Auxiliary jig facilitating quick assembly of impeller

Abstract

The invention relates to the field of impeller assembly, and discloses an auxiliary jig convenient for quickly assembling an impeller, a fixed table and a vertical plate are arranged at the top of a movable lifting mechanism, an extension cylinder, a circular ring and uniformly distributed chutes are connected, and accurate centering and clamping of the impeller are realized by matching with a clamping screw rod, a connecting plate, a telescopic rod and a roller of a centering and clamping mechanism; the overall position and height can be flexibly adjusted through the universal wheels, the control screws and the connecting shafts; the impeller and the volute rotating shaft can be uniformly mounted in an interference manner through a firing pin, a swing plate, a U-shaped groove, a clamping groove and an impact adjusting mechanism; and the centering laser pen assists in further improving the mounting precision and efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of impeller assembly, and in particular to an auxiliary jig for facilitating quick assembly of an impeller. Background Art

[0002] During the manufacturing and assembly of large centrifugal pumps, turbines or similar equipment, the installation and alignment of the impeller and the volute is one of the key links. The impeller is usually large in size and mass, and during its installation on the volute, it is necessary to maintain precise coaxiality and proper axial position to ensure subsequent smooth operation and overall performance stability. However, in the prior art, the installation and positioning of large impellers often rely on manual operation or simple tooling to assist.

[0003] In the traditional impeller assembly process, operators usually need to use lifting equipment to first lift the impeller near the volute, and then achieve the initial positioning of the impeller relative to the volute through multiple fine-tuning. Due to the large size of the impeller and its heavy weight, the positioning process often has the following problems: on the one hand, the inside of the impeller needs to be accurately aligned with the rotating axis of the volute and cooperate with the reserved keyway or positioning structure, but due to the lack of effective centering clamping means, it often takes a lot of time to reach the initial position through repeated trial and error, slow rotation and adjustment. On the other hand, when the impeller is inserted into the volute cavity, if there is a lack of reasonable support and guide devices, it is easy for the outer peripheral part of the impeller to rub against the inner wall of the volute or other installation parts or even get stuck, which not only affects the installation speed and quality, but may also cause damage to the surface of the parts. At the same time, the height adjustment and centering judgment of the impeller are also difficult under traditional conditions. Once the positioning is inaccurate, the lifting angle and height need to be readjusted, which further increases the complexity and repeatability of the installation.

[0004] In addition, when the impeller and the rotating shaft of the volute need to achieve interference fit to ensure assembly accuracy and tightness, most existing technologies can only be achieved by external manual knocking or other unstable knocking devices. Such methods cannot ensure uniform and synchronous knocking force, which can easily cause uneven force on the impeller during the interference fit process, affecting the stability and quality of the installation. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides an auxiliary fixture for facilitating quick assembly of an impeller, thereby solving the problem.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: An auxiliary jig for facilitating quick assembly of an impeller, comprising a mobile lifting mechanism and a connecting ring, wherein the mobile lifting mechanism is used to control the position and height of the impeller, a fixed platform is installed on the top of the mobile lifting mechanism, and the fixed platform comprises a lifting plate, a vertical plate is fixed on the front side of the lifting plate, an extension cylinder is fixed on the upper surface of the front side of the vertical plate, a circular ring is arranged at the front end of the extension cylinder, and three sliding grooves are evenly opened on the surface of the circular ring; A centering clamping mechanism is installed on the surface of the circular ring, and the centering clamping mechanism is used to center and clamp the impeller; The centering clamping mechanism includes a clamping screw that is screwed through the center of the extension tube and a telescopic rod that slides inside the slide groove. An annular groove is provided on the front end of the surface of the clamping screw, a connecting plate is rotatably installed on the inner side of the annular groove, a knob is provided on the rear end of the clamping screw, the connecting plate is a triangular structure, and fixing bolts are provided in parallel on three side surfaces of the connecting plate. A first connecting rod is hinged on the surface of the fixing bolt, and one end of the first connecting rod that is away from the fixing bolt is hinged on the telescopic rod, and a roller is rotatably installed on the front side of one end of the telescopic rod that is away from each other.

[0007] Furthermore, the connecting ring is placed on the rear side of the vertical plate, the clamping screw passes through the connecting ring, a slot is provided on the surface of the connecting ring, three firing pins are evenly arranged on the front surface of the connecting ring, and the firing pins pass through the extension tube.

[0008] Furthermore, through holes are provided at three corners of the surface of the connection plate, the striker passes through the through holes, and the end of the striker is pressed and installed on the center of the impeller.

[0009] Furthermore, reinforcing rib plates are symmetrically arranged between the back of the vertical plate and the lifting plate, a fixed shaft is arranged between the two reinforcing rib plates, and a swing plate is rotatably mounted on the surface of the fixed shaft.

[0010] Furthermore, a U-shaped groove is provided on the top of the swing plate, the U-shaped groove is matched with the card slot, and a handle groove is provided below the surface of the swing plate.

[0011] Furthermore, an impact adjustment mechanism is installed on the back of the vertical plate, and the impact adjustment mechanism includes two bosses for fixing the vertical plate on the back, a double screw is rotatably installed between the two bosses, and moving blocks are symmetrically installed on the surface of the double screw, and the two moving blocks are respectively screwed on different thread surfaces.

[0012] Furthermore, a second connecting rod is hinged on the surface of the moving block, two ends of the second connecting rod are hinged on the transverse plate, a tension spring is connected to the surface of the transverse plate, and one end of the tension spring facing away from the transverse plate is connected to the swing plate.

[0013] Furthermore, the mobile lifting mechanism includes a base plate, universal wheels are installed at the four corners of the bottom of the base plate, a fixed seat is installed on the upper surface of the base plate, a first connecting plate is symmetrically hinged on the inner side of the fixed seat, and a connecting shaft is installed at the end of the first connecting plate.

[0014] Furthermore, a second connecting plate is hinged on the surface of the connecting shaft, and the ends of the two second connecting plates facing away from the connecting shaft are hinged on the bottom of the connecting platform. The lifting plate is fixed on the connecting platform, and a control screw is laterally screwed between the two connecting shafts, and the two connecting shafts are respectively screwed on different threaded surfaces.

[0015] Furthermore, a centering laser pen is embedded in the front end surface of the clamping screw, and the centering laser pen is used to assist centering.

[0016] The present invention provides an auxiliary jig for facilitating quick assembly of an impeller, and has the following beneficial effects: By setting an extension tube and a circular ring at the front end of the fixed platform and evenly opening sliding grooves on the surface of the circular ring, the centering clamping mechanism can effectively achieve preliminary centering and precise clamping before the impeller enters the volute. Through the transmission linkage structure between the clamping screw, the connecting plate, the first connecting rod and the telescopic rod, the three rollers can be evenly extended outward and close to the inner ring surface of the impeller at the same time, thereby reducing repeated trial and error and frequent shaking during the insertion of the impeller into the volute. Compared with the traditional tooling that relies on manual repeated adjustment and trial installation, through this technical solution, the impeller axis can be aligned with the center of the volute in the early stage of impeller installation, which greatly improves the centering efficiency and accuracy, and reduces the risk of wear and jamming at the mating parts of the impeller and the volute.

[0017] During the assembly process, the flexible movement and height adjustment of the entire device are achieved by setting a universal wheel at the bottom of the fixture and configuring a control screw between the two connecting shafts, so that the impeller can maintain precise control in both the horizontal and vertical directions. This flexible adjustment method can quickly match the installation port position of the volute after centering and clamping, so that the impeller does not need to be repeatedly hoisted and offset with external assistance, greatly reducing the intensity and complexity of the installation operation. At the same time, when the impeller enters the inner cavity of the volute, the roller clamps the impeller from the inside to the outside and there are no additional protrusions on the outer ring surface, which ensures that the impeller is inserted smoothly without repeated probing and slow fine-tuning at the assembly gap, improving the smoothness of installation and reducing surface wear of components.

[0018] By integrating the impact adjustment mechanism and the swing plate with the U-groove and the slot on the back of the fixture, a uniform and controllable impact effect can be provided when the impeller and the rotating shaft of the volute are interference fit. Three strikers penetrate the through hole of the connecting plate and correspond to the center position of the impeller, so as to apply multi-point uniform impact during interference installation, ensure the force balance of the impeller, and avoid tilting, eccentricity or impeller damage caused by uneven force under traditional manual knocking methods. Through the adjustment structure of the double screw, moving block, second connecting rod and tension spring, the preload force and impact strength of the striker can be changed to achieve precise tuning for different impeller sizes or materials. This adjustment method not only improves the assembly quality and efficiency of the interference fit, but also reduces repeated replacement or secondary processing during the installation process, reducing production costs and time consumption.

[0019] During the overall installation process, the auxiliary role of the centering laser pen makes the impeller alignment more intuitive. The laser point clearly indicates the deviation between the impeller center and the volute axis, and the operator does not need to rely on experience to estimate and make tentative adjustments. Compared with the lack of accurate centering reference and the need for repeated trial installation in the background technology, this technical solution significantly shortens the initial positioning time, reduces the difficulty of operation, and ensures that the final installation accuracy of the impeller is greatly improved. With the close cooperation of all components, the entire process of the device from movement, clamping, centering, height adjustment, impact to final interference installation can be precisely controlled, making the installation of large impellers simple, efficient, accurate and stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the installation three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the back three-dimensional structure of the present invention; Figure 3 It is a structural schematic diagram of the mobile lifting mechanism of the present invention; Figure 4 It is a stereoscopic schematic diagram of the installation of the fixing platform and the connecting ring of the present invention; Figure 5 It is a schematic diagram of the installation structure of the clamping screw and the telescopic rod of the present invention; Figure 6 It is a schematic diagram of the three-dimensional structure of the fixed platform and the swing plate of the present invention; Figure 7 It is a schematic diagram of the three-dimensional structure of the connecting plate of the present invention; Figure 8 It is a schematic diagram of the top view of the impact adjustment mechanism of the present invention; Fig. 9 It is a schematic diagram of the three-dimensional structure of the connecting ring and the firing pin of the present invention.

[0021] Among them, 1. Mobile lifting mechanism; 11. Bottom plate; 12. Universal wheel; 13. Fixed seat; 14. First connecting plate; 15. Connecting shaft; 16. Second connecting plate; 17. Control screw; 18. Connecting platform; 2. Fixed platform; 21. Lifting plate; 221. Extension tube; 22. Vertical plate; 23. Reinforcement rib plate; 24. Ring; 25. Slide; 26. Fixed shaft; 3. Centering clamping mechanism; 31. Clamping screw; 32. Rotary Button; 33, ring groove; 34, centering laser pen; 35, connecting plate; 351, fixing bolt; 352, through hole; 36, first connecting rod; 37, telescopic rod; 38, roller; 4, swing plate; 41, U-shaped groove; 42, handle groove; 5, connecting ring; 51, card slot; 52, striker; 6, impact adjustment mechanism; 61, boss; 62, double screw; 63, moving block; 64, second connecting rod; 65, cross plate; 66, tension spring. DETAILED DESCRIPTION

[0022] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Embodiment 1: See also Figure 1-9 An auxiliary fixture for facilitating quick assembly of an impeller comprises a mobile lifting mechanism 1 and a connecting ring 5. The mobile lifting mechanism 1 is used to control the position and height of the impeller. A fixed platform 2 is installed on the top of the mobile lifting mechanism 1. The fixed platform 2 comprises a lifting plate 21. A vertical plate 22 is fixed on the front side of the lifting plate 21. An extension cylinder 221 is fixed on the upper surface of the front side of the vertical plate 22. A circular ring 24 is arranged at the front end of the extension cylinder 221. Three slide grooves 25 are evenly arranged on the surface of the circular ring 24. The large impeller can be moved vertically by the mobile lifting mechanism 1. Precise adjustment can be performed to adapt to different volute installation requirements; the stable structure of the fixed platform 2 and the lifting plate 21 can realize reliable support for the impeller and reduce shaking during the centering process; the forward extension structure of the vertical plate 22 and the extension tube 221 can make the inner ring surface of the impeller align with the center position of the circular ring 24 to achieve better coaxiality control; the three evenly distributed sliding grooves 25 on the circular ring 24 can provide stable guidance for the telescopic rod 37 of the subsequent centering clamping mechanism 3, thereby ensuring that the impeller maintains precise positioning when inserted into the volute and reducing the process of repeated adjustments.

[0024] A centering clamping mechanism 3 is installed on the surface of the ring 24, and the centering clamping mechanism 3 is used to center and clamp the impeller; by directly arranging the centering clamping mechanism 3 on the surface of the ring 24, the clamping screw 31 and the telescopic rod 37 can be guided in the slide groove 25 so as to accurately rest against the inner ring surface of the impeller; through this tight fit, the impeller can be preliminarily centered before the impeller enters the volute, so that the impeller can reduce shaking and repeated trial and error during installation, thereby improving assembly accuracy and efficiency.

[0025] 3 comprises a clamping screw 31 screwed through the center of the extension tube 221 and a telescopic rod 37 sliding inside the slide groove 25, a front end of the surface of the clamping screw 31 is provided with an annular groove 33, a connecting plate 35 is rotatably installed inside the annular groove 33, a rear end of the clamping screw 31 is provided with a knob 32, the connecting plate 35 is in a triangular structure, three sides of the connecting plate 35 are parallelly provided with fixing bolts 351, a first connecting rod 36 is hinged on the surface of the fixing bolt 351, one end of the first connecting rod 36 away from the fixing bolt 351 is hinged on the telescopic rod 37, and a roller 38 is rotatably installed on the front side of one end of the telescopic rod 37 away from each other. By rotating the knob 32, the clamping screw 31 can be driven to move precisely in the axial direction; the ring groove 33 cooperates with the connecting plate 35 to make the connecting plate 35 move axially synchronously with the clamping screw 31; the rod transmission structure formed by the connecting plate 35, the fixing bolt 351 and the first connecting rod 36 can make the three telescopic rods 37 synchronously extend outward and press the inner annular surface of the impeller; the line contact between the roller 38 and the inner annular surface of the impeller can achieve stable centering and clamping without damaging the impeller; through the above-mentioned linkage and clamping process, the impeller can be kept in a precise coaxial position before the impeller is inserted into the volute, thereby significantly reducing the alignment time in the subsequent installation and improving the overall assembly efficiency.

[0026] See also Figure 1-5 , the connecting ring 5 is placed on the rear side of the vertical plate 22, the clamping screw 31 passes through the connecting ring 5, a slot 51 is provided on the surface of the connecting ring 5, and three strikers 52 are evenly arranged on the front surface of the connecting ring 5, and the strikers 52 pass through the extension tube 221. By distributing three strikers 52 on the surface of the connecting ring 5, uniform impact can be achieved when the impeller and the rotating shaft of the volute are docked; by cooperating with the slot 51 and the subsequent U-shaped groove 41, the striker 52 can be extended outward after the initial centering of the impeller and generate impact energy with the help of the elastic force of the tension spring 66; the synchronous action of the three strikers 52 can ensure that the impeller is evenly impacted to reduce the error caused by the unbalanced force; the overall positioning of the connecting ring 5, the vertical plate 22, and the extension tube 221 can provide precise guidance for the striker 52 before the impeller is inserted into the volute, thereby improving the control accuracy and stability of the interference installation.

[0027] See also Figure 4 and Figure 7, through holes 352 are provided at three corners of the surface of the connecting plate 35, and the striker 52 passes through the through holes 352, and the end of the striker 52 is pressed against the center of the impeller for installation. The distribution of the through holes 352 can enable the striker 52 to obtain precise movement guidance on the connecting plate 35; the direct pressing of the end of the striker 52 against the center of the impeller can enable the impeller to advance steadily during the interference fit process; the uniform action of the three strikers 52 can avoid the deflection of the impeller caused by uneven force; this precise layout can reduce the frequency of repeated centering and multiple knocking during the installation process, thereby improving the installation efficiency and accuracy.

[0028] See also Figure 3-6 A reinforcing rib plate 23 is symmetrically arranged between the back of the vertical plate 22 and the lifting plate 21, a fixed shaft 26 is arranged between the two reinforcing rib plates 23, and a swing plate 4 is rotatably mounted on the surface of the fixed shaft 26. The rigidity of the overall structure can be improved by adding the reinforcing rib plate 23 between the vertical plate 22 and the lifting plate 21; the swing plate 4 can be flexibly adjusted according to installation requirements by providing a rotation fulcrum for the swing plate 4 by the fixed shaft 26; and the deformation risk can be reduced during the installation of the impeller by improving the structural rigidity and mobility, and a stable environment can be created for the accurate force application of the striker 52.

[0029] See also Figure 6 and Fig. 9 A U-shaped groove 41 is provided on the top of the swing plate 4, and the U-shaped groove 41 is matched with the clamping groove 51. A handle groove 42 is provided below the surface of the swing plate 4. The precise matching of the U-shaped groove 41 and the clamping groove 51 can realize the outward movement and force accumulation process of the striker 52 after the impeller is centered; the setting of the handle groove 42 can make it easier for the operator to manipulate the swing plate 4 when fine-tuning the impeller and preparing for impact; this ergonomic design can provide better controllability and convenient operation during the interference installation process, reduce invalid actions and time consumption.

[0030] See also Figure 8 The back of the vertical plate 22 is equipped with an impact adjustment mechanism 6, which includes two bosses 61 for fixing the vertical plate 22 on the back, a double screw 62 is rotatably installed between the two bosses 61, and a moving block 63 is symmetrically installed on the surface of the double screw 62, and the two moving blocks 63 are respectively screwed on different thread surfaces. The pre-tensioning amount of the tension spring 66 can be accurately adjusted by the relative movement of the double screw 62 and the moving block 63; the impact force of the striker 52 on the impeller can be adjusted by changing the pre-tensioning force to meet the interference installation requirements of impellers of different sizes and materials; by integrating this mechanism on the back of the vertical plate 22, the overall structure can be simplified to improve the convenience of operation and maintenance.

[0031] See also Figure 8, the second connecting rod 64 is hinged on the surface of the moving block 63, and the ends of the two second connecting rods 64 are hinged on the horizontal plate 65. The surface of the horizontal plate 65 is connected with a tension spring 66, and the end of the tension spring 66 away from the horizontal plate 65 is connected to the swing plate 4. The second connecting rod 64 driven by the moving block 63 can adjust the position of the horizontal plate 65 synchronously when the double screw 62 is rotated; the initial stretching degree of the tension spring 66 is changed by the horizontal plate 65 to change the impact energy of the striker 52; through this, the impeller can obtain a suitable and controllable impact force when the interference fit is installed to avoid excessive stress on the impeller; through this precise adjustable design, flexible fine-tuning can be performed according to different working conditions to improve installation accuracy and safety.

[0032] See also Figure 1-9 The mobile lifting mechanism 1 includes a base plate 11, universal wheels 12 are installed at the four corners of the bottom of the base plate 11, a fixed seat 13 is installed on the upper surface of the base plate 11, a first connecting plate 14 is symmetrically hinged on the inner side of the fixed seat 13, and a connecting shaft 15 is installed at the end of the first connecting plate 14. By installing universal wheels 12 at the four corners of the base plate 11, the auxiliary fixture can be quickly and flexibly moved in the factory environment; the hinged structure of the fixed seat 13 and the first connecting plate 14 can achieve stable support of the impeller at different positions and heights; the connecting shaft 15 can provide support for the control screw 17 to achieve lifting adjustment; through the coordination of overall movement and height control, the impeller can be more smoothly aligned with the volute inlet, reducing the friction of the outer ring surface and improving the assembly accuracy and work efficiency.

[0033] See also Figure 1-3 , the surface of the connecting shaft 15 is hinged with a second connecting plate 16, and the ends of the two second connecting plates 16 facing away from the connecting shaft 15 are hinged at the bottom of the connecting platform 18, and the lifting plate 21 is fixed on the connecting platform 18. A control screw 17 is screwed in between the two connecting shafts 15, and the two connecting shafts 15 are screwed on different thread surfaces. Through the reverse thread cooperation between the control screw 17 and the two connecting shafts 15, the connecting platform 18 and the lifting plate 21 can be lifted and lowered smoothly when the control screw 17 is rotated; the hinged characteristics of the second connecting plate 16 can keep the impeller centered and stable when adjusting the height; through this flexible and precise adjustment method, the installation height of the volute can be quickly matched after the impeller is centered and clamped, thereby reducing repeated positioning and trial installation links and improving the overall efficiency of the installation process.

[0034] See also Figure 5A centering laser pen 34 is embedded in the front end face of the clamping screw 31, and the centering laser pen 34 is used to assist in centering. By embedding the centering laser pen 34 in the front end face of the clamping screw 31, an accurate beam reference can be provided when the impeller moves toward the volute; the deviation between the impeller center and the volute installation center can be quickly determined and fine-tuned through this laser reference; the centering laser pen 34 can greatly reduce the naked eye estimation error during the centering process, thereby improving the accuracy and efficiency of large impeller installation; through close linkage with the above-mentioned components, a clear and intuitive positioning reference can be provided during the entire process of impeller insertion and interference fit to improve the overall assembly quality and reliability.

[0035] Embodiment 2: In this embodiment, the initial precise centering of the impeller is achieved through the extension tube (material: Q235 carbon structural steel, outer diameter 200mm, wall thickness 5mm) and the ring (material: 40Cr steel, heat treated HRC45-50) structure at the front end of the fixed platform; three slide grooves (each slide groove width 10mm, depth 5mm) are evenly opened on the surface of the ring, and the centering clamping mechanism is composed of a clamping screw (pitch 2mm) made of 304 stainless steel, a connecting plate (equilateral triangle side length 80mm, thickness 8mm), a first connecting rod (length 50mm, diameter 8mm), a telescopic rod (diameter 10mm, length 60mm) and a roller (diameter 30mm, material GCr15 bearing steel). By turning the clamping screw through the knob, the telescopic rod can be extended outward and close to the inner ring surface of the impeller, so as to achieve precise centering before the impeller is inserted into the volute.

[0036] Test conditions: Environmental conditions: temperature 20±2℃, humidity 45±5% Impeller parameters: outer diameter 800mm, inner ring diameter 300mm Initial centering deviation: ±2mm Measuring accuracy: Precision laser centering instrument, accuracy ±0.01mm Experimental data table (unit: mm):

[0037] Experimental conclusion: By comparison, the coaxiality deviation is reduced from an average of about 0.30mm without the structure to an average of about 0.10mm in this embodiment, with an improvement rate of more than 66%. This solution effectively reduces the initial centering error and improves installation accuracy.

[0038] Related formula: Coaxiality deviation Δ=|X impeller axis-X volute axis| By comparing the Δ values, the improvement in alignment accuracy can be quantitatively described.

[0039] Embodiment 3: In this embodiment, the universal wheel (polyurethane material, diameter 100mm, rotation resistance coefficient f≈0.02), control screw (42CrMo material, pitch 2.5mm, strength grade 10.9) and connecting shaft (40Cr quenched and tempered) are used to realize the flexible movement and precise height adjustment of the fixture as a whole. After clamping, the height of the lifting plate can be adjusted within the range of ±20mm by rotating the control screw, so that the impeller can be quickly aligned with the inlet position of the volute.

[0040] Test conditions: Impeller and volute tolerance: impeller outer diameter 800mm, volute inlet inner diameter 805mm Operation method: One technician uses an electric wrench with a constant speed (torque 10N·m) Environmental conditions: temperature 20±2℃, humidity 50±5% Measurement parameters: insertion time (s), insertion force (N), change in roughness of the outer ring surface of the impeller after insertion Ra (μm) Experimental data table:

[0041] Experimental conclusion: This embodiment shortens the insertion time from 20s to about 11.6s, reduces the insertion force from 75N to about 43.8N, and reduces the wear Ra increment from 0.8μm to about 0.26μm, which significantly improves the installation smoothness and reduces friction and surface damage.

[0042] Related formula: F=μN (friction formula) In this embodiment, by improving the centering accuracy and flexible movement, the effective friction process and insertion force are equivalently reduced, so the insertion is faster and the wear is lighter.

[0043] Embodiment 4: This embodiment uses an impact adjustment mechanism (the twin screw 62 is made of 20CrMo material, carburized and quenched; the moving block is 6061 aluminum alloy; the horizontal plate is Q235 steel; the tension spring is spring steel, the elastic coefficient The swing plate is made of 40Cr, HRC45). The position of the moving block can be changed by adjusting the double screw, thereby changing the initial elongation x0 of the tension spring. When released, three strikers (GCr15 steel, end radius R=2mm) generate instantaneous impact energy E.

[0044] Assume E=(1 / 2)kx², when x=15mm, E is approximately 1.5J37.5J.

[0045] Test conditions: Material parameters: Impeller material ZG230-450 Volute interference: 0.05±0.01mm Measurement parameters: average impact force (N), impeller inclination deviation (°), interference fit success rate (%) Force sensor accuracy ±0.5N Experimental data table:

[0046] Experimental conclusion: By precisely adjusting the preload force of the firing pin, uniform and controllable impact can be achieved and tilt deviation can be reduced; the one-time success rate of interference fit is increased by more than 14%.

[0047] Related formula: E=(1 / 2)kx² By controlling x to change E, the impact energy can be controlled to achieve precise interference fit installation.

[0048] Embodiment 5: In this embodiment, a centering laser pen (wavelength 650nm, spot size ≤1mm, output power ≤5mW) is embedded in the front end of the clamping screw, and the laser point is aligned with the center of the volute before the impeller enters the volute, thereby improving the centering speed and accuracy.

[0049] Test conditions: Ambient illumination: 500lux Volute coaxiality tolerance: ±0.05mm Measurement parameters: final coaxiality error (mm), total installation time (s), first-time successful alignment rate (%), average of 5 times Experimental data table:

[0050] Experimental conclusion: With the assistance of a laser pen, the centering error is reduced by about 50%, the total installation time is reduced by about 50%, and the first-time success rate is increased from 80% to 100%, significantly simplifying the centering process and improving accuracy and efficiency.

[0051] Working principle: hoist the large-sized impeller next to the fixture, and make the inner annular surface of the impeller correspond to the three rollers 38 respectively, then rotate the knob 32 to drive the clamping screw 31 to rotate, and the axial movement of the clamping screw 31 can be controlled by rotating the thread of the clamping screw 31. Due to the cooperation between the connecting plate 35 and the annular groove 33, the connecting plate 35 and the clamping screw 31 can be synchronously moved axially, and the connecting plate 35 is controlled to move backward to push the telescopic rod 37 outward through the three first connecting rods 36. The telescopic rod 37 slides inside the slide groove 25. The T-shaped slide groove 25 can ensure that the telescopic rod 37 can only slide. At this time, the roller 38 can squeeze the inner annular surface of the impeller through the outward expansion of the telescopic rod 37 to achieve centering clamping. At this time, the impeller coincides with the center of the ring 24 and remains fixed. The roller 38 allows the impeller to rotate after clamping, so as to adjust the keyway position during installation requiring key cooperation.

[0052] The movement of the fixture as a whole can be controlled by the universal wheel 12 at the bottom to control the impeller to approach the volute, and the distance between the two connecting shafts 15 can be controlled by rotating the control screw 17 to achieve lifting and lowering, so as to adjust the height of the impeller after clamping. The centering laser pen 34 can be used to easily determine the height position, so that the laser point of the centering laser pen 34 corresponds to the center of the volute to be installed. At this time, since the extension tube 221 extends forward, the impeller can be driven into the volute by moving the fixture. The roller 38 clamps from the inside to the outside, so that there are no protrusions on the outer ring surface of the impeller, and then the impeller will not be hindered when entering the volute.

[0053] After the impeller and the volute rotating shaft are in place, the handle groove 42 is used to push the bottom of the swing plate 4 inward, and then the U-shaped groove 41 at the top is flipped outward, and the striker 52 is pulled outward by the cooperation of the U-shaped groove 41 and the card groove 51. At this time, the tension spring 66 is pulled and stored, and the force on the handle groove 42 is released. At this time, the stored force of the tension spring 66 is used to make the end of the striker 52 hit the impeller, so that the impeller and the volute rotating shaft are installed in place. The synchronous impact of the three strikers 52 can ensure that the impact force on the impeller is uniform, and the reciprocating impact on the impeller can achieve interference fit installation, thereby ensuring the accuracy of installation. The position of the cross plate 65 can be controlled by rotating the double screw 62, and then the pulling force on the tension spring 66 can be controlled, thereby adjusting the distance between the striker 52 and the impeller when no force is applied, thereby improving the flexibility of the fixture.

[0054] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An auxiliary jig for facilitating quick assembly of an impeller, characterized in that: The invention comprises a movable lifting mechanism (1) and a connecting ring (5), wherein the movable lifting mechanism (1) is used to control the position and height of an impeller, wherein a fixed platform (2) is installed on the top of the movable lifting mechanism (1), wherein the fixed platform (2) comprises a lifting plate (21), wherein a vertical plate (22) is fixed on the front side of the lifting plate (21), wherein an extension tube (221) is fixed on the upper surface of the front side of the vertical plate (22), wherein a circular ring (24) is arranged at the front end of the extension tube (221), and wherein three sliding grooves (25) are evenly arranged on the surface of the circular ring (24); A centering clamping mechanism (3) is installed on the surface of the circular ring (24), and the centering clamping mechanism (3) is used to center and clamp the impeller; The centering clamping mechanism (3) comprises a clamping screw (31) screwed through the center of the extension tube (221) and a telescopic rod (37) sliding inside the slide groove (25); a front end of the surface of the clamping screw (31) is provided with an annular groove (33); a connecting plate (35) is rotatably mounted inside the annular groove (33); a rear end of the clamping screw (31) is provided with a knob (32); the connecting plate (35) is in a triangular structure; three side surfaces of the connecting plate (35) are parallelly provided with fixing bolts (351); a first connecting rod (36) is hinged on the surface of the fixing bolt (351); one end of the first connecting rod (36) facing away from the fixing bolt (351) is hinged on the telescopic rod (37); and a roller (38) is rotatably mounted on the front side of one end of the telescopic rod (37) facing away from each other.

2. The auxiliary jig for facilitating quick assembly of an impeller according to claim 1, characterized in that: The connecting ring (5) is placed on the rear side of the vertical plate (22), the clamping screw (31) passes through the connecting ring (5), a clamping groove (51) is provided on the surface of the connecting ring (5), and three strikers (52) are evenly arranged on the front surface of the connecting ring (5), and the strikers (52) pass through the extension tube (221).

3. The auxiliary jig for facilitating quick assembly of an impeller according to claim 2, characterized in that: Through holes (352) are provided at three corners of the surface of the connection plate (35), the striker (52) passes through the through holes (352), and the end of the striker (52) is pressed and installed against the center of the impeller.

4. The auxiliary jig for facilitating quick assembly of an impeller according to claim 3 is characterized in that: A reinforcing rib plate (23) is symmetrically arranged between the back of the vertical plate (22) and the lifting plate (21), a fixed shaft (26) is arranged between the two reinforcing rib plates (23), and a swing plate (4) is rotatably mounted on the surface of the fixed shaft (26).

5. The auxiliary jig for facilitating quick assembly of an impeller according to claim 4, characterized in that: A U-shaped groove (41) is provided on the top of the swing plate (4), the U-shaped groove (41) is matched with the clamping groove (51), and a handle groove (42) is provided below the surface of the swing plate (4).

6. The auxiliary jig for facilitating quick assembly of an impeller according to claim 5, characterized in that: An impact adjustment mechanism (6) is installed on the back of the vertical plate (22), and the impact adjustment mechanism (6) comprises two bosses (61) on the back of the fixed vertical plate (22), a double screw (62) is rotatably installed between the two bosses (61), and moving blocks (63) are symmetrically installed on the surface of the double screw (62), and the two moving blocks (63) are respectively screwed on different thread surfaces.

7. The auxiliary jig for facilitating quick assembly of an impeller according to claim 6, characterized in that: A second connecting rod (64) is hinged on the surface of the moving block (63), and two ends of the second connecting rod (64) are hinged on a transverse plate (65). A tension spring (66) is connected to the surface of the transverse plate (65), and one end of the tension spring (66) facing away from the transverse plate (65) is connected to the swing plate (4).

8. The auxiliary jig for facilitating quick assembly of an impeller according to claim 1, characterized in that: The mobile lifting mechanism (1) comprises a base plate (11), universal wheels (12) are mounted at the four corners of the bottom of the base plate (11), a fixing seat (13) is mounted on the upper surface of the base plate (11), a first connecting plate (14) is symmetrically hinged on the inner side of the fixing seat (13), and a connecting shaft (15) is mounted at the end of the first connecting plate (14).

9. The auxiliary jig for facilitating quick assembly of an impeller according to claim 8, characterized in that: A second connecting plate (16) is hingedly connected to the surface of the connecting shaft (15); one end of the two second connecting plates (16) facing away from the connecting shaft (15) is hingedly connected to the bottom of the connecting platform (18); the lifting plate (21) is fixed on the connecting platform (18); a control screw (17) is laterally screwed between the two connecting shafts (15); and the two connecting shafts (15) are screwed on different threaded surfaces respectively.

10. The auxiliary jig for facilitating quick assembly of an impeller according to claim 1, characterized in that: A centering laser pen (34) is embedded in the front end surface of the clamping screw (31), and the centering laser pen (34) is used to assist centering.

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