Thrust control system suitable for different welding processes

Abstract

The utility model discloses a thrust control system suitable for different welding processes. The thrust control system comprises a voltage input circuit, a gain circuit, a gear switch, a voltage regulating circuit, a thrust output circuit and a thrust control circuit, the output end of the voltage input circuit is connected with the input end of the gain circuit, the output end of the gain circuit is connected with the input end of the voltage regulation circuit after being connected with the gear switch in parallel, and the output end of the voltage regulation circuit is respectively connected with the input end of the thrust control circuit and the input end of the thrust output circuit.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic circuits, in particular to a thrust control system suitable for different welding processes. Background Art

[0002] Most welding equipment on the market only has the thrust (short-circuit current) adjustment function in manual welding mode. When welding cellulose electrodes or using simple argon arc welding, the thrust adjustment and other parameter matching of the product is not very practical, and the output voltage cannot be accurately controlled, thereby reducing the welding effect.

[0003] In the prior art welding equipment, the gear setting is generally limited, such as CC mode and CV mode. In the so-called CC mode (that is, manual welding mode), there are various functions, such as conventional manual welding of MMA electrodes, pipe cellulose downward welding, carbon arc gouging welding, etc. Different welding processes have different requirements for welding voltage. Under conventional MMA electrodes (such as 422 or 507 electrodes), effective continuous welding can be carried out when the welding voltage is greater than 20V. When the welding voltage is lower than 15V, the arc will be broken, resulting in pores or discontinuity in the weld; for cellulose electrodes or carbon rods, the welding voltage needs to be greater than 30V to achieve a better welding effect.

[0004] Therefore, different welding processes require different welding parameters. When the user's technique is unstable and the gap between the electrode and the workpiece fluctuates, the welding voltage will fluctuate. If it is too low, arc segmentation will occur. Therefore, different feedback gains need to be set for different welding processes. When welding MMA, it is necessary to ensure that the welding voltage has a positive gain when it is less than 15V to increase the output current to ensure that arc segmentation does not occur. When welding cellulose, it is necessary to ensure that the welding voltage has a positive gain when it is less than 30V to increase the welding current to ensure that the arc is continuous and not broken. Summary of the invention

[0005] Aiming at the technical problem that the thrust adjustment parameters of welding equipment in the prior art cannot be adjusted according to the welding process, the utility model proposes a thrust control system suitable for different welding processes.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A thrust control system suitable for different welding processes, comprising a voltage input circuit, a gain circuit, a gear switch, a voltage regulating circuit, a thrust output circuit and a thrust control circuit;

[0008] The output end of the voltage input circuit is connected to the input end of the gain circuit, the output end of the gain circuit is connected to the input end of the voltage regulating circuit in parallel with the gear switch, and the output end of the voltage regulating circuit is respectively connected to the input end of the thrust control circuit and the input end of the thrust output circuit.

[0009] Preferably, when the thrust control circuit is turned on, the voltage regulating circuit and the thrust output circuit are not turned on; when the thrust control circuit is not turned on, the voltage regulating circuit and the thrust output circuit are turned on.

[0010] Preferably, the voltage input circuit comprises a first voltage follower:

[0011] The voltage input terminal is connected to one end of the first resistor, and the other end of the first resistor is respectively connected to one end of the second resistor, one end of the first capacitor, the positive electrode of the first diode, and the non-inverting input terminal of the first voltage follower; the other end of the second resistor is grounded, the other end of the first capacitor is grounded, and the cathode of the first diode is connected to the first power supply;

[0012] The negative phase input terminal of the first voltage follower and the output terminal of the first voltage follower are connected in parallel and connected to one end of the third resistor.

[0013] Preferably, the gain circuit comprises a second comparator:

[0014] The other end of the third resistor is respectively connected to one end of the fourth resistor, one end of the fifth resistor, one end of the sixth resistor, and the negative phase input end of the second comparator; the other end of the fifth resistor is connected to the second gear; the other end of the fourth resistor is grounded; the positive phase input end of the second comparator is grounded; the positive voltage end of the second comparator is connected to the second power supply, and the negative voltage end of the second comparator is grounded;

[0015] The output end of the second comparator and the other end of the sixth resistor are connected in parallel to the anode of the second diode.

[0016] Preferably, the voltage regulation circuit comprises a third comparator:

[0017] The cathode of the second diode is connected to one end of the seventh resistor, the other end of the seventh resistor is respectively connected to one end of the eighth resistor, the collector of the first triode, and the non-inverting input end of the third comparator, and the other end of the eighth resistor and the control end of the eighth resistor are connected in parallel and then grounded;

[0018] The negative phase input terminal of the third comparator and the output terminal of the third comparator are connected in parallel and then connected to the thrust output circuit.

[0019] Preferably, the eighth resistor is an adjustable resistor.

[0020] Preferably, the thrust output circuit includes a third power supply:

[0021] The negative phase input terminal of the third comparator and the output terminal of the third comparator are connected in parallel and are respectively connected to the anode of the third diode, the cathode of the fourth diode, one end of the second capacitor and the output terminal; the cathode of the third diode is connected to the third power supply; the anode of the fourth diode is grounded; and the other end of the second capacitor is grounded.

[0022] Preferably, the thrust control circuit comprises a photoelectric coupler:

[0023] The anode of the input end of the photoelectric coupler is grounded; the cathode of the input end of the photoelectric coupler is connected to one end of the eleventh resistor, and the other end of the eleventh resistor is connected to the third gear;

[0024] The collector of the output end of the photoelectric coupler is connected to the fourth power supply, the emitter of the output end of the photoelectric coupler is connected to the anode of the fifth diode, the cathode of the fifth diode is connected to one end of the tenth resistor, the other end of the tenth resistor is respectively connected to one end of the ninth resistor and the base of the first transistor, the other end of the ninth resistor is grounded, and the emitter of the first transistor is grounded.

[0025] In summary, due to the adoption of the above technical solution, compared with the prior art, the utility model has at least the following beneficial effects:

[0026] The utility model adjusts the input voltage according to the selected welding gear (welding process) by setting a gain circuit and a voltage regulating circuit, thereby ensuring the stability of welding, improving the welding effect, ensuring that a positive gain appears when the welding voltage is less than 15V to increase the output current to ensure that no arc segmentation occurs, and ensuring that a positive gain appears when the voltage is less than 30V to increase the welding current when welding cellulose, thereby ensuring that the arc is continuous and not segmented;

[0027] At the same time, a thrust control circuit is set to ensure that when argon arc welding is selected, the thrust will not affect the output current and meet the low voltage requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The figure is a schematic diagram of a thrust control system suitable for different welding processes according to an exemplary embodiment of the present invention.

[0029] Figure 2 The figure is a schematic diagram of specific circuit connection relationship of a thrust control system suitable for different welding processes according to an exemplary embodiment of the utility model. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below in conjunction with the embodiments and specific implementation methods. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0031] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0032] like Figure 1 As shown, the utility model provides a thrust control system suitable for different welding processes, including a voltage input circuit, a gain circuit, a gear switch, a voltage regulating circuit, a thrust output circuit and a thrust control circuit.

[0033] In this embodiment, the output end of the voltage input circuit is connected to the input end of the gain circuit, the output end of the gain circuit is connected to the input end of the voltage regulation circuit in parallel with the gear switch, and the output end of the voltage regulation circuit is respectively connected to the input end of the thrust control circuit and the input end of the thrust output circuit.

[0034] Among them, the gain circuit and the voltage regulation circuit are used to perform positive gain on the thrust when the voltage is lower than the set threshold, thereby increasing the output voltage and ensuring the voltage requirements of different welding processes, thereby improving the stability of welding.

[0035] The thrust control circuit is used to ground the voltage output by the voltage regulating circuit when TIG is selected, so that the voltage cannot affect the output current of the thrust output circuit, meeting the low-voltage working state of TIG (Tungsten Inert Gas).

[0036] like Figure 2 As shown, the voltage input circuit includes a first voltage follower U1:

[0037] The voltage input terminal (V+, i.e., welding output voltage, V- and GND are in common ground) is connected to one end of the first resistor R1, and the other end of the first resistor R1 is respectively connected to one end of the second resistor R2, one end of the first capacitor C1, the positive electrode of the first diode D1, and the non-inverting input terminal of the first voltage follower U1; the other end of the second resistor R2 is grounded, the other end of the first capacitor C1 is grounded, and the cathode of the first diode D1 is connected to the first power supply VCC1;

[0038] The negative phase input terminal of the first voltage follower U1 and the output terminal of the first voltage follower U1 are connected in parallel to one end of the third resistor R3 (ie, the input terminal of the gain circuit).

[0039] In this embodiment, R1 and R2 play the role of voltage divider; D1 plays the role of voltage clamping to ensure the stability of the thrust signal and fix its range.

[0040] like Figure 2 As shown, the gain circuit includes a second comparator U2:

[0041] The other end of the third resistor R3 is respectively connected to one end of the fourth resistor R4, one end of the fifth resistor R5, one end of the sixth resistor R6, and the negative phase input end of the second comparator U2; the other end of the fifth resistor R5 is connected to the second gear 2; the other end of the fourth resistor R4 is connected to the -15V voltage; the positive phase input end of the second comparator U2 is grounded; the positive voltage end of the second comparator U2 is connected to the second power supply VCC2, and the negative voltage end of the second comparator U2 is grounded;

[0042] The output end of the second comparator U2 and the other end of the sixth resistor R6 are connected in parallel to the anode of the second diode D2 (ie, the input end of the voltage regulating circuit).

[0043] The second gear position 2 is connected to -15V through the gear switch S1.

[0044] In this embodiment, the working principle of the gain circuit is:

[0045] The output of the first voltage follower U1, R3, the second gear 2, R5, R4, -15V act together on the inverting input of U2, the non-inverting input of U2 is grounded, and the negative feedback resistor R6, thereby forming an inverting op amp adder circuit;

[0046] Wherein, the voltage V8 at the output end of the first voltage follower U1 = R2*V+ / (R1+R2), where V+ represents the input voltage;

[0047] Then the output voltage U of the adder circuit U2 = -R6 / [(V8 / R3)+(-15 / R4)+(V S2 / R5)],V S2 Indicates the voltage of the second gear 2:

[0048] 1. When the switch is in the first gear position 1, it is in the manual welding position, V S2 =0V, when the output voltage U=0, V+=15V; at this time, 15V is the automatic adjustment 0 point of thrust;

[0049] 2. When the switch is in the second gear position 2, it is in the cellulose position, V S2 =-15V, when the output voltage U=0, V+=30V, at this time 30V is the automatic adjustment 0 point of thrust;

[0050] 3. When the switch is in the third gear position 3, since U4 is turned on, the thrust signal passes through R161, and the voltage signal is connected to the ground through the transistor Q1. No signal is output to the back-end control, so there is no thrust effect when in the argon arc welding position.

[0051] Therefore, in the manual welding gear (first gear 1), since it is an inverting adder, when V+<15V, a positive gain effect will appear and be output to the thrust adjustment circuit through D2;

[0052] In the cellulose gear (second gear 2), since it is an inverting adder, when V+<30V, a positive gain effect will appear, which is output to the thrust adjustment circuit through D2 to ensure the stability of welding when using cellulose welding rods.

[0053] like Figure 2 As shown, the voltage regulation circuit includes a third comparator U3:

[0054] The cathode of the second diode D2 is connected to one end of the seventh resistor R7, the other end of the seventh resistor R7 is respectively connected to one end of the eighth resistor R8 (adjustable resistor, used for thrust adjustment), the collector of the first triode Q1, and the positive phase input end of the third comparator U3, and the other end of the eighth resistor R8 and the control end of the eighth resistor R8 are connected in parallel and then grounded;

[0055] The negative phase input terminal of the third comparator U3 and the output terminal of the third comparator U3 are connected in parallel to the thrust output circuit.

[0056] In this embodiment, the eighth resistor R8 is an adjustable resistor, which is used to adjust the thrust according to different processes and change the voltage and current.

[0057] like Figure 2 As shown, the thrust output circuit includes a third power supply VCC3:

[0058] The negative phase input terminal of the third comparator U3 and the output terminal of the third comparator U3 are connected in parallel and are respectively connected to the anode of the third diode D3, the cathode of the fourth diode D4, one end of the second capacitor C2, and the output terminal (OUT); the cathode of the third diode D3 is connected to the third power supply VCC3; the anode of the fourth diode D4 is grounded; and the other end of the second capacitor C2 is grounded.

[0059] like Figure 2 As shown, the thrust control circuit includes a photocoupler U4:

[0060] The anode of the input end of the photoelectric coupler U4 is grounded; the cathode of the input end of the photoelectric coupler U4 is connected to one end of the eleventh resistor R11, the other end of the eleventh resistor R11 is connected to the third gear 3 (argon arc welding gear) of welding, and the third gear 3 is connected to the -15V voltage through the gear switch S1;

[0061] The collector of the output end of the photoelectric coupler U4 is connected to the fourth power supply VCC4, the emitter of the output end of the photoelectric coupler U4 is connected to the anode of the fifth diode D5, the cathode of the fifth diode D5 is connected to one end of the tenth resistor R10, the other end of the tenth resistor R10 is respectively connected to one end of the ninth resistor R9 and the base of the first transistor Q1, the other end of the ninth resistor R9 is grounded, and the emitter of the first transistor Q1 is grounded.

[0062] In this embodiment, when the gear switch S1 is in the third gear 3 (argon arc welding gear, connected to -15V), since the argon arc welding gear is connected to -15V, U4 is turned on, and the fourth power supply VCC4 is introduced into the base of Q1 through D5, R10, and R9. At this time, Q1 is in a saturated conduction state, and Q1 is in a switch opening function. At this time, the thrust parameter (point pressure signal at the rear end of R7) is connected to the ground through Q1. The voltage feedback signal cannot be transmitted to the rear end through the U3 follower, and cannot affect the output current, which meets the low-voltage working state of TIG (Tungsten Inert Gas) or argon arc welding.

[0063] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present invention, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A thrust control system suitable for different welding processes, characterized in that , including a voltage input circuit, a gain circuit, a gear switch, a voltage regulating circuit, a thrust output circuit and a thrust control circuit; The output end of the voltage input circuit is connected to the input end of the gain circuit, the output end of the gain circuit is connected to the input end of the voltage regulating circuit in parallel with the gear switch, and the output end of the voltage regulating circuit is respectively connected to the input end of the thrust control circuit and the input end of the thrust output circuit.

2. A thrust control system suitable for different welding processes as claimed in claim 1, characterized in that ,When the thrust control circuit is turned on, the voltage regulation circuit and the thrust output circuit are not turned on; when the thrust control circuit is not turned on, the voltage regulation circuit and the thrust output circuit are turned on.

3. A thrust control system suitable for different welding processes as claimed in claim 1, characterized in that , the voltage input circuit includes a first voltage follower: The voltage input terminal is connected to one end of the first resistor, and the other end of the first resistor is respectively connected to one end of the second resistor, one end of the first capacitor, the anode of the first diode, and the non-phase input terminal of the first voltage follower; The other end of the second resistor is grounded, the other end of the first capacitor is grounded, and the cathode of the first diode is connected to the first power supply; The negative phase input terminal of the first voltage follower and the output terminal of the first voltage follower are connected in parallel and connected to one end of the third resistor.

4. A thrust control system suitable for different welding processes as claimed in claim 1, characterized in that , the gain circuit includes a second comparator: The other end of the third resistor is respectively connected to one end of the fourth resistor, one end of the fifth resistor, one end of the sixth resistor, and the negative phase input end of the second comparator; The other end of the fifth resistor is connected to the second gear; the other end of the fourth resistor is grounded; the non-inverting input end of the second comparator is grounded; the positive voltage end of the second comparator is connected to the second power supply, and the negative voltage end of the second comparator is grounded; The output end of the second comparator and the other end of the sixth resistor are connected in parallel to the anode of the second diode.

5. A thrust control system suitable for different welding processes as claimed in claim 1, characterized in that , the voltage regulation circuit includes a third comparator: The cathode of the second diode is connected to one end of the seventh resistor, the other end of the seventh resistor is respectively connected to one end of the eighth resistor, the collector of the first triode, and the non-inverting input end of the third comparator, and the other end of the eighth resistor and the control end of the eighth resistor are connected in parallel and then grounded; The negative phase input terminal of the third comparator and the output terminal of the third comparator are connected in parallel and then connected to the thrust output circuit.

6. A thrust control system suitable for different welding processes as claimed in claim 5, characterized in that , the eighth resistor is an adjustable resistor.

7. A thrust control system suitable for different welding processes as claimed in claim 1, characterized in that , the thrust output circuit includes a third power supply: The negative phase input terminal of the third comparator and the output terminal of the third comparator are connected in parallel and are respectively connected to the anode of the third diode, the cathode of the fourth diode, one end of the second capacitor and the output terminal; the cathode of the third diode is connected to the third power supply; the anode of the fourth diode is grounded; and the other end of the second capacitor is grounded.

8. A thrust control system suitable for different welding processes as claimed in claim 1, characterized in that , the thrust control circuit includes a photoelectric coupler: The anode of the input end of the photoelectric coupler is grounded; the cathode of the input end of the photoelectric coupler is connected to one end of the eleventh resistor, and the other end of the eleventh resistor is connected to the third gear; The collector of the output end of the photoelectric coupler is connected to the fourth power supply, the emitter of the output end of the photoelectric coupler is connected to the anode of the fifth diode, the cathode of the fifth diode is connected to one end of the tenth resistor, the other end of the tenth resistor is respectively connected to one end of the ninth resistor and the base of the first transistor, the other end of the ninth resistor is grounded, and the emitter of the first transistor is grounded.

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