A method for repairing a digital cylinder of a cylindrical valve servo

Abstract

The invention relates to the technical field of water turbine cylinder valves, and aims to solve the problems of large workload, long construction period and serious impact on the operation time of a water turbine generator set in an existing maintenance method for a cylinder valve servomotor digital cylinder, and provides a maintenance method for a cylinder valve servomotor digital cylinder; the maintenance method comprises: after the unit is shut down, the cylinder valve is fully opened, and after the cylinder valve control mode is switched to a "cut-off" position, the cylinder valve cylinder body is lifted by a servomotor that has not been repaired, and the servomotor digital cylinder maintenance work is performed; the invention realizes the maintenance of the cylinder valve servomotor digital cylinder under the conditions that the water turbine tail water is not drained, the cylinder valve mechanical lock spindle is not installed, and the technical water supply system is not stopped, and the maintenance method of the invention has small workload, short construction period, small impact on the operation time of the water turbine generator set, few working members are required, and no environmental pollution is caused.

Description

Technical Field

[0001] The invention relates to the technical field of water turbine cylinder valves, and in particular to a method for repairing a cylinder valve servomotor digital cylinder. Background Art

[0002] The digital cylinder of the cylindrical valve servomotor is the core component for controlling the cylindrical valve. Whether the state of the digital cylinder is good or not determines whether the cylindrical valve system can work normally. During the long-term operation of the equipment, the digital cylinder needs to be regularly inspected and repaired, such as replacing the internal valve body seal and checking the degree of wear of the valve core. The digital cylinder may also have defects such as seal oil leakage during daily operation. At this time, the digital cylinder needs to be inspected and repaired in advance. The existing maintenance method is to install a mechanical lock spindle on the cylindrical valve body, lift the cylindrical valve body through the mechanical lock spindle, keep the cylindrical valve in the fully open position, and then inspect the relay digital cylinder. To install the cylindrical valve mechanical lock spindle, the tail water of the unit must be drained before it can be carried out, so the existing cylindrical valve servomotor digital cylinder inspection needs to be carried out after the tail water of the unit is drained. The implementation process of the existing maintenance method is as follows:

[0003] (1) The unit is shut down and the turbine is drained.

[0004] (2) Fully open the cylinder valve, remove the cylinder valve mechanical lock plug plate, and install the cylinder valve mechanical lock plug.

[0005] (3) Close the connecting valve between the oil supply ring pipe of the cylindrical valve servo and the pressure tank, and close the connecting valve between the oil return ring pipe and the oil return tank.

[0006] (4) Remove the electrical equipment on the digital cylinder.

[0007] (5) Remove the oil inlet pipe, lower chamber oil supply pipe and oil return pipe of the servomotor digital cylinder.

[0008] (6) Remove the digital cylinder from the servomotor.

[0009] (7) Repair the digital cylinder.

[0010] (8) Reinstall the digital cylinder onto the servomotor.

[0011] (9) Reinstall the oil inlet pipe, lower chamber oil supply pipe, and oil return pipe of the servomotor digital cylinder.

[0012] (10) Reinstall the electrical equipment on the digital cylinder.

[0013] (11) Open the connecting valve between the oil supply ring pipe of the cylindrical valve servo and the pressure tank, and open the connecting valve between the oil return ring pipe and the oil return tank.

[0014] (12) Debug the relay digital cylinder.

[0015] (13) Remove the mechanical lock of the cylindrical valve and install the mechanical lock plug of the cylindrical valve.

[0016] (14) Fill the turbine with water.

[0017] The above steps are only the linear duration of the maintenance of the relay digital cylinder. In addition to the maintenance of the relay digital cylinder, the technical water supply system, the main shaft sealing system, etc. must also be shut down due to the need to drain the unit. After the above systems are put back into operation, it is necessary to rearrange the test, adjust the data, etc., involving many points and a wide range of aspects, a large construction scope, a long cycle, and the number of downtime days required, which affects the equivalent availability factor of the equipment. In summary, the existing maintenance methods have the following disadvantages:

[0018] (1) The construction period is long, more than 10 days.

[0019] (2) The turbine discharge needs to fall through the upstream gate, tailwater gate, etc., which causes a lot of work.

[0020] (3) When the turbine is draining water, the unit needs to be put into maintenance and the drainage pump needs to run for a long time, resulting in high energy consumption.

[0021] (4) There are many equipments that are shut down, which seriously affects the generating time of the units.

[0022] Therefore, the existing relay digital cylinder maintenance requires the unit to be drained in advance, the cylinder valve mechanical lock spindle is installed, the mechanical lock spindle is removed after the maintenance is completed, and the unit is filled with water after the mechanical lock spindle plug is installed. The existing maintenance method has a large workload and a long construction period, which seriously affects the operation time of the hydro-turbine generator unit. Summary of the invention

[0023] The present invention aims to provide a method for overhauling a digital cylinder of a cylindrical valve servomotor, so as to solve the problem that the existing method for overhauling a digital cylinder of a cylindrical valve servomotor has a large workload, a long construction period and seriously affects the operation time of a hydro-generator set.

[0024] The present invention is achieved by adopting the following technical solutions:

[0025] The present invention provides a method for repairing a digital cylinder of a cylindrical valve servomotor, comprising the following steps:

[0026] S1: Control the unit to shut down and conduct a single-action test of the cylinder valve servo to determine whether the cylinder valve lifting rod has defects. If there are defects, deal with the defects first. If there are no defects, open the cylinder valve to the full open position and switch the control mode of the cylinder valve to "cut-off";

[0027] S2: Close the oil inlet valve on the oil inlet pipe connected to the digital cylinder and the oil return valve on the oil return pipe connected to the digital cylinder;

[0028] S3: Relieve the residual pressure in the digital cylinder;

[0029] S4: Remove the electrical equipment on the digital cylinder;

[0030] S5: Remove the oil pipe joint on the digital cylinder;

[0031] S6: Remove the mounting bolts of the digital cylinder base;

[0032] S7: dismantle the digital cylinder;

[0033] S8: Dismantle and overhaul the digital cylinder;

[0034] S9: After the digital cylinder is overhauled, reinstall the digital cylinder and each oil pipe joint;

[0035] S10: Shake the valve core manual operating lever clockwise to put the valve core of the digital cylinder in the open position;

[0036] S11: Open the oil return valve and the oil inlet valve, and observe and confirm that the open-cavity pressure gauge at the open-cavity pressure measuring hole of the servomotor is under pressure, and the closed-cavity pressure gauge at the closed-cavity pressure measuring hole of the servomotor is not under pressure;

[0037] S12: Open the cavity of the relay to exhaust air;

[0038] S13: Shake the manual operating rod of the valve core counterclockwise to put the valve core of the digital cylinder in the closed position, and exhaust the servomotor cavity. After the exhaust is completed, shake the manual operating rod of the valve core clockwise to put the valve core of the digital cylinder in the open position;

[0039] S14: Reinstall the electrical equipment on the digital cylinder;

[0040] S15: Switch the control mode of the cylinder valve to "debugging", calibrate the zero point and full point of the cylinder valve, and complete the maintenance of the digital cylinder.

[0041] Among them, it is judged whether the cylindrical valve lifting rod has defects, and the defects include defects such as fracture of the cylindrical valve lifting rod.

[0042] Among them, the structure of the digital cylinder is as follows: a valve core is arranged inside the digital cylinder, and a square head is arranged above the valve core; an exhaust joint, an open cavity oil pipe joint, an oil return pipe joint and an oil inlet pipe joint are arranged on the side of the digital cylinder; a valve core manual operating lever is arranged on the digital cylinder, and the valve core manual operating lever is used to manually adjust the position of the valve core; a servo motor and an encoder are arranged on the digital cylinder, and the servo motor has a cable connector, and the cable connector is used to connect to the outdoor cylindrical valve control cabinet of the waterwheel, and the encoder is connected to the outdoor cylindrical valve control cabinet of the waterwheel; the servo motor is connected to the valve core, and when the servo motor rotates, the valve core can move axially; a measuring screw is connected to the bottom of the digital cylinder, and a measuring screw lead nut is sleeved on the outside of the measuring screw; the digital cylinder is installed on the relay through the digital cylinder base mounting bolts.

[0043] The digital cylinder is installed on the top of the relay, and a piston rod is arranged inside the relay. The lower end of the piston rod is used to connect with the cylindrical valve body. The cylindrical valve body is driven to move up and down by the piston rod, and the cylindrical valve is opened when the piston rod moves up.

[0044] The relay has an open cavity and a closed cavity (the upper cavity of the relay is the closed cavity, and the lower cavity is the open cavity). When hydraulic oil is introduced into the open cavity, a thrust will be generated to move the piston rod upward, and when hydraulic oil is introduced into the closed cavity, a thrust will be generated to move the piston rod downward; an open cavity pressure measuring hole and a closed cavity pressure measuring hole are provided on the side of the relay, an open cavity pressure sensor and an open cavity pressure gauge are arranged at the open cavity pressure measuring hole, and a closed cavity pressure sensor and a closed cavity pressure gauge are arranged at the closed cavity pressure measuring hole.

[0045] The open cavity of the servomotor is connected with an open cavity oil pipe, and the open cavity oil pipe is connected to the open cavity oil pipe joint on the digital cylinder.

[0046] The oil inlet pipe joint on the digital cylinder is connected to an oil inlet pipe, and a filter and an oil inlet valve are provided on the oil inlet pipe. The other end of the oil inlet pipe is connected to an oil supply ring pipe for introducing hydraulic oil into the digital cylinder, and then introducing hydraulic oil into the relay through the digital cylinder. The oil supply ring pipe is first connected to the oil inlet valve and then connected to the filter.

[0047] The return oil pipe joint on the digital cylinder is connected to the return oil pipe, and the return oil pipe is provided with an oil return valve. The other end of the return oil pipe is connected to the return oil ring pipe. The return oil in the digital cylinder flows to the return oil ring pipe through the return oil pipe, and finally returns to the cylindrical valve return oil tank outside the waterwheel room.

[0048] The servo motor drives the valve core of the digital cylinder to move, opens the oil-passing hole of the closing chamber on the digital cylinder, and closes the oil-passing hole of the opening chamber on the digital cylinder, so that the pressure oil in the digital cylinder enters the closing chamber of the servomotor, and the opening chamber of the servomotor is connected to the oil return pipe, so that the closing chamber of the servomotor passes oil to close the cylindrical valve. The servo motor drives the valve core of the digital cylinder to move, opens the oil-passing hole of the opening chamber on the digital cylinder, and closes the oil-passing hole of the closing chamber on the digital cylinder, so that the pressure oil in the digital cylinder enters the opening chamber of the servomotor, and the closing chamber of the servomotor is connected to the oil return pipe, so that the opening chamber of the servomotor passes oil to open the cylindrical valve. The servo motor adjusts its output flow and direction according to the control signal, so as to control the action of the piston rod.

[0049] As the preferred technical solution:

[0050] After the cylinder valve hydraulic system is restored to the rated pressure, the cylinder valve zero point and full point calibration are carried out to ensure that the mechanical zero point, hydraulic zero point, and electrical zero point are consistent. In this process, the full point of the cylinder valve must be calibrated first to ensure the balance of the cylinder valve, and then the zero point of the cylinder valve must be further calibrated. The cylinder valve action is based on the valve body zero point to ensure the cylinder body sealing after the cylinder valve is fully closed, to ensure that there is no water leakage in the water guide mechanism, and to prevent the unit from creeping and cavitation of the water guide mechanism due to water leakage in the water guide mechanism. During the test, relevant test data should be recorded.

[0051] As the preferred technical solution:

[0052] Step S3 specifically includes: connecting one end of a pressure measuring tube with a quick connector to an exhaust connector on the digital cylinder to release the residual pressure in the digital cylinder.

[0053] As the preferred technical solution:

[0054] Step S4 specifically includes:

[0055] Remove the encoder from the digital cylinder and remove the cable connector of the servo motor on the digital cylinder.

[0056] As the preferred technical solution:

[0057] Step S5 specifically includes:

[0058] Disassemble the oil inlet pipe, oil return pipe, open cavity oil pipe and oil pipe joints between the digital cylinder and the digital cylinder respectively.

[0059] As the preferred technical solution:

[0060] Step S7 specifically includes:

[0061] S701: A hand chain hoist is installed above the digital cylinder to lift the digital cylinder;

[0062] S702: The digital cylinder is lifted by three people working together;

[0063] One person clamps the square head above the valve core of the digital cylinder with a wrench, and one person clamps the manual operating rod of the valve core with a crank. The two people respectively control the wrench and the crank to rotate synchronously in the counterclockwise direction. The speed of rotating the manual operating rod of the valve core is three times that of rotating the square head. Another person tightens the hand chain hoist to lift the digital cylinder upward synchronously.

[0064] S703: After the digital cylinder is lifted to a height exceeding the original position of the oil pipe joint on the digital cylinder, the rotation of the wrench and the crank is stopped, and the digital cylinder is rotated in a counterclockwise direction as a whole, and the hand chain hoist is pulled synchronously to lift the digital cylinder upward;

[0065] S704: Release the connection between the digital cylinder and the measuring screw, so that the digital cylinder and the measuring screw are separated.

[0066] As the preferred technical solution:

[0067] In step S701, a hand chain hoist is hung above the digital cylinder, and the hand chain hoist and the measuring screw of the digital cylinder are placed on the same vertical line.

[0068] As the preferred technical solution:

[0069] Step S9 specifically includes:

[0070] Reinstall the digital cylinder onto the servomotor and reinstall each oil pipe joint in the reverse order and operation of steps S5 to S7, and replace the new seal during the reinstallation process.

[0071] The sealing member refers to a sealing member located between the digital cylinder and the servomotor.

[0072] As the preferred technical solution:

[0073] Step S12 specifically includes:

[0074] Connect the pressure measuring tube with quick connector to the exhaust connector on the digital cylinder to exhaust the gas in the servomotor cavity.

[0075] As the preferred technical solution:

[0076] Step S13 specifically includes:

[0077] Shake the manual operating rod of the valve core counterclockwise through the crank handle to make the valve core of the digital cylinder in the closed position, and observe the closing chamber pressure gauge at the same time. When the closing chamber pressure reaches 0.5Mpa-1Mpa, stop shaking the manual operating rod of the valve core. At this time, the closing chamber begins to exhaust. After the exhaust is completed, shake the manual operating rod of the valve core clockwise to make the valve core of the digital cylinder in the open position, so that the open chamber of the relay carries system pressure, and the closed chamber does not carry pressure.

[0078] When the valve core of the digital cylinder is in the open position, the hydraulic oil in the digital cylinder is introduced into the open chamber of the relay, so that the open chamber of the relay carries system pressure and the closed chamber does not carry pressure. The piston rod in the relay moves upward, the relay opens, and the cylindrical valve opens.

[0079] When the valve core of the digital cylinder is in the closed position, the hydraulic oil in the digital cylinder is introduced into the closing chamber of the relay, so that the open chamber of the relay is not subject to system pressure, and the closing chamber is pressurized, the piston rod in the relay moves downward, the relay is closed, and the cylindrical valve is closed.

[0080] As the preferred technical solution:

[0081] Step S14 specifically includes:

[0082] Reinstall the cable connector and encoder.

[0083] As the preferred technical solution:

[0084] The cylindrical valve servomotor digital cylinder maintenance method is used to simultaneously perform maintenance work on two symmetrical servomotor digital cylinders on the cylindrical valve, and the maintenance of the six servomotor digital cylinders is completed in three groups.

[0085] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0086] 1. The present invention realizes the maintenance of the digital cylinder of the cylindrical valve servomotor without draining the tailwater of the turbine, installing the mechanical lock of the cylindrical valve, or stopping the operation of the technical water supply system.

[0087] 2. The maintenance method of the present invention has less workload. The method does not require installation of the cylindrical valve mechanical lock spindle, does not require disassembly of the mechanical lock spindle plug, does not require turbine tailwater drainage, and does not require lowering of upstream and downstream maintenance doors.

[0088] 3. The maintenance method of the present invention has a short construction period. The method can simultaneously perform maintenance on two servomotor digital cylinders. It only takes 2 days to complete the maintenance and debugging of all servomotors, which has little impact on the operating time of the hydro-generator set.

[0089] 4. The maintenance method of the present invention requires fewer workers. Only 6 people are needed to complete the entire maintenance work. Only 3 people are needed to perform the maintenance of a single relay digital cylinder.

[0090] 5. The maintenance method of the present invention has no environmental pollution. This method does not require the complete disassembly of the pipelines on the relay digital cylinder (such as the oil inlet pipe, the oil return pipe, etc.). It only requires the disassembly of the pipeline joints on the digital cylinder. A small amount of joint oil is easy to collect and process, and will not leak to cause environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0091] Figure 1 The present invention provides a flowchart of the method for repairing the digital cylinder of a cylindrical valve servomotor.

[0092] Figure 2 The figure is a schematic diagram of the external structure of the relay digital cylinder described in the present invention.

[0093] Figure 3 It is a side view of the relay digital cylinder described in the present invention.

[0094] Figure 4 The figure is a schematic diagram of the installation of the relay described in the present invention.

[0095] Figure 5 It is a schematic diagram of the oil inlet and outlet circuits of the relay digital cylinder described in the present invention.

[0096] Figure 6 Schematic diagram of the arrangement of six relays.

[0097] Icons: 1-relay, 2-closed chamber oil circuit, 3-open chamber oil pipe, 4-return oil valve, 5-return oil pipe, 6-oil inlet valve, 7-oil inlet pipe, 8-closed chamber pressure sensor, 9-closed chamber pressure gauge, 10-open chamber pressure sensor, 11-open chamber pressure gauge, 12-digital cylinder base mounting bolts, 13-open chamber oil pipe joint, 14-servo motor, 15-cable joint, 16-encoder, 17-return oil pipe joint, 18-valve core manual operating lever, 19-oil inlet pipe joint, 20-measuring screw lead nut, 21-measuring screw, 22-exhaust joint, 23-square head, 24-open chamber pressure measuring hole, 25-closed chamber pressure measuring hole, 26-digital cylinder. DETAILED DESCRIPTION

[0098] 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 accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0099] Example 1

[0100] This embodiment proposes a method for repairing a digital cylinder of a cylindrical valve servomotor. To facilitate the description of the repair method, the structure of the digital cylinder 26 is first described. Figure 2 and Figure 3 As shown, a valve core is arranged inside the digital cylinder 26, and a square head 23 is arranged above the valve core; an exhaust joint 22, an open cavity oil pipe joint 13, an oil return pipe joint 17 and an oil inlet pipe joint 19 are arranged on the side of the digital cylinder 26; a valve core manual operating rod 18 is arranged on the digital cylinder 26, and the valve core manual operating rod 18 is used to manually adjust the position of the valve core; a servo motor 14 and an encoder 16 are arranged on the digital cylinder 26, and the servo motor 14 has a cable connector 15, and the cable connector 15 is used to connect the outdoor cylindrical valve control cabinet of the waterwheel, and the encoder 16 is connected to the outdoor cylindrical valve control cabinet of the waterwheel; the servo motor 14 is connected to the valve core, and when the servo motor 14 rotates, the valve core can move axially; a measuring screw 21 is connected to the bottom of the digital cylinder 26, and a measuring screw lead nut 20 is sleeved on the outside of the measuring screw 21; the digital cylinder 26 is installed on the relay 1 through the digital cylinder base mounting bolts 12.

[0101] like Figure 4 and Figure 5As shown, the digital cylinder 26 is installed on the top of the relay 1. A piston rod is provided inside the relay 1. The lower end of the piston rod is used to connect with the cylindrical valve body. The cylindrical valve body is driven to move up and down by the piston rod. When the piston rod moves up, the cylindrical valve is opened.

[0102] The relay 1 has an open cavity and a closed cavity ( Figure 5 In the embodiment, the upper cavity of the relay 1 is a closed cavity, and the lower cavity is an open cavity). When hydraulic oil is introduced into the open cavity, a thrust is generated to move the piston rod upward, and when hydraulic oil is introduced into the closed cavity, a thrust is generated to move the piston rod downward. An open cavity pressure measuring hole 24 and a closed cavity pressure measuring hole 25 are provided on the side of the relay 1. An open cavity pressure sensor 10 and an open cavity pressure gauge 11 are provided at the open cavity pressure measuring hole 24, and a related cavity pressure sensor 8 and a closed cavity pressure gauge 9 are provided at the closed cavity pressure measuring hole 25.

[0103] The open cavity of the servomotor 1 is connected to an open cavity oil pipe 3 , and the open cavity oil pipe 3 is connected to an open cavity oil pipe joint 13 on the digital cylinder 26 .

[0104] The oil inlet pipe joint 19 on the digital cylinder 26 is connected to the oil inlet pipe 7, and the oil inlet pipe 7 is provided with a filter and an oil inlet valve 6. The other end of the oil inlet pipe 7 is connected to the oil supply ring pipe for introducing the hydraulic oil into the digital cylinder 26, and then introducing the hydraulic oil into the relay 1 through the digital cylinder 26. The oil supply ring pipe is first connected to the oil inlet valve 6 and then connected to the filter.

[0105] The return oil pipe joint 17 on the digital cylinder 26 is connected to the return oil pipe 5, and the return oil pipe 5 is provided with an return oil valve 4. The other end of the return oil pipe 5 is connected to the return oil ring pipe. The return oil in the digital cylinder 26 flows through the return oil pipe 5 to the return oil ring pipe, and finally returns to the cylindrical valve return oil tank outside the waterwheel room.

[0106] The servo motor 14 drives the valve core of the digital cylinder 26 to move, and the closed cavity oil-passing hole on the digital cylinder 26 that is covered is opened through the valve core, and the open cavity oil-passing hole on the digital cylinder 26 is closed at the same time, so that the pressure oil in the digital cylinder 26 enters the closed cavity of the servomotor 1, and the open cavity of the servomotor 1 is connected with the oil return pipe 5, so that the closed cavity of the servomotor 1 passes oil to close the cylindrical valve. The servo motor 14 drives the valve core of the digital cylinder 26 to move, and the open cavity oil-passing hole on the digital cylinder 26 that is covered is opened through the valve core, and the closed cavity oil-passing hole on the digital cylinder 26 is closed at the same time, so that the pressure oil in the digital cylinder 26 enters the open cavity of the servomotor 1, and the closed cavity of the servomotor 1 is connected with the oil return pipe 5, so that the open cavity of the servomotor 1 passes oil to open the cylindrical valve. Figure 5The chamber closing oil circuit 2 is shown in FIG. The servo motor 14 adjusts its output flow and direction according to the control signal, thereby controlling the movement of the piston rod.

[0107] The digital cylinder 26 and the servomotor 1 are existing components, and their connection methods and inlet and outlet oil passages are also existing technologies.

[0108] like Figure 1 As shown, the method for repairing the digital cylinder of the cylindrical valve servo comprises the following steps:

[0109] S1: Control the unit to shut down and perform a single-action test on the cylinder valve servo to determine whether the cylinder valve lifting rod has defects such as breakage. If there are defects, deal with the defects accordingly. If there are no defects, open the cylinder valve to the fully open position and switch the control mode of the cylinder valve to "cut-off".

[0110] S2: Close the oil inlet valve 6 and the oil return valve 4.

[0111] S3: Connect one end of the pressure measuring tube with a quick connector to the exhaust connector 22 on the digital cylinder 26 to completely release the residual pressure in the digital cylinder 26;

[0112] S4: Remove the electrical equipment on the digital cylinder 26;

[0113] The method includes removing the encoder 16 on the digital cylinder 26 and removing the cable connector 15 of the servo motor 14 on the digital cylinder 26 .

[0114] S5: removing the oil pipe joint on the digital cylinder 26;

[0115] The method includes respectively disassembling the oil inlet pipe 7 , the oil return pipe 5 , the oil pipe joint between the open cavity oil pipe 3 and the digital cylinder 26 .

[0116] S6: Remove the mounting bolts 12 of the digital cylinder base.

[0117] S7: Disassemble the digital cylinder 26.

[0118] First, a hand chain hoist is hung above the digital cylinder 26 to lift the digital cylinder 26 .

[0119] Then three people work together to lift the digital cylinder 26: one person uses a wrench to clamp the square head 23 above the valve core, one person uses a crank to clamp the valve core manual operating rod 18, and the two people control the wrench and the crank to rotate synchronously in the counterclockwise direction. The speed of rotating the valve core manual operating rod 18 is three times that of rotating the square head 23. Another person slowly tightens the hand winch to synchronously lift the digital cylinder 26 upwards.

[0120] If the wrench gets stuck during rotation, the wrench and the crank need to be turned back slightly to eliminate the jam and then continue to rotate. Pay attention to the tightness of the guide chain of the hand winch. The guide chain can be properly tightened to stabilize the digital cylinder 26. The guide chain should not be subjected to excessive force or be loose and not subjected to force.

[0121] After the digital cylinder 26 is lifted to a height exceeding the original height of the oil pipe joint on the digital cylinder 26 (specifically, exceeding the original height of the return oil pipe joint 17), the rotation of the wrench and the crank can be stopped. At this time, the digital cylinder 26 is rotated as a whole in a counterclockwise direction, and the hand hoist is simultaneously pulled to lift the digital cylinder 26 upward.

[0122] When the digital cylinder 26 is lifted to a suitable height, the connection between the digital cylinder 26 and the measuring screw rod 21 is released, so that the digital cylinder 26 is separated from the measuring screw rod 21 .

[0123] S8: dismantle and overhaul the digital cylinder 26.

[0124] S9: After the digital cylinder 26 is overhauled, the digital cylinder 26 and each oil pipe joint are reinstalled.

[0125] The digital cylinder 26 can be reinstalled onto the servomotor 1 and each oil pipe joint can be reinstalled in the reverse order and operation of steps S5 to S7. New seals need to be replaced during the reinstallation process.

[0126] S10: The valve core manual operating rod 18 is shaken clockwise to a limit position by a crank handle, so that the valve core of the digital cylinder 26 is in an open position.

[0127] S11: Slowly open the oil return valve 4 and the oil inlet valve 6, and observe and confirm that the open-chamber pressure gauge 11 is under pressure and the closed-chamber pressure gauge 9 is not under pressure.

[0128] S12: Connect the pressure measuring tube with a quick connector to the exhaust connector 22 to exhaust the gas in the open cavity of the servomotor 1.

[0129] S13: Slowly shake the valve core manual operating rod 18 counterclockwise through the crank to put the valve core of the digital cylinder 26 in the closed position, and observe the closing chamber pressure gauge 9 at the same time. When the closing chamber pressure reaches about 1Mpa, stop shaking the valve core manual operating rod 18, and the closing chamber begins to exhaust. After the exhaust is completed, shake the valve core manual operating rod 18 clockwise again to put the valve core of the digital cylinder 26 in the open position, that is, the open chamber of the relay 1 carries system pressure, and the closed chamber carries no pressure.

[0130] S14: Reinstall the electrical equipment on the digital cylinder 26;

[0131] The method includes reinstalling the cable connector 15 and the encoder 16 .

[0132] S15: Switch the control mode of the cylinder valve to "debugging" and calibrate the zero point and full point of the cylinder valve. After the cylinder valve hydraulic system returns to the rated pressure, calibrate the zero point and full point of the cylinder valve to ensure that the mechanical zero point, hydraulic zero point, and electrical zero point are consistent. In this process, it is necessary to first calibrate the full point of the cylinder valve to ensure the balance of the cylinder valve, and then further calibrate the zero point of the cylinder valve. The cylinder valve action is based on the zero point of the valve body to ensure the sealing of the cylinder body after the cylinder valve is fully closed, to ensure that there is no water leakage in the water guide mechanism, and to prevent the unit from creeping and cavitation of the water guide mechanism due to water leakage in the water guide mechanism. Keep a good record of relevant test data during the test.

[0133] The above steps are only the maintenance process of a single relay digital cylinder. In fact, the maintenance work of the two symmetrical relay digital cylinders on the cylindrical valve can be carried out at the same time. The six relay digital cylinders are divided into three groups for maintenance. After the maintenance of the six relay digital cylinders is completed, the control mode of the cylindrical valve is switched to "debugging", and the zero point and full point calibration of the digital cylinder debugging is carried out in the control system.

[0134] The working principle of the present invention is as follows:

[0135] After the unit is shut down, fully open the cylinder valve, switch the cylinder valve control mode to the "cut-off" position, use the unrepaired servomotor 1 to lift the cylinder valve body, and then carry out the servomotor digital cylinder maintenance work. The repaired servomotor 1 opens the chamber to continue pressurizing, and the function of lifting the cylinder valve body can be restored. Figure 6 As shown, the cylindrical valve has six servomotors 1, which are evenly arranged in the circumference of the cylindrical valve. This method can be used to simultaneously perform maintenance work on two symmetrically positioned servomotor digital cylinders. It is only necessary to close the oil inlet valve 6 on the oil inlet pipe 7 connected to the servomotor digital cylinder to be maintained and the oil return valve 4 on the oil return pipe 5 connected to the servomotor digital cylinder to perform maintenance. After a group of servomotor digital cylinders are overhauled, manually shake the valve core manual operating lever 18 to put the overhauled servomotor digital cylinder in the open cavity position, that is, the servomotor 1 has system pressure in the open cavity and no pressure in the closed cavity. At this time, the next group of servomotor digital cylinders can be overhauled. Perform three overhauls in sequence, each time simultaneously overhauling two servomotor digital cylinders, and the six servomotor digital cylinders can be overhauled in three times.

[0136] After the six servomotor digital cylinders are overhauled, the valve cores of all servomotor digital cylinders are adjusted to the open cavity position by manually shaking the valve core manual operating lever 18, so that the open cavity of servomotor 1 carries system pressure and the closed cavity carries no pressure.

[0137] The maintenance method proposed in this embodiment does not need to install a cylindrical valve mechanical lock, so there is no need to drain the unit, there is no need to completely remove the relay oil inlet pipe 7, the oil return pipe 5, etc., and two relay digital cylinders can be repaired at the same time.

[0138] 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 method for repairing a digital cylinder of a cylindrical valve servo. Features: The structure of the digital cylinder is as follows: a valve core is arranged inside the digital cylinder, and a square head is arranged above the valve core; an exhaust joint, an open-cavity oil pipe joint, an oil return pipe joint and an oil inlet pipe joint are arranged on the side of the digital cylinder; a valve core manual operating lever is arranged on the digital cylinder, and the valve core manual operating lever is used to manually adjust the position of the valve core; a servo motor and an encoder are arranged on the digital cylinder, and the servo motor has a cable connector, and the cable connector is used to connect to the outdoor cylindrical valve control cabinet of the waterwheel, and the encoder is connected to the outdoor cylindrical valve control cabinet of the waterwheel; the servo motor is connected to the valve core, and when the servo motor rotates, the valve core can move axially; a measuring screw is connected to the bottom of the digital cylinder, and a measuring screw lead nut is sleeved on the outside of the measuring screw; the digital cylinder is installed on the relay through the digital cylinder base mounting bolts; The digital cylinder is installed on the top of the servomotor. A piston rod is provided inside the servomotor. The lower end of the piston rod is used to connect with the cylindrical valve body. The cylindrical valve body is driven to move up and down by the piston rod. When the piston rod moves up, the cylindrical valve is opened. The servomotor has an open cavity and a closed cavity. When hydraulic oil is introduced into the open cavity, the piston rod moves upward, and when hydraulic oil is introduced into the closed cavity, the piston rod moves downward. The servomotor is provided with an open cavity pressure measuring hole and a closed cavity pressure measuring hole on the side thereof. An open cavity pressure sensor and an open cavity pressure gauge are provided at the open cavity pressure measuring hole, and a closed cavity pressure sensor and a closed cavity pressure gauge are provided at the closed cavity pressure measuring hole. The open cavity of the servomotor is connected to an open cavity oil pipe, and the open cavity oil pipe is connected to an open cavity oil pipe joint on the digital cylinder; The oil inlet pipe joint on the digital cylinder is connected to an oil inlet pipe, and a filter and an oil inlet valve are arranged on the oil inlet pipe. The other end of the oil inlet pipe is connected to an oil supply ring pipe for introducing hydraulic oil into the digital cylinder, and then introducing hydraulic oil into the servomotor through the digital cylinder. The oil supply ring pipe is first connected to the oil inlet valve and then to the filter. The oil return pipe joint on the digital cylinder is connected to an oil return pipe, an oil return valve is provided on the oil return pipe, the other end of the oil return pipe is connected to an oil return ring pipe, and the return oil in the digital cylinder flows through the oil return pipe to the oil return ring pipe and finally returns to the cylindrical valve oil return tank outside the waterwheel room; The servo motor drives the valve core of the digital cylinder to move, opens the oil-passing hole of the closing chamber on the digital cylinder, and closes the oil-passing hole of the opening chamber on the digital cylinder, so that the pressure oil in the digital cylinder enters the closing chamber of the servomotor, and the opening chamber of the servomotor is connected with the oil return pipe, so that the closing chamber of the servomotor passes oil to close the cylindrical valve; The servo motor drives the valve core of the digital cylinder to move, opens the oil-passing hole of the opening chamber on the digital cylinder, and closes the oil-passing hole of the closing chamber on the digital cylinder, so that the pressure oil in the digital cylinder enters the opening chamber of the servomotor, and the closing chamber of the servomotor is connected with the oil return pipe, so that the opening chamber of the servomotor passes oil to open the cylindrical valve; The method uses an unmaintained servomotor to lift the cylindrical valve body; The method comprises the following steps: S1: Control the unit to stop, perform a single-action test on the cylindrical valve servomotor, and determine whether the cylindrical valve lifting rod has defects. If there are defects, deal with the defects first; if there are no defects, open the cylindrical valve to the full open position, and switch the control mode of the cylindrical valve to "cut off". The digital cylinder of the servomotor to be repaired is the first digital cylinder; S2: closing the oil inlet valve on the oil inlet pipe connected to the first digital cylinder and the oil return valve on the oil return pipe connected to the first digital cylinder; S3: Releasing the residual pressure in the first digital cylinder; S4: removing the electrical equipment on the first digital cylinder; S5: removing the oil pipe joint on the first digital cylinder; S6: removing the mounting bolts of the first digital cylinder base; S7: disassembling the first digital cylinder; S8: dismantling and repairing the first digital cylinder; S9: After the first digital cylinder is overhauled, the first digital cylinder and each oil pipe joint are reinstalled; S10: Shake the valve core manual operating rod clockwise to place the valve core of the first digital cylinder in an open position; S11: Open the oil return valve and the oil inlet valve, and observe and confirm that the open-cavity pressure gauge at the open-cavity pressure measuring hole of the servomotor is under pressure, and the closed-cavity pressure gauge at the closed-cavity pressure measuring hole of the servomotor is not under pressure; S12: Open the cavity of the relay to exhaust air; S13: Shake the valve core manual operating rod counterclockwise to put the valve core of the first digital cylinder in the closed position, and exhaust the servomotor cavity. After the exhaust is completed, shake the valve core manual operating rod clockwise to put the valve core of the first digital cylinder in the open position; S14: Reinstall the electrical equipment on the first digital cylinder; S15: Switch the control mode of the cylindrical valve to "debugging", calibrate the zero point and full point of the cylindrical valve, and complete the maintenance of the first digital cylinder.

2. The method for repairing a digital cylinder of a cylindrical valve servo according to claim 1 is characterized in that: Step S3 specifically includes: connecting one end of a pressure measuring tube with a quick connector to an exhaust connector on the first digital cylinder to relieve the residual pressure in the first digital cylinder.

3. The method for repairing a digital cylinder of a cylindrical valve servo according to claim 1, characterized in that: Step S4 specifically includes: Remove the encoder on the first digital cylinder, and remove the cable connector of the servo motor on the first digital cylinder.

4. The method for repairing a digital cylinder of a cylindrical valve servo according to claim 1, characterized in that: Step S5 specifically includes: The oil inlet pipe, the oil return pipe, the open cavity oil pipe connected to the first digital cylinder and the oil pipe joints between the first digital cylinder are respectively disassembled.

5. The method for repairing a digital cylinder of a cylindrical valve servo according to claim 1, characterized in that: Step S7 specifically includes: S701: Hanging a hand chain hoist above the first digital cylinder to lift the first digital cylinder; S702: lifting the first digital cylinder through collaborative work of three persons; One person clamps the square head above the valve core of the first digital cylinder with a wrench, and one person clamps the manual operating rod of the valve core with a crank. The two people respectively control the wrench and the crank to rotate synchronously in the counterclockwise direction. The speed of rotating the manual operating rod of the valve core is three times that of rotating the square head. Another person tightens the hand chain hoist to synchronously lift the first digital cylinder upwards. S703: After the first digital cylinder is lifted to a height exceeding the original position of the oil pipe joint on the first digital cylinder, the rotation of the wrench and the crank is stopped, and the first digital cylinder is rotated in a counterclockwise direction as a whole, and the hand chain hoist is pulled synchronously to lift the first digital cylinder upward; S704: Release the connection between the first digital cylinder and the measuring screw rod, so that the first digital cylinder is separated from the measuring screw rod.

6. The method for repairing a digital cylinder of a cylindrical valve servo according to claim 1 or 5, characterized in that: Step S9 specifically includes: According to the steps in reverse order and operation to step S5 to step S7, the first digital cylinder is reinstalled on the relay and each oil pipe joint is reinstalled, and a new seal is replaced during the reinstallation process.

7. The method for repairing a digital cylinder of a cylindrical valve servo according to claim 1, characterized in that: Step S12 specifically includes: Connect the pressure measuring tube with a quick connector to the exhaust connector on the first digital cylinder to exhaust the gas in the servomotor cavity.

8. The method for repairing a digital cylinder of a cylindrical valve servo according to claim 1, characterized in that: Step S13 specifically includes: Shake the manual operating rod of the valve core counterclockwise through the crank handle to make the valve core of the first digital cylinder in the closed position, and observe the closed chamber pressure gauge at the same time. When the closed chamber pressure reaches 0.5Mpa-1Mpa, stop shaking the manual operating rod of the valve core, and the closed chamber begins to exhaust. After the exhaust is completed, shake the manual operating rod of the valve core clockwise again to make the valve core of the first digital cylinder in the open position, so that the open chamber of the relay carries system pressure, and the closed chamber does not carry pressure.

9. The method for repairing a digital cylinder of a cylindrical valve servomotor according to claim 1, characterized in that: Step S14 specifically includes: Reinstall the cable connector and encoder.

10. The method for repairing a digital cylinder of a cylindrical valve servo according to claim 1, characterized in that: The cylindrical valve servomotor digital cylinder maintenance method is used to simultaneously perform maintenance work on two symmetrical servomotor digital cylinders on the cylindrical valve, and the maintenance of the six servomotor digital cylinders is completed in three groups.

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