Barrel body pipe joint welding method and barrel body pipe joint welding equipment

Abstract

The invention relates to the technical field of welding, and provides a barrel body pipe joint welding method and barrel body pipe joint welding equipment. The barrel body pipe joint welding method comprises the steps that a barrel body and a pipe joint are assembled and positioned, and the insertion end of the pipe joint is inserted into the barrel wall of the barrel body; the insertion end is divided into a plurality of welding sections in the circumferential direction of the pipe joint; according to the height difference between each welding section and the inner wall face of the barrel wall, welding parameters adopted by welding equipment for each welding section are set; and the welding gun head extends into the barrel body through the welding equipment, and laser welding is conducted on the multiple welding sections and the inner wall face of the barrel wall according to the welding parameters. According to the welding method, the gap between the pipe joint and the barrel wall can be eliminated, the height difference between the welding section and the barrel wall can be reduced or eliminated, meanwhile, the consistency of circumferential welding of the pipe joint is guaranteed, the coating quality of the coating in the barrel body is improved, the coating is prevented from cracking, and therefore the problems of corrosion and water leakage of the barrel body are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of welding, in particular to a barrel pipe joint welding method and barrel pipe joint welding equipment. Background Art

[0002] As a critical component of electric water heaters, the quality of the inner heater directly impacts the product's lifespan. Conventional inner heaters consist of a barrel, pipe fittings, wall mounts, flanges, and other components, assembled through welding. To enhance corrosion resistance, the inner heater is typically coated internally with a coating such as inorganic enamel or a composite coating. The pipe fittings, used for hot and cold water delivery or wastewater removal, typically penetrate the barrel and come into direct contact with the coating.

[0003] In the related technologies for welding electric heating liner and pipe joints, the two are either welded around the pipe joint outside the barrel using arc welding, or the pipe joint is welded to the outer surface of the barrel using resistance welding. After welding with either method, there is a gap between the pipe joint inserted into the barrel and the barrel body. This can easily lead to poor coating or cracking of the coating during subsequent coating, causing corrosion or leakage. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the related art. To this end, the present invention provides a barrel pipe joint welding method that can eliminate the gap between the pipe joint inserted into the barrel and the barrel, improve the coating quality of the barrel body, prevent the coating from cracking, and thus avoid barrel corrosion and water leakage.

[0005] The invention also provides a barrel pipe joint welding device.

[0006] The barrel body pipe joint welding method according to the first embodiment of the present invention comprises the following steps: Assemble and position the barrel body and the pipe joint so that the insertion end of the pipe joint is inserted into the barrel wall of the barrel body; Dividing the insertion end into a plurality of welding sections along the circumference of the pipe joint; Setting welding parameters for each welding section according to the height difference between each welding section and the inner wall surface of the barrel wall; The welding equipment performs laser welding on the plurality of welding segments and the inner wall surface according to the welding parameters.

[0007] According to an embodiment of the present invention, the barrel body pipe joint welding method divides the insertion end of the pipe joint into multiple welding sections along the circumference of the pipe joint, sets corresponding welding parameters according to the height difference between each welding section and the barrel wall, and then welds the pipe joint and the barrel body in sections according to the welding parameters. This welding method adjusts the welding parameters according to the height difference between the welding section and the barrel wall, enabling each welding section to smoothly transition to the barrel wall, eliminating the gap between the pipe joint and the barrel wall, and reducing or eliminating the height difference between the welding section and the barrel wall, thereby ensuring the consistency of the circumferential welding of the pipe joint. This avoids the gap and height difference between the pipe joint and the barrel wall causing poor coating or cracking of the coating when coating the inner wall surface, thereby improving the coating quality of the barrel body coating and avoiding the problems of barrel corrosion and water leakage. At the same time, welding the pipe joint and the barrel wall inside the barrel body can avoid the influence of the connection ends of the closely arranged pipe joints on the welding operation compared to external welding.

[0008] According to one embodiment of the present invention, the laser welding of the plurality of welding segments and the inner wall surface comprises: The welding gun head is controlled to sequentially perform laser welding on the plurality of welding segments and the inner wall surface along the circumferential direction.

[0009] According to one embodiment of the present invention, after the step of laser welding the plurality of welding segments and the inner wall surface according to the welding parameters, the method further includes: After the welding equipment controls the welding gun head to exit the barrel body, it controls the welding gun head to move along the first direction to another pair of the barrel body and the pipe joint that have completed the assembly and positioning, and extends the welding gun head into the interior of the barrel body, and repeats the steps of laser welding the multiple welding segments and the inner wall surface according to the welding parameters.

[0010] According to one embodiment of the present invention, during the laser welding process, the welding equipment uses a dust suction device to vacuum the welding area. According to one embodiment of the present invention, the welding parameters are welding power and / or welding time; and the step of setting the welding parameters used by the welding equipment for each welding segment based on the height difference between each welding segment and the barrel wall includes: For the welding section where the height difference is less than or equal to a first set value, setting the corresponding welding parameter as a first welding parameter; For the welding section where the height difference is greater than the first set value and less than or equal to the second set value, the corresponding welding parameter is set to a second welding parameter; wherein the second welding parameter is greater than the first welding parameter.

[0011] According to one embodiment of the present invention, the barrel wall is a cylindrical barrel wall, and the plurality of welding segments include a first welding segment, a second welding segment, a third welding segment, and a fourth welding segment sequentially connected along the circumferential direction; The height difference between the first welding section and the third welding section and the barrel wall is less than or equal to the first set value, and the height difference between the second welding section and the fourth welding section and the barrel wall is greater than the first set value and less than or equal to the second set value.

[0012] According to one embodiment of the present invention, the step of sequentially laser welding the plurality of welding segments to the barrel wall along the circumferential direction includes: the welding equipment performs oscillating welding with a laser beam having a core diameter greater than or equal to 200 μm.

[0013] The barrel pipe joint welding device according to the second embodiment of the present invention is applied to any of the above barrel pipe joint welding methods, including: Drive device; a cantilever bracket, one end of the cantilever bracket being fixed to the driving end of the driving device, and the driving device being used to drive the cantilever bracket to move in three-dimensional space; A welding mechanism, wherein a welding gun head of the welding mechanism is installed at the other end of the cantilever bracket; A positioning tool assembly, used for assembling and positioning the barrel body and the pipe joint; The control device is communicatively connected to the driving device and the welding mechanism.

[0014] According to one embodiment of the present invention, the driving device includes a first driving mechanism, a second driving mechanism and a third driving mechanism connected in sequence, the first driving mechanism is used to drive the second driving mechanism to move along the first direction, the second driving mechanism is used to drive the third driving mechanism to move along the second direction, the driving end is provided on the third driving mechanism, and the third driving mechanism is used to drive the cantilever bracket to move along the third direction.

[0015] According to one embodiment of the present invention, the first direction and the third direction are horizontal directions perpendicular to each other, the second direction is a vertical direction, and the axis of the barrel is along the third direction; The cantilever bracket includes a first connecting portion and a second connecting portion connected to each other, the first connecting portion is arranged along the second direction, the second connecting portion is arranged along the third direction, and the welding mechanism is installed on the second connecting portion.

[0016] According to one embodiment of the present invention, the barrel body pipe joint welding equipment is provided with a plurality of welding stations, the plurality of welding stations are arranged along the first direction, and each of the welding stations is provided with the positioning tooling assembly.

[0017] According to one embodiment of the present invention, the positioning tool assembly includes: a first positioning fixture and a second positioning fixture, wherein the second positioning fixture is located above the first positioning fixture and can be moved closer to or farther away from the first positioning fixture in a vertical direction, and the barrel can be clamped between the first positioning fixture and the second positioning fixture; The third positioning tool is located below the second positioning tool and is provided with a positioning seat for positioning the pipe joint.

[0018] According to one embodiment of the present invention, the side of the first positioning fixture facing the second positioning fixture is conformally arranged with the outer wall surface of the barrel body, and the side of the second positioning fixture facing the first positioning fixture is conformally arranged with the outer wall surface of the barrel body.

[0019] According to one embodiment of the present invention, the third positioning tool is further provided with a lifting mechanism, and the pipe joint can be separated from the positioning seat under the action of the lifting mechanism.

[0020] According to one embodiment of the present invention, the third positioning fixture is further provided with a clamping mechanism, and the clamping mechanism includes a first clamping portion and a second clamping portion that are arranged opposite to each other, and the pipe joint can be clamped between the first clamping portion and the second clamping portion.

[0021] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 The present invention is a flow chart of a barrel pipe joint welding method according to an embodiment of the present invention.

[0024] Figure 2 It is a schematic diagram of the distribution of welding sections in the barrel pipe joint welding method provided by an embodiment of the present invention.

[0025] Figure 3 It is a structural schematic diagram of the barrel pipe joint welding equipment provided by an embodiment of the present invention.

[0026] Figure 4 It is a welding schematic diagram of a welding gun head of a barrel pipe joint welding device provided in an embodiment of the present invention.

[0027] Figure 5 This is a schematic diagram of the positional relationship between the third positioning tool and the barrel body of the barrel pipe joint welding equipment provided by an embodiment of the present invention.

[0028] Reference numerals: 1. Driving device; 11. First driving mechanism; 111. First driving member; 112. First guide rail; 12. Second driving mechanism; 121. Second driving member; 122. Second guide rail; 13. Third driving mechanism; 131. Third driving member; 132. Third guide rail; 2. Cantilever bracket; 21. First connecting portion; 22. Second connecting portion; 3. Positioning fixture assembly; 31. First positioning fixture; 312. First positioning block; 32. Second positioning fixture ; 321. Crossbeam; 322. Second positioning block; 33. Third positioning tool; 331. Positioning seat; 332. Lifting mechanism; 4. Welding gun head; 41. First main body; 42. Second main body; 43. Laser beam; 51. Equipment platform; 52. Mounting frame; 521. First frame; 522. Second frame; 6. Barrel; 7. Pipe joint; 71. First welding section; 72. Second welding section; 73. Third welding section; 74. Fourth welding section. DETAILED DESCRIPTION

[0029] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0030] In the description of the embodiments of the present invention, it should be noted that the terms "upper," "lower," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the embodiments of the present invention. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the embodiments of the present invention. Furthermore, the terms "first" through "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] In describing the embodiments of the present invention, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention based on the specific circumstances.

[0032] In the embodiments of the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," or "above" a second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," or "below" a second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0033] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0034] like Figure 1 As shown, the barrel body pipe joint welding method provided by the embodiment of the present invention includes the following steps.

[0035] In step S100 , the barrel body 6 and the pipe joint 7 are assembled and positioned so that the insertion end of the pipe joint 7 is inserted into the barrel wall of the barrel body 6 .

[0036] Step S200 : dividing the insertion end of the pipe joint 7 into a plurality of welding segments along the circumference of the pipe joint 7 .

[0037] Step S300 , setting welding parameters for each welding section adopted by the welding equipment according to the height difference between each welding section and the inner wall surface of the barrel wall.

[0038] In step S400 , the welding equipment inserts the welding gun head into the interior of the barrel body 6 and performs laser welding on the multiple welding segments and the inner wall surface of the barrel wall according to the welding parameters.

[0039] This barrel pipe joint welding method is used to weld a pipe joint 7 to the barrel wall of a barrel body 6. The barrel body 6 can be the electric heating inner tank of an electric water heater, or it can be an enamel water tank, a stainless steel water tank, etc. The barrel wall of the barrel body 6 is provided with a mounting hole, and the pipe joint 7 is provided with an insertion end and a connection end. The insertion end of the pipe joint 7 is inserted into the mounting hole, and the connection end is located outside the barrel body 6 for connecting to a water pipe.

[0040] The end surface of the insertion end of pipe connector 7 is flat, while the inner surface of the barrel wall of barrel body 6 is typically non-flat, such as a spherical or curved surface. Therefore, the end surface of the insertion end is not flush with the barrel wall. Instead, there is a varying height difference between the insertion end and the barrel wall along the circumference of pipe connector 7. This height difference is the height difference between the insertion end and the barrel wall. Some height differences are caused by the insertion end protruding from the inner surface of the barrel wall, while others are caused by the insertion end being lower than the inner surface of the barrel wall. The distribution of the height difference along the circumference of pipe connector 7 is related to the outer shape of the barrel wall.

[0041] In practical applications, the insertion end of the pipe joint 7 can be divided into multiple welding segments along the circumference of the pipe joint 7 based on the distribution of height differences along the circumference of the pipe joint 7. Each welding segment is an arc-shaped segment, and the height difference between each position on the arc-shaped segment and the barrel wall should be within a corresponding height difference range. This is equivalent to setting the welding parameters corresponding to each welding segment based on the height difference range between each welding segment and the barrel wall. That is, different height difference ranges correspond to different welding parameters.

[0042] The welding parameters for each weld segment are set to ensure a smooth transition between the weld segment and the barrel wall. Specifically, the welding equipment welds the barrel wall and the corresponding weld segment according to the specified welding parameters, reducing or eliminating the height difference between the weld segment and the barrel wall while also eliminating any gaps between the pipe joint 7 and the barrel wall. After the welding parameters for each weld segment are determined, they are input into the welding equipment's control system. The control system controls the welding gun head to extend into the barrel body 6 and then, based on the welding parameters, laser weld the weld segments to the barrel wall.

[0043] The barrel body pipe joint welding method provided by an embodiment of the present invention divides the insertion end of the pipe joint 7 into multiple welding segments along the circumference of the pipe joint 7, sets corresponding welding parameters based on the height difference between each welding segment and the barrel wall, and then welds the pipe joint 7 and the barrel body 6 in sections according to the welding parameters. This welding method adjusts the welding parameters based on the height difference between the welding segment and the barrel wall, enabling each welding segment to smoothly transition to the barrel wall, eliminating gaps between the pipe joint 7 and the barrel wall, and reducing or eliminating the height difference between the welding segment and the barrel wall, thereby ensuring the consistency of the circumferential welding of the pipe joint 7. This avoids poor coating or cracking of the coating caused by the gap and height difference between the pipe joint and the barrel wall when coating the inner wall surface, thereby improving the coating quality of the barrel body, and thus avoiding problems such as corrosion and water leakage of the barrel body. Furthermore, welding the pipe joint 7 to the barrel wall inside the barrel body 6 can avoid the influence of the closely arranged connection ends of the pipe joint 7 on the welding operation compared to external welding.

[0044] In the related art, arc welding requires welding the pipe joints 7 to the barrel wall on the outside of the barrel body 6 due to the high heat input. To avoid spatter damage to the liner coating, arc welding can cause severe heat loss to the base material due to the close arrangement of the pipe joints 7, resulting in significant deformation of the barrel body 6 and poor mechanical properties. Furthermore, spatter generated during the welding process can easily damage the threads of the pipe joints 7, affecting the sealing connection between the pipe joints 7 and other parts. Resistance welding can only weld the pipe joints 7 to the barrel wall on the outside of the barrel body 6. To ensure good contact between the two, the weld area of the barrel wall must be flattened, which increases the production process. Resistance welding can also easily cause localized cold welds, and weld quality cannot be promptly identified and confirmed. In the embodiment of the present invention, laser welding is performed on the pipe joint 7 and the barrel wall inside the barrel body 6. Compared with arc welding, this can avoid damage to the coating or the thread of the pipe joint 7 caused by spatter, and avoid damage to the barrel body 6 caused by welding heat, thereby ensuring the mechanical properties of the barrel body 6. Compared with resistance welding, there is no need to flatten the barrel wall, which simplifies the process, and the welding quality is easy to identify and confirm, thereby avoiding batch defects.

[0045] The laser welding of the plurality of welding segments and the inner wall surface described in step S400 includes: controlling the welding gun head to sequentially laser weld the plurality of welding segments and the inner wall surface of the barrel wall along the circumference of the pipe joint 7 .

[0046] In step S100, the barrel body 6 and the pipe joint 7 can be positioned by the positioning tool assembly 3. For products of the same batch, multiple pairs of barrel bodies 6 and pipe joints 7 have the same specifications. After each pair of barrel bodies 6 and pipe joints 7 is positioned, the height difference range, distribution, and situation between each welding section and the barrel wall are basically fixed.

[0047] Before laser welding, welding parameters are set for each weld segment based on the height difference between the weld segments and the inner wall of the barrel, and a welding path is determined. The welding path can be a clockwise or counterclockwise circular path along the circumference of the pipe joint 7. The welding parameters and welding path information are input into the control system of the welding equipment to form a set welding program. The welding equipment then welds the weld segments to the barrel wall sequentially along the circumference of the pipe joint 7 according to the set welding program, which helps to achieve smoother and more continuous welds between adjacent weld segments.

[0048] Furthermore, after the laser welding of the plurality of welding segments and the inner wall surface of the barrel wall according to the welding parameters in step S400, the method further includes the following steps: In step S500, after the welding equipment controls the welding gun head to exit the barrel body, it controls the welding gun head to move along the first direction to another pair of barrel bodies and pipe joints that have completed the assembly and positioning, and extends the welding gun head into the interior of the barrel body, and repeats the steps of laser welding multiple welding segments and the inner wall surface according to the welding parameters.

[0049] It is understood that multiple pairs of barrels 6 and pipe joints 7 are arranged along a first direction. After the welding equipment controls the welding gun head to enter the interior of one barrel, completes the internal welding of the first pair of barrels 6 and pipe joints 7, the welding equipment controls the welding gun head to withdraw from the barrel 6. The welding gun head is then controlled to move along the first direction to the second pair of barrels 6 and pipe joints 7, and extends into the interior of the barrel 6 to complete the welding of the second pair of barrels 6 and pipe joints 7.

[0050] Among them, one welding device can correspond to multiple pairs of barrels 6 and pipe joints 7 arranged in the first direction, such as Figure 3 As shown, a welding device is used to weld two pairs of barrel bodies 6 and pipe joints 7 arranged in a first direction. In actual production, when welding one pair of barrel bodies 6 and pipe joints 7, the positioning of another pair of barrel bodies 6 and pipe joints 7 can be performed simultaneously to improve production efficiency.

[0051] Furthermore, during the laser welding process, the welding equipment performs a dust suction operation on the welding area through a dust suction device.

[0052] Because welding occurs within a barrel, the confined space allows smoke and dust to easily adhere to the weld surface, affecting weld formation and quality, leading to defects such as porosity and slag inclusions, and reducing weld strength and sealing. Excessive smoke and dust trapped within the barrel can interfere with laser beam transmission and focusing, affecting the stability and accuracy of laser welding. This embodiment utilizes a dust extraction device to remove dust during welding, improving weld quality and ensuring process stability while also ensuring a clean interior and preventing air pollution.

[0053] In this embodiment of the present invention, the welding parameters include welding power and / or welding duration. In step S300, the process includes: for welding segments where the height difference is less than or equal to a first set value, setting the corresponding welding parameters to first welding parameters. For welding segments where the height difference is greater than the first set value and less than or equal to a second set value, setting the corresponding welding parameters to second welding parameters. The second welding parameters are greater than the first welding parameters.

[0054] It can be understood that for welding sections with smaller height differences, smaller welding power and / or shorter welding time are used; for welding sections with larger height differences, larger welding power and / or longer welding time are used to melt more metal to ensure that the welds at different welding sections have consistent shape and a smooth surface.

[0055] For example, if the welding parameter is welding power, the first welding power is used for welding sections with a height difference of less than 0.15mm, and the second welding power is used for welding sections with a height difference of more than 0.15mm but less than 0.25mm. The second welding power is 1%-3% higher than the first welding power. The same principle can be applied to welding duration.

[0056] For weld sections with large height differences, increasing the welding power without increasing the welding time can improve welding efficiency. Extending the welding time without increasing welding efficiency can reduce the heat-affected zone and heat accumulation in the weld area, avoiding porosity and improving weld quality. Of course, a comprehensive approach can also be adopted, appropriately increasing the welding power and extending the welding time to achieve a balance between welding efficiency and quality.

[0057] It will be appreciated that the second set value represents the maximum height difference between the insertion end of the pipe joint 7 and the barrel wall after the barrel body 6 and the pipe joint 7 are aligned and positioned. The above embodiment divides the height difference less than or equal to the second set value into two height difference ranges, and welds the barrel body 6 and the pipe joint 7 using two different welding parameters. Of course, the height difference ranges can be further refined to achieve more precise control of the welding parameters and further improve welding quality.

[0058] See also Figure 2 and Figure 3 In some embodiments of the present invention, the barrel wall is cylindrical, and the plurality of welded segments include a first welded segment 71, a second welded segment 72, a third welded segment 73, and a fourth welded segment 74, which are sequentially connected along the circumferential direction. The height difference between the first welded segment 71 and the third welded segment 73 and the barrel wall is less than or equal to a first set value, and the height difference between the second welded segment 72 and the fourth welded segment 74 and the barrel wall is greater than the first set value and less than or equal to a second set value.

[0059] Among them, the mounting hole of the cylindrical barrel wall presents a saddle-shaped intersection line. After the pipe joint 7 and the barrel body 6 are positioned, the height difference between the plug-in end of the pipe joint 7 and the barrel wall presents a regular distribution. According to its distribution, the plug-in end is divided into four welding sections along its circumference. The first welding section 71 and the third welding section 73 are arranged opposite to each other, and the height difference between the two and the barrel wall is small, so a smaller welding power and / or a shorter welding time can be used. The second welding section 72 and the fourth welding section 74 are arranged opposite to each other, and the height difference between the two and the barrel wall is large, so a larger welding power and / or a longer welding time can be used. After the counterclockwise or clockwise welding is completed, a smooth weld appears between the four welding sections and the barrel wall.

[0060] In some embodiments of the present invention, the step of sequentially laser welding the plurality of welding segments to the barrel wall along the circumferential direction includes: performing oscillating welding with a laser beam 43 having a core diameter greater than or equal to 200 μm using a welding device. It is understood that when the laser beam 43 of the welding device welds each point of the pipe joint 7, the welding is performed with a large spot size greater than or equal to 200 μm and along a preset oscillating trajectory, such as oscillating in a circular or figure-eight pattern, to increase the molten pool area, improve its bridging capability, reduce spatter during welding, and enhance gap adaptability.

[0061] The embodiment of the present invention further provides a barrel pipe joint welding device, which is applied to the barrel pipe joint welding method described in any of the above embodiments. Figure 3 As shown, the barrel body pipe joint welding equipment includes a driving device 1, a cantilever bracket 2, a positioning fixture assembly 3, a welding mechanism and a control device. One end of the cantilever bracket 2 is fixed to the driving end of the driving device 1, and the driving device 1 is used to drive the cantilever bracket 2 to move in three-dimensional space. The positioning fixture assembly 3 is used to assemble and position the barrel body 6 and the pipe joint 7. The welding gun head 4 of the welding mechanism is installed at the other end of the cantilever bracket 2. The driving device 1 and the welding mechanism are respectively connected to the control device for communication. Among them, the control device is used to control the driving device 1 to drive the welding gun head 4 to move, and is used to control the welding mechanism to weld multiple welding sections and the inner wall surface of the barrel wall according to welding parameters.

[0062] The steps of welding the barrel body pipe joint using the barrel body pipe joint welding equipment include: first, aligning and positioning the barrel body 6 and the pipe joint 7 by using the positioning tooling assembly 3 to ensure that the position of the pipe joint 7 relative to the barrel wall is consistent, and the multiple welding sections of the pipe joint 7 are respectively located within the corresponding height difference range; then, the control device controls the driving device 1 to move according to a preset program, so that the driving device 1 drives the cantilever bracket 2 to move in three-dimensional space, and extends the welding gun head 4 into the barrel body 6 through the cantilever bracket 2; then, the control device controls the welding mechanism to start, and at the same time controls the driving device 1 to drive the welding gun head 4 to move circumferentially around the pipe joint 7, so that the welding mechanism welds the multiple welding sections in sequence along the circumference of the pipe joint 7.

[0063] During the welding process, each time the laser beam 43 reaches a welding section, the control device adjusts the welding parameters of the welding mechanism, which are the welding power and / or welding duration. For example, in a welding section where the height difference is less than or equal to a first set value, the control device controls the welding mechanism to weld at a first welding power and / or a first welding duration; in a welding section where the height difference is greater than the first set value and less than or equal to a second set value, the control device controls the welding mechanism to weld at a second welding power and / or a second welding duration. The first welding power is less than the second welding power, and the first welding duration is less than the second welding duration. The barrel body pipe joint welding equipment uses the above-mentioned barrel body pipe joint welding method to produce a smooth weld between the barrel body 6 and the pipe joint 7, with high welding consistency.

[0064] The driving end of the driving device 1 has the freedom of movement in the first direction, the second direction and the third direction, and is used to drive the cantilever bracket 2 to move along the first direction, the second direction and the third direction.

[0065] See also Figure 3 In some embodiments of the present invention, the driving device 1 includes a first driving mechanism 11, a second driving mechanism 12, and a third driving mechanism 13 connected in sequence. The first driving mechanism 11 is used to drive the second driving mechanism 12 to move in a first direction, and the second driving mechanism 12 is used to drive the third driving mechanism 13 to move in a second direction. The driving end is provided at the third driving mechanism 13, and the third driving mechanism 13 is used to drive the cantilever support 2 to move in a third direction.

[0066] The barrel pipe joint welding device includes a mounting frame 52, and the driving device 1 is mounted on the mounting frame 52. The first driving mechanism 11, the second driving mechanism 12 and the third driving mechanism 13 can be linear driving modules.

[0067] Specifically, the first drive mechanism 11 includes a first drive member 111 and a first guide rail 112. The second drive mechanism 12 includes a second drive member 121 and a second guide rail 122. The third drive member 131 includes a third drive member 131 and a third guide rail 132. The first guide rail 112 extends along a first direction, the second guide rail 122 extends along a second direction, and the third guide rail 132 extends along a third direction. The first guide rail 112 is fixed to the mounting bracket 52, the second guide rail 122 is slidably mounted on the first guide rail 112, the first drive member 111 is fixedly coupled to the first guide rail 112 and is in driving connection with the second guide rail 122. The third guide rail 132 is slidably mounted on the second guide rail 122, the second drive member 121 is fixedly coupled to the second guide rail 122 and is in driving connection with the third guide rail 132. The cantilever support 2 is slidably mounted on the third guide rail 132, and the third drive member 131 is fixedly coupled to the third guide rail 132 and is in driving connection with the cantilever support 2. The three-dimensional drive device 1 formed by the first drive mechanism 11, the second drive mechanism 12 and the third drive mechanism 13 realizes the movement of the cantilever support 2 in three-dimensional space. Among them, the first drive member 111, the second drive member 121 and the third drive member 131 can be linear drive members such as motors or cylinders.

[0068] Conventional welding techniques for the joint 7 of an electric heating liner tube typically use a contouring mechanism or robot to weld the joint 7 to the outer circumference of the barrel 6. These actuators occupy a large space, are costly, and inflexible to operate. The present invention utilizes a drive device 1 with three translational degrees of freedom to drive a cantilever support 2, which in turn drives a welding gun head 4 into the barrel 6 for welding. This reduces overall space usage, simplifies operation, and reduces equipment cost.

[0069] Furthermore, the first direction and the third direction are horizontal directions perpendicular to each other, the second direction is a vertical direction, and the axis of the barrel 6 is along the third direction. Figure 4 The first direction is the X-axis direction, the second direction is the Z-axis direction, and the third direction is the Y-axis direction. The cantilever bracket 2 includes a first connecting portion 21 and a second connecting portion 22 connected to each other. The first connecting portion 21 is arranged along the second direction, and the second connecting portion 22 is arranged along the third direction. The welding mechanism is installed on the second connecting portion 22.

[0070] Specifically, see Figure 3 The first guide rail 112 is mounted horizontally on the mounting frame 52. The first drive mechanism 11 is used to drive the cantilever support 2 to move in a first direction on the horizontal plane. The third drive mechanism 13 is used to drive the cantilever support 2 to move in a third direction on the horizontal plane. The second drive mechanism 12 is used to drive the cantilever support 2 to rise and fall in the vertical direction. The first connecting portion 21 of the cantilever support 2 is arranged in the vertical direction, and the second connecting portion 22 is arranged in the second horizontal direction.

[0071] In this embodiment, the drive device 1 and the positioning fixture assembly 3 can be arranged vertically, with the drive device 1 positioned above the mounting bracket 52 and the positioning fixture assembly 3 positioned below the mounting bracket 52. After the barrel 6 is positioned, the barrel 6 is positioned below the mounting bracket 52, with the axis of the barrel 6 aligned along the third direction. The third drive mechanism 13 can drive the welding gun head 4 along the third direction and extend into the barrel 6.

[0072] Among them, such as Figure 4 As shown, the welding gun head 4 is an L-shaped welding gun head, which includes a first body portion 41 and a second body portion 42. The first body portion 41 is connected to the second connecting portion 22 of the cantilever bracket 2, and the first body portion 41 and the second connecting portion 22 are both extended along the third direction. The second body portion 42 is connected to the first body portion 41 and extends in a direction perpendicular to the first body portion, so that the end of the second body portion 42 away from the first body portion 41 can emit a laser beam 43 toward the barrel wall. The L-shaped welding gun head is driven by the cantilever bracket 2 to perform welding in the barrel body 6, which takes up little space. The welding gun head 4 has a large movable space, which is convenient for flexible operation. The welding mechanism can achieve oscillating welding of the laser beam 43 through the optical mechanism inside the welding gun head 4.

[0073] like Figure 3 As shown, the barrel body pipe joint welding equipment provided by some embodiments of the present invention is equipped with multiple welding stations, which are arranged along a first direction, and each welding station is provided with a positioning tool assembly 3. For example, the barrel body pipe joint welding equipment is equipped with two welding stations. While welding at one station, the barrel body 6 and the pipe joint 7 can be positioned and installed at the other station, which is conducive to improving welding efficiency. Of course, three or more welding stations can be set according to actual conditions. After completing the welding of a pair of barrel bodies 6 and pipe joints 7, the driving device 1 is reset and the welding gun head 4 is driven to move along the first direction through the first driving mechanism 11, and can be moved to the next pair of barrel bodies 6 and pipe joints 7. The equipment structure is simple and the welding stations are compact, which is conducive to reducing the space occupied by the equipment.

[0074] like Figure 3 As shown, in this embodiment of the present invention, the positioning fixture assembly 3 includes a first positioning fixture 31, a second positioning fixture 32, and a third positioning fixture 33. The second positioning fixture 32 is located above the first positioning fixture 31 and can be moved vertically closer to or further away from the first positioning fixture 31. The barrel 6 can be clamped between the first positioning fixture 31 and the second positioning fixture 32. The third positioning fixture 33 is located below the second positioning fixture 32 and is provided with a positioning seat 331 for positioning the pipe joint 7.

[0075] Specifically, the first positioning fixture 31 and the second positioning fixture 32 are arranged opposite to each other in the vertical direction, and are used to be arranged on the upper and lower sides of the barrel body 6. The positioning seat 331 can be provided with a positioning groove adapted to the pipe joint 7. When positioning the pipe joint 7, the pipe joint 7 can be directly inserted into the positioning groove.

[0076] To assemble and position the barrel body 6 and the pipe joint 7, first install the pipe joint 7 on the positioning seat 331 of the third positioning fixture 33. Then, after moving the second positioning fixture 32 upward a certain distance, the barrel body 6 is positioned on the first positioning fixture 31, inserting the pipe joint 7 into the barrel body 6. The second positioning fixture 32 is then pressed downward, clamping the barrel body 6 between the first positioning fixture 31 and the second positioning fixture 32. After welding is complete, the second positioning fixture 32 is moved upward to proceed with blanking.

[0077] Furthermore, there can be multiple third positioning fixtures 33 , which correspond one-to-one to the multiple mounting holes on the barrel body 6 and can be used to simultaneously position multiple pipe joints 7 to achieve welding of the multiple pipe joints 7 .

[0078] Furthermore, the positioning tool assembly 3 also includes a limit block, which is used to cooperate with the barrel body 6 in the axial upper limit position of the barrel body 6 to assist the axial positioning of the barrel body 6.

[0079] Furthermore, the side of the first positioning fixture 31 facing the second positioning fixture 32 is conformally arranged with the outer wall surface of the barrel body 6 , and the side of the second positioning fixture 32 facing the first positioning fixture 31 is conformally arranged with the outer wall surface of the barrel body 6 .

[0080] It is understood that the first positioning fixture 31 has a first positioning surface that conforms to the barrel body 6, and the second positioning fixture 32 has a second positioning surface that conforms to the barrel body 6, with the first positioning surface and the second positioning surface being arranged opposite each other. For example, the barrel body 6 is a cylindrical barrel body 6, and the outer surface of the barrel wall is a circular arc surface. The first positioning surface and the second positioning surface are designed to conform to the barrel body 6, that is, the first positioning surface and the second positioning surface are circular arc surfaces that conform to the barrel wall.

[0081] When positioning the barrel body 6, the barrel body 6 can be placed on the first positioning fixture 31 first, and the first positioning surface is used to position the barrel body 6, and then the second positioning fixture 32 is pressed down to clamp the barrel body 6. Through the contour design, the first positioning fixture 31 and the second positioning fixture 32 are simple in structure and easy to position.

[0082] Specifically, the first positioning fixture 31 includes a plurality of first positioning members spaced apart along a third direction. The first positioning members include two first positioning blocks 312 spaced apart along the first direction. The two first positioning blocks 312 are disposed on either axial side of the barrel body 6. The first positioning blocks 312 are provided with a first arcuate positioning surface. The first arcuate positioning surfaces of the first positioning blocks 312 of the plurality of first positioning members form the first positioning surface. The second positioning fixture 32 includes a plurality of second positioning members spaced apart along the third direction. The second positioning members include a crossbeam 321 and second positioning blocks 322 connected to both ends of the crossbeam 321. The second positioning blocks 322 are provided with a second arcuate positioning surface. The second arcuate positioning surfaces of the second positioning blocks 322 of the plurality of second positioning members form the second positioning surface.

[0083] like Figure 3 As shown, the barrel pipe joint welding equipment provided by the embodiment of the present invention includes an equipment platform 51 and a mounting frame 52. The first positioning fixture 31 and the third positioning fixture 33 are installed on the equipment platform 51. The mounting frame 52 is fixed to the equipment platform 51, and the second positioning fixture 32 is slidably mounted on the mounting frame 52 along the vertical direction.

[0084] Specifically, the mounting frame 52 includes a first frame 521 fixed to the equipment platform 51. A fourth guide rail extending vertically is provided on the first frame 521, and the second positioning fixture 32 is slidably mounted on the fourth guide rail. A fourth drive element may be provided on the first mounting frame 52, connected to the second positioning fixture 32 and configured to drive the second positioning fixture 32 in a vertical direction. The fourth drive element may be communicatively connected to a control device to automatically raise and lower the second positioning fixture 32. The fourth drive element may be a linear drive element such as a motor or a cylinder.

[0085] Furthermore, the mounting frame 52 includes a second frame 522, which is located above the equipment platform 51. The first frame 521 is connected between the equipment platform 51 and the second frame 522. The first frame 521 can be a first plate arranged in a vertical direction, and the second frame 522 can be a second plate arranged in a horizontal direction. The drive device 1 is installed on the side of the second frame 522 away from the equipment platform 51, that is, on the upper side of the second frame 522.

[0086] Optionally, two accommodating spaces are formed between the mounting frame 52 and the equipment platform 51, and the first frame 521 is separated between the two accommodating spaces. Positioning tooling assemblies 3 are provided in both accommodating spaces to form two welding stations. Fourth guide rails are provided on the sides of the first frame 521 facing the two accommodating spaces.

[0087] Furthermore, if Figure 5As shown, the third positioning fixture 33 is further provided with a lifting mechanism 332 , and the pipe joint 7 can be separated from the positioning seat 331 under the action of the lifting mechanism 332 .

[0088] Specifically, the positioning seat 331 is provided with a positioning groove for positioning the pipe joint 7, and the bottom of the positioning groove is provided with a through hole. The lifting mechanism 332 includes a fifth driving member and a push rod. The fifth driving member is connected to the push rod and is used to drive the push rod to move in a vertical direction so as to pass through the through hole of the positioning seat 331 and push the pipe joint 7 upward.

[0089] The outer side of the pipe joint 7 is provided with a stopper surface that engages with the outer wall of the barrel body 6. During the assembly and positioning of the barrel body 6 and the pipe joint 7, after the barrel body 6 is positioned, the fifth drive member can be used to drive the push rod upward to push the pipe joint 7 so that its stopper surface contacts the barrel body 6, thereby ensuring that the relative positions of each pair of pipe joints 7 and the barrel body 6 are consistent. The fifth drive member can be a linear drive member such as a motor or a cylinder.

[0090] Furthermore, the third positioning fixture 33 is further provided with a clamping mechanism (not shown in the figure), which includes a first clamping portion and a second clamping portion that are arranged opposite to each other, and the pipe joint 7 can be clamped between the first clamping portion and the second clamping portion.

[0091] The clamping mechanism is mounted on the positioning seat 331 or the equipment platform 51. Optionally, the first clamping portion and the second clamping portion are rotatably connected, and an elastic member is connected between the first clamping portion and the second clamping portion. Under the action of the elastic member, the first clamping portion and the second clamping portion are moved closer to each other to clamp the pipe joint 7. Under the action of an external force, the first clamping portion and the second clamping portion are moved away from each other to release the pipe joint 7, overcoming the elastic force. Alternatively, the first clamping portion and the second clamping portion are connected to a clamping cylinder, which is used to move the first clamping portion and the second clamping portion closer to or farther from each other to achieve clamping and release of the pipe joint 7.

[0092] In the above embodiment, the welding gun head 4 is equipped with a dust suction device. When the welding mechanism welds the barrel 6 and the pipe joint 7, the dust suction device is used to suck the smoke generated by the welding.

[0093] Finally, it should be noted that the above embodiments are intended to illustrate the present invention only and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications, or equivalent substitutions of the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention and are intended to be encompassed by the claims of the present invention.

Claims

1. A barrel pipe joint welding method, characterized in that: Including steps: Assemble and position the barrel body (6) and the pipe joint (7) so that the insertion end of the pipe joint (7) is inserted into the barrel wall of the barrel body (6); Dividing the insertion end into a plurality of welding sections along the circumference of the pipe joint (7); Setting welding parameters for each welding section according to the height difference between each welding section and the inner wall surface of the barrel wall; The welding equipment extends the welding gun head into the interior of the barrel (6) and performs laser welding on the plurality of welding segments and the inner wall surface according to the welding parameters.

2. The barrel pipe joint welding method according to claim 1, characterized in that: The laser welding of the plurality of welding segments and the inner wall surface comprises: The welding gun head is controlled to sequentially perform laser welding on the plurality of welding segments and the inner wall surface along the circumferential direction.

3. The barrel pipe joint welding method according to claim 1, characterized in that: After the step of laser welding the plurality of welding segments and the inner wall surface according to the welding parameters, the method further includes: After the welding equipment controls the welding gun head to exit the barrel body (6), the welding gun head is controlled to move along the first direction to another pair of the barrel body (6) and the pipe joint (7) that have completed the positioning, and the welding gun head is extended into the interior of the barrel body (6), and the step of laser welding the multiple welding segments and the inner wall surface according to the welding parameters is repeatedly performed.

4. The barrel pipe joint welding method according to claim 1, characterized in that: During the laser welding process, the welding equipment performs a dust suction operation on the welding area through a dust suction device.

5. The barrel pipe joint welding method according to claim 1, characterized in that: The welding parameters are welding power and / or welding time; and the step of setting the welding parameters used by the welding equipment for each welding segment according to the height difference between each welding segment and the barrel wall includes: For the welding section where the height difference is less than or equal to a first set value, setting the corresponding welding parameter as a first welding parameter; For the welding section where the height difference is greater than the first set value and less than or equal to the second set value, the corresponding welding parameter is set to a second welding parameter; wherein the second welding parameter is greater than the first welding parameter.

6. The barrel pipe joint welding method according to claim 5, characterized in that: The barrel wall is a cylindrical barrel wall, and the plurality of welding sections include a first welding section (71), a second welding section (72), a third welding section (73), and a fourth welding section (74) that are sequentially connected along the circumferential direction; The height difference between the first welding section (71) and the third welding section (73) and the barrel wall is less than or equal to the first set value, and the height difference between the second welding section (72) and the fourth welding section (74) and the barrel wall is greater than the first set value and less than or equal to the second set value.

7. The barrel pipe joint welding method according to any one of claims 1 to 6, characterized in that: The step of sequentially laser welding the plurality of welding segments to the barrel wall along the circumferential direction includes: The welding equipment performs swing welding using a laser beam (43) with a core diameter greater than or equal to 200 μm.

8. A barrel pipe joint welding device, used in the barrel pipe joint welding method according to any one of claims 1 to 7, characterized in that: include: Driving device (1); A cantilever bracket (2), one end of the cantilever bracket (2) being fixed to a driving end of the driving device (1), and the driving device (1) being used to drive the cantilever bracket (2) to move in a three-dimensional space; A welding mechanism, wherein a welding gun head (4) of the welding mechanism is mounted on the other end of the cantilever bracket (2); A positioning tool assembly (3) for assembling and positioning the barrel body (6) and the pipe joint (7); A control device, the drive device (1) and the welding mechanism are respectively connected to the control device for communication.

9. The barrel pipe joint welding equipment according to claim 8, characterized in that: The driving device (1) comprises a first driving mechanism (11), a second driving mechanism (12) and a third driving mechanism (13) which are connected in sequence, wherein the first driving mechanism (11) is used to drive the second driving mechanism (12) to move along a first direction, the second driving mechanism (12) is used to drive the third driving mechanism (13) to move along a second direction, the driving end is provided at the third driving mechanism (13), and the third driving mechanism (13) is used to drive the cantilever bracket (2) to move along a third direction.

10. The barrel pipe joint welding equipment according to claim 9, characterized in that: The first direction and the third direction are horizontal directions perpendicular to each other, the second direction is a vertical direction, and the axis of the barrel (6) is along the third direction; The cantilever bracket (2) comprises a first connecting portion (21) and a second connecting portion (22) connected to each other, the first connecting portion (21) being arranged along the second direction, the second connecting portion (22) being arranged along the third direction, and the welding mechanism being mounted on the second connecting portion (22).

11. The barrel pipe joint welding equipment according to claim 9, characterized in that: The barrel body pipe joint welding equipment is provided with a plurality of welding stations, the plurality of welding stations are arranged along the first direction, and each of the welding stations is provided with the positioning tool assembly (3).

12. The barrel pipe joint welding equipment according to claim 8, characterized in that: The positioning tool assembly (3) comprises: a first positioning fixture (31) and a second positioning fixture (32), wherein the second positioning fixture (32) is located above the first positioning fixture (31) and can move closer to or farther away from the first positioning fixture (31) in a vertical direction, and the barrel (6) can be clamped between the first positioning fixture (31) and the second positioning fixture (32); The third positioning fixture (33) is located below the second positioning fixture (32) and is provided with a positioning seat (331) for positioning the pipe joint (7).

13. The barrel pipe joint welding equipment according to claim 12, characterized in that: The side of the first positioning fixture (31) facing the second positioning fixture (32) is conformally arranged with the outer wall surface of the barrel body (6), and the side of the second positioning fixture (32) facing the first positioning fixture (31) is conformally arranged with the outer wall surface of the barrel body (6).

14. The barrel pipe joint welding equipment according to claim 12, characterized in that: The third positioning fixture (33) is further provided with a lifting mechanism (332), and the pipe joint (7) can be separated from the positioning seat (331) under the action of the lifting mechanism (332).

15. The barrel pipe joint welding equipment according to claim 12, characterized in that: The third positioning fixture (33) is further provided with a clamping mechanism, the clamping mechanism comprising a first clamping portion and a second clamping portion arranged opposite to each other, and the pipe joint (7) can be clamped between the first clamping portion and the second clamping portion.

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