Medium-frequency large-current welding equipment for metal handle

Abstract

The utility model discloses a medium frequency heavy current welding equipment for the metal handle, including welding module, control module and transformer, welding module includes welding fixed seat, welding movable seat, conductive copper seat, welding electrode and down-pressing module, conductive copper seat is provided welding movable seat top, welding electrode is fixed on conductive copper seat, and the down-pressing module is fixed on the welding movable seat. The welding movable seat is rotationally arranged on the welding fixed seat, the pressing module is arranged above the welding electrode, the input end of the input rectification module is connected with a power frequency alternating current power grid, and the output end of the input rectification module is electrically connected with the input ends of the first IGBT inversion module and the second IGBT inversion module; the output end of the first IGBT inversion module and the output end of the second IGBT inversion module are electrically connected with the input end of the transformer, and the welding electrode is electrically connected with the output end of the transformer for welding. The effect of single-face paint breaking welding is more attractive, medium-frequency direct-current low-voltage large current is output for welding, the welding process tends to be stable, fusion performance is good, splashing is avoided, welding spots are attractive, and consistency is good.

Description

Technical Field

[0001] The utility model relates to the technical field of welding equipment, in particular to medium-frequency and high-current welding equipment for metal handles. Background Art

[0002] At present, the common method for welding lids and handles in China is power frequency welding, and spot welding is performed directly after the workpieces are paired. This welding method not only consumes a lot of energy, but can only weld one point at a time, resulting in low production efficiency and poor weld quality. Domestic advanced welding machines also use medium frequency, but the welding pressurization uses compressed gas to provide power and the action is completed through the cylinder. This type of welding requires the purchase of equipment that produces compressed gas, which increases production costs and poor welding quality.

[0003] Pneumatic pressure power frequency welding will lead to uncontrollable welding quality, resulting in high noise and large spatter during welding. At the same time, due to the use of two-phase power supply, it has a great impact on the power grid and will generate various harmonics, reducing the power supply quality of the power grid. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a medium-frequency and high-current welding device for metal handles.

[0005] To achieve the above-mentioned purpose, the utility model discloses a medium-frequency and high-current welding equipment for metal handles, including a welding module, a control module and a transformer. The welding module includes a welding fixed seat, a welding movable seat, a pair of conductive copper seats, a pair of welding electrodes and a pressing module. The pair of conductive copper seats are arranged at intervals on the top of the welding movable seat, and the pair of welding electrodes are fixedly arranged on the pair of conductive copper seats respectively. A hollow position for accommodating a handle is formed between the pair of welding electrodes. The welding movable seat is rotatably arranged on the welding fixed seat, and the pressing module is arranged above the welding electrode. The welding movable seat is driven by a rotating drive device to rotate in a plane.

[0006] The control module includes a comprehensive processing module, an input rectifier module, a first IGBT inverter module and a second IGBT inverter module, the input end of the input rectifier module is connected to the industrial frequency AC power grid, and the output end thereof is electrically connected to the input ends of the first IGBT inverter module and the second IGBT inverter module, the output ends of the first IGBT inverter module and the second IGBT inverter module are electrically connected to the input end of the transformer, and the welding electrode is electrically connected to the output end of the transformer through a soft copper busbar for welding;

[0007] The input rectifier module is electrically connected to the integrated processing module to monitor its working data, and the control ends of the first IGBT inverter module and the second IGBT inverter module are respectively electrically connected to the integrated processing module to control the magnitude of their output currents.

[0008] Furthermore, a connecting column is fixedly provided at the bottom of the welding movable seat, and a through hole for the connecting column to pass through is provided on the welding fixed seat, and the connecting column is rotatably provided in the through hole.

[0009] Furthermore, the rotary drive device includes a driving cylinder and a movable arm, one end of the movable arm is fixedly connected to the bottom end of the connecting column, and the other end of the movable arm is hinged to the movable part of the driving cylinder.

[0010] Furthermore, the outer contour of the conductive copper seat is in the shape of a "7", the horizontal section of the conductive copper seat is tightly connected to the top of the welding fixing seat, the welding electrode is fixedly arranged on the top of the horizontal section of the conductive copper seat, and the vertical section of the conductive copper seat is connected to the output end of the transformer through a soft copper busbar.

[0011] Furthermore, the downward pressure module includes a downward pressure lifting drive device, a downward pressure accommodating seat and a pair of insulating pressure blocks. The downward pressure lifting drive device is used to drive the downward pressure accommodating seat to be lifted and lowered above the hollow position. A pair of insulating pressure blocks are fixedly arranged at the bottom of the downward pressure accommodating seat at intervals, and are respectively opposite to a pair of welding electrodes up and down.

[0012] Furthermore, a filter capacitor is connected in parallel between the first IGBT inverter module and the second IGBT inverter module.

[0013] Furthermore, the control module also includes a chassis, the input rectifier module, the first IGBT inverter module and the second IGBT inverter module are arranged in sequence in the chassis, and the comprehensive processing module is fixedly arranged above the first IGBT inverter module and the second IGBT inverter module.

[0014] A plurality of connecting columns are vertically arranged in the chassis, and the connecting columns are arranged in a rectangular array. The integrated processing module is fixedly connected to the connecting columns by bolts.

[0015] Furthermore, a connection window is provided on one side of the chassis, and a first output copper busbar and a second output copper busbar are fixedly provided on both sides of the chassis respectively, the first output copper busbar and the second output copper busbar are symmetrically arranged, and one end thereof respectively extends outside the connection window.

[0016] Furthermore, the input rectifier module, the first IGBT inverter module, and the second IGBT inverter module are sequentially arranged between the first output copper busbar and the second output copper busbar along the width direction of the chassis starting from the connection window.

[0017] The output ends of the first IGBT inverter module and the second IGBT inverter module are connected to the first output copper busbar and the second output copper busbar respectively through copper busbars.

[0018] Furthermore, a primary current sensor is provided on the first output copper busbar, and the primary current sensor is electrically connected to the comprehensive processing module. The current input to the transformer is monitored by the comprehensive processing module to regulate and control the first IGBT inverter module and the second IGBT inverter module.

[0019] A secondary current sensor is provided on the output end of the transformer, and the secondary current sensor is electrically connected to the comprehensive processing module. The current input to the welding electrode from the transformer is monitored through the comprehensive processing module.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. The single-sided paint-breaking welding makes the welding effect more beautiful and the work more stable.

[0022] 2. The three-phase power supply is balanced input, and its high power factor can save energy and reduce consumption, which can reduce power supply power and infrastructure electrical investment. The symmetrical three-phase primary load does not pollute the power grid, does not require compensation and filtering equipment, and outputs medium-frequency DC low-voltage and high current for welding, making the welding process stable, with good fusion, no spatter, beautiful welds, and good consistency, thereby improving the welding quality in mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a front view schematic diagram of the overall structure of this embodiment;

[0024] Figure 2 is a three-dimensional schematic diagram of the welding module of this embodiment;

[0025] Figure 3 This is a schematic diagram of the connection state of the welding movable seat and the welding fixed seat in this embodiment;

[0026] Figure 4 This is a top view of the control module of this embodiment when it is arranged in the chassis;

[0027] Figure 5 Schematic diagram of the electrical principle of the comprehensive processing module of this embodiment. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the utility model clearer, the following will be combined with Figure 1-Figure 5 The utility model is further described in detail with reference to the accompanying drawings.

[0029] Reference Figure 1 As shown, a medium-frequency high-current welding device for metal handles includes a welding module 1, a control module 2 and a transformer 3, wherein the control module 2 and the transformer 3 are respectively arranged on the outside of the welding module 1.

[0030] The overall structure and function of the transformer 3 of this embodiment are consistent with a medium frequency DC water-cooled welding transformer 3 of Chinese patent announcement number "CN206619469U", which will not be elaborated here.

[0031] Reference Figure 1 , Figure 2 As shown, the welding module 1 includes a welding fixed seat 11, a welding movable seat 12, a pair of conductive copper seats 13, a pair of welding electrodes 14, a rotation drive device 15 and a pressing module 16. The welding movable seat 12 is rotatably arranged on the welding fixed seat 11, the pair of conductive copper seats 13 are symmetrically fixedly arranged on the top of the welding movable seat 12, the pair of welding electrodes 14 are respectively fixedly arranged on the top of the pair of conductive copper seats 13, the pressing module 16 is movably arranged above the welding electrodes 14, and the rotation drive device 15 is fixedly arranged on the outer side of the welding fixed seat 11, and the welding movable seat 12 is driven by the rotation drive device 15 to perform a plane rotation on the welding fixed seat 11.

[0032] Recombination Figure 3 As shown, a connecting column 121 is fixedly arranged at the bottom of the welding movable seat 12, and a through hole for the connecting column 121 to pass through is arranged on the welding fixed seat 11, and the connecting column 121 is inserted into the through hole. The outer periphery of the connecting column 121 is rotatably connected to the inner periphery of the through hole through a bearing.

[0033] The rotation drive device 15 includes a driving cylinder 151 and a movable arm 152. The driving cylinder 151 is fixedly arranged on the outer side of the welding fixing seat 11. One end of the movable arm 152 is fixedly connected to the bottom of the connecting column 121. The other end of the movable arm 152 passes through the welding fixing seat 11 and is hinged to the movable part of the driving cylinder 151. The welding fixing seat 11 is provided with an avoidance opening for the movable arm 152 to pass through.

[0034] In this embodiment, the driving cylinder 151 is a single-rod cylinder.

[0035] Furthermore, in this embodiment, the welding movable seat 12 is made of insulating material to prevent a short circuit phenomenon caused by forming a loop when a pair of conductive copper seats 13 conduct electricity.

[0036] Reference Figure 1 , Figure 2As shown, further, the outer contour of the conductive copper seat 13 is in a 7-shape, thereby achieving the effect of reducing the volume of the device.

[0037] The horizontal section 131 of the conductive copper seat 13 is fastened to the top of the welding fixing seat 11 by bolts, and the welding electrode 14 is fixedly disposed on the top of the horizontal section 131 of the conductive copper seat 13 .

[0038] The vertical section 132 of the conductive copper seat 13 is located at one side of the welding fixing seat 11. During operation, a pair of vertical sections 132 of the conductive copper seat 13 are respectively connected to two output ends of the transformer 3 through soft copper busbars.

[0039] Furthermore, the gap between the pair of welding electrodes 14 forms a hollow space 141 for accommodating the handle, and when the handle is located in the hollow space 141, the top of the welding electrode 14 is used to support the metal welding ear.

[0040] The pressing module 16 includes a pressing lifting driving device 161, a pressing receiving seat 162 and a pair of insulating pressing blocks 163. The pressing receiving seat 162 is arranged above the hollow position 141 in a lifting manner, and a pair of insulating pressing blocks 163 are fixedly arranged at the bottom of the pressing receiving seat 162 at intervals, and are opposite to the pair of welding electrodes 14 in the upper and lower directions.

[0041] Reference Figure 4 and Figure 5 As shown, the control module 2 includes a chassis 21 , a comprehensive processing module 22 , an input rectifier module 23 , a first IGBT inverter module 24 and a second IGBT inverter module 25 .

[0042] In this embodiment, the input rectifier module 23 is a three-phase full-bridge rectifier circuit.

[0043] The IGBT inverter module mentioned in this embodiment may adopt the full-bridge inverter circuit disclosed in Chinese patent publication number “CN202291815U”.

[0044] The electrical structure of the comprehensive processing module 22 and the control method of the first IGBT inverter module 24 and the second IGBT inverter module 25 of this embodiment are consistent with a medium frequency inverter resistance spot welding power supply system of Chinese patent announcement number "CN202291815U", which will not be elaborated here.

[0045] The input end of the first IGBT inverter module 24 and the second IGBT inverter module 25 are electrically connected to the output end of the input rectifier module 23. The control ends of the input rectifier module 23, the first IGBT inverter module 24 and the second IGBT inverter module 25 are electrically connected to the integrated processing module 22 respectively, and the above modules are monitored and controlled by the integrated processing module 22.

[0046] The output ends of the first IGBT inverter module 24 and the second IGBT inverter module 25 are electrically connected to the two input ends of the transformer 3 , respectively.

[0047] Furthermore, a filter capacitor 26 is connected in parallel between the first IGBT inverter module 24 and the second IGBT inverter module 25. When the control module 2 is working, the filter capacitor 26 can reduce the impact on the power grid and play a protective role.

[0048] Reference Figure 4 As shown, a connection window 211 is provided on one side of the chassis 21 , and the connection window 211 is connected to the inside of the chassis 21 .

[0049] A first output copper bar 212 and a second output copper bar 213 are fixedly disposed on both sides of the chassis 21 . The first output copper bar 212 and the second output copper bar 213 are symmetrically disposed, and one end thereof extends out of the connection window 211 .

[0050] The input rectifier module 23 , the first IGBT inverter module 24 and the second IGBT inverter module 25 are sequentially arranged between the first output copper bus 212 and the second output copper bus 213 along the width direction of the chassis 21 starting from the connection window 211 .

[0051] The output ends of the first IGBT inverter module 24 and the second IGBT inverter module 25 are connected to the first output copper bus 212 and the second output copper bus 213 respectively through copper busbars.

[0052] A plurality of connecting columns 215 are vertically arranged in the chassis 21, and the plurality of connecting columns 215 are arranged in a rectangular array. The circuit board of the integrated processing module 22 is located above the first IGBT inverter module 24 and the second IGBT inverter module 25, and the circuit board of the integrated processing module 22 is fixedly connected to the connecting columns 215 by bolts.

[0053] Reference Figure 5 As shown, further, a primary current sensor 4 is provided on the first output copper bus 212, and the primary current sensor 4 is electrically connected to the comprehensive processing module 22. The current of the input transformer 3 is monitored through the comprehensive processing module 22 to adjust and control the first IGBT inverter module 24 and the second IGBT inverter module 25.

[0054] Furthermore, a secondary current sensor 5 is provided on the soft copper busbar connected to an output end of the transformer 3 . The secondary current sensor 5 is electrically connected to the comprehensive processing module 22 , and the current input to the welding electrode 14 from the transformer 3 is monitored through the comprehensive processing module 22 .

[0055] During operation, a three-phase power supply of 380V industrial frequency is connected to the input rectifier module 23, and is rectified into a DC power supply by the input rectifier module 23. The DC power supply is converted into a high-frequency pulse with an adjustable proportion of 1kHz by the first IGBT inverter module 24 and the second IGBT inverter module 25. At the same time, the first IGBT inverter module 24 and the second IGBT inverter module 25 are controlled by the comprehensive processing module 22 to achieve the control of the output current;

[0056] Then the power is transformed to 500V by transformer 3 and output to welding electrode 14;

[0057] During welding, the cover body 6 is transported to the top of a pair of welding electrodes 14 through automated equipment, and the downward lifting drive device 161 drives a pair of insulating pressure blocks 163 to press the cover body 6 down to abut against the metal welding ear. Then the welding rotation drive device 15 drives the welding movable seat 12 to rotate so that the tip of the metal welding ear breaks the paint on the welding surface of the cover body, and the ear of the handle is welded to the cover body under the action of the welding electrode 14.

[0058] Compared with the welding method in the prior art (welding by breaking the paint on both sides of the cover), the present embodiment adopts single-side breaking the paint for welding, and the welding effect is more beautiful and the operation is more stable.

[0059] This equipment adopts three-phase balanced power input. Its high power factor can save energy and reduce consumption, which can reduce power supply power and infrastructure electrical investment. The symmetrical three-phase primary load does not pollute the power grid and does not require compensation and filtering equipment. It uses medium-frequency DC low-voltage and high-current for welding, which makes the welding process stable, with good fusion, no spatter, beautiful welds and good consistency, thus improving the welding quality in mass production.

[0060] Of course, the above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with this technology to understand the content of the utility model and implement it accordingly. They cannot be used to limit the protection scope of the utility model. Any modifications made according to the spirit of the main technical scheme of the utility model should be included in the protection scope of the utility model.

Claims

1. A medium frequency high current welding device for metal handles, characterized in that: The invention comprises a welding module (1), a control module (2) and a transformer (3), wherein the welding module (1) comprises a welding fixed seat (11), a welding movable seat (12), a pair of conductive copper seats (13), a pair of welding electrodes (14) and a pressing module (16), wherein the pair of conductive copper seats (13) are arranged at intervals on the top of the welding movable seat (12), the pair of welding electrodes (14) are respectively fixedly arranged on the pair of conductive copper seats (13), a hollow position (141) for accommodating a handle is formed between the pair of welding electrodes (14), the welding movable seat (12) is rotatably arranged on the welding fixed seat (11), the pressing module (16) is arranged above the welding electrodes (14), and the welding movable seat (12) is driven by a rotation driving device (15) to rotate in a plane; The control module (2) comprises a comprehensive processing module (22), an input rectifier module (23), a first IGBT inverter module (24) and a second IGBT inverter module (25); the input end of the input rectifier module (23) is connected to the industrial frequency AC power grid, and the output end thereof is electrically connected to the input ends of the first IGBT inverter module (24) and the second IGBT inverter module (25); the output ends of the first IGBT inverter module (24) and the second IGBT inverter module (25) are electrically connected to the input end of the transformer (3); and the welding electrode (14) is electrically connected to the output end of the transformer (3) via a soft copper busbar for welding; The input rectifier module (23) is electrically connected to the integrated processing module (22) to monitor its working data, and the control ends of the first IGBT inverter module (24) and the second IGBT inverter module (25) are respectively electrically connected to the integrated processing module (22) to control the magnitude of their output currents.

2. The medium frequency and high current welding equipment for metal handles according to claim 1, characterized in that: A connecting column (121) is fixedly arranged at the bottom of the welding movable seat (12), a through hole for the connecting column (121) to pass through is arranged on the welding fixed seat (11), and the connecting column (121) is rotatably arranged in the through hole.

3. The medium frequency and high current welding equipment for metal handles according to claim 2, characterized in that: The rotary drive device (15) comprises a drive cylinder (151) and a movable arm (152); one end of the movable arm (152) is fixedly connected to the bottom end of the connecting column (121), and the other end of the movable arm (152) is hinged to the movable part of the drive cylinder (151).

4. The medium frequency and high current welding equipment for metal handles according to claim 1, characterized in that: The outer contour of the conductive copper seat (13) is in the shape of a letter "7". The horizontal section (131) of the conductive copper seat (13) is tightly connected to the top of the welding fixing seat (11). The welding electrode (14) is fixedly arranged on the top of the horizontal section (131) of the conductive copper seat (13). The vertical section (132) of the conductive copper seat (13) is connected to the output end of the transformer (3) via a soft copper busbar.

5. The medium frequency and high current welding equipment for metal handles according to claim 1, characterized in that: The downward pressing module (16) comprises a downward pressing lifting drive device (161), a downward pressing accommodating seat (162) and a pair of insulating pressing blocks (163); the downward pressing lifting drive device (161) is used to drive the downward pressing accommodating seat (162) to be lifted and lowered above the hollow position (141); the pair of insulating pressing blocks (163) are fixedly arranged at the bottom of the downward pressing accommodating seat (162) at intervals, and are respectively opposite to the pair of welding electrodes (14) in the upper and lower directions.

6. The medium frequency and high current welding equipment for metal handles according to claim 1, characterized in that: A filter capacitor (26) is connected in parallel between the first IGBT inverter module (24) and the second IGBT inverter module (25).

7. The medium frequency and high current welding equipment for metal handles according to claim 1, characterized in that: The control module (2) further comprises a chassis (21), the input rectifier module (23), the first IGBT inverter module (24) and the second IGBT inverter module (25) are arranged in sequence in the chassis (21), and the comprehensive processing module (22) is fixedly arranged above the first IGBT inverter module (24) and the second IGBT inverter module (25); A plurality of connection columns (215) are vertically arranged in the chassis (21), and the plurality of connection columns (215) are arranged in a rectangular array. The integrated processing module (22) is fixedly connected to the connection columns (215) by means of bolts.

8. The medium frequency and high current welding equipment for metal handles according to claim 7, characterized in that: A connection window (211) is provided on one side of the chassis (21), and a first output copper busbar (212) and a second output copper busbar (213) are fixedly provided on both sides of the chassis (21), respectively; the first output copper busbar (212) and the second output copper busbar (213) are symmetrically arranged, and one end thereof extends out of the connection window (211).

9. The medium frequency and high current welding equipment for metal handles according to claim 8, characterized in that: The input rectifier module (23), the first IGBT inverter module (24), and the second IGBT inverter module (25) are sequentially arranged between the first output copper busbar (212) and the second output copper busbar (213) along the width direction of the chassis (21) starting from the connection window (211); The output ends of the first IGBT inverter module (24) and the second IGBT inverter module (25) are connected to the first output copper busbar (212) and the second output copper busbar (213) respectively through copper busbars.

10. The medium frequency and high current welding equipment for metal handles according to claim 8, characterized in that: A primary current sensor (4) is provided on the first output copper busbar (212), the primary current sensor (4) being electrically connected to the comprehensive processing module (22), and the current input to the transformer (3) is monitored through the comprehensive processing module (22) to regulate and control the first IGBT inverter module (24) and the second IGBT inverter module (25); A secondary current sensor (5) is provided on the output end of the transformer (3), and the secondary current sensor (5) is electrically connected to the comprehensive processing module (22). The current input from the transformer (3) to the welding electrode (14) is monitored through the comprehensive processing module (22).

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