Metal pipe welding device

Abstract

The invention discloses a metal pipe welding device, which belongs to the field of welding technology, and includes a machine body, a first clamping mechanism, a second clamping mechanism, a reamer, a push block and a welding assembly. The first clamping mechanism is responsible for clamping a pipe with a larger diameter, and the second clamping mechanism is responsible for clamping a pipe with a smaller diameter. The reamer is slidably mounted on the machine body, and can move axially in the inner hole of the corresponding pipe to expand the smaller diameter pipe to match the larger diameter pipe. The push block is used to push the smaller diameter pipe to move in the direction of the reamer so that the opposite ends of the two pipes are in contact. The welding assembly includes a fixed frame, an arc groove, an arc plate and a welding gun. The arc plate slides inside the arc groove, and the welding gun is fixed on the arc plate and can rotate around the connection position of the two pipes to perform 360-degree welding on the connection part. A motor and a gear are installed on the fixed frame to drive the arc plate to rotate, thereby realizing the welding work of the welding gun on the weld.

Description

Technical Field

[0001] The invention relates to the technical field of welding, and in particular to a metal pipe welding device. Background Art

[0002] In metal processing and manufacturing, pipe welding is a critical process. Traditionally, for pipes with the same diameter, the welding process is relatively simple. You only need to ensure the centering and coaxiality of the pipes, and then use a welding torch to weld the connection parts. However, in practical applications, it is often necessary to connect pipes with different diameters, which brings great challenges to welding work.

[0003] For welding pipes with different diameters, traditional solutions include using transition joints, reducing or expanding processes. However, these methods all have some shortcomings. For example, although transition joints can connect pipes with different diameters, they increase additional costs and material consumption, and may also reduce the overall performance of the pipeline system. The reducing process will cause the inner diameter of the pipe to become smaller, limiting the fluid flow and pressure bearing capacity in the pipeline. To this end, the present invention provides a metal pipe welding device that solves the above problems. Summary of the invention

[0004] In view of the above-mentioned technical deficiencies, an object of the present invention is to provide a metal pipe welding device capable of welding two pipes of different diameters together.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions: The present invention provides a metal pipe welding device, comprising a machine body, on which a first clamping mechanism and a second clamping mechanism for clamping two pipes to be welded are installed, and the axes of the two pipes clamped by the first clamping mechanism and the second clamping mechanism coincide with each other, and further comprising: A reamer, the reamer is slidably mounted on the machine body and is located on a side close to the first clamping mechanism. When the first clamping mechanism is in a clamping state for the pipe, the reamer can move axially in the inner hole of the corresponding pipe; A push block, which is slidably mounted on the machine body and is located on a side close to the second clamping mechanism. When the second clamping mechanism clamps the pipe, the push block can press against the end of the corresponding pipe and push the corresponding pipe toward the reamer to make the opposite ends of the two pipes contact each other; A welding assembly, the welding assembly comprising a welding gun that can rotate around a connection position of two pipe fittings, the welding gun being capable of performing welding work on the connection position of the two pipe fittings; Among them, the reamer is provided with a conical surface, a first circular surface and a second circular surface, the diameter of the first circular surface is larger than the diameter of the second circular surface, the first circular surface faces the first clamping mechanism, and the second circular surface faces the second clamping mechanism. When the pipe clamped by the second clamping mechanism moves, the conical surface first completes the reaming work on the end of the pipe, and then contacts the pipe clamped by the first clamping mechanism.

[0006] Preferably, the welding assembly includes a fixing frame mounted on the machine body, an arc groove is provided inside the fixing frame, the axis of the arc groove coincides with the axis of the inner clamping pipe, an arc plate is slidably mounted inside the arc groove, and the welding gun is fixed on the arc plate.

[0007] Preferably, the arc groove is provided with an opening, and the arc angle of the arc groove and the arc plate is greater than 180 degrees. The number of the welding guns is two, and the two welding guns are symmetrically arranged around the axis of the arc plate.

[0008] Preferably, a gear is rotatably mounted inside the fixing frame, teeth are arranged on the outer annular surface of the arc plate, the gear is meshed with the teeth, and a motor for driving the gear to rotate is mounted on the fixing frame.

[0009] Preferably, two support plates are fixed on the arc plate, a linear push rod is fixed on each of the support plates, and the two welding guns are respectively mounted on the output ends of the linear push rods.

[0010] Preferably, a plurality of oil supply channels are provided inside the second circular surface of the reamer, and the oil supply channels penetrate through the second circular surface, and an oil supply ball is installed inside each of the oil supply channels.

[0011] Preferably, a main oil passage is provided inside the reamer, and the plurality of oil supply passages are all connected to the main oil passage, and the main oil passage is connected to an external oil supply mechanism through an oil pipe.

[0012] Preferably, a limiting opening is provided in the middle of the oil supply passage, and the diameter of the limiting opening is smaller than the diameter of the oil supply ball.

[0013] Preferably, the first clamping mechanism includes a first lower clamping plate and a first upper clamping plate, and a first driving unit for driving the first upper clamping plate to move up and down is installed on the body. The second clamping mechanism includes a second lower clamping plate and a second upper clamping plate, and a second driving unit for driving the second upper clamping plate to move up and down is installed on the body.

[0014] Preferably, a first oil cylinder and a second oil cylinder for driving the reamer and the push block to slide are installed on the machine body.

[0015] The beneficial effects of the present invention are: The metal pipe welding device realizes full-circle welding of two pipes with different diameters by precisely controlling the centering and coaxiality of the pipe and adopting a welding gun that can rotate around the connection position of the pipe, which not only improves the welding quality but also significantly improves the welding efficiency.

[0016] The design of the reamer enables the smaller diameter pipe to be expanded smoothly to match the larger diameter pipe, solving the problem of difficult alignment in traditional welding methods due to different pipe diameters.

[0017] The design of the lubrication device, through the ingenious combination of the oil supply ball and the oil supply channel, realizes automatic lubrication of the inner wall of the pipe during the hole expansion process, reduces friction resistance, improves the hole expansion efficiency and the smoothness of the pipe surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention.

[0019] Figure 2 Schematic diagram of the welding assembly structure.

[0020] Figure 3 The figure is an internal cross-sectional view of the fixing frame.

[0021] Figure 4 This is the front view of the welded assembly.

[0022] Figure 5 State diagram for hole expansion work.

[0023] Figure 6 This is a structural diagram of the reamer.

[0024] Figure 7 This is an internal cross-sectional view of the reamer.

[0025] Figure 8 for Figure 7 Enlarged view of point A in .

[0026] In the figure: 1. body, 2. first clamping mechanism, 201. first lower clamping plate, 202. first upper clamping plate, 3. second clamping mechanism, 301. second lower clamping plate, 302. second upper clamping plate, 4. reamer, 401. first circular surface, 402. conical surface, 403. second circular surface, 404. oil supply ball, 405. oil supply channel, 406. main oil channel, 5. welding assembly, 501. fixing frame, 502. arc plate, 503. linear push rod, 504. support plate, 505. arc groove, 506. welding gun, 507. gear, 6. first oil cylinder, 7. second oil cylinder. DETAILED DESCRIPTION

[0027] The present invention is described below with specific embodiments, but they are not intended to be limiting of the invention.

[0028] Embodiment 1 like Figure 1-Figure 5 As shown, in this embodiment, a metal pipe welding device is provided, including a body 1, on which a first clamping mechanism 2 and a second clamping mechanism 3 for clamping two pipes to be welded are installed, and the axes of the two pipes clamped by the first clamping mechanism 2 and the second clamping mechanism 3 coincide, and the welding device is intended to achieve coaxial connection of two pipes with different diameters. Among them, the first clamping mechanism 2 is responsible for clamping the pipe with a larger diameter, while the second clamping mechanism 3 clamps the pipe with a smaller diameter, the first clamping mechanism 2 includes a first lower clamping plate 201 and a first upper clamping plate 202, and the body 1 is equipped with a first driving part for driving the first upper clamping plate 202 to move up and down, so as to clamp the metal pipe with a larger diameter, the second clamping mechanism 3 includes a second lower clamping plate 301 and a second upper clamping plate 302, and the body 1 is equipped with a second driving part for driving the second upper clamping plate 302 to move up and down, so as to clamp the metal pipe with a smaller diameter, and also includes a reamer 4, a push block and a welding assembly 5.

[0029] The reamer 4 is slidably mounted on the body 1, and the reamer 4 is located on a side close to the first clamping mechanism 2. When the first clamping mechanism 2 is in a clamping state for the pipe, the reamer 4 can move axially in the inner hole of the corresponding pipe, and the outer diameter of the reamer 4 is designed to match the inner hole diameter of the large-diameter pipe fastened by the first clamping mechanism 2. The first clamping mechanism 2 applies a large clamping force to the pipe to ensure that the pipe remains fixed during the clamping process. When the reamer 4 performs the reaming operation, it will exceed the outer edge of the thicker pipe, thereby providing sufficient space for reaming the thinner pipe.

[0030] The pushing block is slidably mounted on the machine body 1, and the pushing block is located on a side close to the second clamping mechanism 3. When the second clamping mechanism 3 clamps the pipe, the pushing block can press against the end of the corresponding pipe and push the corresponding pipe toward the reamer 4, so that the opposite ends of the two pipes are in contact. The clamping force of the second clamping mechanism 3 on the pipe is relatively small, allowing the thinner pipe clamped by it to slide inside it while maintaining the clamping state, thereby achieving movement toward the direction of the thicker pipe.

[0031] The body 1 is provided with a first oil cylinder 6 and a second oil cylinder 7 for driving the reamer 4 to move and the push block to slide. The output shaft of the first oil cylinder 6 is connected to the reamer 4. The extension and contraction of the output shaft of the first oil cylinder 6 will drive the reamer 4 to move. The output shaft of the second oil cylinder 7 is connected to the push block.

[0032] The welding assembly 5 includes a welding gun 506 that can rotate around the connection position of the two pipe fittings. The welding gun 506 can perform welding work on the connection position of the two pipe fittings. The welding gun 506 can perform 360-degree welding on the connection parts of the two pipe fittings and form a weld at the welding part. The specific structure of the welding gun 506 is a component commonly used in the prior art, so the specific structure of the welding gun 506 is not specifically explained in the present invention.

[0033] The reamer 4 is provided with a conical surface 402, a first circular surface 401 and a second circular surface 403. The diameter of the first circular surface 401 is larger than the diameter of the second circular surface 403. The first circular surface 401 faces the first clamping mechanism 2, and the second circular surface 403 faces the second clamping mechanism 3. During the movement of the pipe clamped by the second clamping mechanism 3, the conical surface 402 first reams the end of the pipe, and then contacts the pipe clamped by the first clamping mechanism 2. The size of the second circular surface 403 is smaller than the inner diameter of the thinner pipe, ensuring that when the thinner pipe moves toward the reamer 4, the second circular surface 403 does not contact the pipe, but plays a guiding role. Once in contact with the conical surface 402, the conical surface 402 begins to reame the pipe until its diameter is the same as or similar to that of the thicker pipe. In this way, the contacting parts of the two pipes have the same or similar diameters, and the contacting parts are exactly the areas where the end of the welding gun 506 will pass through and perform the welding work, thereby ensuring the smooth progress of the welding work.

[0034] Embodiment 2 like Figure 1-Figure 5 As shown, based on the first embodiment, this embodiment provides a structure of a welding assembly 5, which is specifically as follows: The welding assembly 5 includes a fixing frame 501 mounted on the machine body 1, an arc groove 505 is provided inside the fixing frame 501, the axis of the arc groove 505 coincides with the axis of the internally clamped pipe fitting, an arc plate 502 is slidably mounted inside the arc groove 505, a welding gun 506 is fixed on the arc plate 502, when the arc plate 502 slides inside the arc groove 505 (i.e., rotates around the axis of the arc groove 505), the welding gun 506 mounted on the arc plate 502 will also rotate around the axis. In this way, the end of the welding gun 506 can accurately point to and align with the connection part of the two pipe fittings, so as to smoothly perform the welding operation on the pipe fittings.

[0035] The arc groove 505 is provided with an opening, and the arc angle of the arc groove 505 and the arc plate 502 is greater than 180 degrees. There are two welding guns 506, which are arranged symmetrically about the axis of the arc plate 502. Figure 4The arc plate 502 has an arc angle of r, 180 < r > 360, and the installation angle between the two welding guns 506 is 180 degrees around the axis of the arc groove 505. The arc plate 502 only needs to be rotated 180 degrees around this axis to achieve full-circle (360-degree) welding of the pipe fitting. Specifically, each welding gun 506 is responsible for 180 degrees of welding work. The opening is to facilitate the removal of the pipe fitting after welding is completed to prevent it from being stuck in the arc groove 505.

[0036] A gear 507 is installed for rotation inside the fixed frame 501, and teeth are provided on the outer ring surface of the arc plate 502, and the gear 507 meshes with the teeth. A motor for driving the gear 507 to rotate is installed on the fixed frame 501. The motor drives the gear 507 to rotate, and the gear 507 meshes with the teeth provided on the arc plate 502, thereby causing the arc plate 502 to rotate around the axis of the arc groove 505. When the arc plate 502 moves inside the arc groove 505, the welding gun 506 installed on the arc plate 502 will also move, thereby realizing the welding work of the welding gun 506 on the weld.

[0037] Two support plates 504 are fixed on the arc plate 502, and a linear push rod 503 is fixed on each support plate 504. Two welding guns 506 are respectively installed at the output ends of the linear push rod 503. The support plate 504 serves as a connecting component between the arc plate 502 and the welding gun 506. Under the push of the linear push rod 503, the welding gun 506 can be moved along its own axial direction, so as to achieve the purpose of approaching and welding the connection parts of the two pipe fittings. The linear push rod 503 is not the innovation point of the present invention, so the present invention will not be explained in detail.

[0038] Embodiment 3 like Figure 6-Figure 8 As shown, based on the first and second embodiments, this embodiment provides a lubricating device for the reamer 4, which is as follows: A plurality of oil supply passages 405 are provided inside the second circular surface 403 of the reamer 4. The oil supply passages 405 penetrate the second circular surface 403. An oil supply ball 404 is installed inside each oil supply passage 405. The oil supply ball 404 is a spherical design. Before the reamer 4 performs reaming operation on thinner pipes, the diameter of the second circular surface 403 is smaller than the diameter of the pipe to be reamed. Therefore, when the pipe moves inward, it will first come into contact with the oil supply ball 404. Since the oil supply ball 404 will slide into the inside of the oil supply passage 405, this action will simultaneously trigger the opening of the oil supply passage 405, so that the lubricating oil can be applied to the inner wall of the pipe. The oil supply passage 405 is a sphere, so the lubricating oil can be first applied to the oil supply ball 404, and then contact the inner wall of the corresponding pipe through the oil supply ball 404, and then be applied to the inner wall of the pipe, thereby ensuring that the reaming process can proceed smoothly.

[0039] A main oil passage 406 is provided inside the reamer 4, and a plurality of oil supply passages 405 are all connected to the main oil passage 406. The main oil passage 406 is connected to an external oil supply mechanism through an oil pipe. The lubricating oil inside the main oil passage 406 has a certain oil pressure, which will press the oil supply ball 404 tightly against the outlet position of the oil supply passage 405, thereby effectively sealing the outlet of the oil supply passage 405 and preventing the lubricating oil from flowing out. Only when the pipe fitting comes into contact with the oil supply ball 404, the oil supply ball 404 will be pushed, thereby opening the outlet of the oil supply passage 405, so that the lubricating oil can flow out smoothly from the outlet.

[0040] A limit opening is provided in the middle of the oil supply passage 405, and the diameter of the limit opening is smaller than the diameter of the oil supply ball 404. Figure 8 As shown, the diameter of the limit opening is d, and d is smaller than the diameter of the oil supply ball 404. This means that when the oil pressure inside the oil supply passage 405 is small or there is no oil pressure, the oil supply ball 404 will be restricted by the limit opening during its inward movement and cannot pass through the limit opening. Therefore, the limit opening plays a role in constraining the oil supply ball 404 inside the oil supply passage 405.

[0041] Working principle: First, the first clamping mechanism 2 and the second clamping mechanism 3 clamp the pipe with a larger diameter and the pipe with a smaller diameter respectively to ensure that the axes of the two pipes coincide. The first clamping mechanism 2 applies a larger clamping force to fix the pipe with a larger diameter; the second clamping mechanism 3 applies a smaller clamping force to allow the pipe with a smaller diameter to slide inside it.

[0042] Start the first oil cylinder 6 to drive the reamer 4 to move in the direction close to the first clamping mechanism 2, and start the second oil cylinder 7 to drive the push block to push the small diameter pipe fitting to move in the direction of the large diameter pipe fitting until the end faces of the two are in close contact. The conical surface 402 of the reamer 4 first contacts the end of the small diameter pipe fitting. As the reamer 4 continues to advance, the conical surface 402 expands the pipe fitting until its diameter matches that of the large diameter pipe fitting. During the expansion process, the oil supply ball 404 is pushed by the inner wall of the pipe fitting to open the outlet of the oil supply channel 405, release the lubricating oil, and reduce friction.

[0043] The motor drives the gear 507 to rotate, and the gear 507 meshes with the teeth on the arc plate 502, driving the arc plate 502 and the welding gun 506 fixed on the arc plate 502 to rotate around the pipe connection position. At the same time, the linear push rod 503 pushes the welding gun 506 to move along its axial direction to perform 360-degree welding on the pipe connection part. The two welding guns 506 are arranged symmetrically at 180 degrees, each responsible for half of the welding work, to ensure the integrity of the welding.

[0044] After welding is completed, turn off the motor and the cylinder, and take out the welded pipe through the opening on the fixing frame.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the present invention can still be modified or replaced by equivalents. Any modification or partial replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A metal pipe welding device, comprising a body (1), wherein a first clamping mechanism (2) and a second clamping mechanism (3) for clamping two pipes to be welded are mounted on the body (1), wherein the axes of the two pipes clamped by the first clamping mechanism (2) and the second clamping mechanism (3) coincide with each other, and wherein: Also includes: A reamer (4), the reamer (4) being slidably mounted on the machine body (1), and the reamer (4) being located on a side close to the first clamping mechanism (2), and when the first clamping mechanism (2) is in a state of clamping the pipe, the reamer (4) is able to move axially in the inner hole of the corresponding pipe; A pushing block, the pushing block being slidably mounted on the machine body (1), and the pushing block being located on a side close to the second clamping mechanism (3), and when the second clamping mechanism (3) clamps the pipe fitting, the pushing block can press against the end of the corresponding pipe fitting and push the corresponding pipe fitting toward the reamer (4), so that the opposite ends of the two pipe fittings are in contact; A welding assembly (5), the welding assembly (5) comprising a welding gun (506) capable of rotating around a connection position of two pipe pieces, the welding gun (506) being capable of performing welding work on the connection position of the two pipe pieces; The reamer (4) is provided with a conical surface (402), a first circular surface (401) and a second circular surface (403); the diameter of the first circular surface (401) is larger than the diameter of the second circular surface (403); the first circular surface (401) faces the first clamping mechanism (2); the second circular surface (403) faces the second clamping mechanism (3); when the pipe clamped by the second clamping mechanism (3) moves, the conical surface (402) first reams the end of the pipe, and then contacts the pipe clamped by the first clamping mechanism (2).

2. A metal pipe welding device according to claim 1, characterized in that: The welding assembly (5) comprises a fixing frame (501) mounted on the machine body (1); an arc-shaped groove (505) is provided inside the fixing frame (501); the axis of the arc-shaped groove (505) coincides with the axis of the inner clamping pipe fitting; an arc plate (502) is slidably mounted inside the arc-shaped groove (505); and the welding gun (506) is fixed on the arc plate (502).

3. A metal pipe welding device according to claim 2, characterized in that: The arc groove (505) is provided with an opening, and the arc angle of the arc groove (505) and the arc plate (502) is greater than 180 degrees. There are two welding guns (506), and the two welding guns (506) are symmetrically arranged around the axis of the arc plate (502).

4. A metal pipe welding device according to claim 2, characterized in that: A gear (507) is rotatably mounted inside the fixed frame (501), teeth are provided on the outer annular surface of the arc plate (502), the gear (507) is meshed with the teeth, and a motor for driving the gear (507) to rotate is mounted on the fixed frame (501).

5. A metal pipe welding device according to claim 2, characterized in that: Two support plates (504) are fixed on the arc plate (502), a linear push rod (503) is fixed on each of the support plates (504), and the two welding guns (506) are respectively installed on the output ends of the linear push rod (503).

6. A metal pipe welding device according to claim 1, characterized in that: A plurality of oil supply passages (405) are provided inside the second circular surface (403) of the reamer (4), the oil supply passages (405) running through the second circular surface (403), and an oil supply ball (404) is installed inside each of the oil supply passages (405).

7. A metal pipe welding device according to claim 6, characterized in that: A main oil passage (406) is provided inside the reamer (4), and the plurality of oil supply passages (405) are all in communication with the main oil passage (406), and the main oil passage (406) is in communication with an external oil supply mechanism via an oil pipe.

8. A metal pipe welding device according to claim 7, characterized in that: A limiting opening is provided in the middle of the oil supply passage (405), and the diameter of the limiting opening is smaller than the diameter of the oil supply ball (404).

9. A metal pipe welding device according to claim 1, characterized in that: The first clamping mechanism (2) comprises a first lower clamping plate (201) and a first upper clamping plate (202), and a first driving unit for driving the first upper clamping plate (202) to move up and down is installed on the machine body (1). The second clamping mechanism (3) comprises a second lower clamping plate (301) and a second upper clamping plate (302), and a second driving unit for driving the second upper clamping plate (302) to move up and down is installed on the machine body (1).

10. A metal pipe welding device according to claim 1, characterized in that: The machine body (1) is provided with a first oil cylinder (6) and a second oil cylinder (7) for driving the reamer (4) and the push block to slide.

Images