Grinding device for manhole sealing surfaces in nuclear power plants

Abstract

This disclosure pertains to the field of nuclear power technology, specifically relating to a grinding device for manhole sealing surfaces in nuclear power plants. The grinding device provided in this disclosure enables automatic, uniform, and efficient grinding of manhole sealing surfaces, improving grinding quality and efficiency, and avoiding the shortcomings and defects of manual grinding; it reduces the labor intensity and radiation dose for workers, ensuring their health and safety; this disclosure also improves the sealing performance of manhole sealing surfaces, ensuring the safe operation of nuclear power plant equipment; furthermore, this disclosure has a simple structure, is easy to operate and maintain, and is suitable for manhole sealing surfaces of different sizes and shapes.

Description

Technical Field

[0001] This disclosure belongs to the field of nuclear power technology, and specifically relates to a grinding device for the sealing surface of manholes in nuclear power plants. Background Technology

[0002] Manhole sealing surfaces in nuclear power plants refer to the sealing surfaces of manholes on equipment such as steam generators, exhaust heat exchangers, and pressurizers. Their sealing performance directly affects the safe operation of the equipment. Grinding manhole sealing surfaces involves polishing them to remove oxide layers, dirt, burrs, and minor scratches, improving the smoothness and flatness of the sealing surface, thereby enhancing the sealing effect.

[0003] Currently, the grinding of manhole sealing surfaces in nuclear power plants is mainly carried out manually, with workers using sandpaper or grinding wheels to polish the surfaces. This method has the following drawbacks: low efficiency, long processing time, and the need for multiple people to work together; poor work quality, uneven grinding, and a tendency to damage or deform the sealing surface; harsh working environment with high radiation levels, posing a health hazard to workers; and high difficulty, requiring workers to operate in confined spaces, increasing the risk of accidents or injuries. Therefore, there is an urgent need to improve the grinding efficiency of manhole sealing surfaces and reduce the difficulty of manual operation. Summary of the Invention

[0004] To overcome the problems existing in related technologies, a grinding device for the sealing surface of manholes in nuclear power plants is provided.

[0005] According to one aspect of the present disclosure, a grinding apparatus for a manhole sealing surface in a nuclear power plant is provided, the apparatus comprising: a jaw clamping mechanism and an internal grinding mechanism;

[0006] The jaw clamping mechanism is used to clamp the manhole sealing surface, so that the automatic grinding machine is fixed on the grinding surface. The jaw clamping mechanism includes a large bevel gear, multiple small bevel gears, and multiple jaws. Each small bevel gear meshes with one side of the large bevel gear, and the other side of the large bevel gear is provided with a planar thread structure. The rudder threads at the lower end of each jaw mesh with the planar thread. When the small bevel gear is rotated, the large bevel gear rotates accordingly, and the planar thread of the large bevel gear causes the three jaws to move closer to or away from the center at the same time.

[0007] The internal grinding mechanism is used to grind the sealing surface of the manhole. The internal grinding mechanism includes a base, a grinding disc, a laser rangefinder, an electric lifting platform, and a rotating column.

[0008] The chassis base is fixedly connected to the large bevel gear of the chuck clamping mechanism to support the internal grinding mechanism; the grinding disc is bolted to the chassis base to contact and grind the manhole sealing surface; the grinding disc has multiple countersunk holes, and a laser rangefinder is placed in each countersunk hole to measure the distance between the grinding disc and the manhole sealing surface; the electric lifting platform is installed below the grinding disc to adjust the distance and pressure between the grinding disc and the manhole sealing surface.

[0009] In one possible implementation, the device further includes multiple electric sandpaper tables; each electric sandpaper table includes sandpaper, a support, a rotary motor, and two rotary drums;

[0010] In each electric sandpaper table, one drum is mounted on the inside of the grinding disc via a bracket, and the other drum is mounted on the outside of the grinding disc via a bracket. The sandpaper is wound in rolls around the two drums. One end of each drum is connected to a drum motor. When the sandpaper needs to be replaced, the drum motor drives the two drums to rotate in the same direction, so that the old sandpaper is rolled into one drum and the new sandpaper is rolled out from the other drum and laid flat on the surface of the grinding disc.

[0011] In one possible implementation, the electric lifting platform includes a lifting motor, a lead screw, and a slider. The lifting motor drives the lead screw to rotate, causing the slider to move up and down along the lead screw, thereby driving the grinding disc to move up and down.

[0012] In one possible implementation, multiple rollers are provided at the lower end of the chassis base and are slidably connected to the upper surface of the electric lifting platform.

[0013] In one possible implementation, the base is a disk with a central short cylinder, and the rotating column is connected to the central cylinder of the base by a thread. A rotary motor drives the rotating column to rotate, thereby driving the base and the grinding disk to rotate.

[0014] In one possible implementation, the operation of the device includes:

[0015] Step 101: Install the jaw clamping mechanism of the grinder onto the outer contour of the manhole to be ground, and after clamping, start the laser rangefinder to measure the initial distance data between the grinding disc and the sealing surface of the manhole.

[0016] Step 102: Start the lifting motor to drive the electric lifting platform and bring the grinding disc closer to the manhole sealing surface until it contacts the manhole sealing surface and generates a certain pressure.

[0017] Step 103: Start grinding. Start the rotary motor to drive the rotating column, causing the base and grinding disc to rotate. The relative movement between the grinding disc and the manhole sealing surface produces the grinding effect. At the same time, the laser rangefinder measures the distance change between the grinding disc and the manhole sealing surface in real time. According to the set grinding depth, the height of the electric lifting platform is automatically adjusted to maintain the appropriate pressure between the grinding disc and the manhole sealing surface.

[0018] Step 104: When the sandpaper is worn or contaminated, the electric lifting platform slowly moves backward, causing the grinding disc to disengage from the manhole sealing surface. At the same time, the drum motor rotates, and the drum dispenses new sandpaper. After replacement, the electric lifting platform rises again, causing the grinding disc to re-engage with the manhole sealing surface, and grinding continues.

[0019] Step 105: When the preset grinding depth or grinding time is reached, stop grinding, lower the electric lifting platform to completely separate the grinding disc from the manhole sealing surface, stop the motor from rotating, stop the chassis and grinding disc from rotating, release the clamping mechanism, and remove the grinder from the manhole to complete the grinding work.

[0020] The beneficial effects of this disclosure are as follows: the grinding device for manhole sealing surfaces in nuclear power plants provided by this disclosure can achieve automatic, uniform, and efficient grinding of manhole sealing surfaces, improve grinding quality and efficiency, and avoid the shortcomings and defects of manual grinding; reduce the labor intensity and radiation dose of workers, and protect the health and safety of workers; this disclosure can also improve the sealing performance of manhole sealing surfaces and ensure the safe operation of nuclear power plant equipment; in addition, this disclosure has a simple structure, is easy to operate and maintain, and is suitable for manhole sealing surfaces of different sizes and shapes. Attached Figure Description

[0021] Figure 1 This is a perspective view of a grinding device for a manhole sealing surface in a nuclear power plant, as shown in an embodiment of this disclosure.

[0022] Figures 2 to 3 This is a schematic diagram of a jaw clamping mechanism of a grinding device for a manhole sealing surface in a nuclear power plant, as shown in an embodiment of this disclosure.

[0023] Figure 4 This is a cross-sectional view of a grinding apparatus for a manhole sealing surface in a nuclear power plant, as shown in an embodiment of this disclosure.

[0024] Figure 5 This is a schematic diagram of the internal grinding mechanism of a grinding device for a manhole sealing surface in a nuclear power plant, as shown in an embodiment of this disclosure.

[0025] Figure 6 This is a schematic diagram of a sandpaper table for a grinding device used for the sealing surface of a manhole in a nuclear power plant, as shown in an embodiment of this disclosure. Detailed Implementation

[0026] The present disclosure will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0027] Unless otherwise defined, the technical and scientific terms used in this disclosure have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains; the terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure; the term "comprising" and any variations thereof in this disclosure are intended to cover non-exclusive inclusion. Clearly, the embodiments described in this disclosure are only a part of the embodiments of this disclosure, and not all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of this disclosure without inventive effort are within the scope of protection of this disclosure.

[0028] In this disclosure, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this disclosure. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0029] Figure 1 This is a perspective view of a grinding apparatus for a manhole sealing surface in a nuclear power plant, as shown in an embodiment of this disclosure. Figures 2 to 3 This is a schematic diagram of a jaw clamping mechanism for a grinding device used on the sealing surface of a manhole in a nuclear power plant, as shown in an embodiment of this disclosure. Figures 1 to 3 As shown, the device includes: a jaw clamping mechanism 1 and an internal grinding mechanism 2.

[0030] The jaw clamping mechanism 1 is used to clamp the manhole sealing surface, fixing the automatic grinding machine on the grinding surface. The jaw clamping mechanism 1 includes a large bevel gear 13, multiple small bevel gears 12, and multiple jaws 11. Each small bevel gear 12 meshes with one side of the large bevel gear 13, and the other side of the large bevel gear 13 has a planar thread structure. The teeth at the lower end of each jaw 11 mesh with the planar thread. When the small bevel gear 12 is rotated in a first rotation direction, the large bevel gear 13 rotates accordingly, and the planar thread of the large bevel gear 13 causes the three jaws to move closer to the center simultaneously. When the small bevel gear 12 is rotated in a second rotation direction (opposite to the first rotation direction), the large bevel gear 13 rotates accordingly, and the planar thread on the back of the large bevel gear 13 causes the three jaws to move away from the center simultaneously. In this way, the position and clamping force of the jaws 11 can be adjusted infinitely and smoothly by rotating each small bevel gear 12. The operation is simple and suitable for manhole sealing surfaces of different sizes and shapes.

[0031] Figure 4 This is a cross-sectional view of a grinding apparatus for a manhole sealing surface in a nuclear power plant, as shown in an embodiment of this disclosure. Figure 5 This is a schematic diagram of the internal grinding mechanism of a grinding device for a manhole sealing surface in a nuclear power plant, as shown in an embodiment of this disclosure. See also... Figure 1, Figure 4 and Figure 5 The internal grinding mechanism 2 is used to grind the sealing surface of the manhole. The internal grinding mechanism 2 includes a base 21, a grinding disc 22, a laser rangefinder 23, multiple electric sandpaper tables 24, an electric lifting platform 25, and a rotating column 26.

[0032] The base 21 is fixedly connected to the large bevel gear 13 of the chuck clamping mechanism to support the internal grinding mechanism; the grinding disc 22 is bolted to the base 21 and is used to contact the manhole sealing surface for grinding (upper surface of the grinding disc 22). The grinding disc 22 has multiple countersunk holes, and a laser rangefinder 23 is placed in each countersunk hole to measure the distance between the grinding disc 22 and the manhole sealing surface.

[0033] Each electric sandpaper table 24 is installed above the grinding disc 22 to provide and automatically replace sandpaper. Each electric sandpaper table 24 includes sandpaper 241, a support 242, a rotary motor 243, and two rotary drums 244. One rotary drum 244 is mounted on the inner side of the grinding disc 22 via the support 242, and the other rotary drum 244 is mounted on the outer side of the grinding disc 22 via the support 242. The sandpaper 241 is wound in rolls around the two rotary drums 244. One end of each rotary drum 244 is connected to the rotary motor 243. The support 242 is used to fix the rotary motor 243 and the rotary drums 244, maintaining a certain distance and angle between them and the grinding disc 22. When the sandpaper 241 needs to be replaced, the rotary motor 243 drives the two rotary drums 244 to rotate in the same direction, causing the old sandpaper 241 to be wound into one rotary drum 244, and the new sandpaper 241 to be rolled out from the other rotary drum 244 and laid flat on the upper surface of the grinding disc 22. This allows for quick replacement of sandpaper without the need for manual sandpaper changes or disassembly of any parts, thus preventing foreign objects from falling out, further improving efficiency, and reducing personnel exposure.

[0034] An electric lifting platform 25 is installed below the grinding disc 22 and is used to adjust the distance and pressure between the grinding disc 22 and the manhole sealing surface. The electric lifting platform 25 includes a lifting motor, a lead screw and a slider. The lifting motor drives the lead screw to rotate, causing the slider to move up and down along the lead screw, thereby driving the grinding disc 22 to move up and down.

[0035] The base 21 is a disc with a short central cylinder. The rotating column 26 is connected to the central cylinder of the base 21 by threads. A rotary motor drives the rotating column 26 to rotate, thereby driving the base 21 and the grinding disc 22 to rotate. During operation, the electric lifting platform 25 raises the grinding disc 22 to approach the manhole sealing surface until it contacts the manhole sealing surface and generates a certain pressure. The rotating column 26 then causes the base 21 and the grinding disc 22 to rotate.

[0036] Multiple rollers can be installed at the lower end of the chassis base 21 and slidably connected to the upper surface of the electric lifting platform 25. The rollers can be, for example, steel ball rollers or universal rollers. In this way, the multiple rollers can provide stable support for the chassis base 21 without hindering the chassis base 21 from rotating relative to the electric lifting platform 25.

[0037] In one possible implementation, see Figures 1 to 6 The working process of the device disclosed herein is as follows:

[0038] Step 101: Install the jaw clamping mechanism 1 of the grinding machine onto the outer contour of the manhole to be ground, and after clamping, start the laser rangefinder 23 to measure the initial distance data between the grinding disc 22 and the sealing surface of the manhole.

[0039] Step 102: Start the lifting motor to drive the electric lifting platform 25, so that the grinding disc 22 moves closer to the manhole sealing surface until it contacts the manhole sealing surface and generates a certain pressure.

[0040] Step 103: Start grinding. Start the rotary motor to drive the rotating column 26, causing the base 21 and grinding disc 22 to rotate. The relative movement between the grinding disc 22 and the manhole sealing surface produces the grinding effect. At the same time, the laser rangefinder 23 measures the distance change between the grinding disc 22 and the manhole sealing surface in real time. According to the set grinding depth, the height of the electric lifting platform 25 is automatically adjusted to maintain the appropriate pressure between the grinding disc 22 and the manhole sealing surface. In this way, the laser rangefinder 23 and the electric lifting platform 25 can work together to automatically adjust the distance between the grinding disc 22 and the manhole sealing surface according to the actual grinding situation. This is more accurate and timely than manual judgment and manual adjustment of the grinding position, thereby reducing human error and significantly improving the efficiency and quality of grinding.

[0041] Step 104: When the sandpaper 241 is worn or contaminated, the electric lifting platform 25 slowly moves backward, causing the grinding disc 22 to disengage from the manhole sealing surface. At the same time, the rotary drum motor 243 rotates, and the rotary drum 244 dispenses new sandpaper 241. After replacement, the electric lifting platform 25 rises again, causing the grinding disc 22 to re-engage with the manhole sealing surface, and grinding continues.

[0042] Step 105: When the preset grinding depth or grinding time is reached, grinding is stopped, the electric lifting platform 25 is lowered, so that the grinding disc 22 is completely separated from the manhole sealing surface, the motor stops rotating, so that the chassis base 21 and the grinding disc 22 stop rotating, the clamping mechanism is released, and the grinder is removed from the manhole to complete the grinding work.

[0043] The grinding device for manhole sealing surfaces in nuclear power plants provided in this disclosure can achieve automatic, uniform, and efficient grinding of manhole sealing surfaces, improve grinding quality and efficiency, and avoid the shortcomings and defects of manual grinding; reduce the labor intensity and radiation dose of workers, and protect the health and safety of workers; this disclosure can also improve the sealing performance of manhole sealing surfaces and ensure the safe operation of nuclear power plant equipment; in addition, this disclosure has a simple structure, is easy to operate and maintain, and is suitable for manhole sealing surfaces of different sizes and shapes.

[0044] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A grinding apparatus for the sealing surface of a manhole in a nuclear power plant, characterized in that, The device includes: a jaw clamping mechanism and an internal grinding mechanism; The jaw clamping mechanism is used to clamp the manhole sealing surface, so that the automatic grinding machine is fixed on the grinding surface. The jaw clamping mechanism includes a large bevel gear, multiple small bevel gears, and multiple jaws. Each small bevel gear meshes with one side of the large bevel gear, and the other side of the large bevel gear is provided with a planar thread structure. The rudder threads at the lower end of each jaw mesh with the planar thread. When the small bevel gear is rotated, the large bevel gear rotates accordingly, and the planar thread of the large bevel gear causes the three jaws to move closer to or away from the center at the same time. The internal grinding mechanism is used to grind the sealing surface of the manhole. The internal grinding mechanism includes a base, a grinding disc, a laser rangefinder, an electric lifting platform, and a rotating column. The chassis base is fixedly connected to the large bevel gear of the chuck clamping mechanism to support the internal grinding mechanism; the grinding disc is bolted to the chassis base to contact and grind the manhole sealing surface; the grinding disc has multiple countersunk holes, each containing a laser rangefinder to measure the distance between the grinding disc and the manhole sealing surface; the electric lifting platform is installed below the grinding disc to adjust the distance and pressure between the grinding disc and the manhole sealing surface. The device also includes multiple electric sandpaper tables; each electric sandpaper table includes sandpaper, a support, a rotary motor, and two rotary drums. In each electric sandpaper table, one drum is mounted on the inside of the grinding disc via a bracket, and the other drum is mounted on the outside of the grinding disc via a bracket. The sandpaper is wound in rolls around the two drums. One end of each drum is connected to a drum motor. When the sandpaper needs to be replaced, the drum motor drives the two drums to rotate in the same direction, so that the old sandpaper is rolled into one drum and the new sandpaper is rolled out from the other drum and laid flat on the surface of the grinding disc.

2. The apparatus according to claim 1, characterized in that, The electric lifting platform includes a lifting motor, a lead screw, and a slider. The lifting motor drives the lead screw to rotate, causing the slider to move up and down along the lead screw, thereby driving the grinding disc to move up and down.

3. The apparatus according to claim 1, characterized in that, The base is a disc with a short central cylinder. The rotating column is connected to the central cylinder of the base by a thread. The rotating motor drives the rotating column to rotate, thereby driving the base and the grinding disc to rotate.

4. The apparatus according to claim 1, characterized in that, Multiple rollers are installed at the lower end of the chassis base and slide to the upper surface of the electric lifting platform.

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