A rolling device for nuclear power control rod weld seam and a rolling method thereof

Abstract

This application provides a rolling device and method for the weld seam of control rods used in nuclear power plants. The rolling device includes a chuck seat, a pneumatic chuck, a rolling component, a positioning component, and a support platform. The rolling component contains a cylinder, a pressure roller, a guide sleeve, and a support roller. The positioning component includes a positioning stop. During operation, the control rod is passed through the pneumatic chuck and guide sleeve until it is in close contact with the positioning stop. The position of the positioning stop is adjusted to the central protrusion of the pressure roller and support roller. The pneumatic chuck clamps the control rod and rotates it, causing the weld seam of the control rod to rotate between the pressure roller and support roller. The cylinder drives the pressure roller to press the weld seam and applies pressure to the weld seam to complete the weld rolling. This application solves the problem of large weld seam allowance of control rods by adopting a mechanical structure design and using a clamping and rotating method for rod rolling.

Description

Technical Field

[0001] This application belongs to the field of control rod weld rolling technology, specifically relating to a rolling device and rolling method for control rod welds used in nuclear power plants. Background Technology

[0002] In nuclear power plants, control rod end plugs for components such as nuclear fuel assemblies are typically welded using TIG (Tungsten Inert Gas Welding). Due to the heat-affected zone (HAZ) after welding, some welds have large diameters that cannot pass ring gauge inspection, preventing free insertion into the guide tube. Welds with large excess weld height are generally treated with mechanical removal, including cutting and grinding. However, because control rods are thin-walled tube end plugs, the removed material has a significant impact on the weld; therefore, mechanical removal is avoided unless absolutely necessary. While process parameter control can keep the weld diameter within the required technical range, the special properties of the material can easily lead to incomplete penetration defects. Summary of the Invention

[0003] In view of this, the embodiments of this application are committed to providing a rolling device and rolling method for the control rod weld of nuclear power plants. By adopting a mechanical structure design and using a clamping and rotating method to roll the rod, the problem of large weld reinforcement of the control rod is solved.

[0004] The first aspect of this application provides a rolling device for the weld seam of a control rod used in nuclear power plants. The rolling device includes a chuck seat, a pneumatic chuck, a rolling component, a positioning component, and a support platform. The chuck seat and the rolling component are mounted on the support platform. The pneumatic chuck is mounted on the chuck seat and located between the chuck seat and the rolling component. The positioning component is located on the side of the rolling component opposite to the pneumatic chuck and is mounted on the rolling component. The rolling component contains a cylinder, a pressure roller, a guide sleeve, and a support roller. The positioning component includes a positioning stop. During operation, the control rod is passed through the pneumatic chuck and guide sleeve until it is in close contact with the positioning stop. The position of the positioning stop is adjusted to the central protrusion of the pressure roller and support roller. The pneumatic chuck clamps the control rod and rotates it to rotate the weld seam of the control rod between the pressure roller and support roller. The cylinder drives the pressure roller to press the weld seam and applies pressure to the weld seam to complete the weld rolling.

[0005] In one specific embodiment of this application, the rolling device further includes a control system. The control system is used to control the pneumatic chuck to clamp the control bar, control the rotation of the pneumatic chuck to drive the weld to rotate between the pressure roller and the support roller, and control the cylinder to move downward to drive the pressure roller to press the weld.

[0006] In one specific embodiment of this application, the rolling device further includes a first fixing bolt, a second fixing bolt, and a third fixing bolt. The rolling component also includes a supporting base plate. The chuck seat is fixed to the supporting platform by the first fixing bolt, the positioning component is fixed to the supporting base plate by the second fixing bolt, and the supporting base plate is fixed to the supporting platform by the third fixing bolt.

[0007] In one specific embodiment of this application, the rolling component further includes a cylinder fixing bolt, a cylinder fixing plate, a pressure roller support, a pressure roller guide plate, a fourth fixing bolt, a spring retaining ring, a first bearing, a bearing sleeve, a pressure roller shaft, a guide sleeve mounting plate, a guide sleeve mounting bolt, a support roller shaft, a support roller support, a mounting plate, a positioning bolt, a pad, and a support base plate. The cylinder is mounted on the cylinder fixing plate by the cylinder fixing bolt, and the cylinder fixing plate is mounted on the mounting plate. The cylinder core rod is connected to the pressure roller support by the fourth fixing bolt and is limited within the pressure roller guide plate. The pressure roller is mounted on the pressure roller shaft and fixed to the pressure roller support by the spring retaining ring, the first bearing, and the bearing sleeve. The support roller is fixed to the support roller support by the support roller shaft, and the support roller support is fixed to the support base plate by the positioning bolt. The pad is used to adjust the height of the support roller support. The guide sleeve is mounted on the guide sleeve mounting plate and mounted on the mounting plate by the guide sleeve mounting bolt.

[0008] In one specific embodiment of this application, the positioning component further includes a second bearing, a positioning sleeve, a positioning block locking wheel, a positioning adjusting wheel, a locking nut, and a positioning block bracket. The positioning block is connected to the positioning sleeve via the second bearing and fixed by the locking nut. The positioning sleeve is connected to the positioning adjusting wheel and the positioning block bracket. The position of the positioning block is adjusted by rotating the positioning adjusting wheel, and the position of the positioning block is locked by rotating the positioning block locking wheel.

[0009] In one specific embodiment of this application, the pressure roller and the support roller are processed with cemented carbide, and the hardness of the contact surface between the pressure roller and the support roller and the weld is not less than 60 HRC.

[0010] In one specific embodiment of this application, the rolling device further includes a protective device. The protective device is used to cover the chuck seat, pneumatic chuck, rolling components, and positioning components.

[0011] A second aspect of this application provides a method for rolling the weld seam of a control rod for nuclear power plants. This rolling method utilizes the rolling device for control rod weld seams provided in the first aspect of this application to roll the weld seam of the control rod. The rolling method includes: passing the control rod through a pneumatic chuck and guide sleeve in the rolling device until it is in close contact with a positioning block; adjusting the position of the positioning block to the central protrusion of the pressure roller and support roller in the rolling device; clamping the control rod with the pneumatic chuck and rotating it to drive the weld seam of the control rod to rotate between the pressure roller and support roller; and using a cylinder in the rolling device to drive the pressure roller to press the weld seam and apply pressure to the weld seam to complete the weld rolling.

[0012] In one specific embodiment of this application, the rolling device further includes a control system. The aforementioned method of using a pneumatic chuck to clamp and rotate the control bar, thereby causing the weld seam of the control bar to rotate between the pressure roller and the support roller, includes: using the control system to control the pneumatic chuck to clamp and rotate the control bar, thereby causing the weld seam of the control bar to rotate between the pressure roller and the support roller. The aforementioned method of using a cylinder in the rolling device to drive the pressure roller to press the weld seam and apply pressure to the pressure roller to complete the weld rolling includes: using the control system to control the cylinder in the pressure device to move downwards to drive the pressure roller to press the weld seam and apply pressure to the pressure roller to complete the weld rolling.

[0013] The beneficial effects of the technical solution of this application are as follows: by setting the rolling device including a chuck seat, a pneumatic chuck, rolling components, positioning components and a support platform, the positioning components are used to position the control rod in the rolling device, and the pneumatic chuck is used to clamp and rotate the control rod, thereby using the clamping and rotating method to roll the rod, effectively controlling the rolling effect of the weld and solving the problem of large weld reinforcement of the control rod. Attached Figure Description

[0014] Figure 1 The diagram shown is a structural schematic of a rolling device for control rod welds in nuclear power plants, provided in an embodiment of this application.

[0015] Figure 2 The diagram shown is a schematic diagram of the rolling component in a rolling device for control rod welds in nuclear power plants, provided in an embodiment of this application.

[0016] Figure 3 The diagram shown is a structural schematic of a positioning component in a rolling device for control rod welds in nuclear power plants, provided in an embodiment of this application.

[0017] Figure 4 The diagram shown is a schematic flow chart of a rolling method for control rod welds in nuclear power plants, provided in an embodiment of this application.

[0018] Figure 5The diagram shown is a schematic flow chart of a rolling method for control rod welds in nuclear power plants, provided in another embodiment of this application. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] At least one embodiment of this application provides a rolling device for the weld seam of control rods used in nuclear power plants, see reference. Figures 1 to 3 The rolling device includes a chuck seat 1, a pneumatic chuck 3, a rolling component 5, a positioning component 6, and a support platform 8. The chuck seat 1 and the rolling component 5 are mounted on the support platform 8. The pneumatic chuck 3 is mounted on the chuck seat 1 and is located between the chuck seat 1 and the rolling component 5. The positioning component 6 is located on the side of the rolling component 5 opposite to the pneumatic chuck 3 and is mounted on the rolling component 5. The rolling component 5 contains a cylinder 11, a pressure roller 16, a guide sleeve 23, and a support roller 24. The positioning component 6 includes a positioning stop 31. When the rolling device is working, the control rod is passed through the pneumatic chuck 3 and the guide sleeve until it is in close contact with the positioning block; the position of the positioning block is adjusted to the middle protrusion of the pressure roller 16 and the support roller 24; the control rod is clamped by the pneumatic chuck 3 and then rotated to drive the weld of the control rod to rotate in the middle of the pressure roller 16 and the support roller 24; the pressure roller 16 is driven by the cylinder 11 to press the weld and apply pressure to the weld to the pressure roller 16 to complete the weld rolling.

[0021] According to the technical solution provided in the embodiments of this application, by using the positioning component 6 to position the control rod in the rolling device, and using the pneumatic chuck 3 to clamp and rotate the control rod, the rod is rolled by clamping and rotating, which effectively controls the rolling effect of the weld and solves the problem of large weld excess height of the control rod.

[0022] In at least one embodiment of the rolling device provided in this application, the rolling device further includes a control system. The control system is used to control the pneumatic chuck 3 to clamp the control bar, control the pneumatic chuck 3 to rotate so that the weld seam rotates between the pressure roller 16 and the support roller 24, and control the cylinder 11 to move downward so that the pressure roller 16 presses the weld seam. In this way, through the positioning control of the positioning component 6 and the program control of the control system, the requirements for automatic continuous production can be achieved, which is beneficial to ensuring stable product quality.

[0023] In the rolling device provided in at least one embodiment of this application, reference is made to Figure 1 and Figure 2The rolling device also includes a first fixing bolt 2, a second fixing bolt 7, and a third fixing bolt 9. The rolling component 5 also includes a supporting base plate 30. The chuck seat 1 is fixed to the supporting platform 8 by the first fixing bolt 2, the positioning component 6 is fixed to the supporting base plate 30 by the second fixing bolt 7, and the supporting base plate 30 is fixed to the supporting platform 8 by the third fixing bolt 9. Thus, by using the first fixing bolt 2 to fix the relative position of the chuck seat 1 and the supporting platform 8, using the second fixing bolt 7 to fix the relative position of the positioning component 6 and the rolling component 5, and using the third fixing bolt 9 to fix the relative position of the supporting base plate 30 and the supporting platform 8, the structure of the rolling device is made more stable, which is beneficial to ensuring the rolling effect of the weld.

[0024] In the rolling device provided in at least one embodiment of this application, reference is made to Figure 2 The rolling component 5 also includes a cylinder fixing bolt 10, a cylinder fixing plate 12, a pressure roller support 13, a pressure roller guide plate 14, a fourth fixing bolt 15, a spring retaining ring 17, a first bearing 18, a bearing sleeve 19, a pressure roller shaft 20, a guide sleeve mounting plate 21, a guide sleeve mounting bolt 22, a support roller shaft 25, a support roller support 26, a mounting plate 27, a positioning bolt 28, a pad 29, and a support base plate 30. The cylinder 11 is mounted on the cylinder fixing plate 12 by the cylinder fixing bolt 10. The cylinder fixing plate 12 is mounted on the mounting plate 27. The core rod of the cylinder 11 is connected to the pressure roller support 13 by the fourth fixing bolt 15 and is limited within the pressure roller guide plate 14. The pressure roller is mounted on the pressure roller shaft 20 and fixed to the pressure roller support 13 by the spring retaining ring 17, the first bearing 18, and the bearing sleeve 19. The support roller 24 is fixed to the support roller support 26 by the support roller shaft 25. The support wheel support 26 is fixed to the support base plate 30 by positioning bolts 28. A shim 29 is used to adjust the height of the support wheel support 26. A guide sleeve 23 is mounted on a guide sleeve mounting plate 21 and then on a mounting plate 27 by guide sleeve mounting bolts 22. Thus, the height of the support wheel support 26 is adjusted by the shim 29, and the support wheel support 26 provides support.

[0025] In the rolling device provided in at least one embodiment of this application, reference is made to Figure 3The positioning component 6 also includes a second bearing 32, a positioning sleeve 33, a positioning block locking wheel 34, a positioning adjusting wheel 35, a locking nut 36, and a positioning block bracket 37. The positioning stop 31 is connected to the positioning sleeve 33 via the second bearing 32 and fixed by the locking nut 36. The positioning sleeve 33 is connected to the positioning adjusting wheel 35 and the positioning block bracket 37. The position of the positioning stop 31 is adjusted by rotating the positioning adjusting wheel 35, and the position of the positioning stop 31 is locked by rotating the positioning block locking wheel 34. Thus, by adding multiple components such as the positioning block locking wheel 34 and the positioning adjusting wheel 35 to the rolling component 5, the position of the positioning stop 31 is precisely adjusted to the central protrusion (i.e., the weld seam) between the pressure roller 16 and the support roller 24.

[0026] The installation and connection methods between the components in the rolling component 5 are only required to achieve the corresponding functions; therefore, this application embodiment does not impose specific limitations on these methods. For example, the guide sleeve 23 can be installed on the guide sleeve mounting plate 21 in a manner such as a spiral. The positioning sleeve 33 and the positioning adjusting wheel 35 can be connected in a manner such as welding. The positioning sleeve 33 and the positioning block bracket 37 can be connected in a manner such as a threaded connection.

[0027] In the rolling device provided in at least one embodiment of this application, the pressure roller 16 and the support roller 24 are processed with cemented carbide, and the hardness of the contact surface between the pressure roller 16 and the support roller 24 and the weld is not less than 60 HRC. Thus, by setting the pressure roller 16 and the support roller 24 to be processed with cemented carbide, and setting the hardness of the contact surface between the pressure roller 16 and the support roller 24 and the weld to be not less than 60 HRC, the hardness of the pressure roller 16 and the support roller 24 is improved, making the pressure roller 16 wear-resistant, non-deformable, and indented during rolling. Furthermore, through the material of the pressure roller 16 and the support roller 24 and the rolling design, the problem of rolling the weld excess height is further effectively solved.

[0028] In at least one embodiment of the rolling device provided in this application, the rolling device further includes a protective device 4. The protective device 4 is used to cover the chuck seat 1, the pneumatic chuck 3, the rolling component 5, and the positioning component 6. In this way, by adding the protective device 4, the entire rolling device is covered by the protective device, thus preventing personnel from being injured.

[0029] It should be noted that the protective device 4 can further cover components such as the support platform 8 in the rolling device, but this application embodiment does not specifically limit this.

[0030] At least one embodiment of this application also provides a method for rolling weld seams of control rods for nuclear power plants. This rolling method utilizes the rolling device for control rod weld seams of nuclear power plants described in the above embodiments of this application to roll the weld seams. (Reference) Figure 4 The rolling method includes the following steps.

[0031] S10: Pass the control bar through the pneumatic chuck and guide sleeve in the rolling device until it is in close contact with the positioning block.

[0032] S20: Adjust the position of the positioning block to the middle protrusion of the pressure roller and support roller in the rolling device.

[0033] S30: The control rod is clamped by a pneumatic chuck and then rotated to drive the weld of the control rod to rotate between the pressure roller and the support roller.

[0034] S40: The cylinder in the rolling device drives the pressure roller to press the weld seam and applies pressure to the weld seam to complete the weld seam rolling.

[0035] It should be noted that steps S10 to S40 can be executed manually or automatically, and this application embodiment does not specifically limit this. In step S40, the rolling effect of the weld can be effectively controlled by controlling rolling parameters such as cylinder pressure and rolling time, thereby meeting the technical requirements.

[0036] This rolling method is the usage method corresponding to the rolling device for the control rod weld of nuclear power plant in the above embodiments of this application. It includes the corresponding technical features of the rolling device for the control rod weld of nuclear power plant in the above embodiments of this application, and can at least achieve the corresponding technical effects, which will not be elaborated here.

[0037] In at least one embodiment of the rolling method provided in this application, the rolling device further includes a control system, as referenced. Figure 5 Step S31 is Figure 4 In the illustrated embodiment, step S30 is implemented in a specific way, and step S41 is... Figure 4 A specific implementation of step S40 in the illustrated embodiment.

[0038] S31: The control system controls the pneumatic chuck to clamp the control rod and rotate it, so as to drive the weld of the control rod to rotate between the pressure roller and the support roller.

[0039] S41: The control system controls the cylinder in the pressure device to move downward to drive the pressure roller to press the weld seam, and applies pressure to the weld seam to complete the weld seam rolling.

[0040] In this embodiment, by setting the control bar rolling process to be controlled by program and positioning, the requirements for automatic continuous production can be achieved, and the product quality is stable.

[0041] It should be noted that the combination of the technical features in the embodiments of this application is not limited to the combination methods described in the embodiments of this application or the combination methods described in specific embodiments. All technical features described in this application can be freely combined or combined in any way, unless they contradict each other.

[0042] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications or equivalent substitutions made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A rolling device for the weld seam of control rods used in nuclear power plants, characterized in that, Includes chuck holder, pneumatic chuck, rolling components, positioning components, and support platform. The chuck seat and the rolling component are mounted on the support platform. The pneumatic chuck is mounted on the chuck seat and located between the chuck seat and the rolling component. The positioning component is located on the side of the rolling component opposite to the pneumatic chuck and is mounted on the rolling component. The rolling component includes a cylinder, a pressure roller, a guide sleeve, and a support roller. The positioning component includes a positioning stop. When the rolling device is working, the control rod is passed through the pneumatic chuck and the guide sleeve until it is in close contact with the positioning block; the position of the positioning block is adjusted to the middle protrusion of the pressure roller and the support roller; the control rod is clamped by the pneumatic chuck and rotated to drive the weld of the control rod to rotate between the pressure roller and the support roller; the pressure roller is driven by the cylinder to press the weld and apply pressure to the weld to complete the weld rolling. The positioning component also includes a second bearing, a positioning sleeve, a positioning block locking wheel, a positioning adjusting wheel, a locking nut, and a positioning block bracket. The positioning block is connected to the positioning sleeve via the second bearing and is fixed by the locking nut. The positioning sleeve is connected to the positioning adjustment wheel and the positioning block bracket. The position of the positioning block is adjusted by rotating the positioning adjustment wheel, and the position of the positioning block is locked by rotating the positioning block locking wheel.

2. The rolling device according to claim 1, characterized in that, It also includes the control system, The control system is used to control the pneumatic chuck to clamp the control bar, control the pneumatic chuck to rotate so that the weld seam rotates between the pressure roller and the support roller, and control the cylinder to move downward so that the pressure roller presses the weld seam.

3. The rolling device according to claim 1, characterized in that, It also includes a first fixing bolt, a second fixing bolt, and a third fixing bolt. The rolling component also includes a supporting base plate. The chuck seat is fixed to the support platform by the first fixing bolt, the positioning component is fixed to the support base plate by the second fixing bolt, and the support base plate is fixed to the support platform by the third fixing bolt.

4. The rolling device according to claim 3, characterized in that, The rolling component also includes a cylinder fixing bolt, a cylinder fixing plate, a pressure roller support, a pressure roller guide plate, a fourth fixing bolt, a spring retaining ring, a first bearing, a bearing sleeve, a pressure roller shaft, a guide sleeve mounting plate, a guide sleeve mounting bolt, a support wheel shaft, a support wheel support, a mounting plate, positioning bolts, a pad, and a support base plate. The cylinder is mounted on the cylinder fixing plate by the cylinder fixing bolts, the cylinder fixing plate is mounted on the mounting plate, and the cylinder core rod is connected to the pressure roller support by the fourth fixing bolt and is confined within the pressure roller guide plate. The pressure roller is mounted on the pressure roller shaft and fixed to the pressure roller support by the spring retaining ring, the first bearing, and the bearing sleeve. The support wheel is fixed to the support wheel support via the support wheel axle, and the support wheel support is fixed to the support base plate via the positioning bolts. The pad is used to adjust the height of the support wheel support. The guide sleeve is mounted on the guide sleeve mounting plate and is mounted on the mounting plate by the guide sleeve mounting bolts.

5. The rolling device according to claim 1, characterized in that, The pressure roller and the support roller are processed with hard alloy, and the hardness of the contact surface between the pressure roller and the support roller and the weld is not less than 60 HRC.

6. The rolling device according to any one of claims 1 to 5, characterized in that, It also includes protective devices. The protective device is used to cover the chuck seat, the pneumatic chuck, the rolling component, and the positioning component.

7. A method for rolling weld seams of control rods used in nuclear power plants, characterized in that, Rolling the weld seam of a nuclear power control rod using the rolling device described in any one of claims 1 to 6, wherein the rolling method includes: Pass the control rod through the pneumatic chuck and guide sleeve in the rolling device until it makes close contact with the positioning block; Adjust the position of the positioning block to the middle protrusion of the pressure roller and support roller in the rolling device; The control rod is clamped by the pneumatic chuck and then rotated to cause the weld of the control rod to rotate between the pressure roller and the support roller. The cylinder in the rolling device drives the pressure roller to press the weld seam and applies pressure to the weld seam to complete the weld seam rolling.

8. The rolling method according to claim 7, characterized in that, The rolling device also includes a control system, wherein the control bar is clamped and rotated by the pneumatic chuck to drive the weld seam of the control bar to rotate between the pressure roller and the support roller, comprising: The control system controls the pneumatic chuck to clamp the control bar and rotate it, thereby causing the weld of the control bar to rotate between the pressure roller and the support roller. The step of using a cylinder in the rolling device to drive the pressure roller to press the weld seam and apply pressure to the pressure roller to complete the weld seam rolling includes: The control system controls the cylinder in the pressing device to move downwards to drive the pressure roller to press the weld seam, and applies pressure to the pressure roller to the weld seam to complete the weld seam rolling.

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