Plasma welding device for sofa frame processing and processing method thereof

Abstract

The present invention relates to the technical field of plasma welding, in particular to a plasma welding device for sofa frame processing and a processing method thereof, comprising a processing table, wherein a positioning mechanism for positioning a frame rod is arranged on the processing table, a welding arm is arranged on the processing table, a plasma welding head is installed at the end of the welding arm, and further comprising: a mounting tube, wherein the mounting tube is sleeved and fixed on the outside of the plasma welding head; and a connecting plate, wherein the connecting plate is fixed on the outer wall of the mounting tube. In the present invention, during the welding process, air is blown by starting a fan, and the weld position can be immediately cooled during the welding process; and during the cooling process, the air outlet tube is pushed to move to a side away from the mounting tube by starting a first electric cylinder, so that the air outlet tube is away from the welding head position, thereby reducing the influence of the overflow gas on the cooling effect of the air outlet tube.

Description

Technical Field

[0001] The invention relates to the field of plasma welding, and in particular to a plasma welding device for processing a sofa frame and a processing method thereof. Background Art

[0002] Plasma welding is a welding method that uses plasma arc as a heat source to melt the joints of two metals. It includes AC plasma arc welding, micro plasma arc welding, reverse polarity plasma arc welding, pulsed plasma arc welding, and consumable plasma arc welding.

[0003] In the prior art, during the plasma welding of certain fine structures or decorative metal parts in a sofa, when the welding positions of the various structures are close, in order to avoid the concentration of welding heat and thermal deformation of the decorative parts, it is often necessary to wait for the previously welded part to cool down before welding the next part, which wastes a lot of time and is not conducive to rapid welding. In addition, the prior art mostly cools the welding position by air cooling. During the plasma welding process, the plasma welding gas will overflow to the surroundings, which has an adverse effect on the air cooling. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a plasma welding device for sofa frame processing and a processing method thereof.

[0005] To achieve the above objectives, in a first aspect, the present invention provides a plasma welding device for processing a sofa frame, comprising a processing table, a positioning mechanism for positioning a frame rod is provided on the processing table, a welding arm is provided on the processing table, a plasma welding head is installed at the end of the welding arm, and further comprising:

[0006] A mounting tube, wherein the mounting tube is sleeved and fixed on the outer side of the plasma welding head;

[0007] A connecting plate, the connecting plate being fixed on the outer wall of the mounting tube;

[0008] An air outlet cylinder, the air outlet cylinder is slidably connected to a connecting plate, a first electric cylinder is fixed to the connecting plate, a movable end of the first electric cylinder is fixed to the air outlet cylinder, a fan is fixed inside the air outlet cylinder, and the fan is used to blow air toward the bottom of the air outlet cylinder;

[0009] A detection component, the detection component is arranged on the mounting tube, and the detection component is used to detect the size of the airflow overflowing from the welding position to the air outlet tube;

[0010] A controller, the controller is used to adjust the position of the air outlet according to the size of the air flow;

[0011] Specifically, during the welding process, by starting the fan to blow air, the weld position can be immediately cooled during the welding process;

[0012] And in the cooling process, the size of the airflow overflowing from the welding position is detected by the detection component, wherein the detection component can use a gas flow rate sensor, the gas flow rate sensor is fixed on the mounting tube, and the size of the overflowing airflow is detected by the gas flow rate sensor. When the overflowing airflow reaches the set value, it means that the cooling effect of the air outlet cylinder will be affected. At this time, the air outlet cylinder is pushed to the side away from the mounting tube by starting the first electric cylinder, so that the air outlet cylinder is away from the welding head position, thereby reducing the impact of the overflowing gas on the cooling effect of the air outlet cylinder.

[0013] Preferably, an airflow guiding assembly is provided inside the air outlet, and the airflow guiding assembly includes:

[0014] A plurality of guide plates, each of which is fixed inside the air outlet cylinder, and a ventilation channel is formed between the plurality of guide plates. A sealing plate is fixed to the top of the guide plates, and a plurality of air inlet cylinders are fixed to the surface of the sealing plate. The bottom of the air inlet cylinder passes through the sealing plate and is connected to the ventilation channel, and the top of the air inlet cylinder is fixedly connected to the air outlet of the fan through a pipeline;

[0015] A ventilation mesh plate, wherein the ventilation mesh plate is fixed to the bottom of the guide plate;

[0016] Specifically, for heat-resistant steel, stainless steel and some high-alloy materials, these materials are relatively less sensitive to cooling rate, and direct air cooling will not significantly increase the risk of cold cracks, but will help to form the desired microstructure. Therefore, direct air cooling is often used to cool the welding position;

[0017] Some materials are relatively sensitive to cooling rate and require the cooling gas to be dispersed before blowing cooling. Therefore, the present invention provides a guide plate to guide and disperse the airflow blown out by the fan, and provides a ventilation mesh plate to further disperse the airflow to the welding position for cooling, thereby avoiding situations that affect the welding effect.

[0018] Preferably, a jet assembly is provided on the side wall of the air outlet, and the jet assembly comprises:

[0019] An installation box, the installation box is installed on the side wall of the air outlet cylinder, and an air pump is fixed on the top of the installation box;

[0020] A spray box, the spray box is fixed at the bottom of the installation box, two bidirectional jet areas and one unidirectional jet area are arranged on the spray box, the unidirectional jet area is arranged between the two bidirectional jet areas, the unidirectional jet area is installed with a jet pipe, the top of the jet pipe is connected to the installation box, the end of the jet pipe passes through the side wall of the spray box, a plurality of three-way pipes are equidistantly installed on the bidirectional jet area, the three-way pipe has a top end, a bottom end, and a horizontal end, the top end of the three-way pipe is connected to the installation box, and the bottom end, the horizontal end and the inside of the jet pipe of the three-way pipe are all installed with solenoid valves;

[0021] The controller is also used to control the electromagnetic valve in the horizontal end of the three-way pipe and the electromagnetic valve in the jet pipe to open, and control the electromagnetic valve in the bottom end of the three-way pipe to close when the overflow airflow is less than a set value;

[0022] When the overflow airflow is greater than a set value, the solenoid valve in the bottom end of the three-way pipe is controlled to open, and the solenoid valve in the horizontal end is controlled to close;

[0023] Specifically, when the welding trajectory is a straight line, the effect of the overflow gas on cooling can be reduced by pushing the air outlet tube away from the welding head;

[0024] Since the air outlet moves synchronously with the welding head, when the welding trajectory is curved or irregular, if the air outlet is far away from the welding head, the cooling position will be offset, affecting the cooling effect;

[0025] Therefore, the present invention sets a spray box. When it is detected that the overflow airflow reaches a set value, the air pump is started to transport gas to the inside of the installation box. The gas enters from the top of the three-way pipe and the air injection pipe and is ejected from the opened electromagnetic valve position. The electromagnetic valves in the bottom ends of the three-way pipes on both sides of the welding area are controlled by a controller to open and the electromagnetic valves in the horizontal ends are closed, so that the gas can be ejected vertically downward on both sides of the welding position to prevent the overflow gas from entering.

[0026] In order to avoid the influence of vertical downward gas spraying on the welding effect, a one-way air-jet area is set above the welding position, so that the spray box above the welding position always sprays horizontally, while the two sides of the welding position spray vertically, thereby reducing the space for external gas to enter;

[0027] When it is detected that the overflow gas has not reached the set value, the solenoid valves located on the bottom of the spray box are in a closed state, and the solenoid valve at the horizontal end of the three-way pipe is in an open state, so that the spray box can spray horizontally, and the spray direction is horizontal to the welding position. The airflow at the welding position is accelerated by horizontal blowing, thereby accelerating the cooling rate of the welding position, and the airflow direction is not directly facing the welding position, which can avoid adverse effects on the welding position.

[0028] In a second aspect, the present invention provides a sofa frame processing method, the processing method comprising the following steps:

[0029] Clamp the frame rod on the processing table and start the welding arm to weld;

[0030] The controller acquires gas flow rate information, and the gas flow rate information is generated by the detection component detecting the flow rate of the air flow overflowing from the welding position to the air outlet direction;

[0031] The controller compares the gas flow rate information with a preset value;

[0032] When the gas flow rate information reaches a preset value and the welding trajectory is a straight line, the controller generates first control information, and the first control information is used to control the extension of the first electric cylinder;

[0033] The controller sends the first control information to the first electric cylinder;

[0034] When the gas flow rate information reaches a preset value, but the welding trajectory is not a straight line, the controller generates second control information and third control information, wherein the second control information is used to control the start of the gas pump, and the third control information is used to control the electromagnetic valve in the bottom end of the three-way pipe to open and the electromagnetic valve in the horizontal end to close;

[0035] The controller sends the second control information to the air pump;

[0036] The controller sends the third control information to the solenoid valve in the three-way pipeline.

[0037] Preferably, the processing method further comprises the following steps:

[0038] The controller acquires gas flow direction information, and the gas flow direction sensor detects the generation of gas flow direction below the one-way jet area;

[0039] When the gas flows toward the inside of the air outlet and the surface of the welding component is flat, the controller generates fourth control information according to the gas flow information, and the fourth control information is used to control the start of the second electric cylinder;

[0040] The controller sends fourth control information to the second electric cylinder;

[0041] When the gas flows toward the inside of the air outlet and the surface of the welding part is uneven, the controller generates fifth control information according to the gas flow information, and the fifth control information is used to control the start of the motor;

[0042] The controller sends fifth control information to the motor.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] 1. During the welding process, the fan is started to blow air. During the welding process, the weld position can be cooled immediately. During the cooling process, the size of the airflow overflowing from the welding position is detected by the detection component. The detection component can use a gas flow rate sensor. The gas flow rate sensor is fixed on the mounting tube. The size of the overflow airflow is detected by the gas flow rate sensor. When the overflow airflow reaches the set value, it means that the cooling effect of the air outlet tube is affected. At this time, the first electric cylinder is started to push the air outlet tube to the side away from the mounting tube, so that the air outlet tube is away from the welding head position, thereby reducing the impact of the overflow gas on the cooling effect of the air outlet tube.

[0045] Second, some materials are relatively sensitive to cooling rate and require the cooling gas to be dispersed before blowing cooling. Therefore, the present invention provides a guide plate to guide and disperse the airflow blown out by the fan, and provides a ventilation mesh plate to further disperse the airflow to the welding position for cooling, thereby avoiding situations that affect the welding effect.

[0046] 3. Since the air outlet moves synchronously with the welding head, when the welding trajectory is curved or irregular, if the air outlet is far away from the welding head, the cooling position will be offset, affecting the cooling effect. Therefore, the present invention sets a spray box. When it is detected that the overflow airflow reaches the set value, the air pump is started to transport gas to the inside of the installation box. The gas enters from the top of the three-way pipe and the injection pipe, and is ejected from the open solenoid valve position. The solenoid valve in the bottom end of the three-way pipe on both sides of the welding area is controlled by a controller to open, and the solenoid valve in the horizontal end is closed, so that the gas can be ejected vertically downward on both sides of the welding position to prevent the overflow gas from entering. In order to avoid the influence of the vertically downward ejected gas on the welding effect, a one-way injection area is set directly above the welding position, so that the spray box directly above the welding position always performs horizontal injection, while the two sides of the welding position perform vertical injection, thereby reducing the space for external gas to enter. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0048] Figure 2 It is a schematic diagram of the structure of the welding arm and the plasma welding head of the present invention.

[0049] Figure 3 For the present invention Figure 2 A in the figure is an enlarged structural diagram.

[0050] Figure 4 It is a schematic diagram of the cross-sectional structure of the air outlet tube of the present invention.

[0051] Figure 5 For the present invention Figure 4 The enlarged structural diagram at B in FIG.

[0052] Figure 6 It is a schematic diagram of the structure of the air outlet tube of the present invention.

[0053] Figure 7 It is a schematic diagram of the structure of the jet pipe and the three-way pipeline of the present invention.

[0054] Figure 8 The processing method of the present invention is as follows Figure 1 .

[0055] Fig. 9 The processing method of the present invention is as follows Figure 2 .

[0056] In the figure: 1. processing table; 2. frame rod; 3. welding arm; 4. plasma welding head; 5. mounting tube; 6. connecting plate; 7. air outlet tube; 8. first electric cylinder; 9. fan; 10. guide plate; 11. ventilation channel; 12. sealing plate; 13. air inlet tube; 14. ventilation mesh plate; 15. mounting box; 16. air pump; 17. spray box; 18. jet pipe; 19. three-way pipe; 20. gas flow direction sensor; 21. second electric cylinder; 22. flip plate; 23. air outlet slot; 24. motor; 25. third electric cylinder; 26. clamping plate; 27. solenoid valve; 28. gas flow rate sensor. DETAILED DESCRIPTION

[0057] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0058] like Figures 1 to 7 A plasma welding device for processing a sofa frame is shown, comprising a processing table 1, on which a positioning mechanism for positioning a frame rod 2 is provided, a welding arm 3 is provided on the processing table 1, and a plasma welding head 4 is installed at the end of the welding arm 3, and further comprising:

[0059] The mounting tube 5 is sleeved and fixed on the outer side of the plasma welding head 4;

[0060] A connecting plate 6, the connecting plate 6 is fixed on the outer wall of the mounting tube 5;

[0061] The air outlet cylinder 7 is slidably connected to the connecting plate 6, a first electric cylinder 8 is fixed to the connecting plate 6, a movable end of the first electric cylinder 8 is fixed to the air outlet cylinder 7, a fan 9 is fixed inside the air outlet cylinder 7, and the fan 9 is used to blow air to the bottom of the air outlet cylinder 7;

[0062] A detection component is arranged on the mounting tube 5 and is used to detect the size of the airflow overflowing from the welding position to the air outlet tube 7;

[0063] A controller, which is used to adjust the position of the air outlet 7 according to the size of the air flow;

[0064] Specifically, in the prior art, during the plasma welding of certain fine structures or decorative metal parts in a sofa, when the welding positions of the various structures are close, in order to avoid the concentration of welding heat and thermal deformation of the decorative parts, it is often necessary to wait for the previously welded part to cool before welding the next part, which wastes a lot of time and is not conducive to rapid welding. In addition, the prior art mostly cools the welding position by air cooling. During the plasma welding process, the plasma welding gas will overflow to the surroundings, which has an adverse effect on the air cooling. The present invention can solve the above problems, and the specific working method is as follows;

[0065] During the welding process, the blower 9 is started to blow air, and the weld position can be immediately cooled during the welding process;

[0066] And the welding arm 3 moves on the surface of the processing table 1 under the driving action of the linear screw drive assembly;

[0067] And in the cooling process, the size of the airflow overflowing from the welding position is detected by the detection component, wherein the detection component can use a gas flow rate sensor 28, and the gas flow rate sensor 28 is fixed on the mounting tube 5. The size of the overflowing airflow is detected by the gas flow rate sensor 28. When the overflowing airflow reaches the set value, it means that the cooling effect of the air outlet tube 7 will be affected. At this time, the air outlet tube 7 is pushed to the side away from the mounting tube 5 by starting the first electric cylinder 8, so that the air outlet tube 7 is away from the welding head position, thereby reducing the impact of the overflowing gas on the cooling effect of the air outlet tube 7.

[0068] As a further embodiment of the present invention, an airflow guide assembly is provided inside the air outlet 7, and the airflow guide assembly includes:

[0069] A plurality of guide plates 10 are fixed inside the air outlet 7, a ventilation channel 11 is formed between the plurality of guide plates 10, a sealing plate 12 is fixed to the top of the guide plates 10, a plurality of air inlet cylinders 13 are fixed to the surface of the sealing plate 12, the bottom of the air inlet cylinder 13 penetrates the sealing plate 12 and is connected to the ventilation channel 11, and the top of the air inlet cylinder 13 is fixedly connected to the air outlet of the fan 9 through a pipeline;

[0070] A ventilation mesh plate 14, the ventilation mesh plate 14 is fixed to the bottom of the guide plate 10;

[0071] Specifically, for heat-resistant steel, stainless steel and some high-alloy materials, these materials are relatively less sensitive to cooling rate, and direct air cooling will not significantly increase the risk of cold cracks, but will help to form the desired microstructure. Therefore, direct air cooling is often used to cool the welding position;

[0072] Some materials are relatively sensitive to the cooling rate and need to disperse the cooling gas before blowing cooling. Therefore, the present invention provides a guide plate 10 to guide and disperse the airflow blown out by the fan 9, and provides a ventilation mesh plate 14 to further disperse the airflow to the welding position for cooling, thereby avoiding situations that affect the welding effect.

[0073] In the above embodiment, after the airflow is dispersed, although the influence on the welding position can be reduced, the dispersed cooling airflow is easily disturbed by the external airflow, affecting the uniformity of cooling. In particular, when the air cooling position is close to the welding position, during the welding process, the overflowed gas directly impacts the dispersed cooling airflow, which is easy to have an adverse effect on the cooling effect. In view of this, the present invention proposes a further embodiment, in which a jet assembly is provided on the side wall of the air outlet 7, and the jet assembly includes:

[0074] An installation box 15 is installed on the side wall of the air outlet cylinder 7, and an air pump 16 is fixed on the top of the installation box 15;

[0075] Spray box 17, spray box 17 is fixed at the bottom of installation box 15, two bidirectional jet areas and one unidirectional jet area are arranged on spray box 17, the unidirectional jet area is arranged between the two bidirectional jet areas, a jet pipe 18 is installed in the unidirectional jet area, the top of the jet pipe 18 is connected with installation box 15, the end of the jet pipe 18 passes through the side wall of spray box 17, a plurality of three-way pipes 19 are installed at equal intervals on the bidirectional jet area, the three-way pipe 19 has a top end, a bottom end and a horizontal end, the top end of the three-way pipe 19 is connected with installation box 15, and the bottom end, the horizontal end and the inside of the jet pipe 18 are all installed with electromagnetic valves 27;

[0076] The controller is also used to control the electromagnetic valve 27 in the horizontal end of the three-way pipe 19 and the electromagnetic valve 27 in the jet pipe 18 to open, and control the electromagnetic valve 27 in the bottom end of the three-way pipe 19 to close when the overflow airflow is less than a set value;

[0077] When the overflow airflow is greater than the set value, the solenoid valve 27 in the bottom end of the three-way pipe 19 is controlled to open, and the solenoid valve 27 in the horizontal end is closed;

[0078] Specifically, when the welding trajectory is a straight line, the effect of the overflow gas on cooling can be reduced by pushing the air outlet tube 7 away from the welding head;

[0079] Since the air outlet 7 moves synchronously with the welding head, when the welding trajectory is curved or irregular, if the air outlet 7 is far away from the welding head, the cooling position will be offset, affecting the cooling effect;

[0080] Therefore, the present invention sets a spray box 17. When it is detected that the overflow airflow reaches a set value, the air pump 16 is started. The air pump 16 delivers gas to the inside of the installation box 15. The gas enters from the top of the three-way pipe 19 and the air injection pipe 18, and is ejected from the position of the opened electromagnetic valve 27. The electromagnetic valve 27 in the bottom end of the three-way pipe 19 on both sides of the welding area is opened by the controller, and the electromagnetic valve 27 in the horizontal end is closed, so that the gas can be ejected vertically downward on both sides of the welding position to prevent the overflow gas from entering;

[0081] In order to avoid the influence of gas spraying vertically downward on the welding effect, a one-way air-jet area is set just above the welding position, so that the spray box 17 just above the welding position always sprays horizontally, while the two sides of the welding position spray vertically, thereby reducing the space for external gas to enter;

[0082] When it is detected that the overflow gas has not reached the set value, the solenoid valves 27 located on the bottom surface of the spray box 17 are in a closed state, and the solenoid valves 27 at the horizontal end of the three-way pipe 19 are in an open state, so that the spray box 17 sprays horizontally, and the spray direction is horizontal to the welding position. The airflow at the welding position is accelerated by horizontal blowing, thereby accelerating the cooling rate of the welding position, and the airflow direction is not directly facing the welding position, which can avoid adverse effects on the welding position.

[0083] As a further embodiment of the present invention, a gas flow direction sensor 20 is installed on the bottom surface of the spray box 17 located in the one-way jet area, and the gas flow direction sensor 20 is used to detect the gas flow direction below the one-way jet area;

[0084] Specifically, by blowing air vertically on both sides of the welding position to form an air curtain, although it can reduce the impact of external gas on the cooling gas in the air outlet 7, there is still an entry space at the bottom of the one-way jet area. Therefore, the present invention sets a gas flow direction sensor 20 to detect the gas flow direction below the one-way jet area. When it is detected that the airflow flows toward the inside of the air outlet 7, it means that the external gas is flowing toward the inside of the air outlet 7. At this time, subsequent measures can be taken. When it is detected that the airflow flows to the outside of the air outlet 7, it means that the external gas is difficult to flow into the inside of the air outlet 7, and no measures are needed.

[0085] As a further embodiment of the present invention, the installation box 15 is slidably connected to the side wall of the air outlet cylinder 7, a second electric cylinder 21 is fixed to the side wall of the air outlet cylinder 7, and a movable end of the second electric cylinder 21 is fixed to the installation box 15;

[0086] Specifically, when the surface of the welding part is relatively flat, the second electric cylinder 21 can be started to drive the installation box 15 and the spray box 17 to move downward as a whole, thereby reducing the gap between the one-way jet area and the welding position, thereby further reducing the entry of external gas.

[0087] However, when the surface of the welding part is uneven, the above embodiment needs to constantly adjust the position of the spray box 17, which is cumbersome to operate. In view of this, the present invention proposes a further embodiment, in which a shielding assembly is provided on the upper side of the ventilation mesh plate 14 near the mounting box 15, and the shielding assembly includes a flip plate 22, which is rotatably connected to the inner wall of the air outlet cylinder 7, and an air outlet slot 23 is provided in the middle of the flip plate 22. A motor 24 is fixed on the side wall of the air outlet cylinder 7, and the output shaft of the motor 24 is coaxially fixed with the rotating shaft of the flip plate 22;

[0088] Specifically, the present invention blocks the ventilated mesh plate 14 by setting a flip plate 22, so that the air outlet position is more concentrated and close to the one-way jet area, which is beneficial to prevent external air from entering and affecting the internal cooling gas.

[0089] As a further embodiment of the present invention, the positioning mechanism includes a third electric cylinder 25, the third electric cylinder 25 is fixed on the processing table 1, and a clamping plate 26 is fixed to the movable end of the third electric cylinder 25;

[0090] Specifically, the workpiece can be clamped by starting the third electric cylinder 25 to push the clamping plate 26 .

[0091] like Figure 8 , Fig. 9 A sofa frame processing method is shown, and the processing method comprises the following steps:

[0092] Clamp the frame rod 2 on the processing table 1 and start the welding arm 3 to perform welding;

[0093] The controller obtains the gas flow rate information, which is generated by the detection component detecting the flow rate of the air flow overflowing from the welding position to the air outlet 7;

[0094] The controller compares the gas flow rate information with the preset value;

[0095] When the gas flow rate information reaches a preset value and the welding trajectory is a straight line, the controller generates first control information, and the first control information is used to control the extension of the first electric cylinder 8;

[0096] The controller sends the first control information to the first electric cylinder 8;

[0097] When the gas flow rate information reaches the preset value, but the welding trajectory is not a straight line, the controller generates second control information and third control information, the second control information is used to control the air pump 16 to start, and the third control information is used to control the electromagnetic valve 27 in the bottom end of the three-way pipe 19 to open and the electromagnetic valve 27 in the horizontal end to close;

[0098] The controller sends the second control information to the air pump 16;

[0099] The controller sends the third control information to the solenoid valve 27 in the three-way pipe 19 .

[0100] As a further embodiment of the present invention, the processing method further comprises the following steps:

[0101] The controller obtains the gas flow direction information, and the gas flow direction sensor 20 detects the gas flow direction generation below the one-way jet area;

[0102] When the gas flows toward the inside of the air outlet 7 and the surface of the welding part is flat, the controller generates fourth control information according to the gas flow information, and the fourth control information is used to control the start of the second electric cylinder 21;

[0103] The controller sends the fourth control information to the second electric cylinder 21;

[0104] When the gas flows toward the inside of the air outlet 7 and the surface of the welding part is uneven, the controller generates fifth control information according to the gas flow information, and the fifth control information is used to control the motor 24 to start;

[0105] The controller sends the fifth control information to the motor 24 .

[0106] As a further embodiment of the present invention, the specific working mode of the detection component includes the following steps:

[0107] The detection component obtains the flow rate of the air flow overflowing from the welding position to the air outlet 7;

[0108] The detection component generates gas flow rate information according to the gas flow rate;

[0109] The detection component sends the gas flow rate information to the controller.

[0110] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention, and these changes and improvements fall within the scope of the present invention claimed.

Claims

1. A plasma welding device for processing a sofa frame, comprising a processing table (1), wherein the processing table (1) is provided with a positioning mechanism for positioning a frame rod (2), the processing table (1) is provided with a welding arm (3), and a plasma welding head (4) is installed at the end of the welding arm (3), characterized in that: Also includes: A mounting tube (5), wherein the mounting tube (5) is sleeved and fixed on the outside of the plasma welding head (4); A connecting plate (6), wherein the connecting plate (6) is fixed on the outer wall of the mounting tube (5); An air outlet cylinder (7), the air outlet cylinder (7) being slidably connected to a connecting plate (6), a first electric cylinder (8) being fixed to the connecting plate (6), a movable end of the first electric cylinder (8) being fixed to the air outlet cylinder (7), a fan (9) being fixed inside the air outlet cylinder (7), the fan (9) being used for blowing air toward the bottom of the air outlet cylinder (7); A detection component, the detection component being arranged on the mounting tube (5), and the detection component being used to detect the size of the airflow overflowing from the welding position toward the air outlet tube (7); A controller, the controller being used to adjust the position of the air outlet cylinder (7) according to the size of the air flow; An airflow guiding component is arranged inside the air outlet cylinder (7), and the airflow guiding component comprises: A plurality of guide plates (10), the plurality of guide plates (10) are all fixed inside the air outlet tube (7), a ventilation channel (11) is formed between the plurality of guide plates (10), a sealing plate (12) is fixed to the top of the guide plates (10), a plurality of air inlet tubes (13) are fixed to the surface of the sealing plate (12), the bottom of the air inlet tube (13) passes through the sealing plate (12) and is connected to the ventilation channel (11), and the top of the air inlet tube (13) is fixedly connected to the air outlet of the fan (9) through a pipeline; A ventilation mesh plate (14), wherein the ventilation mesh plate (14) is fixed to the bottom of the guide plate (10); An air jet assembly is arranged on the side wall of the air outlet cylinder (7), and the air jet assembly comprises: An installation box (15), the installation box (15) being installed on a side wall of the air outlet cylinder (7), and an air pump (16) being fixed on the top of the installation box (15); A spray box (17), wherein the spray box (17) is fixed to the bottom of the installation box (15), and the spray box (17) is provided with two bidirectional jet areas and one unidirectional jet area, wherein the unidirectional jet area is provided between the two bidirectional jet areas, and the unidirectional jet area is provided with a jet pipe (18), wherein the top of the jet pipe (18) is connected to the installation box (15), and the end of the jet pipe (18) penetrates the side wall of the spray box (17), and a plurality of three-way pipes (19) are equidistantly provided on the bidirectional jet area, wherein the three-way pipe (19) has a top end, a bottom end, and a horizontal end, wherein the top end of the three-way pipe (19) is connected to the installation box (15), and the bottom end, the horizontal end, and the inside of the jet pipe (18) are provided with electromagnetic valves (27); The controller is also used to control the electromagnetic valve (27) in the horizontal end of the three-way pipe (19) and the electromagnetic valve (27) in the jet pipe (18) to open, and control the electromagnetic valve (27) in the bottom end of the three-way pipe (19) to close when the overflow airflow is less than a set value; When the overflow airflow is greater than a set value, the solenoid valve (27) in the bottom end of the three-way pipe (19) is controlled to open, and the solenoid valve (27) in the horizontal end is controlled to close.

2. The plasma welding device for sofa frame processing according to claim 1, characterized in that: A gas flow direction sensor (20) is installed on the bottom surface of the spray box (17) located in the one-way jet area, and the gas flow direction sensor (20) is used to detect the gas flow direction below the one-way jet area.

3. The plasma welding device for sofa frame processing according to claim 2, characterized in that: The installation box (15) is slidably connected to the side wall of the air outlet cylinder (7), a second electric cylinder (21) is fixed to the side wall of the air outlet cylinder (7), and a movable end of the second electric cylinder (21) is fixed to the installation box (15).

4. The plasma welding device for sofa frame processing according to claim 3, characterized in that: A shielding assembly is provided above the ventilation mesh plate (14) on one side close to the installation box (15), and the shielding assembly comprises a flip plate (22). The flip plate (22) is rotatably connected to the inner wall of the air outlet tube (7), and an air outlet slot (23) is provided in the middle of the flip plate (22). A motor (24) is fixed to the side wall of the air outlet tube (7), and the output shaft of the motor (24) is coaxially fixed to the rotation shaft of the flip plate (22).

5. The plasma welding device for sofa frame processing according to claim 4, characterized in that: The positioning mechanism comprises a third electric cylinder (25), the third electric cylinder (25) is fixed on the processing table (1), and a clamping plate (26) is fixed to the movable end of the third electric cylinder (25).

6. A sofa frame processing method, applicable to the sofa frame processing plasma welding device according to claim 5, characterized in that: The processing method comprises the following steps: Clamp the frame rod (2) on the processing table (1), and start the welding arm (3) to perform welding; The controller acquires gas flow rate information, wherein the gas flow rate information is generated by the detection component detecting the flow rate of the air flow overflowing from the welding position toward the air outlet tube (7); The controller compares the gas flow rate information with a preset value; When the gas flow rate information reaches a preset value and the welding trajectory is a straight line, the controller generates first control information, wherein the first control information is used to control the extension of the first electric cylinder (8); The controller sends the first control information to the first electric cylinder (8); When the gas flow rate information reaches a preset value but the welding trajectory is not a straight line, the controller generates second control information and third control information, wherein the second control information is used to control the start of the air pump (16), and the third control information is used to control the electromagnetic valve (27) in the bottom end of the three-way pipe (19) to open and the electromagnetic valve (27) in the horizontal end to close; The controller sends the second control information to the air pump (16); The controller sends the third control information to the solenoid valve (27) in the three-way pipeline (19).

7. A sofa frame processing method according to claim 6, characterized in that: The processing method also includes the following steps: The controller acquires gas flow direction information, and the gas flow direction sensor (20) detects the generation of gas flow direction below the one-way jet area; When the gas flows toward the inside of the air outlet tube (7) and the surface of the welding component is flat, the controller generates fourth control information according to the gas flow information, and the fourth control information is used to control the start of the second electric cylinder (21); The controller sends fourth control information to the second electric cylinder (21); When the gas flows toward the inside of the air outlet tube (7) and the surface of the welding part is uneven, the controller generates fifth control information according to the gas flow information, and the fifth control information is used to control the motor (24) to start; The controller sends fifth control information to the motor (24).

8. A sofa frame processing method according to claim 6, characterized in that: The specific working method of the detection component includes the following steps: The detection component obtains the flow rate of the airflow overflowing from the welding position toward the air outlet tube (7); The detection component generates gas flow rate information according to the gas flow rate; The detection component sends the gas flow rate information to the controller.

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