CN103758808B - Multi-way valve and hydraulic control system - Google Patents
Multi-way valve and hydraulic control system Download PDFInfo
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- CN103758808B CN103758808B CN201410042838.7A CN201410042838A CN103758808B CN 103758808 B CN103758808 B CN 103758808B CN 201410042838 A CN201410042838 A CN 201410042838A CN 103758808 B CN103758808 B CN 103758808B
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Abstract
The present invention relates to a kind of multi-way valve and hydraulic control system, the combining form that multi-way valve adopts multiple work to join, main reversing valve and corresponding guide oil way switch control structure is provided with in some work connection, guide oil way switch control structure for control pilot control hydraulic fluid port and main reversing valve pilot control chamber between the break-make of pilot pressure oil, realize work or the off-load of work connection corresponding to main reversing valve.The present invention, compared to existing hydraulic control system, can not only realize independently action restriction, and arranges special integrated valve block to the main reversing valve of each work connection to carry out pilot pressure oil and control, therefore structurally or all more simple on connecting pipeline.
Description
Technical field
The present invention relates to engineering machinery field, particularly relate to a kind of multi-way valve and hydraulic control system.
Background technique
Hoist, as a kind of Special Hoisting Equipment, needs to realize following action usually: the suspension hook that rises and falls (hereinafter referred to as: hoist), the jib that rises and falls (hereinafter referred to as luffing), revolution, the operation such as walking.Due to crane arm support limited height, suspension hook hoists and too highly can damage jib, and it is too low that suspension hook falls, and may cause the wire rope residue number of turns on elevator very little, and then the accident causing wire rope and elevator to depart from; 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 that a special limiter of moment control system (hereinafter referred to as: power limit device) monitors hoist usually; then shield corresponding operating when reaching above-mentioned ultimate state, thus reach the object of safety operation.
For automatical control system, only device need be limit directly to limit the controller output signal of corresponding operating by power, and for hydraulic control system, operator need operated pilot handle, the pilot control pressure signal being output into ratio change by pilot handle drives multi-way valve correspondence work connection to commutate, and then controls corresponding actions.In order to exert all one's strength, limit device can work in hydraulic control system, and usual way is between pilot handle and multi-way valve, arrange logic control valve.As shown in Figure 1, for the logic control device that existing a kind of height is integrated, 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 two solenoid directional control valves simultaneously, power limit device control these two solenoid valves dead electricity can realize corresponding action restriction.But the valve block of this logic control device is complicated, connecting pipeline is complicated, not easily investigates when inner member breaks down; And a certain action is by limited time, the action identical with its moment direction also can be limited, and such as hook up by limited time, luffing falls also can attonity.
On market, widely used another kind of control mode is then employing integrated valve block, and valve block arranges a solenoid valve for each action.Each road pressure of pilot handle, first through valve block, is connected to the pilot control chamber of multi-way valve, by power limit device control each solenoid valve obtain dead electricity realize action restriction.Its advantage is that each action restriction is mutually independent, and shortcoming is the control in order to realize pump, needs to connect a complicated shuttle valve group valve block for filtering out maximum pilot control pressure at guide oil Lu Shangzai, 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 action restriction, 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 that multiple work joins, main reversing valve and corresponding guide oil way switch control structure is provided with in some work connection, described guide oil way switch control structure for control pilot control hydraulic fluid port and described main reversing valve pilot control chamber between the break-make of pilot pressure oil, realize work or the off-load of work connection corresponding to described main reversing valve.
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 pilot control pressure signal maximum in each work connection in described multi-way valve, when described guide's pressure relief is used for oily without pilot pressure in the pilot control chamber of described main reversing valve, off-load is carried out to the pilot pressure oil in described pilot control pressure selection structure.
Further, described guide oil way switch control structure comprises the first selector valve and the second selector valve, the signal output part of device is limit to be connected with the power of outside, described 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 on the oil circuit in the first pilot control chamber of described main reversing valve, described 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 on the oil circuit in the second pilot control chamber of described main reversing valve, described first selector valve and the second selector valve are also connected the oil return circuit of work connection corresponding to described guide oil way switch control structure respectively, input or the off-load of the pilot pressure oil in the first pilot control chamber of described main reversing valve is controlled by switching described first selector valve, input or the off-load of the pilot pressure oil in the second pilot control chamber of described main reversing valve is controlled by switching described second selector valve.
Further, described first selector valve, obtaining under electricity condition, connects the oil circuit of described first pilot control hydraulic fluid port to the first pilot control chamber of described main reversing valve; Described first selector valve is under power failure state, disconnect the oil circuit of described first pilot control hydraulic fluid port to the first pilot control chamber of described main reversing valve, and the first pilot control chamber connecting described main reversing valve is to the oil circuit of the oil return circuit of work connection corresponding to described guide oil way switch control structure; Described second selector valve, obtaining under electricity condition, connects the oil circuit of described second pilot control hydraulic fluid port to the second pilot control chamber of described main reversing valve; Described second selector valve is under power failure state, disconnect the oil circuit of described second pilot control hydraulic fluid port to the second pilot control chamber of described main reversing valve, and the second pilot control chamber connecting described main reversing valve is 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 first one-way valve and the second one-way valve is all connected to described master control oil circuit, the filler opening of described first one-way valve connects the first pilot control chamber of described first pilot control hydraulic fluid port or described main reversing valve, the filler opening of described second one-way valve connects the second pilot control chamber of described 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 first shuttle valve communicate with described first pilot control hydraulic fluid port and the second pilot control hydraulic fluid port respectively, the oil outlet of the first shuttle valve during the oil outlet of described first shuttle valve and operated adjacent join communicates with two filler openings of described second shuttle valve respectively, the oil outlet of described 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 first selector valve, under power failure state, connects the oil circuit of described first pilot control hydraulic fluid port to the first pilot control chamber of described main reversing valve; Described first selector valve is obtaining under electricity condition, disconnect the oil circuit of described first pilot control hydraulic fluid port to the first pilot control chamber of described main reversing valve, and the first pilot control chamber connecting described main reversing valve is to the oil circuit of the oil return circuit of work connection corresponding to described guide oil way switch control structure; Described second selector valve, under power failure state, connects the oil circuit of described second pilot control hydraulic fluid port to the second pilot control chamber of described main reversing valve; Described second selector valve is obtaining under electricity condition, disconnect the oil circuit of described second pilot control hydraulic fluid port to the second pilot control chamber of described main reversing valve, and the second pilot control chamber connecting described main reversing valve is 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 first one-way valve and the second one-way valve is all connected to described master control oil circuit, the filler opening of described first one-way valve connects the first pilot control chamber of described first pilot control hydraulic fluid port or described main reversing valve, the filler opening of described second one-way valve connects the second pilot control chamber of described 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 first one-way valve is connected to described master control oil circuit, the filler opening of described first one-way valve communicates with the oil outlet of described first shuttle valve, two filler openings of described first shuttle valve communicate with described 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 first shuttle valve communicate with described first pilot control hydraulic fluid port and the second pilot control hydraulic fluid port respectively, the oil outlet of the first shuttle valve during the oil outlet of described first shuttle valve and operated adjacent join communicates with two filler openings of described second shuttle valve respectively, the oil outlet of described 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 described master control oil circuit and guide's draining oil circuit respectively.
Further, the oil circuit between described damping and described master control oil circuit is also provided with filtrating equipment.
Further, also comprise the 3rd shuttle valve, two groups are divided into be joined by the work of different main pump fuel feeding in described multi-way valve, two filler openings of described 3rd shuttle valve join each self-corresponding master control oil circuit from two groups by the work of different main pump fuel feeding respectively and are connected, and filter out maximum pilot control pressure signal from the oil outlet of described 3rd shuttle valve.
For achieving the above object, present invention also offers 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, carry out fuel feeding to group work connection of two in described multi-way valve respectively, described two main pumps adopt independently variable control mechanism respectively, and described two groups of work join the variable control mechanism that respective master control oil circuit is connected respectively to each self-corresponding main pump.
Further, comprise two main pumps, respectively fuel feeding is carried out to group work connection of two in described multi-way valve, described two main pumps adopt same variable control mechanism, and the described two groups of work of described same variable control mechanism reception join the maximum pilot control pressure signal that respective master control oil circuit 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 can carry out independently action control to realized each action by pilot handle, and then coordinate force limit device realize independently action restriction; The present invention, compared to existing hydraulic control system, can not only realize independently action restriction, and arranges special integrated valve block to the main reversing valve of each work connection to carry 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, and form a application's part, schematic description and description of the present invention, 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 the hydraulic principle schematic diagram of an embodiment of hydraulic control system of the present invention.
Fig. 3 is the hydraulic principle schematic diagram of another embodiment of hydraulic control system of the present invention.
Fig. 4-10 is the hydraulic principle schematic diagram of some work connection in several embodiments of 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's draining oil circuit; X1, x1 ', x2-master control oil circuit; X-maximum pilot control pressure signal; A1, a2-first pilot control hydraulic fluid port; B1, b2-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 '-first selector valve; 6b, 6b '-second selector valve; 7a, 7a '-first one-way valve; 7b, 7b '-second one-way valve; 8a, 8a '-first pilot control chamber; 8b, 8b '-second pilot control chamber; 9,9 '-main reversing valve; 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 the multiple work connection such as shown in Fig. 2 and Fig. 3.In figs. 2 and 3, multi-way valve V is made up 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, and work connection V4, between two groups of work connection V2-V3 and V5-V6, can be referred to as middle connection.In work connection V2-V3, V5-V6, be wherein provided with the guide oil way switch control structure of main reversing valve and correspondence all separately, Fig. 2 and Fig. 3 all depicts the hydraulic principle structure of corresponding main reversing valve 9 and 9 ' for connection V2 and V6 that work, the internal hydraulic pressure theory structure joined due to each work relatively, because omitted herein the drafting of the internal hydraulic pressure theory structure of some work connection.Certainly, also allow other work to join and be different from the internal hydraulic pressure theory structure illustrated in figure, also thought of the present invention can be applied in the multi-way valve of single main pump fuel feeding, or less work connection or more multiplex (MUX) make the multi-way valve that joins.
In figs. 2 and 3, for the connection V2 that works, guide oil way switch control structure, for controlling the first pilot control hydraulic fluid port a1, the second pilot control hydraulic fluid port b1 respectively and the break-make of the pilot pressure oil between pilot control chamber 8a, 8b of main reversing valve 9, realizes work or the off-load of the work connection of main reversing valve 9 correspondence.
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 pilot control pressure signal maximum in each work connection in multi-way valve V, guide's pressure relief then for time oily without pilot pressure in the pilot control chamber of main reversing valve, carries out off-load to the pilot pressure oil in pilot control pressure selection structure.The specific implementation of pilot control pressure selection structure and guide's pressure relief will illustrate later by reference to the accompanying drawings one by one, wouldn't describe in detail herein.
In the multi-way valve shown in Fig. 2 and Fig. 3, for the connection V2 that works, guide oil way switch control structure comprises the first selector valve 6a and the second selector valve 6b, first selector valve 6a and the second selector valve 6b all limit the signal output part of device (not shown) to be connected with outside power, and signal device can being limit to export according to power switches.First selector valve 6a is located on the oil circuit of the first pilot control hydraulic fluid port a1 to the first pilot control chamber 8a of main reversing valve 9 of work connection V2, second selector valve 6b is located on the oil circuit of the second pilot control hydraulic fluid port b1 to the second pilot control chamber 8b of main reversing valve 9 of work connection V2, first selector valve 6a and the second selector valve 6b are also connected the oil return circuit L of work connection V2 respectively, input or the off-load of the pilot pressure oil in the first pilot control chamber 8a of main reversing valve 9 is controlled by switching the first selector valve 6a, input or the off-load of the pilot pressure oil in the second pilot control chamber 8b of main reversing valve 9 is controlled by switching the second selector valve 6b.
By the design of above-mentioned guide oil way switch control structure, make the pilot pressure oil from the pilot pressure oil supply module of multi-way valve outside directly can be fed to the first pilot control chamber and the second pilot control chamber of main reversing valve by the first selector valve and the second selector valve, user can control the stroke of the spool of main reversing valve by handling pilot handle, and extreme working position can feed back on the first selector valve and the second selector valve by power limit device, to control pilot pressure oil supplying timely, and then often kind of right action limits to exert all one's strength limit device.Structurally, do not need to arrange special logic control valve, control made by the first selector valve that power limit device can directly join each work and the second selector valve, and pilot pressure oil directly can enter into work connection, need not through the integrated valve block of integrated magnet valves, therefore structure be connected on oil circuit that all comparatively existing structure is more simple, thus convenient processing installation and maintenance misarrangement.
For work connection, the guide oil way switch control structure of its inside can have multiple way of realization, the guide oil way switch control structure such as, worked in Fig. 2, Fig. 3 in connection V2, 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 oil circuit of the first pilot control chamber 8a to the oil return circuit L of work connection V2 of main reversing valve 9.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 oil circuit of the second pilot control chamber 8b to the oil return circuit L of work connection V2 of main reversing valve 9.
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 figs. 4 and 7, the first one-way valve 7a and the filler opening of the second one-way valve 7b are connected the first pilot control hydraulic fluid port a1 and the second pilot control hydraulic fluid port b1 respectively.Like this, when the first selector valve 6a is 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 be in electricity condition time, 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 first one-way valve 7a and the filler opening of the second one-way valve 7b also can be the first pilot control chamber 8a and the second pilot control chamber 8b that are connected main reversing valve 9 respectively.Like this, when the first selector valve 6a is in power failure state, the pilot pressure oil of the first pilot control hydraulic fluid port a1 does not enter into master control oil circuit x1 by the first one-way valve 7a, and when the first selector valve 6a be in electricity condition time, 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 obtaining power failure state of above-mentioned 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 oil circuit of the first pilot control chamber 8a to the oil return circuit L of work connection V2 of main reversing valve 9.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 oil circuit of the second pilot control chamber 8b to the oil return circuit L of work connection V2 of main reversing valve 9.
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 first one-way valve 7a and the filler opening of the second one-way valve 7b are connected the first pilot control hydraulic fluid port a1 and the second pilot control hydraulic fluid port b1 respectively.Like this, when the first selector valve 6a is 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 be in electricity condition time, enter into master control oil circuit x1 by the first one-way valve 7a.
As shown in Figure 8, the first one-way valve 7a and the filler opening of the second one-way valve 7b also can be connected the first pilot control hydraulic fluid port a1 and the second pilot control chamber 8b respectively.In other embodiments, also can be the first pilot control chamber 8a and the second pilot control chamber 8b connecting main reversing valve 9 respectively.
Except above-mentioned described several pilot control pressure selection structures, shuttle valve or shuttle valve network can also be set at guide's pilot pressure choice structure, such as in fig .9, pilot control pressure selection structure comprises the first one-way valve 7a, 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.First shuttle valve 11 can play larger pilot control pressure signal in the pilot pressure oil supplied by the first pilot control hydraulic fluid port a1 and the second pilot control hydraulic fluid port b1 and be linked in master control oil circuit x1.
And in Fig. 10, two adjacent work connection all have employed close shuttle valve network, and eliminate the setting of one-way valve, wherein the pilot control pressure selection structure of left side work connection comprises the first shuttle valve 11, 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 ' during the oil outlet of the first shuttle valve 11 and operated adjacent join (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 oil outlet of the first shuttle valve 11 ' and right side operated adjacent join two filler openings that the pilot pressure oil content filtered out does not receive the second shuttle valve 12 '.Just maximum pilot control pressure signal can be filtered out by the pilot pressure oil of each pilot control hydraulic fluid port in multiple work connection by such structure.
The shuttle valve network be similar in Figure 10 also can be suitable for following situation: the first selector valve, 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; 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 the first pilot control chamber connecting main reversing valve is to the oil circuit of the oil return circuit of work connection corresponding to guide oil way switch control structure; Second selector valve, 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; 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 the second pilot control chamber connecting main reversing valve is 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, when being used for oily without pilot pressure in the pilot control chamber of main reversing valve, off-load is carried out to the pilot pressure oil in pilot control pressure selection structure.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, in the work connection V1 that damping 4,4 ' can be separately positioned on multi-way valve V and work connection V7.The two ends of damping 4 connect master control oil circuit x1 and guide's draining oil circuit L respectively, and the two ends of damping 4 ' connect master control oil circuit x2 and guide's draining oil circuit L respectively.
For the guide's pressure relief worked in connection V1, when power limit device receives the signal that limit switch sends, can output signal to the first selector valve 6a of guide oil way switch control structure in relevant work connection (such as work connection V2), it is made to 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 the 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 then 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 zero rapidly under the change 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 comparatively large, the pilot control pressure signal of the master control oil circuit x1 under working state therefore can't be had influence on.In order to avoid the contaminated thing blocking of damping 4, further filtrating equipment 3 can also be set between damping 4 and master control oil circuit x1, 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 to be joined by the work of different main pump fuel feeding, then the 3rd shuttle valve 10 can be set at centre connection, two filler openings of the 3rd shuttle valve 10 join each self-corresponding master control oil circuit x1 with x2 from two groups by the work of different main pump fuel feeding respectively and are connected, 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 such as hoist.In these hydraulic control systems, at least one main pump can be comprised, and main pump has variable control mechanism, also comprise the embodiment of pilot pressure oil supply module and any one multi-way valve described above, multi-way valve is connected with main pump and pilot pressure oil supply module respectively.
All illustrate the hydraulic control system of two main pumps in Fig. 2 and Fig. 3, the hydraulic control system of in fact single main pump can adopt multi-way valve of the present invention too, and concrete structure with reference to figure 2, just no longer can detail here.In hydraulic control system shown in Fig. 2, main pump 1 and 1 ' carries out fuel feeding to group work connection of two in multi-way valve V respectively by oil inlet P 1 and P2, main pump 1 and 1 ' adopts independently variable control mechanism respectively, and two groups of work joins the variable control mechanism 2 and 2 ' that respective master control oil circuit x1 and x2 is connected respectively to 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 this variable control mechanism 2 receives two groups of work joins the maximum pilot control pressure signal X that respective master control oil circuit filters out jointly, and by this SC sigmal control variable control mechanism 2, thus 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 be controlled by other external forms, master control oil circuit without the need to multi-way valve provides pilot control pressure signal, in this case, the multi-way valve that pilot control pressure selection structure is not set can be adopted.
Illustratively its working procedure realized is carried out below for the hydraulic system shown in Fig. 2, this hydraulic system is the hydraulic system of hoist, wherein action actuating mechanism is motor 5 and 5 ' in this example, and two of multi-way valve V groups of work connection are respectively by main pump 1 and 1 ' fuel feeding, and respectively variable control mechanism 2 and 2 ' is controlled respectively by master control oil circuit x1 and x2.When describing working procedure, consider that the internal structure of work connection V2 and V6 in Fig. 2 is similar to, be therefore only described the working procedure of work connection V2 at this, 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 is all without pilot control pressure, first pilot control chamber 8a and the second pilot control chamber 8b of main reversing valve 9 communicate with guide's draining oil circuit L respectively by the first selector valve 6a and the second selector valve 6b, are in pressure release state.The spool of main reversing valve 9 is in meta, and the pressure oil that main pump 1 exports is by oil inlet P 1 successively through each work connection, and getting back to fuel tank T by oil return T1, now main pump 1 is in pressure release state.
2, working state: suppose that motor 5 controls to hoist elevator, then need to carry out hooking up operation, now driver manually makes the first selector valve 6a obtain electric, and the first selector valve 6a is switched to left position, and 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 promoting main reversing valve 9 moves down; Another road pressure signal then logical 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 change of master control pressure x1 of main pump 1.
The pressure oil that main pump 1 exports 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 hooking up operation.When operating the multiple action controlled by main pump 1, owing to being provided with the one-way valve of pilot control pressure selection oil circuit in each work connection, only have maximum pilot control pressure signal can enter into total pilot control oil circuit x1 in each work connection, therefore main pump 1 is all the time according to maximum pilot control pressure signal output flow, thus meets the traffic demand of each multi-way valve.
3, pressure release state: when motor 5 drives the elevator that hoists to rotate always, until lifting hook rises to rise to will trigger height limit switch close to during maximum lifting height, after power limit device receives the signal that limit switch sends, exporting control signal makes control hoist the first selector valve 6a dead electricity of action, first selector valve 6a gets back to right position under spring force, the passage of the first pilot control chamber 8a and the first pilot control hydraulic fluid port a1 disconnects, with the channel connection of guide's draining oil circuit L, pressure signal pressure release in first pilot control chamber 8a, main reversing valve 9 under spring force on be moved back into interposition.Main pump 1 pressure oil output no longer enters motor 5, and motor 5 stops the rotation, thus lifting hook stop motion, reach the object of safe spacing.Pressure signal in master control oil circuit x1 to be then communicated with guide's draining oil circuit L by the damping 4 in work connection V1 and to realize pressure release, and the flow of main pump 1 also reduces to zero rapidly thereupon, realizes main pump pressure release.
The control principle of the working procedure of other actions of multi-way valve and the work connection corresponding to another main pump is identical with above or close, does not repeat them here.
By the description of the structure of above-described embodiment, principle and working procedure, be appreciated that the present invention is compared with prior art, at least one of has the following advantages:
1, guide oil way switch control structure enables user directly carry out independently action control to realized each action by pilot handle, and then coordinate force limit device realizes independently action restriction.
2, by pilot control pressure signal maximum in each work of pilot control pressure selection Structure Selection connection, the oil pump Variable Control of each work connection of multi-way valve is realized.
3, the elements diverge of pilot control pressure selection structure is arranged in the some work connection of multi-way valve, and be compared to the scheme in the past adopting logical valve block, oil circuit is more clear, more easily judges when breaking down, and the maintainability of system improves.
4, pilot handle can be realized in hydraulic control system and be connected directly to multi-way valve, middle without the need to arranging complicated logical valve or solenoid valve integrated valve block and shuttle valve group valve block.Therefore, pilot line obtains simplification to a great extent, and make car load pipe-line layout more succinct, service clearance is larger, and cost is lower.
5, multi-way valve has maximum pilot control pressure selection function, can pick up this pressure very easily and control pump.In double pump system, both can pick up the maximum pilot control pressure of each single pump, and also can pick up total maximum pilot control pressure, the control overflow of the variable displacement pump of different control form can be adapted to.
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 with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or carry out equivalent replacement to portion of techniques feature; 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 of the present invention protection.
Claims (15)
1. a multi-way valve, it is characterized in that, adopt the combining form that multiple work joins, main reversing valve and corresponding guide oil way switch control structure is provided with in some work connection, described guide oil way switch control structure comprises the first selector valve and the second selector valve, make pilot pressure oil directly can be fed to the first pilot control chamber and the second pilot control chamber of main reversing valve by described first selector valve and described second selector valve, described guide oil way switch control structure is for controlling the break-make of the pilot pressure oil between the first pilot control chamber of pilot control hydraulic fluid port and described main reversing valve and the second pilot control chamber, realize work or the off-load of work connection corresponding to described main reversing valve,
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 pilot control pressure signal maximum in each work connection in described multi-way valve, when described guide's pressure relief is used for oily without pilot pressure in the pilot control chamber of described main reversing valve, off-load is carried out to the pilot pressure oil in described pilot control pressure selection structure.
2. multi-way valve according to claim 1, it is characterized in that, described first selector valve limits the signal output part of device to be connected with described second selector valve with outside power, described 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 on the oil circuit in the first pilot control chamber of described main reversing valve, described 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 on the oil circuit in the second pilot control chamber of described main reversing valve, described first selector valve and the second selector valve are also connected the oil return circuit of work connection corresponding to described guide oil way switch control structure respectively, input or the off-load of the pilot pressure oil in the first pilot control chamber of described main reversing valve is controlled by switching described first selector valve, input or the off-load of the pilot pressure oil in the second pilot control chamber of described main reversing valve is controlled by switching described second selector valve.
3. multi-way valve according to claim 2, is characterized in that, described first selector valve, obtaining under electricity condition, connects the oil circuit of described first pilot control hydraulic fluid port to the first pilot control chamber of described main reversing valve; Described first selector valve is under power failure state, disconnect the oil circuit of described first pilot control hydraulic fluid port to the first pilot control chamber of described main reversing valve, and the first pilot control chamber connecting described main reversing valve is to the oil circuit of the oil return circuit of work connection corresponding to described guide oil way switch control structure; Described second selector valve, obtaining under electricity condition, connects the oil circuit of described second pilot control hydraulic fluid port to the second pilot control chamber of described main reversing valve; Described second selector valve is under power failure state, disconnect the oil circuit of described second pilot control hydraulic fluid port to the second pilot control chamber of described main reversing valve, and the second pilot control chamber connecting described main reversing valve is to the oil circuit of the oil return circuit of work connection corresponding to described guide oil way switch control structure.
4. multi-way valve according to claim 3, it is characterized in that, described pilot control pressure selection structure comprises the first one-way valve, second one-way valve and master control oil circuit, the oil outlet of described first one-way valve and the second one-way valve is all connected to described master control oil circuit, the filler opening of described first one-way valve connects the first pilot control chamber of described first pilot control hydraulic fluid port or described main reversing valve, the filler opening of described second one-way valve connects the second pilot control chamber of described 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.
5. multi-way valve according to claim 3, it is characterized in that, described pilot control pressure selection structure comprises the first shuttle valve, second shuttle valve and master control oil circuit, two filler openings of described first shuttle valve communicate with described first pilot control hydraulic fluid port and the second pilot control hydraulic fluid port respectively, the oil outlet of the first shuttle valve during the oil outlet of described first shuttle valve and operated adjacent join communicates with two filler openings of described second shuttle valve respectively, the oil outlet of described 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.
6. multi-way valve according to claim 2, is characterized in that, described first selector valve, under power failure state, connects the oil circuit of described first pilot control hydraulic fluid port to the first pilot control chamber of described main reversing valve; Described first selector valve is obtaining under electricity condition, disconnect the oil circuit of described first pilot control hydraulic fluid port to the first pilot control chamber of described main reversing valve, and the first pilot control chamber connecting described main reversing valve is to the oil circuit of the oil return circuit of work connection corresponding to described guide oil way switch control structure; Described second selector valve, under power failure state, connects the oil circuit of described second pilot control hydraulic fluid port to the second pilot control chamber of described main reversing valve; Described second selector valve is obtaining under electricity condition, disconnect the oil circuit of described second pilot control hydraulic fluid port to the second pilot control chamber of described main reversing valve, and the second pilot control chamber connecting described main reversing valve is to the oil circuit of the oil return circuit of work connection corresponding to described guide oil way switch control structure.
7. multi-way valve according to claim 6, it is characterized in that, described pilot control pressure selection structure comprises the first one-way valve, second one-way valve and master control oil circuit, the oil outlet of described first one-way valve and the second one-way valve is all connected to described master control oil circuit, the filler opening of described first one-way valve connects the first pilot control chamber of described first pilot control hydraulic fluid port or described main reversing valve, the filler opening of described second one-way valve connects the second pilot control chamber of described 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.
8. multi-way valve according to claim 6, 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 first one-way valve is connected to described master control oil circuit, the filler opening of described first one-way valve communicates with the oil outlet of described first shuttle valve, two filler openings of described first shuttle valve communicate with described 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.
9. multi-way valve according to claim 6, it is characterized in that, described pilot control pressure selection structure comprises the first shuttle valve, second shuttle valve and master control oil circuit, two filler openings of described first shuttle valve communicate with described first pilot control hydraulic fluid port and the second pilot control hydraulic fluid port respectively, the oil outlet of the first shuttle valve during the oil outlet of described first shuttle valve and operated adjacent join communicates with two filler openings of described second shuttle valve respectively, the oil outlet of described 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.
10. the multi-way valve according to claim 4 or 5 or 7 or 8 or 9, 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 described master control oil circuit and guide's draining oil circuit respectively.
11. multi-way valve according to claim 10, is characterized in that, the oil circuit between described damping and described master control oil circuit is also provided with filtrating equipment.
12. multi-way valve according to claim 4 or 5 or 7 or 8 or 9, it is characterized in that, also comprise the 3rd shuttle valve, two groups are divided into be joined by the work of different main pump fuel feeding in described multi-way valve, two filler openings of described 3rd shuttle valve join each self-corresponding master control oil circuit from two groups by the work of different main pump fuel feeding respectively and are connected, and filter out maximum pilot control pressure signal from the oil outlet of described 3rd shuttle valve.
13. 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 any one of claim 1 ~ 12, described multi-way valve is connected with described main pump and pilot pressure oil supply module respectively.
14. hydraulic control systems according to claim 13, it is characterized in that, comprise two main pumps, respectively fuel feeding is carried out to group work connection of two in described multi-way valve, described two main pumps adopt independently variable control mechanism respectively, and described two groups of work join the variable control mechanism that respective master control oil circuit is connected respectively to each self-corresponding main pump.
15. hydraulic control systems according to claim 13, it is characterized in that, comprise two main pumps, respectively fuel feeding is carried out to group work connection of two in described multi-way valve, described two main pumps adopt same variable control mechanism, and the described two groups of work of described same variable control mechanism reception join the maximum pilot control pressure signal that respective master control oil circuit filters out jointly.
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| CN105422530B (en) * | 2014-10-30 | 2018-01-12 | 徐州重型机械有限公司 | Guide's integrated multipath valve group and crane |
| CN105650048B (en) * | 2016-03-04 | 2018-09-18 | 柳州柳工液压件有限公司 | Pilot control valve group |
| 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 |
| 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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