Submerged arc automatic welding unit

Abstract

The invention relates to the technical field of submerged arc welding equipment, in particular to an automatic submerged arc welding unit which comprises a cover with the section of an isosceles trapezoid structure, the cover at least comprises a horizontal plate and elastic inclined plates located on the two sides of the horizontal plate, and the included angle between the horizontal plate and the elastic inclined plates is adjustable. And the scaling powder stacked on the groove of the workpiece to be welded is shaped. According to the submerged-arc automatic welding unit, the inner space of the cover has the capacity of evenly placing the scaling powder, when the scaling powder is scattered all around, the elastic inclined plate buffers and absorbs impact force, scaling powder escape is reduced, and the scaling powder is stably isolated in the welding process; and the grid plate pokes the scaling powder in front of welding operation aside, most of splashing slag is conveyed away from the position above a groove to be welded, welding interference generated when a rear welding head passes through is reduced, the welding process is more stable, and the safety influence on workers is weakened.

Description

Technical Field

[0001] The invention relates to submerged arc welding equipment technology, in particular to a submerged arc automatic welding unit. Background Art

[0002] Submerged arc welding machine is a welding equipment that uses electric arc to burn under the flux and melt the welding wire to connect the weld, so it is called submerged arc welding. It has the advantages of stable welding, perfect welds, no arc light and less smoke.

[0003] As disclosed in the publication (announcement) number CN115922039A and the publication (announcement) date 2023-04-07, a straight seam submerged arc welding steel pipe welding device and a welding method thereof include a wire feeding mechanism and a welding head for conveying the welding wire downward, and a box-shaped cover is provided on the outside of the welding head, and flux circulation pipes are provided in front and behind the cover, and the flux is located above the welding equipment for cooling and circulating.

[0004] For example, the publication (announcement) number is CN104439653A, and the publication (announcement) date is 2015-03-25, which discloses a twin-wire submerged arc welding robot welding gun, comprising a welding gun body integrating a conductive nozzle and a flux nozzle, and a flux delivery pipe with a pressure relief hole connected to one side of the flux nozzle.

[0005] A drawback of existing technologies is that flux requires a good storage environment before use. If it is damp or contains impurities, the high temperature of the arc can easily cause water vapor to expand due to the heat. Furthermore, the high temperature causes oxides in the impurities to react chemically, generating gas and heat. This can increase internal pressure in the flux, leading to the accumulation of flux at the bottom to explode. This means that the flux discharged downward from the discharge port suddenly scatters in all directions, rather than being discharged at a normal, uniform rate. This reduces the amount of flux accumulated at that location, and the resulting thrust can impact the flux at that location, causing the accumulated flux to become thinner, increasing the risk of arc exposure. Furthermore, the sudden gas impact can easily cause the arc to elongate upon contact with air, leading to arc extinction. This can even cause the molten pool to come into contact with air, leading to metal oxidation and the inclusion of oxides in the weld, affecting weld quality and preventing proper melting of the wire. Furthermore, the scattered flux can pose a safety risk to workers. Summary of the Invention

[0006] The object of the present invention is to provide a submerged arc automatic welding unit to solve the above-mentioned deficiencies in the prior art.

[0007] In order to achieve the above object, the present invention provides the following technical solutions: A submerged arc automatic welding unit includes a welding head provided with a material pipe, and also includes a cover with an isosceles trapezoidal cross-section, which includes at least a horizontal plate and elastic inclined plates distributed on both sides of the horizontal plate, and the angle between the two is adjustable, wherein: The cover is assembled on the welding head and shapes the flux deposited on the groove of the workpiece to be welded; The cover also includes a grid plate that is driven to rotate and is used to clean slag formed on the moving path due to the gas compression phenomenon.

[0008] As a further description of the above technical solution: an arc-shaped plate that fits the surface of the workpiece is fixedly installed on the grid plate.

[0009] As a further description of the above technical solution: a front arc plate distributed in the forward direction of the welding head is fixedly installed on the cover, and the distance between the front arc plate and the groove is maintained by the side plates arranged thereon.

[0010] As a further description of the above technical solution: symmetrically arranged sliding rods are fixedly mounted on the grid plate, and arc-shaped slots are provided on the horizontal plate for the sliding rods to slide along a predetermined path.

[0011] As a further description of the above technical solution: the slide rod is also provided with an elastic member in a ready-to-fire state, and after firing, the elastic member pushes the grid plate away from the groove.

[0012] As a further description of the above technical solution: it also includes a locking rod fixedly mounted with a trigger rod, and the trigger rod is used to apply pressure to the elastic member to maintain the ready-to-fire state.

[0013] As a further description of the above technical solution: the end surface of the horizontal plate is provided with a slot for embedding the lock rod.

[0014] As a further description of the above technical solution: the movable elastic inclined plate pulls the lock rod to move horizontally, so that the trigger rod is separated from the elastic member.

[0015] As a further description of the above technical solution: it also includes a recovery material box provided with a suction pipe, and an air supply hood connected to the material pipe.

[0016] As a further description of the above technical solution: the gas hood is provided with a blowing port that is downward and used to exhaust air toward the forward end face of the grid plate along the welding direction.

[0017] In the above technical solution, the present invention provides a submerged arc automatic welding unit with the following beneficial effects: the horizontal plate ensures the constant height of the flux stacking, and the elastic inclined plate limits the flux accumulation slope, so that the internal space of the cover has the ability to evenly release the flux, so that the welding head can stably cover the flux when it moves on the groove. When the flux scatters, the deflectable elastic inclined plate buffers and absorbs the impact force, reducing the flux escape and ensuring the stable isolation of the flux during the welding process; at the same time, the grid plate pushes away the flux in front of the welding operation, sending most of the splashing slag away from the top of the groove to be welded, reducing the welding interference caused by the welding head passing by, making the welding process more stable, and also reducing the safety impact on the workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0019] Figure 1 A schematic diagram of assembling a workpiece to be welded and a welding head equipped with a cover and a recycling box provided in an embodiment of the present invention; Figure 2 A schematic side cross-sectional view of a roller frame for placing a workpiece to be welded and a welding head equipped with a cover after assembly according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the assembly of a welding head, a rack with a cover installed, and a recycling box provided in an embodiment of the present invention; Figure 4 A front view diagram of the assembly of a welding head and a bracket with a cover installed provided by an embodiment of the present invention; Figure 5 Schematic diagram of explosion of the welding head, the bracket with the cover installed and the gas hood provided in an embodiment of the present invention; Figure 6 A schematic diagram of a gas delivery hood from the left side according to an embodiment of the present invention; Figure 7 A schematic diagram of a rear view of a rack with a cover installed provided by an embodiment of the present invention; Figure 8 A schematic diagram of an isometric view of a rack with a cover installed according to an embodiment of the present invention; Figure 9 A schematic diagram showing a bottom view of the back of a cover provided by an embodiment of the present invention; Figure 10 A schematic diagram of an isometric perspective of a cover provided by an embodiment of the present invention; Figure 11An isometric view of the assembly of a grid plate and a locking rod according to an embodiment of the present invention; Figure 12 A schematic diagram of an isometric view of a cover provided by an embodiment of the present invention, showing half of the cover; Figure 13 for Figure 12 A magnified schematic diagram of point A; Figure 14 A schematic side cross-sectional view of the assembly of the grid plate, welding head, and workpiece groove provided by an embodiment of the present invention; Figure 15 A schematic diagram of switching the grid motion trajectory provided by an embodiment of the present invention; Figure 16 This is a schematic cross-sectional diagram of the assembly of the material pipe and the gas hood provided in an embodiment of the present invention.

[0020] Description of reference numerals: 1. Roller frame; 2. Workpiece; 21. Bevel; 3. Welding head; 31. Material pipe; 4. Recovery material box; 41. Suction pipe; 5. Hanger; 51. Connecting frame; 6. Cover; 60. Window; 61. Horizontal plate; 611. Concave section; 62. Elastic inclined plate; 621. Groove; 63. Front arc plate; 64. Elastic flat plate; 641. Side plate; 65. Guide plate; 66. Slot; 67. Closing plate; 7. Locking rod; 71. Folding rod; 72. Trigger rod; 73. Locking block; 8. Grid plate; 801. Upper arc plate; 802. Lower arc plate; 81. Sliding rod; 82. Bone rod; 83. Elastic part; 9. Air hood; 91. Air port; 92. Air pipe. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0022] See also Figure 1-16 The embodiment of the present invention provides a technical solution: a submerged arc automatic welding unit, comprising a welding head 3 provided with a material pipe 31, and a cover 6 having an isosceles trapezoidal cross-section, which includes at least a horizontal plate 61 and elastic inclined plates 62 distributed on both sides of the horizontal plate 61, and the angle between the two is adjustable, wherein: The cover 6 is assembled on the welding head 3 and shapes the flux deposited on the groove 21 of the workpiece 2 to be welded; The cover 6 further comprises a grid plate 8 which is driven to rotate and is used to clean the slag formed on the moving path due to the gas compression phenomenon.

[0023] Specifically, the welding head 3 is mounted and used using a boom, beam, or gantry device, and the device also has a wire feeding mechanism for feeding the welding wire into the welding head 3. A roller frame 1 is used to place the workpiece 2 and align the groove 21 on the workpiece 2 with the wire outlet direction of the welding head 3. The roller frame 1 rotates and transports the workpiece 2 to ensure that the groove 21 is completely welded by the welding wire. These are all existing technologies and will not be described in detail here.

[0024] Furthermore, the gas compression phenomenon is that the moisture remaining on the surface of the flux or workpiece 2 quickly decomposes into hydrogen and water vapor under the high temperature of the arc, and accumulates in the molten pool and the flux layer, or the flux particles are too fine or buried too thickly, resulting in a decrease in the permeability of the flux layer, which is blocked from gas discharge and the pressure further increases, and the resulting pressure exceeds the bearing capacity of the flux layer, resulting in the flux being suddenly impacted by the pressure and exploding, causing the flux to splash and scatter, and the broken slag formed by the flux melted by the arc will also be impacted and sprayed around, polluting the surrounding area.

[0025] Furthermore, the horizontal plate 61 is specifically a carbide metal plate, and the elastic inclined plate 62 made of elastic metal sheet is welded to the side of the horizontal plate 61, such as Figure 12 As shown, the elastic inclined plate 62 has a bent portion, and this portion serves as a bending deflection of the elastic inclined plate 62 .

[0026] Furthermore, an arc-shaped notch is opened on the horizontal plate 61, and the two notches form a resistance clamp against the outer wall of the welding head 3, which can enable the cover 6 to absorb and protect the heat of the flux, and insulate the flux to ensure the stability of the flux. At the same time, a strip opening for normal discharge of smoke is left between the two horizontal plates 61; the horizontal plate 61 has an integrally formed concave section 611, which is used to make the arc-shaped bulge below the concave section 611 provide a certain pressure on the accumulated flux, so as to reduce the scattered loss of the top of the flux layer.

[0027] The cover 6 constrains the shape of the stacked flux, with the horizontal plate 61 ensuring a constant height of the flux stack and the elastic ramp 62 limiting the slope of the flux accumulation. This ensures that the internal space of the cover 6 is capable of evenly discharging the flux, ensuring stable coverage of the flux as the welding head 3 travels over the groove 21. When the flux scatters, the deflectable elastic ramp 62 buffers and absorbs the impact (the elastic ramp 62 deflects at its curved position), reducing flux escape and ensuring stable isolation of the flux during the welding process. Simultaneously, the grid 8 pushes away the flux ahead of the welding operation, directing most of the slag splashing away from the groove 21 to be welded, reducing any interference with the welding process caused by the welding head 3 passing behind it. This makes the welding process more stable and mitigates any safety impact on workers.

[0028] In another embodiment provided by the present invention, an arc-shaped plate member that fits the surface of the workpiece 2 is fixedly mounted on the grid plate 8 .

[0029] Specifically, the grid plate 8 is composed of two upper arc plates 801 and lower arc plates 802 that are distributed up and down and have the same center. The two arc plates are specifically elastic metal sheets, which can cause the end of the lower arc plate 802 to deform and bend to a certain extent when it contacts the workpiece 2, thereby adapting to the installation height of the grid plate 8.

[0030] Further, such as Figure 8 As shown, a channel for the flux to flow forward is left between the upper arc plate 801 and the lower arc plate 802. Therefore, when the flux placed down by the welding head 3 is piled forward, most of the flux will be piled in the channel.

[0031] Most of the splashed slag (the front position of the welding head 3 without welding) enters the channel, and the lower arc plate 802 is used to provide a certain shielding for the groove 21, reducing the situation where the slag enters the groove 21. The lower arc plate 802 moves upward during the rotation process, isolating the splashed slag and flux together (such as Figure 15 As shown, the arrow indicates that after the grid plate 8 is rotated, the upper arc plate 801 and the lower arc plate 802 are vertically arranged to form a vertical isolation), and during the operation of the workpiece 2, the lower arc plate 802 shovels up and pushes away the flux and slag in front of it, and then uses the arc surface of the workpiece 2 to automatically drop the isolated flux and slag forward, which greatly reduces the slag sinking into the molten pool position following the flux accumulation, so that the position where the welding wire has not reached is normally buried with the flux, thereby ensuring the safety and stability of the welding position of the welding head 3.

[0032] In another embodiment of the present invention, a front arc plate 63 located in the forward direction of the welding head 3 is fixedly mounted on the cover 6, and the distance between the front arc plate 63 and the groove 21 is maintained by a side piece 641 provided thereon.

[0033] Specifically, a single horizontal plate 61 is welded to a front arc plate 63 made of an elastic metal sheet (which also has a deformable and bendable portion), such as Figure 8 As shown, the channel between the upper arc plate 801 and the lower arc plate 802 is lower than the inner space of the front arc plate 63 (the inner space is a trapezoidal area where the flux accumulates under the normal welding head 3), so the channel has the ability to flow most of the flux.

[0034] Furthermore, a window 60 is formed between the front arc plate 63 and the elastic inclined plate 62 to expose a small portion of the flux in a terraced shape, thereby assisting the staff in directly observing the flux scattering and making decisions on the flux splashing.

[0035] Furthermore, an elastic flat plate 64 made of an elastic metal sheet is welded to the end of the front arc plate 63 , and the side plates 641 are integrally formed and perpendicular to the side edges of the elastic flat plate 64 .

[0036] Furthermore, it also includes a bracket 5 installed on the equipment, such as Figure 7 As shown, the bracket 5 is equipped with a connecting frame 51 below, and a screw is rotatably provided on the bracket 5 for driving the connecting frame 51 to move up and down, and the screw has damping to ensure that the connecting frame 51 stays at a predetermined height (the damping setting is prior art and will not be elaborated here).

[0037] Furthermore, a connecting rod with a threaded end is welded to the connecting frame 51, and the connecting rod and the horizontal plate 61 are tightened and installed using a combination of nuts and gaskets. The number of gaskets can be changed according to actual needs, and the relative height difference between the two horizontal plates 61 can be adjusted to adapt to the groove 21 with an inclined surface inside.

[0038] The front arc plate 63 is used to adapt to the forward accumulation of flux and provide the grid plate 8 with a movable area to complete the flux separation work; and the front arc plate 63 can be deformed and bent to enable the elastic flat plate 64 to adapt to the surface of the workpiece 2 it contacts (such as horizontal, outer arc, inner arc), and at the same time, the side plate 641 can maintain sliding contact with the inner wall of the groove 21, so that the cover 6 has a guiding function during operation and reduces the possibility of the cover 6 running off.

[0039] In another embodiment provided by the present invention, symmetrically arranged sliding rods 81 are fixedly mounted on the grid plate 8, and arc-shaped slots for the sliding rods 81 to slide along a predetermined path are provided on the horizontal plate 61.

[0040] Specifically, a guide plate 65 is integrally formed on the lower end surface of the horizontal plate 61, and the guide plate 65 is inserted into the flux and used to sort out the flux stack; sliding rods 81 are welded on the two arc-shaped plates, and bone rods 82 (with rounded corners at both ends) are integrally formed on the two sliding rods 81 on the same side, and a cavity for the bone rod 82 to move is also provided on the end surface of the guide plate 65.

[0041] Furthermore, an arc-shaped slot is opened on the side wall of the guide plate 65 and connected to the chamber (the width of the arc-shaped slot is smaller than the size of the flux particles), and before installing the cover 6, the grid plate 8 needs to be placed between the two guide plates 65, and a corrosion-resistant and high-temperature resistant rubber plug is used in the process (a gap is opened on it, and a sliding rod 81 is allowed to slide, and after the sliding rod 81 slides, the gap is naturally closed due to the rubber properties, and the exposed space around the sliding rod 81 and between the gap is necessarily smaller than the size of the flux particles, thereby greatly reducing the particles from entering the chamber through the gap) to block the chamber port to ensure the stability of the internal space of the chamber.

[0042] The upper arc plate 801 and the lower arc plate 802 are guided by the arc slots to facilitate their synchronous movement, thereby ensuring that the grid plate 8 forms a stable vertical interception state.

[0043] In another embodiment provided by the present invention, an elastic member 83 in a ready-to-fire state is further provided on the slide rod 81 , and after firing, the elastic member 83 pushes the grid plate 8 away from the groove 21 .

[0044] Specifically, such as Figure 11 As shown, the elastic member 83 is specifically an arc-shaped elastic metal sheet, and is welded to one side of the bone rod 82.

[0045] After installing the grid plate 8 in the cover 6, manually pressing down on the grid plate 8 causes the elastic member 83 to accumulate force. This allows the elastic member 83 to have a greater travel after releasing the elastic force, thereby causing the grid plate 8 to move upward along the arc path, achieving the function of isolating the flux. At the same time, the upper arc plate 801 actively extends out of the horizontal plate 61, allowing the staff to intuitively know that the grid plate 8 has been triggered. The flux scattered in the window 60 is visible, allowing the staff to use a cleaning tool to clean the flux in front of the grid plate 8 and manually apply downward pressure on the grid plate 8 to cause the elastic member 83 to accumulate force again. Therefore, when the flux suddenly scatters, the grid plate 8 can take corresponding countermeasures in a timely manner, and the staff can also take secondary corresponding countermeasures after learning about it later, making the welding head 3 more capable of handling emergencies during welding.

[0046] In another embodiment provided by the present invention, a locking rod 7 is further provided with a trigger rod 72 fixedly mounted thereon. The trigger rod 72 is used to apply pressure to the elastic member 83 to maintain the cocked state.

[0047] Specifically, such as Figure 11 As shown, the trigger rods 72 are symmetrically distributed and integrally formed on the locking rod 7 , and a locking block 73 is integrally formed at the end of the trigger rod 72 .

[0048] Furthermore, a folding rod 71 with a vertically bent end is integrally formed at the end of the locking rod 7, and a groove 621 for embedding the folding rod 71 is provided on the end surface of the elastic inclined plate 62, and a strip-shaped protrusion arranged opposite to the groove 621 is also integrally formed on the elastic inclined plate 62, the purpose of which is to strengthen the groove 621 part and ensure the overall strength of the elastic inclined plate 62.

[0049] Furthermore, the strip-shaped protrusions are also buried in the flux layer, which can, on the one hand, enhance the contact surface of the elastic inclined plate 62 under impact force, and on the other hand, reduce the escape of flux from the flux accumulation slope, thereby ensuring the stability of the internal environment of the cover 6, and maintaining a predetermined distance between the end of the elastic inclined plate 62 and the surface of the workpiece 2, so that the elastic inclined plate 62 can perform normal deflection activities.

[0050] By installing the locking rod 7, the trigger rod 72 is pressed against the bone rod 82 to limit the direction in which the elastic member 83 recovers its deformation (obliquely upward along the arc-shaped slot), so that the elastic member 83 is in a state of storing force and waiting to be triggered, ensuring that the grid plate 8 has sufficient isolation capacity.

[0051] In another embodiment provided by the present invention, a slot 66 for embedding the lock rod 7 is formed on the end surface of the horizontal plate 61 .

[0052] Specifically, a hole is provided in the slot 66 for vertical insertion of the trigger rod 72 and the locking block 73. The end of the slot 66 has an eaves-shaped sealing plate 67 (the inner wall has a recess for fitting the locking rod 7), and the distance between the end of the slot 66 and the sealing plate 67 is greater than the diameter of the locking rod 7, which facilitates the downward insertion of the locking rod 7 into the slot 66.

[0053] After the cover 6 and the grid plate 8 are installed, the locking rod 7 is vertically placed in the card slot 66 until the trigger rod 72 contacts the bone rod 82 (and compresses the elastic member 83), and at the same time, the locking block 73 contacts the rounded corner of the upper end of the bone rod 82. Then, the elastic force of the elastic member 83 to restore the deformation is transmitted obliquely upward to the trigger rod 72 through the locking block 73, so that the locking rod 7 is actively embedded in the inner recess of the sealing plate 67, so that the locking rod 7 and the grid plate 8 are clamped together, which is convenient for storing the elastic force and also convenient for the locking rod 7 to trigger the work.

[0054] In another embodiment provided by the present invention, the movable elastic inclined plate 62 pulls the lock rod 7 to move horizontally, so that the trigger rod 72 is separated from the elastic member 83.

[0055] Specifically, an elastic rubber pad is bonded to the side wall of the trigger rod 72 and is used to absorb the pressure of horizontal movement. Since there are two trigger rods 72 on the lock rod 7, no matter which side of the folding rod 71 is pulled and triggered, the trigger rod 72 on the other side will also release the interference with the bone rod 82 due to horizontal movement (the bone rod 82 is in the middle of the cavity of the guide plate 65, and there is enough space for the trigger rod 72 to move on both sides of the bone rod 82 in the cavity).

[0056] By setting a groove 621 near the end of the elastic inclined plate 62, the triggering ability of the folding rod 71 is amplified, so that the locking rod 7 can be easily pulled and moved horizontally, so that the trigger rod 72 can actively disengage from the bone rod 82 and complete the firing and release of the elastic member 83. When the elastic inclined plate 62 is used for pulling work, it is necessary to consume part of the impact force, thereby reducing the escape loss of the flux.

[0057] In another embodiment provided by the present invention, it further includes a recovery material box 4 provided with a suction pipe 41 and an air supply hood 9 connected to the material pipe 31.

[0058] Specifically, the end of the suction pipe 41 is flat, which is used to amplify the suction capacity of the flux after welding, and a pump body is provided in the recovery box 4 to provide suction, and a dust filter is also provided in the recovery box 4. These are all existing technologies and will not be described in detail here.

[0059] Furthermore, the air hood 9 is connected with an air pipe 92, and the air pipe 92 is connected to the recovery material box 4 (the connection is fixed by screwing with a threaded port), and the exhaust port branch of the pump body is connected to the air pipe 92, so that the air pipe 92 can transport the circulating air flow into the air hood 9. The purpose is to eliminate the need for an external pipeline to transport the air flow, and the air flow in the pipeline has a certain temperature in the circulating state, thereby reducing the heat loss entering the air hood 9.

[0060] The air hood 9 has an annular opening that is clamped on the outside of the pressure relief hole of the material pipe 31 (the connection is detachably installed with bolts or welded), so that the air hood 9 can convey the hot air into the material pipe 31, and the air used for pressure relief can be discharged through the air hood 9, thereby realizing the dual-effect use of the air hood 9. When the circulating hot air flow is conveyed into the material pipe 31, the hot air flow can be used to dry and insulate the flux in the material pipe 31, so that the deposited flux has good laying and covering capabilities.

[0061] In another embodiment provided by the present invention, the gas hood 9 is provided with a blowing port 91 which is downward and used to exhaust gas toward the forward end face of the grid plate 8 along the welding direction.

[0062] Specifically, the air blowing port 91 is located on the inner side of the upper arc plate 801, so the grid plate 8 is further away from the blowing position of the air blowing port 91 after rotation (the distance between the upper end of the upper arc plate 801 and the welding head 3 is shortened after rotation, as shown in FIG. Figure 14 As shown, the small arrows represent the direction of airflow).

[0063] The circulated hot air is discharged from the air outlet 91 and flows diagonally downward along the curved inner sidewall of the upper curved plate 801, allowing the airflow to be blown into the groove 21 where flux is not applied in advance. This serves to clean the groove 21 (the filter on the pressure relief hole of the material pipe 31 performs a secondary filtration of dust and also retains dust as it passes through the material pipe 31, further reducing the dust content of the airflow from the air outlet 91). This leaves the inner wall of the groove 21 cleaner before welding. Furthermore, because the upper curved plate 801 guides the entire airflow, the airflow is minimally bent from the channel into the welding head 3, thus preventing airflow interference with the flux at the welding location. When the grid plate 8 is switched to a vertical position, the airflow actively blows the separated flux (originally blowing toward the upper curved plate 801), using the airflow to blow the separated flux and slag off the workpiece 2, further improving the slag handling capability.

[0064] Working principle: The shape of the stacked flux is restricted by the cover 6, so that the horizontal plate 61 ensures the constant height of the flux stacking, and the elastic inclined plate 62 limits the slope of the flux accumulation, so that the internal space of the cover 6 has the ability to evenly lower the flux, so that the welding head 3 can stably cover the flux when moving on the groove 21. When the flux scatters, the deflectable elastic inclined plate 62 buffers and absorbs the impact force, reducing the escape of the flux. At the same time, the locking rod 7 is pulled by the elastic inclined plate 62 and moves horizontally, causing the trigger rod 72 to lose its support on the bone rod 82, thereby restoring the elastic member 83 to deform and prompting the slide bar 81 to move along the path of the predetermined arc slot, so that the lower arc plate 802 in the grid plate 8 shovels up and pushes away the flux and slag in front of it, and then uses the arc surface of the workpiece 2 to automatically drop the isolated flux and slag forward, so as to send most of the splashed slag away from the top of the groove 21 to be welded, reducing the welding interference caused by the passing of the rear welding head 3, making the welding process more stable, and also reducing the safety impact on the staff.

[0065] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A submerged arc automatic welding unit, comprising a welding head (3) provided with a material pipe (31), characterized in that: It also includes a cover (6) with an isosceles trapezoidal cross-section, which includes at least a horizontal plate (61) and elastic inclined plates (62) located on both sides of the horizontal plate (61), and the angle between the two is adjustable, wherein: The cover (6) is assembled on the welding head (3) and shapes the flux deposited on the groove of the workpiece to be welded; The cover (6) further comprises a grid plate (8) which is driven to rotate and is used to clean slag formed on the moving path due to the air compression phenomenon.

2. The submerged arc automatic welding unit according to claim 1, characterized in that: An arc-shaped plate member that fits the surface of the workpiece is fixedly mounted on the grid plate (8).

3. The submerged arc automatic welding unit according to claim 1, characterized in that: A front arc plate (63) located in the forward direction of the welding head (3) is fixedly mounted on the cover (6), and the distance between the front arc plate (63) and the groove (21) is maintained by a side plate (641) provided thereon.

4. The submerged arc automatic welding unit according to claim 2, characterized in that: Symmetrically arranged sliding rods (81) are fixedly mounted on the grid plate (8), and arc-shaped slots for the sliding rods (81) to slide along a predetermined path are provided on the horizontal plate (61).

5. The submerged arc automatic welding unit according to claim 4, characterized in that: The slide bar (81) is also provided with an elastic member (83) in a ready-to-fire state. After firing, the elastic member (83) pushes the grid plate (8) away from the groove (21).

6. The submerged arc automatic welding unit according to claim 5, characterized in that: It also includes a locking rod (7) fixedly mounted with a trigger rod (72), wherein the trigger rod (72) is used to apply pressure to the elastic member (83) to maintain the ready-to-fire state.

7. The submerged arc automatic welding unit according to claim 6, characterized in that: The end surface of the horizontal plate (61) is provided with a slot (66) for embedding the lock rod (7).

8. The submerged arc automatic welding unit according to claim 7, characterized in that: The movable elastic inclined plate (62) pulls the locking rod (7) to move horizontally, so that the trigger rod (72) is separated from the elastic member (83).

9. The submerged arc automatic welding unit according to claim 2, characterized in that: It also includes a recovery material box (4) provided with a suction pipe (41), and an air supply hood (9) connected to the material pipe (31).

10. The submerged arc automatic welding unit according to claim 9, characterized in that: The gas supply hood (9) is provided with a blowing port (91) that is downward and used to exhaust gas toward the forward end face of the grid plate (8) along the welding direction.

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