Automatic tube penetrating machine for heat exchanger tube bundle

Abstract

The invention discloses an automatic pipe penetrating machine for a heat exchanger pipe bundle, and relates to the technical field of heat exchanger pipe penetrating, the automatic pipe penetrating machine comprises a machine base, a pipe conveying mechanism and a positioning mechanism, the pipe conveying mechanism is used for conveying vertical heat exchange pipes one by one, the positioning mechanism is used for vertically positioning a baffle plate assembly, and the automatic pipe penetrating machine further comprises a pipe clamping and putting mechanism and a blocking detection mechanism; the pipe fitting clamping and putting mechanism comprises a clamping mechanism and a driving mechanism, and the blocking detection mechanism comprises a blocking frame and a longitudinal pushing mechanism. The driving mechanism drives the vertically-clamped heat exchange pipe to reach the position above the plate hole in the corresponding position of the baffle plate assembly, then the heat exchange pipe is released, the heat exchange pipe automatically falls and is inserted into the baffle plate assembly in a penetrating mode through gravity, compared with transverse penetrating arrangement of the heat exchange pipe, whole-course pipe pushing is not needed, and the working efficiency is improved. And bending or deviation caused by the dead weight of the pipe during horizontal pipe penetrating can be reduced, the pipe penetrating resistance is reduced, and the pipe penetrating efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchanger tube threading, in particular to an automatic tube threading machine for a heat exchanger tube bundle. Background Art

[0002] A heat exchanger is a device that transfers part of the heat of a hot fluid to a cold fluid. It is also called a heat exchanger. A heat exchanger is usually composed of many tubes, which need to pass through baffles to fix and form flow channels to improve heat exchange efficiency. The function of the tube threading machine is to automatically and accurately pass these tubes through the holes on the baffles.

[0003] Existing heat exchanger tube threading machines generally include a support frame for positioning and supporting the baffle plate and a conduction mechanism for pushing the heat exchange tube. When threading, the heat exchange tube is transported to the conduction mechanism by a loading mechanism, and the heat exchange tube is horizontally installed. The heat exchange tube is also driven by a guide rail distributed according to a certain coordinate system to be horizontally aligned with the plate holes at the corresponding positions, and then the conduction mechanism drives the heat exchange tube to move horizontally through the distributed plate holes.

[0004] The shortcomings of the existing heat exchanger tube threading machines are as follows: the existing heat exchanger tube threading machines all pass the heat exchange tubes horizontally through the plate holes on the distributed baffles, but the heat exchange tubes may be locally bent due to their own weight or insufficient guidance during the horizontal tube threading process, resulting in tube threading failure; and when threading the tube horizontally, the weight of the tube body mainly squeezes the plate hole wall in contact with the bottom, and the tube threading resistance will be relatively large, which can easily cause serious wear at local positions during the horizontal threading, especially when there are burrs on the plate hole wall or there are slight errors in the assembly position and size of the baffle, the resistance during the horizontal threading will be even greater, affecting the tube threading efficiency; and during the horizontal tube threading process, it is necessary to continuously provide power to the heat exchange tubes. Only when one heat exchange tube is completely pushed and inserted into place can the next heat exchange tube be removed for transportation and insertion, which also affects the tube threading efficiency. Summary of the invention

[0005] The object of the present invention is to provide an automatic tube threading machine for a heat exchanger tube bundle, so as to solve the technical problems in the prior art that the transverse tube threading method of the heat exchanger tube threading machine is easily blocked and the tube threading efficiency is low.

[0006] The technical problem to be solved by the present invention can be achieved by the following technical solutions: An automatic tube threading machine for a heat exchanger tube bundle comprises a machine base, a tube delivery mechanism and a positioning mechanism, wherein the tube delivery mechanism is used to deliver vertically placed heat exchange tubes one by one, and the positioning mechanism is used to vertically position a baffle assembly, and further comprises: The pipe clamping and delivering mechanism comprises a clamping mechanism and a driving mechanism. The clamping mechanism is used to clamp the heat exchange tube on the tube delivery mechanism. The driving mechanism drives the clamping mechanism clamping the heat exchange tube to move above the corresponding plate hole on the baffle assembly and releases the heat exchange tube. Obstruction detection mechanism, the obstruction detection mechanism includes a retaining frame and a longitudinal pushing mechanism. The retaining frame moves horizontally with the clamping mechanism. The retaining frame is used to detect whether the heat exchange tubes longitudinally penetrating through the baffle plate assembly are stuck. The longitudinal pushing mechanism is arranged on the retaining frame and is used to push down the heat exchange tubes stuck on the baffle plate assembly to be inserted in place.

[0007] Preferably, the driving mechanism includes a first electric drive rail and a second electric drive rail. The first electric drive rail is fixedly installed on one side of the machine base. The second electric drive rail is slidably arranged on the first electric drive rail, and the second electric drive rail and the first electric drive rail are perpendicular to each other in the same plane. The clamping mechanism is slidably arranged on one side of the second electric drive rail, and the retaining frame is arranged on the other side of the second electric drive rail.

[0008] Preferably, the obstruction detection mechanism further includes a pressure sensing switch and a connecting frame. The connecting frame is arranged in parallel on one side of the retaining frame and is fixedly connected to the second electric drive rail. An elastic telescopic member is transversely connected between the connecting frame and the retaining frame. The pressure sensing switch is fixedly installed on the side of the retaining frame close to the connecting frame, and the pressure sensing switch is used to control the operation of the longitudinal pushing mechanism.

[0009] Preferably, the longitudinal pushing mechanism includes a driving motor, a pushing rotating column and a synchronization mechanism. There are multiple pushing rotating columns, and they are longitudinally equidistantly distributed inside the retaining frame. Each pushing rotating column is rotatably connected to the retaining frame through a rotating shaft. All the pushing rotating columns are synchronously rotated through the synchronization mechanism. The driving motor is fixedly installed on the outer wall of the retaining frame, and one of the pushing rotating columns is fixedly connected to the main shaft of the driving motor. The driving motor is electrically connected to the pressure sensing switch.

[0010] Preferably, the synchronization mechanism includes a synchronous pulley and a synchronous belt. One end of each pushing rotating column is coaxially and fixedly connected with a synchronous pulley, and all the synchronous pulleys are cooperatively connected with the same synchronous belt.

[0011] Preferably, an impact plate is arranged between the connecting frame and the retaining frame, and the impact plate is in contact with the pushing rotating column. Guide rods are fixedly connected to both sides of the retaining frame, and the guide rods horizontally penetrate through the edge of the impact plate. A return spring is connected between the impact plate and the guide rods. Push-top mechanisms for pushing the impact plate are arranged at both ends of one of the pushing rotating columns. Each pushing rotating column is a hollow structure body and is made of elastic metal.

[0012] Preferably, the pushing mechanism includes a linkage gear, a reduction gear, and a push rod. The linkage gear is coaxially and fixedly connected to one of the pushing rotating columns. The reduction gear is rotatably connected to the outer wall of the blocking frame through a rotating shaft, and the reduction gear meshes with the linkage gear. One end of the push rod is coaxially and fixedly connected to the reduction gear, and the push rod is perpendicularly distributed to the rotating shaft of the reduction gear. A convex block matching the end of the push rod is arranged at a position of the impact plate close to the push rod.

[0013] Preferably, the clamping mechanism includes a sliding frame and clamping blocks. The sliding frame is slidably arranged on the second electric drive guide rail. Pneumatic telescopic rods are symmetrically and fixedly installed at both ends of the sliding frame. There are two clamping blocks, which are respectively fixedly arranged at the telescopic ends of the corresponding pneumatic telescopic rods.

[0014] Preferably, the pipe feeding mechanism includes a support base, a stepping motor, a fixed support plate, and a driving rotating column. The support base is arranged on the machine base. The stepping motor is fixedly installed on the support base. The fixed support plate is fixedly installed on the support base. The main shaft of the stepping motor penetrates through the fixed support plate. The driving rotating column is arranged on the fixed support plate and is fixedly connected to the end of the main shaft of the stepping motor. A plurality of card slots matching the heat exchange pipes are circumferentially and equidistantly arranged on the outer wall of the driving rotating column. A limiting ring fixedly connected to the fixed support plate is sleeved outside the driving rotating column. A material taking port is arranged on one side of the limiting ring close to the clamping mechanism.

[0015] Preferably, the positioning mechanism includes a support retaining ring and positioning clamping plates. The support retaining ring is fixedly arranged on the machine base through a bracket. There are a plurality of positioning clamping plates, which are circumferentially and equidistantly distributed on the outer ring of the support retaining ring. A plurality of electric guide rails are also circumferentially and equidistantly distributed on the machine base, and each positioning clamping plate is slidably connected to the corresponding electric guide rail.

[0016] Advantages of the present invention: 1. The present invention clamps the vertically placed heat exchange pipes through the clamping mechanism, and is driven by the driving mechanism to drive the vertically clamped heat exchange pipes to reach above the plate holes of the corresponding positions of the baffle plate assembly, and then releases the heat exchange pipes, so that the heat exchange pipes automatically fall and penetrate into the baffle plate assembly by gravity. Compared with the horizontal threading of heat exchange pipes, there is no need to push the pipe fittings throughout the process, and it is possible to reduce the bending or deviation caused by the self-weight of the pipe material during horizontal pipe threading, which helps to improve the alignment accuracy between the baffle plate holes and the heat exchange pipes. The gravity distribution on the contact surface between the heat exchange pipes and the baffle plate holes is relatively uniform, reducing local friction concentration, reducing the pipe threading resistance, and improving the pipe threading efficiency.

[0017] 2. Whenever the driving mechanism drives the clamping mechanism holding the heat exchange tube to move towards the corresponding plate hole position again in the present invention, the provided stop frame first passes through the position where the heat exchange tube has passed through. If the previous heat exchange tube gets stuck and does not completely fall and penetrate in place, the stop frame will be blocked, thereby squeezing the provided pressure sensing switch. The pressure sensing switch then causes the driving motor provided on the stop frame to drive the pushing rotating column to rotate, assisting in pushing the stuck heat exchange tube to continue to penetrate downward, and then continuing to complete the placement and penetration of the next heat exchange tube, ensuring that all heat exchange tubes can be effectively penetrated in place.

[0018] 3. When the driving motor drives the pushing rotating column to operate and push the stuck heat exchange tube to continue to penetrate downward in the present invention, the corresponding pushing rotating column also drives the provided push rod to rotate through the linkage gear and the reduction gear. The push rod continuously pushes against the impact plate, and each time the impact plate relies on the resilience of the return spring to reset and impact the distributed pushing rotating columns, thereby causing the pushing rotating column to vibrate and transmitting the vibration to the heat exchange tube, further assisting the heat exchange tube to fall and penetrate in place by relying on the vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic diagram of the relative position distribution of the limit ring and the fixed support plate in the present invention; Figure 3 is a schematic diagram of the mating connection between the driving rotating column and the limit ring in the present invention; Figure 4 is a schematic diagram of the relative position distribution of the positioning clamping plate and the support ring in the present invention; Figure 5 is a schematic diagram of the connection between the clamping block and the second electric driving mechanism in the present invention; Figure 6 is a schematic diagram of the connection between the stop frame and the second electric driving mechanism in the present invention; Figure 7 is Figure 6 an enlarged schematic diagram of part A in Figure 8 is a schematic diagram of the mating connection between the connection frame and the stop frame in the present invention; Figure 9 is Figure 8 an enlarged schematic diagram of part B in Figure 10 is a schematic diagram of the mating connection of all the pushing rotating columns in the present invention; Figure 11 is a schematic diagram of the mating connection between the universal ball and the impact plate in the present invention; Figure 12 is a schematic diagram of the state when the pushing rotating column contacts the heat exchange tube stuck on the baffle plate assembly in the present invention.

[0020] Description of reference numerals: 1. Machine base; 2. Support base; 3. Fixed support plate; 4. Limit ring; 5. Heat exchange tube; 6. First electric drive rail; 7. Second electric drive rail; 8. Positioning clamping plate; 9. Electric rail; 10. Baffle plate assembly; 11. Support ring; 12. Material taking port; 13. Clamping block; 14. Pneumatic telescopic rod; 15. Slide carriage; 16. Connecting frame; 17. Driving motor; 18. Elastic telescopic member; 19. Pushing rotating column; 20. Linkage gear; 21. Pushing rod; 22. Protrusion; 23. Reduction gear; 24. Pressure induction switch; 25. Guide rod; 26. Return spring; 27. Synchronous pulley; 28. Synchronous belt; 29. Universal ball; 30. Stepper motor; 31. Driving rotating column; 32. Card slot; 33. Stop frame; 34. Impact plate. Detailed implementation manners

[0021] The following will describe in detail the detailed implementation manners of the present invention, but it should be understood that the protection scope of the present invention is not limited by the detailed implementation manners.

[0022] As Figures 1-12 shown, an automatic tube threading machine for heat exchanger tubes bundles operates on heat exchangers with medium and short tube bundles. It includes a machine base 1, a tube feeding mechanism, and a positioning mechanism. The tube feeding mechanism is arranged on one side of the machine base 1 and is used to sequentially convey vertical heat exchange tubes 5. The positioning mechanism is arranged on the other side of the machine base 1 and is used to vertically position and fix the baffle plate assembly 10 to be tube-threaded. Plate holes for tube threading have been pre-processed on the baffle plate assembly 10. It should be noted that the baffle plate assembly 10 here includes a plurality of longitudinally distributed baffle plates, and adjacent baffle plates are fixedly connected together by columns to form a whole. The tube threading machine further includes a tube clamping and placing mechanism and an obstruction detection mechanism. The tube clamping and placing mechanism includes a clamping mechanism and a driving mechanism. The clamping mechanism is used to clamp the heat exchange tube 5 on the tube feeding mechanism. The driving mechanism controls the positioning based on a control system, controls the clamping mechanism to drive the heat exchange tube 5 to move above the corresponding plate hole on the baffle plate assembly 10, and then the control system controls the clamping mechanism to release, so that the heat exchange tube 5 is released, and the heat exchange tube 5 automatically passes through the baffle plate assembly 10 by gravity without being pushed throughout the process. At this time, the driving mechanism can drive the clamping mechanism to return to the position where the tube feeding mechanism is located to pick up the next heat exchange tube 5, improving the tube threading efficiency; It should be noted that the above control system marks the coordinates of the plate holes distributed on the baffle plate assembly 10 based on the plane coordinate system algorithm and sequentially places the heat exchange tubes 5 at each plate hole coordinate position; this technical means belongs to the prior art and will not be described in detail here; The obstruction detection mechanism includes a retaining frame 33 and a longitudinal pushing mechanism. The retaining frame 33 moves horizontally with the clamping mechanism. The retaining frame 33 is used to detect whether the heat exchange tube 5 vertically penetrating through the baffle plate assembly 10 is stuck. The longitudinal pushing mechanism is arranged on the retaining frame 33 and is used to push the heat exchange tube 5 stuck on the baffle plate assembly 10 downward to be inserted in place.

[0023] In some specific embodiments, the driving mechanism includes a first electric driving guide rail 6 and a second electric driving guide rail 7. The first electric driving guide rail 6 is fixedly installed on one side of the machine base 1 through a bracket. The second electric driving guide rail 7 is slidably arranged on the first electric driving guide rail 6 through a sliding seat, and the second electric driving guide rail 7 and the first electric driving guide rail 6 are perpendicular to each other in the same plane. The second electric driving guide rail 7 can move horizontally as a whole along the first electric driving guide rail 6. The clamping mechanism is slidably arranged on one side of the second electric driving guide rail 7 and can move horizontally along the second electric driving guide rail 7. The retaining frame 33 is arranged on the other side of the second electric driving guide rail 7. It should be noted that when the heat exchange tube 5 vertically penetrates through the baffle plate assembly 10 and is inserted in place, the top of the heat exchange tube 5 is lower than the bottom of the retaining frame 33.

[0024] In some specific embodiments, as Figure 6 shown, the obstruction detection mechanism further includes a pressure sensing switch 24 and a connecting frame 16. The connecting frame 16 is arranged in parallel on one side of the retaining frame 33. The connecting frame 16 is located between the second electric driving guide rail 7 and the retaining frame 33, and the connecting frame 16 is fixedly connected to the outer wall of the second electric driving guide rail 7 by bolts or welding. A resilient telescopic member 18 is transversely connected between the connecting frame 16 and the retaining frame 33. The resilient telescopic member 18 includes a telescopic rod connecting the connecting frame 16 and the retaining frame 33, and a compressible spring sleeved outside the telescopic rod. Here, four groups of resilient telescopic members 18 can be arranged at the respective corner positions of the connecting frame 16 and the retaining frame 33. The pressure sensing switch 24 is fixedly installed on one side of the retaining frame 33 close to the connecting frame 16, and the pressure sensing switch 24 is used to control the operation of the longitudinal pushing mechanism. When the resilient telescopic member 18 is in a normal state, the pressure sensing switch 24 does not contact the connecting frame 16.

[0025] In some specific embodiments, in combination with Figure 6 and Figure 10As shown in the figure, the longitudinal pushing mechanism includes a driving motor 17, a pushing rotating column 19 and a synchronization mechanism. A plurality of pushing rotating columns 19 are provided and are longitudinally and equidistantly distributed inside the retaining frame 33. Each pushing rotating column 19 is rotatably connected to the retaining frame 33 through a rotating shaft. All the pushing rotating columns 19 rotate synchronously through the synchronization mechanism. It should be noted that the surface layer of the pushing rotating column 19 is distributed with protrusions or anti-slip grooves to facilitate increasing the friction of contact. The driving motor 17 is fixedly installed on the outer wall of the retaining frame 33, and one of the pushing rotating columns 19 is fixedly connected to the main shaft of the driving motor 17. The driving motor 17 is electrically connected to the pressure induction switch 24.

[0026] When the second electric drive guide rail 7 drives the clamping mechanism holding the heat exchange tube 5 along the first electric drive guide rail 6 and moves closer to the corresponding plate hole position of the baffle plate assembly 10, if the previously placed heat exchange tube 5 is stuck during the downward penetration due to problems such as the aperture size of the baffle plate or the presence of burrs and cannot fall completely, at this time, the retaining frame 33 moving together with the second electric drive guide rail 7 will touch the stuck heat exchange tube 5, and the retaining frame 33 contacts the heat exchange tube 5 by means of the distributed pushing rotating columns 19. At this time, due to the obstruction of the retaining frame 33, the second electric drive guide rail 7 that continues to move horizontally along the first electric drive guide rail 6 will cause the elastic telescopic member 18 between the connecting frame 16 and the retaining frame 33 to be compressed, and the distance between the two becomes smaller. In this way, the pressure induction switch 24 will be squeezed, thereby generating a signal feedback. The control system receives the signal and issues a control command to control the movement of the driving motor 17. The driving motor 17 drives the corresponding pushing rotating column 19 to rotate, and the corresponding pushing rotating column 19 drives all other pushing rotating columns 19 to rotate through the synchronization mechanism. In this way, the distributed pushing rotating columns 19 can apply a downward pushing force to the stuck heat exchange tube 5 to assist it in being inserted in place.

[0027] It should be noted that when the pressure induction switch 24 is squeezed, the feedback signal will be collected by the control system. The control system will temporarily pause the driving mechanism. Only when the obstructed heat exchange tube 5 is inserted in place and the obstruction is removed, the control system will continue to control the driving mechanism to operate to ensure that the clamped heat exchange tube 5 moves to the corresponding position. Each heat exchange tube 5 moving from the starting position of material taking to the set position is a complete action cycle.

[0028] In some specific implementation schemes, refer to Figure 10 As shown in the figure, the synchronization mechanism includes a synchronization wheel 27 and a synchronization belt 28. One end of each pushing rotating column 19 is coaxially and fixedly connected with a synchronization wheel 27. All the synchronization wheels 27 are cooperatively connected with the same synchronization belt 28. In this way, as long as one of the pushing rotating columns 19 rotates, it can drive the synchronization belt 28 to run by relying on the corresponding synchronization wheel 27, so that all the synchronization wheels 27 and the corresponding pushing rotating columns 19 rotate.

[0029] In some specific embodiments, to facilitate further assisting the stuck heat exchange tube 5 to be inserted in place; refer to Figures 6-8 As shown, an impact plate 34 is provided between the connection frame 16 and the stop frame 33, and the impact plate 34 is in contact with the pushing rotating column 19. Guide rods 25 are fixedly connected to both sides of the stop frame 33, and the guide rods 25 horizontally penetrate through the edge of the impact plate 34. The impact plate 34 can slide horizontally along the guide rods 25. A compressible return spring 26 is connected between the impact plate 34 and the guide rods 25. Pushing mechanisms for pushing the impact plate 34 to compress the return spring 26 are provided at both ends of one of the pushing rotating columns 19. Each pushing rotating column 19 is a hollow structure and is made of elastic metal.

[0030] Among them, refer to Figure 7 As shown, the pushing mechanism includes a linkage gear 20, a reduction gear 23, and a pushing rod 21. The linkage gear 20 is coaxially and fixedly connected to one of the pushing rotating columns 19. The reduction gear 23 is rotatably connected to the outer wall of the stop frame 33 through a rotating shaft, and the reduction gear 23 meshes with the linkage gear 20. Here, the diameter of the reduction gear 23 is smaller than that of the linkage gear 20, which is convenient for high-speed transmission when the linkage gear 20 drives the reduction gear 23. The reduction gear 23 is not limited to being provided with one, and multiple reduction gears can be provided. One end of the pushing rod 21 is coaxially and fixedly connected to the reduction gear 23, and the pushing rod 21 is perpendicularly distributed to the rotating shaft of the reduction gear 23. The end of the pushing rod 21 is a spherical end. A convex block 22 matching the end of the pushing rod 21 is provided at the position of the impact plate 34 close to the pushing rod 21, and the bottom position of the convex block 22 is substantially horizontally flush with the central position of the reduction gear 23.

[0031] During the process of the pushing rotating column 19 rotating and pushing the stuck heat exchange tube 5 downward, the corresponding pushing rotating column 19 drives the linkage gear 20 to rotate. The linkage gear 20 then drives the reduction gear 23 to rotate, and the reduction gear 23 drives the push rod 21 to rotate synchronously. When the end of the push rod 21 rotates and contacts the convex block 22, since the distance between the end of the push rod 21 connecting to the reduction gear 23 and the convex block 22 is less than the length of the push rod 21 itself, the push rod 21 can push the convex block 22 and the impact plate 34 to move along the guide rod 25 and compress the return spring 26. At this time, the impact plate 34 is separated from the distributed pushing rotating columns 19. When the push rod 21 rotates to the corresponding position, the end of the push rod 21 is separated from the convex block 22, and the impact plate 34 can rely on the resilience of the return spring 26 to reset and impact the distributed pushing rotating columns 19. Since the pushing rotating column 19 is a hollow structure and made of elastic metal, it can generate vibrations when being impacted and is convenient for transmitting the vibrations to the contacted heat exchange tube 5, so that the heat exchange tube 5 vibrates. The vibration can change the contact state between the heat exchange tube 5 and the plate hole wall from sliding friction to intermittent detachment, reducing the resistance caused by continuous friction. With the cooperation of gravity and the thrust of the pushing rotating column 19, it is convenient to accelerate the vertical insertion of the heat exchange tube 5 in place.

[0032] In some other specific embodiments, referring to Figure 11 As shown, a plurality of universal balls 29 are evenly distributed on the surface of the impact plate 34. Each universal ball 29 is composed of a spherical shell and a sphere movably fitted inside the spherical shell, and part of the sphere is exposed outside the spherical shell. The universal balls 29 facilitate the rotation of the pushing rotating column 19 in contact with the surface layer of the impact plate 34, and at the same time, the universal balls 29 also facilitate the impact plate 34 to impact the pushing rotating column 19 to generate vibrations.

[0033] In some specific embodiments, referring to Figure 5 As shown, the clamping mechanism includes a carriage 15 and clamping blocks 13. The carriage 15 is slidably arranged on the second electric drive rail 7. Two pneumatic telescopic rods 14 are symmetrically and fixedly installed at both ends of the carriage 15. There are two clamping blocks 13, which are respectively fixedly arranged at the telescopic ends of the corresponding pneumatic telescopic rods 14, and the two clamping blocks 13 are symmetrically distributed and are V-shaped clamping bodies. When the top of the heat exchange tube 5 is between the two clamping blocks 13, the two pneumatic telescopic rods 14 are extended to drive the two clamping blocks 13 to clamp the heat exchange tube 5.

[0034] In addition, it should be noted that the clamping block 13 itself has a certain length and only undergoes a slight separation when releasing the heat exchange tube 5, which can ensure that the heat exchange tube 5 will not fall down at the moment of releasing the heat exchange tube 5, thus facilitating its falling and inserting into the plate hole.

[0035] In some specific embodiments, referring to Figure 2 and Figure 3As shown, the tube feeding mechanism includes a support base 2, a stepping motor 30, a fixed support plate 3, and a driving rotating column 31. The support base 2 is arranged on the machine base 1. Here, the support base 2 can be fixed or can be set as a seat body that can be flipped by a motor at a certain angle. The flipping function is mainly to facilitate manual loading of the heat exchange tube 5 at a lower position. The stepping motor 30 is fixedly installed on the support base 2. The fixed support plate 3 is fixedly installed on the support base 2 through a bracket, and there is a through hole in the middle position of the fixed support plate 3. The main shaft of the stepping motor 30 penetrates through the fixed support plate 3. The driving rotating column 31 is arranged on the fixed support plate 3 and is fixedly connected to the end of the main shaft of the stepping motor 30. A plurality of clamping grooves 32 that cooperate with the heat exchange tube 5 are circumferentially and equidistantly arranged on the outer wall of the driving rotating column 31. A limiting ring 4 fixedly connected to the fixed support plate 3 is sleeved outside the driving rotating column 31. A material taking port 12 is arranged on one side of the limiting ring 4 close to the clamping mechanism.

[0036] Whenever a heat exchange tube 5 is placed, the control system controls the coordinated operation of the first electric drive guide rail 6 and the second electric drive guide rail 7, so that the clamping mechanism moves above the material taking port 12 of the limiting ring 4. At this time, there is no heat exchange tube 5 at the material taking port 12. After the two clamping blocks 13 of the clamping mechanism reach above the material taking port 12, corresponding induction switches can be arranged on the limiting ring 4 at the position of the material taking port 12 to sense whether the clamping blocks 13 are in place. After detecting that they are in place, the stepping motor 30 drives the driving rotating column 31 to rotate a certain angle. In this way, the distributed heat exchange tubes 5 are pushed by the driving rotating column 31 to move, so that the corresponding heat exchange tube 5 moves to the position of the material taking port 12. During this process, the top of the corresponding heat exchange tube 5 is exactly between the two clamping blocks 13. Then the pneumatic telescopic rod 14 drives the clamping blocks 13 to clamp against each other, fixedly clamping the top of the heat exchange tube 5, so as to facilitate horizontal removal and move to the corresponding plate hole position for placement.

[0037] It should be noted that the upper surface of the fixed support plate 3 is flush with the upper surface of the baffle plate assembly 10, and the bottom of the stored heat exchange tube 5 is supported on the fixed support plate 3. In this way, after the heat exchange tube 5 is translated above the baffle plate assembly 10, it can directly rely on contact with the corresponding plate hole port position, which is convenient for placement and insertion.

[0038] In some specific implementation schemes, refer to Figure 4As shown in the figure, the positioning mechanism includes a support retaining ring 11 and positioning clamping plates 8. The support retaining ring 11 is fixedly arranged on the machine base 1 through a bracket. There is a certain distance between the bottom of the support retaining ring 11 and the machine base 1 to facilitate pipe threading. A plurality of positioning clamping plates 8 are provided and are circumferentially and equidistantly distributed on the outer circle of the support retaining ring 11. A plurality of electric guide rails 9 are also circumferentially and equidistantly distributed on the machine base 1, and each positioning clamping plate 8 is slidably connected to the corresponding electric guide rail 9. The extension line of each electric guide rail 9 passes through the position below the center of the support retaining ring 11. All the electric guide rails 9 are controlled to operate by the same control switch to facilitate synchronous operation. In addition, the outer diameter of the support retaining ring 11 is smaller than the outer diameter of the baffle plate assembly 10.

[0039] After the assembled baffle plate assembly 10 is placed on the support retaining ring 11, control all the electric guide rails 9 to operate synchronously, so that the circumferentially distributed positioning clamping plates 8 move towards the middle and clamp simultaneously, thereby facilitating the positioning and fixing of the baffle plate assembly 10 and facilitating subsequent pipe threading.

[0040] To facilitate the understanding of this solution embodiment by those skilled in the art, the working principle of this solution will be briefly described in combination with a specific application scenario: First, after the assembled baffle plate assembly 10 is placed on the support retaining ring 11, control all the electric guide rails 9 to operate synchronously, so that the circumferentially distributed positioning clamping plates 8 move towards the middle and clamp simultaneously, thereby facilitating the positioning and fixing of the baffle plate assembly 10; and insert the heat exchange pipe 5 to be used between the driving rotating column 31 and the limit ring 4. Then start the operation of the entire pipe threading machine. The corresponding supporting control system controls the coordinated operation of the first electric drive guide rail 6 and the second electric drive guide rail 7, so that the clamping mechanism moves above the material taking port 12 of the limit ring 4. At this time, there is no heat exchange pipe 5 at the material taking port 12. After the two clamping blocks 13 of the clamping mechanism reach above the material taking port 12, the induction switch arranged at the position of the material taking port 12 can sense whether the clamping blocks 13 are in place. After detecting that they are in place, the stepping motor 30 drives the driving rotating column 31 to rotate a certain angle. In this way, the driving rotating column 31 pushes the distributed heat exchange pipes 5 to move, so that the corresponding heat exchange pipe 5 moves to the position of the material taking port 12. During this process, the top of the corresponding heat exchange pipe 5 is exactly between the two clamping blocks 13. Then the pneumatic telescopic rod 14 drives the clamping blocks 13 to clamp, fixing and clamping the top of the heat exchange pipe 5, thereby facilitating horizontal removal and driving the heat exchange pipe 5 to move above the corresponding perforation position on the baffle plate assembly 10. Then the control system controls the clamping mechanism to loosen, thereby releasing the heat exchange pipe 5, and the heat exchange pipe 5 automatically passes through the baffle plate assembly 10 by gravity without full - process pushing.

[0041] Then, control the clamping mechanism to reset and clamp the next heat exchange tube 5, and perform the feeding and tube threading at the next position. When the second electric drive rail 7 drives the clamping mechanism holding the heat exchange tube 5 along the first electric drive rail 6 and moves closer to the corresponding plate hole position of the baffle plate assembly 10, if the previously fed heat exchange tube 5 gets stuck during the downward threading process due to problems such as the aperture size of the baffle plate or the presence of burrs and cannot fully fall, at this time, the stop frame 33 moving together with the second electric drive rail 7 will touch the stuck heat exchange tube 5, and the stop frame 33 contacts the heat exchange tube 5 by means of the distributed push rotating columns 19. At this time, due to the obstruction of the stop frame 33, when the second electric drive rail 7 continues to traverse along the first electric drive rail 6, the elastic telescopic member 18 between the connecting frame 16 and the stop frame 33 will be compressed, and the distance between the two will become smaller. In this way, the pressure sensing switch 24 will be squeezed, generating a signal feedback. The control system receives the signal and issues a control command to control the movement of the drive motor 17. The drive motor 17 then drives the corresponding push rotating columns 19 to rotate, and the corresponding push rotating columns 19 drive all other push rotating columns 19 to rotate through the synchronization mechanism. In this way, the distributed push rotating columns 19 can apply a downward pushing force to the stuck heat exchange tube 5 to assist it in being inserted in place; and after the stuck heat exchange tube 5 is inserted in place, the blocked drive mechanism can continue to move forward, driving the already clamped heat exchange tube 5 to move to the corresponding plate hole position for feeding.

[0042] And during the process of the push rotating column 19 rotating to push the stuck heat exchange tube 5 downward, the corresponding push rotating column 19 drives the linkage gear 20 to rotate, the linkage gear 20 drives the reduction gear 23 to rotate, and the reduction gear 23 drives the push rod 21 to rotate synchronously. When the end of the push rod 21 rotates and contacts the convex block 22, since the distance between the end of the push rod 21 connecting to the reduction gear 23 and the convex block 22 is less than the length of the push rod 21 itself, the push rod 21 can push the convex block 22 and the impact plate 34 to move along the guide rod 25 and compress the return spring 26. At this time, the impact plate 34 is separated from the distributed push rotating columns 19. When the push rod 21 rotates to the corresponding position, the end of the push rod 21 is separated from the convex block 22, and the impact plate 34 can rely on the resilience of the return spring 26 to reset and impact the distributed push rotating columns 19. Since the push rotating column 19 is a hollow structure and made of elastic metal, it can generate vibration when being impacted and is convenient for transmitting the vibration to the contacted heat exchange tube 5, so that the heat exchange tube 5 vibrates. The vibration can change the contact state between the heat exchange tube 5 and the plate hole wall from sliding friction to intermittent detachment, reducing the resistance caused by continuous friction, and cooperating with the gravity and the thrust of the push rotating columns 19, thus facilitating the acceleration of the vertical insertion of the heat exchange tube 5 in place.

[0043] The above only discloses several specific embodiments of the present invention. However, the embodiments of the present invention are not limited thereto, and any changes that can be thought of by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. An automatic tube threading machine for a heat exchanger tube bundle, comprising a machine base (1), a tube delivery mechanism and a positioning mechanism, wherein the tube delivery mechanism is used to deliver vertically placed heat exchange tubes (5) one by one, and the positioning mechanism is used to vertically position a baffle assembly (10), characterized in that: Also includes: A pipe clamping and delivering mechanism, the pipe clamping and delivering mechanism comprising a clamping mechanism and a driving mechanism, the clamping mechanism being used to clamp the heat exchange tube (5) on the tube delivery mechanism, the driving mechanism driving the clamping mechanism clamping the heat exchange tube (5) to move to above a corresponding plate hole on the baffle assembly (10), and releasing the heat exchange tube (5); An obstruction detection mechanism, the obstruction detection mechanism comprising a baffle frame (33) and a longitudinal pushing mechanism, the baffle frame (33) moves laterally along with the clamping mechanism, the baffle frame (33) is used to detect whether a heat exchange tube (5) longitudinally inserted into the baffle assembly (10) is stuck, and the longitudinal pushing mechanism is arranged on the baffle frame (33), and is used to push the heat exchange tube (5) stuck on the baffle assembly (10) downwards to be inserted into place.

2. The automatic tube threading machine for heat exchanger tube bundle according to claim 1, characterized in that: The drive mechanism comprises a first electric drive rail (6) and a second electric drive rail (7), the first electric drive rail (6) being fixedly mounted on one side of the machine base (1), the second electric drive rail (7) being slidably arranged on the first electric drive rail (6), and the second electric drive rail (7) and the first electric drive rail (6) being perpendicular to each other in the same plane, the clamping mechanism being slidably arranged on one side of the second electric drive rail (7), and the baffle frame (33) being arranged on the other side of the second electric drive rail (7).

3. The automatic tube threading machine for heat exchanger tube bundle according to claim 2, characterized in that: The obstruction detection mechanism further comprises a pressure sensing switch (24) and a connecting frame (16); the connecting frame (16) is arranged in parallel on one side of the blocking frame (33), and the connecting frame (16) is fixedly connected to the second electric drive guide rail (7); an elastic telescopic member (18) is transversely connected between the connecting frame (16) and the blocking frame (33); the pressure sensing switch (24) is fixedly mounted on one side of the blocking frame (33) close to the connecting frame (16), and the pressure sensing switch (24) is used to control the operation of the longitudinal pushing mechanism.

4. The automatic tube threading machine for heat exchanger tube bundle according to claim 3, characterized in that: The longitudinal pushing mechanism comprises a driving motor (17), a pushing rotating column (19) and a synchronization mechanism. A plurality of the pushing rotating columns (19) are provided and are longitudinally equidistantly distributed on the inner side of the baffle frame (33). Each of the pushing rotating columns (19) is rotationally connected to the baffle frame (33) via a rotating shaft. All the pushing rotating columns (19) rotate synchronously via the synchronization mechanism. The driving motor (17) is fixedly mounted on the outer wall of the baffle frame (33), and one of the pushing rotating columns (19) is fixedly connected to the main shaft of the driving motor (17). The driving motor (17) is electrically connected to a pressure sensing switch (24).

5. The automatic tube threading machine for heat exchanger tube bundle according to claim 4, characterized in that: The synchronization mechanism comprises a synchronization wheel (27) and a synchronization belt (28), one end of each of the push rotating columns (19) is coaxially fixedly connected to the synchronization wheel (27), and all of the synchronization wheels (27) are cooperatively connected to the same synchronization belt (28).

6. The automatic tube threading machine for heat exchanger tube bundle according to claim 3, characterized in that: An impact plate (34) is provided between the connection frame (16) and the stop frame (33), and the impact plate (34) contacts the push rotating column (19). Guide rods (25) are fixedly connected to both sides of the stop frame (33), and the guide rods (25) transversely penetrate the edge of the impact plate (34). A return spring (26) is connected between the impact plate (34) and the guide rod (25). Both ends of one of the push rotating columns (19) are provided with a pushing mechanism for pushing the impact plate (34). Each of the push rotating columns (19) is a hollow structure and is made of elastic metal.

7. The automatic tube threading machine for heat exchanger tube bundle according to claim 6, characterized in that: The ejection mechanism comprises a linkage gear (20), a reduction gear (23) and an ejection rod (21); the linkage gear (20) is coaxially fixedly connected to one of the push rotating columns (19); the reduction gear (23) is rotatably connected to the outer wall of the baffle frame (33) via a rotating shaft, and the reduction gear (23) is meshed with the linkage gear (20); one end of the ejection rod (21) is coaxially fixedly connected to the reduction gear (23), and the ejection rod (21) and the reduction gear (23) are vertically distributed; and a protrusion (22) matching the end of the ejection rod (21) is provided at a position of the impact plate (34) close to the ejection rod (21).

8. The automatic tube threading machine for heat exchanger tube bundle according to claim 2, characterized in that: The clamping mechanism comprises a slide (15) and a clamping block (13); the slide (15) is slidably arranged on a second electric drive guide rail (7); pneumatic telescopic rods (14) are symmetrically fixedly mounted at both ends of the slide (15); and two clamping blocks (13) are provided and are respectively fixedly arranged at the telescopic ends of the corresponding pneumatic telescopic rods (14).

9. The automatic tube threading machine for heat exchanger tube bundle according to claim 1, characterized in that: The tube feeding mechanism comprises a support base (2), a stepper motor (30), a fixed support plate (3) and a driving column (31); the support base (2) is arranged on a machine base (1); the stepper motor (30) is fixedly mounted on the support base (2); the fixed support plate (3) is fixedly mounted on the support base (2); the main shaft of the stepper motor (30) passes through the fixed support plate (3); the driving column (31) is arranged on the fixed support plate (3) and is fixedly connected to the main shaft end of the stepper motor (30); a plurality of slots (32) matching the heat exchange tubes (5) are equidistantly provided on the outer wall of the driving column (31); a limiting ring (4) fixedly connected to the fixed support plate (3) is provided on the outer sleeve of the driving column (31); a material taking port (12) is provided on the side of the limiting ring (4) close to the clamping mechanism.

10. The automatic tube threading machine for heat exchanger tube bundle according to claim 1, characterized in that: The positioning mechanism comprises a support ring (11) and a positioning clamping plate (8); the support ring (11) is fixedly arranged on the machine base (1) via a bracket; a plurality of positioning clamping plates (8) are arranged and are circumferentially equidistantly distributed on the outer ring of the support ring (11); a plurality of electric guide rails (9) are also circumferentially equidistantly distributed on the machine base (1), and each of the positioning clamping plates (8) is slidably connected to a corresponding electric guide rail (9).

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