Method for assembling a cross-flow pole core

Abstract

The application relates to the technical field of hydraulic turbines and discloses a method for assembling and pressing a tubular magnetic pole core, which comprises the following steps: 1, preassembling the magnetic pole core; 2, assembling and pressing the magnetic pole core according to the preassembling result: sequentially mounting a front baffle, a magnetic pole lamination with a shoe part and a rear baffle, hoisting the magnetic pole core into a stacking and pressing mold; dismounting the rear baffle, assembling the magnetic pole lamination without the shoe part, re-pressing after the magnetic pole pressing plate is replaced at the position of the rear baffle; welding the magnetic pole pressing plate and the core rod; hoisting out the magnetic pole core, turning over, mounting the magnetic pole pressing plate; hoisting out the stacking and pressing mold after the welding is completed; drilling the holes of the damping rings at the two ends and the magnetic pole pressing plate; removing the welding slag, the welding bumps and polishing the welding seams to be flat. The magnetic pole core can be pressed tightly, and the assembly and pressing tightness is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of water turbine technology, and more specifically to a method for pressurizing a through-flow magnetic pole core. Background Technology

[0002] The magnetic pole core is an important component of the rotor assembly of a hydro-generator. The magnetic pole core of a axial-flow turbine unit differs in structure from that of vertical and horizontal turbine units. The axial-flow magnetic pole core is long and narrow, consisting of multiple stacked magnetic pole laminations with magnetic pole pressure plates at both ends. A core rod passes through the middle, and after compression, the core rod is welded firmly to the magnetic pole pressure plates.

[0003] Chinese document CN109067112B discloses a method for assembling a stepped magnetic pole core for a water pump motor, including the following steps: 1) Place the base plate horizontally, set the lower pad and left and right angle irons on the base plate, insert the positioning pin at the joint between the base plate and the left and right angle irons, and tighten the connecting bolts; 2) Install the lower magnetic pole pressure plate; 3) Install four tie rods on the base plate; 4) According to the different dimensions of the stepped part of the boot, put in different magnetic pole pieces, and use the left and right angle irons to position the width of the magnetic pole pieces; 5) Magnetic pole pieces After stacking to the correct height, place the upper magnetic pole pressure plate on the upper end face of the magnetic pole lamination, and then place the upper pressure block on the upper end face of the upper magnetic pole pressure plate; 6) Place the whole assembly into the hydraulic press for pressure application. After reaching the hydraulic pressure, drive limit wedges between the lower pad block and the magnetic pole lamination and between the upper pressure block and the magnetic pole lamination, and tighten the upper and lower adjustment wedges; 7) Remove the upper pressure block, weld the pull rod and the upper magnetic pole pressure plate, as well as the damping strip and damping ring, and remove the base plate and the lower pad block; 8) Turn it around and weld the pull rod, damping strip, and damping ring on the other end.

[0004] Shortcomings of existing technology: In the process of assembling magnetic pole cores, the pressing process of magnetic pole cores is particularly important. Existing technology cannot ensure that the magnetic pole cores can be pressed tightly, which easily leads to the problem of insufficient pressing tightness. Summary of the Invention

[0005] To address the technical problem of insufficient compaction of magnetic pole cores, this invention provides a method for compacting a through-flow magnetic pole core, comprising the following steps: 1. Pre-compiling the magnetic pole core and determining the number of magnetic pole laminations to be stacked in each segment; 2. Press the magnetic pole core according to the pre-assembly results: 2.1. Fix one end of the mandrel to the front baffle, install the magnetic pole pieces with shoe parts in sequence, and then press the rear baffle onto the other end of the mandrel to form a magnetic pole core. The magnetic pole core is then hoisted into the stacking mold. 2.2 Remove the rear baffle, install the pole piece without the boot, and install the damping strip with the seamless steel tube inside the pole core. Adjust the length of the damping strip at both ends to be symmetrical along the center line of the pole core, and install damping rings at both ends. 2.3 After replacing the magnetic pole pressure plate in the position of the rear baffle, tighten it again. Set tension bolts on the core rod and magnetic pole lamination to tighten the core rod and magnetic pole lamination. 2.4 Weld the magnetic pole plate and the core rod under compressed and tensioned conditions; 2.5. After hoisting out the magnetic pole core, turn it around and install it into the stacking mold, then remove the front baffle. Install the magnetic pole pressure plate at the position of the front baffle. Check and correct the M side of the magnetic pole pressure plate to be on the same horizontal plane as the N side of the magnetic pole lamination. 2.6. Weld the magnetic pole plate and core rod under the compressed state, and lift out the stacking mold after welding is completed; 3. Place the magnetic pole core vertically and flat, place a shim between the damping ring and the magnetic pole core, straighten the damping ring and weld it firmly, remove the shim, remove the welding slag and weld beads, and grind the weld seam smooth. 4. Draw the pin hole machining line on the plane of the damping ring, and drill and ream the pin holes of the damping ring and magnetic pole pressure plate at both ends; 5. Press the pin into the hole and weld it securely. Remove the welding slag and weld beads, and grind the weld seam smooth.

[0006] To facilitate pressing, 1.1. After fastening the front baffle to the core rod, stack the magnetic pole pieces; when stacking until only 10mm of the core rod is exposed, connect and fasten the rear baffle to the upper end of the core rod, and apply pressure to the magnetic pole pieces through the bolts on the rear baffle. 1.2. The pre-assembled magnetic pole core is lifted into the assembled stacking mold through the lifting holes on the rear baffle; the rear baffle is placed at the outer end of the hydraulic press. 1.3 After hoisting into the stacking mold, remove the rear baffle and place the pole piece without the boot section between the core rod and the rear baffle; 1.4. Apply pressure using a hydraulic press; 1.5. Lift out the magnetic pole core, check the misalignment of the core rod screw hole and the square hole of the lamination, and determine the actual number of magnetic pole laminations to be stacked in each section.

[0007] Preferably, 1.1 the boot parts adjacent to each other of different magnetic pole laminations are colored with a marker to facilitate dimensional measurement during stacking.

[0008] Preferably, 1.4. In order to ensure the tightness of the installation, a pad is placed between the magnetic pole core and the back baffle. After the magnetic pole core is pressed tightly, the tightness is checked to ensure that it meets the product requirements. Then, the back baffle and the magnetic pole core are fastened with bolts.

[0009] The present invention has the following beneficial effects: 1. It can quickly install and press the magnetic pole laminations onto the magnetic pole core. Through the cooperation of the front and rear baffles, the magnetic pole core and laminations are always in a state of compression and tension, and it ensures that the magnetic pole core can be pressed tightly, avoiding the problem of insufficient tightness. Attached Figure Description

[0010] Figure 1This is a schematic diagram of the pre-assembled structure of the through-flow magnetic pole core of the present invention; Figure 2 This is a schematic diagram of the pressurized structure of the through-flow magnetic pole core of the present invention; Figure 3 This is a schematic diagram of the pre-assembled state of the through-flow magnetic pole core of the present invention; Figure 4 This is a schematic diagram of the pressurized state of the through-flow magnetic pole core of the present invention; Figure 5 A schematic diagram of a magnetic pole piece with a boot-shaped part; Figure 6 This is a schematic diagram of a magnetic pole piece without a boot. Detailed Implementation

[0011] The following detailed description illustrates the specific implementation method: 1. The reference numerals in the accompanying drawings of the instruction manual include: 1. Magnetic pole lamination; 2. Magnetic pole core; 3. Front baffle; 4. Core rod; 5. Rear baffle; 6. Lifting hole; 7. Stacking mold; 8. Pad; 9. Seamless steel pipe; 10. Damping strip; 11. Damping ring; 12. Bolt; 13. Tensioning bolt; 14. Magnetic pole pressure plate.

[0012] Example 1 like Figure 1-6 As shown, a method for pressing a through-flow magnetic pole core includes the following steps: 1. Clean and inspect, removing any remaining burrs and dirt; prepare all necessary tools, fixtures, and measuring instruments; take out all parts and clean the oil and residual burrs from their surfaces; 2. After adjusting the spot welding machine and determining the parameters such as air pressure and current, spot weld the magnetic pole piece 1 and grind down the spot welding protrusion: 3. Classify the magnetic pole pieces 1 according to their serial numbers and weigh them; 4. Pre-assemble the magnetic pole core 2, determine the number of magnetic pole laminations 1 to be stacked in each section, and color the adjacent boots of different magnetic pole laminations 1 with a marker to facilitate dimensional measurement during stacking: 4.1 After fastening the front baffle 3 to the core rod 4 with bolts 12, stack the magnetic pole pieces 1; when stacking until only 10mm of the core rod 4 is exposed, connect and fasten the rear baffle 5 to the upper end of the core rod 4, and apply pressure to the magnetic pole pieces 1 with bolts 12 on the rear baffle 5 to stack as many magnetic pole pieces 1 as possible into the core rod 4. 4.2. The pre-assembled magnetic pole core 2 is lifted into the assembled stacking mold 7 through the lifting hole 6 on the rear baffle 5; the rear baffle 5 is placed at the outer end of the hydraulic press. 4.3 After hoisting into the stacking mold 7, remove the rear baffle 5 and place the magnetic pole punch 1 without the boot part between the core rod 4 and the rear baffle 5; 4.4 Apply pressure with the hydraulic press, place the pad 8 between the magnetic pole core 2 and the back baffle 5, press the magnetic pole core 2 tightly, check that the tightness meets the product requirements, and then use bolts 12 to fasten the back baffle 5 and the magnetic pole core 2. 4.5. Lift out the magnetic pole core 2, check the misalignment of the screw hole of the core rod 4 and the square hole on the magnetic pole lamination 1, and determine the actual number of magnetic pole laminations 1 to be stacked in each section. 5. Press the magnetic pole core 2 according to the pre-assembly results: 5.1. Fix one end of the core rod 4 to the front baffle 3 with bolts 12, then install the magnetic pole punch 1 with the boot part in sequence, and then press the rear baffle 5 to the other end of the core rod 4 with bolts 12 to form the magnetic pole core 2. The magnetic pole core 2 is hoisted into the stacking mold 7. 5.2 Remove the rear baffle 5, install the pole piece 1 without the boot, and install the damping strip 10 with the seamless steel tube 9 into the pole core 2. Adjust the length of the two ends of the damping strip 10 to be symmetrical along the center line of the pole core 2, and install the damping rings 11 at both ends. 5.3 After replacing the magnetic pole pressure plate 14 with the rear baffle 5, tighten it again. Set tension bolts 13 on the core rod 4 and the magnetic pole punch 1. The tension bolts 13 are set at intervals of one hole to tighten the core rod 4 and the magnetic pole punch 1. 5.4 Weld the magnetic pole plate 14 and the core rod 4 under compressed and tensioned conditions; 5.5. After hoisting out the magnetic pole core 2, turn it around and install it into the stacking mold 7, then remove the front baffle 3. Install the magnetic pole pressure plate 14 at the position of the front baffle 3. Check and adjust so that the M surface of the magnetic pole pressure plate 14 is on the same horizontal plane as the N surface of the magnetic pole punch 1. Check that the dimensions, tightness, torsion, and straightness meet the requirements of the drawings. 5.6. Weld the magnetic pole plate 14 and the core rod 4 under the compressed state. After welding, lift out the stacking mold 7. 6. Place the magnetic pole core 2 vertically and flat to prevent it from tipping over. Place a 2mm shim between the damping ring 11 and the magnetic pole core 2. Align the damping ring 11 and weld it firmly with silver and copper. Remove the shim, remove the welding slag and weld beads, and grind the weld seam to make it smooth. 7. Draw the pin hole machining line on the plane of the damping ring 11, and drill and ream the pin holes of the damping ring 11 and the magnetic pole pressure plate 14 at both ends. 8. Press the pin into the pin hole, cooperate with the welder, and weld it firmly with silver and copper according to the drawing. Remove the welding slag and weld beads, and grind the weld seam smooth.

[0013] The above descriptions are merely embodiments of the present invention. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, under the guidance of this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention. These should also be considered within the scope of protection of the present invention, and will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A method for pressing a through-flow magnetic pole core, characterized in that, Includes the following steps; Step 1: Pre-assemble the magnetic pole core and determine the number of magnetic pole laminations to be stacked in each section; Step 1.1: After fastening the front baffle to the core rod, stack the magnetic pole pieces; when the core rod protrudes 10mm, connect and fasten the rear baffle to the upper end of the core rod, and apply pressure to the magnetic pole pieces through the bolts on the rear baffle. Step 1.2: Lift the pre-assembled magnetic pole core into the assembled stacking mold through the lifting holes on the rear baffle; place the rear baffle at the outer end of the hydraulic press. Step 1.3: After hoisting into the stacking mold, remove the back baffle and place the pole piece without the shoe part between the core rod and the back baffle; Step 1.4: Apply pressure with the hydraulic press; Step 1.5: Lift out the magnetic pole core, check the misalignment of the core rod screw hole and the square hole of the lamination, and determine the actual number of magnetic pole laminations to be stacked in each section; Step 2: Install and press the magnetic pole core according to the pre-installation results: Step 2.1: Fix one end of the mandrel to the front baffle, install the magnetic pole pieces with shoe parts in sequence, and then press the rear baffle onto the other end of the mandrel to form a magnetic pole core. The magnetic pole core is then hoisted into the stacking mold. Step 2.2: Remove the rear baffle, install the pole piece without the boot, and install the damping strip with the seamless steel tube inside the pole core. Adjust the length of the damping strip at both ends to be symmetrical along the center line of the pole core, and install damping rings at both ends. Step 2.3: Replace the magnetic pole pressure plate in the position of the rear baffle and tighten it again. Set tension bolts on the core rod and magnetic pole punch to tighten the core rod and magnetic pole punch. Step 2.4: Weld the magnetic pole plate and the core rod under compressed and tensioned conditions; Step 2.5: Lift out the magnetic pole core, turn it around and put it into the stacking mold, then remove the front baffle. Install the magnetic pole pressure plate at the position of the front baffle. Check and correct so that the M side of the magnetic pole pressure plate and the N side of the magnetic pole lamination are on the same horizontal plane. Step 2.6: Weld the magnetic pole plate and core rod under the compressed state. After welding, lift out the stacking mold. Step 3: Place the magnetic pole core vertically and flat, place a shim between the damping ring and the magnetic pole core, straighten the damping ring and weld it firmly, remove the shim, remove the welding slag and weld beads, and grind the weld seam smooth. Step 4: Draw the pin hole machining line on the plane of the damping ring, and drill and ream the pin holes of the damping ring and the magnetic pole pressure plate at both ends. Step 5: Press the pin into the pin hole and weld it securely. Remove the welding slag and weld beads, and grind the weld seam smooth.

2. The method for pressing a through-flow magnetic pole core according to claim 1, characterized in that: Step 1.1 also includes coloring the boot sections adjacent to different magnetic pole pieces with a marker.

3. The method for pressing a through-flow magnetic pole core according to claim 1 or 2, characterized in that: Step 1.4: Applying pressure with the hydraulic press includes placing a pad between the pole core and the back baffle, pressing the pole core tightly, checking its tightness, and then securing the back baffle to the pole core with bolts.

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