Pipe fitting welding seam cutting mechanism

Abstract

The invention provides a pipe fitting welding seam cutting mechanism. The pipe fitting welding seam cutting mechanism comprises a mounting part, a positioning shaft, a cutting tool and a first driving assembly. The positioning shaft is fixed on the mounting piece, a plurality of positioning blocks are arranged at one end, far away from the mounting piece, of the positioning shaft, and the positioning blocks are distributed along the circumferential direction of the positioning shaft; the positioning block can reciprocate in the radial direction of the positioning shaft. The cutting tool is arranged on the positioning shaft in a sleeving mode, and the rotating axis of the cutting tool coincides with the axis of the positioning shaft. The first driving assembly is in driving connection with the cutting tool; in the first state, the positioning block is close to the axis of the positioning shaft, and the positioning block can extend into the pipe fitting along with the positioning shaft to freely move; and in the second state, the positioning block is far away from the axis of the positioning shaft, and the positioning block is tightly attached to the inner wall of the pipe so as to fix the positioning shaft in the pipe. According to the welding seam cutting device, the rotating axis of the cutting tool can precisely coincide with the axis of the pipe fitting, cutting deviation caused by shaking or eccentricity of the pipe fitting in the cutting process is avoided, and therefore the welding seam cutting precision is remarkably improved.

Description

Technical Field

[0001] This application belongs to the field of nuclear power plant maintenance technology, and more specifically, relates to a pipe fitting weld cutting mechanism. Background Technology

[0002] Heat transfer tubes in nuclear power plant steam generators are critical heat exchange components in the reactor cooling system, and their operational status directly affects the safety and stability of nuclear power equipment. Under prolonged exposure to high temperatures, high pressures, and corrosive media, heat transfer tubes may suffer damage such as fatigue cracks and corrosion thinning. In such cases, tube plugging components are used to weld and seal the damaged heat transfer tubes to prevent leakage of radioactive media. However, when the original tube plugging components need to be replaced due to aging, corrosion, or other issues, residual annular weld metal remains on the heat transfer tube end face after removal. If these residual weld metals are not precisely treated, the new tube plugging components may not fit tightly against the heat transfer tube end face, affecting the sealing performance of the secondary sealing and potentially even triggering a secondary leakage risk.

[0003] Current tools for cutting residual weld seams on heat transfer tubes in steam generators employ a combination of external positioning and a cutting head. Based on the arrangement of the heat transfer tubes, the tool is first positioned using two empty heat transfer tubes adjacent to the tube to be cut. After positioning, the cutting head is assumed to be coaxial with the heat transfer tube, and then the cutting tool is operated to perform weld seam cutting. Existing cutting tools determine the coaxiality of the cutting head and the heat transfer tube by using a fixed positioning dimension (the distance from the cutting head to the two empty heat transfer tubes adjacent to the tube to be cut). However, due to cumulative assembly errors and heat transfer tube deformation, the cutting head and the heat transfer tube are not actually coaxial, leading to deviations in weld seam cutting accuracy and consequently affecting secondary tube plugging operations. Summary of the Invention

[0004] The purpose of this application is to provide a pipe weld cutting mechanism to solve the technical problem that the existing technology, by ensuring the coaxiality of the cutting head and the heat transfer pipe to be cut through a fixed positioning method, causes deviations in weld cutting accuracy.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: A pipe fitting weld seam cutting mechanism is provided, used to extend into the interior of a pipe fitting and cut the weld seam of the pipe fitting. The pipe fitting weld seam cutting mechanism includes an mounting component, a positioning shaft, a cutting tool, and a first driving assembly. The positioning shaft is fixed to the mounting component, and a plurality of positioning blocks are provided at the end of the positioning shaft away from the mounting component. The plurality of positioning blocks are distributed along the circumferential direction of the positioning shaft. The positioning blocks can reciprocate radially along the positioning shaft. The cutting tool is sleeved on the positioning shaft, and the rotation axis of the cutting tool coincides with the axis of the positioning shaft. The first driving assembly is drivenly connected to the cutting tool and is used to drive the cutting tool to rotate. The positioning blocks have a first state and a second state. In the first state, the positioning blocks are close to the axis of the positioning shaft, and the positioning blocks can move freely as the positioning shaft extends into the pipe fitting. In the second state, the positioning blocks are away from the axis of the positioning shaft, and the positioning blocks are in close contact with the inner wall of the pipe fitting to fix the positioning shaft inside the pipe fitting.

[0006] Furthermore, the positioning shaft is provided with a guide hole, which is arranged along the axial direction of the positioning shaft; the positioning shaft is provided with a plurality of hollowed-out portions corresponding to the positioning blocks, and the hollowed-out portions are connected to the guide holes; the positioning blocks are movably arranged in the hollowed-out portions one by one, and the side of the positioning block facing the guide hole is an inclined surface; a push rod is provided in the guide hole, and the outer side of the push rod is a conical surface, which cooperates with the inclined surface, and the push rod moves to drive the positioning block to switch between the first state and the second state.

[0007] Furthermore, elastic elements are fitted onto the plurality of positioning blocks, and the elastic elements constrain the plurality of positioning blocks onto the positioning shaft; or, Each of the positioning blocks is provided with an elastic element, one end of which is connected to the positioning block and the other end of which is connected to the positioning shaft.

[0008] Furthermore, the pipe fitting weld cutting mechanism also includes a cutting disc, which is sleeved on the positioning shaft and connected to the first drive assembly. The cutting tool is detachably mounted on the cutting disc.

[0009] Further, the first drive assembly includes a drive shaft, a first bevel gear, a second bevel gear, and a first drive motor; the drive shaft is coaxially sleeved on the positioning shaft and rotatably connected to the mounting component, and the cutting disc is fixed on the drive shaft; the first bevel gear is coaxially sleeved on one end of the drive shaft; the second bevel gear is disposed on one side of the first bevel gear and extends in a direction perpendicular to the axis of the drive shaft, and the second bevel gear meshes with the first bevel gear; the first drive motor is drivenly connected to the end of the second bevel gear away from the first bevel gear.

[0010] Furthermore, the pipe fitting weld cutting mechanism also includes an elastic guard, which is sleeved on the cutting disc and the cutting tool, and one end of the elastic guard is connected to the mounting component; the inner diameter of the elastic guard is larger than the outer diameter of the pipe fitting, and the elastic guard is used to prevent processing chips from splashing.

[0011] Furthermore, the mounting component is provided with an absorption hole, which communicates with the cavity inside the elastic shield. The absorption hole is used to connect an external suction device to collect the machining chips inside the elastic shield.

[0012] Furthermore, the pipe fitting weld cutting mechanism also includes a second drive assembly, which is connected to the push rod and is used to drive the push rod to reciprocate.

[0013] Furthermore, the second drive assembly includes a second drive motor and a conversion box, the input end of the conversion box being connected to the output end of the second drive motor, and the output end of the conversion box being connected to the push rod; the conversion box is used to convert the rotational motion of the second drive motor into the linear motion of the push rod.

[0014] Furthermore, a limit switch is installed on the mounting component, and the limit switch is oriented toward the positioning shaft extending toward the pipe component.

[0015] The beneficial effects of the pipe fitting weld cutting mechanism provided in this application are as follows: Compared with the prior art, this application sets a positioning block that can move radially on the positioning shaft. When the pipe fitting is inserted, the positioning block is in a first state close to the axis, which facilitates smooth entry into the pipe fitting. When it moves to the cutting position, the positioning block switches to a second state away from the axis and fits tightly against the inner wall of the pipe fitting, thus achieving stable fixation of the positioning shaft. This design allows the rotation axis of the cutting tool to be precisely aligned with the axis of the pipe fitting, effectively avoiding cutting deviations caused by pipe fitting shaking or eccentricity during the cutting process, thereby significantly improving the accuracy of weld cutting. The positioning of the pipe fitting weld cutting mechanism can be completed by the positioning shaft and the positioning block, reducing the number of positioning devices. The overall size of the pipe fitting weld cutting mechanism is small and lightweight, making it easy to operate on site. At the same time, the switching operation between the two states of the positioning block is convenient and applicable to pipe fittings with different inner diameter specifications, enhancing the versatility and practicality of the mechanism. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the pipe fitting weld cutting mechanism provided in the embodiments of this application; Figure 2 Cross-sectional view of the pipe fitting weld cutting mechanism provided in the embodiments of this application. Figure 1 ; Figure 3 Cross-sectional view of the pipe fitting weld cutting mechanism provided in the embodiments of this application. Figure 2 ; Figure 4 for Figure 2 Enlarged view of part A in the diagram; Figure 5 This is a schematic diagram of the installation of the pipe fittings in the embodiments of this application.

[0018] The following are the labeling elements in the figure: 10 - Pipe fitting; 11 - Weld; 20 - Tube sheet; 110 - Mounting part; 111 - Absorption hole; 120 - Positioning shaft; 121 - Positioning block; 122 - Elastic element; 123 - Push rod; 130 - Cutting tool; 131 - Cutting disc; 140 - First drive assembly; 141 - Drive shaft; 142 - First bevel gear; 143 - Second bevel gear; 144 - First drive motor; 150-Elastic Shield; 160 - Second drive assembly; 161 - Second drive motor; 162 - Converter box; 170 - Limit switch. Detailed Implementation

[0019] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0020] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0021] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not 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 application.

[0022] Furthermore, the terms "first" and "second" 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" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0023] The pipe fitting weld cutting mechanism provided in the embodiments of this application will now be described. This pipe fitting weld cutting mechanism is used to extend into the interior of the pipe fitting 10 and cut the weld 11 of the pipe fitting 10, such as... Figure 5 As shown, the fitting 10 is welded to the tube sheet 20, and a weld 11 is formed at the connection between the fitting 10 and the tube sheet 20.

[0024] Specifically, please refer to the following: Figure 1 and Figure 2The pipe fitting weld cutting mechanism includes a mounting component 110, a positioning shaft 120, a cutting tool 130, and a first drive assembly 140. The positioning shaft 120 is fixed to the mounting component 110, and a plurality of positioning blocks 121 are provided at the end of the positioning shaft 120 away from the mounting component 110. The plurality of positioning blocks 121 are distributed along the circumferential direction of the positioning shaft 120. The positioning blocks 121 can reciprocate radially along the positioning shaft 120. The cutting tool 130 is sleeved on the positioning shaft 120, and the rotation axis of the cutting tool 130 is parallel to that of the positioning shaft 120. The axes of 0 coincide; the first drive assembly 140 is driven connected to the cutting tool 130 and is used to drive the cutting tool 130 to rotate; wherein, the positioning block 121 has a first state and a second state; in the first state, the positioning block 121 is close to the axis of the positioning shaft 120, and the positioning block 121 can move freely as the positioning shaft 120 extends into the pipe fitting 10; in the second state, the positioning block 121 is away from the axis of the positioning shaft 120, and the positioning block 121 is close to the inner wall of the pipe fitting 10 to fix the positioning shaft 120 inside the pipe fitting 10.

[0025] Compared with the prior art, the pipe fitting weld cutting mechanism provided in this application embodiment has a positioning block 121 that can move radially on the positioning shaft 120. When the positioning block 121 is inserted into the pipe fitting 10, it is in a first state close to the axis, which facilitates smooth entry into the pipe fitting 10. When it moves to the cutting position, the positioning block 121 switches to a second state away from the axis and is in close contact with the inner wall of the pipe fitting 10, thereby achieving stable fixation of the positioning shaft 120. Since the rotation axis of the cutting tool 130 coincides with the axis of the positioning shaft 120, when the positioning shaft 120 is fixed to the inner wall of the pipe fitting 10 by the positioning block 121, the rotation axis of the cutting tool 130 and the axis of the pipe fitting 10 are ensured to coincide. This effectively avoids cutting deviations caused by the shaking or eccentricity of the pipe fitting 10 during the cutting process, thereby significantly improving the cutting accuracy of the weld 11. The positioning of the pipe fitting weld cutting mechanism can be completed by the positioning shaft 120 and the positioning block 121, reducing the number of positioning devices. The overall size of the pipe fitting weld cutting mechanism is small and lightweight, making it easy to operate on site. At the same time, the two states of the positioning block 121 can be switched conveniently, which is applicable to pipe fittings 10 with different inner diameter specifications, enhancing the versatility and practicality of the mechanism.

[0026] In one embodiment of this application, please refer to the following: Figure 2 and Figure 4The positioning shaft 120 is provided with a guide hole, which is set along the axial direction of the positioning shaft 120. The positioning shaft 120 is provided with a plurality of hollow parts corresponding to the positioning blocks 121, and the hollow parts are connected to the guide hole. The positioning blocks 121 are movably set in the hollow parts one by one, and the side of the positioning block 121 facing the guide hole is inclined. Elastic members 122 are sleeved on the plurality of positioning blocks 121, and the elastic members 122 constrain the plurality of positioning blocks 121 on the positioning shaft 120. A push rod 123 is provided in the guide hole. The outer side of the push rod 123 is a conical surface, which cooperates with the inclined surface. The push rod 123 moves to drive the positioning blocks 121 to switch between the first state and the second state.

[0027] In this embodiment, when the push rod 123 moves along the guide hole toward the positioning block 121, the conical surface of the push rod 123 presses against the inclined surface of the positioning block 121, forcing the positioning block 121 to overcome the constraint force of the elastic element 122 and move radially outward, switching to the second state to press against the inner wall of the pipe fitting 10; when the push rod 123 moves in the opposite direction, the elastic restoring force of the elastic element 122 pulls the positioning block 121 radially inward, returning to the first state, so that the entire pipe fitting weld cutting mechanism can be removed from the pipe fitting 10. The elastic element 122 can be an annular rubber ring or multiple helical springs distributed along the circumference of the positioning shaft 120. By continuously applying an inward preload to the positioning block 121, it is ensured that the positioning block 121 can be stably maintained in the first state when not in operation, avoiding the positioning block 121 from accidentally extending due to vibration or other factors, which would affect the smooth insertion of the pipe fitting 10.

[0028] In another embodiment of this application, each positioning block 121 is provided with an elastic element, that is, one elastic element is provided on each positioning block 121, one end of the elastic element is connected to the positioning block 121, and the other end of the elastic element is connected to the positioning shaft. By providing multiple elastic elements, the reset process of each positioning block 121 can be more independent and stable, avoiding the impact of the failure of a single elastic element on the state switching of the overall positioning block 121. For example, when the elastic element corresponding to one of the positioning blocks 121 ages or is damaged, the other positioning blocks 121 can still be reset normally to the first state under the action of their respective elastic elements, thereby ensuring the reliability and safety of the pipe fitting weld cutting mechanism during use. Specifically, the elastic element can be a tension spring. When the positioning block 121 is in the second state, the tension spring is stretched and stores elastic potential energy; when the push rod 123 is retracted, the tension spring releases the potential energy and pulls the positioning block 121 to retract radially, ensuring that the positioning block 121 is accurately reset to the initial position.

[0029] In one embodiment of this application, please refer to the following: Figure 1 and Figure 2The pipe fitting weld cutting mechanism also includes a cutting disc 131, which is mounted on the positioning shaft 120 and connected to the first drive assembly 140. The cutting tool 130 is detachably mounted on the cutting disc 131.

[0030] In this embodiment, the cutting disc 131 provides a stable mounting base for the cutting blade 130. Simultaneously, through its connection with the first drive assembly 140, it efficiently transmits driving force to achieve the cutting action. The cutting blade 130 is detachable, allowing operators to quickly disassemble and replace it when it wears out or needs to be replaced according to different pipe fitting specifications 10, without requiring complex adjustments to the entire cutting mechanism. This significantly shortens maintenance time and improves the equipment's continuous operation capability.

[0031] Specifically, the cutting tool 130 is a shaped tool, customized to the corresponding shape according to the cutting method. This customized design can ensure that the contour of the tool and the weld 11 of the pipe fitting 10 are accurately matched. Whether it is a circumferential weld, a longitudinal weld or a weld of other special shapes, it can achieve a complete cut in one go, effectively avoiding problems such as incomplete cutting, burrs left on the workpiece surface or dimensional deviation caused by the mismatch of the shape of traditional general-purpose tools.

[0032] In one embodiment of this application, please refer to the following: Figure 2 and Figure 3 The first drive assembly 140 includes a drive shaft 141, a first bevel gear 142, a second bevel gear 143, and a first drive motor 144. The drive shaft 141 is coaxially sleeved on the positioning shaft 120 and rotatably connected to the mounting component 110. The cutting disc 131 is fixed on the drive shaft 141. The first bevel gear 142 is coaxially sleeved on one end of the drive shaft 141. The second bevel gear 143 is located on one side of the drive shaft 141 and extends in a direction perpendicular to the axis of the drive shaft 141, that is, the axis of the second bevel gear 143 is perpendicular to the axis of the drive shaft 141, and the second bevel gear 143 meshes with the first bevel gear 142. The first drive motor 144 is drivenly connected to the end of the second bevel gear 143 away from the first bevel gear 142. Its working principle is as follows: After the first drive motor 144 starts, its output shaft drives the second bevel gear 143 to rotate. Through bevel gear meshing, power is transmitted to the first bevel gear 142, which in turn drives the coaxially mounted transmission shaft 141 to rotate around the positioning shaft 120. Since the transmission shaft 141 is fixedly connected to the cutting disc 131, the cutting disc 131 rotates synchronously with the transmission shaft 141, ultimately driving the cutting tool 130 to achieve circumferential cutting motion. The bevel gear transmission structure features high transmission efficiency and smooth operation, converting the lateral space of the first drive motor 144 into axial rotational power for the cutting disc 131. This effectively reduces the radial dimension of the cutting mechanism in the pipe 10, making it more suitable for confined working environments.

[0033] Furthermore, the drive shaft 141 is rotatably connected to the mounting part 110 via a bearing, ensuring smooth rotation. Specifically, the outer ring of the bearing is fixedly connected to the mounting part 110, ensuring that the axis of the outer ring coincides with the axis of the positioning shaft 120, and the inner ring of the bearing is fixedly connected to the drive shaft 141. Thus, by setting the bearing, the axial and radial displacement of the drive shaft 141 can be precisely limited, ensuring that the rotation axis of the cutting tool 130 always coincides with the axis of the positioning shaft 120, further improving the cutting accuracy.

[0034] In this embodiment, firstly, the coaxial arrangement of the transmission shaft 141 and the positioning shaft 120 ensures the axial stability of the cutting disc 131 during rotation, effectively avoiding cutting deviations caused by different shafts and improving the cutting accuracy of the weld 11.

[0035] Secondly, the meshing transmission method of the first bevel gear 142 and the second bevel gear 143 can efficiently convert the output torque of the first drive motor 144 into the rotational power of the transmission shaft 141. At the same time, since the axis of the first bevel gear 142 is coaxial with the axis of the transmission shaft 141, and the axis of the second bevel gear 143 is perpendicular to the axis of the transmission shaft 141, and the drive end of the first drive motor 144 is connected to one end of the second bevel gear 143, a 90-degree turn in the power direction is achieved, which allows the installation position of the first drive motor 144 to be flexibly adjusted to better adapt to the overall layout requirements of the equipment.

[0036] Thirdly, the first drive motor 144 is directly connected to the second bevel gear 143, which reduces intermediate transmission links, reduces energy loss during power transmission, ensures the response speed and stability of the cutting disc 131 rotation, and thus improves the working efficiency and cutting quality consistency of the entire cutting mechanism.

[0037] In one embodiment of this application, please refer to the following: Figure 1 and Figure 2The pipe fitting weld cutting mechanism also includes an elastic guard 150, which is sleeved on the cutting disc 131 and the cutting tool 130. One end of the elastic guard 150 is connected to the mounting part 110. The inner diameter of the elastic guard 150 is larger than the outer diameter of the pipe fitting 10. The elastic guard 150 is used to prevent the cutting chips from splashing.

[0038] This embodiment is applied to a steam generator in a nuclear power plant. The pipe to be processed, 10, is a heat transfer pipe, such as... Figure 5 As shown, the heat transfer tube is installed on the tube sheet 20, and the free end of the elastic shield 150 abuts against the tube sheet 20, so that the processing area of ​​the cutting tool 130 forms a closed space, effectively preventing the processing chips generated during the cutting process from spreading to the external environment; by utilizing the elasticity of the elastic shield 150 itself, the free end of the elastic shield 150 can fit more closely to the tube sheet 20. Even if there are slight unevenness on the surface of the tube sheet 20 or there are installation errors between the mechanism and the tube sheet 20, a good seal can be achieved through elastic deformation to avoid chip leakage.

[0039] In one embodiment of this application, please refer to Figure 2 The mounting part 110 is provided with an absorption hole 111, which is connected to the cavity inside the elastic cover 150. The absorption hole 111 is used to connect an external suction device to collect the machining chips inside the elastic cover 150.

[0040] In this embodiment, the external suction device can extract the machining chips from the elastic protective cover 150 in real time through the absorption hole 111, preventing chips from accumulating in the confined space and affecting the normal operation of the cutting tool 130. It also prevents chips from scratching the inner wall of the pipe fitting 10 or adhering to the surface of the positioning block 121, ensuring smooth movement and positioning accuracy of the positioning block 121. The diameter of the absorption hole 111 can be designed according to the expected chip discharge rate, and its inlet end can be equipped with a funnel-shaped chip collection structure to expand the chip suction range and improve collection efficiency. In practical applications, the external suction device can be an industrial vacuum cleaner or a dedicated negative pressure system. By adjusting the suction strength, metal chips can be effectively removed without interfering with the cutting process due to excessive suction, achieving a clean and safe processing environment.

[0041] Specifically, a collection bag can also be installed at the absorption hole 111 to collect chips. The collection bag can be detachably installed at the outlet end of the absorption hole 111 via a snap-on or threaded connection. When the amount of chips in the collection bag reaches a certain level, the operator can quickly remove it and replace it with a new one, avoiding the tedious operation of frequently cleaning the inside of the suction device. The collection bag can be made of high-strength wear-resistant materials, such as nylon woven fabric or polyester fiber composite film, which can withstand the impact and friction of chips while preventing the leakage of fine particles. At the same time, its transparent bag design allows the operator to visually observe the chip filling status inside and replace it in time, ensuring the continuous and stable operation of the chip suction system.

[0042] In one embodiment of this application, please refer to Figure 1 The pipe fitting weld cutting mechanism also includes a second drive assembly 160, which is connected to the push rod 123 and is used to drive the push rod 123 to reciprocate.

[0043] In this embodiment, the second drive component enables automated control of the reciprocating movement of the push rod 123, eliminating the need for manual operation and improving the accuracy and efficiency of the state switching of the positioning block 121. This is particularly suitable for continuous cutting operations of batches of pipe fittings 10. By driving the push rod 123, the timing of the switching between the first and second states of the positioning block 121 can be stably controlled, ensuring that the positioning block 121 reliably retracts when the pipe fitting 10 is inserted and firmly abuts against the inner wall of the pipe fitting 10 at the cutting position. This avoids errors and instabilities that may be caused by manual operation, further ensuring the safety and stability of the cutting process.

[0044] In one embodiment of this application, please refer to the following: Figure 1 and Figure 2 The second drive assembly 160 includes a second drive motor 161 and a conversion box 162. The input end of the conversion box 162 is connected to the output end of the second drive motor 161, and the output end of the conversion box 162 is connected to the push rod 123. The conversion box 162 is used to convert the rotational motion of the second drive motor 161 into the linear motion of the push rod 123.

[0045] In this embodiment, the conversion box 162 can be equipped with a gear and rack mechanism, a ball screw pair, or a worm gear transmission structure to efficiently convert the rotary motion output by the second drive motor 161 into the linear motion required by the push rod 123. Taking the ball screw pair as an example, the screw in the conversion box 162 is connected to the output shaft of the second drive motor 161 through a coupling, and the nut is fixed to the push rod 123. When the second drive motor 161 drives the screw to rotate, the nut moves along the screw axis, thereby driving the push rod 123 to achieve reciprocating linear motion. This transmission method has the characteristics of high transmission accuracy, smooth operation, and fast response speed. It can accurately control the displacement of the push rod 123, thereby precisely adjusting the extension distance of the positioning block 121 to adapt to the positioning requirements of pipe fittings 10 with different inner diameters. At the same time, the conversion box 162 plays a sealing and protection role for the internal transmission components, effectively preventing external dust, chips, and other impurities from entering and affecting the transmission performance, and extending the service life of the second drive assembly 160.

[0046] In one embodiment of this application, please refer to the following: Figure 1 and Figure 2 A limit switch 170 is installed on the mounting component 110, and the limit switch 170 extends toward the positioning shaft 120 toward the pipe component 10.

[0047] In this embodiment, when the positioning shaft 120 drives the mechanism to extend into the pipe 10 and move to the preset cutting position, the limit switch 170 will be triggered. The trigger switch will send an electrical signal, which can be used to control the second drive component 160 to start, drive the push rod 123 to move so that the positioning block 121 switches to the second state to achieve positioning. At the same time, it can also be used as a trigger signal to start the cutting action, ensuring the accuracy of the cutting position.

[0048] Specifically, the limit switch 170 is equipped with an indicator light. When the limit switch 170 is triggered, the indicator light illuminates, providing the operator with a direct indication of the position. In actual operation, the trigger threshold of the limit switch 170 can be preset according to the length of different pipe fittings 10 and the position of the weld seam 11. By adjusting the installation position or built-in parameters of the limit switch 170 on the mounting component 110, precise control of the cutting position of pipe fittings 10 of different specifications can be achieved.

[0049] The working process of the pipe fitting weld cutting mechanism provided in this application embodiment is as follows: Align the positioning shaft 120 of the mechanism with the port of the pipe fitting 10. At this time, the positioning block 121 is in the first state, and the positioning shaft 120 smoothly extends into the pipe fitting 10. When the positioning shaft 120 moves to the cutting position and triggers the limit switch 170, the second drive assembly 160 drives the push rod 123 to move towards the positioning block 121. The conical surface of the push rod 123 presses against the inclined surface of the positioning block 121, forcing the positioning block 121 to overcome the constraint force of the elastic element 122 and move radially outward to the second state, tightly adhering to the inner wall of the pipe fitting 10 to fix the positioning shaft 120. Subsequently, the first drive assembly 140 is activated, driving the cutting disc 13 through the transmission shaft 141. 1. The cutting tool 130 rotates around the positioning shaft 120 to cut the weld 11 of the pipe fitting 10. During the cutting process, the elastic guard 150 abuts against the tube plate 20 outside the pipe fitting 10 to form a sealed space. The external suction device removes the generated chips in real time through the absorption hole 111 on the mounting part 110. After the cutting is completed, the first drive assembly 140 stops working, the second drive assembly 160 drives the push rod 123 to move in the opposite direction, and the elastic restoring force of the elastic element 122 pulls the positioning block 121 to move radially inward, returning to the first state. Finally, the entire cutting mechanism is removed from the pipe fitting 10 to complete one cutting operation.

[0050] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A pipe fitting weld seam cutting mechanism, used to extend into the interior of a pipe fitting and cut the weld seam of the pipe fitting, characterized in that, The pipe fitting weld cutting mechanism includes: Installation components; A positioning shaft is fixed to a mounting component. A plurality of positioning blocks are provided at the end of the positioning shaft away from the mounting component. The plurality of positioning blocks are distributed along the circumferential direction of the positioning shaft. The positioning blocks are capable of reciprocating along the radial direction of the positioning shaft. A cutting tool, wherein the cutting tool is sleeved on the positioning shaft, and the rotation axis of the cutting tool coincides with the axis of the positioning shaft; The first drive component is connected to the cutting tool drive and is used to drive the cutting tool to rotate; The positioning block has a first state and a second state. In the first state, the positioning block is close to the axis of the positioning shaft and can move freely as the positioning shaft extends into the pipe. In the second state, the positioning block is away from the axis of the positioning shaft and is in close contact with the inner wall of the pipe to fix the positioning shaft inside the pipe.

2. The pipe fitting weld cutting mechanism as described in claim 1, characterized in that, The positioning shaft is provided with a guide hole, which is arranged along the axial direction of the positioning shaft; the positioning shaft is provided with a plurality of hollow parts corresponding to the positioning blocks, and the hollow parts are connected to the guide holes; the positioning blocks are movably arranged in the hollow parts one by one, and the side of the positioning block facing the guide hole is inclined. A push rod is provided in the guide hole. The outer side of the push rod is a conical surface. The conical surface cooperates with the inclined surface. The push rod moves to drive the positioning block to switch between the first state and the second state.

3. The pipe fitting weld cutting mechanism as described in claim 1, characterized in that, An elastic element is fitted onto one or more of the positioning blocks, and the elastic element constrains the multiple positioning blocks onto the positioning shaft; or, Each of the positioning blocks is provided with an elastic element, one end of which is connected to the positioning block and the other end of which is connected to the positioning shaft.

4. The pipe fitting weld cutting mechanism as described in claim 1, characterized in that, The pipe fitting weld cutting mechanism also includes a cutting disc, which is sleeved on the positioning shaft and connected to the first drive assembly. The cutting tool is detachably mounted on the cutting disc.

5. The pipe fitting weld cutting mechanism as described in claim 4, characterized in that, The first driving component includes: A drive shaft is coaxially sleeved on the positioning shaft and rotatably connected to the mounting component; the cutting disc is fixed on the drive shaft. The first bevel gear is coaxially sleeved at one end of the transmission shaft; The second bevel gear is disposed on one side of the first bevel gear and extends in a direction perpendicular to the axis of the transmission shaft; the second bevel gear meshes with the first bevel gear. A first drive motor is connected to the end of the second bevel gear away from the first bevel gear.

6. The pipe fitting weld cutting mechanism as described in claim 4, characterized in that, The pipe fitting weld cutting mechanism also includes an elastic guard, which is fitted onto the cutting disc and the cutting tool. One end of the elastic guard is connected to the mounting component. The inner diameter of the elastic guard is larger than the outer diameter of the pipe fitting, and the elastic guard is used to prevent machining chips from splashing.

7. The pipe fitting weld cutting mechanism as described in claim 6, characterized in that, The mounting component is provided with an absorption hole, which communicates with the cavity inside the elastic shield. The absorption hole is used to connect an external suction device to collect the machining chips inside the elastic shield.

8. The pipe fitting weld cutting mechanism as described in claim 2, characterized in that, The pipe fitting weld cutting mechanism further includes a second drive assembly, which is connected to the push rod and is used to drive the push rod to reciprocate.

9. The pipe fitting weld cutting mechanism as described in claim 8, characterized in that, The second drive assembly includes a second drive motor and a conversion box, wherein the input end of the conversion box is connected to the output end of the second drive motor, and the output end of the conversion box is connected to the push rod; The conversion box is used to convert the rotational motion of the second drive motor into the linear motion of the push rod.

10. The pipe fitting weld cutting mechanism as described in any one of claims 1-9, characterized in that, A limit switch is installed on the mounting component, and the limit switch is oriented toward the positioning shaft extending toward the pipe component.

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