CN211228657U - Land leveler and land leveler control hydraulic system of land leveler - Google Patents
Land leveler and land leveler control hydraulic system of land leveler Download PDFInfo
- Publication number
- CN211228657U CN211228657U CN201921865721.3U CN201921865721U CN211228657U CN 211228657 U CN211228657 U CN 211228657U CN 201921865721 U CN201921865721 U CN 201921865721U CN 211228657 U CN211228657 U CN 211228657U
- Authority
- CN
- China
- Prior art keywords
- valve
- port
- communicated
- oil cylinder
- hydraulic system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Operation Control Of Excavators (AREA)
Abstract
The utility model provides a leveler controls hydraulic system and a leveler, the leveler includes the spiller, wherein, leveler controls hydraulic system and includes: a work device hydraulic system; the hydraulic pump is used for providing hydraulic oil; the lifting oil cylinder is used for controlling the lifting or the lowering of the scraper knife; the oil outlet of the leveling control valve group is communicated with the lifting oil cylinder and is used for controlling the action of the lifting oil cylinder; the steering gear is used for controlling the steering of the land scraper; and a first port of the priority valve is communicated with an oil outlet of the hydraulic pump, a second port of the priority valve is communicated with an oil inlet of the leveling control valve group and an oil inlet of the steering gear, and a third port of the priority valve is communicated with an oil inlet of a hydraulic system of the operation device. The utility model discloses a control valve group of making level can adjust spiller spatial position to guarantee the whole planarization on bulldozing back road surface each time.
Description
Technical Field
The utility model relates to an engineering machine tool field particularly, relates to a land leveler control hydraulic system to and a land leveler including above-mentioned land leveler control hydraulic system.
Background
Generally, the action of leveler through hydraulic system control spiller, in order to guarantee the whole planarization on road surface behind bulldozing each time, need use the valve bank of making level and the spatial position of hydraulic pressure spare drive spiller motion in order to adjust the spiller to need additionally increase in the hydraulic system of leveler with the oil source of the valve bank intercommunication of making level, not only increase the processing cost of leveler hydraulic system, hydraulic system's structure is more complicated moreover and has improved the maintenance degree of difficulty.
Therefore, there is a need for a grader and a control hydraulic system that can solve the above problems.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to at least one of the problems of the prior art or the related art.
To this end, the utility model discloses a first aspect provides a leveler control hydraulic system.
A second aspect of the present invention provides a land leveler.
In view of this, a first aspect of the present invention provides a grader control hydraulic system for a grader, the grader including a blade, wherein the grader control hydraulic system includes: a work device hydraulic system; the hydraulic pump is used for providing hydraulic oil; the lifting oil cylinder is used for controlling the lifting or the lowering of the scraper knife; the oil outlet of the leveling control valve group is communicated with the lifting oil cylinder and is used for controlling the action of the lifting oil cylinder; the steering gear is used for controlling the steering of the land scraper; and a first port of the priority valve is communicated with an oil outlet of the hydraulic pump, a second port of the priority valve is communicated with an oil inlet of the leveling control valve group and an oil inlet of the steering gear, and a third port of the priority valve is communicated with an oil inlet of a hydraulic system of the operation device.
In this technical solution, the grader includes a blade and a grader control hydraulic system, and the grader control hydraulic system includes: the hydraulic system of the operation device, the hydraulic pump, the lift cylinder, the valve group of controlling of making level, steering gear and priority valve, the hydraulic pump is used for providing hydraulic oil, the first mouth (P mouth) of priority valve is linked together with the oil-out of hydraulic pump, the second mouth (CF mouth) of priority valve is linked together with the hydraulic fluid inlet of the valve group of controlling of making level and the hydraulic fluid inlet of steering gear simultaneously, when steering gear and the valve group during operation of making level, the hydraulic pump passes through the priority valve and inputs hydraulic oil to steering gear and the valve group of making level, the third mouth (EF mouth) of priority valve is linked together with the hydraulic fluid inlet of operation device hydraulic system, when operation device hydraulic system drive operation device during operation, the hydrovalve passes through the priority valve and inputs hydraulic oil to operation device. The oil-out (A1 mouth, A2 mouth, B1 mouth, B2 mouth) of control valves of making level is linked together with the lift cylinder, the lift cylinder is used for controlling the promotion and the decline of spiller, generally, the quantity of lift cylinder is two, act on the left side and the right side of spiller respectively, optionally, when the left side height of spiller is lower or higher, left lift cylinder work, the height of adjustment spiller, and in the same way, when the right side height of spiller is lower or higher, the lift cylinder work on right side, finally make the height of the left and right sides of spiller the same. Therefore, the spading knife space position (the height difference of two sides of the spading knife) can be adjusted through the leveling control valve group, so that the integral smoothness of the road surface after bulldozing each time is ensured.
Optionally, a sensor is disposed on the blade and configured to detect a ground clearance value of the blade, compare the ground clearance value of the blade with a set value, and when the left side of the blade is lower than the set value and the right side of the blade is higher than the set value, the left lifting cylinder performs a lifting action and the right lifting cylinder performs a lowering action until the ground clearance values of the left and right sides of the blade are equal to the set value, where the set value is determined according to an actual use condition.
In addition, according to the utility model provides an among the above-mentioned technical scheme's leveler control hydraulic system can also have following additional technical characteristics:
in any of the above technical solutions, preferably, the fourth port of the priority valve is connected to the leveling control valve group and the steering gear, when the leveling control valve group or the steering gear works, the signal is fed back to the fourth port of the priority valve, the first port of the priority valve is communicated with the second port of the priority valve, when the leveling control valve group and the steering gear do not work, the signal is fed back to the fourth port of the priority valve, and the first port of the priority valve is communicated with the third port of the priority valve.
In the technical scheme, when the leveling control valve group and/or the steering gear work, when the pressure value of hydraulic oil of the fourth port of the priority valve is larger than a preset value, the first port of the priority valve is communicated with the second port of the priority valve, so that continuous oil supply of the leveling control valve group and the steering gear is ensured; when the leveling control valve group and the steering gear do not work, the reversing valve and the steering gear in the leveling control valve group are in a middle core closing state, the first port of the priority valve is communicated with the third port of the priority valve, and the hydraulic pump supplies oil to the hydraulic system of the operation device.
Optionally, a fifth port (T port) of the priority valve is communicated with the hydraulic oil tank, the priority valve includes a solenoid valve and a two-position three-way valve, an LS port of the priority valve is communicated with an LS port of the two-position three-way valve, the T port of the priority valve is communicated with the LS port of the two-position three-way valve through the solenoid valve, and the pressure value of oil at the LS port of the two-position three-way valve can be controlled by controlling on/off of the solenoid valve.
Optionally, the hydraulic pump is a gear pump.
Optionally, the priority valve includes a two-position three-way valve, when high-pressure hydraulic oil enters a control port of the priority valve, the high-pressure hydraulic oil further enters an LS port of the two-position three-way valve, when a pressure value of oil at the LS port of the two-position three-way valve is greater than a preset value, a spool of the two-position three-way valve is in a left position, a P port of the priority valve is communicated with a CF port, when the pressure value of hydraulic oil at the control port of the priority valve is lower, the spool of the two-position three-way valve is in a right position, the P port of the priority valve is communicated.
In the above technical solution, preferably, the lift cylinder includes a first lift cylinder and a second lift cylinder; the leveling control valve group comprises a first reversing valve and a second reversing valve; the second port of the priority valve is in communication with the first port of the first directional valve and the first port of the second directional valve; the second port of the first reversing valve is communicated with a rodless cavity of the first lifting oil cylinder, the third port of the first reversing valve is communicated with a rod cavity of the first lifting oil cylinder, and the fourth port of the first reversing valve is communicated with a hydraulic oil tank; the second port of the second reversing valve is communicated with the rodless cavity of the second lifting oil cylinder, the third port of the second reversing valve is communicated with the rod cavity of the second lifting oil cylinder, and the fourth port of the second reversing valve is communicated with the hydraulic oil tank.
In the technical scheme, the lifting oil cylinder comprises a first lifting oil cylinder and a second lifting oil cylinder, piston rods of the first lifting oil cylinder and the second lifting oil cylinder are connected with a scraper knife, the leveling control valve group comprises a first reversing valve and a second reversing valve, a second port (CF port) of a priority valve is communicated with a first port of the first reversing valve and a first port of the second reversing valve, a second port of the first reversing valve is communicated with a rodless cavity of the first lifting oil cylinder, a third port of the first reversing valve is communicated with a rod cavity of the first lifting oil cylinder, a fourth port of the first reversing valve is communicated with a hydraulic oil tank, the first reversing valve controls the movement direction of the piston rod of the first lifting oil cylinder by controlling hydraulic oil input into the rodless cavity or the rod cavity of the first lifting oil cylinder, the second port of the second reversing valve is communicated with the rodless cavity of the second lifting oil cylinder, and the third port of the second reversing valve is communicated with the rod cavity of the second lifting oil cylinder, and a fourth port of the second reversing valve is communicated with the hydraulic oil tank, the second reversing valve controls the movement direction of a piston rod of the second lifting oil cylinder by controlling hydraulic oil to be input into a rodless cavity or a rod cavity of the second lifting oil cylinder, and the fourth port of the first reversing valve and the fourth port of the second reversing valve are communicated with the hydraulic oil tank through a T port of the leveling control valve group.
Optionally, a piston rod of the first lifting cylinder is connected to the left side or the right side of the blade, and a piston rod of the second lifting cylinder is connected to the other side of the blade.
Optionally, the reversing valve is an electro-hydraulic proportional reversing valve, the first reversing valve is provided with a first control end Y1 and a second control end Y2, the first control end Y1 and the second control end Y2 are used for controlling the position of the valve core, the second reversing valve is provided with a first control end Y3 and a second control end Y4, and the first control end Y3 and the second control end Y4 are used for controlling the position of the valve core, so that the input ports are communicated with different output ports.
In any of the above technical solutions, preferably, the first direction changing valve is connected with the first lift cylinder through a first balance member; the second reversing valve is connected with the second lifting oil cylinder through a second balance component.
In the technical scheme, the first reversing valve is connected with the first lifting oil cylinder through the first balance component, the second reversing valve is connected with the second lifting oil cylinder through the second balance component, and the balance valve is used for guaranteeing the balance of hydraulic oil pressures at two ends and improving the working stability of the first lifting oil cylinder and the second lifting oil cylinder.
Optionally, the first balancing part and the second balancing part are balancing valves or hydraulic locks, and the balancing valves or the hydraulic locks can lock the first lifting oil cylinders and the second lifting oil cylinders when the grader works, so that invariance of spatial positions of the cutting blades and working reliability are guaranteed.
In any of the above technical solutions, preferably, the leveling control valve assembly further includes: and the logic valve group is connected with the first reversing valve, the second reversing valve, the control port of the steering gear and the fourth port of the priority valve.
In the technical scheme, the leveling control valve group further comprises a logic valve group, the logic valve group is connected with the first reversing valve, the second reversing valve, a control port of the steering gear and a fourth port of the priority valve, specifically, the logic valve group is connected with oil outlets of the first reversing valve and the second reversing valve, the logic valve group compares a pressure value of control oil output by the control port of the steering gear with pressure values of hydraulic oil output by the first reversing valve and the second reversing valve, the logic valve group outputs the highest pressure value (through the hydraulic oil) to the fourth port of the priority valve, and when the pressure value of the hydraulic oil of the fourth port of the priority valve is greater than a preset value, the first port of the priority valve is communicated with the second port of the priority valve, so that continuous oil supply of the leveling control valve group and the steering gear is ensured; when the leveling control valve group and the steering gear do not work, the reversing valve and the steering gear in the leveling control valve group are in a middle core closing state, the first port of the priority valve is communicated with the third port of the priority valve, and the hydraulic pump supplies oil to the hydraulic system of the operation device.
In any one of the above technical solutions, preferably, the logic valve block includes: the first port of the first shuttle valve is communicated with the second port of the first reversing valve; a first port of the second shuttle valve is communicated with a control port of the steering gear, and a second port of the second shuttle valve is communicated with a third port of the second reversing valve; a first port of the first shuttle valve is communicated with a first port of the first reversing valve, a second port of the first shuttle valve is communicated with a second port of the first shuttle valve, and a third port of the first shuttle valve is communicated with a fourth port of the priority valve; and the first port of the fourth shuttle valve is connected with the third port of the second shuttle valve, the second port of the fourth shuttle valve is communicated with the third port of the second reversing valve, and the third port of the fourth shuttle valve is communicated with the second port of the first shuttle valve.
In the technical scheme, the logic valve group comprises a first shuttle valve, a second shuttle valve, a third shuttle valve and a fourth shuttle valve, wherein a first port of the first shuttle valve is communicated with a second port of a first reversing valve, a first port of the second shuttle valve is communicated with a control port of a steering gear, a second port of the second shuttle valve is communicated with a third port of a second reversing valve, a first port of the third shuttle valve is communicated with a third port of the first reversing valve, a second port of the third shuttle valve is communicated with a third port of the first shuttle valve, a third port of the third shuttle valve is communicated with a fourth port of a priority valve, a first port of the fourth shuttle valve is connected with a third port of the second shuttle valve, a second port of the fourth shuttle valve is communicated with a third port of the second reversing valve, a third port of the fourth shuttle valve is communicated with a second port of the first shuttle valve, and the function of the logic valve group lies in that the control port of the steering gear, the second port of the first reversing valve and the third port of the first shuttle valve are judged, And then the hydraulic oil of the port with the highest pressure is output to the fourth port of the priority valve through the third port of the third shuttle valve, namely the hydraulic oil with the highest pressure in the 5 ports is output to the fourth port of the priority valve, so that the priority valve acts according to the pressure value.
In any of the above solutions, preferably, the grader control hydraulic system further includes: and the engine is connected with the hydraulic pump and used for driving the hydraulic pump, and the engine is an internal combustion engine or an electric motor.
In the technical scheme, the hydraulic system for controlling the grader further comprises a power source, the power source is used for driving a hydraulic pump to convey hydraulic oil, and the power source can be an electric motor or an internal combustion engine.
In any of the above solutions, preferably, the grader control hydraulic system further includes: the first steering oil cylinder and the second steering oil cylinder are used for achieving steering of the land leveler, the oil outlet of the steering gear comprises a first oil outlet and a second oil outlet, the first oil outlet of the steering gear is communicated with the rod cavity of the first steering oil cylinder and the rod-free cavity of the second steering oil cylinder, and the second oil outlet of the steering gear is communicated with the rod-free cavity of the first steering oil cylinder and the rod cavity of the second steering oil cylinder.
In the technical scheme, the hydraulic control system of the land leveler further comprises a first steering oil cylinder and a second steering oil cylinder, the oil cylinders are used for achieving steering of the land leveler, an oil outlet of the steering gear comprises a first oil outlet (A port) and a second oil outlet (B port), a first oil outlet of the steering gear is communicated with a rod cavity of the first steering oil cylinder and a rodless cavity of the second steering oil cylinder, and a second oil outlet of the steering gear is communicated with the rodless cavity of the first steering oil cylinder and the rod cavity of the second steering oil cylinder and used for driving piston rods of the first steering oil cylinder and the second steering oil cylinder to move towards different directions.
In any of the above solutions, preferably, the grader control hydraulic system further includes: the lift pump is connected with the lift cylinder and used for driving the lift cylinder, and optionally, the lift pump is a hydraulic pump in any one of the technical schemes.
A second aspect of the present invention provides a grader, including: the land leveler in any of the above technical solutions controls the hydraulic system; a scraper knife; and the sensor is arranged on the scraper knife and used for acquiring the state information of the scraper knife.
In this technical scheme, the grader includes the grader control hydraulic system, blade and sensor in any one of the above-mentioned technical schemes, and the sensor sets up on the blade for gather the state information of blade, and the state information of blade can include height information, movement speed and acceleration etc. because the grader includes the grader control hydraulic system in any one of the above-mentioned technical schemes, consequently includes its whole beneficial technological effect.
Alternatively, the sensor is a distance sensor, a height sensor, a geomagnetic field sensor, an acceleration sensor, or the like.
In any one of the above solutions, preferably, the motor grader further includes: and the controller is connected with the sensor and the leveling control valve group and is used for controlling the leveling control valve group according to the state information of the scraper knife.
In this technical scheme, the leveler still includes the controller, and the controller is connected with the sensor and the control valves of making level for the valve group of making level is controlled according to the state information control of spiller, specifically, the direction that switches on of first switching-over valve of controller control and second switching-over valve to the operating condition of control lift cylinder, thereby adjustment spiller spatial position (the difference in height of spiller both sides), thereby guarantee the whole planarization on road surface behind bulldozing each time.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 shows a schematic structural view of a leveling control valve group according to the present invention;
FIG. 2 illustrates a schematic of a priority valve according to the present invention;
fig. 3 shows a schematic diagram of a grader control hydraulic system according to the present invention.
Wherein, the correspondence between the reference numbers and the component names in fig. 1 to 3 is:
the control system comprises a ground control hydraulic system, a 10 hydraulic pump, a 12 lifting oil cylinder, a 122 first lifting oil cylinder, a 124 second lifting oil cylinder, a 14 leveling control valve group, a 142 first reversing valve, a 144 second reversing valve, a 146 first balancing part, a 148 second balancing part, a 150 logic valve group, a 152 first shuttle valve, a 154 second shuttle valve, a 156 fourth shuttle valve, a 158 third shuttle valve, a 16 steering gear, an 18 priority valve, a 182 electromagnetic valve, a 184 two-position three-way valve, a 20 power source, a 22 first steering oil cylinder, a 24 second steering oil cylinder and a 26 hydraulic oil tank, wherein the ground control hydraulic system is controlled by the ground control system.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
A grader controlling hydraulic system according to some embodiments of the present disclosure is described below with reference to fig. 1-3.
In an embodiment of the present invention, preferably, as shown in fig. 1, 2 and 3, a grader control hydraulic system 1 is provided for a grader, the grader including a blade, wherein the grader control hydraulic system 1 includes: a work device hydraulic system; a hydraulic pump 10 for supplying hydraulic oil; the lifting oil cylinder 12 is used for controlling the lifting or the lowering of the scraper knife; the oil outlet of the leveling control valve group 14 is communicated with the lifting oil cylinder 12 and is used for controlling the lifting oil cylinder 12 to move; a steering gear 16 for controlling the steering of the grader; and a first port of the priority valve 18 is communicated with an oil outlet of the hydraulic pump 10, a second port of the priority valve 18 is communicated with an oil inlet of the leveling control valve group 14 and an oil inlet of the steering gear 16, and a third port of the priority valve 18 is communicated with an oil inlet of a hydraulic system of a working device.
In this embodiment, the grader includes a blade and a grader control hydraulic system 1, and the grader control hydraulic system 1 includes: the hydraulic system comprises an operation device hydraulic system, a hydraulic pump 10, a lifting oil cylinder 12, a leveling control valve group 14, a steering gear 16 and a priority valve 18, wherein the hydraulic pump 10 is used for providing hydraulic oil, a first port (P port) of the priority valve 18 is communicated with an oil outlet of the hydraulic pump 10, a second port (CF port) of the priority valve 18 is simultaneously communicated with an oil inlet of the leveling control valve group 14 and an oil inlet of the steering gear 16, when the steering gear 16 and the leveling valve group work, the hydraulic pump 10 inputs the hydraulic oil to the steering gear 16 and the leveling valve group through the priority valve 18, a third port (EF port) of the priority valve 18 is communicated with an oil inlet of the operation device hydraulic system, and when the operation device hydraulic system drives the operation device to work, the hydraulic valve inputs the hydraulic oil to the operation device hydraulic system through the priority valve 18. The oil outlets (a1 port, a2 port, B1 port, B2 port) of the leveling control valve group 14 are communicated with the lifting oil cylinders 12, the lifting oil cylinders 12 are used for controlling the lifting and descending of the scraper knife, generally, the number of the lifting oil cylinders 12 is two, the two lifting oil cylinders act on the left side and the right side of the scraper knife respectively, optionally, when the left side height of the scraper knife is lower or higher, the lifting oil cylinder 12 on the left side works, the height of the scraper knife is adjusted, and similarly, when the right side height of the scraper knife is lower or higher, the lifting oil cylinder 12 on the right side works, and finally, the heights of the left side and the right side of the scraper knife are. Therefore, the leveling control valve group 14 can adjust the space position of the blade (the height difference between two sides of the blade), so as to ensure the overall smoothness of the road surface after each bulldozing.
Optionally, a sensor is disposed on the blade, and is configured to detect a ground clearance value of the blade, compare the ground clearance value of the blade with a set value, and when the left side of the blade is lower than the set value and the right side of the blade is higher than the set value, the left lifting cylinder 12 performs a lifting action and the right lifting cylinder 12 performs a lowering action until the ground clearance values of the left and right sides of the blade are equal to the set value, where the set value is determined according to an actual use condition.
In an embodiment of the present invention, preferably, as shown in fig. 1, fig. 2 and fig. 3, the fourth port of the priority valve 18 is connected to the leveling valve set 14 and the steering gear 16, when the leveling valve set 14 or the steering gear 16 is in operation, the fourth port of the priority valve 18 is fed back with a signal, the first port of the priority valve 18 is communicated with the second port of the priority valve 18, when the leveling valve set 14 and the steering gear 16 are out of operation, the fourth port of the priority valve 18 is fed back with a signal, and the first port of the priority valve 18 is communicated with the third port of the priority valve 18.
In this embodiment, when the leveling control valve group 14 and/or the steering device 16 are/is operated, when the pressure value of the hydraulic oil at the fourth port of the priority valve 18 is greater than the preset value, the first port of the priority valve 18 is communicated with the second port of the priority valve 18, so as to ensure the continuous oil supply of the leveling control valve group 14 and the steering device 16; when the leveling control valve group 14 and the steering gear 16 do not work, the reversing valve and the steering gear 16 in the leveling control valve group 14 are in a middle core closing state, the first port of the priority valve 18 is communicated with the third port of the priority valve 18, and the hydraulic pump 10 supplies oil to the hydraulic system of the working device.
Optionally, a fifth port (T port) of the priority valve 18 is communicated with the hydraulic oil tank 26, the priority valve 18 includes a solenoid valve 182 and a two-position three-way valve 184, an LS port of the priority valve 18 is communicated with an LS port of the two-position three-way valve 184, the T port of the priority valve 18 is communicated with the LS port of the two-position three-way valve 184 through the solenoid valve 182, and the pressure value of the oil at the LS port of the two-position three-way valve 184 can be controlled by controlling the on-off state of the solenoid valve 182.
Alternatively, the hydraulic pump 10 is a gear pump.
Optionally, the priority valve 18 includes a two-position three-way valve 184, when the high-pressure hydraulic oil enters the control port of the priority valve 18, the high-pressure hydraulic oil further enters the LS port of the two-position three-way valve 184, when the pressure value of the oil at the LS port of the two-position three-way valve 184 is greater than the preset value, the spool of the two-position three-way valve 184 is in the left position, the P port of the priority valve 18 is communicated with the CF port, when the pressure value of the hydraulic oil at the control port of the priority valve 18 is lower, the spool of the two-position three-way valve 184 is in the right position, the P port of the priority valve 18 is communicated with the.
In an embodiment of the present invention, preferably, as shown in fig. 1, 2 and 3, the lift cylinder 12 includes a first lift cylinder 122 and a second lift cylinder 124; the leveling control valve bank 14 includes a first diverter valve 142 and a second diverter valve 144; the second port of the priority valve 18 communicates with the first port of the first direction valve 142 and the first port of the second direction valve 144; the second port of the first direction valve 142 is communicated with the rodless chamber of the first lift cylinder 122, the third port of the first direction valve 142 is communicated with the rod chamber of the first lift cylinder 122, and the fourth port of the first direction valve 142 is communicated with the hydraulic oil tank 26; the second port of the second direction valve 144 communicates with the rodless chamber of the second lift cylinder 124, the third port of the second direction valve 144 communicates with the rod chamber of the second lift cylinder 124, and the fourth port of the second direction valve 144 communicates with the hydraulic reservoir 26.
In this embodiment, the lift cylinder 12 includes a first lift cylinder 122 and a second lift cylinder 124, the piston rods of the first lift cylinder 122 and the second lift cylinder 124 are connected to the blade, the leveling control valve group 14 includes a first direction change valve 142 and a second direction change valve 144, the second port (CF port) of the priority valve 18 is communicated with the first port of the first direction change valve 142 and the first port of the second direction change valve 144, the second port of the first direction change valve 142 is communicated with the rodless chamber of the first lift cylinder 122, the third port of the first direction change valve 142 is communicated with the rod chamber of the first lift cylinder 122, the fourth port of the first direction change valve 142 is communicated with the hydraulic oil tank 26, the first direction change valve 142 controls the moving direction of the piston rod of the first lift cylinder 122 by controlling the input of hydraulic oil into the rodless chamber or the rod chamber of the first lift cylinder 122, the second port of the second direction change valve 144 is communicated with the rodless chamber of the second lift cylinder 124, the third port of the second direction valve 144 is communicated with the rod chamber of the second lift cylinder 124, the fourth port of the second direction valve 144 is communicated with the hydraulic oil tank 26, the second direction valve 144 controls the movement direction of the piston rod of the second lift cylinder 124 by controlling the hydraulic oil input into the rod chamber or the rod chamber of the second lift cylinder 124, wherein the fourth port of the first direction valve 142 and the fourth port of the second direction valve 144 are communicated with the hydraulic oil tank 26 through the T port of the leveling control valve group 14.
Alternatively, the piston rod of the first lift cylinder 122 is connected to the left or right side of the blade, and the piston rod of the second lift cylinder 124 is connected to the other side of the blade.
Optionally, the reversing valve is an electro-hydraulic proportional reversing valve, the first reversing valve 142 has a first control end Y1 and a second control end Y2, the first control end Y1 and the second control end Y2 are used for controlling the position of the valve spool, the second reversing valve 144 has a first control end Y3 and a second control end Y4, and the first control end Y3 and the second control end Y4 are used for controlling the position of the valve spool, so that the input ports are communicated with different output ports.
In one embodiment of the present invention, preferably, as shown in fig. 1 and 3, the first direction valve 142 is connected to the first lift cylinder 122 through a first balance member 146; the second direction valve 144 is connected to the second lift cylinder 124 through a second balance member 148.
In this embodiment, the first direction valve 142 is connected to the first lift cylinder 122 through a first balance member 146, and the second direction valve 144 is connected to the second lift cylinder 124 through a second balance member 148, and the balance valves are used to ensure the balance of hydraulic pressures at both ends, so as to improve the operation stability of the first lift cylinder 122 and the second lift cylinder 124.
Optionally, the first and second counterbalance sections 146 and 148 are counterbalance valves or hydraulic locks that are capable of locking the first and second lift cylinders 122 and 124 during operation of the grader, ensuring invariance of the spatial position of the blade and operational reliability.
In an embodiment of the present invention, preferably, as shown in fig. 1, fig. 2 and fig. 3, the leveling valve group 14 further includes: and a logic valve block 150 connected to the first directional valve 142, the second directional valve 144, the control port of the steering gear 16, and the fourth port of the priority valve 18.
In this embodiment, the leveling control valve group 14 further includes a logic valve group 150 connected to the first direction valve 142, the second direction valve 144, the control port of the steering gear 16 and the fourth port of the priority valve 18, specifically, the logic valve group 150 is connected to the oil outlets of the first direction valve 142 and the second direction valve 144, the logic valve group 150 compares the pressure value of the control oil output from the control port of the steering gear 16 with the pressure values of the hydraulic oil output from the first direction valve 142 and the second direction valve 144, the logic valve group 150 outputs the highest pressure value (through the hydraulic oil) to the fourth port of the priority valve 18, when the pressure value of the hydraulic oil output from the fourth port of the priority valve 18 is greater than the preset value, the first port of the priority valve 18 is communicated with the second port of the priority valve 18, so as to ensure the continuous oil supply of the leveling control valve group 14 and the steering gear 16; when the leveling control valve group 14 and the steering gear 16 do not work, the reversing valve and the steering gear 16 in the leveling control valve group 14 are in a middle core closing state, the first port of the priority valve 18 is communicated with the third port of the priority valve 18, and the hydraulic pump 10 supplies oil to the hydraulic system of the working device.
In an embodiment of the present invention, preferably, as shown in fig. 1, 2 and 3, the logic valve set 150 includes: a first shuttle valve 152, a first port of the first shuttle valve 152 being in communication with a second port of the first direction valve 142; a second shuttle valve 154, a first port of the second shuttle valve 154 being in communication with the control port of the diverter 16, a second port of the second shuttle valve 154 being in communication with the third port of the second directional valve 144; a third shuttle valve 158, a first port of the third shuttle valve 158 being in communication with the third port of the first direction valve 142, a second port of the third shuttle valve 158 being in communication with the third port of the first shuttle valve 152, a third port of the third shuttle valve 158 being in communication with the fourth port of the priority valve 18; a fourth shuttle valve 156, a first port of the fourth shuttle valve 156 being connected to the third port of the second shuttle valve 154, a second port of the fourth shuttle valve 156 being in communication with the third port of the second direction valve 144, and a third port of the fourth shuttle valve 156 being in communication with the second port of the first shuttle valve 152.
In this embodiment, the logic valve set 150 includes a first shuttle valve 152, a second shuttle valve 154, a third shuttle valve 158, and a fourth shuttle valve 156, the first port of the first shuttle valve 152 is in communication with the second port of the first direction valve 142, the first port of the second shuttle valve 154 is in communication with the control port of the diverter 16, the second port of the second shuttle valve 154 is in communication with the third port of the second direction valve 144, the first port of the third shuttle valve 158 is in communication with the third port of the first direction valve 142, the second port of the third shuttle valve 158 is in communication with the third port of the first shuttle valve 152, the third port of the third shuttle valve 158 is in communication with the fourth port of the priority valve 18, the first port of the fourth shuttle valve 156 is in communication with the third port of the second shuttle valve 154, the second port of the fourth shuttle valve 156 is in communication with the third port of the second direction valve 144, the third port of the fourth shuttle valve 156 is in communication with the second port of the first shuttle valve 152, the logic valve set 150 functions, the port having the highest pressure of the hydraulic oil output from the 5 ports, i.e., the control port of the steering gear 16, the second port of the first direction valve 142, the third port of the first direction valve 142, the second port of the second direction valve 144, and the third port of the second direction valve 144, is determined, and then the hydraulic oil in the port is output to the fourth port of the priority valve 18 through the third port of the third shuttle valve 158, i.e., the hydraulic oil having the highest pressure among the 5 ports is output to the fourth port of the priority valve 18, so that the priority valve 18 is operated in accordance with the pressure value.
In an embodiment of the present invention, preferably, as shown in fig. 3, the grader control hydraulic system 1 further includes: and the engine is connected with the hydraulic pump 10 and used for driving the hydraulic pump 10, and the engine is an internal combustion engine or an electric motor.
In this embodiment, the grader control hydraulic system 1 further includes a power source 20, where the power source 20 is used to drive the hydraulic pump 10 to deliver hydraulic oil, and the power source 20 may be an electric motor or an internal combustion engine.
In an embodiment of the present invention, preferably, as shown in fig. 1, fig. 2 and fig. 3, after the grader is started, the hydraulic pump 10 pumps oil to the priority valve 18, the oil is preferentially discharged from the CF port of the priority valve 18 and is shunted to the P port of the steering gear 16, and in addition, a path of oil is led from the P port of the steering gear 16 to the P port of the leveling control valve group 14; when the automatic leveling control hydraulic system works, the control oil from the LS port of the steering gear 16 and the four oil paths of the leveling control valve group 14 are compared in pressure and high pressure is obtained through a logic valve group 150 composed of 4 shuttle valves (a first shuttle valve 152, a second shuttle valve 154, a third shuttle valve 158 and a fourth shuttle valve 156), the obtained load feeds back the high-pressure oil to the LS control port of the priority valve 18, and the two-position three-way valve 184 of the priority valve 18 is in the left position, so that continuous oil supply of the leveling control hydraulic system (the lifting oil cylinder 12 and the leveling control valve group 14) is ensured; when the automatic leveling control hydraulic system or the steering gear 16 does not work, the leveling control valve set 14 and the middle position of the steering gear 16 are closed, and hydraulic oil is delivered to the hydraulic system of the working device from an EF port of the priority valve 18.
When the leveling control hydraulic system works, when the fact that the ground clearance of the first lifting oil cylinder 122 is higher than a set deviation value is detected, the Y1 electromagnet of the first reversing valve 142 is electrified, oil enters from a port P of the leveling control valve group 14, the oil flows out from a port A1 after the first reversing valve 142 and enters a rodless cavity of the first lifting oil cylinder 122, until the ground clearance of the scraper is equal to the set deviation value, the Y1 electromagnet of the first reversing valve 142 is electrified, oil supply to the rodless cavity of the first lifting oil cylinder 122 is stopped, and the ground clearance of the scraper is kept at a set value; similarly, when the height of the first lift cylinder 122 is lower than the set value and the height of the second lift cylinder 124 is higher than the set value, the Y2 electromagnet of the first direction valve 142 and the Y3 electromagnet of the second direction valve 144 are energized, the oil enters the rod chamber of the first lift cylinder 122 and the rodless chamber of the second lift cylinder 124, and until the height from the ground is equal to the set deviation value, the Y2 electromagnet of the first direction valve 142 and the Y3 electromagnet of the second direction valve 144 are de-energized, and the oil supply is stopped.
In an embodiment of the present invention, preferably, as shown in fig. 1, the grader control hydraulic system 1 further includes: the first steering oil cylinder 22 and the second steering oil cylinder 24 are used for achieving steering of the land leveler, the oil outlet of the steering gear 16 comprises a first oil outlet and a second oil outlet, the first oil outlet of the steering gear 16 is communicated with the rod cavity of the first steering oil cylinder 22 and the rodless cavity of the second steering oil cylinder 24, and the second oil outlet of the steering gear 16 is communicated with the rodless cavity of the first steering oil cylinder 22 and the rod cavity of the second steering oil cylinder 24.
Before the automatic leveling control hydraulic system of the land leveler works, a reference surface (used for a scraper height sensor to collect height signals) is firstly leveled on the left side or the right side of a construction site; when the automatic leveling control hydraulic system of the land leveler starts to work, the sensor detects the height, level and rotation signals of the scraper knife and transmits the signals to the controller, the signals are output after the calculation of the controller and transmitted to the automatic leveling control hydraulic system of the scraper knife, compensation control is carried out, the spatial position of the scraper knife is accurately controlled, and the smoothness of a construction surface is ensured.
In this embodiment, the grader control hydraulic system 1 further includes a first steering cylinder 22 and a second steering cylinder 24, the cylinders are used for realizing grader steering, the oil outlet of the steering gear 16 includes a first oil outlet (port a) and a second oil outlet (port B), the first oil outlet of the steering gear 16 is communicated with the rod cavity of the first steering cylinder 22 and the rodless cavity of the second steering cylinder 24, and the second oil outlet of the steering gear 16 is communicated with the rodless cavity of the first steering cylinder 22 and the rod cavity of the second steering cylinder 24, and is used for driving the piston rods of the first steering cylinder 22 and the second steering cylinder 24 to move in different directions.
In an embodiment of the present invention, preferably, as shown in fig. 1, the grader control hydraulic system 1 further includes: and the lift pump is connected with the lift cylinder 12 and used for driving the lift cylinder 12, and optionally, the lift pump is the hydraulic pump 10 in any one of the embodiments.
In an embodiment of the present invention, preferably, a grader is provided, including: the grader as in any of the embodiments above controls the hydraulic system; a scraper knife; and the sensor is arranged on the scraper knife and used for acquiring the state information of the scraper knife.
In this embodiment, the grader includes the grader control hydraulic system, blade, and sensor as in any of the above embodiments, the sensor is disposed on the blade and is used to collect the state information of the blade, and the state information of the blade may include height information, movement speed, acceleration, etc., and thus, the grader includes the grader control hydraulic system as in any of the above embodiments, thereby including all the advantages.
Alternatively, the sensor is a distance sensor, a height sensor, a geomagnetic field sensor, an acceleration sensor, or the like.
In an embodiment of the present invention, preferably, the grader further includes: and the controller is connected with the sensor and the leveling control valve group and is used for controlling the leveling control valve group according to the state information of the scraper knife.
In this embodiment, the grader still includes the controller, and the controller is connected with the sensor and the control valves of making level for the valve group of making level is controlled according to the state information control of spiller, specifically, the direction that switches on of first switching-over valve and second switching-over valve is controlled to the controller to the operating condition of control lift cylinder, thereby adjustment spiller spatial position (the difference in height of spiller both sides), thereby the whole planarization on assurance bulldozing back road surface each time.
In the description of the present invention, the terms "plurality" or "a plurality" refer to two or more, and unless otherwise specifically defined, the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention; the terms "connected," "mounted," "secured," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the description of the present invention, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means 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 invention. In the present disclosure, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. 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 above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A grader control hydraulic system for a grader, the grader including a blade, comprising:
a work device hydraulic system;
the hydraulic pump is used for providing hydraulic oil;
the lifting oil cylinder is used for controlling the lifting or the lowering of the scraper knife;
the oil outlet of the leveling control valve group is communicated with the lifting oil cylinder and is used for controlling the lifting oil cylinder to act;
the steering gear is used for controlling the land scraper to steer;
and a first port of the priority valve is communicated with an oil outlet of the hydraulic pump, a second port of the priority valve is communicated with an oil inlet of the leveling control valve group and an oil inlet of the steering gear, and a third port of the priority valve is communicated with an oil inlet of the hydraulic system of the operation device.
2. The grader control hydraulic system of claim 1,
the fourth mouth of priority valve with the control valves that makes level with the steering gear is connected make level the control valves that makes level or the steering gear during operation, feedback signal extremely the fourth mouth of priority valve, the first mouth of priority valve with the second mouth intercommunication of priority valve make level the control valves with the steering gear is not during operation, feedback signal extremely the fourth mouth of priority valve, the first mouth of priority valve with the third mouth intercommunication of priority valve.
3. The grader control hydraulic system of claim 2,
the lifting oil cylinder comprises a first lifting oil cylinder and a second lifting oil cylinder;
the leveling control valve group comprises a first reversing valve and a second reversing valve;
the second port of the priority valve is in communication with the first port of the first directional valve and the first port of the second directional valve;
the second port of the first reversing valve is communicated with the rodless cavity of the first lifting oil cylinder, the third port of the first reversing valve is communicated with the rod cavity of the first lifting oil cylinder, and the fourth port of the first reversing valve is communicated with a hydraulic oil tank;
and a second port of the second reversing valve is communicated with a rodless cavity of the second lifting oil cylinder, a third port of the second reversing valve is communicated with a rod cavity of the second lifting oil cylinder, and a fourth port of the second reversing valve is communicated with the hydraulic oil tank.
4. The grader control hydraulic system of claim 3,
the first reversing valve is connected with the first lifting oil cylinder through a first balance component;
and the second reversing valve is connected with the second lifting oil cylinder through a second balance component.
5. The grader control hydraulic system of claim 3, wherein the leveling valve set further comprises:
and the logic valve group is connected with the first reversing valve, the second reversing valve, the control port of the steering gear and the fourth port of the priority valve.
6. The grader control hydraulic system of claim 5, wherein the logic valve set comprises:
a first shuttle valve having a first port in communication with the second port of the first directional valve;
a second shuttle valve, a first port of the second shuttle valve being in communication with the control port of the diverter, a second port of the second shuttle valve being in communication with a third port of the second directional valve;
a third shuttle valve, a first port of the third shuttle valve being in communication with the third port of the first directional valve, a second port of the third shuttle valve being in communication with the third port of the first shuttle valve, a third port of the third shuttle valve being in communication with the fourth port of the priority valve;
and a first port of the fourth shuttle valve is connected with a third port of the second shuttle valve, a second port of the fourth shuttle valve is communicated with a second port of the second reversing valve, and a third port of the fourth shuttle valve is communicated with a second port of the first shuttle valve.
7. The grader control hydraulic system according to any of claims 1 to 6, further comprising:
and the power source is connected with the hydraulic pump and used for driving the hydraulic pump, and the power source is an internal combustion engine or an electric motor.
8. The grader control hydraulic system of claim 1, further comprising:
the first steering oil cylinder and the second steering oil cylinder are used for achieving steering of the land leveler, the oil outlet of the steering gear comprises a first oil outlet and a second oil outlet, the first oil outlet of the steering gear is communicated with the rod cavity of the first steering oil cylinder and the rod-free cavity of the second steering oil cylinder, and the second oil outlet of the steering gear is communicated with the rod-free cavity of the first steering oil cylinder and the rod cavity of the second steering oil cylinder.
9. A grader, comprising:
the grader control hydraulic system of any of claims 1-8;
a scraper knife;
and the sensor is arranged on the scraper knife and used for acquiring the state information of the scraper knife.
10. The grader of claim 9 further comprising:
and the controller is connected with the sensor and the leveling control valve group and is used for controlling the leveling control valve group according to the state information of the scraper knife.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921865721.3U CN211228657U (en) | 2019-11-01 | 2019-11-01 | Land leveler and land leveler control hydraulic system of land leveler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921865721.3U CN211228657U (en) | 2019-11-01 | 2019-11-01 | Land leveler and land leveler control hydraulic system of land leveler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211228657U true CN211228657U (en) | 2020-08-11 |
Family
ID=71938561
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921865721.3U Active CN211228657U (en) | 2019-11-01 | 2019-11-01 | Land leveler and land leveler control hydraulic system of land leveler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211228657U (en) |
-
2019
- 2019-11-01 CN CN201921865721.3U patent/CN211228657U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10408238B2 (en) | Control strategy for hydraulic actuator with a pair of independent metering valves | |
| US8483916B2 (en) | Hydraulic control system implementing pump torque limiting | |
| CN203892301U (en) | Meterless hydraulic system having multi-circuit recuperation | |
| CN203926235U (en) | Have many actuators loop without throttling hydraulic system | |
| US10787790B2 (en) | Work machine | |
| EP2910795B1 (en) | Work machine | |
| US9829014B2 (en) | Hydraulic system including independent metering valve with flowsharing | |
| US9932993B2 (en) | System and method for hydraulic energy recovery | |
| US9249879B2 (en) | Hydraulic drive system for hydraulic working machine | |
| JP6614695B2 (en) | Hydraulic actuator control circuit | |
| CN111102255B (en) | Travel control system for construction machine and travel control method for construction machine | |
| WO2016185682A1 (en) | System for hydraulically driving construction equipment | |
| CN109790857B (en) | Hydraulic drive system for construction machine | |
| US20130081382A1 (en) | Regeneration configuration for closed-loop hydraulic systems | |
| JP7085996B2 (en) | Work machine and control method of work machine | |
| CN107636318B (en) | Load sensing hydraulic system for construction machinery | |
| CN115038844B (en) | Hydraulic system | |
| EP3683453B1 (en) | Driving device of construction equipment | |
| US20140033697A1 (en) | Meterless hydraulic system having force modulation | |
| US20140033698A1 (en) | Meterless hydraulic system having force modulation | |
| CN211228657U (en) | Land leveler and land leveler control hydraulic system of land leveler | |
| KR20140010042A (en) | Load sense control with standby mode in case of overload | |
| CN111677704B (en) | Hydraulic system and engineering machinery | |
| CN112360833B (en) | Flow control system, flow control method and crane | |
| CN217713134U (en) | Hydraulic drive system and engineering machinery |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |