Positioning tool for welding processing of evaporative condenser

Abstract

The invention relates to the technical field of evaporative condenser welding machining, in particular to a positioning tool for evaporative condenser welding machining, which comprises a welding device and a condenser main body, a coaxial calibration part comprises a shell fixed at the top of a driving part, and a motor is fixed on the inner side of the shell; the output end of the motor is in transmission connection with two sets of outer gears and inner gears, rotating blocks are fixed to the inner sides of the outer gears and the inner gears, a matching block is slidably clamped to the inner side of each rotating block, a calibration rod is slidably connected to the inner side of each matching block, and after the calibration rods are inserted into the condenser body, the calibration rods are connected with the matching blocks. Through cooperation with the through hole of the tube plate and the condensation tube, the coaxial piece extrudes the rotating roller, so that the axis of the supporting part is consistent with the axis of the through hole of the tube plate. The supporting part is matched with the coaxial calibration part to enable the axis of the condenser pipe, the axis of the supporting part and the axis of the pipe plate through hole to be consistent and support and fix the condenser pipe.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of welding processing of evaporative condensers, in particular to a positioning tool for welding processing of evaporative condensers. BACKGROUND

[0002] In the assembly of evaporative condensers, pipe expansion and welding are the core processes for ensuring the sealing and heat transfer efficiency of the heat exchange tube assembly (condensing tube, fin, tube plate). The mainstream process sequence is generally welding first and then expanding or expanding first and then welding. The expansion rod is inserted into the tube under the drive of a pneumatic cylinder or a hydraulic machine, expands the tube wall radially, and deforms the tube material plastically to press the fin hole wall. The maximum cross section of the expansion head needs to be slightly larger than the target tube diameter. The welding method is manual welding with welding equipment or automatic or semi-automatic welding using automatic argon arc welding (TIG) or local protection welding.

[0003] The welding of the weld joint between the condensing tube and the tube plate generally adopts the method of zonal skip welding. The welding is performed in layers and zones. The bottom layer of weld (backing weld) is preferentially completed for single-sided backing welding of all condensing tubes to form a continuous sealing layer, thereby avoiding the invasion of impurities during subsequent turning over. During operation, attention needs to be paid to short arc small sawtooth oscillation, control of consistent hole size, arc covering 2 / 3 of the molten pool and 1 / 3 of the hole, completion of welding on the other side after turning over, and return to the initial surface for filling and surface covering to reduce the accumulation of thermal stress. The tube plate is divided into 4 to 6 symmetrical areas, and the welding is performed in an S-shaped path to avoid local overheating. The welding interval between adjacent tubes is greater than or equal to 10 minutes to ensure that the temperature drops below 100 degrees Celsius.

[0004] In the prior art, positioning is generally performed manually. In the "welding first and then expanding" process of the evaporative condenser, the specific parameters of the weld width are determined according to the type of tube material, working pressure and process requirements, and generally do not exceed 3.5 mm. However, the dense arrangement of fins increases the local weight of the condensing tube. If not supported, the tube body is prone to deflection and deformation due to its own weight. If the gap between the fin hole diameter and the tube diameter is too small or the fins are not aligned, it may cause the condensing tube axis to deviate. The above reasons will cause the weld thickness of the tube plate and the condensing tube to be inconsistent and the subsequent bending pipe to be difficult to align. Insufficient thickness (thin weld area) will reduce the weld strength and easily cause cracks under thermal cycling or pressure fluctuations. Over-thick welds (thick weld area) will increase residual stress and cause local deformation of the tube plate. Even uneven thickness will cause uneven heat conduction of the tube plate, which may cause local overheating and accelerate the decomposition of refrigerant.

[0005] Therefore, the present application provides a positioning tool for welding processing of evaporative condensers, which can quickly position the cold and warm pipes according to the tube plate through hole, ensure uniform weld width and not affect welding. SUMMARY

[0006] Aiming at the problems of the existing technology, such as the axis of the condensing pipe is deviated, the welding seam thickness of the tube plate and the condensing pipe is inconsistent, the tube plate is locally deformed, the adjacent welding seam is unevenly stressed, the thickness is uneven, and the heat conduction of the tube plate is unbalanced, a positioning tool for welding and processing of an evaporative condenser is designed.

[0007] The positioning tool for welding and processing of the evaporative condenser adopts the technical scheme that: a positioning tool for welding and processing of an evaporative condenser, comprising a welding device and a condenser main body arranged on one side of the welding device, the condenser main body is composed of a tube plate, a condensing pipe and fins, the bottom of the welding device is provided with a driving part, the side of the welding device close to the condenser is provided with a coaxial calibration part, the inner side of the coaxial calibration part is rotatably connected with a coaxial part, the inner side of the coaxial part is rotatably connected with a rotating roller, and the inner side of the coaxial calibration part is slidably connected with a supporting part; the coaxial calibration part comprises an outer shell fixed on the top of the driving part, the inner side of the outer shell is fixed with a motor, and the output end of the motor is drivingly connected with two groups of outer gears and inner gears, the inner side of one group of outer gears and inner gears is fixed with a rotating block, the inner side of each rotating block is slidably connected with a matching block, the inner side of the outer shell is slidably connected with another matching block, the inner side of each matching block is slidably connected with a calibration rod, the calibration rod is inserted into the condenser main body, and the three calibration rods are angularly separated about the welding seam axis of the condenser main body by moving the motor, the coaxial part is extruded against the rotating roller by matching the through hole of the tube plate and the condensing pipe, so that the axis of the supporting part is consistent with the axis of the through hole of the tube plate; the supporting part is connected with the coaxial calibration part by the cylinder slidably connected with the inner side of the outer shell, the telescopic part fixed on the inner side of the cylinder and the supporting rod drivingly connected with the output end of the telescopic part, the telescopic part drives the supporting rod to move and supports and fixes the condensing pipe by matching the coaxial calibration part, so that the axis of the condensing pipe, the axis of the supporting part and the axis of the through hole of the tube plate are consistent.

[0008] Further, the coaxial calibration part further comprises a driving rod, the driving rod is fixedly connected with the output end of the motor, both ends of the driving rod are fixedly connected with pinions, the two pinions are respectively engaged with the two groups of outer gears and inner gears, the two groups of outer gears and inner gears are rotatably connected with the inner side of the outer shell, the inner side of the other group of outer gears and inner gears is fixedly connected with a driven block, and the driven block and the rotating block are fixedly connected on the same plane.

[0009] Further, the bottom of each matching block is fixedly connected with a spring, the other end of the spring at the bottom of one of the matching blocks is fixedly connected with the outer shell, and the other two outer gears and inner gears are fixedly connected with the rotating blocks.

[0010] Further, the inner side of each driven block is slidably connected with a linkage ring, the two sides of the linkage ring are slidably connected with linkage plates, the other ends of the linkage plates are slidably connected with the two sides of the matching block, and each calibration rod is slidably connected with the linkage ring and the inner side of the matching block on the same plane.

[0011] Further, the inner side of the shell is fixed with a telescopic part one, the output end of the telescopic part one is fixed with a support disc, and the end of the calibration rod away from the condenser body is slidably connected to the inner side of the support disc.

[0012] Further, the support part further comprises a fixed rod rotatably connected to the outer side of the cylinder, the output end of the telescopic part two is fixed with an extension rod, the other end of the extension rod is rotatably connected with a movable rod, the support rod is rotatably connected to the other end of the extension rod and the fixed rod, and the bottom of the cylinder is fixed with two connecting plates slidably connected to the inner side of the shell.

[0013] Further, the driving part comprises a guide rail two drivingly connected to the bottom of the shell, the bottom of the guide rail two is fixedly connected with a lifting part, the bottom of the lifting part is drivingly connected with a guide rail one, the welding device is fixed to the side of the lifting part away from the condenser body through a connecting part, the top of the guide rail one is fixed with a power part through a connecting part, the power part is located on one side of the lifting part, one side of the power part is fixed with a transmission rod, one of the main gears is slidably connected to the outer side of the transmission rod, the other main gear is fixed to the outer side of the transmission rod, and the outer side of each main gear is engaged with a driven gear.

[0014] Further, the outer side of the condenser body is detachably connected with a clamp, and the clamp is used for clamping the condenser body. The clamp comprises two protective shells, one of the protective shells is fixed to the top of the guide rail one, the other protective shell is drivingly connected to the inner side of the guide rail one, and the inner side of one of the driven gears and the other driven gear and the main gear slidably connected to the outer side of the transmission rod are rotatably connected to the inner side of the two protective shells.

[0015] Further, the inner side of the two driven gears is fixed with two opposite transverse telescopic rods, the inner side of the two driven gears is fixed with two opposite longitudinal telescopic rods, the output end of each transverse telescopic rod is fixed with a transverse clamping plate, and the output end of each longitudinal telescopic rod is fixed with a longitudinal clamping plate.

[0016] Further, the coaxial part comprises a side shell fixed to the side of the driven block close to the rotating block, the top of the side shell is slidably connected with two limiting rods and a threaded rod penetrating through, the threaded rod is located on the side close to the two limiting rods, the bottom of the two limiting rods and the threaded rod is fixed with a connecting block, the outer side of the threaded rod is threadedly connected with a special-shaped plate, the special-shaped plate is slidably connected to the inner side of the calibration rod, the special-shaped plate is slidably connected to the outer side of the two limiting rods, and the rotating roller is rotatably connected to the inner side of the adjacent two connecting blocks.

[0017] The beneficial effects of the present application are as follows: (1) The positioning fixture for welding evaporative condensers described in this invention uses a motor to drive two sets of external and internal gears, which in turn drive the rotating block and the mating block to move together. This allows three calibration rods to be inserted into the gap between the condenser tube and the tube sheet through hole and then separated at equal angles. Based on the principle of three points determining the center of a circle, the calibration rods are pressed against the inner wall of the through hole, forcibly aligning the axis of the condenser tube, the axis of the support, and the axis of the tube sheet through hole. The precision transmission of the gear system (external gear, internal gear, and pinion) ensures the synchronous movement of the calibration rods, while the spring reset design ensures that the calibration rods adaptively adjust their position after contacting the condenser tube, avoiding rigid collision damage to the tube wall. This structure significantly improves the welding alignment accuracy, reduces manual calibration errors, and is suitable for the positioning needs of condenser tubes of different diameters. (2) The positioning fixture for welding evaporative condensers described in this invention uses a four-bar linkage consisting of a cylindrical nested telescopic component two, an extension rod, a movable rod, and a support rod. When the telescopic component two retracts, the extension rod pushes the movable rod, causing the support rod to unfold around the cylinder axis, thus bidirectionally stretching both ends of the condenser tube. This design counteracts the bending of the condenser tube caused by gravity or fin pressure, ensuring the tube is level. Simultaneously, the clamping force can be adjusted with the stroke of the telescopic component two to accommodate different tube diameters. The sliding connection plate to the outer shell further enhances overall stability, avoids displacement caused by welding vibration, and ensures weld uniformity.

[0018] (3) The positioning fixture for welding and processing an evaporative condenser described in this invention has a coaxial component that connects a limiting rod and a threaded rod through a side shell. The rotation of the threaded rod drives the irregular plate to move up and down, changing the distance between the rotating roller and the condenser tube. When the calibration rod moves, it drives the irregular plate, which, through the linkage of the threaded rod and the rotating roller, squeezes the cylinder of the support part, achieving dynamic alignment between the axis of the support part and the through hole of the tube sheet. The threaded adjustment mechanism makes this structure compatible with condenser tubes of different sizes, while the limiting rod ensures that the sliding trajectory of the irregular plate is accurate and avoids skewing. The rolling contact of the rotating roller reduces friction loss and improves the service life of the equipment.

[0019] (4) The positioning fixture for welding evaporative condensers described in this invention uses a horizontal / vertical telescopic rod to drive the clamping plate. The position of the clamping plate is adjusted by independently controlled horizontal and vertical telescopic rods to adapt to tube sheets of different sizes. The protective shell is equipped with a drive wheel and a driven wheel, which, together with the transmission rod, realize the rotation of the condenser body, facilitating multi-angle operation of the welding robot. The linear output of the telescopic rod ensures uniform distribution of clamping force, while the protective shell structure prevents welding spatter from damaging the transmission components, thus balancing operational safety and positioning efficiency. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention. Figure One ; Figure 2This is a schematic diagram of the three-dimensional structure of the present invention. Figure Two ; Figure 3 This is a three-dimensional structural diagram of the drive unit of the present invention; Figure 4 This is a schematic diagram of the three-dimensional structure of the clamp of the present invention; Figure 5 This is a three-dimensional structural diagram of the condenser body of the present invention; Figure 6 This is a schematic diagram of the cross-sectional structure of the condenser body of the present invention; Figure 7 This is a three-dimensional structural diagram of the coaxial calibration part of the present invention; Figure 8 This is a schematic cross-sectional view of the coaxial calibration section of the present invention; Figure 9 This is a schematic diagram of the three-dimensional structure of the mating block of the present invention. Figure One ; Figure 10 This is a schematic diagram of the three-dimensional structure of the mating block of the present invention. Figure Two ; Figure 11 This is a three-dimensional structural diagram of the connecting plate of the present invention; Figure 12 This is a three-dimensional structural diagram of the support portion of the present invention; Figure 13 for Figure 11 Enlarged view of point A; Figure 14 for Figure 11 Enlarged view of point B; Figure 15 This is a three-dimensional structural diagram of the coaxial component of the present invention; Figure 16 This is a schematic cross-sectional view of the coaxial component of the present invention; Figure 17 This is a schematic diagram of the cross-sectional structure of the rotating block of the present invention; Figure 18 for Figure 17 Enlarged view of point C.

[0022] In the diagram: 1. Welding device; 2. Fixture; 21. Protective shell; 22. Lateral telescopic rod; 23. Longitudinal telescopic rod; 24. Longitudinal clamping plate; 25. Lateral clamping plate; 3. Condenser body; 31. Tube sheet; 32. Condenser tube; 33. Fin; 4. Coaxial calibration part; 41. Outer shell; 42. Motor; 43. Drive rod; 44. External gear; 45. Internal gear; 46. Rotating block; 47. Mating block; 48. Calibration rod; 482. Linkage plate; 483. Linkage ring; 49. Driven block; 5. Drive 51. Guide rail one; 52. Power component; 53. Transmission rod; 54. Drive wheel; 55. Driven wheel; 58. Lifting component; 59. Guide rail two; 6. Telescopic component one; 7. Support plate; 8. Coaxial component; 81. Side shell; 82. Limiting rod; 83. Irregular plate; 84. Threaded rod; 85. Connecting block; 9. Rotating roller; 10. Support part; 101. Cylinder; 102. Telescopic component two; 103. Extension rod; 104. Fixed rod; 105. Movable rod; 106. Support rod; 107. Connecting plate. Detailed Implementation

[0023] To make the technical means, technical features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0024] Example: Initial state as follows Figures 1-18As shown, a positioning fixture for welding evaporative condensers includes a welding device 1 and a condenser body 3 disposed on one side thereon. The welding device 1 can be used by a welding robot or by a person holding a welding device. The condenser body 3 is composed of a tube sheet 31, condensing tubes 32 and fins 33. The condensing tubes 32 are fitted inside the fins 33 and the tube sheet 31. A driving part 5 is provided at the bottom of the welding device 1. A coaxial calibration part 4 is provided on the side of the welding device 1 near the condenser. A coaxial component 8 is rotatably connected to the inner side of the coaxial calibration part 4. A rotating roller 9 is rotatably connected to the inner side of the coaxial component 8. A support part 10 is slidably connected to the inner side of the coaxial calibration part. The coaxial calibration unit 4 includes a housing 41 fixed to the top of the drive unit 5. A motor 42 is fixed inside the housing 41. The output end of the motor 42 is connected to two sets of external gears 44 and internal gears 45. A rotating block 46 is fixed inside each set of external gears 44 and internal gears 45. A mating block 47 is slidably engaged inside each rotating block 46. Another mating block 47 is slidably engaged inside the housing 41. A calibration rod 48 is slidably connected inside each mating block 47. After the calibration rod 48 is inserted into the condenser body 3, it moves in conjunction with the motor 42 to separate the three calibration rods 48 at equal angles about the weld axis of the condenser body 3. By cooperating with the through hole of tube sheet 31 and condenser tube 32, the coaxial member 8 squeezes the roller 9 to make the axis of support part 10 aligned with the axis of the through hole of tube sheet 31. The support part 10 is connected to a cylinder 101 slidably attached to the inside of the outer shell 41, a telescopic member 102 fixed to the inside of the cylinder 101, and a support rod 106 connected to the output end of the telescopic member 102. The telescopic member 102 moves the support rod 106 and, in cooperation with the coaxial calibration part 4, aligns the axis of condenser tube 32, the axis of support part 10, and the axis of the through hole of tube sheet 31, and supports and fixes condenser tube 32. The coaxial calibration part 4 also includes an active rod 43, which is fixedly connected to At the output end of the motor 42, both ends of the drive rod 43 are fixed with pinions. The two pinions mesh with two sets of external gears 44 and internal gears 45 respectively. Both sets of external gears 44 and internal gears 45 are rotatably connected to the inside of the housing 41. The inner sides of the other set of external gears 44 and internal gears 45 are fixed with driven blocks 49. The driven blocks 49 and rotating blocks 46 located on the same plane are fixedly connected. The bottom of each mating block 47 is fixed with a spring. The other end of the spring at the bottom of one of the mating blocks 47 is fixedly connected to the housing 41. The other two external gears 44 and internal gears 45 are fixedly connected to the rotating blocks 46.

[0025] In this embodiment, during the insertion of the support member into the condenser tube 32, the mating block 47 first contacts the condenser tube 32. Under the reaction force of the condenser tube 32, the mating block 47 moves towards the side closer to the top of the outer shell 41, ultimately causing the bottom of the calibration rod 48 to fit against the top of the condenser tube 32. Then, the telescopic member 6 is controlled to retract, and the telescopic member 6 drives the calibration rod 48 to move into the inside of the through hole through the support plate 7. Due to the use of a welding-then-expansion process, the condenser tube 32, under the action of gravity, is located at the bottom of the fin through hole and the tube plate 31 through hole, making the distance between the bottom of the top wall of the through hole and the condenser tube 32 greater than or equal to twice the weld, facilitating the movement of the three calibration rods 48. Then, the operator controls the motor 42 to rotate forward. The motor 42 drives the external gear 44 to rotate forward and the internal gear 45 to rotate in reverse through the drive rod 43, thereby enabling the two connected to one The rotating block 46 and driven block 49 drive the calibration rod 48 inside to rotate away from the middle calibration rod 48. The calibration rod 48 can slide inside the rotating block 46 and driven block 49. During the rotation, due to the annular design and fixed size of the through hole and condenser tube 32, the diameter of the three calibration rods 48 is set to be consistent with the width of the weld. Then, through the mutual squeezing action of the calibration rod 48 and the through hole of tube sheet 31, the axis of condenser tube 32 and the through hole of tube sheet 31 are aligned. The calibration rod 48 drives the irregular plate 83 to move. The irregular plate 83 drives the rotating roller 9 to squeeze the cylinder 101 to make the axis of cylinder 101 and the through hole of tube sheet 31 aligned. Based on the principle that three points determine a circle, the axis of condenser tube 32, the axis of support part 10, and the axis of tube sheet 31 through hole are aligned by the size of the through hole of tube sheet 31 and the calibration rod 48.

[0026] Specifically, each driven block 49 has a linkage ring 483 slidably engaged on its inner side, and linkage plates 482 are slidably engaged on both sides of the linkage ring 483. The other end of the linkage plates 482 is slidably engaged on both sides of the mating block 47. Each calibration rod 48 is slidably connected to the inner side of the linkage ring 483 and the mating block 47, which are located on the same plane.

[0027] In this embodiment, the mating block 47 drives the linkage plates 482 on both sides to move closer to the condenser body 3. The linkage ring 483 and the mating block 47 drive the linkage ring 483 to move the calibration rod 48 closer to the top of the outer casing 41, thereby ensuring that the calibration rod 48 tilts.

[0028] Specifically, a telescopic component 6 is fixed to the inner side of the outer casing 41. The telescopic component 6 can be configured as a telescopic rod or other device that can provide radial tensile and compressive force. A support plate 7 is fixed to the output end of the telescopic component 6. The end of the calibration rod 48 away from the condenser body 3 is slidably engaged with the inner side of the support plate 7.

[0029] In this embodiment, the operator controls the telescopic component 6 to extend and drive the calibration rod 48 out of the through hole of the tube sheet 31 to return to its original position via the support plate 7. Due to the action of the mating block 47, the distance between the calibration rod 48 and the round rod remains unchanged, thereby making the weld fully exposed and facilitating welding by the welding device 1.

[0030] Specifically, the support part 10 also includes a fixed rod 104 rotatably connected to the outside of the cylinder 101, an extension rod 103 fixed to the output end of the telescopic member 102, the telescopic member 102 can be configured as a telescopic rod or other device capable of providing radial tensile and compressive force, the other end of the extension rod 103 is rotatably connected to a movable rod 105, the support rod 106 is rotatably connected to the other end of the extension rod 103 and the fixed rod 104, and two connecting plates 107 are fixed to the bottom of the cylinder 101, the connecting plates 107 are slidably engaged with the inside of the outer shell 41.

[0031] In this embodiment, the operator controls the retraction of the telescopic component 102. The output end of the telescopic component 102 drives the movable rod 105 to move via the extension rod 103. The movable rod 105, the fixed rod 104, and the support rod 106 rotate relative to each other, causing the support rod 106 to unfold around the axis of the cylinder 101 until the condenser tube 32 is clamped. The force applied to the support rod 106 by the moving direction of the movable rod 105 causes the support rod 106 to stretch the condenser tube 32 to both ends, offsetting the pressure applied by the condenser tube 32 due to its own weight or the fins 33, ensuring that both ends of the condenser tube 32 are horizontal, and avoiding bending that would affect the subsequent welding effect.

[0032] Specifically, the coaxial component 8 includes a side shell 81, which is fixed to the driven block 49 on the side near the rotating block 46. The top of the side shell 81 is slidably connected to two limiting rods 82 and a threaded rod 84. The threaded rod 84 is located on the side of the two limiting rods 82 that are close to each other. The bottom of the two limiting rods 82 and the threaded rod 84 is fixed with a connecting block 85. The outer side of the threaded rod 84 is threadedly connected to a shaped plate 83. The shaped plate 83 is slidably engaged with the inner side of the calibration rod 48. The shaped plate 83 is slidably connected to the outer side of the two limiting rods 82. The rotating roller 9 is rotatably connected to the inner side of two adjacent connecting blocks 85.

[0033] In this embodiment, the distance between the shaped plate 83 and the rotating roller 9 can be changed by rotating the threaded rod 84 in different directions, thereby making it suitable for positioning condenser tubes 32 of different sizes. The calibration rod 48 can drive the shaped plate 83 on its inner side to move towards the side closer to the top of the outer shell 41. The shaped plate 83 drives the connecting block 85 and the rotating roller 9 to move away from the support member through the threaded rod 84.

[0034] Specifically, a clamp 2 is detachably connected to the outside of the condenser body 3. The clamp 2 is used to clamp the condenser body 3. The clamp 2 includes two protective shells 21. One protective shell 21 is fixed to the top of the guide rail 51, and the other protective shell 21 is drivenly connected to the inside of the guide rail 51. One driven wheel 55 and the other driven wheel 55, and the driving wheel 54 which is slidably engaged with the outside of the transmission rod 53 are rotatably connected to the inside of the two protective shells 21. Two opposing transverse telescopic rods 22 are fixed to the inside of each of the two driven wheels 55. Two opposing longitudinal telescopic rods 23 are fixed to the inside of each of the two driven wheels 55. A transverse clamping plate 25 is fixed to the output end of each transverse telescopic rod 22, and a longitudinal clamping plate 24 is fixed to the output end of each longitudinal telescopic rod 23.

[0035] In this embodiment, the extension or retraction of the transverse telescopic rod 22 and the longitudinal telescopic rod 23 are controlled to move the transverse clamping plate 25 or the longitudinal clamping plate 24, which can clamp or move tube sheets 31 of different sizes. The size of the clamp 2 can be designed according to the requirements, and each condenser tube 32 can be moved to the center of the drive wheel 54 for easy positioning and clamping, and then directly rotated with the drive unit 5, which provides convenience for subsequent welding.

[0036] Specifically, the drive unit 5 includes a second guide rail 59 that is driven to the bottom of the housing 41. A lifting component 58 is fixedly connected to the bottom of the second guide rail 59. The lifting component 58 can be configured as a hydraulic cylinder or other device capable of lifting. A first guide rail 51 is driven to the bottom of the lifting component 58. Both the first guide rail 51 and the second guide rail 59 can be electric slide rails or other devices capable of driving the device to move radially. The welding device 1 is fixed to the side of the lifting component 58 away from the condenser body 3 by a connecting component. A power component 52 is fixed to the top of the first guide rail 51 by a connecting component. The power component 52 can be configured as a combination of a three-phase motor and a reducer or other device capable of providing rotational force. The power component 52 is located on one side of the lifting component 58. A transmission rod 53 is fixed to one side of the power component 52. One of the drive wheels 54 is slidably engaged on the outside of the transmission rod 53. Another drive wheel 54 is fixed on the outside of the transmission rod 53. A driven wheel 55 is engaged on the outside of each drive wheel 54.

[0037] In this embodiment, the operator controls the lifting component 58 to change the vertical position of the coaxial calibration part 4, controls the second guide rail 59 to change the horizontal position of the coaxial calibration part 4 relative to the condenser body 3, controls the first guide rail 51 to change the distance between the coaxial calibration part 4 and the condenser body 3, the power component 52 drives the active rod 43 to rotate, and the active rod 43 can drive the clamp 2 to rotate the condenser body 3 by rotating through the active wheel 54 and the driven wheel 55. The operator controls the lifting component 58 to extend so that the coaxial calibration part 4 is on the same plane as the top row of through holes of the tube sheet 31, controls the second guide rail 59 to drive the support part 10 to align with one of the through holes in the top row of the tube sheet 31, and then the two lifting components 58 drive the second guide rail 59 on their top and the welding device 1 on one side of their side to move closer to the condenser body 3 so that the support part is inserted into the inside of the condenser tube 32.

[0038] Working principle: The operator controls the lifting component 58 and guide rail 2 59 to align the support part 10 with one of the through holes in the top row of the tube sheet 31. Then, the support component is inserted into the inside of the condenser tube 32 through the two guide rails 1 51. During the insertion of the support component into the condenser tube 32, the mating block 47 first contacts the condenser tube 32. Under the reaction force of the condenser tube 32, the mating block 47 moves to the side closer to the top of the outer shell 41, so that the bottom of the calibration rod 48 is in contact with the top of the condenser tube 32. Then, the telescopic component 1 6 is controlled to retract, and the motor 42 rotates forward, so that the two connected rotating blocks 46 and driven blocks 49 drive the calibration rod 48 inside to rotate away from the middle calibration rod 48. The calibration rod 48 can slide inside the rotating blocks 46 and driven blocks 49. During the rotation, based on the principle that three points determine a circle, the axis of the condenser tube 32, the axis of the support part 10, and the axis of the through hole of the tube sheet 31 are aligned by the size of the through hole of the tube sheet 31 and the calibration rod 48. Then the staff controlled the telescopic component 102 to retract, so that the support rod 106 would expand around the axis of the cylinder 101 until the clamping of the condenser tube 32 was completed. Repeating the above steps allows for precise positioning of all condenser tubes 32 and tube sheet 31 through holes.

[0039] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A positioning fixture for welding an evaporative condenser, comprising a welding device and a condenser body disposed on one side thereof, characterized in that: The condenser body is composed of tube sheet, condenser tube and fins. The bottom of the welding device is provided with a drive part. The side of the welding device near the condenser is provided with a coaxial calibration part. The inner side of the coaxial calibration part is rotatably connected with a coaxial component. The inner side of the coaxial component is rotatably connected with a rotating roller. The inner side of the coaxial calibration part is slidably connected with a support part. The coaxial calibration unit includes a housing fixed to the top of the drive unit. A motor is fixed inside the housing. The output end of the motor is connected to two sets of external gears and internal gears. A rotating block is fixed inside the outer and inner sides of each set of external and internal gears. A mating block is slidably engaged inside the inner side of each rotating block. Another mating block is slidably engaged inside the inner side of the housing. A calibration rod is slidably connected inside the inner side of each mating block. After the calibration rod is inserted into the condenser body, it moves with the motor to separate the three calibration rods at equal angles about the weld axis of the condenser body. Through the through hole of the tube sheet and the condenser tube, the coaxial component squeezes the rotating roller to make the axis of the support part aligned with the axis of the through hole of the tube sheet. The support unit consists of a cylinder that is slidably snapped onto the inner side of the outer shell, a telescopic component two that is fixed to the inner side of the cylinder, and a support rod that is connected to the output end of the telescopic component two. The telescopic component two moves the support rod and, in coordination with the coaxial calibration unit, aligns the axis of the condenser tube, the axis of the support unit, and the axis of the tube sheet through hole, thereby supporting and fixing the condenser tube.

2. The positioning fixture for welding and processing an evaporative condenser according to claim 1, characterized in that: The coaxial calibration part also includes an active rod, which is fixedly connected to the output end of the motor. Both ends of the active rod are fixed with pinions. The two pinions mesh with two sets of external gears and internal gears respectively. Both sets of external gears and internal gears are rotatably connected to the inside of the housing. The inner sides of the other set of external gears and internal gears are fixed with driven blocks, and the driven blocks and rotating blocks located on the same plane are fixedly connected.

3. The positioning fixture for welding and processing an evaporative condenser according to claim 1, characterized in that: Each mating block has a spring fixed to its bottom. The other end of the spring at the bottom of one of the mating blocks is fixedly connected to the outer shell. The other two external gears and internal gears are fixedly connected to the rotating block.

4. The positioning fixture for welding and processing an evaporative condenser according to claim 2, characterized in that: Each driven block has a linkage ring slidably engaged on its inner side, and linkage plates are slidably engaged on both sides of the linkage ring. The other end of each linkage plate is slidably engaged on both sides of the mating block. Each calibration rod is slidably connected to the inner side of the linkage ring and the mating block, which are located on the same plane.

5. The positioning fixture for welding and processing an evaporative condenser according to claim 4, characterized in that: A telescopic component is fixed to the inner side of the outer casing. A support plate is fixed to the output end of the telescopic component. The end of the calibration rod away from the condenser body is slidably engaged with the inner side of the support plate.

6. The positioning fixture for welding and processing an evaporative condenser according to claim 1, characterized in that: The support also includes a fixed rod rotatably connected to the outside of the cylinder, an extension rod fixed to the output end of the telescopic component two, a movable rod rotatably connected to the other end of the extension rod, a support rod rotatably connected to the other end of the extension rod and the fixed rod, and two connecting plates fixed to the bottom of the cylinder, which are slidably engaged with the inside of the outer shell.

7. The positioning fixture for welding and processing an evaporative condenser according to claim 1, characterized in that: The drive unit includes a second guide rail connected to the bottom of the housing, a lifting component fixedly connected to the bottom of the second guide rail, a first guide rail connected to the bottom of the lifting component, a welding device fixed to the side of the lifting component away from the condenser body via a connecting component, a power component fixed to the top of the first guide rail via a connecting component, the power component located on one side of the lifting component, a transmission rod fixed to one side of the power component, one drive wheel slidably engaged on the outer side of the transmission rod, another drive wheel fixed on the outer side of the transmission rod, and a driven wheel meshing on the outer side of each drive wheel.

8. The positioning fixture for welding and processing an evaporative condenser according to claim 7, characterized in that: A clamp is detachably connected to the outside of the condenser body, and the clamp is used to hold the condenser body. The fixture includes two protective shells. One protective shell is fixed to the top of the guide rail, and the other protective shell is connected to the inner side of the guide rail. One driven wheel and the other driven wheel, as well as the driving wheel that is slidably engaged with the outside of the transmission rod, are rotatably connected to the inner sides of the two protective shells.

9. A positioning fixture for welding an evaporative condenser according to claim 8, characterized in that: Two opposing transverse telescopic rods are fixed to the inner sides of both driven wheels, and two opposing longitudinal telescopic rods are fixed to the inner sides of both driven wheels. A transverse clamp is fixed to the output end of each transverse telescopic rod, and a longitudinal clamp is fixed to the output end of each longitudinal telescopic rod.

10. A positioning fixture for welding an evaporative condenser according to claim 2, characterized in that: The coaxial component includes a side shell, which is fixed to the driven block on the side near the rotating block. The top of the side shell is slidably connected to two limiting rods and a threaded rod. The threaded rod is located on the side close to the two limiting rods. A connecting block is fixed to the bottom of each of the two limiting rods and the threaded rod. A shaped plate is threadedly connected to the outside of the threaded rod. The shaped plate is slidably engaged with the inside of the calibration rod and slidably connected to the outside of the two limiting rods. The rotating roller is rotatably connected to the inside of two adjacent connecting blocks.

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