CN113914173A - Hydraulic control system of paver screed plate - Google Patents
Hydraulic control system of paver screed plate Download PDFInfo
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- CN113914173A CN113914173A CN202111267547.4A CN202111267547A CN113914173A CN 113914173 A CN113914173 A CN 113914173A CN 202111267547 A CN202111267547 A CN 202111267547A CN 113914173 A CN113914173 A CN 113914173A
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- 239000010720 hydraulic oil Substances 0.000 claims abstract description 61
- 239000003921 oil Substances 0.000 claims abstract description 38
- 238000010276 construction Methods 0.000 description 9
- 238000010409 ironing Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000001174 ascending effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000007373 indentation Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/48—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ
- E01C19/4866—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ with solely non-vibratory or non-percussive pressing or smoothing means for consolidating or finishing
- E01C19/4873—Apparatus designed for railless operation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Road Paving Machines (AREA)
Abstract
The invention discloses a hydraulic control system of a paver screed plate, which comprises an electric control overflow valve, a three-position four-way electromagnetic directional valve, a two-position two-way electromagnetic directional valve I, a two-position two-way electromagnetic directional valve II, a flow dividing and collecting valve, a first hydraulic oil cylinder, a second hydraulic oil cylinder, a three-position two-way electromagnetic directional valve III and a two-position three-way electric proportional pressure reducing valve; an inlet P1 and an outlet T1 of the electric control overflow valve are respectively connected with a main oil path P and an oil return path T, and a port P of the main oil path is connected with a pressure measuring port MP; the pressure port P2 and the oil return port T2 of the three-position four-way electromagnetic valve are respectively connected with the inlet P1 and the outlet T1 of the electric control overflow valve; outlets A2 and B2 of the three-position four-way electromagnetic valve are respectively connected with a P c port of the two-position two-way electromagnetic valve II and a Pa port of the two-position two-way electromagnetic valve I. The invention can steplessly adjust the load capacity during loading and unloading, and avoids the negative influence of paving quality caused by the unadjustable load capacity in the past.
Description
Technical Field
The invention relates to the technical field of hydraulic control systems of pavers, in particular to a hydraulic control system of a screed of a paver.
Background
The paver is one of important equipment in road building maintenance construction, is mainly used for paving various materials of a road base layer and a pavement, and directly influences the engineering quality of the whole construction pavement in the paving operation construction process by controlling and adjusting the state of a screed. At present, the control and adjustment of the state of a screed plate of a paver are mainly realized by a hydraulic control system. At present, most of the control on the functions of the screed plate only pursues the realization of the independent function and needs to be additionally provided with a hydraulic circuit for control, so that the circuit is complex and cannot meet the requirement of special construction, and the screed plate has no loading function. If the load shedding function is adopted, the paving thickness can be effectively improved; if the loading function is adopted, the problem of paving an extremely thin layer can be effectively solved.
The paving operation process of the paver generally comprises three stages of stopping, starting and paving, and in the stopping and starting process of the paver, because the stress state of the screed can be changed, if the screed is controlled improperly at the moment, the pavement defects such as bulges or indentations and the like can be caused on the pavement. In order to solve the problem, the lifting oil cylinder of most of the prior screed plates is locked in the processes of stopping and starting the paver so as to avoid the screed plate from generating displacement. But when the lifting oil cylinder is locked for a short time, the upper cavity of the lifting oil cylinder can be vacuumed to form negative pressure, and then the ironing plate can move upwards under the action of the supporting force of the bottom material, so that the road surface bulges and the road surface quality is influenced.
Chinese patent CN212000512U discloses a hydraulic system for a screed of a paver, which can only realize the basic functions of raising, lowering, floating and locking of the screed, but cannot realize the functions of load shedding and loading of the screed.
Chinese patent CN207161408U discloses a hydraulic control system for a screed of a paver, which can realize the functions of load shedding and loading of the screed, but cannot realize load shedding and loading and cannot automatically adjust in a stepless manner, so that different auxiliary loads required by the change of the construction width cannot be satisfied.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a hydraulic control system of a paver screed, which has the advantages of simple structure, reliable performance and clear logical relationship of electric appliances, can meet the functions of ascending, descending, floating, locking, load shedding, loading and the like required by the paver screed during working, and is convenient to popularize and apply; furthermore, when different paving widths are adopted, the negative influence on the construction quality caused by the fact that load reduction and load loading are not adjustable in the prior art is avoided, and the stepless adjusting function of load reduction and load loading is realized.
The technical scheme adopted by the invention for solving the problems is as follows: a hydraulic control system of a paver screed plate comprises an electric control overflow valve, a three-position four-way electromagnetic directional valve, a two-position two-way electromagnetic directional valve I, a two-position two-way electromagnetic directional valve II, a flow distributing and collecting valve, a first hydraulic oil cylinder, a second hydraulic oil cylinder, a two-position two-way electromagnetic directional valve III and a two-position three-way electric proportional pressure reducing valve;
an inlet P1 and an outlet T1 of the electric control overflow valve are respectively connected with a main oil path P and an oil return path T, and a port P of the main oil path is connected with a pressure measuring port MP; the pressure port P2 and the oil return port T2 of the three-position four-way electromagnetic valve are respectively connected with the inlet P1 and the outlet T1 of the electric control overflow valve; outlets A2 and B2 of the three-position four-way electromagnetic valve are respectively connected with a P c port of the two-position two-way electromagnetic valve II and a Pa port of the two-position two-way electromagnetic valve I;
the Pd port of the two-position two-way electromagnetic valve II is respectively connected with the rodless cavities of the first hydraulic oil cylinder and the second hydraulic oil cylinder, and the Pb port of the two-position two-way electromagnetic valve I is connected with the port A4 of the flow distributing and collecting valve; ports B4 and C4 of the flow distributing and collecting valve are respectively connected with rod cavities of the first hydraulic oil cylinder and the second hydraulic oil cylinder;
the port P8 of the two-position three-way electro-proportional pressure reducing valve is connected with the port PT of the main oil way, the port T8 of the two-position three-way electro-proportional pressure reducing valve is connected back to the hydraulic oil tank, the port A8 of the two-position three-way electro-proportional pressure reducing valve is connected with the port three P7 of the two-position two-way electromagnetic directional valve, and the port A8 is simultaneously connected with a pressure test point MP 1;
and an A7 port of the two-position two-way electromagnetic directional valve III is connected with rodless cavities or rod cavities of the first hydraulic oil cylinder and the second hydraulic oil cylinder.
Furthermore, a two-position three-way electromagnetic directional valve is arranged between the three two-position two-way electromagnetic directional valve and the first hydraulic oil cylinder and between the three two-position two-way electromagnetic directional valve and the second hydraulic oil cylinder, and an A7 port of the three two-position two-way electromagnetic directional valve is connected with a P5 port of the two-position three-way electromagnetic directional valve; a5 port of the two-position three-way electromagnetic directional valve is connected with rodless cavities of the first hydraulic oil cylinder and the second hydraulic oil cylinder, and a B5 port of the two-position three-way electromagnetic directional valve is connected with rod cavities of the first hydraulic oil cylinder and the second hydraulic oil cylinder.
Furthermore, one of the ports A5 and B5 of the two-position three-way electromagnetic directional valve is connected back to the oil tank, and only one of the load shedding function and the load loading function is realized.
Furthermore, the two-position three-way electromagnetic valve is replaced by a two-position two-way electromagnetic valve, and only the load shedding or loading function is realized.
Further, the electronic control overflow valve is an unadjustable overflow valve.
Further, the electronic control overflow valve is an adjustable overflow valve.
Furthermore, the middle position function of the three-position four-way electromagnetic valve is Y-shaped, namely a rod cavity, a rodless cavity and a hydraulic oil tank of the hydraulic oil cylinder can be communicated when the middle position function is realized.
Further, the two-position three-way electro-proportional pressure reducing valve is an adjustable pressure reducing valve.
Further, the two-position three-way electric proportional pressure reducing valve is an unadjustable pressure reducing valve.
Due to the application of the technical scheme, compared with the prior art, the invention has the following beneficial effects:
through the combined design of the hydraulic elements, the invention not only can meet the functional requirements of ascending, descending, floating, locking, load shedding, loading and the like required by the working of the ironing plate, but also can steplessly adjust the load capacity during the loading and the load shedding, and avoids the negative influence of the paving quality caused by the unadjustable load capacity in the past.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
In the figure:
the hydraulic control system comprises an electric control overflow valve 1, a three-position four-way electromagnetic directional valve 2, a two-position two-way electromagnetic directional valve I3.1, a two-position two-way electromagnetic directional valve II 3.2, a flow dividing and collecting valve 4, a two-position three-way electromagnetic directional valve 5, a first hydraulic oil cylinder 6.1, a second hydraulic oil cylinder 6.2, a two-position two-way electromagnetic directional valve III 7 and a two-position three-way electric proportional pressure reducing valve 8.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
Example 1:
referring to fig. 1, the hydraulic control system of the screed of the paver comprises an electric control overflow valve 1, a three-position four-way electromagnetic directional valve 2, a two-position two-way electromagnetic directional valve I3.1, a two-position two-way electromagnetic directional valve II 3.2, a flow dividing and collecting valve 4, a two-position three-way electromagnetic directional valve 5, a first hydraulic oil cylinder 6.1, a second hydraulic oil cylinder 6.2, a two-position two-way electromagnetic directional valve III 7 and a two-position three-way electric proportional pressure reducing valve 8.
An inlet P1 and an outlet T1 of the electronic control overflow valve 1 are respectively connected with a main oil path P and an oil return path T, and a port P of the main oil path is connected with a pressure measuring port MP;
the pressure port P2 and the oil return port T2 of the three-position four-way electromagnetic valve 2 are respectively connected with the inlet P1 and the outlet T1 of the electric control overflow valve 1; outlets A2 and B2 of the three-position four-way electromagnetic valve 2 are respectively connected with a P c port of a two-position two-way electromagnetic valve II 3.2 and a Pa port of a two-position two-way electromagnetic valve I3.1;
the Pd port of the two-position two-way electromagnetic valve II 3.2 is respectively connected with the rodless cavities of the first hydraulic oil cylinder 6.1 and the second hydraulic oil cylinder 6.2, and the Pb port of the two-position two-way electromagnetic valve I3.1 is connected with the port A4 of the flow distributing and collecting valve 4;
ports B4 and C4 of the flow distributing and collecting valve 4 are respectively connected with rod cavities of a first hydraulic oil cylinder 6.1 and a second hydraulic oil cylinder 6.2;
a P8 port of the two-position three-way electro-proportional pressure reducing valve 8 is connected with a PT port of a main oil way, a T8 port of the two-position three-way electro-proportional pressure reducing valve 8 is connected back to a hydraulic oil tank, an A8 port of the two-position three-way electro-proportional pressure reducing valve 8 is connected with a P7 port of a two-position two-way electromagnetic directional valve III 7, and an A8 port is simultaneously connected with a pressure test point MP 1;
the port A7 of the two-position two-way electromagnetic directional valve III 7 is connected with the port P5 of the two-position three-way electromagnetic directional valve 5;
the port A5 of the two-position three-way electromagnetic directional valve 5 is connected with the rodless cavities of the first hydraulic oil cylinder 6.1 and the second hydraulic oil cylinder 6.2, and the port B5 of the two-position three-way electromagnetic directional valve 5 is connected with the rod cavities of the first hydraulic oil cylinder (6.1) and the second hydraulic oil cylinder 6.2.
The electric control overflow valve 1 is an unadjustable overflow valve or an adjustable overflow valve and is used for controlling the pressure of a main loop.
The middle position function of the three-position four-way electromagnetic valve 2 is Y-shaped, namely, a rod cavity, a rodless cavity and a hydraulic oil tank of the hydraulic oil cylinder can be communicated when the middle position function is in the middle position.
The two-position three-way electric proportional pressure reducing valve 8 is an adjustable pressure reducing valve or an unadjustable pressure reducing valve and is used for loading and unloading adjustment.
One of the ports A5 and B5 of the two-position three-way electromagnetic directional valve 5 can be connected back to the oil tank, and only one of the load shedding or loading functions is realized; the two-position three-way electromagnetic valve 5 can also be a two-position two-way electromagnetic valve, and only realizes the load shedding or loading function; the two-position three-way electromagnetic valve 5 can also be cancelled, and the port A7 of the two-position two-way electromagnetic valve III 7 is directly connected with a rod cavity or a rodless cavity of a hydraulic oil cylinder to realize the function of load shedding or loading only.
Wherein the above mentioned hydraulic components may be integrated into one or more valve packs to realize the present control system.
The paver screed control system of the invention can realize the following functions of the paver screed, which are explained in detail as follows:
1. raising the ironing plate: the method comprises the steps of lifting the screed plate before the paver works to pre-adjust the paving thickness of the paver, and lifting the screed plate after the paving work is finished to maintain the screed plate.
The working principle is as follows:
when the screed of the paver rises, the electromagnets Y1, Y2.1, Y3.1 and Y3.2 are electrified, and the rest electromagnets are not electrified, at the moment, the main oil path P flows to a Pa port from a P2 port through a B2 port of a three-position four-way electromagnetic reversing valve I2, flows to an A4 port through a 3.1Pb port of a two-position two-way electromagnetic reversing valve I, and respectively reaches rod cavities of the two lifting oil cylinders through a flow dividing and collecting valve I4 and a flow dividing and collecting valve II to B4 and C4. Y1 is electrified, and automatically controlled overflow valve 1 is in operating condition, ensures that screed rising pressure is less than the setting value of automatically controlled overflow valve 1, plays the circuit protection effect. The MP port may test the screed plate rise state system pressure.
2. Descending the ironing plate: the paving thickness is adjusted by matching with the lifting action of the screed plate before construction.
The working principle is as follows:
when the screed of the paver descends, the electromagnets Y1, Y2.2, Y3.1 and Y3.2 are electrified, and the other electromagnets are not electrified, at the moment, the main oil path P flows from the port P2 to the port Pc through the port A2 of the three-position four-way electromagnetic reversing valve 2 and respectively reaches rod cavities of the two lifting oil cylinders through the port Pd of the two-position two-way electromagnetic reversing valve II 3.2. Y1 is electrified, and automatically controlled overflow valve 1 is in operating condition, ensures that screed rising pressure is less than the setting value of automatically controlled overflow valve 1, plays the return circuit protection effect. The MP port may test the screed down state system pressure.
3. Floating the ironing plate: in the paving construction, the rod cavity and the rodless cavity of the lifting oil cylinder are simultaneously communicated with the oil tank, so that the screed is in a floating state without the action of the oil cylinder force, and the screed is in a key of floating paving.
The working principle is as follows:
when the screed of the paver floats, the electromagnets Y3.1 and Y3.2 are electrified, the rest electromagnets are not electrified, and the rod cavity and the rodless cavity of the hydraulic oil cylinder are communicated with the hydraulic oil tank through the Y type of the three-position four-way electromagnetic reversing valve I2.
4. Locking the ironing plate: the method can be used for preventing the screed from being lifted by the hardened asphalt mixture to cause the road surface to bulge when the machine is stopped for waiting materials in the paving construction; or prevent the ironing plate from falling and causing the road surface indentation due to the loss of the force balance of the floating state; the method can also be used for forcibly paving the screed when the paver starts.
The working principle is as follows:
when the ironing plate is locked, all the electromagnets are not powered, at the moment, the rodless cavity of the hydraulic oil cylinder blocks oil flow through the two-position two-way electromagnetic reversing valve II 3.2, and the rod cavity of the hydraulic oil cylinder blocks oil flow through the two-position two-way electromagnetic reversing valve I3.1, so that the hydraulic oil cylinder cannot act.
5. Load shedding of the ironing plate: if the pre-paved mixture is loose, the screed plate sinks due to the fact that the screed plate cannot enter a floating paving state due to the fact that the weight of the screed plate is heavy, paving can not be conducted according to the required paving thickness, certain load needs to be applied to rod cavities of left and right lifting oil cylinders of the screed plate at the moment, and therefore the weight of the screed plate is reduced, and the screed plate enters the floating paving state.
The working principle is as follows:
when the paver screed plate is in deloading work, electromagnets Y3.1, Y3.2, Y7 and Y8 are electrified, and the rest electromagnets are not electrified, at the moment, a main oil path PT flows from a port P8 to a rod cavity of the hydraulic oil cylinder through a port A8 of a two-position three-way electromagnetic directional valve I8, a port A7 of a two-position two-way electromagnetic directional valve III 7 through a port P7 and a port A5 of a two-position three-way electromagnetic directional valve I5 through a port P5, so that the rod cavity of the hydraulic oil cylinder keeps certain pressure, and a port MP1 can test a deloading pressure value.
6. Loading a screed plate: the function requires that certain load is applied to rodless cavities of left and right lifting oil cylinders of the screed plate so as to increase the weight of the screed plate and enable the screed plate to enter a floating paving state.
The working principle is as follows:
when the paver screed plate is loaded to work, the electromagnets Y1, Y3.1, Y5, Y7 and Y8 are electrified, and the rest electromagnets are not electrified, at the moment, the main oil path PT flows from the port P8, through the port A8 of the two-position three-way electromagnetic reversing valve I8, through the port A7 of the two-position two-way electromagnetic reversing valve III 7 through the port P7, and through the port B5 of the two-position three-way electromagnetic reversing valve I5 through the port P5 to the rodless cavity of the hydraulic oil cylinder, so that the rodless cavity of the hydraulic oil cylinder keeps a certain pressure, and the port MP1 can test the loading pressure value.
In conclusion, the hydraulic control system of the screed of the paver can meet the functional requirements of ascending, descending, floating, locking, load shedding, loading and the like required by the screed during working through the combined design of the hydraulic elements, and can adjust the load capacity in a stepless manner during loading and unloading, thereby avoiding the adverse effect of paving quality caused by the unadjustable load capacity in the past.
In addition to the above embodiments, the present invention also includes other embodiments, and any technical solutions formed by equivalent transformation or equivalent replacement should fall within the scope of the claims of the present invention.
Claims (9)
1. The utility model provides a hydraulic control system of paver screed which characterized in that: the hydraulic control system comprises an electric control overflow valve (1), a three-position four-way electromagnetic directional valve (2), a two-position two-way electromagnetic directional valve I (3.1), a two-position two-way electromagnetic directional valve II (3.2), a flow dividing and collecting valve (4), a first hydraulic oil cylinder (6.1), a second hydraulic oil cylinder (6.2), a two-position two-way electromagnetic directional valve III (7) and a two-position three-way electric proportional pressure reducing valve (8);
an inlet P1 and an outlet T1 of the electronic control overflow valve (1) are respectively connected with a main oil path P and an oil return path T, and a port P of the main oil path is connected with a pressure measuring port MP; the pressure port P2 and the oil return port T2 of the three-position four-way electromagnetic valve (2) are respectively connected with the inlet P1 and the outlet T1 of the electric control overflow valve (1); outlets A2 and B2 of the three-position four-way electromagnetic valve (2) are respectively connected with a P c port of a two-position two-way electromagnetic valve II (3.2) and a Pa port of a two-position two-way electromagnetic valve I (3.1);
the Pd port of the two-position two-way electromagnetic valve II (3.2) is respectively connected with the rodless cavities of the first hydraulic oil cylinder (6.1) and the second hydraulic oil cylinder (6.2), and the Pb port of the two-position two-way electromagnetic valve I (3.1) is connected with the port A4 of the flow distributing and collecting valve (4); b4 and C4 ports of the flow distributing and collecting valve (4) are respectively connected with rod cavities of a first hydraulic oil cylinder (6.1) and a second hydraulic oil cylinder (6.2);
a P8 port of the two-position three-way electric proportional pressure reducing valve (8) is connected with a PT port of a main oil way, a T8 port of the two-position three-way electric proportional pressure reducing valve (8) is connected back to a hydraulic oil tank, an A8 port of the two-position three-way electric proportional pressure reducing valve (8) is connected with a P7 port of a three (7) two-position two-way electromagnetic directional valve, and an A8 port is simultaneously connected with a pressure test point MP 1;
and an A7 port of the two-position two-way electromagnetic directional valve III (7) is connected with rodless cavities or rod cavities of the first hydraulic oil cylinder (6.1) and the second hydraulic oil cylinder (6.2).
2. The hydraulic control system of a screed of a paver of claim 1 wherein: a two-position three-way electromagnetic directional valve (5) is further arranged between the two-position two-way electromagnetic directional valve III (7) and the first hydraulic oil cylinder (6.1) and the second hydraulic oil cylinder (6.2), and an A7 port of the two-position two-way electromagnetic directional valve III (7) is connected with a P5 port of the two-position three-way electromagnetic directional valve (5); the A5 port of the two-position three-way electromagnetic directional valve (5) is connected with the rodless cavities of the first hydraulic oil cylinder (6.1) and the second hydraulic oil cylinder (6.2), and the B5 port of the two-position three-way electromagnetic directional valve (5) is connected with the rod cavities of the first hydraulic oil cylinder (6.1) and the second hydraulic oil cylinder (6.2).
3. The hydraulic control system of a paver screed of claim 2 wherein: one of the ports A5 and B5 of the two-position three-way electromagnetic directional valve (5) is connected back to the oil tank, and only one of the load shedding or loading functions is realized.
4. The hydraulic control system of a paver screed of claim 2 wherein: the two-position three-way electromagnetic valve (5) is replaced by a two-position two-way electromagnetic valve, and only the load shedding or loading function is realized.
5. The hydraulic control system of a screed of a paver of claim 1 wherein: the electric control overflow valve (1) is an unadjustable overflow valve.
6. The hydraulic control system of a screed of a paver of claim 1 wherein: the electric control overflow valve (1) is an adjustable overflow valve.
7. The hydraulic control system of a screed of a paver of claim 1 wherein: the middle position function of the three-position four-way electromagnetic valve (2) is Y-shaped, namely a rod cavity, a rodless cavity and a hydraulic oil tank of the hydraulic oil cylinder can be communicated when the middle position function is in the middle position.
8. The hydraulic control system of a screed of a paver of claim 1 wherein: the two-position three-way electro-proportional pressure reducing valve (8) is an adjustable pressure reducing valve.
9. The hydraulic control system of a screed of a paver of claim 1 wherein: the two-position three-way electro-proportional pressure reducing valve (8) is an unadjustable pressure reducing valve.
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| CN202111267547.4A CN113914173A (en) | 2021-10-29 | 2021-10-29 | Hydraulic control system of paver screed plate |
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| CN202111267547.4A CN113914173A (en) | 2021-10-29 | 2021-10-29 | Hydraulic control system of paver screed plate |
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| CN107366648A (en) * | 2017-09-11 | 2017-11-21 | 徐工集团工程机械股份有限公司 | A kind of hydraulic control system of paver screed |
| EP3353349A1 (en) * | 2015-09-23 | 2018-08-01 | Volvo Construction Equipment AB | Method for operating a self-propelling road paver and road paver therefor |
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2021
- 2021-10-29 CN CN202111267547.4A patent/CN113914173A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102061656A (en) * | 2010-11-23 | 2011-05-18 | 中国二十二冶集团有限公司 | Assembly vehicle for ironing plate of paver |
| CN102491173A (en) * | 2011-12-12 | 2012-06-13 | 中联重科股份有限公司 | Crane and closed type winch negative power control system for crane |
| CN203009422U (en) * | 2012-12-11 | 2013-06-19 | 淮南唐兴液压机械有限责任公司 | Full-hydraulic transmission system of earth pressure balance tube push bench |
| EP3353349A1 (en) * | 2015-09-23 | 2018-08-01 | Volvo Construction Equipment AB | Method for operating a self-propelling road paver and road paver therefor |
| CN106480811A (en) * | 2016-01-07 | 2017-03-08 | 徐工集团工程机械股份有限公司 | A kind of levelling of paver system and paver |
| CN107366648A (en) * | 2017-09-11 | 2017-11-21 | 徐工集团工程机械股份有限公司 | A kind of hydraulic control system of paver screed |
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