A kind of pressure vessel tank pipe inner wall surfacing layer precision boring processing device

Abstract

This application belongs to the technical field of boring machining equipment, specifically relating to a precision boring machine for the weld overlay layer on the inner wall of a pressure vessel tank nozzle, including a machine bed and a boring platform. This invention utilizes a heat exchange and cooling mechanism, incorporating a heat-conducting component inside the boring tube. A heat-conducting rod directly transfers the heat generated by the boring head during cutting to a porous heat exchange plate, which then exchanges heat with the coolant inside the heat exchange tube. A support frame provides stable support for the heat-conducting rod, and an insulation tube reduces the loss of cold air inside the heat exchange tube. Compared to relying solely on externally poured coolant, this structure allows the coolant to penetrate deep into the boring tube, shortening the heat transfer path and increasing the heat exchange area. This ensures that heat from the boring head and workpiece is promptly removed, thereby reducing the wear rate of the boring head and the thermal deformation of the workpiece. This helps maintain the dimensional accuracy and surface roughness of the weld overlay layer on the inner wall of the pressure vessel tank nozzle and extends the tool life.

Description

Technical Field

[0001] This invention belongs to the technical field of boring processing equipment, specifically a precision boring processing equipment for the weld overlay layer on the inner wall of a pressure vessel tank nozzle. Background Technology

[0002] In pressure vessel manufacturing, the inner wall of the vessel's nozzles typically requires a corrosion-resistant or wear-resistant overlay. After welding, this overlay is usually precision-machined using a boring machine. Such machines in related technologies typically include a machine bed, a boring platform, a tool holder, a boring tube, and a boring head. The boring tube is mounted on the tool holder, and the boring head is located at the upper end of the boring tube. During machining, a multi-jaw chuck rotates the workpiece, and the boring platform moves along the machine bed. Due to the confined space inside the nozzle and the often high hardness and difficulty of cutting the overlay material, the boring head generates a large amount of heat during cutting. Chip and coolant removal is also difficult. Insufficient cooling can easily lead to accelerated wear of the boring head and increased thermal deformation of the workpiece, thus affecting the dimensional accuracy and surface quality of the machining.

[0003] In existing technologies, cooling of the boring zone is mostly achieved through external coolant pouring or simple internal cooling. With external pouring, the coolant often struggles to accurately reach the boring tool tip, especially for deeper pipe walls, resulting in limited cooling effectiveness. While simple internal cooling introduces coolant into the boring tube, the supply pressure is easily affected by pipe resistance and changes in cutting conditions, leading to unstable spray pressure and flow. Low pressure prevents effective coolant delivery to the cutting zone, while high pressure can cause pipe vibration, coolant splashing, and even compromise machining safety. Existing coolant supply systems typically lack a pressure regulating structure adapted to the internal pressure of the boring tube, making it difficult to automatically adjust coolant spray according to actual machining conditions.

[0004] Furthermore, existing boring devices often rely on the flow of coolant to remove heat, resulting in limited heat exchange area and efficiency. The heat transmitted from the boring head cannot be exchanged promptly, leading to unsatisfactory cooling. In some structures, interference can easily occur between the nozzle, delivery pipe, and tool holder, making installation and adjustment inconvenient. The preload of the pressure regulating spring is also difficult to adjust according to machining conditions, resulting in poor adaptability. Therefore, existing precision boring devices for the weld overlay layer on the inner wall of pressure vessel tank nozzles still require improvement in terms of cooling targeting, fluid supply stability, heat exchange efficiency, and ease of installation and adjustment. Therefore, a precision boring device for the weld overlay layer on the inner wall of pressure vessel tank nozzles needs to be designed. Summary of the Invention

[0005] The purpose of this invention is to provide a precision boring machine for the weld overlay layer on the inner wall of the nozzle of a pressure vessel in order to solve the above-mentioned problems, thereby solving the problems mentioned in the background art.

[0006] To address the aforementioned problems, this invention provides a technical solution for precision boring of the weld overlay layer on the inner wall of a pressure vessel tank nozzle:

[0007] A precision boring machine for the weld overlay layer on the inner wall of a pressure vessel tank nozzle includes a bed and a boring platform. A tool holder is installed at the upper end of the boring platform, and a boring tube is installed inside the tool holder. A boring head is installed at the upper end of the boring tube. A heat exchange and cooling mechanism is provided on the boring tube. The heat exchange and cooling mechanism includes a heat exchange tube, a pressure tube, and a heat conduction component. The heat exchange tube is fixedly installed inside the boring tube. A pressure tube is fixedly installed at the upper part of the heat exchange tube away from the boring head. A pressure regulating component is provided inside the pressure tube. A heat conduction component is provided inside the heat exchange tube.

[0008] The upper end of the boring platform is provided with a constant pressure liquid supply mechanism, which includes a constant pressure tank and a liquid delivery pipe. The constant pressure tank is installed on the upper end of the boring platform, and the liquid delivery pipe is fixedly installed on the upper end of the constant pressure tank. The coolant inside the constant pressure tank is transported through the liquid delivery pipe.

[0009] Preferably, the heat exchange and cooling mechanism further includes a delivery pipe, which is fixedly installed on the outside of the pressure pipe. A nozzle is fixedly installed at the end of the delivery pipe away from the pressure pipe, with the nozzle pointing towards the cutting edge of the boring head. A mounting bracket is provided on the outside of the nozzle, and the mounting bracket is bolted to the bottom of the boring tube. The nozzle can spray high-pressure coolant onto the boring part of the boring head.

[0010] Preferably, a support block is fixedly installed on the outside of the heat exchange tube, the support block is fixedly connected to the delivery pipe, the delivery pipe passes through the cutter holder but does not contact the cutter holder, and the delivery pipe can deliver coolant to the inside of the nozzle.

[0011] Preferably, the pressure regulating assembly includes a conical plug, which is slidably connected inside the pressure tube. A guide rod is fixedly installed at the upper end of the conical plug. An adjusting ring is slidably connected to the upper part of the inner wall of the pressure tube. An external threaded tube is fixedly installed at the upper end of the adjusting ring. An adjusting nut is fixedly installed at the upper outer side of the external threaded tube. An internal threaded ring is fixedly installed at the upper end of the pressure tube. The external threaded tube and the internal threaded ring are connected by threads, and the elastic force of the threshold spring can be adjusted by the threaded engagement between the external threaded tube and the internal threaded ring.

[0012] Preferably, a threshold spring is provided on the outer side of the guide rod. One end of the threshold spring contacts the adjusting ring, and the other end of the threshold spring is fixedly connected to the upper end of the conical plug. The guide rod passes through the adjusting ring and is movably connected to the external threaded tube. The conical plug can only be moved when the pressure inside the heat exchange tube is greater than the elastic force of the threshold spring.

[0013] Preferably, the heat-conducting assembly includes a heat-conducting rod, which is fixedly installed inside the boring tube. Multiple evenly distributed porous heat exchange plates are fixedly installed on the outer side of the heat-conducting rod. A support frame is fixedly installed in the middle of the right inner wall of the heat exchange tube, and the support frame is fixedly connected to the heat-conducting rod. An insulation tube is fixedly installed inside the heat exchange tube. The heat-conducting rod can transfer the heat generated by the boring head, and the heat can be exchanged with the liquid flowing inside the heat exchange tube through the heat-conducting rod and the porous heat exchange plates.

[0014] Preferably, the constant pressure liquid supply mechanism further includes a mounting cover, which is threaded onto the outside of the connection port of the constant pressure box. A coolant supply pipe is fixedly installed inside the upper end of the mounting cover, and the other end of the coolant supply pipe is connected to the cooling station pump body of the machine tool, so that coolant can be continuously supplied to the inside of the constant pressure box through the cooling station pump body.

[0015] Preferably, a suction pipe is fixedly installed inside the constant pressure chamber, and the suction pipe is connected to the infusion pipe. The suction pipe can inject the coolant inside the constant pressure chamber into the suction pipe.

[0016] Preferably, an input pipe is fixedly installed on the side of the boring tube near the boring head. The input pipe is fixedly connected to the infusion pipe. The coolant inside the infusion pipe first enters the side of the boring tube near the boring head to perform preliminary cooling on the boring head.

[0017] Preferably, the boring platform is slidably disposed above the bed, and a multi-jaw chuck is disposed on the outer side of the output shaft of the bed. Multiple evenly distributed T-shaped mounting blocks are slidably connected inside the guide groove of the boring platform. The bolt rod at the upper end of the T-shaped mounting block passes through the bottom plate of the tool holder. A mounting nut is threaded onto the outer side of the bolt rod of the T-shaped mounting block. The mounting nut contacts the tool holder. The T-shaped mounting block can install and position the tool holder, and the multi-jaw chuck can drive the workpiece to rotate.

[0018] The beneficial effects of this invention are:

[0019] This invention employs a heat exchange and cooling mechanism. A heat exchange tube is fixedly installed inside the boring tube, and a heat-conducting component is installed inside the heat exchange tube. The heat generated by the boring head during the cutting process is directly transferred to a porous heat exchange plate using a heat-conducting rod. The porous heat exchange plate then exchanges heat with the coolant inside the heat exchange tube. A support frame provides stable support for the heat-conducting rod, and an insulation tube reduces the loss of cold air inside the heat exchange tube. Compared with relying solely on external pouring of coolant, this structure allows the coolant to penetrate deep into the boring tube, shortening the heat transfer path and increasing the heat exchange area. This ensures that the heat on the boring head and the workpiece is carried away in a timely manner, thereby reducing the wear rate of the boring head and the thermal deformation of the workpiece. This is beneficial for ensuring the dimensional accuracy and surface roughness of the weld overlay layer on the inner wall of the pressure vessel tank nozzle and extending the tool life.

[0020] This invention, by setting up a pressure regulating component and a constant pressure liquid supply mechanism, utilizes a constant pressure tank, mounting cover, coolant supply pipe, suction pipe, delivery pipe, and input pipe to form a stable coolant supply path. The coolant first enters the boring tube near the boring head for initial cooling, then enters the heat exchange pipe and pressure pipe. The conical plug in the pressure pipe opens after overcoming the spring force of the threshold spring under the guidance of the guide rod. The coolant then enters the nozzle through the delivery pipe and is sprayed towards the cutting edge of the boring head. The preload of the threshold spring can be changed by adjusting the nut, external threaded pipe, internal threaded ring, and adjusting ring, ensuring that the nozzle opens and sprays at the set pressure under different processing conditions. This avoids unstable coolant spraying, coolant waste, or pipeline vibration caused by fluctuations in the supply pressure, improving the targeting of cooling and processing safety.

[0021] This invention reduces friction, interference, and vibration between the delivery pipe and the tool holder by passing the delivery pipe through it without contacting it, and by setting up a support block and mounting bracket, thus keeping the nozzle position stable. The constant pressure tank is connected to the coolant supply pipe through a mounting cover, and the suction pipe introduces the coolant in the constant pressure tank into the delivery pipe. The multi-jaw chuck drives the workpiece to rotate, and the T-shaped mounting block and mounting nut fix the tool holder on the boring platform. The boring platform slides along the bed, thereby completing the relative movement between the workpiece and the tool. The device has a compact overall structure, is easy to install and adjust, and operates stably and reliably. It is suitable for precision boring of the weld overlay layer on the inner wall of the nozzle of pressure vessel tank. Attached Figure Description

[0022] For ease of explanation, the present invention will be described in detail below with reference to specific embodiments and accompanying drawings.

[0023] Figure 1 This is a perspective view of the overall structure of the present invention;

[0024] Figure 2 For the present invention Figure 1 Processing status diagram;

[0025] Figure 3 For the present invention Figure 1The three-dimensional shape of the knife holder Figure 1 ;

[0026] Figure 4 For the present invention Figure 1 The three-dimensional shape of the knife holder Figure 2 ;

[0027] Figure 5 For the present invention Figure 4 A three-dimensional sectional view of the boring tube;

[0028] Figure 6 For the present invention Figure 4 A three-dimensional sectional view of the heat exchanger tubes;

[0029] Figure 7 For the present invention Figure 4 A three-dimensional sectional view of the constant pressure chamber;

[0030] Figure 8 For the present invention Figure 6 A three-dimensional view of an externally threaded pipe;

[0031] Figure 9 For the present invention Figure 3 Enlarged view of the A-section structure;

[0032] In the diagram: 1. Bed; 2. Boring platform; 3. Tool holder; 4. Boring tube; 5. Boring head; 6. Heat exchange and cooling mechanism; 7. Pressure regulating component; 8. Constant pressure liquid supply mechanism; 9. Heat conduction component; 10. Multi-jaw chuck; 11. T-shaped mounting block; 12. Mounting nut; 61. Heat exchange tube; 62. Pressure tube; 63. Delivery tube; 64. Nozzle; 65. Mounting bracket; 66. Support block; 71. Conical plug; 72. Guide rod; 73. Threshold spring; 74. Adjusting ring; 75. External threaded tube; 76. Adjusting nut; 77. Internal threaded ring; 81. Constant pressure box; 82. Liquid delivery tube; 83. Mounting cover; 84. Coolant supply tube; 85. Input tube; 86. Suction tube; 91. Heat conduction rod; 92. Perforated heat exchange plate; 93. Support frame; 94. Insulation tube. Detailed Implementation

[0033] like Figure 1-9 As shown, the specific implementation adopts the following technical solution:

[0034] A precision boring machine for the weld overlay layer on the inner wall of a pressure vessel tank nozzle includes a bed 1 and a boring platform 2. A tool holder 3 is mounted on the upper end of the boring platform 2, and a boring tube 4 is installed inside the tool holder 3. A boring head 5 is mounted on the upper end of the boring tube 4. A heat exchange and cooling mechanism 6 is provided on the boring tube 4. The heat exchange and cooling mechanism 6 includes a heat exchange tube 61, a pressure tube 62, and a heat conduction component 9. The heat exchange tube 61 is fixedly installed inside the boring tube 4, and the heat exchange tube 61 is located away from the boring head 5. A pressure pipe 62 is fixedly installed on the upper part of one end, and a pressure regulating component 7 is installed inside the pressure pipe 62. A heat conduction component 9 is installed inside the heat exchange pipe 61. A constant pressure liquid supply mechanism 8 is installed on the upper end of the boring platform 2. The constant pressure liquid supply mechanism 8 includes a constant pressure tank 81 and a liquid delivery pipe 82. A constant pressure tank 81 is installed on the upper end of the boring platform 2, and a liquid delivery pipe 82 is fixedly installed on the upper end of the constant pressure tank 81. The coolant inside the constant pressure tank 81 is transported through the liquid delivery pipe 82.

[0035] The heat exchange and cooling mechanism 6 also includes a delivery pipe 63. The delivery pipe 63 is fixedly installed on the outside of the pressure pipe 62. A nozzle 64 is fixedly installed at the end of the delivery pipe 63 away from the pressure pipe 62. The nozzle 64 points towards the cutting edge of the boring head 5. A mounting bracket 65 is provided on the outside of the nozzle 64. The mounting bracket 65 is installed below the boring tube 4 by bolts. The nozzle 64 can spray high-pressure coolant onto the boring part of the boring head 5. A support block 66 is fixedly installed on the outside of the heat exchange tube 61. The support block 66 is fixedly connected to the delivery pipe 63. The delivery pipe 63 passes through the tool holder 3 but does not contact the tool holder 3. The delivery pipe 63 can deliver coolant to the inside of the nozzle 64.

[0036] The pressure regulating component 7 includes a conical plug 71, which is slidably connected inside the pressure tube 62. A guide rod 72 is fixedly installed at the upper end of the conical plug 71. An adjusting ring 74 is slidably connected to the upper part of the inner wall of the pressure tube 62. An external threaded tube 75 is fixedly installed at the upper end of the adjusting ring 74. An adjusting nut 76 is fixedly installed at the upper outer side of the external threaded tube 75. An internal threaded ring 77 is fixedly installed at the upper end of the pressure tube 62. The external threaded tube 75 and the internal threaded ring 77 are connected by threads. The elastic force of the threshold spring 73 can be adjusted by the threaded engagement between the external threaded tube 75 and the internal threaded ring 77.

[0037] A threshold spring 73 is provided on the outer side of the guide rod 72. One end of the threshold spring 73 is in contact with the adjusting ring 74, and the other end of the threshold spring 73 is fixedly connected to the upper end of the conical plug 71. The guide rod 72 passes through the adjusting ring 74 and the external threaded tube 75 and is movably connected. The conical plug 71 can only be pushed to move when the pressure inside the heat exchange tube 61 is greater than the elastic force of the threshold spring 73.

[0038] The heat-conducting component 9 includes a heat-conducting rod 91, which is fixedly installed inside the boring tube 4. Multiple evenly distributed porous heat exchange plates 92 are fixedly installed on the outer side of the heat-conducting rod 91. A support frame 93 is fixedly installed in the middle of the right inner wall of the heat exchange tube 61. The support frame 93 is fixedly connected to the heat-conducting rod 91. An insulation pipe 94 is fixedly installed inside the heat exchange tube 61. The heat-conducting rod 91 can transfer the heat generated by the boring head 5. The heat can be exchanged with the liquid flowing inside the heat exchange tube 61 through the heat-conducting rod 91 and the porous heat exchange plates 92.

[0039] The constant pressure liquid supply mechanism 8 also includes a mounting cover 83, which is threaded onto the outside of the connection port of the constant pressure box 81. A coolant supply pipe 84 is fixedly installed inside the upper end of the mounting cover 83. The other end of the coolant supply pipe 84 is connected to the cooling station pump body of the machine tool. The pump body of the cooling station can continuously supply coolant to the inside of the constant pressure box 81. A suction pipe 86 is fixedly installed inside the constant pressure box 81. The suction pipe 86 is connected to the delivery pipe 82. The suction pipe 86 can inject the coolant inside the constant pressure box 81 into the suction pipe 86. An input pipe 85 is fixedly installed on the side of the boring tube 4 near the boring head 5. The input pipe 85 is fixedly connected to the delivery pipe 82. The coolant inside the delivery pipe 82 first enters the side of the boring tube 4 near the boring head 5 to perform preliminary cooling on the boring head 5.

[0040] The boring platform 2 is slidably mounted above the bed 1. A multi-jaw chuck 10 is provided on the outer side of the output shaft of the bed 1. Multiple evenly distributed T-shaped mounting blocks 11 are slidably connected inside the guide groove of the boring platform 2. The bolt rod at the upper end of the T-shaped mounting block 11 passes through the bottom plate of the tool holder 3. A mounting nut 12 is threaded on the outer side of the bolt rod of the T-shaped mounting block 11. The mounting nut 12 contacts the tool holder 3. The T-shaped mounting block 11 can install and position the tool holder 3. The multi-jaw chuck 10 can drive the workpiece to rotate.

[0041] By passing the delivery pipe 63 through the tool holder 3 without contacting it, and by setting up the support block 66 and the mounting bracket 65, the friction, interference and vibration between the delivery pipe 63 and the tool holder 3 are reduced, and the position of the nozzle 64 is kept stable. The constant pressure box 81 is connected to the coolant supply pipe 84 through the mounting cover 83. The suction pipe 86 introduces the coolant in the constant pressure box 81 into the delivery pipe 82. The multi-jaw chuck 10 drives the workpiece to rotate. The T-shaped mounting block 11 and the mounting nut 12 fix the tool holder 3 on the boring platform 2. The boring platform 2 slides along the bed 1, thereby completing the relative movement between the workpiece and the tool. The device has a compact overall structure, is easy to install and adjust, and is stable and reliable in operation. It is suitable for precision boring of the weld overlay layer on the inner wall of the pressure vessel tank pipe.

[0042] The usage state of this invention is as follows: During operation, the workpiece is first clamped on the multi-jaw chuck 10, and the multi-jaw chuck 10 drives the workpiece to rotate. The boring platform 2 is slidably set above the bed 1, the tool holder 3 is placed on the boring platform 2, the bolt rod of the T-shaped mounting block 11 passes through the bottom plate of the tool holder 3, the mounting nut 12 contacts the tool holder 3 and locks and positions the tool holder 3, the boring tube 4 is installed inside the tool holder 3, the boring head 5 is installed on the upper end of the boring tube 4, the heat exchange and cooling mechanism 6 enters the pipe along with the boring tube 4, the mounting bracket 65 is installed below the boring tube 4 by bolts, the nozzle 64 is fixed on the mounting bracket 65, the support block 66 is fixedly connected to the conveying pipe 63 and forms support for the conveying pipe 63. After the machine tool is started, the multi-jaw chuck 10 drives the workpiece to rotate, the boring platform 2 moves along the bed 1, so that the boring head 5 is aligned with the weld overlay layer on the inner wall of the pipe and begins boring.

[0043] During the coolant supply process, the coolant supply pipe 84 is connected to the machine tool cooling station pump body. The coolant enters the constant pressure tank 81 through the mounting cover 83. The coolant in the constant pressure tank 81 enters the delivery pipe 82 through the suction pipe 86, and is then transported to the input pipe 85 by the delivery pipe 82. The input pipe 85 is fixedly installed on the side of the boring tube 4 near the boring head 5. Therefore, the coolant first enters the position of the boring tube 4 near the boring head 5 to initially cool the boring head 5. As the coolant continues to enter the heat exchange tube 61, the heat exchange tube 61 and the pressure pipe 62 gradually fill with coolant. The constant pressure tank 81 plays a role in stabilizing the pressure during the coolant supply process, making it less likely for the coolant pressure in the delivery pipe 82 and the input pipe 85 to fluctuate significantly, thereby ensuring the continuity of subsequent jet cooling.

[0044] When the coolant in heat exchange tube 61 is heated and its pressure increases, the pressure is transmitted to the inside of pressure tube 62. The conical plug 71 inside pressure tube 62 is subjected to the coolant pressure. The guide rod 72 guides the movement of the conical plug 71. When the force of the coolant on the conical plug 71 exceeds the elastic force of the threshold spring 73, the conical plug 71 slides along the inner wall of pressure tube 62. The coolant in pressure tube 62 enters the nozzle 64 through the delivery pipe 63 and is sprayed from the nozzle 64 towards the cutting edge of the boring head 5. The 63 passes through the cutter holder 3 but does not contact it. The support block 66 supports the delivery pipe 63. The mounting bracket 65 fixes the nozzle 64 to prevent the nozzle 64 from shifting during spraying. The preload of the threshold spring 73 can be adjusted by adjusting the nut 76, the external threaded pipe 75, the internal threaded ring 77, and the adjusting ring 74, thereby changing the opening pressure of the conical plug 71. When the pressure decreases, the threshold spring 73 pushes the conical plug 71 to reset, so that the pressure pipe 62 maintains a stable pressure range.

[0045] During the boring process, the heat generated by the boring head 5 cutting the weld overlay is transferred to the porous heat exchange plate 92 via the heat conduction rod 91. The porous heat exchange plate 92 exchanges heat with the coolant in the heat exchange tube 61. The support frame 93 supports the heat conduction rod 91. The constant pressure liquid supply mechanism 8 continuously supplies coolant to the boring tube 4. The nozzle 64 continuously cools the cutting edge of the boring head 5. The chips and coolant generated during cutting are discharged from the machining area. The boring platform 2 continues to feed along the bed 1. The multi-jaw chuck 10 drives the workpiece to rotate, so that the boring head 5 completes precision boring along the weld overlay on the inner wall of the pipe. After the machining is completed, the liquid supply to the constant pressure box 81 is stopped. After the pressure in the pressure tube 62 drops and the conical plug 71 is reset, the boring tube 4 and the boring head 5 are removed. Then the multi-jaw chuck 10 is released and the workpiece is removed.

[0046] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope. All such changes and modifications fall within the scope of the present invention as claimed, which is defined by the appended claims and their equivalents.

Claims

1. A precision boring machine for the weld overlay layer on the inner wall of a pressure vessel tank nozzle, comprising a bed (1) and a boring platform (2), wherein a tool holder (3) is mounted on the upper end of the boring platform (2), characterized in that: The tool holder (3) is equipped with a boring tube (4), and a boring head (5) is installed at the upper end of the boring tube (4). A heat exchange and cooling mechanism (6) is provided on the boring tube (4). The heat exchange and cooling mechanism (6) includes a heat exchange tube (61), a pressure tube (62) and a heat conduction component (9). The heat exchange tube (61) is fixedly installed inside the boring tube (4). A pressure tube (62) is fixedly installed on the upper part of the heat exchange tube (61) away from the boring head (5). A pressure regulating component (7) is provided inside the pressure tube (62). A heat conduction component (9) is provided inside the heat exchange tube (61). The upper end of the boring platform (2) is provided with a constant pressure liquid supply mechanism (8). The constant pressure liquid supply mechanism (8) includes a constant pressure tank (81) and a liquid delivery pipe (82). The upper end of the boring platform (2) is equipped with a constant pressure tank (81), and the upper end of the constant pressure tank (81) is fixedly equipped with a liquid delivery pipe (82). The coolant inside the constant pressure tank (81) is transported through the liquid delivery pipe (82).

2. The precision boring machine for the weld overlay layer on the inner wall of a pressure vessel tank nozzle according to claim 1, characterized in that: The heat exchange and cooling mechanism (6) also includes a conveying pipe (63). The conveying pipe (63) is fixedly installed on the outside of the pressure pipe (62). A nozzle (64) is fixedly installed at the end of the conveying pipe (63) away from the pressure pipe (62). The nozzle (64) points towards the cutting edge of the boring head (5). A mounting bracket (65) is provided on the outside of the nozzle (64). The mounting bracket (65) is installed below the boring tube (4) by bolts.

3. The precision boring machine for the weld overlay layer on the inner wall of a pressure vessel tank nozzle according to claim 2, characterized in that: A support block (66) is fixedly installed on the outside of the heat exchange tube (61). The support block (66) is fixedly connected to the conveying pipe (63). The conveying pipe (63) passes through the knife holder (3) and does not contact the knife holder (3).

4. The precision boring machine for the weld overlay layer on the inner wall of a pressure vessel tank nozzle according to claim 1, characterized in that: The pressure regulating assembly (7) includes a conical plug (71), which is slidably connected inside the pressure tube (62). A guide rod (72) is fixedly installed at the upper end of the conical plug (71). An adjusting ring (74) is slidably connected to the upper part of the inner wall of the pressure tube (62). An external threaded tube (75) is fixedly installed at the upper end of the adjusting ring (74). An adjusting nut (76) is fixedly installed at the upper part of the outer side of the external threaded tube (75). An internal threaded ring (77) is fixedly installed at the upper end of the pressure tube (62). The external threaded tube (75) and the internal threaded ring (77) are connected by threads.

5. The precision boring machine for the weld overlay layer on the inner wall of a pressure vessel tank nozzle according to claim 4, characterized in that: A threshold spring (73) is provided on the outside of the guide rod (72). One end of the threshold spring (73) is in contact with the adjusting ring (74), and the other end of the threshold spring (73) is fixedly connected to the upper end of the conical plug (71). The guide rod (72) is movably connected through the adjusting ring (74) and the external threaded tube (75).

6. The precision boring machine for the weld overlay layer on the inner wall of a pressure vessel tank nozzle according to claim 1, characterized in that: The heat-conducting component (9) includes a heat-conducting rod (91). The heat-conducting rod (91) is fixedly installed inside the boring tube (4). Multiple evenly distributed porous heat exchange plates (92) are fixedly installed on the outside of the heat-conducting rod (91). A support frame (93) is fixedly installed in the middle of the right inner wall of the heat exchange tube (61). The support frame (93) is fixedly connected to the heat-conducting rod (91). An insulation tube (94) is fixedly installed inside the heat exchange tube (61).

7. The precision boring machine for the weld overlay layer on the inner wall of a pressure vessel tank nozzle according to claim 1, characterized in that: The constant pressure liquid supply mechanism (8) also includes a mounting cover (83), which is installed on the outside of the connection port of the constant pressure box (81) by a thread, and a coolant supply pipe (84) is fixedly installed inside the upper end of the mounting cover (83).

8. The precision boring machine for the weld overlay layer on the inner wall of a pressure vessel tank nozzle according to claim 1, characterized in that: The constant pressure box (81) is fixedly installed with a suction tube (86), which is connected to the infusion tube (82).

9. The precision boring device for the weld overlay layer on the inner wall of a pressure vessel tank nozzle according to claim 7, characterized in that: An input tube (85) is fixedly installed on the side of the boring tube (4) near the boring head (5), and the input tube (85) is fixedly connected to the infusion tube (82).

10. The precision boring machine for the weld overlay layer on the inner wall of a pressure vessel tank nozzle according to claim 1, characterized in that: The boring platform (2) is slidably disposed above the bed (1). A multi-jaw chuck (10) is disposed on the outer side of the output shaft of the bed (1). Multiple evenly distributed T-shaped mounting blocks (11) are slidably connected inside the guide groove of the boring platform (2). The bolt rod at the upper end of the T-shaped mounting block (11) passes through the bottom plate of the tool holder (3). A mounting nut (12) is threadedly installed on the outer side of the bolt rod of the T-shaped mounting block (11). The mounting nut (12) contacts the tool holder (3).

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