CN116771756A - Method for maintaining and replacing working cylinder of hydraulic machine - Google Patents

Abstract

The invention relates to the technical field of maintenance of parts of hydraulic presses, and provides a method for maintaining and replacing a working cylinder of a hydraulic press, which comprises the following steps: the method comprises the following steps: the upper cross beam is driven to descend to different height positions through the lifting cylinder so as to remove the connecting accessories of the closed frame, the first main working cylinder, the first side working cylinder, the lengthening bar and the main body component of the closed frame; transferring the first master cylinder and the first side cylinder to a repair destination; transferring the assembled second main working cylinder and third side working cylinder to the working cylinder mounting position, and completing the mounting work; and (3) reassembling the closed frame, and respectively connecting the two ends of the extension rod with the upper cross beam and the lifting cylinder. The invention completes the dismantling and replacing operation of the fault working cylinder in the narrow closed frame through the steps, and has smoother and more convenient operation and higher maintenance efficiency of the fault working cylinder.

Description

Method for maintaining and replacing working cylinder of hydraulic machine

Technical Field

The invention relates to the technical field of maintenance of parts of hydraulic presses, in particular to a method for maintaining and replacing a working cylinder of a hydraulic press.

Background

Hydraulic presses, such as three-beam double-column drop-down hydraulic presses, are mainly used for pressing processes of metal materials, such as stamping, bending, forming, backlog, sheet stretching, pressing and forming of powder products thereof, and the like, and also can be used for hot pressing and forming processes of plastic products. The three-beam double-column drop-down hydraulic press mainly comprises two columns, an upper beam, a fixed beam, a lower beam, working cylinders, lifting cylinders and other auxiliary parts, wherein the two columns are vertically arranged at intervals, a pull rod assembly is arranged in each column, the upper end and the lower end of each pull rod assembly extending out of each column are respectively connected with the upper beam and the lower beam and form a closed frame in a surrounding mode, the cylinder bodies of the four working cylinders and the cylinder bodies of one lifting cylinder are arranged in the fixed beam, the part of the structure of the fixed beam is located in a basement below the ground, each working cylinder below the fixed beam and the lower beam are located in the basement, the plungers of the four working cylinders face downwards to be connected with the lower beam, the plungers of the lifting cylinders face upwards to be connected with the upper beam through extension rods, and the working cylinders and the lifting cylinders are matched for operation to drive the whole closed frame to move in a lifting mode.

However, when the working cylinders fail, for example, a maintenance person enters the basement first and then enters the closed frame, so that the part of the working cylinders which are easy to fail due to high use frequency is removed, but because each working cylinder is located in a narrow area of the basement in the closed frame, the closed frame with a narrow space interferes with and is inconvenient to remove and replace the failed working cylinder, and further the maintenance efficiency of the failed working cylinder is affected.

Disclosure of Invention

The invention solves the problem of how to improve the maintenance efficiency of a working cylinder in a narrow closed frame.

In order to solve the problems, the invention provides a method for maintaining and replacing a working cylinder of a hydraulic machine, the hydraulic machine comprises upright posts, an upper cross beam, a fixed beam, a lower cross beam, a working cylinder and lifting cylinders, wherein a plurality of upright posts which are arranged in parallel penetrate through the upper cross beam, the fixed beam and the lower cross beam which are arranged at intervals up and down respectively, the working cylinders are arranged at intervals, the working cylinder which is located in a space surrounded by the upright posts is a first main working cylinder, the working cylinder which is located outside the space and is to be removed is a first side working cylinder, the opposite ends of each working cylinder are respectively connected with the fixed beam and the lower cross beam, a pull rod assembly is arranged in the upright posts, the upper end and the lower end of each pull rod assembly which extends out of the upright posts are respectively connected with the upper cross beam and the lower cross beam and are surrounded into a closed frame, the lifting cylinder is arranged on the fixed beam, and the lifting end of the lifting cylinder is connected with the upper cross beam through a lengthening rod;

the method for maintaining and replacing the working cylinder of the hydraulic machine comprises the following steps:

the upper cross beam is driven to descend to different height positions through the lifting cylinder so as to remove the connecting accessories of the closed frame, the first main working cylinder, the first side working cylinder, the lengthening bar and the main body component of the closed frame;

Transferring the first master cylinder and the first side cylinder to a repair destination;

transferring the assembled second main working cylinder and third side working cylinder to the working cylinder mounting position, and completing the mounting work;

and reassembling the closed frame, and respectively connecting the two ends of the extension rod with the upper cross beam and the lifting cylinder.

Optionally, the driving the upper beam to descend to different height positions by the lifting cylinder to remove the connection attachments of the closed frame, the first main cylinder and the first side cylinder, the extension bar, and the body member of the closed frame includes:

the upper cross beam of the closed frame is adjusted to descend to a first height position through the lifting cylinder;

detaching the connection accessory of the closed frame from the upright; the connecting accessory comprises an upright post limiting sleeve, and is used for limiting the lifting position of the upper cross beam relative to the upright post.

The cylinder body of the first main working cylinder, the first connecting piece between the cylinder body of the first side working cylinder and the fixed beam, and the second connecting piece between the plunger of the first main working cylinder, the plunger of the first side working cylinder and the lower beam are disassembled.

Optionally, the driving the upper beam to descend to different height positions by the lifting cylinder to remove the connection accessory of the closed frame, the first main cylinder and the first side cylinder, the extension bar, and the main body member of the closed frame further include:

the lifting cylinder is used for adjusting the upper cross beam to descend from the first height position to the second height position;

jacking the cylinder bodies of the first main working cylinder and the first side working cylinder through a jacking device so as to be higher than the fixed beam; and disassembling the extension rod between the upper cross beam and the lifting cylinder.

Optionally, the upper beam is driven to descend to different height positions by the lifting cylinder to remove the connection attachment of the closed frame, the first main cylinder and the first side cylinder, the extension bar, and the main body member of the closed frame further include:

a backing plate is arranged below the lower cross beam;

the lifting cylinder is used for adjusting the upper beam to descend from the second height position to the third height position so as to drive the lower beam to descend onto the base plate, and at the moment, the first main working cylinder and the first side working cylinder descend onto the base plate along with the lower beam;

Detaching a body member of the enclosure frame; the body member includes the tie rod assembly, an upper cross member, and the upright.

Optionally, after the first main cylinder and the first side cylinder drop onto the pad plate with the lower cross member, the hydraulic actuator further includes:

fixing the first main working cylinder and the first side working cylinder in a binding mode;

disassembling a third connecting piece of a plunger of the second side working cylinder and the lower cross beam, and fixing and suspending a cylinder body and the plunger of the second side working cylinder on the fixed beam; wherein the working cylinder which is outside the space and does not need to be dismantled is a second side working cylinder.

Optionally, transferring the first master cylinder and the first side cylinder to a repair destination includes:

a transportation rail is laid above the lower cross beam;

and placing a conveying device on the conveying track, hoisting the disassembled first main working cylinder and first side working cylinder onto the conveying device, and transferring the first main working cylinder and the first side working cylinder to a maintenance destination through the conveying device.

Optionally, transferring the assembled second main cylinder and third side cylinder to the mounting position of the cylinders and completing the mounting thereof includes:

Transferring the assembled second main working cylinder and third side working cylinder through a conveying device;

hoisting the second main working cylinder and the third side working cylinder to the mounting position of the working cylinder through hoisting equipment, wherein the mounting position of the second main working cylinder is the position of the first main working cylinder before dismantling, and the mounting position of the third side working cylinder is the position of the first side working cylinder before dismantling;

and assembling a first connecting piece between the cylinder body of the second main working cylinder and the cylinder body of the third side working cylinder and the fixed beam, and assembling a second connecting piece between the plunger of the second main working cylinder and the plunger of the third side working cylinder and the lower cross beam.

Optionally, the reassembling the closed frame, connecting the two ends of the extension bar to the upper beam and the lifting cylinder respectively includes:

reassembling the body member of the enclosure frame; wherein the main body member comprises the pull rod assembly, an upper cross beam and the upright post;

the lifting cylinder drives the upper cross beam to be lifted to different height positions so as to assemble the extension rod and the connecting accessory of the closed frame.

Optionally, reassembling the body member of the enclosure frame includes:

The detached upright post is hung back through a first automobile crane, a pull rod piece of the pull rod assembly is hung back through a second automobile crane, and the pull rod piece is arranged in the upright post;

the upper cross beam is hung back through the first automobile crane, and the upper cross beam is aligned with the pull rod piece;

and connecting the nut piece of the pull rod assembly with the pull rod piece so as to fasten the upper cross beam and the lower cross beam at the top end and the bottom end of the upright respectively.

Optionally, the driving the upper beam to rise to different height positions by the lifting cylinder to assemble the extension bar and the connection accessory of the closed frame comprises:

adjusting the upper beam of the closed frame to the second height position by the lifting cylinder, and reassembling the extension rod between the upper beam and the lifting cylinder;

and the upper cross beam of the closed frame is adjusted to be lifted to the first height position through the lifting cylinder, and the connecting accessory is reinstalled on the upright post.

Compared with the prior art, the hydraulic press at least comprises the upright post, the upper cross beam, the lower cross beam, the first main working cylinder, the first side working cylinder and the second side working cylinder, wherein the upper end and the lower end of the pull rod assembly extending out of the upright post are respectively connected with the upper cross beam and the lower cross beam and are enclosed into a closed frame; the first main working cylinder and the first side working cylinder are used frequently, and are relatively easy to generate faults.

When the first main working cylinder and the first side working cylinder are in fault and need to be maintained and replaced, the connecting accessory of the closed frame can be removed firstly, wherein the connecting accessory can comprise a stand column limiting sleeve, the connecting accessory is arranged on the stand column and used for limiting the lifting position of the upper cross beam relative to the stand column, and the connecting accessory is removed, so that the limitation on the descending actions of the upper cross beam and each working cylinder in the closed frame can be removed, and convenience can be provided for the subsequent removal operation that the upper cross beam is separated from the stand column upwards; when the upper cross beam descends to different height positions, maintenance personnel can conveniently dismantle the first main working cylinder, the first side working cylinder and the extension bar arranged between the lifting end of the lifting cylinder and the upper cross beam at proper height positions, so that the extension bar can be dismantled to avoid interference to the descending of the upper cross beam. The connecting accessories and the extension bars of the closed frame are removed, so that the preparation is made for the disassembly action of the main body member of the closed frame, and then the main body member of the closed frame is disassembled, and the disassembly of the main body member of the closed frame is convenient for the hoisting and transferring processes of the first main working cylinder and the first side working cylinder in the follow-up steps.

After the main body member of the disassembly closing frame is removed, the first main cylinder and the first side cylinder which have failed and have been disassembled are transported to a maintenance destination to leave an installation space for new second main cylinder and third side cylinder in the subsequent step.

Transferring the assembled second main working cylinder and third side working cylinder to the working cylinder mounting position, and completing the mounting work of the second main working cylinder and third side working cylinder; wherein the assembled second main cylinder and third side cylinder refer to the normal second main cylinder and third side cylinder, or the first main cylinder and first side cylinder after maintenance.

Finally, the closed frame is reassembled, and the two ends of the extension bar are respectively connected with the upper cross beam and the lifting cylinder, so that the extension bar is assembled.

In summary, the invention completes the dismantling and replacing operation of the fault working cylinder in the narrow closed frame through the steps, and has smoother and more convenient operation and higher maintenance efficiency of the fault working cylinder.

Drawings

FIG. 1 is a flow chart of a method of cylinder repair and replacement for a hydraulic machine in accordance with an embodiment of the present invention;

Fig. 2 is a schematic structural diagram of a hydraulic machine according to an embodiment of the present invention.

Reference numerals illustrate:

1-stand columns; 2-an upper cross beam; 3-fixing the beam; 4-a lower cross beam; 5-lifting cylinders; 6, lengthening the bar; 7-a tie rod assembly; 8-a first main working cylinder; 9-a first side working cylinder; 10-second side cylinder.

Detailed Description

In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.

In the coordinate system XZ provided herein, the positive direction of the X axis represents the right direction, the negative direction of the X axis represents the left direction, the positive direction of the Z axis represents the upper direction, and the negative direction of the Z axis represents the lower direction. Also, it is noted that the terms "first," "second," and the like in the description and claims of the present invention and in the above-described figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein.

In the description of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be a mechanical connection; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

In the description of the present specification, the descriptions of the terms "embodiment," "one embodiment," and the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or embodiment is included in at least one embodiment or implementation of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same examples or implementations. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or implementations.

Referring to fig. 2, the embodiment of the present invention provides a hydraulic press, which includes an upright 1, an upper beam 2, a fixed beam 3, a lower beam 4, a working cylinder and a lifting cylinder 5, where a plurality of upright 1 disposed in parallel are respectively disposed in a penetrating manner on the upper beam 2, the fixed beam 3 and the lower beam 4 disposed at an upper-lower interval, a plurality of working cylinders are disposed at intervals, the working cylinder located within a space defined by the plurality of upright 1 is a first main working cylinder 8, the working cylinder to be removed outside the space is a first side working cylinder 9, the working cylinder located outside the space is not required to be removed and is a second side working cylinder 10, opposite ends of each working cylinder are respectively connected to the fixed beam 3 and the lower beam 4, a pull rod assembly 7 is disposed in the upright 1, the upper end and the lower end of the pull rod assembly 7 extending out of the upright 1 are respectively connected to the upper beam 2 and the lower beam 4 and enclose a closed frame, the lifting cylinder 5 is disposed on the fixed beam 3, and the lifting end of the lifting cylinder 5 is connected to the upper beam 2 via a lifting rod 6.

It should be noted that the hydraulic machine of the present invention is not limited to the three-beam double-column drop-down hydraulic machine, but may be another type of hydraulic machine, such as a three-beam four-column hydraulic machine, and the like, and is not particularly limited herein.

The columns 1 are horizontally arranged at intervals along the X-axis direction of the coordinate system of FIG. 2, the upper cross beam 2, the fixed beam 3 and the lower cross beam 4 are vertically arranged at intervals along the Z-axis direction of the coordinate system of FIG. 2, a small part of the fixed beam 3 is above the ground, a large part of the fixed beam 3 is below the ground, the four cylinders are connected with the fixed beam 3, and the plungers of the four cylinders are downward to be connected with the lower cross beam 4, so that the four cylinders are also below the ground.

Taking the hydraulic machine structure shown in fig. 2 as an example for explanation, the number of working cylinders is four, the number of upright posts 1 is two, the two upright posts 1 are arranged at intervals and can form a space between them, and the two working cylinders in the space are defined as first main working cylinders 8, so the number of the first main working cylinders 8 is two; a working cylinder outside the space enclosed by the two upright posts 1, for example, on the left side, has low use frequency and low failure rate, does not need to be disassembled, and can be defined as a second side working cylinder 10; a working cylinder outside the space enclosed by the two uprights 1, for example on the right side, is used with a high frequency and a high failure rate, and needs to be dismantled, and can be defined as a first side working cylinder 9.

At least one pull rod assembly 7 is arranged in each upright 1, the pull rod assembly 7 comprises a pull rod piece and a nut piece, the upper end of the pull rod piece extends out of the upright 1 and is connected with the upper cross beam 2 through the nut piece, the lower end of the pull rod piece extends out of the upright 1 and is connected with the lower cross beam 4 through the nut piece, so that the two uprights 1 can be respectively connected with the upper cross beam 2 and the lower cross beam 4 through the pull rod assembly 7 to form a closed frame, at the moment, two first main working cylinders 8 of the four working cylinders are all positioned in the closed frame, and two first side working cylinders 9 are positioned 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 piston of the lifting cylinder 5 can be connected with the upper beam 2 through the extension rod 6, the upper beam 2 is driven by the lifting cylinder 5, the lower beam 4 is simultaneously driven by the four working cylinders, and the upper beam 2 and the lower beam 4 are linked through the pull rod assembly 7, so that the whole closed frame can be driven to move up and down.

In order to solve the technical problems, as shown in fig. 1, the method for repairing and replacing the working cylinder of the hydraulic machine comprises the following steps:

s1, driving the upper cross beam 2 to descend to different height positions through the lifting cylinder 5 so as to remove the connecting accessories of the closed frame, the first main working cylinder 8, the first side working cylinder 9, the extension rod 6 and the main body member of the closed frame;

S2, transferring the first main working cylinder 8 and the first side working cylinder 9 to a maintenance destination;

s3, transferring the assembled second main working cylinder and third side working cylinder to a working cylinder mounting position, and completing the mounting work;

s4, reassembling the closed frame, and respectively connecting the two ends of the extension rod 6 with the upper cross beam 2 and the lifting cylinder 5.

It should be noted that, in step S1, when two first main working cylinders 8 and first side working cylinders 9 fail and need to be maintained and replaced, the connection accessory of the closed frame may be removed first, where the connection accessory on each upright 1 includes two upright limiting sleeves, where the two upright limiting sleeves are disposed on the upright 1 at an upper-lower interval and are used to limit the lifting position of the upper beam 2 relative to the upright 1, in other words, the two upright limiting sleeves disposed at an upper-lower interval may play an upper limiting role and a lower limiting role on the upper beam 2, and the connection accessory removal may not only remove the limitation for the lowering actions of the upper beam 2 and each working cylinder in the closed frame, but also may provide convenience for the subsequent removal operation that the upper beam 2 is separated from the upright 1 upwards; in addition, the first main working cylinder and the first side working cylinder are removed when the upper beam 2 descends to the set height position, so that the first side working cylinder can be conveniently detached at the proper height position by a maintainer, and the operation is convenient; furthermore, after the upper beam 2 descends to a certain height, the extension bar 6 between the lifting end of the lifting cylinder 5 and the upper beam 2 is removed, so that the interference of the extension bar 6 on the descending action of the upper beam 2 can be avoided, and the upper beam 2 can continue to descend so as to facilitate the follow-up removal action. Finally, the attachment of the closing frame and the extension bar 6 are removed, thus preparing for the removal of the body member of the closing frame, which in turn facilitates the lifting and transfer of the first main cylinder 8 and the first side cylinder 9 in a subsequent step, and subsequently removing the body member of the closing frame.

In step S2, after the main body member of the closed frame is disassembled, the first main cylinder 8 and the first side cylinder 9 which have failed and have been disassembled are transported to a maintenance destination to leave an installation space for new second main cylinder and third side cylinder in the subsequent step.

In step S3, transferring the assembled second main cylinder and third side cylinder to cylinder mounting positions, and completing the mounting work of the second main cylinder and third side cylinder; wherein the assembled second main cylinder and third side cylinder refer to the normal second main cylinder and third side cylinder, or the first main cylinder 8 and the first side cylinder 9 after maintenance.

In step S4, the closed frame is reassembled and both ends of the extension bar 6 are connected to the upper beam 2 and the lift cylinder 5, respectively, thereby completing the assembly of the extension bar 6.

In summary, the invention completes the dismantling and replacing operation of the fault working cylinder in the narrow closed frame through the steps, and has smoother and more convenient operation and higher maintenance efficiency of the fault working cylinder.

In one embodiment of the invention, S1, said driving of said upper cross beam 2 by said lifting cylinders 5 to different height positions for removing the connection attachments of said closed frame, said first main cylinder 8 and said first side cylinder 9, said extension bar 6 and the body members of said closed frame comprise:

S11, adjusting the upper cross beam 2 of the closed frame to descend to a first height position through the lifting cylinder 5;

s12, detaching the connection accessory of the closed frame from the upright 1; wherein the connecting accessory is used for limiting the lifting position of the upper cross beam 2 relative to the upright post 1;

s13, disassembling a first connecting piece between the cylinder body of the first main working cylinder 8 and the cylinder body of the first side working cylinder 9 and the fixed beam 3, and disassembling a second connecting piece between the plunger of the first main working cylinder 8 and the plunger of the first side working cylinder 9 and the lower beam 4.

In step S11, the lifting cylinder 5 drives the upper beam 2 to first descend to the first height position, so as to provide a suitable height position for the maintenance personnel to detach the connection accessory, the first connection member and the second connection member of the closed frame. The first height position is the first height of the upper beam 2 from the ground, which can be 4600mm.

In step S12, the connection accessory provided on the upright 1 is removed, which not only can remove the restriction on the descending actions of the upper beam 2 and each working cylinder in the closed frame, but also can facilitate the subsequent removal operation that the upper beam 2 is separated from the upright 1 upward. The connecting accessory can comprise upright post limiting sleeves, and is arranged on the upright posts and used for limiting the lifting position of the upper cross beam relative to the upright posts, wherein two upright post limiting sleeves are arranged on each upright post at intervals, the upper cross beam is positioned between the two upright post limiting sleeves, and the upper cross beam can move up and down at the position between the upper upright post limiting sleeves and the lower upright post limiting sleeves. And the first height position is positioned at a certain position between the two upright post limiting sleeves, and the second height position and the third height position are lower than the height position of the upright post limiting sleeve positioned below.

In step S13, when the upper cross member 2 is lowered to the first height position, since the upper cross member 2 is a part of the closed frame, the lower cross member 4 of the closed frame is also lowered simultaneously, and the space between the lower cross member 4 and the fixed beam 3 is just enough for the maintenance work of the maintenance personnel, specifically, the maintenance personnel can manually remove the first connecting members between the cylinders of the two first main cylinders 8 and the fixed beam 3, and the first connecting members between the cylinders of the one first side cylinder 9 and the fixed beam 3, respectively, on the lower cross member 4, wherein the first connecting members are used for connecting the cylinders of the cylinders and the fixed beam 3, in other words, the first connecting members are used for fastening the cylinders to the fixed beam 3, and the first connecting members can be fixing bolts; the maintenance personnel can also manually remove the second connection between the plungers of the two first main cylinders 8 and the lower beam 4, respectively, and the second connection between the plungers of the one first side cylinder 9 and the lower beam 4, respectively, on the lower beam 4, while the second connection is used for connecting the plungers of the cylinders with the lower beam 4, in other words, the second connection is used for fastening the plungers to the lower beam 4, and the second connection can be a plunger rocker flange of the cylinder, so that after the first connection and the second connection are removed, the condition of separation is provided between the cylinders of the first main cylinder 8 and the first side cylinder 9 and the fixed beam 3, respectively, so as to prepare for the detachment of the first main cylinder 8 and the first side cylinder 9 from the fixed beam 3 and the hoisting operation in the subsequent steps. In this step, the removal sequence of the first connector and the second connector is not particularly limited.

In one embodiment of the invention, S1, said driving of said upper cross beam 2 by said lifting cylinders 5 to different height positions for removing the connection attachments of said closed frame, said first main cylinder 8 and said first side cylinder 9, said extension bar 6 and the body member of said closed frame further comprises:

s14, adjusting the upper beam 2 to descend from the first height position to a second height position through the lifting cylinder 5;

s15, lifting the cylinder bodies of the first main working cylinder 8 and the first side working cylinder 9 through a lifting device so as to be higher than the fixed beam 3; the extension bar 6 between the upper cross beam 2 and the lifting cylinder 5 is detached.

In step S14, the lifting cylinder 5 is used to adjust the upper beam 2 to descend from the first height position to the second height position, so as to provide a suitable operation height for the lifting and separating action of the first main cylinder 8 and the first side cylinder 9 from the fixed beam 3 and the removing action of the extension bar 6, respectively. Wherein the second height position is the second height of the upper cross beam 2 from the ground, which can be 3600mm; the second height position is lower than the first height position.

In step S15, since the fixing beam 3 has four mounting holes for facilitating the fixation of the cylinder bodies of the four cylinders, the four mounting holes restrict the fixation of the four cylinders, preventing toppling. Since in the above step S13, although the first connecting piece between the cylinder body of each working cylinder and the fixed beam 3 and the second connecting piece between the plunger of each working cylinder and the lower beam 4 are removed, the cylinder body of each working cylinder is not completely capable of being separated from the fixed beam, in other words, the cylinder body of each working cylinder may still have friction blocking or engagement with the fixed beam, when the upper beam 2 is lowered to the second height position, the first main working cylinder 8 and the first side working cylinder 9 may be lifted by a lifting device (such as a jack) so that the cylinder body part structures of the first main working cylinder 8 and the first side working cylinder 9 are raised above the fixed beam 3, so that the relative movement between the cylinder bodies of the first main working cylinder 8 and the first side working cylinder 9 and the fixed beam 3 is generated to release the possible friction blocking or engagement, etc., so that the first main working cylinder 8 and the first side working cylinder 9 are ready for the lowering movement of the lower beam in the subsequent steps, so that the three subsequent lifting steps can be prevented from falling down to the fixed beam 3.

In step S15, when the upper beam 2 descends to the second height position, since the extension bar 6 is located between the plunger of the lifting cylinder 5 and the upper beam 2, the extension bar 6 between the upper beam 2 and the lifting cylinder 5 is detached, so that interference of the extension bar 6 on the descending motion of the upper beam 2 can be effectively avoided, and convenience is provided for the next descent of the upper beam 2 in the subsequent step to detach the three working cylinders and the main body member of the closed frame.

In one embodiment of the invention, S1, driving the upper beam 2 to descend to different height positions by the lifting cylinder 5 to remove the connection attachments of the closed frame, the first main cylinder 8 and the first side cylinder 9, the extension bar 6 and the main body member of the closed frame further comprise:

s16, setting a backing plate below the lower cross beam 4;

s17, the upper beam 2 is adjusted to descend from the second height position to a third height position through the lifting cylinder 5 so as to drive the lower beam 4 to descend onto the base plate, and at the moment, the first main working cylinder 8 and the first side working cylinder 9 descend onto the base plate along with the lower beam 4;

s110, detaching a main body member of the closed frame; the main body member comprises the pull rod assembly 7, an upper cross beam 2 and the upright 1.

It should be noted that, because the distance between the lower beam 4 and the bottom of the basement is relatively high, the lower beam 4 cannot fall to the bottom of the basement, and in order to facilitate the detachment of the main body member of the closed frame in the subsequent step, the lower beam 4 needs to fall to a certain height again, so in step S16, a pad is disposed below the lower beam 4, and the pad is located at the bottom of the basement, so as to provide vertical support for the re-falling of the lower beam 4 in the subsequent step; wherein the number of pads is at least two, so as to act as a support for the closed frame and the plurality of working cylinders by contacting the lower cross beam 4.

Since the extension bar 6 between the upper beam 2 and the lifting cylinder 5 has been removed in the above-mentioned step S15, the lifting end of the lifting cylinder 5, e.g. the piston rod, may then be in direct abutting or contacting relationship with the upper beam 2; in step S17, the lifting cylinder 5 is used to adjust the upper beam 2 to descend from the second height position to the third height position, so as to drive the lower beam 4 to descend onto the backing plate, in this process, the lifting end of the lifting cylinder 5 descends, so that the upper beam 2 can descend to the third height position under the action of self gravity, and the lifting end of the lifting cylinder 5 can generate a certain supporting effect on the descent of the upper beam, so as to prevent the upper beam 2 from descending too fast, and ensure that the upper beam can stably and safely descend from the second height position to the third height position; and during the lowering of the upper cross beam, the first main cylinder 8 and the first side cylinder 9 also drop onto the backing plate along with the lower cross beam 4, so that the backing plate plays a role in providing vertical support for the lower cross beam 4 and the first main cylinder 8 and the first side cylinder 9, in other words, the lower cross beam 4 and the first main cylinder 8 and the first side cylinder 9 are not in a suspended state originally mounted on the fixed beam 3 due to the vertical support of the backing plate, thereby playing a safety role for the dismantling of the main body member of the closed frame and the lifting of the first main cylinder 8 and the first side cylinder 9 in the subsequent steps. The third height position is a third height of the upper beam 2 from the ground, which may be 1900mm, and the upper beam 2 can be more conveniently detached after being lowered to the third height position, thereby being beneficial to the detachment of the main body member of the closed frame. In fig. 2, double thin solid lines are drawn at the position of the fixed beam, marking the horizontal plane to indicate the ground.

In step S110, the main body member of the closed frame is detached, which means that the pull rod assembly 7, the upper beam 2 and the upright 1 of the closed frame are detached respectively, so as to facilitate the hoisting of the first main working cylinder 8 and the first side working cylinder 9 in the subsequent step to separate from the closed frame, and avoid the interference of the main body member of the closed frame to the hoisting of the three working cylinders.

Specifically, the nut members of the plurality of pull rod assemblies 7 on the two upright posts 1 can be loosened firstly, so that the upper cross beam 2 and the lower cross beam 4 are separated from the limit of the nut members, and at the moment, the pull rod members in the upright posts 1 also lose the limit of the nut members and fall to the bottom of the basement; since the nut members for restraining or connecting the upper beam 2 with the column 1 have been removed, the upper beam 2 can be lifted off the column 1 by a large lifting device such as a 300 ton truck crane, thereby preparing for the removal of the tie rod and column 1; the plurality of tie rods in the right column 1 in fig. 2 can then be removed and lifted off the column 1 by means of a lifting device, for example a 25-ton truck crane, and the right column 1 can be removed by means of a large lifting device, for example a 300-ton truck crane, without the left column 1 in fig. 2 being removed, since the leftmost second working cylinder 10 in fig. 2 is not removed.

In one embodiment of the invention, after the first main cylinder 8 and the first side cylinder 9 drop onto the pad with the lower beam 4, S1, driving the upper beam 2 to a different height position by the lifting cylinder 5 to remove the attachment of the closing frame, the first main cylinder 8 and the first side cylinder 9, the extension bar 6 and the body member of the closing frame further comprise:

s18, fixing the first main working cylinder 8 and the first side working cylinder 9 in a binding mode;

s19, disassembling a third connecting piece of the plunger of the second side working cylinder 10 and the lower cross beam 4, and fixing and suspending the cylinder body and the plunger of the second side working cylinder 10 on the fixed beam 3; wherein the cylinder outside the space that does not need to be removed is the second side cylinder 10.

It should be noted that, in step S17, since the lifting cylinder 5 adjusts the upper beam 2 to drive the lower beam 4 to descend to the third height position, the cylinders of the four cylinders in fig. 2 are completely separated from the fixed beam 3, and the first main cylinder 8 and the first side cylinder 9 easily fall due to the loss of the limit of the fixed beam 3, in step S18, the first main cylinder 8 and the first side cylinder 9 may be temporarily fixed on the machine body side steel structure of the hydraulic machine in a binding manner, so as to effectively prevent the first main cylinder 8 and the first side cylinder 9 from falling, and prepare for the hoisting operation of the first main cylinder 8 and the first side cylinder 9 in the subsequent steps. Specifically, the first main working cylinder 8 and the first side working cylinder 9 can be fixed on the machine body side steel structure of the hydraulic machine in a scaffold binding mode, so that the fixing mode of the first main working cylinder 8 and the first side working cylinder 9 is firmer, the side turning of the working cylinder is prevented, and convenience is provided for hoisting the first main working cylinder 8 and the first side working cylinder 9 in the subsequent steps.

Since in step S17, the lifting cylinder 5 adjusts the upper beam 2 to drive the lower beam 4 to descend to the third height position, so that the distance between the fixed beam 3 and the lower beam 4 becomes larger, the plunger of the second side working cylinder 10 that is not required to be disassembled at this time will exceed the self travel, in other words, when the upper beam 2 of the closed frame descends to the third height position, the plunger of the second side working cylinder 10 will also descend along with the lower beam 4, possibly resulting in the plunger of the second side working cylinder 10 being separated from the cylinder body thereof, so in step S19, the third connecting piece between the plunger of the second side working cylinder 10 and the lower beam 4 is disassembled, so that the plunger of the second side working cylinder 10 is prevented from being separated from the cylinder body thereof, and faults caused by the fact that the plunger of the second side working cylinder 10 is not required to be disassembled are effectively prevented; the third connecting piece can be a cylinder plunger rocker flange. In addition, after the third connecting piece is removed, the cylinder body and the plunger of the second side working cylinder 10 can be fixed into a whole and hung on the fixed beam 3, so that the plunger of the second side working cylinder 10 is effectively prevented from automatically falling down and separating from the cylinder body under the self gravity condition, and the safety of the second side working cylinder 10 is ensured; specifically, at least two connecting blocks may generally fix the cylinder body of the second side cylinder 10 and the plunger into an integral structure, and since the cylinder body of the second side cylinder 10 is itself connected to the fixed beam 3 through a fixing bolt, the second side cylinder 10 is effectively prevented from being separated from the fixed beam 3.

In one embodiment of the invention, S2, transferring the first master cylinder 8 and the first side cylinder 9 to a maintenance destination includes:

s21, laying a transport rail above the lower cross beam 4;

s22, placing a conveying device on the conveying track, hoisting the disassembled first main working cylinder 8 and the first side working cylinder 9 to the conveying device, and transferring the first main working cylinder 8 and the first side working cylinder 9 to a maintenance destination through the conveying device.

In step S21, a transport rail is laid on the ground above the lower beam 4, so that the transport device is ready for transport in the subsequent step.

In step S22, the transporting device is set on the transporting track, then the connection between the first main cylinder 8 and the first side cylinder 9 and the machine body side steel structure is released in sequence, so that the first main cylinder 8 and the first side cylinder 9 are separated from the machine body side steel structure and are in a free state, then the first main cylinder 8 and the first side cylinder 9 are respectively lifted off the closed frame by the lifting device such as the crown block through the mounting holes of the fixed beam 3 and are moved and placed on the transporting device, and then the first main cylinder 8 and the first side cylinder 9 are transported to the maintenance destination by the transporting device.

In particular, the transportation rail may be a rail car rail and the transportation means may be a rail electric flat car.

In one embodiment of the present invention, S3, transferring the assembled second main cylinder and third side cylinder to the mounting position of the cylinders, and completing the mounting operation thereof includes:

s31, transferring the assembled second main working cylinder and third side working cylinder through a conveying device;

s32, hoisting the second main working cylinder and the third side working cylinder to the installation position of the working cylinder through hoisting equipment, wherein the installation position of the second main working cylinder is the position of the first main working cylinder before dismantling, and the installation position of the third side working cylinder is the position of the first side working cylinder before dismantling;

s33, assembling a first connecting piece between the cylinder body of the second main working cylinder and the cylinder body of the third side working cylinder and the fixed beam 3, and assembling a second connecting piece between the plunger of the second main working cylinder and the plunger of the third side working cylinder and the lower cross beam 4.

In step S31, the assembled second main cylinder and third side cylinder are transported by the transporting device; the second main cylinder and the third side cylinder may be referred to as new second main cylinder and third side cylinder which are normally operated, and may be referred to as first main cylinder 8 and first side cylinder 9 which are maintenance-completed.

In step S32, the two second main cylinders and the one third side cylinder are each lifted to a cylinder mounting position by a lifting device, such as a crown block, for example, by the mounting holes of the fixed beam 3. Wherein the installation position of the second main cylinder is the position of the first main cylinder 8 before the disassembly, and the installation position of the third side cylinder is the position of the first side cylinder 9 before the disassembly, in other words, the second main cylinder replaces the original first main cylinder 8, and the third side cylinder replaces the original first side cylinder 9.

In step S33, the cylinder body of the second main cylinder is connected to the fixed beam 3 by a first connecting member, and the cylinder body of the third side cylinder is connected to the fixed beam 3 by another first connecting member, so that the cylinder bodies of the second main cylinder and the third side cylinder are assembled and fixed to the fixed beam 3. The plunger of the second main working cylinder is connected with the lower beam 4 through a second connecting piece, and the plunger of the third side working cylinder is connected with the lower beam 4 through another second connecting piece, so that the assembly and the fixation of the cylinder body of the second main working cylinder and the plunger of the third side working cylinder with the lower beam 4 are realized.

In one embodiment of the present invention, S4, said reassembling the closed frame, connecting the two ends of the extension bar 6 to the upper cross beam 2 and the lifting cylinder 5, respectively, comprises:

s41, reassembling a main body member of the closed frame; wherein the main body member comprises the pull rod assembly 7, an upper cross beam 2 and the upright 1;

s42, driving the upper beam 2 to be lifted to different height positions through the lifting cylinder 5 so as to assemble the extension bar 6 and the connecting accessory of the closed frame.

In step S41, the main body member of the closed frame is reassembled so that the frame of the hydraulic machine is restored to a state in which the frame can be normally operated by assembling the main body member after the cylinder body of the second main cylinder and the third side cylinder are assembled.

In step S42, the upper beam 2 is driven to rise to different height positions by the lifting cylinder 5, so that the extension bar 6 and the connection accessory are respectively installed, and connection between the plunger of the lifting cylinder 5 and the upper beam 2 and connection limitation between the upright 1 and the upper beam 2 are realized.

In one embodiment of the present invention, S41, reassembling the body member of the closed frame includes:

S411, hanging back the detached upright 1 through a first automobile crane, hanging back a pull rod piece of the pull rod assembly 7 through a second automobile crane, and arranging the pull rod piece in the upright 1;

s412, hanging back the upper beam 2 through the first automobile crane, and aligning the upper beam 2 with the pull rod piece;

s413, connecting the nut members of the pull rod assembly 7 to the pull rod members to fasten the upper beam 2 and the lower beam 4 to the top and bottom ends of the upright 1, respectively.

In step S411, the right column 1, which has been removed before in fig. 2, may be lifted back by the first crane, for example, a 300-ton crane, and the column 1 is mounted in place; the tie rod elements which have been removed before are suspended back into the column 1 on the right in fig. 2 by means of a second truck crane, for example a 25-ton truck crane, in preparation for the later connection of the upper and lower cross beams 2, 4 respectively, by means of the two ends of the tie rod assembly 7 extending out of the column 1.

In step S412, the previously removed upper beam 2 may be suspended back by the first truck crane and the upper beam 2 may be aligned or registered with the tie rods in the two uprights 1 to secure the upper beam 2 in place.

In step S413, each of the pull rod pieces in each of the columns 1 may be connected by each of the nut pieces, wherein a plurality of pull rod pieces may be installed in each of the columns 1, and at least one of the nut pieces may be installed at the upper end and the lower end of each of the pull rod pieces, respectively; the nut pieces at the upper ends of the upright posts 1 can be respectively fastened through the special stretcher according to a certain pretightening force so as to fix the upper cross beam 2 with the top ends of the upright posts 1 and the top ends of the pull rods, and the nut pieces at the lower ends of the upright posts 1 are respectively fastened through the special stretcher according to a certain pretightening force so as to fix the lower cross beam 4 with the bottom ends of the upright posts 1 and the bottom ends of the pull rods, so that the fastening installation of the upper cross beam 2 and the lower cross beam 4 with the upright posts 1 and the pull rods in the upright posts 1 in the closed frame is completed.

In one embodiment of the invention, S42 said driving the upper beam 2 to rise to different height positions by means of the lifting cylinders 5, to assemble the connection attachment of the extension bar 6 and the closed frame, comprises:

s421, adjusting the upper beam 2 of the closed frame to be lifted to the second height position through the lifting cylinder 5, and reassembling the extension rod 6 between the upper beam 2 and the lifting cylinder 5;

and S422, the upper cross beam 2 of the closed frame is adjusted to be lifted to the first height position through the lifting cylinder 5, and the connecting accessory is reinstalled on the upright 1.

In step S421, the upper beam 2 is adjusted to be raised to the second height position by the lift cylinder 5, and at this time, both ends of the extension bar 6 may be connected to the upper beam 2 and the lift cylinder 5, respectively, so that the assembly operation of the extension bar 6 between the upper beam 2 and the lift cylinder 5 is completed.

In step S422, after the extension bar 6 between the upper beam 2 and the lifting cylinder 5 is assembled, the lifting cylinder 5 drives the extension bar 6 to drive the upper beam 2 to rise to the first height position, and at this time, the connection accessory is mounted on the upright 1, so that the lifting position of the upper beam 2 relative to the upright 1 is limited by the connection accessory.

After step S4, the method may further include a step S5 of cleaning the site and performing a test run on the hydraulic machine after the maintenance is completed to determine whether the working cylinder of the hydraulic machine is restored to normal.

Although the invention is disclosed above, the scope of the invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications will fall within the scope of the invention.

Claims (10)

1. The hydraulic press comprises an upright post (1), an upper cross beam (2), a fixed beam (3), a lower cross beam (4), working cylinders and lifting cylinders (5), wherein a plurality of upright posts (1) are respectively penetrated through the upper cross beam (2), the fixed beam (3) and the lower cross beam (4) which are arranged at intervals up and down, a plurality of working cylinders are arranged at intervals, the working cylinders which are positioned in a space surrounded by the upright posts (1) are first main working cylinders (8), the working cylinders which are positioned outside the space and are to be removed are first side working cylinders (9), the opposite two ends of each working cylinder are respectively connected with the fixed beam (3) and the lower cross beam (4), a pull rod assembly (7) is arranged in the upright post (1), the upper end and the lower end of the pull rod assembly (7) which extends out of the upright post (1) are respectively connected with the upper cross beam (2) and the lower cross beam (4) to form a closed frame, the lifting cylinders (5) are arranged on the fixed beam (3) and the lifting cylinders (5) are connected with the upper end (6) through the lengthening cylinders (2);

The method for maintaining and replacing the working cylinder of the hydraulic machine is characterized by comprising the following steps of:

the upper cross beam (2) is driven to descend to different height positions through the lifting cylinder (5) 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 lengthening rod (6) and the main body component of the closed frame;

-transferring the first main working cylinder (8) and the first side working cylinder (9) to a maintenance destination;

transferring the assembled second main working cylinder and third side working cylinder to the working cylinder mounting position, and completing the mounting work;

the closed frame is reassembled, and the two ends of the extension rod (6) are respectively connected with the upper cross beam (2) and the lifting cylinder (5).

2. A method of cylinder repair and replacement of hydraulic presses according to claim 1, characterized in that said driving of the upper cross-beam (2) by the lifting cylinders (5) to the different height positions to remove the connection attachments of the closed frame, the first main cylinder (8) and the first side cylinder (9), the extension bar (6) and the body member of the closed frame comprises:

-adjusting the lowering of the upper cross beam (2) of the closed frame to a first height position by means of the lifting cylinder (5);

-removing the connection accessory of the closed frame from the upright (1); the connecting accessory comprises a stand column limiting sleeve and is used for limiting the lifting position of the upper cross beam (2) relative to the stand column (1);

-disassembling a first connection between the cylinder body of the first main working cylinder (8) and the cylinder body of the first side working cylinder (9) and the fixed beam (3), and-disassembling a second connection between the plunger of the first main working cylinder (8) and the plunger of the first side working cylinder (9) and the lower cross beam (4).

3. A method of cylinder repair and replacement of hydraulic presses according to claim 2, characterized in that said driving of the upper cross-beam (2) by the lifting cylinders (5) to the different height positions to remove the connection attachments of the closed frame, the first main cylinder (8) and the first side cylinder (9), the extension bar (6) and the body member of the closed frame further comprises:

-adjusting the lowering of the upper cross beam (2) from the first height position to a second height position by means of the lifting cylinder (5);

lifting the cylinder bodies of the first main working cylinder (8) and the first side working cylinder (9) through a lifting device so as to be higher than the fixed beam (3); and disassembling the extension rod (6) between the upper cross beam (2) and the lifting cylinder (5).

4. A method of cylinder repair and replacement of hydraulic presses according to claim 3, characterized in that driving the upper cross beam (2) down to different height positions by the lifting cylinder (5) to remove the attachment of the closed frame, the first main cylinder (8) and the first side cylinder (9), the extension bar (6) and the body member of the closed frame further comprises:

a backing plate is arranged below the lower cross beam (4);

the lifting cylinder (5) is used for adjusting the upper beam (2) to descend from the second height position to a third height position so as to drive the lower beam (4) to descend onto the base plate, and at the moment, the first main working cylinder (8) and the first side working cylinder (9) descend onto the base plate along with the lower beam (4);

detaching a body member of the enclosure frame; the main body member comprises the pull rod assembly (7), an upper cross beam (2) and the upright post (1).

5. A method of cylinder repair and replacement for hydraulic machines according to claim 4, characterized in that after the first main cylinder (8) and the first side cylinder (9) drop onto the pad with the lower cross-beam (4), it further comprises:

fixing the first main working cylinder (8) and the first side working cylinder (9) in a binding mode;

Disassembling a third connecting piece of a plunger of the second side working cylinder (10) and the lower cross beam (4), and fixing and suspending a cylinder body and the plunger of the second side working cylinder (10) on the fixed beam (3); wherein the cylinder outside the space without dismantling is a second side cylinder (10).

6. A method of cylinder repair replacement of a hydraulic machine according to claim 1, characterized in that transferring the first main cylinder (8) and the first side cylinder (9) to a repair destination comprises:

-laying a transport rail above the lower cross beam (4);

and placing a conveying device on the conveying track, hoisting the disassembled first main working cylinder (8) and the first side working cylinder (9) onto the conveying device, and transferring the first main working cylinder (8) and the first side working cylinder (9) to a maintenance destination through the conveying device.

7. The method of cylinder repair and replacement for hydraulic machine according to claim 1, wherein transferring the assembled second main cylinder and third side cylinder to the mounting position of the cylinders and performing the mounting operation thereof comprises:

transferring the assembled second main working cylinder and third side working cylinder through a conveying device;

Hoisting the second main working cylinder and the third side working cylinder to the mounting position of the working cylinder through hoisting equipment, wherein the mounting position of the second main working cylinder is the position of the first main working cylinder (8) before dismantling, and the mounting position of the third side working cylinder is the position of the first side working cylinder (9) before dismantling;

and assembling a first connecting piece between the cylinder body of the second main working cylinder and the cylinder body of the third side working cylinder and the fixed beam (3), and assembling a second connecting piece between the plunger of the second main working cylinder and the plunger of the third side working cylinder and the lower cross beam (4).

8. A method of cylinder repair and replacement for hydraulic presses according to claim 3, characterized in that said reassembling said closed frame, connecting the two ends of said extension bar (6) to said upper cross-beam (2) and to said lifting cylinder (5), respectively, comprises:

reassembling the body member of the enclosure frame; wherein the main body member comprises the pull rod assembly (7), an upper cross beam (2) and the upright post (1);

the upper cross beam (2) is driven to be lifted to different height positions by the lifting cylinder (5) so as to assemble the extension bar (6) and the connecting accessory of the closed frame.

9. The method of cylinder service replacement for a hydraulic machine of claim 8, wherein reassembling the body member of the closed frame comprises:

the detached upright (1) is hung back through a first automobile crane, a pull rod piece of the pull rod assembly (7) is hung back through a second automobile crane, and the pull rod piece is arranged in the upright (1);

the upper cross beam (2) is hung back through the first automobile crane, and the upper cross beam (2) is aligned with the pull rod piece;

and connecting the nut piece of the pull rod assembly (7) with the pull rod piece so as to fasten the upper cross beam (2) and the lower cross beam (4) at the top end and the bottom end of the upright post (1) respectively.

10. A method of service cylinder replacement of a hydraulic machine according to claim 8, characterized in that said driving the upper cross-beam (2) to raise to different height positions by means of the lifting cylinders (5) to assemble the connection attachment of the extension bar (6) and the closed frame comprises:

-adjusting the lifting of the upper cross beam (2) of the closed frame to the second height position by means of the lifting cylinder (5), reassembling the extension bar (6) between the upper cross beam (2) and the lifting cylinder (5);

the upper cross beam (2) of the closed frame is adjusted to be lifted to the first height position by the lifting cylinder (5), and the connecting accessory is reinstalled on the upright (1).