Polishing and grinding device and polishing and grinding method for outer surface of nuclear power pipe for steam generator

Abstract

The invention discloses a nuclear power pipe outer surface polishing and grinding device for a steam generator and a polishing and grinding method, and belongs to the technical field of polishing and grinding equipment.The nuclear power pipe outer surface polishing and grinding device for the steam generator comprises three sets of polishing and grinding mechanisms, each polishing and grinding mechanism comprises a supporting plate installed in a sound insulation cover, and a cover door is hinged to the sound insulation cover; the polishing and grinding mechanism further comprises a pipe supporting assembly, a cooling assembly, a polishing and grinding assembly and a driving assembly. According to the polishing and grinding assembly, the grinding wheel shaft and the multiple grinding wheel pieces are arranged, a traditional belt type grinding mode is replaced, and the problems that an abrasive belt is frequently replaced, the surface quality of the first batch of nuclear power pipes ground after the abrasive belt is newly replaced is poor, and the pressure during grinding cannot be set to be too large are solved; the air guide groove and the air outlet hole in the grinding wheel shaft are communicated with the grinding wheel air outlet of the grinding wheel piece, air conveyed by the driving assembly makes contact with the grinding wheel piece through the path, the temperature of the grinding wheel piece is reduced through air flowing, and the service life of the grinding wheel piece is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of polishing equipment, and in particular relates to a polishing device and a polishing method for the outer surface of a nuclear power tube used in a steam generator. Background Art

[0002] Steam generators are crucial equipment connecting the primary and secondary circuits of nuclear power plants. The heat transfer tubes used within them are a crucial barrier, isolating the primary and secondary sides and preventing the leakage of radioactive materials. This requires excellent corrosion resistance. TT treatment (solution treatment followed by isothermal treatment at a specific temperature) of 690 alloy heat transfer tubes used in steam generators increases the chromium content near the grain boundaries, thereby improving the alloy's corrosion resistance. Straightening can cause significant cold work hardening in the shallow layers of the outer wall of nuclear power tubes. If isothermal treatment is performed directly after straightening, a fine-grained layer may develop on the outer wall, compromising corrosion resistance. Polishing the outer wall of nuclear power tubes before isothermal treatment to remove this shallow, localized plastic deformation layer can effectively prevent fine graining after TT treatment.

[0003] The surface quality of nuclear power tubes is also a key factor affecting their corrosion resistance. Research has shown that polishing significantly reduces the rate of intergranular corrosion in steam generator heat transfer tubes. Furthermore, thickness measurement of pressure pipes has long been a key component of regular pipeline inspections. Polishing of nuclear power tubes reduces surface roughness, facilitating more accurate thickness measurement results.

[0004] The most commonly used surface polishing method is belt grinding, as shown in the figure of the specification. Figure 12 As shown in the figure, when the nuclear power tube passes through the abrasive belt, the transmission roller drives the pressure roller to rotate and grind the nuclear power tube. However, the belt grinding method has the following disadvantages: First, a lot of heat is generated during grinding, which causes the abrasive belt to wear out quickly and requires frequent belt replacement, which seriously reduces production efficiency. Second, the surface quality of the first batch of nuclear power tubes ground after the new belt was replaced was poor due to the relatively rough abrasive belt. Third, there are unfavorable factors such as the generation of large amounts of dust and high noise during the production process; Fourth, in belt grinding, only the abrasive belt is partially in contact with the nuclear power tube, and the pressure during grinding cannot be set too high. For nuclear power tubes with a specific outer diameter removal amount, multiple grindings are required, resulting in low processing efficiency. Summary of the Invention

[0005] The present invention aims to provide an outer surface polishing device and method for nuclear power tubes used in steam generators, which are used to solve the technical problems of the belt grinding method in the prior art. The belt grinding method generates a large amount of heat during grinding, causing the sanding belt to wear rapidly, requiring frequent replacement of the sanding belt, and seriously reducing production efficiency. Due to the relatively rough sanding belt, the surface quality of the first batch of nuclear power tubes ground after the new sanding belt is replaced is poor. The production process also has unfavorable factors such as the generation of a large amount of dust and high noise. In the belt grinding method, only the sanding belt contacts the nuclear power tube partially, and the pressure during grinding cannot be set too high. For nuclear power tubes with a specific outer diameter removal amount, multiple grindings are required, resulting in low processing efficiency.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A device for polishing the outer surface of a nuclear power tube for a steam generator comprises three sets of polishing mechanisms, wherein the polishing mechanism comprises a support plate installed in a soundproof cover, and a cover door is hinged on the soundproof cover. The polishing mechanism further comprises: a trustee assembly installed on the top surface of the support plate, for supporting the nuclear power tube; a cooling assembly located below the trustee assembly, for cooling the nuclear power tube; a polishing assembly located above the trustee assembly, comprising: a grinding wheel shaft, which has an air guide groove provided therein, and a plurality of air outlet holes connected to the air guide grooves on its surface; a plurality of grinding wheel parts, all installed on the grinding wheel shaft, for polishing the nuclear power tube, the grinding wheel parts having a grinding wheel air outlet, and the grinding wheel air outlet being connected to the air outlet hole; a driving assembly, for driving the polishing assembly to operate and to deliver air to the grinding wheel shaft.

[0007] Preferably, the polishing assembly also includes: a plurality of chucks, which are slidably mounted on the grinding wheel shaft; two locking rings, respectively threadedly connected to the two ends of the grinding wheel shaft; a plurality of limit blocks, respectively installed on the plurality of chucks; the grinding wheel part includes: a sleeve, which is slidably connected to the grinding wheel shaft, and the grinding wheel air outlet is opened on the sleeve; a slot, which is opened on the sleeve and matches the limit block; and a plurality of grinding wheel blades, which are equidistantly installed on the outer surface of the sleeve.

[0008] Preferably, the drive assembly includes: a second hydraulic cylinder, mounted on the inner wall of the soundproof cover, with a mounting block mounted on its extended end; a first mounting platform, fixedly connected to the mounting block via a first mounting plate, with a driving component mounted inside, the driving component being used to drive the grinding wheel shaft to rotate; a first hydraulic cylinder, mounted on the side of the mounting block, with a second mounting plate mounted on its extended end; a second mounting platform, fixedly connected to the second mounting plate, for cooperating with the first mounting platform to clamp the nuclear power tube; a high-pressure fan, mounted on the outer surface of the soundproof cover, with its outlet pipe extending into the soundproof cover, and the outlet pipe passing through the second mounting platform, and the outlet pipe of the high-pressure fan is a bellows.

[0009] Preferably, the cooling component includes: a water pump, installed on the outer surface of the sound insulation cover; a delivery pipe, which passes through one side of the sound insulation cover, is a hollow structure and has an opening at one end, and the open end of the delivery pipe is connected to the water pump; and multiple nozzles are installed on the delivery pipe.

[0010] Preferably, the polishing mechanism further includes: a controller installed on one side of the soundproof cover; multiple sets of guide rails, all installed on the top surface of the support plate; a dust baffle located above the support plate, with multiple exhaust pipes installed on its bottom surface, the middle of which is low and the two sides are high, and multiple through grooves are installed on it.

[0011] Preferably, the hosting component includes: two horizontal plates, each of which is equipped with a plurality of mounting seats, the plurality of mounting seats respectively pass through a plurality of through slots, and the plurality of mounting seats are respectively slidably connected to a plurality of guide rails; and a plurality of transmission wheels, which are respectively rotatably mounted on the mounting seats.

[0012] Preferably, the polishing mechanism also includes: two noise reduction guide sleeves, both of which are installed through the side of the sound insulation cover to absorb the noise generated by polishing; an adjustment component for adjusting the distance between the two horizontal plates; and a dust removal component, which is covered on the polishing component.

[0013] Preferably, the adjustment assembly includes: two fixed blocks, both fixedly connected to the support plate; a threaded rod, rotatably connected to the two fixed blocks, with threads at both ends thereof set in opposite directions, passing through the two horizontal plates and threadedly connected to the two horizontal plates; a handle, fixedly connected to one end of the threaded rod; the dust removal assembly includes: a dust removal hood, the hood is provided on the polishing assembly, and a dust removal pipe is connected to the top of the dust removal fan; a dust removal fan, installed on the top surface of the sound insulation hood, and the dust removal pipe is slidably plugged into the exhaust pipe of the dust removal fan.

[0014] Preferably, it further comprises: three laser diameter gauges, which are respectively installed on the left sides of the three groups of polishing mechanisms and are used to measure the thickness of the nuclear power tube.

[0015] A polishing method for a nuclear power tube outer surface polishing device for a steam generator comprises the following steps: Step 1: According to the outer diameter removal requirement of the nuclear power tube, an initial pressure range is set for the grinding wheel members in three groups of polishing mechanisms, wherein the pressure range is set to 20% to 80% of the maximum polishing pressure; Step 2: Using a laser diameter gauge arranged on the left side of each polishing mechanism, the average outer diameter value of the nuclear power tube before entering each polishing mechanism and after polishing is sequentially recorded, and the data is transmitted to an outer diameter value storage module; Step 3: The outer diameter value storage module compares two adjacent recorded outer diameter values, calculates the outer diameter removal amount between adjacent polishing mechanisms, and compares the removal amount with a preset outer diameter removal requirement range; Step 4: According to the difference between the outer diameter removal amount and the preset range, the pressure control module dynamically adjusts the pressure of the grinding wheel members of subsequent polishing mechanisms on the nuclear power tube, as well as the compressed air pressure, cooling water flow rate, and dust removal wind force.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. The polishing assembly of the present invention replaces the traditional belt grinding method by providing a grinding wheel shaft and multiple grinding wheel parts, thereby solving the problems of frequent replacement of grinding belts, poor surface quality of the first batch of nuclear power tubes ground after the new grinding belts are replaced, and the pressure cannot be set too high during grinding. The air guide grooves and air outlet holes in the grinding wheel shaft are connected to the grinding wheel air outlet of the grinding wheel part. The air delivered by the driving assembly contacts the grinding wheel part through this path, and the temperature of the grinding wheel part is reduced by air flow, thereby extending the service life of the grinding wheel part.

[0017] 2. The cooling component of the present invention is equipped with a water pump, a delivery pipe and a nozzle. The cooling component can spray water to the nuclear power tube to reduce the temperature of the nuclear power tube, effectively preventing the nuclear power tube from being deformed or damaged due to high temperature during the polishing process. At the same time, the water spraying also reduces dust flying.

[0018] 3. The present invention's steam generator nuclear power tube outer surface polishing device comprises a dust baffle, a dust removal assembly, a soundproof cover, and a noise-reduction guide sleeve. The dust baffle collects debris generated during polishing and water sprayed from the nozzle. The dust removal assembly uses a dust removal fan to draw dusty air through a dust removal pipe and dust removal cover and transports it to a filtration device. Simultaneously, the soundproof cover and noise-reduction guide sleeve absorb noise. This achieves effective dust collection and noise suppression during the polishing process, improving the working environment and reducing health risks to operators and pollution to the surrounding environment.

[0019] 4. The present invention's outer surface polishing device for nuclear power tubes used in steam generators employs three polishing mechanisms for graded polishing. The first polishing mechanism prioritizes large removal, the second mechanism maintains a stable removal rate, and the third mechanism maintains surface roughness. This achieves a step-by-step optimization process from coarse polishing to fine polishing, significantly improving polishing efficiency and final polishing quality. Furthermore, a laser diameter gauge collects outer diameter data of the nuclear power tubes before and after polishing in real time. An outer diameter value storage module calculates the outer diameter removal, and a pressure control module dynamically adjusts the pressure of subsequent polishing mechanisms by comparing it with a preset range. This avoids the multiple polishing cycles of traditional belt grinding, allowing a single process to meet specific outer diameter removal requirements, significantly improving processing efficiency. Furthermore, the removal rate is uniform across the entire nuclear power tube, reducing individual variations caused by manual adjustments and enhancing product consistency.

[0020] 5. The polishing method for the outer surface polishing device of nuclear power tubes for steam generators of the present invention links pressure regulation with the cooling and dust removal systems. When the pressure increases, the compressed air pressure of the high-pressure blower is simultaneously increased, thereby enhancing the cooling of the grinding wheel blades; the cooling water flow rate of the water pump is increased, thereby enhancing the cooling of the nuclear power tubes; and the wind force of the dust removal blower is increased to cope with more dust. When the pressure decreases, the intensity of each system is correspondingly reduced. This coordinated control not only avoids the accelerated wear of the grinding wheel parts caused by frictional overheating under high pressure, extends the service life of the grinding wheel, and reduces the replacement frequency; it also dynamically adjusts resource consumption according to actual operating conditions, avoids energy waste, and achieves energy-saving and efficient operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 A perspective view of the outer surface polishing device for nuclear power tubes used in steam generators according to the present invention; Figure 2 A three-dimensional diagram of the polishing mechanism of the present invention; Figure 3 Schematic diagram of the assembly structure of the dust baffle, adjustment component, cooling component and dust removal component in the present invention; Figure 4 Schematic diagram of the assembly structure of the dust baffle, hosting component and cooling component in the present invention; Figure 5 Schematic diagram of the assembly structure of the drive assembly and the grinding wheel shaft in the present invention; Figure 6This is a schematic diagram of the assembly structure of the grinding wheel shaft, chuck, air outlet and locking ring in the present invention; Figure 7 This is a schematic diagram of the assembly structure of the grinding wheel shaft and the air outlet in the present invention; Figure 8 A three-dimensional diagram of a grinding wheel according to the present invention; Figure 9 is a perspective view of the drive assembly of the present invention; Figure 10 Schematic diagram of the assembly structure of the inner layer structure, the core of the sound insulation cover and the outer shell of the sound insulation cover in the present invention; Figure 11 Schematic diagram of the assembly structure of the dust removal cover, dust removal pipe, dust removal fan and drive assembly in the present invention; Figure 12 A schematic diagram of the belt grinding method described in the background of the present invention; Figure numerals: 100, soundproof cover; 101, cover door; 102, handle; 1001, inner structure of soundproof cover; 1002, core of soundproof cover; 1003, outer shell of soundproof cover; 104, noise reduction guide sleeve; 105, controller; 111, support plate; 112, support leg; 113, guide rail; 121, dust baffle; 122, discharge pipe; 123, through groove; 130, hosting assembly; 131, horizontal plate; 132, mounting seat; 133, transmission wheel; 140, adjustment assembly; 141, fixing block; 142, threaded rod; 143, handle; 150, cooling assembly; 151, water pump; 152, delivery pipe; 153, nozzle; 160, spraying Grinding assembly; 161, grinding wheel shaft; 162, chuck; 163, air outlet; 164, locking ring; 165, limit block; 166, grinding wheel part; 1661, sleeve; 1662, slot; 1663, grinding wheel blade; 1664, grinding wheel air outlet; 170, drive assembly; 171, mounting block; 172, first mounting plate; 173, first mounting platform; 174, drive component; 175, first hydraulic cylinder; 176, second mounting plate; 177, second mounting platform; 178, high-pressure fan; 179, second hydraulic cylinder; 180, dust removal assembly; 181, dust removal hood; 182, dust removal pipe; 183, dust removal fan; 200, laser diameter gauge. DETAILED DESCRIPTION

[0023] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of the specific embodiments of the present invention is given in conjunction with the accompanying drawings. It is obvious that the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in this field without creative work should fall within the scope of protection of the present invention.

[0024] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0025] Secondly, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive of other embodiments.

[0026] The present invention is described in detail with reference to the accompanying drawings. When describing embodiments of the present invention, cross-sectional views illustrating device structures may be partially enlarged and not to scale for ease of illustration. Furthermore, the accompanying drawings are merely illustrative and should not limit the scope of protection of the present invention. Furthermore, in actual production, three-dimensional dimensions, including length, width, and depth, should be included.

[0027] At the same time, in the description of the present invention, it should be noted that the terms "first, second or third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0028] In this disclosure, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly. For example, they may refer to fixed, removable, or integral connections. They may also refer to mechanical, electrical, or direct connections, indirect connections through an intermediary, or internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this disclosure.

[0029] Example 1: Figure 1-Figure 5 and Figure 9 As shown, a device for polishing the outer surface of a nuclear power tube for a steam generator includes three groups of polishing mechanisms arranged in sequence from left to right. The polishing mechanism includes a support plate 111 installed in a soundproof cover 100, and a cover door 101 is hinged on the soundproof cover 100. The polishing mechanism also includes a hosting assembly 130, a cooling assembly 150, a polishing assembly 160 and a drive assembly 170.

[0030] The trustee assembly 130 is mounted on the top surface of the support plate 111 and is used to support the nuclear power tube. The cooling assembly 150 is located below the trustee assembly 130 and is used to cool the nuclear power tube. The polishing assembly 160 is located above the trustee assembly 130 and includes a grinding wheel shaft 161 and multiple grinding wheel components 166. The grinding wheel shaft 161 is provided with an air guide groove inside, and the surface of the grinding wheel shaft 161 is provided with multiple air outlet holes 163 connected to the air guide groove. The multiple grinding wheel components 166 are all mounted on the grinding wheel shaft 161 and are used to polish the nuclear power tube. The grinding wheel components 166 are provided with a grinding wheel air outlet 1664, which is connected to the air outlet hole 163.

[0031] The driving assembly 170 is used to drive the polishing assembly 160 to operate and to supply air into the grinding wheel shaft 161 .

[0032] Specifically, when polishing a nuclear power tube, the tube is placed on the tube holder assembly 130, and the drive assembly 170 is activated to drive the polishing assembly 160 to polish the tube. Simultaneously, the cooling assembly 150 is activated to spray water onto the tube to reduce its temperature. The sprayed water also reduces dust.

[0033] When the drive assembly 170 drives the polishing assembly 160 to operate, the drive assembly 170 can also supply air to the grinding wheel shaft 161. The air in the grinding wheel shaft 161 will contact the grinding wheel part 166 through the grinding wheel air outlet 1664 and the air outlet 163, thereby reducing the temperature of the grinding wheel part 166 and increasing the service life of the grinding wheel part 166.

[0034] like Figure 5-Figure 8 As shown, the polishing assembly 160 further includes a plurality of chucks 162, two locking rings 164, and a plurality of limit blocks 165. The plurality of chucks 162 are slidably mounted on the grinding wheel shaft 161; the two locking rings 164 are respectively threadedly connected to both ends of the grinding wheel shaft 161; and the plurality of limit blocks 165 are respectively mounted on the plurality of chucks 162. Grinding wheel assembly 166 includes a sleeve 1661, a slot 1662, and several grinding wheel blades 1663. Sleeve 1661 is slidably connected to grinding wheel shaft 161, with a grinding wheel air outlet 1664 defined on sleeve 1661. Slot 1662 is defined on sleeve 1661 and mates with stop block 165. Several grinding wheel blades 1663 are equidistantly mounted on the outer surface of sleeve 1661.

[0035] Specifically, during installation, a grinding wheel piece 166 is first sleeved on the grinding wheel shaft 161, and then a chuck 162 is sleeved on the grinding wheel shaft 161, and the limit block 165 on the grinding wheel piece 166 is plugged into the slot 1662 on the chuck 162, and then a grinding wheel piece 166 and a chuck 162 are sleeved on the grinding wheel shaft 161. As needed, multiple grinding wheel pieces 166 and multiple chucks 162 are installed on the grinding wheel shaft 161 (the number of chucks 162 will be one less than the number of grinding wheel pieces 166). Then, the position of the grinding wheel piece 166 is adjusted so that the air outlet 163 is connected to the grinding wheel air outlet 1664. After completion, the two locking rings 164 are threadedly connected to the grinding wheel shaft 161, so that the two locking rings 164 clamp the multiple grinding wheel pieces 166 and the multiple chucks 162, so that the grinding wheel piece 166 can rotate synchronously with the grinding wheel shaft 161.

[0036] At this time, if air is blown into the grinding wheel shaft 161 , the air will be blown toward the grinding wheel blades 1663 through the grinding wheel air outlet 1664 and the air outlet hole 163 .

[0037] like Figure 9 As shown, the drive assembly 170 includes a second hydraulic cylinder 179, a first mounting platform 173, a first hydraulic cylinder 175, a second mounting platform 177, and a high-pressure blower 178. The second hydraulic cylinder 179 is mounted on the inner wall of the soundproof enclosure 100, and a mounting block 171 is mounted on the extended end of the second hydraulic cylinder 179. The first mounting platform 173 is fixedly connected to the mounting block 171 via a first mounting plate 172. A drive component 174 is installed within the first mounting platform 173. The drive component 174 is used to drive the grinding wheel shaft 161 to rotate. The drive component 174 can adopt existing solutions in the prior art.

[0038] The first hydraulic cylinder 175 is installed on the side of the mounting block 171, and a second mounting plate 176 is installed on the extended end of the first hydraulic cylinder 175; the second mounting platform 177 is rotatably connected to the second mounting plate 176, and the second mounting platform 177 is used to cooperate with the first mounting platform 173 to clamp the nuclear power tube; the high-pressure fan 178 is installed on the outer surface of the sound insulation cover 100, and the air outlet pipe of the high-pressure fan 178 extends into the sound insulation cover 100, and the air outlet pipe of the high-pressure fan 178 passes through the second mounting platform 177 and is rotatably connected to the second mounting platform 177. The air outlet pipe of the high-pressure fan 178 is a plastic corrugated pipe, and the air outlet pipe can be moved relative to the high-pressure fan 178.

[0039] Specifically, by starting the first hydraulic cylinder 175, the distance between the first mounting plate 172 and the second mounting plate 176 is adjusted, and then the distance between the first mounting platform 173 and the second mounting platform 177 is adjusted, so that the first mounting platform 173 and the second mounting platform 177 cooperate to clamp the grinding wheel shaft 161, so that the driving component 174 can drive the grinding wheel shaft 161 to rotate. When the driving component 174 is running, it can drive the grinding wheel shaft 161 to rotate, and then drive the grinding wheel component 166 to rotate.

[0040] By setting up the second hydraulic cylinder 179, the height of the mounting block 171, the first mounting plate 172, the first hydraulic cylinder 175, the second mounting plate 176, the first mounting platform 173 and the second mounting platform 177 can be adjusted, thereby adjusting the height of the polishing assembly 160, thereby improving the applicability of the device.

[0041] like Figure 4 As shown, the cooling assembly 150 includes a water pump 151, a delivery pipe 152, and a plurality of nozzles 153. The water pump 151 is mounted on the outer surface of the soundproof enclosure 100; the delivery pipe 152 passes through one side of the soundproof enclosure 100. The delivery pipe 152 is a hollow structure with one end open, and the open end of the delivery pipe 152 is connected to the water pump 151; the plurality of nozzles 153 are mounted on the delivery pipe 152.

[0042] Specifically, by connecting the water pump 151 to an external water source, when polishing the nuclear power tube, the water pump 151 is started to transport water into the delivery pipe 152, and then the water is sprayed on the nuclear power tube through multiple nozzles 153, thereby facilitating cooling of the nuclear power tube.

[0043] like Figure 3 and Figure 4 As shown, the polishing mechanism also includes a controller 105, multiple sets of guide rails 113, and a dust baffle 121. The controller 105 is mounted on one side of the soundproof enclosure 100; the multiple sets of guide rails 113 are mounted on the top surface of the support plate 111. The dust baffle 121 is located above the support plate 111. Multiple discharge pipes 122 are installed through the bottom surface of the dust baffle 121. The dust baffle 121 is low in the middle and high on both sides. Multiple through-slots 123 are formed through the dust baffle 121. The dust baffle 121 is used to collect the debris dropped during polishing and the water sprayed by the nozzle 153. The debris and water are discharged through the discharge pipes 122.

[0044] like Figure 4As shown, the hosting assembly 130 includes two horizontal plates 131 and multiple transmission wheels 133. Both horizontal plates 131 are slidably connected to the top surfaces of the multiple sets of guide rails 113. Multiple mounting blocks 132 are mounted on each horizontal plate 131. Each mounting block 132 extends through multiple through slots 123 and is slidably connected to the multiple sets of guide rails 113. Multiple transmission wheels 133 are rotatably mounted on the mounting blocks 132. The transmission wheels 133 are tilted. When a nuclear power tube is placed on the transmission wheels 133, the angle between the transmission wheels 133 and the tube is 75 degrees.

[0045] Specifically, by providing the transmission wheel 133 , the nuclear power tube can be supported without affecting the rotation of the nuclear power tube.

[0046] like Figure 3 and Figure 11 As shown, the polishing mechanism also includes two noise reduction guide sleeves 104, an adjustment assembly 140, and a dust removal assembly 180. The two noise reduction guide sleeves 104 are installed through the side of the soundproof cover 100 to absorb the noise generated by polishing. The noise reduction guide sleeves 104 can adopt existing solutions in the prior art. The adjustment assembly 140 is used to adjust the distance between the two cross plates 131. The dust removal assembly 180 is mounted on the polishing assembly 160.

[0047] The adjustment assembly 140 includes two fixed blocks 141, a threaded rod 142 and a handle 143. The two fixed blocks 141 are fixedly connected to the support plate 111; the threaded rod 142 is rotatably connected to the two fixed blocks 141, and the threads at both ends of the threaded rod 142 are set in opposite directions. The threaded rod 142 passes through the two horizontal plates 131 and is threadedly connected to the two horizontal plates 131; the handle 143 is fixedly connected to one end of the threaded rod 142.

[0048] Specifically, since the threads at both ends of the threaded rod 142 are arranged in opposite directions, when the threaded rod 142 rotates, the two transverse plates 131 will move in opposite directions at the same time, or move in opposite directions at the same time.

[0049] According to the different diameters of nuclear power tubes, the handle 143 is rotated to drive the threaded rod 142 to rotate, thereby adjusting the distance between the two horizontal plates 131 and the distance between the relative transmission wheels 133, so that multiple transmission wheels 133 can adapt to nuclear power tubes of different diameters.

[0050] Furthermore, when the threaded rod 142 rotates, the two transverse plates 131 move simultaneously, thereby ensuring that the center of the nuclear power tube remains unchanged and the polishing position of the polishing assembly 160 on the nuclear power tube remains unchanged.

[0051] like Figure 3 and Figure 11As shown, the dust removal assembly 180 includes a dust removal cover 181 and a dust removal fan 183. The dust removal cover 181 is mounted on the polishing assembly 160, and a dust removal pipe 182 is connected to the top of the dust removal cover 181; the dust removal fan 183 is installed on the top surface of the soundproof cover 100, and the dust removal pipe 182 is slidably connected to the exhaust pipe of the dust removal fan 183.

[0052] Specifically, by connecting the air outlet pipe of the dust removal fan 183 to the external filtering device, when in use, by starting the dust removal fan 183, the dust air generated by polishing can be absorbed through the dust removal pipe 182 and the dust removal hood 181, and the dust air can be transported to the filtering device.

[0053] like Figure 10 As shown, the soundproof enclosure 100 and the enclosure door 101 are both composed of an inner structure of the soundproof enclosure 100, a core of the soundproof enclosure 100, and an outer shell of the soundproof enclosure 100. The inner structure of the soundproof enclosure 100 is an inner diamond structure, the core of the soundproof enclosure 100 is made of soundproof felt, and the outer shell of the soundproof enclosure 100 is made of metal. A handle 102 is installed on the enclosure door 101.

[0054] Specifically, the inner diamond structure can consume and absorb noise and reduce noise transmission. The core of the soundproof cover 100 is soundproof felt, forming a sound absorption and sound insulation composite structure, which effectively reduces noise transmission.

[0055] like Figure 1 and Figure 2 As shown, a nuclear power tube outer surface polishing device for steam generators further includes three laser diameter gauges 200, which are respectively installed on the left side of each polishing mechanism; and are used to measure the thickness of the nuclear power tube.

[0056] The polishing mechanism works as follows: First, according to the diameter of the nuclear power tube, the handle 143 is rotated, driving the threaded rod 142 to rotate, thereby adjusting the distance between the two horizontal plates 131, and thus the distance between the opposing transmission wheels 133, so that the multiple transmission wheels 133 can accommodate nuclear power tubes of the specified diameter. The nuclear power tube to be polished is then placed on the multiple transmission wheels 133.

[0057] Then, the air outlet pipe of the dust removal fan 183 is connected to the external filtering device, and the water suction pipe of the water pump 151 is connected to the external water source.

[0058] Then, by starting the driving component 174, the grinding wheel shaft 161 is driven to rotate, and the grinding wheel member 166 is driven to rotate, so that the grinding wheel blades 1663 on the grinding wheel member 166 polish the nuclear power tube.

[0059] During polishing, the high-pressure blower 178, the dust removal blower 183, and the water pump 151 are started. When the high-pressure blower 178 is running, air is blown into the grinding wheel shaft 161. The air is blown toward the grinding wheel blades 1663 through the grinding wheel air outlet 1664 and the air outlet 163, thereby cooling the grinding wheel blades 1663. When the dust removal fan 183 is running, dusty air generated by polishing can be sucked in through the dust removal pipe 182 and the dust removal cover 181, and the dusty air can be transported to the filtering device.

[0060] When the water pump 151 is running, the water pump 151 will transport water into the delivery pipe 152, and then spray the water on the nuclear power tubes through multiple nozzles 153, thereby facilitating cooling of the nuclear power tubes, and the sprayed water can also reduce dust flying.

[0061] Furthermore, since the multi-layered soundproof cover 100 is provided, the noise generated by polishing can be consumed and absorbed, thereby reducing the noise transmission.

[0062] The working principle of the outer surface polishing device for nuclear power tubes used in steam generators is as follows: the nuclear power tube to be polished is first placed in the polishing mechanism on the far left for polishing. After the initial polishing is completed, the nuclear power tube is inserted into the polishing mechanism in the middle for polishing. After the second polishing is completed, the nuclear power tube is inserted into the polishing mechanism on the far right for polishing. By polishing the nuclear power tube three times, the final polishing effect can be guaranteed.

[0063] Example 2: Figures 1-11 As shown, before polishing, a pressure is set for the grinding wheel 166 in each of the three polishing mechanisms. Based on the required outer diameter removal, the pressure is set between 20% and 80% of the maximum polishing pressure, and the rotational speed is set between 500 and 2500 rpm. The pressure mentioned here refers to the pressure exerted by the grinding wheel 166 on the nuclear power tube. This pressure is adjusted by adjusting the height of the drive assembly 170 via the second hydraulic cylinder 179, which in turn adjusts the height of the grinding wheel spindle 161 and the grinding wheel 166, thereby adjusting the pressure exerted by the grinding wheel 166 on the nuclear power tube.

[0064] First, a required range of outer diameter removal amount is set step by step in the controller 105; for ease of understanding, the three laser diameter gauges 200 are referred to as laser diameter gauge No. 1 200, laser diameter gauge No. 2 200 and laser diameter gauge No. 3 200 from left to right; the three groups of polishing mechanisms are referred to as the first polishing mechanism, the second polishing mechanism and the third polishing mechanism from left to right.

[0065] The nuclear power tube first passes through the No. 1 laser diameter gauge 200, and the No. 1 laser diameter gauge 200 will transmit the recorded average outer diameter value of the nuclear power tube as the outer diameter signal before polishing by the first polishing mechanism to the outer diameter value storage module.

[0066] The nuclear power tube enters the first polishing mechanism, is polished by the grinding wheel 166, and then removed from the first polishing mechanism. Simultaneously, it passes through the second laser caliper 200. The second laser caliper 200 records the average outer diameter of the nuclear power tube as the outer diameter signal before polishing by the second polishing mechanism, which is transmitted to the outer diameter value storage module. The outer diameter value storage module compares the outer diameter value before polishing by the first polishing mechanism with the outer diameter value before polishing by the second polishing mechanism input t seconds later. The outer diameter reduction value obtained by subtracting the two results is transmitted as the outer diameter reduction signal for the first polishing mechanism to the pressure control module. Here, t = distance between the two laser calipers 200 in seconds / nuclear power tube transmission speed v. The first polishing mechanism primarily produces large reductions, with a pressure range of 50% to 80% of the maximum polishing pressure.

[0067] The pressure control module subtracts the input outer diameter removal value of the first polishing mechanism from the required outer diameter removal range of the first polishing mechanism. If the subtraction result is less than the minimum value of the required range, the pressure control module sends a pressure increase signal to the drive assembly 170 of the first polishing mechanism and the second polishing mechanism. At the same time, the pressure control module sends a signal to increase the compressed air pressure, cooling water flow, and dust removal wind force to the corresponding equipment of the first polishing mechanism and the second polishing mechanism to ensure the cooling and dust removal effect of the grinding wheel 16 or nuclear power tube. On the contrary, if the result of subtraction from the minimum value of the required range is greater than 0, and the result of subtraction from the maximum value of the required range is greater than 0, a pressure reduction signal is sent to the drive assembly 170 of the first polishing mechanism and the second polishing mechanism, and at the same time, a signal is sent to the corresponding equipment of the first polishing mechanism and the second polishing mechanism to reduce the compressed air pressure, cooling water flow and dust removal wind force, which can save energy; if the result of subtraction from the minimum value of the required range is greater than 0, and the result of subtraction from the maximum value of the required range is less than 0, no signal is sent.

[0068] If the outer diameter reduction of the nuclear power tube head section passing through the first polishing mechanism exceeds or falls below the first polishing mechanism's required reduction, the second polishing mechanism, having received a signal from the pressure control module, preemptively increases or decreases the pressure of the grinding wheel 166 (the pressure exerted by the grinding wheel 166 on the nuclear power tube) to ensure uniform outer diameter reduction across the entire nuclear power tube. The second polishing mechanism primarily focuses on stabilizing the reduction across the entire tube, with a pressure range of 40% to 60% of the maximum polishing pressure.

[0069] A laser diameter gauge 200 is also provided on the right side of the second polishing mechanism (on the left side of the third polishing mechanism). The data recorded by the laser diameter gauge 200 is transmitted to the outer diameter value storage module as the outer diameter signal before polishing of the third polishing mechanism. The outer diameter value storage module compares the outer diameter value before polishing of the second polishing mechanism with the outer diameter value before polishing of the third polishing mechanism input after t seconds. The outer diameter removal value obtained by subtracting the two results is transmitted to the pressure control module as the outer diameter removal signal of the second polishing mechanism.

[0070] The pressure control module subtracts the input second polishing mechanism outer diameter reduction value from the second polishing mechanism outer diameter reduction range. If the result of the subtraction from the minimum value of the required range is less than 0, a pressure increase signal is sent to the drive assembly 170 of the second polishing mechanism and the third polishing mechanism, and a signal is simultaneously sent to the corresponding equipment of the second polishing mechanism and the third polishing mechanism to increase the compressed air pressure, cooling water flow rate, and dust removal wind force. Conversely, if the result of the subtraction from the minimum value of the required range is greater than 0 and the result of the subtraction from the maximum value of the required range is greater than 0, a pressure decrease signal is sent to the drive assembly 170 of the second polishing mechanism and the third polishing mechanism, and a signal is simultaneously sent to the corresponding equipment of the second polishing mechanism and the third polishing mechanism to decrease the compressed air pressure, cooling water flow rate, and dust removal wind force. If the result of the subtraction from the minimum value of the required range is greater than 0 and the result of the subtraction from the maximum value of the required range is less than 0, no signal is sent.

[0071] If the outer diameter reduction of the second polishing mechanism still does not meet the requirements, the third polishing mechanism will also adjust the pressure in advance. The third polishing mechanism is mainly used to ensure the outer surface roughness, and the pressure range is 20% to 40% of the maximum polishing pressure.

[0072] Among them, increasing / decreasing the compressed air pressure is accomplished by the high-pressure fan 178; increasing / decreasing the cooling water flow is accomplished by the water pump 151; and increasing / decreasing the dust removal wind force is accomplished by the dust removal fan 183.

[0073] The three sets of polishing mechanisms are independent of each other. When there is no requirement for the outer diameter removal of the nuclear power tube, only the No. 3 control system can be operated to ensure the outer surface roughness.

[0074] A polishing method for a nuclear power tube outer surface polishing device for a steam generator, comprising the following steps: Step 1: Based on the outer diameter reduction requirement of the nuclear power tube, an initial pressure range is set for the grinding wheel 166 in the three polishing mechanisms. The pressure range is set to 20% to 80% of the maximum polishing pressure. Among them, the grinding wheel pressure range of the first polishing mechanism is 50% to 80% of the maximum polishing pressure, the grinding wheel pressure range of the second polishing mechanism is 40% to 60% of the maximum polishing pressure, and the grinding wheel pressure range of the third polishing mechanism is 20% to 40% of the maximum polishing pressure. Step 2: Using the laser diameter gauge 200 located on the left side of each polishing mechanism, the average outer diameter of the nuclear power tube before and after entering each polishing mechanism is sequentially recorded, and the data is transmitted to the outer diameter value storage module. The nuclear power tube first passes through the No. 1 laser diameter gauge 200, and the recorded average outer diameter value serves as the outer diameter signal before polishing by the first polishing mechanism. After being polished by the first polishing mechanism, the nuclear power tube then passes through the No. 2 laser diameter gauge 200, and the recorded average outer diameter value serves as the outer diameter signal before polishing by the second polishing mechanism. Similarly, after being polished by the second polishing mechanism, the nuclear power tube passes through the laser diameter gauge 200 located to the right of the second polishing mechanism (left of the third polishing mechanism), and the recorded data serves as the outer diameter signal before polishing by the third polishing mechanism. Step 3: The outer diameter value storage module compares two adjacent recorded outer diameter values, calculates the outer diameter removal amount between adjacent polishing mechanisms, and compares the removal amount with a preset outer diameter removal amount requirement range, wherein the outer diameter value input after t seconds is subtracted from the outer diameter value input previously, where t is the time value obtained by dividing the distance s between the two laser diameter gauges 200 by the nuclear power tube transmission speed v; Step 4: The pressure control module dynamically adjusts the pressure of the grinding wheel 166 of the subsequent polishing mechanism on the nuclear power tube, as well as the compressed air pressure, cooling water flow rate and dust removal wind force according to the difference between the outer diameter removal amount and the preset range; If the outer diameter removal amount is less than the minimum value of the preset range, a pressure increase signal is sent to the drive assembly 170 of the subsequent polishing mechanism, and the compressed air pressure, cooling water flow and dust removal wind force are increased at the same time; If the outer diameter removal amount is greater than the maximum value of the preset range, a pressure reduction signal is sent to the drive assembly 170 of the subsequent polishing mechanism, and the compressed air pressure, cooling water flow and dust removal wind force are reduced at the same time; If the outer diameter removal is within the preset range, the pressure and parameters are not adjusted.

[0075] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

[0076] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A device for polishing the outer surface of a nuclear power tube for a steam generator, comprising three sets of polishing mechanisms, each of which comprises a support plate mounted in a soundproof enclosure, a door hingedly connected to the soundproof enclosure, and characterized in that: The polishing mechanism also includes: A hosting assembly, mounted on the top surface of the support plate, for supporting the nuclear power tube; A cooling component, located below the hosting component, for cooling the nuclear power tubes; A polishing assembly, located above the hosting assembly, includes: The grinding wheel shaft has an air guide groove inside and a plurality of air outlet holes connected to the air guide groove on its surface; A plurality of grinding wheel members are mounted on the grinding wheel shaft for grinding nuclear power tubes, and a grinding wheel air outlet is provided on the grinding wheel member, and the grinding wheel air outlet is connected to the air outlet hole; The driving assembly is used to drive the polishing assembly to operate and to supply air into the grinding wheel shaft.

2. The outer surface polishing device for nuclear power tubes for steam generators according to claim 1, characterized in that: The polishing assembly also includes: A plurality of chucks are slidably sleeved on the grinding wheel shaft; Two locking rings are respectively threadedly connected to the two ends of the grinding wheel shaft; A plurality of limit blocks are respectively installed on the plurality of chucks; The grinding wheel component comprises: A sleeve is slidably connected to the grinding wheel shaft, and the grinding wheel air outlet is opened on the sleeve; A slot is provided on the sleeve and matches the limit block; A plurality of grinding wheel blades are equidistantly mounted on the outer surface of the sleeve.

3. The outer surface polishing device for nuclear power tubes for steam generators according to claim 2, characterized in that: The drive assembly includes: a second hydraulic cylinder, mounted on the inner wall of the soundproof enclosure, with a mounting block mounted on an extended end thereof; A first mounting platform is fixedly connected to the mounting block via a first mounting plate, and a driving component is installed inside the first mounting platform, and the driving component is used to drive the grinding wheel shaft to rotate; a first hydraulic cylinder, mounted on the side of the mounting block, with a second mounting plate mounted on its extended end; a second mounting platform, fixedly connected to the second mounting plate, and configured to cooperate with the first mounting platform to clamp the nuclear power tube; A high-pressure blower is installed on the outer surface of the soundproof cover, and its air outlet pipe extends into the soundproof cover and passes through the second mounting platform. The air outlet pipe of the high-pressure blower is a corrugated pipe.

4. The outer surface polishing device for nuclear power tubes for steam generators according to claim 3, characterized in that: The cooling component comprises: a water pump mounted on the outer surface of the soundproof enclosure; A delivery pipe, which passes through one side of the soundproof cover and is a hollow structure with one end being open, wherein the open end of the delivery pipe is connected to a water pump; A plurality of nozzles are installed on the delivery pipe.

5. The outer surface polishing device for nuclear power tubes for steam generators according to claim 4, characterized in that: The polishing mechanism also includes: A controller is installed on one side of the soundproof enclosure; Multiple sets of guide rails are installed on the top surface of the support plate; The dust baffle is located above the supporting plate, and a plurality of discharge pipes are installed through the bottom surface of the dust baffle, which is low in the middle and high on both sides, and has a plurality of through grooves running through it.

6. The outer surface polishing device for nuclear power tubes for steam generators according to claim 5, characterized in that: The managed components include: Two horizontal plates, each of which is provided with a plurality of mounting seats, each of which passes through a plurality of through slots, and each of which is slidably connected to a plurality of guide rails; A plurality of transmission wheels are rotatably mounted on the mounting bases respectively.

7. The outer surface polishing device for nuclear power tubes for steam generators according to claim 6, characterized in that: The polishing mechanism also includes: Two noise reduction guide sleeves are installed on the side of the sound insulation cover to absorb the noise generated by polishing; An adjusting component, used for adjusting the distance between the two transverse plates; The dust removal component is covered on the polishing component.

8. The outer surface polishing device for nuclear power tubes for steam generators according to claim 7, characterized in that: The adjustment component includes: Two fixing blocks, both fixedly connected to the supporting plate; A threaded rod is rotatably connected to the two fixed blocks, with threads at both ends of the rod being arranged in opposite directions, and passes through the two horizontal plates and is threadedly connected to the two horizontal plates; a handle fixedly connected to one end of the threaded rod; The dust removal component includes: A dust removal cover is provided on the polishing assembly, and a dust removal pipe is connected to the top of the dust removal cover; The dust removal fan is installed on the top surface of the sound insulation cover, and the dust removal pipe is slidably plugged into the exhaust pipe of the dust removal fan.

9. The outer surface polishing device for nuclear power tubes for steam generators according to claim 8, characterized in that: Also includes: Three laser diameter gauges are respectively installed on the left side of the three groups of polishing mechanisms and are used to measure the thickness of the nuclear power tube.

10. A method for polishing the outer surface of a nuclear power tube for a steam generator, characterized in that: The following steps are involved: Step 1: According to the outer diameter removal requirement of the nuclear power tube, an initial pressure range is set for the grinding wheel parts in the three sets of polishing mechanisms. The pressure range is set at 20% to 80% of the maximum polishing pressure. Step 2: Using a laser diameter gauge located on the left side of each polishing mechanism, the average outer diameter of the nuclear power tube before and after entering each polishing mechanism is recorded in sequence, and the data is transmitted to the outer diameter value storage module; Step 3: The outer diameter value storage module compares the outer diameter values ​​recorded twice adjacently, calculates the outer diameter removal amount between adjacent polishing mechanisms, and compares the removal amount with the preset outer diameter removal amount requirement range; Step 4: The pressure control module dynamically adjusts the pressure of the grinding wheel of the subsequent polishing mechanism on the nuclear power tube, as well as the compressed air pressure, cooling water flow and dust removal wind force according to the difference between the outer diameter removal amount and the preset range.

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