Uniform head tool for U-shaped heat exchange tube
By designing the U-shaped heat exchange pipe uniform workpiece, using the diameter adjustment main rod and the contact monitoring unit, the stable extrusion contact between the heat exchange pipe and the pipe plate is achieved, and the problems of low adjustment efficiency and damage risk in the prior art are solved. Improves the overall efficiency and safety of the heat exchange tube.
Patent Information
- Application Number
- CN202411411256.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-10
- Publication Date
- 2024-12-31
AI Technical Summary
In the prior art, it is difficult to achieve efficient adjustment of the relative position between the heat exchange pipe and the pipe plate, and it is easy to damage the heat exchange pipe, resulting in low adjustment efficiency and pipeline deformation.
A U-shaped heat exchange tube uniform head workpiece is designed, including a diameter adjustment main rod, threaded pipe, diameter adjustment pipe, limit nut, reinforcement nut, elastic limit rope and contact monitoring unit, through adjustment of tip strips and conical noodles Design to achieve stable extrusion contact between the heat exchange tube and the pipe plate, and use an infrared rangefinder to monitor the contact between the tip and the pipe wall to ensure the accuracy and safety of adjustment.
The position adjustment of the heat exchange tube can be completed by a single person, which significantly improves the adjustment efficiency and reduces the risk of damage. The contact monitoring unit effectively avoids invalid pipe extraction, which improves the overall efficiency of the heat exchange tube uniform head.
Smart Images
Figure CN119217317A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a head balancing tool, and in particular to a U-shaped heat exchange tube head balancing tool applied to the technical field related to heat exchangers. Background Art
[0002] For a shell-and-tube heat exchanger, the tube-side assembly consists of two tube sheets and a plurality of heat exchange tubes passing through the two tube sheets. The connection between the two is generally welding. During assembly, it is generally necessary to extend the end of the heat exchange tube 1-2 mm outside the tube sheet. For example, Chinese patent CN118049879A discloses a heat exchange tube and composite tube sheet welding structure. After all the heat exchange tubes are adjusted to protrude uniformly from the tube sheet surface, an automatic welding robot then sequentially welds the ends of the plurality of heat exchange tubes to the tube sheet surface. In this process, if the distance between the tube opening and the outside of the tube sheet is too long or too short, normal welding cannot be performed.
[0003] In the prior art, the relative position of the heat exchange tube and the tube sheet surface is generally controlled by knocking on one side of the tube sheet to make the excessively long heat exchange tube move and extend toward the other side, so that both ends are just extended to 1-2 mm outside the two tube sheets. However, the heat exchanger is large in size, and this process not only requires the cooperation of multiple workers to complete, but also the knocking control distance is difficult to grasp. When the force is too large, it is easy to cause the heat exchange tube to move too much, causing the other end to extend longer outside the tube sheet. When the force is small, it makes it difficult for the pipeline to move stably, resulting in low overall adjustment efficiency. Especially for U-shaped heat exchange tubes, the two ends are located on the same side and the other side is U-shaped, which is easy to cause U-shaped deformation when knocked. Summary of the invention
[0004] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that the prior art adjustment of the relative position between the tube head and the tube sheet of the heat exchange tube is difficult to be greatly adjusted, the efficiency is low, and the heat exchange tube is easily damaged.
[0005] In order to solve the above problems, the present invention provides a U-shaped heat exchange tube head-leveling tool, including a diameter-adjusting main rod, a threaded tube is arranged on the outer sleeve of the diameter-adjusting main rod, and the end of the threaded tube away from the diameter-adjusting main rod is fixedly connected with the diameter-adjusting tube, the diameter-adjusting main rod movably penetrates the threaded tube and the diameter-adjusting tube and extends outside the diameter-adjusting tube, the end of the diameter-adjusting main rod is threadedly connected with a limiting nut, the limiting nut is located on the side of the diameter-adjusting tube away from the threaded tube, a force ring and a reinforcement nut are threadedly connected on the threaded tube, the reinforcement nut and the force ring are in contact with each other, and the reinforcement nut is located on the side of the force ring away from the diameter-adjusting tube, a plurality of uniformly distributed diameter-adjusting holes are drilled on the diameter-adjusting tube, a diameter-adjusting tip bead string is further arranged in the diameter-adjusting tube, the diameter-adjusting tip bead string is sleeved outside the diameter-adjusting main rod and matches the plurality of diameter-adjusting holes, and the diameter-adjusting tip bead string includes a plurality of tip bars and a plurality of elastic limit ropes respectively fixedly connected between two adjacent tip bars; A contact monitoring unit is arranged on the outward end face of the tip bar, a control center and a signal light are fixed on the outer end of the force ring, and both the signal light and the contact monitoring unit are connected to the control chip signal.
[0006] In the above-mentioned U-shaped heat exchange tube head leveling tool, through the setting of this tool, when adjusting the position of the heat exchange tube head, it can be inserted into the heat exchange tube, and then its outer diameter is adjusted so that it is squeezed and fit with the inner wall of the heat exchange tube, thereby temporarily forming a whole. At this time, the heat exchange tube is manually pulled outward or moved outward by a crowbar to a suitable distance. Compared with the existing technology, the process can be completed by one person, and the adjustment difficulty is effectively reduced, and the adjustment efficiency is greatly improved.
[0007] As a further improvement of the present application, the diameter-adjusting main rod includes a T-shaped rod body and a reducing rod fixedly connected to the end of the T-shaped rod body, a limiting nut is connected to the end of the reducing rod, and the diameter of the reducing rod gradually increases in the direction away from the limiting nut.
[0008] As a further improvement of the present application, the tip strip includes an unequal diameter round strip and a conical strip fixedly connected to one end of the unequal diameter round strip near the axis of the diameter adjusting main rod. When the limit nut contacts the end of the diameter adjusting tube, the end of the conical strip away from the axis of the diameter adjusting main rod is located in the diameter adjusting hole and does not exceed the diameter adjusting hole, and the diameter of the unequal diameter round strip is greater than the width of the diameter adjusting hole.
[0009] As a further improvement of the present application, the cross-sections of the two ends of the unequal diameter round bar are both circular, and the diameters of the two circles are different. The ends of the two circles away from the axis of the diameter adjusting main rod are located on the same horizontal straight line, and the line connecting the ends of the two circles close to the axis of the diameter adjusting main rod is parallel to the edge of the diameter reducing rod.
[0010] As a further improvement of the present application, the diameter adjusting hole is inclined, and the angle between the diameter adjusting hole and the central axis of the diameter adjusting main rod is not greater than 15°, the unequal diameter round bar and the diameter adjusting hole are synchronously inclined, and the unequal diameter round bar and the end away from the conical noodle surface are in contact with the surface of the diameter reducing rod.
[0011] As a further improvement of the present application, two detection holes are drilled at one end of the tip bar away from the central axis of the diameter-adjusting main rod. The contact monitoring unit includes two detection needles movably inserted in the two detection holes and a comparison unit arranged inside the tip bar. Elastic telescopic rods are installed at the bottom of the detection needles and the inside of the tip bar, and the upper end of the detection needles extends to the outside of the tip bar.
[0012] As a further improvement of the present application, the detection needle includes a light-proof rod and a light-transmitting rod fixedly connected to the outer end of the light-proof rod, the light-transmitting rod is completely located outside the tip bar, and the light-transmitting rod is a transparent structure.
[0013] As a further improvement of the present application, the comparison unit includes two light receiving grooves drilled inside the tip bar and a connecting tube located between the two detection needles, wherein an infrared rangefinder is installed on the inner wall of one of the light receiving grooves, the transmitting end of the infrared rangefinder is coaxially arranged with the connecting tube, and the infrared rangefinder and the connecting tube are both connected to the detection hole.
[0014] As another improvement of the present application, a light-entering groove is drilled at one end of the light-shielding rod facing the infrared rangefinder, a light-guiding tube is drilled at the center of the light-shielding rod, and the two are interconnected. The inner wall of the light-guiding tube is paved with light-guiding material, and the mouth of the light-guiding tube is in contact with the lower end of the light-transmitting rod.
[0015] In summary, through the setting of the present tooling, when adjusting the position of the tube head of the heat exchange tube, it can be inserted into the heat exchange tube, and then its outer diameter can be adjusted so that it is squeezed and fitted with the inner wall of the heat exchange tube, thereby temporarily forming a whole. At this time, the heat exchange tube can be manually pulled outward or moved outward by a crowbar to a suitable distance. Compared with the prior art, the process can be completed by a single person, and the difficulty of adjustment is effectively reduced, greatly improving the efficiency of adjusting the heads of multiple heat exchange tubes; in addition, with the setting of the contact monitoring unit, it can effectively monitor whether the diameter adjustment tip bead string is fully in contact with the heat exchange tube, effectively ensuring the strength of the present tooling when it is integrated with the heat exchange tube, thereby effectively avoiding the occurrence of invalid tube pulling, and further improving the efficiency of head uniformity for multiple heat exchange tubes. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a schematic diagram of the use of the first embodiment of the present application when adjusting the end of the heat exchange tube; Figure 2 This is a three-dimensional diagram of the overall state of the first embodiment of the present application when not in use; Figure 3 This is a schematic cross-sectional view of part of the diameter-adjusting pipe when the first embodiment of the present application is not in use; Figure 4 This is a schematic diagram of the overall state when the position of the heat exchange tube is being adjusted in the first embodiment of the present application; Figure 5 This is a schematic cross-sectional view of part of the diameter-adjusting pipe when in use according to the first embodiment of the present application; Figure 6 This is a schematic diagram of a radial cross-section of a portion of the diameter-adjustable pipe when the first embodiment of the present application is not in use; Figure 7 This is a schematic diagram of a radial cross-section of a portion of the diameter-adjustable pipe when in use according to the first embodiment of the present application; Figure 8 This is a top view schematic diagram of the first embodiment of the present application when the diameter-adjusting hole is tilted; Fig. 9 This is a three-dimensional schematic diagram of a tip strip according to a second embodiment of the present application; Fig.10This is a transverse schematic diagram of a tip strip according to a second embodiment of the present application; Fig.11 for Fig.10 Schematic diagram at A in the middle; Fig.12 This is a cross-sectional view of a detection needle according to a third embodiment of the present application.
[0017] Description of the numbers in the figure: 1 diameter-adjusting main rod, 11 T-shaped rod body, 12 diameter-reducing rod, 101 limit nut, 2 threaded tube, 3 force ring, 301 reinforcement nut, 4 diameter-adjusting tube, 401 diameter-adjusting hole, 5 tip bar, 51 unequal diameter round bar, 52 cone noodle, 53 elastic limit rope, 7 detection needle, 71 light-shielding rod, 72 light-transmitting rod, 73 elastic telescopic rod, 81 connecting tube, 82 light-receiving groove, 83 infrared rangefinder, 701 light-entering slot, 702 light-guiding tube. DETAILED DESCRIPTION
[0018] Three implementation modes of the present application are described in detail below with reference to the accompanying drawings.
[0019] The first implementation method: Figure 2 A U-shaped heat exchange tube head-leveling tooling is shown, comprising a diameter-adjusting main rod 1, a threaded tube 2 is arranged on the outer surface of the diameter-adjusting main rod 1, and a diameter-adjusting tube 4 is fixedly connected to the end of the threaded tube 2 away from the diameter-adjusting main rod 1, the diameter-adjusting main rod 1 movably penetrates the threaded tube 2 and the diameter-adjusting tube 4 and extends to the outside of the diameter-adjusting tube 4, a limit nut 101 is threadedly connected to the end of the diameter-adjusting main rod 1, and the limit nut 101 is located on the side of the diameter-adjusting tube 4 away from the threaded tube 2, a force ring 3 and a reinforcement nut 301 are threadedly connected to the threaded tube 2, the reinforcement nut 301 is in contact with the force ring 3, and the reinforcement nut 301 is located on the side of the force ring 3 away from the diameter-adjusting tube 4, a plurality of uniformly distributed diameter-adjusting holes 401 are drilled on the diameter-adjusting tube 4, and a diameter-adjusting tip bead string is also arranged in the diameter-adjusting tube 4, and the diameter-adjusting tip bead string is sleeved outside the diameter-adjusting main rod 1 and matches with the plurality of diameter-adjusting holes 401. like Figure 3 and Figure 6 The diameter-adjusting tip bead string includes a plurality of tip bars 5 and a plurality of elastic limiting ropes 53 respectively fixedly connected between two adjacent tip bars. The tip bars 5 include unequal diameter round bars 51 and a conical noodle 52 fixedly connected to the unequal diameter round bars 51 at one end of the axis of the diameter-adjusting main rod 1. The elastic limiting rope 53 is mainly used to connect the plurality of tip bars 5, so that the relative positions of the plurality of tip bars 5 and the diameter-adjusting main rod 1 are not prone to large deviations, and effectively ensure that when the position of the heat exchange tube is adjusted, the plurality of tip bars 5 can stably and synchronously contact the inner wall of the heat exchange tube; like Figure 2-3The diameter-adjusting main rod 1 includes a T-shaped rod body 11 and a reducing rod 12 fixedly connected to the end of the T-shaped rod body 11. The T-shaped rod body 11 matches the inner wall size of the threaded tube 2. A limiting nut 101 is connected to the end of the reducing rod 12. The diameter of the reducing rod 12 gradually increases in a direction away from the limiting nut 101. Figure 6-7 The difference in diameter of the front and rear positions of the reducing rod 12 can effectively adjust the extent to which the multiple tip strips 5 protrude outside the diameter-adjusting tube 4, thereby achieving the effect of diameter adjustment, making it easier for the tool to fully contact the heat exchange tube, thereby stably adjusting the position. When the limit nut 101 contacts the end of the diameter-adjusting tube 4, the end of the conical noodle 52 away from the axis of the diameter-adjusting main rod 1 is located in the diameter-adjusting hole 401 and does not exceed the diameter-adjusting hole 401, and the diameter of the unequal diameter round strip 51 is greater than the width of the diameter-adjusting hole 401, so that when not in use, the position of the multiple tip strips 5 can still be limited by the diameter-adjusting hole 401, making it less likely to have a large position, effectively ensuring subsequent normal use.
[0020] The cross-sections of the two ends of the unequal diameter round bar 51 are both circular, and the diameters of the two circles are different. The ends of the two circles away from the axis of the diameter adjusting main rod 1 are located on the same horizontal straight line, and the line connecting the ends of the two circles close to the axis of the diameter adjusting main rod 1 is parallel to the edge of the diameter reducing rod 12, so that the surface of the diameter reducing rod 12 can fully contact the surface of the unequal diameter round bar 51, and thus when the tooling moves the position of the heat exchange tube outward, the resistance force on the heat exchange tube is more stable.
[0021] It is worth noting that the unequal diameter round bar 51 may not be circular, but may be semicircular, and the curvature of the semicircular non-semicircular surface is completely consistent with the reducing rod 12, so that the contact surface between the unequal diameter round bar 51 and the reducing rod 12 is larger, making the contact between the tip bar 5 and the heat exchange tube more stable.
[0022] like Figure 8 According to actual needs, the diameter adjustment hole 401 can be selectively inclined, and the angle between the diameter adjustment hole 401 and the central axis of the diameter adjustment main rod 1 is not greater than 15°. The unequal diameter round bar 51 and the diameter adjustment hole 401 are synchronously inclined, and the unequal diameter round bar 51 and the end away from the conical surface 52 are in contact with the surface of the diameter reducing rod 12, so that when the heat exchange tube is pulled outward, along the moving direction, the moving paths of all points of the tip bar 5 do not overlap, and along the moving direction, the force range of the heat exchange tube is larger, and the friction force is larger, so that when the heat exchange tube is pulled by the tooling, the two are not easy to have relative displacement, thereby further improving the efficiency of adjusting the end of the heat exchange tube and reducing the occurrence of invalid tube pulling.
[0023] In the above-mentioned U-shaped heat exchange tube head fixture, Figure 1 In the figure, a represents the tube sheet, b represents the heat exchange tube, and c represents the crowbar. Through the setting of this tooling, when adjusting the position of the heat exchange tube head, Figure 2First, pull the diameter-adjusting main rod 1 outward to make the limiting nut 101 close to the diameter-adjusting tube 4. At this time, the smallest outer diameter of the diameter-adjusting rod 12 corresponds to the diameter-adjusting tube 4, and the multiple tip bars 5 are retracted and located in the diameter-adjusting tube 4. At this time, it can be inserted into the heat exchange tube, such as Figure 4-5 , manually hold the focusing ring 3, and then control the diameter-adjusting main rod 1 to move to one side of the diameter-adjusting tube 4, so that the outer diameter of the part where the outer diameter of the reducing rod 12 contacts the tip bar 5 becomes larger and larger, so that multiple tip bars 5 extend out of the diameter-adjusting tube 4, and the extension range becomes larger and larger. At this time, the outer diameter of the diameter-adjusting tube 4 is adjusted until the tip bar 5 contacts the inner wall of the heat exchange tube, thereby being squeezed into contact with the inner wall of the heat pipe and temporarily forming a whole. At this time, manually pull outward or pry by inserting a crowbar between the focusing ring 3 and the tube sheet to move the heat exchange tube outward by a suitable distance. Compared with the prior art, one person can complete the process, and the adjustment difficulty is effectively reduced, and the adjustment efficiency is greatly improved.
[0024] The second implementation method: This embodiment is based on the first embodiment, and a contact monitoring unit is added, and the rest of the parts are consistent with the first embodiment.
[0025] Figure 9-10 As shown, a contact monitoring unit is arranged on the outward end surface of the tip bar 5, a control center and a signal light are fixed on the outer end of the force ring 3, the signal light and the contact monitoring unit are both connected to the control chip signal, and two detection holes are drilled at one end of the tip bar 5 away from the central axis of the diameter-adjusting main rod 1, and the contact monitoring unit includes two detection needles 7 movably inserted in the two detection holes and a comparison unit arranged inside the tip bar 5, as shown in FIG. Fig.11 , an elastic telescopic rod 73 is installed at the bottom of the detection needle 7 and the inside of the tip bar 5, and the upper end of the detection needle 7 extends to the outside of the tip bar 5. The comparison unit includes two light receiving grooves 82 drilled in the inside of the tip bar 5 and a connecting pipe 81 located between the two detection needles 7, an infrared rangefinder 83 is installed on the inner wall of one of the light receiving grooves 82, the transmitting end of the infrared rangefinder 83 is coaxially arranged with the connecting pipe 81, and the infrared rangefinder 83 and the connecting pipe 81 are both connected to the detection hole, when the detection needle 7 moves down to make the light-transmitting rod 72 face the infrared rangefinder 83, the laser beam it emits can pass through the infrared rangefinder 83 and enter the connecting pipe 81, when the two detection needles 7 are synchronized, the laser beam can continue to pass through the other light-transmitting rod 72 and irradiate into the other light receiving groove 82, at this time the data is the largest, when the two detection needles 7 are not synchronized, when the adjacent detection needle 7 moves behind, the data of the infrared rangefinder 83 does not change, when the farther detection needle 7 moves behind, the data of the infrared rangefinder 83 is increased twice to the maximum data.
[0026] When the amplitude of the multiple tip bars 5 protruding out of the diameter-adjusting tube 4 is adjusted by the diameter-adjusting rod 12, the multiple detection needles 7 will first contact the inner wall of the heat exchange tube and be gradually squeezed and move inward. For the same tip bar 5, when the surface of the tip bar 5 is in synchronous contact with the inner wall of the heat exchange tube, the data change on the infrared rangefinder 83 will directly become the maximum. When it is not synchronized, the movement of the two detection needles 7 is not synchronized. At this time, the data of the infrared rangefinder 83 either remains unchanged or increases once, and as the diameter-adjusting main rod 1 continues to move, it will increase again, and the data at this time is the expected maximum data of the infrared rangefinder 83. For multiple For the tip rod 5, when it is stably coaxial with the reducer 12, the movement amplitudes of multiple detection needles 7 are consistent. At this time, the data obtained on the multiple infrared rangefinders 83 change synchronously. During the adjustment process, only when the data on the multiple infrared rangefinders 83 change synchronously and are all maximum data, can it be said that the multiple tip rods 5 are fully and evenly in contact with the inner wall of the heat exchange tube. At this time, the control center will control the signal light to light up, reminding the workers to pull or pry to move the heat exchange tube. Based on the above monitoring, it can effectively ensure that each time the heat exchange tube is moved, the multiple tip rods 5 are in stable contact with it, which can effectively ensure the stable pulling of the tube.
[0027] The maximum data obtained on the infrared rangefinder 83 refers to the situation where the laser beam emitted by the infrared rangefinder 83 can irradiate the inner wall of the infrared rangefinder 83 .
[0028] The detection needle 7 includes a light-proof rod 71 and a light-transmitting rod 72 fixedly connected to the outer end of the light-proof rod 71. The light-transmitting rod 72 is completely located outside the tip bar 5, and the light-transmitting rod 72 is a transparent structure. When the upper surface of the light-transmitting rod 72 is flush with the tip bar 5, the lower end of the light-transmitting rod 72 is just below the axis of the infrared rangefinder 83, and the two are infinitely close but not in contact, so that the infrared rangefinder 83 will generate force data only when the light-transmitting rod 72 completely enters the tip bar 5, that is, when the tip bar 5 contacts the inner wall of the heat exchange tube.
[0029] It is worth noting that, in order to improve the connection strength, after the infrared rangefinder 83 generates force data, the diameter-adjusting main rod 1 can continue to be pushed to increase the resistance between the tip bar 5 and the heat exchange tube.
[0030] In summary, in conjunction with the setting of the contact monitoring unit, when adjusting the relative position of the head of the heat exchange tube and the tube sheet, when the diameter-adjusting tube 4 is inserted into the inside of the heat exchange tube, the diameter-adjusting main rod 1 is continuously moved to expand the diameter of the diameter-adjusting tube 4, which will cause the detection needle 7 to gradually contact the inner wall of the heat exchange tube and be squeezed to move toward the tip bar 5. When the distance data measured by the infrared rangefinder 83 in the multiple tip bars 5 all reach the expected data, it means that the multiple tip bars 5 are in conflict with the inside of the heat exchange tube, and the entire surface of the multiple tip bars 5 is in contact with the inner wall of the heat exchange tube. That is, at this time, the tooling is verified to be close to the heat exchange tube. The tubes are stably formed into one body, and the strength is relatively high. There is no eccentricity between multiple tip strips 5 and the T-shaped rod body 11. At this time, the threaded tube 2 can be moved outward to drive the diameter-adjusting tube 4 and the heat exchange tube to move. Compared with the prior art, it can effectively monitor whether the diameter-adjusting tip bead string is fully in contact with the heat exchange tube, effectively ensure the strength of the tooling when it is integrated with the heat exchange tube, reduce the relative position caused by insufficient resistance strength when pulling the tube, and effectively avoid and reduce the occurrence of invalid pulling, thereby further improving the efficiency of uniform head of multiple heat exchange tubes.
[0031] The third implementation method: This embodiment improves the detection needle 7 on the basis of the second embodiment, and the rest of the parts are consistent with the second embodiment.
[0032] Fig.12 As shown, a light-entering groove 701 is bored at one end of the light-proof rod 71 facing the infrared rangefinder 83, a light-guiding tube 702 is bored at the center of the light-proof rod 71, and the two are connected to each other, the inner wall of the light-guiding tube 702 is paved with light-guiding material, and the mouth of the light-guiding tube 702 is in contact with the lower end of the light-transmitting rod 72. As the plurality of tip bars 5 protrude outward, the laser emitted by the infrared rangefinder 83 can first be irradiated into the light-guiding tube 702 along the light-entering groove 701, and under the action of the light-guiding material, the light beam is guided to the light-transmitting rod 72, so that the light-transmitting rod 72 The rod 72 emits light. At this time, the light can diffuse outward along the gap between the threaded tube 2 and the inner wall of the heat exchange tube, so that the workers can directly observe it. When the detection needle 7 completely enters the tip bar 5, the laser beam directly penetrates the light-transmitting rod 72, and the detection hole is blocked by the inner wall of the heat exchange tube. At this time, the staff cannot see the light source, which further facilitates the staff to understand the connection between the tooling and the heat exchange tube more accurately and intuitively, and effectively ensures the resistance strength without damaging the tube type of the heat exchange tube.
[0033] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.
Claims
1. A U-shaped heat exchange tube head-leveling tool, characterized in that: The invention comprises a diameter-adjusting main rod (1), the outer sleeve of the diameter-adjusting main rod (1) is provided with a threaded tube (2), one end of the threaded tube (2) away from the diameter-adjusting main rod (1) is fixedly connected to the diameter-adjusting tube (4), the diameter-adjusting main rod (1) movably penetrates the threaded tube (2) and the diameter-adjusting tube (4) and extends outside the diameter-adjusting tube (4), the end of the diameter-adjusting main rod (1) is threadedly connected to a limiting nut (101), the limiting nut (101) is located on a side of the diameter-adjusting tube (4) away from the threaded tube (2), and the threaded tube (2) is threadedly connected to a force ring (3) and a reinforcement nut (301) ), the reinforcing nut (301) and the focusing ring (3) are in contact with each other, and the reinforcing nut (301) is located on a side of the focusing ring (3) away from the diameter adjusting tube (4), the diameter adjusting tube (4) is provided with a plurality of evenly distributed diameter adjusting holes (401), the diameter adjusting tube (4) is also provided with a diameter adjusting tip bead string, the diameter adjusting tip bead string is sleeved outside the diameter adjusting main rod (1) and matches with the plurality of diameter adjusting holes (401), the diameter adjusting tip bead string comprises a plurality of tip bars (5) and a plurality of elastic limiting ropes (53) respectively fixedly connected between two adjacent tip bars; The outward end surface of the tip bar (5) is provided with a contact monitoring unit, and the outer end of the support ring (3) is fixed with a control center and a signal light, and the signal light and the contact monitoring unit are both connected to the control chip signal.
2. A U-shaped heat exchange tube head-leveling tool according to claim 1, characterized in that: The diameter-adjusting main rod (1) comprises a T-shaped rod body (11) and a diameter-reducing rod (12) fixedly connected to the end of the T-shaped rod body (11); the limiting nut (101) is connected to the end of the diameter-reducing rod (12); and the diameter of the diameter-reducing rod (12) gradually increases in a direction away from the limiting nut (101).
3. A U-shaped heat exchange tube head-leveling tool according to claim 2, characterized in that: The tip bar (5) comprises an unequal diameter round bar (51) and a conical noodle strip (52) fixedly connected to one end of the unequal diameter round bar (51) close to the axis of the diameter adjusting main rod (1); when the limit nut (101) contacts the end of the diameter adjusting tube (4), the end of the conical noodle strip (52) away from the axis of the diameter adjusting main rod (1) is located in the diameter adjusting hole (401) and does not extend beyond the diameter adjusting hole (401); and the diameter of the unequal diameter round bar (51) is greater than the width of the diameter adjusting hole (401).
4. A U-shaped heat exchange tube head-leveling tool according to claim 3, characterized in that: The cross-sections of the two ends of the unequal diameter round bar (51) are both circular, and the diameters of the two circles are different. The ends of the two circles away from the axis of the diameter adjusting main rod (1) are located on the same horizontal straight line, and the line connecting the ends of the two circles close to the axis of the diameter adjusting main rod (1) is parallel to the edge of the diameter reducing rod (12).
5. The U-shaped heat exchange tube head-leveling tool according to claim 3, characterized in that: The diameter adjustment hole (401) is inclined, and the angle between the diameter adjustment hole (401) and the central axis of the diameter adjustment main rod (1) is not greater than 15 degrees. The unequal diameter round bar (51) and the diameter adjustment hole (401) are synchronously inclined, and the end of the unequal diameter round bar (51) away from the conical noodle strip (52) is in contact with the surface of the diameter reducing rod (12).
6. The U-shaped heat exchange tube head-leveling tool according to claim 1, characterized in that: Two detection holes are drilled at one end of the tip bar (5) away from the central axis of the diameter-adjusting main rod (1), and the contact monitoring unit comprises two detection needles (7) movably inserted into the two detection holes and a comparison unit arranged inside the tip bar (5), an elastic telescopic rod (73) is installed at the bottom of the detection needle (7) and inside the tip bar (5), and the upper end of the detection needle (7) extends to the outside of the tip bar (5).
7. A U-shaped heat exchange tube head-leveling tool according to claim 6, characterized in that: The detection needle (7) comprises a light-proof rod (71) and a light-transmitting rod (72) fixedly connected to the outer end of the light-proof rod (71); the light-transmitting rod (72) is completely located outside the tip bar (5), and the light-transmitting rod (72) is a transparent structure.
8. The U-shaped heat exchange tube head-leveling tool according to claim 7, characterized in that: The comparison unit comprises two light receiving grooves (82) bored inside the tip bar (5) and a connecting tube (81) located between the two detection needles (7), wherein an infrared rangefinder (83) is installed on the inner wall of one of the light receiving grooves (82), the transmitting end of the infrared rangefinder (83) is coaxially arranged with the connecting tube (81), and the infrared rangefinder (83) and the connecting tube (81) are both connected to the detection hole.
9. A U-shaped heat exchange tube head-leveling tool according to claim 8, characterized in that: A light-entering slot (701) is bored at one end of the light-shielding rod (71) facing the infrared rangefinder (83), a light-guiding tube (702) is bored at the center of the light-shielding rod (71), and the two are interconnected, a light-guiding material is laid on the inner wall of the light-guiding tube (702), and the mouth of the light-guiding tube (702) contacts the lower end of the light-transmitting rod (72).