CN117722404A - Hydraulic system of straddle carrier - Google Patents
Hydraulic system of straddle carrier Download PDFInfo
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- CN117722404A CN117722404A CN202410121198.2A CN202410121198A CN117722404A CN 117722404 A CN117722404 A CN 117722404A CN 202410121198 A CN202410121198 A CN 202410121198A CN 117722404 A CN117722404 A CN 117722404A
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- 239000012530 fluid Substances 0.000 claims description 3
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- 238000005859 coupling reaction Methods 0.000 claims description 2
- 238000013016 damping Methods 0.000 abstract description 4
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 378
- 238000000034 method Methods 0.000 description 8
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- 239000010720 hydraulic oil Substances 0.000 description 3
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- 239000010729 system oil Substances 0.000 description 3
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- 238000007792 addition Methods 0.000 description 1
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Abstract
The invention relates to the technical field of hydraulic systems, in particular to a hydraulic system of a straddle carrier, which comprises an oil tank, a closed-center switch valve bank and a steering proportional valve bank, wherein the oil tank is connected with a main oil outlet pipe and a main oil return pipe, an oil pump is connected in series at the position of the main oil pipe, which is close to the oil tank, and pumps oil in the oil tank to a designated position through the oil pump, the closed-center switch valve bank is connected in parallel between the main oil inlet pipe and the main oil return pipe, and the closed-center switch valve bank is connected with a plurality of first hydraulic execution units, so that the first hydraulic execution units are controlled through the closed-center switch valve bank. According to the invention, the damping and the electromagnetic valve are added on the head of the steering proportional valve, the pressure of the p port is led to the load port of the three-way flow valve through the damping and the electromagnetic valve, the pressure is built, and the action of opening and closing the valve is realized, so that the cost of the one-joint proportional valve is reduced, the heating of the system is reduced, and the space is saved.
Description
Technical Field
The invention relates to the technical field of hydraulic systems, in particular to a hydraulic system of a straddle carrier.
Background
Straddle carriers are special vehicles that are specially used for handling and transporting large or overweight objects. It is commonly used for handling heavy equipment, large machinery, bridge girder segments, building structures, etc. The internal power source is that lifting and transferring of heavy objects are realized through a hydraulic system, so that a large number of hydraulic components and hydraulic oil pipes are distributed in one straddle carrier.
The hydraulic system of the straddle carrier realizes the expansion control of a lifting oil cylinder, a lifting oil cylinder or a side-shifting oil cylinder by using a switch valve group when lifting a heavy object, and realizes the steering adjustment of a steering oil cylinder of the straddle carrier through a proportional valve, and the current hydraulic circuit shared by the switch valve is usually used for taking oil from an oil port of one of the proportional valves as oil inlet of the switch valve, so that the cost of one of the switch valves is increased; secondly, the oil passes through the working outlet of the proportional valve, so that the pressure drop of the system is caused, the system is heated, and the service life of the hydraulic system is influenced.
Disclosure of Invention
In order to overcome the technical problems, the invention aims to provide a hydraulic system of a straddle carrier, which is characterized in that a damping and an electromagnetic valve are additionally arranged on the head of a steering proportional valve, the pressure of a p port is led to a load port of a three-way flow valve through the damping and the electromagnetic valve, the pressure is built, and the action of opening and closing the valve is realized, so that the cost of the one-way proportional valve is reduced, the heating of the system is reduced, and the space is saved.
The aim of the invention can be achieved by the following technical scheme:
the utility model provides a straddle carrier hydraulic system, includes oil tank, closed center switch type valves and turns to the proportional valves, the oil tank is connected with main oil pipe and main oil return pipe, main oil pipe is in the place department in close proximity to the oil tank has the oil pump in series, pumps the fluid in the oil tank to appointed position department through the oil pump, it has closed center switch type valves to connect in parallel between main oil pipe and the main oil return pipe, closed center switch type valves is connected with a plurality of hydraulic execution unit one, controls hydraulic execution unit one through closed center switch type valves like this to realize that the straddle carrier promotes, lifts and moves to the side to the heavy object, it has a plurality of to turn to the proportional valves to be connected with hydraulic execution unit two to turn to between main oil pipe and the main oil return pipe, turn to the proportional valves and be connected with the time oil return pipe one that communicates with the oil tank, like this fluid can retrieve to the oil tank.
The method is further characterized in that: the overflow valve I is connected in series to the position, close to the outlet end of the oil pump, of the main oil outlet pipe, hydraulic oil of the system can be filtered through the overflow valve I, a filter is connected between the overflow valve I and the oil pump and between the overflow valve I and the main oil return pipe, and the filter is used for maintaining the oil pressure of the system in a safety range.
The method is further characterized in that: the valve block comprises an integrated seat I, wherein the integrated seat I is provided with an oil port A and an oil port B, the oil port A is communicated with a main oil outlet pipe, the oil port B is communicated with a main oil return pipe, oil can be conveyed to reversing valves in the valve block during operation of the oil pump, an oil outlet pipe I and an oil return pipe I are respectively connected between the oil outlet pipe I and the oil return pipe I, a plurality of reversing valves are connected in parallel between the oil outlet pipe I and the oil return pipe I, corresponding telescopic control is carried out on a hydraulic execution unit I through the reversing valves, an oil port a and an oil port B which are communicated with the corresponding reversing valves are arranged at positions, corresponding to the reversing valves, of the outer wall of the integrated seat I, and a hydraulic execution unit I is connected between the oil port a and the oil port B, which are connected with the same reversing valve.
The method is further characterized in that: the first hydraulic execution unit is any one of a lifting oil cylinder, a lifting oil cylinder or a side shifting oil cylinder, so that the lifting, lifting or side shifting actions of the heavy object can be realized through different oil cylinders.
The method is further characterized in that: the steering proportion valve group comprises an oil inlet link, a plurality of working links and a tail link, wherein the oil inlet link is communicated with a main oil outlet pipe and a main oil return pipe, the working link at the head end position is communicated with the oil inlet link, the tail link is communicated with the working link at the tail end position, the working link is connected with a second hydraulic execution unit, the tail link is communicated with a first secondary oil return pipe, the oil inlet link realizes an oil inlet and return function, the working link realizes element reversing and proportion speed regulating functions, and the tail link provides pilot control oil for the inside of the working link.
The method is further characterized in that: the second hydraulic execution unit is a steering oil cylinder, so that steering adjustment of the straddle carrier is realized.
The method is further characterized in that: the oil inlet unit comprises an integrated seat II, wherein the integrated seat II is provided with a C oil port, a D oil port, an E oil port, a C oil port, a D oil port and an E oil port, the C oil port and the C oil port are communicated with a first oil return pipe, the D oil port and the D oil port are communicated with a second oil return pipe, a second oil outlet is communicated between the E oil port and the E oil port, the D oil port is fixedly provided with a first plug, a three-way flow valve is connected between the second oil outlet pipe and the second oil return pipe, the other port of the three-way flow valve is communicated with the first oil return pipe through a first pipeline, the second oil return pipe and the second oil return pipe are sequentially connected with a second control pipeline, the second oil return pipe is sequentially connected with an electromagnetic valve and a second overflow valve in series, the second oil return pipe is safe, the damage to the pipeline caused by excessive oil pressure is prevented, the flow valve is connected between the second control pipeline and the second oil return pipe in series, the pressure fluctuation is restrained through the flow valve, and the second control pipeline is communicated with the first pipeline through the second oil return valve.
The method is further characterized in that: the working unit comprises an integrated seat III, wherein the integrated seat III is provided with an F oil port, a G oil port, an H oil port, an H oil port, a G oil port, an F oil port, a j oil port, a k oil port, an l oil port and an m oil port, a branch oil return pipe III is connected between the F oil port and the F oil port, a control oil pipe III is connected between the G oil port and the G oil port, a expenditure oil pipe III is connected between the H oil port and the H oil port, a G oil port is fixedly provided with a plug II, the F oil port is fixedly provided with the plug III, a reversing valve core is connected between the expenditure oil pipe III and the branch oil return pipe III in parallel, the reversing valve core controls the flow of a hydraulic execution unit II to be constant, so that the steering action is more stable, two working oil ports of the reversing valve core are respectively connected with the l oil port and the m oil port correspondingly, a control port I of the reversing valve core is connected with an electric proportional pressure reducing valve II through a pipeline II, the control port two of the reversing valve core is connected with the oil outlet of the first electric proportional pressure reducing valve through a pipeline III, the steering action overpressure is prevented by arranging the first electric proportional pressure reducing valve and the second electric proportional pressure reducing valve, the oil inlets of the reversing valve core and the first electric proportional pressure reducing valve are communicated with the k oil port, the oil outlets of the reversing valve core and the first electric proportional pressure reducing valve are communicated with the j oil port, the rear oil inlet of the reversing valve core is communicated with the rear oil inlet of the valve rear compensation valve core, the front oil inlet and the inlet oil control end of the valve rear compensation valve core are communicated with the front oil inlet of the reversing valve core, the load sensitive end and the load oil port of the valve rear compensation valve core are communicated with the control oil pipe III through a pipeline IV, the reversing valve core is controlled to stabilize flow under the specified opening degree through the valve rear compensation valve core, the H oil port is communicated with the e oil port, the d oil port is communicated with the G oil port, and the oil port c is communicated with the oil port F.
The method is further characterized in that: the tail connector comprises an integrated seat IV, the integrated seat IV is provided with an N oil port, an O oil port, a P oil port, a P oil port, a q oil port and an O oil port, the O oil port and the O oil port are communicated with a pipeline V, a expenditure oil pipe IV is communicated between the P oil port and the P oil port, a plug IV is fixed on the P oil port, a plug V is fixed on the q oil port, the N oil port is communicated with an oil outlet of the pressure reducing valve through the pipeline V, the oil inlet of the pressure reducing valve is communicated with a expenditure oil pipe IV, the oil drain port of the pressure reducing valve is communicated with a pipeline V, the oil outlet of the pressure reducing valve is communicated with a secondary oil return pipe I, the oil outlet of the pressure reducing valve is communicated with an oil outlet of the pressure reducing valve H, the oil outlet of the pressure reducing valve H is communicated with the oil outlet of the pressure reducing valve H, the oil outlet of the pressure reducing valve K is communicated with the oil outlet of the pressure reducing valve N, and the position control pressure of the pressure reducing valve H is in a low pressure state.
The invention has the beneficial effects that:
1. an oil pump is connected in series at the position of the main oil pipe, which is close to the oil tank, oil in the oil tank is pumped to a designated position through the oil pump, a closed center switch type valve bank is connected in parallel between the main oil inlet pipe and the main oil return pipe, a plurality of first hydraulic execution units are connected in parallel between the main oil inlet pipe and the main oil return pipe, a plurality of steering proportion valve banks are connected between the main oil inlet pipe and the main oil return pipe, a second hydraulic execution unit is connected to the steering proportion valve bank, steering action adjustment of the straddle carrier is realized through the steering proportion valve bank, the steering proportion valve bank is connected with a first secondary oil return pipe communicated with the oil tank, thus the oil can be recycled into the oil tank, an integrated seat of the closed center switch type valve bank is provided with an oil port A and an oil port B, the oil port A is communicated with the main oil outlet pipe, the oil port B is communicated with the main oil return pipe, thus the oil pump can convey the oil to a reversing valve in the closed center switch type valve bank during operation, the hydraulic actuator unit I is connected between the an oil port and the B oil port, the walking steering system can be controlled in proportion by the arrangement, thus when the valve group at the closed center is not operated, the main oil way is depressurized at low pressure through the steering proportional valve, and the operation is realized, the loop is simple, the condition of meeting the system function is satisfied, the cost is reduced at one time, the heating value of the system is reduced at the other time, meanwhile, convenience is increased for operation in a narrow space of the straddle carrier.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a diagram of a hydraulic control system of a straddle carrier of the present invention;
FIG. 2 is a diagram of a prior art hydraulic control system for a straddle carrier;
FIG. 3 is a diagram of a closed center on-off valve block system of the present invention;
FIG. 4 is a diagram of a steering proportioning valve system of the present invention;
FIG. 5 is a diagram of an oil feed system in accordance with the present invention;
FIG. 6 is a diagram of a work linkage system in accordance with the present invention;
FIG. 7 is a tail-link system diagram in accordance with the present invention.
In the figure: 100. an oil tank; 200. an oil pump; 300. a filter; 400. an overflow valve I; 500. closing a central switch type valve group; 510. an integrated seat I; 511. a reversing valve; 600. a first hydraulic execution unit; 700. a second hydraulic execution unit; 800. steering proportional valve group; 810. an oil inlet unit; 811. an integration seat II; 812. a flow valve; 813. a three-way flow valve; 814. an electromagnetic valve; 815. an overflow valve II; 820. a work linkage; 821. an integration seat III; 822. a reversing valve core; 823. a valve post-compensation spool; 824. an electric proportional pressure reducing valve I; 825. an electric proportional pressure reducing valve II; 830. tail connection; 831. an integration seat IV; 832. a pressure reducing valve.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-7, a hydraulic system of a straddle carrier includes an oil tank 100, a closed-center switch valve bank 500 and a steering proportion valve bank 800, the oil tank 100 is connected with a main oil outlet pipe and a main oil return pipe, the main oil pipe is connected with an oil pump 200 in series at a position close to the oil tank 100, the oil in the oil tank 100 is pumped to a designated position through the oil pump 200, the closed-center switch valve bank 500 is connected in parallel between the main oil inlet pipe and the main oil return pipe, the closed-center switch valve bank 500 is connected with a plurality of first hydraulic execution units 600, thus the first hydraulic execution units 600 are controlled through the closed-center switch valve bank 500, the lifting, lifting and side shifting actions of the straddle carrier on a heavy object are realized, a plurality of steering proportion valve banks 800 are connected between the main oil inlet pipe and the main oil return pipe, the steering proportion valve bank 800 is connected with a second hydraulic execution unit 700, the steering action adjustment of the straddle carrier is realized through the steering proportion valve bank 800, and the first oil return pipe communicated with the oil tank 100 is recycled into the oil tank 100.
The overflow valve 400 is connected in series at the position, close to the outlet end of the oil pump 200, of the main oil outlet pipe, the system hydraulic oil can be filtered through the overflow valve 400, the filter 300 is connected between the overflow valve 400 and the oil pump 200 and between the main oil outlet pipe and the main oil return pipe, and the system oil pressure is maintained in a safety range through the filter 300.
The closed center switch valve group 500 comprises an integrated seat I510, the integrated seat I510 is provided with an oil port A and an oil port B, the oil port A is communicated with a main oil outlet pipe, the oil port B is communicated with a main oil return pipe, thus oil can be conveyed to a reversing valve 511 in the closed center switch valve group 500 when the oil pump 200 works, the oil port A and the oil port B are respectively connected with a first expenditure oil pipe and a first branch oil return pipe which are positioned in the integrated seat I510, a plurality of reversing valves 511 are connected in parallel between the first expenditure oil pipe and the first branch oil return pipe, the position of the outer wall of the first hydraulic execution unit 600 corresponding to the reversing valve 511 is provided with an oil port a and an oil port B which are communicated with the corresponding reversing valve 511 through the reversing valve 511, the hydraulic execution unit I600 is connected between the oil port a and the oil port B connected with the same reversing valve 511, and the hydraulic execution unit I600 is any one of a lifting oil cylinder, a lifting oil cylinder or a side shifting oil cylinder, so that the lifting, lifting or side shifting actions of a heavy object can be realized through different oil cylinders.
The steering proportion valve group 800 comprises an oil inlet link 810, a plurality of working links 820 and a tail link 830, wherein the oil inlet link 810 is communicated with a main oil outlet pipe and a main oil return pipe, the working link 820 at the head end position is communicated with the oil inlet link 810, the tail link 830 is communicated with the working link 820 at the tail end position, the working link 820 is connected with a second hydraulic execution unit 700, the tail link 830 is communicated with a first secondary oil return pipe, the oil inlet link 810 realizes an oil inlet and return function, the working link 820 realizes element reversing and proportion speed regulating functions, the tail link 830 provides pilot control oil for the inside of the working link 820, the second hydraulic execution unit 700 is a steering oil cylinder, and therefore steering adjustment of the straddle carrier is realized.
The oil inlet unit 810 comprises an integrated seat II 811, the integrated seat II 811 is provided with a C oil port, a D oil port, an E oil port, a C oil port, a D oil port and an E oil port, the C oil port and the C oil port are communicated with a first oil branch return pipe, the D oil port and the D oil port are communicated with a second oil control pipe, a second oil branch pipe is communicated between the E oil port and the E oil port, a first plug is fixed on the D oil port, a three-way flow valve 813 is connected between the second oil branch pipe and the second oil branch return pipe, the other port of the three-way flow valve 813 is communicated with the first oil control pipe through a first pipeline, a second oil control pipe is connected with the second oil control pipe through a second pipeline, an electromagnetic valve 814 and a second overflow valve 815 are sequentially connected in series from the second oil branch pipe to the second oil branch return pipe, a safety effect is achieved through the second overflow valve 815, the second oil control pipe is prevented from damaging the pipeline, a flow valve 812 is connected between the electromagnetic valve 814 and the second overflow valve 815, pressure fluctuation is suppressed through the flow valve 812, and the second oil control pipe is communicated with the first pipeline between the electromagnetic valve 814 and the second overflow valve 815.
The working link comprises an integrated seat III 821, the integrated seat III 821 is provided with an F oil port, a G oil port, an H oil port, an H oil port, a G oil port, an F oil port, a j oil port, a k oil port, an l oil port and an m oil port, a branch oil return pipe III is connected between the F oil port and the F oil port, a control oil pipe III is connected between the G oil port and the G oil port, a expenditure oil pipe III is connected between the H oil port and the H oil port, a G oil port is fixedly provided with a plug II, a plug III is fixedly arranged on the F oil port, a reversing valve core 822 is connected between the expenditure oil pipe III and the branch oil return pipe III in parallel, the reversing valve core 822 controls the flow to the hydraulic execution unit II 700 constantly, so that the steering action is more stable, the two working oil ports of the reversing valve core 822 are respectively connected with the l oil port and the m oil port correspondingly, a control port I of the reversing valve core 822 is connected with an electric proportional pressure reducing valve II 825 through a pipeline III, a control port II of the reversing valve 822 is connected with an oil outlet of an electric proportional pressure reducing valve I824, the steering action overpressure is prevented by arranging the first electric proportional pressure reducing valve 824 and the second electric proportional pressure reducing valve 825, the reversing is realized, the opening size is proportional to the current, the oil inlets of the reversing valve 822 and the first electric proportional pressure reducing valve 824 are communicated with the k oil port, the oil outlets of the reversing valve 822 and the first electric proportional pressure reducing valve 824 are communicated with the j oil port, the rear oil inlet of the reversing valve 822 is communicated with the rear oil inlet of the valve rear compensating valve 823, the front oil inlet and the inlet oil control end of the valve rear compensating valve 823 are communicated with the front oil inlet of the reversing valve 822, the load sensitive end and the load oil port of the valve rear compensating valve 823 are communicated with the control oil pipe III through the pipeline IV, the reversing valve 822 is controlled to stabilize the flow under the specified opening size through the valve rear compensating valve 823, the H oil port is communicated with the e oil port, the d oil port is communicated with the G oil port, and the oil port c is communicated with the oil port F.
The tail coupling 830 comprises an integrated seat four 831, the integrated seat four 831 is provided with an N oil port, an O oil port, a P oil port, a P oil port, a q oil port and an O oil port, the O oil port is communicated with a pipeline five, a disbursement oil pipe four is communicated between the P oil port and the P oil port, a P oil port is fixedly provided with a plug four, the q oil port is fixedly provided with a plug five, the N oil port is communicated with an oil outlet of the pressure reducing valve 832 through a pipeline six, an oil inlet of the pressure reducing valve 832 is communicated with the disbursement oil pipe four, an oil drain port of the pressure reducing valve 832 is communicated with the pipeline five, the O oil port is communicated with a secondary oil return pipe I, the P oil port is communicated with an h oil port, a j oil port is communicated with the O oil port, and a k oil port is communicated with the N oil port, and the position control pressure is in a low pressure state through the pressure reducing valve 832.
Working principle: when the system is not in operation, the oil pump 200 supplies oil, the oil is filtered by the main oil outlet pipe to the filter 300, and then the oil is split into two parts, one part passes through the oil path to the closed center switch valve group 500, and the oil path is cut off because the closed center switch valve group 500 is closed center; one path passes through an oil way to the steering proportion valve bank 800, oil is divided into three parts in the steering proportion valve bank 800, one path passes through a three-way flow valve 813, and the other path passes through an electromagnetic valve 814, and the electromagnetic valve 814 is not electrified at the moment, so that the oil way is cut off;
the system oil returns to the F oil port through the three-way flow valve 813 under standby pressure and returns to the oil tank 100 through the main oil return pipe.
When the steering system works, the oil pump 200 supplies oil, the oil is filtered by the filter 300 through the main oil outlet pipe, one path of the oil is connected to the closed center switch valve group 500 through the oil path, and the oil path is cut off because the closed center switch valve group 500 is closed center;
one path passes through an oil way to the steering proportion valve bank 800, oil is divided into three parts in the steering proportion valve bank 800, one path passes through a three-way flow valve 813, and the other path passes through an electromagnetic valve 814, and the electromagnetic valve 814 is not electrified at the moment, so that the oil way is cut off; the H oil port of the working unit 820 is communicated with the H oil port due to the action of the steering system, the G oil port oil way builds pressure, at this time, part of the system oil meets the requirement of the second 700 specific steering of the hydraulic execution unit, and the rest part returns to the C oil port through the three-way flow valve 813 and returns to the oil tank 100 through the main oil return pipe.
When the closed center switch type valve bank 500 acts, the electromagnetic valve 814 on the steering proportional valve bank 800 is powered on simultaneously; the oil pump 200 supplies oil, the oil is filtered by the main oil outlet pipe to the filter 300 and then is split into two parts, one part passes through the oil circuit to the closed center switch type valve group 500, and the reversing valve 511 acts, so that the oil circuit is connected to the first hydraulic execution unit 600 to build pressure;
one path passes through an oil way to the steering proportion valve group 800, oil is divided into three parts in the steering proportion valve group 800, and the other path passes through an H oil port of the working link 820, and the H oil port is cut off because the steering system does not act; one to the three-way flow valve 813 and the other to the solenoid valve 814, since the solenoid valve 814 is energized at this time, the closed-center on-off valve block 500 has pressure applied to the three-way flow valve 813 since the operation was established, so that the three-way flow valve 813 of the steering ratio valve block 800 builds pressure. In this way, the system realizes the proportional control and other action switch control of the steering system.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is merely illustrative and explanatory of the invention, as various modifications and additions may be made to the particular embodiments described, or in a similar manner, by those skilled in the art, without departing from the scope of the invention or exceeding the scope of the invention as defined in the claims.
Claims (9)
1. The utility model provides a straddle carrier hydraulic system, its characterized in that includes oil tank (100), closes central switch type valves (500) and turns to proportional valve group (800), oil tank (100) are connected with main play oil pipe and main oil return pipe, main oil pipe is in the place of next door neighbour oil tank (100) place and is established ties there is oil pump (200), it has closes central switch type valves (500) to connect in parallel between main play oil pipe and the main oil return pipe, it is connected with a plurality of hydraulic actuating unit (600) to close central switch type valves (500), it has a plurality of to turn to proportional valve group (800) to connect in parallel between main play oil pipe and the main oil return pipe, turn to proportional valve group (800) are connected with hydraulic actuating unit two (700), turn to proportional valve group (800) are connected with the time oil return pipe one with oil tank (100) intercommunication.
2. The hydraulic system of the straddle carrier according to claim 1, wherein the main oil outlet pipe is connected in series with a first overflow valve (400) adjacent to the outlet end of the oil pump (200), and a filter (300) is connected between the first overflow valve (400) and the oil pump (200) and between the main oil return pipe.
3. The hydraulic system of the straddle carrier according to claim 2, wherein the closed-center switch valve group (500) comprises an integrated seat I (510), the integrated seat I (510) is provided with an oil port A and an oil port B, the oil port A is communicated with a main oil outlet pipe, the oil port B is communicated with a main oil return pipe, the oil port A and the oil port B are respectively connected with a first oil outlet pipe and a first oil return pipe which are positioned in the integrated seat I (510), a plurality of reversing valves (511) are connected in parallel between the first oil outlet pipe and the first oil return pipe, an oil port a and an oil port B which are communicated with the corresponding reversing valves (511) are arranged on the outer wall of the integrated seat I (510) at positions corresponding to the reversing valves (511), and a hydraulic execution unit I (600) is connected between the oil port a and the oil port B which are connected with the same reversing valve (511).
4. A hydraulic straddle carrier hydraulic system according to claim 3, wherein the first hydraulic actuator unit (600) is any one of a lift cylinder, a lift cylinder or a side-shift cylinder.
5. The straddle carrier hydraulic system according to claim 1, wherein the steering proportioning valve block (800) comprises an oil inlet unit (810), a plurality of working units (820) and a tail unit (830), wherein the oil inlet unit (810) is communicated with a main oil outlet pipe and a main oil return pipe, the working units (820) at a head end position are communicated with the oil inlet unit (810), the tail unit (830) is communicated with the working units (820) at a tail end position, the working units (820) are connected with a second hydraulic execution unit (700), and the tail unit (830) is communicated with a first secondary oil return pipe.
6. The hydraulic straddle carrier hydraulic system according to claim 5, wherein the second hydraulic actuator unit (700) is a steering cylinder.
7. The hydraulic system of the straddle carrier of claim 6, wherein the oil inlet unit (810) comprises an integrated seat II (811), wherein the integrated seat II (811) is provided with a C oil port, a D oil port, an E oil port, a C oil port, a D oil port and an E oil port, the C oil port and the C oil port are communicated with a branch oil return pipe II, the D oil port and the D oil port are communicated with a control oil pipe I, a branch oil pipe II is communicated with the E oil port and the E oil port, a plug I is fixedly arranged on the D oil port, a three-way flow valve (813) is connected between the branch oil pipe II and the branch oil return pipe II, the other port of the three-way flow valve (813) is communicated with the control oil pipe I through a pipeline I, a control oil pipe II is connected with the control oil pipe II, the control oil pipe II is sequentially connected with a solenoid valve (814) and an overflow valve II (815) in series, the control oil pipe II is connected with the branch oil return valve II (815) in series between the solenoid valve (814) and the overflow valve II), and the control oil pipe II is connected with the solenoid valve (815) in series.
8. The hydraulic system of the straddle carrier of claim 7, wherein the working fluid includes an integrated seat three (821), the integrated seat three (821) is provided with an F port, a G port, an H port, a G port, an F port, a j port, a k port, an l port and an m port, a branch oil return pipe three is connected between the F port and the F port, a control oil pipe three is connected between the G port and the G port, a branch oil pipe three is connected between the H port and the H port, the G port is fixed with a plug two, the F port is fixed with a plug three, a reversing valve core (822) is connected in parallel between the branch oil pipe three and the branch oil return pipe three, two working ports of the reversing valve core (822) are respectively connected with the l port and the m port, a control port one of the reversing valve core (822) is connected with an oil outlet of a first electric proportional pressure reducing valve (824) through a pipeline two, the first pressure reducing valve (822) and the electric proportional valve (824) are electrically connected with an oil inlet of a compensating valve (823) and a rear valve core (822) through a pipeline two, the two working ports of the reversing valve core (822) are electrically connected with the two working ports of the reversing valve core (822) are respectively connected with the front and rear reversing valve core (823) and the reversing valve (822) and the front and rear reversing valve (822) are electrically connected with the two reversing valve (823) and the front and rear reversing valve (823) and the reversing valve (822) and the front and the reversing valve (823) and the rear reversing valve) are connected respectively, the load sensitive end and the load oil port of the valve back compensating valve core (823) are communicated with the control oil pipe III through a pipeline IV, the H oil port is communicated with the e oil port, the d oil port is communicated with the G oil port, and the c oil port is communicated with the F oil port.
9. The hydraulic system of the straddle carrier of claim 8, wherein the tail coupling (830) comprises an integrated seat four (831), the integrated seat four (831) is provided with an N oil port, an O oil port, a P oil port, a q oil port and an O oil port, the O oil port and the O oil port are communicated with a pipeline five, a disbursement oil pipe four is communicated between the P oil port and the P oil port, a plug four is fixed to the P oil port, a plug five is fixed to the q oil port, the N oil port is communicated with an oil outlet of a pressure reducing valve (832) through a pipeline six, an oil inlet of the pressure reducing valve (832) is communicated with the disbursement oil pipe four, an oil drain port of the pressure reducing valve (832) is communicated with the pipeline five, the O oil port is communicated with a secondary oil return pipe one, the P oil port is communicated with an h oil port, the j oil port is communicated with the O oil port, and the k oil port is communicated with the N oil port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410121198.2A CN117722404A (en) | 2024-01-29 | 2024-01-29 | Hydraulic system of straddle carrier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410121198.2A CN117722404A (en) | 2024-01-29 | 2024-01-29 | Hydraulic system of straddle carrier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117722404A true CN117722404A (en) | 2024-03-19 |
Family
ID=90203743
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410121198.2A Pending CN117722404A (en) | 2024-01-29 | 2024-01-29 | Hydraulic system of straddle carrier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117722404A (en) |
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2024
- 2024-01-29 CN CN202410121198.2A patent/CN117722404A/en active Pending
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