CN103758808A - Multi-way valve and hydraulic control system - Google Patents
Multi-way valve and hydraulic control system Download PDFInfo
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- CN103758808A CN103758808A CN201410042838.7A CN201410042838A CN103758808A CN 103758808 A CN103758808 A CN 103758808A CN 201410042838 A CN201410042838 A CN 201410042838A CN 103758808 A CN103758808 A CN 103758808A
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Abstract
The invention relates to a multi-way valve and a hydraulic control system. A combined type of a plurality of working groups is adopted in the multi-way valve. Main reversing valves and corresponding pilot oil path on-off control structures are arranged in part of the working groups. The pilot oil path on-off control structures are used for controlling pilot pressure oil between pilot control oil ports and pilot control cavities of the main reversing valves to be supplied or interrupted so that working or unloading of the working groups corresponding to the main reversing valves can be achieved. Compared with an existing hydraulic control system, the hydraulic control system cam limit independent motion and is not provided with special manifold blocks for the main reversing valves of the working groups to control the pilot pressure oil, and therefore the hydraulic control system is simpler in structure and connecting pipeline.
Description
Technical field
The present invention relates to engineering machinery field, relate in particular to a kind of multi-way valve and hydraulic control system.
Background technique
Hoist, as a kind of Special Hoisting Equipment, need to realize following action conventionally: the suspension hook that rises and falls (hereinafter to be referred as: hoist), the operation such as the jib that rises and falls (hereinafter to be referred as luffing), revolution, walking.Because crane arm support height is limited, suspension hook hoists and too highly can damage jib, and suspension hook falls too lowly may cause the wire rope residue number of turns on elevator very little, and then causes the accident of wire rope and elevator disengaging; Jib angle can not be too large simultaneously, otherwise may cause the danger of jib hypsokinesis, and jib angle can not be too little, in order to avoid cause whole vehicle stability that the accident of overturning occurs not.In order to meet above-mentioned requirements; hoist can be equipped with the working state of a special limiter of moment control system (hereinafter to be referred as: power limit device) monitoring hoist conventionally; when reaching above-mentioned ultimate state, shield corresponding operating, thereby reach the object of safety operation.
For automatical control system, only need limit device directly to limit the controller output signal of corresponding operating by power, and for hydraulic control system, operator need operated pilot handle, by pilot handle, be output into the corresponding work connection of the pilot control pressure signal driving multi-way valve commutation that ratio changes, and then control corresponding actions.For the limit device of exerting all one's strength can work in hydraulic control system, way is that logic control valve is set between pilot handle and multi-way valve conventionally.As shown in Figure 1, for the integrated logic control device of existing a kind of height, it filters out maximum pressure signal in order to control pump variable by inner shuttle valve networking, by one-way valve, pilot control pressure signal is focused on to two solenoid directional control valves simultaneously, these two solenoid valves of power limit device control dead electricity can realize corresponding motion limits.But the valve piece complexity of this logic control device, connecting pipeline complexity, is difficult for investigation when inner member breaks down; And a certain action is subject in limited time, and the action identical with its moment direction also can be limited, for example hook up and be subject in limited time, luffing falls also can attonity.
On market, widely used another kind of control mode is to adopt an integrated valve block, on valve piece, for each action, a solenoid valve is set.Pilot handle Ge road pressure first passes through valve piece, is connected to the pilot control chamber of multi-way valve, limits the each solenoid valve of device control to obtain dead electricity realize motion limits by power.Its advantage is that each motion limits is independent mutually, and shortcoming is the control in order to realize pump, need to be used for filtering out maximum pilot control pressure at complicated shuttle valve group valve piece of guide oil Lu Shangzai series connection, and pipeline is more complicated.
Summary of the invention
The object of the invention is to propose a kind of multi-way valve and hydraulic control system, can coordinate force limit device realize independently motion limits, and valve block structure and connecting pipeline simpler.
For achieving the above object, the invention provides a kind of multi-way valve, adopt the combining form of multiple work connection, in some work connection, be provided with main reversing valve and corresponding guide oil way switch control structure, described guide oil way switch control structure is for controlling the break-make of the pilot pressure oil between the pilot control chamber of pilot control hydraulic fluid port and described main reversing valve, realizes work or off-load that work that described main reversing valve is corresponding joins.
Further, described multi-way valve also comprises pilot control pressure selection structure and guide's pressure relief, described pilot control pressure selection structure is for screening maximum pilot control pressure signal in each work connection of described multi-way valve, described guide's pressure relief is for during without pilot pressure oil, carrying out off-load to the pilot pressure oil in described pilot control pressure selection structure in the pilot control chamber of described main reversing valve.
Further, described guide oil way switch control structure comprises the first selector valve and the second selector valve, limit the signal output part of device to be connected with outside power, described the first selector valve is located at the first pilot control hydraulic fluid port of work connection corresponding to described guide oil way switch control structure to the oil circuit in the first pilot control chamber of described main reversing valve, described the second selector valve is located at the second pilot control hydraulic fluid port of work connection corresponding to described guide oil way switch control structure to the oil circuit in the second pilot control chamber of described main reversing valve, described the first selector valve is also connected respectively with the second selector valve the oil return circuit that work corresponding to described guide oil way switch control structure joins, by switching input or the off-load of the pilot pressure oil in the first pilot control chamber of main reversing valve described in described the first selector valve control, by switching input or the off-load of the pilot pressure oil in the second pilot control chamber of main reversing valve described in described the second selector valve control.
Further, described the first selector valve is obtaining under electricity condition, connects the oil circuit of described the first pilot control hydraulic fluid port to the first pilot control chamber of described main reversing valve; Described the first selector valve is under power failure state, disconnect the oil circuit of described the first pilot control hydraulic fluid port to the first pilot control chamber of described main reversing valve, and connect the first pilot control chamber of described main reversing valve to the oil circuit of the oil return circuit of work connection corresponding to described guide oil way switch control structure; Described the second selector valve is obtaining under electricity condition, connects the oil circuit of described the second pilot control hydraulic fluid port to the second pilot control chamber of described main reversing valve; Described the second selector valve is under power failure state, disconnect the oil circuit of described the second pilot control hydraulic fluid port to the second pilot control chamber of described main reversing valve, and connect the second pilot control chamber of described main reversing valve to the oil circuit of the oil return circuit of work connection corresponding to described guide oil way switch control structure.
Further, described pilot control pressure selection structure comprises the first one-way valve, the second one-way valve and master control oil circuit, the oil outlet of described the first one-way valve and the second one-way valve is all connected to described master control oil circuit, the filler opening of described the first one-way valve connects the first pilot control chamber of described the first pilot control hydraulic fluid port or described main reversing valve, the filler opening of described the second one-way valve connects the second pilot control chamber of described the second pilot control hydraulic fluid port or described main reversing valve, and described master control oil circuit is communicated with in each work connection of described multi-way valve.
Further, described pilot control pressure selection structure comprises the first shuttle valve, the second shuttle valve and master control oil circuit, two filler openings of described the first shuttle valve communicate with described the first pilot control hydraulic fluid port and the second pilot control hydraulic fluid port respectively, the oil outlet of the first shuttle valve in the oil outlet of described the first shuttle valve and adjacent work connection communicates with two filler openings of described the second shuttle valve respectively, the oil outlet of described the second shuttle valve is connected to described master control oil circuit, and described master control oil circuit is communicated with in each work connection of described multi-way valve.
Further, described the first selector valve, under power failure state, is connected the oil circuit of described the first pilot control hydraulic fluid port to the first pilot control chamber of described main reversing valve; Described the first selector valve is obtaining under electricity condition, disconnect the oil circuit of described the first pilot control hydraulic fluid port to the first pilot control chamber of described main reversing valve, and connect the first pilot control chamber of described main reversing valve to the oil circuit of the oil return circuit of work connection corresponding to described guide oil way switch control structure; Described the second selector valve, under power failure state, is connected the oil circuit of described the second pilot control hydraulic fluid port to the second pilot control chamber of described main reversing valve; Described the second selector valve is obtaining under electricity condition, disconnect the oil circuit of described the second pilot control hydraulic fluid port to the second pilot control chamber of described main reversing valve, and connect the second pilot control chamber of described main reversing valve to the oil circuit of the oil return circuit of work connection corresponding to described guide oil way switch control structure.
Further, described pilot control pressure selection structure comprises the first one-way valve, the second one-way valve and master control oil circuit, the oil outlet of described the first one-way valve and the second one-way valve is all connected to described master control oil circuit, the filler opening of described the first one-way valve connects the first pilot control chamber of described the first pilot control hydraulic fluid port or described main reversing valve, the filler opening of described the second one-way valve connects the second pilot control chamber of described the second pilot control hydraulic fluid port or described main reversing valve, and described master control oil circuit is communicated with in each work connection of described multi-way valve.
Further, described pilot control pressure selection structure comprises the first one-way valve, the first shuttle valve and master control oil circuit, the oil outlet of described the first one-way valve is connected to described master control oil circuit, the filler opening of described the first one-way valve communicates with the oil outlet of described the first shuttle valve, two filler openings of described the first shuttle valve communicate with described the first pilot control hydraulic fluid port and the second pilot control hydraulic fluid port respectively, and described master control oil circuit is communicated with in each work connection of described multi-way valve.
Further, described pilot control pressure selection structure comprises the first shuttle valve, the second shuttle valve and master control oil circuit, two filler openings of described the first shuttle valve communicate with described the first pilot control hydraulic fluid port and the second pilot control hydraulic fluid port respectively, the oil outlet of the first shuttle valve in the oil outlet of described the first shuttle valve and adjacent work connection communicates with two filler openings of described the second shuttle valve respectively, the oil outlet of described the second shuttle valve is connected to described master control oil circuit, and described master control oil circuit is communicated with in each work connection of described multi-way valve.
Further, described guide's pressure relief comprises damping and guide's draining oil circuit, described guide's draining oil circuit is communicated with in each work connection of described multi-way valve, and is external to fuel tank, and the two ends of described damping connect respectively described master control oil circuit and guide's draining oil circuit.
Further, on the oil circuit between described damping and described master control oil circuit, be also provided with filtrating equipment.
Further, also comprise the 3rd shuttle valve, in described multi-way valve, being divided into two groups of work by different main pump fuel feeding joins, two filler openings of described the 3rd shuttle valve are connected from two groups of each self-corresponding master control oil circuits of the connection of the work by different main pump fuel feeding respectively, and filter out maximum pilot control pressure signal from the oil outlet of described the 3rd shuttle valve.
For achieving the above object, the present invention also provides a kind of hydraulic control system, comprise at least one main pump, and described main pump has variable control mechanism, also comprise pilot pressure oil supply module, wherein, also comprise aforementioned any one multi-way valve, described multi-way valve is connected with described main pump and pilot pressure oil supply module respectively.
Further, comprise two main pumps, respectively the two groups of work connection in described multi-way valve is carried out to fuel feeding, described two main pumps adopt respectively independently variable control mechanism, and described two groups of work join master control oil circuit separately and be connected respectively to the variable control mechanism of each self-corresponding main pump.
Further, comprise two main pumps, respectively two groups of work connection in described multi-way valve are carried out to fuel feeding, described two main pumps adopt same variable control mechanism, and described same variable control mechanism receives described two groups of work and joins the maximum pilot control pressure signal that master control oil circuit separately filters out jointly.
Based on technique scheme, the present invention can control the pilot pressure oil supplying of main reversing valve in corresponding work connection in multi-way valve by the guide oil way switch control structure in each work connection, make user directly to realized each action, to carry out independently action control by pilot handle, and then coordinate force limit device is realized independently motion limits; The present invention, than existing hydraulic control system, can not only realize independently motion limits, and special integrated valve block is set to the main reversing valve of each work connection and carries out pilot pressure oil and control, therefore structurally or all more simple on connecting pipeline.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms the application's a part, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the hydraulic principle schematic diagram of the integrated logic control device of existing a kind of height.
Fig. 2 is an embodiment's of hydraulic control system of the present invention hydraulic principle schematic diagram.
Fig. 3 is another embodiment's of hydraulic control system of the present invention hydraulic principle schematic diagram.
The hydraulic principle schematic diagram of some work connection in several embodiments that Fig. 4-10 are multi-way valve of the present invention.
Description of reference numerals:
V-multi-way valve; V1～V7-work connection; P1, P2-filler opening; T1, T2-return opening; L-guide draining oil circuit; X1, x1 ', x2-master control oil circuit; X-maximum pilot control pressure signal; A1, a2-the first pilot control hydraulic fluid port; B1, b2-the second pilot control hydraulic fluid port.
1,1 '-main pump; 2,2 '-Variable Control structure; 3,3 '-filtrating equipment; 4,4 '-damping; 5,5 '-motor; 6a, 6a '-the first selector valve; 6b, 6b '-the second selector valve; 7a, 7a '-the first one-way valve; 7b, 7b '-the second one-way valve; 8a, 8a '-the first pilot control chamber; 8b, 8b '-the second pilot control chamber; 9,9 '-main reversing valve; The 10-the three shuttle valve; 11, the 11 '-the first shuttle valve; 12, the 12 '-the second shuttle valve.
Embodiment
Below by drawings and Examples, technological scheme of the present invention is described in further detail.
The invention provides a kind of multi-way valve, adopt the combining form of example multiple work connection as shown in Figures 2 and 3.In Fig. 2 and Fig. 3, multi-way valve V is comprised of the connection V1-V7 that works, and wherein work connection V1, V7, for connecting main pump 1,1 ', therefore can be referred to as oil-feed connection, work connection V4 between two groups of work connection V2-V3 and V5-V6, connection in the middle of can being referred to as.Wherein in work connection V2-V3, V5-V6, be all provided with separately main reversing valve and corresponding guide oil way switch control structure, Fig. 2 and Fig. 3 have all depicted the hydraulic principle structure of corresponding main reversing valve 9 and 9 ' as an example of work connection V2 and V6 example, because the internal hydraulic pressure theory structure of each work connection is more approaching, therefore omitted the drafting of the internal hydraulic pressure theory structure of some work connection.Certainly, also allow other work connection to be different from the internal hydraulic pressure theory structure having illustrated in figure, also thought of the present invention can be applied in to the multi-way valve of single main pump fuel feeding, or still less work connection or multi-way valve that more multiplex (MUX) does to join.
In Fig. 2 and Fig. 3, take work connection V2 as example, guide oil way switch control structure, for controlling the break-make of the first pilot control hydraulic fluid port a1, the pilot pressure oil of the second pilot control hydraulic fluid port b1 respectively and between pilot control chamber 8a, the 8b of main reversing valve 9, realizes work or the off-load of the work connection of main reversing valve 9 correspondences.
In another embodiment, multi-way valve V can further include pilot control pressure selection structure and guide's pressure relief, pilot control pressure selection structure is for screening maximum pilot control pressure signal in each work connection of multi-way valve V, guide's pressure relief is for during without pilot pressure oil, carrying out off-load to the pilot pressure oil in pilot control pressure selection structure in the pilot control chamber of main reversing valve.The explanation one by one by reference to the accompanying drawings in the back of the specific implementation of pilot control pressure selection structure and guide's pressure relief wouldn't be described in detail herein.
In the multi-way valve shown in Fig. 2 and Fig. 3, take work connection V2 as example, guide oil way switch control structure comprises the first selector valve 6a and the second selector valve 6b, the first selector valve 6a all limits the signal output part of device (not shown) to be connected with outside power with the second selector valve 6b, can limit the signal of device output to switch according to power.The first selector valve 6a is located at the first pilot control hydraulic fluid port a1 of work connection V2 to the oil circuit of the first pilot control chamber 8a of main reversing valve 9, the second selector valve 6b is located at the second pilot control hydraulic fluid port b1 of work connection V2 to the oil circuit of the second pilot control chamber 8b of main reversing valve 9, the also oil return circuit L of connection work connection V2 respectively of the first selector valve 6a and the second selector valve 6b, by switching the first selector valve 6a, control input or the off-load of the pilot pressure oil in the first pilot control chamber 8a of main reversing valve 9, by switching the second selector valve 6b, control input or the off-load of the pilot pressure oil in the second pilot control chamber 8b of main reversing valve 9.
By the design of above-mentioned guide oil way switch control structure, make can directly be fed to by the first selector valve and the second selector valve from the pilot pressure oil of the pilot pressure oil supply module of multi-way valve outside the first pilot control chamber and the second pilot control chamber of main reversing valve, user can control by handling pilot handle the stroke of the spool of main reversing valve, and power limit device can be by maximal work feedback of status on the first selector valve and the second selector valve, to control timely pilot pressure oil supplying, and then the every kind of right action of limit device of exerting all one's strength limits.Structurally, do not need to arrange special logic control valve, power limit device can directly be made control to the first selector valve and second selector valve of each work connection, and pilot pressure oil can directly enter into work connection, need not be through the integrated valve block of integrated electric magnet valve, therefore structure be connected oil circuit on all more simple compared with existing structure, thereby convenient processing installation and maintenance misarrangement.
For work connection, its inner guide oil way switch control structure can have multiple way of realization, the guide oil way switch control structure of for example, working in Fig. 2, Fig. 3 in connection V2, the first selector valve 6a is obtaining under electricity condition, connect the oil circuit of the first pilot control hydraulic fluid port a1 to the first pilot control chamber 8a of main reversing valve 9, under power failure state, disconnect the oil circuit of the first pilot control hydraulic fluid port a1 to the first pilot control chamber 8a of main reversing valve 9, and connect the first pilot control chamber 8a of main reversing valve 9 to the oil circuit of the oil return circuit L of work connection V2.The second selector valve 6b is obtaining under electricity condition, connect the oil circuit of the second pilot control hydraulic fluid port b1 to the second pilot control chamber 8b of main reversing valve 9, under power failure state, disconnect the oil circuit of the second pilot control hydraulic fluid port b1 to the second pilot control chamber 8b of main reversing valve 9, and connect the second pilot control chamber 8b of main reversing valve 9 to the oil circuit of the oil return circuit L of work connection V2.
For above-mentioned guide oil way switch control structure, adoptable pilot control pressure selection structure comprises the first one-way valve 7a, the second one-way valve 7b and master control oil circuit x1, master control oil circuit x1 is communicated with in each work connection of multi-way valve V, and the oil outlet of the first one-way valve 7a and the second one-way valve 7b is all connected to master control oil circuit x1.As shown in Fig. 4 and Fig. 7, the filler opening of the first one-way valve 7a and the second one-way valve 7b is connected respectively the first pilot control hydraulic fluid port a1 and the second pilot control hydraulic fluid port b1.Like this, when the first selector valve 6a is during in power failure state, the pilot pressure oil of the first pilot control hydraulic fluid port a1 enters into master control oil circuit x1 by the first one-way valve 7a, and when the first selector valve 6a is when obtaining electricity condition, the pilot pressure oil content of the first pilot control hydraulic fluid port a1 does not enter the first pilot control chamber 8a and master control oil circuit x1.
As shown in Fig. 2,3 and 5, the filler opening of the first one-way valve 7a and the second one-way valve 7b can be also the first pilot control chamber 8a and the second pilot control chamber 8b that is connected respectively main reversing valve 9.Like this, when the first selector valve 6a is during in power failure state, the pilot pressure oil of the first pilot control hydraulic fluid port a1 can not enter into master control oil circuit x1 by the first one-way valve 7a, and when the first selector valve 6a is when obtaining electricity condition, the pilot pressure oil of the first pilot control hydraulic fluid port a1 enters the first pilot control chamber 8a, and enters into master control oil circuit x1 by the first one-way valve 7a.
In a further embodiment, the processing mode that obtains power failure state of above-mentioned the first selector valve and the second selector valve can also be: the first selector valve 6a is under power failure state, connect the oil circuit of the first pilot control hydraulic fluid port a1 to the first pilot control chamber 8a of main reversing valve 9, obtaining under electricity condition, disconnect the oil circuit of the first pilot control hydraulic fluid port a1 to the first pilot control chamber 8a of main reversing valve 9, and connect the first pilot control chamber 8a of main reversing valve 9 to the oil circuit of the oil return circuit L of work connection V2.The second selector valve 6b is under power failure state, connect the oil circuit of the second pilot control hydraulic fluid port b1 to the second pilot control chamber 8b of main reversing valve 9, obtaining under electricity condition, disconnect the oil circuit of the second pilot control hydraulic fluid port b1 to the second pilot control chamber 8b of main reversing valve 9, and connect the second pilot control chamber 8b of main reversing valve 9 to the oil circuit of the oil return circuit L of work connection V2.
For above-mentioned guide oil way switch control structure, adoptable pilot control pressure selection structure comprises the first one-way valve 7a, the second one-way valve 7b and master control oil circuit x1, master control oil circuit x1 is communicated with in each work connection of multi-way valve V, and the oil outlet of the first one-way valve 7a and the second one-way valve 7b is all connected to master control oil circuit x1.As shown in Figure 6, the filler opening of the first one-way valve 7a and the second one-way valve 7b is connected respectively the first pilot control hydraulic fluid port a1 and the second pilot control hydraulic fluid port b1.Like this, when the first selector valve 6a is during in power failure state, the pilot pressure oil of the first pilot control hydraulic fluid port a1 enters into master control oil circuit x1 by the first one-way valve 7a, and enter the first pilot control chamber 8a simultaneously, and when the first selector valve 6a is when obtaining electricity condition, by the first one-way valve 7a, enter into master control oil circuit x1.
As shown in Figure 8, the filler opening of the first one-way valve 7a and the second one-way valve 7b can be to be also connected respectively the first pilot control hydraulic fluid port a1 and the second pilot control chamber 8b.In other embodiments, can be also the first pilot control chamber 8a and the second pilot control chamber 8b that connects respectively main reversing valve 9.
Except above-mentioned described several pilot control pressure selection structures, can also shuttle valve or shuttle valve network be set at guide's pilot pressure choice structure, for example, in Fig. 9, pilot control pressure selection structure comprises the first one-way valve 7a, the first shuttle valve 11 and master control oil circuit x1, master control oil circuit x1 is communicated with in each work connection of multi-way valve V, the oil outlet of the first one-way valve 7a is connected to master control oil circuit x1, the filler opening of the first one-way valve 7a communicates with the oil outlet of the first shuttle valve 11, two filler openings of the first shuttle valve 11 communicate with the first pilot control hydraulic fluid port a1 and the second pilot control hydraulic fluid port b1 respectively.The first shuttle valve 11 can play larger pilot control pressure signal in the pilot pressure oil of the first pilot control hydraulic fluid port a1 and the second pilot control hydraulic fluid port b1 supply is linked in master control oil circuit x1.
And in Figure 10, two adjacent work connection have all adopted close shuttle valve network, and the setting of having saved one-way valve, wherein the pilot control pressure selection structure of left side work connection comprises the first shuttle valve 11, the second shuttle valve 12 and master control oil circuit x1, and master control oil circuit x1 is communicated with in each work connection of multi-way valve.Two filler openings of the first shuttle valve 11 communicate with the first pilot control hydraulic fluid port a1 and the second pilot control hydraulic fluid port b1 respectively, the oil outlet of the first shuttle valve 11 ' in the oil outlet of the first shuttle valve 11 and adjacent work connection (i.e. work connection in right side in figure) communicates with two filler openings of the second shuttle valve 12 respectively, and the oil outlet of the second shuttle valve 12 is connected to master control oil circuit x1.For right side work connection, two filler openings of the first shuttle valve 11 ' communicate with the first pilot control hydraulic fluid port a2 and the second pilot control hydraulic fluid port b2 respectively, and the adjacent work in the oil outlet of the first shuttle valve 11 ' and right side joins the pilot pressure oil content filtering out does not receive two filler openings of the second shuttle valve 12 '.By such structure, just can will in the pilot pressure oil of each pilot control hydraulic fluid port in multiple work connection, filter out maximum pilot control pressure signal.
The shuttle valve network being similar in Figure 10 also can be suitable for following situation: the first selector valve is obtaining under electricity condition, connects the oil circuit of the first pilot control hydraulic fluid port to the first pilot control chamber of main reversing valve; The first selector valve, under power failure state, disconnects the oil circuit of the first pilot control hydraulic fluid port to the first pilot control chamber of main reversing valve, and connects the first pilot control chamber of main reversing valve to the oil circuit of the oil return circuit of work connection corresponding to guide oil way switch control structure; The second selector valve is obtaining under electricity condition, connects the oil circuit of the second pilot control hydraulic fluid port to the second pilot control chamber of main reversing valve; The second selector valve, under power failure state, disconnects the oil circuit of the second pilot control hydraulic fluid port to the second pilot control chamber of main reversing valve, and connects the second pilot control chamber of main reversing valve to the oil circuit of the oil return circuit of work connection corresponding to guide oil way switch control structure.The specific constructive form of the shuttle valve network under this situation is in like manner known, repeats no more here.
In multi-way valve V, also include guide's pressure relief, while being used in the pilot control chamber of main reversing valve without pilot pressure oil, the pilot pressure oil in pilot control pressure selection structure is carried out to off-load.Referring to figs. 2 and 3, guide's pressure relief comprises damping 4,4 ' and guide's draining oil circuit L, guide's draining oil circuit L is communicated with in each work connection of multi-way valve V, and is external to fuel tank T, and damping 4, the 4 ' work that can be separately positioned on multi-way valve V join in V1 and work connection V7.The two ends of damping 4 connect respectively master control oil circuit x1 and guide's draining oil circuit L, and the two ends of damping 4 ' connect respectively master control oil circuit x2 and guide's draining oil circuit L.
Take the guide's pressure relief in work connection V1 as example, when power limit device receives the signal that limit switch sends, can for example, to the first selector valve 6a output signal of guide oil way switch control structure in relevant work connection (connection V2 works), make it disconnect the oil circuit of the first pilot control hydraulic fluid port a1 to the first pilot control chamber 8a of main reversing valve 9, and pilot pressure oil in the first pilot control chamber 8a flows back to oil cylinder T by guide's draining oil circuit L, pressure signal in master control oil circuit x1 arrives guide's draining oil circuit L by damping 4, the variable control mechanism 2 of main pump 1 makes the flow of main pump 1 be reduced to rapidly zero under the variation of the pressure signal of master control oil circuit x1, and then complete the pressure release of main pump 1.
In working order, pilot pressure oil in master control oil circuit x1 also can flow back into guide's draining oil circuit L by damping 4, but because the aperture of damping 4 is very little, through-current capability is very low, and the flow-rate ratio of pilot pressure oil is larger, therefore can't have influence on the pilot control pressure signal of the master control oil circuit x1 under working state.For fear of the contaminated thing of damping 4, stop up, can also further between damping 4 and master control oil circuit x1, filtrating equipment 3 be set, improve contamination resistance.Accordingly, filtrating equipment 3 ' can be arranged between damping 4 ' and master control oil circuit x2.
For multi-way valve V as shown in Figure 3, inside is divided into two groups of work by different main pump fuel feeding and joins, can the 3rd shuttle valve 10 be set at centre connection, two filler openings of the 3rd shuttle valve 10 are connected with x2 from two groups of each self-corresponding master control oil circuit x1 of the connection of the work by different main pump fuel feeding respectively, and filter out maximum pilot control pressure signal from the oil outlet of the 3rd shuttle valve 10.
Each embodiment of above-mentioned multi-way valve can be applied in the hydraulic control system of all kinds of engineering machinery, the hydraulic control system of for example hoist.In these hydraulic control systems, can comprise at least one main pump, and main pump has variable control mechanism, also comprise the embodiment of pilot pressure oil supply module and any multi-way valve described above, multi-way valve is connected with main pump and pilot pressure oil supply module respectively.
In Fig. 2 and Fig. 3, all show the hydraulic control system of two main pumps, the hydraulic control system of in fact single main pump can adopt multi-way valve of the present invention too, and concrete structure can, with reference to figure 2, just no longer describe in detail here.In hydraulic control system shown in Fig. 2, main pump 1 and 1 ' carries out fuel feeding to two groups of work connection in multi-way valve V respectively by oil inlet P 1 and P2, main pump 1 and 1 ' adopts respectively independently variable control mechanism, and two groups of work joins master control oil circuit x1 separately and x2, is connected respectively to the variable control mechanism 2 and 2 ' of each self-corresponding main pump.
In the hydraulic control system shown in Fig. 3, main pump 1 and 1 ' adopts same variable control mechanism 2, and receiving two groups of work, this variable control mechanism 2 joins the maximum pilot control pressure signal X that master control oil circuit separately filters out jointly, and by this SC sigmal control variable control mechanism 2, thereby obtain the control to main pump 1 and 1 ' same traffic.
In the embodiment of another hydraulic control system, the variable control mechanism of main pump can be automatic program control or pass through other external form controls, master control oil circuit without multi-way valve provides pilot control pressure signal, in this case, can adopt the multi-way valve that pilot control pressure selection structure is not set.
With the hydraulic system shown in Fig. 2, its working procedure being realized is once described for example below, this hydraulic system is the hydraulic system of hoist, wherein action actuating mechanism is motor 5 and 5 ' in this example, and two groups of work of multi-way valve V join respectively by main pump 1 and 1 ' fuel feeding, and by master control oil circuit x1 and x2, respectively variable control mechanism 2 and 2 ' are controlled respectively.Describing during working procedure, consider that the internal structure of work connection V2 in Fig. 2 and V6 is approximate, therefore at this, only the working procedure of work connection V2 is described, the working procedure of other work connection can be spreaded to thus, no longer describes in detail here.
1, holding state: pilot pressure oil supply module does not carry out fuel feeding to multi-way valve V, the first pilot control hydraulic fluid port a1 of work connection V2 and the second pilot control hydraulic fluid port b1 are all without pilot control pressure, the first pilot control chamber 8a of main reversing valve 9 and the second pilot control chamber 8b communicate with guide's draining oil circuit L by the first selector valve 6a and the second selector valve 6b respectively, in pressure release state.The spool of main reversing valve 9 is in meta, and the pressure oil that main pump 1 is exported successively through each work connection, is being got back to fuel tank T by oil return T1 by oil inlet P 1, and now main pump 1 is in pressure release state.
2, working state: suppose that motor 5 controls the elevator that hoists, need to hook up operation, now driver manually to make the first selector valve 6a obtain electric, the first selector valve 6a is switched to left position, the first pilot control hydraulic fluid port a1 is communicated with the first pilot control chamber 8a of main reversing valve 9.Then driver's operation pilot handle, pilot control pressure is successively by the first pilot control hydraulic fluid port a1 and the first selector valve 6a, and wherein a road pressure signal enters the first pilot control chamber 8a, and the spool that promotes main reversing valve 9 moves down; Another road pressure signal logical the first one-way valve 7a enters into master control oil circuit x1, and finally reaches the variable control mechanism 2 of main pump 1, and then controls output flow and the proportional variation of master control pressure x1 of main pump 1.
Pressure oil that main pump 1 is exported arrives motor 5 through the upper working position passage of oil inlet P 1 and main reversing valve 9, and drive motor 5 rotates and then realizes and hook up operation.When operation is subject to multiple action that main pump 1 controls, owing to being provided with the one-way valve of pilot control pressure selection oil circuit in each work connection, in each work connection, only have maximum pilot control pressure signal can enter into total pilot control oil circuit x1, therefore main pump 1 is all the time according to maximum pilot control pressure signal output flow, thereby meets the traffic demand of each multi-way valve.
3, pressure release state: always rotate when motor 5 drives the elevator that hoists, until rising to rise to while approaching maximum lifting height, lifting hook will trigger height limit switch, power limit device receives after the signal that limit switch sends, output control signal makes to control the first selector valve 6a dead electricity that hoists and move, the first selector valve 6a gets back to right position under spring-force driven dual, the passage of the first pilot control chamber 8a and the first pilot control hydraulic fluid port a1 disconnects, channel connection with guide's draining oil circuit L, pressure signal pressure release in the first pilot control chamber 8a, main reversing valve 9 is moved back into interposition under spring-force driven dual.Main pump 1 pressure oil output no longer enters motor 5, and motor 5 stops the rotation, thereby lifting hook stop motion has reached the object of safe spacing.The damping 4 that pressure signal in master control oil circuit x1 joins in V1 by work is communicated with and realizes pressure release with guide's draining oil circuit L, and the flow of main pump 1 also reduces to rapidly zero thereupon, realizes main pump pressure release.
The control principle of the corresponding work connection of the working procedure of other actions of multi-way valve and another main pump, with above identical or close, does not repeat them here.
The description of structure, principle and working procedure by above-described embodiment, is appreciated that the present invention compared with prior art, at least one of has the following advantages:
1, guide oil way switch control structure makes user directly to realized each action, carry out independently action control by pilot handle, and then coordinate force limit device is realized independently motion limits.
2,, by maximum pilot control pressure signal in each work connection of pilot control pressure selection Structure Selection, realize the oil pump Variable Control of each work connection of multi-way valve.
3, the element dispersed placement of pilot control pressure selection structure, in the some work connection of multi-way valve, is compared to the scheme that in the past adopts logical valve piece, and oil circuit is more clear, more easily judgement while breaking down, and the maintainability of system improves.
4, in hydraulic control system, can realize pilot handle and be connected directly to multi-way valve, middle without complicated logical valve or solenoid valve integrated valve block and shuttle valve group valve piece are set.Therefore, first rodding has obtained simplification to a great extent, makes car load pipe-line layout more succinct, and service clearance is larger, and cost is lower.
5, multi-way valve has maximum pilot control pressure selection function, can pick up very easily this pressure pump is controlled.In double pump system, both can pick up the maximum pilot control pressure of each single pump, also can pick up total maximum pilot control pressure, can adapt to the control requirement of the variable displacement pump of different control forms.
Finally should be noted that: above embodiment is only in order to illustrate that technological scheme of the present invention is not intended to limit; Although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the field are to be understood that: still can modify or part technical characteristics is equal to replacement the specific embodiment of the present invention; And not departing from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technological scheme scope of request protection of the present invention.
Claims (16)
1. a multi-way valve, it is characterized in that, adopt the combining form of multiple work connection, in some work connection, be provided with main reversing valve and corresponding guide oil way switch control structure, described guide oil way switch control structure is for controlling the break-make of the pilot pressure oil between the pilot control chamber of pilot control hydraulic fluid port and described main reversing valve, realizes work or off-load that work that described main reversing valve is corresponding joins.
2. multi-way valve according to claim 1, it is characterized in that, described multi-way valve also comprises pilot control pressure selection structure and guide's pressure relief, described pilot control pressure selection structure is for screening maximum pilot control pressure signal in each work connection of described multi-way valve, described guide's pressure relief is for during without pilot pressure oil, carrying out off-load to the pilot pressure oil in described pilot control pressure selection structure in the pilot control chamber of described main reversing valve.
3. multi-way valve according to claim 2, it is characterized in that, described guide oil way switch control structure comprises the first selector valve and the second selector valve, limit the signal output part of device to be connected with outside power, described the first selector valve is located at the first pilot control hydraulic fluid port of work connection corresponding to described guide oil way switch control structure to the oil circuit in the first pilot control chamber of described main reversing valve, described the second selector valve is located at the second pilot control hydraulic fluid port of work connection corresponding to described guide oil way switch control structure to the oil circuit in the second pilot control chamber of described main reversing valve, described the first selector valve is also connected respectively with the second selector valve the oil return circuit that work corresponding to described guide oil way switch control structure joins, by switching input or the off-load of the pilot pressure oil in the first pilot control chamber of main reversing valve described in described the first selector valve control, by switching input or the off-load of the pilot pressure oil in the second pilot control chamber of main reversing valve described in described the second selector valve control.
4. multi-way valve according to claim 3, is characterized in that, described the first selector valve is obtaining under electricity condition, connects the oil circuit of described the first pilot control hydraulic fluid port to the first pilot control chamber of described main reversing valve; Described the first selector valve is under power failure state, disconnect the oil circuit of described the first pilot control hydraulic fluid port to the first pilot control chamber of described main reversing valve, and connect the first pilot control chamber of described main reversing valve to the oil circuit of the oil return circuit of work connection corresponding to described guide oil way switch control structure; Described the second selector valve is obtaining under electricity condition, connects the oil circuit of described the second pilot control hydraulic fluid port to the second pilot control chamber of described main reversing valve; Described the second selector valve is under power failure state, disconnect the oil circuit of described the second pilot control hydraulic fluid port to the second pilot control chamber of described main reversing valve, and connect the second pilot control chamber of described main reversing valve to the oil circuit of the oil return circuit of work connection corresponding to described guide oil way switch control structure.
5. multi-way valve according to claim 4, it is characterized in that, described pilot control pressure selection structure comprises the first one-way valve, the second one-way valve and master control oil circuit, the oil outlet of described the first one-way valve and the second one-way valve is all connected to described master control oil circuit, the filler opening of described the first one-way valve connects the first pilot control chamber of described the first pilot control hydraulic fluid port or described main reversing valve, the filler opening of described the second one-way valve connects the second pilot control chamber of described the second pilot control hydraulic fluid port or described main reversing valve, described master control oil circuit is communicated with in each work connection of described multi-way valve.
6. multi-way valve according to claim 4, it is characterized in that, described pilot control pressure selection structure comprises the first shuttle valve, the second shuttle valve and master control oil circuit, two filler openings of described the first shuttle valve communicate with described the first pilot control hydraulic fluid port and the second pilot control hydraulic fluid port respectively, the oil outlet of the first shuttle valve in the oil outlet of described the first shuttle valve and adjacent work connection communicates with two filler openings of described the second shuttle valve respectively, the oil outlet of described the second shuttle valve is connected to described master control oil circuit, described master control oil circuit is communicated with in each work connection of described multi-way valve.
7. multi-way valve according to claim 3, is characterized in that, described the first selector valve, under power failure state, is connected the oil circuit of described the first pilot control hydraulic fluid port to the first pilot control chamber of described main reversing valve; Described the first selector valve is obtaining under electricity condition, disconnect the oil circuit of described the first pilot control hydraulic fluid port to the first pilot control chamber of described main reversing valve, and connect the first pilot control chamber of described main reversing valve to the oil circuit of the oil return circuit of work connection corresponding to described guide oil way switch control structure; Described the second selector valve, under power failure state, is connected the oil circuit of described the second pilot control hydraulic fluid port to the second pilot control chamber of described main reversing valve; Described the second selector valve is obtaining under electricity condition, disconnect the oil circuit of described the second pilot control hydraulic fluid port to the second pilot control chamber of described main reversing valve, and connect the second pilot control chamber of described main reversing valve to the oil circuit of the oil return circuit of work connection corresponding to described guide oil way switch control structure.
8. multi-way valve according to claim 7, it is characterized in that, described pilot control pressure selection structure comprises the first one-way valve, the second one-way valve and master control oil circuit, the oil outlet of described the first one-way valve and the second one-way valve is all connected to described master control oil circuit, the filler opening of described the first one-way valve connects the first pilot control chamber of described the first pilot control hydraulic fluid port or described main reversing valve, the filler opening of described the second one-way valve connects the second pilot control chamber of described the second pilot control hydraulic fluid port or described main reversing valve, described master control oil circuit is communicated with in each work connection of described multi-way valve.
9. multi-way valve according to claim 7, it is characterized in that, described pilot control pressure selection structure comprises the first one-way valve, the first shuttle valve and master control oil circuit, the oil outlet of described the first one-way valve is connected to described master control oil circuit, the filler opening of described the first one-way valve communicates with the oil outlet of described the first shuttle valve, two filler openings of described the first shuttle valve communicate with described the first pilot control hydraulic fluid port and the second pilot control hydraulic fluid port respectively, and described master control oil circuit is communicated with in each work connection of described multi-way valve.
10. multi-way valve according to claim 7, it is characterized in that, described pilot control pressure selection structure comprises the first shuttle valve, the second shuttle valve and master control oil circuit, two filler openings of described the first shuttle valve communicate with described the first pilot control hydraulic fluid port and the second pilot control hydraulic fluid port respectively, the oil outlet of the first shuttle valve in the oil outlet of described the first shuttle valve and adjacent work connection communicates with two filler openings of described the second shuttle valve respectively, the oil outlet of described the second shuttle valve is connected to described master control oil circuit, described master control oil circuit is communicated with in each work connection of described multi-way valve.
11. according to the multi-way valve described in claim 5 or 6 or 8 or 9 or 10, it is characterized in that, described guide's pressure relief comprises damping and guide's draining oil circuit, described guide's draining oil circuit is communicated with in each work connection of described multi-way valve, and being external to fuel tank, the two ends of described damping connect respectively described master control oil circuit and guide's draining oil circuit.
12. multi-way valve according to claim 11, is characterized in that, on the oil circuit between described damping and described master control oil circuit, are also provided with filtrating equipment.
13. according to the multi-way valve described in claim 5 or 6 or 8 or 9 or 10, it is characterized in that, also comprise the 3rd shuttle valve, in described multi-way valve, being divided into two groups of work by different main pump fuel feeding joins, two filler openings of described the 3rd shuttle valve are connected from two groups of each self-corresponding master control oil circuits of the connection of the work by different main pump fuel feeding respectively, and filter out maximum pilot control pressure signal from the oil outlet of described the 3rd shuttle valve.
14. 1 kinds of hydraulic control systems, comprise at least one main pump, and described main pump has variable control mechanism, also comprise pilot pressure oil supply module, it is characterized in that, also comprise multi-way valve described in claim 1～13 any one, described multi-way valve is connected with described main pump and pilot pressure oil supply module respectively.
15. hydraulic control systems according to claim 14, it is characterized in that, comprise two main pumps, respectively two groups of work connection in described multi-way valve are carried out to fuel feeding, described two main pumps adopt respectively independently variable control mechanism, and described two groups of work join master control oil circuit separately and be connected respectively to the variable control mechanism of each self-corresponding main pump.
16. hydraulic control systems according to claim 14, it is characterized in that, comprise two main pumps, respectively two groups of work connection in described multi-way valve are carried out to fuel feeding, described two main pumps adopt same variable control mechanism, and described same variable control mechanism receives described two groups of work and joins the maximum pilot control pressure signal that master control oil circuit separately filters out jointly.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105422530A (en) * | 2014-10-30 | 2016-03-23 | 徐州重型机械有限公司 | Pilot integrated multi-way valve group and crane |
| CN105650048A (en) * | 2016-03-04 | 2016-06-08 | 柳州柳工液压件有限公司 | Pilot control valve group |
| CN106382271A (en) * | 2016-10-18 | 2017-02-08 | 浙江大学 | Dual-valve-element programmable control hydraulic valve piloted by high-speed switching valves and control method of dual-valve-element programmable control hydraulic valve |
| CN107654427A (en) * | 2017-09-07 | 2018-02-02 | 浙江志高机械股份有限公司 | More dynamic Control borer systems |
| CN107654427B (en) * | 2017-09-07 | 2024-05-03 | 浙江志高机械股份有限公司 | Multi-power control drilling machine system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08158411A (en) * | 1994-12-07 | 1996-06-18 | Shin Caterpillar Mitsubishi Ltd | Hydraulic circuit |
| CN101229902A (en) * | 2008-02-19 | 2008-07-30 | 湖南三一起重机械有限公司 | Hydraulic oil distribution controlling device for crane hydraulic system |
| CN201486949U (en) * | 2009-08-07 | 2010-05-26 | 伊顿液压系统(济宁)有限公司 | Logic control integrated valve block for hydraulic power steering gear |
| CN103062144A (en) * | 2012-12-30 | 2013-04-24 | 徐工集团工程机械股份有限公司江苏徐州工程机械研究院 | Load sensitive multi-way valve with anti-saturation function |
| CN203114764U (en) * | 2012-12-27 | 2013-08-07 | 徐工集团工程机械股份有限公司江苏徐州工程机械研究院 | Load-sensitive electro-hydraulic proportional multi-way valve |
| CN203868013U (en) * | 2014-01-29 | 2014-10-08 | 徐工集团工程机械股份有限公司 | Multi-tandem valve and hydraulic control system |
-
2014
- 2014-01-29 CN CN201410042838.7A patent/CN103758808B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08158411A (en) * | 1994-12-07 | 1996-06-18 | Shin Caterpillar Mitsubishi Ltd | Hydraulic circuit |
| CN101229902A (en) * | 2008-02-19 | 2008-07-30 | 湖南三一起重机械有限公司 | Hydraulic oil distribution controlling device for crane hydraulic system |
| CN201486949U (en) * | 2009-08-07 | 2010-05-26 | 伊顿液压系统(济宁)有限公司 | Logic control integrated valve block for hydraulic power steering gear |
| CN203114764U (en) * | 2012-12-27 | 2013-08-07 | 徐工集团工程机械股份有限公司江苏徐州工程机械研究院 | Load-sensitive electro-hydraulic proportional multi-way valve |
| CN103062144A (en) * | 2012-12-30 | 2013-04-24 | 徐工集团工程机械股份有限公司江苏徐州工程机械研究院 | Load sensitive multi-way valve with anti-saturation function |
| CN203868013U (en) * | 2014-01-29 | 2014-10-08 | 徐工集团工程机械股份有限公司 | Multi-tandem valve and hydraulic control system |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105422530A (en) * | 2014-10-30 | 2016-03-23 | 徐州重型机械有限公司 | Pilot integrated multi-way valve group and crane |
| CN105650048A (en) * | 2016-03-04 | 2016-06-08 | 柳州柳工液压件有限公司 | Pilot control valve group |
| CN106382271A (en) * | 2016-10-18 | 2017-02-08 | 浙江大学 | Dual-valve-element programmable control hydraulic valve piloted by high-speed switching valves and control method of dual-valve-element programmable control hydraulic valve |
| CN106382271B (en) * | 2016-10-18 | 2017-12-26 | 浙江大学 | The double spool PLC technology hydraulic valve and its method of a kind of high-speed switch valve pilot control |
| CN107654427A (en) * | 2017-09-07 | 2018-02-02 | 浙江志高机械股份有限公司 | More dynamic Control borer systems |
| CN107654427B (en) * | 2017-09-07 | 2024-05-03 | 浙江志高机械股份有限公司 | Multi-power control drilling machine system |
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