CN109678070B - Movable counterweight realizing mechanism of movable arm tower crane - Google Patents
Movable counterweight realizing mechanism of movable arm tower crane Download PDFInfo
- Publication number
- CN109678070B CN109678070B CN201910131576.4A CN201910131576A CN109678070B CN 109678070 B CN109678070 B CN 109678070B CN 201910131576 A CN201910131576 A CN 201910131576A CN 109678070 B CN109678070 B CN 109678070B
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- tower crane
- movable
- pulley
- steel wire
- counterweight
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 26
- 239000010959 steel Substances 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Classifications
-
- 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
- B66C23/72—Counterweights or supports for balancing lifting couples
- B66C23/74—Counterweights or supports for balancing lifting couples separate from jib
- B66C23/76—Counterweights or supports for balancing lifting couples separate from jib and movable to take account of variations of load or of variations of length of jib
Abstract
The invention relates to a mechanical structure, in particular to a movable counterweight realizing mechanism of a movable arm tower crane, which comprises a guy rope, a herringbone frame front stay bar, a steel wire rope pulley block, a guide pulley, a hydraulic cylinder with an energy accumulator, a counterweight, an inclined track, a tower crane platform and a herringbone frame rear stay bar. The bottom end of the herringbone frame rear pull rod is hinged to the tower crane platform, the top end of the herringbone frame front support rod is hinged to the top end of the herringbone frame rear pull rod, the bottom end of the herringbone frame front support rod is fixedly connected with a cylinder barrel of a hydraulic cylinder with an energy accumulator, and a piston rod of the hydraulic cylinder with the energy accumulator is hinged to the tower crane platform; the tower crane platform is provided with an inclined track, the counterweight is suspended on the inclined track, and the steel wire rope pulley block is connected with the front support rod of the propeller strut and the tower crane platform; the stay cable is hinged at the joint of the front support rod of the propeller strut and the rear support rod of the propeller strut. The invention can solve the problem of moment balance of the movable arm type tower crane and improve the overall safety of the tower crane.
Description
Technical Field
The invention relates to a mechanical structure, in particular to a movable counterweight realizing mechanism of a movable arm type tower crane.
Background
The rising and rapid development of high-rise buildings are more and more in demand for the movable arm type tower crane, and especially, the movable arm type tower crane works in a narrow space of a high level, and higher requirements are put forward on the balance and safety of the movable arm type tower crane, so that the movable arm type tower crane needs to ensure balance between lifting moment and stabilizing moment in the working process, the overall stability of the tower crane is ensured, meanwhile, the bending moment borne by a tower body is reduced, and the stress condition of the tower body is improved. The method for changing the balance moment by adopting the movable counterweight to adapt to the requirement of the change of the lifting moment is mainly adopted at present, but the movement of the movable counterweight of the existing movable arm type tower crane is mainly related to the elevation angle of the arm support, the load moment can not be balanced to the maximum extent, and the realization mechanism is complex and the cost is higher.
Disclosure of Invention
The invention provides a movable counterweight realizing mechanism of a movable arm type tower crane, which solves the problem of moment balance of the movable arm type tower crane and improves the overall safety of the tower crane.
The technical scheme of the invention is as follows:
the movable counterweight realizing mechanism comprises a guy cable, a propeller strut front stay rod, a steel wire rope pulley block, a guide pulley, a hydraulic cylinder with an energy accumulator, a counterweight, an inclined track, a tower crane platform and a propeller strut rear stay rod, wherein the bottom end of the propeller strut rear stay rod is hinged on the tower crane platform, the top end of the propeller strut front stay rod is hinged with the top end of the propeller strut rear stay rod, the bottom end of the propeller strut front stay rod is fixedly connected with a cylinder barrel of the hydraulic cylinder with the energy accumulator, and a piston rod of the hydraulic cylinder with the energy accumulator is hinged with the tower crane platform; the tower crane platform is provided with the inclined track, the counterweight is suspended on the inclined track, and the guide pulley is arranged on the side wall of the tower crane platform; the steel wire rope pulley block comprises a steel wire rope, a fixed pulley and a movable pulley, the movable pulley is arranged on a front supporting rod of the herringbone frame, the fixed pulley is arranged on the tower crane platform, the steel wire rope is wound on the fixed pulley and the movable pulley and bypasses the guide pulley, and the end head of the steel wire rope is fixed on the counterweight; the stay cable is arranged at the joint of the bracket front stay bar and the bracket rear stay bar.
The movable counterweight realizing mechanism of the movable arm tower crane has the preferable scheme that the counterweight is moved through the pulley block and the hydraulic cylinder with the energy accumulator.
The movable counterweight realizing mechanism of the movable arm tower crane has the preferable scheme that the number of the fixed pulleys and the movable pulleys is one or more, and the number of the fixed pulleys and the movable pulleys is determined according to the actual multiplying power and the pulley block requirement.
The operation principle of the movable balance weight realizing mechanism of the movable arm tower crane is as follows: the lifting moment causes the length of the front stay bar of the propeller strut to change, namely, the accumulator changes correspondingly with the front stay bar of the propeller strut in the extending or retracting process of the piston rod, and two cavities of the hydraulic cylinder are connected with the accumulator to form a complete hydraulic loop; when the lifting moment is increased, the extension of a piston rod of a hydraulic cylinder with an energy accumulator is increased, so that the total length of the hydraulic cylinder with the energy accumulator and a front support rod of the propeller strut is prolonged, a movable pulley on the front support rod of the propeller strut is driven to move obliquely upwards, the center distance between the movable pulley and the movable pulley of the pulley block is increased, a steel wire rope drives a movable counterweight to move obliquely upwards along an inclined track through a guide pulley, a counterweight is increased to a moment arm of a rotation center of the tower crane, and the balance moment is increased, so that the aim of balancing with the lifting moment is fulfilled; when the lifting moment is reduced, the piston rod of the hydraulic cylinder with the energy accumulator is retracted, the total length of the hydraulic cylinder with the energy accumulator and the front support rod of the propeller strut is shortened, the movable pulley on the front support rod of the propeller strut moves obliquely downwards, the center distance between the movable pulley and the movable pulley of the pulley block is reduced, the steel wire rope drives the counterweight to move obliquely downwards along the inclined track through the guide pulley, the counterweight is reduced to the moment arm of the rotation center of the tower crane, and the balance moment is reduced, so that the purpose of balancing with the lifting moment is achieved.
The beneficial effects of the invention are as follows:
(1) The movable counterweight realizing mechanism designed by the invention drives the movable counterweight by utilizing the front support rod of the propeller strut with the length changing along with the lifting moment through reasonable layout, so that the load moment is effectively balanced to the greatest extent and the safety is improved;
(2) Compared with the traditional movable arm type tower crane movable counterweight mechanism, the movable arm type tower crane movable counterweight mechanism directly utilizes the structure of a tower crane platform, has more compact structure, is more convenient to install and maintain and has lower cost;
(3) The hydraulic cylinder with the energy accumulator can effectively utilize the change of the lifting moment to generate energy which is converted into the pressure energy stored in the energy accumulator, so that the economical efficiency is good;
(4) The balance weight connected with the steel wire rope pulley block has good synchronism with the length change of the front support rod of the propeller strut, and can ensure that the load moment is balanced to the maximum extent under the micro-interval change of the hoisting arm.
(5) Parameters such as multiplying power of the steel wire rope pulley block, size of the hydraulic cylinder, pressure of the energy accumulator and the like can be designed according to parameters of different movable arm tower cranes, and the application range is wide.
Drawings
Fig. 1 is a schematic structural view of a movable counterweight realization mechanism of a movable arm type tower crane.
Detailed Description
As shown in fig. 1, the movable balance weight realizing mechanism of the movable arm tower crane comprises a guy cable 1, a propeller strut front stay bar 2, a steel wire rope pulley block 3, a guide pulley 12, a hydraulic cylinder 4 with an energy accumulator, a balance weight 5, an inclined track 6, a tower crane platform 7 and a propeller strut rear stay bar 8, wherein the bottom end of the propeller strut rear stay bar 8 is hinged on the tower crane platform 7, the top end of the propeller strut front stay bar 2 is hinged with the top end of the propeller strut rear stay bar 8, the bottom end of the propeller strut front stay bar 2 is fixedly connected with a cylinder barrel of the hydraulic cylinder 4 with the energy accumulator, and a piston rod of the hydraulic cylinder 4 with the energy accumulator is hinged with the tower crane platform 7; the tower crane platform 7 is provided with the inclined track 6, the counterweight 5 is suspended on the inclined track 6, the guide pulley 12 is mounted on the side wall of the tower crane platform 7, the steel wire rope pulley block 3 comprises steel wire ropes 9, fixed pulleys 10 and movable pulleys 11, the number of the movable pulleys 11 is one, the movable pulleys 11 are mounted on the propeller strut 2, the fixed pulleys 10 are mounted on the tower crane platform 7, the steel wire ropes 9 are wound on the fixed pulleys 10 and the movable pulleys 11 and bypass the guide pulley 12, and the end heads of the steel wire ropes 9 are fixed on the counterweight 5; the stay cable 1 is hinged at the joint of the propeller strut front stay bar 2 and the propeller strut rear stay bar 8.
The operation principle of the movable balance weight realizing mechanism of the movable arm tower crane is as follows: the lifting moment changes the length change of the front stay bar 2 of the propeller strut, namely, the accumulator changes correspondingly with the piston rod in the extending or retracting process, and two cavities of the hydraulic cylinder are connected with the accumulator to form a complete hydraulic loop; the guy cable 1 is connected with the crane boom, when the lifting moment is increased, the extension of a piston rod of the hydraulic cylinder 4 with the energy accumulator is increased, meanwhile, the total length of the hydraulic cylinder 4 with the energy accumulator and the propeller strut 2 is prolonged, the movable pulley 11 on the propeller strut 2 is driven to move obliquely upwards, the center distance between the movable pulley and the movable pulley of the pulley block is increased, the steel wire rope 9 drives the counterweight 5 to move obliquely upwards along the inclined track 6 through the guide pulley 10, the moment arm of the counterweight 5 to the rotation center of the tower crane is increased, the balance moment is increased, and the purpose of balancing with the lifting moment is achieved; when the lifting moment is reduced, the piston rod of the hydraulic cylinder 4 with the energy accumulator is retracted, the total length of the hydraulic cylinder 4 with the energy accumulator and the propeller strut 2 is shortened, the movable pulley 11 on the propeller strut 2 moves obliquely downwards, the center distance between the movable pulley and the movable pulley is reduced, the steel wire rope 9 drives the counterweight 5 to move obliquely downwards along the inclined track 6 through the guide pulley 10, the arm of force from the counterweight 5 to the rotation center of the tower crane is reduced, the balancing moment is reduced, and the purpose of balancing with the lifting moment is achieved.
Claims (1)
1. The movable counterweight realizing mechanism of the movable arm tower crane is characterized by comprising a guy cable, a herringbone frame front stay bar, a steel wire rope pulley block, a guide pulley, a hydraulic cylinder with an energy accumulator, a counterweight, an inclined track, a tower crane platform and a herringbone frame rear stay bar, wherein the bottom end of the herringbone frame rear stay bar is hinged to the tower crane platform, the top end of the herringbone frame front stay bar is hinged to the top end of the herringbone frame rear stay bar, the bottom end of the herringbone frame front stay bar is fixedly connected with a cylinder barrel of the hydraulic cylinder, and a piston rod of the hydraulic cylinder is hinged to the tower crane platform; the tower crane platform is provided with the inclined track, and the counterweight is hung on the inclined track; the guide pulley is arranged on the side wall of the tower crane platform; the steel wire rope pulley block comprises a steel wire rope, a fixed pulley and a movable pulley, the movable pulley is arranged on a front supporting rod of the herringbone frame, the fixed pulley is arranged on the tower crane platform, the steel wire rope is wound on the fixed pulley and the movable pulley and bypasses the guide pulley, and the end head of the steel wire rope is fixed on the counterweight; the inhaul cable is arranged at the joint of the front support rod of the herringbone frame and the rear support rod of the herringbone frame; the balance weight is moved through the steel wire rope pulley block and the hydraulic cylinder with the energy accumulator; the number of the fixed pulleys and the movable pulleys is one or more, and the number of the fixed pulleys and the movable pulleys is determined according to the actual multiplying power and the requirements of the steel wire rope pulley blocks; the multiplying power of the steel wire rope pulley block, the size of the hydraulic cylinder and the pressure of the energy accumulator are designed according to the parameters of different movable arm type tower cranes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910131576.4A CN109678070B (en) | 2019-02-22 | 2019-02-22 | Movable counterweight realizing mechanism of movable arm tower crane |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910131576.4A CN109678070B (en) | 2019-02-22 | 2019-02-22 | Movable counterweight realizing mechanism of movable arm tower crane |
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| CN109678070A CN109678070A (en) | 2019-04-26 |
| CN109678070B true CN109678070B (en) | 2024-01-30 |
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| CN201910131576.4A Active CN109678070B (en) | 2019-02-22 | 2019-02-22 | Movable counterweight realizing mechanism of movable arm tower crane |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111024385B (en) * | 2019-12-25 | 2022-05-06 | 航天科工智能机器人有限责任公司 | Maximum load testing device for harmonic reducer |
| CN113292018A (en) * | 2021-06-09 | 2021-08-24 | 山西高行液压股份有限公司 | Reverse vehicle righting method |
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| EP1084987A1 (en) * | 1999-09-13 | 2001-03-21 | Grove U.S. LLC | Retractable counterweight for straight-boom aerial work platform |
| EP1103512A1 (en) * | 1999-11-25 | 2001-05-30 | Alexis Montgon | Variable reach crane jib with automatic counterbalancing device |
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2019
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| EP1084987A1 (en) * | 1999-09-13 | 2001-03-21 | Grove U.S. LLC | Retractable counterweight for straight-boom aerial work platform |
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| CN109678070A (en) | 2019-04-26 |
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