A positioning and welding apparatus for heat exchanger tube bundle and tube sheet

Abstract

The present application relates to heat exchanger welding processing technical field, and discloses a kind of positioning welding equipment for heat exchanger tube bundle and tube plate, including positioning ring, the positioning ring is uniformly fixed and connected with the positioning pin of flange connecting hole adaptation at tube plate edge, positioning ring is connected with the positioner at the end away from positioning pin, the positioner is connected with welding mechanism;Wherein, the positioner includes annular guide rail, the linear guide rail is fixedly connected with one pair of symmetrically through two symmetrically and slidingly arranged electric sliding blocks on the annular guide rail.The positioning welding equipment for heat exchanger tube bundle and tube plate, can effectively solve the prior art, the number of tube bundle connected on tube plate is more, before welding, it needs to be knocked and adjusted by artificial in turn tube bundle extension length, adjustment precision is insufficient, resulting in subsequent need secondary cutting, and more welding points lead to each place needs to be repositioned when welding, time-consuming is longer and cost is higher.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat exchanger welding processing, in particular to a positioning and welding device for heat exchanger tube bundle and tube plate. BACKGROUND

[0002] As the core equipment of chemical industry, energy industry and other industries, the tube bundle of the heat exchanger, as the key carrier of medium heat exchange, has sealing and pressure-bearing functions, is installed and fixed through the tube hole of the tube plate, and the connection part is fastened by welding process. The welding quality of the connection part directly determines the sealing performance and structural stability of the combination of the tube bundle and the tube plate, and further fundamentally affects the overall operation performance and safety and reliability of the equipment.

[0003] The current mainstream welding process mainly includes manual welding gun operation and mechanical welding arm operation, but both have significant technical limitations: first, the extended length of the tube bundle needs to be ensured to meet the process standard before welding, and currently this link relies on manual knocking adjustment, and the extended length is judged only by operating experience. Due to the lack of force control precision, the length deviation often exceeds the allowed range, and after welding is completed, secondary cutting processing is needed, which not only increases the process link and prolongs the production cycle, but also easily damages the weld or tube plate; second, the number of tube holes on the tube plate is usually large, and multiple welding points need to be welded one by one. During welding, each tube hole needs to be repositioned and calibrated, resulting in large consumption of working hours, high comprehensive cost, and possible misplacement of welding, thereby causing quality defects such as virtual welding and missed welding. SUMMARY

[0004] In view of the above shortcomings of the prior art, the present application provides a positioning and welding device for heat exchanger tube bundle and tube plate, which can effectively solve the problems of the prior art, such as the large number of connected tube bundles on the tube plate, the need for manual adjustment of the extended length of the tube bundle one by one before welding, the lack of adjustment precision, the need for secondary cutting afterwards, and the need for repositioning at each welding point during welding, which is time-consuming and costly.

[0005] To achieve the above purpose, the present application is realized by the following technical scheme:

[0006] The present application provides a positioning and welding device for heat exchanger tube bundle and tube plate, comprising:

[0007] A positioning ring is fixedly connected with positioning pins adapted to the flange connection holes at the edge of the tube plate in a uniform manner around the circumference, one end of the positioning ring away from the positioning pins is connected with a positioning mechanism, and the positioning mechanism is connected with a welding mechanism;

[0008] The position adjusting mechanism comprises a ring-shaped guide rail, two symmetrical and slidingly arranged electric sliding blocks are fixedly connected to the ring-shaped guide rail through a pair of symmetrical linear guide rails, two electric sliding blocks are slidingly connected to the two linear guide rails, and the two electric sliding blocks are connected to the shell through a connecting piece.

[0009] The welding mechanism comprises a ring-shaped seat, the ring-shaped seat is arranged in the shell, and the circumferential outer surface of the ring-shaped seat is fixedly connected with ear plates in a symmetrical manner, welding guns are mounted on the two ear plates through abutting components, a spring seat is rotatably connected in the ring-shaped seat, a centering block is connected to the movable section of the spring seat, a knocking component for adjusting the extension length of the tube bundle before welding is connected between the centering block and the ring-shaped seat, and a driving component is connected to the side of the ring-shaped seat away from the position adjusting mechanism.

[0010] Further, the connecting piece comprises a connecting block fixedly connected to the electric sliding block two, a moving block slidingly connected to the end of the connecting block away from the linear guide rail, and the moving block is fixedly connected to the shell, and traction springs are symmetrically arranged on both sides of the moving block in the sliding groove.

[0011] Further, the abutting component comprises an inclined groove, the two ear plates are provided with the inclined groove penetratingly and symmetrically, the included angle between the inclined groove and the central axis of the ring-shaped seat is forty-five degrees, a sleeve for mounting the welding gun is slidingly connected in the two inclined grooves, an abutting spring connecting the sleeve and the ear plate is arranged in the inclined groove, and the length direction of the sleeve is the same as the length direction of the inclined groove.

[0012] Further, the knocking component comprises a ring-shaped connecting plate fixedly connected to the end of the centering block away from the ring-shaped seat, a plurality of trapezoidal blocks are fixedly connected to the end of the ring-shaped connecting plate close to the ring-shaped seat in a circumferential direction, a knocking block is fixedly connected to the end of the spring seat close to the trapezoidal block, and a distance sensor for detecting the distance between the centering block and the fixed section of the spring seat is arranged on the end of the centering block close to the spring seat.

[0013] Further, the heights of the plurality of trapezoidal blocks are gradually increased, and the height difference between the trapezoidal block at the circumferential clockwise end of the ring-shaped connecting plate and the trapezoidal block at the circumferential clockwise starting end is formed to transition from the maximum height to the minimum height, so that the plurality of trapezoidal blocks form a continuous height gradient structure along the circumferential direction of the ring-shaped connecting plate.

[0014] Further, the driving component comprises a connecting plate rotatably connected to the end of the ring-shaped seat away from the centering block, a driving motor fixedly connected to the connecting plate, a driving shaft of the driving motor penetrating the connecting plate and fixedly connected to the spring seat, the connecting plate fixedly connected to the shell through a motor protection shell, and a limiting module connected to the connecting plate, the ring-shaped seat and the centering block.

[0015] Further, the limiting module comprises a one-way locking piece, the centering block and the spring seat are connected through the one-way locking piece, the one-way locking piece is fixedly connected with the distance sensor, and the connecting plate and the annular seat are uniformly and circumferentially provided with lock holes, and the centering block is uniformly and fixedly provided with lock rods matched with the lock holes.

[0016] Further, the inner wall of the shell is provided with a notch, and a wedge block is slidably connected in the notch through a return spring.

[0017] Compared with the prior art, the technical scheme provided by the present application has the following beneficial effects:

[0018] 1. Before welding, the centering block is positioned and attached to the end of the tube bundle under the action of the spring seat, the annular seat is rotated by the driving assembly, the knocking block on the annular seat rotates with the annular seat, and sequentially contacts with the trapezoidal blocks with gradually changing height on the annular connecting plate; since the trapezoidal blocks have a continuously height-varying structure along the circumference of the annular connecting plate, the knocking block will generate different degrees of extrusion force on the centering block when contacting with trapezoidal blocks of different heights, thereby accurately adjusting the length of the tube bundle to be extended, without manual knocking by experience, avoiding length deviation caused by inaccurate force control, reducing subsequent secondary cutting process, and preventing damage to the weld or tube plate.

[0019] 2. When the device is used, the positioning pin on the positioning ring is first adapted and docked with the flange connecting hole at the edge of the tube plate, so that the device and the tube plate are preliminarily and accurately positioned, and in subsequent welding of the tube bundle at different tube holes, the electric sliding block one is slid on the annular guide rail to drive the linear guide rail to adjust the position along the annular track, and at the same time, the electric sliding block two is slid on the linear guide rail to drive the shell and the welding mechanism to be finely adjusted in the linear direction, without the need to reposition and calibrate each welding point as a whole, thereby greatly reducing the positioning time and improving the welding efficiency.

[0020] 3. The welding gun is installed in the sleeve, the sleeve is slidably connected in the inclined groove of the two ear plates, and the abutting spring in the inclined groove always generates an abutting force on the sleeve to stably limit the sleeve in the inclined groove, avoiding shaking of the welding gun during welding. At the same time, according to the welding requirements, the sleeve can be slid and adjusted in position along the inclined groove, so that the welding gun can adapt to the welding position requirements of different specifications of tube bundle and tube plate, and the welding accuracy is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creating any labor.

[0022] Figure 1Fig. 1 is a schematic structural view of the positioning and welding equipment for the heat exchanger tube bundle and tube plate in the installed state on the tube plate according to the present application;

[0023] Figure 2 Fig. 2 is a schematic structural view of the separation of the positioning and welding equipment for the heat exchanger tube bundle and tube plate from the tube plate according to the present application;

[0024] Figure 3 Fig. 3 is a schematic structural view of the positioning and welding equipment for the heat exchanger tube bundle and tube plate according to the present application;

[0025] Figure 4 Fig. 4 is a schematic structural view of the separation of the linear guide rail, connecting piece and welding mechanism in the positioning and welding equipment for the heat exchanger tube bundle and tube plate according to the present application;

[0026] Figure 5 Fig. 5 is a schematic structural view of the positioning and welding equipment for the heat exchanger tube bundle and tube plate according to the present application Figure 4 Fig. 6 is a schematic structural view of the partial enlargement of position A in the positioning and welding equipment for the heat exchanger tube bundle and tube plate according to the present application;

[0027] Figure 6 Fig. 7 is a schematic structural view of the separation of the welding mechanism in the positioning and welding equipment for the heat exchanger tube bundle and tube plate according to the present application;

[0028] Figure 7 Fig. 8 is a schematic structural view of the separation of the annular seat and spring seat in the positioning and welding equipment for the heat exchanger tube bundle and tube plate according to the present application;

[0029] Figure 8 Fig. 9 is a schematic structural view of the separation of the abutting mechanism and knocking mechanism in the positioning and welding equipment for the heat exchanger tube bundle and tube plate according to the present application;

[0030] Figure 9 Fig. 10 is a schematic structural view of the separation of the annular connecting plate and trapezoidal block in the positioning and welding equipment for the heat exchanger tube bundle and tube plate according to the present application.

[0031] The reference numerals in the figures represent respectively: 1, positioning ring; 11, positioning pin; 2, position adjusting mechanism; 21, annular guide rail; 22, electric sliding block 1; 23, linear guide rail; 24, electric sliding block 2; 25, connecting piece; 251, connecting block; 252, shifting block; 253, traction spring; 26, machine shell; 261, notch; 262, return spring; 263, wedge block; 3, welding mechanism; 31, annular seat; 32, ear plate; 33, abutting assembly; 331, inclined groove; 332, sleeve; 333, abutting spring; 34, spring seat; 35, centering block; 36, knocking assembly; 361, annular connecting plate; 362, trapezoidal block; 363, knocking block; 364, distance sensor; 37, driving assembly; 371, connecting plate; 372, driving motor; 373, limiting module; 3731, one-way locking piece; 3732, lock hole; 3733, lock rod; 4, welding torch. DETAILED DESCRIPTION

[0032] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0033] The present application is further described below with reference to the embodiments.

[0034] Embodiment:

[0035] Please refer to Figures 1-9 The present application provides a technical solution: a positioning and welding device for heat exchanger tube bundle and tube plate, comprising:

[0036] A positioning ring 1 is uniformly and fixedly connected with positioning pins 11 adapted to the flange connecting holes at the edge of the tube plate in the circumferential direction, and a position adjusting mechanism 2 is connected to the end of the positioning ring 1 away from the positioning pins 11, and a welding mechanism 3 is connected to the position adjusting mechanism 2;

[0037] The position adjusting mechanism 2 comprises an annular guide rail 21, two symmetrical and slidingly arranged electric sliding blocks one 22 are fixedly connected to the annular guide rail 21 through a linear guide rail 23, two electric sliding blocks two 24 are slidingly connected to the linear guide rail 23, and the two electric sliding blocks two 24 are connected to a cabinet 26 through a connecting piece 25;

[0038] The welding mechanism 3 comprises an annular seat 31, the annular seat 31 is arranged inside the cabinet 26 and its circumferential outer surface is fixedly connected with ear plates 32, a welding gun 4 is installed on the two ear plates 32 through abutting components 33, a spring seat 34 is rotatably connected in the annular seat 31, a centering block 35 is rotatably connected to the movable section of the spring seat 34, a knocking assembly 36 for adjusting the length of the tube bundle before welding is connected between the centering block 35 and the annular seat 31, and a driving assembly 37 is connected to the side of the annular seat 31 away from the position adjusting mechanism 2.

[0039] Specifically, before the welding operation starts, the positioning reference needs to be built first: each positioning pin 11 is precisely inserted into the corresponding flange connection hole of the tube sheet. In this assembly state, the positioning ring 1 is coaxial and concentric with the tube sheet, ensuring the stability of the subsequent welding reference. Compared with the traditional mechanical arm welding, which needs to frequently perform complex positioning and calibration processes, consumes a lot of time, and has high equipment debugging and maintenance costs, the embodiment directly realizes the coaxial and concentric connection of the positioning ring 1 and the tube sheet through the precise matching of the positioning pin 11 and the flange connection hole, simplifies the reference building steps, and lays a foundation for subsequent efficient operation.

[0040] In the initial state, the electric sliding block 24 is in the middle position of the linear guide rail 23, the centering block 35 is precisely inserted into the tube bundle at the center of the tube sheet, and the head of the welding gun 4 is tightly abutted against the connection node of the tube bundle and the tube sheet under the action of the abutting assembly 33, completing the attitude calibration. At this time, the axis of the welding gun 4 has maintained a forty-five-degree angle with the central axis of the tube bundle, which establishes an angle reference in advance to ensure the quality of subsequent welding.

[0041] When the driving assembly 37 starts to operate, it will drive the corresponding parts in the knocking assembly 36 to rotate, and through continuous multiple knocking of the centering block 35, the dynamic adjustment of the extension length of the central tube bundle is realized. Compared with the traditional manual adjustment of the tube bundle extension length, which completely depends on the experience of the operator, the deviation of the tube bundle extension length can be effectively controlled through the automatic knocking adjustment of the knocking assembly 36, ensuring the adjustment accuracy and consistency.

[0042] During the adjustment process, the annular seat 31 always remains in the locked state, and the position of the welding gun 4 is fixed and always maintains the initial attitude, avoiding the influence of part displacement on the adjustment accuracy. Only when the adjustment of the tube bundle extension length is completed, the annular seat 31 is unlocked, and then the driving assembly 37 enters the secondary operation state: on the one hand, it drives the corresponding parts in the knocking assembly 36 to rotate in the opposite direction, and on the other hand, it synchronously drives the annular seat 31, the ear plate 32, and the welding gun 4 to rotate in the opposite direction along the same axis for one revolution, completing the full-circle welding of the connection node of the central tube bundle and the tube sheet. During the welding process, the axis of the welding gun 4 always maintains a forty-five-degree angle with the connection surface of the tube bundle and the tube sheet, i.e., it is located on the angle bisector of the two angles. This angle can ensure the uniform distribution of the welding pool, effectively reduce defects such as welding deviation, incomplete penetration, and undercut, and significantly improve the strength and consistency of the welded joint, which is better than the quality stability of traditional mechanical arm or manual welding.

[0043] After the welding of the tube bundle at the center is completed, the electric sliding block 2 24 slides along the linear guide rail 2 3, drives the centering block 3 5 to accurately shift to the position of the secondary inner circle tube bundle through the connecting piece 2 5. Compared with the traditional mechanical arm, each time the welding position is switched, the tedious process of repositioning and calibration needs to be performed. In the present scheme, under the action of the abutting assembly 3 3, the axis of the welding torch 4 and the central axis of the tube bundle always maintain a forty-five-degree angle. The welding torch 4 can automatically cross the welded central tube bundle and quickly abut on the connection node of the secondary inner circle tube bundle and the tube plate after crossing. No additional manual calibration is required, which greatly shortens the welding preparation time, saves the cost of the complex positioning system of the mechanical arm, and reduces the overall investment and operation and maintenance cost of the equipment. By repeating the above adjustment and welding process, the welding of the secondary inner circle tube bundle can be completed.

[0044] At the same time, the electric sliding block 1 22 is started to operate synchronously, drives the two linear guide rails 2 3 to rotate around the central axis of the positioning ring 1, so that the centering block 3 5 can accurately switch between the secondary outer circle tube bundles, and sequentially complete the welding of the connection nodes of all outer circle tube bundles and the tube plate. Through the coordinated movement of the electric sliding block 1 22 and the electric sliding block 2 24, the welding torch 4 can quickly shift to any welding position in the plane of the tube plate. After each shift, the centering block 3 5 can automatically complete positioning without the need for repeated calibration.

[0045] The connecting piece 2 5 includes a connecting block 2 5 1 fixedly connected to the electric sliding block 2 4. The end of the connecting block 2 5 1 away from the linear guide rail 2 3 is slidingly connected to a shifting block 2 5 2 through a sliding groove. The shifting block 2 5 2 is fixedly connected to the machine shell 2 6. Traction springs 2 5 3 are symmetrically arranged on both sides of the shifting block 2 5 2 in the sliding groove.

[0046] Specifically, during the movement of the electric sliding block 2 4, the shifting block 2 5 2 is driven by the traction springs 2 5 3 to realize synchronous displacement, thereby pulling the machine shell 2 6 to the edge of the tube bundle to be welded. This position needs to maintain the farthest distance from the central tube bundle, and a small distance is additionally moved after reaching the target position, so as to ensure that the centering block 3 5 can accurately enter the inside of the tube bundle to be welded each time. After the centering block 3 5 enters the tube bundle, the symmetrically distributed traction springs 2 5 3 will automatically contract. On the one hand, the displacement error that may be generated during the movement of the electric sliding block 2 4 can be effectively compensated, thereby fundamentally avoiding the problem that the centering block 3 5 cannot smoothly enter the tube bundle due to position deviation, and further improving the overall positioning accuracy. On the other hand, the head of the welding torch 4 can be prevented from directly abutting on the end of the tube bundle, so as to ensure that the welding torch 4 can smoothly reach the connection position of the tube bundle and the tube plate, thereby providing protection for the normal development of subsequent welding work.

[0047] The abutting assembly 33 comprises a chute 331, and the chute 331 is arranged on the two ear plates 32, the included angle between the chute 331 and the central axis of the annular seat 31 is 45 degrees, the two chutes 331 are slidably connected with a sleeve 332 for mounting the welding gun 4, and the chute 331 is provided with an abutting spring 333 connecting the sleeve 332 and the ear plate 32, and the length direction of the sleeve 332 is the same as the length direction of the chute 331.

[0048] Specifically, the abutting spring 333 always maintains the abutting state of the sleeve 332, which makes the welding gun 4 continuously have the tendency to move outward along the chute 331. When the centering block 35 abuts to the inside of the tube bundle, the head of the welding gun 4 can always closely fit the connection between the tube bundle and the tube plate, which fundamentally guarantees the stability and consistency of the welding operation and effectively ensures the welding quality.

[0049] Meanwhile, the sleeve 332 adopts a sliding design to cooperate with the inclined layout of the welding gun 4, forming a clever self-adaptive adjustment structure. When the welding gun 4 encounters the tube bundle during movement, the sleeve 332 can automatically avoid obstacles by sliding along the chute 331, smoothly passing through the obstacles. After passing through the tube bundle, the welding gun 4 can be quickly reset and re-abut the welding position under the action of the abutting spring 333. This self-adaptive adjustment capability not only improves the smoothness of the equipment operation and reduces the need for manual intervention, but also expands the adaptability of the equipment to complex working conditions, significantly improving the efficiency and safety of the welding operation.

[0050] The knocking assembly 36 comprises an annular connecting plate 361, the annular connecting plate 361 is fixedly connected to one end of the centering block 35 away from the annular seat 31, a plurality of trapezoidal blocks 362 are fixedly connected to the end of the annular connecting plate 361 close to the annular seat 31 in a uniform circumferential direction, a knocking block 363 is fixedly connected to one end of the spring seat 34 close to the trapezoidal block 362, and a distance sensor 364 for detecting the distance between the centering block 35 and the spring seat 34 is arranged on one end of the centering block 35 close to the spring seat 34.

[0051] The heights of the plurality of trapezoidal blocks 362 are gradually increased, and the height difference between the trapezoidal block 362 at the clockwise circumferential end of the annular connecting plate 361 and the trapezoidal block 362 at the clockwise circumferential starting end is formed from the maximum height to the minimum height, so that the plurality of trapezoidal blocks 362 form a continuous height gradient structure along the circumferential direction of the annular connecting plate 361.

[0052] The driving assembly 37 comprises a connecting plate 371 rotationally connected at one end of the annular seat 31 away from the centering block 35, the connecting plate 371 is fixedly connected with a driving motor 372, a driving shaft of the driving motor 372 penetrates through the connecting plate 371 and is fixedly connected with the spring seat 34, the connecting plate 371 is fixedly connected with the machine shell 26 through a motor protection shell, and the connecting plate 371, the annular seat 31 and the centering block 35 are jointly connected with a limiting module 373.

[0053] The limiting module 373 comprises one-way locking members 3731, the centering block 35 and the spring seat 34 are connected through the one-way locking members 3731, the distance sensor 364 is fixedly connected with the one-way locking members 3731, the connecting plate 371 and the annular seat 31 are both uniformly provided with lock holes 3732 in the circumferential direction, and the centering block 35 is uniformly fixedly connected with lock rods 3733 matched with the lock holes 3732.

[0054] The inner wall of the machine shell 26 is provided with a notch 261, a wedge block 263 is slidingly connected in the notch 261 through a return spring 262, the wedge block 263 is arranged on the ear plate 32 close to the front in the clockwise direction, one end close to the ear plate 32 is attached to the ear plate 32, the ear plate 32 is limited to rotate clockwise relative to the wedge block 263, and a chamfer is formed at one end of the wedge block 263 away from the ear plate 32, so that the ear plate 32 can be reset after rotating one circle.

[0055] It is worth noting that the driving motor 372 is preferably a bidirectional servo motor, and the one-way locking members 3731 are preferably ratchets and pawls (prior art, the internal structure is not shown), when the spring seat 34 is driven by the driving motor 372 to rotate clockwise, the one-way locking members 3731 between the spring rod movable section and the centering block 35 are in an unlocked state, the centering block 35 is locked by the lock rod 3733 and kept stationary, and when the spring seat 34 is driven by the driving motor 372 to rotate counterclockwise, the one-way locking members 3731 are all in a locked state, so that the centering block 35 rotates synchronously with the spring seat 34.

[0056] Specifically, in the initial state, the wedge 263 abuts against the ear plate 32 on the front side in the clockwise direction, and the one-way limiting of the annular seat 31 and the welding gun 4 is realized through the ear plate 32, only allowing the clockwise rotation of the two, when the centering block 35 moves to the corresponding tube bundle position, the circular truncated cone design close to one end of the tube bundle can play an automatic guiding and centering role, ensuring that the annular seat 31, the tube bundle and the driving motor 372 driving shaft are in a coaxial state, if the length of the tube bundle is too long, the lock rod 3733 far away from the tube bundle is inserted into the lock hole 3732 of the connecting plate 371, at this time, when the driving motor 372 rotates clockwise, the annular seat 31 remains stationary under the locking action of the lock rod 3733, and the one-way locking piece 3731 is in the unlocked state, and the centering block 35 also remains fixed under the constraint of the lock rod 3733, and realizes the central stable abutment with the tube bundle with the elastic force of the spring seat 34.

[0057] When the spring seat 34 rotates clockwise synchronously under the driving of the driving motor 372, the knocking block 363 is driven to rotate clockwise synchronously, and then relative motion is formed with each trapezoidal block 362. During the rotation process, the knocking block 363 first contacts and knocks the trapezoidal block 362 with the smallest height, and the displacement of the centering block 35 and the tube bundle is driven by the action force, and then the knocking block 363 knocks the trapezoidal block 362 with increasing height in sequence. This step-by-step knocking design forms a gradual adjustment process, which can finely control the length of the tube bundle, and avoid excessive sliding of the tube bundle due to excessive instantaneous impact force. When the knocking block 363 and the trapezoidal block 362 with the highest height are dislocated, the distance sensor 364 detects that the distance between the centering block 35 and the spring seat 34 reaches the preset value and sends a signal, and the driving motor 372 stops running immediately. At this time, the end of the lock rod 3733 is separated from the lock hole 3732 of the connecting plate 371, and the locking constraint of the annular seat 31 is automatically released.

[0058] Thereafter, the driving shaft of the driving motor 372 is switched to the counterclockwise rotation mode, at this time, the one-way locking piece 3731 enters the locking state, the spring seat 34 rotates to drive the centering block 35 to rotate synchronously through the one-way locking piece 3731, and then the annular seat 31 is driven to rotate counterclockwise synchronously through the lock rod 3733, so that the welding gun 4 rotates counterclockwise for one revolution, thereby realizing complete welding operation on the connection between the tube bundle and the tube plate. This linkage design not only ensures the orderly connection of the knocking adjustment and the welding operation, but also improves the operation precision and efficiency through automatic control. At the same time, the combination of one-way limiting and step-by-step knocking structure effectively enhances the stability and safety of equipment operation.

[0059] It is worth mentioning that the positioning and welding equipment for the heat exchanger tube bundle and tube plate also has the following advantages:

[0060] Advantage one, before welding, the centering block 35 is positioned with the pipe bundle end under the action of the spring seat 34, the driving assembly 37 drives the rotation of the annular seat 31, the knocking block 363 on the annular seat 31 rotates with the annular seat 31, and sequentially contacts the trapezoidal blocks 362 with gradually changing height on the annular connecting plate 361; because the trapezoidal blocks 362 have a continuously changing height along the circumference of the annular connecting plate 361, the knocking block 363 will produce different degrees of extrusion force on the centering block 35 when contacting the trapezoidal blocks 362 with different heights, thereby accurately adjusting the pipe bundle extension length, without manual experience-based knocking, avoiding length deviation caused by inaccurate force control, reducing subsequent secondary cutting process, and preventing damage to the weld or tube sheet.

[0061] Advantage two, when the device is in use, the positioning pin 11 on the positioning ring 1 is first adapted and docked with the flange connecting hole of the pipe plate edge, achieving preliminary accurate positioning of the device and the pipe plate, and in subsequent welding of the pipe bundle at different pipe holes, the electric sliding block one 22 can slide on the annular guide rail 21, driving the linear guide rail 23 to adjust the position along the annular trajectory, and at the same time, the electric sliding block two 24 can slide on the linear guide rail 23, driving the shell 26 and the welding mechanism 3 to fine-tune along the linear direction through the connecting piece 25, without the need to reposition and calibrate each welding point, greatly reducing the positioning time and improving the welding efficiency.

[0062] Advantage three, the welding gun 4 is installed in the sleeve 332, the sleeve 332 is slidingly connected in the inclined groove 331 of the two ear plates 32, the abutting spring 333 in the inclined groove 331 always produces an abutting force on the sleeve 332, stably limiting the sleeve 332 in the inclined groove 331, avoiding the shaking of the welding gun 4 during welding, and at the same time, according to the welding requirements, the sleeve 332 can be adjusted in position along the inclined groove 331, so that the welding gun 4 can adapt to the welding position requirements of different specifications of pipe bundles and pipe plates, ensuring the welding accuracy.

[0063] Advantage four, when welding, if the shell 26 is deviated due to external vibration or welding force, the moving block 252 in the connecting piece 25 will slide in the sliding groove of the connecting block 251, and the two side traction springs 253 will produce a reverse pulling force to pull the moving block 252 back to the initial position, achieving the buffer reset of the shell 26; at the same time, the wedge 263 in the inner wall slot 261 of the shell 26 is always in contact with the outer surface of the annular seat 31 under the action of the reset spring 262, which plays an auxiliary limiting role on the annular seat 31, reduces the shaking of the annular seat 31 during rotation, ensures the overall stability of the welding mechanism 3, avoids incomplete welding caused by device shaking, and reduces quality defects such as false welding and missed welding.

[0064] The fifth advantage is that the driving motor 372 drives the annular seat 31 to rotate through the driving shaft, and provides the welding mechanism 3 with the welding power in the circumferential direction. When it is necessary to pause the rotation of the annular seat 31 or fix the position of the annular seat 31, the one-way module limits the reverse rotation of the rotating ring, the locking rod 3733 on the rotating ring can be inserted into the locking hole 3732 on the connecting plate 371 and the annular seat 31, the relative fixation of the annular seat 31 and the connecting plate 371 is achieved, the arbitrary rotation of the annular seat 31 in the non-welding state is avoided, the orderly welding process is ensured, and the position calibration or the replacement of welding materials and the like during the welding process is facilitated.

[0065] The above examples are only used to illustrate the technical solutions of the present application, but not to limit it. Although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or some technical features can be replaced by equivalents. These modifications or replacements do not change the essence of the corresponding technical solutions out of the protection scope of the technical solutions of the embodiments of the present application.

Claims

1. A tacking apparatus for a heat exchanger tube bundle and tube sheet, characterized by, The utility model relates to a welding device for pipe bundle, which comprises a positioning ring (1) and a welding mechanism (3) connected to the positioning ring (1). The welding mechanism (3) comprises a ring-shaped seat (31) arranged inside the machine shell (26) and having ear plates (32) fixed symmetrically on the circumferential outer surface of the ring-shaped seat (31), a welding gun (4) mounted on the ear plates (32) through abutting components (33), a spring seat (34) rotatably connected to the ring-shaped seat (31), a centering block (35) connected to the movable section of the spring seat (34), a knocking assembly (36) for adjusting the length of the pipe bundle before welding, and a driving assembly (37) connected to the side of the ring-shaped seat (31) away from the positioning mechanism (2). The knocking assembly (36) comprises a ring-shaped connecting plate (361) fixedly connected to the end of the centering block (35) away from the ring-shaped seat (31), a plurality of trapezoidal blocks (362) fixedly connected to the end of the ring-shaped connecting plate (361) close to the ring-shaped seat (31), a knocking block (363) fixedly connected to the end of the spring seat (34) close to the trapezoidal blocks (362), and a distance sensor (364) arranged on the end of the centering block (35) close to the spring seat (34) to detect the distance between the centering block (35) and the fixed section of the spring seat (34). The heights of the trapezoidal blocks (362) gradually increase, and the height difference between the trapezoidal block (362) at the end of the ring-shaped connecting plate (361) in the clockwise direction and the trapezoidal block (362) at the starting end of the ring-shaped connecting plate (361) in the clockwise direction is formed to transition from the maximum height to the minimum height, so that the trapezoidal blocks (362) form a continuous height gradient structure along the ring-shaped connecting plate (361). The connecting piece (25) comprises a connecting block (251) fixedly connected to the electric sliding block (24), a moving block (252) slidably connected to the end of the connecting block (251) away from the linear guide rail (23), and a traction spring (253) symmetrically arranged on both sides of the moving block (252) in the sliding groove. ​ 2. A tacking apparatus for a heat exchanger tube bundle and tube sheet as defined in claim 1, wherein: ​ 3. A tacking device for a heat exchanger tube bundle and tube sheet as defined in claim 1, wherein: The abutting assembly (33) comprises a chute (331), the chute (331) is arranged on the two ear plates (32) and penetrates the ear plates (32), the included angle between the chute (331) and the central axis of the annular seat (31) is 45 degrees, the two chutes (331) are slidably connected with a sleeve (332) for mounting the welding gun (4), the chute (331) is further provided with a pressing spring (333) connecting the sleeve (332) and the ear plate (32), and the length direction of the sleeve (332) is the same as the length direction of the chute (331).

4. A tacking device for a heat exchanger tube bundle and tube sheet as defined in claim 1, wherein: The driving assembly (37) comprises a connecting plate (371), the connecting plate (371) is rotationally connected at one end of the annular seat (31) away from the centering block (35), the connecting plate (371) is fixedly connected with a driving motor (372), the driving shaft of the driving motor (372) penetrates the connecting plate (371) and is fixedly connected with the spring seat (34), the connecting plate (371) is fixedly connected with the machine shell (26) through the motor protection shell, and the connecting plate (371), the annular seat (31) and the centering block (35) are jointly connected with a limiting module (373).

5. A tube-to-tubesheet alignment welding apparatus for a heat exchanger tube bundle according to claim 4, characterized in that: The limiting module (373) comprises a one-way locking piece (3731), the centering block (35) and the spring seat (34) are connected through the one-way locking piece (3731), the distance sensor (364) and the one-way locking piece (3731) are fixedly connected, the connecting plate (371) and the annular seat (31) are uniformly provided with lock holes (3732) in the circumferential direction, and the centering block (35) is uniformly fixedly connected with lock rods (3733) matched with the lock holes (3732).

6. A tacking device for a heat exchanger tube bundle and tube sheet as defined in claim 1, wherein: The inner wall of the machine shell (26) is provided with a notch (261), and the wedge block (263) is slidably connected in the notch (261) through the reset spring (262).

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