Method for replacing piston seal of servomotor of hydraulic hoist

Abstract

The invention relates to the field of servomotor equipment, in particular to a method for replacing a hydraulic hoist servomotor piston seal, which comprises the following steps of: separating a servomotor piston rod from a gate on a dam body, and withdrawing the piston rod to the highest position by utilizing a hydraulic system; hydraulic oil in the servomotor is discharged, and a lifting appliance is installed so that a piston rod of the servomotor can move downwards subsequently; a servomotor piston rod is lowered, and a servomotor lower end cover is dismantled; and sealing and replacing the piston of the servomotor, and inspecting the replaced piston of the servomotor. According to the method for replacing the piston seal of the hydraulic hoist servomotor, the piston of the servomotor is convenient to replace, and time and labor cost are reduced.

Description

Technical Field

[0001] The invention relates to the field of servomotor equipment, and in particular to a method for replacing a piston seal of a servomotor of a hydraulic hoist. Background Art

[0002] The hydraulic gate hoist of a hydropower station is a gate hoist that uses liquid as a force transmission medium to push the boom to pull the gate leaf. The hydraulic gate hoist is mainly composed of an electrical control system, a hydraulic transmission system, etc., and works together through hydraulic pipes, hydraulic servomotors, hydraulic pump stations, electrical detection, etc. The hydraulic gate hoist servomotor is a key component of the hydraulic gate hoist. The servomotor is usually used to control the movement of the gate hoist to ensure that the gate hoist can be opened or closed smoothly and accurately.

[0003] Due to high-frequency operation and aging, the seals of the relay pistons of the hydraulic gate hoist of the hydropower station often wear or get damaged, causing the gate to slide down excessively, affecting the normal operation of the gate, and even affecting the safe and stable operation of the hydropower station in severe cases.

[0004] At present, the method for replacing the piston seal of the hydraulic gate hoist servo installed on the gate of large hydropower stations is to remove the servo as a whole from the hydraulic system, then hoist it out of the gate area, then place the servo horizontally, disassemble it, and replace the piston seal. Then hoist the servo above the gate, and then tilt the servo to install it on the hydraulic system, which is time-consuming and labor-intensive, with high maintenance time and labor costs. Summary of the invention

[0005] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, an embodiment of the present invention provides a method for replacing a hydraulic hoist servo piston seal, which facilitates the replacement of the servo piston and reduces time and labor costs.

[0006] The method for replacing the piston seal of the hydraulic gate hoist servo according to the embodiment of the present invention is characterized in that it includes: disengaging the servo piston rod from the gate on the dam body, and retracting the piston rod to the highest position by using the hydraulic system; discharging the hydraulic oil in the servo, and installing a lifting device to facilitate the subsequent downward movement of the servo piston rod; lowering the servo piston rod and removing the servo lower end cover; replacing the servo piston seal, and inspecting the replaced servo piston.

[0007] The method for replacing the hydraulic hoist servo piston seal according to the embodiment of the present invention facilitates the replacement of the servo piston and reduces time and labor costs.

[0008] In some embodiments, when the servomotor piston rod is separated from the gate on the dam body and the piston rod is retracted to the highest position by using the hydraulic system, the following steps are included:

[0009] Close the gate, disengage the piston rod lifting head shaft pin from the gate lifting ear, set multiple first ground anchors on the dam body near the hydraulic system to install the first hand-pull component, the first hand-pull component is connected to the relay piston rod; put the relay to a vertical position through the first hand-pull component, use the hydraulic system to retract the relay piston rod to the extreme position, and close the relay lower chamber valve.

[0010] In some embodiments, a buffer pad is provided on the dam body, and the buffer pad corresponds to a position of the dam body corresponding to a swinging direction of the servomotor piston rod in the vertical position of the servomotor.

[0011] In some embodiments, when the hydraulic oil in the servomotor is discharged and the sling is installed so that the piston rod of the servomotor can be moved downward, the following steps are included:

[0012] Open the valve of the upper chamber of the servomotor to release the oil in the upper chamber, make sure that the pressure in the upper chamber of the servomotor has been relieved, and remove the upper end cover of the upper servomotor;

[0013] A second ground anchor and a second hand-pulling component connected to the second ground anchor are arranged on the dam body near the hydraulic system, and the second hand-pulling component is hoisted with the servomotor through a hoisting ring;

[0014] Remove the first hand pull member.

[0015] In some embodiments, when lowering the relay piston rod and removing the lower end cover of the relay, the following steps are included: opening the connecting valve between the upper and lower chambers of the relay, and using a second hand-pull component to lower the relay piston rod; after the top of the piston rod contacts the lower end cover, the piston rod is moved up 8mm to 15mm by the second hand-pull component, and a pier is set at the bottom of the piston rod to support the relay, a hanging basket is set at the lower end cover of the relay, and the lower end cover of the relay is removed.

[0016] In some embodiments, the servomotor piston is replaced, and the replaced servomotor piston is inspected.

[0017] In some embodiments, when the valve of the upper chamber of the servomotor is opened to release the oil in the upper chamber, the oil in the upper chamber of the servomotor is pumped into the oil tank using an oil pumping device.

[0018] In some embodiments, the first hand-pulling member and the second hand-pulling member are any one of a lever hoist, a chain hoist or a manual winch.

[0019] In some embodiments, before the servomotor piston rod is disengaged from the gate on the dam body, the dam body valve is adjusted to a fully closed position.

[0020] In some embodiments, when removing the upper end cover of the upper relay, a scaffolding is set up to remove the upper end cover of the relay. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the second hand-pull component according to an embodiment of the present invention.

[0022] Figure 2 It is a schematic diagram of a dam body and a gate in a method for replacing a piston seal of a hydraulic hoist servo according to an embodiment of the present invention.

[0023] Figure 3 Schematic diagram of a second ground anchor according to an embodiment of the present invention.

[0024] Figure 4 Schematic diagram of a first ground anchor according to an embodiment of the present invention.

[0025] Figure 5 It is a schematic diagram of the first hand-pull component according to an embodiment of the present invention.

[0026] Figure 6 The present invention is a flowchart of a method for replacing a piston seal of a hydraulic hoist servo according to an embodiment of the present invention.

[0027] Reference numerals:

[0028] The first hand-pull component 1, the second hand-pull component 2,

[0029] Dam body 3, gate 4, relay 5, piston rod 51, upper end cover 52, lower end cover 53,

[0030] Buffer pad 6, first ground anchor 7, second ground anchor 8, hydraulic system 9. DETAILED DESCRIPTION

[0031] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0032] refer to Figures 1 to 6 A method for replacing a piston seal of a hydraulic gate hoist servo according to an embodiment of the present invention is described. The method for replacing a piston seal of a hydraulic gate hoist servo according to an embodiment of the present invention comprises: s100: disengaging a piston rod 51 of a servo 5 from a gate 4 on a dam body 3, and retracting the piston rod 51 to the highest position by using a hydraulic system 9; s200: discharging the hydraulic oil in the servo 5, and installing a sling to facilitate subsequent downward movement of the piston rod 51 of the servo 5; s300: lowering the piston rod 51 of the servo 5, and removing the lower end cover 53 of the servo 5; s400: replacing the piston seal of the servo 5, and inspecting the replaced piston of the servo 5.

[0033] The method for replacing the piston seal of the hydraulic hoist servo 5 according to the embodiment of the present invention facilitates the replacement of the servo 5 piston and reduces time and labor costs.

[0034] Specifically, Figures 1 to 6As shown, the gate 4 of the hydropower station is now closed to prevent the piston rod 51 of the relay 5 from being separated from the gate 4 on the dam body 3. The gate 4 is subjected to too little force in the up and down directions, causing the gate 4 to fall. After the piston rod 51 of the relay 5 is separated from the gate 4 on the dam body 3, the piston rod 51 is retracted to the highest position through the existing hydraulic system 9 installed on the dam body 3, that is, the piston rod 51 is extended and retracted in the up and down directions. The highest position can be understood as the highest position of the piston rod 51 moving upward, and the up and down direction is the gravity direction.

[0035] The hydraulic oil in the relay 5 is discharged, and a lifting device is installed so that the piston rod 51 of the relay 5 can be moved downward. At the same time, the lifting device is installed, and the lifting device is connected to the piston rod 51 so that when the piston rod 51 moves downward later, the piston rod 51 is slowly lowered. At the same time, the upper end cover 52 of the relay 5 is removed so that the oil in the upper cavity of the relay 5 can be discharged later.

[0036] Then, the piston rod 51 of the servomotor 5 is lowered by the lifting device, and the lower end cover 53 of the servomotor 5 is removed.

[0037] Replace the piston of the servo 5, and perform a pressure test on the servo 5 after replacing the piston. For example, after the piston replacement work is completed, reinstall the piston rod 51, and perform a pressure test on the servo 5 at 1.25 times the rated working pressure, requiring no leakage.

[0038] The method for replacing the piston seal of the hydraulic gate hoist servomotor 5 in the embodiment of the present invention does not require the servomotor 5 to be disassembled from the hydraulic system 9 on the dam body 3 and hoisted separately to the maintenance site for replacing the piston. The piston can be replaced above the gate 4 without placing the servomotor 5 horizontally, thus saving manpower and material resources and reducing maintenance time and labor costs.

[0039] In some embodiments, when the piston rod 51 of the servomotor 5 is separated from the gate 4 on the dam body 3 and the piston rod 51 is retracted to the highest position by the hydraulic system 9, the following steps are included:

[0040] Close the gate 4, disengage the piston rod 51 lifting head axle pin from the gate 4 lifting ear, set a plurality of first ground anchors 7 on the dam body 3 near the hydraulic system 9 to install the first hand-pull component 1, and the first hand-pull component 1 is connected to the piston rod 51 of the relay 5; put the relay 5 in a vertical position through the first hand-pull component 1, retract the piston rod 51 of the relay 5 to the extreme position by using the hydraulic system 9, and close the lower chamber valve of the relay 5.

[0041] Specifically, Figures 1 to 6As shown, a plurality of first ground anchors 7 are arranged above the hydraulic system 9 or at the same height to install the first hand-pull component 1, and the first hand-pull component 1 is connected to the piston rod 51 of the relay 5 below to prevent the piston rod 51 from leaking and sliding down. The hanging head shaft pin below the piston rod 51 is separated from the lifting ear of the gate 4, and the piston rod 51 of the relay 5 that has not been separated from the gate 4 has a certain inclination angle with the up-down direction. When the hanging head shaft pin below the piston rod 51 is separated from the lifting ear of the gate 4, the piston rod 51 of the relay 5 is slowly placed in a state parallel to the up-down direction through the first hand-pull component 1, that is, the relay 5 is placed in a vertical position, which is convenient for the subsequent fixing of the relay 5 and avoids the relay 5 from swinging sharply in the left-right direction after being separated from the gate 4, causing the piston rod 51 to impact the side wall of the dam body 3.

[0042] The hydraulic system 9 on the dam body 3 is used to lift the piston rod 51 of the relay 5 to reduce the size of the relay 5 in the vertical direction to prevent the relay 5 from swinging and impacting the side wall of the dam body 3. It should be noted that when the relay 5 is not separated from the gate 4, the first hand-pulling component 1 is connected to the piston rod 51 of the relay 5 to facilitate the subsequent vertical placement of the relay 5. The hydraulic system 9 is used to retract the piston rod 51 of the relay 5 to the extreme position, and the valve of the lower chamber of the relay 5 is closed to facilitate the subsequent discharge of the oil in the relay 5.

[0043] The method for replacing the piston seal of the hydraulic gate hoist servomotor 5 of the embodiment of the present invention is to facilitate the limiting and guiding of the piston rod 51 of the servomotor 5 separated from the gate 4 by setting the first ground anchor 7 and the plurality of first hand-pull components 1, so as to prevent the piston rod 51 of the servomotor 5 from swinging in the left and right directions and impacting the side wall of the dam body 3, thereby improving the safety and stability of the maintenance of the piston rod 51 of the servomotor 5. In addition, there is no need to disassemble the servomotor 5 from the hydraulic system 9 on the dam body 3 and hoist it separately to the maintenance site for replacing the piston. The piston can be replaced above the gate 4, and there is no need to place the servomotor 5 horizontally, which saves manpower and material resources, and reduces maintenance time and labor costs.

[0044] Furthermore, a buffer pad 6 is provided on the dam body 3, and the buffer pad 6 corresponds to the position of the dam body 3 corresponding to the swing direction of the piston rod 51 of the relay 5 in the vertical position of the relay 5. When the hydropower station is installed, the relay 5 can swing in the left and right directions so as to open and close the gate 4 by the extension and contraction of the relay 5, and then when the gate 4 and the relay 5 are separated, the relay 5 will swing in the left and right directions. By providing the buffer pad 6, the buffer pad 6 extends in the up and down directions to prevent the relay 5 from directly impacting the dam body 3 after the relay 5 is separated from the gate 4, causing damage to the relay 5.

[0045] In some embodiments, when the hydraulic oil in the servomotor 5 is discharged and the sling is installed so that the piston rod 51 of the servomotor 5 can be moved downward, the following steps are included:

[0046] Open the valve of the upper chamber of the servomotor 5 to release the oil in the upper chamber, make sure that the pressure in the upper chamber of the servomotor 5 has been relieved, and remove the upper end cover 52 of the upper servomotor 5;

[0047] A second ground anchor 8 and a second hand-pull component 2 connected to the second ground anchor 8 are arranged on the dam body 3 near the hydraulic system 9. The second hand-pull component 2 is hoisted with the servomotor 5 through a hoisting ring; and the first hand-pull component 1 is removed.

[0048] Specifically, Figures 1 to 6 As shown, when the piston rod 51 of the servomotor 5 is retracted upward to the limit position, that is, the piston rod 51 is retracted to the highest position in the up-down direction, the upper chamber valve of the servomotor 5 is opened to release the oil in the upper chamber, for example, a special hose is used to connect the upper chamber oil pipe to the oil return tank.

[0049] Then, the upper end cover 52 of the relay 5 is removed so that one of the plurality of second hand-pull parts 2 is connected to the upper end of the relay 5 so as to facilitate the subsequent downward movement of the relay 5. The second hand-pull part 2 is arranged directly above the relay 5. Compared with the first hand-pull part 1 connected to the side wall of the dam body 3 and connected to the piston rod 51 of the relay 5 at the lower end, the second hand-pull part 2 is directly connected to the upper end of the relay 5 so as to facilitate the upward and downward movement of the relay 5. By setting the second hand-pull part 2, the relay 5 can be moved more smoothly in the upward and downward directions, and the upward and downward movement of the second hand-pull part 2 can be made smoother and more stable.

[0050] In some embodiments, when lowering the piston rod 51 of the relay 5 and removing the lower end cover 53 of the relay 5, the following steps are included: opening the connecting valve between the upper and lower chambers of the relay 5, and using the second hand-pull component 2 to lower the piston rod 51 of the relay 5; after the top of the piston rod 51 contacts the lower end cover 53, the piston rod 51 is moved up 8mm to 15mm through the second hand-pull component 2, and a pier is set at the bottom of the piston rod 51 to support the relay 5, a hanging basket is set at the lower end cover 53 of the relay 5, and the lower end cover 53 of the relay 5 is removed.

[0051] Specifically, Figures 1 to 6 As shown, the second hand-pull component 2 is connected to a plurality of second ground anchors 8 at the top, and is connected to the piston rod 51 of the servomotor 5 at the bottom to facilitate the subsequent downward movement of the piston rod 51, that is, the downward movement of the servomotor 5.

[0052] Open the upper and lower chamber connecting valves of the relay 5, and use the second hand-pull component 2 to lower the piston rod 51 of the relay 5. When the top of the piston rod 51 of the relay 5 contacts the lower end cover 53 of the relay 5, the second hand-pull component 2 moves the piston rod 51 of the relay 5 up by 8mm to 15mm to prevent the piston rod 51 of the relay 5 from contacting the ground and causing the piston rod 51 to shake when the piston is replaced. A buttress is set at the bottom of the piston rod 51 to support the relay 5, and a hanging basket is set to manually remove the lower end cover 53 of the relay 5 to replace the piston.

[0053] The method for replacing the piston seal of the hydraulic gate opening and closing machine servomotor 5 in the embodiment of the present invention facilitates the movement of the servomotor 5 in the up and down directions by setting the second hand-pull component 2, and then facilitates the movement of the piston rod 51 in the up and down directions, so as to fix the piston rod 51 to a certain extent. At the same time, a pier is provided to cooperate with the second hand-pull component 2. Under the cooperation of the gravity of the servomotor 5, the supporting force of the pier and the pulling force provided by the second hand-pull component 2, a certain degree of fixation is achieved, which facilitates the replacement of the piston.

[0054] Further, after replacing the piston of the servomotor 5, the piston of the replaced servomotor 5 is inspected, for example, the piston rod 51 is reinstalled, and the servomotor 5 is subjected to a pressure test of 1.25 times the rated working pressure, requiring no hydraulic oil leakage. First, ensure that the piston rod 51, the piston and the relevant parts inside the servomotor 5 are thoroughly cleaned and free of impurities, rust or damage. Apply a proper amount of lubricating oil on the contact surface of the piston rod 51 and the piston to reduce friction and wear. According to the guide or drawings provided by the manufacturer, correctly install the piston rod 51 on the piston and ensure that all connecting parts are tightened in place. If necessary, adjust the position or angle of the piston rod 51 to ensure that it moves smoothly and meets the design requirements. Ensure that the servomotor 5 is properly installed and connected to the hydraulic system 9, and all valves and pipelines are in the closed state. Use a hydraulic pump or other suitable equipment to slowly pressurize the servomotor 5 until it reaches 1.25 times its rated working pressure. During the pressurization process and after reaching the target pressure, carefully observe whether there is hydraulic oil leakage in the servomotor 5 and its connecting parts. At the same time, check whether the housing, connectors, etc. of the servomotor 5 are abnormally deformed or damaged. During the pressurization process and after reaching the target pressure, carefully observe whether there is hydraulic oil leakage in the servomotor 5 and its connecting parts. At the same time, check whether the housing, connectors, etc. of the servomotor 5 are abnormally deformed or damaged. After completing the pressure test, slowly release the pressure and check again whether the servomotor 5 and its related parts are damaged or leaking.

[0055] Furthermore, when the valve of the upper chamber of the servomotor 5 is opened to release the oil in the upper chamber, the oil in the upper chamber of the servomotor 5 is pumped to the oil tank using the pumping equipment, thereby increasing the speed of oil extraction, reducing the time for repairing and replacing the piston, and improving maintenance efficiency.

[0056] Furthermore, the first hand-pulled component 1 and the second hand-pulled component 2 are any one of a lever block, a hand chain block or a manual winch. The first hand-pulled component 1 and the second hand-pulled component 2 can also cooperate with a wire rope or a lifting ring to connect and hoist the piston rod 51 or the relay 5.

[0057] Furthermore, before the piston rod 51 of the servomotor 5 is separated from the gate 4 on the dam body 3, the valve of the dam body 3 is adjusted to the fully closed position. When the piston rod 51 of the servomotor 5 is separated from the gate 4 on the dam body 3, if the gate 4 is not in the fully closed state, the gate 4 has a downward movement tendency, which causes the gate 4 to move downward after being separated from the piston rod 51 of the servomotor 5, causing the gate 4 to impact the dam body 3.

[0058] Further, when removing the upper end cover 52 of the upper relay 5, a scaffold is set up to remove the upper end cover 52 of the relay 5. The difficulty of personnel removing the upper end cover 52 on the relay 5 is reduced. In the description of the present invention, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0059] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0060] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0062] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0063] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A method for replacing a hydraulic hoist servo piston seal, characterized in that: include: Disconnect the piston rod of the relay from the gate on the dam body, and use the hydraulic system to retract the piston rod to the highest position; Drain the hydraulic oil in the servomotor and install the lifting device to facilitate the subsequent downward movement of the servomotor piston rod; Lower the piston rod of the servomotor and remove the lower end cover of the servomotor; The servo piston seal is replaced and the replaced servo piston is inspected.

2. The method for replacing the piston seal of the hydraulic hoist servo according to claim 1 is characterized in that: When the piston rod of the relay is separated from the gate on the dam body and the piston rod is retracted to the highest position by using the hydraulic system, the following steps are included: Close the gate, disengage the piston rod lifting head shaft pin from the gate lifting ear, set multiple first ground anchors on the dam body near the hydraulic system to install the first hand-pull component, the first hand-pull component is connected to the relay piston rod; put the relay to a vertical position through the first hand-pull component, use the hydraulic system to retract the relay piston rod to the extreme position, and close the relay lower chamber valve.

3. The method for replacing the piston seal of the hydraulic hoist servo according to claim 2 is characterized in that: A buffer pad is arranged on the dam body, and the buffer pad corresponds to a position of the dam body corresponding to a swing direction of the servomotor piston rod at the vertical position of the servomotor.

4. The method for replacing the piston seal of the hydraulic hoist servo according to claim 2, characterized in that: When the hydraulic oil in the servomotor is discharged and the sling is installed so that the piston rod of the servomotor can be moved downward, the following steps are included: Open the valve of the upper chamber of the servomotor to release the oil in the upper chamber, make sure that the pressure in the upper chamber of the servomotor has been relieved, and remove the upper end cover of the upper servomotor; A second ground anchor and a second hand-pull component connected to the second ground anchor are arranged on the dam body near the hydraulic system. The second hand-pull component is hoisted with a servomotor through a hoisting ring. The first hand-pull component is removed.

5. The method for replacing the piston seal of the hydraulic hoist servo according to claim 2, characterized in that: The following steps are included when lowering the servomotor piston rod and removing the servomotor lower end cover: Open the connecting valve between the upper and lower chambers of the servomotor, and use the second hand-pull component to lower the piston rod of the servomotor; After the top of the piston rod contacts the lower end cover, the piston rod is moved up 8mm to 15mm through the second hand-pull component, and a pier is set at the bottom of the piston rod to support the relay, a hanging basket is set at the lower end cover of the relay, and the lower end cover of the relay is removed.

6. The method for replacing the piston seal of the hydraulic hoist servo according to claim 5, characterized in that: Replace the relay piston and inspect the replaced relay piston.

7. The method for replacing the piston seal of the hydraulic hoist servo according to claim 6, characterized in that: When the valve of the upper chamber of the servomotor is opened to release the oil in the upper chamber, the oil in the upper chamber of the servomotor is pumped into the oil tank using the pumping equipment.

8. The method for replacing the piston seal of the hydraulic hoist servo according to claim 2, characterized in that: The first hand-pulled component and the second hand-pulled component are any one of a lever block, a chain block or a manual winch.

9. The method for replacing the piston seal of the hydraulic hoist servo according to claim 5, characterized in that: Before disengaging the servomotor piston rod from the gate on the dam body, adjust the dam body valve to the fully closed position.

10. The method for replacing the piston seal of the hydraulic hoist servo according to claim 2, characterized in that: When removing the upper end cover of the upper relay, a scaffolding is set up to remove the upper end cover of the relay.

Images