Method and mold for detecting repair conditions of suction cover and impeller of circulating pump

Abstract

The invention relates to the technical field of pump repair, and discloses a method for detecting the repair condition of a suction cover and an impeller of a circulating pump. The method comprises the following steps: acquiring original three-dimensional models of a suction cover and an impeller of the factory circulating pump; based on the original three-dimensional model, constructing a detection mold model of the suction cover and the easy-to-wear surface of the impeller; based on a sand mold 3D printing technology, a detection mold for the easily-worn surfaces of the suction cover and the impeller is manufactured; the detection mold is adopted to observe and detect the repair conditions of the suction cover and the impeller after repair, and adjustment is carried out; and performing a dynamic balance test on the repaired impeller. According to the method, the repairing effect of the repaired suction cover and impeller of the circulating pump can be effectively detected, and the final repairing quality is guaranteed. In addition, the invention further discloses a mold for detecting the repairing conditions of the suction cover and the impeller of the circulating pump.

Description

Technical Field

[0001] The present invention relates to the field of pump repair technology, in particular to a method for detecting the repair status of a circulating pump suction cover and an impeller. In addition, the present invention also relates to a mold for detecting the repair status of a circulating pump suction cover and an impeller. Background Art

[0002] As the main equipment of the desulfurization system, the operating status of the circulating pump is extremely important. In daily operation and maintenance, the suction cover and impeller of the circulating pump are prone to corrosion and wear under the action of the slurry inside the absorption tower, resulting in changes in the outer dimensions of the suction cover and impeller, and ultimately causing a decrease in desulfurization efficiency. The suction cover and impeller need to be replaced to ensure the stable operation of the unit. However, due to the high price of the impeller, in order to reduce the investment in production costs and solve the production problems caused by corrosion and wear of the suction cover and impeller, in the existing technology, the damaged impeller of the circulating pump will be repaired and continued to be used.

[0003] However, due to limited conditions, the repaired suction cover and impeller are often difficult to approach the factory size. Generally, the repair is too thick, and the suction cover and impeller have complex structures. The detection means of the existing technology are difficult to conduct a full range of dimensional detection of the repaired suction cover and impeller, and it is impossible to determine whether the repair is up to standard, and thus it is impossible to ensure that the operating parameters of the repaired circulation pump are normal. As a result, it often happens that the repaired impeller and the suction cover have interference friction, or the repaired circulation pump has a current drop and a reduced output, so that when multiple circulation pumps in a unit have been repaired, normally only 3 circulation pumps are needed to maintain the export standard, but now 4 circulation pumps are needed, resulting in large production material expenditures and power losses. Summary of the invention

[0004] The technical problem to be solved by the present invention on one hand is to provide a method for detecting the repair status of the circulation pump suction cover and impeller, which can effectively detect the repair effect of the repaired circulation pump suction cover and impeller to ensure the final repair quality.

[0005] Another technical problem to be solved by the present invention is to provide a mold for detecting the repair status of the circulation pump suction cover and impeller. The mold can facilitate the detection of the repair status of the circulation pump suction cover and impeller, thereby improving the work efficiency and work quality of the circulation pump repair and maintenance.

[0006] In order to solve the above technical problems, the present invention provides, on the one hand, a method for detecting the repair status of the suction cover and impeller of a circulating pump, comprising the following steps: obtaining the original three-dimensional model of the suction cover and impeller of the factory circulating pump; based on the original three-dimensional model, constructing a detection mold model of the easily worn surfaces of the suction cover and the impeller; making a detection mold for the easily worn surfaces of the suction cover and the impeller based on sand mold 3D printing technology; using the detection mold to observe, detect and adjust the repair status of the repaired suction cover and the impeller; and performing a dynamic balance test on the repaired impeller.

[0007] Preferably, obtaining the original three-dimensional model of the suction cover and impeller of the factory circulating pump includes: three-dimensionally scanning the suction cover and the impeller, and obtaining point cloud data of the suction cover and the impeller; constructing the original three-dimensional model of the suction cover and the impeller based on the point cloud data; analyzing and adjusting the deviation between the data of the original three-dimensional model and the point cloud data.

[0008] Preferably, based on the original three-dimensional model, constructing the inspection mold model of the suction cover and the wear-prone surface of the impeller includes: based on the original three-dimensional models of the suction cover and the impeller, obtaining the inner contour line of the suction cover, the inner front end contour line of the impeller and the outer front end contour line of the impeller; based on the inner contour line of the suction cover, the inner front end contour line of the impeller and the outer front end contour line of the impeller, constructing the suction cover inner contour model, the impeller inner front end contour model and the impeller outer front end contour model with a thickness of 3-5mm; determining the overall structure of the sand core and the sand mold, including constructing and optimizing the suction cover inner contour sand mold, the impeller inner front end contour sand mold and the impeller outer front end contour sand mold.

[0009] More preferably, the suction cover internal contour sand mold includes a suction cover sand core, a suction cover upper sand mold and a suction cover lower sand mold, and the suction cover upper sand mold is provided with a suction cover gate penetrating the suction cover upper sand mold.

[0010] More preferably, the impeller outer front end contour sand mold includes an impeller outer front end sand core, an impeller outer front end upper sand mold and an impeller outer front end lower sand mold, and the impeller outer front end upper sand mold is provided with an impeller outer front end gate penetrating the impeller outer front end upper sand mold.

[0011] More preferably, the impeller inner front end contour sand mold includes an impeller inner front end sand core, an impeller inner front end upper sand mold and an impeller inner front end lower sand mold, and the impeller inner front end upper sand mold is provided with an impeller inner front end gate penetrating the impeller inner front end upper sand mold.

[0012] Preferably, using the inspection mold to observe, inspect and adjust the repair conditions of the suction cover and the impeller after repair includes: placing the inspection mold in the repair areas of the suction cover and the impeller to determine the initial repair conditions of the suction cover and the impeller; using macro inspection and inspection tool marking to confirm the specific repair conditions of each repair area of ​​the suction cover and the impeller; secondary adjustment and repair of the suction cover and the impeller based on the specific repair conditions; using macro inspection and non-destructive testing re-inspection to confirm that there are no crack defects in the repaired area.

[0013] Further preferably, judging the initial repair condition of the suction cover and the impeller includes: the detection mold interferes with the suction cover and the impeller, judging that the repaired suction cover and the impeller are too thick; or the detection mold has a large movement amount with the suction cover and the impeller, judging that the repaired suction cover and the impeller are too thin.

[0014] Specifically, macroscopic inspection and detection tool marking are used to confirm the specific repair conditions of the repair areas of the suction cover and the impeller, including: using a depth gauge to measure the distance between the outer surface of the repair area of ​​the suction cover and the impeller and the outer surface of the detection mold; judging the error between each distance and the preset distance, and marking the area with larger error.

[0015] On the other hand, the present invention also provides a mold for detecting the repair status of the suction cover and impeller of a circulating pump, including a suction cover detection mold for detecting the repair status of the suction cover and impeller matching area, an impeller inner front end detection mold for detecting the repair status of the impeller inner front end, and an impeller outer front end detection mold for detecting the repair status of the impeller outer front end. The suction cover detection mold, the impeller inner front end detection mold and the impeller outer front end detection mold are all provided with a plurality of through holes suitable for detection tools to probe into.

[0016] Through the above technical scheme, the method for detecting the repair status of the suction cover and impeller of the circulating pump provided by the present invention on one hand adopts 3D printing technology to make the detection mold sand mold, which can quickly manufacture sand molds and sand cores with complex shapes, shorten the manufacturing cycle, and have high manufacturing accuracy; the detection mold is compatible with the wear-prone surfaces of the suction cover and impeller of the circulating pump, and can display the contour shape of the wear-prone surfaces of the suction cover and impeller of the circulating pump shipped from the factory. When detecting the repaired suction cover and impeller, the suction cover and impeller can be repaired to the original state closest to the factory through the detection mold, avoiding the situation where friction is found between the suction cover and the impeller when the equipment is reinstalled later, or the current of the circulating pump is found to drop and the output is reduced during operation, and repeated disassembly, repair and testing are avoided, thereby improving the work efficiency and work quality during the maintenance of the circulating pump. On the other hand, the present invention provides a mold for detecting the repair condition of the circulation pump suction cover and impeller, whose inner contour surface, that is, the detection surface, perfectly fits with the easily worn surfaces of the suction cover and the impeller, and the mold is provided with a plurality of through holes. The repair condition of the suction cover and the impeller can be detected by placing the mold on the easily worn surfaces of the suction cover and the impeller, and it can be effectively determined whether the easily worn surfaces of the repaired suction cover and impeller are basically consistent with the contour of the detection surface of the mold. With the assistance of the mold, detecting the repair condition of the circulation pump suction cover and the impeller becomes simpler and more effective.

[0017] Other advantages of the present invention and the technical effects of the preferred embodiments will be further described in the following specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 It is a flow chart of a method for detecting the repair status of a circulation pump suction cover and an impeller according to the present invention;

[0020] Figure 2 It is a structural schematic diagram of a specific implementation mode of the internal contour sand mold of the suction cover of the present invention;

[0021] Figure 3 It is a structural schematic diagram of a specific implementation mode of the suction cover detection mold and the suction cover of the present invention;

[0022] Figure 4 It is a structural schematic diagram of a specific implementation mode of the impeller outer front end profile sand mold of the present invention;

[0023] Figure 5 It is a structural schematic diagram of a specific implementation mode of the impeller outer front end detection mold and the impeller of the present invention;

[0024] Figure 6It is a structural schematic diagram of a specific implementation method of the impeller inner front end profile sand mold of the present invention;

[0025] Figure 7 It is a structural schematic diagram of a specific implementation of the impeller inner front end detection mold of the present invention.

[0026] Description of Reference Numerals

[0027] 1-sand mold for inner contour of suction cover, 101-sand mold for lower suction cover, 102-sand core for suction cover, 103-sand mold for upper suction cover, 104-gate for suction cover, 2-sand mold for outer front end contour of impeller, 201-gate for outer front end of impeller, 202-sand core for outer front end of impeller, 203-sand mold for upper outer front end of impeller, 204-sand mold for lower outer front end of impeller, 3-sand mold for inner front end contour of impeller, 301-sand mold for upper inner front end of impeller, 302-sand core for inner front end of impeller, 303-gate for inner front end of impeller, 304-sand mold for lower inner front end of impeller, 4-intake cover detection mold, 5-impeller outer front end detection mold, 6-impeller inner front end detection mold, 7-suction cover, 8-outer front end of impeller, 9-inner front end of impeller. DETAILED DESCRIPTION

[0028] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0029] It should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "inside", "outside", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] It should be noted that the acquisition, transmission, storage, use, and processing of data in the technical solution of this application are in compliance with the relevant provisions of national laws and regulations. In the embodiments of this application, some existing solutions in the industry such as certain software, components, and models may be mentioned, which should be considered as exemplary. Their purpose is only to illustrate the feasibility of implementing the technical solution of this application, but it does not mean that the applicant has or will necessarily use the solution.

[0031] In a basic embodiment of the present invention, see Figure 1 , which is a flow chart of a method for detecting the repair status of a circulating pump suction cover and an impeller provided in an embodiment of the present invention, comprising the following steps:

[0032] Get the original 3D model of the suction cover and impeller of the factory circulation pump;

[0033] Based on the original 3D model, build the inspection mold model of the suction cover and impeller wear surface;

[0034] The inspection molds for the suction cover and impeller's easily worn surface are made based on sand mold 3D printing technology;

[0035] Use the inspection mold to observe and inspect the repaired suction cover and impeller and make adjustments;

[0036] Perform dynamic balancing test on the repaired impeller.

[0037] Specifically, the point cloud data of the factory circulating pump suction cover and impeller can be obtained by 3D scanning technology, and the editable solid model of the suction cover and impeller based on the feature can be created according to the point cloud data, that is, the original three-dimensional model of the suction cover and impeller. According to the detection requirements of the wearable surface of the suction cover and the impeller, the original three-dimensional model of the suction cover and the impeller is segmented, and the detection mold model of the wearable surface of the suction cover and the impeller is constructed. Sand cores are constructed based on the detection mold model of the suction cover and the impeller, and the pouring system of each detection mold sand mold is designed, and finally a three-dimensional model of each detection mold sand mold is constructed. The temperature field and flow field of the sand mold casting filling process and solidification process of each detection mold are analyzed, and the pouring system of each detection mold sand mold is optimized based on the analysis results. Sand mold 3D printing technology can be used to produce each detection mold sand mold. After the sand mold is assembled, a suitable casting material can be selected for casting. In this embodiment, resin materials, reinforced plastics or carbon fibers can be used. Such materials have the advantages of light weight, not easy to break and deform, wear resistance and corrosion resistance. After the pouring is completed, the sand mold is left to stand until the casting solidifies and forms, the box is disassembled, the molded casting is obtained, the excess pouring and riser parts are cut off, and the inspection molds of the suction cover and the wearable surface of the impeller are obtained. When it is necessary to repair and overhaul the suction cover and impeller of the circulating pump, the above-mentioned inspection molds can be used as acceptance inspection tools for qualified repair of the suction cover and impeller. The above-mentioned inspection molds are placed on the wearable surfaces of the suction cover and impeller after they are easily repaired. The repair status of the suction cover and impeller can be checked by macro inspection and inspection tools. Based on the inspection results, the repair surface of the suction cover and impeller is adjusted so that the outer contour of the repaired surface of the suction cover and impeller is basically consistent with the inspection surface of each inspection mold. Finally, the impeller can be dynamically balanced. For the off-balance amount, additional balancing treatment is performed to ensure the stable operation of the impeller.

[0038] In this embodiment, obtaining the original three-dimensional model of the suction cover and impeller of the factory circulation pump includes: three-dimensionally scanning the suction cover and impeller, and obtaining the point cloud data of the suction cover and impeller; constructing the original three-dimensional model of the suction cover and impeller based on the point cloud data; analyzing the deviation between the data of the original three-dimensional model and the point cloud data and adjusting it. Specifically, marking points can be pasted on the outer surface of the suction cover and the impeller, and each marking point can be avoided to be linear or in a row. Then, a handheld non-contact laser three-dimensional scanner can be used to scan the suction cover and impeller of the circulation pump to obtain the point cloud data of the suction cover and the impeller. The above point cloud data is preprocessed, and the preprocessing step mainly includes denoising, noise reduction and smoothing of the point cloud data. According to the processed point cloud data, the point cloud data is divided into regions, and the incorrect regions are modified to ensure that the same feature is in the same region. Then, the surface is fitted according to the divided regions, and the fitted surface is trimmed to obtain the feature contour, and the surface is trimmed by the contour line of the feature, and the trimmed surface is stitched to form a solid. Finally, small features such as holes, bosses and other regular features are fitted to obtain the original three-dimensional model of the suction cover and impeller. The original three-dimensional model data and point cloud data of the suction cover and impeller are analyzed for deviation to check whether they are within the tolerance range. Specifically, the original three-dimensional digital model of the suction cover and impeller and the scanned point cloud data of the suction cover and impeller can be used, the three-dimensional digital model is set as a reference, the point cloud data is set as a test, a three-dimensional comparison is performed, the maximum and minimum tolerances and the nominal tolerances are set, and the deviation size of the specific position is checked to evaluate whether the three-dimensional digital model is qualified. In this embodiment, the deviation between the point cloud denoised data and the three-dimensional data is not greater than 0.03mm to meet the use requirements.

[0039] In this embodiment, based on the original three-dimensional model, constructing the inspection mold model of the suction cover and the impeller includes: based on the original three-dimensional models of the suction cover and the impeller, obtaining the internal contour line of the suction cover, the inner front end contour line of the impeller and the outer front end contour line of the impeller; based on the internal contour line, the inner front end contour line and the outer front end contour line, constructing the suction cover internal contour model, the impeller inner front end contour model and the impeller outer front end contour model with a thickness of 3-5mm; establishing the overall structure of the sand core and the sand mold, and constructing and optimizing the suction cover internal contour sand mold, the impeller inner front end contour sand mold and the impeller outer front end contour sand mold.

[0040] Specifically, the contour line related to the easily worn surface of the suction cover can be selected in the original three-dimensional model of the suction cover. In this embodiment, it is the internal contour line of the suction cover, and the selected contour line content is used to create a graph, thereby easily extracting the internal contour line of the suction cover from the original three-dimensional model of the suction cover. In addition, the internal contour line of the suction cover can also be obtained based on the point cloud data model of the suction cover. The algorithm steps are mainly as follows: calculating the normal vector of the point on the point cloud model of the suction cover; constructing a Gaussian sphere and establishing a hierarchical data structure for data storage; based on parallel projection and perspective projection, recursively processing the visibility state judgment requirements of the corresponding nodes of each data unit on the hierarchical structure Gaussian sphere, marking all points that meet the requirements, and quickly obtaining the contour points of the easily worn surface of the suction cover; based on the contour points and their indexes in the original point cloud model, obtaining the contour point cloud model with the position information of the original points, and connecting the close points using the positional relationship between the points; obtaining smooth contour lines based on the minimum spanning tree method and the short edge pruning method. The above method of directly obtaining the contour line of the easily worn surface of the suction cover based on point cloud data reduces the steps of converting the point cloud model of the suction cover into a three-dimensional model and speeds up the extraction speed of the internal contour line of the suction cover. Regarding the contour line of the impeller's easily worn surface, in this embodiment, the method for extracting the inner front end contour line of the impeller and the outer front end contour line of the impeller is consistent with the method for extracting the contour line of the easily worn surface of the suction cover mentioned above, and no further details will be given here.

[0041] Based on the actual use requirements, on the basis of the internal contour line of the suction cover, a three-dimensional model of the internal contour of the suction cover with a thickness of 3-5mm is drawn and established. In the present embodiment, preferably, a suction cover internal contour model with a thickness of 3mm is selected, and the inner and outer contour surfaces of the suction cover internal contour model all contain the entire contour shape of the suction cover wear-prone surface. According to the shape characteristics and process requirements of the suction cover internal contour model, the casting material and casting system of the suction cover internal contour sand mold 1 are selected, and based on the shape of the suction cover internal contour model, a suitable sand core is designed, which is used to form a mold for the inner cavity or hole of the casting. In the present embodiment, the casting material is preferably resin, reinforced plastic, carbon fiber or other light weight, non-breakable and non-deformable, wear-resistant and corrosion-resistant material. The casting system can be selected as a stepped casting system. Based on the suction cover internal contour sand mold 1, the temperature field and velocity field of the casting filling process and solidification process are analyzed, and according to the analysis results, the shrinkage compensation system is optimized. Specifically, the three-dimensional model of the suction cover internal contour sand mold 1 can be exported to the STL format. According to the format file, the surface of the imported model is checked for interference and repaired, and then its surface mesh is divided. The divided surface mesh is checked and the damaged surface is manually repaired. The parameters of the casting simulation process of the suction cover detection mold are set, and the temperature field and flow field of the filling process and the solidification process are analyzed. After analysis, it is found that during the solidification process, the bending part of the suction cover detection mold cannot be effectively compensated. Therefore, the compensation system needs to be optimized. The solidification process of the optimized sand mold is simulated, and the simulation results show that the sequential solidification principle is met. The above-mentioned suction cover detection mold is a casting cast by the sand mold of the suction cover internal contour model. The selection of the casting material and the casting system of the impeller inner front end contour sand mold 3 and the impeller outer front end contour sand mold 2 are consistent with those of the above-mentioned suction cover, and the construction steps of the impeller inner front end contour sand mold 3 and the impeller outer front end contour sand mold 2 are consistent with those of the suction cover, which will not be repeated here. In addition to the sand mold used above, the present invention can also adopt a gypsum mold.

[0042] In this embodiment, see Figure 2The suction cover internal contour sand mold 1 includes a suction cover sand core 102, a suction cover upper sand mold 103 and a suction cover lower sand mold 101, and a suction cover gate 104 is provided in the suction cover upper sand mold 103. Specifically, in the inner cavity of the suction cover internal contour sand mold 1, the end with a larger radial dimension of the suction cover detection mold 4 is arranged on the upper end surface of the suction cover lower sand mold 101, and the end with a smaller radial dimension is arranged away from the upper end surface of the suction cover lower sand mold 101, so that the demolding efficiency of the suction cover detection mold 4 can be effectively guaranteed. The suction cover gate 104 is arranged in the suction cover upper sand mold 103 and is connected to the runner on the suction cover lower sand mold 101. The riser can be arranged on the runner, which can effectively improve the quality stability of thin-walled castings such as the suction cover detection mold 4 and reduce surface defects of the castings. Since the end with a larger inner diameter of the suction cover has a thin-walled bent portion, part of the suction cover sand core 102 is placed in the suction cover upper sand mold 103, and part is placed in the suction cover lower sand mold 101 to ensure that the sand core can effectively withstand the extrusion during the casting process and avoid affecting the casting cavity.

[0043] In this embodiment, see Figure 4 The impeller outer front end contour sand mold 2 includes an impeller outer front end upper sand mold 203, an impeller outer front end sand core 202 and an impeller outer front end lower sand mold 204. An impeller outer front end gate 201 is provided in the impeller outer front end upper sand mold 203. The impeller outer front end gate 201 is in a conical structure that is wide at the top and narrow at the bottom. The impeller outer front end sand core 202 is completely placed in the impeller outer front end lower sand mold 204. A plurality of risers are provided in the impeller outer front end upper sand mold 203.

[0044] In this embodiment, see Figure 6 The impeller inner front end profile sand mold 3 includes an impeller inner front end sand core 302, an impeller inner front end upper sand mold 301 and an impeller inner front end lower sand mold 304, and an impeller inner front end gate 303 is arranged in the impeller inner front end upper sand mold 301. Specifically, in the inner cavity of the impeller inner front end profile sand mold 3, the end of the impeller inner front end profile sand mold 3 with a larger radial dimension is arranged on the upper end surface of the impeller inner front end lower sand mold 304, and the end with a smaller radial dimension is arranged away from the upper end surface of the impeller inner front end lower sand mold 304, so that the demoulding efficiency of the impeller inner front end detection mold 6 can be effectively guaranteed. The impeller inner front end gate 303 is arranged in the impeller inner front end upper sand mold 301, and is connected to the runner on the impeller inner front end lower sand mold 304. The riser can be arranged on the runner, which can effectively improve the quality stability of thin-walled castings such as the impeller inner front end detection mold 6 and reduce surface defects of the casting. The impeller inner front end sand core 302 is completely placed in the impeller inner front end lower sand mold 304.

[0045] In this embodiment, the inspection mold is used to observe, inspect and adjust the repair condition of the suction cover and impeller after repair, including: placing the inspection mold in the repair area of ​​the suction cover and impeller to determine the initial repair condition of the suction cover and impeller; using macro inspection and inspection tool marking to confirm the specific repair condition of each repair area of ​​the suction cover and impeller; secondary adjustment and repair of the suction cover and impeller based on the specific repair condition; using macro inspection and non-destructive testing re-inspection to confirm that there are no crack defects in the repaired area. Specifically, the inspection mold can be placed in the suction cover and impeller. If the inspection mold interferes with the suction cover and impeller, it can be judged that the repair of the suction cover and impeller is too thick. If the inspection mold is completely placed in the suction cover and impeller, it is found that there is a large amount of movement between the inspection mold and the suction cover and impeller, and it can be judged that the repair of the suction cover and impeller is too thin. For the area where the repair is too thick, the area where the mold, the suction cover and the impeller produce friction marks can be detected through macroscopic observation, and marked by applying red lead powder; for the case where the repair is too thin, a detection tool can be used to measure the distance between the outer surface of the suction cover and impeller repair area and the outer surface of the detection mold, and the error between the distance and the preset distance can be determined. If the error is within the error range, the area is judged to be repaired properly. If the error is not within the error range, it can be marked by applying red lead powder for subsequent secondary repair processing. In this embodiment, the detection tool can be a depth gauge.

[0046] In this embodiment, judging the initial repair of the suction cover and the impeller includes: the detection mold interferes with the suction cover and the impeller, judging that the suction cover and the impeller are repaired too thick; or there is a large amount of movement between the detection mold and the suction cover and the impeller, judging that the suction cover and the impeller are repaired too thin. Specifically, when the detection mold is placed in the suction cover or the impeller, it is found that the detection mold is difficult to go deeper, indicating that the detection mold and the suction cover or the impeller have interfered, and it can be judged that the repair of the interference area is too thick. The area where the interference occurs can be found through macroscopic observation, and can be marked with a color marker pen, the detection mold is removed, and the marked area is polished so that the detection mold can pass through the marked area. Based on the above steps, the thicker area of ​​the suction cover or impeller after the detection mold is polished and repaired is continuously used, so that the detection mold can finally be completely placed in the suction cover or the impeller. When the detection mold can be completely placed in the suction cover or the impeller, the detection mold is moved in all directions, and it is found that the detection mold has a large amount of movement in the suction cover or the impeller, then it can be judged that the suction cover and the impeller are repaired too thin.

[0047] In this embodiment, macroscopic inspection and detection tool marking are used to confirm the specific repair conditions of each repair area of ​​the suction cover and the impeller, including: using a depth gauge to measure the distance between the outer surface of the repair area of ​​the suction cover and the impeller and the outer surface of the detection mold; judging the error between each distance and the preset distance, and marking the area with larger error. Specifically, the preset distance is the thickness of the detection mold plus the gap error between the detection mold and the suction cover and the impeller. In this embodiment, the thickness of the detection mold can be set to 3mm, and the gap error between the detection mold and the repaired suction cover 7 and the impeller is 1mm, then the preset distance is 4mm. The error between each distance and the preset distance can be within 1mm. For areas with larger errors, they can be marked and recorded with a color marker or red powder for subsequent inspection and repair.

[0048] See also Figure 3 , Figure 5 and Figure 7 In the embodiment of the present invention, a mold for detecting the repair of the suction cover and impeller of the circulation pump is also provided, including a suction cover detection mold 4 for detecting the repair of the suction cover 7 and the impeller matching area, an impeller inner front end detection mold 6 for detecting the repair of the impeller inner front end 9, and an impeller outer front end detection mold 5 for detecting the repair of the impeller outer front end 8. The suction cover detection mold 4, the impeller inner front end detection mold 6, and the impeller outer front end detection mold 5 are all provided with a plurality of through holes suitable for the detection tool to probe into. Specifically, the plurality of through holes on the suction cover detection mold 4, the impeller inner front end detection mold 6, and the impeller outer front end detection mold 5 are not limited to the number in the drawings of this embodiment, and the number and position of the through holes can be adjusted according to the actual use to ensure that the approximate contour shape of the suction cover 7, the impeller inner front end, and the impeller outer front end can be detected through each through hole. The plurality of through holes on the suction cover detection mold 4, the impeller inner front end detection mold 6, and the impeller outer front end detection mold 5 can be integrally formed by sand injection molding in the early stage, or can be manufactured by machining in the later stage. The outer contour shape of the above-mentioned suction cover detection mold 4 is basically consistent with the inner contour shape of the suction cover 7, and the error between the suction cover detection mold 4 and the repaired suction cover 7 is no more than 1mm. The inner contour shape of the impeller outer front end detection mold 5 is basically consistent with the outer contour shape of the impeller outer front end 8, and the error between the impeller outer front end detection mold 5 and the repaired impeller outer front end 8 is no more than 1mm. The outer contour shape of the impeller inner front end detection mold 6 is basically consistent with the outer contour shape of the impeller inner front end 9, and the error between the impeller inner front end detection mold 6 and the repaired impeller inner front end 9 is no more than 1mm.

[0049] The following describes a method for using one embodiment of each of the above-mentioned detection molds based on the structures of the above-mentioned suction cover detection mold 4, the impeller inner front end detection mold 6 and the impeller outer front end detection mold 5.

[0050] The suction cover detection mold 4 is placed into the repaired suction cover 7 with the central axis of the suction cover 7 as the reference. If it is found that the suction cover detection mold 4 cannot be placed into the suction cover 7, it can be determined that the repair of some areas of the suction cover 7 is too thick. The friction marks and jam marks between the suction cover detection mold 4 and the suction cover 7 are observed macroscopically to determine the area where the repair is too thick, and a color marker or red powder is used to mark it. The marked area where the repair is too thick is then lightly polished so that the suction cover detection mold 4 can just pass through the repair area. Since the internal structure of the suction cover 7 is annularly symmetrical, the direction in which the suction cover detection mold 4 is placed into the suction cover 7 can be continuously adjusted, and the area where the repair is too thick found during the continuous lowering of the suction cover detection mold 4 is recorded and repaired, so that the suction cover detection mold 4 can be completely placed in the suction cover 7 from any direction without causing a large offset. The depth gauge is sequentially inserted from the through hole of the suction cover detection mold 4 to the surface of the repaired suction cover 7 to detect the distance between the surface of the repaired suction cover 7 and the inner surface of the suction cover detection mold 4. In this embodiment, the thickness of the suction cover detection mold 4 is 3mm, the gap error between the suction cover detection mold 4 and the factory suction cover 7 is within 0.5mm, and the gap error between the suction cover detection mold 4 and the repaired suction cover 7 is within 1mm. The distance between the surface of the repaired suction cover 7 and the inner surface of the suction cover detection mold 4 can be within 4-5mm, and the errors between the detected distances are within 1mm. If it is detected that the above distance exceeds the error range, it means that the repair at this place is not enough and the repair at this place needs to be thickened. At this time, use a color marker pen to mark. After all the through holes are detected, the marked place is thickened and repaired by small-particle silicon carbide and silicon carbide repair agent. It is also possible to re-check whether there are crack defects on the repair surface of the repair area of ​​the suction cover 7 through macroscopic inspection or non-destructive testing. If there are, repair again. If not, put the suction cover detection mold 4 into the suction cover 7 after the second repair again, and use a depth gauge for secondary detection. After the detection, it is found that each distance is within the error range, which indicates that the suction cover 7 repair has reached the qualified standard. The use method of the impeller outer front end detection mold 5 and the impeller inner front end detection mold 6 is consistent with the use method of the above-mentioned suction cover detection mold 4, which will not be repeated here. Preferably, after the impeller repair is initially qualified by each impeller detection mold, the impeller needs to be dynamically balanced to ensure the smooth operation of the impeller. After the impeller dynamic balance test is qualified, the impeller surface can be coated with silicon carbide brush paint. After complete curing, the above repaired impeller can be put into use again.

[0051] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0052] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations. In addition, the various different embodiments of the present invention can also be combined arbitrarily, as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A method for detecting the repair status of a circulating pump suction cover and an impeller, characterized in that: The steps include: Get the original 3D model of the suction cover and impeller of the factory circulation pump; Based on the original three-dimensional model, construct a detection mold model of the easily worn surface of the suction cover and the impeller; Making a detection mold for the easily worn surface of the suction cover and the impeller based on sand mold 3D printing technology; Using the inspection mold to observe, inspect and adjust the repair conditions of the repaired suction cover and the impeller; Perform a dynamic balance test on the repaired impeller.

2. The method for detecting the repair status of the circulation pump suction cover and impeller according to claim 1 is characterized in that: Get the original 3D model of the suction cover and impeller of the factory circulating pump including: 3D scanning the suction cover and the impeller, and acquiring point cloud data of the suction cover and the impeller; constructing original three-dimensional models of the suction cover and the impeller based on the point cloud data; The deviation between the data of the original three-dimensional model and the point cloud data is analyzed and adjusted.

3. The method for detecting the repair status of the circulation pump suction cover and impeller according to claim 1, characterized in that: Based on the original three-dimensional model, constructing a detection mold model of the easily worn surface of the suction cover and the impeller includes: Based on the original three-dimensional models of the suction cover and the impeller, an inner contour line of the suction cover, an inner front end contour line of the impeller, and an outer front end contour line of the impeller are obtained; Based on the inner contour line of the suction cover, the inner front end contour line of the impeller and the outer front end contour line of the impeller, a suction cover inner contour model, an impeller inner front end contour model and an impeller outer front end contour model with a thickness of 3-5 mm are constructed; The overall structure of the sand core and the sand mold is determined, including constructing and optimizing the sand mold for the inner contour of the suction cover (1), the sand mold for the inner front end contour of the impeller (3), and the sand mold for the outer front end contour of the impeller (2).

4. The method for detecting the repair status of the circulation pump suction cover and impeller according to claim 3 is characterized in that: The suction cover internal contour sand mold (1) comprises a suction cover sand core (102), a suction cover upper sand mold (103) and a suction cover lower sand mold (101), and the suction cover upper sand mold (103) is provided with a suction cover gate (104) penetrating the suction cover upper sand mold (103).

5. The method for detecting the repair status of the circulation pump suction cover and impeller according to claim 3, characterized in that: The impeller outer front end contour sand mold (2) comprises an impeller outer front end sand core (202), an impeller outer front end upper sand mold (203) and an impeller outer front end lower sand mold (204), and the impeller outer front end upper sand mold (203) is provided with an impeller outer front end gate (201) penetrating the impeller outer front end upper sand mold (203).

6. The method for detecting the repair status of the circulation pump suction cover and impeller according to claim 3 is characterized in that: The impeller inner front end contour sand mold (3) comprises an impeller inner front end sand core (302), an impeller inner front end upper sand mold (301) and an impeller inner front end lower sand mold (304), and the impeller inner front end upper sand mold (301) is provided with an impeller inner front end gate (303) penetrating the impeller inner front end upper sand mold (301).

7. The method for detecting the repair status of the circulation pump suction cover and impeller according to claim 1, characterized in that: Using the inspection mold to observe and inspect the repaired suction cover and the impeller and adjusting the repaired conditions includes: Placing the inspection mold in the repair area of ​​the suction cover and the impeller to determine the initial repair conditions of the suction cover and the impeller; Use macroscopic inspection and detection tool marking to confirm the specific repair conditions of the suction cover and each repair area of ​​the impeller; Based on the specific repair situation, secondary adjustment and repair of the suction cover and the impeller; Macroscopic inspection and non-destructive testing are used to confirm that there are no crack defects in the repaired area.

8. The method for detecting the repair status of the circulation pump suction cover and impeller according to claim 7, characterized in that: Determining the initial repair conditions of the suction cover and the impeller includes: The detection mold interferes with the suction cover and the impeller, and it is determined that the suction cover and the impeller are repaired too thick; or There is a large amount of movement between the detection mold and the suction cover and the impeller, and it is determined that the suction cover and the impeller are repaired too thin.

9. The method for detecting the repair status of the circulation pump suction cover and impeller according to claim 8, characterized in that: The specific repair conditions of the suction cover and the impeller repair areas are confirmed by macroscopic inspection and detection tool marking, including: Using a depth gauge to measure the distance between the outer surface of the repaired area of ​​the suction cover and the impeller and the outer surface of the inspection mold; The error between each of the distances and the preset distance is determined, and areas with larger errors are marked.

10. A mold for detecting the repair status of the suction cover and impeller of a circulating pump, characterized in that: The invention comprises a suction cover detection mold (4) for detecting the repair status of the matching area between the suction cover (7) and the impeller, an impeller inner front end detection mold (6) for detecting the repair status of the impeller inner front end (9), and an impeller outer front end detection mold (5) for detecting the repair status of the impeller outer front end (8), wherein the suction cover detection mold (4), the impeller inner front end detection mold (6), and the impeller outer front end detection mold (5) are all provided with a plurality of through holes suitable for detection tools to be inserted.

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