CN204213077U - Ratchet wheel hydraulic control system and crane with same - Google Patents
Ratchet wheel hydraulic control system and crane with same Download PDFInfo
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- CN204213077U CN204213077U CN201420581643.5U CN201420581643U CN204213077U CN 204213077 U CN204213077 U CN 204213077U CN 201420581643 U CN201420581643 U CN 201420581643U CN 204213077 U CN204213077 U CN 204213077U
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- 239000003921 oil Substances 0.000 claims abstract description 149
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 5
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- 239000002828 fuel tank Substances 0.000 claims description 10
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- 239000000446 fuel Substances 0.000 description 2
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Abstract
The utility model provides a ratchet hydraulic control system and have its hoist. The ratchet wheel hydraulic control system comprises a ratchet wheel tensioning master control valve, at least two ratchet wheel tensioning oil cylinders which are arranged in parallel, wherein the ratchet wheel tensioning master control valve is respectively connected with a rod cavity and a rodless cavity of the ratchet wheel tensioning oil cylinders, the ratchet wheel hydraulic control system further comprises a ratchet wheel tensioning control unit, the ratchet wheel tensioning control unit comprises a ratchet wheel tensioning structure, the ratchet wheel tensioning structure is arranged between the ratchet wheel tensioning master control valve and the rodless cavity of the ratchet wheel tensioning oil cylinders, the ratchet wheel tensioning structure comprises a first control valve, the first control valve is provided with a first station and a second station, when the first control valve is located at the first station, hydraulic oil in the rodless cavity of the ratchet wheel tensioning oil cylinders directly flows into an oil tank, and when the first control valve is located at the second station, the rodless cavity of the ratchet wheel tensioning oil cylinders is connected with the ratchet wheel tensioning. The ratchet tensioning oil cylinder of the ratchet hydraulic control system can realize independent action and has a good control effect.
Description
Technical field
The utility model relates to hoist supplementary structure field, in particular to a kind of ratchet hydraulic control system and the hoist with it.
Background technique
Along with the development of truck crane, lifting capacity requirement is more and more higher, shear leg is more and more longer.In order to improve the initial weight of truck crane and improve the stressing conditions of arm, reduce the amount of deflection of arm, surpass apply more and more extensive.And the reliability of ratchet lock device ensures to have surpassed the stability of operation and the necessary condition of Security, therefore how to improve the fine motion of ratchet lock device hydraulic control system, stability and reliability and become an important research topic.
One, existing ratchet lock device is at lock state, and ratchet lock-off oil cylinder is full reduced, and rely on deadweight and spring tension to realize locking, during lock-off, ratchet lock-off oil cylinder stretches out.And in order to prevent ratchet in rotation process, ratchet lock-off oil cylinder pulls ratchet tensioning hydro-cylinder to be caused ratchet tensioning hydro-cylinder to be out of shape, damage ratchet, ratchet lock-off oil cylinder must be in servo-actuated state.Ratchet lock-off oil cylinder two chamber is connected with system oil return road.
Two, existing ratchet lock device hydraulic system adopts throttle grverning and switch valve control mode; In the actions such as ratchet elevator retractable rope, elevator pretension, ratchet tensioning, ratchet lock, need different speed.Existing system controls to meet system requirements by multiple throttle grverning valve.
Three, ratchet tensioning action is controlled by a slice switch valve.
The existing locking device hydraulic system that surpassed has following shortcoming:
1, the existing layout pattern having surpassed locking device is adopted, when ratchet lock, lock-off oil cylinder is in quick condition, easily by the impact of return oil pressure, because ratchet lock-off oil cylinder adopts single-acting cylinder, rodless cavity, rod chamber two chamber active area are not identical, the power that lock-off oil cylinder two chamber is subject to is different, causes ratchet lock-off oil cylinder to be stretched towards the dangerous direction of lock-off, wants the impact overcoming return oil pressure, the spring tension realizing locking needs is larger, increases design difficulty.
2, hydraulic system complexity, governor control characteristics and fretting performance are poor, and action is steady, reversing impact is large.
3, ratchet tensioning action can not realize single action, and when two tensioning hydro-cylinders because load resistance, return oil pressure difference cause two oil cylinders to stretch pressure difference, the pressure of one of them tensioning hydro-cylinder first reaches setting value, and an other tensioning hydro-cylinder cannot realize tensioning.
Model utility content
The utility model aims to provide a kind of ratchet hydraulic control system and has its hoist, and the ratchet tensioning hydro-cylinder controlled to solve ratchet hydraulic control system of the prior art can not realize single movement, causes the problem of control effects difference.
To achieve these goals, according to an aspect of the present utility model, provide a kind of ratchet hydraulic control system, at least two the ratchet tensioning hydro-cylinders comprising ratchet tensioning master control valve and be arranged in parallel, ratchet tensioning master control valve is connected with the rod chamber of ratchet tensioning hydro-cylinder and rodless cavity respectively, ratchet hydraulic control system also comprises ratchet tensioning control unit, ratchet tensioning control unit comprises ratchet tension structure, ratchet tension structure is arranged between ratchet tensioning master control valve and the rodless cavity of ratchet tensioning hydro-cylinder, ratchet tension structure comprises the first control valve, first control valve has the first station and the second station, when first control valve is in the first station, hydraulic oil in the rodless cavity of ratchet tensioning hydro-cylinder flows directly into fuel tank, when first control valve is in the second station, the rodless cavity of ratchet tensioning hydro-cylinder is connected with ratchet tensioning master control valve.
Further, first control valve has the first hydraulic fluid port, the second hydraulic fluid port and the 3rd hydraulic fluid port, first hydraulic fluid port is connected with ratchet tensioning master control valve, and the second hydraulic fluid port is connected with the rodless cavity of ratchet tensioning hydro-cylinder, and the 3rd hydraulic fluid port is connected with fuel tank, when first control valve is in the first station, first hydraulic fluid port cut-off, the second hydraulic fluid port is communicated with the 3rd hydraulic fluid port, when the first control valve is in the second station, first hydraulic fluid port is communicated with the second hydraulic fluid port, the 3rd hydraulic fluid port cut-off.
Further, ratchet tension structure also comprises the first one-way valve, and the first one-way valve is connected between the second hydraulic fluid port of the first control valve and the rodless cavity of ratchet tensioning hydro-cylinder, and the first one-way valve has the control mouth be connected with the rod chamber of ratchet tensioning hydro-cylinder.
Further, ratchet tensioning control unit also comprises ratchet tensioning pressure detector, and ratchet tensioning pressure detector is arranged on the pipeline that is connected with the rodless cavity of ratchet tensioning hydro-cylinder, and detects the pressure of the rodless cavity of ratchet tensioning hydro-cylinder.
Further, the first control valve is Solenoid ball valve, and when the electromagnet of Solenoid ball valve obtains electric, the first control valve is in the second station.
Further, ratchet tensioning master control valve has the first station, second station and intermediate stations, ratchet tensioning master control valve mediates station and the first control valve when being in the second station, the rod chamber of ratchet tensioning hydro-cylinder is all connected with return tube with rodless cavity, ratchet tensioning master control valve be in the first station and the first control valve is in the second station time, oil inlet pipe is connected with the rod chamber of ratchet tensioning hydro-cylinder by ratchet tensioning master control valve, return tube is connected with the rodless cavity of ratchet tensioning hydro-cylinder by ratchet tensioning master control valve, ratchet tensioning master control valve be in the second station and the first control valve is in the second station time, oil inlet pipe is connected with the rodless cavity of ratchet tensioning hydro-cylinder by ratchet tensioning master control valve, return tube is connected with the rod chamber of ratchet tensioning hydro-cylinder by ratchet tensioning master control valve.
Further, ratchet tensioning master control valve has the first hydraulic fluid port, second hydraulic fluid port, 3rd hydraulic fluid port and the 4th hydraulic fluid port, first hydraulic fluid port is connected with oil inlet pipe, second hydraulic fluid port is connected with return tube, 3rd hydraulic fluid port is connected with the rodless cavity of ratchet tensioning hydro-cylinder, 4th hydraulic fluid port is connected with the rod chamber of ratchet tensioning hydro-cylinder, when ratchet tensioning master control valve is in the first station, first hydraulic fluid port of ratchet tensioning master control valve is communicated with the 4th hydraulic fluid port, second hydraulic fluid port of ratchet tensioning master control valve is communicated with the 3rd hydraulic fluid port, when ratchet tensioning master control valve is in the second station, first hydraulic fluid port of ratchet tensioning master control valve is communicated with the 3rd hydraulic fluid port, second hydraulic fluid port of ratchet tensioning master control valve is communicated with the 4th hydraulic fluid port, ratchet tensioning master control valve mediate station time, first hydraulic fluid port cut-off of ratchet tensioning master control valve, second hydraulic fluid port is communicated with the 4th hydraulic fluid port with the 3rd hydraulic fluid port respectively.
Further, ratchet hydraulic control system also comprises ratchet lock-off control unit, ratchet lock-off control unit and ratchet tensioning control unit are connected in parallel on oil inlet pipe and return tube, ratchet lock-off control unit comprises ratchet lock-off master control valve, ratchet lock-off master control valve is connected with the rod chamber of ratchet lock-off oil cylinder and rodless cavity respectively, ratchet lock-off master control valve has the first station, second station and intermediate stations, when ratchet lock-off master control valve is in the first station, oil inlet pipe is connected with the rod chamber of ratchet lock-off oil cylinder, return tube is connected with ratchet lock-off oil cylinder rodless cavity, when ratchet lock-off master control valve is in the second station, oil inlet pipe is connected with the rodless cavity of ratchet lock-off oil cylinder, return tube is connected with the rod chamber of ratchet lock-off oil cylinder, ratchet lock-off master control valve mediate station time, return tube is connected with the rod chamber of ratchet lock-off oil cylinder and rodless cavity respectively, ratchet hydraulic control system also comprises elevator withdrawing rope control unit, elevator withdrawing rope control unit, ratchet lock-off control unit and ratchet tensioning control unit are all connected in parallel on return tube and oil inlet pipe, elevator withdrawing rope control unit comprises elevator withdrawing rope master control valve, withdrawing rope master control valve is connected with oil hydraulic motor, withdrawing rope master control valve has the first station, second station and intermediate stations, when withdrawing rope master control valve is in the first station, oil inlet pipe is connected with the first hydraulic fluid port of oil hydraulic motor, return tube is connected with the second hydraulic fluid port of oil hydraulic motor, oil hydraulic motor reverses, when withdrawing rope master control valve is in the second station, oil inlet pipe is connected with the second hydraulic fluid port of oil hydraulic motor, return tube is connected with the first hydraulic fluid port of oil hydraulic motor, oil hydraulic motor rotates forward, withdrawing rope master control valve mediate station time, oil hydraulic motor and ending between oil inlet pipe and return tube.
Further, ratchet hydraulic control system also comprises safety overflow unit, safety overflow unit is arranged between oil inlet pipe and fuel tank, and safety overflow unit comprises safety overflow valve and rope closing pressure detector, and rope closing pressure detector is arranged between safety overflow valve and oil inlet pipe.
According to another aspect of the present utility model, provide a kind of hoist, comprise super lifting device, super lifting device comprises elevator, oil hydraulic motor, ratchet mechanism and ratchet hydraulic control system, ratchet mechanism comprises ratchet, ratchet tensioning hydro-cylinder and ratchet lock-off oil cylinder, ratchet hydraulic control system is connected with oil hydraulic motor, ratchet tensioning hydro-cylinder and ratchet lock-off oil cylinder respectively, and ratchet hydraulic control system is above-mentioned ratchet hydraulic control system.
Application the technical solution of the utility model, ratchet hydraulic control system comprises ratchet tensioning control unit, at least two ratchet tension structures that ratchet tensioning control unit comprises ratchet tensioning master control valve and is arranged in parallel, ratchet tensioning master control valve is connected with the rod chamber of ratchet tensioning hydro-cylinder and rodless cavity respectively, ratchet tension structure is arranged between ratchet tensioning master control valve and the rodless cavity of ratchet tensioning hydro-cylinder, ratchet tension structure comprises the first control valve, first control valve has the first station and the second station, when first control valve is in the first station, hydraulic oil in the rodless cavity of ratchet tensioning hydro-cylinder flows directly into fuel tank, when first control valve is in the second station, oil-feed in the rodless cavity of ratchet tensioning hydro-cylinder.Because each ratchet tension structure is arranged in parallel, each ratchet tensioning hydro-cylinder is controlled by corresponding first control valve, therefore can control separately each ratchet tensioning hydro-cylinder by regulating the station of each first control valve, realize the single movement of ratchet tensioning hydro-cylinder, realize two ratchet tensioning hydro-cylinders with this and can both realize tensioning, and then raising control effects, avoid due to load resistance, two oil cylinders that cause of return oil pressure difference stretch inconsistent one of them oil cylinder tensioning of causing or another oil cylinder cannot the situation of tensioning.
Accompanying drawing explanation
The accompanying drawing forming a part of the present utility model is used to provide further understanding of the present utility model, and schematic description and description of the present utility model, for explaining the utility model, is not formed improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 shows the control schematic diagram of the ratchet hydraulic control system of embodiment of the present utility model;
Fig. 2 shows the control logic figure of embodiment of the present utility model;
The ratchet lock device that Fig. 3 shows embodiment of the present utility model is in the structural representation of original state;
The ratchet lock device that Fig. 4 shows embodiment of the present utility model is in the structural representation of delocking state; And
The structural representation that the ratchet lock device that Fig. 5 shows embodiment of the present utility model is in the lock state.
Description of reference numerals: 10a, ratchet tensioning hydro-cylinder; 10b, ratchet tensioning hydro-cylinder; 11, ratchet tensioning master control valve; 12, the first control valve; 13, the first one-way valve; 14, ratchet tensioning pressure detector; 20a, ratchet lock-off oil cylinder; 20b, ratchet lock-off oil cylinder; 21, ratchet lock-off master control valve; 30a, oil hydraulic motor; 30b, oil hydraulic motor; 31, elevator withdrawing rope master control valve; 41, safety overflow valve; 42, rope closing pressure detector; 70, ratchet; 80, spring cylinder; 91, oil inlet pipe; 92, return tube.
Embodiment
Hereinafter also describe the utility model in detail with reference to accompanying drawing in conjunction with the embodiments.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.
As shown in Fig. 1 to 5, according to embodiment of the present utility model, at least two ratchet tensioning hydro-cylinder 10a that ratchet hydraulic control system comprises ratchet tensioning master control valve 11 and is arranged in parallel, 10b, ratchet tensioning master control valve 11 respectively with ratchet tensioning hydro-cylinder 10a, the rod chamber of 10b is connected with rodless cavity, ratchet hydraulic control system also comprises ratchet tensioning control unit, ratchet tensioning control unit comprises ratchet tension structure, ratchet tension structure is arranged on ratchet tensioning master control valve 11 and ratchet tensioning hydro-cylinder 10a, between the rodless cavity of 10b, ratchet tension structure comprises the first control valve 12, first control valve 12 has the first station and the second station, when first control valve 12 is in the first station, ratchet tensioning hydro-cylinder 10a, hydraulic oil in the rodless cavity of 10b flows directly into fuel tank, when first control valve 12 is in the second station, ratchet tensioning hydro-cylinder 10a, the rodless cavity of 10b is connected with ratchet tensioning master control valve 11.
Because each ratchet tension structure is arranged in parallel, each ratchet tensioning hydro-cylinder 10a, 10b is controlled by corresponding first control valve 12, therefore can by regulating the station of each first control valve 12 to each ratchet tensioning hydro-cylinder 10a, 10b controls separately, realize ratchet tensioning hydro-cylinder 10a, the single movement of 10b, two ratchet tensioning hydro-cylinder 10a are realized with this, 10b can both realize tensioning, and then raising control effects, avoid due to load resistance, two oil cylinders that cause of return oil pressure difference stretch inconsistent one of them oil cylinder tensioning of causing or another oil cylinder cannot the situation of tensioning.
In the present embodiment, first control valve 12 has the first hydraulic fluid port, the second hydraulic fluid port and the 3rd hydraulic fluid port, first hydraulic fluid port is connected with ratchet tensioning master control valve 11, and the second hydraulic fluid port is connected with the rodless cavity of ratchet tensioning hydro-cylinder 10a, 10b, and the 3rd hydraulic fluid port is connected with fuel tank, when first control valve 12 is in the first station, first hydraulic fluid port cut-off, the second hydraulic fluid port is communicated with the 3rd hydraulic fluid port, when the first control valve 12 is in the second station, first hydraulic fluid port is communicated with the second hydraulic fluid port, the 3rd hydraulic fluid port cut-off.
Preferably, the first control valve 12 is Solenoid ball valve, and when the electromagnet of Solenoid ball valve obtains electric, the first control valve 12 is in the second station.Can the flow direction of hydraulic control oil simply and easily by Solenoid ball valve, to realize the extension and contraction control to ratchet tensioning hydro-cylinder 10a, 10b.Solenoid ball valve controls working position by electromagnet Y9, Y10, fast response time, and is convenient to by electric control system controls, and reduce manual control, automaticity is high.
Preferably, in order to ensure reliability and the Security of ratchet hydraulic control system, ratchet tension structure also comprises the first one-way valve 13, first one-way valve 13 is connected between the second hydraulic fluid port of the first control valve 12 and the rodless cavity of ratchet tensioning hydro-cylinder 10a, 10b, the import of the first one-way valve 13 is connected with the second hydraulic fluid port of the first control valve 12, the outlet of the first one-way valve 13 is connected with the rodless cavity of ratchet tensioning hydro-cylinder 10a, 10b, and the first one-way valve 13 has the control mouth be connected with the rod chamber of ratchet tensioning hydro-cylinder 10a, 10b.First one-way valve 13 can prevent unexpected situation bottom ratchet wheel tensioning hydro-cylinder 10a, 10b leakage of oil, ensures ratchet tensioning hydro-cylinder 10a, 10b security of operation.
In order to coordinate automatical control system, realize automatically controlling, ratchet tensioning control unit also comprises ratchet tensioning pressure detector 14, ratchet tensioning pressure detector 14 is arranged on the pipeline that is connected with the rodless cavity of ratchet tensioning hydro-cylinder 10a, 10b, and detects the pressure of the rodless cavity of ratchet tensioning hydro-cylinder 10a, 10b.
In the present embodiment, ratchet tensioning master control valve 11 is three position four-way electromagnetic valve.Ratchet tensioning master control valve 11 has the first station, second station and intermediate stations, ratchet tensioning master control valve 11 mediates station and the first control valve 12 when being in the second station, ratchet tensioning hydro-cylinder 10a, the rod chamber of 10b is all connected with return tube 92 with rodless cavity, ratchet tensioning master control valve 11 be in the first station and the first control valve 12 is in the second station time, oil inlet pipe 91 is by ratchet tensioning master control valve 11 and ratchet tensioning hydro-cylinder 10a, the rod chamber of 10b connects, return tube 92 is by ratchet tensioning master control valve 11 and ratchet tensioning hydro-cylinder 10a, the rodless cavity of 10b connects, ratchet tensioning master control valve 11 be in the second station and the first control valve 12 is in the second station time, oil inlet pipe 91 is by ratchet tensioning master control valve 11 and ratchet tensioning hydro-cylinder 10a, the rodless cavity of 10b connects, return tube 92 is by ratchet tensioning master control valve 11 and ratchet tensioning hydro-cylinder 10a, the rod chamber of 10b connects.
The flexible of ratchet tensioning hydro-cylinder 10a, 10b can be controlled by the station controlling ratchet tensioning master control valve 11, control simple, convenient.
Wherein, ratchet tensioning master control valve 11 has the first hydraulic fluid port, second hydraulic fluid port, 3rd hydraulic fluid port and the 4th hydraulic fluid port, first hydraulic fluid port is connected with oil inlet pipe 91, second hydraulic fluid port is connected with return tube 92, 3rd hydraulic fluid port and ratchet tensioning hydro-cylinder 10a, the rodless cavity of 10b connects, 4th hydraulic fluid port and ratchet tensioning hydro-cylinder 10a, the rod chamber of 10b connects, when ratchet tensioning master control valve 11 is in the first station, first hydraulic fluid port of ratchet tensioning master control valve 11 is communicated with the 4th hydraulic fluid port, second hydraulic fluid port of ratchet tensioning master control valve 11 is communicated with the 3rd hydraulic fluid port, when ratchet tensioning master control valve 11 is in the second station, first hydraulic fluid port of ratchet tensioning master control valve 11 is communicated with the 3rd hydraulic fluid port, second hydraulic fluid port of ratchet tensioning master control valve 11 is communicated with the 4th hydraulic fluid port, ratchet tensioning master control valve 11 mediate station time, first hydraulic fluid port cut-off of ratchet tensioning master control valve 11, second hydraulic fluid port is communicated with the 4th hydraulic fluid port with the 3rd hydraulic fluid port respectively.
Ratchet hydraulic control system also comprises ratchet lock-off control unit, ratchet lock-off control unit and ratchet tensioning control unit are connected in parallel on oil inlet pipe 91 and return tube 92, ratchet lock-off control unit comprises ratchet lock-off master control valve 21, ratchet lock-off master control valve 21 respectively with ratchet lock-off oil cylinder 20a, the rod chamber of 20b is connected with rodless cavity, ratchet lock-off master control valve 21 has the first station, second station and intermediate stations, when ratchet lock-off master control valve 21 is in the first station, oil inlet pipe 91 and ratchet lock-off oil cylinder 20a, the rod chamber of 20b connects, return tube 92 and ratchet lock-off oil cylinder 20a, 20b rodless cavity connects, when ratchet lock-off master control valve 21 is in the second station, oil inlet pipe 91 and ratchet lock-off oil cylinder 20a, the rodless cavity of 20b connects, return tube 92 and ratchet lock-off oil cylinder 20a, the rod chamber of 20b connects, ratchet lock-off master control valve 21 mediate station time, return tube 92 respectively with ratchet lock-off oil cylinder 20a, the rod chamber of 20b is connected with rodless cavity.
Ratchet lock-off control unit controls ratchet lock-off oil cylinder 20a, 20b, and control structure is simple and accurate.
Ratchet lock-off master control valve 21 is three position four-way electromagnetic valve, ratchet hydraulic control system also comprises elevator withdrawing rope control unit, elevator withdrawing rope control unit, ratchet lock-off control unit ratchet tensioning control unit is all connected in parallel on return tube 92 and oil inlet pipe 91, elevator withdrawing rope control unit comprises elevator withdrawing rope master control valve 31, withdrawing rope master control valve and oil hydraulic motor 30a, 30b connects, withdrawing rope master control valve has the first station, second station and intermediate stations, when withdrawing rope master control valve is in the first station, oil inlet pipe 91 and oil hydraulic motor 30a, first hydraulic fluid port of 30b connects, return tube 92 and oil hydraulic motor 30a, second hydraulic fluid port of 30b connects, oil hydraulic motor 30a, 30b reverses, when withdrawing rope master control valve is in the second station, oil inlet pipe 91 and oil hydraulic motor 30a, second hydraulic fluid port of 30b connects, return tube 92 and oil hydraulic motor 30a, first hydraulic fluid port of 30b connects, oil hydraulic motor 30a, 30b rotates forward, withdrawing rope master control valve mediate station time, oil hydraulic motor 30a, 30b and ending between oil inlet pipe 91 and return tube 92.
In order to ensure ratchet hydraulic control system security of operation, ratchet hydraulic control system also comprises safety overflow unit, safety overflow unit is arranged between oil inlet pipe 91 and fuel tank, safety overflow unit comprises safety overflow valve 41 and rope closing pressure detector 42, and rope closing pressure detector 42 is arranged between safety overflow valve 41 and oil inlet pipe 91.
The ratchet hydraulic control system of the present embodiment can be different according to load suffered by ratchet tensioning hydro-cylinder 10a, 10b, control separately ratchet tensioning hydro-cylinder 10a, 10b.
Wherein, three kinds of working staties of ratchet lock device existence:
As shown in Figure 3, ratchet lock device is in original state, and ratchet tensioning hydro-cylinder 10a is in full reduced state, and ratchet lock-off oil cylinder 20a is in and entirely stretches state, and spring cylinder 80 medi-spring is in compressive state.
As shown in Figure 4, ratchet lock device is in delocking state, and ratchet tensioning hydro-cylinder 10a is in full reduced state, and ratchet lock-off oil cylinder 20a is in full reduced state, and spring cylinder 80 medi-spring is in compressive state.
As shown in Figure 5, ratchet lock device is in the lock state, and ratchet tensioning hydro-cylinder 10a is in and entirely stretches state, and ratchet lock-off oil cylinder 20a is in and entirely stretches state, and spring cylinder 80 medi-spring is in compressive state.
This ratchet hydraulic control system working procedure is as follows:
Be with the hoist surpassed when arm stretches out, ratchet elevator needs are corresponding puts rope, and when arm is retracted, ratchet elevator needs corresponding rope closing.When ratchet elevator needs work, ratchet lock device must be in delocking state.Lock-off process is, the piston rod of ratchet tensioning hydro-cylinder 10a, 10b is retracted, now, the electromagnet Y3 of ratchet tensioning master control valve 11 obtains electric, ratchet tensioning master control valve 11 is in the first station, the rod chamber oil-feed of ratchet tensioning hydro-cylinder 10a, 10b, rodless cavity oil return, the piston rod of ratchet tensioning hydro-cylinder 10a, 10b is retracted.After electric detection device detects that the piston rod of ratchet tensioning hydro-cylinder 10a, 10b is reduced to position, ratchet lock-off oil cylinder 20a, 20b is needed to retract, to pull ratchet tensioning hydro-cylinder 10a, 10b to lock-off position, now, the electromagnet Y1 of ratchet lock-off master control valve 21 obtains electric, and ratchet lock-off master control valve 21 is in the first station, the rod chamber oil-feed of ratchet lock-off oil cylinder 20a, 20b, rodless cavity oil return, the piston rod of ratchet lock-off oil cylinder 20a, 20b is retracted, and realizes unlocking.
In order to improve the stressing conditions of arm, reduce the amount of deflection of arm, when being with the hoist surpassed to need the wire rope on ratchet elevator to bear certain pulling force, ratchet lock device must be in the lock state.When ratchet lock device carries out locking, two electromagnet Y6, Y8 of two elevator withdrawing rope master control valves 31 obtain electric, elevator withdrawing rope master control valve 31 is in the second station, oil hydraulic motor 30a, 30b rotate forward, ratchet elevator rope closing, conveniently control and improve control accuracy, elevator withdrawing rope master control valve 31 is proportional electromagnetic valve, can control ratchet elevator rope closing speed by the current value controlling elevator withdrawing rope master control valve 31.Safety overflow valve 41 is also proportional electromagnetic valve, and under this operating mode, the electromagnet Y11 of safety overflow valve 41 obtains electric, safety overflow valve 41 sets a force value, is detected by rope closing pressure detector 42, when ratchet elevator rope closing pressure reaches setting value, represent that rope closing completes, need ratchet lock.Now, the electromagnet Y4 of ratchet tensioning master control valve 11, ratchet tensioning master control valve 11 is in the second station, controls two ratchet tensioning hydro-cylinder 10a, the electromagnet Y9 of first control valve of 10b, Y10 obtains electric, and the first control valve 12 is in the second station, oil inlet pipe and ratchet tensioning hydro-cylinder 10a, the rodless cavity of 10b is communicated with, rodless cavity oil-feed, ratchet tensioning hydro-cylinder 10a, the piston rod of 10b stretches out, and is detected by ratchet tensioning pressure detector 14, ratchet tensioning hydro-cylinder 10a, 10b pressure reaches a setting value, and detects ratchet tensioning hydro-cylinder 10a by electric detection device, after 10b reaches position, the electromagnet Y2 of ratchet lock-off master control valve 21 obtains electric, ratchet lock-off oil cylinder 20a, 20b stretches out, and spring cylinder 80 inner spring is in compressive state, to ratchet tensioning hydro-cylinder 10a, 10b elastic force, by ratchet tensioning hydro-cylinder 10a, 10b pushes in ratchet slot, and electric detection device detects ratchet tensioning hydro-cylinder 10a, after the piston rod of 10b enters groove, ratchet tensioning master control valve 11, ratchet lock-off master control valve 21, elevator withdrawing rope master control valve 31 all mediates station, realizes ratchet lock.
If find to reach same setting value when ratchet tensioning pressure detector 14, but electrically detection device detects that some ratchet tensioning hydro-cylinder 10a or ratchet tensioning hydro-cylinder 10b do not reach position, can control tensioning separately by corresponding first control valve 12.
If ratchet tensioning hydro-cylinder 10a does not reach position, then the electromagnet Y4 of ratchet tensioning master control valve 11 obtains electric, ratchet tensioning master control valve 11 is in the second station, the electromagnet Y9 of the first control valve 12 obtains electric, first control valve 12 is in the second station, oil inlet pipe 91 continues to ratchet tensioning hydro-cylinder 10a fuel feeding, the piston rod of ratchet tensioning hydro-cylinder 10a continues to stretch out, realize the independent tensioning of ratchet tensioning hydro-cylinder 10a, the electromagnet Y11 of safety overflow valve 41 obtains electric simultaneously, set another setting value, until electrically detection device detects that ratchet tensioning hydro-cylinder 10a reaches position, the electromagnet Y2 of ratchet lock-off master control valve 21 obtains electric, ratchet lock-off oil cylinder 20a stretches out, spring cylinder 80 inner spring is in compressive state, to ratchet tensioning hydro-cylinder 10a mono-elastic force, ratchet tensioning hydro-cylinder 10a is pushed in ratchet slot, after electric detection device detects that ratchet tensioning hydro-cylinder 10a enters groove, ratchet tensioning master control valve 11, the equal dead electricity of electromagnet of ratchet lock-off master control valve 21 and the first control valve 12, realize ratchet lock.
If ratchet tensioning hydro-cylinder 10b does not reach position, then the electromagnet Y4 of ratchet tensioning master control valve 11 obtains electric, ratchet tensioning master control valve 11 is in the second station, the electromagnet Y10 of the first control valve 12 obtains electric, first control valve 12 is in the second station, oil inlet pipe 91 continues to ratchet tensioning hydro-cylinder 10b fuel feeding, continue to stretch ratchet tensioning hydro-cylinder 10b, the electromagnet Y11 of safety overflow valve 41 obtains electric simultaneously, set another setting value, until electrically detection device detects that ratchet tensioning hydro-cylinder 10b reaches position, the electromagnet Y2 of ratchet lock-off master control valve 21 obtains electric, ratchet lock-off oil cylinder 20b stretches out, spring cylinder 80 inner spring is in compressive state, to ratchet tensioning hydro-cylinder 10b mono-elastic force, ratchet tensioning hydro-cylinder 10 is pushed in ratchet slot, after electric detection device detects that ratchet tensioning hydro-cylinder 10b enters groove, ratchet tensioning master control valve 11, the equal dead electricity of electromagnet of ratchet lock-off master control valve 21 and the first control valve 12, realize ratchet lock.
No matter ratchet is in lock-off or lock state, ratchet lock-off oil cylinder 20a, the rod chamber of 20b and rodless cavity communicate with system oil return pipe 92, be in quick condition, the ratchet tensioning hydro-cylinder 10a of ratchet lock device, 10b and ratchet lock-off oil cylinder 20a, 20b adopts new layout pattern, also be, ratchet lock-off oil cylinder 20a, 20b is by ratchet tensioning hydro-cylinder 10a, the side-lower of 10b is set to above side, spring cylinder 80 is also arranged on ratchet tensioning hydro-cylinder 10a simultaneously, above the side of 10b, ratchet lock-off oil cylinder 20a, 20b is differential cylinder, active area is not etc., ratchet lock-off oil cylinder 20a, 20b gives ratchet tensioning hydro-cylinder 10a all the time, 10b secure side to power, improve the Security of system.
Conveniently control, ratchet lock-off master control valve 21, ratchet tensioning master control valve 11 and elevator withdrawing rope master control valve 31 are proportional electromagnetic valve.Safety overflow valve 41 is ratio electromagnetic relief valve.First control valve 12 is Solenoid ball valve.
When ratchet tensioning action needs fine motion, only need the current value of ratchet tensioning master control valve 11 to do corresponding control, just can obtain good fretting performance.
Solenoid ball valve is not only allow ratchet tensioning action realize single action, and makes ratchet tensioning action response quicker.The first hydraulic fluid port in Solenoid ball valve and oil circuit disconnect, the direct connected tank of the second hydraulic fluid port in Solenoid ball valve or draining road, and upper the first one-way valve 13 energy returning quickly installed of ratchet tensioning hydro-cylinder 10a, 10b, realizes quick ratchet lock.
The control procedure of its electric detection device is as follows:
After beginning, if receive locking request, then control the ratchet elevator rope closing surpassed, until detect that the pressure of ratchet elevator arrives setting value, intermediate stations got back to by elevator withdrawing rope master control valve 31, stop ratchet elevator rope closing, ratchet tensioning master control valve 11 is in the second station, the electromagnet Y9 of the first control valve 12, Y10 obtains electric, first one-way valve 13 is backed down, ratchet tensioning hydro-cylinder 10a, the rodless cavity oil-feed of 10b, ratchet tensioning hydro-cylinder 10a, the piston rod of 10b stretches out, whether ratchet tensioning pressure detector 14 detected pressures reaches setting value, if not, then detect ratchet tensioning hydro-cylinder 10a, whether 10b is flexible puts in place, if flexible not in place, then control separately the not flexible ratchet tensioning hydro-cylinder put in place until pressure reaches setting value.After the pressure detecting ratchet tensioning hydro-cylinder 10a, 10b reaches setting value, intermediate stations got back to by ratchet tensioning master control valve 11.Ratchet lock-off master control valve 21 is in the second station, and the piston rod of ratchet lock-off oil cylinder 20a, 20b stretches out, and whether detection has into groove signal, if without, prompting is locked unsuccessfully, new element of laying equal stress on.If detect into groove signal, point out and lock successfully, and terminate.
According to another aspect of the present utility model, hoist, comprise super lifting device, super lifting device comprises elevator, oil hydraulic motor 30a, 30b, ratchet mechanism and ratchet hydraulic control system, ratchet mechanism comprises ratchet, ratchet tensioning hydro-cylinder 10a, 10b and ratchet lock-off oil cylinder 20a, 20b, ratchet hydraulic control system is connected with oil hydraulic motor 30a, 30b, ratchet tensioning hydro-cylinder 10a, 10b and ratchet lock-off oil cylinder 20a, 20b respectively, it is characterized in that, ratchet hydraulic control system is above-mentioned ratchet hydraulic control system.
As can be seen from the above description, the utility model the above embodiments achieve following technique effect:
1, adopt new ratchet lock device, ratchet lock-off oil cylinder lock time, all the time give ratchet tensioning hydro-cylinder secure side to power, ensure that the safety reliability of system.
2, adopt electric proportional valve to carry out hydraulic control, simplify hydraulic system, improve system reliability, substantially increase the fine motion of ratchet lock device, governor control characteristics simultaneously.
3, ratchet tensioning action can realize single action, sets different tensioning pressures according to the concrete condition of each tensioning hydro-cylinder, make tensioning action realize more effectively, more reliable.
4, ratchet tensioning action can realize quick lock in.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Claims (10)
1. a ratchet hydraulic control system, at least two the ratchet tensioning hydro-cylinder (10a comprising ratchet tensioning master control valve (11) and be arranged in parallel, 10b), described ratchet tensioning master control valve (11) respectively with ratchet tensioning hydro-cylinder (10a, rod chamber 10b) is connected with rodless cavity, it is characterized in that, ratchet hydraulic control system also comprises ratchet tensioning control unit, described ratchet tensioning control unit comprises ratchet tension structure, described ratchet tension structure is arranged on described ratchet tensioning master control valve (11) and described ratchet tensioning hydro-cylinder (10a, between rodless cavity 10b), described ratchet tension structure comprises the first control valve (12), described first control valve (12) has the first station and the second station, when described first control valve (12) is in described first station, described ratchet tensioning hydro-cylinder (10a, hydraulic oil in rodless cavity 10b) flows directly into fuel tank, when described first control valve (12) is in described second station, described ratchet tensioning hydro-cylinder (10a, rodless cavity 10b) is connected with described ratchet tensioning master control valve (11).
2. ratchet hydraulic control system according to claim 1, it is characterized in that, described first control valve (12) has the first hydraulic fluid port, second hydraulic fluid port and the 3rd hydraulic fluid port, described first hydraulic fluid port is connected with described ratchet tensioning master control valve (11), described second hydraulic fluid port and described ratchet tensioning hydro-cylinder (10a, rodless cavity 10b) connects, described 3rd hydraulic fluid port is connected with described fuel tank, when described first control valve (12) is in the first station, described first hydraulic fluid port cut-off, described second hydraulic fluid port is communicated with described 3rd hydraulic fluid port, when described first control valve (12) is in the second station, described first hydraulic fluid port is communicated with described second hydraulic fluid port, described 3rd hydraulic fluid port cut-off.
3. ratchet hydraulic control system according to claim 2, it is characterized in that, described ratchet tension structure also comprises the first one-way valve (13), between the second hydraulic fluid port that described first one-way valve (13) is connected to described first control valve (12) and the rodless cavity of described ratchet tensioning hydro-cylinder (10a, 10b), described first one-way valve (13) has the control mouth be connected with the rod chamber of described ratchet tensioning hydro-cylinder (10a, 10b).
4. ratchet hydraulic control system according to claim 1, it is characterized in that, described ratchet tensioning control unit also comprises ratchet tensioning pressure detector (14), described ratchet tensioning pressure detector (14) is arranged on the pipeline that is connected with the rodless cavity of described ratchet tensioning hydro-cylinder (10a, 10b), and detects the pressure of the rodless cavity of described ratchet tensioning hydro-cylinder (10a, 10b).
5. ratchet hydraulic control system according to claim 1, is characterized in that, described first control valve (12) is Solenoid ball valve, and when the electromagnet of described Solenoid ball valve obtains electric, described first control valve (12) is in the second station.
6. ratchet hydraulic control system according to claim 2, it is characterized in that, described ratchet tensioning master control valve (11) has the first station, second station and intermediate stations, described ratchet tensioning master control valve (11) mediates station and described first control valve (12) when being in the second station, described ratchet tensioning hydro-cylinder (10a, rod chamber 10b) and rodless cavity are all connected with return tube (92), described ratchet tensioning master control valve (11) be in the first station and described first control valve (12) is in the second station time, oil inlet pipe (91) is by described ratchet tensioning master control valve (11) and described ratchet tensioning hydro-cylinder (10a, rod chamber 10b) connects, described return tube (92) is by described ratchet tensioning master control valve (11) and described ratchet tensioning hydro-cylinder (10a, rodless cavity 10b) connects, when described ratchet tensioning master control valve (11) is in the second station and described first control valve (12) is in the second station time, described oil inlet pipe (91) is by described ratchet tensioning master control valve (11) and described ratchet tensioning hydro-cylinder (10a, rodless cavity 10b) connects, described return tube (92) is by described ratchet tensioning master control valve (11) and described ratchet tensioning hydro-cylinder (10a, rod chamber 10b) connects.
7. ratchet hydraulic control system according to claim 6, it is characterized in that, described ratchet tensioning master control valve (11) has the first hydraulic fluid port, second hydraulic fluid port, 3rd hydraulic fluid port and the 4th hydraulic fluid port, described first hydraulic fluid port is connected with described oil inlet pipe (91), described second hydraulic fluid port is connected with described return tube (92), described 3rd hydraulic fluid port and described ratchet tensioning hydro-cylinder (10a, rodless cavity 10b) connects, described 4th hydraulic fluid port and described ratchet tensioning hydro-cylinder (10a, rod chamber 10b) connects, when described ratchet tensioning master control valve (11) is in described first station, first hydraulic fluid port of described ratchet tensioning master control valve (11) is communicated with the 4th hydraulic fluid port, second hydraulic fluid port of described ratchet tensioning master control valve (11) is communicated with the 3rd hydraulic fluid port, when described ratchet tensioning master control valve (11) is in the second station, first hydraulic fluid port of described ratchet tensioning master control valve (11) is communicated with the 3rd hydraulic fluid port, second hydraulic fluid port of described ratchet tensioning master control valve (11) is communicated with the 4th hydraulic fluid port, described ratchet tensioning master control valve (11) mediate station time, first hydraulic fluid port cut-off of described ratchet tensioning master control valve (11), second hydraulic fluid port is communicated with the 4th hydraulic fluid port with the 3rd hydraulic fluid port respectively.
8. ratchet hydraulic control system according to claim 1, is characterized in that,
Ratchet hydraulic control system also comprises ratchet lock-off control unit, described ratchet lock-off control unit and described ratchet tensioning control unit are connected in parallel on oil inlet pipe (91) and return tube (92), described ratchet lock-off control unit comprises ratchet lock-off master control valve (21), described ratchet lock-off master control valve (21) respectively with ratchet lock-off oil cylinder (20a, rod chamber 20b) is connected with rodless cavity, described ratchet lock-off master control valve (21) has the first station, second station and intermediate stations, when described ratchet lock-off master control valve (21) is in described first station, described oil inlet pipe (91) and described ratchet lock-off oil cylinder (20a, rod chamber 20b) connects, described return tube (92) and described ratchet lock-off oil cylinder (20a, 20b) rodless cavity connects, when described ratchet lock-off master control valve (21) is in the second station, described oil inlet pipe (91) and described ratchet lock-off oil cylinder (20a, rodless cavity 20b) connects, described return tube (92) and described ratchet lock-off oil cylinder (20a, rod chamber 20b) connects, described ratchet lock-off master control valve (21) mediate station time, described return tube (92) respectively with described ratchet lock-off oil cylinder (20a, rod chamber 20b) is connected with rodless cavity,
Ratchet hydraulic control system also comprises elevator withdrawing rope control unit, described elevator withdrawing rope control unit, described ratchet lock-off control unit and described ratchet tensioning control unit are all connected in parallel on return tube (92) and oil inlet pipe (91), described elevator withdrawing rope control unit comprises elevator withdrawing rope master control valve (31), described withdrawing rope master control valve and oil hydraulic motor (30a, 30b) connect, described withdrawing rope master control valve has the first station, second station and intermediate stations, when described withdrawing rope master control valve is in the first station, described oil inlet pipe (91) and described oil hydraulic motor (30a, the first hydraulic fluid port 30b) connects, described return tube (92) and described oil hydraulic motor (30a, the second hydraulic fluid port 30b) connects, described oil hydraulic motor (30a, 30b) reverse, when described withdrawing rope master control valve is in the second station, described oil inlet pipe (91) and described oil hydraulic motor (30a, the second hydraulic fluid port 30b) connects, described return tube (92) and described oil hydraulic motor (30a, the first hydraulic fluid port 30b) connects, described oil hydraulic motor (30a, 30b) rotate forward, described withdrawing rope master control valve mediate station time, described oil hydraulic motor (30a, 30b) and between described oil inlet pipe (91) and described return tube (92) end.
9. ratchet hydraulic control system according to claim 1, it is characterized in that, ratchet hydraulic control system also comprises safety overflow unit, described safety overflow unit is arranged between oil inlet pipe (91) and fuel tank, described safety overflow unit comprises safety overflow valve (41) and rope closing pressure detector (42), and described rope closing pressure detector (42) is arranged between described safety overflow valve (41) and described oil inlet pipe (91).
10. a hoist, comprise super lifting device, described super lifting device comprises elevator, oil hydraulic motor (30a, 30b), ratchet mechanism and ratchet hydraulic control system, described ratchet mechanism comprises ratchet, ratchet tensioning hydro-cylinder (10a, 10b) with ratchet lock-off oil cylinder (20a, 20b), described ratchet hydraulic control system respectively with described oil hydraulic motor (30a, 30b), described ratchet tensioning hydro-cylinder (10a, 10b) with described ratchet lock-off oil cylinder (20a, 20b) connect, it is characterized in that, the ratchet hydraulic control system of described ratchet hydraulic control system according to any one of claim 1 to 9.
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| CN201420581643.5U CN204213077U (en) | 2014-10-09 | 2014-10-09 | Ratchet wheel hydraulic control system and crane with same |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108840261A (en) * | 2018-08-14 | 2018-11-20 | 中联重科股份有限公司 | Method and device for controlling super-lift winch and super-lift winch control system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108840261A (en) * | 2018-08-14 | 2018-11-20 | 中联重科股份有限公司 | Method and device for controlling super-lift winch and super-lift winch control system |
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