A continuous tube whole tube welding pre-welding preheating dust removal device and method

Abstract

This invention belongs to the field of petroleum pipe processing technology, and specifically relates to a preheating and dust removal device and method for continuous pipe welding. The device includes a base and a temperature control cabinet. The base is sequentially equipped with two sets of grinding dust removal sections, a preheating section, and a first temperature measuring thermocouple. The grinding dust removal section includes multiple grinding dust removal section bases, grinding dust removal section support frames, and two grinding support tables. A grinding disc pasting plate is located in the middle of the two grinding support tables. The preheating section includes multiple preheating section bases, preheating section support legs, and fastening strips. An upper induction coil shell and a lower induction coil shell are respectively connected to the fastening strips. An opening in the preheating section is located at the connection between the upper and lower induction coil shells. Induction coils are installed inside the upper and lower induction coil shells. This invention ensures a high cleanliness level in the weld area while maintaining the preheating temperature of the welded pipe, reducing thermal stress in the weld, increasing the weldability of special alloys, and ensuring the development of special alloy continuous pipes.

Description

Technical Field

[0001] This invention belongs to the field of petroleum pipe processing technology, and specifically relates to a preheating and dust removal device and method for continuous pipe welding. Background Technology

[0002] Currently, with the exploitation and utilization of unconventional oil and gas resources, coiled tubing, as a powerful tool for oil and gas resource development, is also transforming from conventional product development to customized development. This has led to the development and production of special coiled tubing. The plates suitable for coiled tubing have evolved from the initial dedicated coiled tubing plates to the development of coiled tubing made of special alloy steel, aluminum alloy, and nickel-based alloys. For the preparation of this series of special alloy coiled tubing, preheating before welding and postheating treatment are the most crucial production processes. If the preheating treatment process does not meet the specified requirements, cold cracking and delayed cracking can easily occur, seriously affecting the safe operation of alloy steel pressure pipelines and containers.

[0003] In the continuous tube forming process, the main welding processes involved are oblique weld butt joint technology and longitudinal weld welding technology. Among them, oblique weld butt joint is mainly used for continuous tube sheet butt joint forming. Since the welding area of ​​the butt plate is small, the preheating before welding and the heat treatment after welding are relatively easy to control. However, for the longitudinal weld welding of continuous tube, since the welding process is continuous and requires a certain welding speed, it is difficult to meet the preheating function during production. Currently, there is no equipment on the market specifically for preheating and dust removal of longitudinal welds of continuous tube.

[0004] Using existing muffle furnaces for online preheating of continuous tubes results in uneven and low preheating temperatures, failing to meet the requirements for online welding heat treatment. Using existing heat treatment furnaces leads to water vapor evaporating from the plate surface and accumulating inside the furnace, resulting in poor surface dryness and welding defects. Currently, there is no dedicated dust-removing online heat treatment equipment for continuous tubes on site, making it impossible to fully guarantee the surface quality of the longitudinal weld before welding. Summary of the Invention

[0005] To address the problem of low yield rates in continuous tube welding due to welding defects such as porosity caused by dust and moisture on the plate surface, which can lead to the scrapping of the entire tube, this invention provides a preheating and dust removal device and method for continuous tube welding. This method ensures high cleanliness in the weld area while maintaining the preheating temperature of the welded tube, reducing thermal stress in the weld, increasing the weldability of special alloys, expanding the range of materials that can be selected for continuous tubes, and significantly increasing the yield rate of continuous tubes, thereby ensuring the development of special alloy continuous tubes.

[0006] The technical solution of this invention is as follows: a preheating and dust removal device for continuous pipe welding, installed at the pipe inlet end of a forming unit for continuous pipe welding, wherein the pipe outlet end of the forming unit is provided with a longitudinal weld head, including a base and a temperature control cabinet, wherein two sets of grinding dust removal sections, a preheating section, and a first temperature measuring thermocouple are sequentially arranged on the base, the first temperature measuring thermocouple being electrically connected to the temperature control cabinet, and the grinding dust removal section including multiple grinding dust removal section bases, each of the grinding dust removal section bases being provided with grinding tools. The dust removal unit support frame has two grinding support surfaces, and a grinding disc pasting plate is provided in the middle of the two grinding support surfaces. The preheating unit includes multiple preheating unit bases, and preheating unit support legs are provided on the multiple preheating unit bases. Fastening strips are provided on the preheating unit support legs, and upper induction coil shells and lower induction coil shells are respectively connected to the fastening strips. A preheating unit opening is provided at the connection between the upper induction coil shells and the lower induction coil shells. Induction coils are provided inside the upper induction coil shells and the lower induction coil shells.

[0007] The base includes multiple base support legs, and a base platform is provided on the base support legs. The end of the base platform away from the forming unit is provided with multiple chip discharge holes at the lower part of the grinding and dust removal section.

[0008] Below the chip removal hole is a grinding fluid discharge buffer drawer, below which is a circulating water tank. Above the chip removal hole is a grinding dust removal section with a cooling water tap. The cooling water tap is connected to the circulating water tank via a hose, and the hose passes through a cooling water tap mounting hole located on the base platform.

[0009] Multiple grinding support table latches are provided between the two grinding support table surfaces on the side of the pipe inlet end and multiple support table hinges are provided on the side of the pipe outlet end. The pivot size of the support table hinges is the same as the thickness of the plate. Spring hooks are provided on both sides of the two grinding support table surfaces perpendicular to the pipe inlet end and outlet end, and support springs are connected to the spring hooks.

[0010] A second temperature measuring thermocouple is provided at the pipe outlet end of the forming unit and the pipe inlet end of the longitudinal weld head.

[0011] The base platform is located near one end of the molding unit. A first temperature measuring thermocouple is provided at the outlet end of the preheating section. A first temperature measuring thermocouple mounting hole is provided at the connection between the first temperature measuring thermocouple and the base platform.

[0012] The upper and lower induction coil shells, when connected, form a hollow square spiral shape.

[0013] A groove is provided below the grinding disc adhesive plate in the middle of the two grinding support surfaces, and sponge sandpaper is placed in the groove.

[0014] A method for preheating and dust removal before welding continuous tube welding, using any of the above-described preheating and dust removal equipment for continuous tube welding, includes the following steps: S1: The continuous steel strip first enters the grinding and dust removal section, where the surface of the sheet is cleaned of dust and ground. S2: After the continuous steel strip leaves the grinding and dust removal section, it enters the preheating section. The induction coil heats the plate, and the temperature is continuously fed back to the temperature control cabinet through the first temperature measuring thermocouple for adjustment, so as to realize online preheating and dust removal.

[0015] The technical advantages of this invention are as follows: 1. This invention uses a hollow induction heating preheating section, which can ensure online preheating of the continuous tube and dry the surface of the continuous tube while ensuring the preheating of the plate; 2. This invention connects to a first temperature measuring thermocouple through a temperature control cabinet, and continuously senses and adjusts the temperature, ensuring the accuracy of the preheating temperature before welding while ensuring the preheating of the weld seam; 3. This invention grinds the plate through a grinding dust removal section, and the steel strip surface is cooled by water cooling through water pipes during the grinding process, which can prevent the generation of a large amount of heat from friction and cause thermal damage to the workpiece; 4. This invention uses a hinge with a pivot size that is the same as the thickness of the plate to adjust the opening of the plate. After adjusting to the corresponding position, a spring of appropriate length is selected to determine the grinding thickness of the plate. The spring applies a certain pressure to the plate, thereby achieving the purpose of grinding dust removal. The spring ensures the distance between the two plate surfaces, thereby ensuring a reduction in the amount of grinding.

[0016] The following will provide further explanation in conjunction with the accompanying drawings. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a preheating and dust removal device for continuous pipe welding according to an embodiment of the present invention.

[0018] Figure 2 This is a schematic diagram of the base structure of a preheating and dust removal device for continuous pipe welding according to an embodiment of the present invention.

[0019] Figure 3 This is a schematic diagram of the plate entry end structure of the plate grinding and cooling section of a preheating and dust removal equipment for continuous pipe welding according to an embodiment of the present invention.

[0020] Figure 4 This is a schematic diagram of the plate grinding and cooling section of a plate separation end in a preheating and dust removal equipment for continuous pipe welding, according to an embodiment of the present invention.

[0021] Figure 5 This is an embodiment of the present invention. Figure 4 Enlarged schematic diagram of structure A in the middle.

[0022] Figure 6 This is a schematic diagram of the preheating section of a plate material in a preheating and dust removal equipment for continuous pipe welding, according to an embodiment of the present invention.

[0023] Figure 7 This is a schematic diagram of the temperature control process of a temperature control cabinet for a preheating and dust removal equipment used in continuous tube welding according to an embodiment of the present invention.

[0024] Reference numerals: 1-Base, 2-Grinding dust removal section, 3-Preheating section, 4-Temperature control cabinet, 5-Circulating water tank, 6-Cooling water tap, 7-First temperature measuring thermocouple, 8-Second temperature measuring thermocouple, 9-Forming unit, 10-Longitudinal weld seam welding head, 11-Base support leg, 12-Base table, 13-Chip removal hole, 14-Grinding fluid discharge buffer drawer, 15-Cooling water tap mounting hole, 16-First temperature measuring thermocouple mounting hole 21-Grinding dust removal unit base, 22-Grinding dust removal unit support frame, 23-Grinding support table, 24-Grinding disc adhesive plate, 25-Grinding support table lock, 26-Support spring, 27-Support table hinge, 28-Groove, 29-Spring hook, 31-Preheating unit base, 32-Preheating unit support leg, 33-Fastening strip, 34-Upper induction coil housing, 35-Preheating unit opening, 36-Lower induction coil housing. Detailed Implementation

[0025] Example 1 like Figure 1 , Figure 3 , Figure 6 As shown, a preheating and dust removal device for continuous pipe welding is installed at the pipe inlet end of a forming unit 9 for continuous pipe welding. The forming unit 9 has a longitudinal weld head 10 at its pipe outlet end. The device includes a base 1 and a temperature control cabinet 4. The base 1 has two sets of grinding and dust removal sections 2, a preheating section 3, and a first temperature measuring thermocouple 7 arranged sequentially. The first temperature measuring thermocouple 7 is electrically connected to the temperature control cabinet 4. The grinding and dust removal section 2 includes multiple grinding and dust removal section bases 21, each of which has a grinding and dust removal section support frame 22. The dust support frame 22 is provided with two grinding support surfaces 23. A grinding disc pasting plate 24 is provided in the middle of the two grinding support surfaces 23. The preheating part 3 includes multiple preheating part bases 31. Each of the multiple preheating part bases 31 is provided with a preheating part support leg 32. A fastening strip 33 is provided on the preheating part support leg 32. An upper induction coil shell 34 and a lower induction coil shell 36 are respectively connected to the fastening strip 33. A preheating part opening 35 is provided at the connection between the upper induction coil shell 34 and the lower induction coil shell 36. An induction coil is provided inside the upper induction coil shell 34 and the lower induction coil shell 36.

[0026] In actual use, the continuous steel strip first enters the grinding and dust removal section 2, where the surface of the plate is cleaned and ground. After leaving the grinding and dust removal section 2, the continuous steel strip enters the preheating section 3, where an induction coil heats the plate. Before use, the lower induction coil housing 36 is installed in the preheating section 3, followed by the induction coil, with the lower half of the coil entering the lower induction coil housing 36. Finally, the upper induction coil housing 34 is installed, covering the upper half of the coil. The temperature is continuously fed back to the temperature control cabinet 4 via the first temperature-sensing thermocouple 7 for adjustment, achieving online preheating and dust removal. This invention uses a hollow induction heating preheating section, which ensures online preheating of the continuous tube and dries the surface of the continuous tube while preheating the plate. The invention connects to the first temperature-sensing thermocouple via the temperature control cabinet, continuously feeding back and adjusting the temperature, ensuring accurate preheating temperature before welding while ensuring weld preheating.

[0027] Example 2 Preferably, based on Example 1, in this example, as Figure 2 As shown, the base 1 includes multiple base support legs 11, and a base platform 12 is provided on the base support legs 11. The end of the base platform 12 away from the forming unit 9 is provided with multiple chip discharge holes 13 at the lower part of the grinding and dust removal section 2.

[0028] In actual use, the end of the base table 12 away from the forming unit 9 is provided with multiple chip discharge holes 13 at the lower part of the grinding dust removal section 2. The chip discharge holes 13 ensure that the cooling water for cooling the grinding dust removal section 2 can flow down quickly, ensuring that the base table 12 is clean and tidy.

[0029] Example 3 Preferably, based on Embodiment 1 or Embodiment 2, in this embodiment, a grinding fluid discharge buffer drawer 14 is provided below the chip discharge hole 13, a circulating water tank 5 is provided below the grinding fluid discharge buffer drawer 14, and a cooling water faucet 6 is provided on the grinding dust removal part 2 above the chip discharge hole 13. The cooling water faucet 6 is connected to the circulating water tank 5 through a hose, and a cooling water faucet mounting hole 15 is provided where the hose passes through the base platform 12.

[0030] In actual use, a grinding fluid discharge buffer drawer 14 is provided below the chip discharge hole 13, and a circulating water tank 5 is provided below the grinding fluid discharge buffer drawer 14. A cooling water tap 6 is provided in the grinding dust removal part 2 above the chip discharge hole 13. The grinding fluid discharge buffer drawer 14 is made of PVC material and is installed by bolts. The grinding fluid discharge buffer drawer 14 is installed on the base 1 through the slide rail. The cooling water tap 6 is connected to the circulating water tank 5 through a hose, and the hose is fastened to the cooling water tap mounting hole 15 with rubber.

[0031] Example 4 Preferably, based on Example 1 or Example 3, such as Figure 4 , Figure 5 As shown, in this embodiment, multiple grinding support table latches 25 are provided between the two grinding support table surfaces 23 on the side of the pipe inlet end, and multiple support table movable hinges 27 are provided on the side of the pipe outlet end. The pivot size of the support table movable hinges 27 is the same as the thickness of the plate. Spring hooks 29 are provided on both sides of the two grinding support table surfaces 23 perpendicular to the pipe inlet end and outlet end, respectively. Support springs 26 are connected to the spring hooks 29.

[0032] In actual use, the pivot size of the movable hinge 27 of the support table is the same as the thickness of the plate. The opening of the plate is adjusted. After being adjusted to the corresponding position, the support springs 26 of the corresponding length on both sides are selected to determine the grinding thickness of the plate. The support springs 26 apply a certain pressure to the plate, thereby achieving the purpose of grinding and dust removal. The support springs 26 ensure the distance between the two grinding support tables 23, thereby ensuring the grinding amount of the grinding dust removal part 2.

[0033] Example 5 Preferably, based on Embodiment 1 or Embodiment 4, in this embodiment, a second temperature measuring thermocouple 8 is provided at the pipe outlet end of the forming unit 9 and the pipe inlet end of the longitudinal weld head 10.

[0034] In actual use, a second temperature measuring thermocouple 8 is provided at the pipe outlet end of the forming unit 9 and the pipe inlet end of the longitudinal weld head 10 to facilitate monitoring of the temperature of the pipe entering the longitudinal weld head 10.

[0035] Example 6 Preferably, based on Embodiment 1 or Embodiment 5, in this embodiment, the base platform 12 is located near one end of the molding unit 9, and a first temperature measuring thermocouple 7 is provided at the outlet end of the preheating section 3. A first temperature measuring thermocouple mounting hole 16 is provided at the connection between the first temperature measuring thermocouple 7 and the base platform 12.

[0036] In actual use, a first temperature measuring thermocouple 7 is provided at the outlet end of the preheating section 3 to facilitate the detection of the preheating temperature of the preheating section 3 and ensure that the processing requirements are met.

[0037] Example 7 Preferably, based on Embodiment 1 or Embodiment 6, in this embodiment, the upper induction coil shell 34 and the lower induction coil shell 36 are connected in a hollow square spiral shape.

[0038] In actual use, the upper induction coil shell 34 and the lower induction coil shell 36 are connected to form a hollow square spiral shape, which facilitates the placement of the induction coil inside.

[0039] Example 8 Preferably, based on Embodiment 1 or Embodiment 7, in this embodiment, a groove 28 is provided below the grinding disc pasting plate 24 in the middle of the two grinding support table surfaces 23, and sponge sandpaper is provided in the groove 28.

[0040] In actual use, a groove 28 is provided below the grinding disc pasting plate 24 in the middle of the two grinding support table surfaces 23. The groove 28 is provided with sponge sandpaper to facilitate grinding of the board. If the board is clean enough or the board itself does not need to be ground, a dry or wet cloth can be placed in the groove 28 for cleaning.

[0041] Example 9 A method for preheating and dust removal before welding continuous tube welding, using any of the above-described preheating and dust removal equipment for continuous tube welding, includes the following steps: S1: The continuous steel strip first enters the grinding and dust removal section 2, where the grinding and dust removal section 2 removes dust and grinds the surface of the plate. S2: After the continuous steel strip leaves the grinding and dust removal section 2, it enters the preheating section 3. The induction coil heats the plate, and the temperature is continuously fed back to the temperature control cabinet 4 through the first temperature measuring thermocouple 7 for adjustment, so as to realize online preheating and dust removal.

[0042] like Figure 7 As shown in the diagram, the temperature control cabinet temperature 7 control process is as follows: the signal acquisition system of the temperature control cabinet temperature 7 originates from the first temperature measuring thermocouple 7. The acquired temperature of the first temperature measuring thermocouple 7 is compared with the input signal, and the signal comparison result is transmitted to the signal processor for signal processing. The signal processor feeds back to the temperature control cabinet temperature 7 based on the temperature difference, continuous tube production speed, and temperature transmission speed to adjust the temperature of the induction coil. The induced temperature is controlled by the induced current. After a certain adjustment period of 20 seconds, the temperature control cabinet temperature 7 continuously feeds back the temperature of the first temperature measuring thermocouple 7 to the temperature control system, performing multiple signal acquisitions and comparisons to achieve the effect of heating or lowering the temperature, so that the temperature measured by the first temperature measuring thermocouple is the same as the required preset temperature, thereby achieving the effect of the preheating temperature before welding being consistent with the set temperature.

[0043] Example 10 This invention discloses a preheating and dust removal device and method for continuous tube welding. Continuous tubes of 5083 aluminum alloy with a wall thickness of 4.0 mm and in the H14 temper (work hardened + de-attraction annealed) are prepared. Continuous tubes with an outer diameter of 50.8 mm * 4.0 mm are welded. The preheating temperature is 150°C. Production practice shows that the weld quality of direct welding on the aluminum alloy anodized film is worse than that of welding on the aluminum alloy substrate after removing the anodized film. Therefore, to improve the welding quality of 5083 aluminum alloy, the anodized film on the aluminum alloy surface must be removed by grinding before welding.

[0044] Since the gap between the upper and lower grinding support tables 23 of the grinding dust removal section 2 is 10mm and the continuous tube wall thickness is 4.0mm, friction plates are pasted in the middle area of ​​the grinding plate pasting plate 24, and 2.9mm friction plates are used for grinding. A pair of 2.9mm die friction plates are selected and pasted on the grinding surface for friction. The pad thickness is 0.09mm. The width of the area of ​​the grinding support table 23 is 10mm. A 1000um grinding wheel is fixed on the grinding support table 23 to grind and brighten the aluminum alloy surface. Adjust the speed of the equipment to meet the speed of the welding head, and use a speed of 1-4m / min for welding. Since aluminum alloy is a non-magnetic product, select a 35mm*5mm copper coil and install it into the upper induction coil shell 34 and lower induction coil shell 36 in the preheating section 3, and fix the upper and lower surfaces with bolts. In the tube forming area, use a 600℃ forming roller instead of a conventional forming roller. After straightening, the aluminum alloy sheet enters the grinding and dust removal section 2, where a 0.1mm area on the aluminum alloy surface is ground. Water cooling is used to cool the aluminum alloy surface to be welded. The sheet then enters the preheating section 3, where the heating zone temperature is 300℃ and the induction coil length is 1000mm. After entering the induction coil, the water vapor on the aluminum alloy surface is evaporated. The dried sheet then enters the forming area for deformation. Since there is a certain distance between the forming area and the deformation area, the controller calculates the heating temperature based on this distance and the welding speed. After a trial run at a distance of 10 meters, the final heating temperature stabilizes. The first temperature measuring thermocouple 7 shows a preheating temperature of 150℃, and the second temperature measuring thermocouple shows a final heating temperature of 280℃. The precision of the whole tube welding is high, realizing the production of 5083 aluminum alloy continuous tubes.

[0045] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A preheating and dust removal device for continuous pipe welding, installed at the pipe inlet end of a forming unit (9) for continuous pipe welding, wherein the pipe outlet end of the forming unit (9) is provided with a longitudinal weld head (10), characterized in that: The system includes a base (1) and a temperature control cabinet (4). The base (1) is sequentially equipped with two sets of grinding dust removal sections (2), a preheating section (3), and a first temperature measuring thermocouple (7). The first temperature measuring thermocouple (7) is electrically connected to the temperature control cabinet (4). The grinding dust removal section (2) includes multiple grinding dust removal section bases (21). Each grinding dust removal section base (21) is equipped with a grinding dust removal section support frame (22). The grinding dust removal section support frame (22) has two grinding support surfaces (23). A grinding disc pasting plate (24) is located in the middle of the two grinding support surfaces (23). A groove (28) is provided below the grinding disc adhesive plate (24) in the middle of the grinding support table (23). Sponge sandpaper is provided in the groove (28). Multiple grinding support table latches (25) are provided between the two grinding support tables (23) on the side of the pipe inlet end and multiple support table hinges (27) are provided on the side of the pipe outlet end. The pivot size of the support table hinges (27) is the same as the thickness of the plate. Spring hooks (29) are provided on both sides of the two grinding support tables (23) perpendicular to the pipe inlet end and outlet end respectively. Support springs (26) are connected to the spring hooks (29). The preheating section (3) includes multiple preheating section bases (31), each preheating section base (31) is provided with a preheating section support leg (32), and each preheating section support leg (32) is provided with a fastening strip (33). An upper induction coil shell (34) and a lower induction coil shell (36) are respectively connected to the fastening strip (33). A preheating section opening (35) is provided at the connection between the upper induction coil shell (34) and the lower induction coil shell (36). An induction coil is provided inside the upper induction coil shell (34) and the lower induction coil shell (36). The base (1) includes multiple base support legs (11), and the base supports... The leg (11) is provided with a base platform (12). The end of the base platform (12) away from the forming unit (9) is provided with multiple chip removal holes (13) at the lower part of the grinding dust removal part (2). Below the chip removal holes (13) is a grinding fluid discharge buffer drawer (14). Below the grinding fluid discharge buffer drawer (14) is a circulating water tank (5). The grinding dust removal part (2) above the chip removal holes (13) is provided with a cooling water tap (6). The cooling water tap (6) is connected to the circulating water tank (5) through a hose. The hose passes through the base platform (12) and is provided with a cooling water tap mounting hole (15).

2. The preheating and dust removal equipment for continuous pipe welding according to claim 1, characterized in that: A second thermocouple (8) is provided at the pipe outlet end of the forming unit (9) and the pipe inlet end of the longitudinal weld head (10).

3. The preheating and dust removal equipment for continuous pipe welding according to claim 1, characterized in that: The base platform (12) is located near one end of the molding unit (9). A first temperature measuring thermocouple (7) is provided at the outlet end of the preheating section (3). A first temperature measuring thermocouple mounting hole (16) is provided at the connection between the first temperature measuring thermocouple (7) and the base platform (12).

4. The preheating and dust removal equipment for continuous pipe welding according to claim 1, characterized in that: The upper induction coil shell (34) and the lower induction coil shell (36) are connected to form a hollow square spiral shape.

5. A method for preheating and dust removal before welding continuous pipe, using a preheating and dust removal device for continuous pipe welding as described in any one of claims 1 to 4, characterized in that: Includes the following steps: S1: The continuous steel strip first enters the grinding and dust removal section (2), where the grinding and dust removal section (2) removes dust and grinds the surface of the plate. S2: After the continuous steel strip leaves the grinding and dust removal section (2), it enters the preheating section (3). The induction coil heats the plate material, and the temperature is continuously fed back to the temperature control cabinet (4) through the first temperature measuring thermocouple (7) for adjustment, so as to realize online preheating and dust removal.

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