CN112723196A - Method for replacing hinge point bearing under large pull rod of portal crane - Google Patents
Method for replacing hinge point bearing under large pull rod of portal crane Download PDFInfo
- Publication number
- CN112723196A CN112723196A CN202011560109.2A CN202011560109A CN112723196A CN 112723196 A CN112723196 A CN 112723196A CN 202011560109 A CN202011560109 A CN 202011560109A CN 112723196 A CN112723196 A CN 112723196A
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- Prior art keywords
- pull rod
- large pull
- arm support
- trunk
- amplitude
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/04—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack
- B66C13/08—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack for depositing loads in desired attitudes or positions
Abstract
The invention discloses a method for replacing a hinge point bearing under a large pull rod of a portal crane, which comprises the following steps: finding out the balance point position of the four-bar arm support system; measuring the distance between the tail of the trunk and the lifting lug at the head of the arm support, and cutting off the pulley support of the trunk to move to the end close to the balance beam; removing the lubricating pipeline when the arm support system reaches the maximum amplitude; connecting a lifting lug at the bottom of the trunk like the nose bridge with a lifting lug at the head of the arm support; and locking the amplitude variation brake when the arm support receives amplitude to the step balance point. Connecting a supporting rod lifting lug at the tail part of the balance beam with a lifting lug at the tail part of the turntable; loosening the variable-amplitude brake after the chain block is tightened; the chain block is tightened until the wire rope connecting the arm support and the trunk of the elephant nose tightens the amplitude varying brake to be tightly held; connecting the lower part of the large pull rod with the main beams on two sides of the balance beam; removing the lower hinge point shaft of the large pull rod; meanwhile, the two chain blocks at the lower part of the large pull rod are retracted, so that the lower hinge point of the large pull rod can be separated from the support of the lower hinge point of the large pull rod. The invention can reduce the construction difficulty.
Description
Technical Field
The invention relates to the field of cranes, in particular to a method for replacing a hinge point bearing under a large pull rod of a portal crane.
Background
The four-bar linkage structure of the portal crane is shown in figure 1, wherein the arm support system comprises an arm support, a trunk, and a large pull rod which are connected through a hinge shaft; the arm support system, the upper rotary column, the turntable supporting member, the balance beam and the small pull rod form a four-connecting-rod plane mechanism, namely a four-connecting-rod arm support system. For example, as shown in fig. 1, the large pull rod structure is used as an important component of the four-bar linkage structure, and the lower hinge point bearing is damaged due to impact, improper maintenance and the like in the use process, so that the normal operation of the whole boom system is affected, and the lower hinge point bearing needs to be replaced.
At present, the method for replacing the bearing of the lower hinge point of the large pull rod by each user unit is to use two truck cranes A1 and A2, firstly remove the lifting steel wire rope, then connect the balance beam and the upper rotary column by a rigid support rod, then use one truck crane to lift the large pull rod to separate the lower hinge point from the hinge seat of the large pull rod, replace the damaged bearing, then re-install the lower hinge point of the large pull rod into the hinge seat of the large pull rod, lift the head of the trunk of the. In the process, firstly, four lifting steel wire ropes need to be detached, and after the bearing is replaced, the four lifting steel wire ropes need to be installed again, so that the rope replacing period is long; before the large pull rod is disassembled, the balance beam and the upper rotary column need to be connected by using the stay bar, and the stay bar needs to be disassembled after the large pull rod is disassembled, so that the high-altitude construction in the process is difficult; meanwhile, the whole replacement process needs the whole matching of two truck cranes, the cost of the rented truck crane is high, and the cost is high.
Disclosure of Invention
1. The technical problem to be solved is as follows:
aiming at the technical problems, the invention provides a method for replacing a hinge point bearing under a large pull rod of a gantry crane, and the method does not need to disassemble and assemble a lifting steel wire rope and can greatly shorten the replacement period; the supporting rod of the balance beam is not required to be additionally arranged, so that the construction difficulty is reduced; and the whole process does not need the matching of a truck crane, thereby greatly reducing the maintenance cost.
2. The technical scheme is as follows:
a replacement method of a lower hinge point bearing of a large pull rod of a portal crane is applied to a boom system of the portal crane, wherein the boom system of the portal crane is connected by a boom, a elephant nose bridge and the large pull rod through a hinge shaft; the arm support system, the upper rotary column, the turntable supporting member, the balance beam and the small pull rod form a four-connecting-rod plane mechanism, namely a four-connecting-rod arm support system, and the four-connecting-rod arm support system is characterized in that: the method for replacing the hinge point bearing under the large pull rod comprises the following steps:
the method comprises the following steps: locking a rotary brake of a rotating mechanism which drives a four-bar arm support system of the gantry crane to rotate horizontally by 360 degrees, controlling the arm support to stop at a position slightly smaller than the maximum working amplitude of a gantry crane through an amplitude variation mechanism, and then slowly releasing the amplitude variation brake to find out the position of a balance point of the four-bar arm support system; the working amplitude of the gantry crane is the horizontal distance from the center of the upper rotary column to the head of the trunk bridge.
Step two: and selecting the position of a balance point as a stop point for replacing a bearing at a hinge point under the large pull rod, measuring the distance between the nose bridge tail lifting lug and the arm support head lifting lug at the moment, and selecting the length of a steel wire rope for connecting the nose bridge lifting lug and the arm support head lifting lug according to the distance.
And thirdly, cutting off the pulley support at the top of the herringbone frame at the upper end of the trunk like the nose, and moving the pulley support to be tightly attached to one side of the balance beam by using a chain block device.
Step four: after the boom system is placed at the position with the maximum working amplitude of the gantry crane by controlling the amplitude variation mechanism, a centralized lubricating pipeline arranged at the position of a lower hinge point of the large pull rod is removed; connecting a lifting lug at the bottom of the trunk of the; and the length of the steel wire rope is the length of the steel wire rope measured in the step two.
Step five: and (3) controlling the amplitude variation brake at a low speed to reduce the amplitude of the arm support, and stopping the machine when the position of the balance point detected in the step one is reached, namely the steel wire rope between the nose bridge and the large pull rod is tightened, so that the amplitude variation brake is locked.
Step six: two chain blocks which meet the safety specification and have the same diameter as the safety specification and two steel wire ropes which meet the safety specification and have the same diameter are used for shackle meeting the safety specification and connecting the two sides of the lifting lug of the tail strut of the balance beam and the lifting lug of the tail of the turntable respectively; if the steel wire rope needs to pass through the machine room, a through hole is formed in the top of the machine room when the machine room is at the top of the machine room, so that the steel wire rope passes through the through hole; after the two chain blocks in the step are tightened, the amplitude-variable brake can be loosened; continuously tightening the chain block in the step until the steel wire rope connected with the head of the arm support and the bottom of the trunk of the elephant nose is tightened; at the moment, the amplitude-variable brake is put down, and the manual release handle is released, so that the amplitude-variable brake is held tightly; and (4) removing the chain block, the steel wire rope and the shackle at the tail part of the balance beam.
Step seven: the main beams on the two sides of the balance beam are used as supporting points, and a chain block of 5t is hung on each supporting point to connect the lower part of the large pull rod with the main beams on the two sides of the balance beam; removing the lower hinge point shaft of the large pull rod; meanwhile, the two chain blocks at the lower part of the large pull rod are retracted, so that the lower hinge point of the large pull rod can be separated from the support of the lower hinge point of the large pull rod; the bearing, the end cover and the shaft sleeve part which need to be replaced in the lower hinge point of the large pull rod can be replaced.
Step eight: when the crane is installed after replacement, the trunk bridge of the adjacent gantry crane is parked right above the trunk bridge head of the gantry crane, the trunk bridge structure of the adjacent gantry crane is used as a fulcrum, and the trunk bridge head of the gantry crane is hung by using a steel wire rope meeting safety specifications and a chain block of the steel wire rope meeting safety specifications; the chain block at the position and the chain block at the lower part of the large pull rod are adjusted, and the lower hinge shaft of the large pull rod is inserted after the lower hinge point of the large pull rod is aligned again.
Step nine: and (4) moving the pulley support cut off in the third step to the top surface of the herringbone frame again by using a chain block, and fully welding the pulley support and the top surface of the herringbone frame.
Step ten: installing the central lubricating pipeline detached in the fourth step; and (5) polishing and finishing after painting.
3. Has the advantages that:
according to the replacement method of the hinge point bearing under the large pull rod of the portal crane, the hoisting steel wire rope does not need to be disassembled and assembled, so that the replacement period is greatly shortened; the method does not need to additionally install a balance beam brace rod, so that the construction difficulty is reduced; the whole process does not need the matching of a truck crane, thereby greatly reducing the maintenance cost.
Drawings
FIG. 1 is a structural diagram of a four-bar linkage structure of a gantry crane;
FIG. 2 is a schematic view of a method for replacing a hinge point bearing at the lower end of a large pull rod of a portal crane in the prior art;
FIG. 3 is a schematic diagram illustrating the operation of step four to step six in the present invention;
FIG. 4 is an external view of the connection of the main beams at the two sides of the balance beam and the lower hinge point of the large pull rod in the seventh step of the invention;
FIG. 5 is a cross-sectional view of the connection of the main beams at both sides of the equalizing beam and the lower hinge point of the large pull rod in the seventh step of the present invention;
FIG. 6 is a diagram illustrating the operation of step four in the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 3 to 5, a method for replacing a hinge point bearing at the lower part of a large pull rod of a portal crane is applied to a boom system of the portal crane, wherein the boom system of the portal crane is connected by a boom 1, a elephant nose bridge 2 and the large pull rod 3 through a hinge shaft; the arm support system, the upper rotary column 4, the rotary table supporting member 5, the balance beam 6 and the small pull rod 7 form a four-connecting-rod plane mechanism, namely a four-connecting-rod arm support system, and the four-connecting-rod arm support system is characterized in that: the replacement method of the bearing of the large pull rod lower hinge point 8 comprises the following steps:
the method comprises the following steps: locking a rotary brake of a rotating mechanism which drives a four-bar arm support system of the gantry crane to rotate horizontally by 360 degrees, controlling the arm support to stop at a position slightly smaller than the maximum working amplitude of a gantry crane through an amplitude variation mechanism, and then slowly releasing the amplitude variation brake to find out the position of a balance point of the four-bar arm support system; the working amplitude of the gantry crane is the horizontal distance from the center of the upper rotary column to the head of the trunk bridge.
Step two: and selecting the position of a balance point as a stop point for replacing a bearing at a hinge point under the large pull rod, measuring the distance between the nose bridge tail lifting lug and the arm support head lifting lug at the moment, and selecting the length of a steel wire rope for connecting the nose bridge lifting lug and the arm support head lifting lug according to the distance.
And thirdly, cutting off the pulley support at the top of the herringbone frame at the upper end of the trunk like the nose, and moving the pulley support to be tightly attached to one side of the balance beam by using a chain block 14 device.
Step four: after the boom system is placed at the position with the maximum working amplitude of the gantry crane by controlling the amplitude variation mechanism, a centralized lubricating pipeline arranged at the position of a lower hinge point of the large pull rod is removed; as shown in the attached figure 3, two steel wire ropes 9 with the specification meeting the safety requirement and shackles with the tonnage meeting the safety requirement are used for connecting a lifting lug at the bottom of the nose bridge and a lifting lug at the head of the arm support; the length of the wire rope 9 is the length of the wire rope measured in step two.
Step five: and (3) controlling the amplitude variation brake at a low speed to reduce the amplitude of the arm support, and stopping the machine when the position of the balance point detected in the step one is reached, namely the steel wire rope between the nose bridge and the large pull rod is tightened, so that the amplitude variation brake is locked.
Step six: as shown in attached figures 3 and 6, two chain blocks 14 with tonnage meeting safety specifications, two steel wire ropes 9 with diameters meeting safety specifications and shackles with tonnage meeting safety specifications are used for respectively connecting two sides of a lifting lug 12 of a tail strut of a balance beam and a lifting lug 13 of a tail of a rotary table; if the steel wire rope needs to pass through the machine room, a through hole is formed in the top of the machine room when the machine room is at the top of the machine room, so that the steel wire rope passes through the through hole; after the two chain blocks in the step are tightened, the amplitude-variable brake can be loosened; continuously tightening the chain block in the step until the steel wire rope connected with the head of the arm support and the bottom of the trunk of the elephant nose is tightened; at the moment, the amplitude-variable brake is put down, and the manual release handle is released, so that the amplitude-variable brake is held tightly; and (4) removing the chain block, the steel wire rope and the shackle at the tail part of the balance beam. Fig. 3 is a diagram of a machine room.
Step seven: as shown in the attached fig. 4 and 5, the main beams 11 at the two sides of the balance beam are used as supporting points, and a chain block of 5t is hung on each of the main beams to connect the lower part of the large pull rod with the main beams at the two sides of the balance beam; removing the lower hinge point shaft of the large pull rod; meanwhile, the two chain blocks at the lower part of the large pull rod are retracted, so that the lower hinge point of the large pull rod can be separated from the support of the lower hinge point of the large pull rod; the bearing, the end cover and the shaft sleeve part which need to be replaced in the lower hinge point of the large pull rod can be replaced.
Step eight: when the crane is installed after replacement, the trunk bridge of the adjacent gantry crane is parked right above the trunk bridge head of the gantry crane, the trunk bridge structure of the adjacent gantry crane is used as a fulcrum, and the trunk bridge head of the gantry crane is hung by using a steel wire rope meeting safety specifications and a chain block of the steel wire rope meeting safety specifications; the chain block at the position and the chain block at the lower part of the large pull rod are adjusted, and the lower hinge shaft of the large pull rod is inserted after the lower hinge point of the large pull rod is aligned again.
Step nine: and (4) moving the pulley support cut off in the third step to the top surface of the herringbone frame again by using a chain block, and fully welding the pulley support and the top surface of the herringbone frame.
Step ten: installing the central lubricating pipeline detached in the fourth step; and (5) polishing and finishing after painting.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (1)
1. A replacement method of a lower hinge point bearing of a large pull rod of a portal crane is applied to a boom system of the portal crane, wherein the boom system of the portal crane is connected by a boom, a elephant nose bridge and the large pull rod through a hinge shaft; the arm support system, the upper rotary column, the turntable supporting member, the balance beam and the small pull rod form a four-connecting-rod plane mechanism, namely a four-connecting-rod arm support system, and the four-connecting-rod arm support system is characterized in that: the method for replacing the hinge point bearing under the large pull rod comprises the following steps:
the method comprises the following steps: locking a rotary brake of a rotating mechanism which drives a four-bar arm support system of the gantry crane to rotate horizontally by 360 degrees, controlling the arm support to stop at a position slightly smaller than the maximum working amplitude of a gantry crane through an amplitude variation mechanism, and then slowly releasing the amplitude variation brake to find out the position of a balance point of the four-bar arm support system; the working amplitude of the gantry crane is the horizontal distance from the center of the upper rotary column to the head of the trunk bridge of the trunk;
step two: selecting the position of a balance point as a stop point for replacing a bearing at a hinge point under a large pull rod, measuring the distance between a lifting lug at the tail part of the trunk nose bridge and a lifting lug at the head part of the arm support at the moment, and selecting the length of a steel wire rope for connecting the lifting lug at the trunk nose bridge and the lifting lug at the head part of the arm support according to the distance;
cutting off a pulley support at the top of a herringbone frame at the upper end of the trunk of the elephant's nose, and moving the pulley support to be tightly attached to one side of the balance beam by using a chain block device;
step four: after the boom system is placed at the position with the maximum working amplitude of the gantry crane by controlling the amplitude variation mechanism, a centralized lubricating pipeline arranged at the position of a lower hinge point of the large pull rod is removed; connecting a lifting lug at the bottom of the trunk of the; the length of the steel wire rope is the length of the steel wire rope measured in the step two;
step five: the amplitude variation brake is controlled at a low speed to reduce the amplitude of the arm support, the amplitude is collected to the position of the balance point detected in the step one, and the machine is stopped when a steel wire rope between the bridge of the nose and the large pull rod is required to be tightened, so that the amplitude variation brake is locked;
step six: two chain blocks which meet the safety specification and have the same diameter as the safety specification and two steel wire ropes which meet the safety specification and have the same diameter are used for shackle meeting the safety specification and connecting the two sides of the lifting lug of the tail strut of the balance beam and the lifting lug of the tail of the turntable respectively; if the steel wire rope needs to pass through the machine room, a through hole is formed in the top of the machine room when the machine room is at the top of the machine room, so that the steel wire rope passes through the through hole; after the two chain blocks in the step are tightened, the amplitude-variable brake can be loosened; continuously tightening the chain block in the step until the steel wire rope connected with the head of the arm support and the bottom of the trunk of the elephant nose is tightened; at the moment, the amplitude-variable brake is put down, and the manual release handle is released, so that the amplitude-variable brake is held tightly; removing a chain block, a steel wire rope and a shackle at the tail part of the balance beam;
step seven: the main beams on the two sides of the balance beam are used as supporting points, and a chain block of 5t is hung on each supporting point to connect the lower part of the large pull rod with the main beams on the two sides of the balance beam; removing the lower hinge point shaft of the large pull rod; meanwhile, the two chain blocks at the lower part of the large pull rod are retracted, so that the lower hinge point of the large pull rod can be separated from the support of the lower hinge point of the large pull rod; the bearing, the end cover and the shaft sleeve part which need to be replaced in the lower hinge point of the large pull rod can be replaced;
step eight: when the crane is installed after replacement, the trunk bridge of the adjacent gantry crane is parked right above the trunk bridge head of the gantry crane, the trunk bridge structure of the adjacent gantry crane is used as a fulcrum, and the trunk bridge head of the gantry crane is hung by using a steel wire rope meeting safety specifications and a chain block of the steel wire rope meeting safety specifications; adjusting the chain block at the position and the chain block at the lower part of the large pull rod, aligning the lower hinge point of the large pull rod again, and then penetrating the lower hinge shaft of the large pull rod;
step nine: moving the pulley support cut off in the third step to the top surface of the herringbone frame again by using a chain block, and fully welding the pulley support and the top surface of the herringbone frame;
step ten: installing the central lubricating pipeline detached in the fourth step; and (5) polishing and finishing after painting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011560109.2A CN112723196A (en) | 2020-12-25 | 2020-12-25 | Method for replacing hinge point bearing under large pull rod of portal crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011560109.2A CN112723196A (en) | 2020-12-25 | 2020-12-25 | Method for replacing hinge point bearing under large pull rod of portal crane |
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|---|---|
| CN112723196A true CN112723196A (en) | 2021-04-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011560109.2A Pending CN112723196A (en) | 2020-12-25 | 2020-12-25 | Method for replacing hinge point bearing under large pull rod of portal crane |
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| CN (1) | CN112723196A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113772565A (en) * | 2021-09-07 | 2021-12-10 | 安徽工业大学 | Luffing mechanism with balanced deadweight of jib for single jib of gantry crane |
| CN116713629A (en) * | 2023-08-09 | 2023-09-08 | 广州文船重工有限公司 | Assembling method for large pin wheel and supporting rod of portal crane |
-
2020
- 2020-12-25 CN CN202011560109.2A patent/CN112723196A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113772565A (en) * | 2021-09-07 | 2021-12-10 | 安徽工业大学 | Luffing mechanism with balanced deadweight of jib for single jib of gantry crane |
| CN116713629A (en) * | 2023-08-09 | 2023-09-08 | 广州文船重工有限公司 | Assembling method for large pin wheel and supporting rod of portal crane |
| CN116713629B (en) * | 2023-08-09 | 2023-10-03 | 广州文船重工有限公司 | Assembling method for large pin wheel and supporting rod of portal crane |
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