Method for repairing and replacing a working cylinder of a hydraulic press

Abstract

The present application relates to the technical field of hydraulic machine parts repair, and provides a hydraulic machine working cylinder repair and replacement method, which comprises the following steps: driving the upper cross beam to descend to different height positions by the lifting cylinder to remove the connecting accessories of the closed frame, the first main working cylinder and the first side working cylinder, the lengthened rod and the main body component of the closed frame; transporting the first main working cylinder and the first side working cylinder to a repair destination; transporting the assembled second main working cylinder and third side working cylinder to a working cylinder installation position and completing the installation work; and reassembling the closed frame, and connecting the two ends of the lengthened rod to the upper cross beam and the lifting cylinder respectively. The above steps complete the removal and replacement work of the faulty working cylinder in the narrow closed frame, and the operation is more smooth and convenient, and the repair efficiency of the faulty working cylinder is higher.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydraulic machine parts repair, in particular to a hydraulic machine working cylinder repair and replacement method. BACKGROUND

[0002] The hydraulic machine, for example, a three-beam double-column down-draw hydraulic machine, is mainly used for metal material pressing process, such as stamping, bending, forming, accumulation, sheet stretching and powder product pressing forming, etc., and can also be used for plastic product hot-pressing forming process. The three-beam double-column down-draw hydraulic machine mainly comprises two columns, an upper horizontal beam, a fixed beam and a lower horizontal beam vertically and spaced apart, and working cylinders and a lifting cylinder and other auxiliary parts. Each column is provided with a pull rod assembly, and the upper and lower ends of the pull rod assembly extending out of the column are connected with the upper horizontal beam and the lower horizontal beam respectively and enclose a closed frame. The cylinder bodies of four working cylinders and the cylinder body of a lifting cylinder are installed on the fixed beam. Since part of the structure of the fixed beam is in the basement below the ground, the working cylinders below the fixed beam and the lower horizontal beam are also in the basement. The plungers of the four working cylinders are all downward to connect the lower horizontal beam, and the plunger of the lifting cylinder is upward to connect the upper horizontal beam through an extension rod. The working cylinders and the lifting cylinder cooperate to drive the whole closed frame to move up and down.

[0003] However, when the working cylinders fail, the following methods are usually used. For example, maintenance personnel first enter the basement, and then enter the closed frame to remove the working cylinders which are used frequently and prone to failure. However, since the working cylinders are in the narrow area of the closed frame in the basement, the narrow space of the closed frame interferes with and is inconvenient for the removal and replacement of the failed working cylinders, thereby affecting the maintenance efficiency of the failed working cylinders. SUMMARY

[0004] The problem solved by the present application is how to improve the maintenance efficiency of the working cylinders in the narrow closed frame.

[0005] To solve the above problems, the present application provides a hydraulic machine working cylinder repair and replacement method. The hydraulic machine comprises columns, an upper horizontal beam, a fixed beam, a lower horizontal beam, working cylinders and a lifting cylinder. A plurality of columns arranged in parallel are respectively arranged in the upper horizontal beam, the fixed beam and the lower horizontal beam arranged vertically and spaced apart. A plurality of working cylinders are arranged at intervals. The working cylinders in the space enclosed by the plurality of columns are first main working cylinders, and the working cylinders to be removed outside the space are first side working cylinders. The opposite ends of each working cylinder are connected to the fixed beam and the lower horizontal beam respectively. A pull rod assembly is arranged in the column, and the upper and lower ends of the pull rod assembly extending out of the column are connected to the upper horizontal beam and the lower horizontal beam respectively and enclose a closed frame. The lifting cylinder is arranged on the fixed beam, and the lifting end of the lifting cylinder is connected to the upper horizontal beam through an extension rod.

[0006] The method for repairing and replacing the working cylinder of a hydraulic press comprises the following steps:

[0007] The upper cross beam is driven to descend to different height positions by the lifting cylinder to remove the connecting accessories of the closed frame, the first main working cylinder and the first side working cylinder, the extension rod and the main body member of the closed frame;

[0008] The first main working cylinder and the first side working cylinder are transported to a repair destination;

[0009] The assembled second main working cylinder and third side working cylinder are transported to a working cylinder installation position and the installation work is completed;

[0010] The closed frame is reassembled and the two ends of the extension rod are connected to the upper cross beam and the lifting cylinder respectively.

[0011] Optionally, the driving of the upper cross beam to descend to different height positions by the lifting cylinder to remove the connecting accessories of the closed frame, the first main working cylinder and the first side working cylinder, the extension rod and the main body member of the closed frame comprises:

[0012] The upper cross beam of the closed frame is adjusted to descend to a first height position by the lifting cylinder;

[0013] The connecting accessories of the closed frame are removed from the column; wherein the connecting accessories comprise a column limiting sleeve, and the connecting accessories are used to limit the lifting position of the upper cross beam relative to the column.

[0014] The first connecting member between the cylinder body of the first main working cylinder and the first side working cylinder and the fixed beam is removed, and the second connecting member between the plunger of the first main working cylinder and the first side working cylinder and the lower cross beam is removed.

[0015] Optionally, the driving of the upper cross beam to descend to different height positions by the lifting cylinder to remove the connecting accessories of the closed frame, the first main working cylinder and the first side working cylinder, the extension rod and the main body member of the closed frame further comprises:

[0016] The upper cross beam is adjusted to descend from the first height position to a second height position by the lifting cylinder;

[0017] The cylinder body of the first main working cylinder and the first side working cylinder is jacked by a jacking device to be higher than the fixed beam; and the extension rod between the upper cross beam and the lifting cylinder is removed.

[0018] Optionally, the step of driving the upper cross beam to descend to different height positions by the lifting cylinder to dismount the connecting accessories of the enclosed frame, the first main working cylinder and the first side working cylinder, the extension rod and the main body member of the enclosed frame further comprises:

[0019] a step of arranging a cushion plate below the lower cross beam;

[0020] a step of adjusting the upper cross beam to descend from the second height position to a third height position by the lifting cylinder to drive the lower cross beam to fall onto the cushion plate, at which time the first main working cylinder and the first side working cylinder fall onto the cushion plate with the lower cross beam;

[0021] a step of dismounting the main body member of the enclosed frame; the main body member comprises the pull rod assembly, the upper cross beam and the stand column.

[0022] Optionally, after the first main working cylinder and the first side working cylinder fall onto the cushion plate with the lower cross beam, the method further comprises:

[0023] a step of fixing the first main working cylinder and the first side working cylinder by binding;

[0024] a step of dismounting the third connecting member of the lower cross beam from the plunger of the second side working cylinder and fixing and suspending the cylinder body and the plunger of the second side working cylinder on the fixed beam; wherein the working cylinder that does not need to be dismounted and is outside the space is the second side working cylinder.

[0025] Optionally, the step of transferring the first main working cylinder and the first side working cylinder to the maintenance destination comprises:

[0026] a step of laying a transportation track above the lower cross beam;

[0027] a step of placing a transportation device on the transportation track, hoisting the dismounted first main working cylinder and the first side working cylinder onto the transportation device and transferring the first main working cylinder and the first side working cylinder to the maintenance destination by the transportation device.

[0028] Optionally, the step of transferring the assembled second main working cylinder and the third side working cylinder to the working cylinder installation position and completing the installation work thereof comprises:

[0029] a step of transferring the assembled second main working cylinder and the third side working cylinder by a transportation device;

[0030] a step of hoisting the second main working cylinder and the third side working cylinder to the working cylinder installation position by a hoisting device; the installation position of the second main working cylinder is the position of the first main working cylinder before dismounting and the installation position of the third side working cylinder is the position of the first side working cylinder before dismounting;

[0031] Assembling a first connecting member between the cylinder body of the second main working cylinder and the third side working cylinder and the fixed beam, and assembling a second connecting member between the plunger of the second main working cylinder and the third side working cylinder and the lower cross beam.

[0032] Optionally, the reassembling of the closed frame includes connecting two ends of the lengthened rod to the upper cross beam and the lifting cylinder, respectively.

[0033] Reassembling a main body member of the closed frame; wherein the main body member includes the pull rod assembly, the upper cross beam and the column;

[0034] Driving the upper cross beam to different height positions by the lifting cylinder to assemble the connecting accessories of the lengthened rod and the closed frame.

[0035] Optionally, the reassembling of the main body member of the closed frame includes:

[0036] Lifting back the column by the first automobile crane, lifting back the pull rod member of the pull rod assembly by the second automobile crane, and setting the pull rod member in the column;

[0037] Lifting back the upper cross beam by the first automobile crane, and aligning the upper cross beam with the pull rod member;

[0038] Connecting the nut member of the pull rod assembly to the pull rod member to fasten the upper cross beam and the lower cross beam to the top end and the bottom end of the column, respectively.

[0039] Optionally, the driving of the upper cross beam to different height positions by the lifting cylinder to assemble the connecting accessories of the lengthened rod and the closed frame includes:

[0040] Adjusting the upper cross beam of the closed frame to the second height position by the lifting cylinder to reassemble the lengthened rod between the upper cross beam and the lifting cylinder;

[0041] Adjusting the upper cross beam of the closed frame to the first height position by the lifting cylinder to reassemble the connecting accessories on the column.

[0042] Compared with the prior art, the hydraulic machine at least includes a column, an upper cross beam, a lower cross beam, a first main working cylinder, a first side working cylinder and a second side working cylinder, a pull rod assembly extending out of the upper and lower ends of the column to connect the upper cross beam and the lower cross beam, respectively, and surrounding a closed frame. Since the second side working cylinder is used less frequently, it is not prone to failure. The first main working cylinder and the first side working cylinder are used more frequently and are relatively prone to failure.

[0043] When the first main working cylinder and the first side working cylinder need to be repaired and replaced, the connecting accessories of the closed frame can be removed first, wherein the connecting accessories can include a column limiting sleeve arranged on the column to limit the lifting position of the upper cross beam relative to the column, and the removal of the connecting accessories not only removes the limitation of the lowering action of the upper cross beam and the working cylinders in the closed frame, but also facilitates the subsequent removal of the upper cross beam from the column. When the upper cross beam is lowered to different height positions, it is convenient for maintenance personnel to remove the first main working cylinder and the first side working cylinder and the lengthening rod arranged between the lifting end of the lifting cylinder and the upper cross beam, so that the removal of the lengthening rod can avoid interference with the lowering of the upper cross beam. Since the connecting accessories of the closed frame and the lengthening rod have been removed, the main body member of the closed frame is prepared for disassembly, and then the main body member of the closed frame is disassembled, and the disassembly of the main body member of the closed frame facilitates the subsequent lifting and transportation process of the first main working cylinder and the first side working cylinder.

[0044] After the main body member of the closed frame is disassembled, the first main working cylinder and the first side working cylinder that have been removed are transported to a maintenance destination, so as to leave installation space for the new second main working cylinder and the third side working cylinder in the subsequent step.

[0045] The assembled second main working cylinder and the third side working cylinder are transported to the working cylinder installation position, and the installation of the second main working cylinder and the third side working cylinder is completed; wherein the assembled second main working cylinder and the third side working cylinder refer to normal second main working cylinder and third side working cylinder, or the first main working cylinder and the first side working cylinder that have been repaired.

[0046] Finally, the closed frame is reassembled, and the two ends of the lengthening rod are connected to the upper cross beam and the lifting cylinder respectively, so that the assembly of the lengthening rod is completed.

[0047] In summary, the above steps are used to complete the removal and replacement of the faulty working cylinder in the narrow closed frame, which is more convenient and efficient for maintenance of the faulty working cylinder. BRIEF DESCRIPTION OF DRAWINGS

[0048] Figure 1 The flowchart of the working cylinder repair and replacement method of the hydraulic machine in the embodiment of the application;

[0049] Figure 2 The structure diagram of the hydraulic machine in the embodiment of the application.

[0050] Explanation of reference signs:

[0051] 1 - upright; 2 - upper cross member; 3 - fixed beam; 4 - lower cross member; 5 - lift cylinder; 6 - extension rod; 7 - tie rod assembly; 8 - first main working cylinder; 9 - first side working cylinder; 10 - second side working cylinder. DETAILED DESCRIPTION

[0052] In order to make the above objectives, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0053] It should be noted that in the coordinate system XZ provided herein, the right direction is represented by the positive direction of the X axis, the left direction is represented by the negative direction of the X axis, the upward direction is represented by the positive direction of the Z axis, and the downward direction is represented by the negative direction of the Z axis. At the same time, it should be noted that the terms "first", "second", and the like in the description and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0054] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "arranged", "mounted", "connected", and "linked" should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected; can be directly connected, or indirectly connected through an intermediate medium; can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0055] In the description of the present application, the description of the terms "embodiment", "one embodiment", and "one implementation" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or implementation are included in at least one embodiment or implementation of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or implementation. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or implementations in a suitable manner.

[0056] In conjunction with Figure 2As shown, the hydraulic machine provided by the embodiment of the present application comprises a column 1, an upper beam 2, a fixed beam 3, a lower beam 4, a working cylinder and a lifting cylinder 5, a plurality of columns 1 arranged in parallel are respectively arranged in the upper beam 2, the fixed beam 3 and the lower beam 4 arranged in an up-down interval, a plurality of working cylinders are arranged in an interval, the working cylinders in a space surrounded by the columns 1 are first main working cylinders 8, the working cylinders outside the space to be removed are first side working cylinders 9, and the working cylinders outside the space without removal are second side working cylinders 10, and the opposite ends of each working cylinder are connected to the fixed beam 3 and the lower beam 4 respectively, a pull rod assembly 7 is arranged in the column 1, and the upper and lower ends of the pull rod assembly 7 extending out of the column 1 are connected to the upper beam 2 and the lower beam 4 respectively and surround a closed frame, the lifting cylinder 5 is arranged on the fixed beam 3, and the lifting end of the lifting cylinder 5 is connected to the upper beam 2 through an extension rod 6.

[0057] It should be noted that the hydraulic machine of the present application is not limited to the three-beam double-column down-drawing hydraulic machine described above, but can also be other types of hydraulic machines, such as a three-beam four-column hydraulic machine, etc., which are not specifically limited here.

[0058] A plurality of columns 1 are arranged in an interval in a horizontal direction along the X-axis direction of a coordinate system, and the upper beam 2, the fixed beam 3 and the lower beam 4 are arranged in an interval in an up-down direction along the Z-axis direction of the coordinate system, a small part of the structure of the fixed beam 3 is above the ground, and most of the structure of the fixed beam 3 is below the ground in a basement, and the cylinder bodies of the four working cylinders are connected to the fixed beam 3, and the plungers of the four working cylinders are all downward to connect the lower beam 4, so the four working cylinders are also in the basement below the ground. Figure 2 Figure 2 The four working cylinders are arranged in an interval in a horizontal direction along the X-axis direction of a coordinate system, and the upper beam 2, the fixed beam 3 and the lower beam 4 are arranged in an interval in an up-down direction along the Z-axis direction of the coordinate system, a small part of the structure of the fixed beam 3 is above the ground, and most of the structure of the fixed beam 3 is below the ground in a basement, and the cylinder bodies of the four working cylinders are connected to the fixed beam 3, and the plungers of the four working cylinders are all downward to connect the lower beam 4, so the four working cylinders are also in the basement below the ground.

[0059] The number of working cylinders is four, and the number of columns 1 is two, the two columns 1 are arranged in an interval and can surround a space between them, the two working cylinders in the space are defined as first main working cylinders 8, so the number of first main working cylinders 8 is two, one working cylinder outside the space surrounded by the two columns 1, for example, on the left side, has a low frequency of use and a low failure rate, does not need to be removed, and can be defined as a second side working cylinder 10, and one working cylinder outside the space surrounded by the two columns 1, for example, on the right side, has a high frequency of use and a high failure rate, needs to be removed, and can be defined as a first side working cylinder 9. Figure 2

[0060] ​​At least one pull rod assembly 7 is arranged inside each column 1, the pull rod assembly 7 comprises a pull rod and a nut, the upper end of the pull rod extending out of the column 1 is connected to the upper cross beam 2 through a nut, and the lower end of the pull rod extending out of the column 1 is connected to the lower cross beam 4 through a nut, so that the two columns 1 can be connected to the upper cross beam 2 and the lower cross beam 4 through the pull rod assembly 7 to assemble the closed frame, at this time, two first main working cylinders 8 are arranged in the closed frame, and two first side working cylinders 9 are arranged outside the closed frame. The lifting cylinder 5 can be arranged on one side outside the space, the cylinder body of the lifting cylinder 5 can be arranged on the fixed beam 3, the plunger of the lifting cylinder 5 can be connected to the upper cross beam 2 through the extension rod 6, the upper cross beam 2 is driven by the lifting cylinder 5, and the lower cross beam 4 is driven by the four working cylinders at the same time, the upper cross beam 2 and the lower cross beam 4 are connected through the pull rod assembly 7, so as to realize the driving of the whole closed frame to move up and down.

[0061] To solve the above technical problems, in combination with Figure 1 The working cylinder maintenance and replacement method of the hydraulic machine is shown in the figure, and comprises the following steps:

[0062] S1, the upper cross beam 2 is driven by the lifting cylinder 5 to be lowered to different height positions, so as to remove the connecting accessories of the closed frame, the first main working cylinder 8 and the first side working cylinder 9, the extension rod 6 and the main body component of the closed frame;

[0063] S2, the first main working cylinder 8 and the first side working cylinder 9 are transported to the maintenance destination;

[0064] S3, the assembled second main working cylinder and third side working cylinder are transported to the working cylinder installation position, and the installation work is completed;

[0065] S4, reassemble the closed frame, and connect the two ends of the extension rod 6 to the upper cross beam 2 and the lifting cylinder 5 respectively.

[0066] It should be noted that in step S1, when the two first main working cylinders 8 and the first side working cylinder 9 need to be repaired and replaced due to failure, the connecting accessories of the closed frame can be removed first, wherein the connecting accessories on each stand 1 include two stand limiting sleeves, which are arranged on the stand 1 in an upper and lower spaced manner to limit the lifting position of the upper beam 2 relative to the stand 1, in other words, the two stand limiting sleeves arranged in an upper and lower spaced manner can play the roles of upper and lower limiting of the upper beam 2, and the removal of the connecting accessories not only removes the limitation of the lowering action of the upper beam 2 and each working cylinder in the closed frame, but also provides convenience for the subsequent dismounting operation of the upper beam 2 from the stand 1; in addition, the first main working cylinder and the first side working cylinder are removed when the upper beam 2 is lowered to a set height position, which facilitates the dismounting of the maintenance personnel at a suitable height position and facilitates the operation; further, the extension rod 6 between the lifting end of the lifting cylinder 5 and the upper beam 2 is removed after the upper beam 2 is lowered to a certain height, which can avoid the interference of the extension rod 6 on the lowering action of the upper beam 2, so that the upper beam 2 can continue to be lowered to facilitate the subsequent dismounting operation. Finally, since the connecting accessories of the closed frame and the extension rod 6 have been removed, the main components of the closed frame are prepared for the dismounting operation, and then the main components of the closed frame are removed, and the removal of the main components of the closed frame facilitates the subsequent lifting and transportation process of the first main working cylinder 8 and the first side working cylinder 9.

[0067] In step S2, after the main components of the closed frame are removed, the first main working cylinder 8 and the first side working cylinder 9 that have been removed due to failure are transported to a maintenance destination to provide installation space for the new second main working cylinder and the third side working cylinder in the subsequent steps.

[0068] In step S3, the assembled second main working cylinder and third side working cylinder are transported to the working cylinder installation position, and the installation of the second main working cylinder and the third side working cylinder is completed; wherein the assembled second main working cylinder and the third side working cylinder refer to the normal second main working cylinder and the third side working cylinder, or the first main working cylinder 8 and the first side working cylinder 9 that have been repaired.

[0069] In step S4, the closed frame is reassembled, and the two ends of the extension rod 6 are connected to the upper beam 2 and the lifting cylinder 5 respectively, so that the assembly of the extension rod 6 is completed.

[0070] In summary, the dismounting and replacement operation of the failed working cylinder in the narrow closed frame is completed through the above steps, which is more smooth and convenient to operate, and the maintenance efficiency of the failed working cylinder is higher.

[0071] In one embodiment of the present application, S1, the upper cross beam 2 is driven to descend to different height positions by the lifting cylinder 5 to remove the connecting accessories of the closed frame, the first main working cylinder 8 and the first side working cylinder 9, the lengthened rod 6 and the main body member of the closed frame, which comprises:

[0072] S11, the upper cross beam 2 of the closed frame is adjusted to descend to a first height position by the lifting cylinder 5;

[0073] S12, the connecting accessories of the closed frame are removed from the column 1; wherein the connecting accessories are used to limit the lifting position of the upper cross beam 2 relative to the column 1;

[0074] S13, the first connecting members between the cylinder body of the first main working cylinder 8 and the first side working cylinder 9 and the fixed beam 3 are removed, and the second connecting members between the plunger of the first main working cylinder 8 and the first side working cylinder 9 and the lower cross beam 4 are removed.

[0075] It should be noted that in step S11, the upper cross beam 2 is first driven to descend to a first height position by the lifting cylinder 5, thereby providing a suitable height position for the maintenance personnel to remove the connecting accessories of the closed frame, the first connecting members and the second connecting members. The first height position is the first height of the upper cross beam 2 from the ground, which can be 4600mm.

[0076] In step S12, the connecting accessories provided on the column 1 are removed, which not only removes the restrictions on the descending actions of the upper cross beam 2 and the working cylinders in the closed frame, but also provides convenience for the subsequent removal operation of the upper cross beam 2 from the column 1. The connecting accessories can include column limiting sleeves, which are provided on the column to limit the lifting position of the upper cross beam relative to the column. Two column limiting sleeves are provided on each column, and the upper cross beam is located between the two column limiting sleeves and can move up and down between the two column limiting sleeves. The first height position is located at a position between the two column limiting sleeves, and the second height position and the third height position are both lower than the height position of the column limiting sleeve located below.

[0077] In step S13, when the upper cross beam 2 is lowered to the first height position, since the upper cross beam 2 belongs to a part of the closed frame, the lower cross beam 4 of the closed frame is also lowered synchronously, at this time, the interval between the lower cross beam 4 and the fixed beam 3 just meets the maintenance work of the maintenance personnel, specifically, the maintenance personnel can manually remove the first connecting piece between the cylinder body of the two first main working cylinders 8 and the fixed beam 3 and the first connecting piece between the cylinder body of the first side working cylinder 9 and the fixed beam 3 on the lower cross beam 4, wherein the first connecting piece is used to connect the cylinder body of the working cylinder and the fixed beam 3, in other words, the first connecting piece is used to fasten the cylinder body on the fixed beam 3, and the first connecting piece can be a fixed bolt; the maintenance personnel can also manually remove the second connecting piece between the plunger of the two first main working cylinders 8 and the lower cross beam 4 and the second connecting piece between the plunger of the first side working cylinder 9 and the lower cross beam 4 on the lower cross beam 4, and the second connecting piece is used to connect the plunger of the working cylinder and the lower cross beam 4, in other words, the second connecting piece is used to fasten the plunger on the lower cross beam 4, and the second connecting piece can be a working cylinder plunger rocker pressure rod, so that after the first connecting piece and the second connecting piece are removed, the cylinder body of the first main working cylinder 8 and the first side working cylinder 9 is separated from the fixed beam 3, thereby preparing for the subsequent steps of the first main working cylinder 8 and the first side working cylinder 9 being separated from the fixed beam 3 and the hoisting operation. In this step, the removal sequence of the first connecting piece and the second connecting piece is not specifically limited.

[0078] In an embodiment of the present application, S1, the lowering of the upper cross beam 2 to different height positions by the lifting cylinder 5 to remove the connecting accessories of the closed frame, the first main working cylinder 8 and the first side working cylinder 9, the lengthening rod 6 and the main body member of the closed frame further comprises:

[0079] S14, adjusting the lowering of the upper cross beam 2 from the first height position to the second height position by the lifting cylinder 5;

[0080] S15, lifting the cylinder body of the first main working cylinder 8 and the first side working cylinder 9 by the jacking device to be higher than the fixed beam 3; and removing the lengthening rod 6 between the upper cross beam 2 and the lifting cylinder 5.

[0081] It should be noted that in step S14, the lowering of the upper cross beam 2 from the first height position to the second height position by the lifting cylinder 5 provides a suitable operation height for the lifting separation of the first main working cylinder 8 and the first side working cylinder 9 from the fixed beam 3 and the removal of the lengthening rod 6. The second height position is a second height of the upper cross beam 2 from the ground, which can be 3600 mm; the second height position is lower than the first height position.

[0082] In step S15, since the fixed beam 3 has four mounting holes for facilitating the fixation of the cylinder bodies of the four working cylinders, the four mounting holes limit the fixation of the four working cylinders, preventing tilting. Since in the above step S13, although the first connecting members of the cylinder bodies of the working cylinders and the fixed beam 3, and the second connecting members of the plungers of the working cylinders and the lower cross beam 4 are removed, the cylinder bodies of the working cylinders are not completely separated from the fixed beam, in other words, the cylinder bodies of the working cylinders can still be in frictional blockage or engagement with the fixed beam, when the upper cross beam 2 is lowered to the second height position, the first main working cylinder 8 and the first side working cylinder 9 can be jacked up by a jacking device (such as a jack), so that the cylinder body part structure of the first main working cylinder 8 and the first side working cylinder 9 is higher than the fixed beam 3, so that the cylinder bodies of the first main working cylinder 8 and the first side working cylinder 9 move relative to the fixed beam 3 to remove the possible frictional blockage or engagement, so as to facilitate the subsequent lowering movement of the first main working cylinder 8 and the first side working cylinder 9 with the lower cross beam, which not only ensures that the three working cylinders play a limiting and anti-tilting role during the subsequent stage of the falling of the closed frame, but also plays a guiding role for the subsequent hoisting of the three working cylinders away from the fixed beam 3.

[0083] In step S15, when the upper cross beam 2 is lowered to the second height position, since the lengthening rod 6 is located between the plunger of the lifting cylinder 5 and the upper cross beam 2, removing the lengthening rod 6 between the upper cross beam 2 and the lifting cylinder 5 can effectively avoid the interference of the lengthening rod 6 with the lowering action of the upper cross beam 2, thereby facilitating the subsequent lowering of the upper cross beam 2 to remove the three working cylinders and the main body member of the closed frame.

[0084] In an embodiment of the present application, S1, the upper cross beam 2 is driven to be lowered to different height positions by the lifting cylinder 5 to remove the connecting accessories of the closed frame, the first main working cylinder 8 and the first side working cylinder 9, the lengthening rod 6 and the main body member of the closed frame further comprises:

[0085] S16, a pad plate is arranged below the lower cross beam 4;

[0086] S17, the upper cross beam 2 is lowered from the second height position to a third height position by the lifting cylinder 5 to drive the lower cross beam 4 to fall onto the pad plate, at this time the first main working cylinder 8 and the first side working cylinder 9 fall onto the pad plate with the lower cross beam 4;

[0087] S110, the main body member of the closed frame is removed; the main body member includes the pull rod assembly 7, the upper cross beam 2 and the stand column 1.

[0088] It should be noted that, due to the high distance between the lower cross beam 4 and the bottom of the basement, the lower cross beam 4 cannot fall to the bottom of the basement, in order to facilitate the subsequent step of removing the main body member of the closed frame, the lower cross beam 4 needs to fall again by a certain height, so in step S16, a shim is provided below the lower cross beam 4, the shim is at the bottom of the basement, thereby providing vertical support for the subsequent step of falling again of the lower cross beam 4; wherein the number of shims is at least two, thereby supporting the closed frame and the plurality of working cylinders by contacting the lower cross beam 4.

[0089] Since in the above step S15, the lengthening rod 6 between the upper cross beam 2 and the lifting cylinder 5 has been removed, at this time the lifting end such as the piston rod of the lifting cylinder 5 can be directly in abutting or contacting relationship with the upper cross beam 2; in step S17, the upper cross beam 2 is adjusted by the lifting cylinder 5 to fall from the second height position to a third height position, to drive the lower cross beam 4 to fall onto the shim, in this process, the lifting end of the lifting cylinder 5 falls, so that the upper cross beam 2 can fall to the third height position under the action of its own gravity, and the lifting end of the lifting cylinder 5 can provide a certain support to the falling of the upper cross beam, to prevent the upper cross beam 2 from falling too fast, to ensure that the upper cross beam can stably and safely fall from the second height position to the third height position; and in the process of falling of the upper cross beam, the first main working cylinder 8 and the first side working cylinder 9 also fall with the lower cross beam 4 onto the shim, so that the shim provides vertical support to the lower cross beam 4 and the first main working cylinder 8 and the first side working cylinder 9, in other words, the lower cross beam 4 and the first main working cylinder 8 and the first side working cylinder 9 are no longer in the original suspended state of being installed on the fixed beam 3 due to the vertical support of the shim, thereby playing a safety role for the removal of the main body member of the closed frame and the hoisting of the first main working cylinder 8 and the first side working cylinder 9 in the subsequent step. Wherein, the third height position is a third height of the upper cross beam 2 from the ground, which can be 1900mm, after the upper cross beam 2 falls to the third height position, the disassembly of the upper cross beam 2 is more convenient, thereby facilitating the disassembly of the main body member of the closed frame. Figure 2 In the position of the fixed beam, double thin solid lines are drawn to mark the horizontal plane, to indicate the ground.

[0090] In step S110, disassembling the main body member of the closed frame means respectively removing the tie rod assembly 7, the upper cross beam 2 and the column 1 of the closed frame, thereby providing convenience for the hoisting of the first main working cylinder 8 and the first side working cylinder 9 away from the closed frame in the subsequent step, to avoid the main body member of the closed frame interfering with the hoisting of the three working cylinders.

[0091] Specifically, the nuts of the plurality of tie rod assemblies 7 of the two columns 1 are loosened first, so that the upper cross beam 2 and the lower cross beam 4 are released from the nuts, and the tie rod members in each column 1 also fall to the bottom of the basement due to the release of the nuts; since the nuts for limiting or connecting the upper cross beam 2 and the column 1 have been removed, the upper cross beam 2 can be lifted away from the column 1 by a large lifting device such as a 300-ton truck crane, thereby preparing for the removal of the tie rods and the column 1; then the plurality of tie rod members in the right column 1 in the middle right can be removed and lifted away from the column 1 by a lifting device such as a 25-ton truck crane, and the right column 1 can be removed by a large lifting device such as a 300-ton truck crane, and since Figure 2 the second side working cylinder 10 on the leftmost side does not need to be removed, the left column 1 does not need to be removed. Figure 2 Figure 2

[0092] In an embodiment of the present application, after the first main working cylinder 8 and the first side working cylinder 9 fall with the lower cross beam 4 to the base plate, S1, the upper cross beam 2 is driven to descend to a different height position by the lifting cylinder 5 to remove the connecting accessories of the closed frame, the first main working cylinder 8 and the first side working cylinder 9, the extension rod 6, and the main body member of the closed frame, further comprising:

[0093] S18, the first main working cylinder 8 and the first side working cylinder 9 are fixed by binding;

[0094] S19, the plunger of the second side working cylinder 10 is detached from the third connecting member of the lower cross beam 4, and the cylinder body and the plunger of the second side working cylinder 10 are fixed and hung on the fixed beam 3; wherein the working cylinder that does not need to be removed outside the space is the second side working cylinder 10.

[0095] It should be noted that in step S17, the upper cross beam 2 is adjusted by the lifting cylinder 5 to lower the lower cross beam 4 to a third height position, at which time Figure 2 ​​When the four cylinder bodies of the working cylinders are completely separated from the fixed beam 3, the first main working cylinder 8 and the first side working cylinder 9 are prone to tilting due to the absence of the limiting of the fixed beam 3, so in step S18, the first main working cylinder 8 and the first side working cylinder 9 are temporarily fixed to the body-side steel structure of the hydraulic machine by means of binding, so as to effectively prevent the first main working cylinder 8 and the first side working cylinder 9 from tilting, and also prepare for the hoisting operation of the first main working cylinder 8 and the first side working cylinder 9 in the subsequent steps. Specifically, the first main working cylinder 8 and the first side working cylinder 9 can be fixed to the body-side steel structure of the hydraulic machine by means of scaffold binding, so that the fixing mode of the first main working cylinder 8 and the first side working cylinder 9 is more secure, which not only prevents the working cylinders from tilting, but also provides convenience for the hoisting of the first main working cylinder 8 and the first side working cylinder 9 in the subsequent steps.

[0096] In step S17, the lifting cylinder 5 adjusts the upper cross beam 2 to drive the lower cross beam 4 to descend to the third height position, so that the distance between the fixed beam 3 and the lower cross beam 4 becomes larger. At this time, the plunger of the second side working cylinder 10 that does not need to be disassembled will exceed its stroke, in other words, when the upper cross beam 2 of the closed frame is lowered to the third height position, the plunger of the second side working cylinder 10 will also fall with the lower cross beam 4, which may cause the plunger of the second side working cylinder 10 to be separated from its cylinder body. Therefore, in step S19, the third connecting piece between the plunger of the second side working cylinder 10 and the lower cross beam 4 is disassembled, so that the plunger of the second side working cylinder 10 is separated from the limitation of the lower cross beam 4, thereby avoiding the plunger of the second side working cylinder 10 from being separated from its cylinder body, and effectively preventing the second side working cylinder 10 that does not need to be disassembled from malfunctioning. The third connecting piece can be a working cylinder plunger rocker pressure rod. In addition, after the third connecting piece is disassembled, the cylinder body and the plunger of the second side working cylinder 10 can be fixed as a whole and hung on the fixed beam 3, so as to effectively prevent the plunger of the second side working cylinder 10 from automatically falling and being separated from its cylinder body under the condition of its own gravity, thereby ensuring the safety of the second side working cylinder 10. Specifically, at least two connecting blocks can be used to fix the cylinder body and the plunger of the second side working cylinder 10 as a whole structure. Since the cylinder body of the second side working cylinder 10 is connected to the fixed beam 3 by means of fixing bolts, the second side working cylinder 10 is effectively prevented from being separated from the fixed beam 3.

[0097] In an embodiment of the present application, S2, transporting the first main working cylinder 8 and the first side working cylinder 9 to the maintenance destination comprises:

[0098] S21, laying a transportation track above the lower cross beam 4;

[0099] S22, placing a transport device on the transport track, hoisting the first main working cylinder 8 and the first side working cylinder 9 to the transport device, and transferring the first main working cylinder 8 and the first side working cylinder 9 to a maintenance destination by the transport device.

[0100] It should be noted that in step S21, the transport track is laid on the ground above the lower cross beam 4, thereby preparing for the transportation of the transport device in the subsequent steps.

[0101] In step S22, the transport device is placed on the transport track, and then the connection between the first main working cylinder 8 and the first side working cylinder 9 and the body side steel structure is sequentially released, so that the first main working cylinder 8 and the first side working cylinder 9 are separated from the body side steel structure and are in a free state. Then, the first main working cylinder 8 and the first side working cylinder 9 are sequentially lifted off the closed frame by the hoisting equipment such as the crown block through the mounting holes of the fixed beam 3 and are placed on the transport device, and then the first main working cylinder 8 and the first side working cylinder 9 are transferred to the maintenance destination by the transport device.

[0102] Specifically, the transport track can be an electric flat car track, and the transport device can be an electric flat car.

[0103] In an embodiment of the present application, S3, the assembled second main working cylinder and third side working cylinder are transferred to the working cylinder installation position, and the installation work is completed, which includes:

[0104] S31, transferring the assembled second main working cylinder and third side working cylinder by the transport device;

[0105] S32, hoisting the second main working cylinder and the third side working cylinder to the working cylinder installation position by the hoisting equipment, the installation position of the second main working cylinder being the position of the first main working cylinder before disassembly, and the installation position of the third side working cylinder being the position of the first side working cylinder before disassembly;

[0106] S33, assembling the first connecting piece between the cylinder body of the second main working cylinder and the third side working cylinder and the fixed beam 3, and assembling the second connecting piece between the plunger of the second main working cylinder and the third side working cylinder and the lower cross beam 4.

[0107] It should be noted that in step S31, the assembled second main working cylinder and third side working cylinder are transferred by the transport device; wherein the second main working cylinder and the third side working cylinder can refer to new second main working cylinders and third side working cylinders in normal working state, or can refer to the first main working cylinder 8 and the first side working cylinder 9 after maintenance.

[0108] In step S32, two second main working cylinders and one third side working cylinder are respectively hoisted to working cylinder installation positions by hoisting equipment such as a crown block, for example, hoisted into the working cylinder installation positions through the installation holes of the fixed beam 3. The installation position of the second main working cylinder is the position of the first main working cylinder 8 before disassembly, and the installation position of the third side working cylinder is the position of the first side working cylinder 9 before disassembly, in other words, the second main working cylinder replaces the original first main working cylinder 8, and the third side working cylinder replaces the original first side working cylinder 9.

[0109] In step S33, the cylinder body of the second main working cylinder is connected to the fixed beam 3 through a first connecting piece, and the cylinder body of the third side working cylinder is connected to the fixed beam 3 through another first connecting piece, so as to realize the assembly and fixation of the cylinder body of the second main working cylinder and the cylinder body of the third side working cylinder to the fixed beam 3. The plunger of the second main working cylinder is connected to the lower cross beam 4 through a second connecting piece, and the plunger of the third side working cylinder is connected to the lower cross beam 4 through another second connecting piece, so as to realize the assembly and fixation of the cylinder body of the second main working cylinder and the plunger of the third side working cylinder to the lower cross beam 4.

[0110] In an embodiment of the present application, S4, the reassembly of the closed frame, the two ends of the lengthening rod 6 are connected to the upper cross beam 2 and the lifting cylinder 5 respectively, includes:

[0111] S41, reassemble the main body component of the closed frame; wherein the main body component includes the pull rod assembly 7, the upper cross beam 2 and the stand column 1;

[0112] S42, drive the upper cross beam 2 to different height positions by the lifting cylinder 5 to assemble the lengthening rod 6 and the connecting accessories of the closed frame.

[0113] It should be noted that in step S41, the main body component of the closed frame is reassembled, so that after the assembly of the cylinder body of the second main working cylinder and the third side working cylinder is completed, the main body component is assembled, so that the frame of the hydraulic machine returns to a normal working state.

[0114] In step S42, the upper cross beam 2 is driven to different height positions by the lifting cylinder 5, so as to respectively install the lengthening rod 6 and the connecting accessories, so as to realize the connection of the plunger of the lifting cylinder 5 to the upper cross beam 2, and the connection limiting of the stand column 1 to the upper cross beam 2.

[0115] In an embodiment of the present application, S41, reassembling the main body component of the closed frame includes:

[0116] S411. The disassembled column 1 is lifted back by the first truck crane, and the tie rod of the tie rod assembly 7 is lifted back by the second truck crane, and the tie rod is installed inside the column 1.

[0117] S412. The upper crossbeam 2 is lifted back by the first truck crane and aligned with the tie rod.

[0118] S413. Connect the nut of the tie rod assembly 7 to the tie rod assembly to fasten the upper crossbeam 2 and the lower crossbeam 4 to the top and bottom of the column 1 respectively.

[0119] It should be noted that in step S411, a first mobile crane, such as a 300-ton mobile crane, can be used to... Figure 2 The previously removed right-side column 1 was hoisted back and reinstalled; a second truck crane, such as a 25-ton truck crane, was used to hoist the previously removed tie rod back to its original position. Figure 2 Inside the column 1 on the right side, thus preparing for the later connection of the upper crossbeam 2 and the lower crossbeam 4 to the two ends of the column 1 through the tie rod assembly 7.

[0120] In step S412, the previously removed upper crossbeam 2 can be lifted back by the first truck crane, and the upper crossbeam 2 can be aligned or aligned with the tie rods in the two columns 1 to install the upper crossbeam 2 in place.

[0121] In step S413, each tie rod in each column 1 can be connected by a nut. Each column 1 can have multiple tie rods installed, and at least one nut is installed at the upper and lower ends of each tie rod. The nuts at the upper ends of each column 1 can be tightened with a special tensioner according to a certain preload to fix the upper beam 2 to the top of the column 1 and the top of the tie rod. The nuts at the lower ends of each column 1 can be tightened with a special tensioner according to a certain preload to fix the lower beam 4 to the bottom of the column 1 and the bottom of the tie rod. This completes the fastening installation of the upper beam 2 and the lower beam 4 in the closed frame to the column 1 and the tie rods inside the column 1, respectively.

[0122] In one embodiment of the present invention, S42, the connection accessory for assembling the extension rod 6 and the closed frame by driving the upper crossbeam 2 to different height positions via the lifting cylinder 5 includes:

[0123] S421. Adjust the upper crossbeam 2 of the closed frame to the second height position by means of the lifting cylinder 5, and reassemble the extension rod 6 between the upper crossbeam 2 and the lifting cylinder 5;

[0124] S422, the upper beam 2 of the closed frame is adjusted to the first height position by the lifting cylinder 5, and the connecting accessory is reinstalled on the stand column 1.

[0125] It should be noted that in step S421, the upper beam 2 is adjusted to the second height position by the lifting cylinder 5, and at this time, the two ends of the extension rod 6 are connected to the upper beam 2 and the lifting cylinder 5 respectively, thereby completing the assembly work of the extension rod 6 between the upper beam 2 and the lifting cylinder 5.

[0126] In step S422, after the extension rod 6 between the upper beam 2 and the lifting cylinder 5 is assembled, the upper beam 2 is lifted to the first height position by the lifting cylinder 5 driving the extension rod 6, and at this time, the connecting accessory is installed on the stand column 1, thereby limiting the lifting position of the upper beam 2 relative to the stand column 1 by the connecting accessory.

[0127] After step S4, the following step S5 can also be included, which is to clean up the site and perform a trial movement on the hydraulic machine after maintenance to determine whether the working cylinder of the hydraulic machine returns to normal.

[0128] Although the present application is disclosed as above, the protection scope of the present application is not limited to this. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, and these changes and modifications will fall within the protection scope of the present application.

Claims

1. A hydraulic machine's working cylinder repair and replacement method, the hydraulic machine comprising a column (1), an upper beam (2), a fixed beam (3), a lower beam (4), working cylinders and a lifting cylinder (5), a plurality of the columns (1) arranged in parallel are respectively arranged in the upper beam (2), the fixed beam (3) and the lower beam (4) arranged in an up-down interval, a plurality of the working cylinders are arranged at intervals, the working cylinders in a space surrounded by a plurality of the columns (1) are first main working cylinders (8), the working cylinders to be removed outside the space are first side working cylinders (9), and the opposite ends of each of the working cylinders are connected to the fixed beam (3) and the lower beam (4) respectively, a pull rod assembly (7) is arranged in the column (1), and the upper and lower ends of the pull rod assembly (7) extending out of the column (1) are connected to the upper beam (2) and the lower beam (4) respectively and surround a closed frame, the lifting cylinder (5) is arranged on the fixed beam (3), and the lifting end of the lifting cylinder (5) is connected to the upper beam (2) through an extension rod (6); characterized in that The hydraulic machine's working cylinder repair and replacement method comprises the following steps: Lower the upper beam (2) to different height positions by the lifting cylinder (5) to remove the connecting accessories of the closed frame, the first main working cylinders (8) and the first side working cylinders (9), the extension rod (6) and the main body member of the closed frame; Transport the first main working cylinders (8) and the first side working cylinders (9) to a repair destination; Transport the assembled second main working cylinders and third side working cylinders to a working cylinder installation position and complete the installation work thereof; Reassemble the closed frame, and connect the two ends of the extension rod (6) to the upper beam (2) and the lifting cylinder (5) respectively.

2. The hydraulic cylinder repair method according to claim 1, wherein The step of lowering the upper beam (2) to different height positions by the lifting cylinder (5) to remove the connecting accessories of the closed frame, the first main working cylinders (8) and the first side working cylinders (9), the extension rod (6) and the main body member of the closed frame comprises: Adjust the upper beam (2) of the closed frame to a first height position by the lifting cylinder (5); Remove the connecting accessories of the closed frame from the column (1); wherein the connecting accessories comprise a column limiting sleeve, and the connecting accessories are used to limit the lifting position of the upper beam (2) relative to the column (1); Remove the first connecting members between the cylinder bodies of the first main working cylinders (8) and the first side working cylinders (9) and the fixed beam (3), and remove the second connecting members between the plungers of the first main working cylinders (8) and the first side working cylinders (9) and the lower beam (4).

3. The hydraulic cylinder repair method according to claim 2, wherein The step of lowering the upper beam (2) to different height positions by the lifting cylinder (5) to remove the connecting accessories of the closed frame, the first main working cylinders (8) and the first side working cylinders (9), the extension rod (6) and the main body member of the closed frame further comprises: Adjusting the upper cross beam (2) to descend from the first height position to the second height position by the lifting cylinder (5); Lifting the cylinder body of the first main working cylinder (8) and the first side working cylinder (9) by the jacking device to be higher than the fixed beam (3); disassembling the lengthened rod (6) between the upper cross beam (2) and the lifting cylinder (5).

4. The hydraulic cylinder repair method according to claim 3, wherein Driving the upper cross beam (2) to descend to different height positions by the lifting cylinder (5) to disassemble the connecting accessories of the closed frame, the first main working cylinder (8) and the first side working cylinder (9), the lengthened rod (6) and the main body member of the closed frame further comprise: Providing a cushion plate below the lower cross beam (4); Adjusting the upper cross beam (2) to descend from the second height position to the third height position by the lifting cylinder (5) to drive the lower cross beam (4) to fall onto the cushion plate, at this time the first main working cylinder (8) and the first side working cylinder (9) fall onto the cushion plate with the lower cross beam (4); Disassembling the main body member of the closed frame; the main body member comprises the pull rod assembly (7), the upper cross beam (2) and the column (1).

5. The hydraulic cylinder repair method according to claim 4, wherein After the first main working cylinder (8) and the first side working cylinder (9) fall onto the cushion plate with the lower cross beam (4), further comprising: Fixing the first main working cylinder (8) and the first side working cylinder (9) by binding; Disassembling the plunger of the second side working cylinder (10) and the third connecting piece of the lower cross beam (4), and fixing and suspending the cylinder body and the plunger of the second side working cylinder (10) to the fixed beam (3); wherein the working cylinder that does not need to be disassembled outside the space is the second side working cylinder (10).

6. The hydraulic cylinder repair method according to claim 1, wherein Transferring the first main working cylinder (8) and the first side working cylinder (9) to the maintenance destination comprises: Laying a transportation track above the lower cross beam (4); Placing a transportation device on the transportation track, hoisting the disassembled first main working cylinder (8) and the first side working cylinder (9) onto the transportation device, and transferring the first main working cylinder (8) and the first side working cylinder (9) to the maintenance destination by the transportation device.

7. The hydraulic cylinder repair method according to claim 1, wherein The transferring of the assembled second main working cylinder and third side working cylinder to the working cylinder installation position and completing the installation work thereof comprise: Transferring the assembled second main working cylinder and third side working cylinder by the transportation device; Hoisting the second main working cylinder and the third side working cylinder to the working cylinder installation position by the hoisting equipment, the installation position of the second main working cylinder is the position of the first main working cylinder (8) before disassembly, and the installation position of the third side working cylinder is the position of the first side working cylinder (9) before disassembly; Assembling the first connecting piece between the cylinder body of the second main working cylinder and the third side working cylinder and the fixed beam (3), and assembling the second connecting piece between the plunger of the second main working cylinder and the third side working cylinder and the lower cross beam (4).

8. The hydraulic cylinder repair method according to claim 3, wherein The reassembling the closed frame, connecting two ends of the lengthened rod (6) to the upper crossbeam (2) and the lifting cylinder (5) respectively comprises: Reassembling the main body member of the closed frame; wherein the main body member comprises the pull rod assembly (7), the upper crossbeam (2) and the stand column (1); Driving the upper crossbeam (2) to rise to different height positions by the lifting cylinder (5) to assemble the connecting accessories of the lengthened rod (6) and the closed frame.

9. The hydraulic cylinder repair method according to claim 8, wherein Reassembling the main body member of the closed frame comprises: Lifting the disassembled stand column (1) by a first automobile crane, lifting the pull rod piece of the pull rod assembly (7) by a second automobile crane, and setting the pull rod piece in the stand column (1); Lifting the upper crossbeam (2) by the first automobile crane, and aligning the upper crossbeam (2) with the pull rod piece; Connecting the nut piece of the pull rod assembly (7) to the pull rod piece to fasten the upper crossbeam (2) and the lower crossbeam (4) to the top end and the bottom end of the stand column (1) respectively.

10. The hydraulic cylinder repair method according to claim 8, wherein The driving the upper crossbeam (2) to rise to different height positions by the lifting cylinder (5) to assemble the connecting accessories of the lengthened rod (6) and the closed frame comprises: Adjusting the upper crossbeam (2) of the closed frame to rise to the second height position by the lifting cylinder (5) to reassemble the lengthened rod (6) between the upper crossbeam (2) and the lifting cylinder (5); Adjusting the upper crossbeam (2) of the closed frame to rise to the first height position by the lifting cylinder (5) to reinstall the connecting accessories on the stand column (1).

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