Reactor pipe joint weld cutting device

Abstract

The invention discloses a reactor pipe joint weld cutting device, which includes a shell, a positioning shaft, and a cutting tool; the central axis of the positioning shaft is coaxially arranged with the central axis of the reactor pipe joint, and the cutting tool is located at the circumferential periphery of the reactor pipe joint; the reactor pipe joint weld cutting device also includes a rotation drive mechanism for driving the cutting tool to rotate, a linear drive mechanism for driving the cutting tool to approach or move away from the pipe joint along the radial direction of the pipe joint, and a revolution drive mechanism for driving the shell to drive the cutting tool to rotate around the central axis of the positioning shaft; the rotation drive mechanism is arranged on the shell and connected to the cutting tool, the linear drive mechanism is arranged on the shell and connected to the rotation drive mechanism, and the revolution drive mechanism is connected to the shell. The reactor pipe joint weld cutting device of the invention can replace manual work to cut the reactor pipe joint weld, and avoid personnel approaching and absorbing too much nuclear radiation; it has a compact structure and can be adapted to move in a small space.

Description

Technical Field

[0001] The invention relates to the field of nuclear power equipment maintenance, and in particular to a reactor pipe joint weld cutting device. Background Art

[0002] In nuclear power equipment, all standard parts use a special fixing structure. The pipe joints used in the nuclear power industry are different from those used in conventional industries. Pipe joints include a joint nut body, a joint nut, and two anti-loosening washers. The long piece extending from the head of the anti-loosening washer is welded to the joint nut; the tail ring of the anti-loosening washer is welded to the joint nut body; when replacing the nut, the weld between the joint nut body and the anti-loosening washer needs to be cut to separate the joint nut body and the anti-loosening washer.

[0003] In the reactor equipment maintenance project, the thermocouple column needs to be replaced as a whole. Before the replacement, the 10 pipe joints connected to the thermocouple column need to be separated. The pipe joints are in an irradiated environment, which is extremely harmful to the human body. It is impossible to separate the pipe joints from the thermocouple column by cutting the welds using tools. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a reactor pipe joint weld cutting device.

[0005] The technical solution adopted by the present invention to solve the technical problem is: to provide a reactor pipe joint weld cutting device, the reactor pipe joint weld cutting device comprises a shell, a positioning shaft, and a cutting tool;

[0006] The central axis of the positioning shaft is coaxially arranged with the central axis of the reactor pipe joint, and the cutting tool is located at the circumferential periphery of the reactor pipe joint;

[0007] The reactor pipe joint weld cutting device also includes a rotation drive mechanism for driving the cutting tool to rotate, a linear drive mechanism for driving the cutting tool to approach or move away from the pipe joint along the radial direction of the pipe joint, and a revolution drive mechanism for driving the housing to drive the cutting tool to rotate around the central axis of the positioning shaft;

[0008] The rotation drive mechanism is arranged on the housing and connected to the cutting tool, the linear drive mechanism is arranged on the housing and connected to the rotation drive mechanism, and the revolution drive mechanism is connected to the housing.

[0009] Preferably, a first through hole for the reactor pipe joint to extend into is provided on one surface of the shell, and the positioning shaft is passed through the first through hole.

[0010] Preferably, the reactor pipe joint weld cutting device further comprises a tool quick-change plate for connecting to a robot arm, and the tool quick-change plate is connected to the shell.

[0011] Preferably, the self-rotation driving mechanism comprises a first motor and a high-speed shaft connected to each other, and the cutting tool is connected to one end of the high-speed shaft.

[0012] Preferably, the self-rotation drive mechanism further comprises a lifting plate connected to the linear drive mechanism, and the first motor and the high-speed shaft are located on the lifting plate.

[0013] Preferably, the self-rotation drive mechanism also includes a first transmission assembly connected between the first motor and the high-speed shaft, the lifting plate is provided with a second through hole for the first transmission assembly to pass through, the first motor is located above the second through hole, and the high-speed shaft is located below the second through hole.

[0014] Preferably, the linear drive mechanism comprises a cylinder, and a piston rod of the cylinder is connected to the lifting plate.

[0015] Preferably, the linear drive mechanism comprises a guide plate connected to a surface of the shell, a slide groove is provided in the guide plate, a guide member is protruding from a surface of the lifting plate, and the guide member is slidably fitted in the slide groove.

[0016] Preferably, the linear drive mechanism comprises a buffer, one end of the lifting plate is connected to a connecting plate perpendicular to the lifting plate, and the bottom of the connecting plate abuts against the buffer.

[0017] Preferably, the revolution driving mechanism comprises a second motor and a second transmission assembly for driving the housing to rotate around the positioning axis, and the second transmission assembly is connected between the second motor and the housing.

[0018] Preferably, the reactor pipe joint weld cutting device further comprises a camera connected to the shell and used for monitoring the cutting process.

[0019] Preferably, the reactor pipe joint weld cutting device further comprises a cutting debris collection box arranged on the shell.

[0020] The present invention has at least the following beneficial effects: the cutting tool cuts the weld of the reactor pipe joint positioned on the positioning shaft under the joint control of the rotation drive mechanism, the linear drive mechanism, and the revolution drive mechanism, which can replace manual work to complete the reactor pipe joint weld cutting work, avoid personnel cutting the weld at close range and absorbing too much nuclear radiation, and reduce the health risks of personnel in the cutting work. The rotation drive mechanism, the linear drive mechanism, and the revolution drive mechanism are integrated on the shell, so that the reactor pipe joint weld cutting device of the present invention has a compact structure and can be adapted to move and work in a small space. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0022] Figure 1 It is a schematic diagram of the structure of the reactor pipe joint from one perspective;

[0023] Figure 2 It is a structural schematic diagram of a reactor pipe joint weld cutting device according to an embodiment of the present invention from one viewing angle;

[0024] Figure 3 yes Figure 2 A magnified schematic diagram of part A;

[0025] Figure 4 is a longitudinal sectional view of a reactor pipe joint weld cutting device according to an embodiment of the present invention;

[0026] Figure 5 The figure is a schematic diagram of the internal structure of a reactor pipe joint weld cutting device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0028] The terms "first", "second", etc. are used only for descriptive purposes and should not be understood as indicating or implying relative importance or implicitly specifying the number of technical features.

[0029] like Figure 1 As shown, in the reactor upper support plate (not shown), a reactor pipe joint (hereinafter referred to as pipe joint) 3 is provided at the connection of each pipe section of the thermocouple conduit 30, and the pipe joint 3 includes a joint nut 31, a joint nut body 32, and a locking gasket 33. The two ends of the joint nut body 32 are respectively connected to the two pipe sections through the joint nut 31, and the locking gasket 33 is welded between the joint nut body 32 and the joint nut 31, so that the thermocouple conduit 30 has better overall sealing performance.

[0030] The thermocouple conduit extending from the thermocouple column (not shown) is connected to another section of the thermocouple conduit through the pipe joint 3. Therefore, when disassembling the thermocouple column, it involves the step of separating the thermocouple column from the pipe joint 3. In order to separate the thermocouple column from the pipe joint 3, it is necessary to cut the weld between the anti-loosening gasket 33 and the joint nut body 32.

[0031] Figure 2-4 The reactor pipe joint weld cutting device according to an embodiment of the present invention is shown. The reactor pipe joint weld cutting device comprises a shell 1, a positioning shaft 7, and a cutting tool 2;

[0032] The central axis of the positioning shaft 7 is coaxial with the central axis of the pipe joint 3, and the cutting tool 2 is located at the circumferential periphery of the pipe joint 3;

[0033] The reactor pipe joint weld cutting device also includes a rotation drive mechanism 4 for driving the cutting tool 2 to rotate, a linear drive mechanism 5 for driving the cutting tool 2 to approach or move away from the pipe joint 3 along the radial direction of the pipe joint 3, and a revolution drive mechanism 6 for driving the housing 1 to drive the cutting tool 2 to rotate around the central axis of the positioning shaft 7;

[0034] The rotation drive mechanism 4 is disposed on the housing 1 and connected to the cutting tool 2 , the linear drive mechanism 5 is disposed on the housing 1 and connected to the rotation drive mechanism 4 , and the revolution drive mechanism 6 is connected to the housing 1 .

[0035] Furthermore, in some embodiments, the reactor pipe joint weld cutting device further comprises a control system, which is respectively connected to the rotation drive mechanism 4, the linear drive mechanism 5, and the revolution drive mechanism 6. In this embodiment, the control system is a controller of an industrial robot, and the reactor pipe joint weld cutting device is connected to the mechanical arm of the industrial robot to realize process automation of the reactor pipe joint weld cutting device.

[0036] Specifically, Figure 1-4 As shown, the cutting tool 2 is a circular blade in this embodiment, and the cutting tool 2 is enclosed in a tool box 20, which contacts the pipe joint 3 to perform rotational cutting on it. Specifically, it can cut the weld between the joint nut body 32 and the anti-loosening gasket 33 on the pipe joint 3.

[0037] By controlling the self-rotation of the cutting tool 2, the linear motion of the cutting tool 2 approaching or moving away from the pipe joint 3 along the radial direction of the pipe joint 3, and the orbital motion of the cutting tool 2 around the pipe joint 3, the cutting work of the circumferential weld between the joint nut body 32 and the anti-loosening gasket 33 of the pipe joint 3 is completed.

[0038] During the rotation of the cutting tool 2, the cutting depth can be controlled by controlling the lifting and lowering of the cutting tool 2 relative to the pipe joint 3, and the circumferential weld between the anti-loosening gasket 33 and the joint nut body 32 can be cut by controlling the cutting tool 2 to revolve around the pipe joint 3, so as to separate the anti-loosening gasket 33 from the joint nut body 32.

[0039] The three movements (cutting blade rotation, cutting blade linear movement, and cutting blade revolution) have independent driving mechanisms respectively, so that the reactor pipe joint weld cutting device of the present invention can accurately control the cutting position and cutting depth, and has good working position stability.

[0040] The rotation drive mechanism 4, the linear drive mechanism 5, and the revolution drive mechanism 6 are integrated on the shell 1, so that the reactor pipe joint weld cutting device of the present invention has a compact structure and can be adapted to work in a relatively narrow space. For example, the pipe joint 3 of the thermocouple column is located in the upper support plate of the reactor (not shown). There are various densely distributed components in the upper support plate of the reactor, and the volume of the pipe joint 3 is relatively small compared to other components. The reactor pipe joint weld cutting device of the present invention has a compact structure and occupies a small volume, so it is easy to move in the upper support plate of the reactor and pass through obstacles to position and cut the pipe joint 3.

[0041] A first through hole 10 for the pipe joint 3 to extend into is provided on one surface of the housing 1, and the positioning shaft 7 is passed through the first through hole 10. Specifically, during operation, the first through hole 10 is aligned with the pipe joint 3, so that the pipe joint 3 extends into the first through hole 10.

[0042] In some embodiments, one end of the positioning shaft 7 close to the pipe joint 3 has a bayonet (not shown) for sleeve-fitting the outer peripheral surface of the end of the pipe joint 3 , and the end of the pipe joint 3 is inserted into the through hole 10 and fixed to the positioning shaft 7 through the bayonet.

[0043] In some embodiments, the reactor pipe joint weld cutting device further comprises a tool quick-change plate 9 for connecting to the robot arm, and the tool quick-change plate 9 is connected to the housing 1. The tool quick-change plate 9 is connected to the revolution drive mechanism 6 through a hollow frame 90. The electrical cables of the rotation drive mechanism 4, the linear drive mechanism 5, the revolution drive mechanism 6, etc. are connected to the control system (not shown) of the industrial robot through the frame 90 and the tool quick-change plate 9.

[0044] The tool quick-change plate 9 corresponds to the standard interface at the end of the robotic arm. Through the tool quick-change plate 9, the other components of the reactor pipe joint weld cutting device can be connected to the robotic arm of the matching industrial robot, so that the movement of the reactor pipe joint weld cutting device has more degrees of freedom, and the automation of the pipe joint 3 weld cutting work can be realized to free up manpower and improve work efficiency.

[0045] In some embodiments, the self-rotation drive mechanism 4 includes a first motor 40 and a high-speed shaft 41 connected to each other, and the cutting tool 2 is connected to one end of the high-speed shaft 41. The first motor 40 drives the high-speed shaft 41 to drive the cutting tool 2 to perform self-rotation.

[0046] Furthermore, in some embodiments, the rotation drive mechanism 4 may further include a lifting plate 42 connected to the linear drive mechanism, and the first motor 40 and the high-speed shaft 41 are disposed on the lifting plate 42 .

[0047] Specifically, as shown in the figure, a bearing seat (not shown) is fixedly connected to the lower side of the lifting plate 42, a bearing 43 is arranged in the bearing seat, and the high-speed shaft 41 is connected to the bearing 43 to improve its rotation accuracy. The first motor 40 is arranged on the upper side of the lifting plate 42.

[0048] The lifting plate 42 is connected to the linear drive mechanism. The rotation drive mechanism 4 can be lifted and lowered under the drive of the linear drive mechanism to control the cutting depth of the cutting tool 2 when cutting the weld on the pipe joint 3 .

[0049] Furthermore, in some embodiments, the self-rotation drive mechanism 4 may also include a first transmission assembly 44 connected between the first motor 40 and the high-speed shaft 41, the lifting plate 42 is provided with a second through hole (not shown) for the first transmission assembly 44 to pass through, the first motor 40 is located above the second through hole, and the high-speed shaft 41 is located below the second through hole.

[0050] Specifically, the first transmission assembly 44 is a gear set in this embodiment, which passes through the second through hole on the lifting plate 42 and is respectively connected to the first motor 40 on the upper side of the lifting plate 42 and the high-speed shaft 41 on the lower side of the lifting plate 42. Such an arrangement makes the lifting plate 42 more balanced in force and has better stability during lifting and lowering motion.

[0051] In some embodiments, the linear drive mechanism 5 includes a cylinder 50 , and a piston rod of the cylinder 50 is connected to the lifting plate 42 .

[0052] Furthermore, in some embodiments, Figure 2 As shown, the linear drive mechanism 5 may also include a guide plate 51 connected to a surface of the housing 1, a slide groove (not shown) is provided in the guide plate 51, and a guide member 420 is protruding from a surface of the lifting plate 42, and the guide member 420 is slidably fitted in the slide groove. The guide plate 51 can provide a linear guide for the lifting and lowering movement of the lifting plate 42, thereby improving its position stability during the lifting and lowering movement.

[0053] Furthermore, in some embodiments, Figure 2 As shown, the linear drive mechanism 5 may further include a buffer 52 , one end of the lifting plate 42 is connected to a connecting plate 421 perpendicular to the lifting plate 42 , and the bottom of the connecting plate 421 abuts against the buffer 52 .

[0054] Specifically, the buffer 52 is connected to the housing 1 through the mounting frame 520. When the lifting plate 42 is lifted or lowered, the bottom of the connecting plate 421 abuts against the buffer 52 to provide buffering and deceleration for the lifting motion of the lifting plate 42 until the motion stops, thereby improving the position stability of the self-rotation drive mechanism 4 thereon. The buffer 52 can be an elastic component such as a spring.

[0055] In some embodiments, the revolution driving mechanism 6 may include a second motor 60 for driving the housing 1 to rotate around the positioning axis 7 and a second transmission assembly 61 , wherein the second transmission assembly 61 is connected between the second motor 60 and the housing 1 .

[0056] Specifically, the second transmission assembly 61 is a gear pair in this embodiment. It can be understood that in other embodiments, other types of second transmission assemblies 61 can also be provided according to specific circumstances.

[0057] Furthermore, in some embodiments, a support bearing 71 connected between the housing 1 and the positioning shaft 7 may be disposed in the first through hole 10 to increase the rotation accuracy of the housing 1 around the positioning shaft 7 .

[0058] In some embodiments, the reactor pipe joint weld cutting device further includes a camera 8 connected to the shell 1 , and the camera 8 is arranged toward the pipe joint 3 extending into the first through hole 10 .

[0059] Specifically, a camera mounting bracket 81 is mounted on one surface of the housing 1, and the camera 8 is connected to the housing 1 via the camera mounting bracket 81. Figure 3 As shown, the camera 8 has a field of view 80, and the specific position of the camera 8 on the housing 1 can be appropriately adjusted to obtain the most suitable field of view 80. The camera 8 can be connected to the control system of the industrial robot or other control systems, and can be used to provide real-time feedback of images of the process of cutting the weld of the pipe joint 3.

[0060] Considering that flying chips are generated when cutting the weld of the pipe joint 3, in some embodiments, the reactor pipe joint weld cutting device also includes a cutting chip collection box (not shown) arranged on the shell 1 and used to collect flying chips generated by cutting, and the opening of the cutting chip collection box can be arranged toward the internal cavity of the shell 1.

[0061] Specifically, in some embodiments, when the pipe joint 3 extends into the first through hole 10 on the shell 1, the flying chips generated by the cutting process are enclosed in the shell 1 and collected by the cutting chip collection box, so as to prevent the cutting chips from splashing outward and causing adverse effects on other surrounding equipment (such as reactor internal components with high requirements for foreign matter control).

[0062] The above are only some specific embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A reactor pipe joint weld cutting device, characterized in that: The reactor pipe joint weld cutting device comprises a shell (1), a positioning shaft (7), and a cutting tool (2); The central axis of the positioning shaft (7) is coaxially arranged with the central axis of the reactor pipe joint (3), and the cutting tool (2) is located on the circumferential periphery of the reactor pipe joint (3); The reactor pipe joint weld cutting device further comprises a rotation drive mechanism (4) for driving the cutting tool (2) to rotate, a linear drive mechanism (5) for driving the cutting tool to approach or move away from the pipe joint along the radial direction of the pipe joint, and a revolution drive mechanism (6) for driving the housing (1) to drive the cutting tool (2) to rotate around the central axis of the positioning shaft (7); The rotation drive mechanism (4) is arranged on the housing (1) and connected to the cutting tool (2); the linear drive mechanism (5) is arranged on the housing (1) and connected to the rotation drive mechanism (4); and the revolution drive mechanism (6) is connected to the housing (1); The self-rotation driving mechanism (4) comprises a first motor (40) and a high-speed shaft (41) which are connected to each other, and the cutting tool (2) is connected to one end of the high-speed shaft (41); The self-rotation drive mechanism (4) further comprises a lifting plate (42) connected to the linear drive mechanism (5), and the first motor (40) and the high-speed shaft (41) are located on the lifting plate (42).

2. The reactor pipe joint weld cutting device according to claim 1, characterized in that: A first through hole (10) for the reactor pipe joint (3) to extend into is provided on one surface of the shell, and the positioning shaft (7) is inserted into the first through hole (10).

3. The reactor pipe joint weld cutting device according to claim 1, characterized in that: The reactor pipe joint weld cutting device further comprises a tool quick-change plate (9) for connecting to a mechanical arm, wherein the tool quick-change plate (9) is connected to the shell (1).

4. The reactor pipe joint weld cutting device according to claim 1, characterized in that: The self-rotation drive mechanism (4) further comprises a first transmission assembly (44) connected between the first motor (40) and the high-speed shaft (41); the lifting plate (42) is provided with a second through hole for the first transmission assembly (44) to pass through; the first motor (40) is located above the second through hole; and the high-speed shaft (41) is located below the second through hole.

5. The reactor pipe joint weld cutting device according to claim 1, characterized in that: The linear drive mechanism (5) comprises a cylinder (50), and a piston rod of the cylinder (50) is connected to the lifting plate (42).

6. The reactor pipe joint weld cutting device according to claim 1, characterized in that: The linear drive mechanism (5) comprises a guide plate (51) connected to a surface of the housing (1), a slide groove being provided in the guide plate (51), and a guide member (420) protruding from a surface of the lifting plate (42), the guide member (420) being slidably fitted in the slide groove.

7. The reactor pipe joint weld cutting device according to claim 1, characterized in that: The linear drive mechanism (5) comprises a buffer member (52); one end of the lifting plate (42) is connected to a connecting plate (421) perpendicular to the lifting plate (42); and the bottom of the connecting plate (421) abuts against the buffer member (52).

8. The reactor pipe joint weld cutting device according to claim 2, characterized in that: The revolution drive mechanism (6) comprises a second motor (60) for driving the housing (1) to rotate around the positioning axis (7) and a second transmission assembly (61), wherein the second transmission assembly (61) is connected between the second motor (60) and the housing (1).

9. The reactor pipe joint weld cutting device according to any one of claims 1 to 8, characterized in that: The reactor pipe joint weld cutting device further comprises a camera (8) connected to the shell (1) and used for monitoring the cutting process.

10. The reactor pipe joint weld cutting device according to any one of claims 1 to 8, characterized in that: The reactor pipe joint weld cutting device further comprises a cutting debris collection box arranged on the shell (1).

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