A large-diameter heat pipe opening device

Abstract

The application discloses a large-diameter heat pipe opening device, and relates to the technical field of heat pipe opening, which comprises a tee joint welded to the outer wall of a mother pipe, a full-bore gate valve installed at the upper end of the tee joint, an opening mechanism installed on the full-bore gate valve, and a sealing cavity formed by the full-bore gate valve and the tee joint. The opening mechanism comprises a base fixedly installed on the full-bore gate valve and a guide assembly movably installed on the base, and the guide assembly is provided with an opening assembly, a damping shock-absorbing mechanism and a cooling mechanism. The device has the advantages that the damping shock-absorbing mechanism can absorb vibration, the guide assembly can enhance the opening stability, and the cooling mechanism can forcibly cool, thereby preventing fatigue cracks or sealing failure of the weld caused by resonance, significantly improving the safety of the opening operation under pressure, preventing the cutter from producing deflection due to uneven stress, ensuring the concentricity and the quality of the cutting process, and efficiently absorbing cutting heat.

Description

Technical Field

[0001] This invention relates to the field of thermal pipeline perforation technology, and in particular to a large-diameter thermal pipeline perforation device. Background Technology

[0002] In the fields of centralized heating and petrochemical pipeline transportation, it is often necessary to perform tapping operations on large-diameter thermal pipelines to connect branch pipelines without interrupting operation or releasing pressure. Currently, mechanical cutting type pressurized tapping device is one of the most widely used technical solutions. It typically includes a tee welded to the main pipe, a full-bore gate valve, and a tapping mechanism installed on the gate valve. The tapping mechanism drives the cutter and center drill to rotate and feed, completing the cutting of the pipe wall.

[0003] During cutting, although the movement trajectory of the cutter is a planar circle, the pipe wall it cuts is a curved surface. Two or four symmetrical cutting teeth of the cutter contact the pipe wall, generating severe point-like impact loads. These impact loads induce high-frequency vibrations throughout the opening device, which are transmitted along the opening mechanism, gate valve, and tee to the weld joint between the main pipe and the tee. Prolonged or high-frequency vibrations can easily lead to fatigue cracks in the weld joint, and in severe cases, may cause media leakage, posing a significant safety hazard.

[0004] Secondly, the cutter of the hole-opening mechanism usually has a long cantilever structure. During the cutting process, due to the uneven force caused by the curved surface of the pipe wall, the cutter is prone to radial runout. Runout not only reduces the concentricity of the cutting process, resulting in irregular cuts and dimensional deviations, but may also cause the tool to jam or break teeth, affecting the success rate and quality of the hole-opening operation.

[0005] Furthermore, the medium transported inside large-diameter thermal pipelines is usually high-temperature hot water. When the cutting tool cuts the pipe wall, the intense friction between the cutting teeth and the metal also generates a large amount of heat. If the cutting heat cannot be dissipated in time, it will cause the cutting tooth material to soften at high temperatures, accelerate wear, and even cause sticking or cold welding, seriously affecting the tool life and the surface quality of the cut.

[0006] Therefore, in order to improve the safety and processing accuracy of the hole-opening operation, the present invention provides a hole-opening device for large-diameter thermal pipelines. Summary of the Invention

[0007] The purpose of this invention is to solve the problems existing in the prior art and to propose a large-diameter thermal pipeline opening device.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: a large-diameter thermal pipeline opening device, comprising: a tee, welded to the outer wall of the main pipe, with its left and right sides covering the main pipe, and its upper end aligned with the position to be opened.

[0009] A full-bore gate valve, installed at the upper end of a tee.

[0010] An opening mechanism is installed on a full-bore gate valve and, together with the full-bore gate valve and the tee, forms a sealed cavity isolated from the outside. The opening mechanism includes a base fixedly installed on the full-bore gate valve and a guide assembly movably installed on the base. The guide assembly is equipped with an opening component, a damping and shock absorption mechanism, and a cooling mechanism.

[0011] The perforation assembly includes a synchronously rotating and axially fed cutter and a center drill. The center drill first penetrates the pipe wall for positioning and guidance, and then the cutter performs a circumferential cut on the pipe wall. The guiding assembly provides stable axial guidance for the perforation assembly. The damping and vibration reduction mechanism adapts to the pipe wall curvature before the cutter cuts, conforms to the pipe surface, absorbs and dissipates vibration energy during the cutter cutting process, and isolates high-frequency vibrations from being transmitted to the welding interface between the tee and the main pipe. The cooling mechanism accurately supplies cooling medium to the cutting contact area between the cutter and the pipe wall for forced cooling.

[0012] In the above-mentioned large-diameter thermal pipeline opening device, the guiding component includes a guide seat that slides up and down along the inner wall of the base, and a guide hole is coaxially opened in the middle of the guide seat.

[0013] In the above-mentioned large-diameter thermal pipeline opening device, a coaxial connecting seat is rotatably connected inside the guide hole, and a mating hole with a cross-shaped cross section is opened in the middle of the connecting seat.

[0014] In the above-mentioned large-diameter thermal pipeline opening device, the guide seat is composed of a first circular seat and a second circular seat arranged coaxially.

[0015] In the above-mentioned large-diameter thermal pipeline opening device, the opening assembly also includes a pull rod movably disposed in the guide hole. The side wall of the pull rod is fixedly provided with a horizontal cross-shaped spline, which slides in conjunction with the mating hole of the connecting seat.

[0016] In the above-mentioned large-diameter thermal pipeline opening device, a tube cutter and a center drill coaxially arranged with the tube cutter are fixedly installed at the bottom end of the pull rod.

[0017] In the above-mentioned large-diameter thermal pipeline opening device, the damping and shock absorption mechanism includes multiple push rods that are elastically and slidably connected to the second circular seat of the guide seat along the axial direction. The multiple push rods are evenly distributed along the circumference. A locking block is fixedly installed at the top of each push rod, and a damping contact element is connected to its bottom end through a ball joint.

[0018] In the above-mentioned large-diameter thermal pipeline opening device, the damping and shock absorption mechanism also includes a locking assembly for locking the position of the damping contact element behind the adaptive outer wall curved surface of the main pipe; the locking assembly includes two annular slides that are circumferentially slidably disposed on the top wall of the second circular seat of the guide seat, and the two annular slides are coaxially arranged inside and outside each other.

[0019] In the above-mentioned large-diameter thermal pipeline opening device, the locking block is located between the inner annular slide and the outer annular slide. Multiple wedge-shaped locking blocks are fixedly installed on the side walls of the inner and outer annular slides that are close to each other, and the wedge-shaped locking blocks correspond to the locking block.

[0020] In the above-mentioned large-diameter thermal pipeline opening device, the cooling mechanism includes a cooling flow channel opened inside the push rod and the locking block. The lower side wall of the push rod is provided with a medium outlet facing the cutting area of ​​the barrel cutter. The top of the locking block is connected to a flexible bellows, which passes through the first circular seat of the guide seat and is connected to the external pumping unit and the cooling medium storage tank.

[0021] Compared with existing technologies, the advantages of this invention are: the invention absorbs vibration through a damping and shock absorption mechanism, enhances the stability of the opening through a guiding component, and forces cooling through a cooling mechanism, which significantly improves the safety and processing accuracy of pressurized opening operations.

[0022] 1. By setting up a damping and shock absorption mechanism, the top rod drives the damping contact element to pre-fit the curved surface of the pipe under the action of elastic pre-tightening force, adapts to the curvature of the pipe wall and locks in position. During the cutting process of the tube cutter, it effectively absorbs and dissipates the high-frequency vibration energy generated by the point impact load, isolates the transmission of vibration to the welding interface between the tee and the main pipe, prevents fatigue cracks or sealing failure of the weld due to resonance, and significantly improves the safety of hot tapping operations.

[0023] 2. The guide seat is composed of a first circular seat and a second circular seat arranged coaxially, which extends the guide length. The cross-shaped mating hole on the connecting seat slides with the spline on the tie rod, allowing the opening assembly to rotate freely while obtaining stable axial guidance. This structure effectively shortens the cantilever length during the cutting of the tube cutter, enhances the opening stability, prevents the tube cutter from wobbling due to uneven force, and ensures the concentricity and cut quality during the cutting process.

[0024] 3. The cooling mechanism precisely sprays the cooling medium into the cutting contact area between the cutter and the tube wall through the cooling channels inside the push rod and the locking block and the medium outlet located on the lower side wall of the push rod. It utilizes the latent heat of vaporization of the medium at high temperature in the cutting zone to efficiently absorb the cutting heat. Attached Figure Description

[0025] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, wherein:

[0026] Figure 1 This is a schematic diagram of the overall structure;

[0027] Figure 2 A schematic diagram of the cross-sectional structure of a three-way, full-bore gate valve and its base;

[0028] Figure 3 A partial structural exploded view of the opening mechanism;

[0029] Figure 4 A structural schematic diagram showing a partial cross-section of the opening mechanism;

[0030] Figure 5 for Figure 4 Right view of the structure;

[0031] Figure 6 A structural schematic diagram showing a partial cross-section of the opening mechanism from another perspective;

[0032] Figure 7 for Figure 6 Front view structural diagram;

[0033] Figure 8 This is a schematic diagram of the structure in which a wedge-shaped locking block on an annular slide restricts the locking block.

[0034] In the diagram: 1. Tee; 2. Full-bore gate valve; 3. Opening mechanism; 31. Base; 32. Guide assembly; 321. Guide seat; 322. Connecting seat; 33. Opening assembly; 331. Tie rod; 332. Spline; 333. Cylinder cutter; 334. Center drill; 34. Damping and vibration damping mechanism; 341. Top rod; 342. Locking block; 343. Damping contact element; 344. Annular slide; 345. Wedge-shaped locking block; 35. Cooling mechanism; 351. Cooling channel; 352. Medium outlet; 353. Flexible bellows. Detailed Implementation

[0035] 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.

[0036] Reference Figure 1A large-diameter thermal pipeline tapping device includes a tee 1, a full-bore gate valve 2, and a tapping mechanism 3. The tee 1 is welded to the outer wall of the main pipe, with its left and right sides covering the main pipe, and its upper end aligned with the position to be tapped on the main pipe. The full-bore gate valve 2 is installed on the upper end of the tee 1. The tapping mechanism 3 is installed on the full-bore gate valve 2, and together with the full-bore gate valve 2 and the tee 1, forms a sealed cavity isolated from the outside. This sealed cavity can withstand the pressure of the medium inside the main pipe, providing a safe space for subsequent pressurized tapping operations.

[0037] It should be noted that the welding quality between the tee 1 and the main pipe is fundamental to ensuring the safety of the sealed cavity. Before welding, the area of ​​the main pipe to be welded should be thoroughly derusted and dried. After welding, non-destructive testing (such as radiographic testing or ultrasonic testing) should be performed to confirm that there are no defects such as cracks or pores before proceeding with subsequent operations.

[0038] Reference Figures 1 to 4 The opening mechanism 3 includes a base 31 and a guide assembly 32 movably mounted on the base 31. The guide assembly 32 is provided with an opening assembly 33, a damping and shock absorption mechanism 34, and a cooling mechanism 35. The base 31 is fixedly mounted on the full-bore gate valve 2.

[0039] The guide assembly 32 provides stable axial guidance for the opening assembly 33. Specifically, the guide assembly 32 includes a guide seat 321 driven by a first linear drive unit (not shown in the figure, preferably a hydraulic cylinder) and sliding up and down along the inner wall of the base 31. A guide hole is coaxially formed in the center of the guide seat 321. A coaxial connecting seat 322 is rotatably connected within the guide hole. A mating hole with a cross-shaped cross section is formed in the center of the connecting seat 322.

[0040] Reference Figures 2 to 4 The hole-opening assembly 33 includes a cylindrical cutter 333 that rotates synchronously and feeds axially, and a center drill 334. During hole opening, the center drill 334 first drills through the pipe wall to achieve positioning and guidance, and then the cylindrical cutter 333 performs a circumferential cut on the pipe wall. Specifically, the hole-opening assembly 33 also includes a pull rod 331 disposed in the guide hole. The top end of the pull rod 331 is connected to a rotary drive unit and a second linear drive unit (both not shown in the figure; the rotary drive unit is preferably a servo motor, and the second linear drive unit is preferably a hydraulic cylinder). A horizontal spline 332 with a cross-shaped horizontal cross section is fixedly disposed on the side wall of the pull rod 331. The spline 332 slides in contact with the mating hole of the connecting seat 322, so that the hole-opening assembly 33 can slide up and down relative to the guide assembly 32 and rotate freely. The bottom end of the pull rod 331 is fixedly mounted with the cylindrical cutter 333 and the center drill 334 coaxially disposed with the cylindrical cutter 333.

[0041] Preferably, the guide seat 321 is composed of a first circular seat and a second circular seat arranged coaxially. This structure extends the guide length, prevents radial wobble, tool jamming or tooth breakage during the cutting of the tube cutter 333, improves the concentricity of the cutting process, and thus improves the success rate and quality of the hole opening operation.

[0042] Preferably, the cutting outer diameter of the cylindrical cutter 333 is smaller than the outer diameter of the second circular seat of the guide seat 321, and the outer diameter of the second circular seat of the guide seat 321 is smaller than the nominal diameter of the full-bore gate valve 2. This design ensures that the tool assembly can safely pass through the gate valve without contact. The end of the center drill 334 is provided with a mechanical locking structure (not shown in the figure, and is existing mature technology, so it will not be described in detail here) to lock and remove the cut saddle-shaped material block after cutting. This locking structure can be in the form of a reverse thread, a stepped boss, or a flexible chuck, ensuring that the material block will not fall into the pipe during the tool retraction process.

[0043] It should be noted that the coaxiality between the guide hole and the pull rod 331 should be controlled within 0.05mm, and the coaxiality between the core cutter 333 and the center drill 334 should be controlled within 0.03mm. The extension length of the center drill 334 should ensure that it penetrates the pipe wall before the core cutter 333 contacts the pipe wall; it is usually designed to extend 3mm to 5mm beyond the cutting edge of the core cutter 333. The tool material should be high-speed steel or cemented carbide with good high-temperature red hardness, and the wear of the cutting teeth should be checked regularly.

[0044] Reference Figures 2 to 8 The damping and shock absorption mechanism 34 is used to adapt the pipe wall curvature to fit the pipe surface before the tube cutter 333 cuts, and absorb and dissipate vibration energy during the tube cutter 333 cutting process, and isolate the transmission of high frequency vibration to the welding interface between the tee 1 and the main pipe.

[0045] Specifically, the damping and shock absorption mechanism 34 includes multiple push rods 341 that are axially elastically slidably connected to the guide seat 321, and the multiple push rods 341 are evenly distributed circumferentially. Each push rod 341 has a locking block 342 fixedly mounted at its top end, and its bottom end is connected to a damping contact element 343 via a ball joint. In the initial elastic state, the push rods 341 make the lower surfaces of the multiple damping contact elements 343 coplanar. Before the drilling operation, the damping contact elements 343 move downwards with the guide assembly 32, gradually conforming to and adapting to the curvature of the outer wall of the main tube, producing corresponding tilting and displacement.

[0046] The damping and shock absorption mechanism 34 also includes a locking assembly for locking the position of the damping contact element 343 behind the curved surface of the adaptive mother tube. The locking assembly includes two annular slides 344 that slide circumferentially (driven by an electric slider) on the top wall of the second circular seat of the guide seat 321, with the two annular slides 344 coaxially arranged inside and outside each other. A locking block 342 is located between the inner and outer annular slides 344, and multiple wedge-shaped locking blocks 345 are fixedly arranged on the opposite sidewalls of the inner and outer annular slides 344. When the inner and outer annular slides 344 slide circumferentially in opposite directions, the inner wedge-shaped locking block 345 and the corresponding outer wedge-shaped locking block 345 approach each other and clamp the locking block 342, thereby achieving position restriction.

[0047] It should be noted that the elastic element of the connecting rod 341 is a spring (not shown in the figure), and the elastic preload should be calibrated according to the wall thickness and material of the mother tube. The opposing clamping surfaces of the wedge-shaped locking blocks 345 are made of a high-friction coefficient material, such as polyurethane, to enhance the reliability of the restraint.

[0048] Reference Figures 2 to 8 The cooling mechanism 35 is used to accurately supply cooling medium to the cutting contact area between the cutter 333 and the pipe wall for forced cooling. Specifically, the cooling mechanism 35 includes a cooling channel 351 formed inside the push rod 341 and the locking block 342. The lower side wall of the push rod 341 has a medium outlet 352 facing the cutting area of ​​the cutter 333. A flexible bellows 353 is connected to the top of the locking block 342. The flexible bellows 353 passes through the first circular seat of the guide seat 321 and is connected to the external pumping unit and the cooling medium storage tank (not shown in the figure). During operation, the pumping unit delivers the cooling medium sequentially through the flexible bellows 353 and the cooling channel 351 to the medium outlet 352, and precisely sprays it onto the cutting contact area between the cutter 333 and the pipe wall to achieve forced cooling.

[0049] It should be noted that the flexible bellows 353 should be made of high-temperature resistant and corrosion-resistant stainless steel. The number and distribution angle of the media outlets 352 should ensure that the spray range covers the entire circumferential cutting area of ​​the cutter 333. It is recommended to have no less than 6 outlets evenly distributed around the circumference, with the spray direction forming an angle of 15° to 30° with the axis of the cutter 333.

[0050] Preferably, for pipelines conveying hot water at temperatures of 100°C to 150°C, the cooling medium is a water-based emulsion containing extreme pressure additives at approximately 20°C to 30°C. This medium can boil and vaporize at high temperatures in the cutting zone, efficiently absorbing cutting heat using its latent heat of vaporization. Simultaneously, the extreme pressure additives form a lubricating film under high temperature and pressure, effectively reducing cutting friction and preventing tool sticking. Furthermore, the extreme pressure additives should be environmentally friendly formulations that are chlorine-free, sulfur-free, and phosphorus-free (such as modified vegetable oil-based extreme pressure additives).

[0051] It should be noted that, for the absolute safety of the piping system, the cooling medium can also be pure water, deionized water, or an aqueous solution containing only rust inhibitor. Although this method reduces lubrication performance, it completely avoids any adverse effects of chemical additives on the inner wall of the pipe and the heating medium, making it particularly suitable for heating networks with extremely high water quality requirements or stringent safety requirements. During operation, insufficient lubrication can be compensated for by appropriately reducing the feed rate or using sharper tool geometry.

[0052] When the large-diameter thermal pipeline opening device of the present invention is in operation, it shall be carried out according to the following steps: First, the tee 1 is welded to the outer wall of the main pipe, and the full-bore gate valve 2 and the opening mechanism 3 are installed in sequence to form a sealed cavity and perform an airtightness test. The airtightness test pressure shall not be less than 1.1 times the design pressure of the main pipe, and the pressure holding time shall not be less than 15 minutes. Subsequent operations can only be carried out if there is no pressure drop.

[0053] Next, the full-bore gate valve 2 opens, activating the first linear drive unit. This drives the guide assembly 32 to move downwards, causing the damping contact element 343 of the damping and shock-absorbing mechanism 34 to contact the outer wall of the main pipe. Under the elastic action of the push rod 341, the damping contact element 343 adapts to the height of the pipe wall curvature and rotates around the bottom of the push rod 341 to adapt to the curvature of the pipe wall. The locking block 342 then moves downwards to different heights, and then drives the locking assembly (the inner and outer annular slides 344 slide in opposite directions), causing the wedge-shaped locking block 345 to clamp the locking block 342, limiting the adaptive position. At this time, the center drill 334 has not yet contacted the pipe wall.

[0054] Next, the rotary drive unit and the second linear drive unit are activated to drive the pull rod 331 of the hole-opening assembly 33 to rotate and feed downward. The center drill 334 first contacts the pipe wall and drills through, establishing a positioning guide hole; the tube cutter 333 then contacts the pipe wall and performs annular cutting.

[0055] During the cutting process, the damping and shock absorption mechanism 34 absorbs impact vibrations, and the cooling mechanism 35 continuously sprays cooling medium into the cutting area for forced cooling. It should be noted that the cooling medium should be sprayed before the center drill 334 begins cutting, and should continue to spray for 5 to 10 seconds after the tool retraction is completed, in order to fully cool the tool.

[0056] Finally, after the cutter 333 completely cuts through the pipe wall (manifested as a sudden disappearance of cutting resistance and a drop in the drive unit current to its no-load value), stop the feed, reverse the rotation, and lift the pull rod 331. The locking structure at the end of the center drill 334 will bring out the cut saddle-shaped material block. Close the full-bore gate valve 2, disassemble the opening mechanism 3, and complete the pressurized opening operation. It should be noted that before retracting the cutter, it should be confirmed that the center drill 334 has reliably locked the saddle-shaped material block. The retraction speed should be uniform and slow to avoid impact that could cause the material block to fall off. If the material block falls into the pipeline, the operation should be stopped immediately, an endoscope should be used to determine the location of the material block, and a magnetic retrieval device should be used to remove it.

[0057] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0058] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0059] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0060] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A device for opening holes in large-diameter thermal pipelines, characterized in that, include: The tee is welded to the outer wall of the main pipe, with its left and right sides covering the main pipe and its upper end aligned with the position to be opened. A full-bore gate valve, installed at the upper end of a tee; The opening mechanism is installed on the full-bore gate valve and together with the full-bore gate valve and the tee, forms a sealed cavity that is isolated from the outside world; The opening mechanism includes a base fixedly installed on the full-bore gate valve and a guide assembly movably installed on the base. The guide assembly is provided with an opening assembly, a damping and shock absorption mechanism and a cooling mechanism. The opening assembly includes a cylindrical cutter and a center drill that rotate synchronously and feed axially. The center drill first drills through the pipe wall for positioning and guidance, and then the cylindrical cutter performs a circumferential cut on the pipe wall. The guide assembly is used to provide stable axial guidance for the opening assembly. The guide assembly includes a guide seat that slides up and down along the inner wall of the base. The guide seat is driven by a first linear drive unit. The guide seat is composed of a first circular seat and a second circular seat arranged coaxially. A guide hole is coaxially opened in the middle of the guide seat. A connecting seat coaxially connected is rotatably connected in the guide hole. A mating hole with a cross-shaped cross section is opened in the middle of the connecting seat. The opening assembly also includes a pull rod movably disposed in the guide hole. The top end of the pull rod is connected to a rotary drive unit and a second linear drive unit. The bottom end of the pull rod is fixedly installed with a tube cutter and a center drill coaxially disposed with the tube cutter. A horizontal cross-shaped spline is fixedly disposed on the side wall of the pull rod. The spline is slidably engaged with the mating hole of the connecting seat. The damping and vibration reduction mechanism is used to adapt to the curvature of the pipe wall and fit the curved surface of the pipe before the tube cutter cuts, absorb and dissipate vibration energy during the tube cutter cutting process, and isolate the transmission of high-frequency vibration to the welding interface between the tee and the main pipe; the damping and vibration reduction mechanism includes multiple push rods that are elastically slidably connected to the second circular seat of the guide seat along the axial direction. The multiple push rods are evenly distributed along the circumference, and a locking block is fixedly installed at the top of each push rod. The bottom end of each push rod is connected to a damping contact element through a ball joint. The damping and shock absorption mechanism also includes a locking component for locking the position of the damping contact element behind the curved surface of the adaptive mother tube. The cooling mechanism is used to accurately supply cooling medium to the cutting contact area between the barrel cutter and the pipe wall for forced cooling. The cooling mechanism includes a cooling channel opened inside the push rod and the locking block. The lower side wall of the push rod has a medium outlet facing the cutting area of ​​the barrel cutter. The top of the locking block is connected to a flexible bellows, which passes through the first circular seat of the guide seat and is connected to the external pumping unit and the cooling medium storage tank.

2. The large-diameter heat pipe opening device according to claim 1, characterized by The locking assembly includes two annular slides that are circumferentially slidably disposed on the top wall of the second circular seat of the guide seat, with the two annular slides being coaxially fitted inside and out.

3. The large-diameter heat pipe opening device according to claim 2, characterized by The locking block is located between the inner annular slide and the outer annular slide. Multiple wedge-shaped locking blocks are fixedly installed on the side walls of the inner and outer annular slides that are close to each other. The wedge-shaped locking blocks correspond to the locking block.

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