Method for disassembling and assembling knuckle bearing of large-size hydraulic cylinder

Abstract

The invention provides a large-size hydraulic cylinder knuckle bearing dismounting and mounting method which comprises the following steps: mounting a temporary operation platform for dismounting a pin shaft of a hinged support bearing, hoisting a constructor to a coupling shaft of a hydraulic cylinder by using a vehicle-mounted hanging basket, dismounting the coupling shaft by using a coupling shaft dismounting tool, and hoisting the hydraulic cylinder. The hinged support is located above the temporary operation platform, and a constructor of the temporary operation platform removes a pin shaft of a hinged support bearing; the hydraulic cylinder is lifted to a designated position, and the knuckle bearing is dismantled through a bearing dismantling tool; and checking the dismounted pin shaft and the knuckle bearing, judging the jam reason, and maintaining or replacing. According to the invention, the processing time of the jam problem of the knuckle bearing of the large-size hydraulic cylinder can be shortened, the working efficiency is improved, the personal safety of operators is guaranteed, the risk and maintenance cost of long-distance transportation are reduced, the reliability of a gate system is improved, and powerful guarantee is provided for flood control and flood control tasks of a hydropower station.

Description

Technical Field

[0001] The invention relates to the technical field of disassembly and assembly of hydraulic cylinders in hydropower stations, and in particular to a disassembly and assembly method of a large-size hydraulic cylinder spherical bearing. Background Art

[0002] The large-size hydraulic cylinder spherical bearings of hydropower stations are precision equipment. For a long time, installation and removal have required certain environmental requirements and tooling requirements, especially for hydraulic cylinders that have been in operation for many years. Because they are affected by many aspects and lack unique disassembly and assembly tools and skilled personnel, on-site disassembly and installation are limited. As a result, the disassembly and assembly of spherical bearings can only be transported to professional manufacturers, which increases economic costs and the time required to deal with defects. Due to force majeure during transportation, transportation time and transportation risks are increased, reducing the reliability of the power station gate system.

[0003] For example, in the past, when hydropower stations were dealing with the problem of jamming of hydraulic cylinder joint bearings in the surface or bottom holes of the dam top, they had to use mobile truck cranes (200T and above) for lifting operations. The hydraulic cylinders and joint bearings had to be dismantled and then transported to professional manufacturers for operations. After being processed by the professional manufacturers, they were transported back to the hydropower station for installation, which was both time-consuming and labor-intensive. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art to at least some extent. To this end, an embodiment of the present invention provides a method for disassembling and assembling a large-size hydraulic cylinder joint bearing, which greatly shortens the processing time of the large-size hydraulic cylinder joint bearing jamming problem and saves maintenance costs.

[0005] The embodiment of the present invention provides a method for disassembling and assembling a large-size hydraulic cylinder joint bearing, comprising the following steps:

[0006] S1, install a temporary working platform for removing the pin shaft of the support hinge seat bearing, and install a ladder at the connection between the temporary working platform and the original walking platform;

[0007] S2, use the vehicle-mounted hanging basket to lift the construction personnel to the joint door shaft of the hydraulic cylinder, use the joint door shaft removal tool to remove the joint door shaft, then retract the piston rod of the hydraulic cylinder into the cylinder body, close the corresponding valve, and use the hand chain hoist and sling to lock the piston rod and the cylinder body to prevent the piston rod from slipping out of the cylinder body;

[0008] S3, lift the hydraulic cylinder so that the support hinge seat is located above the temporary working platform, and the construction personnel on the temporary working platform remove the pin shaft of the support hinge seat bearing;

[0009] S4, lift the hydraulic cylinder to the designated position and remove the spherical bearing using a bearing removal tool;

[0010] S5, check the removed pin shaft and spherical bearing, determine the cause of the jam and repair or replace them, then reinstall them and test run the reinstalled hydraulic cylinder.

[0011] In some embodiments, in step S1, the step of installing a temporary work platform includes: using a vehicle-mounted hanging basket to lift construction workers to the work position, vertically fixing multiple I-beams on the concrete wall as the platform foundation; installing reinforcing ribs between the lower end of each I-beam and the concrete wall; installing a steel plate above the platform foundation as a platform; and installing a guardrail on the edge of the platform.

[0012] In some embodiments, anti-slip patterns are evenly distributed on the steel plate.

[0013] In some embodiments, the door shaft removal tool includes a T-shaped plate and two first screw jacks. The T-shaped plate has a wide part and a narrow part. When in use, the end face of the narrow part of the T-shaped plate is first welded and fixed to the end face of the door shaft, and the two first screw jacks are placed between the wide part of the T-shaped plate and the gates on both sides of the door shaft. The two first screw jacks are located on both sides of the narrow part of the T-shaped plate. The two first screw jacks are rotated at a uniform speed at the same time, so that the two ends of the first screw jacks are respectively pressed against the T-shaped plate and the gate, and the first screw jacks are continued to be rotated to gradually pull the door shaft outward from the gate until the door shaft is separated from the hydraulic cylinder.

[0014] In some embodiments, the size of the wide portion of the T-shaped plate is 400*200*20 mm, and the size of the narrow portion is 300*100*20 mm.

[0015] In some embodiments, the door coupling shaft is preheated before the narrow portion of the T-plate is welded to the door coupling shaft.

[0016] In some embodiments, during the process of pulling out the door connecting shaft, the top end of the door connecting shaft is tapped lightly with a hammer to eliminate the stress of local jamming.

[0017] In some embodiments, the bearing removal tool includes two full-thread screws, four nuts, a stress-bearing steel plate and two second screw jacks. The length of the stress-bearing steel plate is greater than the outer diameter of the joint bearing. The stress-bearing steel plate has two through holes symmetrically provided in the length direction. When in use, the two full-thread screws are first screwed into two opposite screw holes on the joint bearing. The screwing depths of the two full-thread screws are equal. The two nuts are screwed into the two full-thread screws respectively, and then the stress-bearing steel plate is inserted into the two full-thread screws so that the side of the stress-bearing steel plate facing the joint bearing is aligned with the joint shaft. The end faces of the bearing are parallel, and the remaining two nuts are screwed into the two full-thread screws respectively to lock the load-bearing steel plate; then two second screw jacks are placed between the load-bearing steel plate and the cylinder head outside the spherical bearing, and the two second screw jacks are located on the opposite sides of the outside of the spherical bearing. The two second screw jacks are rotated at a uniform speed at the same time, so that the two ends of the second screw jacks are respectively pressed against the load-bearing steel plate and the cylinder head, and the second screw jacks are continued to be rotated to gradually pull the spherical bearing outward from the axial hole of the cylinder head until the spherical bearing is separated from the hydraulic cylinder.

[0018] In some embodiments, in step S5, before reinstalling the spherical plain bearing, a wind and rainproof workshop is set up to provide a dust-free environment.

[0019] In some embodiments, in step S1, before installing the temporary working platform, first check the components of the maintenance gate of the hydraulic cylinder, remove debris, and after confirming that the maintenance gate and its opening and closing system are normal, drop the maintenance gate and check for water leakage. When the leakage of the maintenance gate affects the normal maintenance of the hydraulic cylinder, it is handled in time until the requirements are met. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings.

[0021] in:

[0022] Figure 1 It is a flow chart of a method for disassembling and assembling a large-size hydraulic cylinder spherical bearing in an embodiment of the present invention;

[0023] Figure 2 Schematic diagram of the installation position of a temporary work platform in an embodiment of the present invention;

[0024] Figure 3 Schematic diagram of the use of the door shaft removal tool in the embodiment of the present invention;

[0025] Figure 4 A schematic diagram of the use of a bearing removal tool in an embodiment of the present invention;

[0026] Reference numerals:

[0027] 1. Joint bearing; 2. Temporary working platform; 3. First screw jack; 4. T-plate; 5. Door shaft; 6. Load-bearing steel plate; 7. Full-thread screw; 8. Second screw jack; 9. Support hinge seat. DETAILED DESCRIPTION

[0028] 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.

[0029] The following describes a method for disassembling and assembling a large-size hydraulic cylinder spherical bearing according to an embodiment of the present invention with reference to the accompanying drawings.

[0030] like Figure 1-4 As shown, the embodiment of the present invention provides a method for disassembling and assembling a large-size hydraulic cylinder joint bearing, comprising the following steps:

[0031] S1, install a temporary working platform 2 for removing the pin shaft of the support hinge seat bearing, and install a ladder at the connection between the temporary working platform 2 and the original walking platform;

[0032] S2, use the vehicle-mounted hanging basket to lift the construction personnel to the joint door shaft 5 of the hydraulic cylinder, use the joint door shaft removal tool to remove the joint door shaft 5, then retract the piston rod of the hydraulic cylinder into the cylinder body, close the corresponding valve, and use the hand chain hoist and sling to lock the piston rod and the cylinder body to prevent the piston rod from slipping out of the cylinder body;

[0033] S3, lift the hydraulic cylinder so that the support hinge seat 9 is located above the temporary working platform 2, and the construction personnel of the temporary working platform 2 remove the pin shaft of the support hinge seat bearing;

[0034] S4, lifting the hydraulic cylinder to a designated position, and removing the spherical bearing 1 using a bearing removal tool;

[0035] S5, check the removed pin shaft and spherical bearing 1, determine the cause of the jam and repair or replace them, then reinstall them and test run the reinstalled hydraulic cylinder.

[0036] The embodiment of the present invention greatly shortens the time for handling the jamming problem of the large-sized hydraulic cylinder joint bearing 1 through the above method, and no longer needs to be transported over long distances to professional manufacturers for processing, thereby reducing the risk of long-distance transportation. The reliability of the gate system is greatly improved, providing a strong guarantee for the flood prevention and flood prevention tasks of the hydropower station. The cost of handling the jamming problem of the large-sized hydraulic cylinder joint bearing 1 and the transportation cost are greatly reduced.

[0037] By setting up a temporary work platform 2, it is easy to remove the pin, improve construction safety and work efficiency. In the past, only simple equipment such as a cage was used to lift the workers to the work site to remove the pin, which had low construction safety performance, limited number of workers, and when the car crane cooperated with the cage for construction, the cage was unstable when the workers were pulling out the pin, and the work efficiency was low. The fixed temporary work platform 2 of the embodiment of the present invention, on the one hand, increases the safety of construction work and ensures the personal safety of workers; on the other hand, it can increase the number of workers on a limited work surface and improve work efficiency; the third aspect is that it has a certain protective effect on the pin when the pin is pulled out. Because the overall weight of the pin is large (about 150 kg), the workers can fix the pin on a stable platform and then use the car crane to adjust the pin to the dam surface. In general, the temporary work platform 2 greatly improves construction safety, improves work efficiency, reduces the processing period, and reduces the processing cost.

[0038] Furthermore, the designated location is an open area on the dam top. The removal and various inspections of the spherical bearing 1 are completed on the dam top, which saves time and effort and improves work efficiency.

[0039] In some embodiments, Figure 2 As shown, in step S1, the steps of installing the temporary work platform 2 include: using a vehicle-mounted hanging basket to lift the construction personnel to the work position, vertically fixing multiple I-beams on the concrete wall as the platform foundation; installing reinforcing ribs between the lower end of each I-beam and the concrete wall; installing a steel plate above the platform foundation as a platform; and installing a guardrail on the edge of the platform.

[0040] Furthermore, the installation materials include a number of 5# angle steels, a number of 10# channel steels, a 25mm*400mm*400mm steel plate, a number of 10# I-beams and M30 expansion bolts. The load-bearing capacity of the temporary work platform 2 is 500kg.

[0041] Further, after the temporary work platform 2 is erected, a simple load-bearing test is performed to check whether there are no cracks at each weld, whether the expansion bolts are tight and reliable, and whether the bottom plate steel plate is deformed. After the operation is completed, the temporary work platform 2 can be dismantled and reused.

[0042] In some embodiments, anti-slip grooves are evenly distributed on the steel plate.

[0043] In some embodiments, Figure 3As shown, the door shaft removal tool includes a T-plate 4 and two first screw jacks 3. The T-plate 4 has a wide part and a narrow part. When in use, the end face of the narrow part of the T-plate 4 is first welded and fixed to the end face of the door shaft 5, and the two first screw jacks 3 are placed between the wide part of the T-plate 4 and the gates on both sides of the door shaft 5. The two first screw jacks 3 are located on both sides of the narrow part of the T-plate 4. The two first screw jacks 3 are rotated at a uniform speed at the same time, so that the two ends of the first screw jacks 3 are respectively pressed against the T-plate 4 and the gate, and the first screw jacks 3 are continued to be rotated to gradually pull the door shaft 5 outward from the gate until the door shaft 5 is separated from the hydraulic cylinder.

[0044] By providing a door shaft removal tool, it is possible to avoid the door shaft 5 from tilting due to uneven force, thereby preventing the door shaft 5 from getting stuck with the door shaft hole.

[0045] Further, the T-shaped plate 4 and the door connecting shaft 5 are welded in a full welding manner. During welding, slag inclusion and leakage of welding should be avoided.

[0046] Furthermore, the first screw jack 3 is a 15t screw jack.

[0047] It should be noted that the removal of the gate shaft 5 is a difficult point in the process. Because the gate shaft 5 is nested inside the gate body, the right end of the gate shaft 5 is close to the water surface of the gate side, and the distance is only 20cm, so the removal of the gate shaft 5 can only be carried out from the left side of the gate body. Because the power station gate system has been in operation for several years, and the gate shaft 5 is at the bottom of the gate, it is affected by the environment (high humidity all year round), and there is a possibility of rust between the gate shaft 5 and the gate, so the removal of the gate shaft 5 must be carried out by special tools. The design of this gate shaft 5 removal device relies on the unilateral force of the end of the gate shaft 5 to slowly pull the gate shaft 5 out of the gate shaft hole. Considering the reasons such as rust, two 15t screw jacks are selected to evenly apply force to avoid the tilt of the gate shaft due to uneven force, which causes the gate shaft 5 and the gate shaft hole to get stuck.

[0048] In some embodiments, the size of the wide portion of the T-shaped plate 4 is 400*200*20 mm, and the size of the narrow portion is 300*100*20 mm.

[0049] In some embodiments, the door connecting shaft 5 is preheated before the narrow portion of the T-shaped plate 4 is welded to the door connecting shaft 5 to ensure the welding quality.

[0050] In some embodiments, when the door connecting shaft 5 is slowly pulled outward, the top end of the door connecting shaft 5 is tapped lightly with a hammer to eliminate the stress of local jamming.

[0051] In some embodiments, Figure 4As shown, the bearing removal tool includes two full-thread screws 7, four nuts, a stress-bearing steel plate 6 and two second screw jacks 8. The length of the stress-bearing steel plate 6 is greater than the outer diameter of the joint bearing 1. The stress-bearing steel plate 6 has two through holes symmetrically provided in the length direction. When in use, first screw the two full-thread screws 7 into the two opposite screw holes on the joint bearing 1. The screw-in depths of the two full-thread screws 7 are equal. Screw the two nuts into the two full-thread screws 7 respectively, and then insert the stress-bearing steel plate 6 into the two full-thread screws 7 so that the side of the stress-bearing steel plate 6 facing the joint bearing 1 is parallel to the end face of the joint bearing 1. , and then use the remaining two nuts to screw into the two full-thread screws 7 respectively to lock the load-bearing steel plate 6; then use two second screw jacks 8 to place between the load-bearing steel plate 6 and the cylinder head outside the spherical bearing 1, and the two second screw jacks 8 are located on the opposite sides of the outside of the spherical bearing 1. The two second screw jacks 8 are rotated at a uniform speed at the same time, so that the two ends of the second screw jacks 8 are respectively pressed against the load-bearing steel plate 6 and the cylinder head, and the second screw jacks 8 are continued to be rotated to balance the force, and the spherical bearing 1 is gradually pulled out from the axial hole of the cylinder head until the spherical bearing 1 is separated from the hydraulic cylinder.

[0052] By using the bearing removal tool according to the embodiment of the present invention to remove the spherical bearing 1, the integrity of the spherical bearing 1 during disassembly can be ensured, so that the cause of the spherical bearing 1 being stuck can be checked more intuitively and maintenance measures can be determined.

[0053] It should be noted that the removal of the spherical bearing 1 is carried out by hoisting the hydraulic cylinder to the top of the dam. The research and development of this set of bearing removal tools is mainly based on the maximum protection of existing equipment. Under normal circumstances, the stuck spherical bearing 1 can only be disassembled in a destructive way, but this set of devices can ensure the integrity of the spherical bearing 1 during disassembly, so as to more intuitively check the cause of the jamming of the spherical bearing 1 and determine the maintenance measures. The entire set of spherical bearings 1 is taken out, and after wiping and cleaning, the wear of the self-lubricating surface of the spherical bearing 1, the wear of the contact surface between the spherical bearing 1 and the sleeve, and the wear of the contact surface between the spherical bearing 1 and the pin shaft are checked to determine which equipment has a problem and take corresponding measures.

[0054] Furthermore, the size of the full-thread screw 7 is M16*500, and a fine-pitch screw is used to ensure the strength of the screw. The second screw jack 8 is a 5t screw jack. The force-bearing steel plate 6 is a 100*400*20mm steel plate.

[0055] Furthermore, the distance between the load-bearing steel plate 6 and the top end of the screw rod is 400 mm.

[0056] In some embodiments, in step S5, before reinstalling the spherical plain bearing 1, a wind and rainproof workshop is set up to provide a dust-free environment.

[0057] It should be noted that, compared with the pin pull-out operation surface, the dismantling construction environment of the spherical bearing 1 is better, but the fitting clearance between the spherical bearing 1 and the shaft hole of the hydraulic cylinder head is relatively small (generally the single-side clearance is only about 0.02mm), and it has relatively high requirements for the installation environment. Therefore, when installing the spherical bearing 1, a shed or workshop that meets the requirements must be set up first to avoid rainy or windy weather that affects the installation of the spherical bearing 1.

[0058] In some embodiments, in step S1, before installing the temporary working platform 2, first check the components of the maintenance gate of the hydraulic cylinder, remove debris, and after confirming that the maintenance gate and its opening and closing system are normal, drop the maintenance gate and check for water leakage. When the water leakage of the maintenance gate affects the normal maintenance of the hydraulic cylinder, it is handled in time until the requirements are met.

[0059] The present invention is further described below through specific examples.

[0060] Example 1

[0061] A method for disassembling and assembling a large-size hydraulic cylinder joint bearing comprises the following steps:

[0062] (1) Check the operation of the gate and hydraulic cylinder:

[0063] Carefully check the various components of the hydraulic cylinder's maintenance gate, remove all kinds of debris, and after confirming that the maintenance gate and its opening and closing system are normal, drop the maintenance gate and check for water leakage. If the leakage of the maintenance gate affects the normal maintenance of the hydraulic cylinder, it must be dealt with in a timely manner until the requirements are met.

[0064] (2) Construction preparation and setting up of temporary working platform 2:

[0065] Use a 25t truck crane to carry the hanging basket and lift the construction workers to the erection platform, that is, the joint door shaft 5 of the hydraulic cylinder. Use M30 expansion bolts to install three 10# I-beams (a steel plate with a thickness of 25mm and a length and width of 400mm*400mm has been welded to one end of the I-beam as the base plate) on the concrete wall below the upper support hinge seat 9 as the platform foundation. Install reinforcement ribs between the lower end of each I-beam and the concrete wall. On the basis of the I-beam, a platform with a height of about 1 meter and a length and width of 2m*2m is welded below the support hinge seat 9 using 10# channel steel and patterned steel plate to form a temporary work platform 2. Make a ladder at the junction of the temporary work platform 2 and the original walking platform to facilitate personnel to go up and down, and use 5# angle steel to set a guardrail with a height of 1.2 meters on the periphery of the temporary work platform 2. All welding parts should be welded firmly. After the temporary work platform 2 is erected, it is inspected and the welding points are checked with a professional welder's hammer to ensure firmness and stability.

[0066] (3) Remove the pins of the door shaft 5 and the support hinge bearing, and hoist the hydraulic cylinder to the dam surface:

[0067] Prepare the wire rope and lifting lugs, check whether the wire rope and lifting lugs meet the lifting requirements, and whether the appearance is intact and without cracks. After the dam top gantry rotary crane is arranged on site, place the boom hook in the designated position, hang the wire rope, and check whether the anti-unhooking device of the rotary crane hook is intact and normal. Hang the hydraulic cylinder wire rope (the lifting point at the end of the joint door shaft 5), and raise the hook until the wire rope is stressed and stop rising in time. Use the 25t truck crane to carry the hanging basket to lift the construction personnel to the joint door shaft 5, use the joint door shaft removal tool to push out the joint door shaft 5, and use the 5t hand chain hoist to assist in removing the joint door shaft 5. After the joint door shaft 5 is removed, it should be placed firmly to avoid rolling. After the joint door shaft 5 is removed, cooperate with the construction personnel to recycle the piston rod into the cylinder body, close the corresponding valve, and use the 5t hand chain hoist and sling to lock the piston rod and hydraulic cylinder firmly to prevent the hydraulic cylinder piston rod from slipping out. Note that when the piston rod is retracted, the ball valve at the outlet of the other hydraulic pump station is closed. Lift the rotary hook. During the lifting process, make sure that the lifting point and the center of gravity of the heavy object are in the same straight line. When the hydraulic cylinder reaches the horizontal position, stop the lifting operation. Use a 25t truck crane to hang the 9 lifting point wire ropes of the hydraulic cylinder support hinge seat on the rotary hook, and use a 20t hand chain hoist to adjust the tightness of the lifting point and the hook. Remove the hydraulic pipeline and electrical components, wrap the pipe opening with a clean white cloth to prevent foreign objects from entering, store the electrical components after marking, and wrap the cable connectors to avoid damage.

[0068] Lift the hydraulic cylinder until the support hinge seat 9 is located at the temporary working platform 2, remove the pin of the support hinge seat bearing, use the puller to push the pin out, use a 25t truck crane to assist in the disassembly process, and after the disassembly is completed, use a 25t truck crane to lift the pin to the designated workstation on the dam surface for storage. After the pin is removed, use a 32t rotating crane hook to lift the hydraulic cylinder out, adjust the level of the hydraulic cylinder, place the hydraulic cylinder in an open area on the dam top, and take measures to prevent the hydraulic cylinder from rolling or falling.

[0069] A closed, tight, fireproof and rainproof temporary processing workshop is set up at the joint bearing 1 location.

[0070] (4) Production of bearing removal tools and inspection and processing of spherical bearing 1:

[0071] According to the characteristics of the spherical bearing 1, a bearing removal tool is made on site, and the bearing removal tool is used to separate the spherical bearing 1 from the hydraulic cylinder so as to check the sticking conditions of the contact surface between the spherical bearing 1 and the pin shaft, the internal grinding surface of the spherical bearing 1, and the contact surface between the spherical bearing 1 and the hydraulic cylinder.

[0072] Production and use of bearing removal tools: Using the screw holes on the matching end faces of the hydraulic cylinder and the spherical bearing 1, screw two full-thread screws 7 symmetrically into the corresponding screw holes, ensuring that the screw-in depth is consistent, and leaving a 400mm distance at the top of the full-thread screw 7, fix the pre-prepared force-bearing steel plate 6 with nuts, ensuring that the distance between the two end faces of the steel plate and the end face of the spherical bearing 1 is consistent, and place two 5t screw jacks (operated by two people) between the force-bearing steel plate 6 and the spherical bearing 1, and then rotate the 5t screw jacks to balance the force. When two people operate the 5t screw jacks, the speed should be consistent. After the axial force is applied to the spherical bearing 1, it will gradually withdraw from the shaft hole of the hydraulic cylinder head. The spherical bearing 1 is then separated from the hydraulic cylinder.

[0073] Inspection and treatment of spherical bearing 1:

[0074] Disassemble the withdrawn spherical bearing 1, clean it, check the wear condition, check whether the self-lubricating material of the spherical bearing 1 is reliable; check whether there are scratches on the contact surface between the spherical bearing 1 and the pin, check whether the spherical bearing 1 can slide automatically, and determine the cause of the jamming of the spherical bearing 1. If the scratches are serious or the self-lubricating material is damaged, replace the spherical bearing 1 with a new one.

[0075] Check the dislodged pin to see if there are any scratches on the contact surface between the pin and the joint bearing 1, so as to determine where the problem of the joint bearing 1 is stuck. According to the design principle, when the gate is opened and closed normally, the joint bearing 1 and the pin should be relatively still without relative sliding or relative rotation.

[0076] (5) Reinstallation and debugging of hydraulic cylinder:

[0077] Reinstall the equipment in the order of disassembly described above, and replace the equipment with problems (such as pins, spherical bearings 1 or accessories, etc.) during reinstallation. After the hydraulic cylinder is installed, clean and remove the auxiliary facilities used for the hydraulic cylinder overhaul, and test run the hydraulic cylinder after repair under the guidance of the equipment manufacturer's technicians. The test run includes dry test run and dynamic water test run.

[0078] The waterless trial run is carried out after cleaning and dismantling the auxiliary facilities used for the hydraulic cylinder maintenance. That is, the gate is reciprocated at full opening without water. Check whether there are any abnormal conditions in various parts of the gate during operation, especially the hydraulic cylinder and hydraulic system parts. If so, find out the cause and eliminate the fault. If everything is normal, carry out the dynamic water trial run of the gate.

[0079] The dynamic water trial run is carried out after the gate's waterless trial run is normal, that is, the gate is fully opened and reciprocated under dynamic water conditions to check whether there are any abnormal conditions in various parts of the gate during operation, especially the hydraulic cylinder part. If so, the cause is found and the fault is eliminated. If everything is normal, the gate hydraulic cylinder maintenance work is successfully completed.

[0080] In the description of the present invention, it should be understood that 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 technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features.

[0081] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; 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.

[0082] In the present invention, the term "some embodiments" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments and features of the different embodiments described in this specification without contradiction.

[0083] 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 disassembling and assembling a large-size hydraulic cylinder joint bearing, characterized in that: The steps include: S1, installing a temporary working platform for removing the pin shaft of the support hinge seat bearing, and installing a ladder at the connection between the temporary working platform and the original walking platform; S2, use the vehicle-mounted hanging basket to lift the construction personnel to the joint door shaft of the hydraulic cylinder, use the joint door shaft removal tool to remove the joint door shaft, then retract the piston rod of the hydraulic cylinder into the cylinder body, close the corresponding valve, and use the hand chain hoist and sling to lock the piston rod and the cylinder body to prevent the piston rod from slipping out of the cylinder body; S3, lifting the hydraulic cylinder so that the support hinge seat is located above the temporary working platform, and the construction personnel of the temporary working platform remove the pin shaft of the support hinge seat bearing; S4, lift the hydraulic cylinder to the designated position and remove the spherical bearing using a bearing removal tool; S5, check the removed pin shaft and spherical bearing, determine the cause of the jam and repair or replace them, then reinstall them and test run the reinstalled hydraulic cylinder.

2. The method for disassembling and assembling a large-size hydraulic cylinder joint bearing according to claim 1, characterized in that: In step S1, the steps of installing the temporary work platform include: using a vehicle-mounted hanging basket to lift the construction workers to the work position, vertically fixing multiple I-beams on the concrete wall as the platform foundation; installing reinforcing ribs between the lower end of each I-beam and the concrete wall; installing a steel plate above the platform foundation as a platform; and installing a guardrail on the edge of the platform.

3. The method for disassembling and assembling a large-size hydraulic cylinder joint bearing according to claim 2, characterized in that: The anti-slip patterns are evenly distributed on the steel plate.

4. The method for disassembling and assembling a large-size hydraulic cylinder joint bearing according to claim 1, characterized in that: The door-connecting shaft removal tool includes a T-shaped plate and two first screw jacks, wherein the T-shaped plate has a wide portion and a narrow portion. When in use, the end face of the narrow portion of the T-shaped plate is first welded and fixed to the end face of the door-connecting shaft, and the two first screw jacks are placed between the wide portion of the T-shaped plate and the gates on both sides of the door-connecting shaft. The two first screw jacks are located on both sides of the narrow portion of the T-shaped plate. The two first screw jacks are rotated at a uniform speed at the same time, so that the two ends of the first screw jacks are respectively pressed against the T-shaped plate and the gate, and the first screw jack is continued to be rotated to gradually pull the door-connecting shaft outward from the gate until the door-connecting shaft is separated from the hydraulic cylinder.

5. The method for disassembling and assembling a large-size hydraulic cylinder joint bearing according to claim 4, characterized in that: The size of the wide part of the T-shaped plate is 400*200*20mm, and the size of the narrow part is 300*100*20mm.

6. The method for disassembling and assembling a large-size hydraulic cylinder joint bearing according to claim 4, characterized in that: The door connecting shaft is preheated before the narrow portion of the T-shaped plate is welded to the door connecting shaft.

7. The method for disassembling and assembling a large-size hydraulic cylinder joint bearing according to claim 4, characterized in that: During the process of pulling out the door connecting shaft, tap the top end of the door connecting shaft lightly with a hammer to eliminate the stress of local jamming.

8. The method for disassembling and assembling a large-size hydraulic cylinder joint bearing according to claim 1, characterized in that: The bearing removal tool includes two full-thread screws, four nuts, a stress-bearing steel plate and two second screw jacks. The length of the stress-bearing steel plate is greater than the outer diameter of the joint bearing. The stress-bearing steel plate has two through holes symmetrically provided in the length direction. When in use, the two full-thread screws are first screwed into two opposite screw holes on the joint bearing. The screwing depths of the two full-thread screws are equal. The two nuts are respectively screwed into the two full-thread screws. Then, the stress-bearing steel plate is inserted into the two full-thread screws so that the side of the stress-bearing steel plate facing the joint bearing is parallel to the end face of the joint bearing. , and then use the remaining two nuts to screw into the two full-thread screws respectively to lock the load-bearing steel plate; then use the two second screw jacks to place between the load-bearing steel plate and the cylinder head outside the joint bearing, and the two second screw jacks are located on the opposite sides of the outside of the joint bearing. The two second screw jacks are rotated at a uniform speed at the same time, so that the two ends of the second screw jacks are respectively pressed against the load-bearing steel plate and the cylinder head, and the second screw jacks are continued to rotate to gradually pull the joint bearing outward from the axial hole of the cylinder head until the joint bearing is separated from the hydraulic cylinder.

9. The method for disassembling and assembling a large-size hydraulic cylinder joint bearing according to claim 1, characterized in that: In step S5, before reinstalling the spherical plain bearing, a wind and rainproof workshop is set up to provide a dust-free environment.

10. The method for disassembling and assembling a large-size hydraulic cylinder joint bearing according to claim 1, characterized in that: In step S1, before installing the temporary working platform, first check the components of the maintenance gate of the hydraulic cylinder, remove debris, and after confirming that the maintenance gate and its opening and closing system are normal, drop the maintenance gate and check for water leakage. When the water leakage of the maintenance gate affects the normal maintenance of the hydraulic cylinder, it is handled in time until the requirements are met.

Images