CN116588831A - Jacking device of tower crane and hydraulic control system - Google Patents
Jacking device of tower crane and hydraulic control system Download PDFInfo
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- CN116588831A CN116588831A CN202310048284.0A CN202310048284A CN116588831A CN 116588831 A CN116588831 A CN 116588831A CN 202310048284 A CN202310048284 A CN 202310048284A CN 116588831 A CN116588831 A CN 116588831A
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- jacking
- reversing valve
- auxiliary
- cylinder
- sleeve frame
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- 230000002457 bidirectional effect Effects 0.000 claims description 4
- 239000003921 oil Substances 0.000 description 84
- 230000007246 mechanism Effects 0.000 description 7
- 230000009471 action Effects 0.000 description 6
- 239000010720 hydraulic oil Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000007306 turnover Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
Classifications
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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
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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
- B66C13/00—Other constructional features or details
- B66C13/18—Control systems or devices
- B66C13/20—Control systems or devices for non-electric drives
-
- 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
- B66C23/16—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 with jibs supported by columns, e.g. towers having their lower end mounted for slewing movements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
- F15B19/005—Fault detection or monitoring
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Jib Cranes (AREA)
Abstract
The invention belongs to the technical field of tower cranes, and particularly relates to a tower crane jacking device and a hydraulic control system, wherein the tower crane jacking device comprises a jacking sleeve frame, a jacking oil cylinder and an auxiliary oil cylinder, one end of the jacking oil cylinder is hinged to the middle part of a sleeve frame beam on the jacking sleeve frame, the other end of the jacking oil cylinder is hinged to the middle part of the jacking beam, and two ends of the jacking beam are respectively provided with a jacking beam pawl; one end of the auxiliary oil cylinder is hinged to a cylinder barrel of the jacking oil cylinder, the other end of the auxiliary oil cylinder is hinged to the middle of the auxiliary overturning cross beam, and two ends of the auxiliary overturning cross beam are respectively provided with a sleeve frame cross beam pawl which is connected with the jacking sleeve frame in a rotating mode. The invention adopts the auxiliary positioning system controlled by hydraulic pressure, and the auxiliary positioning system is integrated with the jacking hydraulic system of the tower crane in terms of structure and hydraulic pressure principle, thereby meeting the working condition requirements of jacking and descending of the tower crane, jacking beam pawls, sleeving beam pawls and auxiliary positioning of standard joint steps.
Description
Technical Field
The invention belongs to the technical field of tower cranes, and particularly relates to a tower crane jacking device and a hydraulic control system.
Background
The tower crane (tower crane) is a process of continuously increasing or reducing standard joints in the self-lifting process, and a lifting beam pawl which are connected below a lifting oil cylinder, a sleeve frame beam and a sleeve frame beam pawl which are connected above the lifting oil cylinder are required to be continuously and alternately hung into the standard joint steps to form a stressed structure, so that the lifting sleeve frame of the tower crane can climb step by step or descend step by step. In the industry, the process of hanging the lifting beam pawl and the sleeve frame beam pawl into the standard joint pedal is generally realized through manual operation, or a manual direct propulsion mode is adopted, or a mechanical structure is adopted to convert a manual propulsion mode, so that the lifting beam pawl on the lifting beam is more laborious and labor-consuming, the sleeve frame beam pawl or the supporting leg on the sleeve frame beam is positioned below an operation platform of the lifting system, and the sleeve frame beam pawl or the supporting leg on the sleeve frame beam is positioned above the platform and separated, so that the operation of matching by a plurality of people is needed. In particular to a large-tonnage tower crane, the jacking cross beam pawl, the sleeve frame cross beam and the sleeve frame cross beam pawl structure are larger in size and weight, and more operators and operation times are needed.
In the prior art, the auxiliary mechanism is added to realize that the lifting beam pawl and the sleeve frame beam pawl are hung into the standard joint step. As disclosed in chinese patent document with publication number CN216129250U, an auxiliary structure for moving an oil cylinder and a tower crane, the auxiliary structure for moving an oil cylinder includes a support assembly; the thrust plate is provided with a connecting hole, and is rotationally connected with the supporting component through the connecting hole; the thrust rod assembly is connected with the first end of the thrust plate; the roller component is connected with the second end of the thrust plate and is used for abutting against the hydraulic oil cylinder, and the distance between one end of the thrust rod component, which is far away from the thrust plate, and the center of the connecting hole is greater than that between the roller component and the center of the connecting hole. The device designs the oil cylinder movement auxiliary structure by utilizing the lever principle, so that an operator can work more labor-saving, meanwhile, rolling friction is formed between the roller and the hydraulic oil cylinder by arranging the roller, the friction force is smaller, an operator can save more labor when operating, and meanwhile, the damage of the pushing piece to the hydraulic oil cylinder can be reduced.
The technical scheme disclosed in the above Chinese patent document has the following disadvantages or shortcomings:
(1) The lever principle is adopted, and the auxiliary structure is pushed by manpower, so that the jacking hydraulic cylinder of the tower crane and the jacking cross beam connected with the rodless cavity of the jacking hydraulic cylinder are pushed to move horizontally together. The patent structure is operated by human force, the labor intensity is high, and the output force is limited.
(2) The structure of the lifting beam is a movable auxiliary structure for the lifting beam, the lifting beam and the lifting beam are not related to the sleeving frame beam, and the lifting beam and the sleeving frame beam are not integrated.
(3) The auxiliary structure is that the end, which is close to the extending end of the piston rod of the jacking cylinder, is more labor-saving as the radius of rotation of the jacking cylinder can be increased as the end, which is close to the extending end of the piston rod, of the jacking cylinder is more labor-saving. However, as known from industrial tower cranes, the end extending near the piston rod must not be on the same platform as the operating platform of the jacking system, so that the auxiliary structure is not convenient enough.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a jacking device and a hydraulic control system of a tower crane, which adopt a hydraulic control auxiliary positioning system, wherein the auxiliary positioning system is integrated with a jacking hydraulic system of the tower crane in terms of structure and hydraulic principle, and meets the working condition requirements of jacking and descending of the tower crane, and auxiliary positioning of a jacking beam pawl, a sleeve frame beam pawl and a standard section step.
The invention is realized by the following technical scheme: a tower crane jacking apparatus comprising:
jacking the sleeve frame;
one end of the jacking cylinder is hinged to the middle part of the upper sleeve frame cross beam of the jacking sleeve frame, the other end of the jacking cylinder is hinged to the middle part of the jacking cross beam, and jacking cross beam pawls are respectively arranged at two ends of the jacking cross beam; and
one end of the auxiliary oil cylinder is hinged to the cylinder barrel of the jacking oil cylinder, the other end of the auxiliary oil cylinder is hinged to the middle of the auxiliary overturning cross beam, and sleeve frame cross beam pawls are respectively arranged at two ends of the auxiliary overturning cross beam and are in rotary connection with the jacking sleeve frame.
In some embodiments, the bottom of the jacking cylinder is hinged with the sleeve frame cross beam, and the piston rod of the jacking cylinder is hinged with the jacking cross beam.
In some embodiments, the auxiliary flip beam and the holster beam pawl are bolted.
In some embodiments, the jacking beam guard rail is arranged on the sleeve frame beam to protect the jacking beam.
The invention also provides a hydraulic control system, which comprises an operation control valve group and the tower crane jacking device;
the operation control valve group comprises a first reversing valve, a second reversing valve and a third reversing valve;
the oil inlet of the first reversing valve is connected with an oil supply way, the first working oil port of the first reversing valve is connected with the oil inlet of the second reversing valve, and the second working oil port of the first reversing valve is connected with the oil inlet of the third reversing valve;
the first working oil port of the second reversing valve is connected with a rodless cavity of a jacking oil cylinder in the jacking device of the tower crane, and the second working oil port of the second reversing valve is connected with a rod cavity of the jacking oil cylinder;
the first working oil port of the third reversing valve is connected with a rodless cavity of an auxiliary oil cylinder in the jacking device of the tower crane, and the second working oil port of the third reversing valve is connected with a rod cavity of the auxiliary oil cylinder.
In some embodiments, a bidirectional balance valve is arranged between the first working oil port of the second reversing valve, the second working oil port of the second reversing valve and the jacking cylinder.
In some embodiments, a stacked one-way throttle valve is disposed between the third reversing valve and the auxiliary cylinder.
In some embodiments, the first, second and third reversing valves are all manually operated valves.
The beneficial effects of the invention are as follows: (1) The lifting cylinder and the auxiliary cylinder are integrally designed, and a telescopic overturning mixed linkage mechanism consisting of the lifting cylinder, the lifting beam, the auxiliary cylinder and the auxiliary overturning beam is used for realizing overturning of the auxiliary overturning beam, overturning of the lifting beam and up-and-down movement of the lifting beam.
(2) The hydraulic system is integrally designed with a lifting and auxiliary positioning control loop, so that the integrated control of the lifting oil cylinder and the auxiliary oil cylinder is realized. The hydraulic system consists of a lifting hydraulic system pump station, an operation control valve group, a lifting oil cylinder, an auxiliary oil cylinder and the like. The operation control valve group consists of an overflow valve, a one-way valve, a pressure gauge, a first reversing valve, a second reversing valve, a third reversing valve, a superposition overflow valve and a superposition one-way throttle valve. The hydraulic integrated control principle of jacking and descending of the tower crane, auxiliary positioning of the sleeve frame cross beam and the sleeve frame cross beam pawl, auxiliary positioning of the jacking cross beam and the jacking cross beam pawl is realized, and the hydraulic integrated control principle has the functions of load balancing and locking, auxiliary positioning speed control and auxiliary locking.
(3) The operation of the lifting hydraulic system pump station and the auxiliary oil cylinder are all positioned on the same working platform, so that the operation, the observation, the installation and the maintenance are more convenient.
Drawings
FIG. 1 is a simplified schematic diagram of the structure of the present invention;
FIG. 2 is a schematic illustration of the invention applied to a tower crane;
FIG. 3 is a schematic diagram of a hydraulic control system of the present invention;
in the figure, 1, tower crane standard section, 2, jacking sleeve frame, 3, jacking cross beam, 4, jacking oil cylinder, 5, auxiliary oil cylinder, 6, jacking hydraulic system pump station, 7, auxiliary overturning cross beam, 8, sleeve frame cross beam pawl, 9, jacking cross beam pawl, 10, standard section step, 11, jacking cross beam guardrail, 12, sleeve frame cross beam, 100, operation control valve group, 2.1, overflow valve, 2.2, check valve, 2.3, manometer, 2.4, first reversing valve, 2.5, second reversing valve, 2.6, third reversing valve, 2.7, stacked overflow valve, 2.8 and stacked one-way throttle valve.
Description of the embodiments
The invention is further described below with reference to the drawings and examples.
As shown in fig. 1 and 2, a jacking device of a tower crane comprises a jacking sleeve frame 2, a jacking cylinder 4 and an auxiliary cylinder 5. Wherein the jacking sleeve frame 2 is used as a basic jacking device,
the cylinder bottom of the jacking cylinder 4 is hinged to the middle of a sleeve frame beam 12 on the jacking sleeve frame 2 through a pin shaft, a piston rod of the jacking cylinder 4 is hinged to the middle of the jacking beam 3 through a pin shaft, and jacking beam pawls 9 are respectively arranged at two ends of the jacking beam 3.
The cylinder barrel of the jacking cylinder 4 is provided with an ear plate for connecting the auxiliary cylinder 5, the cylinder bottom of the auxiliary cylinder 5 is hinged on the cylinder barrel of the jacking cylinder 4 through a pin shaft, a piston rod of the jacking cylinder 4 is hinged with the middle part of the auxiliary overturning cross beam 7 through a pin shaft, two ends of the auxiliary overturning cross beam 7 are respectively provided with a sleeve frame cross beam pawl 8, the auxiliary overturning cross beam 7 is fixed with the sleeve frame cross beam pawl 8 through a bolt, and the sleeve frame cross beam pawl 8 is rotationally connected with the jacking sleeve frame 2 through a pin shaft.
The technical scheme is that the telescopic overturning mixed linkage mechanism is composed of the jacking cylinder 4, the jacking cross beam 3, the auxiliary cylinder 5 and the auxiliary overturning cross beam 7, so that the overturning of the auxiliary overturning cross beam 7 and the overturning of the jacking cross beam 3 are realized, and the jacking cross beam 3 moves up and down.
The auxiliary overturning cross beam 7 overturns: under the working condition that jacking beam pawls 9 on two sides of a jacking beam 3 are hung into standard joint marks 10 on a standard joint 1 of the tower crane, after a sleeve frame beam pawl 8 on two sides of an auxiliary overturning beam 7 is staggered with the standard joint marks 10 (the standard joint marks 10 are long pieces and are vertically welded on the standard joint 1 of the tower crane, U-shaped clamping grooves are formed in the upper end and the lower end of the standard joint marks 10, when the sleeve frame beam pawl 9 is clamped into the clamping grooves of the standard joint marks 10, the sleeve frame beam pawl 9 and the standard joint marks 10 are hung in, and in a hanging state, the auxiliary cylinder 5 does telescopic action and can not drive the auxiliary overturning beam 7 to drive the sleeve frame beam pawl 9 to overturn, and only when the sleeve frame beam pawl 9 is in a clamping groove state separated from the standard joint marks 10, the auxiliary cylinder 5 can drive the sleeve frame beam pawl 9 to overturn along with the overturning of the auxiliary overturning beam 7, and the auxiliary overturning beam 7 and the sleeve frame beam pawl 8 rotate around a hinging point between the auxiliary cylinder 5 and the auxiliary overturning beam 7. The auxiliary oil cylinder 5 and the auxiliary overturning cross beam 7 form an upper overturning mechanism, and the upper overturning mechanism realizes the hanging or the disconnection of the sleeve frame cross beam pawl 8 and the standard joint step 10.
The jacking beam 3 is turned over: under the working condition that the sleeve frame beam pawls 8 on two sides of the auxiliary overturning beam 7 are hung into the standard joint steps 10 on the standard joint 1 of the tower crane, after the jacking beam pawls 9 on two sides of the jacking beam 3 are staggered with the standard joint steps 10 (the staggered working principle is the same as that of the sleeve frame beam pawls 8 and the standard joint steps 10 at the moment), the auxiliary oil cylinder 5 performs telescopic action, and the jacking oil cylinder 4 and the jacking beam 3 rotate around the hinging point between the jacking oil cylinder 4 and the sleeve frame beam 12. The jacking cylinder 4 and the jacking beam 3 form a lower turnover mechanism, and the lower turnover mechanism realizes the hanging or the disconnection of the jacking beam pawl 9 and the standard joint step 10.
Based on the technical scheme, the working principle of the invention is as follows: when the jacking sleeve frame 2 needs to be jacked (namely, when the tower crane is added with a standard section of the tower crane), a piston rod of the jacking cylinder 4 before jacking is in a retracted state, the jacking beam pawl 9 and the standard section step 10 are in a hanging state, and the sleeve frame beam pawl 8 and the standard section step 10 are in a disconnecting state. The piston rod of the jacking cylinder 4 stretches out, the jacking sleeve frame 2 is jacked upwards by taking the jacking beam pawl 9 and the jacking beam 3 as supporting points, after the jacking sleeve frame 2 is jacked in place, the auxiliary cylinder 5 is controlled to act so that the sleeve frame beam pawl 8 and the standard section step 10 enter a hanging state, and then the jacking beam pawl 9 and the standard section step 10 are separated through the action of the auxiliary cylinder 5. The piston rod of the jacking cylinder 4 is retracted, and the auxiliary cylinder 5 is controlled again to act so that the jacking beam pawl 9 and the standard joint pedal 10 are in a hanging state, and the sleeve frame beam pawl 8 and the standard joint pedal 10 are in a disconnecting state. Waiting for the next jacking operation.
When the jacking sleeve frame 2 needs to be lowered (namely when the tower crane subtracts a standard section of the tower crane), before lowering, the sleeve frame beam pawl 8 and the standard section step 10 are controlled to be in a hanging state, the jacking beam pawl 9 and the standard section step 10 are controlled to be in a disengaging state, a piston rod of the jacking cylinder 4 in a retracting state is operated to extend, after the piston rod of the jacking cylinder 4 extends in place, the jacking beam pawl 9 and the standard section step 10 are made to enter into a hanging state, then the sleeve frame beam pawl 8 and the standard section step 10 are separated, and the piston rod of the jacking cylinder 4 is retracted again, so that the lowering of the jacking sleeve frame 2 can be realized. Repeating the above actions to finish the dismantling operation of the tower crane.
The jacking beam 3 moves up and down: the piston rod of the jacking cylinder 4 stretches to drive the jacking cross beam 3 to move up and down.
In some embodiments, the lifting beam guard rail 11 for protecting the lifting beam 3 is provided on the frame beam 12.
As shown in fig. 3, the present invention also provides a hydraulic control system, which includes the operation control valve group 100 and the tower crane jacking device as described above.
The operation control valve group 100 comprises a first reversing valve 2.4, a second reversing valve 2.5 and a third reversing valve 2.6, and the first reversing valve 2.4, the second reversing valve 2.5 and the third reversing valve 2.6 are three-position four-way manual operation valves.
The oil inlet of the first reversing valve 2.4 is connected with an oil supply way, and the oil return opening of the first reversing valve 2.4 is connected with an oil return way. Specifically, an oil inlet of the first reversing valve 2.4 and an oil return port of the first reversing valve 2.4 are connected to a lifting hydraulic system pump station 6 arranged on the platform. The first working oil port of the first reversing valve 2.4 is connected with the oil inlet of the second reversing valve 2.5, and the second working oil port of the first reversing valve 2.4 is connected with the oil inlet of the third reversing valve 2.6.
The first working oil port of the second reversing valve 2.5 is connected with a rodless cavity of the jacking cylinder 4 in the jacking device of the tower crane, and the second working oil port of the second reversing valve 2.5 is connected with a rod cavity of the jacking cylinder 4.
The first working oil port of the third reversing valve 2.6 is connected with a rodless cavity of the auxiliary oil cylinder 5 in the tower crane jacking device, and the second working oil port of the third reversing valve 2.6 is connected with a rod cavity of the auxiliary oil cylinder 5.
When the first reversing valve 2.4 is at the left position, the hydraulic control system is used for jacking the action of the oil cylinder 4; the hydraulic control system is used for the actuation of the auxiliary cylinder 5 when the first reversing valve 2.4 is in the right position.
When the second reversing valve 2.5 is at the left position, an oil inlet of the second reversing valve 2.5 is communicated with a first working oil port of the second reversing valve 2.5, and a second working oil port of the second reversing valve 2.5 is communicated with an oil return port of the second reversing valve 2.5. When the second reversing valve 2.5 is at the right position, an oil inlet of the second reversing valve 2.5 is communicated with a second working oil port of the second reversing valve 2.5, and a first working oil port of the second reversing valve 2.5 is communicated with an oil return port of the second reversing valve 2.5.
When the third reversing valve 2.6 is at the left position, an oil inlet of the third reversing valve 2.6 is communicated with a first working oil port of the third reversing valve 2.6, and a second working oil port of the third reversing valve 2.6 is communicated with an oil return port of the third reversing valve 2.6. When the third reversing valve 2.6 is at the right position, an oil inlet of the third reversing valve 2.6 is communicated with a second working oil port of the third reversing valve 2.6, and a first working oil port of the third reversing valve 2.6 is communicated with an oil return port of the third reversing valve 2.6.
Based on the hydraulic control system, the control principle of the invention is as follows:
the cradle beam 12 assists in seating: under the working condition that lifting beam pawls 9 on two sides of a lifting beam 3 are hung into standard joint steps 10 on a standard joint 1 of the tower crane, firstly, a first reversing valve 2.4 is operated to be reversed to the right position, then a third reversing valve 2.6 is operated to be reversed to the left position, hydraulic oil enters a rodless cavity of an auxiliary oil cylinder 5 to realize the extension of the auxiliary oil cylinder 5, and then an auxiliary overturning beam 7 and a sleeve frame beam pawl 8 are driven to overturn towards the inner side of the lifting sleeve frame 2 around a hinging point of the auxiliary oil cylinder 5 and the auxiliary overturning beam 7 until the sleeve frame beam pawl 8 is abutted against the standard joint steps 10. 2. The first reversing valve 2.4 is operated to be reversed to the left position, the second reversing valve 2.5 is operated to be right position, hydraulic oil enters a rod cavity of the jacking cylinder 4 to enable a piston rod of the jacking cylinder 4 to retract until the sleeve frame beam pawl 8 is hung into the standard joint step 10, and the auxiliary positioning of the sleeve frame beam 12 is completed.
When the jacking sleeve frame 2 needs to be jacked, the jacking cross beam 3 assists in positioning: under the working condition that the sleeve frame beam pawls 8 on two sides of the auxiliary overturning beam 7 are hung into the standard joint steps 10 on the standard joint 1 of the tower crane, the first reversing valve 2.4 is operated to be reversed to the left position, and the second reversing valve 2.5 is operated to the right position to enable the piston rod of the jacking cylinder 4 to retract for a certain distance, so that the jacking beam pawls 9 are staggered with the standard joint steps 10. 2. The first reversing valve 2.4 is switched to the right position, the third reversing valve 2.6 is operated to the right position, the auxiliary oil cylinder 5 is retracted, and at the moment, the lifting oil cylinder 4 drives the lifting beam 3 and the lifting beam pawl 9 to turn around the hinging point of the lifting beam 3 and the sleeve frame beam 12 to the outer side of the lifting sleeve frame 2 because the sleeve frame beam pawl 8 is hung in the standard joint step 10, so that the lifting beam pawl 9 is completely separated from the standard joint step 10. 3. The first reversing valve 2.4 is switched to the left position, the second reversing valve 2.5 is operated to the right position, the piston rod of the jacking cylinder 4 is retracted, and the jacking cross beam 3 and the jacking cross beam pawl 9 reach the next standard joint step 10. 4. The first reversing valve 2.4 is switched to the right position, the third reversing valve 2.6 is operated to reverse to the left position, the auxiliary oil cylinder 5 extends out, and the jacking oil cylinder 4 drives the jacking cross beam 3 and the jacking cross beam pawl 9 to turn around the hinging point of the jacking cross beam 3 and the sleeve cross beam 12 to the inner side of the jacking sleeve frame 2, so that the jacking cross beam pawl 9 is abutted against the standard joint step 10. 5. And switching the first reversing valve 2.4 to the left position, and operating the second reversing valve 2.5 to enable the piston rod of the jacking cylinder 4 to extend outwards until the jacking beam pawl 9 is completely hung into the standard joint step 10, so that the auxiliary positioning of the jacking beam 3 is completed.
When the lifting frame 2 needs to be lowered, the basic working principle of the auxiliary positioning of the lifting beam 3 is similar to that of the lifting frame 2 when the lifting frame needs to be lifted, and the auxiliary positioning of the lifting beam 3 can be realized by a person skilled in the art in combination with the above technical scheme, which is not described here.
In order to ensure the working stability of the hydraulic control system, in some embodiments, a bidirectional balance valve is arranged between the first working oil port of the second reversing valve 2.5, the second working oil port of the second reversing valve 2.5 and the jacking cylinder 4; the design of the bidirectional balance valve realizes load balance and locking in the process of lifting the sleeve frame 2 by heavy load and lifting the lifting beam 3 by no load, prevents stall or cylinder slipping, and is safe and reliable. A superimposed one-way throttle valve 2.8 is arranged between the third reversing valve 2.6 and the auxiliary oil cylinder 5; the design of the overlapped one-way throttle valve 2.8 can adjust the oil inlet and return flow of the auxiliary oil cylinder 5 and control the running speed of the auxiliary oil cylinder 5. 2. When the jacking cylinder 4 acts, the auxiliary cylinder 5 does not act, and at the moment, the overlapped one-way throttle valve 2.8 is closed, so that the auxiliary cylinder 5 is locked, the auxiliary cylinder 5 is prevented from sliding downwards due to leakage of the middle position of the reversing valve, and the requirement of the auxiliary overturning beam on-site operation working condition is met. The operation control valve group 100 further comprises an overflow valve 2.1, a one-way valve 2.2 which is connected to an oil inlet of the first reversing valve 2.4 in a one-way by the jacking hydraulic system pump station 6, a pressure gauge 2.3 for monitoring the pressure of the hydraulic control system, and a superposition overflow valve 2.7 which is arranged at a first working oil port of the third reversing valve 2.6 and a second working oil port of the third reversing valve 2.6, wherein the superposition overflow valve 2.7 realizes safety protection during jacking and auxiliary actions.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent variation and modification made to the above embodiments according to the technical principles of the present invention are within the scope of the technical solutions of the present invention.
Claims (8)
1. The utility model provides a tower crane jacking device which characterized in that includes:
jacking the sleeve frame (2);
one end of the jacking cylinder (4) is hinged to the middle part of a sleeve frame beam (12) on the jacking sleeve frame (2), the other end of the jacking cylinder is hinged to the middle part of the jacking beam (3), and jacking beam pawls (9) are respectively arranged at two ends of the jacking beam (3); and
one end of the auxiliary oil cylinder (5) is hinged to a cylinder barrel of the jacking oil cylinder (4), the other end of the auxiliary oil cylinder is hinged to the middle of the auxiliary overturning cross beam (7), and sleeve frame cross beam pawls (8) are respectively arranged at two ends of the auxiliary overturning cross beam (7), and the sleeve frame cross beam pawls (8) are rotationally connected with the jacking sleeve frame (2).
2. The tower crane jacking device according to claim 1, wherein: the bottom of the jacking cylinder (4) is hinged with the sleeve frame cross beam (12), and the piston rod of the jacking cylinder (4) is hinged with the jacking cross beam (3).
3. The tower crane jacking device according to claim 1, wherein: the auxiliary overturning cross beam (7) and the sleeve frame cross beam pawl (8) are fixed through bolts.
4. The tower crane jacking device according to claim 1, wherein: the jacking cross beam guardrail (11) for protecting the jacking cross beam (3) is arranged on the sleeve frame cross beam (12).
5. A hydraulic control system, characterized by: comprising an operating control valve group (100) and a tower crane jacking device according to any one of claims 1 to 4;
the operation control valve group (100) comprises a first reversing valve (2.4), a second reversing valve (2.5) and a third reversing valve (2.6);
the oil inlet of the first reversing valve (2.4) is connected with an oil supply circuit, the first working oil port of the first reversing valve (2.4) is connected with the oil inlet of the second reversing valve (2.5), and the second working oil port of the first reversing valve (2.4) is connected with the oil inlet of the third reversing valve (2.6);
the first working oil port of the second reversing valve (2.5) is connected with a rodless cavity of a jacking oil cylinder (4) in the jacking device of the tower crane, and the second working oil port of the second reversing valve (2.5) is connected with a rod cavity of the jacking oil cylinder (4);
the first working oil port of the third reversing valve (2.6) is connected with a rodless cavity of an auxiliary oil cylinder (5) in the jacking device of the tower crane, and the second working oil port of the third reversing valve (2.6) is connected with a rod cavity of the auxiliary oil cylinder (5).
6. The hydraulic control system of claim 5, wherein: and a bidirectional balance valve is arranged between the first working oil port of the second reversing valve (2.5), the second working oil port of the second reversing valve (2.5) and the jacking cylinder (4).
7. The hydraulic control system of claim 5, wherein: a superimposed one-way throttle valve (2.8) is arranged between the third reversing valve (2.6) and the auxiliary oil cylinder (5).
8. The hydraulic control system of claim 5, wherein: the first reversing valve (2.4), the second reversing valve (2.5) and the third reversing valve (2.6) are all manually operated valves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310048284.0A CN116588831A (en) | 2023-01-31 | 2023-01-31 | Jacking device of tower crane and hydraulic control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310048284.0A CN116588831A (en) | 2023-01-31 | 2023-01-31 | Jacking device of tower crane and hydraulic control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116588831A true CN116588831A (en) | 2023-08-15 |
Family
ID=87594302
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310048284.0A Pending CN116588831A (en) | 2023-01-31 | 2023-01-31 | Jacking device of tower crane and hydraulic control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116588831A (en) |
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2023
- 2023-01-31 CN CN202310048284.0A patent/CN116588831A/en active Pending
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