Welding device for on-line replacement of radiation-resistant valve guide rail

Abstract

The invention belongs to the technical field of on-line maintenance of radiation-resistant valves of nuclear power plants, and particularly relates to a welding device for on-line replacement of a radiation-resistant valve guide rail. Comprising an adaptive bottom plate, the adaptive bottom plate is installed on a valve port of a valve body, a guide rail positioning block is fixed to one end of the adaptive bottom plate, a lifting base is connected with the adaptive bottom plate, a lifting module is placed on the adaptive bottom plate and installed on the lifting base, a lifting plate is installed on the lifting module, and a lifting screw is connected with the lifting plate. The radial module is fixed to the sliding block of the lifting module through a radial connecting plate, the axial module is fixed to the sliding block of the radial module through an axial connecting plate, and the rotating device is fixed to the sliding block of the axial module. The welding device has the beneficial effects that the structure is simple, and welding operation can be completed only through one-time installation; welding operation can be carried out remotely; the welding process can be monitored in real time; the radiation resistance is realized; the device is suitable for narrow spaces.

Description

Technical Field

[0001] The present invention belongs to the technical field of on-line maintenance of radiation-resistant valves in nuclear power plants, and particularly relates to a welding device for on-line replacement of guide rails of radiation-resistant valves. Background Art

[0002] As Figure 1 For the radiation-resistant valve shown, the radiation-resistant valve includes a valve body, a valve seat and a guide rail. Among them, the valve seat cooperates with the valve flap of the valve to control the flow of radioactive media such as steam and water. When serious defects appear on the sealing surface of the valve seat, it is necessary to repair the valve seat of the valve on-line. In actual working conditions, the distance between the guide rails of some gate valves is smaller than the outer diameter of the valve seat, and the valve seat cannot be taken out of the valve cavity after being cut. Therefore, before repairing the valve seat, it is necessary to cut off the guide rail first. After the repair of the new valve seat is completed, the new guide rail is welded to the valve body.

[0003] Due to the narrow internal space of the valve body, it is difficult to perform manual welding operations, and the radiation dose received by personnel is high. Therefore, it is necessary to develop a special device to realize on-line welding of the valve guide rail through remote control, so as to reduce the equipment repair cost and the radiation dose received by the operator. At present, for the problem of welding the valve guide rail, although the solutions in the prior art can complete the basic function of guide rail welding, the following problems still exist in actual applications:

[0004] The degree of welding automation is insufficient. When the existing device welds the welds on both sides of a single guide rail, manual intervention is still required to perform the operation of switching the welding torch station, resulting in the interruption of welding continuity; the efficiency of a single welding operation is low. The existing device can only complete the welding operation of a single guide rail each time. When it is necessary to weld another guide rail, the entire set of equipment must be removed and reinstalled on the other side of the valve seat before continuing the operation. Summary of the Invention

[0005] The purpose of the present invention is to provide a welding device for on-line replacement of guide rails of radiation-resistant valves, which can realize on-line welding of valve guide rails through remote control, so as to reduce the equipment repair cost and the radiation dose received by the operator.

[0006] The technical solution of the present invention is as follows: A welding device for on-line replacement of a radiation-resistant valve guide rail, including a lifting module, a lifting plate, lifting screws, a radial connecting plate, a radial module, an axial module, a camera assembly, a slewing device, a guide rail positioning block, an adapter bottom plate, a remote control console, pipelines, a control cabinet, a welding power source, an argon supply unit, a wire feeder, a lifting base, and an axial connecting plate. The adapter bottom plate is installed on the valve port of the valve body. The guide rail positioning block is fixed at one end of the adapter bottom plate. The lifting base is connected to the adapter bottom plate. The lifting module is placed on the adapter bottom plate and installed on the lifting base. The lifting plate is installed on the lifting module. The lifting screws are connected to the lifting plate. The radial module is fixed to the slider of the lifting module through the radial connecting plate. The axial module is fixed to the slider of the radial module through the axial connecting plate. The slewing device is fixed to the slider of the axial module.

[0007] The adapter bottom plate is matched with the flange stop of the valve body for positioning the welding device.

[0008] The guide rail positioning block is matched with the guide rail for circumferential positioning of the welding device.

[0009] The lifting module drives the slewing device to move up and down. The radial module drives the slewing device to move radially along the valve body, facilitating the welding of the guide rails on both sides of the valve body. The axial module drives the slewing device to move axially along the valve body, facilitating the welding of the welds on both sides of the guide rail.

[0010] The slewing device includes a welding connecting plate, a welding torch fixing block, a welding torch, a slewing connecting plate, a cable support plate, a locking nut, a coupling, a stepping motor, a motor flange, a motor base, and a rotating rod. The motor base is connected to the slewing connecting plate. The motor flange is installed on the motor base. The stepping motor is installed on the motor flange. The rotating rod is connected to the motor base. The locking nut is connected to the rotating rod for axial fixation of the rotating rod. The stepping motor provides power. The rotating rod is connected to the output shaft of the stepping motor through the coupling. The welding torch is pressed on the welding connecting plate through the welding torch fixing block. The camera assembly is fixed on the rotating rod. The welding torch makes a rotating motion by the power provided by the stepping motor. The camera assembly rotates synchronously with the welding torch.

[0011] The camera assembly collects welding images in real time and transmits them to the remote control console. The remote control console monitors the welding state in real time and adjusts the position of the welding torch in real time through the lifting module, the radial module, the axial module, and the slewing device. At the same time, it adjusts the control cabinet, the welding power source, and the wire feeder in real time to jointly ensure the welding quality.

[0012] The welding torch is fixed through the welding torch fixing block. The integrated cable of the welding torch passes through the hollow part of the rotating rod, and the integrated cable passes through the cable support plate.

[0013] The welding torch is a narrow-gap welding torch, which is convenient for welding the valve guide rail weld.

[0014] The lifting screw is used for the handling of the welding device.

[0015] The pipeline includes communication cables, drive motor cables, argon hoses, control cables, network cables and integrated cables. The argon supply unit and the wire feeder are connected by the argon hose. The wire feeder is connected to the control cabinet and the welding power supply through the control cable. The camera assembly is connected to the control cabinet and the welding power supply through the network cable. The wire feeder is connected to the control cabinet and the welding power supply through the control cable. The drive motors of the lifting module, the radial module, the axial module and the slewing device are connected to the control cabinet and the welding power supply through the drive motor cable. The remote console is connected to the control cabinet and the welding power supply through the communication cable to realize the remote control of the welding device by the remote console.

[0016] The beneficial effects of the present invention are as follows: The structure of the present invention is simple, and the welding operation can be completed only by one installation; the welding operation can be remotely carried out; the welding process can be monitored in real time; it is radiation-resistant; and it is suitable for narrow spaces.

[0017] A welding device for online replacement of radiation-resistant valve guide rails provided by the present invention realizes the automation of valve guide rail welding. Through the coordinated movement of the lifting module, the axial module, the radial module and the slewing device, the autonomous switching of multi-station welding is realized, and the operation intensity and technical threshold of operators are significantly reduced.

[0018] A welding device for online replacement of radiation-resistant valve guide rails provided by the present invention can realize the welding of the welds of two guide rails of the valve seat through a single installation, completely eliminating the non-value-added operation time caused by equipment disassembly and assembly in the prior art, and improving the overall welding efficiency. Brief Description of the Drawings

[0019] Figure 1 is a cross-sectional view of a radiation-resistant valve;

[0020] Figure 2 is a three-dimensional schematic diagram of a welding device for online replacement of radiation-resistant valve guide rails provided by the present invention;

[0021] Figure 3 is a top view of a welding device for online replacement of radiation-resistant valve guide rails provided by the present invention;

[0022] Figure 4 is a structural schematic diagram of the slewing device;

[0023] Figure 5 is a working position diagram of the camera assembly and the slewing assembly.

[0024] In the figure: 1 valve body, 2 guide rail, 3 valve seat, 4 lifting module, 5 lifting plate, 6 lifting screw, 7 radial connecting plate, 8 radial module, 9 axial module, 10 camera assembly, 11 slewing device, 12 guide rail positioning block, 13 adapter base plate, 14 remote control console, 15 pipeline, 16 control cabinet and welding power source, 17 argon supply unit, 18 wire feeder, 19 lifting base, 20 axial connecting plate, 111 welding connecting plate, 112 welding torch fixing block, 113 welding torch, 114 slewing connecting plate, 115 cable support plate, 116 locking nut, 117 coupling, 118 slewing motor, 119 motor flange, 1110 motor base, 1111 rotating rod, 151 communication cable, 152 drive motor cable, 153 argon hose, 154 control cable, 155 network cable, 156 integrated cable. Detailed implementation mode

[0025] Hereinafter, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art.

[0026] As Figure 2 shown, a welding device for on-line replacement of a radiation-resistant valve guide rail provided by the present invention includes: a lifting module 4, a lifting plate 5, a lifting screw 6, a radial connecting plate 7, a radial module 8, an axial module 9, a camera assembly 10, a slewing device 11, a guide rail positioning block 12, an adapter base plate 13, a remote control console 14, a pipeline 15, a control cabinet and a welding power source 16, an argon supply unit 17, a wire feeder 18, a lifting base 19, and an axial connecting plate 20. The adapter base plate 13 is installed on the valve port of the valve body through fasteners. The guide rail positioning block 12 is fixed to one end of the adapter base plate 13 by screws. The lifting base 19 is connected to the adapter base plate 13 by screws. The lifting module 4 is vertically placed on the adapter base plate 13 and installed on the lifting base 19 by screws. The lifting plate 5 is installed on the lifting module 4 by screws. The lifting screw 6 is threadedly connected to the lifting plate 5. The radial module 8 is fixed to the slider of the lifting module 4 through the radial connecting plate 7. The axial module 9 is fixed to the slider of the radial module 8 through the axial connecting plate 20. The slewing device 11 is fixed to the slider of the axial module 9 by screws.

[0027] Specifically, the adapter base plate 13 cooperates with the valve body flange stop for positioning the welding device.

[0028] Specifically, the guide rail positioning block 12 cooperates with the guide rail and is used for the circumferential positioning of the welding device.

[0029] Specifically, the lifting module 4 drives the slewing device 11 to move up and down, and the radial module 8 drives the slewing device 11 to move radially along the valve body 1, facilitating the welding of the guide rails 2 on both sides of the valve body 1. The axial module 9 drives the slewing device 11 to move axially along the valve body 1, facilitating the welding of the welds on both sides of the guide rail 2.

[0030] Specifically, the slewing device 11 includes: a welding connecting plate 111, a welding torch fixing block 112, a welding torch 113, a slewing connecting plate 114, a cable support plate 115, a locking nut 116, a coupling 117, a stepping motor 118, a motor flange 119, a motor base 1110, and a rotating rod 1111. The motor base 1110 is connected to the slewing connecting plate 114 by screws. The motor flange 119 is installed on the motor base 1110, and the stepping motor 118 is installed on the motor flange 119. The rotating rod 1111 is connected to the motor base 1110 by angular contact ball bearings to ensure the rotation accuracy of the rotating rod 1111. The locking nut 116 is threadedly connected to the rotating rod 1111 for the axial fixation of the rotating rod 1111. The stepping motor 118 provides power. The rotating rod 1111 is connected to the output shaft of the stepping motor 118 through the coupling 117, and a flat key is used to ensure the repeat positioning accuracy of the rotating rod 1111. The welding torch 113 is pressed on the welding connecting plate 111 through the welding torch fixing block 112. The camera assembly 10 is fixed to the rotating rod 1111 by screws. The welding torch 113 makes a rotating motion powered by the stepping motor 118, and at the same time, the camera assembly 10 rotates synchronously with the welding torch 113.

[0031] Specifically, the camera assembly 10 collects welding images in real time and transmits them to the remote control console 14. The remote control console 14 monitors the welding state in real time and adjusts the position of the welding torch 113 in real time through the lifting module 4, the radial module 8, the axial module 9, and the slewing device 11. At the same time, the control cabinet, the welding power source 16, and the wire feeder 18 are adjusted in real time to jointly ensure the welding quality.

[0032] Specifically, the welding torch 113 is fixed through the welding torch fixing block 112. The integrated cable of the welding torch 113 passes through the hollow part of the rotating rod 1111 to avoid the integrated cable blocking the field of view of the camera assembly 10. Further, the integrated cable passes through the cable support plate 115 to prevent the wire feeding from being affected due to the too small bending radius of the integrated cable.

[0033] Specifically, the welding torch 113 is a narrow-gap welding torch, which is convenient for welding the valve guide rail welds.

[0034] Specifically, the lifting screw 6 is used for the handling of the welding device.

[0035] Specifically, the pipeline 15 includes a communication cable 151, a drive motor cable 152, an argon hose 153, a control cable 154, a network cable 155, and an integrated cable 156. The argon supply unit 17 and the wire feeder 18 are connected by the argon hose 153. The wire feeder 18 and the control cabinet and the welding power source 16 are connected by the control cable 154. The camera assembly 10 and the control cabinet and the welding power source 16 are connected by a network cable. The wire feeder 18 and the control cabinet and the welding power source 16 are connected by the control cable 154. The drive motors of the lifting module 4, the radial module 8, the axial module 9, and the slewing device 11 are connected to the control cabinet and the welding power source 16 by the drive motor cable 152. The remote control console 154 and the control cabinet and the welding power source 16 are connected by the communication cable 151 to realize the remote control of the welding device by the remote control console 154.

[0036] When the present invention is in use, the welding device is carried by the lifting screw 6 to make the adapter bottom plate fit the flange surface of the valve body 1. At the same time, the positioning stop of the guide rail positioning block 12 is attached to one side of the guide rail for positioning the welding device, and then fixed with fasteners. The operator adjusts the lifting module 4, the radial module 8, the axial module 9, and the slewing device 11 through the camera assembly 10 to align the welding torch with the weld on one side of the guide rail for welding. Then, the position of the welding torch is adjusted by the lifting module 4 and the slewing device 11 to align it with the weld on the other side of the guide rail for welding. The guide rail 2 and the valve body 1 are connected by intermittent fillet welding. Repeat the above steps to complete the welding of one side of the guide rail. As Figure 5 shown, first weld one side of the guide rail, and after the welding is completed, move the welding torch to the other side for welding.

[0037] The above specific embodiments are only used to explain the design concept of the present invention, and their function is to facilitate the understanding and implementation of those skilled in the relevant art, rather than to limit the scope of the patent protection of the present invention. Therefore, any equivalent changes made using the design concept of the present invention still fall within the protection scope of the present invention.

Claims

1. A welding device for on-line replacement of an irradiation-resistant valve guide rail, characterized in that: It includes a lifting module, a lifting plate, lifting screws, a radial connecting plate, a radial module, an axial module, a camera assembly, a slewing device, a guide rail positioning block, an adapter base plate, a remote control console, pipelines, a control cabinet, a welding power source, an argon supply unit, a wire feeder, a lifting base, and an axial connecting plate. The adapter base plate is installed on the valve port of the valve body. The guide rail positioning block is fixed at one end of the adapter base plate. The lifting base is connected to the adapter base plate. The lifting module is placed on the adapter base plate and installed on the lifting base. The lifting plate is installed on the lifting module. The lifting screws are connected to the lifting plate. The radial module is fixed to the slider of the lifting module through the radial connecting plate. The axial module is fixed to the slider of the radial module through the axial connecting plate. The slewing device is fixed to the slider of the axial module.

2. The welding device for on-line replacement of a radiation-resistant valve guide rail according to claim 1, characterized in that: The adapter base plate mates with the valve body flange stop to position the welding device.

3. The welding device for on-line replacement of a radiation-resistant valve guide rail according to claim 1, characterized in that: The guide rail positioning block mates with the guide rail for circumferential positioning of the welding device.

4. A welding device for on-line replacement of a radiation-resistant valve guide rail according to claim 1, characterized in that: The lifting module drives the slewing device to move up and down, and the radial module drives the slewing device to move radially along the valve body, facilitating the welding of the guide rails on both sides of the valve body. The axial module drives the slewing device to move axially along the valve body, facilitating the welding of the welds on both sides of the guide rail.

5. A welding device for on-line replacement of a radiation-resistant valve guide rail according to claim 1, characterized in that: The slewing device includes a welding connecting plate, a welding torch fixing block, a welding torch, a slewing connecting plate, a cable support plate, a locking nut, a coupling, a stepping motor, a motor flange, a motor base, and a rotating rod. The motor base is connected to the slewing connecting plate. The motor flange is installed on the motor base. The stepping motor is installed on the motor flange. The rotating rod is connected to the motor base. The locking nut is connected to the rotating rod for axial fixation of the rotating rod. The stepping motor provides power. The rotating rod is connected to the output shaft of the stepping motor through the coupling. The welding torch is pressed against the welding connecting plate through the welding torch fixing block. The camera assembly is fixed to the rotating rod. The welding torch makes a rotational movement powered by the stepping motor, and the camera assembly rotates synchronously with the welding torch.

6. The welding device for on-line replacement of the radiation-resistant valve guide rail according to claim 1, characterized in that: The camera assembly collects welding images in real time and transmits them to the remote control console. The remote control console monitors the welding status in real time and adjusts the position of the welding torch in real time through the lifting module, the radial module, the axial module, and the slewing device. At the same time, it adjusts the control cabinet, the welding power source, and the wire feeder in real time to jointly ensure the welding quality.

7. The welding device for on-line replacement of the radiation-resistant valve guide rail according to claim 1, characterized in that: The welding torch is fixed through the welding torch fixing block. The integrated cable of the welding torch passes through the hollow part of the rotating rod and through the cable support plate.

8. The welding device for on-line replacement of a radiation-resistant valve guide rail according to claim 1, wherein: The welding torch is a narrow-gap welding torch, which is convenient for welding the valve guide rail welds.

9. The welding device for on-line replacement of the radiation-resistant valve guide rail according to claim 1, characterized in that: The lifting screws are used for the handling of the welding device.

10. A welding device for on-line replacement of a radiation-resistant valve guide rail according to claim 1, characterized in that: The pipeline includes communication cables, drive motor cables, argon hoses, control cables, network cables, and integrated cables. The argon supply unit and the wire feeder are connected using the argon hose. The wire feeder is connected to the control cabinet and the welding power source through the control cable. The camera assembly is connected to the control cabinet and the welding power source through the network cable. The wire feeder is connected to the control cabinet and the welding power source through the control cable. The drive motors of the lifting module, radial module, axial module, and rotary device are connected to the control cabinet and the welding power source through the drive motor cables. The remote console is connected to the control cabinet and the welding power source through the communication cable, realizing remote control of the welding device by the remote console.

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