Welding device for hollow cast iron pipe machining

Abstract

The invention relates to the technical field of pipe welding, and discloses a welding device for hollow cast iron pipe machining, which comprises two hollow cast iron pipes, the opposite ends of the two hollow cast iron pipes are both provided with inclined notches, and the two hollow cast iron pipes with the inclined notches are matched and attached. The outer side walls of the hollow cast iron pipes are coaxially sleeved with fixing assemblies for clamping the hollow cast iron pipes. In the process that the inner wall sliding frame slides on the inner wall of the joint ring under the action of an external driving mechanism, the telescopic metal sheet abuts against the inner wall of the adjusting ring, at the moment, a circuit is in an open circuit state, the electromagnetic generator on the inner wall sliding frame does not generate a magnetic field, and when the inner wall sliding frame slides to the position of the telescopic convex block assembly, the telescopic metal sheet abuts against the inner wall of the adjusting ring. And when the telescopic metal sheet on the inner wall sliding frame is connected with the telescopic convex block assembly, a passage can be generated at the moment, so that the electromagnetic generator on the inner wall sliding frame generates a magnetic field which is the same as that of the magnet block, the welding wire at the corresponding position can be pushed to slide in the radial direction, and then welding is completed.

Description

Technical Field

[0001] The invention relates to the technical field of pipe welding, in particular to a welding device for processing hollow cast iron pipes. Background Art

[0002] The processing of hollow cast iron pipes is usually divided into multiple processes, such as cutting and welding. The butt welding method for hollow cast iron pipes usually adopts spot welding to weld the two hollow cast iron pipes connected end to end. However, in the actual production welding process, not all coaxial linear welding is performed. Instead, the ends of the hollow cast iron pipes need to be tilted and cut off, and then the two hollow cast iron pipes with inclined surfaces are butt-welded. Such welding usually has the following problems:

[0003] First, the greater the inclination angle of the intercepted inclined surface, the thicker the inclined wall thickness produced by the interception. When this part of the inclined surface is butt-welded, the conventional coaxial linear spot welding method is compared with the angled welding method. This angled welding pipe requires a longer spot welding time, and the conventional spot welding time cannot penetrate the inclined wall thickness and weld the inclined pipe. Therefore, compared with the traditional spot welding, a longer spot welding time is required to weld the hollow cast iron pipe with increased thickness; secondly, conventional welding is usually not firm. This is because the specified time is not reached during the welding process, resulting in unstable welding during the welding process.

[0004] Therefore, we designed a welding device for processing hollow cast iron pipes. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem in the prior art that longer spot welding time is required for welding hollow cast iron pipes with increased thickness compared to traditional spot welding, and to propose a welding device for processing hollow cast iron pipes.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A welding device for processing hollow cast iron pipes includes two hollow cast iron pipes, each having an inclined notch at its opposite end. The two hollow cast iron pipes with the inclined notches are adapted to fit together. A fixing assembly for clamping the hollow cast iron pipes is coaxially sleeved on the outer walls of the hollow cast iron pipes. A positioning collar is sleeved at the joint of the two hollow cast iron pipes. A plurality of welding wires are inserted into the outer walls of the positioning collars. The plurality of welding wires are equidistantly arranged around the circumference and slide radially on the positioning collars.

[0008] The positioning collar is also provided with a welding adjustment mechanism for controlling spot welding of multiple welding wires.

[0009] Preferably, the fixing assembly comprises:

[0010] A fixed sleeve is provided with an electric telescopic rod inserted into the fixed sleeve, and the electric telescopic rods are arranged in a plurality of equal distances, and the output ends of the electric telescopic rods face the hollow cast iron pipe;

[0011] The output end of the electric telescopic rod is fixed to the side bracket, and transmission rollers are installed at both ends of the side bracket, and a transmission belt that fits the outer wall of the hollow cast iron pipe is wound between the two transmission rollers.

[0012] Preferably, the welding wire slides radially on the positioning collar through the through hole, a magnet block is fixed to one end of the welding wire, and a first return spring is sleeved on the outer wall of the welding wire, one end of the first return spring is connected to the magnet block, and the other end is connected to the positioning collar.

[0013] Preferably, the welding adjustment mechanism comprises:

[0014] The adjusting ring is coaxially arranged with the positioning collar and connected to the positioning collar via a connecting plate;

[0015] There are two push rods, which are symmetrically arranged on both sides of the adjusting ring. The push rods can be lifted and slid on the connecting plate, and a limit plate is provided at the end of the push rod. The push rods are L-shaped and can be lifted and lowered on the connecting plate through a lifting slot.

[0016] Preferably, a second lifting rod is inserted into the adjusting ring, the two pushing rods are connected to the second lifting rod through the first lifting rod, and the pushing rod drives the second lifting rod to reset and rise and fall through the second reset spring.

[0017] Preferably, the welding adjustment mechanism further comprises:

[0018] The inner wall sliding frame slides on the inner wall of the adjustment ring, and an electromagnetic generator is provided on the side of the inner wall sliding frame facing the positioning collar. The inner wall sliding frame is U-shaped, and a telescopic metal sheet is also provided on the inner wall sliding frame to abut against the inner wall of the adjustment ring.

[0019] Preferably, the inner wall of the adjustment ring is circumferentially provided with a plurality of telescopic cavities, and a telescopic convex assembly is telescopically slidable in the telescopic cavities. The telescopic convex assembly is telescopically extended in the telescopic cavities by a third return spring. The telescopic convex assembly includes:

[0020] The first bump, the second bump, the third bump, the fourth bump and the fifth bump are arranged in sequence, the fifth bump is located on both sides of the horizontal plane of the adjustment ring, the first bump is located on both sides of the vertical plane of the adjustment ring, and the first bump, the second bump, the third bump, the fourth bump and the fifth bump increase in curvature toward one side of the positioning collar.

[0021] Preferably, an annular cavity is provided in the adjusting ring, a pushing column is provided on the telescopic protrusion assembly and extends into the annular cavity, and an annular pull rope is also provided in the annular cavity and abuts against the end of the pushing column.

[0022] Preferably, the second lifting rod extends into the annular cavity, and two winding posts are fixed in the annular cavity. The two winding posts and the second lifting rod are not in the same vertical plane, and the annular pull rope passes through the middle position of the two winding posts and is connected to the second lifting rod.

[0023] Preferably, the distance from the winding post to the center of the adjusting ring is smaller than the distance from the end of the pushing post to the center of the adjusting ring.

[0024] The beneficial effects of the present invention are:

[0025] 1. In the present invention, when the inner wall sliding frame slides on the inner wall of the node ring under the action of the external driving mechanism, the telescopic metal sheet and the inner wall of the adjustment ring are against each other. At this time, the circuit is in a disconnected state, and the electromagnetic generator on the inner wall sliding frame does not generate a magnetic field. When the inner wall sliding frame slides to the position of the telescopic protrusion assembly and the telescopic metal sheet on the inner wall sliding frame is connected to the telescopic protrusion assembly, a path is generated at this time. Therefore, the electromagnetic generator on the inner wall sliding frame generates the same magnetic field as the magnet block, thereby being able to push the welding wire at the corresponding position to slide radially, thereby completing welding.

[0026] 2. During the docking process of the present invention, the higher the height of the two hollow cast iron pipes pushing and pushing the rod to lift them, the farther the elliptical inclined cross-section is from the center of the circle, and the thicker the wall thickness. The adjustment trend that occurs is that during the lifting process of the second lifting rod, the annular pull rope is pulled tight, which will make the telescopic protrusion assembly originally located in the telescopic cavity more prominent, and the more arc surface area extending out of the telescopic cavity. Then, when the inner wall sliding frame slides, the contact time between the telescopic metal sheet and the curved surface of the telescopic protrusion assembly increases. For hollow cast iron pipes with thicker wall thickness, a longer welding time is required. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic structural diagram of a welding device for processing hollow cast iron pipes proposed by the present invention;

[0028] Figure 2 This is a schematic structural diagram of a fixing assembly in a welding device for processing hollow cast iron pipes proposed by the present invention;

[0029] Figure 3 for Figure 2 A schematic diagram of the structure at point A in the middle;

[0030] Figure 4 This is a schematic structural diagram of a positioning collar in a welding device for processing hollow cast iron pipes proposed by the present invention;

[0031] Figure 5 This is a front view of a positioning collar in a welding device for processing hollow cast iron pipes proposed by the present invention;

[0032] Figure 6This is a structural diagram of a positioning collar in a welding device for processing hollow cast iron pipes proposed by the present invention.

[0033] In the figure: 1. Hollow cast iron pipe;

[0034] 2. Fixed assembly; 201. Conveyor belt; 202. Transmission roller; 203. Side bracket; 204. Electric telescopic rod; 205. Fixed sleeve;

[0035] 3. Positioning collar; 4. Welding wire; 5. Adjusting ring; 6. Magnet block; 7. First return spring; 8. Inner wall sliding frame; 9. Electromagnetic generator; 10. Telescopic chamber;

[0036] 11. Telescopic protrusion assembly; 111. First protrusion; 112. Second protrusion; 113. Third protrusion; 114. Fourth protrusion; 115. Fifth protrusion;

[0037] 12. Push rod; 13. First lifting rod; 14. Second return spring; 15. Connecting plate; 16. Second lifting rod; 17. Annular cavity; 18. Annular pull rope; 19. Winding column; 20. Pushing column. DETAILED DESCRIPTION

[0038] Reference Figures 1-6 , a welding device for processing hollow cast iron pipes, comprising two hollow cast iron pipes 1, each of which has an inclined cut at the opposite end of the two hollow cast iron pipes 1, and the two hollow cast iron pipes 1 with the inclined cuts are adapted to fit together. It should be noted that when the hollow cast iron pipes 1 are conventionally butted, it is only necessary to align the vertical cut ends. When two hollow cast iron pipes 1 with a specific bending angle need to be butt-welded, the ends of the hollow cast iron pipes 1 need to be tilted and cut first, and then the two hollow cast iron pipes 1 with inclined surfaces are butt-welded. The greater the inclination angle of the cut inclined surface, the thicker the thickness of the hollow cast iron pipe 1 at this time. However, the thickness of the inclined surface is not in a state of uniform thickness. The closer the elliptical inclined cross-section is to the center of the circle, the closer the thickness is to the original wall thickness of the hollow cast iron pipe 1. On the contrary, the farther the elliptical inclined cross-section is from the center of the circle, the thicker the wall thickness is. Therefore, it is necessary to timely adjust the spot welding time for this phenomenon to deal with the problem of different wall thicknesses caused by changes in the cut inclined angle.

[0039] The outer wall of the hollow cast iron pipe 1 is coaxially sleeved with a fixing component 2 for clamping the hollow cast iron pipe 1. Figure 2 and Figure 3In this state, the fixing assembly 2 includes a fixing sleeve 205, on which an electric telescopic rod 204 is inserted, and the electric telescopic rod 204 is arranged in multiple equal intervals, and the output end of the electric telescopic rod 204 faces the hollow cast iron pipe 1, so that the electric telescopic rod 204 can be opened, so that the conveyor belt 201 at the output end of the electric telescopic rod 204 is always close to the outer wall of the hollow cast iron pipe 1.

[0040] The fixing assembly 2 also includes a side bracket 203, the output end of the electric telescopic rod 204 is fixed to the side bracket 203, and transmission rollers 202 are installed at both ends of the side bracket 203. The same conveyor belt 201 that is in contact with the outer wall of the hollow cast iron pipe 1 is wound between the two transmission rollers 202. Therefore, the electric telescopic rod 204 controls the lifting and lowering of the conveyor belt 201 to complete the clamping of hollow cast iron pipes 1 of different sizes.

[0041] Furthermore, the setting of the conveyor belt 201 can also allow the hollow cast iron pipe 1 to slide coaxially along the fixed component 2. Therefore, for docking two hollow cast iron pipes 1 with inclined surfaces, it is only necessary to adjust the corresponding angular positions of the two fixed components 2. Then, the two hollow cast iron pipes 1 located between the two fixed components 2, under the action of gravity, make the two inclined surfaces dock and tightly abut each other, which is convenient for subsequent welding operations.

[0042] A positioning collar 3 is provided at the joint of the two hollow cast iron pipes 1, and a plurality of welding wires 4 are inserted into the outer wall of the positioning collar 3. The plurality of welding wires 4 are arranged equidistantly around the circumference and slide radially on the positioning collar 3. Therefore, it is only necessary to control the radial expansion and contraction of a single welding wire 4 on the positioning collar 3 to complete the welding operation at the joint of the two hollow cast iron pipes 1. It should be noted that a plurality of welding wires 4 are arranged circumferentially on the positioning collar 3. Compared with the single welding wire 4 welding in the prior art, the welding position of the welding wire 4 can be more accurately controlled, so that the welding points of the plurality of welding wires 4 arranged circumferentially are spot welded at the joint of the two hollow cast iron pipes 1.

[0043] The welding wire 4 slides radially on the positioning collar 3 through the through hole, a magnet block 6 is fixed to one end of the welding wire 4, and a first return spring 7 is sleeved on the outer wall of the welding wire 4, one end of the first return spring 7 is connected to the magnet block 6, and the other end is connected to the positioning collar 3. This arrangement can ensure that during the welding process of the welding wire 4, the first return spring 7 can restore the welding wire 4, that is, when the welding wire 4 moves radially along the positioning collar 3 and completes one welding of the connection between the two hollow cast iron pipes 1, in the absence of external force, the originally welded welding wire 4 can be separated from the connection between the two hollow cast iron pipes 1 under the action of the first return spring 7, that is, the welding state is released.

[0044] The positioning collar 3 is also provided with a welding adjustment mechanism for spot welding a plurality of welding wires 4 , wherein the welding adjustment mechanism is used to adjust the welding time of the connection between the welding wires 4 and the two hollow cast iron pipes 1 .

[0045] Reference Figure 4 The welding adjustment mechanism includes an adjusting ring 5, which is coaxially arranged with the positioning collar 3, and the adjusting ring 5 and the positioning collar 3 are connected by a connecting plate 15, so that the adjusting ring 5 and the positioning collar 3 can be coaxially arranged to provide support. At the same time, the adjusting ring 5 is fixed by an external bracket, which also provides support for the positioning collar 3 to be set at the connection point of the two hollow cast iron pipes 1.

[0046] The welding adjustment mechanism also includes a push rod 12, which is provided with two push rods 12 and is symmetrically arranged on both sides of the adjustment ring 5. The push rod 12 rises and slides on the connecting plate 15, and a limit plate is provided at the end of the push rod 12. The push rod 12 is L-shaped and rises and falls on the connecting plate 15 through a lifting slide. It should be noted that the setting of the push rod 12 here is used to feedback the rotation angle of the hollow cast iron pipe 1, wherein the limit plate at the end of the push rod 12 is against the outer wall of the hollow cast iron pipe 1. At this time, the greater the inclination angle of the truncated inclined surface, the greater the inclination angle of the docked hollow cast iron pipe 1 in the vertical direction, and the higher the height of the push rod 12 against the outer wall of the hollow cast iron pipe 1 at the same position.

[0047] A second lifting rod 16 is inserted on the adjusting ring 5, and the two pushing rods 12 are connected to the second lifting rod 16 through the first lifting rod 13, and the pushing rod 12 drives the second lifting rod 16 to reset and rise and fall through the second return spring 14. Therefore, the setting of the pushing rod 12 can effectively ensure that the pushing rod 12 can lift the first lifting rod 13 and the second lifting rod 16 together.

[0048] The welding adjustment mechanism also includes an inner wall sliding frame 8, which slides on the inner wall of the adjustment ring 5, and an electromagnetic generator 9 is provided on the side of the inner wall sliding frame 8 facing the positioning ring 3. The inner wall sliding frame 8 is U-shaped, and the inner wall sliding frame 8 is also provided with a telescopic metal sheet that is against the inner wall of the adjustment ring 5. Therefore, when the inner wall sliding frame 8 slides on the inner wall of the node ring 5 under the action of the external driving mechanism, the telescopic metal sheet is against the inner wall of the adjustment ring 5. At this time, the circuit is in an open circuit state, and the electromagnetic generator 9 on the inner wall sliding frame 8 does not generate a magnetic field.

[0049] The inner wall of the adjusting ring 5 is provided with a plurality of telescopic cavities 10 in a circumferential manner, and a telescopic protrusion assembly 11 is telescopically slidable in the telescopic cavity 10. The telescopic protrusion assembly 11 is telescopically extended in the telescopic cavity 10 by a third return spring. The telescopic protrusion assembly 11 includes a first protrusion 111, a second protrusion 112, a third protrusion 113, a fourth protrusion 114 and a fifth protrusion 115, which are arranged in sequence. The fifth protrusion 115 is located on both sides of the horizontal plane of the adjusting ring 5, the first protrusion 111 is located on both sides of the vertical plane of the adjusting ring 5, and the first protrusion 11 1. The curvature of the curved surfaces of the second protrusion 112, the third protrusion 113, the fourth protrusion 114 and the fifth protrusion 115 toward the side of the positioning collar 3 increases in sequence. Therefore, when the inner wall sliding frame 8 slides to the position of the telescopic protrusion assembly 11 and the telescopic metal sheet on the inner wall sliding frame 8 is connected to the telescopic protrusion assembly 11, a passage will be generated at this time. Therefore, the electromagnetic generator 9 on the inner wall sliding frame 8 generates the same magnetic field as the magnet block 6, so that the welding wire 4 at the corresponding position can be pushed to slide radially, thereby completing the welding.

[0050] It should be noted that the dwell time of the welding wire 4 sliding radially to weld with the joint of the two hollow cast iron pipes 1 is determined by the contact time between the telescopic metal sheet on the inner wall sliding frame 8 and the telescopic protrusion assembly 11 .

[0051] Reference Figure 5 In this state, since the curvature of the first protrusion 111, the second protrusion 112, the third protrusion 113, the fourth protrusion 114 and the fifth protrusion 115 toward the side of the positioning collar 3 increases in sequence, the curvature of the first protrusion 111 toward the side of the positioning collar 3 in the vertical direction will be the lowest. Then, in the process of the first protrusion 111 extending out of the telescopic cavity 10, the contact time between the telescopic metal sheet on the inner wall sliding frame 8 and the telescopic protrusion assembly 11 is the longest, and the electromagnetic generator 9 on the inner wall sliding frame 8 generates the same magnetic field as the magnet block 6 for a longer time, and the longer the welding wire 4 stays at the joint of the two hollow cast iron pipes 1 for welding. This corresponds to the above-mentioned problem: the closer the elliptical inclined cross-section is to the center of the circle, the closer the thickness is to the original wall thickness of the hollow cast iron pipe 1. On the contrary, the farther the elliptical inclined cross-section is from the center of the circle, the thicker the wall thickness is. That is, in the vertical direction, the farther away from the center of the elliptical inclined cross-section, the longer the welding time is required.

[0052] An annular cavity 17 is provided in the adjusting ring 5, and a pushing column 20 is provided on the telescopic protrusion assembly 11, which extends through the annular cavity 17. An annular pull rope 18 is also provided in the annular cavity 17, which is against the end of the pushing column 20. The second lifting rod 16 extends into the annular cavity 17. Two winding columns 19 are fixed in the annular cavity 17. The two winding columns 19 and the second lifting rod 16 are not in the same vertical plane, and the annular pull rope 18 passes through the middle position of the two winding columns 19 and is connected to the second lifting rod 16. The distance from the winding column 19 to the center of the adjusting ring 5 is less than the distance from the end of the pushing column 20 to the center of the adjusting ring 5. This arrangement ensures that the hollow cast iron pipe 1 is vertically connected to the butt joint. The greater the inclination angle in the surface direction, the higher the height of the push rod 12 against the outer wall of the hollow cast iron pipe 1 at the same position when it is lifted, and the higher the height of pulling the second lifting rod 16. Since the second lifting rod 16 is fixedly connected to the annular pull rope 18 wrapped around the two winding columns 19, the annular pull rope 18 will be tightened during the lifting process of the second lifting rod 16, which will make the telescopic protrusion assembly 11 originally located in the telescopic cavity 10 more prominent, and thereby make the first protrusion 111, the second protrusion 112, the third protrusion 113, the fourth protrusion 114 and the fifth protrusion 115 extend out of the arc surface area of ​​the telescopic cavity 10 more.

[0053] Then, when the inner wall sliding frame 8 slides, the contact time between the telescopic metal sheet and the curved curvature of the telescopic protrusion assembly 11 increases. The corresponding change trend is that the greater the inclination angle of the inclined surface cut off by the hollow cast iron pipe 1, the higher the height of the two hollow cast iron pipes 1 pushing the pushing rod 12 to lift during the docking process. At this time, the farther the elliptical inclined cross-section is from the center of the circle, the thicker the wall thickness. The adjustment trend that occurs is that during the lifting process of the second lifting rod 16, the annular pull rope 18 is tightened, which will make the telescopic protrusion assembly 11 originally located in the telescopic cavity 10 more prominent, and the more curved surface area extending out of the telescopic cavity 10. Then, when the inner wall sliding frame 8 slides, the contact time between the telescopic metal sheet and the curved curvature of the telescopic protrusion assembly 11 increases. For hollow cast iron pipes 1 with thicker wall thickness, a longer welding time is required.

[0054] The working principle of the present invention is as follows:

[0055] First, since the two hollow cast iron pipes 1 have inclined cuts at their opposite ends, the two hollow cast iron pipes 1 with inclined cuts fit together. To dock the two hollow cast iron pipes 1 with inclined surfaces, it is only necessary to adjust the corresponding angular positions of the two fixing components 2. Then, under the action of gravity, the two hollow cast iron pipes 1 located between the two fixing components 2 make the two inclined surfaces dock and tightly abut each other, which is convenient for subsequent welding operations.

[0056] Then, multiple welding wires 4 are arranged in a circular shape on the positioning collar 3. Compared with the welding of a single welding wire 4 in the prior art, the welding position of the welding wire 4 can be more accurately controlled, so that the welding points of the multiple welding wires 4 arranged in a circular shape are spot-welded in a circular shape at the connection between the two hollow cast iron pipes 1, wherein the first return spring 7 can bring the welding wire 4 to reset, that is, when the welding wire 4 moves radially along the positioning collar 3 and completes one welding of the connection between the two hollow cast iron pipes 1, in the absence of external force, the originally welded welding wire 4 can be separated from the connection between the two hollow cast iron pipes 1 under the action of the first return spring 7, that is, the welding state is released.

[0057] The limit plate at the end of the pushing rod 12 is against the outer wall of the hollow cast iron pipe 1. At this time, the greater the inclination angle of the truncated inclined surface, the greater the inclination angle of the docked hollow cast iron pipe 1 in the vertical direction, and the higher the height of the pushing rod 12 at the same position against the outer wall of the hollow cast iron pipe 1. Then the setting of the pushing rod 12 can effectively ensure that the pushing rod 12 is lifted together with the first lifting rod 13 and the second lifting rod 16.

[0058] The inner wall sliding frame 8 is also provided with a telescopic metal sheet that is against the inner wall of the adjustment ring 5. Therefore, when the inner wall sliding frame 8 slides on the inner wall of the node ring 5 under the action of the external driving mechanism, the telescopic metal sheet is against the inner wall of the adjustment ring 5. At this time, the circuit is in an open circuit state, and the electromagnetic generator 9 on the inner wall sliding frame 8 does not generate a magnetic field. When the inner wall sliding frame 8 slides to the position of the telescopic protrusion assembly 11, and the telescopic metal sheet on the inner wall sliding frame 8 is connected to the telescopic protrusion assembly 11, a passage will be generated at this time. Therefore, the electromagnetic generator 9 on the inner wall sliding frame 8 generates the same magnetic field as the magnet block 6, so it can push the welding wire 4 in the corresponding position to slide radially, thereby completing the welding.

[0059] The distance between the winding post 19 and the center of the adjusting ring 5 is smaller than the distance between the end of the pushing post 20 and the center of the adjusting ring 5. This arrangement ensures that the greater the inclination angle of the docked hollow cast iron pipe 1 in the vertical direction, the higher the height of the pushing rod 12 against the outer wall of the hollow cast iron pipe 1 being lifted at the same position, and the higher the height of pulling the second lifting rod 16. Since the second lifting rod 16 is fixedly connected to the annular pull rope 18 passing through the two winding posts 19, the annular pull rope 18 will be tightened when the second lifting rod 16 is lifted. This will make the telescopic protrusion assembly 11 originally located in the telescopic cavity 10 more prominent, and thereby allow the first protrusion 111, the second protrusion 112, the third protrusion 113, the fourth protrusion 114 and the fifth protrusion 115 to extend out of the telescopic cavity 10 with a larger arc surface area.

[0060] Then, when the inner wall sliding frame 8 slides, the contact time between the telescopic metal sheet and the curved curvature of the telescopic protrusion assembly 11 increases. The corresponding change trend is that the greater the inclination angle of the inclined surface cut off by the hollow cast iron pipe 1, the higher the height of the two hollow cast iron pipes 1 pushing the pushing rod 12 to lift during the docking process. At this time, the farther the elliptical inclined cross-section is from the center of the circle, the thicker the wall thickness. The adjustment trend that occurs is that during the lifting process of the second lifting rod 16, the annular pull rope 18 is tightened, which will make the telescopic protrusion assembly 11 originally located in the telescopic cavity 10 more prominent, and the more curved surface area extending out of the telescopic cavity 10. Then, when the inner wall sliding frame 8 slides, the contact time between the telescopic metal sheet and the curved curvature of the telescopic protrusion assembly 11 increases. For hollow cast iron pipes 1 with thicker wall thickness, a longer welding time is required.

[0061] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A welding device for processing hollow cast iron pipes, comprising two hollow cast iron pipes, wherein opposite ends of the two hollow cast iron pipes are provided with inclined cuts, and the two hollow cast iron pipes with inclined cuts are adapted to fit together, characterized in that: The outer walls of the hollow cast iron pipes are coaxially sleeved with a fixing assembly for clamping the hollow cast iron pipes. A positioning collar is sleeved at the joint of the two hollow cast iron pipes. A plurality of welding wires are inserted into the outer walls of the positioning collars. The plurality of welding wires are equidistantly arranged around the circumference and slide radially on the positioning collars. The positioning collar is also provided with a welding adjustment mechanism for controlling spot welding of multiple welding wires.

2. A welding device for processing hollow cast iron pipes according to claim 1, characterized in that: The fixed components include: A fixed sleeve is provided with an electric telescopic rod inserted into the fixed sleeve, and the electric telescopic rods are arranged in a plurality of equal distances, and the output ends of the electric telescopic rods face the hollow cast iron pipe; The output end of the electric telescopic rod is fixed to the side bracket, and transmission rollers are installed at both ends of the side bracket, and a transmission belt that fits the outer wall of the hollow cast iron pipe is wound between the two transmission rollers.

3. A welding device for processing hollow cast iron pipes according to claim 2, characterized in that: The welding wire slides radially on the positioning collar through the through hole. A magnet block is fixed to one end of the welding wire, and a first return spring is sleeved on the outer wall of the welding wire. One end of the first return spring is connected to the magnet block, and the other end is connected to the positioning collar.

4. A welding device for processing hollow cast iron pipes according to claim 1, characterized in that: The welding adjustment mechanism includes: The adjusting ring is coaxially arranged with the positioning collar and connected to the positioning collar via a connecting plate; There are two push rods, which are symmetrically arranged on both sides of the adjusting ring. The push rods can be lifted and slid on the connecting plate, and a limit plate is provided at the end of the push rod. The push rods are L-shaped and can be lifted and lowered on the connecting plate through a lifting slot.

5. A welding device for processing hollow cast iron pipes according to claim 4, characterized in that: A second lifting rod is inserted on the adjusting ring, and the two pushing rods are connected to the second lifting rod through the first lifting rod, and the pushing rod drives the second lifting rod to reset and lift through the second reset spring.

6. A welding device for processing hollow cast iron pipes according to claim 5, characterized in that: The welding adjustment mechanism also includes: The inner wall sliding frame slides on the inner wall of the adjustment ring, and an electromagnetic generator is provided on the side of the inner wall sliding frame facing the positioning collar. The inner wall sliding frame is U-shaped, and a telescopic metal sheet is also provided on the inner wall sliding frame to abut against the inner wall of the adjustment ring.

7. A welding device for processing hollow cast iron pipes according to claim 6, characterized in that: The inner wall of the adjustment ring is circumferentially provided with a plurality of telescopic cavities, and a telescopic convex assembly is telescopically slidable in the telescopic cavity. The telescopic convex assembly is telescopically extended in the telescopic cavity by a third return spring. The telescopic convex assembly includes: The first bump, the second bump, the third bump, the fourth bump and the fifth bump are arranged in sequence, the fifth bump is located on both sides of the horizontal plane of the adjustment ring, the first bump is located on both sides of the vertical plane of the adjustment ring, and the first bump, the second bump, the third bump, the fourth bump and the fifth bump increase in curvature toward one side of the positioning collar.

8. A welding device for processing hollow cast iron pipes according to claim 7, characterized in that: An annular cavity is provided in the adjusting ring, a pushing column which penetrates and extends into the annular cavity is provided on the telescopic convex block assembly, and an annular pull rope which abuts against the end of the pushing column is also provided in the annular cavity.

9. A welding device for processing hollow cast iron pipes according to claim 8, characterized in that: The second lifting rod extends into the annular cavity, and two winding posts are fixed in the annular cavity. The two winding posts and the second lifting rod are not in the same vertical plane, and the annular pull rope passes through the middle position of the two winding posts and is connected to the second lifting rod.

10. A welding device for processing hollow cast iron pipes according to claim 9, characterized in that: The distance from the winding column to the center of the adjusting ring is smaller than the distance from the end of the pushing column to the center of the adjusting ring.

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