A main water pipe polishing device and method for heat exchanger processing

Abstract

The application discloses a main water pipe polishing device and method for heat exchanger processing and relates to the technical field of water pipe polishing equipment. The main water pipe polishing device for heat exchanger processing is characterized in that the bottom of the polishing block is tightly attached to the heat conduction plate, local high temperature generated during grinding can be quickly transferred to the heat conduction oil in the heat conduction oil pipe through the heat conduction plate and the heat conduction rod, and instant heat dissipation of the polishing contact area is realized. Meanwhile, by utilizing the physical property of heat conduction oil that expands when heated, a directional annular flow loop is formed in cooperation with the first and second one-way valves, the high-temperature heat conduction oil automatically flows into the annular heat dissipation pipe for heat dissipation, and the low-temperature heat conduction oil is supplemented to the heat conduction oil pipe, so that continuous circulation cooling can be realized without external power, thereby eliminating local high temperature through continuous heat dissipation, avoiding the problems of thermal deformation such as bending, ovalization and size out-of-tolerance of the inner wall of the main water pipe caused by uneven thermal expansion and contraction, improving the polishing quality of products, and significantly improving the processing yield and use performance of the main water pipe of the heat exchanger.

Description

Technical Field

[0001] This invention relates to the field of water pipe polishing equipment technology, specifically to a main water pipe polishing device and method for heat exchanger processing. Background Technology

[0002] In the manufacturing process of heat exchangers, the main water pipe is the core pipeline component of the heat exchange system. The quality of the grinding treatment of its pipe openings, inner and outer walls, and weld surfaces directly affects the subsequent welding sealing, the adhesion of the anti-corrosion coating, and the pipeline flow performance.

[0003] Referring to the patent application with publication number CN120985447A, a pipe inner wall grinding device is disclosed. The device uses a limiting ring, a limiting plate, and a positioning ring to limit the metal pipe, ensuring stable grinding. The motor drives the grinding wheel to rotate, which, together with the first hydraulic cylinder, pushes to achieve comprehensive grinding. At the same time, the polyester fiber adsorption roller on the grinding wheel can effectively adhere to the metal dust generated during grinding, preventing dust accumulation from affecting the grinding quality and interfering with the movement of the grinding wheel, thus improving the grinding effect and efficiency.

[0004] The existing pipe inner wall grinding equipment described above has the following drawbacks in practical use:

[0005] 1) During the grinding process, a large amount of local high temperature will be generated in the grinding area. Traditional equipment does not have a dedicated heat dissipation structure. The heat accumulation can easily cause uneven thermal expansion and contraction of the main water pipe, resulting in thermal deformation, ellipticization, or even dimensional deviation of the pipe wall, which greatly reduces the yield and product performance.

[0006] 2) In addition, although the adsorption roller in the above patent can adsorb some metal dust, there will still be a large amount of grinding dust flying around without organization, which not only pollutes the production environment and endangers the health of operators, but also adheres to the inner wall and affects the grinding quality. Furthermore, conventional dust removal equipment requires an additional power source, which is complex in structure and has high energy consumption.

[0007] Therefore, the present invention proposes a grinding device and method for main water pipes in heat exchanger processing to solve the above problems. Summary of the Invention

[0008] To address the shortcomings of existing technologies, this invention provides a grinding device and method for main water pipes in heat exchanger processing. It solves the problems of existing grinding equipment generating large amounts of localized high temperatures at the grinding area, traditional equipment lacking a dedicated heat dissipation structure, heat accumulation easily causing uneven thermal expansion and contraction of the main water pipe, resulting in pipe wall thermal deformation, ellipticization, or even dimensional deviations, significantly reducing yield and product performance. Moreover, grinding dust flies out unorganized, polluting the production environment, endangering the health of operators, and adhering to the inner wall, affecting grinding quality. Furthermore, conventional dust removal equipment requires an additional power source, resulting in complex structures and high energy consumption.

[0009] To achieve the above objectives, the present invention provides the following technical solution: a main water pipe grinding device for heat exchanger processing, comprising a processing table, and further comprising:

[0010] The water pipe lower limit assembly is located on the right side of the top of the processing table. It is used to support the main water pipe of the heat exchanger to be polished and drive it to rotate during the polishing process. Two slide rails are also fixedly installed on the top right side of the processing table to provide movement guidance for the water pipe lower limit assembly.

[0011] Multiple upper limit components for water pipes are evenly arranged on one side of the lower limit component for water pipes. They are used to cooperate with the lower limit component to limit the main water pipe of the heat exchanger from above, so as to ensure the rotational stability of the main water pipe of the heat exchanger.

[0012] The grinding mechanism is located on the left side of the top of the processing table. It is used to grind the inner wall of the main water pipe of the heat exchanger and automatically suck up the grinding dust during the grinding process. At the same time, it continuously dissipates heat and cools the part in contact with the inner wall of the main water pipe of the heat exchanger to avoid uneven thermal expansion and contraction caused by local high temperature, which could lead to thermal deformation of the main water pipe of the heat exchanger.

[0013] The control box is fixedly installed on the top left side of the processing table and is used to control the operation of all electrical equipment.

[0014] Furthermore, the lower limit assembly of the water pipe includes a bidirectional lead screw rotatably mounted on the top of the processing table via a mounting bracket. A first threaded sleeve and a second threaded sleeve are symmetrically arranged on both sides of the outer wall of the bidirectional lead screw. The first threaded sleeve and the second threaded sleeve form a threaded engagement with the outer wall of the bidirectional lead screw. Under the drive of the bidirectional lead screw, the first threaded sleeve and the second threaded sleeve can synchronously move closer or further away from each other. A long rotating shaft rotatably passes through the interior of each of the first threaded sleeve and the second threaded sleeve. Sliding sleeves are rotatably arranged at both ends of the long rotating shaft. A first lifting roller and a second lifting roller are respectively fixedly sleeved on the outer wall of the long rotating shaft and located on both sides of the bidirectional lead screw. A drive motor is also slidably arranged on one side of the top of the processing table. The output shaft of the drive motor is connected to the end of one of the long rotating shafts through a coupling.

[0015] Furthermore, the water pipe upper limit assembly includes an L-shaped bracket fixedly mounted on the side wall of the processing table. A first cylinder is fixedly mounted on the top of the L-shaped bracket. The output shaft of the first cylinder slides through the L-shaped bracket and is fixedly mounted on a wheel frame. A first roller and a second roller are symmetrically rotated on both sides inside the wheel frame.

[0016] Furthermore, the grinding mechanism includes two cross-shaped slide rails fixedly installed on the front and rear sides of the top of the processing table. A sliding seat is slidably fitted on the outer wall of the two cross-shaped slide rails. A second cylinder is also fixedly installed on one side of the top of the processing table. The output shaft of the second cylinder is fixedly connected to the sliding seat and is used to push the sliding seat to move along the outer wall of the cross-shaped slide rail. A servo motor is fixedly installed on the side wall of the sliding seat near the side wall of the second cylinder. The output shaft of the servo motor rotates through the sliding seat and is fixedly installed with an upper pulley. A lower pulley is rotatably installed on the side wall of the sliding seat and below the upper pulley. A toothed belt is fitted on the outer wall of the upper pulley and the lower pulley. A drive shaft is fixedly installed at one end of the lower pulley. A grinding mechanism for grinding the main water pipe of the heat exchanger is installed at the end of the drive shaft away from the sliding seat. The servo motor cycles between a set first speed and a second speed. The first speed is less than the second speed, and the switching interval between the first speed and the second speed is five minutes.

[0017] Furthermore, the grinding mechanism includes an outer cylinder that is detachably mounted on one end of the drive shaft by bolts. Multiple sets of dust collection channels are evenly opened on the outer wall of the outer cylinder. Each set of dust collection channels is composed of multiple dust suction holes arranged at equal intervals. Multiple grinding block mounting slots are also evenly opened on the outer wall of the outer cylinder along the circumference. A grinding block is detachably mounted inside the grinding block mounting slot by bolts. The side of the grinding block away from the grinding block mounting slot is designed as an arc surface and protrudes from the grinding block mounting slot, for contacting the inner wall of the main water pipe of the heat exchanger. Multiple heat conduction plate mounting slots are also evenly opened at the bottom of the grinding block mounting slot.

[0018] Furthermore, an annular heat dissipation pipe is fixedly installed at one end of the outer cylinder near the drive shaft. Multiple heat exchange units connected to the annular heat dissipation pipe are evenly arranged on one side of the pipe. Each heat exchange unit includes a heat-conducting oil pipe fixedly installed on the inner wall of the outer cylinder. A short conduit for inputting its internal heat-conducting oil into the annular heat dissipation pipe is fixedly installed on one side of the heat-conducting oil pipe. A first one-way valve allowing only heat-conducting oil to flow out of the short conduit is fixedly installed inside the short conduit. A long conduit for inputting heat-conducting oil from the annular heat dissipation pipe into the heat-conducting oil pipe is also fixedly installed on one side of the heat-conducting oil pipe. A second one-way valve allowing only heat-conducting oil to flow into the heat-conducting oil pipe is fixedly installed inside the long conduit. Multiple heat-conducting rods are evenly fixedly installed inside the heat-conducting oil pipe. One end of each heat-conducting rod penetrates the heat-conducting oil pipe and the outer wall of the outer cylinder and is fixedly fitted with a heat-conducting plate. The heat-conducting plate is fixedly installed in a heat-conducting plate mounting groove. The other ends of both the short and long conduits are connected to the annular heat dissipation pipe.

[0019] Furthermore, an inner cylinder is coaxially fixed inside the outer cylinder. A piston is slidably and sealed inside the inner cylinder. A return spring is fixed between the piston and the inner wall of the inner cylinder. A guide block is also fixed on the outer wall of the piston. A guide groove adapted to the structure of the guide block is formed on the inner wall of the inner cylinder. A sliding fit is formed between the guide block and the guide groove. Two centrifugal components are symmetrically arranged at the upper and lower positions of the piston away from the return spring. They are used to push the piston towards the annular heat dissipation pipe using centrifugal force. A dust capture unit for collecting grinding dust is also provided on the side of the inner cylinder near the centrifugal components. Multiple dust conduits connected to the interior are uniformly fixed on the outer wall of the inner cylinder. A dust collection pipe is fixedly provided at the end of the dust conduit away from the inner cylinder. A third one-way valve that only allows gas to enter the inner cylinder is fixedly provided inside the dust collection pipe. The dust collection pipe is fixedly installed on the inner wall of the outer cylinder.

[0020] Furthermore, the centrifugal assembly includes a centrifuge chamber fixedly mounted at the piston end. A centrifugal slider is slidably mounted inside the centrifuge chamber. An L-shaped rod is fixedly mounted at the bottom of the centrifugal slider, which slides through the centrifuge chamber and extends to the outside. A guide wheel is rotatably mounted at the end of the L-shaped rod away from the centrifuge chamber. An inclined plate is fixedly mounted on the inner wall of the inner cylinder, and the guide wheel slides along the inclined surface of the inclined plate. An clearance hole is provided at the top of the centrifugal slider. A guide post adapted to the clearance hole structure is fixedly mounted at the top of the inner cavity of the centrifuge chamber. The clearance hole is slidably sleeved on the outer wall of the guide post. A tension spring for pushing the centrifugal slider to reset is slidably mounted on the outer wall of the guide post between the centrifugal slider and the centrifuge chamber.

[0021] Furthermore, the dust capture unit includes a dust collection cylinder fixedly installed on the inner wall of the inner cylinder. One end of the dust collection cylinder near the piston is threadedly connected to a conical guide cylinder, and the other end is threadedly connected to a baffle. Multiple exhaust channels are evenly opened on the inner wall of the inner cylinder near the dust collection cylinder, which are used to discharge the gas in the dust collection cylinder into the gap between the inner cylinder and the outer cylinder through the exhaust channels.

[0022] This invention also discloses a method for polishing the main water pipe used in heat exchanger processing, the method comprising the following steps:

[0023] Step 1, Loading and Positioning: Place the main water pipe of the heat exchanger to be polished in the lifting position of the lower limit component of the water pipe. Rotate the adjusting part of the lower limit component of the water pipe to adapt the lower limit component of the water pipe to the diameter of the main water pipe and complete the initial lifting. Then, operate the upper limit component of the water pipe to press and limit it from above the main water pipe. Together with the lower limit component of the water pipe, the main water pipe is coaxially fixed, ensuring the rotational stability of the main water pipe during the polishing process. The movement of the lower limit component of the water pipe is guided by the slide rail throughout the process.

[0024] Step 2, Grinding preparation: Start all electrical equipment through the control box, control the grinding mechanism to move along the processing direction to the grinding inlet of the main water pipe, adjust the contact position between the grinding end of the grinding mechanism and the inner wall of the main water pipe, and at the same time turn on the dust suction and heat dissipation cooling functions of the grinding mechanism, and set all parameters before grinding.

[0025] Step 3, Rotary Grinding: The control box controls the lower limit component of the water pipe to drive the main water pipe to rotate at a constant speed around its own axis. At the same time, the grinding mechanism is controlled to perform grinding operations on the inner wall of the main water pipe. During the grinding process, the grinding mechanism automatically sucks up the grinding dust and continuously dissipates heat and cools the parts in contact with the inner wall of the main water pipe to avoid thermal deformation of the main water pipe caused by local high temperature.

[0026] Step 4, Unloading and Finishing: After the main water pipe is polished, first turn off the grinding, dust suction and heat dissipation functions of the grinding mechanism through the control box, then control the upper limit component of the water pipe to reset and release the upper limit, then adjust the lower limit component of the water pipe to release the lifting limit of the main water pipe, remove the polished main water pipe, and finally turn off all electrical equipment through the control box to complete this polishing operation.

[0027] This invention provides a grinding device and method for main water pipes in heat exchanger processing. Compared with the prior art, it has the following advantages:

[0028] 1. A grinding device and method for main water pipes in heat exchanger processing, wherein the grinding block is tightly attached to the heat-conducting plate at its bottom, and the local high temperature generated by grinding can be quickly transferred to the heat-conducting oil in the heat-conducting oil pipe through the heat-conducting plate and heat-conducting rod, thereby achieving instant heat dissipation in the grinding contact area; at the same time, utilizing the physical property of heat-conducting oil to expand when heated, a directional annular flow loop is formed with the first and second one-way valves, and the high-temperature heat-conducting oil automatically flows into the annular heat dissipation pipe for heat dissipation, while the low-temperature heat-conducting oil is replenished to the heat-conducting oil pipe, so that continuous circulating cooling can be achieved without external power, thereby eliminating local high temperature through continuous heat dissipation, avoiding thermal deformation problems such as bending, ellipticization, and dimensional deviation caused by uneven thermal expansion and contraction of the inner wall of the main water pipe, and significantly improving the yield and performance of the main water pipe in heat exchanger processing.

[0029] 2. A grinding device and method for main water pipes in heat exchanger processing, which utilizes the centrifugal force generated by the rotation of the grinding mechanism to drive a centrifugal component, pushing a piston to move and create negative pressure. Grinding dust is drawn in real time through a dust suction hole, a dust collection pipe, and a dust conduit. The suction power is synchronized with the grinding action, eliminating the need for an additional fan, thus saving energy and simplifying the structure. The servo motor cycles between high and low speeds. At low speeds, when the centrifugal force is insufficient, the piston is reset by the action of a return spring, pushing the dust drawn into the inner cylinder to the dust collection cylinder for centralized storage, achieving integrated automatic operation of "suction-collection". Secondly, the triple anti-backflow design of the third one-way valve, conical guide cylinder, and baffle ensures that dust only enters and does not exit, completely solving the problems of dust flying, polluting the environment, and harming the health of operators caused by traditional grinding. The working environment is more environmentally friendly. Moreover, the dust collection cylinder adopts a threaded connection structure and is equipped with a detachable end cap, which can be quickly disassembled and cleaned after operation, making maintenance and operation simple and efficient.

[0030] 3. A grinding device and method for main water pipes in heat exchanger processing. The grinding block is fixed in the grinding block mounting groove by bolts. It can be quickly replaced individually after wear, without the need to replace the entire grinding head, reducing consumable costs and downtime. Moreover, the grinding mechanism can be disassembled from the drive shaft, which facilitates the inspection and maintenance of internal heat dissipation pipes, centrifugal components, and dust collection cylinders, greatly improving the convenience of equipment maintenance. In addition, the gap between the inner and outer cylinders serves as both exhaust and auxiliary heat dissipation functions, with orderly airflow that does not interfere with dust collection and heat transfer oil circulation, and each functional channel does not interfere with each other.

[0031] 4. A grinding device and method for main water pipes in heat exchanger processing, wherein a lower limiting component for the water pipe uses a bidirectional screw rod in conjunction with a first and second threaded sleeve to drive the two lifting rollers to move synchronously in opposite directions or in opposite directions, which can quickly adapt to the main water pipes of heat exchangers with different outer diameters without replacing the lifting components, greatly improving the equipment's versatility and reducing the processing cost of multiple specifications; moreover, the bottom of the drive motor is equipped with a sliding seat and a sliding groove, which can move synchronously with the position of the lifting rollers, always ensuring that the power output shaft and the long rotating shaft are coaxially connected, and the power transmission is stable and without deviation. There is no need to recalibrate the transmission structure during the adjustment process, making the operation convenient and efficient; and the upper limiting component for the water pipe uses a first cylinder to drive the double rollers to press down. The rollers can adapt to the curvature of the outer wall of the water pipe, and together with the lower lifting rollers, they form a flexible clamp, which can achieve stable limiting for different pipe diameters without clamping dead angles. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the first overall three-dimensional structure of the present invention;

[0033] Figure 2 This is a schematic diagram of the second overall three-dimensional structure of the present invention;

[0034] Figure 3 This is a schematic diagram of the water pipe lower limit component structure of the present invention;

[0035] Figure 4 This is a schematic diagram of the upper limit positioning component of the water pipe of the present invention;

[0036] Figure 5 This is a schematic diagram of the grinding mechanism structure of the present invention;

[0037] Figure 6 This is a schematic diagram of the first disassembled state of the grinding mechanism of the present invention;

[0038] Figure 7 This is a cross-sectional view of the grinding mechanism of the present invention;

[0039] Figure 8 For the present invention Figure 7 A magnified structural diagram of part A in the diagram;

[0040] Figure 9 This is a schematic diagram of the second disassembled state structure of the grinding mechanism of the present invention;

[0041] Figure 10 This is a schematic cross-sectional view of the heat exchange unit of the present invention;

[0042] Figure 11 For the present invention Figure 10 A magnified structural diagram of part B in the diagram;

[0043] Figure 12 For the present invention Figure 10 A magnified structural diagram of part C in the diagram;

[0044] Figure 13 This is a schematic diagram of the first assembled state of the dust duct and inner cylinder of the present invention;

[0045] Figure 14 This is a schematic diagram of the second assembly state of the dust duct and inner cylinder of the present invention;

[0046] Figure 15 This is a schematic diagram of the decomposed structure of the dust capture unit of the present invention.

[0047] In the diagram: 1. Processing table; 2. Lower limit assembly for water pipe; 21. Bidirectional lead screw; 22. First threaded sleeve; 23. Second threaded sleeve; 24. Long rotating shaft; 25. Sliding sleeve; 26. First lifting roller; 27. Second lifting roller; 3. Upper limit assembly for water pipe; 31. L-shaped bracket; 32. First cylinder; 33. Wheel frame; 34. First roller; 35. Second roller; 4. Grinding mechanism; 41. Cross-shaped slide rail; 42. Sliding seat; 43. Second cylinder; 44. Servo motor; 45. Upper pulley; 46. Lower pulley; 47. Toothed belt; 48. Drive shaft; 49. Grinding mechanism; 491. Outer cylinder; 492. Dust suction hole; 493. Grinding block mounting slot; 494. Grinding block; 495. Heat conduction plate Mounting slot; 496, Annular heat dissipation pipe; 497, Heat transfer oil pipe; 498, Short conduit; 499, First one-way valve; 4910, Long conduit; 4911, Second one-way valve; 4912, Heat transfer rod; 4913, Heat transfer plate; 4914, Inner cylinder; 4915, Piston; 4916, Return spring; 4917, Centrifugal assembly; a1, Centrifuge box; a2, Centrifugal slider; a3, L-shaped rod; a4, Guide wheel; a5, Inclined plate; a6, Clearance hole; a7, Guide column; a8, Tension spring; 4918, Dust collection cylinder; 4919, Conical guide cylinder; 4920, Baffle; 4921, Dust conduit; 4922, Dust collection pipe; 4923, Third one-way valve; 5, Control box; 6, Slide rail. Detailed Implementation

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] This invention provides two technical solutions: a main water pipe grinding device for heat exchanger processing, specifically including the following embodiments:

[0050] like Figures 1-5 The first embodiment is shown: a main water pipe polishing device for heat exchanger processing, including a processing table 1, and further comprising:

[0051] The water pipe lower limit assembly 2 is located on the right side of the top of the processing table 1. It is used to support the main water pipe of the heat exchanger to be polished and drive it to rotate during the polishing process. Two slide rails 6 are also fixedly installed on the right side of the top of the processing table 1 to provide movement guidance for the water pipe lower limit assembly 2. The water pipe lower limit assembly 2 includes a bidirectional lead screw 21 that is rotatably mounted on the top of the processing table 1 via a mounting bracket. A first threaded sleeve 22 and a second threaded sleeve 23 are symmetrically arranged on both sides of the outer wall of the bidirectional lead screw 21. The first threaded sleeve 22, the second threaded sleeve 23 and the outer wall of the bidirectional lead screw 21 form a thread. In coordination, driven by the bidirectional lead screw 21, the first threaded sleeve 22 and the second threaded sleeve 23 can synchronously move closer or further apart. A long rotating shaft 24 rotatably passes through the interior of both the first threaded sleeve 22 and the second threaded sleeve 23. Sliding sleeves 25 are rotatably mounted at both ends of the long rotating shaft 24. A first lifting roller 26 and a second lifting roller 27 are respectively fixedly mounted on the outer wall of the long rotating shaft 24 on both sides of the bidirectional lead screw 21. A drive motor is also slidably mounted on one side of the top of the processing table 1. The output shaft of this drive motor is connected to the end of one of the long rotating shafts 24 via a coupling. A handwheel for easy rotation is fixedly mounted at one end of the bidirectional lead screw 21. The bottom of the mounting bracket is fixedly mounted on the top of the processing table 1 by bolts. A sliding seat is fixedly mounted at the bottom of the drive motor, and a sliding groove adapted to the sliding seat is fixedly mounted on the top of the processing table 1. A sliding fit is formed between the sliding seat and the sliding groove. When the position of the first lifting roller 26 changes, the position of the drive motor can change synchronously.

[0052] Multiple upper limit components 3 of water pipes are evenly arranged on one side of the lower limit component 2 of water pipes. They are used to cooperate with the lower limit component 2 of water pipes to limit the main water pipe of the heat exchanger from above, so as to ensure the rotational stability of the main water pipe of the heat exchanger. The upper limit component 3 of water pipes includes an L-shaped bracket 31 fixedly installed on the side wall of the processing table 1. A first cylinder 32 is fixedly installed on the top of the L-shaped bracket 31. The output shaft of the first cylinder 32 slides through the L-shaped bracket 31 and is fixedly installed with a wheel frame 33. The inner sides of the wheel frame 33 are symmetrically arranged with a first roller 34 and a second roller 35.

[0053] The grinding mechanism 4 is located on the left side of the top of the processing table 1. It is used to grind the inner wall of the main water pipe of the heat exchanger and automatically suck up the grinding dust during the grinding process. At the same time, it continuously dissipates heat and cools the part in contact with the inner wall of the main water pipe of the heat exchanger to avoid uneven thermal expansion and contraction caused by local high temperature, which could lead to thermal deformation of the main water pipe of the heat exchanger.

[0054] The control box 5 is fixedly installed on the top left side of the processing table 1 and is used to control the operation of all electrical equipment.

[0055] In this embodiment, the grinding mechanism 4 includes two cross-shaped slide rails 41 fixedly disposed on the front and rear sides of the top of the processing table 1. A sliding seat 42 is slidably sleeved on the outer wall of the two cross-shaped slide rails 41. A second cylinder 43 is also fixedly disposed on one side of the top of the processing table 1. The output shaft of the second cylinder 43 is fixedly connected to the sliding seat 42 and is used to push the sliding seat 42 to move along the outer wall of the cross-shaped slide rails 41. A servo motor 44 is fixedly disposed on the side wall of the sliding seat 42 near the second cylinder 43. The output shaft of the servo motor 44 rotates through the sliding seat 42 and is fixedly disposed on the upper skin. A lower pulley 46 is rotatably mounted on the side wall of the upper pulley 45 and below the sliding seat 42. A toothed belt 47 is fitted onto the outer walls of both the upper pulley 45 and the lower pulley 46. A drive shaft 48 is fixedly mounted on one end of the lower pulley 46. A grinding mechanism 49 for grinding the main water pipe of the heat exchanger is mounted on the end of the drive shaft 48 away from the sliding seat 42. The servo motor 44 cycles between a set first speed and a second speed, where the first speed is less than the second speed, and the switching interval between the first and second speeds is five minutes. At the first speed, the centrifugal force is less than the tension spring a8, making it impossible for the centrifugal slider a2 to overcome the tension spring a8 and slide away from the axis of the piston 4915.

[0056] like Figures 6-15 The second embodiment is shown, which differs from the first embodiment in that: the grinding mechanism 49 includes an outer cylinder 491 that is detachably mounted on one end of the drive shaft 48 by bolts. Multiple sets of dust collection channels are evenly opened on the outer wall of the outer cylinder 491. Each set of dust collection channels is composed of multiple dust suction holes 492 arranged at equal intervals. Multiple grinding block mounting grooves 493 are also evenly opened on the outer wall of the outer cylinder 491 along the circumference. Grinding blocks 494 are detachably mounted inside the grinding block mounting grooves 493 by bolts. The side of the grinding block 494 away from the grinding block mounting grooves 493 is designed as an arc surface and protrudes from the grinding block mounting grooves 493 for contacting the inner wall of the main water pipe of the heat exchanger. Multiple heat conduction plate mounting grooves 495 are also evenly opened at the bottom of the grinding block mounting grooves 493. The outer cylinder 491 is also provided with an end cap that is detachable by bolts at the end away from the drive shaft 48. Multiple exhaust ports are evenly provided on the end cap, and the exhaust ports are connected to the gap between the inner cylinder 4914 and the outer cylinder 491.

[0057] In this embodiment, an annular heat dissipation pipe 496 is fixedly installed at one end of the outer cylinder 491 near the drive shaft 48. Multiple heat exchange units connected to the annular heat dissipation pipe 496 are evenly arranged on one side of the annular heat dissipation pipe 496. Each heat exchange unit includes a heat-conducting oil pipe 497 fixedly installed on the inner wall of the outer cylinder 491. A short conduit 498 for inputting its internal heat-conducting oil into the annular heat dissipation pipe 496 is fixedly installed on one side of the heat-conducting oil pipe 497. A first one-way valve 499, allowing only heat-conducting oil to flow out of the heat-conducting oil pipe 497, is fixedly installed inside the short conduit 498. A useful... A long conduit 4910 is used to input the heat transfer oil from the annular heat sink 496 into the heat transfer oil pipe 497. A second one-way valve 4911, which only allows heat transfer oil to flow into the heat transfer oil pipe 497, is fixedly installed inside the long conduit 4910. Multiple heat transfer rods 4912 are uniformly fixed inside the heat transfer oil pipe 497. One end of each heat transfer rod 4912 penetrates the heat transfer oil pipe 497 and the outer wall of the outer cylinder 491 and is fixedly fitted with a heat transfer plate 4913. The heat transfer plate 4913 is fixedly installed in a heat transfer plate mounting groove 495. The other ends of both the short conduit 498 and the long conduit 4910 are connected to the annular heat sink 496. The end of the short conduit 498 inside the heat transfer oil pipe 497 is positioned close to the annular heat sink 496, while the end of the long conduit 4910 inside the heat transfer oil pipe 497 is positioned away from the annular heat sink 496, ensuring that the heat transfer oil flows in an annular trajectory within the heat transfer oil pipe 497. The top of the heat-conducting plate 4913 and the bottom of the grinding block mounting groove 493 are at the same height. After the grinding block 494 and the grinding block mounting groove 493 are installed, the top of the grinding block 494 can fit against the top of the heat-conducting plate 4913.

[0058] In this embodiment, an inner cylinder 4914 is coaxially fixed inside the outer cylinder 491. A piston 4915 is slidably and sealed inside the inner cylinder 4914. A return spring 4916 is fixedly installed between the piston 4915 and the inner wall of the inner cylinder 4914. A guide block is also fixedly installed on the outer wall of the piston 4915. A guide groove adapted to the structure of the guide block is formed on the inner wall of the inner cylinder 4914. A sliding fit is formed between the guide block and the guide groove. Two centrifugal components 4917 are symmetrically arranged at the upper and lower positions of the piston 4915 away from the return spring 4916, which are used to push the piston using centrifugal force. The plug 4915 moves closer to the annular heat dissipation pipe 496. Inside the inner cylinder 4914, near the centrifugal assembly 4917, a dust capture unit for collecting grinding dust is also provided. Multiple dust conduits 4921 connected to the interior are uniformly fixed on the outer wall of the inner cylinder 4914. A dust collecting pipe 4922 is fixedly provided at the end of the dust conduit 4921 away from the inner cylinder 4914. A third one-way valve 4923 that only allows gas to enter the inner cylinder 4914 is fixedly provided inside the dust collecting pipe 4922. The dust collecting pipe 4922 is fixedly provided on the inner wall of the outer cylinder 491. The positions of multiple dust collection pipes 4922 and multiple sets of dust collection channels are set in a one-to-one correspondence. Each dust collection pipe 4922 covers one set of dust collection channels. That is, multiple dust suction holes 492 in one set are connected to the dust collection pipe 4922. The dust conduit 4921 is located between the piston 4915 and the conical guide tube 4919 to ensure that the grinding dust enters the inner cylinder 4914 through the dust conduit 4921.

[0059] In this embodiment, the centrifuge assembly 4917 includes a centrifuge box a1 fixedly disposed at the end of the piston 4915. A centrifuge slider a2 is slidably disposed inside the centrifuge box a1. An L-shaped rod a3 is also fixedly disposed at the bottom of the centrifuge slider a2. The L-shaped rod a3 slides through the centrifuge box a1 and extends to the outside. A guide wheel a4 is rotatably disposed at the end of the L-shaped rod a3 away from the centrifuge box a1. An inclined plate a5 is also fixedly disposed on the inner wall of the inner cylinder 4914. The guide wheel a4 slides along the inclined surface of the inclined plate a5. An avoidance hole a6 is opened at the top of the centrifuge slider a2. A guide post a7 adapted to the structure of the avoidance hole a6 is also fixedly disposed at the top of the inner cavity of the centrifuge box a1. The avoidance hole a6 is slidably sleeved on the outer wall of the guide post a7. A tension spring a8 for pushing the centrifuge slider a2 to reset is slidably disposed on the outer wall of the guide post a7 and located between the centrifuge slider a2 and the centrifuge box a1. The tension spring a8 is always in a compressed state, ensuring that when the centrifugal slider a2 is not subjected to centrifugal force, the clearance hole a6 is always located at one end of the centrifuge a1.

[0060] In this embodiment, the dust collection unit includes a dust collection cylinder 4918 fixedly disposed on the inner wall of the inner cylinder 4914. One end of the dust collection cylinder 4918 near the piston 4915 is threadedly connected to a conical guide cylinder 4919, and the other end is threadedly connected to a baffle 4920. Multiple exhaust channels are evenly provided on the inner wall of the inner cylinder 4914 near the dust collection cylinder 4918, for discharging the gas in the dust collection cylinder 4918 into the gap between the inner cylinder 4914 and the outer cylinder 491 through the exhaust channels.

[0061] This invention also provides a method for polishing the main water pipe used in heat exchanger processing, the method comprising the following steps:

[0062] Step 1, Loading and Positioning: Place the main water pipe of the heat exchanger to be polished in the lifting position of the lower limit component 2. Rotate the adjusting part of the lower limit component 2 to make the lower limit component 2 adapt to the diameter of the main water pipe to complete the initial lifting. Then, operate the upper limit component 3 to press and limit the main water pipe from above. Together with the lower limit component 2, the main water pipe is coaxially fixed, ensuring the rotational stability of the main water pipe during polishing. The slide rail 6 provides guidance for the movement of the lower limit component 2 throughout the process.

[0063] The specific process is as follows: The main water pipe of the heat exchanger to be polished is hoisted and placed between the first lifting roller 26 and the second lifting roller 27 of the water pipe lower limit assembly 2 on the top right side of the processing table 1. The handwheel at the end of the bidirectional screw 21 of the water pipe lower limit assembly 2 is rotated. Utilizing the threaded engagement between the bidirectional screw 21 and the first threaded sleeve 22 and the second threaded sleeve 23, the first threaded sleeve 22 and the second threaded sleeve 23 are driven to move synchronously closer or further apart along the bidirectional screw 21. This drives the long rotating shaft 24 and the sliding sleeve 25 connected to them to move synchronously, so that the first lifting roller 26 and the second lifting roller 27 adapt to the pipe diameter of the heat exchanger main water pipe to complete the initial lifting. During this process, the water pipe lower limit assembly 2 moves along the processing table 1. The top slide rail 6 slides, providing stable movement guidance; then, the control box 5 issues a command to control the water pipe upper limit assembly 3 on the side wall of the processing table 1 to move. The output shaft of the first cylinder 32 at the top of the L-shaped bracket 31 of the water pipe upper limit assembly 3 extends downward, pushing the wheel frame 33 to move down, so that the first roller 34 and the second roller 35, which are symmetrically rotated inside the wheel frame 33, complete the pressing and limiting from above the main water pipe of the heat exchanger. The first roller 34 and the second roller 35 cooperate with the first lifting roller 26 and the second lifting roller 27 of the water pipe lower limit assembly 2 to achieve coaxial fixation of the main water pipe of the heat exchanger on the processing table 1, ensuring the rotational stability of the main water pipe during subsequent grinding.

[0064] Step 2, Grinding preparation: Start all electrical equipment through control box 5, control the grinding mechanism 4 to move along the processing direction to the grinding inlet of the main water pipe, adjust the contact position between the grinding end of the grinding mechanism 4 and the inner wall of the main water pipe, and at the same time turn on the dust suction and heat dissipation cooling function of the grinding mechanism 4, and set all parameters before grinding.

[0065] The specific process is as follows: all electrical equipment of the starting device is activated through the control box 5 on the top left of the processing table 1, and an action command is sent to the grinding mechanism 4. The output shaft of the second cylinder 43 of the grinding mechanism 4 extends and pushes the sliding seat 42 to move horizontally along the cross-shaped slide rail 41 fixed on the front and rear sides of the top of the processing table 1, so that the grinding mechanism 4 moves as a whole to the grinding inlet of the main water pipe of the heat exchanger; the speed parameters of the servo motor 44 of the grinding mechanism 4 are adjusted, and the output shaft of the servo motor 44 drives the upper pulley 45 to rotate. The upper pulley 45 drives the lower pulley 46 to rotate synchronously through the toothed belt 47, which in turn drives the transmission shaft 48 connected to the lower pulley 46 to rotate. The transmission shaft 48 drives the grinding mechanism 49 at the end to adjust to a contact angle that matches the inner wall of the main water pipe, so that the grinding block 494 of the grinding mechanism 49 is precisely connected to the inner wall of the main water pipe.

[0066] Step 3, Rotary Grinding: The lower limit component 2 of the water pipe is controlled by the control box 5 to drive the main water pipe to rotate at a constant speed around its own axis. At the same time, the grinding mechanism 4 is controlled to perform grinding operations on the inner wall of the main water pipe. During the grinding process, the grinding mechanism 4 automatically sucks up the grinding dust and continuously dissipates heat and cools the parts in contact with the inner wall of the main water pipe to avoid thermal deformation of the main water pipe caused by local high temperature.

[0067] The specific process is as follows: A linkage command is issued through the control box 5, firstly controlling the start of the drive motor of the lower limit assembly 2 of the water pipe. The drive motor slides along the slide groove of the processing table 1 via a sliding seat. Its output shaft drives the long rotating shaft 24 to rotate via a coupling, thereby driving the first lifting roller 26 and the second lifting roller 27 to rotate, driving the main water pipe of the heat exchanger to rotate uniformly around its own axis. Simultaneously, the servo motor 44 of the grinding mechanism 4 is controlled to cycle between the first and second speeds according to a set program. The servo motor 44 drives the transmission shaft 48 to rotate via the upper pulley 45, the toothed belt 47, and the lower pulley 46, driving the grinding mechanism to rotate. The grinding mechanism 49 performs continuous grinding operations on the inner wall of the rotating heat exchanger main water pipe. During the grinding process, the dust collection holes 492 on the outer wall of the outer cylinder 491 of the grinding mechanism 49 collect the dust generated during grinding in real time. The dust first enters the dust collection pipe 4922, which corresponds to the dust collection holes 492. Because the third one-way valve 4923 only allows gas and dust to enter the inner cylinder 4914 in one direction, the dust and airflow enter the inner cylinder 4914 together through the dust duct 4921. At the same time, the grinding mechanism 49 rotates at high speed with the drive shaft 48, driving the centrifugal assembly 4917 inside the inner cylinder 4914 to rotate synchronously at high speed. Centrifuge a1 of component 4917 undergoes high-speed circular motion with the inner cylinder 4914. The centrifugal slider a2 inside the centrifuge a1 slides outward along the inner wall of centrifuge a1 under centrifugal force. During this sliding process, the L-shaped rod a3 at the bottom of the centrifugal slider a2 moves outward synchronously, causing the guide wheel a4 at the end of the L-shaped rod a3 to roll along the inclined plane a5 fixed to the inner wall of the inner cylinder 4914. The inclined plane a5 guides the centrifugal slider a2, converting the radial centrifugal force into an axial thrust that pushes the piston 4915, causing the piston 4915 to slide along the inner wall of the inner cylinder 4914 towards the annular heat dissipation pipe 496. During this process, the centrifugal slider a2... The clearance hole a6 at the top slides along the guide post a7 at the top of the inner cavity of the centrifuge a1. The guide post a7 provides a stable sliding guide for the centrifugal slider a2. At the same time, the tension spring a8 on the outer wall of the guide post a7 is compressed by the centrifugal slider a2, continuously forming an elastic restoring force. The piston 4915 slides under the action of axial thrust and compresses the restoring spring 4916, so that the space between the piston 4915 and the dust capture unit in the inner cylinder 4914 forms a negative pressure suction force. This negative pressure suction force continuously draws the dust-laden airflow inward through the dust duct 4921, the dust collection pipe 4922, and the dust suction hole 492, realizing continuous and efficient dust suction.When the servo motor 44 switches from the second speed to the first speed, because the centrifugal force is less than the tension spring a8 at the first speed, the centrifugal slider a2 cannot overcome the tension spring a8 and slide away from the axis of the piston 4915. The piston 4915 moves in the opposite direction under the action of the return spring 4916. The dust sucked into the inner cylinder 4914 is pushed to the conical guide tube 4919 by the piston 4915. After being guided by the conical guide tube 4919, it is concentrated into the dust collection tube 4918 for collection. The baffle 4920 effectively prevents the dust in the dust collection tube 4918 from flowing back to other areas of the inner cylinder 4914, further ensuring the dust suction effect. After the operation is completed, the end cap at one end of the outer cylinder 491 can be opened and the baffle 4920 can be unscrewed to clean the dust in the dust collection tube 4918. At the same time, the heat dissipation and cooling system of the grinding mechanism 49 operates synchronously, and the heat conduction plate 49 13 is in close contact with the grinding block 494 in the grinding block mounting groove 493, continuously dissipating the grinding heat from the contact area between the grinding block 494 and the inner wall of the main water pipe. The heat conduction plate 4913 conducts the heat from the grinding block 494 to the heat conduction rod 4912, and the heat conduction rod 4912 further exchanges heat with the heat conduction oil in the heat conduction oil pipe 497 to reduce the heat of the heat conduction rod 4912 and the heat conduction plate 4913. The heat conduction oil expands after being heated and flows back to the annular heat dissipation pipe 496 through the long conduit 4910 and the second one-way valve 4911. The heat conduction oil in the annular heat dissipation pipe 496 flows into the heat conduction oil pipe 497 through the short conduit 498 and the first one-way valve 499, forming an annular flow of heat conduction oil circulation, realizing continuous heat dissipation and cooling of this part, effectively avoiding uneven thermal expansion and contraction caused by local high temperature, preventing thermal deformation of the main water pipe of the heat exchanger, until the overall grinding operation of the inner wall of the main water pipe of the heat exchanger is completed. ;

[0068] Step 4, Unloading and Finishing: After the main water pipe is polished, the grinding mechanism 4 is turned off by the control box 5, and the grinding, dust suction and heat dissipation functions are turned off. Then the upper limit component 3 of the water pipe is reset to release the upper limit. After that, the lower limit component 2 of the water pipe is adjusted to release the lifting limit of the main water pipe. The polished main water pipe is removed. Finally, all electrical equipment is turned off by the control box 5 to complete the polishing operation.

[0069] The specific process is as follows: After the grinding operation of the inner wall of the main water pipe of the heat exchanger is completed, a stop command is issued through the control box 5. First, the servo motor 44 of the grinding mechanism 4 is turned off, and the grinding operation of the grinding mechanism 49 is stopped. After the grinding mechanism 49 stops rotating, the centrifugal force of the centrifugal component 4917 disappears, the tension spring a8 on the outer wall of the guide column a7 releases its elastic restoring force, pushes the centrifugal slider a2 to reset along the inner wall of the centrifugal box a1, the guide wheel a4 rolls back along the inclined plane a5, the axial thrust disappears, and at the same time, the elastic restoring force of the reset spring 4916 pushes the piston 4915 to reset along the inner wall of the inner cylinder 4914, and the dust suction function stops synchronously; then the operation The output shaft of the first cylinder 32 of the upper limit assembly 3 of the water pipe retracts, driving the wheel frame 33, the first roller 34, and the second roller 35 to move upward and reset, releasing the upper limit on the main water pipe of the heat exchanger; then, the handwheel at the end of the bidirectional screw 21 of the lower limit assembly 2 of the water pipe is rotated, driving the first threaded sleeve 22 and the second threaded sleeve 23 to move away from each other, driving the first lifting roller 26 and the second lifting roller 27 to separate, releasing the lifting limit on the main water pipe of the heat exchanger; the polished main water pipe of the heat exchanger is removed from the processing table 1 by the hoisting equipment, and finally all electrical equipment of the device is turned off by the control box 5, completing the polishing operation of the main water pipe of the heat exchanger.

[0070] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0071] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A grinding device for main water pipes in heat exchanger processing, comprising a processing table, characterized in that, Also includes: The water pipe lower limit assembly is located on the right side of the top of the processing table. It is used to support the main water pipe of the heat exchanger to be polished and drive it to rotate during the polishing process. Two slide rails are also fixedly installed on the top right side of the processing table to provide movement guidance for the water pipe lower limit assembly. Multiple upper limit components for water pipes are evenly arranged on one side of the lower limit component for water pipes. They are used to cooperate with the lower limit component to limit the main water pipe of the heat exchanger from above, so as to ensure the rotational stability of the main water pipe of the heat exchanger. The grinding mechanism is located on the left side of the top of the processing table. It is used to grind the inner wall of the main water pipe of the heat exchanger and automatically suck up the grinding dust during the grinding process. At the same time, it continuously dissipates heat and cools the part in contact with the inner wall of the main water pipe of the heat exchanger to avoid uneven thermal expansion and contraction caused by local high temperature, which could lead to thermal deformation of the main water pipe of the heat exchanger. The grinding mechanism includes a grinding mechanism and a drive shaft. The control box is fixedly installed on the top left side of the processing table and is used to control the operation of all electrical equipment. The grinding mechanism includes an outer cylinder that is detachably mounted on one end of the drive shaft by bolts. Multiple sets of dust collection channels are evenly opened on the outer wall of the outer cylinder. Each set of dust collection channels is composed of multiple dust suction holes arranged at equal intervals. Multiple grinding block mounting slots are also evenly opened on the outer wall of the outer cylinder along the circumference. A grinding block is detachably mounted inside the grinding block mounting slot by bolts. The side of the grinding block away from the grinding block mounting slot is designed as an arc surface and protrudes from the grinding block mounting slot, so as to contact the inner wall of the main water pipe of the heat exchanger. Multiple heat conduction plate mounting slots are also evenly opened at the bottom of the grinding block mounting slot. An annular heat dissipation pipe is fixedly installed at one end of the outer cylinder near the drive shaft. Multiple heat exchange units connected to the annular heat dissipation pipe are evenly arranged on one side of the pipe. Each heat exchange unit includes a heat-conducting oil pipe fixedly installed on the inner wall of the outer cylinder. A short conduit for inputting internal heat-conducting oil into the annular heat dissipation pipe is fixedly installed on one side of the heat-conducting oil pipe. A first one-way valve allowing only heat-conducting oil to flow out of the short conduit is fixedly installed inside the short conduit. A long conduit for inputting heat-conducting oil from the annular heat dissipation pipe into the heat-conducting oil pipe is also fixedly installed on one side of the heat-conducting oil pipe. A second one-way valve allowing only heat-conducting oil to flow into the heat-conducting oil pipe is fixedly installed inside the long conduit. Multiple heat-conducting rods are evenly fixedly installed inside the heat-conducting oil pipe. One end of each heat-conducting rod penetrates the heat-conducting oil pipe and the outer wall of the outer cylinder and is fixedly fitted with a heat-conducting plate. The heat-conducting plate is fixedly installed in a heat-conducting plate mounting groove. The other ends of both the short and long conduits are connected to the annular heat dissipation pipe.

2. The main water pipe grinding device for heat exchanger processing according to claim 1, characterized in that: The lower limit assembly of the water pipe includes a bidirectional lead screw rotatably mounted on the top of the processing table via a mounting bracket. A first threaded sleeve and a second threaded sleeve are symmetrically arranged on both sides of the outer wall of the bidirectional lead screw. The first threaded sleeve and the second threaded sleeve form a threaded engagement with the outer wall of the bidirectional lead screw. Under the drive of the bidirectional lead screw, the first threaded sleeve and the second threaded sleeve can synchronously move closer or further away from each other. A long rotating shaft rotatably passes through the interior of each of the first threaded sleeve and the second threaded sleeve. Sliding sleeves are rotatably arranged at both ends of the long rotating shaft. A first lifting roller and a second lifting roller are respectively fixedly sleeved on the outer wall of the long rotating shaft and located on both sides of the bidirectional lead screw. A drive motor is also slidably arranged on one side of the top of the processing table. The output shaft of the drive motor is connected to the end of one of the long rotating shafts through a coupling.

3. The main water pipe grinding device for heat exchanger processing according to claim 1, characterized in that: The water pipe upper limit assembly includes an L-shaped bracket fixedly mounted on the side wall of the processing table. A first cylinder is fixedly mounted on the top of the L-shaped bracket. The output shaft of the first cylinder slides through the L-shaped bracket and is fixedly mounted on a wheel frame. A first roller and a second roller are symmetrically rotated on both sides inside the wheel frame.

4. The main water pipe grinding device for heat exchanger processing according to claim 1, characterized in that: The grinding mechanism includes two cross-shaped slide rails fixedly mounted on the front and rear sides of the top of the processing table. A sliding seat is slidably fitted on the outer wall of the two cross-shaped slide rails. A second cylinder is also fixedly mounted on one side of the top of the processing table. The output shaft of the second cylinder is fixedly connected to the sliding seat and is used to push the sliding seat to move along the outer wall of the cross-shaped slide rail. A servo motor is fixedly mounted on the side wall of the sliding seat near the side wall of the second cylinder. The output shaft of the servo motor rotates through the sliding seat and is fixedly mounted on an upper pulley. A lower pulley is rotatably mounted on the side wall of the sliding seat and below the upper pulley. A toothed belt is fitted on the outer wall of the upper and lower pulleys. A drive shaft is fixedly mounted on one end of the lower pulley. A grinding mechanism for grinding the main water pipe of the heat exchanger is mounted on the end of the drive shaft away from the sliding seat. The servo motor cycles between a set first speed and a second speed. The first speed is less than the second speed, and the switching interval between the first speed and the second speed is five minutes.

5. The main water pipe grinding device for heat exchanger processing according to claim 1, characterized in that: An inner cylinder is coaxially fixed inside the outer cylinder. A piston is slidably and sealed inside the inner cylinder. A return spring is fixed between the piston and the inner wall of the inner cylinder. A guide block is also fixed on the outer wall of the piston. A guide groove adapted to the structure of the guide block is formed on the inner wall of the inner cylinder. A sliding fit is formed between the guide block and the guide groove. Two centrifugal components are symmetrically arranged at the upper and lower positions of the piston away from the return spring. They are used to push the piston towards the annular heat dissipation pipe using centrifugal force. A dust capture unit for collecting grinding dust is also provided on the side of the inner cylinder near the centrifugal components. Multiple dust conduits connected to the interior are uniformly fixed on the outer wall of the inner cylinder. A dust collection pipe is fixedly installed at the end of the dust conduit away from the inner cylinder. A third one-way valve that only allows gas to enter the inner cylinder is fixedly installed inside the dust collection pipe. The dust collection pipe is fixedly installed on the inner wall of the outer cylinder.

6. The main water pipe grinding device for heat exchanger processing according to claim 5, characterized in that: The centrifuge assembly includes a centrifuge chamber fixedly mounted at the piston end. A centrifuge slider is slidably mounted inside the centrifuge chamber. An L-shaped rod is fixedly mounted at the bottom of the centrifuge slider, which slides through the centrifuge chamber and extends to the outside. A guide wheel is rotatably mounted at the end of the L-shaped rod away from the centrifuge chamber. An inclined plate is fixedly mounted on the inner wall of the inner cylinder, and the guide wheel slides along the inclined surface of the inclined plate. An clearance hole is provided at the top of the centrifuge slider. A guide post adapted to the structure of the clearance hole is fixedly mounted at the top of the inner cavity of the centrifuge chamber. The clearance hole is slidably sleeved on the outer wall of the guide post. A tension spring for pushing the centrifuge slider to reset is slidably mounted on the outer wall of the guide post between the centrifuge slider and the centrifuge chamber.

7. A main water pipe grinding device for heat exchanger processing according to claim 5, characterized in that: The dust capture unit includes a dust collection cylinder fixedly installed on the inner wall of the inner cylinder. One end of the dust collection cylinder near the piston is threadedly connected to a conical guide cylinder, and the other end is threadedly connected to a baffle. Multiple exhaust channels are evenly opened on the inner wall of the inner cylinder near the dust collection cylinder, which are used to discharge the gas in the dust collection cylinder into the gap between the inner cylinder and the outer cylinder through the exhaust channels.

8. A method for grinding the main water pipe for heat exchanger processing, used in the grinding apparatus for the main water pipe for heat exchanger processing as described in any one of claims 1-7, characterized in that: The method includes the following steps: Step 1: Place the main water pipe of the heat exchanger to be polished in the lifting position of the lower limit component of the water pipe. Rotate the adjusting part of the lower limit component of the water pipe to make the lower limit component of the water pipe adapt to the diameter of the main water pipe and complete the initial lifting. Then, operate the upper limit component of the water pipe to make the upper limit component of the water pipe press and limit from above the main water pipe. Together with the lower limit component of the water pipe, the main water pipe is coaxially fixed, ensuring the rotational stability of the main water pipe during the polishing process. The movement of the lower limit component of the water pipe is guided by the slide rail throughout the process. Step 2: Start all electrical equipment through the control box, control the grinding mechanism to move along the processing direction to the grinding inlet of the main water pipe, adjust the contact position between the grinding end of the grinding mechanism and the inner wall of the main water pipe, and at the same time turn on the dust suction and heat dissipation cooling functions of the grinding mechanism, and set all parameters before grinding. Step 3: Control the lower limit component of the water pipe through the control box to drive the main water pipe to rotate at a constant speed around its own axis. At the same time, control the grinding mechanism to perform grinding operations on the inner wall of the main water pipe. During the grinding process, the grinding mechanism automatically sucks up the grinding dust and continuously dissipates heat and cools the parts in contact with the inner wall of the main water pipe to avoid thermal deformation of the main water pipe caused by local high temperature. Step 4: After the main water pipe is polished, first turn off the polishing, dust extraction and heat dissipation functions of the polishing mechanism through the control box, then control the upper limit component of the water pipe to reset and release the upper limit, then adjust the lower limit component of the water pipe to release the lifting limit of the main water pipe, remove the polished main water pipe, and finally turn off all electrical equipment through the control box to complete this polishing operation.

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