Shielding pump impeller, wear plate repair welding process and device

Abstract

The application provides a shielding pump impeller, wear-resistant disc repair welding process and device, and relates to the technical field of welding, comprising the following steps: cleaning the to-be-welded positions of the to-be-repaired accessories, determining the repair welding thickness and processing allowance, selecting welding materials, and then adopting a rotating tool to perform symmetrical intermittent welding on different to-be-welded positions of the to-be-repaired accessories, so that the complete process flow improves the repair welding efficiency and the repair welding quality of the shielding pump impeller and wear-resistant disc, and the safety of the repair welding positions is enhanced. The application solves the technical problem that the existing technology for repairing the shielding pump impeller and wear-resistant disc is to purchase new accessory impellers and wear-resistant discs, which is high in cost, long in procurement cycle and long in transportation time, so that the equipment cannot be quickly restored to production in a short time, and the direct economic loss caused by replacing the new accessories is heavy.

Description

Technical Field

[0001] This invention relates to the field of welding technology, and in particular to a welding process and apparatus for repairing the impeller and wear-resistant disc of a shielded pump. Background Technology

[0002] Canned motor pumps are important mechanical devices mainly used in industrial fields such as nuclear power plants and petrochemicals. They are used to transport corrosive, toxic, flammable, explosive, expensive, low-temperature or high-temperature liquid media. The axial force of the canned motor pump is balanced by drilling balance holes in the impeller and installing sealing rings in the impeller, wear-resistant disc, and pump body.

[0003] In production, the impeller and wear-resistant disc of the canned motor pump will often wear due to the scouring of the medium or the corrosion of the fluid. After damage, the axial force of the canned motor pump will be unbalanced, which will cause damage to the thrust disc and bearings and other major parts, resulting in failure and shutdown, affecting production.

[0004] In the current technology, the maintenance of impellers and wear-resistant discs of canned pumps involves purchasing new parts, which is expensive, has a long procurement cycle, and a long transportation time. This results in the equipment being unable to quickly resume production after a short period of downtime, and the direct economic losses caused by replacing new parts are relatively heavy. Summary of the Invention

[0005] This invention provides a welding process and apparatus for repairing impellers and wear-resistant discs of canned motor pumps, in order to solve the technical problems mentioned in the background: In the prior art, the maintenance of impellers and wear-resistant discs of canned motor pumps involves purchasing new parts, which is expensive, has a long procurement cycle, and a long transportation time, resulting in the inability to quickly resume production after equipment downtime and the significant direct economic losses caused by replacing new parts.

[0006] To solve the above-mentioned technical problems, the present invention provides a welding process for repairing the impeller and wear-resistant disc of a shielded pump, comprising:

[0007] S1. Clean the soldering areas of the parts to be repaired;

[0008] S2. Determine the thickness of the weld repair and the machining allowance;

[0009] S3. Select welding materials;

[0010] S4. Use a rotating tooling to perform symmetrical intermittent welding at different welding positions of the parts to be repaired.

[0011] Preferably, step S1 includes: removing the part to be repaired, determining the location to be repaired, and using a lathe to completely remove the corrosion layer or damaged area until the metal luster is exposed.

[0012] Preferably, in step S2, a machining allowance of 1mm-2mm is reserved overall; in step S3, the welding material selected is nickel-based alloy welding material.

[0013] Preferably, the shielding gas used during welding is argon with a purity of ≥99.99%, the gas flow rate is maintained at 10-15L / min, and the wind speed is not greater than 2m / s. During the welding operation, the welding material is located in front of the tungsten electrode and is fed in while melting, so that the end of the welding material is always within the argon protection range.

[0014] The welding torch should be at a 60° angle to the workpiece, and the welding wire should be at a 30° angle to the workpiece. The interpass temperature should be controlled below 100°C. Multiple layers and multiple passes should be welded. After each layer is completed, the oxide slag on the surface should be removed. The joints should be staggered during each layer and each pass. After each layer is completed, a penetrant test should be performed and surface defects should be eliminated.

[0015] The present invention also provides a welding device for repairing the impeller and wear-resistant disc of a shielded pump, including a rotating fixture, the rotating fixture comprising:

[0016] The pump impeller and wear-resistant disc repair welding device includes a rotating fixture, which includes:

[0017] A base and a driving component are disposed inside the top of the base. A rotating disk is rotatably disposed on the top of the base. The driving component is connected to the rotating disk in a transmission manner. Two symmetrical support plates are disposed on the top of the rotating disk. A fastener assembly is disposed between the two support plates through a rotating cylinder. The rotating cylinder is rotatably connected to the two support plates. A driving module is disposed on one side of the support plate. The driving module is connected to the rotating cylinder in a transmission manner.

[0018] Preferably, the firmware component includes a firmware box.

[0019] A motor is located at the bottom of the firmware box. A drive shaft is vertically rotatably positioned in the center of the firmware box. The output end of the motor is connected to the drive shaft. A bevel gear is mounted on the drive shaft. A threaded sleeve is mounted on the top of the drive shaft. The top of the drive shaft is threadedly connected to the inner wall of the threaded sleeve. A toothed plate is mounted on the top of the threaded sleeve. A limiting post is mounted on the outer side of the toothed plate. The lower end of the limiting post is fixedly connected to the upper end of the firmware box. A rotating rod is rotatably mounted on the inner wall of the limiting post. Two rotating rods are symmetrically arranged on both sides of the toothed plate. The rotating side of the rotating rod meshes with the teeth on the toothed plate. An abutment ball is mounted on the other end of the rotating rod. Clamping modules are symmetrically arranged on both sides of the drive shaft and are connected to the drive shaft.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. On-site repair of canned motor pump impellers and wear-resistant discs;

[0022] 2. Increase service life and reduce maintenance costs;

[0023] 3. It enables efficient repair of canned motor pump impellers and wear-resistant discs. Through practical experience, relevant welding processes and standard repair procedures have been developed, which have significant economic implications for the reuse of canned motor pump impellers and wear-resistant discs. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the process flow of the present invention;

[0026] Figure 2 This is the overall structural concept of the rotating tooling of the present invention;

[0027] Figure 3 This is a partial cross-sectional structural diagram of the rotating tooling of the present invention;

[0028] Figure 4 yes Figure 3 A partially enlarged structural diagram.

[0029] Figure label:

[0030] 1. Base; 2. Drive unit; 3. Rotary disk; 4. Support plate; 5. Drive module; 51. Protective cover; 52. Motor II; 53. Spur gear I; 54. Spur gear II; 6. Firmware assembly; 61. Firmware box; 62. Drive shaft; 621. Bevel gear I; 622. Motor I; 63. Screw sleeve; 64. Gear plate; 65. Limiting post; 66. Rotating rod; 67. Abutment ball; 68. Clamping module; 681. Screw; 682. Bevel gear II; 683. Limiting plate; 684. Moving block; 685. Limiting arm; 686. Buffer pad; 687. Buffer spring; 688. Track column; 7. Rotating cylinder; 8. Impeller. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0032] Furthermore, in this invention, the use of terms such as "first" and "second" is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit the invention. They are merely used to distinguish components or operations described using the same technical terms and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions and features of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If a combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0033] The present invention provides the following embodiments.

[0034] Example 1

[0035] This invention provides a welding process for repairing the impeller and wear-resistant disc of a shielded pump, such as... Figure 1 As shown, it includes:

[0036] S1. Clean the soldering areas of the parts to be repaired;

[0037] S2. Determine the thickness of the weld repair and the machining allowance;

[0038] S3. Select welding materials;

[0039] S4. Use a rotating tooling to perform symmetrical intermittent welding at different welding positions of the parts to be repaired.

[0040] The working principle and beneficial effects of the above technical solution are as follows: The present invention first removes the impeller and wear-resistant disc, and uses a lathe to completely remove the corrosion layer or damaged position on the impeller and wear-resistant disc until the metal luster is exposed. In particular, the position that needs to be repaired needs to be checked to see if it is clean.

[0041] The thickness of the weld and the machining allowance at the repair location are determined by instrument measurement. The machining allowance is 1mm-2mm in total to prevent the chipping of the tool during machining. To prevent the parts from deforming during the welding process, a special water tank for welding is used for water cooling.

[0042] The selection of welding materials is important. Since the original material of the parts is S22053, its corrosion resistance and high-temperature creep resistance are worse than those of nickel-based alloys. The main reasons for the damage to the parts are corrosion by strong corrosive media and failure of metal parts due to high service environment temperature. Therefore, nickel-based alloy welding materials are selected for repair welding. Nickel-based alloys have good resistance to active gases, wear resistance and strong media corrosion resistance, as well as high strength, good plasticity and good weldability. They are a very important corrosion-resistant metal material in the industrial field.

[0043] Reasonable and standardized welding sequence: In order to reduce the deformation of parts, a rotating tool is used to perform symmetrical and intermittent welding of parts. This method can reduce the concentration of welding heat, thermal deformation and residual stress.

[0044] Reasonable and standardized welding process: The shielding gas during welding is argon with a purity of ≥99.99%, the gas flow rate is maintained at 10-15L / min, the wind speed is not greater than 2m / s, the welding current is 80-130A, the welding voltage is 12-16V, and the welding speed is 5-7cm / min. The weld pool of nickel-based alloys is very viscous and the penetration depth is shallow. Increasing the welding current will not significantly improve the fluidity of the metal or increase the penetration depth. During welding operation, the welding wire should not directly enter the weld pool. The welding material should be placed in front of the tungsten electrode and fed in while melting, so that the end of the welding material is always within the argon protection range.

[0045] During welding, process parameters and welding angles should be controlled. The angle between the welding torch and the workpiece should be 60°, and the angle between the welding wire and the workpiece should be 30°. The interpass temperature should be controlled within 100°. Multiple layers and multiple passes should be welded. After each layer is completed, the oxide slag on the surface should be removed. The joints should be staggered during each layer and each pass. After each layer is welded, a penetrant test should be performed and various surface defects should be eliminated.

[0046] Welding defects mainly include undercut and incomplete fusion. In order to eliminate these defects, when swinging to the limit position on each side during welding, pause slightly to allow enough time for the molten weld metal to fully fuse with the base metal and fill the undercut area. Try to keep the unevenness of the repair surface consistent to facilitate subsequent machining operations.

[0047] The aforementioned complete process improves the efficiency of repair welding and the quality of repair welding of the impeller and wear-resistant disc of the canned pump, while also enhancing the safety of the repair welding location.

[0048] This invention solves the technical problem mentioned in the background: In the prior art, the maintenance of impellers and wear-resistant discs of canned pumps always involves purchasing new parts, which is expensive, has a long procurement cycle, and a long transportation time. This results in the inability to quickly resume production after equipment downtime, and the direct economic losses caused by replacing new parts are too significant.

[0049] Example 2

[0050] Based on Example 1, such as Figure 2 , Figure 3 As shown, a canned pump impeller 8 and wear-resistant disc repair welding device includes a rotating fixture, which includes:

[0051] The welding device for repairing the impeller and wear-resistant disc of the canned motor pump includes a rotating fixture, which includes:

[0052] A base 1 and a driving component 2 are disposed inside the top of the base 1. A rotating disk 3 is rotatably disposed on the top of the base 1. The driving component 2 is connected to the rotating disk 3 in a transmission manner. Two symmetrical support plates 4 are disposed on the top of the rotating disk 3. A fastener assembly 6 is disposed between the two support plates 4 through a rotating cylinder 7. The rotating cylinder 7 is rotatably connected to the two support plates 4. A driving module 5 is disposed on one side of the support plate 4. The driving module 5 is connected to the rotating cylinder 7 in a transmission manner.

[0053] The working principle and beneficial effects of the above technical solution are as follows: The driving component 2 in this invention is an electric motor, the base 1 protects the electric motor, the electric motor drives the rotating disk 3 to rotate, thereby adjusting the horizontal rotation angle of the support plate 4 and the fastener assembly 6, the driving module 5 drives the rotating cylinder 7 to rotate, thereby adjusting the longitudinal rotation angle of the fastener assembly 6 along the direction of the rotating cylinder 7, and the fastener assembly 6 fixes the canned pump impeller 8 and the wear-resistant disc, realizing the efficient repair work of the canned pump impeller 8 and the wear-resistant disc, solving the problem that the cost of replacing new parts after the canned pump impeller 8 and the wear-resistant disc are high, and the return to the factory for installation and maintenance cycle is long, which has extremely high economic significance for the reuse of the canned pump impeller 8 and the wear-resistant disc.

[0054] Example 3

[0055] Based on Example 2, such as Figure 3 , Figure 4 As shown, the firmware component 6 includes a firmware box 61.

[0056] A motor 622 is installed at the bottom of the firmware box 61. A drive shaft 62 is vertically rotatably mounted in the center of the firmware box 61. The output end of the motor 622 is connected to the drive shaft 62. A bevel gear 621 is mounted on the drive shaft 62. A threaded sleeve 63 is mounted on the top of the drive shaft 62. The top of the drive shaft 62 is threadedly connected to the inner wall of the threaded sleeve 63. A toothed plate 64 is mounted on the top of the threaded sleeve 63. A limiting post 65 is mounted on the outer side of the toothed plate 64. The lower end of the limiting post 65 is fixedly connected to the upper end of the firmware box 61. A rotating rod 66 is rotatably mounted on the inner wall of the limiting post 65. Two rotating rods 66 are symmetrically arranged on both sides of the toothed plate 64. The rotating side of the rotating rod 66 meshes with the teeth on the toothed plate 64. The other end of the rotating rod 66 is provided with an abutment ball 67. Clamping modules are symmetrically arranged on both sides of the drive shaft 62. The clamping modules are connected to the drive shaft.

[0057] The working principle and beneficial effects of the above technical solution are as follows: Drive shaft 62 rotates under the drive of motor 622, bevel gear 621 rotates synchronously with drive shaft 62, and the top of drive shaft 62 rotates while the threaded sleeve 63 rises and falls. When the threaded sleeve 63 rises and falls, it drives the toothed plate 64 to rise and fall synchronously. The limiting post 65 protects the toothed plate 64 and facilitates the insertion of the impeller 8 and the wear-resistant disc's center hole, thereby limiting the impeller 8 and the wear-resistant disc. When the toothed plate 64 rises, it drives the impeller 8 and the wear-resistant disc through meshing. The rotating rods 66 at both ends rotate. When the rotating rods 66 rotate upward, they retract into the limiting post 65, which facilitates the insertion of the impeller 8 and the wear-resistant disc. When the rotating rods 66 rotate downward, the abutting ball 67 abuts against the upper surface of the impeller 8 and the wear-resistant disc, limiting the impeller 8 and the wear-resistant disc. At the same time, the left clamping module 68 and the right clamping module 69 move towards the middle to limit the left and right ends of the impeller 8 and the wear-resistant disc, ensuring that the impeller 8 and the wear-resistant disc will not be mis-welded due to the adjustment of the angle during the repair welding.

[0058] Example 4

[0059] Based on Example 3, such as Figure 4 As shown, the left clamping module 68 on the left side includes a screw 681.

[0060] The screw 681 is horizontally rotatably disposed between the inner wall of the fastener box 61 and the limiting plate 683. The limiting plate 683 is fixedly connected to the lower end of the fastener box 61. One end of the screw 681 is provided with a second bevel gear 682, which meshes with the first bevel gear 621. The moving block 684 is threaded onto the screw 681. The moving block 684 is provided with a limiting arm 685. A buffer pad 686 is provided on the inner side of the limiting arm 685. The track post 688 is horizontally disposed on the inner wall of the fastener box 61. The track post 688 passes through the limiting arm 685. A buffer spring 687 is provided on the track post 688 between the limiting arm 685 and the inner wall of the fastener box 61.

[0061] The working principle and beneficial effects of the above technical solution are as follows: When the drive rod rotates, the bevel gear 621 rotates synchronously. The bevel gear 621 drives the screw 681 to rotate through meshing with the bevel gear 682. When the screw 681 rotates, the moving block 684 moves on the screw 681 through the thread, causing the two limiting arms 685 to move closer or further apart. The limiting arms 685 move with the moving block 684. The track column 688 limits the movement of the limiting arms 685 to prevent the limiting arms 685 from deviating during movement. The buffer spring 687 buffers the limiting arms 685, reducing the vibration generated by the limiting arms 685 during movement. The buffer pad 686 buffers the top of the impeller 8, the wear-resistant disc, and the limiting arms 685, protecting the impeller 8, the wear-resistant disc, and the limiting arms 685. After a period of use, only the buffer pad 686 needs to be replaced, saving costs and simplifying maintenance.

[0062] Example 5

[0063] Based on Example 4, such as Figure 4 As shown, the drive module 5 includes a protective cover 51.

[0064] The protective cover 51 is disposed on the outside of the support plate 4. One end of the rotating cylinder 7 extends into the protective cover 51 and is provided with a straight tooth 53. A motor 52 is horizontally fixed on the inner wall of the protective cover 51. A straight tooth 54 is provided at the output end of the motor 52. The straight tooth 53 meshes with the straight tooth 54 for transmission.

[0065] The working principle and beneficial effects of the above technical solution are as follows: the protective cover 51 protects the parts inside the drive module 5, the motor 2 52 drives the straight gear 1 53 at the output end to rotate, and the straight gear 1 53 drives the rotating cylinder 7 to rotate through meshing with the straight gear 2 54 when rotating. When the rotating cylinder 7 rotates, it drives the firmware assembly 6 to rotate, thereby adjusting the angle of the firmware assembly 6 and its impeller 8 and wear-resistant disc, which facilitates finding a suitable welding angle during repair welding.

[0066] Example 6, based on any one of Examples 2-5, further includes an evaluation device, which comprises:

[0067] The dimension detection module is used to detect the damage dimension information of each damaged part of each accessory to be repaired: damage length A, damage width B, and damage depth H.

[0068] The ultrasonic testing module includes an ultrasonic transmitter and an ultrasonic receiver. The ultrasonic transmitter emits ultrasonic waves in different directions to each damaged part of each accessory to be repaired, and receives the ultrasonic waves through the ultrasonic receiver. When the accessory to be repaired is an impeller, each blade of the impeller is a part; each damaged part receives ultrasonic waves in at least one direction for each damage.

[0069] The memory stores historical repair information for each component to be repaired;

[0070] The model building module is used to construct a model of the part to be repaired;

[0071] The marking module is used to mark the damage size information of the damaged parts on the model of the part to be repaired;

[0072] The first calculation module is used to calculate the damage level and damage assessment value of each damage to each damaged component based on the size detection module and the ultrasonic detection module.

[0073] The first early warning module is used when h ki h k0 Issue an early warning and identify the damaged component as one that cannot be repaired by welding; h ki h is the damage assessment value of the i-th damage to the k-th damaged component of the current repair accessory; k0 This represents the maximum permissible damage assessment value for the kth damaged component of the current repair accessory.

[0074] The determination module is used to identify the target part to be repaired; when all the damaged parts of a certain part to be repaired are not unrepairable by welding, the corresponding part to be repaired is determined to be the target part to be repaired, which can be repaired by welding.

[0075] Preferably, the first calculation module calculates the damage level and damage assessment value for each damage to each damaged component based on the following formula;

[0076]

[0077] H ki Let A be the damage level of the i-th damage to the k-th damaged component of the current repair accessory. ki B ki B ki These are the damage length, damage width, and damage depth of the i-th damage to the k-th damaged component of the current part to be repaired. The rounding sign is used for rounding up, and V0 is the baseline damage volume (corresponding to the unit damage level).

[0078]

[0079] h ki W represents the damage assessment value of the i-th damage to the k-th damaged component of the current repair accessory; ki ε represents the total number of other damages affecting the location of the i-th damage in the current part to be repaired; ic The strength correlation of the c-th other damages that affect the location of the i-th damage in the current repaired parts to the location of the i-th damage (obtained according to preset rules based on parameters such as the distance between damages in the standardized model, with a value greater than 0 and less than 1); M i θ represents the total detection direction of the ultrasonic testing module in the kth damaged component of the current repair accessory; id θ represents the actual ultrasonic wave velocity detected in the d-th detection direction of the ultrasonic detection module in the k-th damaged component of the current repair accessory; id0 For θ id Initial standard ultrasonic wave velocity at the location; θ id The evaluation coefficient (with a value greater than 0 and less than 1) is the d-th detection direction of the ultrasonic detection module in the k-th damaged component of the current repair accessory.

[0080] The beneficial effects of the above technical solution are as follows: the size detection module obtains the specific size information of each damage and marks the damage size information of the damaged parts on the model of the part to be repaired (impeller or wear-resistant disc), which makes it easier to obtain the damage distribution state of the part to be repaired, and facilitates damage assessment and repair strategy formulation based on this.

[0081] The damage level H of each damage to each damaged component is calculated based on the size information. ki Then consider the correlation between damage states. And the current strength change status of the component to be repaired (e.g., strength reduction due to aging after long-term use). The damage assessment value is determined comprehensively and the calculation is reliable;

[0082] Used when h ki h k0 It can issue an early warning, identify the corresponding damaged parts as unrepairable by welding, and determine different handling strategies for the parts based on the early warning status when the entire part to be repaired cannot be repaired and used.

[0083] The determination module is used to identify the target part to be repaired. When all the damaged parts of a certain part to be repaired are not unrepairable parts, the corresponding part to be repaired is identified as the target part to be repaired. It can be repaired by welding, thereby eliminating parts that cannot be repaired by welding and avoiding wasting welding time.

[0084] Example 7, based on Example 6, includes a second calculation module used to calculate the target repair strength for each damaged part of each target component to be repaired;

[0085]

[0086] G ki S represents the target repair strength for the i-th damage to the k-th damaged component of the current repair accessory; ki Let G be the area to be welded for the i-th damage of the k-th damaged component of the current repair accessory; ln is the natural logarithm, e is the natural constant; G ki0 for The corresponding theoretical repair strength; σ1 and σ2 are the first coefficient (values ​​greater than -1 and less than 1) and the second coefficient (values ​​greater than 0 and less than 1), respectively; V ik V is the average detected value of the ultrasonic wave velocity passing through the i-th damage of the k-th damaged component of the current repair accessory, in the direction of ultrasonic wave emission. ik0 The initial standard ultrasonic wave velocity is the kth damaged component of the current accessory to be repaired.

[0087] The beneficial effects of the above technical solution are: calculating the target repair strength of each damaged part of each target component to be repaired, determining welding parameters based on the target repair strength, and ensuring the repair effect.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A shielded pump impeller, wear plate repair welding device, characterized in that, The welding device for repairing the impeller and wear-resistant disc of the canned motor pump includes a rotating fixture, which includes: A base (1) and a drive unit (2) are disposed inside the top of the base (1). A rotating disk (3) is rotatably disposed on the top of the base (1). The drive unit (2) is connected to the rotating disk (3) in a transmission manner. Two symmetrical support plates (4) are disposed on the top of the rotating disk (3). A fastener assembly (6) is disposed between the two support plates (4) through a rotating cylinder (7). The rotating cylinder (7) is rotatably connected to the two support plates (4). A drive module (5) is disposed on one side of the support plate (4). The drive module (5) is connected to the rotating cylinder (7) in a transmission manner. The firmware component (6) includes a firmware box (61). A motor (622) is provided at the bottom of the firmware box (61). A drive shaft (62) is vertically rotatably disposed in the center of the firmware box (61). The output end of the motor (622) is connected to the drive shaft (62) for transmission. A bevel gear (621) is provided on the drive shaft (62). A threaded sleeve (63) is provided on the top of the drive shaft (62). The top of the drive shaft (62) is threadedly connected to the inner wall of the threaded sleeve (63). A toothed plate (64) is provided on the top of the threaded sleeve (63). The toothed plate (64) is covered with a limiting post (65) on its outer side. The lower end of the limiting post (65) is fixedly connected to the upper end of the fastener box (61). A rotating rod (66) is rotatably arranged on the inner wall of the limiting post (65). Two rotating rods (66) are symmetrically arranged on both sides of the toothed plate (64). The rotating side of the rotating rod (66) meshes with the teeth on the toothed plate (64). The other end of the rotating rod (66) is provided with an abutment ball (67). Clamping modules are symmetrically arranged on both sides of the drive shaft (62). The clamping modules are connected to the drive shaft (62) in a transmission manner.

2. A shielding pump impeller, wear plate repair welding device according to claim 1, characterized in that, The drive module (5) includes a protective cover (51), which is located on the outside of the support plate (4). One end of the rotating cylinder (7) extends into the protective cover (51) and is provided with a straight tooth (53). A motor (52) is horizontally fixed on the inner wall of the protective cover (51). A straight tooth (54) is provided at the output end of the motor (52). The straight tooth (53) meshes with the straight tooth (54) for transmission.

3. A shielding pump impeller, wear plate repair welding device according to claim 1, characterized in that, It also includes an evaluation device, which includes: The dimension detection module is used to detect the damage dimension information of each damaged part of each accessory to be repaired: damage length A, damage width B, and damage depth H. The ultrasonic testing module includes an ultrasonic transmitter and an ultrasonic receiver. The ultrasonic transmitter emits ultrasonic waves in different directions to each damaged part of each accessory to be repaired, and receives the ultrasonic waves through the ultrasonic receiver. When the accessory to be repaired is an impeller, each blade of the impeller is a part; each damaged part receives ultrasonic waves in at least one direction for each damage. The memory stores historical repair information for each component to be repaired; The model building module is used to construct a model of the part to be repaired; The marking module is used to mark the damage size information of the damaged parts on the model of the part to be repaired; The first calculation module is used to calculate the damage level and damage assessment value of each damage to each damaged component based on the size detection module and the ultrasonic detection module. The first early warning module is used when... The system issues an early warning and identifies the damaged components as those that cannot be repaired by welding. This is the damage assessment value for the i-th damage to the k-th damaged component of the current repair accessory; This represents the maximum permissible damage assessment value for the kth damaged component of the current repair accessory. The determination module is used to identify the target part to be repaired; when all the damaged parts of a certain part to be repaired are not unrepairable by welding, the corresponding part to be repaired is determined to be the target part to be repaired, which can be repaired by welding.

4. The welding device for repairing the impeller and wear-resistant disc of a shielded pump according to claim 3, characterized in that, The first calculation module calculates the damage level and damage assessment value for each damage to each damaged component based on the following formula; ； Let i be the damage level of the i-th damage to the k-th damaged component of the current repair accessory. , , These are the damage length, damage width, and damage depth of the i-th damage to the k-th damaged component of the current part to be repaired. The rounding up symbol, The reference damage volume; ； This is the damage assessment value for the i-th damage to the k-th damaged component of the current repair accessory; This represents the total number of other damages affecting the location of the i-th damage in the current part to be repaired. The strength correlation of the cth other damage that affects the location of the i-th damage in the current parts to be repaired; The total detection direction of the ultrasonic testing module in the kth damaged component of the current part to be repaired; The actual ultrasonic wave velocity detected in the d-th detection direction of the ultrasonic detection module in the k-th damaged component of the current repair accessory; for Initial standard ultrasonic wave velocity at the location; This is the evaluation coefficient for the d-th detection direction of the ultrasonic testing module in the k-th damaged component of the current repair accessory.

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