Automatic welding device with rotary welding gun

Abstract

The utility model discloses a welding gun rotating type automatic welding device. A base, a balance cross arm, a rear parallel block, a balance fixed arm and a front parallel block in the automatic welding device form a cantilever support capable of rotating at will. The cantilever support enables the rotary pressing head to reach any position of the workbench and guarantees that the rotary pressing head is perpendicular to the workbench all the time. The welding gun is fixed to the rotating shaft through the cross-shaped sliding table, the angle steel and the shaft locking block, the servo motor drives the planetary reducer to control the welding gun to rotate automatically through the rotating shaft, accurate speed and position control over the welding gun can be achieved at the same time, and automatic welding of a circular welding seam can be achieved through the automatic welding device.

Description

Technical Field

[0001] The utility model belongs to the field of electrical automation control welding, and relates to a welding gun rotary automatic welding device, in particular to an automatic welding device for a plurality of shaft sleeve circular welds on an irregular and inconveniently rotating flat plate. Background Art

[0002] As a common circular weld on the metal frame of a vehicle cab, the weld needs to be beautiful and attractive while ensuring sufficient strength, thereby improving the appearance quality of the cab. Usually, the circular weld on the metal frame of the cab is welded manually. Due to the instability of the weld forming speed and welding angle during manual welding, it is difficult to ensure the consistency of its appearance. Even after trimming, it will affect the product quality of the cab, and at the same time, it will also affect work efficiency and increase production costs.

[0003] Therefore, it is necessary to design an automatic welding device that can weld circular welds. Summary of the invention

[0004] The purpose of the utility model is to provide a welding gun rotary automatic welding device, which has the characteristics of compact structure, advanced control, easy use, strong versatility, good stability, high safety, high welding efficiency and precision, and can be used for automatic welding and operation of multiple shaft sleeve circular welds on metal plates.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A welding gun rotary automatic welding device includes a bracket, a workbench, a base, a balancing cross arm, a rear parallel block, a balancing fixed arm, a front parallel block, a handle, a servo motor, a planetary reducer, a reducer mounting bracket, a rigid coupling, an axis locking block, a rotating shaft, a cross slide, a rectangular pressure plate, a welding gun, a rotating pressure head, and a control box; the workbench is fixedly connected to the bracket, the balancing cross arm is fixed to the workbench by screws through the base, the balancing cross arm can rotate around the vertical central axis of the base, the balancing fixed arm is connected to the balancing cross arm through the rear parallel block, the front parallel block is connected to the balancing fixed arm by a gas spring, the rear parallel block can rotate horizontally around the parallel cross arm, and the front parallel block can swing up and down under the action of the gas spring. The base, the balancing cross arm, the rear parallel block, the balancing fixed arm and the front parallel block form a cantilever bracket that can rotate at will; the cantilever bracket can enable the rotating pressure head to reach any position of the workbench and ensure that the rotating pressure head is always perpendicular to the workbench. The servo motor is fixed to the planetary reducer by screws, and the planetary reducer is fixed to the reducer mounting bracket by screws. The reducer mounting bracket is equipped with a handle and fixed to the front parallel block by a counterweight. There is a round hole at the bottom of the reducer mounting bracket. After the output shaft of the servo motor passes through the round hole, it is connected to the rotating shaft through a rigid coupling, and the rotating pressure head is connected to the rotating shaft through a threaded hole. The cross slide is fixed to the shaft locking block by angle steel, and the shaft locking block is fixed to the rotating shaft by screw compression. The rectangular pressure plate presses the welding gun in the direction of the Y axis of the cross slide. The power line and encoder line of the servo motor are connected to the control box and connected to the corresponding servo drive unit of the control box.

[0007] The servo motor is controlled by a servo motor driver (AC SERVO), the servo motor driver (AC SERVO) is controlled by a servo motor controller (DKC-Y110) on a control box, and the servo motor controller (DKC-Y110) is controlled by a PLC controller (FX3SA-20MR).

[0008] The reducer mounting bracket is composed of a counterweight block, a side plate, two reinforcing rib plates and a bottom plate. The side plate and the bottom plate are vertically welded into an L-shaped structure. Reinforcing rib plates are welded on the right-angled sides of the L-shaped structure, and then fixed to the counterweight block by hexagon socket screws through at least one circular hole in the side plate.

[0009] The control box includes a servo power-on indicator light, a servo enable indicator light, a welding completion indicator light, an emergency stop indicator light, a servo alarm indicator light, a servo motor controller panel, a servo power-on switch, an emergency stop button, a start button, a stop button, and a reset button; the servo power-on indicator light, the servo enable indicator light, the welding completion indicator light, the emergency stop indicator light, and the servo alarm indicator light are installed above the control box, the servo motor controller panel is installed in the middle of the control box, and the servo power-on switch, the emergency stop button, the start button, the stop button, and the reset button are installed below the control box.

[0010] The utility model adopts the above technical solution to achieve the following beneficial effects:

[0011] 1) In the welding device of the utility model, the base, the balance cross arm, the rear parallel block, the balance fixed arm and the front parallel block form a cantilever bracket, which can enable the rotating pressure head and the welding gun to reach any position of the workbench and ensure that the rotating pressure head is always perpendicular to the workbench. The welding gun is fixed on the rotating shaft through the cross slide, the angle steel and the shaft locking block. The rotating shaft is driven by the servo motor to drive the planetary reducer to control the automatic rotation of the welding gun, which can realize the precise speed and position control of the welding gun at the same time; the automatic welding device can realize the automatic welding of circular welds.

[0012] 2) After adopting this device, the automatic welding function of multiple circular welds of sleeves on metal plates can be realized. The pulse and direction control method of the servo motor controller can realize the precise control of the speed and position of the welding gun. The servo control system will self-check after power-on, and the fault problems that occur during the self-check process can be judged according to the status of the indicator light. After the self-check is passed, the handle can be lifted to press the rotating pressure head of the welding device on the sleeve to be welded. By adjusting the knobs in the X and Y axes of the cross slide, the welding gun can be accurately sent to the corresponding welding position, which can improve the appearance quality and welding efficiency of the product weld. In order to prevent the entanglement problem caused by the rotation of the welding gun cable, the welding gun returns to the starting position at a faster speed after the welding is completed. After that, you only need to lift the handle again and repeat the above action, so as to realize the automatic welding function of multiple circular welds of sleeves on metal plates.

[0013] 3) This device has an emergency stop function. Once an emergency occurs, press the emergency stop button, the welding gun stops rotating, the welding gun loses power and stops welding. You must press the reset key and reset button on the servo motor controller panel to restart welding. In addition, this device also has a servo alarm function. Once the servo control system fails, the servo alarm indicator will light up. The servo control system can only work normally after the fault is eliminated. Under the premise of ensuring safety, the safety risk of use is reduced. Its operation method is advanced, versatile, and easy to operate, achieving ideal technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the automatic welding device in the utility model.

[0015] Figure 2 It is a plan view of a control box of the automatic welding device in the utility model.

[0016] Figure 3 It is a schematic diagram of the servo control principle of the automatic welding device in the utility model.

[0017] Figure 4This is a schematic diagram of the PLC control principle of the automatic welding device in the utility model.

[0018] Figure 5 It is a structural schematic diagram of the automatic welding device of the utility model during welding.

[0019] Figure 6 It is a schematic diagram of the reducer mounting bracket in the utility model.

[0020] Figure 7 yes Figure 6 Right view of the middle reducer mounting bracket.

[0021] Figure 8 yes Figure 6 Bottom view of the middle reducer mounting bracket.

[0022] In the figure: 1, bracket, 2, workbench, 3, base, 4, balance cross arm, 5, rear parallel block, 6, balance fixed arm, 7, front parallel block, 8, handle, 9, servo motor, 10, planetary reducer, 11, reducer mounting bracket, 11.1, counterweight block, 11.2, side plate, 11.3, reinforcing rib plate, 11.4, bottom plate, 12, rigid coupling, 13, shaft locking block, 14, rotating shaft, 15, cross slide, 16, rectangular pressure plate, 17 , welding gun, 18, rotating pressure head, 19, control box, 19.1, servo power-on indicator light, 19.2, servo enable indicator light, 19.3, welding completion indicator light, 19.4, emergency stop indicator light, 19.5, servo alarm indicator light, 19.6, servo motor controller panel 19.6, 19.7, servo power-on switch, 19.8, emergency stop button, 19.9, start button, 19.10, stop button, 19.11, reset button.

[0023] Figure 5 The meaning of the letters: A, sleeve, B, plate. DETAILED DESCRIPTION

[0024] The present invention will be further described below through the accompanying drawings and embodiments. Figures 1 to 5 As shown, a welding gun rotary automatic welding device includes a bracket 1, a workbench 2, a base 3, a balancing cross arm 4, a rear parallel block 5, a balancing fixed arm 6, a front parallel block 7, a handle 8, a servo motor 9, a planetary reducer 10, a reducer mounting bracket 11, a rigid coupling 12, a shaft locking block 13, a rotating shaft 14, a cross slide 15, a rectangular pressure plate 16, a welding gun 17, a rotating pressure head 18, and a control box 19.

[0025] Among them, the workbench 2 is fixed on the bracket 1, the balance cross arm 4 is fixed on the workbench 2 by screws through the base 3, the balance cross arm 4 can rotate around the vertical central axis of the base 3, the balance fixed arm 6 is connected to the balance cross arm 4 through the rear parallel block 5, the front parallel block 7 is connected to the balance fixed arm 6 by a gas spring, the rear parallel block 5 can rotate horizontally around the parallel cross arm 4, and the front parallel block 7 can swing up and down under the action of the gas spring. The cantilever bracket composed of the base 3, the balance cross arm 4, the rear parallel block 5, the balance fixed arm 6 and the front parallel block 7 can make the rotating pressure head 18 reach any position of the workbench 2 and ensure that the rotating pressure head 18 is always perpendicular to the workbench 2. The servo motor 9 is fixed to the planetary reducer 10 by screws, and the planetary reducer 10 is fixed to the reducer mounting bracket 11 by screws. The reducer mounting bracket 11 is equipped with a handle 8 and fixed to the front parallel block 7 by a counterweight. There is a round hole at the bottom of the reducer mounting bracket 11. After the output shaft of the servo motor 9 passes through the round hole, it is connected to the rotating shaft 14 through the rigid coupling 12, and the rotating pressure head 18 is connected to the rotating shaft 14 through the threaded hole. The cross slide 15 is fixed to the shaft locking block 13 through the angle steel, and the shaft locking block 13 is fixed to the rotating shaft 14 by screw compression. The rectangular pressure plate 16 presses the welding gun 17 in the direction of the Y axis of the cross slide 15. Under the action of the cantilever bracket, the rotating pressure head 18 and the welding gun 17 can be moved to the target position. Under the action of the servo motor 9, the rotating shaft 14 can be driven to rotate, and then the welding gun 17 can be driven to rotate around the rotating shaft 14 to realize the automatic rotation of the welding gun 17; the power line and encoder line of the servo motor 9 are connected to the control box 19 and connected to the corresponding servo drive unit of the control box 19.

[0026] The servo motor 9 is controlled by a servo motor driver (AC SERVO), the servo motor driver (AC SERVO) is controlled by a servo motor controller (DKC-Y110) on a control box 19, the servo motor controller (DKC-Y110) is controlled by a PLC controller (FX3SA-20MR), and parameters such as the servo motor speed, position and direction can be set on the servo motor controller panel 19.6, thereby achieving precise speed, position and direction control of the welding gun 17.

[0027] Please refer to Figures 6 to 8 The reducer mounting bracket 11 is composed of a counterweight 11.1, a side plate 11.2, two reinforcing ribs 11.3 and a bottom plate 11.4. The side plate 11.2 and the bottom plate 11.4 are welded together, and the reinforcing ribs 11.3 are welded on both sides, and then fixed to the counterweight 11.1 through three round holes of the side plate 11.2 by hexagon socket screws. There is a protruding cylinder under the counterweight 11.1, which is sleeved in the ring on the front parallel block 7, and the ring is locked with screws to fix them together.

[0028] The base 3, balancing cross arm 4, rear parallel block 5, balancing fixed arm 6 and front parallel block 7 can form a cantilever bracket, which can rotate horizontally and make the end (front parallel block 7) swing up and down, so as to ensure that the rotating pressure head 18 can reach any position of the workbench 2 and make the rotating pressure head 18 always perpendicular to the workbench 2.

[0029] The control box 19 comprises: a servo power-on indicator light 19.1, a servo enable indicator light 19.2, a welding completion indicator light 19.3, an emergency stop indicator light 19.4, a servo alarm indicator light 19.5, a servo motor controller panel 19.6, a servo power-on switch 19.7, an emergency stop button 19.8, a start button 19.9, a stop button 19.10, and a reset button 19.11; the servo power-on indicator light 19.1, the servo enable indicator light 19.2, the welding completion indicator light 19.3, the emergency stop indicator light 19.4, and the servo alarm indicator light 19.5 are installed above the control box 19, the servo motor controller panel 19.6 is installed in the middle of the control box 19, and the servo power-on switch 19.7, the emergency stop button 19.8, the start button 19.9, the stop button 19.10, and the reset button 19.11 are installed below the control box 19.

[0030] To ensure safety, the servo motor controller (DKC-Y110), PLC controller (FX3SA-20MR), input signal digital quantity acquisition (SF1, SF2, SF3, KF8, SF4, KF9 and SF5 digital quantity signals), and intermediate relays (KF1, KF2, KF3, KF4, KF5, KF6, KF7, KF8, KF9 and KF10) are all powered by a DC 24V voltage that is lower than the human safety voltage. In order to improve the anti-interference ability of the servo control system and reduce the impact on other electrical components, the mains power needs to pass through the intelligent servo transformer before supplying power to the servo motor driver (AC SERVO). The digital signals SF1, SF2, SF3, KF8, SF4, KF9 and SF5 respectively represent the servo power-on switch 19.7 position signal, the start button 19.9 signal, the stop button 19.10 signal, the servo motor 9 rotation completion signal, the emergency stop button 19.8 signal, the servo system alarm signal (feedback by the servo motor driver), and the reset button 19.11 signal. Intermediate relays KF1, KF2, KF3, KF4, KF5, KF6, KF7 and KF10 respectively control the servo power-on indicator light 19.1, the servo enable indicator light 19.2, the servo motor 9 start, the servo motor 9 stop, the welding completion indicator light 19.3, the emergency stop indicator light 19.4, the welding gun 17 is powered on and the reset signal KF10 output (the reset signal is given to the servo motor driver to clear the alarm fault of the servo motor driver). The intermediate relay KF8 is controlled by the servo motor controller (DKC-Y110). After the pulse controlled by the servo motor controller (DKC-Y110) is sent, the coil of the intermediate relay KF8 is energized, the normally open contact (KF8) is closed and the signal is transmitted to the PLC controller (FX3SA-20MR). The PLC controller (FX3SA-20MR) controls the welding completion indicator light 19.3 according to the received signal. The intermediate relay KF9 is controlled by the alarm output terminal of the servo motor driver (AC SERVO). Once the servo control system fails, the KF9 coil will lose power, and its two normally closed contacts will change from open to closed. One contact controls the servo alarm indicator 19.5, and the other contacts are sent to the PLC controller (FX3SA-20MR), thereby controlling the welding gun 7 to lose power and end welding. The test has realized the automatic welding function of multiple circular welds of shaft sleeves on metal plates, improved the appearance quality of product welds and welding efficiency, reduced the safety risk of use, and achieved the ideal technical effect.

[0031] The operation method of the automatic welding device in the utility model is as follows:

[0032] 【1】Turn the servo power-on switch 19.7 on the control box 19 to the right, and its contacts will be turned on. The servo control system will start self-checking. If there is no fault, the servo power-on indicator 19.1 will light up, and the servo enable indicator 19.2 will light up. At this time, the servo control system is in normal working condition.

[0033] 【2】Put the plate B on the workbench 2 and the sleeve A at the welding position on the plate B. Lift the handle 8 upwards by hand. After the device is lifted as a whole, place the rotary pressure head 18 on the sleeve A. The cantilever bracket composed of the base 3, the balancing cross arm 4, the rear parallel block 5, the balancing fixed arm 6 and the front parallel block 7 can make the rotary pressure head 18 press the cantilever bracket vertically on the sleeve A with its own weight, ensuring that the circular welding position of the plate B and the sleeve A is in a clamped state. Then adjust the knobs of the cross slide 15 in the X and Y axis directions, so that the welding gun reaches the appropriate welding position and tighten the locking screws of the cross slide 15 in the X and Y axis directions;

[0034] 【3】Press the start button 19.9 on the control box 19. After the PLC controller (FX3SA-20MR) detects the start signal, it controls the welding gun 17 to be powered and start welding. After 500 milliseconds, the PLC controller (FX3SA-20MR) transmits the start signal to the servo motor controller (DKC-Y110). The servo motor controller sends the pulse (including the number of pulses and the pulse frequency) and the direction signal to the servo driver. The servo driver controls the servo motor to drive the welding gun 17 to rotate at a constant speed in the set direction and speed.

[0035] 【4】The welding gun 17 rotates accurately for one circle and then stops. At this time, the servo motor controller (DKC-Y110) feeds back a welding completion signal to the PLC controller (FX3SA-20MR). The PLC controller (FX3SA-20MR) controls the gun 17 to lose power and end welding. At this time, the welding completion indicator 19.3 on the control box 19 lights up, indicating that welding is completed;

[0036] 【5】After welding is completed, the servo motor controller (DKC-Y110) sends pulses (including pulse quantity and pulse frequency) and direction signals to the servo driver after a delay of 500 milliseconds. The pulse frequency sent at this time is higher than that during welding, and its direction is also opposite. The welding gun 17 is controlled to return to the starting position at the fastest speed after welding is completed, and then the handle 8 is lifted up by hand to weld the next circular sleeve.

[0037] The utility model discloses a welding gun rotary automatic welding device, which has the characteristics of advanced control, compact structure, reliable use, strong versatility, high safety, high welding efficiency and precision, and can be used for automatic welding and control of multiple circular welds of sleeves on metal flat plates. The device can realize accurate control of the speed and position of the welding gun through the pulse and direction control method of the servo motor controller. The servo control system will self-check after power-on, and the fault problems occurring during the self-check process can be judged according to the state of the indicator light. After the self-check is passed, the handle can be lifted to press the welding device on the sleeve to be welded. By adjusting the knobs in the X and Y axis directions of the cross slide, the welding gun can be accurately sent to the corresponding welding position, which can improve the appearance quality and welding efficiency of the product weld. In order to prevent the entanglement problem caused by the rotation of the welding gun cable, the welding gun returns to the starting position at a faster speed after the welding is completed, and then it only needs to lift the handle again and repeat the above action, thereby realizing the automatic welding function of multiple circular welds of sleeves on metal flat plates. The device has an emergency stop function. Once an emergency occurs, press the emergency stop button, the welding gun stops rotating, the welding gun loses power and stops welding. You must press the reset key and reset button on the servo motor controller panel to restart welding. In addition, the device also has a servo alarm function. Once the servo control system fails, the servo alarm indicator will light up. The servo control system can only work normally after the fault is eliminated. Under the premise of ensuring safety, the safety risk of use is reduced. Its control method is advanced and easy to operate, achieving ideal technical effects.

[0038] Finally, it should be noted that the above is only a preferred embodiment of the utility model, and is not intended to limit the entire content of the utility model. Although the utility model is described in detail with reference to the above embodiments, for those skilled in the art, they can still make formal modifications to the technical solutions recorded in the above embodiments, or make equivalent replacements for some of the technical features therein. All formal modifications, equivalent replacements, etc. made within the inspiration of the idea of ​​the utility model should be included in the scope of protection of the rights of the utility model.

Claims

1. A welding gun rotary automatic welding device, comprising a bracket (1), a workbench (2), a base (3), a balancing cross arm (4), a rear parallel block (5), a balancing fixed arm (6), a front parallel block (7), a handle (8), a servo motor (9), a planetary reducer (10), a reducer mounting bracket (11), a rigid coupling (12), a shaft locking block (13), a rotating shaft (14), a cross slide (15), a rectangular pressing plate (16), a welding gun (17), a rotating pressure head (18), and a control box (19); characterized in that: The workbench (2) is fixedly connected to the bracket (1); the balancing cross arm (4) is fixed to the workbench (2) by screws through the base (3); the balancing cross arm (4) can rotate around the vertical center axis of the base (3); the balancing fixed arm (6) is connected to the balancing cross arm (4) through the rear parallel block (5); the front parallel block (7) is connected to the balancing fixed arm (6) by a gas spring; the rear parallel block (5) can rotate horizontally around the parallel cross arm (4); and the front parallel block (7) can swing up and down under the action of the gas spring; the base (3), the balancing cross arm (4), the rear parallel block (5), the balancing fixed arm (6) and the front parallel block (7) form a cantilever bracket that can rotate at will; The servo motor (9) is fixed to the planetary reducer (10) by screws, and the planetary reducer (10) is fixed to the reducer mounting bracket (11) by screws. The reducer mounting bracket (11) is provided with a handle (8) and is fixed to the front parallel block (7) by a counterweight. A circular hole is provided at the lower part of the reducer mounting bracket (11). After the output shaft of the servo motor (9) passes through the circular hole, it is connected to the rotating shaft (14) by a rigid coupling (12). The rotating pressure head (18) is coaxially threadedly connected to the rotating shaft (14). Under the action of the cantilever bracket, the rotating pressure head (18) can reach any position of the workbench (2), and ensure that the rotating pressure head (18) is always perpendicular to the workbench (2). The cross slide (15) is fixed on the shaft locking block (13) by means of angle steel, the shaft locking block (13) is fixed on the rotating shaft (14) by means of screw compression, and the rectangular pressing plate (16) presses the welding gun (17) in the Y-axis direction of the cross slide (15); The power line and encoder line of the servo motor (9) are connected to the control box (19) and are connected to the corresponding servo drive unit of the control box (19).

2. A welding gun rotary automatic welding device according to claim 1, characterized in that: The servo motor (9) is controlled by a servo motor driver, the servo motor driver is controlled by a servo motor controller on a control box (19), and the servo motor controller is controlled by a PLC controller.

3. The welding gun rotary automatic welding device according to claim 1, characterized in that: The reducer mounting bracket (11) is composed of a counterweight (11.1), a side plate (11.2), two reinforcing rib plates (11.3) and a bottom plate (11.4); the side plate (11.2) and the bottom plate (11.4) are vertically welded to form an L-shaped structure; the reinforcing rib plates (11.3) are welded on two right-angled sides of the L-shaped structure and then fixed to the counterweight (11.1) by means of hexagon socket screws through at least one circular hole of the side plate (11.2).

4. The welding gun rotary automatic welding device according to claim 1, characterized in that: The control box (19) includes a servo power-on indicator light (19.1), a servo enable indicator light (19.2), a welding completion indicator light (19.3), an emergency stop indicator light (19.4), a servo alarm indicator light (19.5), a servo motor controller panel (19.6), a servo power-on switch (19.7), an emergency stop button (19.8), a start button (19.9), a stop button (19.10), and a reset button (19.11); A servo power-on indicator light (19.1), a servo enable indicator light (19.2), a welding completion indicator light (19.3), an emergency stop indicator light (19.4), and a servo alarm indicator light (19.5) are installed above the control box (19); The servo motor controller panel (19.6) is installed in the middle of the control box (19); The servo power-on switch (19.7), the emergency stop button (19.8), the start button (19.9), the stop button (19.10), and the reset button (19.11) are installed below the control box (19).

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