A tube sheet welding apparatus for heat exchanger production

Abstract

This invention relates to the field of welding equipment technology and discloses a tube sheet welding device for heat exchanger production. The device includes a roller mechanism mounted on a transverse partition mechanism. A lifting mechanism includes a base frame, a lifting frame, and a fixed frame. The fixed frame is located on one side of the transverse partition mechanism, and its bottom end is fixedly connected to the base frame. A baffle is provided on one side of the fixed frame, and fixed plates are fixedly connected to both sides of the bottom of the baffle. The fixed plates are fixed to the base frame by bolts. This invention moves the heat exchange tube along the roller mechanism, causing the roller mechanism to roll. When the heat exchange tube is inserted into the tube hole, the roller mechanism provides support, thus preventing the heat exchange tube from bending and avoiding misalignment of the contact area between the heat exchange tube and the tube sheet.

Description

Technical Field

[0001] This invention relates to the field of welding equipment, and more specifically, to a tube sheet welding apparatus for heat exchanger production. Background Technology

[0002] In the production of some large heat exchangers, heat exchange tubes are typically assembled onto a tube sheet first, followed by welding. This avoids the risk of frictional damage that can occur when directly inserting the heat exchange tubes into the heat exchanger. The tube sheet usually has arrayed tube holes. Due to the long length of the heat exchange tubes, the tube sheet is placed vertically using a fixing fixture. Then, the heat exchange tubes are inserted horizontally into the tube holes one by one. After the heat exchange tubes are assembled, an automatic welding device welds the tube sheet. Currently, electric arc welding is generally used, as this method is relatively stable when welding tube sheets and does not produce debris.

[0003] In the existing technology, when heat exchange tubes are assembled on tube holes, they are generally done manually. The heat exchange tubes are inserted into the tube holes one by one by the manual. The heat exchange tubes pass through the tube holes and then protrude a part. After all the heat exchange tubes are assembled on the tube sheet, the part of the heat exchange tubes protruding from the tube holes needs to be corrected to ensure that the part of the heat exchange tubes protruding from the tube holes is consistent. Finally, an arc welding robot welds the heat exchange tubes and the tube sheet together.

[0004] The inventors discovered that before the arc welding robot welds the tube sheet, the heat exchange tubes, due to their long length, tend to bend when assembled onto the tube sheet. One end of the heat exchange tube passing through the tube hole receives support from the tube sheet, while the other end, lacking support, bends under its own weight, causing the portion of the heat exchange tube extending out of the tube hole to shift. When the arc welding robot welds the tube sheet and heat exchange tubes, because the robot welds around the heat exchange tubes along a set axis, the weld between the heat exchange tubes and the tube sheet becomes uneven, affecting the welding quality of the tube sheet. Summary of the Invention

[0005] This invention provides a tube sheet welding device for heat exchanger production, which solves the technical problem in the related art where heat exchange tubes bend due to their large length and lack of support when assembling on a tube sheet, causing the portion of the heat exchange tube extending out of the tube hole to shift.

[0006] This invention provides a tube sheet welding device for heat exchanger production, including a lifting mechanism, a transverse diaphragm mechanism, and an arc welding robot. The top of the lifting mechanism is fixedly connected to the transverse diaphragm mechanism, and the arc welding robot is disposed on one side of the lifting mechanism. It also includes a roller mechanism installed on the transverse diaphragm mechanism. The lifting mechanism includes a base frame, a lifting frame, and a fixed frame. The fixed frame is disposed on one side of the transverse diaphragm mechanism, and the bottom end of the fixed frame is fixedly connected to the base frame. A baffle is provided on one side of the fixed frame, and fixed plates are fixedly connected to both sides of the bottom of the baffle. The fixed plates are fixed to the base frame by bolts.

[0007] In a preferred embodiment, a support mechanism is provided on the side of the transverse partition mechanism away from the fixed frame. The support mechanism includes a support frame, a support base, and a support plate. The support frame is fixedly connected to the side wall of the base frame. Several sets of support bases are provided along the height direction of the support frame. The support bases are fixedly connected to the side wall of the support frame. The support plate is embedded in the support base, and both ends of the support plate are respectively opposed to the inner wall of the support base.

[0008] In a preferred embodiment, the top of the support plate is provided with several sets of bearing seats along the length of the support plate. The bearing seats are fixedly connected to the top wall of the support plate. The bearing seats are arc-shaped and are used to support the end of the heat exchange tube away from the fixed frame.

[0009] In a preferred embodiment, the transverse partition mechanism includes partitions, and several groups of partitions are equidistantly arranged along the width direction of the lifting frame. The partitions are fixedly connected to the top of the lifting frame, and the two ends of the roller mechanism are rotatably connected to the side walls of the partitions respectively.

[0010] In a preferred embodiment, the roller mechanism includes a first roller and a second roller, which are located on both sides of a partition. The first roller and the second roller are rotatably connected to the side of the partition. The partition has a connecting hole. A rotating ring is fixedly connected to the side end of the first roller and the second roller near the partition. The rotating ring is rotatably connected to the inner wall of the connecting hole.

[0011] In a preferred embodiment, a locking assembly is provided inside the first roller shaft, and a plug-in assembly is provided on the partition plate. The plug-in assembly is located between the first roller shaft and the second roller shaft, and is used to limit the locking assembly.

[0012] In a preferred embodiment, the locking assembly includes a spring and a locking post, which are disposed inside the first roller shaft. The two ends of the spring are fixedly connected to the first roller shaft and the locking post, respectively. The locking post is slidably connected to the inner wall of the first roller shaft. The insertion and extraction assembly abuts against the locking post. A rotating ring fixed to the side end of the second roller shaft fits against the insertion and extraction assembly.

[0013] In a preferred embodiment, a limiting groove is formed on the inner wall of the first roller shaft, and limiting plates are fixedly connected to both sides of the locking post. The limiting plates are slidably connected to the inner wall of the limiting groove. A positioning block is fixedly connected to the side wall of the second roller shaft. The positioning block is hexagonal prism in shape. A positioning groove is formed at the end of the locking post near the second roller shaft, and the positioning block is embedded in the positioning groove.

[0014] In a preferred embodiment, the plug-in assembly includes a connecting plate and a blocking plate. The blocking plate is provided with several groups along the length direction of the connecting plate. The top of the blocking plate is fixedly connected to the connecting plate. Several blocking grooves are equidistantly opened inside the partition along the length direction. The blocking plate is slidably connected to the inner wall of the blocking groove. The blocking plate is used to limit the locking pin.

[0015] In a preferred embodiment, the end of the blocking plate near the locking pin has an inclined surface, and the end of the locking pin near the blocking plate has an inclined surface along the axis of the locking pin.

[0016] The beneficial effects of this invention are as follows:

[0017] 1. This invention moves the heat exchange tube along a roller mechanism, which rolls in response to the movement of the heat exchange tube. When the heat exchange tube is inserted into the tube hole, the roller mechanism provides support for the heat exchange tube, thus preventing the heat exchange tube from bending and avoiding the offset of the contact area between the heat exchange tube and the tube sheet. When the arc welding robot welds the tube sheet and the heat exchange tube, the weld is uniform.

[0018] 2. When the heat exchange tube of the present invention is assembled by the roller mechanism, the heat exchange tube passes through the tube hole, and the part of the heat exchange tube extending out of the tube hole abuts against the baffle. The baffle limits the part of the heat exchange tube extending out of the tube hole, thereby ensuring that the part of the heat exchange tube extending out of the tube hole meets the required welding size, thereby avoiding the need to correct the part of the heat exchange tube extending out of the tube plate when the heat exchange tube is assembled on the tube plate. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 This is a schematic diagram of the lifting mechanism of the present invention.

[0021] Figure 3 This is a schematic diagram of the support mechanism of the present invention.

[0022] Figure 4 This is a right view of the lifting mechanism structure of the present invention.

[0023] Figure 5 This is the invention Figure 4 AA section view of the lifting mechanism.

[0024] Figure 6 This is the invention Figure 4 BB section view of the lifting mechanism.

[0025] Figure 7 This is the invention Figure 6 A magnified schematic diagram of the structure at point C.

[0026] Figure 8 This is a schematic diagram of the barrier plate structure of the present invention.

[0027] Figure 9 This is a schematic diagram of the locking pin structure of the present invention.

[0028] Figure 10 This is a schematic diagram of the first roller structure of the present invention.

[0029] Figure 11 This is a schematic diagram of the second roller shaft structure of the present invention.

[0030] In the diagram: 1. Lifting mechanism; 101. Base frame; 102. Lifting frame; 103. Baffle; 104. Fixing plate; 105. Fixing frame; 2. Transverse partition mechanism; 201. Partition; 202. Connecting plate; 203. Blocking plate; 204. Blocking groove; 205. Connecting hole; 3. Arc welding robot; 4. Support mechanism; 401. Support frame; 402. Support seat; 403. Support plate; 404. Bearing seat; 5. Roller mechanism; 501. First roller; 502. Second roller; 503. Spring; 504. Locking column; 505. Positioning groove; 506. Positioning block; 507. Limiting plate; 508. Limiting groove; 509. Rotating ring. Detailed Implementation

[0031] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, features described in some examples may be combined in other examples.

[0032] like Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 6 and Figure 7As shown, a tube sheet welding device for heat exchanger production includes a lifting mechanism 1, a transverse partition mechanism 2, and an arc welding robot 3. The top of the lifting mechanism 1 is fixedly connected to the transverse partition mechanism 2, and the arc welding robot 3 is disposed on one side of the lifting mechanism 1. It also includes a roller mechanism 5 installed on the transverse partition mechanism 2. The lifting mechanism 1 includes a base frame 101, a lifting frame 102, and a fixing frame 105. The fixing frame 105 is disposed on one side of the transverse partition mechanism 2, and the bottom end of the fixing frame 105 is fixedly connected to the base frame 101. A baffle 103 is provided on one side of the fixing frame 105, and fixing plates 104 are fixedly connected to both sides of the bottom of the baffle 103. The fixing plates 104 are fixed to the base frame 101 by bolts.

[0033] In this embodiment, the specific implementation scenario is as follows: When the heat exchange tubes are assembled, the tube sheet is placed at the fixing frame 105, and the tube sheet is fixed to the fixing frame 105 with bolts for vertical placement. The heat exchange tubes are manually placed one by one on the roller mechanism 5. The heat exchange tubes move along the roller mechanism 5, and the roller mechanism 5 rolls due to the movement of the heat exchange tubes. When the heat exchange tubes are inserted into the tube holes, the roller mechanism 5 provides support for the heat exchange tubes, thereby preventing the heat exchange tubes from bending and thus preventing the part of the heat exchange tubes and the tube sheet from shifting. When the arc welding robot 3 welds the tube sheet and the heat exchange tubes, the weld is uniform.

[0034] When the heat exchange tubes are assembled via the roller mechanism 5, the heat exchange tubes pass through the tube holes, and the portion of the heat exchange tubes extending out of the tube holes abuts against the baffle 103. The baffle 103 limits the portion of the heat exchange tubes extending out of the tube holes, thereby ensuring that the portion of the heat exchange tubes extending out of the tube holes meets the required welding dimensions. This avoids the need to correct the portion of the heat exchange tubes extending out of the tube sheet when assembling the heat exchange tubes on the tube sheet. When the heat exchange tubes are assembled on the tube sheet, the bolts on the fixing plate 104 are removed, and then the baffle 103 is removed from the base frame 101. The arc welding robot 3 can then directly weld the tube sheet.

[0035] It should be further explained that the arc welding robot includes a welding power source, a wire feeding mechanism, a robotic arm, and a welding torch. The wire feeding mechanism and welding torch are mounted on the robotic arm. The welding power source is responsible for generating a stable electric arc, the wire feeding mechanism delivers the welding wire at a set speed, and the welding torch also sprays protective gases (such as argon or carbon dioxide) to prevent the molten metal from being oxidized. This arc welding robot is existing technology.

[0036] It should be added that a support mechanism 4 is provided on the side of the transverse partition mechanism 2 away from the fixed frame 105. The support mechanism 4 includes a support frame 401, a support base 402, and a support plate 403. The support frame 401 is fixedly connected to the side wall of the base frame 101. Several sets of support bases 402 are provided along the height direction of the support frame 401. The support bases 402 are fixedly connected to the side wall of the support frame 401. The support plate 403 is embedded in the support base 402, and both ends of the support plate 403 are respectively opposed to the inner wall of the support base 402. When the heat exchange tube is assembled by the roller mechanism 5... When the tube sheet has array holes, the heat exchange tubes are assembled by the roller mechanism 5. After the tube holes and heat exchange tubes on the same horizontal plane are assembled, the lifting frame 102 can be controlled by the cylinder of the prior art. The lifting frame 102 moves vertically downward with the horizontal partition mechanism 2, and the horizontal partition mechanism 2 moves vertically downward with the roller mechanism 5 to assemble the heat exchange tubes in the next group of tube holes on the tube sheet. However, the heat exchange tubes that have been assembled at this time lack support. In order to avoid this phenomenon, the support mechanism 4 can support the heat exchange tubes.

[0037] Specifically, before the lifting frame 102 descends, the operator first pushes the support plate 403 horizontally along the support base 402, so that the arc groove of the bearing base 404 contacts the bottom outer wall of the assembled heat exchange tubes and forms a support. After the support plate 403 is installed in place, the lifting frame 102 is controlled to drive the transverse partition mechanism 2 and the roller mechanism 5 to move vertically downward to the height of the next tube bank.

[0038] It should be added that after the baffle 103 is removed, although the part of the heat exchange tube extending out of the tube hole loses the direct support of the baffle 103, the outer wall of the heat exchange tube and the inner wall of the tube hole form static friction due to the elastic deformation or interference fit during the tube insertion process. This friction is sufficient to overcome the small axial thrust generated during the welding process and maintain the axial position stability of the heat exchange tube in the tube hole.

[0039] It should be added that the top of the support plate 403 is provided with several sets of bearing seats 404 along the length of the support plate 403. The bearing seats 404 are fixedly connected to the top wall of the support plate 403. The bearing seats 404 are arc-shaped and are used to support the end of the heat exchange tube away from the fixing frame 105. When the heat exchange tube is supported by the support plate 403 at the end away from the tube sheet, the tube sheet lacks lateral restraint on the support plate 403. When the next set of tube sheets is installed, it will generate vibration. When the vibration is transmitted to the tube sheet on the support plate 403, the tube sheet will shift laterally. Therefore, the bearing seats 404 added in this invention can restrain the two sides of the heat exchange tube. When the support plate 403 is installed at the bottom of the heat exchange tube, the bearing seats 404 are placed at the bottom of the heat exchange tube. The shape of the bearing seats 404 can support the heat exchange tube and restrain the two sides of the heat exchange tube. Finally, the support plate 403 is inserted into the support seat 402.

[0040] In this embodiment, as Figure 3 , Figure 4 , Figure 8 As shown, the transverse partition mechanism 2 includes a partition 201. The partition 201 is provided in several groups at equal intervals along the width direction of the lifting frame 102. The partition 201 is fixedly connected to the top of the lifting frame 102. The two ends of the roller mechanism 5 are rotatably connected to the side wall of the partition 201 respectively.

[0041] When the heat exchange tubes are assembled via the roller mechanism 5, they are installed one by one. Each heat exchange tube passing through causes the roller mechanism 5 to rotate. The rotation of the roller mechanism 5 moves the already installed heat exchange tubes, and the baffle 103 can block and limit the assembled heat exchange tubes. At this time, the roller mechanism 5 rotates while the assembled heat exchange tubes are stationary, and sliding friction occurs between the heat exchange tubes and the roller mechanism 5. The surface of the heat exchange tubes generally has anti-corrosion coatings, wear-resistant coatings, thermally conductive coatings, etc. The sliding friction generated between the roller mechanism 5 and the heat exchange tubes will... The coating on the surface of the heat exchange tube is scratched. Therefore, in another embodiment of the invention, in order to solve the above problem, the roller mechanism 5 includes a first roller 501 and a second roller 502. The first roller 501 and the second roller 502 are respectively located on both sides of the partition 201. The first roller 501 and the second roller 502 are rotatably connected to the side of the partition 201. The partition 201 is provided with a connecting hole 205. The side ends of the first roller 501 and the second roller 502 near the partition 201 are fixedly connected with a rotating ring 509. The rotating ring 509 is rotatably connected to the inner wall of the connecting hole 205.

[0042] It should be further explained that the roller mechanism 5 and the partition plate 201 of the present invention are provided in multiple sets. The roller mechanism 5 is formed into a multi-segment by being installed on the partition plate 201. When the heat exchange tube is placed on the roller mechanism 5 for assembly, the heat exchange tube will only drive a single roller mechanism 5 to rotate. The rotation between each roller mechanism 5 will not affect each other. The partition plate 201 separates the roller mechanisms 5 and provides a limit for the movement of the heat exchange tube, provides a guiding function for the movement of each heat exchange tube, and at the same time provides a supporting function for the rotation of the roller mechanism 5.

[0043] When the heat exchange tubes are placed sequentially on the first roller 501 for conveying and assembly, the heat exchange tubes drive the first roller 501 to rotate. The first roller 501 drives the rotating ring 509 to rotate along the inner wall of the connecting hole 205. After the heat exchange tubes are assembled, the second heat exchange tube is placed on the second roller 502. When the second roller 502 is rotated, the second roller 502 drives the rotating ring 509 to rotate along the inner wall of the connecting hole 205. Since the partition 201 separates the rotating ring 509 of the first roller 501 and the second roller 502, the second set of heat exchange tubes should not affect the already assembled heat exchange tubes during conveying and assembly.

[0044] In existing technologies, when assembling heat exchanger tubes on a heat exchanger tube sheet, the heat exchanger tubes include not only single tubes but also U-shaped heat exchanger tubes. For the lifting mechanism 1, transverse partition mechanism 2, and roller mechanism 5 designed in this invention, there is a problem that the first roller 501 and the second roller 502 rotate at different speeds when assembling the U-shaped heat exchanger tubes. Specifically, when the heat exchanger tube is U-shaped, it requires two sets of roller mechanisms 5 for transport. However, when the heat exchanger tube is placed on the roller mechanism 5, the rotation speed of the first roller 501 and the second roller 502 differs. During the tube process, the two ends of the heat exchange tube are supported by the first roller 501 and the second roller 502 respectively. When the thrust on the heat exchange tube is uneven, the forces on the two ends of the heat exchange tube are unbalanced, and the heat exchange tube moves in different directions on the first roller 501 and the second roller 502. At this time, the rotation speeds of the first roller 501 and the second roller 502 driven by the heat exchange tube are different, which causes the two ends of the heat exchange tube to tilt when they move to the tube sheet. One end of the heat exchange tube contacts the tube sheet, while the other end has a gap with the tube sheet.

[0045] In this embodiment, as Figure 7 , such as 8, such as 9, Figure 10 and Figure 11 As shown, a locking assembly is provided inside the first roller shaft 501, and a plugging assembly is provided on the partition plate 201. The plugging assembly is located between the first roller shaft 501 and the second roller shaft 502, and is used to limit the locking assembly.

[0046] Therefore, in this invention, when the heat exchange tube is U-shaped, it is necessary to connect the adjacent first roller shaft 501 and second roller shaft 502 together to ensure that when the two ends of the heat exchange tube are conveyed by the first roller shaft 501 and second roller shaft 502, the rotation speed of the first roller shaft 501 and second roller shaft 502 is synchronized, so that when the heat exchange tube is conveyed by the first roller shaft 501 and second roller shaft 502, it can move to the tube sheet synchronously.

[0047] In order to connect the first roller shaft 501 and the second roller shaft 502 together, the insertion and removal assembly is removed vertically upward from the transverse partition mechanism 2. The insertion and removal assembly contacts the locking assembly and limits its movement. The locking assembly connects the first roller shaft 501 and the second roller shaft 502 together, thereby ensuring that the first roller shaft 501 and the second roller shaft 502 rotate coaxially.

[0048] It should be added that the locking assembly includes a spring 503 and a locking post 504. The spring 503 and the locking post 504 are disposed inside the first roller shaft 501. The two ends of the spring 503 are fixedly connected to the first roller shaft 501 and the locking post 504, respectively. The locking post 504 is slidably connected to the inner wall of the first roller shaft 501. The insertion and extraction assembly abuts against the locking post 504. The rotating ring 509 fixed to the side end of the second roller shaft 502 fits against the insertion and extraction assembly. Since multiple sets of locking assemblies are provided along the length of the partition 201 for the first roller shaft 501 and the second roller shaft 502, and are located on both sides of the partition 201, the insertion and extraction assembly limits the locking assemblies disposed inside the multiple sets of locking assemblies in the first roller shaft 501. The insertion and removal assembly simultaneously separates the first roller shaft 501 and the second roller shaft 502 on both sides of the partition 201, preventing the rotation of the first roller shaft 501 and the second roller shaft 502 from affecting each other. When the insertion and removal assembly is pulled out, the insertion and removal assembly releases the locking assembly set in the multiple sets of first roller shafts 501, thereby releasing the locking post 504 from the limit of the insertion and removal assembly. The locking post 504 begins to move under the elastic force of the spring 503. The locking post 504 passes through the rotating ring 509 fixed to the first roller shaft 501, and then passes through the connecting hole 205 and the second roller shaft 502 to abut against it, thereby achieving the effect of connecting the first roller shaft 501 and the second roller shaft 502 together through the locking assembly.

[0049] It should be added that a limiting groove 508 is formed on the inner wall of the first roller shaft 501, and limiting plates 507 are fixedly connected to both sides of the locking post 504. The limiting plates 507 are slidably connected to the inner wall of the limiting groove 508. A positioning block 506 is fixedly connected to the side wall of the second roller shaft 502. The positioning block 506 is hexagonal prism in shape. A positioning groove 505 is formed at one end of the locking post 504 near the second roller shaft 502. The positioning block 506 is embedded in the positioning groove 505. When the locking post 504 moves toward the second roller shaft 502, the locking post 504 carries the limiting plate 507. 07 slides along the inner wall of the limiting groove 508. When the locking pin 504 and the side wall of the second roller 502 abut against each other, the positioning block 506 is inserted into the positioning groove 505. Due to the shape of the positioning block 506, the positioning block 506 and the inner wall of the positioning groove 505 abut against each other. When the first roller 501 rotates, the first roller 501 drives the locking pin 504 to rotate through the limiting plate 507 and the inner wall of the limiting groove 508. The locking pin 504 abuts against the positioning block 506 and the inner wall of the positioning groove 505, thereby realizing the synchronous rotation of the locking pin 504 and the second roller 502.

[0050] When the positioning groove 505 and the positioning block 506 are not aligned, due to the different rotational speeds of the first roller shaft 501 and the second roller shaft 502, the side surfaces of the locking pin 504 and the positioning block 506 are in contact. During the transition phase when the positioning groove 505 and the positioning block 506 are not aligned, there is a sliding contact between the end face of the locking pin 504 and the side surface of the positioning block 506. Since the elastic restoring force of the spring 503 mainly acts on axial reset, the normal pressure applied to its end face is relatively small. The frictional torque generated between the two is insufficient to significantly affect the independent rotation capability of the first roller shaft 501 and the second roller shaft 502 under conveying conditions. When the positioning groove 505 and the positioning block 506 are aligned, they will be directly connected together, and the first roller shaft 501 and the second roller shaft 502 will form a rotating shaft with the same speed.

[0051] It should be noted that a turntable is installed at one end of the locking pin 504 near the partition 201. This turntable can rotate on the side of the locking pin 504, and the inclined surface of the edge of the turntable is on the same inclined surface as the locking pin 504. When the partition 201 limits the locking pin 504, the partition 201 and the turntable are in contact. When the first roller 501 rotates with the locking pin 504, the turntable rotates relative to the locking pin 504 because it is in contact with the partition 201, thus avoiding the problem of wear caused by direct contact between the partition 201 and the locking pin 504.

[0052] It should be added that the plug-in assembly includes a connecting plate 202 and a blocking plate 203. The blocking plate 203 is provided with several sets along the length direction of the connecting plate 202. The top of the blocking plate 203 is fixedly connected to the connecting plate 202. Several blocking grooves 204 are equally spaced along the length direction inside the partition 201. The blocking plate 203 is slidably connected to the inner wall of the blocking groove 204. The blocking plate 203 is used to limit the locking post 504. When the plug-in assembly needs to be pulled out upward from the transverse partition mechanism 2, the connecting plate 202 is controlled to move upward. The connecting plate 202 moves the blocking plate 203 upward with it. The blocking plate 203 releases the limitation on the locking post 504. The connecting plate 202 pulls out multiple sets of blocking plates 203 upward at the same time.

[0053] It should be added that the end of the blocking plate 203 near the locking post 504 has an inclined surface, and the end of the locking post 504 near the blocking plate 203 has an inclined surface along the axis of the locking post 504. When the blocking plate 203 is inserted into the blocking groove 204, the bottom end of the blocking plate 203 slides along the side end of the locking post 504, and then the locking post 504 is squeezed. The locking post 504 is squeezed and enters the first roller shaft 501, which can then hold and reset the locking post 504.

[0054] In summary, the specific working principle is as follows:

[0055] I. Straight pipe assembly conditions:

[0056] The tube sheet is vertically fixed to the mounting frame 105 of the lifting mechanism 1. The heat exchange tubes are manually placed on the independent roller mechanism 5 separated by the partition 201. When the heat exchange tubes are pushed towards the tube sheet, they contact the first roller 501 or the second roller 502, and the friction force drives the corresponding roller to rotate around the rotating ring 509 within the connecting hole 205. Because there is physical isolation between adjacent partitions 201, the conveying of a single heat exchange tube only drives the roller of its channel to rotate, while the other rollers remain stationary.

[0057] After the heat exchange tube passes through the tube hole, it continues to move forward until its end face abuts against the side of the baffle 103. The baffle 103 is bolted to the base frame 101 via the fixing plate 104, forming a hard limit for axial displacement. At this point, the positioning of the heat exchange tube's insertion and extension length is completed.

[0058] After one row of tube holes is assembled, the lifting frame 102 descends, driving the transverse partition mechanism 2 and roller mechanism 5 to move down to the height of the next row of tube holes. Before descending, the operator pushes the support plate 403 along the support base 402, so that the bearing base 404 supports the suspended end of the assembled heat exchange tube, and then the lifting action is performed.

[0059] II. Synchronous conveying operation using U-shaped tubes:

[0060] When the heat exchange tube to be assembled is a U-shaped tube, both ends of the tube must be placed into two adjacent conveying channels at the same time.

[0061] The operator lifts the connecting plate 202 in the plug-in assembly upwards, causing the blocking plate 203 to slide out of the partition 201 along the blocking groove 204. The blocking plate 203 releases the pressure limit on the inclined surface of the locking pin 504.

[0062] Under the elastic restoring force of the spring 503, the locking pin 504 slides axially along the limiting groove 508 on the inner wall of the first roller shaft 501 toward the second roller shaft 502. The locking pin 504 passes through the rotating ring 509 and the connecting hole 205, and the positioning groove 505 at its end is opposite to the positioning block 506 on the side wall of the second roller shaft 502.

[0063] If the positioning groove 505 and the positioning block 506 are aligned, they will fit together directly; if they are not aligned, the end face of the locking post 504 will be attached and rotated until the positioning groove 505 and the positioning block 506 are aligned and then fitted together.

[0064] After being embedded, the torque of the first roller shaft 501 is transmitted to the locking post 504 through the cooperation of the limiting plate 507 and the limiting groove 508, and then to the second roller shaft 502 through the positioning block 506, so as to realize the circumferential locking and synchronous rotation of the two adjacent roller shafts.

[0065] Pre-welding preparation conditions:

[0066] After all heat exchange tubes are assembled, remove the connecting bolts between the fixing plate 104 and the base frame 101, and remove the baffle 103. The arc welding robot 3 moves to the side of the tube sheet and performs a circumferential arc welding operation at the junction of the heat exchange tube extension end and the tube sheet, with the tube hole axis as the reference.

[0067] Welded tube sheet operating conditions:

[0068] After all heat exchange tubes have been installed, the device enters the welding preparation state. At this time, the baffle 103 is removed, and the fixing frame 105 forms an unobstructed operating space facing the side of the arc welding robot 3.

[0069] The arc welding robot 3 moves to the side of the tube sheet according to the preset program. At this time, the heat exchange tube has passed through the tube hole of the tube sheet, and the part of the heat exchange tube extending out of the tube hole is in a cantilever state. Due to the roller mechanism 5 providing line support for the heat exchange tube body during the tube passing stage, and the support mechanism 4 lifting the end of the heat exchange tube away from the tube sheet, the posture of the heat exchange tube in the tube hole remains horizontal, and the axis of the heat exchange tube coincides with the axis of the tube hole.

[0070] The welding torch of the arc welding robot 3 moves around the outer circumference of the heat exchange tube with the axis of the heat exchange tube as the central reference, and at the same time ignites the electric arc to melt the connection between the outer wall of the heat exchange tube and the end face of the tube sheet to form a weld.

[0071] During this welding process, since the heat exchange tube does not experience axial deviation due to gravity bending, the distance between the welding torch and the outer wall of the heat exchange tube remains consistent on the circumferential trajectory. The energy distribution of the electric arc acting on the molten pool is circumferentially symmetrical, thus ensuring uniform weld seam on the tube sheet.

[0072] For the welding of U-shaped heat exchange tubes, the connecting plate 202 in the insertion assembly is lifted upwards, and the blocking plate 203 releases its restriction on the locking post 504. The locking post 504 extends axially under the action of the spring 503, and the positioning groove 505 engages with the positioning block 506, causing the first roller shaft 501 and the second roller shaft 502 to form a circumferential lock. During the tube insertion stage, this locking state ensures that both ends of the U-shaped heat exchange tube are synchronously pushed axially, and the tube ends simultaneously abut against the baffle 103, thereby ensuring that the lengths of the U-shaped tube extending from the tube sheet at both ends are consistent. When the arc welding robot 3 welds both ends of the U-shaped tube separately, the axial arc initiation positions of the weld seams at both ends are located in the same plane, and the weld formation is consistent.

[0073] After a row of heat exchange tubes is welded, the lifting frame 102 descends, causing the transverse partition mechanism 2 and roller mechanism 5 to move down to the height of the next tube row. During this process, the end of the welded heat exchange tube furthest from the tube sheet is supported by the bearing seat 404 above the support plate 403. The inner arc wall of the bearing seat 404 contacts the outer wall of the heat exchange tube and restricts its lateral displacement, thereby preventing the micro-movement of the tube body caused by the welding heat input from being transmitted to the newly solidified weld area.

[0074] The embodiments of this example have been described above. However, this example is not limited to the specific implementation methods described above. The specific implementation methods described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms based on the guidance of this example, and all of them are within the protection scope of this example.

Claims

1. A tube sheet welding device for heat exchanger production, comprising a lifting mechanism (1), a transverse partition mechanism (2), and an arc welding robot (3), wherein the top end of the lifting mechanism (1) is fixedly connected to the transverse partition mechanism (2), and the arc welding robot (3) is disposed on one side of the lifting mechanism (1); Its features are, It also includes a roller mechanism (5) installed on the transverse partition mechanism (2). The lifting mechanism (1) includes a base frame (101), a lifting frame (102) and a fixed frame (105). The fixed frame (105) is located on one side of the transverse partition mechanism (2). The bottom end of the fixed frame (105) is fixedly connected to the base frame (101). A baffle (103) is provided on one side of the fixed frame (105). Fixed plates (104) are fixedly connected to both sides of the bottom of the baffle (103). The fixed plates (104) are fixed to the base frame (101) by bolts.

2. The tube sheet welding apparatus for heat exchanger production according to claim 1, characterized in that, The transverse partition mechanism (2) is provided with a support mechanism (4) on the side away from the fixed frame (105). The support mechanism (4) includes a support frame (401), a support seat (402) and a support plate (403). The support frame (401) is fixedly connected to the side wall of the base frame (101). The support seat (402) is provided with several sets along the height direction of the support frame (401). The support seat (402) is fixedly connected to the side wall of the support frame (401). The support plate (403) is embedded in the support seat (402). The two ends of the support plate (403) abut against the inner wall of the support seat (402) respectively.

3. The tube sheet welding apparatus for heat exchanger production according to claim 2, characterized in that, The top of the support plate (403) is provided with several sets of bearing seats (404) along the length of the support plate (403). The bearing seats (404) are fixedly connected to the top wall of the support plate (403). The bearing seats (404) are in the shape of an arc. The bearing seats (404) are used to support the end of the heat exchange tube away from the fixed frame (105).

4. The tube sheet welding apparatus for heat exchanger production according to claim 1, characterized in that, The transverse partition mechanism (2) includes a partition (201). The partition (201) is provided in several groups at equal intervals along the width direction of the lifting frame (102). The partition (201) is fixedly connected to the top of the lifting frame (102). The roller mechanism (5) is rotatably connected to the side wall of the partition (201) at both ends.

5. A tube sheet welding apparatus for heat exchanger production according to claim 4, characterized in that, The roller mechanism (5) includes a first roller (501) and a second roller (502). The first roller (501) and the second roller (502) are located on both sides of the partition (201). The first roller (501) and the second roller (502) are rotatably connected to the side of the partition (201). The partition (201) has a connecting hole (205). The first roller (501) and the second roller (502) are fixedly connected to the side end near the partition (201) with a rotating ring (509). The rotating ring (509) is rotatably connected to the inner wall of the connecting hole (205).

6. A tube sheet welding apparatus for heat exchanger production according to claim 5, characterized in that, The first roller (501) is provided with a locking assembly, and the partition (201) is provided with a plug-in assembly. The plug-in assembly is located between the first roller (501) and the second roller (502). The plug-in assembly is used to limit the locking assembly.

7. A tube sheet welding apparatus for heat exchanger production according to claim 6, characterized in that, The locking assembly includes a spring (503) and a locking post (504). The spring (503) and the locking post (504) are disposed inside the first roller shaft (501). The two ends of the spring (503) are fixedly connected to the first roller shaft (501) and the locking post (504) respectively. The locking post (504) is slidably connected to the inner wall of the first roller shaft (501). The axial direction of the locking post (504) is perpendicular to the plane of the partition (201). The insertion and removal assembly abuts against the locking post (504). The rotating ring (509) fixed on the side end of the second roller shaft (502) is in contact with the insertion and removal assembly.

8. A tube sheet welding apparatus for heat exchanger production according to claim 7, characterized in that, The inner wall of the first roller shaft (501) has a limiting groove (508). The locking post (504) is fixedly connected to the two sides of the limiting plate (507). The limiting plate (507) is slidably connected to the inner wall of the limiting groove (508). The side wall of the second roller shaft (502) is fixedly connected to the positioning block (506). The positioning block (506) is in the shape of a hexagonal prism. The locking post (504) has a positioning groove (505) at one end near the second roller shaft (502). The positioning block (506) is embedded in the positioning groove (505).

9. A tube sheet welding apparatus for heat exchanger production according to claim 6, characterized in that, The plug-in assembly includes a connecting plate (202) and a blocking plate (203). The blocking plate (203) is provided with several groups along the length direction of the connecting plate (202). The top of the blocking plate (203) is fixedly connected to the connecting plate (202). The partition (201) is provided with several blocking grooves (204) at equal intervals along the length direction. The blocking plate (203) is slidably connected to the inner wall of the blocking groove (204). The blocking plate (203) is used to limit the locking pin (504).

10. A tube sheet welding apparatus for heat exchanger production according to claim 9, characterized in that, The end of the blocking plate (203) near the locking pin (504) has an inclined surface, and the end of the locking pin (504) near the blocking plate (203) has an inclined surface along the axis of the locking pin (504).

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