Maintenance equipment and method for main distributing valve of speed regulator

Abstract

The invention discloses a speed regulator main distributing valve maintenance device and method.The speed regulator main distributing valve maintenance device comprises a lifting device and a maintenance device, the lifting device comprises a lifting frame and a lifting hook used for lifting a main distributing valve, the lifting hook is slidably connected with the lifting frame, and the maintenance device comprises a maintenance table and a thrust telescopic part; the overhaul stand is arranged on one side of the lifting frame in the sliding direction of the lifting hook and provided with an overhaul station used for containing the main distributing valve, the thrust telescopic part is provided with a fixed section and a telescopic section which can move relatively, the fixed section is connected with the overhaul stand, and the thrust telescopic part is arranged on the upper side of the overhaul stand and has a preset distance from the overhaul stand; the center line of the telescopic section coincides with the center line of the valve element. According to the overhauling equipment for the main distributing valve of the speed regulator, the main distributing valve is transferred to the overhauling table through the lifting device, the risks of personnel injury and equipment damage can be reduced, the valve element is slowly pushed out of the valve body through the thrust telescopic piece, and the risk of damage to the valve element or the valve body can be reduced.

Description

Technical Field

[0001] This invention relates to the technical field of governor maintenance in hydropower plants, specifically to a governor main pressure distribution valve maintenance equipment and method. Background Technology

[0002] As a core component for current conversion in the hydropower plant's governor system, the main pressure regulating valve requires regular disassembly and maintenance. Maintenance personnel first remove the valve's fixing bolts, then use a triangular derrick to lift the valve vertically. Afterward, the valve must be manually transported to the maintenance area. Due to its significant weight, the valve is prone to tipping or falling during transport, posing a considerable risk of personnel injury and equipment damage. Furthermore, disassembly and maintenance of the main pressure regulating valve requires removing the valve core before reassembly. The removal of the valve core, typically done by hammering with a copper rod, can easily damage the valve core or body. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, embodiments of the present invention propose a speed governor main pressure valve maintenance device. The main pressure valve is transferred to the maintenance platform using a lifting device, which can reduce the risk of personnel injury and equipment damage. The valve core is slowly pushed out of the valve body using a thrust telescopic component, which can reduce the risk of damage to the valve core or valve body.

[0005] The governor main pressure regulating valve maintenance equipment of this invention includes a lifting device and a maintenance device. The lifting device includes a lifting frame and a hook for lifting the main pressure regulating valve. The hook is slidably connected to the lifting frame. The maintenance device includes a maintenance platform and a thrust telescopic member. The maintenance platform is located on one side of the lifting frame along the sliding direction of the hook. The maintenance platform has a maintenance station for placing the main pressure regulating valve. The thrust telescopic member has a relatively movable fixed section and a telescopic section. The fixed section is connected to the maintenance platform. The thrust telescopic member is located on the upper side of the maintenance platform and has a preset distance from the maintenance platform, so that the center line of the telescopic section coincides with the center line of the valve core.

[0006] In some embodiments, the lifting frame includes a crossbeam, a first leg, and a second leg, the first leg and the second leg being gradually spaced apart from each other from top to bottom, the crossbeam being disposed above the first leg and the second leg, the first leg and the second leg being connected to the crossbeam, the crossbeam having a slide rail, and the hook being slidably connected to the slide rail.

[0007] In some embodiments, the number of hooks is multiple, and the multiple hooks are arranged at intervals along the extension direction of the slide.

[0008] In some embodiments, the maintenance device further includes a mounting frame, which includes a first mounting portion and a second mounting portion. The first mounting portion is connected to the upper side of the maintenance platform, and the second mounting portion is connected to the fixed section of the thrust telescopic member.

[0009] In some embodiments, the maintenance device further includes a guide, the guide including a cylindrical portion and a connecting portion for connecting the valve body, the cylindrical portion having a through-hole cavity, the centerline of the cavity coinciding with the centerline of the telescopic section.

[0010] In some embodiments, the cavity wall has a guide groove, which is spirally arranged along the centerline of the cavity.

[0011] In some embodiments, the number of guide grooves is multiple, and the multiple guide grooves are arranged at circumferential intervals along the cavity.

[0012] In some embodiments, the cylindrical cavity includes a guide section disposed at one end of the cylindrical cavity near the telescopic section, and the cross-section of the guide section gradually increases in the direction away from the connecting portion.

[0013] In some embodiments, the thrust telescopic member is a hydraulically driven member, comprising a cylinder and a piston rod. The piston rod slidably passes through the cylinder and divides the inner cavity of the cylinder into a rod chamber and a rodless chamber. The cylinder forms the fixed section, and the piston rod forms the telescopic section. The maintenance equipment further includes a hydraulic system comprising an oil tank, an oil pump, a solenoid directional valve, and a one-way throttling module. The solenoid directional valve has an inlet, a return port, a first connecting port, and a second connecting port. The inlet of the oil pump is connected to the oil tank, the outlet of the oil pump is connected to the inlet, the return port is connected to the oil tank, the first connecting port is connected to the rod chamber, and the second connecting port is connected to the rodless chamber through the one-way throttling module, so as to control the extension speed of the piston rod using the one-way throttling module.

[0014] The governor main pressure regulating valve maintenance method of this embodiment of the invention uses the governor main pressure regulating valve maintenance device described above, and the governor main pressure regulating valve maintenance method includes the following steps: Connect the main pressure regulating valve to the hook; Control the hook to move closer to the maintenance platform; Place the main pressure regulating valve at the maintenance station, remove the valve cover of the main pressure regulating valve, and make the center line of the valve core coincide with the center line of the telescopic section; The telescopic section is controlled to extend beyond the fixed section, and the telescopic section abuts against the end face of the valve core, pushing the valve core out of the valve body to complete the removal of the valve core.

[0015] The governor main pressure regulating valve maintenance equipment of this invention utilizes a lifting device to transfer the main pressure regulating valve to the maintenance platform. Compared with the manual transfer method in related technologies, this is more convenient and labor-saving, reducing the risk of personnel injury and equipment damage. Furthermore, when removing the valve core, placing the main pressure regulating valve on the maintenance station and adjusting its orientation ensures that the center of the valve core is aligned with the center of the telescopic section. Then, a constant thrust along the centerline is applied to the valve core by the thrust telescopic component, slowly pushing the valve core out of the valve body. Compared with the method of removing the valve core by striking it with a copper rod in related technologies, this reduces the risk of damage to the valve core or valve body. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view of the main pressure regulating valve after the valve cover has been removed, according to an embodiment of the present invention.

[0017] Figure 2 This is a top view of the main pressure regulating valve of one embodiment of the present invention after the valve cover has been removed.

[0018] Figure 3 This is a schematic diagram of the lifting device of the speed governor main pressure valve maintenance equipment according to an embodiment of the present invention.

[0019] Figure 4 This is a schematic diagram of the maintenance device of the governor main pressure valve maintenance equipment according to an embodiment of the present invention.

[0020] Figure 5 This is a side view of the lifting device of the governor main pressure valve maintenance equipment according to an embodiment of the present invention.

[0021] Figure 6 This is a top view of the maintenance device of the governor main pressure valve maintenance equipment according to an embodiment of the present invention.

[0022] Figure 7 A schematic diagram showing the connection between the mounting frame and the thrust telescopic component of the governor main pressure valve maintenance equipment according to an embodiment of the present invention.

[0023] Figure 8 This is a schematic diagram of the structure of the guide component of the governor main pressure valve maintenance equipment according to an embodiment of the present invention.

[0024] Figure 9 This is a schematic diagram of the hydraulic principle of the hydraulic system of the governor main pressure valve maintenance equipment according to an embodiment of the present invention.

[0025] Figure label: 1. Lifting device; 11. Lifting frame; 111. Crossbeam; 1111. Slide rail; 112. First leg; 113. Second leg; 114. Adjustable base; 115. Cross brace; 12. Hook; 13. Rolling assembly; 131. Connecting frame; 132. Roller; 2. Maintenance device; 21. Maintenance platform; 211. Maintenance station; 212. Positioning bolt; 213. Casters; 22. Thrust telescopic component; 221. Fixed section; 222. Telescopic section; 223. Rod-mounted cavity; 224. Rodless cavity; 23. Mounting frame; 231. First mounting part; 232. Second mounting part; 233. Diagonal brace; 24. Guide component; 241. Cylindrical part; 2411. Cylindrical cavity; 2412. Guide groove; 242. Connecting part; 243. Connecting bolt; 3. Hydraulic system; 31. Oil tank; 32. Oil pump; 321. Motor; 33. Solenoid directional valve; 331. Oil inlet; 332. Oil return port; 333. First connecting port; 334. Second connecting port; 34. Throttle valve; 35. Check valve; 36. Relief valve; 361. Pressure gauge; 200. Main pressure regulating valve; 201. Valve body; 2011. Mounting hole; 2012. Connection hole; 202. Bushing; 203. Valve core. Detailed Implementation

[0026] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0027] It is known that the main pressure distribution valve 200 of the hydropower plant governor includes a valve body 201, a bushing 202, a valve core 203, and a valve cover, such as Figure 1 As shown, this is a cross-sectional view of the main pressure regulating valve 200 after the valve cover has been removed. Figure 2 The figure shows a top view of the main pressure regulating valve 200 after the valve cover has been removed. The bottom of the valve body 201 has multiple mounting holes 2011, and both ends of the valve body 201 have connecting holes 2012 for connecting the valve cover. The main pressure regulating valve 200 can be fixed in the speed controller through the mounting holes 2011. The bushing 202 is located inside the valve body 201, and the valve core 203 is installed in the bushing 202.

[0028] like Figure 3 and Figure 4As shown, the speed governor main pressure valve maintenance equipment of this embodiment includes a lifting device 1 and a maintenance device 2. The lifting device 1 includes a lifting frame 11 and a hook 12 for lifting the main pressure valve 200. The hook 12 is slidably connected to the lifting frame 11. The maintenance device 2 includes a maintenance platform 21 and a thrust telescopic member 22. The maintenance platform 21 is located on one side of the lifting frame 11 along the sliding direction of the hook 12. The maintenance platform 21 has a maintenance station 211 for placing the main pressure valve 200. The thrust telescopic member 22 has a fixed section 221 and a telescopic section 222 that can move relative to each other. The fixed section 221 is connected to the maintenance platform 21. The thrust telescopic member 22 is located on the upper side of the maintenance platform 21 and has a preset distance from the maintenance platform 21, so that the center line of the telescopic section 222 coincides with the center line of the valve core 203.

[0029] The speed governor main pressure valve maintenance equipment of this invention is suitable for maintenance of the main pressure valve 200 of the speed governor in a hydropower plant. First, the main pressure valve 200 is connected to the hook 12, and the hook 12 is controlled to move the main pressure valve 200 towards the maintenance platform 21, transferring the main pressure valve 200 to the maintenance station 211 on the maintenance platform 21. Then, the valve cover of the main pressure valve 200 is removed, and the center line of the valve core 203 is made to coincide with the center line of the telescopic section 222. The telescopic section 222 is controlled to extend towards the main pressure valve 200, so that the telescopic section 222 abuts against the end face of the valve core 203, thereby pushing the valve core 203 out of the valve body 201, thus realizing the removal of the valve core 203.

[0030] The governor main pressure regulating valve maintenance equipment of this invention uses a lifting device 1 to transfer the main pressure regulating valve 200 to the maintenance platform 21. Compared with the method of manually transferring the main pressure regulating valve 200 in related technologies, this is more convenient and labor-saving, and can reduce the risk of personnel injury and equipment damage. In addition, when removing the valve core 203, placing the main pressure regulating valve 200 on the maintenance station 211 and adjusting its position can align the center of the valve core 203 with the center of the telescopic section 222. Then, the thrust telescopic member 22 applies a constant thrust along its centerline to the valve core 203, slowly pushing the valve core 203 out of the valve body 201. Compared with the method of using a copper rod to knock and remove the valve core 203 in related technologies, this can reduce the risk of damage to the valve core 203 or the valve body 201.

[0031] It is understandable that the relative positions of the main pressure regulating valve 200, the lifting device 1, and the maintenance platform 21 should meet the following requirements: after the main pressure regulating valve 200 is lifted, the main pressure regulating valve 200 can be moved laterally to the upper side of the maintenance platform 21 by using the hook 12, and then the main pressure regulating valve 200 can be placed in the maintenance position 211, and the main pressure regulating valve 200 can be fixed in the maintenance position 211 by using the positioning bolts 212.

[0032] Optionally, the centerline of the telescopic section 222 is the centerline of the thrust telescopic member 22. The aforementioned preset distance refers to the distance between the centerline of the thrust telescopic member 22 and the upper side of the inspection platform 21. This preset distance is equal to the distance between the centerline of the valve core 203 and the upper side of the inspection platform 21.

[0033] In some embodiments, the lifting frame 11 includes a crossbeam 111, a first leg 112 and a second leg 113, with the first leg 112 and the second leg 113 gradually moving away from each other from top to bottom. The crossbeam 111 is located above the first leg 112 and the second leg 113, and both the first leg 112 and the second leg 113 are connected to the crossbeam 111. The crossbeam 111 has a slide rail 1111, and the hook 12 is slidably connected to the slide rail 1111.

[0034] Optionally, the crossbeam 111, the first leg 112, and the second leg 113 are all made of steel profiles.

[0035] Specifically, such as Figure 3 As shown, the crossbeam 111 is horizontally arranged, and the first leg 112 and the second leg 113 form a leg group. There are two leg groups, which are arranged at intervals along the length of the crossbeam 111 and are respectively located close to both ends of the crossbeam 111.

[0036] like Figure 5 As shown, the first leg 112 and the second leg 113 gradually move apart from top to bottom. The upper ends of the first leg 112 and the second leg 113 are detachably connected to the two sides of the crossbeam 111 by bolts. The lower ends of the first leg 112 and the second leg 113 are each provided with an adjusting base 114. The height of the first leg 112 and the second leg 113 can be adjusted by adjusting the base 114, so that the lifting frame 11 is placed horizontally. In addition, a horizontal brace 115 is provided between the first leg 112 and the second leg 113. The horizontal brace 115 extends horizontally and is located near the lower ends of the first leg 112 and the second leg 113. Its two ends are detachably connected to the first leg 112 and the second leg 113 by bolts. This forms a highly stable lifting frame 11, providing stable support for the crossbeam 111.

[0037] Optionally, the length of the crossbeam 111 and the spacing between the two outrigger assemblies are determined based on the width of the governor return oil tank 31 and the extension dimension of the maintenance platform 21 along the sliding direction of the hook 12, and are not limited here.

[0038] like Figure 5As shown, the cross-section of the beam 111 is C-shaped and the opening faces downwards. The slide 1111 is formed inside the beam 111. The upper end of the hook 12 is connected to a rolling assembly 13, which includes rollers 132 and a connecting frame 131. There are four rollers 132, which are divided into two groups. The two groups of rollers 132 are arranged at intervals along the length of the slide 1111 and are both connected to the connecting frame 131. The upper end of the hook 12 passes through the downward-facing opening of the beam 111 and is connected to the connecting frame 131, thereby enabling the hook 12 to slide along the slide 1111.

[0039] In some embodiments, there are multiple hooks 12, and the multiple hooks 12 are arranged at intervals along the extension direction of the slide rail 1111.

[0040] Specifically, such as Figure 3 As shown, the hook 12 and four rollers 132 form a set of lifting points. There are two hooks 12, thus forming two sets of lifting points. One set of lifting points is used to lift the main pressure regulating valve 200, and the other set of lifting points is used to counterweight during the lifting of the main pressure regulating valve 200, thereby improving the overall stability and reliability of the main pressure regulating valve 200 during lateral transfer.

[0041] In some embodiments, the maintenance device 2 further includes a mounting frame 23, which includes a first mounting portion 231 and a second mounting portion 232. The first mounting portion 231 is connected to the upper side of the maintenance platform 21, and the second mounting portion 232 is connected to the fixed section 221 of the thrust telescopic member 22.

[0042] Specifically, such as Figure 2 and Figure 4 As shown, the outer contour of the maintenance platform 21 is rectangular, which includes a maintenance frame and casters 213 located on the lower side of the frame. The maintenance work station 211 is provided on the upper side of the maintenance frame. There are four casters 213, which facilitate the movement of the maintenance platform 21 and adjust the relative position of the maintenance platform 21 and the lifting frame 11.

[0043] like Figure 2 and Figure 4 As shown, the maintenance station 211 is provided with multiple positioning holes, which correspond one-to-one with the mounting holes 2011 of the main pressure regulating valve 200. The main pressure regulating valve 200 can be fixed in the maintenance station 211 by using the positioning bolts 212, so as to realize the positioning and installation of the main pressure regulating valve 200.

[0044] like Figure 4 and Figure 5As shown, the mounting bracket 23 includes two mutually perpendicular plates, which respectively form the first mounting portion 231 and the second mounting portion 232. The first mounting portion 231 is fitted to the upper side of the inspection platform 21 and is detachably connected to the inspection platform 21 by four bolts. The second mounting portion 232 extends vertically upward, and the thrust telescopic member 22 extends horizontally. The end face of its fixed section 221 away from the telescopic section 222 is detachably connected to the second mounting portion 232 by multiple locking bolts. The multiple locking bolts are evenly distributed around the circumference of the fixed section 221, which can improve the stability of the thrust telescopic member 22 during installation. In addition, a diagonal brace 233 is provided between the second mounting portion 232 and the thrust telescopic member 22. One end of the diagonal brace 233 is connected to the second mounting portion 232, and the other end is connected to the fixed section 221 of the thrust telescopic member 22, which can support the thrust telescopic member 22 and further improve the stability of the thrust telescopic member 22.

[0045] Therefore, by installing the inspection frame at the inspection station 211 and fixing it with the positioning bolts 212, and installing the thrust telescopic component 22 on the mounting frame 23, it can be ensured that the center line of the thrust telescopic component 22 coincides with the center line of the valve core 203. Then, the thrust telescopic component 22 is used to apply a thrust along its center line to the valve core 203, so that the valve core 203 is smoothly pushed out of the valve body 201, thereby removing the valve core 203.

[0046] Optionally, the mounting bracket 23 is made of angle steel.

[0047] In some embodiments, the maintenance device 2 further includes a guide 24, which includes a cylindrical portion 241 and a connecting portion 242 for connecting the valve body 201. The cylindrical portion 241 has a through-hole cavity 2411, the center line of which coincides with the center line of the telescopic section 222.

[0048] It is known that after the main pressure regulating valve 200 is overhauled, it needs to be reassembled. When the valve core 203 is put back into the valve body 201, the relevant technology usually relies on the maintenance personnel to manually align the center. Due to the high assembly precision between the valve core 203 and the bushing 202, and the limitation of the technical level of the maintenance personnel, the installation efficiency of the valve core 203 is low, and rework occurs frequently.

[0049] By setting a guide 24 connected to the valve body 201, the center line of the valve core 203, the center line of the cylinder cavity 2411, and the center line of the telescopic section 222 are made to coincide. The valve core 203 is placed in the cylinder cavity 2411, and then the valve core 203 is slowly pushed into the bushing 202 of the valve body 201 by the thrust telescopic member 22. This ensures that the center of the valve core 203 is aligned with the center of the bushing 202, thereby improving the installation efficiency and effect of the valve core 203.

[0050] Optionally, the cavity wall dimensions of the cylinder 2411 are the same as the inner wall dimensions of the bushing 202.

[0051] Specifically, such as Figure 4 and Figure 8 As shown, the cylindrical part 241 is cylindrical and the connecting part 242 is rectangular plate-shaped. The cylindrical part 241 and the connecting part 242 are integrally formed. The connecting part 242 has four through holes, which correspond one-to-one with the four connecting holes 2012 on the end face of the valve body 201 for connecting the valve cover. The connecting holes 2012 are threaded holes, and the guide 24 can be installed by four connecting bolts 243.

[0052] First, insert the valve core 203 into the cylinder cavity 2411, then connect the guide 24 to the valve body 201. After that, activate the thrust telescopic member 22, and the telescopic section 222 extends, allowing the valve core 203 to be slowly pushed into the bushing 202, thus realizing the installation of the valve core 203.

[0053] In some embodiments, the cavity wall of the cylindrical cavity 2411 has a guide groove 2412, which is arranged spirally along the center line of the cylindrical cavity 2411.

[0054] In some embodiments, there are multiple guide grooves 2412, which are arranged at circumferential intervals along the cylindrical cavity 2411.

[0055] Specifically, such as Figure 8 As shown, the cross-section of the guide groove 2412 is rectangular, and multiple guide grooves 2412 are evenly spaced along the circumference of the cylindrical cavity 2411. During the process of inserting the valve core 203 into the cylindrical cavity 2411, the valve core 203 can rotate along the spiral guide groove 2412 into the cylindrical cavity 2411, which is more conducive to the smooth entry of the valve core 203 into the cylindrical cavity 2411. In addition, during the process of inserting the valve core 203 into the cylindrical cavity 2411, turbine oil can also be applied to the cavity wall of the cylindrical cavity 2411.

[0056] During the process of pushing the valve core 203 into the bushing 202 using the thrust telescopic component 22, turbine oil can be sprayed onto the guide groove 2412 using a spray bottle. The turbine oil can flow along the guide groove 2412 to the cavity wall between the valve core 203 and the cylinder 2411, so that the valve core 203 can smoothly and easily enter the bushing 202 of the main pressure regulating valve 200.

[0057] In some embodiments, the cylindrical cavity 2411 includes a guide section (not shown in the figure), which is located at one end of the cylindrical cavity 2411 near the telescopic section 222, and the cross-section of the guide section gradually increases in the direction away from the connecting portion 242.

[0058] By setting a guide section, a tapered opening is provided at one end of the cylinder cavity 2411 away from the connecting part 242. This tapered opening can provide a guiding effect for the valve core 203 to enter the cylinder cavity 2411, thereby making it easier to insert the valve core 203 into the cylinder cavity 2411.

[0059] Optionally, the taper of the conical opening is 1° to 2°, preferably 2°.

[0060] In some embodiments, the thrust telescopic member 22 is a hydraulically driven member, which includes a cylinder and a piston rod. The piston rod is slidably inserted through the cylinder and divides the inner cavity of the cylinder into a rod chamber 223 and a rodless chamber 224. The cylinder forms a fixed section 221, and the piston rod forms a telescopic section 222. The maintenance equipment also includes a hydraulic system 3, which includes an oil tank 31, an oil pump 32, an electromagnetic directional valve 33, and a one-way throttling module. The electromagnetic directional valve 33 has an oil inlet 331, an oil return port 332, a first connecting port 333, and a second connecting port 334. The inlet of the oil pump 32 is connected to the oil tank 31, the outlet of the oil pump 32 is connected to the oil inlet 331, the oil return port 332 is connected to the oil tank 31, the first connecting port 333 is connected to the rod chamber 223, and the second connecting port 334 is connected to the rodless chamber 224 through the one-way throttling module to control the extension speed of the piston rod.

[0061] Optionally, the thrust telescopic component 22 can be a hydraulic cylinder or a relay.

[0062] Optionally, such as Figure 4 As shown, hydraulic components such as oil tank 31 and oil pump 32 are installed on the base plate of the maintenance platform.

[0063] Specifically, such as Figure 9 As shown, the oil pump 32 is connected to a motor 321, which provides power for the operation of the oil pump 32. High-pressure hoses are used for the connections between the oil pump 32 inlet and oil tank 31, the oil pump 32 outlet and oil inlet 331, the oil return port 332 and oil tank 31, the first connecting port 333 and rod chamber 223, the second connecting port 334 and one-way throttling module, and the one-way throttling module and rodless chamber 224. Both the rod chamber 223 and rodless chamber 224 of the thrust telescopic member 22 are equipped with quick connectors to enable quick connection between the thrust telescopic member 22 and the hydraulic system 3.

[0064] The electromagnetic directional valve 33 has a cross position on side a and a parallel position on side b. When side a is energized, the electromagnetic directional valve 33 is in the cross position. At this time, the oil inlet 331 is connected to the second communication port 334, and the oil return port 332 is connected to the first communication port 333. The oil pump 32 can pump the oil in the oil tank 31 into the rodless chamber 224, and the oil in the rod chamber 223 flows back to the oil tank 31, thereby pushing the piston rod to extend. When side b is energized, the electromagnetic directional valve 33 is in the parallel position. At this time, the oil inlet 331 is connected to the first communication port 333, and the oil return port 332 is connected to the second communication port 334. The oil pump 32 can pump the oil into the rod chamber 223, and the oil in the rodless chamber 224 flows back to the oil tank 31, thereby pushing the piston rod to retract.

[0065] The one-way throttling module includes a throttle valve 34 and a check valve 35, which are connected in parallel. The throttle valve 34 controls the oil flow rate by controlling the cross-sectional area of ​​the oil passage, thereby controlling the speed at which the piston rod moves outward, so as to achieve smooth and slow disassembly and assembly of the valve core 203. The check valve 35 provides a fast channel for the return of oil in the rodless chamber 224, which is used to act quickly when the piston rod retracts.

[0066] The hydraulic system 3 also includes a relief valve 36, which is connected to a pressure gauge 361. The relief valve 36 is installed between the outlet and the inlet 331 of the oil pump 32. The relief valve 36 has an overflow threshold. When the pressure of the hydraulic system 3 reaches the overflow threshold, the relief valve 36 is activated to release the overpressure oil to the oil tank 31, thereby preventing the hydraulic system 3 from operating under overpressure. The overflow threshold of the relief valve 36 can be adjusted according to the requirements of the hydraulic system 3, and is not limited here.

[0067] The speed governor main pressure valve 200 maintenance device 2 of this embodiment of the invention has the following effects: (1) By replacing manual labor with equipment to transport the main pressure regulating valve 200, the risk of damage during the disassembly, assembly and transportation of the main pressure regulating valve 200 is greatly reduced, ensuring a safe working environment for construction personnel, while improving work efficiency and reducing the frequency of rework.

[0068] (2) A constant external force can be applied to the valve core 203 by the thrust telescopic component 22, so that the valve core 203 of the main pressure regulating valve 200 of the speed controller can be removed or installed into the bushing 202 smoothly and slowly, which replaces the risk of damaging the valve core 203 and tearing the bushing 202 by striking the valve core 203 with a copper rod.

[0069] (3) The hydraulic system 3 of the present invention can ensure that the hydraulic system 3 does not operate under overpressure by setting the relief valve 36. The extension section 222 of the thrust extension component 22 can be controlled to extend and retract smoothly by the throttle valve 34, and the valve core 203 can be disassembled and installed smoothly and slowly to prevent irreversible mechanical damage to the outer surface of the valve core 203 and the inner surface of the bushing 202 caused by excessive speed.

[0070] The method for overhauling the main pressure regulating valve 200 of the speed controller according to this embodiment of the invention involves using a lifting device 1 to transfer the main pressure regulating valve 200 to the maintenance platform 21. The speed governor main pressure regulating valve 200 maintenance method of this embodiment of the invention uses the speed governor main pressure regulating valve 200 maintenance device 2 in any of the above embodiments. The speed governor main pressure regulating valve 200 maintenance method includes the following steps: S1: Connect the main pressure regulating valve 200 to the hook 12; S2: Control the hook 12 to move closer to the inspection platform 21; S3: Place the main pressure regulating valve 200 in the maintenance station 211, remove the valve cover of the main pressure regulating valve 200, and make the center line of the valve core 203 coincide with the center line of the telescopic section 222. S4: Control the telescopic section 222 to extend out of the fixed section 221, the telescopic section 222 abuts against the end face of the valve core 203, and pushes the valve core 203 out of the valve body 201, thus completing the removal of the valve core 203.

[0071] The speed governor main pressure regulating valve 200 maintenance method of this embodiment utilizes the lifting device 1 to transfer the main pressure regulating valve 200 to the maintenance platform 21. Compared with the method of manually transferring the main pressure regulating valve 200 in related technologies, this method is more convenient and labor-saving, reducing the risk of personnel injury and equipment damage. Furthermore, when removing the valve core 203, placing the main pressure regulating valve 200 on the maintenance station 211 and adjusting its orientation allows the center of the valve core 203 to be aligned with the center of the telescopic section 222. Then, a constant thrust along the centerline is applied to the valve core 203 by the thrust telescopic member 22, slowly pushing the valve core 203 out of the valve body 201. Compared with the method of using a copper rod to knock and remove the valve core 203 in related technologies, this method reduces the risk of damage to the valve core 203 or the valve body 201.

[0072] Specifically, connecting the main pressure regulating valve 200 to the hook 12 involves: first, removing the fixing bolts connecting the main pressure regulating valve 200 to the speed controller, then using slings to tie the valve covers on both sides of the main pressure regulating valve 200, with the middle of the slings connected to the hook 12 via a hand-operated hoist, and then lifting the main pressure regulating valve 200 using the hand-operated hoist, after which step S2 can be performed.

[0073] After the overhaul of the main pressure regulating valve 200 is completed, the overhaul method of the governor's main pressure regulating valve 200 also includes the following steps: S5: Insert the valve core 203 into the cylindrical cavity 2411 of the guide 24, and connect the connecting part 242 of the guide 24 to the connecting hole 2012 on the end face of the main pressure regulating valve 200. S6: Activate the thrust telescopic component 22, and use the telescopic section 222 of the thrust telescopic component 22 to apply thrust to the valve core 203, so that the valve core 203 is installed into the bushing 202 of the main pressure regulating valve 200, and the assembly of the valve core 203 and the valve body 201 is completed.

[0074] It is understandable that the above description of the equipment for overhauling the main pressure regulating valve of the speed controller also applies to the overhaul method of the main pressure regulating valve 200 of the speed controller, and will not be repeated here.

[0075] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0076] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0077] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0078] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0079] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0080] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A maintenance device for the main pressure distribution valve of a speed governor, characterized in that, This equipment is suitable for overhauling the main pressure regulating valve of a hydropower plant speed governor. The main pressure regulating valve includes a valve body and a valve core. The overhaul equipment includes: A lifting device, comprising a lifting frame and a hook for lifting the main pressure regulating valve, the hook being slidably connected to the lifting frame; The maintenance device includes a maintenance platform and a thrust telescopic component. The maintenance platform is located on one side of the lifting frame along the sliding direction of the hook. The maintenance platform has a maintenance station for placing the main pressure regulating valve. The thrust telescopic component has a relatively movable fixed section and a telescopic section. The fixed section is connected to the maintenance platform. The thrust telescopic component is located on the upper side of the maintenance platform and has a preset distance from the maintenance platform, so that the center line of the telescopic section coincides with the center line of the valve core.

2. The speed controller main pressure valve maintenance equipment according to claim 1, characterized in that, The lifting frame includes a crossbeam, a first leg, and a second leg, which are gradually spaced apart from each other from top to bottom. The crossbeam is located above the first leg and the second leg, and both the first leg and the second leg are connected to the crossbeam. The crossbeam has a slide rail, and the hook is slidably connected to the slide rail.

3. The speed controller main pressure valve maintenance equipment according to claim 2, characterized in that, The number of hooks is multiple, and the multiple hooks are arranged at intervals along the extension direction of the slide.

4. The speed governor main pressure valve maintenance equipment according to claim 1, characterized in that, The maintenance device also includes a mounting frame, which includes a first mounting part and a second mounting part. The first mounting part is connected to the upper side of the maintenance platform, and the second mounting part is connected to the fixed section of the thrust telescopic member.

5. The speed governor main pressure valve maintenance equipment according to claim 1, characterized in that, The maintenance device also includes a guide, which includes a cylindrical portion and a connecting portion for connecting the valve body. The cylindrical portion has a through-hole cavity, the centerline of which coincides with the centerline of the telescopic section.

6. The speed governor main pressure valve maintenance equipment according to claim 5, characterized in that, The cavity wall has guide grooves, which are spirally arranged along the center line of the cavity.

7. The speed governor main pressure valve maintenance equipment according to claim 6, characterized in that, The number of guide grooves is multiple, and the multiple guide grooves are arranged at intervals along the circumference of the cylinder cavity.

8. The speed governor main pressure valve maintenance equipment according to claim 5, characterized in that, The cylindrical cavity includes a guide section, which is located at one end of the cylindrical cavity near the telescopic section, and the cross-section of the guide section gradually increases in the direction away from the connecting part.

9. The speed governor main pressure valve maintenance equipment according to any one of claims 1-8, characterized in that, The thrust telescopic component is a hydraulically driven component, which includes a cylinder and a piston rod. The piston rod is slidably inserted through the cylinder and divides the inner cavity of the cylinder into a rod-side cavity and a rodless cavity. The cylinder forms the fixed section, and the piston rod forms the telescopic section. The maintenance equipment also includes a hydraulic system, which includes an oil tank, an oil pump, a solenoid directional valve, and a one-way throttling module. The solenoid directional valve has an oil inlet, an oil return port, a first connecting port, and a second connecting port. The oil pump's inlet is connected to the oil tank, its outlet is connected to the oil inlet, and its oil return port is connected to the oil tank. The first connecting port is connected to the rod chamber, and the second connecting port is connected to the rodless chamber through the one-way throttling module, so as to control the extension speed of the piston rod using the one-way throttling module.

10. A method for overhauling the main pressure distribution valve of a speed governor, characterized in that, The governor main pressure regulating valve maintenance device according to any one of claims 1-9, the governor main pressure regulating valve maintenance method includes the following steps: Connect the main pressure regulating valve to the hook; Control the hook to move closer to the maintenance platform; Place the main pressure regulating valve at the maintenance station, remove the valve cover of the main pressure regulating valve, and make the center line of the valve core coincide with the center line of the telescopic section; The telescopic section is controlled to extend beyond the fixed section, and the telescopic section abuts against the end face of the valve core, pushing the valve core out of the valve body to complete the removal of the valve core.

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