Hydro-generator magnetic pole iron core assembling device and using method

Abstract

The invention discloses a hydro-generator magnetic pole iron core assembling device and a using method, and relates to the technical field of hydro-generators, the hydro-generator magnetic pole iron core assembling device is composed of a platform, a front pressing tire, a rear pressing tire, a pull rod, a front pressing tire, a positioning key, a rear pressing head and a hydraulic system, and is suitable for hydro-generator magnetic pole iron core assembling and pumped storage power generation motor magnetic pole iron core assembling. The device can simultaneously complete the lamination positioning and pressing work of the magnetic pole iron core punching sheet. When the tightening torque of the magnetic pole iron core screw rod is smaller than 500N. M, an operator uses a manual torque wrench to be matched with the device to tighten the magnetic pole iron core, and when the tightening torque of the magnetic pole iron core screw rod is larger than 500N. M, the operator uses an electric torque wrench to be matched with the device to tighten the magnetic pole iron core. The device has a wide application range, and can meet the assembling work of the magnetic pole iron core with the length within 2500mm and the width within 520mm. The device has the advantages of being high in efficiency, good in safety, convenient to assemble and disassemble, capable of being repeatedly used and low in cost.

Description

Technical Field

[0001] The invention relates to the technical field of hydro-generators, and in particular to a hydro-generator magnetic pole core assembly device and a use method, which is suitable for assembling magnetic pole cores of hydro-generators and pumped storage power generation motors. Background Art

[0002] The pole core of a hydro-turbine generator and a pumped-storage power generation motor is composed of several hundred to several thousand thin steel plates (pole core length) with a thickness of about 2 mm, which are stacked together and combined into one body by a tensioning screw with a certain pre-tightening force that passes through the inside of the punching sheet. The pre-tightening force of the tensioning screw is different for different unit speeds. With the diversification of hydro-turbine generator products, the size specifications of the pole core are increasing. At the same time, the requirements for large pre-tightening force of the pole core of pumped-storage products must be met. It is necessary to provide a pole core assembly device and a method of use that can meet a variety of size specifications and provide large pre-tightening force. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a hydro-turbine generator magnetic pole core assembly device and a method of use, which can meet the assembly work of magnetic pole cores of various sizes and specifications, and can provide a large preload force to meet the assembly work of magnetic pole cores of pumped storage power generation motors, and has the characteristics of high efficiency, convenient installation and disassembly, wide application range and low cost. The technical scheme of the present invention is: a hydro-turbine generator magnetic pole core assembly device, which is composed of a platform, front and rear pressure heads, a pull rod, a front pressure tire, a positioning key, a side plate, a rear pressure tire, and a hydraulic system. The front pressure tire is fixed to the platform by bolts, and the rear pressure tire is connected to the platform by a transverse T-slot. The rear pressure tire can slide freely in the T-slot of the platform. The pull rod passes through the front pressure tire and the rear pressure tire and is fixed to the support tube and the support tube. The hydraulic system is fixed to the end of the pull rod, the positioning key is fixed to the side plate by bolts, and the side plate is fixed to the platform by a longitudinal T-slot and T-screws. The front and rear pressure heads are respectively fixed to the front pressure tire and the rear pressure tire end faces by bolts.

[0004] In the above-mentioned hydro-generator pole core assembly device, the platform upper plane is provided with two transverse T-slots, multiple longitudinal T-slots, multiple T-slots are provided in the longitudinal T-slots, and two sets of threaded holes are provided at one end of the platform upper plane.

[0005] In the above-mentioned hydro-generator pole core assembly device, the front and rear pressure heads are composed of a first pressure plate, a second pressure plate, and a stop rod, and the stop rod and the second pressure plate are matched with a small gap.

[0006] In the above-mentioned hydro-generator magnetic pole core assembly device, the pull rod is made of forged steel 34CrNi3Mo, and a first thread and a second thread are respectively provided at both ends. The first thread cooperates with a nut fixing the hydraulic system, and the second thread cooperates with a nut fixing the rear tire.

[0007] In the above-mentioned hydro-turbine generator pole core assembly device, the front tire is composed of a transverse connecting plate, a support tube, a vertical rib plate, a vertical plate, and a bottom plate. The arc surfaces on both sides of the transverse connecting plate are respectively welded to the support tube to form a whole, the lower plane of the transverse connecting plate is welded to the vertical rib plate to form a whole, the vertical plate is respectively welded to the lower ends of the arc surfaces on both sides of the transverse connecting plate to form a whole, and the vertical rib plate, the vertical plate and the bottom plate are welded to form a whole.

[0008] In the above-mentioned hydro-generator pole core assembly device, the positioning key is composed of a first positioning bar and a second positioning bar, the first positioning bar is fixed to the upper end surface of the side plate with bolts, and the second positioning bar is fixed to the inner side surface of the side plate with bolts.

[0009] In the above-mentioned hydro-turbine generator pole core assembly device, the side plate is composed of a vertical plate, a rib plate, and a bottom plate. The vertical plate and the bottom plate are welded into a whole. The rib plates are evenly arranged on the upper plane of the bottom plate and welded into a whole with the vertical plate and the bottom plate. The bottom plate is provided with multiple bolt holes for fixing to the platform.

[0010] In the above-mentioned hydro-turbine generator pole core assembly device, the rear tire is composed of a transverse connecting plate, a support tube, a vertical plate, vertical ribs, and a slider. The arc surfaces on both sides of the transverse connecting plate are respectively welded to the support tube to form a whole, the lower plane of the transverse connecting plate is welded to the vertical plate to form a whole, two groups of vertical ribs are respectively welded at both ends of the vertical plate, and the vertical ribs, the vertical plate and the slider are welded to form a whole.

[0011] A method for using a hydro-generator pole core assembly device is as follows:

[0012] Step 1: Clean the dust and impurities on the surface of the platform, use special tools to clean the impurities in the transverse T-slot, longitudinal T-slot and threaded hole, and install an appropriate amount of T-screws in the longitudinal T-slot according to the length of the pole core.

[0013] Step 2, assemble the side panels. According to the length of the pole core and the length of a single side panel, select an appropriate number of side panels and place them on the platform. Pass the T-shaped screws through the screw holes of the side panels (600). Adjust the distance between the two side panels according to the width of the pole core and tighten the T-shaped screws.

[0014] Step 3: Hang the front tire press on the platform, fix it with bolts, and insert the slider of the rear tire press into the horizontal T-slot.

[0015] Step 4: Insert the pull rod into the support tube and the support tube, install the hydraulic system on the first threaded end of the pull rod, fix it with a nut, and screw the nut into the second threaded end.

[0016] Step 5: Assemble the front and rear pressure heads, and fix the first pressure plate to the front pressure tire near the magnetic pole core with bolts, and fix the first pressure plate to the rear pressure tire near the magnetic pole core with bolts. Fix the second pressure plate to the front pressure tire near the hydraulic system with bolts, and fix the second pressure plate to the outer side of the rear pressure tire with bolts.

[0017] Step 6, stack the pole core punching sheets, hang the pole pressure plates at both ends of the pole core on the upper end surface of the positioning key close to the ends on both sides, stack the punching sheets, and at the same time arrange the punching sheets to make their peripheries neat and consistent, install damping rings and damping strips, continue to stack the punching sheets, install the tensioning screws, and after the punching sheets are shaped to be qualified, start the hydraulic device, press the pole core according to the clamping force requirements of the pole core, tighten the tensioning screws with a manual torque wrench or an electric torque wrench according to the pre-tightening force requirements of the tensioning screws, and complete the entire pole core assembly process.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] It can meet the assembly work of magnetic pole cores of various sizes and specifications, and can provide large preload force to meet the assembly work of magnetic pole cores of pumped storage power generation motors. The platform and the side plates are connected by T-slots and T-screws, and the position of the side plates can be freely adjusted. It is suitable for magnetic pole cores of various widths; for magnetic pole cores of different heights, only the size of the positioning key needs to be adjusted to meet the assembly requirements. Because the platform is equipped with through transverse T-slots and multiple groups of longitudinal T-slots, and the end of the tie rod is processed with extra-long threads, it can meet the assembly work of magnetic pole cores of various lengths and specifications. Therefore, the device has the characteristics of high efficiency, convenient installation and disassembly, wide application range, and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The present invention is a detailed diagram of a magnetic pole core assembly device for a hydro-turbine generator.

[0021] Figure 2 Detailed drawing of the platform.

[0022] Figure 3 Detail of the platform T-screw

[0023] Figure 4 Detailed drawing of the front and rear pressure heads.

[0024] Figure 5 Detail of the tie rod.

[0025] Figure 6 Detailed diagram of the front tire.

[0026] Figure 7 This is a detailed drawing of the positioning key.

[0027] Figure 8 Detail of the side panel.

[0028] Fig. 9 Detailed diagram of the rear tire.

[0029] Fig.10 Detailed drawing of the magnetic pole core

[0030] Markings in the figure: 1-deformation process control module; 2-contact seal isolation module; 3-flow control valve; 100-platform; 200-front and rear pressure heads; 300-pull rod; 400-front; 500-positioning key; 600-side plate; 700-rear pressure tire; 800-hydraulic system; 900-magnetic pole core; 101-transverse T-slot; 102-longitudinal T-slot; 103-threaded hole; 104-T-screw; 201-first pressure plate; 202-second pressure plate; 203-stop rod; 30 1-first thread; 302-second thread; 401-transverse connecting plate; 402-supporting tube; 403-vertical rib plate; 404-vertical plate; 405-bottom plate; 501-first positioning strip; 502-second positioning strip; 601-vertical plate; 602-rib plate; 603-bottom plate; 701-transverse connecting plate; 702-supporting tube; 703-vertical plate; 704-vertical rib; 705-slider; 901-punching sheet; 902-tensioning screw; 903 magnetic pole pressure plate; 904 damping ring; 905 damping strip; DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different structures.

[0032] Specific implementation method 1: Figure 1 As shown, a hydro-turbine generator magnetic pole core assembly device is composed of a platform 100, front and rear pressure heads 200, a pull rod 300, a front pressure tire 400, a positioning key 500, a side plate 600, a rear pressure tire 700, and a hydraulic system 800. The front pressure tire 400 is fixed to the platform 100 by bolts, the rear pressure tire 700 is connected to the platform 100 by a transverse T-slot 101, and the rear pressure tire 700 can slide freely in the T-slot 101 of the platform 100. The pull rod 300 passes through the front pressure tire 400 and the rear pressure tire 700 and is fixed in the support tube 402 and the support tube 702. The hydraulic system 800 is fixed to the end of the pull rod 300, the positioning key 500 is fixed to the side plate 600 by bolts, the side plate (600) is fixed to the platform 100 by the longitudinal T-slot 102 and the T-screw 104, and the front and rear pressure heads 200 are respectively fixed to the end faces of the front pressure tire 400 and the rear pressure tire 700 by bolts.

[0033] In this embodiment, the pole pressure plate 903 and the punching sheet 901 are placed between the two side plates 600, and the relative positions of the pole pressure plate 903 and the punching sheet 901 are accurately determined by the positioning key 500. The punching sheet 901 needs to be shaped at any time during the stacking process, in order to ensure that there are no protruding punching sheets 901 on each surface of the assembled pole core 900, and the pole core 900 has good straightness. The length of the punching sheet 901 needs to be measured at any time during the stacking process to ensure that the final length of the pole core 900 is met. After the punching sheet 901 is stacked and shaped, the hydraulic system 800 is started and the pressure is slowly increased to the clamping force required by the design. During the pressure increase process of the hydraulic system 800, the pull rod 300 drives the rear pressure tire 700 and the front and rear pressure heads 200 to slowly move inward to clamp the punching sheet 901, and the tensioning screw 902 is inserted into the inner hole of the punching sheet 901. The end nut of the tensioning screw 902 is tightened with a manual torque wrench or an electric torque wrench.

[0034] Specific implementation method 2: This implementation method further defines the platform 100 described in specific implementation method 1. Figure 2 , Figure 3 As shown, in this embodiment, two transverse T-slots 101 are set on the plane of the platform 100, and multiple longitudinal T-slots 102 are set. The longitudinal T-slots 102 are provided with multiple T-screws 104, and two groups of threaded holes 103 are set at one end of the plane of the platform 100.

[0035] The platform 100 in this embodiment is made of Q235 thick steel plate. The transverse T-slot 101 is used to fix the rear tire 700, so that the rear tire 700 can slide freely in the transverse T-slot 101 to meet the assembly of pole cores of different lengths. A plurality of longitudinal T-slots 102 are provided to fix the side plates 600 on both sides, so that the width between the side plates 600 can be adjusted arbitrarily according to the width of the pole core 900.

[0036] Specific implementation scheme three, this implementation scheme further limits the front and rear pressure heads 200 described in implementation scheme one, such as Figure 4 As shown, in this embodiment, the front and rear pressure heads 200 are composed of a first pressure plate 201, a second pressure plate 202, and a blocking rod 203, and the blocking rod 203 and the second pressure plate 202 are matched with a small gap.

[0037] In this embodiment, the stop rod 203 is arranged on the end face of the second pressing plate 202. When the pre-tightening force of the tightening screw is large and an electric torque wrench is needed to tighten the nut, the stop rod 203 is used as the reaction point of the electric torque wrench.

[0038] Specific implementation scheme 4, this implementation scheme further limits the pull rod 300 described in implementation scheme 1, such as Figure 5 , Figure 7As shown, in this embodiment, the pull rod 300 is made of forged steel 34CrNi3Mo, and a first thread 301 and a second thread 302 are respectively provided at both ends. The first thread 301 cooperates with a nut that fixes the hydraulic system 800, and the second thread 302 cooperates with a nut that fixes the rear tire 700. The positioning key 500 is composed of a first positioning bar 501 and a second positioning bar 502. The first positioning bar 501 is fixed to the upper end surface of the side plate 600 with bolts, and the second positioning bar 502 is fixed to the inner side of the side plate 600 with bolts.

[0039] In this embodiment, the pull rods 300 and the positioning keys 500 on both sides need to maintain a certain safety distance to avoid mutual interference.

[0040] Specific implementation scheme 5, this implementation scheme further limits the side plate 600 described in implementation scheme 1, such as Figure 8 As shown, in this embodiment, the side plate 600 is composed of a vertical plate 601, a rib plate 602, and a bottom plate 603. The vertical plate 601 and the bottom plate 603 are welded into a whole. The rib plate 602 is evenly arranged on the upper plane of the bottom plate 603 and is welded into a whole with the vertical plate 601 and the bottom plate 603. The bottom plate 603 is provided with a plurality of bolt holes for fixing to the platform 100.

[0041] In this embodiment, the length of the side panels 600 is relatively short, which is convenient for assembling pole cores 900 of different lengths. For example, when the length of the pole core 900 is relatively long, the number of side panels 600 placed on each side increases. No matter how many sets of side panels 600 are placed on the platform 100, the engaging holes of the side panels 600 can correspond to the longitudinal T-slots 102 and T-screws 104 of the platform 100.

[0042] Specific implementation scheme six, this implementation scheme further limits the front tire pressure 400 described in implementation scheme one, such as Figure 6 As shown, in this implementation scheme, the front tire 400 is composed of a transverse connecting plate 401, a support tube 402, a vertical rib plate 403, a vertical plate 404, and a bottom plate 405. The arc surfaces on both sides of the transverse connecting plate 401 are respectively welded to the support tube 402 to form a whole, the lower plane of the transverse connecting plate 401 is welded to the vertical rib plate 403 to form a whole, the vertical plate 404 is respectively welded to the lower ends of the arc surfaces on both sides of the transverse connecting plate 401 to form a whole, and the vertical rib plate 403, the vertical plate 404 and the bottom plate 405 are welded to form a whole.

[0043] In this embodiment, the front pressure tire 400 is fixed to the plane of one end of the platform 100, close to the hydraulic system 800, serving as the fixed end of the clamping device of the pole core 900, and is also one of the supporting points of the pull rod 300.

[0044] Specific implementation scheme seven, this implementation scheme further limits the rear tire pressure 700 described in implementation scheme one, such as Fig. 9As shown, in this implementation scheme, the rear tire pressure 700 is composed of a transverse connecting plate 701, a support tube 702, a vertical plate 703, a vertical rib 704, and a slider 705. The arc surfaces on both sides of the transverse connecting plate 701 are respectively welded to the support tube 702 to form a whole, the lower plane of the transverse connecting plate 701 is welded to the vertical plate 703 to form a whole, two groups of vertical ribs 704 are respectively welded at both ends of the vertical plate 703, and the vertical ribs 704, the vertical plate 703 and the slider 705 are welded to form a whole.

[0045] In this embodiment, the rear pressure tire 700 is fixed in the transverse T-slot 101 of the platform 100 and can slide in the transverse T-slot 101, serving as the moving end of the clamping device of the pole core 900 and also one of the supporting points of the pull rod 300.

[0046] Specific implementation scheme eight, this implementation scheme is a step-by-step description of the method for using a hydro-turbine generator pole core assembly device in specific implementation scheme one. In this implementation scheme, step 1, clean the dust and impurities on the surface of the platform, use special tools to clean the impurities in the transverse T-slot 101, the longitudinal T-slot 102 and the threaded hole 103, and install an appropriate amount of T-screws 104 in the longitudinal T-slot 102 according to the length of the pole core 900.

[0047] Step 2, assemble the side panels 600. According to the length of the pole core 900 and the length of a single side panel 600, select an appropriate number of side panels 600 and place them on the platform 100. Pass the T-shaped screws 104 through the screw holes of the side panels (600). Adjust the distance between the two side panels 600 according to the width of the pole core 900 and tighten the T-shaped screws 104.

[0048] Step 3: Hang the front tire 400 on the platform 100 and fix it with bolts, and insert the slider 705 of the rear tire 700 into the transverse T-slot 101.

[0049] Step 4: insert the pull rod 300 into the support tube 402 and the support tube 702, install the hydraulic system at the first thread 301 end of the pull rod 300 and fix it with a nut, and screw the nut into the second thread 302 end.

[0050] Step 5: Assemble the front and rear pressure heads 200, and fix the first and second pressure plates 01 to the front pressure tire 400 near the magnetic pole core 900 with bolts, and fix the first and second pressure plates 01 to the rear pressure tire 700 near the magnetic pole core 900 with bolts. Fix the second pressure plate 202 to the front pressure tire 400 near the hydraulic system 800 with bolts, and fix the second pressure plate 202 to the outer side of the rear pressure tire 700 with bolts.

[0051] Step 6, stack the punching sheets of the pole core 900, hang the pole pressure plates at both ends of the pole core 900 on the upper end surface of the positioning key 500 close to the ends on both sides, stack the punching sheets 901, and at the same time arrange the punching sheets 901 to make their peripheries neat and consistent, install the damping ring 904 and the damping strip 905, continue to stack the punching sheets 901, install the tensioning screw 902, after the punching sheets 901 are shaped to be qualified, start the hydraulic device 800, press the pole core 900 according to the clamping force requirements of the pole core 900, tighten the tensioning screw 902 with a manual torque wrench or an electric torque wrench according to the pre-tightening force requirements of the tensioning screw 902, and complete the entire assembly process of the pole core 900.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A hydro-generator pole core assembly device and a method of use, characterized by: The invention comprises a platform (100), front and rear pressure heads (200), a pull rod (300), a front pressure tire (400), a positioning key (500), a side plate (600), a rear pressure tire (700), and a hydraulic system (800). The front pressure tire (400) is fixed to the platform (100) by bolts, and the rear pressure tire (700) is connected to the platform (100) by a transverse T-slot (101). The rear pressure tire (700) can slide freely in the T-slot (101) of the platform (100). The pull rod (300) is fixed to the platform (100) by bolts, and the rear pressure tire (700) is connected to the platform (100) by a transverse T-slot (101). ) passes through the front pressure tire (400) and the rear pressure tire (700) and is fixed in the support tube (402) and the support tube (702), the hydraulic system (800) is fixed to the end of the pull rod (300), the positioning key (500) and the side plate (600) are fixed by bolts, the side plate (600) and the platform (100) are fixed by longitudinal T-slots (102) and T-screws (104), and the front and rear pressure heads (200) are respectively fixed to the end faces of the front pressure tire (400) and the rear pressure tire (700) by bolts.

2. A hydro-generator pole core assembly device according to claim 1, characterized in that: The upper plane of the platform (100) is provided with two transverse T-slots (101), and a plurality of longitudinal T-slots (102). A plurality of T-slots (104) are arranged in the longitudinal T-slots (102). Two groups of threaded holes (103) are arranged at one end of the upper plane of the platform (100).

3. A hydro-generator pole core assembly device according to claim 1, characterized in that: The front and rear pressure heads (200) are composed of a first pressure plate (201), a second pressure plate (202), and a blocking rod (203), and the blocking rod (203) and the second pressure plate (202) are matched with a small gap.

4. A hydro-generator pole core assembly device according to claim 1, characterized in that: The pull rod (300) is made of forged steel 34CrNi3Mo, and has a first thread (301) and a second thread (302) at both ends. The first thread (301) cooperates with a nut for fixing the hydraulic system (800), and the second thread (302) cooperates with a nut for fixing the rear tire (700).

5. A hydro-generator pole core assembly device according to claim 1, characterized in that: The front tire pressing device (400) is composed of a transverse connecting plate (401), a supporting tube (402), a vertical rib plate (403), a vertical plate (404), and a bottom plate (405). The arc surfaces on both sides of the transverse connecting plate (401) are respectively welded to the supporting tube (402) to form a whole. The lower plane of the transverse connecting plate (401) is welded to the vertical rib plate (403) to form a whole. The vertical plate (404) is respectively welded to the lower ends of the arc surfaces on both sides of the transverse connecting plate (401) to form a whole. The vertical rib plate (403), the vertical plate (404) and the bottom plate (405) are welded to form a whole.

6. A hydro-generator pole core assembly device according to claim 1, characterized in that: The positioning key (500) is composed of a first positioning strip (501) and a second positioning strip (502); the first positioning strip (501) is fixed to the upper end surface of the side plate (600) by bolts, and the second positioning strip (502) is fixed to the inner side surface of the side plate (600) by bolts.

7. A hydro-generator pole core assembly device according to claim 1, characterized in that: The side plate (600) is composed of a vertical plate (601), a rib plate (602), and a bottom plate (603); the vertical plate (601) and the bottom plate (603) are welded into a whole; the rib plate (602) is evenly arranged on the upper plane of the bottom plate (603) and is welded to the vertical plate (601) and the bottom plate (603) to form a whole; the bottom plate (603) is provided with a plurality of bolt holes for fixing to the platform (100).

8. The hydro-generator pole core assembly device according to claim 1, characterized in that: The rear tire pressing device (700) is composed of a transverse connecting plate (701), a supporting tube (702), a vertical plate (703), vertical ribs (704), and a sliding block (705). The arc surfaces on both sides of the transverse connecting plate (701) are respectively welded to the supporting tube (702) to form a whole. The lower plane of the transverse connecting plate (701) is welded to the vertical plate (703) to form a whole. Two groups of vertical ribs (704) are respectively welded to both ends of the vertical plate (703). The vertical ribs (704), the vertical plate (703) and the sliding block (705) are welded to form a whole.

9. A method for using the hydro-generator pole core assembly device according to any one of claims 1 to 8, characterized in that: The usage process is as follows: Step 1: clean the dust and impurities on the surface of the platform (100), use a special tool to clean the impurities in the transverse T-slot (101), the longitudinal T-slot (102) and the threaded hole (103), and install an appropriate number of T-screws (104) in the longitudinal T-slot (102) according to the length of the magnetic pole core (900). Step 2, assemble the side panels (600), select an appropriate number of side panels (600) and place them on the platform (100) according to the length of the pole core (900) and the length of a single side panel (600), pass the T-shaped screws (104) through the screw holes of the side panels (600), adjust the distance between the two side panels (600) according to the width of the pole core (900), and tighten the T-shaped screws (104). Step 3: Hang the front tire pressing device (400) on the platform (100), fix it with bolts, and insert the slider (705) of the rear tire pressing device (700) into the transverse T-shaped groove (102). Step 4: Insert the pull rod (300) into the support tube (702) and the support tube (402), install the hydraulic system (800) on the first threaded end (301) of the pull rod (300), fix it with a nut, and screw the nut into the second threaded end (301). Step 5, assemble the front and rear pressure heads (200), fix the first pressure plate (201) to the front pressure tire (400) near the magnetic pole core (900) with bolts, and fix the first pressure plate (201) to the rear pressure tire (700) near the magnetic pole core (900) with bolts. Fix the second pressure plate (202) to the front pressure tire (400) near the hydraulic system (800) with bolts, and fix the second pressure plate (202) to the outer side of the rear pressure tire (700) with bolts. Step 6, stack the punching sheets (901) of the pole core (900), hang the pole pressure plates (903) at both ends of the pole core (900) on the upper end surface of the positioning key (500) close to the two side ends, stack the punching sheets (901), and at the same time, arrange the punching sheets (901) to make their peripheries neat and consistent, install the damping ring (904) and the damping strip (905), continue to stack the punching sheets (901), install the tensioning screw (902), after the punching sheets (901) are shaped to be qualified, start the hydraulic device (800), press the pole core (900) according to the clamping force requirement of the pole core (900), tighten the tensioning screw (902) with a manual torque wrench or an electric torque wrench according to the pre-tightening force requirement of the tensioning screw (902), and complete the entire assembly process of the pole core (900). When the electric torque wrench is used, a stopper rod (203) needs to be installed on the end surface of the second pressing plate (202) as a reaction point of the electric torque wrench.

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