Positioning tool for welding processing of evaporative condenser

Abstract

The present application relates to the technical field of evaporative condenser welding processing, in particular to a positioning tool for evaporative condenser welding processing, which comprises a welding device and a condenser main body, and a coaxial calibration part which comprises a shell fixed on the top of a driving part, a motor fixed on the inner side of the shell, two groups of outer gears and inner gears drivingly connected to the output end of the motor, rotating blocks fixed on the inner sides of the outer gears and the inner gears, matching blocks slidingly connected to the inner sides of each rotating block, and calibration rods slidingly connected to the inner sides of each matching block, the calibration rods being separated at equal angles about the weld seam axis of the condenser main body by moving the calibration rods in cooperation with the motor after being inserted into the condenser main body, the coaxial part being extruded by a rotating roller to make the axis of the supporting part consistent with the axis of the through hole of the tube plate through the through hole of the tube plate and the condensing pipe, and the supporting part being matched with the coaxial calibration part to make the axis of the condensing pipe, the axis of the supporting part and the axis of the through hole of the tube plate consistent and support and fix the condensing 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 comprises a cylinder slidably connected to the inner side of the outer shell, a second telescopic part fixed to the inner side of the cylinder, and a supporting rod drivingly connected to the output end of the second telescopic part, the second telescopic part drives the supporting rod to move and matches the coaxial calibration part to make the axes of the condensing pipe, the supporting part and the through hole of the tube plate consistent and support and fix the condensing pipe.

[0008] Further, the coaxial calibration part further comprises a driving rod, the driving rod is fixedly connected to the output end of the motor, both ends of the driving rod are fixedly connected with small gears, the two small gears 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 to 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, one end of the spring at the bottom of one of the matching blocks is fixedly connected with the outer shell, and the other ends of the springs at the bottom of the other two matching blocks are respectively fixedly connected with the two 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 to the two sides of the matching block, and each calibration rod is slidably connected to 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 movable 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.

[0015] The clamp comprises two protective shells, one of the protective shells is fixed to the top of the guide rail one, and the other protective shell is drivingly connected to the inner side of the guide rail one, and the inner side of each of the driven gear and the other driven gear and the main gear slidably connected to the outer side of the transmission rod is rotatably connected to the inner side of the two protective shells.

[0016] Further, the inner side of each of the two driven gears is fixed with two oppositely arranged transverse telescopic rods, the inner side of each of the two driven gears is fixed with two oppositely arranged 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.

[0017] 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, 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.

[0018] The beneficial effects of the present application are as follows:

[0019] (1) The positioning tool for welding processing of the evaporative condenser, two groups of outer gears and inner gears are driven by a motor, the rotating block and the matching block are linked to make three calibration rods separate at equal angles after being inserted into the gap between the condensing pipe and the pipe plate through hole, according to the principle of three-point determination of the center of a circle, the calibration rod and the inner wall of the through hole are extruded to make the condensing pipe axis, the support part axis and the pipe plate through hole axis forced to align, the precise transmission of the gear system (outer gear, inner gear, pinion) ensures the synchronous movement of the calibration rod, and the spring reset design ensures that the calibration rod automatically adjusts the position after contacting the condensing pipe, so that rigid collision damage to the pipe wall is avoided. This structure significantly improves the welding centering accuracy, reduces the manual calibration error, and is suitable for the positioning needs of condensing pipes of different diameters

[0020] (2) The positioning tool for welding processing of the evaporative condenser, the support part adopts a four-bar mechanism composed of a cylindrical nested telescopic part two, an extension rod, a movable rod and a support rod, when the telescopic part two is contracted, the movable rod is pushed by the extension rod, the support rod is unfolded around the cylinder as the axis, and the two ends of the condensing pipe are stretched in both directions. This design offsets the bending of the condensing pipe caused by gravity sagging or fin pressure, ensures that the pipe body is horizontal, and the clamping force can be adjusted with the stroke of the telescopic part two to adapt to different pipe diameters. The connecting plate slidably connected to the shell further enhances the overall stability, avoids displacement caused by welding vibration, and ensures the uniformity of the weld.

[0021] (3) The positioning tool for welding processing of the evaporative condenser, the coaxial part is connected to the limiting rod and the threaded rod through the side shell, the threaded rod rotates to drive the special-shaped plate to move up and down, changing the distance between the rotating roller and the condensing pipe. When the calibration rod moves, it drives the special-shaped plate, and the threaded rod links the rotating roller to extrude the cylinder of the support part, realizing the dynamic alignment of the support part axis and the pipe plate through hole. The threaded adjustment mechanism makes the structure compatible with condensing pipes of different sizes, and the limiting rod ensures the accuracy of the sliding track of the special-shaped plate to avoid deviation. The rolling contact of the rotating roller reduces friction loss and improves the service life of the equipment.

[0022] (4) The positioning tool for welding processing of the evaporative condenser, the clamp drives the clamping plate with horizontal / vertical telescopic rods, adjusts the position of the clamping plate through independently controlled horizontal and vertical telescopic rods, and adapts to different sizes of pipe plates. The protective shell is provided with a driving wheel and a driven wheel, which cooperate with the transmission rod to realize the rotation of the condenser body, facilitating the multi-angle operation of the welding manipulator. The linear output of the telescopic rod ensures that the clamping force is evenly distributed, and the protective shell structure prevents welding spatter from damaging the transmission components, taking into account the operation safety and positioning efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0023] The present application will be further described below in conjunction with the drawings and examples.

[0024] Figure 1 The three-dimensional structure of the present application is shown Figure One ;

[0025] Figure 2 Schematic view of the three-dimensional structure of the driving part of the present application Figure Two ;

[0026] Figure 3 Schematic view of the three-dimensional structure of the condenser body of the present application

[0027] Figure 4 Schematic view of the three-dimensional structure of the clamp of the present application

[0028] Figure 5 Schematic view of the three-dimensional structure of the condenser body of the present application

[0029] Figure 6 Schematic view of the sectional structure of the condenser body of the present application

[0030] Figure 7 Schematic view of the three-dimensional structure of the coaxial calibration part of the present application

[0031] Figure 8 Schematic view of the sectional structure of the coaxial calibration part of the present application

[0032] Figure 9 Schematic view of the three-dimensional structure of the fitting block of the present application Figure One ;

[0033] Figure 10 Schematic view of the three-dimensional structure of the fitting block of the present application Figure Two ;

[0034] Figure 11 Schematic view of the three-dimensional structure of the connecting plate of the present application

[0035] Figure 12 Schematic view of the three-dimensional structure of the supporting part of the present application

[0036] Figure 13 Enlarged view of A of Figure 11 ;

[0037] Figure 14 Enlarged view of B of Figure 11 ;

[0038] Figure 15 Schematic view of the three-dimensional structure of the coaxial part of the present application

[0039] Figure 16 Schematic view of the sectional structure of the coaxial part of the present application

[0040] Figure 17 Schematic view of the sectional structure of the rotating block of the present application

[0041] Figure 18 Enlarged view of C of Figure 17 .

[0042] In the figure: 1, welding device; 2, clamp; 21, protective shell; 22, transverse telescopic rod; 23, longitudinal telescopic rod; 24, longitudinal clamping plate; 25, transverse clamping plate; 3, condenser main body; 31, tube plate; 32, condensing tube; 33, fin; 4, coaxial calibration part; 41, shell; 42, motor; 43, driving rod; 44, external gear; 45, internal gear; 46, rotating block; 47, matching block; 48, calibration rod; 482, linkage plate; 483, linkage ring; 49, driven block; 5, driving part; 51, guide rail one; 52, power piece; 53, transmission rod; 54, driving wheel; 55, driven wheel; 58, lifting piece; 59, guide rail two; 6, telescopic piece one; 7, support disc; 8, coaxial piece; 81, side shell; 82, limiting rod; 83, special-shaped plate; 84, threaded rod; 85, connecting block; 9, rotating roller; 10, support part; 101, cylinder; 102, telescopic piece two; 103, extension rod; 104, fixed rod; 105, movable rod; 106, support rod; 107, connecting plate. DETAILED DESCRIPTION

[0043] In order to make the technical means, technical features, purposes and effects realized by the present application easy to understand, the present application is further described below in combination with specific embodiments.

[0044] Embodiment: initial state as Figures 1-18As shown, a positioning fixture for welding an evaporative condenser 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 manual hand-held 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 make the three calibration rods 48 angularly aligned with the weld axis of the condenser body 3. The separation is achieved by using the through hole of the tube sheet 31 and the condenser tube 32 to make the coaxial member 8 squeeze the roller 9 so that the axis of the support part 10 is aligned with the axis of the through hole of the tube sheet 31. The support part 10 is connected to the cylinder 101 inside the outer shell 41 by sliding engagement, the telescopic member 102 fixed inside the cylinder 101, and the support rod 106 connected to the output end of the telescopic member 102 by transmission. The telescopic member 102 moves the support rod 106 and, in coordination with the coaxial calibration part 4, aligns 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, and supports and fixes the condenser tube 32. The coaxial calibration part 4 also includes an active rod 43. Fixedly connected to the output end of 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 inside 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 mating block 47 is fixedly connected to the housing 41. The other ends of the springs at the bottom of the other two mating blocks 47 are fixedly connected to the two rotating blocks 46 respectively.

[0045] In the embodiment, during the process of inserting the support into the condensing pipe 32, the fitting block 47 first contacts the condensing pipe 32, and the fitting block 47 moves to the side close to the top of the shell 41 under the reaction force of the condensing pipe 32, and finally the bottom of the calibration rod 48 is attached to the top of the condensing pipe 32, then the telescopic part one 6 is controlled to retract, and the telescopic part one 6 drives the calibration rod 48 to move into the inside of the through hole by the support disc 7, since the process of welding first and expanding later is adopted, the condensing pipe 32 is located at the bottom of the through hole of the fin plate and the through hole of the tube plate 31 under the action of gravity, so that the distance between the top wall of the through hole and the condensing pipe 32 is greater than or equal to twice the welding seam, which facilitates the movement of the three calibration rods 48, then the staff controls the motor 42 to rotate forward, the motor 42 drives the outer gear 44 to rotate forward and the inner gear 45 to rotate reversely through the driving rod 43, so that the two connected rotating blocks 46 and driven blocks 49 drive the calibration rods 48 inside to rotate away from one side of the middle calibration rod 48, the calibration rods 48 can slide inside the rotating blocks 46 and driven blocks 49, and during the rotation process, since the through hole and the condensing pipe 32 are designed in a ring shape and have fixed sizes, the diameters of the three calibration rods 48 are set to be consistent with the width of the welding seam, then the calibration rods 48 and the through hole of the tube plate 31 are extruded to make the axes of the condensing pipe 32 and the through hole of the tube plate 31 consistent, the calibration rods 48 drive the special-shaped plate 83 to move, the special-shaped plate 83 drives the rotating roller 9 to extrude the cylinder 101 to make the axes of the cylinder 101 and the through hole of the tube plate 31 consistent, and according to the principle of determining a circle by three points, the sizes of the through hole of the tube plate 31 and the calibration rods 48 make the axes of the condensing pipe 32, the support part 10 and the through hole of the tube plate 31 consistent.

[0046] Specifically, the inside of each driven block 49 is slidably connected with a linkage ring 483, the two sides of the linkage ring 483 are slidably connected with linkage plates 482, and the other ends of the linkage plates 482 are slidably connected to the two sides of the fitting block 47. Each calibration rod 48 is slidably connected to the inside of the linkage ring 483 and the fitting block 47 located in the same plane.

[0047] In the embodiment, the fitting block 47 drives the linkage plates 482 on its two sides to move to the side close to the condenser main body 3, the linkage ring 483 and the fitting block 47 drive the linkage ring 483 to move the calibration rod 48 to the side close to the top of the shell 41, thereby ensuring that the calibration rod 48 is inclined.

[0048] Specifically, the inside of the shell 41 is fixed with the telescopic part one 6, which can be a telescopic rod or other device capable of providing radial stretching and compression force. The output end of the telescopic part one 6 is fixed with the support disc 7, and the end of the calibration rod 48 away from the condenser main body 3 is slidably connected to the inside of the support disc 7.

[0049] In the embodiment, the worker controls the telescopic part 6 to extend through the support disc 7 to drive the calibration rod 48 to move out of the through hole of the tube plate 31 and return to the original position. Due to the cooperation of the blocks 47, the distance between the calibration rod 48 and the round rod remains unchanged, so that the weld is completely exposed, facilitating the welding of the welding device 1.

[0050] Specifically, the support part 10 further comprises a fixed rod 104 rotatably connected to the outside of the cylinder 101, and an extension rod 103 fixed to the output end of the telescopic part 2, the telescopic part 2 can be 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 with a movable rod 105, a support rod 106 is rotatably connected to the other end of the movable rod 105 and the fixed rod 104, and two connecting plates 107 are fixed to the bottom of the cylinder 101 and slidably connected to the inside of the shell 41.

[0051] In the embodiment, the worker controls the telescopic part 2 to contract, the output end of the telescopic part 2 drives the movable rod 105 to move through the extension rod 103, the movable rod 105, the fixed rod 104 and the support rod 106 rotate relatively, the support rod 106 expands around the axis of the cylinder 101 until it clamps the condenser pipe 32, and the movement direction of the movable rod 105 exerts a force on the support rod 106 to stretch the condenser pipe 32 to its two ends, offsetting the pressure of the condenser pipe 32 due to its own gravity or the fins 33, ensuring that the two ends of the condenser pipe 32 are horizontal, avoiding bending and affecting the effect of later welding.

[0052] Specifically, the coaxial part 8 comprises a side shell 81 fixed to one side of the driven block 49 close to the rotating block 46, two limiting rods 82 and a threaded rod 84 are slidably connected to the top of the side shell 81, the threaded rod 84 is located on the side close to the two limiting rods 82, the bottom of the two limiting rods 82 and the threaded rod 84 are fixed with connecting blocks 85, the outer side of the threaded rod 84 is threadedly connected with a special-shaped plate 83, the special-shaped plate 83 is slidably connected to the inside of the calibration rod 48, the special-shaped plate 83 is slidably connected to the outside of the two limiting rods 82, and the rotating roller 9 is rotatably connected to the inside of the adjacent two connecting blocks 85.

[0053] In the embodiment, rotating the threaded rod 84 in different directions can change the distance between the special-shaped plate 83 and the rotating roller 9, so that it can be applied to positioning condenser pipes 32 of different sizes, the calibration rod 48 can drive the special-shaped plate 83 inside it to move towards the side close to the top of the shell 41, and the special-shaped plate 83 drives the connecting blocks 85 and the rotating roller 9 to move away from the support part through the threaded rod 84.

[0054] Specifically, the outer side of the condenser body 3 is detachably connected with the clamp 2, the clamp 2 is used for clamping the condenser body 3, the clamp 2 comprises two protective shells 21, one of the two protective shells 21 is fixed to the top of the guide rail one 51, the other protective shell 21 is drivingly connected to the inner side of the guide rail one 51, one driven wheel 55 and the other driven wheel 55, a driving wheel 54 slidingly connected to the outer side of the transmission rod 53 are respectively rotatably connected to the inner sides of the two protective shells 21, the inner sides of the two driven wheels 55 are fixed with two oppositely arranged transverse telescopic rods 22, the inner sides of the two driven wheels 55 are fixed with two oppositely arranged longitudinal telescopic rods 23, the output end of each transverse telescopic rod 22 is fixed with a transverse clamping plate 25, and the output end of each longitudinal telescopic rod 23 is fixed with a longitudinal clamping plate 24.

[0055] In the embodiment, the transverse telescopic rods 22 and the longitudinal telescopic rods 23 are controlled to be elongated or contracted to drive the transverse clamping plates 25 or the longitudinal clamping plates 24 to move, different sizes of the tube plates 31 can be clamped or moved, the size of the clamp 2 can be designed according to the requirement, and each condenser pipe 32 can be moved to the center of the driving wheel 54 to facilitate positioning, clamping and directly rotating with the driving part 5, thereby providing convenience for subsequent welding.

[0056] Specifically, the driving part 5 comprises a guide rail two 59 drivingly connected to the bottom of the shell 41, the bottom of the guide rail two 59 is fixedly connected with a lifting piece 58, the lifting piece 58 can be provided as a hydraulic cylinder or other device capable of lifting, the bottom of the lifting piece 58 is drivingly connected with a guide rail one 51, the guide rail one 51 and the guide rail two 59 can be electric sliding rails or other devices capable of moving the device radially, the welding device 1 is fixed to the side of the lifting piece 58 away from the condenser body 3 through a connecting part, the top of the guide rail one 51 is fixed with a power piece 52 through a connecting part, the power piece 52 can be provided as a combination of a three-phase motor and a speed reducer or other devices capable of providing rotary force, the power piece 52 is located on one side of the lifting piece 58, the power piece 52 is fixed with a transmission rod 53 on one side, one of the transmission rod 53 is slidingly connected with a driving wheel 54, the other driving wheel 54 is fixed to the outer side of the transmission rod 53, and the outer sides of the driving wheels 54 are respectively rotatably connected with a driven wheel 55.

[0057] In the present embodiment, the worker controls the lifting member 58 to change the vertical position of the coaxial calibration portion 4, the control guide rail two 59 to change the horizontal position of the coaxial calibration portion 4 relative to the condenser main body 3, the control guide rail one 51 to change the distance between the coaxial calibration portion 4 and the condenser main body 3, the power member 52 to drive the driving rod 43 to rotate, the driving rod 43 to rotate through the driving wheel 54 and the driven wheel 55 to drive the clamp 2 to rotate the condenser main body 3, the worker controls the lifting member 58 to extend to make the coaxial calibration portion 4 and the top row of through holes of the tube plate 31 in the same plane, the control guide rail two 59 to drive the support portion 10 to align with one of the through holes of the top row of the tube plate 31, and then the two lifting members 58 to drive the guide rail two 59 on the top and the welding device 1 on the side to move to the side close to the condenser main body 3 to make the support member inserted into the inside of the condensing pipe 32.

[0058] Working principle: the worker controls the lifting member 58 and the guide rail two 59 to drive the support portion 10 to align with one of the through holes of the top row of the tube plate 31, and then the two guide rails one 51 to make the support member inserted into the inside of the condensing pipe 32, in the process of inserting the support member into the condensing pipe 32, the matching block 47 first contacts the condensing pipe 32, the matching block 47 moves to the side close to the top of the shell 41 under the reaction force of the condensing pipe 32, and finally the bottom of the calibration rod 48 is attached to the top of the condensing pipe 32, then the control telescopic member one 6 is retracted, the motor 42 is rotated in the positive direction, so that the two connected rotating blocks 46 and driven blocks 49 drive the inside calibration rod 48 to rotate away from one side of the middle calibration rod 48, the calibration rod 48 can slide in the inside of the rotating block 46 and the driven block 49, in the process of rotating, according to the principle of three points determining a circle, the size of the through hole of the tube plate 31 and the calibration rod 48 make the axis of the condensing pipe 32, the axis of the support portion 10 and the axis of the through hole of the tube plate 31 consistent;

[0059] Then the worker controls the telescopic member two 102 to retract, and the support rod 106 expands around the axis of the cylinder 101 until the clamping of the condensing pipe 32 is completed;

[0060] The above steps can be repeated to accurately position all the condensing pipes 32 and the through holes of the tube plate 31.

[0061] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application, and various changes and improvements can be made without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application 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. Two sets of external and internal gears are connected to the output end of the motor. A rotating block is fixed to the inner side of one set of external and internal gears, and a driven block is fixed to the inner side of the other set of external and internal gears. Driven blocks and rotating blocks located on the same plane are fixedly connected. A mating block is slidably engaged on the inner side of each rotating block. Another mating block is slidably engaged on the inner side of the housing. A calibration rod is slidably connected to the inner side of each mating block. A linkage ring is slidably engaged on the inner side of each driven block. Linkage plates are slidably engaged on both sides of the linkage ring. The other side of the linkage plate... One end is slidably engaged with both sides of the mating block. Each calibration rod is slidably connected to the linkage ring and the inner side of the mating block located on the same plane. 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 mating tube sheet and the condenser tube, the coaxial component squeezes the rotating roller to make the axis of the support part consistent with the axis of the through hole of the tube sheet. 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 small gears. The two small gears mesh with two sets of external gears and internal gears respectively. Both sets of external gears and internal gears are rotatably connected to the inner side of the outer casing. The support unit includes a cylinder that is slidably engaged with 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 driven to the output end of the telescopic component two. It also includes a fixed rod that is rotatably connected to the outer side of the cylinder. An extension rod is fixed to the output end of the telescopic component two. A movable rod is rotatably connected to the other end of the extension rod. The support rod is rotatably connected to the other end of the movable rod and the fixed rod. Two connecting plates are fixed to the bottom of the cylinder. The connecting plates are slidably engaged with the inner side of the outer shell. The telescopic component two drives the support rod to move and cooperates with the coaxial calibration unit to make the axis of the condenser tube, the axis of the support unit, and the axis of the tube sheet through hole consistent and to support and fix the condenser tube. 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.

2. The positioning fixture for welding and processing an evaporative condenser according to claim 1, characterized in that: Each of the mating blocks 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, and the other ends of the springs at the bottom of the other two mating blocks are fixedly connected to two rotating blocks respectively.

3. The positioning fixture for welding and processing an evaporative condenser according to claim 1, 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.

4. The positioning fixture for welding and processing an evaporative condenser according to claim 2, 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.

5. The positioning fixture for welding and processing an evaporative condenser according to claim 4, 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.

6. The positioning fixture for welding and processing an evaporative condenser according to claim 4, 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.

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