A tee pipe end cutting device for a ship

Abstract

This invention belongs to the field of tee pipe processing technology, and relates to a cutting device for the closed end of a marine tee pipe. The invention includes a base, a rotating component, a clamping assembly, a driving assembly, and a cutting infeed mechanism. The clamping assembly and the tee pipe form a sealed space. A suction pump is connected to the sealed space through a first air passage. A piston cylinder is connected to the sealed space through a second air passage equipped with a pressure check valve. The piston rod is connected to the cutting blade. The suction pump creates a negative pressure in the sealed space. When the negative pressure reaches the opening threshold, the pressure check valve opens, and the piston rod moves outward, driving the cutting blade to advance. After the pipe wall is cut through, outside air rushes in, the negative pressure drops, the pressure check valve closes, and the cutting blade maintains its current depth. This invention utilizes negative pressure feedback to adaptively control the cutting depth based on the pipe wall thickness, avoiding tool overload and breakage. Simultaneously, the suction pump draws harmful gases generated during cutting into a purification chamber for treatment, improving the working environment. The invention features a compact structure and a high degree of automation.

Description

Technical Field

[0001] This invention belongs to the field of tee pipe processing technology, and relates to a cutting device for the closed end of a marine tee pipe. Background Technology

[0002] In shipbuilding and pipeline engineering, tees are widely used pipe fittings. When a tee is initially cast or machined, one end is usually kept closed. Before subsequent pipeline system assembly, a portion of the closed end needs to be cut off to open it, and the cut end must have a highly straight, flat surface.

[0003] Traditional pipe cutting equipment typically uses a mechanical transmission mechanism to directly control the cutting blade's descent or horizontal movement when cutting tees, thus forcibly cutting the pipe. However, due to the diverse specifications of tees used in marine piping systems and the significant differences in wall thickness between fittings used for different purposes, traditional cutting equipment cannot automatically and accurately control the cutting blade's penetration depth when dealing with pipes of varying wall thicknesses. Excessive penetration increases the probability of blade breakage due to vibration.

[0004] To address the aforementioned problems, this invention proposes a cutting device for the closed end of a tee pipe used in ships. Summary of the Invention

[0005] To address the problems existing in the background art, the present invention proposes a cutting device for the closed end of a tee pipe for ships.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a cutting device for the closed end of a marine tee pipe, comprising a base, and further comprising: A rotating component is rotatably mounted on the base. The rotating component is equipped with a clamping assembly for clamping and fixing the three-way pipe. When the clamping assembly is in the clamping state, it combines with the three-way pipe to form a sealed space. A suction pump, connected to the sealed space via a first air passage, is used to extract gas from the sealed space. The cutting feed mechanism includes a cutting blade, a piston cylinder, and a piston rod that is elastically slidably disposed inside the piston cylinder. The cutting blade is connected to one end of the piston rod. The piston cylinder is connected to the sealed space through a second air passage equipped with a pressure check valve. A drive assembly for driving the rotating component to rotate; The suction pump draws air to create a negative pressure in the sealed space. When the pressure check valve opens, the negative pressure inside the piston cylinder drives the piston rod to move outward, causing the cutting blade to cut into the wall of the tee pipe. When the wall of the tee pipe is cut through, outside air enters the sealed space through the cut, reducing the negative pressure value. The pressure check valve then closes automatically, and the cutting blade maintains its current cutting depth.

[0007] Furthermore, the clamping assembly includes a first cylinder and a second cylinder fixedly connected to the inner side of the rotating member. A first clamping plate is fixedly connected to the end of the first cylinder, and a second clamping plate is fixedly connected to the end of the second cylinder. The first clamping plate and the second clamping plate close the open end of the three-way pipe in the clamping state.

[0008] Furthermore, the first air passage includes a first semi-annular cavity opened inside the rotating member, a first fixing ring rotatably connected to the outside of the rotating member and fixedly connected to the base, and a first metal bellows fixedly connected to the side of the first clamping plate. The first metal bellows connects the sealed space and the first semi-annular cavity; A first connecting hole is provided on the side wall of the first semi-annular cavity, and the first semi-annular cavity is connected to the first fixed ring through the first connecting hole; The first retaining ring is connected to the suction port of the suction pump.

[0009] Furthermore, a filter screen is fixedly connected to one end of the first metal corrugated pipe that connects to the sealed space, and a purification box is connected to the exhaust end of the suction pump, the purification box containing purification liquid.

[0010] Furthermore, the second air passage includes a second semi-annular cavity opened inside the rotating member, a second fixing ring rotatably connected to the outside of the rotating member and fixedly connected to the base, and a second metal bellows fixedly connected to the side of the second clamping plate; The pressure check valve is fixedly installed inside the second metal bellows and only allows gas to flow from the second metal bellows to the sealed space; the other end of the second metal bellows is connected to the second semi-annular cavity. A second connecting hole is provided on the side wall of the second semi-annular cavity, and the second connecting hole communicates with the second fixed ring; The second fixing ring is connected to the piston cylinder through a third metal bellows.

[0011] Furthermore, the second clamping plate is provided with a pressure relief hole communicating with the second metal bellows; the second clamping plate is slidably connected to a sliding plate, and a baffle for blocking the pressure relief hole is fixedly connected to the sliding plate; Two sliding rods are fixedly connected to the side of the sliding plate. The sliding plate is slidably connected to the second clamping plate through the sliding rods, and a tension spring is fixedly connected between the sliding rods and the second clamping plate. After the second clamping plate moves away from the three-way pipe, the sliding plate, under the elastic action of the tension spring, drives the baffle away from the second clamping plate to open the pressure relief hole, allowing outside air to enter the interior of the piston cylinder through the pressure relief hole and the second air passage.

[0012] Furthermore, the drive assembly includes an end face gear fixedly connected to the side of the rotating component, a motor fixedly connected to the base, and a gear fixedly connected to the output shaft of the motor, wherein the gear meshes with the end face gear.

[0013] Furthermore, an electrically controlled slide rail is fixedly connected to the top of the base, and the piston cylinder is slidably mounted on the electrically controlled slide rail.

[0014] Furthermore, the clamping assembly also includes two hydraulic cylinders fixedly installed on the side of the rotating component, and a V-shaped clamp is fixedly connected to the free end of the hydraulic cylinder. The V-shaped clamp is used to clamp and fix the outer wall of the tee pipe.

[0015] Compared with the prior art, the present invention has the following beneficial effects: After the first and second clamping plates clamp the tee pipe, a sealed space is formed inside the tee pipe. Then, the sealed space is sucked in, and the sealed space sucks in the piston cylinder, causing the cutting blade to gradually cut into the wall of the tee pipe. During the process of the cutting blade gradually cutting into the wall of the tee pipe, once the wall of the tee pipe is cut through, the cutting blade will automatically stop its deeper cutting and maintain the current cutting depth. This achieves automatic adjustment of the cutting depth according to the wall thickness of the pipe, avoiding excessive cutting depth and preventing cutting blade vibration, breakage, or jamming caused by excessive cutting depth, thereby improving the stability of the cutting process and the service life of the cutting blade.

[0016] After the wall of the T-connector is cut through, the harmful gases generated during the cutting process are actively drawn into the T-connector and sequentially pass through a filter, the first metal corrugated pipe, the first semi-annular cavity, the first fixing ring, and the suction pump into the purification tank. There, they are fully absorbed and treated by the purification liquid before being discharged. This achieves highly efficient capture and purification of cutting exhaust gases, preventing the diffusion of harmful gases within the factory, effectively protecting the occupational health of operators, and meeting green manufacturing requirements. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention in the first direction; Figure 2 This is a schematic diagram of the structure in the second direction of the present invention; Figure 3 This is a cross-sectional view of the rotating component in this invention; Figure 4 This is a cross-sectional view of the piston cylinder in this invention; Figure 5 This is a schematic diagram of the structure of the second clamping plate in this invention; Figure 6 This is a schematic diagram of the rotating component in this invention from a first-view perspective; Figure 7 This is a schematic diagram of the rotating component in this invention from a second perspective; Figure 8 This is a cross-sectional view of the rotating component at its first position in this invention; Figure 9 This is a cross-sectional view of the rotating component at the second position in this invention.

[0018] In the diagram: 1. Base; 2. Rotating component; 3. Hydraulic cylinder; 4. V-shaped clamping plate; 5. First cylinder; 6. First clamping plate; 7. Filter screen; 8. First metal bellows; 9. First semi-annular cavity; 10. First connecting hole; 11. First fixing ring; 12. Suction pump; 13. Purification box; 14. Second cylinder; 15. Second clamping plate; 16. Sliding plate; 17. Sliding rod; 18. Tension spring; 19. Pressure relief hole; 20. Baffle; 21. Pressure check valve; 22. Second metal bellows; 23. Second semi-annular cavity; 24. Second connecting hole; 25. Second fixing ring; 26. Third metal bellows; 27. Piston cylinder; 28. Piston rod; 29. ​​Spring; 30. Cutting blade; 31. Electrically controlled slide rail; 32. End face gear; 33. Gear; 34. Motor; 35. T-junction. Detailed Implementation

[0019] Example 1: As Figures 1-9 As shown, the technical solution adopted by the present invention is as follows: A cutting device for the closed end of a marine tee pipe includes a base 1, a rotating component 2, a clamping assembly, a driving assembly, and a cutting feed mechanism.

[0020] like Figure 2 As shown, the rotating component 2 is rotatably mounted above the base 1. The drive assembly is used to drive the rotating component 2 to rotate relative to the base 1. Specifically, the drive assembly includes a motor 34, an end face gear 32, and a gear 33. The motor 34 is fixedly mounted on the base 1, the gear 33 is fixedly connected to the output shaft of the motor 34, the end face gear 32 is coaxially fixedly connected to the rotating component 2, and the end face gear 32 meshes with the gear 33.

[0021] The rotating component 2 includes a rotating ring and a circular plate, with the circular plate fixedly connected to one side of the rotating ring. A circular hole is provided on the circular plate.

[0022] The clamping assembly is mounted on the rotating part 2 and is used to clamp and fix the tee pipe 35.

[0023] like Figure 1 , Figure 2 , Figure 3 As shown, the clamping assembly includes two hydraulic cylinders 3, a first cylinder 5, and a second cylinder 14. A V-shaped clamping plate 4 is fixedly connected to the free end of each hydraulic cylinder 3, and the two V-shaped clamping plates 4 are symmetrically arranged. A first clamping plate 6 is fixedly connected to the end of the first cylinder 5, and a second clamping plate 15 is fixedly connected to the end of the second cylinder 14.

[0024] During processing, the T-shaped pipe 35 is placed into the rotating part 2, and the closed end of the T-shaped pipe 35 is inserted into the round hole. The two hydraulic cylinders 3 are controlled to extend, driving the V-shaped clamping plates 4 to move towards each other and clamp the outer wall of the T-shaped pipe 35. Then, the first cylinder 5 and the second cylinder 14 are controlled to extend simultaneously, driving the first clamping plate 6 and the second clamping plate 15 to move towards each other, pressing the T-shaped pipe 35 from the end face. At the same time, the first clamping plate 6 and the second clamping plate 15 seal the open end of the T-shaped pipe 35, so that the first clamping plate 6, the second clamping plate 15 and the T-shaped pipe 35 together form a closed space.

[0025] A suction pump 12 is installed on the base 1 to generate negative pressure in the sealed space. The suction pump 12 is connected to the sealed space through the first air passage.

[0026] like Figure 3 As shown, specifically, the first gas path includes a first metal bellows 8, a first semi-annular cavity 9, and a first fixing ring 11. One end of the first metal bellows 8 is fixedly connected to the side of the first clamping plate 6, and the first clamping plate 6 has a first through hole communicating with the first metal bellows 8. A filter screen 7 is fixedly installed on the first clamping plate 6 to block the first through hole. The filter screen 7 filters the gas entering the first gas path. The other end of the first metal bellows 8 is fixedly connected to the rotating member 2. The first semi-annular cavity 9 is opened on the rotating member 2 and communicates with the first metal bellows 8. The first fixing ring 11 is fixedly connected to the base 1 and rotatably connected to the rotating member 2. A first connecting hole 10 is opened on the side wall of the first semi-annular cavity 9. The first semi-annular cavity 9 is kept in communication with the first fixing ring 11 through the first connecting hole 10.

[0027] The suction end of the suction pump 12 is connected to the first fixed ring 11. When the suction pump 12 is started, the gas in the three-way pipe 35 flows out sequentially through the first metal bellows 8, the first semi-annular cavity 9, the first connecting hole 10 and the first fixed ring 11.

[0028] Preferably, a purification tank 13 is installed on the base 1, and the purification tank 13 contains purification liquid. The exhaust end of the suction pump 12 is connected to the purification tank 13. The gas drawn from the three-way pipe 35 by the suction pump 12 enters the purification tank 13, is purified, and then discharged.

[0029] The cutting feed mechanism includes a cutting blade 30, a piston cylinder 27, and a piston rod 28. The piston rod 28 is slidably and sealingly mounted inside the piston cylinder 27, with one end extending out of the piston cylinder 27 and connected to the cutting blade 30. Specifically, a mounting base is fixedly connected to the end of the piston rod 28, the cutting blade 30 is rotatably mounted on the mounting base, and a drive motor for rotating the cutting blade 30 is mounted on the mounting base. A spring 29 is fitted onto the piston rod 28, with one end fixedly connected to the piston cylinder 27 and the other end fixedly connected to the piston rod 28. The spring 29 constantly applies an elastic force to the piston rod 28, causing it to contract inwards towards the piston cylinder 27.

[0030] An electrically controlled slide rail 31 is fixedly connected to the top of the base 1, and the piston cylinder 27 is slidably mounted on the electrically controlled slide rail 31. The electrically controlled slide rail 31 drives the piston cylinder 27 to move, thereby causing the cutting blade 30 to move to the position of the three-way pipe 35 to be cut.

[0031] The piston cylinder 27 is connected to the sealed space through a second air passage. A pressure check valve 21 is installed in the second air passage. When the negative pressure in the sealed space reaches a certain value, the pressure check valve 21 opens, and the air in the piston cylinder 27 is drawn out through the second air passage, causing the piston rod 28 to move outward. The cutting blade 30 cuts into the wall of the three-way pipe 35. When the wall of the three-way pipe 35 is cut through, outside air enters the sealed space through the cut, reducing the negative pressure in the sealed space. This causes the pressure check valve 21 to close automatically, and the cutting blade 30 stops advancing and maintains the current cutting depth.

[0032] Specifically, such as Figure 4 As shown, the second air passage includes a second metal bellows 22, a second semi-annular cavity 23, a second fixed ring 25, and a third metal bellows 26.

[0033] One end of the second metal bellows 22 is fixedly connected to the second clamping plate 15, and the second clamping plate 15 has a second through hole communicating with the second metal bellows 22. The other end of the second metal bellows 22 is fixedly connected to the rotating member 2. The second semi-annular cavity 23 begins inside the rotating member 2 and communicates with the second metal bellows 22. A second communicating hole 24 is provided on the side wall of the second semi-annular cavity 23. The second fixed ring 25 is rotatably mounted on the outside of the rotating member 2 and is fixedly connected to the base 1. The second semi-annular cavity 23 maintains communication with the interior of the second fixed ring 25 through the second communicating hole 24. One end of the third metal bellows 26 communicates with the second fixed ring 25, and the other end communicates with the piston cylinder 27.

[0034] The pressure check valve 21 is installed at the end of the second metal bellows 22 near the second clamping plate 15. The pressure check valve 21 only allows gas to flow from the second metal bellows 22 to the sealed space, and it will only open when the pressure difference reaches a preset opening threshold.

[0035] As the suction pump 12 gradually increases the negative pressure in the sealed space, when the negative pressure reaches the opening threshold of the pressure check valve 21, the pressure check valve 21 opens. The negative pressure is then transmitted sequentially through the pressure check valve 21, the second metal bellows 22, the second semi-annular cavity 23, the second connecting hole 24, the second fixing ring 25, and the third metal bellows 26 to the inside of the piston cylinder 27, driving the piston rod 28 to extend outward. When the wall of the three-way pipe 35 is cut through, external gas enters the sealed space through the cut, reducing the negative pressure in the sealed space. The pressure check valve 21 automatically closes, and the cutting blade 30 maintains its cutting depth. The second air passage also dynamically connects when the rotating component 2 rotates.

[0036] like Figure 4 , Figure 5 As shown, the second clamping plate 15 has a pressure relief hole 19 communicating with the second through hole. A sliding plate 16 is elastically slidably connected to the second clamping plate 15. Two sliding rods 17 are fixedly connected to the sliding plate 16. The sliding rods 17 slide through the second clamping plate 15. A tension spring 18 is sleeved on the sliding rod 17, with one end of the tension spring 18 fixedly connected to the second clamping plate 15 and the other end fixedly connected to the sliding rod 17. A baffle 20 is fixedly connected to the sliding plate 16, which is used to block the pressure relief hole 19. Initially, under the action of the tension spring 18, the pressure relief hole 19 is open, and the second air passage is connected to the outside. When the clamping assembly clamps and fixes the three-way pipe 35, the sliding plate 16 abuts against the second clamping plate 15, and the baffle 20 blocks the pressure relief hole 19.

[0037] The second perforation on the second clamping plate 15 extends toward and through the sliding plate 16.

[0038] Working principle: In the initial state, both the first cylinder 5 and the second cylinder 14 are in a shortened state, and the first clamping plate 6 and the second clamping plate 15 are far apart. The two hydraulic cylinders 3 are also in a shortened state, and the V-shaped clamping plates 4 are far apart. The piston rod 28 retracts into the piston cylinder 27 under the elastic action of the spring 29. The sliding plate 16 moves away from the second clamping plate 15 under the tension of the tension spring 18, and the pressure relief hole 19 is open, allowing the second metal bellows 22 to communicate with the outside through the pressure relief hole 19.

[0039] During processing, the closed end of the three-way pipe 35 is inserted into the round hole on the rotating part 2, and the pipe wall portion formed by the two open ends of the three-way pipe 35 is brought into contact with the side of the rotating part 2. First, the two hydraulic cylinders 3 are extended, driving the two V-shaped clamps 4 to move towards each other, clamping the outer wall of the three-way pipe 35, thus achieving initial fixation of the three-way pipe 35. Subsequently, the first cylinder 5 and the second cylinder 14 are extended simultaneously, driving the first clamp 6 and the second clamp 15 to move towards each other, pressing the three-way pipe 35 from the end face. During this process, the first clamp 6 and the second clamp 15 are in close contact with the corresponding end faces of the three-way pipe 35, while the sliding plate 16 is subjected to the reaction force of the three-way pipe 35 and overcomes the tension of the tension spring 18 to move towards the second clamp 15 and abut against the second clamp 15, so that the baffle 20 blocks the pressure relief hole 19. At this time, a sealed space is formed inside the three-way pipe 35, and this sealed space is isolated from the outside.

[0040] After clamping and fixing, the electrically controlled slide rail 31 is activated, driving the piston cylinder 27 to move horizontally, so that the cutting blade 30 moves to the position to be cut on the tee pipe 35. Then, the rotation of the cutting blade 30 is started, and the suction pump 12 is started simultaneously.

[0041] When the suction pump 12 is working, it evacuates the sealed space through the first fixed ring 11, the first connecting hole 10, the first semi-annular cavity 9, and the first metal bellows 8. Since the end of the three-way pipe 35 is still in a closed state before being cut, the gas in the sealed space is continuously extracted, and its internal negative pressure value gradually increases.

[0042] When the negative pressure in the sealed space reaches the preset opening threshold of the pressure check valve 21, the pressure check valve 21 is opened, and the air in the piston cylinder 27 is extracted in sequence through the third metal bellows 26, the second fixed ring 25, the second semi-annular cavity 23, and the second metal bellows 22.

[0043] Under the influence of negative pressure suction, piston rod 28 extends outward against the elastic force of spring 29, driving cutting blade 30 to move slowly and steadily towards the wall of T-connector 35, gradually cutting into the wall. As cutting blade 30 rotates and feeds, the cutting depth continuously increases. Once cutting blade 30 cuts through the wall of T-connector 35, outside air rapidly rushes into the sealed space from the cut, causing a drop in negative pressure within the sealed space. This automatically closes pressure check valve 21, locking the negative pressure inside piston cylinder 27, stopping piston rod 28 from extending, and cutting blade 30 maintains its current cutting depth without further advancement. Simultaneously, because a certain negative pressure is maintained inside piston cylinder 27, cutting blade 30 and piston rod 28 are less likely to move away from T-connector 35 when subjected to external forces, thus ensuring the stability of the subsequent circumferential cutting process. It realizes the function of automatically adjusting the feed depth according to the actual wall thickness of the 35mm T-joint pipe, avoiding the risk of tool vibration and breakage caused by excessive feed depth, that is, avoiding the feed from continuing to feed after the cut-off condition has been met.

[0044] After the cutting blade 30 stops advancing, the motor 34 is started. The motor 34 drives the rotating component 2 to rotate relative to the base 1 through the meshing of the gear 33 and the end face gear 32. The rotating component 2 drives the V-shaped clamping plate 4, the first clamping plate 6, the second clamping plate 15, and the clamped T-shaped pipe 35 to rotate synchronously. Since the cutting blade 30 has cut into the pipe wall to a certain depth, as the T-shaped pipe 35 rotates, the cutting blade 30 performs a complete annular cut on the pipe wall, finally cutting off the closed end of the T-shaped pipe 35 to form a flat end.

[0045] During the circumferential cutting process, the kerf remains constant. As the suction pump 12 operates continuously, outside air is continuously drawn into the tee pipe 35 through the kerf, simultaneously bringing in harmful gases generated during the cutting process. The airflow containing harmful gases flows sequentially through the filter screen 7, the first metal corrugated pipe 8, the first semi-annular cavity 9, the first connecting hole 10, and the first fixing ring 11, finally being pumped into the purification chamber 13 by the suction pump 12. The purification liquid within the purification chamber 13 neutralizes and absorbs the harmful gases, and the purified gas is then released into the outside atmosphere. This process effectively prevents harmful gases from polluting the factory environment and protects the health of the operators.

[0046] During the overall rotation of the rotating component 2, since the first semi-annular cavity 9 and the first fixed ring 11, and the second semi-annular cavity 23 and the second fixed ring 25 are all annular sliding seals, the first air passage and the second air passage are always connected and the negative pressure transmission or gas suction will not be interrupted due to rotation.

[0047] After the closed end of the three-way pipe 35 is completely cut off and a flat opening is formed, the motor 34 is turned off, stopping the rotation of the rotating part 2. Then, the first cylinder 5 and the second cylinder 14 are shortened, causing the first clamping plate 6 and the second clamping plate 15 to move away from the three-way pipe 35, releasing the end face clamping. When the second clamping plate 15 disengages from the three-way pipe 35, the sliding plate 16 moves away from the second clamping plate 15 under the elastic tension of the tension spring 18, driving the baffle 20 away from the pressure relief hole 19, opening the pressure relief hole 19. At this time, outside air enters the piston cylinder 27 through the pressure relief hole 19, the second perforation, the second metal bellows 22, the second semi-annular cavity 23, the second connecting hole 24, the second fixing ring 25, and the third metal bellows 26 in sequence, and the pressure inside the piston cylinder 27 gradually returns to atmospheric pressure. Under the elastic restoring force of the spring 29, the piston rod 28 automatically retracts into the piston cylinder 27, driving the cutting blade 30 back to its initial position.

[0048] Finally, the two hydraulic cylinders 3 are shortened, causing the two V-shaped clamps 4 to move away from the tee pipe 35, releasing the outer wall clamp. At this point, the machined tee pipe 35 can be removed from the rotating part 2, ready for machining the next tee pipe 35.

[0049] Example 2: This example is an improvement based on Example 1.

[0050] To further improve the axial stability of the cutting blade 30 during the circumferential cutting process and avoid piston rod 28 vibration caused by cutting force fluctuations or vibrations, an electromagnetic radial brake is fixedly installed inside the piston cylinder 27. The electromagnetic radial brake is coaxially fitted onto the outer periphery of the piston rod 28 and electrically connected to the controller. When the electromagnetic radial brake receives a release signal, it remains in a released state to allow the piston rod 28 to slide freely axially. When it receives a clamping signal, it tightly clamps the outer wall surface of the piston rod 28 in the radial direction to achieve rigid locking of the axial displacement of the piston rod 28.

[0051] Preferably, a pressure sensor (not shown) is installed inside the first fixing ring 11, and the pressure sensor is electrically connected to the controller. Since the first fixing ring 11 is connected to the sealed space through the first air passage, the negative pressure value measured by the pressure sensor can accurately reflect the negative pressure state in the sealed space, and the first fixing ring 11 is a stationary component, which facilitates wiring and maintenance.

[0052] When the suction pump 12 is working continuously, the air pressure sensor transmits the air pressure in the sealed space to the controller in real time. During the process of the cutting blade 30 cutting into the pipe wall, the negative pressure value in the sealed space remains stable or rises slowly because the cut is not yet complete. When the cutting blade 30 cuts through the pipe wall, a large amount of outside air rushes in, causing the negative pressure value to drop sharply. When the controller detects that the decrease in negative pressure value per unit time exceeds a preset threshold, it determines that the pressure check valve 21 has closed, the cutting blade 30 has stopped advancing, and the current cutting depth has been reached. At this time, the controller sends a clamping signal to the electromagnetic radial brake, causing the electromagnetic radial brake to tightly clamp the outer wall surface of the piston rod 28 in the radial direction, thereby rigidly locking the axial displacement of the piston rod 28.

[0053] Then the motor 34 can be started to perform circumferential cutting. Since the piston rod 28 is rigidly locked, the cutting blade 30 will not vibrate axially during the circumferential cutting process due to fluctuations in cutting force, tool vibration, or slight changes in negative pressure, thus ensuring the flatness and dimensional accuracy of the cut.

[0054] After the circumferential cutting is completed, the controller first shuts off the rotation of motor 34 and cutting blade 30, and shuts off suction pump 12. Then, the controller sends a release signal to the electromagnetic radial brake to release the lock on piston rod 28.

Claims

1. A tee pipe closed end cutting apparatus for a marine vessel comprising a base (1) characterised in that, Also includes: Rotary component (2) is rotatably mounted on the base (1). The rotating component (2) is provided with a clamping assembly for clamping and fixing the three-way pipe (35). The clamping assembly and the three-way pipe (35) are combined together to form a sealed space in the clamping state. A suction pump (12) is connected to the sealed space through a first air passage and is used to extract gas from the sealed space. The cutting feed mechanism includes a cutting blade (30), a piston cylinder (27), and a piston rod (28) that is elastically slidably disposed in the piston cylinder (27). The cutting blade (30) is connected to one end of the piston rod (28); and the piston cylinder (27) is connected to the sealed space through a second air passage equipped with a pressure check valve (21). A drive assembly for driving the rotating component (2) to rotate; The suction pump (12) draws air to create a negative pressure in the sealed space. When the pressure check valve (21) is opened, the negative pressure generated in the piston cylinder (27) drives the piston rod (28) to move outward, causing the cutting blade (30) to cut into the wall of the three-way pipe (35). When the wall of the three-way pipe (35) is cut through, outside air enters the sealed space through the cut, reducing the negative pressure value. The pressure check valve (21) automatically closes, and the cutting blade (30) maintains the current cutting depth.

2. A tee pipe end cutting apparatus for a marine vessel as claimed in claim 1 wherein: The clamping assembly includes a first cylinder (5) and a second cylinder (14) fixedly connected to the inner side of the rotating part (2). The end of the first cylinder (5) is fixedly connected to a first clamping plate (6), and the end of the second cylinder (14) is fixedly connected to a second clamping plate (15). The first clamping plate (6) and the second clamping plate (15) close the opening end of the three-way pipe (35) in the clamping state.

3. A tee pipe end cutting apparatus for a marine vessel as claimed in claim 2 wherein: The first air passage includes a first semi-annular cavity (9) opened inside the rotating part (2), a first fixing ring (11) rotatably connected to the outside of the rotating part (2) and fixedly connected to the base (1), and a first metal bellows (8) fixedly connected to the side of the first clamping plate (6). The first metal bellows (8) connects the sealed space and the first semi-annular cavity (9). A first connecting hole (10) is provided on the side wall of the first semi-annular cavity (9), and the first semi-annular cavity (9) is connected to the first fixed ring (11) through the first connecting hole (10); The first fixing ring (11) is connected to the suction port of the suction pump (12).

4. A tee pipe end cutting apparatus for a marine vessel as claimed in claim 3 wherein: The first metal bellows (8) is connected to a filter screen (7) at one end of the sealed space, and the exhaust end of the suction pump (12) is connected to a purification box (13), which contains purification liquid.

5. A tee pipe end cutting apparatus for a marine vessel as defined in claim 2 wherein: The second air passage includes a second semi-annular cavity (23) opened inside the rotating part (2), a second fixing ring (25) rotatably connected to the outside of the rotating part (2) and fixedly connected to the base (1), and a second metal bellows (22) fixedly connected to the side of the second clamping plate (15). The pressure check valve (21) is installed inside the second metal bellows (22), allowing gas to flow from the second metal bellows (22) to the sealed space; the other end of the second metal bellows (22) is connected to the second semi-annular cavity (23); A second connecting hole (24) is provided on the side wall of the second semi-annular cavity (23), and the second connecting hole (24) is connected to the second fixing ring (25); The second fixing ring (25) is connected to the piston cylinder (27) through the third metal bellows (26).

6. A tee pipe end cutting apparatus for a marine vessel as claimed in claim 5 wherein: The second clamping plate (15) is provided with a pressure relief hole (19) communicating with the second metal bellows (22); the second clamping plate (15) is slidably connected to a sliding plate (16), and a baffle (20) for blocking the pressure relief hole is fixedly connected to the sliding plate (16). Two sliding rods (17) are fixedly connected to the side of the sliding plate (16). The sliding plate (16) is slidably connected to the second clamping plate (15) through the sliding rods (17). A tension spring (18) is fixedly connected between the sliding rods (17) and the second clamping plate (15). After the second clamping plate (15) moves away from the three-way pipe (35), the sliding plate (16) drives the baffle (20) away from the second clamping plate (15) under the elastic action of the tension spring (18) to open the pressure relief hole (19), so that outside air enters the interior of the piston cylinder (27) through the pressure relief hole (19) and the second air passage.

7. A tee pipe end cutting apparatus for a marine vessel as defined in claim 1 wherein: The drive assembly includes an end face gear (32) fixedly connected to the side of the rotating part (2), a motor (34) fixedly connected to the base (1), and a gear (33) fixedly connected to the output shaft of the motor (34). The gear (33) meshes with the end face gear (32).

8. A tee pipe end cutting apparatus for a marine vessel as defined in claim 1, wherein: The top of the base (1) is fixedly connected to an electrically controlled slide rail (31), and the piston cylinder (27) is slidably mounted on the electrically controlled slide rail (31).

9. A cutting device for the closed end of a marine tee pipe according to claim 2, characterized in that: The clamping assembly also includes two hydraulic cylinders (3) fixedly installed on the side of the rotating part (2). The free end of the hydraulic cylinder (3) is fixedly connected to a V-shaped clamp (4), which is used to clamp and fix the outer wall of the three-way pipe (35).

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