Automatic Maintenance Workbench for Electric Heaters in Nuclear Power Plants

Abstract

The present invention relates to an automatic maintenance work platform for electric heaters in a nuclear power plant, comprising: a clamping mechanism for clamping the electric heater to be processed; an adjustment base, on which the clamping mechanism is installed, and the adjustment base is provided with an installation interface for installing operation tools; and a centering adjustment structure for adjusting the position of the adjustment base according to the state of the electric heater to be processed and locking and fixing the adjustment base after adjusting the position, so that the operation tools operate on the electric heater to be processed on the clamping mechanism. The automatic maintenance work platform for electric heaters can realize the follow-up adjustment of the positions and angles of operation tools such as cutting and welding of the pressurizer electric heater according to the position state of the electric heater to be processed, and solve the problem of position docking between the operation tools and the electric heater to be processed on the premise of meeting stability.

Description

Technical Field

[0001] The present invention relates to the field of nuclear power, and more specifically, to an automatic maintenance work platform for electric heaters in a nuclear power plant. Background Art

[0002] In a pressurized water reactor nuclear power plant in the related art, a pressurizer is used to regulate the pressure of the reactor coolant system, and the pressurizer electric heater plays a key role in the pressure regulation process. The service life of the pressurizer electric heater is generally lower than the design life of the reactor, which means that the faulty electric heater needs to be repaired and replaced.

[0003] The replacement operation of the pressurizer electric heater is located at the bottom of the pressurizer, nearly 4 meters from the plant floor. Manual replacement requires a large amount of preparatory work, and the operator is exposed to a relatively high radiation dose. Therefore, it is necessary to develop an automatic replacement device. Limited by the narrow space, the automatic replacement device needs to be able to deliver the working tools to the working position and complete the docking with the parts to be processed. However, due to the large height difference, it is difficult to ensure the accurate docking and stability of the device. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an improved automatic maintenance work platform for electric heaters in a nuclear power plant in view of the above-mentioned defects of the prior art.

[0005] The technical solution adopted by the present invention to solve its technical problems is to construct an automatic maintenance work platform for electric heaters in a nuclear power plant, including:

[0006] A clamping mechanism for clamping the electric heater to be processed;

[0007] An adjustment base, on which the clamping mechanism is installed, and an installation interface for installing an operating tool is provided on the adjustment base; and

[0008] A centering adjustment structure for adjusting the position of the adjustment base according to the state of the electric heater to be processed, and locking and fixing the adjustment base after adjusting the position, so that the operating tool operates on the electric heater to be processed on the clamping mechanism.

[0009] In some embodiments, the centering adjustment structure includes an adjustment device and a locking device. The adjustment device includes an adjustment member slidably installed, and the adjustment base is connected to the adjustment member so that the adjustment member can adjust the position along with the electric heater to be processed on the clamping mechanism, and the locking device locks and fixes the adjustment member.

[0010] In some embodiments, the adjustment device further includes two support plates arranged in parallel at intervals, and the adjustment member is clamped between the two support plates and slidably cooperates with the two support plates.

[0011] In some embodiments, the adjusting member includes a sliding plate clamped between the two support plates, and spheres rotatably arranged are distributed on at least one side of the two opposite sides of the two support plates to support the sliding of the adjusting member.

[0012] In some embodiments, the adjusting member further includes an adjusting bearing adjustably mounted on the sliding plate. The adjusting seat includes a positioning cylinder through which the electric heater to be processed passes, and the adjusting bearing is sleeved outside the positioning cylinder.

[0013] In some embodiments, the clamping mechanism includes a clamping hole for clamping the electric heater to be processed. The clamping hole communicates with the inner hole of the positioning cylinder for the electric heater to be processed to pass through.

[0014] In some embodiments, adjusting holes are provided in the middle of the two support plates, and the positioning cylinder passes through the adjusting holes.

[0015] In some embodiments, the locking device is installed on the support plate and is used to lock and fix the two support plates to the adjusting member or release the adjusting member.

[0016] In some embodiments, the centering adjustment structure further includes a centering device. The centering device is connected to the adjusting seat and is used to drive the adjusting member and the adjusting seat to the initial position.

[0017] In some embodiments, the centering device includes a connecting member and a centering clamp. The connecting member is connected to the adjusting seat and includes an adjusting rod parallel to the axis of the clamping hole on the clamping mechanism. The centering clamp includes a first clamping head and a second clamping head that can approach or move away from each other;

[0018] A clamping opening for clamping the adjusting rod is formed between the first clamping head and the second clamping head. When the first clamping head and the second clamping head approach, the adjusting rod is clamped to make the adjusting member and the adjusting seat reach the initial position. When the first clamping head and the second clamping head move away, the adjusting rod is released to allow the adjusting seat to adjust its position along with the electric heater to be processed.

[0019] Implementing the automatic maintenance work platform for nuclear power plant electric heaters of the present invention has the following beneficial effects: The automatic maintenance work platform for electric heaters can realize the follow-up adjustment of the positions and angles of operation tools such as cutting and welding of the pressurizer electric heater according to the position state of the electric heater to be processed, and solve the problem of position docking between the operation tool and the electric heater to be processed on the premise of meeting stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the drawings and embodiments. In the drawings:

[0021] Figure 1It is a three-dimensional structural schematic diagram after the adjustment seat of the automatic maintenance work platform of the nuclear power plant electric heater in the embodiment of the present invention is positioned to the initial position;

[0022] Figure 2 It is Figure 1 a structural schematic diagram after the positioning seat in it is loosened;

[0023] Figure 3 It is Figure 1 a sectional schematic diagram of the automatic maintenance work platform of the electric heater in it. Specific embodiments

[0024] For a clearer understanding of the technical features, objectives, and effects of the present invention, the specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0025] As Figures 1 to 3 shown, the automatic maintenance work platform of the nuclear power plant electric heater in a preferred embodiment of the present invention includes a clamping mechanism 1, an adjustment seat 2, and a centering adjustment structure 3. The clamping mechanism 1 is installed on the adjustment seat 2. The clamping mechanism 1 is used to clamp the electric heater to be processed. An installation interface 21 for installing operating tools is provided on the adjustment seat 2. The installation interface 21 is a universal interface that can install operating tools such as welding and cutting tools. The operating tools can perform operations such as welding and cutting on the electric heater to be processed clamped by the clamping mechanism 1.

[0026] Furthermore, the centering adjustment structure 3 is used to adjust the position of the adjustment seat 2 according to the state of the electric heater to be processed, and lock and fix the adjustment seat 2 after adjusting the position, so that the operating tools can operate on the electric heater to be processed on the clamping mechanism 1.

[0027] The automatic maintenance work platform of the electric heater can realize the follow-up adjustment of the position and angle of the cutting, welding and other operating tools of the pressurizer electric heater according to the position state of the electric heater to be processed, and solve the position docking problem between the operating tools and the electric heater to be processed on the premise of meeting the stability.

[0028] The adjustment seat 2 includes a positioning cylinder 22 for the electric heater to be processed to pass through. The positioning cylinder 22 can be connected to the centering adjustment structure 3. After the electric heater to be processed passes through the positioning cylinder 22, it reaches the clamping mechanism 1 and is clamped and positioned by the clamping mechanism 1. The centering adjustment structure 3 makes the steering and position of the adjustment seat 2 adjustable. During the process of the clamping mechanism 1 clamping the electric heater to be processed, the adjustment seat 2 can adjust the steering and position according to the set angle and position of the electric heater to be processed, so that the clamping mechanism 1 stably clamps the electric heater to be processed.

[0029] The clamping mechanism 1 is arranged between the positioning cylinder 22 and the mounting interface 21. After the electric heater to be processed passes through the positioning cylinder 22 and is clamped by the clamping mechanism 1, the working tool on the mounting interface 21 can operate on the electric heater to be processed.

[0030] Specifically, in this embodiment, the clamping mechanism 1 includes a clamping hole 11 for clamping the electric heater to be processed. The clamping hole 11 is communicated with the inner hole of the positioning cylinder 22 for the electric heater to be processed to pass through. The size of the clamping hole 11 can be contracted to clamp and release the electric heater to be processed.

[0031] In some embodiments, the centering adjustment structure 3 includes an adjustment device 31, a locking device 32, and a centering device 33. The adjustment device 31 includes an adjustment member 311 slidably installed. The adjustment base 2 is connected to the adjustment member 311 so that the adjustment member 311 can adjust its position along with the electric heater to be processed on the clamping mechanism 1. The locking device 32 locks and fixes the adjustment member 311 to fix the positions of the adjustment base 2, the adjustment member 311, and the clamping mechanism 1.

[0032] Preferably, the adjustment device 31 further includes two support plates 312 arranged in parallel at intervals. The adjustment member 311 is clamped between the two support plates 312 and is slidably matched with the two support plates 312. Preferably, in this embodiment, an adjustment hole 3121 is provided in the middle of the two support plates 312, through which the middle part of the adjustment member 311 can be exposed, defining the moving range of the adjustment member 311 and the adjustment base 2. At the same time, it also allows the electric heater to be processed to pass through the adjustment member 311 and the adjustment base 2 in the middle of the adjustment hole 3121. Further, an adjustment hole 3121 is provided in the middle of the two support plates 312, and the positioning cylinder 22 passes through the adjustment hole 3121, allowing the electric heater to be processed to pass through the two support plates 312.

[0033] In some embodiments, the adjustment member 311 includes a sliding plate 3111 clamped between the two support plates 312, and an adjustment bearing 3112 rotatably installed on the sliding plate 3111 with adjustable steering position. The sliding plate 3111 can slide between the two support plates 312 to adjust the lateral positions of the adjustment member 311 and the adjustment base 2. The adjustment base 2 is connected to the adjustment bearing 3112 to adjust the steering of the adjustment base 2. In this embodiment, the adjustment bearing 3112 is sleeved outside the positioning cylinder 22. The adjustment bearing 3112 is a spherical plain bearing. Preferably, its outer shape is spherical and is rotatably matched with the sliding plate 3111 to adjust the steering of the adjustment base 2 relative to the adjustment member 311.

[0034] Spheres 3122 are rotatably arranged on two opposite sides of the two support plates 312 to support the sliding of the adjusting member 311, which can reduce the friction force. In other embodiments, spheres 3122 may be distributed on only one side of the two opposite sides of the two support plates 312. One side of the sliding plate 3111 cooperates with the spheres 3122, and the other side slides cooperatively with the support plate 312 without spheres 3122, so that the spheres 3122 rotate when the sliding plate 3111 slides, reducing the friction force. Also, the spheres 3122 can be cancelled on the two opposite sides of the two support plates 312, and the two sides of the sliding plate 3111 slide cooperatively with the support plate 312.

[0035] Further, a locking device 32 is installed on the support plate 312 for locking and fixing the two support plates 312 to the adjusting member 311 or releasing the adjusting member 311. Specifically, the locking device 32 includes a locking pin 321 penetrating through one support plate 312. After the locking pin 321 axially extends into the support plate 312, the sliding plate 3111 can be pressed and locked so that the sliding plate 3111 cannot slide, realizing locking the adjusting member 311 so that it will no longer move or be displaced, and enabling the operating tool to operate on the electric heater to be processed. The expansion and contraction of the locking pin 321 can be electrically controlled by a motor. In other embodiments, the locking pin 321 can also be screwed onto the support plate 312, and the rotation of the locking pin 321 is controlled to achieve locking and unlocking.

[0036] The centering device 33 is connected to the adjustment seat 2. After the operating tool finishes operating on the electric heater to be processed, the locking device 32 is released, and the centering device 33 drives the adjusting member 311 and the adjustment seat 2 to the initial position. When it is necessary to use the electric heater automatic maintenance work platform to operate on the electric heater to be processed again, the centering device 33 is released, and the adjusting device 31 and the adjustment seat 2 are restored to the initial position where they can adjust the position along with the electric heater to be processed, facilitating unified positioning so that the subsequent operation can accurately position and sleeve onto the electric heater to be processed. Usually, the operations of the locking device 32 and the centering device 33 are electrically controlled to avoid manual operation and reduce the radiation to the human body.

[0037] Further, the centering device 33 is connected to the adjustment seat 2 for driving the adjusting member 311 and the adjustment seat 2 to the initial position. In some embodiments, the centering device 33 includes a connecting member 331 and a centering clamp 332. The connecting member 331 is connected to the adjustment seat 2 and includes an adjusting rod 3311 parallel to the axis of the clamping hole 11 on the clamping mechanism 1 and a connecting rod 3312 connecting the adjusting rod 3311 and the adjustment seat 2. The connecting member 331 can be positioned by using the centering clamp 332 to clamp the adjusting rod 3311, so that the connecting member 331 drives the adjustment seat 2 to return to the initial position.

[0038] Specifically, in this embodiment, the centering clamp 332 includes a first chuck 3321 and a second chuck 3322 that can approach or separate from each other. A clamping opening for clamping the adjusting rod 3311 is formed between the first chuck 3321 and the second chuck 3322. When the first chuck 3321 and the second chuck 3322 approach each other, the adjusting rod 3311 is clamped to move the adjusting member 311 and the adjustment base 2 to the initial position. When the first chuck 3321 and the second chuck 3322 separate from each other, the adjusting rod 3311 is released, allowing the adjustment base 2 to adjust its position along with the electric heater to be processed.

[0039] Preferably, the heads of the first chuck 3321 and the second chuck 3322 are both V-shaped. When the first chuck 3321 and the second chuck 3322 separate from each other, the two opposite V-shaped heads can define the movement range of the adjusting rod 3311, keeping the adjusting rod 3311 within a controllable range. When the first chuck 3321 and the second chuck 3322 approach each other, the two opposite V-shaped heads intersect to clamp and position the adjusting rod 3311 accurately. The movement of the first chuck 3321 and the second chuck 3322 is controlled by a motor, and the movement range of the first chuck 3321 and the second chuck 3322 is specific, so that the position of the adjusting rod 3311 clamped after approaching is also specific, thereby centering the adjustment base 2.

[0040] Of course, the centering device 33 can also be omitted, and the adjusting device 31 can be provided with an automatic reset structure to reset the adjustment base 2 to the initial position.

[0041] It can be understood that the above technical features can be combined arbitrarily without limitation.

[0042] The above are only embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied to other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. An automatic maintenance work platform for electric heaters in a nuclear power plant, characterized in that Comprising: A clamping mechanism (1) for clamping the electric heater to be processed; An adjustment base (2), the clamping mechanism (1) is installed on the adjustment base (2), and the adjustment base (2) is provided with an installation interface (21) for installing an operating tool; and A centering adjustment structure (3) for adjusting the position of the adjustment base (2) according to the state of the electric heater to be processed, and locking and fixing the adjustment base (2) after adjusting the position, so that the operating tool operates on the electric heater to be processed on the clamping mechanism (1); Wherein, the clamping mechanism (1) includes a clamping hole (11) for clamping the electric heater to be processed, the adjustment base (2) includes a positioning cylinder (22) for the electric heater to be processed to pass through, the positioning cylinder (22) is connected to the centering adjustment structure (3), and the clamping hole (11) communicates with the inner hole of the positioning cylinder (22) for the electric heater to be processed to pass through; The centering adjustment structure (3) includes an adjustment device (31) and a locking device (32), the adjustment device (31) includes an adjustment member (311) installed slidably, the adjustment base (2) is connected to the adjustment member (311), so that the adjustment member (311) can adjust the position along with the electric heater to be processed on the clamping mechanism (1), and the locking device (32) locks and fixes the adjustment member (311); The adjustment device (31) further includes two support plates (312) arranged in parallel at intervals, the adjustment member (311) is clamped between the two support plates (312) and is slidably matched with the two support plates (312); The adjustment member (311) includes a sliding plate (3111) clamped between the two support plates (312), and an adjustment bearing (3112) installed on the sliding plate (3111) with adjustable steering position, and the adjustment bearing (3112) is sleeved outside the positioning cylinder (22).

2. The automatic maintenance work platform for the nuclear power plant electric heater according to claim 1, wherein Spheres (3122) rotatably arranged are distributed on at least one side of the two opposite sides of the two support plates (312) to support the sliding of the adjustment member (311).

3. The automatic maintenance work platform for the nuclear power plant electric heater according to claim 1, wherein Adjustment holes (3121) are provided in the middle of the two support plates (312), and the positioning cylinder (22) passes through the adjustment holes (3121).

4. The automatic maintenance work platform for the electric heater of a nuclear power plant according to any one of claims 1 to 3, characterized in that, The locking device (32) is installed on the support plate (312) for locking and fixing the two support plates (312) to the adjustment member (311) or loosening the adjustment member (311).

5. The automatic maintenance work platform for the nuclear power plant electric heater according to any one of claims 1 to 3, characterized in that The centering adjustment structure (3) further includes a centering device (33), the centering device (33) is connected to the adjustment base (2) for driving the adjustment member (311) and the adjustment base (2) to the initial position.

6. The automatic maintenance work platform for the nuclear power plant electric heater according to claim 5, wherein The centering device (33) includes a connecting member (331) and a centering clamp (332). The connecting member (331) is connected to the adjusting base (2) and includes an adjusting rod (3311) parallel to the axis of the clamping hole (11) on the clamping mechanism (1). The centering clamp (332) includes a first clamp head (3321) and a second clamp head (3322) that can approach or move away from each other. A clamping opening for clamping the adjusting rod (3311) is formed between the first clamp head (3321) and the second clamp head (3322). When the first clamp head (3321) and the second clamp head (3322) approach each other, the adjusting rod (3311) is clamped to return the adjusting member (311) and the adjusting base (2) to the initial position. When the first clamp head (3321) and the second clamp head (3322) move away from each other, the adjusting rod (3311) is released to allow the adjusting base (2) to adjust its position along with the electric heater to be processed.

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