Arc-starting device for welding and sealing machine and welding and sealing machine

Abstract

The present invention provides an arc-starting device for a welding and sealing machine and a welding and sealing machine, which relate to the field of nuclear chemical technology, and include: a base; a cover plate fixedly connected to the base; a C-shaped arc-starting device arranged on the cover plate; a tension spring arranged on the cover plate and fixedly connected to the C-shaped arc-starting device. The scheme of the present invention avoids the situation where operators enter a highly radioactive place for manual operation, achieves the purpose of quickly replacing the tungsten electrode head, and at the same time, the installation is more reliable, ensuring a good arc-starting effect.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear chemical engineering, in particular to an arc starting device for a welding sealing machine and a welding sealing machine. Background Art

[0002] The welding machine used in the highly radioactive places in the nuclear chemical industry can automatically weld the seal of the product bag sealing machine core, and the tungsten electrode welding wire completes the welding and sealing of the bag sealing device. The tungsten electrode head is a consumable part. After a certain number of welding and sealing operations, the tungsten electrode welding wire becomes passivated, affecting the quality of welding and sealing, and the tungsten electrode head must be replaced. When replacing the tungsten electrode head of the welding and sealing machine, the arc starting device on the outside of the ceramic nozzle needs to be disassembled first.

[0003] In the prior art, arc-starting devices often use arc-starting coils. The welding station is a highly radioactive environment, and the operator needs to use a three-joint manipulator to complete the replacement process. When the three-joint manipulator is remotely operated, it is extremely difficult to operate the arc-starting coil because it is close to the tungsten pole head. After the arc-starting device is removed, the manipulator cannot re-sleeve it on the tungsten pole head due to the small size of the arc-starting coil, and personnel are required to enter a highly radioactive place to assist in the completion, which often exposes personnel to radiation and makes it difficult to replace the arc-starting coil. Summary of the invention

[0004] The invention provides an arc-starting device for a welding and sealing machine and a welding and sealing machine, so as to solve the problem that it is difficult to replace an arc-starting coil and personnel need to enter a high-radioactivity field and be exposed to radiation.

[0005] In order to solve the above technical problems, the technical solution of the present invention is as follows:

[0006] An arc striking device for a welding and sealing machine, comprising:

[0007] Base;

[0008] A cover plate fixedly connected to the base;

[0009] A C-shaped arc striking device disposed on the cover plate;

[0010] A tension spring is arranged on the cover plate and fixedly connected to the C-shaped arc striking device.

[0011] Optionally, a first fixing pin and a second fixing pin are provided on the base, and the first fixing pin and the second fixing pin pass through the base.

[0012] Optionally, the base is fixedly connected to a crossbeam of the welding and sealing machine via the first fixing pin and the second fixing pin.

[0013] Optionally, the C-shaped arc striking device comprises:

[0014] A fixing rod, a tightening arm and a tightening block, wherein the fixing rod, the tightening arm and the tightening block are integrally formed.

[0015] Optionally, the cover plate is provided with a third fixing pin, a fourth fixing pin and a sixth fixing pin;

[0016] The C-shaped arc striking device is provided with a fifth fixing pin.

[0017] Optionally, the first end of the C-shaped arc striking device is rotatably connected to the cover plate through the third fixing pin.

[0018] Optionally, two ends of the tension spring are fixedly connected to the fourth fixing pin and the fifth fixing pin respectively.

[0019] Optionally, a conductive block is provided at the end of the tightening block.

[0020] Optionally, the conductive block is bonded to a ceramic nozzle of a welding and sealing machine.

[0021] The present invention also provides a welding and sealing machine, comprising the arc striking device of the welding and sealing machine as described above.

[0022] The above solution of the present invention includes at least the following beneficial effects:

[0023] The above scheme of the present invention comprises: a base; a cover plate fixedly connected to the base; a C-shaped arc striking device arranged on the cover plate; and a tension spring arranged on the cover plate and fixedly connected to the C-shaped arc striking device. The scheme of the present invention avoids the situation where operators enter highly radioactive places for manual operation, achieves the purpose of quickly replacing the tungsten electrode head, and reduces the labor intensity of personnel. At the same time, the installation is more reliable, ensuring a good arc striking effect, and also improving the arc striking reliability of the welding and sealing machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a front view of an arc striking device provided by an embodiment of the present invention;

[0025] Figure 2 is a rear view of an arc striking device provided by an embodiment of the present invention;

[0026] Figure 3 It is a schematic diagram of a welding and sealing machine provided in an embodiment of the present invention.

[0027] Description of reference numerals:

[0028] 1. Base; 11. First fixing pin; 12. Second fixing pin; 13. Third fixing pin; 14. Fourth fixing pin; 15. Fifth fixing pin; 16. Sixth fixing pin; 2. Cover plate; 3. C-shaped arc striking device; 31. Fixing rod; 32. Clamping arm; 33. Clamping block; 4. Tension spring; 5. Conductive block; 61. Crossbeam of welding sealing machine; 62. Ceramic nozzle of welding sealing machine. DETAILED DESCRIPTION

[0029] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0030] like Figures 1 to 3 As shown, an embodiment of the present invention provides an arc-starting device for a welding and sealing machine, comprising:

[0031] Base 1;

[0032] A cover plate 2 fixedly connected to the base 1;

[0033] A C-shaped arc striking device 3 provided on the cover plate 2;

[0034] A tension spring 4 is disposed on the cover plate 2 and fixedly connected to the C-shaped arc striking device 3 .

[0035] In this embodiment, the arc-starting device is installed on the crossbeam 61 of the welding machine through the base 1, and the C-shaped arc-starting device 3 is close to the ceramic nozzle 62 of the welding machine, and the tension spring 4 is in a compressed state, so that the electric spark generated by the welding machine can more easily break through the air and generate an arc. The part close to the ceramic nozzle is in an arc shape, so that the contact area between the nozzle and the arc-starting device is increased, which plays a role of reliable grounding;

[0036] When replacing the tungsten electrode head, the tungsten electrode head is removed through the buckle of the quick-change device, and then the new tungsten electrode head is installed by a manipulator to complete the entire replacement work. During reinstallation, the tension spring 4 pushes the C-shaped arc-starting device 3 against the nozzle, and the grounding is still reliable, and there is no need to operate the arc-starting device during this period.

[0037] The cover plate 2 is made of stainless steel, and protects the tension spring 4 and the C-shaped arc striking device 3 to avoid damage caused by collision of the equipment.

[0038] In this embodiment, the arc striking device is a fixed device, which is attached to the outside of the ceramic nozzle and is no longer integrally sleeved on the ceramic nozzle. Therefore, when replacing the tungsten electrode head, it is no longer necessary to operate the arc striking device, which greatly optimizes the entire operation process. The arc striking of the welding sealing machine is stable and can be used for a long time, and the parts are easy to maintain.

[0039] like Figure 1 and Figure 2 As shown, in an optional embodiment of the present invention, a first fixing pin 11 and a second fixing pin 12 are provided on the base 1 , and the first fixing pin 11 and the second fixing pin 12 pass through the base 1 .

[0040] In an optional embodiment of the present invention, the base 1 is fixedly connected to the welding and sealing machine crossbeam 61 through the first fixing pin 11 and the second fixing pin 12 .

[0041] In the above embodiment, the first fixing pin 11 and the second fixing pin 12 on the base 1 cooperate with the fixing holes on the welding and sealing machine cross beam 61, and the base 1 and the welding and sealing machine cross beam 61 are fixed by bolts.

[0042] In an optional embodiment of the present invention, the C-shaped arc striking device 3 comprises:

[0043] The fixing rod 31 , the tightening arm 32 and the tightening block 33 are integrally formed.

[0044] In this embodiment, the fixing rod 31 is fixed on the cover plate 2 through the third fixing pin 13 on the cover plate 2. The fixing rod 31 and the third fixing pin 13 are rotatably connected, so that the C-shaped arc striking device 3 can rotate with the third fixing pin 13 as an axis.

[0045] The tightening arm 32 is placed on the cross beam 61 of the welding and sealing machine, so as to play a supporting role when the C-shaped arc striking device 3 is rotated under force;

[0046] After storing energy, the tension spring 4 continuously presses the fixing rod 31 , thereby making the pressing block 33 and the ceramic nozzle 62 of the welding and sealing machine fit closely, thus playing the role of arc initiation.

[0047] In an optional embodiment of the present invention, the cover plate 2 is provided with a third fixing pin 13, a fourth fixing pin 14 and a sixth fixing pin 16;

[0048] The C-shaped arc striking device 3 is provided with a fifth fixing pin 15 .

[0049] In this embodiment, the third fixing pin 13 is arranged to penetrate the cover plate 2 , and the fourth fixing pin 14 and the sixth fixing pin 16 are arranged on the same side of the cover plate 2 as the C-shaped arc striking device 3 and the tension spring 4 .

[0050] The sixth fixing pin 16 is designed to prevent the C-shaped arc-striking device 3 from rotating too much and over-extruding the tension spring 4. When the C-shaped arc-striking device 3 rotates to a certain angle, the sixth fixing pin 16 will support the clamping arm 32 to stop the C-shaped arc-striking device 3 from rotating.

[0051] In an optional embodiment of the present invention, the first end of the C-shaped arc striking device 3 is rotatably connected to the cover plate 2 via the third fixing pin 13 .

[0052] In this embodiment, the fixing rod 31 of the C-shaped arc striking device 3 is fixed on the cover plate 2 through the third fixing pin 13 on the cover plate 2. The fixing rod 31 and the third fixing pin 13 are rotatably connected, so that the C-shaped arc striking device 3 can rotate with the third fixing pin 13 as the axis.

[0053] In an optional embodiment of the present invention, two ends of the tension spring 4 are fixedly connected to the fourth fixing pin 14 and the fifth fixing pin 15 respectively.

[0054] In this embodiment, the fifth fixing pin 15 is arranged on the inner side of the C-shaped arc striking device 3, that is, between the C-shaped arc striking device 3 and the cover plate 2, but the fifth fixing pin 15 does not contact the cover plate 2;

[0055] Two ends of the tension spring 4 are respectively fixed on the fourth fixing pin 14 and the fifth fixing pin 15 , so that the tension spring 4 is kept parallel to the cover plate 2 .

[0056] like Figure 2 As shown, in an optional embodiment of the present invention, a conductive block 5 is provided at the end of the tightening block 33 .

[0057] In an optional embodiment of the present invention, the conductive block 5 is bonded to a ceramic nozzle 62 of a welding sealing machine.

[0058] In the above embodiment, a conductive block 5 is provided at the end of the tightening block 33 to replace the arc striking coil in the prior art. After the conductive block 5 is brought into contact with the ceramic nozzle 62, the contact area between the nozzle and the arc striking device is increased, thereby achieving reliable grounding.

[0059] After the nozzle is grounded, the induced magnetic field is confined in the cavity of the ceramic nozzle, the density of magnetic flux lines increases, and the induced magnetic field formed in the cavity is enhanced, thereby greatly weakening the distribution intensity of the induced magnetic field outside the arc starting circle, which can greatly weaken the impact on high-frequency signals.

[0060] Most importantly, the intensity of the high-frequency magnetic field in the vicinity of the tungsten pole is greatly increased. The electrons emitted by the tungsten pole are more concentrated due to the Lorentz force, and the area bombarding the workpiece becomes more concentrated, making it easier to break through the gas and ignite the arc.

[0061] like Figure 3As shown, the present invention also provides a welding and sealing machine, including the arc striking device of the welding and sealing machine as described in the above embodiment.

[0062] In this embodiment, a quick release button is provided on the welding and sealing machine. By pressing the quick release button, the buckle of the tungsten electrode head can be dropped off, and the tungsten electrode head can be quickly removed.

[0063] The arc-starting device is fixed on the crossbeam 61 of the welding machine, and the top block 33 of the C-shaped arc-starting device 3 is in close contact with the ceramic nozzle 62 of the welding machine. The arc-starting device uses the principle that high magnetic permeability materials converge magnetic flux lines to concentrate the electron flow of the arc-starting spark, making it easier for the spark generated by the tungsten pole to break through the air and generate an arc.

[0064] The installation and use process of the arc-starting device of the welding and sealing machine described in the embodiment of the present invention is as follows:

[0065] 1. Select a suitable installation position on the welding machine cross beam 61 to make a hole. It is required that after the arc-starting device is installed, the conductive block 5 can be close to the welding machine ceramic nozzle 62 of the tungsten electrode; then the base 1 and the welding machine cross beam 61 are connected and fixed by the first fixing pin 11 and the second fixing pin. After the tightening block 33 presses against the welding machine ceramic nozzle 62, it is subjected to a reaction, forcing the C-shaped arc-starting device 3 to compress the tension spring 4. After the tension spring 4 is compressed and stores energy, it continues to tighten the fifth fixing pin 15, forcing the tightening block 33 and the welding machine ceramic nozzle 62 to fit closely, playing an arc-starting role. The second fixing pin 13 acts as a fixed fulcrum when the C-shaped arc-starting device 3 is rotated under force; the sixth fixing pin 16 is designed to prevent the C-shaped arc-starting device 3 from rotating too much and over-extruding the tension spring. When the C-shaped arc-starting device 3 reaches a certain angle, the sixth fixing pin 16 will press against the tightening arm 32 to stop the C-shaped arc-starting device 3 from rotating.

[0066] 2. After welding a certain number of times, the tungsten electrode head needs to be replaced in time. The operator stands in the operation room and operates the main hand of the manipulator to control the slave hand to replace the tungsten electrode head. The slave hand presses the quick release button to remove the damaged tungsten electrode head and place it in the replacement station. At this time, the tension spring 4 extends and pushes the fifth fixing pin 15, forcing the C-shaped arc striking device 3 to return to the state before the force is applied.

[0067] 3. When installing a new tungsten electrode, the slave arm takes the new tungsten electrode from the tungsten electrode storage box and places it at the replacement station. The slave arm adjusts the direction of the tungsten electrode so that the quick release button faces the viewing window and can be pressed by the slave arm clamp. The slave arm takes the tungsten electrode and holds the conductive block 5, then moves upward to complete the docking with the interface. After releasing the manipulator, if the tungsten electrode does not fall, the replacement is completed. At this time, the conductive block 5 is close to the ceramic nozzle, the tension spring 4 is compressed to store energy, and the arc-starting device is in working condition.

[0068] 4. After long-term use, in order to avoid the fatigue of the tension spring, which causes the conductive block 5 and the ceramic nozzle 62 of the welding machine to not fit tightly, making the arc of the welding machine ineffective, after the arc device has been used for a period of time, it is necessary to move the conductive block 5 by hand to check whether it can be compressed and restored.

[0069] When the welding machine is working, if the arc-starting ring is not used to ground the nozzle, the induced magnetic field generated during the high-frequency arc-starting circuit connected to the tungsten electrode is in a free state, and the magnetic field extends outward from the tungsten electrode as the center. The electrons emitted by the tungsten electrode are relatively divergent, and the bombardment target area of ​​the welding workpiece is relatively large, resulting in the arc diffusion tungsten electrode unable to quickly start the arc; at the same time, the overly divergent high-frequency induced magnetic field also has a great impact on nearby electronic circuits, such as affecting the servo motor encoder signal.

[0070] After using the arc striking device provided by the present invention:

[0071] The air resistivity near the ground is: 3×1013(Ω*m)=3×1016(Ω*mm)

[0072] The resistivity of ceramic is about: 1015 (Ω*mm)

[0073] The arc striking voltage is as high as 10000V, the pulse time is about 2μs, the pulse interval is 50ms, and it is turned on and used during the arc striking process.

[0074] According to relevant data, the current of arc spark is about 0.1mA. Applied to this model, the leakage resistance of tungsten electrode to workpiece is: 104V / 0.1mA=104V / 10-4A=108Ω.

[0075] Assuming that the ceramic nozzle is 4mm thick and the cross-sectional area is calculated based on the inner area of ​​400mm2, the ceramic resistance can be estimated according to the resistance formula as follows:

[0076] Estimation of ceramic leakage resistance: 1015(Ω*mm)*4mm / 400mm2=1013Ω. The corresponding leakage current is about one hundred thousandth of the workpiece leakage current, which can be ignored in comparison. While the arc-starting device enhances the magnetic field, the parallel shunt can be ignored. According to the Lorentz force formula: F=qVBsinθ, the charge amount remains almost unchanged, the magnetic field strength B is enhanced, the charge is concentrated, the energy density is enhanced, and it is easier to start an arc.

[0077] After the arc-starting device is installed, the grounding resistance through the welding machine beam is 1.5Ω, and the grounding resistance through the workpiece is 0.5Ω. Compared with the ceramic resistance of the leakage circuit, the two resistance values ​​are negligible, and the replacement of the grounding method has no effect on the circuit. The arc-starting device meets the arc-starting function of the on-site welding and sealing machine and meets the use requirements of radioactive sites.

[0078] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An arc striking device for a welding and sealing machine, characterized in that: Applied to welding and sealing machine, the arc starting device of welding and sealing machine includes: Base (1); A cover plate (2) fixedly connected to the base (1); A C-shaped arc striking device (3) arranged on the cover plate (2); A tension spring (4) disposed on the cover plate (2) and fixedly connected to the C-shaped arc striking device (3); The C-shaped arc striking device (3) comprises: a fixing rod (31), a tightening arm (32) and a tightening block (33); the fixing rod (31), the tightening arm (32) and the tightening block (33) are integrally formed; A conductive block (5) is provided at the end of the tightening block (33); Wherein, the conductive block (5) is bonded to the ceramic nozzle (62) of the welding and sealing machine; The cover plate (2) is provided with a third fixing pin (13), a fourth fixing pin (14) and a sixth fixing pin (16); the C-shaped arc striking device (3) is provided with a fifth fixing pin (15); when the C-shaped arc striking device (3) rotates to a certain angle, the sixth fixing pin (16) presses against the tightening arm (32) to stop the C-shaped arc striking device (3) from rotating; The first end of the C-shaped arc striking device (3) is rotatably connected to the cover plate (2) via the third fixing pin (13); When installing a new tungsten electrode head in the ceramic nozzle (62) of the welding machine, the arc striking device is fixed to the cross beam (61) of the welding machine through the base (1), the conductive block (5) at the end of the pressing block (33) of the C-shaped arc striking device (3) is tightly attached to the ceramic nozzle (62) of the welding machine, the tension spring (4) is in a compressed energy storage state, the arc striking device is in a working state, the electric spark generated by the welding machine breaks through the air, generates an arc, and the part close to the ceramic nozzle is in an arc shape.

2. The arc striking device of the welding and sealing machine according to claim 1, characterized in that: A first fixing pin (11) and a second fixing pin (12) are provided on the base (1), and the first fixing pin (11) and the second fixing pin (12) pass through the base (1).

3. The arc striking device of the welding and sealing machine according to claim 2, characterized in that: The base (1) is fixedly connected to a welding and sealing machine crossbeam (61) via the first fixing pin (11) and the second fixing pin (12).

4. The arc striking device for a welding and sealing machine according to claim 1, characterized in that: Two ends of the tension spring (4) are fixedly connected to the fourth fixing pin (14) and the fifth fixing pin (15) respectively.

5. A welding and sealing machine, characterized in that: It comprises the arc striking device of a welding and sealing machine as described in any one of claims 1 to 4, wherein the welding and sealing machine is provided with a quick release button.

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