Welding device

Abstract

The utility model discloses a welding device, and relates to the technical field of welding devices. The welding device comprises a fuel gas control unit, a protective gas control unit and an electric control unit. The fuel gas control unit includes: a fuel gas flow path; the fuel gas supply device is connected with one end of the fuel gas flow channel; the first valve is arranged on the fuel gas flow channel, and one end of the first valve is connected with the fuel gas supply device; and the first flow meter is arranged on the fuel gas flow channel and is connected with the other end of the fuel gas flow channel. The protective gas control unit comprises a protective gas flow channel; the protective gas supply device is connected with one end of the protective gas flow channel; the second valve is arranged on the protective gas flow channel, and one end of the second valve is connected with the protective gas supply device. And the electric control unit is electrically connected with the first valve, the first flow meter and the second valve. The welding device can automatically control circulation of protective gas.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of welding devices, in particular to a welding device. BACKGROUND

[0002] In the semiconductor industry, acetylene is usually used as fuel and nitrogen is used as protective gas in the process of brazing copper pipes. Nitrogen protection can prevent copper pipes from oxidation, carbonization and cracking. The semiconductor industry requires high precision in temperature control, high airtightness in copper pipe welding and high quality in welding.

[0003] At present, brazing copper pipes is usually completed by manual operation. The operation process is that an operator manually opens the valve of a nitrogen cylinder, manually opens the valve of an acetylene cylinder and ignites to debug.

[0004] However, the applicant finds that in the current operation process, the operator may forget to open the valve of the nitrogen cylinder, which may cause damage to the welded copper pipe. For example, the welded copper pipe may have unobvious welding damage (such as carbonization cracks, etc.), and the welding damage may be found at the node using the damaged copper pipe. Even during equipment debugging, the problem of the damaged copper pipe leaving the factory cannot be found. CONTENT OF THE INVENTION

[0005] The present application provides a welding device, which aims to solve the problem that the operator does not open the nitrogen protection before operating the welding machine.

[0006] According to an aspect of the present application, a welding device is provided. The welding device includes a fuel gas control unit, a shielding gas control unit, and an electric control unit. The fuel gas control unit includes a fuel gas flow channel, a fuel gas supply device, a first valve, and a first flowmeter. The fuel gas supply device is connected to one end of the fuel gas flow channel. The first valve is disposed on the fuel gas flow channel, and one end of the first valve is connected to the fuel gas supply device. The first flowmeter is disposed on the fuel gas flow channel, and is disposed on the gas outlet side of the first valve. The shielding gas control unit includes a shielding gas flow channel, a second valve, and a shielding gas supply device. The shielding gas supply device is connected to one end of the shielding gas flow channel. The second valve is disposed on the shielding gas flow channel, and one end of the second valve is connected to the shielding gas supply device. The electric control unit includes a main power distribution module, a first switch, a first relay, and a second relay. The main power distribution module is connected to a power distribution line at an input end, converts a first voltage of the power distribution line into a second voltage, and outputs the second voltage at an output end. One end of the first switch is electrically connected to the positive pole of the output end of the main power distribution module, and the other end of the first switch is electrically connected to one end of the first valve. The first relay includes a first coil and a first normally open switch. One end of the first coil is electrically connected to a first end of the first flowmeter, and the other end of the first coil is electrically connected to the negative pole of the output end of the main power distribution module. One end of the first normally open switch is electrically connected to the positive pole of the output end of the main power distribution module. The second relay includes a second coil and a second normally open switch. One end of the second coil is electrically connected to the other end of the first normally open switch, and the other end of the second coil is electrically connected to the negative pole of the output end of the main power distribution module. One end of the second normally open switch is electrically connected to the positive pole of the output end of the main power distribution module, and the other end of the second normally open switch is electrically connected to one end of the second valve. The other end of the first valve is electrically connected to the negative pole of the output end of the main power distribution module. A second end of the first flowmeter is electrically connected to the positive pole of the output end of the main power distribution module, and a third end of the first flowmeter is electrically connected to the negative pole of the output end of the main power distribution module. The other end of the second valve is electrically connected to the negative pole of the output end of the main power distribution module.

[0007] According to some embodiments of the present application, the protection gas control unit further comprises a second flow meter. The second flow meter is disposed on the protection gas flow channel and on the gas outlet side of the second valve, one end of the second flow meter is electrically connected to the positive pole of the output end of the main power distribution module. The welding device further comprises a safety unit. The safety unit comprises a third relay, a fourth relay, a fifth relay and a sixth relay. The third relay comprises a third coil and a third normally closed sensing switch, one end of the third coil is electrically connected to the negative pole of the output end of the main power distribution module, and one end of the third normally closed sensing switch is electrically connected to the positive pole of the output end of the main power distribution module. The fourth relay comprises a fourth coil and a fourth normally open sensing switch, one end of the fourth normally open sensing switch is electrically connected to the other end of the second valve, the other end of the fourth normally open sensing switch is electrically connected to the other end of the third coil, and one end of the fourth coil is electrically connected to the other end of the second flow meter. The fifth relay comprises a fifth coil and a fifth normally closed sensing switch, one end of the fifth coil is electrically connected to the other end of the fourth coil, the other end of the fifth coil is electrically connected to the negative pole of the output end of the main power distribution module, and one end of the fifth normally closed sensing switch is electrically connected to the positive pole of the output end of the main power distribution module. The sixth relay comprises a sixth coil and a sixth normally closed sensing switch, one end of the sixth coil is electrically connected to the other end of the third normally closed sensing switch and one end of the fifth normally closed sensing switch, and the other end of the sixth coil is electrically connected to the negative pole of the output end of the main power distribution module, one end of the third normally closed sensing switch is electrically connected to the other end of the first switch, and the other end of the third normally closed sensing switch is electrically connected to one end of the first valve.

[0008] According to some embodiments of the present application, the fourth relay further comprises a fourth normally closed sensing switch, one end of the fourth normally closed sensing switch is electrically connected to the positive pole of the output end of the main power distribution module. The welding device further comprises an alarm unit. The alarm unit comprises a first alarm module. One end of the first alarm module is electrically connected to the other end of the fourth normally closed sensing switch, and one end of the first alarm module is electrically connected to the other end of the third normally closed sensing switch, and the other end of the first alarm module is electrically connected to the negative pole of the output end of the main power distribution module.

[0009] According to some embodiments of the present application, the electrical control unit further comprises a second alarm module. One end of the second alarm module is electrically connected to the other end of the first valve, and the other end is electrically connected to the negative pole of the output end of the main power distribution module.

[0010] According to some embodiments of the present application, the electrical control unit further comprises a delay relay. The first end of the delay relay is connected to one end of the first normally open sensing switch, the second end is connected to one end of the second coil, the third end is electrically connected to the positive pole of the output end of the main power distribution module, and the fourth end is electrically connected to the negative pole of the output end of the main power distribution module.

[0011] According to some embodiments of the present application, the main power distribution module comprises a main power distribution switch and a power supply. One end of the main power distribution switch is connected with the power distribution line; the other end of the main power distribution switch is electrically connected with the input end of the power supply, and receives the first voltage; the power supply converts the first voltage into the second voltage, and the output end of the power supply outputs the second voltage.

[0012] According to some embodiments of the present application, the fuel gas supply device is an acetylene cylinder.

[0013] According to some embodiments of the present application, the protective gas supply device is a nitrogen cylinder.

[0014] According to some embodiments of the present application, the other end of the fuel gas flow channel is connected with a fuel gas outlet, and the other end of the protective gas flow channel is connected with a protective gas outlet.

[0015] According to some embodiments of the present application, the welding device as described above can be a copper tube brazing welding device.

[0016] Advantages:

[0017] The present application detects the fuel gas flow in the fuel gas flow channel by the first flow meter, and automatically controls the second valve by the electric control unit according to the detection result, so that the second valve is automatically opened when the fuel gas flow detected by the first flow meter reaches the preset range of fuel gas flow, and the protective gas flows into the protective gas flow channel. The present application can automatically flow the protective gas into the protective gas flow channel after the welding device is powered on, so as to provide the protective gas for the welding device. The present application can avoid the situation that the protective gas is not opened during welding, thereby ensuring the welding quality of the welding part. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0019] Figure 1 Fig. 1 shows a structural schematic diagram of a welding device according to an embodiment of the present application;

[0020] Figure 2 Fig. 2 shows another structural schematic diagram of a welding device according to an embodiment of the present application;

[0021] Figure 3 Fig. 3 shows a schematic diagram of an electric control unit according to an embodiment of the present application;

[0022] Figure 4Fig. 1 shows a schematic diagram of a safety unit and an alarm unit according to an embodiment of the present application;

[0023] Figure 5 Fig. 2 shows a schematic diagram of a main distribution module according to an embodiment of the present application.

[0024] Reference signs:

[0025] Welding device 100.

[0026] Fuel gas control unit 1; shielding gas control unit 2; electric control unit 3; safety unit 4; alarm unit 5.

[0027] Fuel gas flow path 11; fuel gas supply device 12; first valve 13; first flow meter 14; welding torch 15.

[0028] Shielding gas flow path 21; shielding gas supply device 22; second valve 23; second flow meter 24; spray gun 25.

[0029] Main distribution module 31; first switch 32; first relay 33; second relay 34; second alarm module 35; time delay relay 36.

[0030] Third relay 41; fourth relay 42; fifth relay 43; sixth relay 44.

[0031] First alarm module 51.

[0032] Main distribution switch 311; power supply 312; plug 313.

[0033] First coil 331; first inductive normally open switch 332.

[0034] Second coil 341; second inductive normally open switch 342.

[0035] Third coil 411; third inductive normally closed switch 412.

[0036] Fourth coil 421; fourth inductive normally open switch 422; fourth inductive normally closed switch 423.

[0037] Fifth coil 431; fifth inductive normally closed switch 432.

[0038] Sixth coil 441; sixth inductive normally closed switch 442. DETAILED DESCRIPTION

[0039] Example embodiments now will be described more fully hereinafter with reference to the accompanying drawings; however, the example embodiments can be implemented in any number of ways not expressly illustrated herein. The embodiments described herein are not limiting, and should not be construed as preferred embodiments. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the example embodiments to those skilled in the art. Like reference numerals refer to like elements throughout.

[0040] The described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the

[0041] Moreover, the terms "first," "second," and the like, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another.

[0042] The terms "first," "second," and the like, used in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the descriptive terms "first," "second," etc., are to be interpreted, by those skilled in the art, as a structural or functional pertinence.

[0043] The technical solutions in the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0044] According to an aspect of the present application, a welding device 100 is provided. Referring to Figures 1-3 , the welding device 100 includes a fuel gas control unit 1, a shielding gas control unit 2, and an electric control unit 3.

[0045] According to an example embodiment, referring to Figure 1 , the fuel gas control unit 1 includes a fuel gas flow passage 11, a fuel gas supply device 12, a first valve 13, and a first flow meter 14.

[0046] The fuel gas supply device 12 is connected with one end of the fuel gas flow passage 11 to supply fuel gas to the fuel gas flow passage 11.

[0047] The first valve 13 is provided on the fuel gas flow passage 11, and one end of the first valve 13 is connected with the fuel gas supply device 12. The first valve 13 controls the opening and closing of the fuel gas supply device 12 to control the inflow of fuel gas into the fuel gas flow passage 11.

[0048] The first flowmeter 14 is provided on the fuel gas flow passage 11, and is provided on the gas outlet side of the first valve 13. The first flowmeter 14 detects the flow rate of fuel gas in the fuel gas flow passage 11.

[0049] According to an example embodiment, referring to Figure 1 , the shielding gas control unit 2 includes a shielding gas flow passage 21, a second valve 23, and a shielding gas supply device 22.

[0050] The shielding gas supply device 22 is connected with one end of the shielding gas flow passage 21 to supply shielding gas to the shielding gas flow passage 21.

[0051] The second valve 23 is provided on the shielding gas flow passage 21, and one end of the second valve 23 is connected with the shielding gas supply device 22. The second valve 23 controls the opening and closing of the shielding gas supply device 22 to control the inflow of shielding gas into the shielding gas flow passage 21.

[0052] According to an example embodiment, the electric control unit 3 can be provided in an electric cabinet of the welding device 100. Referring to Figure 3 and Figure 5 , the electric control unit 3 includes a main distribution module 31, a first switch 32, a first relay 33, and a second relay 34.

[0053] Referring to Figure 5 , the input end of the main distribution module 31 is connected with a power distribution line to convert a first voltage output by the power distribution line into a second voltage, and the output end outputs the second voltage.

[0054] According to an example embodiment, the first voltage can be an alternating voltage output by the power distribution line, and is usually alternating 220V or alternating 380V. The second voltage can be a direct voltage suitable for the operation of the first switch 32, the first relay 33, the second relay 34, the first valve 13, the first flowmeter 14, and the second valve 23.

[0055] One end of the first switch 32 is connected with the positive pole of the output end of the main distribution module 31, and the other end of the first switch 32 is connected with one end of the first valve 13. After receiving the second voltage output by the positive pole of the output end of the main distribution module 31, the first switch 32 is turned on.

[0056] Referring to Figure 3The first relay 33 includes a first coil 331 and a first inductive normally open switch 332. One end of the first coil 331 is electrically connected to the first end of the first flowmeter 14, and the other end of the first coil 331 is electrically connected to the negative pole of the output end of the main distribution module 31. One end of the first inductive normally open switch 332 is electrically connected to the positive pole of the output end of the main distribution module 31.

[0057] Exemplarily, the first inductive normally open switch 332 can be a normally open contact of the first relay 33.

[0058] The second relay 34 includes a second coil 341 and a second inductive normally open switch 342. One end of the second coil 341 is connected to the other end of the first inductive normally open switch 332, and the other end of the second coil 341 is connected to the negative pole of the output end of the main distribution module 31. One end of the second inductive normally open switch 342 is connected to the positive pole of the output end of the main distribution module 31, and the other end of the second inductive normally open switch 342 is electrically connected to one end of the second valve 23.

[0059] Exemplarily, the second inductive normally open switch 342 can be a normally open contact of the second relay 34.

[0060] The other end of the first valve 13 is electrically connected to the negative pole of the output end of the main distribution module 31. The second end of the first flowmeter 14 is electrically connected to the positive pole of the output end of the main distribution module 31, and the third end of the first flowmeter 14 is electrically connected to the negative pole of the output end of the main distribution module 31. The other end of the second valve 23 is connected to the negative pole of the output end of the main distribution module 31.

[0061] According to the example embodiment, referring to Figure 3 After the first switch 32 is turned on, the first valve 13 is opened, and the fuel gas flows into the fuel gas flow channel 11. After the first flowmeter 14 detects that the flow of the fuel gas in the fuel gas flow channel 11 reaches the preset range of the fuel gas flow, the first end of the first flowmeter 14 outputs a high-level voltage (about 24V), so that the first coil 331 is powered on. After the first coil 331 is powered on, the first inductive normally open switch 332 is turned on, so that the second coil 341 is powered on. After the second coil 341 is powered on, the second inductive normally open switch 342 is turned on. After the second inductive normally open switch 342 is turned on, the second valve 23 is opened, and the protective gas flows into the protective gas flow channel 21.

[0062] The preset range of the fuel gas flow can be a range of the flow of the fuel gas in the fuel gas flow channel 11 corresponding to the high-level output of the first end of the first flowmeter. The preset range of the fuel gas flow can be actually set according to the user's demand, which is not limited in the present application.

[0063] When the first flowmeter 14 detects that the flow of fuel gas in the fuel gas flow channel 11 does not reach the preset range of fuel gas flow, the first end of the first flowmeter 14 outputs a low voltage (about 0V) to stop the power supply of the first coil 331.

[0064] Through the above embodiment, the present application detects the flow of fuel gas in the fuel gas flow channel 11 by arranging the first flowmeter 14 in the fuel gas flow channel 11. According to the detection result, the automatic electrical control of the second valve 23 is realized through the electrical control unit 3, so that the second valve 23 can be automatically opened when the first flowmeter 14 detects that the flow of fuel gas reaches the preset range of fuel gas flow, so that the protective gas flows into the protective gas flow channel 21. The present application can realize that the protective gas automatically flows into the protective gas flow channel 21 after the welding device 100 is powered on, so as to provide the protective gas for the welding device 100.

[0065] The scheme of the present application can automatically flow the protective gas into the protective gas flow channel 21 after the welding device 100 is powered on, which can avoid the situation that the protective gas is not opened during welding, so as to ensure the welding quality of the welding part.

[0066] Optionally, referring to Figure 1 and Figure 3 , the protective gas control unit 2 further comprises a second flowmeter 24. The second flowmeter 24 is arranged on the protective gas flow channel 21 and on the gas outlet side of the second valve 23. The second flowmeter 24 detects the flow of protective gas in the protective gas flow channel 21. One end of the second flowmeter 24 is electrically connected to the positive electrode of the output end of the main power distribution module 31.

[0067] Referring to Figure 3 and Figure 4 , the welding device 100 further comprises a safety unit 4. The safety unit 4 comprises a third relay 41, a fourth relay 42, a fifth relay 43 and a sixth relay 44.

[0068] Referring to Figure 3 and Figure 4 , the third relay 41 comprises a third coil 411 and a third inductive normally closed switch 412. One end of the third coil 411 is electrically connected to the negative electrode of the output end of the main power distribution module 31, and one end of the third inductive normally closed switch 412 is electrically connected to the positive electrode of the output end of the main power distribution module 31.

[0069] Exemplarily, the third inductive normally closed switch 412 can be a normally closed contact of the third relay 41.

[0070] Referring to Figure 3 and Figure 4The fourth relay 42 includes a fourth coil 421 and a fourth inductive normally open switch 422. One end of the fourth inductive normally open switch 422 is electrically connected to the other end of the second valve 23, and the other end of the fourth inductive normally open switch 422 is electrically connected to the other end of the third coil 411. One end of the fourth coil 421 is electrically connected to the other end of the second flow meter 24.

[0071] Exemplarily, the fourth inductive normally open switch 422 can be a normally open contact of the fourth relay 42.

[0072] Referring to Figure 3 and Figure 4 The fifth relay 43 includes a fifth coil 431 and a fifth inductive normally closed switch 432. One end of the fifth coil 431 is electrically connected to the other end of the fourth coil 421, and the other end of the fifth coil 431 is electrically connected to the negative pole of the output end of the main distribution module 31. One end of the fifth inductive normally closed switch 432 is electrically connected to the positive pole of the output end of the main distribution module 31,

[0073] Exemplarily, the fifth inductive normally closed switch 432 can be a normally closed contact of the fifth relay 43.

[0074] Referring to Figure 3 and Figure 4 The sixth relay 44 includes a sixth coil 441 and a sixth inductive normally closed switch 442. One end of the sixth coil 441 is electrically connected to the other end of the third inductive normally closed switch 412, and one end of the sixth coil 441 is electrically connected to the other end of the fifth inductive normally closed switch 432. The other end of the sixth coil 441 is electrically connected to the negative pole of the output end of the main distribution module 31. One end of the third inductive normally closed switch 412 is electrically connected to the other end of the first switch 32, and the other end of the third inductive normally closed switch 412 is electrically connected to one end of the first valve 13.

[0075] Exemplarily, the sixth inductive normally closed switch 442 can be a normally closed contact of the sixth relay 44.

[0076] According to an example embodiment, referring to Figure 3 and Figure 4, the second flowmeter 24 outputs a high voltage (about 24V) to make the fourth coil 421 and the fifth coil 431 electrified. After the fourth coil 421 is electrified, the fourth inductive normally open switch 422 is turned on. After the fifth coil 431 is electrified, the fifth inductive normally closed switch 432 is turned off. After the fourth inductive normally open switch 422 is turned on, the third coil 411 is electrified. After the third coil 411 is electrified, the third inductive normally closed switch 412 is turned off. In the case that the fifth inductive normally closed switch 432 is turned off and the third inductive normally closed switch 412 is turned off, the sixth coil 441 is not electrified, the sixth inductive normally closed switch 442 is turned on, and the first valve 13 is normally opened.

[0077] The preset range of the flow rate of the protective gas can be a range of the flow rate of the protective gas in the protective gas flow channel 21 corresponding to the high level output by the second flowmeter 24. The preset range of the flow rate of the protective gas can be set according to the user's demand, which is not limited in the present application.

[0078] According to the example embodiment, referring to Figure 3 and Figure 4 In the case that the second flowmeter 24 detects that the flow rate of the protective gas in the protective gas flow channel 21 does not reach the preset range of the flow rate of the protective gas, the second flowmeter 24 outputs a low voltage (about 0V) to make the fourth coil 421 and the fifth coil 431 stop being electrified. After the fourth coil 421 stops being electrified, the fourth inductive normally open switch 422 is turned off. After the fifth coil 431 stops being electrified, the fifth inductive normally closed switch 432 is turned on. After the fourth inductive normally open switch 422 is turned off, the third coil 411 stops being electrified. After the third coil 411 stops being electrified, the third inductive normally closed switch 412 is turned on. In the case that the third inductive normally closed switch 412 is turned on or the fifth inductive normally closed switch 432 is turned on, the sixth coil 441 is electrified, the sixth inductive normally closed switch 442 is turned off, the first valve 13 is closed, and the fuel gas stops flowing into the fuel gas flow channel 11.

[0079] According to the example embodiment, in the case that the second valve 23 is damaged, the fourth inductive normally open switch 422 is turned off, and the third coil 411 stops being electrified. After the third coil 411 stops being electrified, the third inductive normally closed switch 412 is turned on. In the case that the third inductive normally closed switch 412 is turned on, the sixth coil 441 is electrified, the sixth inductive normally closed switch 442 is turned off, the first valve 13 is closed, and the fuel gas stops flowing into the fuel gas flow channel 11.

[0080] In the case that the third relay 41 is damaged or fails to function, the third coil 411 stops being powered, the third inductive normally closed switch 412 is turned on, the sixth coil 441 is powered, the sixth inductive normally closed switch 442 is turned off, the first valve 13 is closed, and the fuel gas stops flowing into the fuel gas flow channel 11.

[0081] In the case that the fourth relay 42 is damaged or fails to function, the fourth coil 421 stops being powered, the fourth inductive normally open switch 422 is turned off, the third coil 411 stops being powered, the third inductive normally closed switch 412 is turned on. The sixth coil 441 is powered, the sixth inductive normally closed switch 442 is turned off, the first valve 13 is closed, and the fuel gas stops flowing into the fuel gas flow channel 11.

[0082] In the case that the fourth relay 42 is damaged or fails to function, the fifth coil 431 stops being powered, the fifth inductive normally closed switch 432 is turned on. The sixth coil 441 is powered, the sixth inductive normally closed switch 442 is turned off, the first valve 13 is closed, and the fuel gas stops flowing into the fuel gas flow channel 11.

[0083] Through the above embodiment, the second flow meter 24 detects the protective gas in the protective gas flow channel 21, and in the case that the flow of the protective gas does not reach the preset range of the protective gas flow, the safety unit 4 controls the first valve 13 to be closed, the fuel gas stops flowing into the fuel gas flow channel 11, and the welding process is stopped. The safety unit 4 also controls the first valve 13, and in the case that the second valve 23 is damaged, the fuel gas stops flowing into the fuel gas flow channel 11.

[0084] The application can automatically stop the fuel gas from flowing into the fuel gas flow channel 11 in the case that the flow of the protective gas does not reach the preset range of the protective gas flow or the second valve 23 is damaged, thereby avoiding the situation that the protective gas is not used in the welding process, and ensuring the welding quality.

[0085] Optionally, referring to Figure 4 , the fourth relay 42 further comprises a fourth inductive normally closed switch 423, one end of the fourth inductive normally closed switch 423 being electrically connected to the positive pole of the output end of the main power distribution module 31.

[0086] Exemplarily, the fourth inductive normally closed switch 423 can be a normally closed contact of the fourth relay 42.

[0087] Referring to Figure 4 , the welding device 100 further comprises an alarm unit. The alarm unit comprises a first alarm module 51.

[0088] One end of the first alarm module 51 is electrically connected with the other end of the fourth inductive normally closed switch 423, and one end of the first alarm module 51 is electrically connected with the other end of the third inductive normally closed switch 412, and the other end of the first alarm module 51 is electrically connected with the negative pole of the output end of the main power distribution module 31.

[0089] Exemplarily, the first alarm module 51 can be a buzzer.

[0090] According to the example embodiment, in the case that the second flowmeter 24 detects that the flow of the shielding gas in the shielding gas flow channel 21 does not reach the shielding gas flow preset range (i.e., the first valve 13 is normally opened), the fourth coil 421 is powered, the fourth coil 421 is powered, the fourth inductive normally closed switch 423 is then opened. The third inductive normally closed switch 412 is also opened, and the first alarm module 51 does not start the alarm.

[0091] According to the example embodiment, in the case that the second flowmeter 24 detects that the flow of the shielding gas in the shielding gas flow channel 21 does not reach the shielding gas flow preset range, the fourth coil 421 stops being powered, the fourth inductive normally closed switch 423 is then turned on, the buzzer (the first alarm module 51) emits sound and flashes light.

[0092] In the case that the second valve 23 is damaged, after the third coil 411 stops being powered, the third inductive normally closed switch 412 is turned on, the buzzer (the first alarm module 51) emits sound and flashes light.

[0093] The present application alarms through the first alarm module 51. In the case that the shielding gas flow does not reach the shielding gas flow preset range or the second valve 23 is damaged, the fuel gas flow into the fuel gas flow channel 11 is automatically stopped, and at the same time, the first alarm module 51 is triggered to work, thereby alarming the operator to stop the welding work.

[0094] Optionally, referring to Figure 3 , the electric control unit 3 further comprises a second alarm module 35. One end of the second alarm module 35 is electrically connected with the other end of the first valve 13, and the other end of the second alarm module 35 is electrically connected with the negative pole of the output end of the main power distribution module 31.

[0095] Exemplarily, the second alarm module 35 can be a power-on indicator.

[0096] In the case that the first valve 13 is opened and the fuel gas flows into the fuel gas flow channel 11, the power-on indicator (the second alarm module 35) is lighted, thereby reminding the operator that the fuel gas starts to flow into the fuel gas flow channel 11.

[0097] Optionally, referring to Figure 3 , the electric control unit 3 further comprises a time delay relay 36.

[0098] The first end of the time delay relay 36 is connected with one end of the first inductive normally open switch 332, the second end of the time delay relay 36 is connected with one end of the second coil 341, the third end of the time delay relay 36 is connected with the positive pole of the output end of the main distribution module 31, and the fourth end of the time delay relay 36 is connected with the negative pole of the output end of the main distribution module 31.

[0099] According to the example embodiment, after the welding operation is completed, the first switch 32 is turned off. Then the first end of the first flowmeter 14 outputs a low level, the first coil 331 stops being powered, and the first inductive normally open switch 332 is turned off. In the case that the first inductive normally open switch 332 is turned off, the second end of the time delay relay 36 can output a high level voltage, so that the second coil 341 continues to be powered, thereby causing the second valve 23 to be opened for a preset time, and the shielding gas continues to flow into the shielding gas flow channel 21.

[0100] According to the example embodiment, the preset time is the time for which the second valve 23 is opened after the first switch 32 is turned off. The preset time can be 2 minutes to 8 minutes. The preset time is related to the ambient temperature. In the case that the ambient temperature is low (for example, the ambient temperature is 15℃), the preset time can be 2 minutes. The preset time can be actually set according to the user's demand, which is not limited in the present application.

[0101] The shielding gas continues to flow into the shielding gas flow channel 21 for the preset time, which can not only reduce the temperature of the welding part, but also improve the welding quality of the welding part.

[0102] Optionally, referring to Figure 5 The main distribution module 31 includes a main distribution switch 311 and a power supply 312.

[0103] According to the example embodiment, one end of the main distribution switch 311 can be electrically connected with the power distribution circuit through a plug 313.

[0104] Exemplarily, the plug 313 can be a three-phase plug 313.

[0105] The input end of the power supply 312 is electrically connected with the other end of the main distribution switch 311, and receives the first voltage. The power supply 312 converts the first voltage into a second voltage. The output end of the power supply 312 outputs the second voltage.

[0106] For example, the main distribution switch 311 can be a miniature circuit breaker, and the power supply 312 can be a switching power supply 312. When the miniature circuit breaker is turned on, the switching power supply 312 converts the alternating current 380V voltage of the power distribution circuit into a direct current 24V voltage.

[0107] Exemplarily, the first switch 32 can be an auxiliary contact of the main distribution switch 311 (miniature circuit breaker). When the main miniature circuit breaker is on, the first switch 32 is automatically on, so that the second valve 23 is automatically opened, and the protection gas flows into the protection gas flow channel 21.

[0108] Optionally, referring to Figure 1 and Figure 2 , the fuel gas supply device 12 can be an acetylene cylinder. The protection gas supply device 22 can be a nitrogen cylinder.

[0109] The fuel gas supply device 12 can also be an external acetylene pipeline. The protection gas supply device 22 can also be an external nitrogen pipeline.

[0110] Optionally, referring to Figure 1 and Figure 2 , the other end of the fuel gas flow channel 11 is connected to a fuel gas outlet, and the fuel gas connection outlet can be connected to a welding torch 15. The other end of the protection gas flow channel 21 is connected to a protection gas outlet, and the protection gas outlet can be connected to a spray gun 25.

[0111] Optionally, the welding device 100 as described above can be a copper pipe brazing welding device 100, which can be used for copper pipe brazing welding of refrigeration systems, refrigeration equipment, etc.

[0112] Finally, it should be noted that the above only describes the preferred embodiments of the present application and is not intended to limit the present application. Although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions of the foregoing embodiments or make equivalent replacements to some technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A welding device, characterized in that, The welding device comprises a fuel gas control unit, a shielding gas control unit and an electric control unit; The fuel gas control unit comprises: a fuel gas flow channel; a fuel gas supply device connected to one end of the fuel gas flow channel; a first valve arranged on the fuel gas flow channel, one end of the first valve being connected to the fuel gas supply device; a first flow meter arranged on the fuel gas flow channel and on the gas outlet side of the first valve; The shielding gas control unit comprises: a shielding gas flow channel; a shielding gas supply device connected to one end of the shielding gas flow channel; a second valve arranged on the shielding gas flow channel, one end of the second valve being connected to the shielding gas supply device; The electric control unit comprises: a main power distribution module having an input end connected to a power distribution line, converting a first voltage of the power distribution line into a second voltage, and an output end outputting the second voltage; a first switch having one end electrically connected to the positive pole of the output end of the main power distribution module, and the other end electrically connected to one end of the first valve; a first relay comprising a first coil and a first inductive normally open switch, one end of the first coil being electrically connected to the first end of the first flow meter, the other end of the first coil being electrically connected to the negative pole of the output end of the main power distribution module, and one end of the first inductive normally open switch being electrically connected to the positive pole of the output end of the main power distribution module; a second relay comprising a second coil and a second inductive normally open switch, one end of the second coil being electrically connected to the other end of the first inductive normally open switch, the other end of the second coil being electrically connected to the negative pole of the output end of the main power distribution module, one end of the second inductive normally open switch being electrically connected to the positive pole of the output end of the main power distribution module, and the other end of the second inductive normally open switch being electrically connected to one end of the second valve; the other end of the first valve being electrically connected to the negative pole of the output end of the main power distribution module; the second end of the first flow meter being electrically connected to the positive pole of the output end of the main power distribution module, and the third end of the first flow meter being electrically connected to the negative pole of the output end of the main power distribution module; the other end of the second valve being electrically connected to the negative pole of the output end of the main power distribution module.

2. The welding device of claim 1, wherein The shielding gas control unit further comprises: a second flow meter arranged on the shielding gas flow channel and on the gas outlet side of the second valve, one end of the second flow meter being electrically connected to the positive pole of the output end of the main power distribution module; The welding device further comprises: a safety unit comprising: a third relay comprising a third coil and a third inductive normally closed switch, one end of the third coil being electrically connected to the negative pole of the output end of the main power distribution module, and one end of the third inductive normally closed switch being electrically connected to the positive pole of the output end of the main power distribution module; a fourth relay comprising a fourth coil and a fourth inductive normally open switch, one end of the fourth inductive normally open switch being electrically connected to the other end of the second valve, the other end of the fourth inductive normally open switch being electrically connected to the other end of the third coil, and one end of the fourth coil being electrically connected to the other end of the second flow meter; The fifth relay includes a fifth coil and a fifth normally closed switch, one end of the fifth coil is electrically connected with the other end of the fourth coil, the other end of the fifth coil is electrically connected with the negative pole of the output end of the main distribution module, one end of the fifth normally closed switch is electrically connected with the positive pole of the output end of the main distribution module; The sixth relay includes a sixth coil and a sixth normally closed switch, one end of the sixth coil is electrically connected with the other end of the third normally closed switch, and one end of the sixth coil is electrically connected with the other end of the fifth normally closed switch, the other end of the sixth coil is electrically connected with the negative pole of the output end of the main distribution module, one end of the third normally closed switch is electrically connected with the other end of the first switch, and the other end of the third normally closed switch is electrically connected with one end of the first valve.

3. The welding device of claim 2, wherein, The fourth relay further includes a fourth normally closed switch, one end of the fourth normally closed switch is electrically connected with the positive pole of the output end of the main distribution module; The welding device further includes an alarm unit, which includes: A first alarm module, one end of the first alarm module is electrically connected with the other end of the fourth normally closed switch, and one end of the first alarm module is electrically connected with the other end of the third normally closed switch, the other end of the first alarm module is electrically connected with the negative pole of the output end of the main distribution module.

4. The welding device of claim 3, wherein, The electric control unit further includes: A second alarm module, one end of the second alarm module is electrically connected with the other end of the first valve, and the other end of the second alarm module is electrically connected with the negative pole of the output end of the main distribution module.

5. The welding device of claim 1, wherein, The electric control unit further includes: A delay relay, a first end of the delay relay is connected with one end of the first normally open switch, a second end of the delay relay is connected with one end of the second coil, a third end of the delay relay is electrically connected with the positive pole of the output end of the main distribution module, and a fourth end of the delay relay is electrically connected with the negative pole of the output end of the main distribution module.

6. The welding device of claim 1, wherein, The main distribution module includes: A main distribution switch, one end of the main distribution switch is connected with the power distribution line; A power supply, an input end of the power supply is electrically connected with the other end of the main distribution switch, receives the first voltage, converts the first voltage into the second voltage, and outputs the second voltage through an output end.

7. The welding device of claim 1, wherein, The fuel gas supply device is an acetylene gas cylinder.

8. The welding device of claim 1, wherein, The protective gas supply device is a nitrogen gas cylinder.

9. The welding device of claim 1, wherein, The other end of the fuel gas flow channel is connected with a fuel gas outlet, and the other end of the protective gas flow channel is connected with a protective gas outlet.

10. The welding device according to any of claims 1-9, characterized in that The welding device is a copper pipe brazing welding device.

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