CN207122456U - Hydraulic lock and load feedback hydraulic system - Google Patents

Abstract

It the utility model is related to a kind of hydraulic lock, including valve body, the first check valve, the second check valve and control piston；Pilot chamber is provided with valve body, pilot chamber is separated into left pilot chamber and right pilot chamber by control piston, and the first check valve, the entrance of the second check valve connect with left pilot chamber, right pilot chamber respectively, control the left end of piston, right-hand member to set left push rod, right push rod respectively；The first hydraulic fluid port, the second hydraulic fluid port connect with left pilot chamber, right pilot chamber respectively on valve body, and the 3rd hydraulic fluid port, the 4th hydraulic fluid port connect with the first check valve, the second one-way valved outlet respectively, and pressure outlet connects with the middle part of pilot chamber；When controlling piston to be moved to the left precalculated position, left push rod opens the first check valve, and pressure outlet connects with right pilot chamber；When controlling piston to move right to close to precalculated position, right push rod opens the second check valve, and pressure outlet connects with left pilot chamber.Realize superposing type hydraulic lock workload pressure to directly lead out, be easy to fabricate and assemble.

Description

Hydraulic lock and load feedback hydraulic system

Technical field

A kind of hydraulic control device is the utility model is related to, relates in particular to a kind of hydraulic lock, the utility model also relates to A kind of and hydraulic system using above-mentioned hydraulic lock.

Background technology

Largely employed in machinery equipment field, hydraulic systems such as modern project machinery, building machinery, transport load bearing mechanis Load sensitive system, system working pressure is with load Auto-matching, it is necessary to quote loaded work piece pressure exactly as feedback pressure Power.Existing hydraulic pressure load bearing system plays locking effect in the loop using hydraulic lock more, so that executing agency can stop at Avoid malfunctioning under external force behind optional position, be typically directly superimposed concatenation one in the inlet and outlet of executing agency Hydraulic lock, load-lock is realized, quote hydraulic lock upstream pressure and carry out pressure feedback as load pressure, its advantage is：Locking Reliably, static security is high；Its shortcoming is：The inlet and outlet oil pressure of executing agency can not be brought out, and can only increase bringing onto load in addition The functional unit of pressure feedback, complicated, element increases, and reliability reduces, cost increase.

Such as：China Patent No. CN201120015083.3, entitled " bidirectional hydraulic lock ", discloses a kind of bidirectional hydraulic Lock, including valve body and the nonreturn valve core that is arranged in valve body, hydraulic lock include two entrances and corresponding two outlets, two Separated between entrance with bidirectional ram, nonreturn valve core connecting spring is arranged in valve pocket, and nonreturn valve core is arranged on relatively with valve pocket Between the entrance answered and outlet, hexagonal spiro plug is provided with valve body, with valve body using being threadedly coupled, hexagonal spiro plug leads to hexagonal spiro plug Internal thread is crossed to be connected with valve pocket.During installation, hydraulic lock is directly superimposed on the oil inlet and outlet of executing agency, the working oil of executing agency Pressure can not be directly led out, it is necessary to increase the functional unit of bringing onto load pressure feedback before valve.

China Patent No. CN201410411715, entitled " reversal valve, load sensing multi-way valve and load-sensitive hydraulic pressure System ", a kind of load sensitive system is disclosed, the load sensitive system includes a kind of reversal valve, and the valve includes valve body and set The valve rod in body cavity is put, oil-feed port, oil return opening, load pressure feedback hole and logical hydraulic fluid port are provided with valve body；Valve rod On be provided with load pressure pickup oil duct and filtering oil duct, load pressure pickup oil duct be connected by filtering oil duct with oil return opening It is logical；Valve rod leads to when the interior intracavitary of valve body slides into the position that load pressure pickup oil duct is connected with load pressure feedback hole Hydraulic fluid port is connected with oil-feed port, load pressure pickup oil duct.The bringing onto load pressure feedback hole reversal valve knot of the load sensitive system Structure is complicated, and reliability is low, and cost is high.

It is well known that allow for quoting the operating pressure of load exactly using load-sensitive hydraulic system control system As feedback controlled pressure.Existing hydraulic lock is serially connected with the inlet and outlet of executing agency due to directly superposition so that executing agency Oil inlet and outlet pressure can not directly lead out, and by increasing the functional unit of bringing onto load pressure feedback, complicated, hydraulic pressure system Element of uniting increases, and reliability reduces, cost increase.

Utility model content

In view of the above-mentioned problems, the utility model provides a kind of hydraulic lock and load feedback hydraulic system, to solve superposing type The problem of hydraulic lock load pressure can not be directly led out.

The utility model proposes a kind of hydraulic lock, including valve body, the first check valve and control piston；Edge in the valve body Pilot chamber is horizontally arranged with, the control piston, which can be arranged in pilot chamber transverse shifting and pilot chamber is separated to form into a left side, leads Pressure chamber and right pilot chamber, the entrance of first check valve connect with left pilot chamber, control the left end of piston to be provided with and can open The left push rod of first check valve；The first hydraulic fluid port, the second hydraulic fluid port, the 3rd hydraulic fluid port, the 4th hydraulic fluid port, pressure is provided with the valve body to draw Outlet, the inner of first hydraulic fluid port, the inner of the second hydraulic fluid port connect with left pilot chamber, right pilot chamber respectively, the 3rd oil Mouthful the inner, the 4th hydraulic fluid port it is inner respectively with the exporting of first check valve, right pilot chamber connects, the pressure outlet The inner connected with the middle part of pilot chamber；When the control piston is moved to the left precalculated position, the pressure outlet Inner to be connected with right pilot chamber, the left push rod opens the first check valve；When the control piston moves right to precalculated position When, the inner of the pressure outlet connects with left pilot chamber；When the control piston is located in the middle part of pilot chamber, the control Piston blocks the inner of the pressure outlet.

As a further improvement, the main valve hole of lateral direction penetrating valve body, first check valve are provided with the valve body The left end of main valve hole is arranged on, the right-hand member of the main valve hole sets limited location to block, and main valve hole stage casing forms the pilot chamber.

As a further improvement, in addition to it is arranged at the inner second unidirectional between right pilot chamber of the 4th hydraulic fluid port Valve, the entrance of second check valve, outlet connect with right pilot chamber, the inner of the 4th hydraulic fluid port respectively, the control piston Right-hand member is provided with the right push rod that can open the second check valve；When the control piston moves right to precalculated position, the pressure The inner of power outlet connects with left pilot chamber, and the right push rod opens the second check valve.

As a further improvement, the main valve hole of lateral direction penetrating valve body is provided with the valve body, main valve hole stage casing is formed The pilot chamber, first check valve, the second check valve are separately positioned on the left end of main valve hole, right-hand member.

As a further improvement, first check valve includes the first valve being successively set on from left to right in main valve hole Blanking cover, the first spring, the first valve element, the first valve seat, one end of first spring are connected on the first valve blanking cover, and the other end supports It is connected on the first valve element so that the first valve element blocks the valve opening on the first valve seat, the left part of the left push rod and the first valve element phase It is right；And/or second check valve includes being successively set on the second valve blanking cover in main valve hole, second spring, the from right to left Two valve elements, the second valve seat, one end of the second spring are connected on the second valve blanking cover, the other end be connected on the second valve element with The second valve element is set to block the valve opening on the second valve seat, the right part of the right push rod is relative with the second valve element.

As a further improvement, in the control central axis of piston, the central axis of left push rod, the first valve element Heart line is parallel or coaxial；And/or central axis, the central axis of right push rod and the center of the second valve element of the control piston Line is parallel or coaxial.

As a further improvement, being provided between the valve body and control piston makes control piston be located in the middle part of pilot chamber Back-moving spring.

As a further improvement, first hydraulic fluid port, the second hydraulic fluid port, valve body lower section phase are set above the valve body It is corresponding that 3rd hydraulic fluid port, the 4th hydraulic fluid port, pressure outlet, the pressure outlet outer end and the 3rd hydraulic fluid port and the 4th are set The outer end of hydraulic fluid port is located in approximately the same plane sealing area；Or, set above the valve body first hydraulic fluid port, the second hydraulic fluid port, Pressure outlet, corresponding setting the 3rd hydraulic fluid port, the 4th hydraulic fluid port below the valve body, the pressure outlet outer end with The outer end of first hydraulic fluid port and the second hydraulic fluid port is located in approximately the same plane sealing area.

Hydraulic lock provided by the utility model, including valve body, the first check valve and control piston；In the valve body transversely Pilot chamber is provided with, the control piston can be arranged in pilot chamber transverse shifting and pilot chamber is separated to form into left pilot chamber With right pilot chamber, the entrance of first check valve is connected with left pilot chamber, and first can be opened by controlling the left end of piston to be provided with The left push rod of check valve；The first hydraulic fluid port, the second hydraulic fluid port, the 3rd hydraulic fluid port, the 4th hydraulic fluid port, pressure is provided with the valve body to draw Mouthful, the inner of first hydraulic fluid port, the inner of the second hydraulic fluid port connect with left pilot chamber, right pilot chamber respectively, the 3rd hydraulic fluid port The inner, the 4th hydraulic fluid port it is inner respectively with the exporting of first check valve, right pilot chamber connects, the pressure outlet The inner connects with the middle part of pilot chamber；When it is described control piston be moved to the left precalculated position when, the pressure outlet it is interior End connects with right pilot chamber, and the left push rod opens the first check valve；When the control piston moves right to precalculated position, The inner of the pressure outlet connects with left pilot chamber；When the control piston is located in the middle part of pilot chamber, the control is lived Plug blocks the inner of the pressure outlet.The utility model realizes the function of hydraulic lock using the control piston in hydraulic lock, Simultaneously control piston according between pressure at two ends size control pressure extraction oil-opening and the first hydraulic fluid port, pressure extraction oil-opening and second Break-make between hydraulic fluid port, directly leading out for workload pressure is realized, the extraction for solving existing hydraulic lock load pressure needs to increase Add related load feedback function unit, it is complicated, cost is high the problems such as.In addition, the utility model is only in existing hydraulic pressure locking-valve Body ad-hoc location increases by an oilhole, and valve body structure is simple in construction, be easy to fabricate and assemble without redesigning, and cost is low, Reliability is higher.

The utility model also provides a kind of load feedback hydraulic system, including pressure oil-source, Oil-source control module, loop control Molding block, executing agency, it is characterised in that also include the hydraulic lock such as claim any one of, the pressure oil Oil inlet, oil return opening of the pressure oil port, oil return opening in source respectively with the Oil-source control module connect, the Oil-source control module Pressure oil outlet, oil return import mouth respectively the oil inlet with circuit control module, oil return opening connect, the circuit controls mould The working oil input/output port of block, the first hydraulic fluid port with hydraulic lock, the second hydraulic fluid port connect respectively, the 3rd oil of the hydraulic lock Mouthful, the 4th hydraulic fluid port respectively the oil inlet and outlet with executing agency, connect；

The pressure outlet of the hydraulic lock is connected with the control port of executing agency, and the pressure signal of load feedback is used In the logic control with load feedback pressure correlation；

And/or the pressure outlet of the hydraulic lock is connected with the pressure testing and controlling module of system, and load pressure is supervised Survey display or feed back to control system and carry out the condition control based on load feedback；

And/or the pressure outlet of the hydraulic lock connects with the feedback pressure intake of circuit control module, base is carried out Controlled in the flow of load pressure feedback；

And/or the pressure outlet of the hydraulic lock connects with the feedback oil intake of Oil-source control module, is based on Pressure and the flow control of load pressure feedback；

And/or the pressure outlet of the hydraulic lock connects with the load feedback control mouth of pressure oil-source, while pressure is drawn Outlet connects with the feedback oil intake of Oil-source control module, carries out based on load pressure feedback or pressure and flow control.

The utility model also provides a kind of load feedback hydraulic system, including pressure oil-source, Oil-source control module, logic control Molding block, at least two executing agencies, each executing agency are correspondingly arranged on a circuit controls unit, the pressure oil-source Oil inlet, the oil return opening of pressure oil port, oil return opening respectively with the Oil-source control module connect, the pressure of the Oil-source control module Power oil outlet, oil return import oil inlet, oil return opening of the mouth respectively with each circuit controls unit and connected, it is characterised in that extremely A rare circuit controls unit includes the hydraulic lock any one of such as claim, not including described hydraulic lock The oil inlet with corresponding executing agency, the oil-out connection respectively of two working oil input/output ports of circuit controls unit, is returned The feedback oil outlet of road control unit connects with the load feedback pressure entrance of Logic control module；Including the hydraulic lock The first hydraulic fluid port with hydraulic lock, the second hydraulic fluid port connect two working oil input/output ports of circuit controls unit respectively, hydraulic lock The 3rd hydraulic fluid port, the oil inlet with corresponding executing agency, the oil-out connection respectively of the 4th hydraulic fluid port, pressure outlet and logic control The load feedback pressure entrance connection of molding block；

The load feedback pressure of each load feedback pressure entrance is compared by the Logic control module, and by maximum Load feedback pressure output is to load feedback pressure output；

The load feedback pressure output is connected with the pressure testing and controlling module of system, and display is monitored to load pressure Or feed back to control system and carry out the condition control based on load feedback；

And/or the load feedback pressure output connects with the load feedback intake of Oil-source control module, base is carried out Controlled in the pressure and flow of load feedback；

And/or load feedback pressure output connects with the load feedback control mouth of pressure oil-source, while and Oil-source control The oily intake connection of feedback of module carries out based on load pressure feedback or pressure and flow control；

And/or load feedback pressure output connects with the load feedback input port of at least one circuit controls unit, enters Flow Compliance control of the row based on load feedback.

Two above-mentioned class load feedback hydraulic systems, by using hydraulic lock provided by the utility model, you can realize base Controlled in the system of load feedback, constituent system components are few, and reliability is high, and cost is low.

Brief description of the drawings

Fig. 1 is the structural representation of the hydraulic lock in the utility model first embodiment；

Fig. 2 is the structural representation of the hydraulic lock increase back-moving spring in the utility model first embodiment；

Fig. 3 is the structural representation of the hydraulic lock in the utility model second embodiment；

Fig. 4 is the structural representation of the hydraulic lock increase back-moving spring in the utility model 3rd embodiment；

Fig. 5 is the single loop load feedback hydraulic system principle figure in the utility model one embodiment；

Fig. 6 is the multiloop load feedback hydraulic system principle figure in the utility model one embodiment.

Embodiment

In description of the present utility model, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outer ", " axial direction ", " radial direction ", etc. instruction side Position or position relationship are based on orientation shown in the drawings or position relationship, are for only for ease of description the utility model and simplification is retouched State, rather than instruction or imply signified device or element there must be specific orientation, with specific azimuth configuration and operation, Therefore it is not intended that to limitation of the present utility model.

In addition, term " first ", " second " are only used for describing purpose, and it is not intended that instruction or hint relative importance Or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can be expressed or Implicitly include one or more this feature.In description of the present utility model, " multiple " are meant that two or more, remove It is non-separately to have clearly specific limit.

In the utility model, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " Gu It is fixed " etc. term should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integrally；Can be Mechanically connect or electrically connect；Can be joined directly together, can also be indirectly connected by intermediary, can be two The connection of element internal or the interaction relationship of two elements.For the ordinary skill in the art, can basis Concrete condition understands concrete meaning of the above-mentioned term in the utility model.

In the utility model, unless otherwise clearly defined and limited, fisrt feature is "above" or "below" second feature Can be that the first and second features directly contact, or the first and second features pass through intermediary mediate contact.Moreover, first is special Sign second feature " on ", " top " and " above " can be fisrt feature directly over second feature or oblique upper, or only Represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be with Be fisrt feature immediately below second feature or obliquely downward, or be merely representative of fisrt feature level height and be less than second feature.

In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show The description of example " or " some examples " etc. means specific features, structure, material or the spy for combining the embodiment or example description Point is contained at least one embodiment or example of the present utility model.In this manual, to the schematic table of above-mentioned term State and be necessarily directed to identical embodiment or example.Moreover, specific features, structure, material or the feature of description can be with Combined in an appropriate manner in any one or more embodiments or example.In addition, in the case of not conflicting, this area Technical staff the different embodiments or example and the feature of different embodiments or example described in this specification can be entered Row combines and combination.

As depicted in figs. 1 and 2, a kind of hydraulic lock that the utility model embodiment one proposes, is one-way hydraulic lock, including valve Body 3, the first check valve 1 and control piston 2；Pilot chamber 31 is horizontally arranged with the valve body 3, the control piston 2 can be horizontal To being movably arranged in pilot chamber 31 and pilot chamber 31 be separated to form into left pilot chamber and right pilot chamber, first check valve 1 entrance connects with left pilot chamber, and the left end of control piston 2 is provided with the left push rod 21 that can open the first check valve 1；The valve The first hydraulic fluid port A, the second hydraulic fluid port B, the 3rd hydraulic fluid port A1, the 4th hydraulic fluid port B1, pressure outlet M, first hydraulic fluid port are provided with body 3 A the inner, the second hydraulic fluid port B the inner connect with left pilot chamber, right pilot chamber respectively, the inner of the 3rd hydraulic fluid port A1, the 4th Hydraulic fluid port B1 it is inner respectively with the exporting of first check valve 1, right pilot chamber connect, the inner of the pressure outlet M and The middle part connection of pilot chamber 31；When the control piston 2 is moved to the left precalculated position, it is single that the left push rod 21 opens first To valve 1, while the inner of the pressure outlet M connects with right pilot chamber；When the control piston 2 moves right to pre-determined bit When putting, the inner of the pressure outlet M connects with left pilot chamber；When the control piston 2 is located at pilot 31 middle part of chamber, institute State the inner that control piston 2 blocks the pressure outlet M.

As further preferred embodiment, the main valve hole of lateral direction penetrating valve body 3 is provided with the valve body 3, it is described First check valve 1 is arranged on the left end of main valve hole, and the right-hand member of the main valve hole sets limited location to block 15, spacing 15 pairs of controls of blocking Piston 2 processed move to right motion carry out it is spacing, main valve hole stage casing forms the pilot chamber 31.Main valve hole lateral direction penetrating valve body 3, is easy to lead Press the processing and check valve, the assembling of spacing blocking of chamber.

During the hydraulic lock work of the present embodiment, when the control piston 2 is moved to the left close to precalculated position i.e. with first Check valve it is in the closed position valve element contact when, the inner of the pressure outlet M connects with right pilot chamber, control piston after Continuous to be moved to the left, the left push rod 21 opens the first check valve 1, while the inner and right pilot chamber of the pressure outlet M is protected Connection is held, until control piston is moved to the left to extreme position, the first check valve is opened completely, now the pressure outlet M Inner still keep connecting with right pilot chamber；When it is described control piston 2 move right to close to precalculated position i.e. with spacing blocking During 15 contact, the inner of the pressure outlet M connects with left pilot chamber；When the control piston 2 is located at the middle part of pilot chamber 31 When, the control piston 2 blocks the inner of the pressure outlet M.The present embodiment utilizes the control piston in hydraulic lock to realize The function of one-way hydraulic lock, at the same control piston according between pressure at two ends size control pressure extraction oil-opening and the first hydraulic fluid port, Break-make between pressure extraction oil-opening and the second hydraulic fluid port, directly leading out for workload pressure is realized, solve superposing type hydraulic pressure The problem of lock load pressure can not be drawn.In addition, the utility model only increases an oilhole, valve body in hydraulic lock valve body ad-hoc location Structure is simple in construction, be easy to fabricate and assemble without redesigning.

As shown in Figure 3 and Figure 4, wherein, the connection between the valve seat and valve body of the check valve (the 1st class check valve) in Fig. 3 is adopted The seal isolation between one-way valve inlet and outlet is realized with interference fit, valve seat does not have guide effect to valve element, and its valve element is led Guiding cylinder on by valve body is completed, and the 1st class one-way valve seat is simple in construction, needs to be pressed during assembling, and can not repeat to tear open Dress, when valve body both ends are equipped with check valve, control piston lossless can not be split out, can not be nondestructively to unidirectional during use Valve carries out position exchange or dismounting, makes element configuration is flexible to decline.The valve seat and valve of check valve (the second class check valve) in Fig. 4 The seal isolation between one-way valve inlet and outlet is realized in connection between body by the way of soft seal.Second class check valve, can To realize lossless dismounting, the switching of confined state can be nondestructively carried out in use, and the configuration of element is flexible big.This practicality The hydraulic lock that new embodiment two provides, be bidirectional hydraulic lock, including valve body 3, the first check valve 1, the second check valve 4 and is controlled Piston 2；Pilot chamber 31 is horizontally arranged with the valve body 3, the control piston 2 can be arranged on pilot chamber 31 transverse shifting In and pilot chamber 31 is separated to form left pilot chamber and right pilot chamber, the entrance of first check valve 1, the second check valve 4 The left end with left pilot chamber, the right-hand member of right pilot chamber connect entrance respectively, control the left end of piston 2, right-hand member is set respectively to beat Drive the left push rod 21 of the first check valve 1, the right push rod 22 of the second check valve 4 can be opened；The first hydraulic fluid port is provided with the valve body 3 A, the second hydraulic fluid port B, the 3rd hydraulic fluid port A1, the 4th hydraulic fluid port B1, pressure outlet M, the inner of the first hydraulic fluid port A, the second hydraulic fluid port B The inner connect with left pilot chamber, right pilot chamber respectively, the inner of the 3rd hydraulic fluid port A1, the 4th hydraulic fluid port B1 the inner respectively with institute State outlet, the outlet of the second check valve 4 of the first check valve 1, the inner of the pressure outlet M with pilot chamber 31 Portion connects.When the control piston 2 is moved to the left close to the precalculated position valve element in the closed position i.e. with the first check valve During contact, the inner of the pressure outlet M connects with right pilot chamber, and control piston continues to be moved to the left precalculated position, institute State left push rod 21 and open the first check valve 1, while the inner and right pilot chamber of the pressure outlet M keeps connecting, until control Piston processed is moved to the left to extreme position, and the first check valve is opened completely, now the inner and right pilot of the pressure outlet M Chamber still keeps connecting；When the control piston 2 moves right in the closed position i.e. with the second check valve 4 close to precalculated position Valve element 41 contact when, the inner of the pressure outlet M connects with left pilot chamber, control piston continue to move right, it is described Right push rod 22 opens the second check valve 4, while the inner and left pilot chamber of the pressure outlet M keeps connecting, until control Piston moves right to extreme position, and the second check valve is opened completely, now the inner and left pilot chamber of the pressure outlet M Still keep connecting；When the control piston 2 is located at pilot 31 middle part of chamber, the control piston 2 blocks the pressure outlet M The inner.

The present embodiment realizes the function of bidirectional hydraulic lock using the control piston in hydraulic lock, while controls piston according to two Break-make between end pressure size control pressure extraction oil-opening and the first hydraulic fluid port, between pressure extraction oil-opening and the second hydraulic fluid port, it is real Directly leading out for existing workload pressure, solves the problems, such as that superposing type hydraulic lock load pressure can not be drawn.In addition, this practicality It is new only hydraulic lock valve body ad-hoc location increase an oilhole, valve body structure without redesign, it is simple in construction, be easy to processing make Make and assemble.

As further preferred embodiment, the main valve hole of lateral direction penetrating valve body 3, main valve are provided with the valve body 3 Hole forms the pilot chamber 31, and first check valve 1, the second check valve 4 are separately positioned on the left end of main valve hole, right-hand member.It is main Valve opening lateral direction penetrating valve body 3, it is easy to the processing of pilot chamber and the assembling of check valve.

As further preferred embodiment, first check valve 1 includes being successively set on main valve hole from left to right In the first valve blanking cover 13, the first spring 12, the first valve element 11, the first valve seat 14, the outer ring of the first valve seat 14 and main valve hole inwall It is tightly connected, the inner ring of the first valve seat 14 forms valve opening.One end of first spring 12 is connected on the first valve blanking cover 13, another End is connected on the first valve element 11 so that the first valve element 11 blocks the valve opening on the first valve seat 14, the left part of the left push rod 21 Relative with the first valve element 11, left push rod 21 can push up open the first valve element 11 when being moved to the left, and the valve opening on the first valve seat 14 is opened.Institute It is coaxial or parallel to state the control central axis of piston 2, the central axis of left push rod 21, the center line of the first valve element 11, so controls The left push rod 2 of piston 2 processed more can effortlessly push up out the first valve element 11 of the first check valve 1, be not easy hair fastener.

As further preferred embodiment, second check valve 4 includes being successively set on main valve hole from right to left In the second valve blanking cover 43, second spring 42, the second valve element 41, the second valve seat 44, the outer ring of the second valve seat 44 and main valve hole inwall It is tightly connected, the inner ring of the second valve seat 44 forms valve opening.One end of the second spring 42 is connected on the second valve blanking cover 43, another End is connected on the second valve element 41 so that the second valve element 41 blocks the valve opening on the second valve seat 44, the right part of the right push rod 22 Relative with the second valve element 41, right push rod 22 can push up open the second valve element 41 when moving right, and the valve opening on the second valve seat 44 is opened.Institute It is coaxial or parallel to state the central axis of control piston 2, the central axis of right push rod 22 and the center line of the second valve element 41, so, The right push rod 22 of control piston 2 more can effortlessly push up out the second valve element 41 of the second check valve 4, be not easy hair fastener.

As further preferred embodiment, the top of valve body 3 sets the first hydraulic fluid port A, the second hydraulic fluid port B, institute State corresponding setting the 3rd hydraulic fluid port A1 in the lower section of valve body 3, the 4th hydraulic fluid port B1, pressure outlet M, the pressure outlet (M) outer end and the outer end of the 3rd hydraulic fluid port (A1) and the 4th hydraulic fluid port (B1) are located in approximately the same plane sealing area, are easy to hydraulic lock The 3rd hydraulic fluid port (A1) and the 4th hydraulic fluid port (B1) and pressure outlet M be integrated and connected and seal with its element or part, reduce Pipeline connects, and simple in construction, compact in design, cost is low, reliability is high.The utility model only increases in hydraulic lock valve body ad-hoc location Add an oilhole i.e. pressure outlet M, valve body structure is simple in construction, be easy to fabricate and assemble without redesigning.Certainly, When pressure outlet M and the first hydraulic fluid port A, the second hydraulic fluid port B are in same plane, it is flat that pressure outlet M is distributed on valve body this In the sealing area in face.Or pressure outlet M may be alternatively located at and arbitrary orientation on the valve body of A1, A2 not in the same plane.

As further preferred embodiment, as shown in Figure 2 and Figure 4, set between the valve body 3 and control piston 2 There is the back-moving spring 16 for making control piston 2 be located at the middle part of pilot chamber 31, back-moving spring 16 can make control piston 2 return to middle position.

As shown in 5.0 in Fig. 5, the utility model also provides a kind of single loop load feedback hydraulic system, including pressure Oil sources 5, Oil-source control module 6, circuit control module 7, executing agency 9, in addition to hydraulic lock provided by the utility model 8, institute State the pressure oil port P of pressure oil-source 5, the oil inlet P 0 with the Oil-source control module 6, oil return inlet T 0 connect oil return inlet T respectively, The pressure oil outlet PC of the Oil-source control module 6, oil return import mouth TC respectively the oil inlet P 1 with circuit control module, return Hydraulic fluid port T1 is connected, working oil input/output port C1, D1 of the circuit control module 7 respectively the first hydraulic fluid port A with hydraulic lock 8, Second hydraulic fluid port B is connected, and the 3rd hydraulic fluid port A1, the 4th hydraulic fluid port B1 of hydraulic lock 8 connect with oil inlet and outlet LA, LB of executing agency 9 respectively Logical, the pressure outlet M of the hydraulic lock 8 can be with：

Connected with the control port BR of executing agency 9, the pressure signal of load feedback is used for and load feedback pressure phase The logic control of pass, executing agency's brake is such as opened, as shown in 5.1 in Fig. 5；

Connected with the pressure testing and controlling module 10 of system, display is monitored to load pressure or feeds back to control system progress Condition control based on load feedback, as shown in 5.2 in Fig. 5；

Connected with the feedback pressure intake CF1 of circuit control module 7, carry out the flow control based on load pressure feedback System, as shown in 5.3 in Fig. 5；

Connected with the feedback oil intake LS of Oil-source control module 6, carry out pressure and flow based on load pressure feedback Control, as shown in 5.4 in Fig. 5；

Connected with the load feedback control mouth X of pressure oil-source 5, at the same with the feedback oil intake LS of Oil-source control module 6 Connection, based on load pressure feedback or pressure and flow control are carried out, as shown in 5.5 in Fig. 5；

Above-mentioned negative-feedback hydraulic work system process is as follows：Pressure oil-source 5 is from P mouths pressure oil output to Oil-source control module 6 pressure oil input port P0, Oil-source control module 6 oil sources is carried out pressure and or flow control after, by controlled pressure oil from pressure Power oil outlet PC, the pressure oil-in P1 of circuit control module 7 is input to, circuit control module 7 is to from Oil-source control mould The pressure oil travel direction of block and or pressure and or flow control after, or by actuator port C1 be transported to the of hydraulic lock 8 One hydraulic fluid port A, then by the hydraulic fluid port A1 of hydraulic lock 8 the 3rd, the actuator port LA of executing agency 9 is output to, driving executing agency is by one Fixed speed positive movement, while the oil return of executing agency 9 returns to the 4th hydraulic fluid port B1 of hydraulic lock 8 by LB mouths, then through hydraulic pressure Second hydraulic fluid port B of lock 8 returns to the D1 mouths of circuit control module 7, then returns to oil sources control by the oil return inlet T 1 of circuit control module 7 The oil return of molding block 6 imports mouth TC, and the oil return inlet T of pressure oil-source is returned to finally by the oil return inlet T 0 of Oil-source control module；Or The second hydraulic fluid port B of hydraulic lock 8 is transported to by actuator port D1, then by the hydraulic fluid port B1 of hydraulic lock 8 the 4th, is output to executing agency 9 actuator port LB, driving executing agency 9 are moved by certain velocity reversal, while the oil return of executing agency 9 is returned by LA mouths To the 3rd hydraulic fluid port A1 of hydraulic lock 8, then the first hydraulic fluid port A through hydraulic lock 8 returns to the C1 mouths of circuit control module 7, then by returning The oil return that the oil return inlet T 1 of road control module 7 returns to Oil-source control module 6 imports mouth TC, finally by returning for Oil-source control module Hydraulic fluid port T0 returns to the oil return inlet T of pressure oil-source.At the same time, load pressure can be input to by the M mouths of hydraulic lock 8：

As shown in 5.1 in Fig. 5, the brake hydraulic control unblock control mouth BR of executing agency 9 is input to, is solved for executing agency Lock, during executing agency moves, the unlatching of executing agency's brake is protected by the continuous loading pressure from M mouths；

As shown in 5.2 in Fig. 5, pressure testing and controlling module 10 is input to, display is monitored to load pressure or is fed back to Control system carries out the condition control based on load feedback, realizes with real-time monitoring of the point to both direction moving loads Display or feedback；

As shown in 5.3 in Fig. 5, the feedback pressure input port CF1 of loop control module 7 is input to, with circuit control module 7 Normally opened pressure-compensated valve 71 the connection of feedback control chamber, keep it turned on pressure-compensated valve 71, while pressure-compensated valve 71 The control pressure of another control chamber and the outlet for taking from pressure-compensated valve, you can the entrance of flow regulating valve, having drives recuperation valve The effect that mouth diminishes, under conditions of the input pressure of Oil-source control module 6 oil is enough, the valve element of differential pressure compensator is taking from it Lower holding balance is acted in the control pressure and spring cavity control pressure and spring of outlet simultaneously, ensure that fluid from adjustable throttling Valve inlet is certain value to the pressure difference between the pressure point of feedback pressure, i.e., the spring of differential pressure compensator sets pressure difference, so that By the oil-feed flow of circuit control module 7, only controlled by the aperture of adjustable throttling, and with the oil supply pressure in loop and load Size is unrelated, realizes the flow control based on load feedback；

As shown in 5.4 in Fig. 5, the load feedback pressure introduction port LS of Oil-source control module 6 is input to, with Oil-source control The feedback control chamber connection of the logical valve of module 6, remains off pressure-compensated valve, while another control chamber of logical valve Control pressure take from oil supply pressure oil-in P0, there is to make logical valve to open, in the input pressure of power source 5 oil enough Under conditions of, the valve element of logical valve real-time dynamic equilibrium, ensure that oil under pressure and the power of spring force three effect of two control chambers Pressure difference between pressure point of the liquid from hydraulic oil inlet P0 to feedback pressure is certain value, i.e. the spring setting pressure difference of logical valve 62, So that by the oil-feed flow of circuit control module 7, only controlled by the aperture of adjustable throttling, and with the oil supply pressure in loop It is unrelated with load, system excess traffic, by logical valve 62, through Oil-source control module oil return inlet T 0, return to pressure oil-source Oil return inlet T；Make oil supply pressure maintain the spring of a logical valve higher than load pressure to set pressure difference all the time simultaneously, realize system The dispensing on demand of pressure；It is simultaneously from M feedback pressures oil to connect with the oil inlet of overflow valve 61, when load pressure is less than overflow valve During 61 setting value, load and worked according to the state of a control of circuit control module 7, when load pressure is higher than the setting of overflow valve 61 During value, the load feedback pressure from M mouths opens overflow valve 61, so that the spring force for acting on logical valve control chamber in the same direction Pressure is equal to the setting value of overflow valve 61, while the input pressure oil of pressure oil-source 5 is patrolled than high 1 of pressure of the setting of overflow valve 61 Perfect overflow under the pressure of the spring pressure difference of valve 62 is collected, pressure overload protection is carried out to system, realized based on load feedback Pressure and flow control；

As shown in 5.5 in Fig. 5, the load feedback pressure introduction port LS and pressure oil-source 5 of Oil-source control module 6 are input to Load sensitive pump feedback control mouth X, be input to Oil-source control module 6 LS mouths load feedback oil, be communicated to overflow valve 61 Oil inlet, maximum pressure restriction is carried out to feedback pressure, so as to realize the pressure overload protection to system；At the same time, load Pressure is incorporated into the feedback control chamber of the load-sensitive valve of load sensitive pump 51 through X, meets the output flow of load sensitive pump： Load-sensitive pump discharge P is to the load-sensitive valve that the pressure difference between the pressure point of feedback pressure is certain value, i.e. load sensitive pump Pressure differential resetting value so that by the oil-feed flow of circuit control module 7, only controlled by the aperture of adjustable throttling, and with The oil supply pressure and load in loop are unrelated, meanwhile, the valve element of the load-sensitive valve of load sensitive pump controls cavity pressure two (being taken respectively from P mouths and M mouths) and spring force, under the effect of three power, real-time dynamic equilibrium, the operating pressure of pressure oil-source is set to protect all the time Hold and set pressure difference in 1 load-sensitive valve higher than load pressure, realize matching somebody with somebody on demand for the pressure based on load feedback and flow The pressure flow hybrid control given, no spill losses, energy-conservation, efficiently.

As shown in 6.0 in Fig. 6, the utility model also provides a kind of multiloop load feedback system, including pressure oil-source 5th, Oil-source control module 6, the first circuit controls unit 201, the first executing agency 91, second servo loop control unit 202, second are held Row mechanism 92 ... ..., N circuit controls unit 20N, N executing agencies 9N, Logic control module 17, its first circuit controls Unit 201, including circuit control module 7 and hydraulic lock provided by the utility model 8；

The pressure oil port P of the pressure oil-source 5, oil return inlet T respectively the oil inlet P 0 with the Oil-source control module 6, return Hydraulic fluid port T0 is connected, the pressure oil outlet PC of the Oil-source control module 6, oil return import mouth TC respectively with circuit control module 7 Oil inlet P 1, oil return inlet T 1 connect, working oil input/output port C1, D1 of the circuit control module 7 respectively with hydraulic lock 8 The first hydraulic fluid port A, the second hydraulic fluid port B connection, the 3rd hydraulic fluid port A1, the 4th hydraulic fluid port B1 of hydraulic lock 8 respectively with the first executing agency 91 Oil inlet and outlet LA1, LB1 connection.The pressure outlet M of the hydraulic lock 8 and the load feedback pressure of Logic control module 17 Entrance F1 is connected, and/or, pressure outlet M connects with the control port BR of the first executing agency 91, by the pressure of load feedback Signal is used for the logic control with load feedback pressure correlation, such as opens the brake of the first executing agency, and/or, pressure is drawn Outlet M is connected with the circuit pressure control module 102 of system, and display is monitored to load pressure or feeds back to control system to enter Condition control of the row based on load feedback, and/or, pressure outlet M and circuit control module 7 feedback pressure intake CF1 Connection, carry out the flow control based on load pressure feedback.

The oil inlet P 2 of the second servo loop control unit 202, the oil inlet with Oil-source control module 6 respectively of oil return inlet T 2 P0, oil return inlet T 0 connect, and working oil input/output port VA2, VB2 of second servo loop control unit 202 perform machine with second respectively Oil inlet and outlet LA2, LB2 connection of structure 92, the feedback oil outlet LF2 and Logic control module of second servo loop control unit 202 17 feedback oil input port F2 connections；

……

The oil inlet P N of the N circuit controls units 20N, oil return inlet T the N oil inlet with Oil-source control module 6 respectively P0, oil return inlet T 0 connect, N circuit controls units 20N working oil input/output port VAN, VBN respectively with N executing agencies 9N oil inlet and outlet LAN, LBN connection, N circuit controls units 20N feedback oil outlet LFN and Logic control module 17 Feed back oily input port FN connections；

By first, the load feedback pressure in two ..., N loops is compared the Logic control module 17, and by maximum Load feedback pressure output is to load feedback pressure output hydraulic fluid port Fm；

The load feedback pressure output hydraulic fluid port Fm of Logic control module 17 connects with the pressure testing and controlling module 101 of system, right Load pressure, which is monitored display or feeds back to control system, carries out the condition control based on load feedback,

And/or load feedback pressure output hydraulic fluid port Fm connects with the load feedback intake LS of Oil-source control module 6, enters Pressure and flow control of the row based on load feedback；

And/or load feedback pressure output hydraulic fluid port Fm connects with the load feedback control mouth X of pressure oil-source 5, at the same with oil The oily intake LS connections of feedback of source control module 6 carry out based on load pressure feedback or pressure and flow control；

And/or the load feedback input port CB1 of load feedback pressure output hydraulic fluid port Fm and the first circuit controls unit 201 Connection, carries out the flow Compliance control based on load feedback；

And/or the load feedback pressure output hydraulic fluid port Fm and load feedback input port CB2 of second servo loop control unit 202 Connection, carries out the flow Compliance control based on load feedback；

……

And/or load feedback pressure output hydraulic fluid port Fm and N circuit controls unit 20N load feedback input port CBN connects It is logical, carry out the flow Compliance control based on load feedback；

As shown in 6.1 in Fig. 6, as further preferred embodiment, a kind of four loop load feedback hydraulic systems, Including pressure oil-source 5, Oil-source control module 6, the first circuit controls unit 201, the first executing agency 91, second servo loop control is single First 202, second executing agency 92, tertiary circuit control unit 203, the 3rd executing agency 93, the 4th circuit controls unit 204, 4th executing agency 94, Logic control module 17, its first circuit controls unit 201 include the first circuit control module 71 and this The first loop hydraulic lock 8 that utility model provides, its second servo loop control unit 202 includes second servo loop control module 72 and this The second servo loop hydraulic lock 8 that utility model provides, tertiary circuit control unit 203 include tertiary circuit control module 73, and the 4th Circuit controls unit 204 includes the 4th circuit control module 74.

The pressure oil port P of the pressure oil-source 5, oil return inlet T respectively the oil inlet P 0 with the Oil-source control module 6, return Hydraulic fluid port T0 is connected, the pressure oil outlet PC of the Oil-source control module 6, oil return import mouth TC respectively with the first circuit controls mould Oil inlet P 1, the oil return inlet T 1 of block 71 connect, working oil input/output port C1, D1 difference of first circuit control module 71 Connected with the first hydraulic fluid port A, the second hydraulic fluid port B of the first loop hydraulic lock 8, the 3rd hydraulic fluid port A1 of the first loop hydraulic lock 8, the 4th oil Oil inlet and outlet LA1, the LB1 of mouth B1 respectively with the first executing agency 91 are connected, the pressure outlet of the first loop hydraulic lock 8 M connects with the load feedback pressure entrance F1 of Logic control module 17.

The oil inlet P 2 of the second servo loop control module 72, oil return inlet T 2 pressure oil with Oil-source control module 6 respectively Delivery outlet PC, oil return import mouth TC connection, working oil input/output port C2, D2 of the second servo loop control module 72 respectively with The first hydraulic fluid port A, the second hydraulic fluid port B connection of second servo loop hydraulic lock 8, the 3rd hydraulic fluid port A1, the 4th hydraulic fluid port of second servo loop hydraulic lock 8 Oil inlet and outlet LA2, the LB2 of B1 respectively with the second executing agency 92 are connected, the pressure outlet M of the second servo loop hydraulic lock 8 The brake unblock control mouth BR and second of load feedback pressure entrance F2, the second executing agency 92 with Logic control module 17 The load feedback oil-in CF2 connections of circuit control module 72.

The oil inlet P 3 of the tertiary circuit control module 73, oil return inlet T 3 pressure oil with Oil-source control module 6 respectively Delivery outlet PC, oil return import mouth TC connection, working oil input/output port C3, D3 of the tertiary circuit control module 73 respectively with Oil inlet and outlet LA3, LB3 connection of 3rd executing agency 93, two input ports of the tertiary circuit shuttle valve 18 are respectively with the 3rd Circuit control module 73 working oil input/output port C3, D3 connection, the feedback pressure delivery outlet FS3 of tertiary circuit shuttle valve 18 with The load feedback pressure entrance F3 connections of Logic control module 17.

The oil inlet P 4 of 4th circuit control module 74, oil return inlet T 4 are defeated with the pressure oil of Oil-source control module 6 respectively Export PC, oil return imports mouth TC connection, and working oil input/output port C4, D4 of the 4th circuit control module 74 are respectively with the Oil inlet and outlet LA4, LB4 connection of four executing agencies 94, two input ports of the 4th loop shuttle valve 18 are controlled with the 4th loop respectively Working oil input/output port C4, D4 connection of molding block 74, feedback pressure delivery outlet FS4 and the logic control of the 4th loop shuttle valve 18 The load feedback pressure entrance F4 connections of molding block 17.

The load feedback pressure output of the Logic control module 17 is to hydraulic fluid port Fm, the pressure testing and controlling mould of hydraulic fluid port Fm and system The pressure introduction port of block 101, the load feedback intake LS of Oil-source control module 6, pressure oil-source 5 load feedback control mouth X, The load feedback input port CB1 of the first circuit control module 71 and load feedback input port CB4 of the 4th circuit control module 74 Connect

Above-mentioned negative-feedback hydraulic work system process is as follows：Pressure oil-source 5 is from P mouths pressure oil output to Oil-source control module 6 pressure oil input port P0, Oil-source control module 6 are carried out according to the load pressure by its feedback pressure intake LS to oil sources After pressure and flow control, by controlled pressure oil from pressure oil outlet PC, first, two, three are supplied to, the loop control in four loops Pressure oil input port P1, P2, P3, P4 of unit processed, the oil return inlet T 1 of the circuit controls unit in first, two, three, four loops, T2, T3, T4, the oil return in each loop is imported into the oil return inlet T C of Oil-source control module, then pressure oil-source is returned to by the T0 that answers back；

Pressure oil is input to the pressure oil-in P1 of the first circuit control module 71, passes sequentially through adjustable throttling 711, pressure Force compensating valve 712, the first hydraulic fluid port A of the first loop hydraulic lock 8 is reached, by the first check valve, through the 3rd hydraulic fluid port A1 and loop The actuator port VA1 of control unit 201, reach the actuator port LA1 of the first executing agency 91, the first executing agency 91 of driving transports It is dynamic, while the oil return of the first executing agency 91, pass sequentially through hydraulic fluid port LB1, the actuator port VB1 of circuit controls unit 201, first time The four, the second hydraulic fluid port B1, B of road hydraulic lock 8, the actuator port D1 of the first circuit control module 71, oil return inlet T 1, are imported into oil The oil return inlet TC of source control module 6, at the same time, the pressure outlet M and its first hydraulic fluid port A of the first loop hydraulic lock 8 are led It is logical, the pressure of the first loop load, the feedback oil outlet LF1 of the first circuit controls unit 201 is reached by M mouths, is output to First feedback oil-in F1 of Logic control module 17；

Pressure oil is input to the pressure oil-in P2 of second servo loop control module 72, when direction valve 723 is in right position, pressure Power oil passes sequentially through pressure-compensated valve 721, adjustable throttling 722, and direction valve 723 reaches the first oil of second servo loop hydraulic lock 8 Mouth A, by the first check valve, reaches the second executing agency 92 through the 3rd hydraulic fluid port A1 and the actuator port VA2 of circuit controls unit 202 Actuator port LA2, the second executing agency 92 of driving moves, while the oil return of the second executing agency 92, from hydraulic fluid port LB2, successively Pass through the actuator port VB2 of circuit controls unit 202, the 4th B1, the second check valve, the second hydraulic fluid port of second servo loop hydraulic lock 8 B, actuator port D2 into second servo loop control module 72, again by direction valve 723, reach second servo loop control module 72 Oil return inlet T 1, then the oil return inlet TC of Oil-source control module 6 is imported into, at the same time, the pressure of second servo loop hydraulic lock 8 is drawn M turns on its first hydraulic fluid port A；When direction valve 723 is in left position, pressure oil passes sequentially through pressure-compensated valve 721, adjustable throttling Valve 722, direction valve 723 reach the second hydraulic fluid port B of second servo loop hydraulic lock 8, by the second check valve, through the 4th hydraulic fluid port B1 and the The actuator port VB2 of two tunnel control unit 202 reaches the actuator port LB2 of the second executing agency 92, while the second executing agency 92 Oil return, pass sequentially through hydraulic fluid port LA2, the actuator port VA2 of circuit controls unit 202, the three, the first of second servo loop hydraulic lock 8 Hydraulic fluid port A1, A, actuator port C2 into second servo loop control module 72, pass through direction valve 723 again, reach second servo loop control The oil return inlet T 1 of module 72, then the oil return inlet TC of Oil-source control module 6 is imported into, at the same time, second servo loop hydraulic lock 8 is pressed Power is drawn M and turned on its second hydraulic fluid port B；

The pressure of second servo loop load is output to the brake release control mouth BR of the second executing agency 92 by M mouths, releases The braking of executing agency 92, it is set to be moved under pressure oil driving；Load feedback oil is also fed to second servo loop control mould simultaneously The feedback pressure input port CF2 of block 72, act on pressure-compensated valve 721 and feed back oily control chamber, the valve element of pressure-compensated valve 721 exists Feedback pressure, spring force and it is derived under the control pressure effect of (i.e. the outlet of recuperation valve 721) before adjustable throttling, keeps real-time Dynamic equilibrium, make to be certain value to the pressure difference load feedback oil pressure point before choke valve, i.e. pressure compensation valve spring institute The pressure difference of setting, so that the oil-feed flow of executing agency 92 is reached by second servo loop control unit 202, only by adjustable throttling The aperture of valve determines that without being influenceed by load and P2 mouth pressure changes, while load feedback pressure also controls through second servo loop The feedback oil outlet LF2 of unit 202, it is output to the 2nd feedback oil-in F2 of Logic control module 17；

Pressure oil is input to the pressure oil-in P3 of tertiary circuit control module 73, passes sequentially through adjustable throttling 731, pressure Force compensating valve 732, the oil inlet of arrival direction valve 733, when during which fluid flows through pressure-compensated valve 732, its valve element is taking it respectively Balance is kept under two control pressures and spring-force driven dual that adjustable throttling 731 is imported and exported, makes the oil-feed flow of tertiary circuit Pressure difference is set by the permanent spring for pressure-compensated valve 732 of pressure difference caused by adjustable throttling 731, so that tertiary circuit enters Oil stream amount is only determined by the aperture of adjustable throttling 731, not by load and the pressure variations influence of oil inlet P 3；When direction valve 733 During in right position, pressure oil reaches the pressure oil outlet C3 of tertiary circuit control module 73 by direction valve 733, through the 3rd time The actuator port VA3 of road control unit 203 reaches the actuator port LA3 of the 3rd executing agency 93, and the 3rd executing agency 93 of driving is just To motion, while the oil return of the 3rd executing agency 93, from hydraulic fluid port LB3, the working oil of tertiary circuit control unit 203 is passed sequentially through Mouthful VB3, into tertiary circuit control module 73 actuator port D3, pass through direction valve 733 again, reach tertiary circuit control unit 203 oil return inlet T 3, then it is imported into the oil return inlet TC of Oil-source control module 6, at the same time, the signal of tertiary circuit shuttle valve 18 Mouth FS3 turns on the C3 mouths of tertiary circuit control module, and feedback oil of the load feedback pressure through tertiary circuit control unit 203 is defeated LF3 is exported, is output to the 3rd feedback oil-in F3 of Logic control module 17；When direction valve 733 is in left position, pressure oil leads to Cross the pressure oil outlet D3 that direction valve 733 reaches tertiary circuit control module 73, the work through tertiary circuit control unit 203 Hydraulic fluid port VB3 reaches the 3rd executing agency oil inlet LB3, the counter motion of driving the 3rd executing agency 93, while the 3rd executing agency 93 oil return, from hydraulic fluid port LA3, pass sequentially through the actuator port VA3 of tertiary circuit control unit 203, controlled into tertiary circuit The actuator port C3 of module 73, again by direction valve 733, reach the oil return inlet T 3 of tertiary circuit control unit 203, then be imported into The oil return inlet TC of Oil-source control module 6, at the same time, signal port FS3 and the tertiary circuit control module of the 3rd loop shuttle valve 18 D3 mouths conducting, feedback oil outlet LF3 of the load feedback pressure through tertiary circuit control unit 203, be output to logic control 3rd feedback oil-in F3 of module 17；

Pressure oil is input to the pressure oil-in P4 of the 4th circuit control module 74, passes sequentially through adjustable throttling 741, pressure Force compensating valve 742, the oil inlet of arrival direction valve 743, when during which fluid flows through pressure-compensated valve 742, its valve element is taking it respectively Balance is kept under two control pressures and spring-force driven dual that adjustable throttling 741 is imported and exported, makes the oil-feed flow in the 4th loop Pressure difference is set by the permanent spring for pressure-compensated valve 742 of pressure difference caused by adjustable throttling 741, so that the 4th loop is entered Oil stream amount is only determined by the aperture of adjustable throttling 741, not by load and the pressure variations influence of oil inlet P 4；When direction valve 743 During in right position, pressure oil reaches the pressure oil outlet C4 of the 4th circuit control module 74 by direction valve 743, through the 4th time The actuator port VA4 of road control unit 204 reaches the actuator port LA4 of the 4th executing agency 94, and the 4th executing agency 94 of driving is just To motion, while the oil return of the 4th executing agency 94, from hydraulic fluid port LB4, the working oil of the 4th circuit controls unit 204 is passed sequentially through Mouthful VB4, into the 4th circuit control module 74 actuator port D4, pass through direction valve 733 again, reach the 4th circuit controls unit 204 oil return inlet T 4, then it is imported into the oil return inlet TC of Oil-source control module 6, at the same time, the signal of the 4th loop shuttle valve 18 Mouth FS4 turns on the C4 mouths of the 4th circuit control module, and feedback oil of the load feedback pressure through the 4th circuit controls unit 204 is defeated LF4 is exported, the 4th to Logic control module 17 feeds back oil-in F4；When direction valve 743 is in left position, the pressure oil side of passing through The pressure oil outlet D4 of the 4th circuit control module 74 is reached to valve 743, through the actuator port of the 4th circuit controls unit 204 VB4 reaches the 4th executing agency oil inlet LB4, the counter motion of driving the 4th executing agency 94, while the 4th executing agency 94 Oil return, from hydraulic fluid port LA4, pass sequentially through the actuator port VA4 of the 4th circuit controls unit 204, into the 4th circuit control module 74 actuator port C4, again by direction valve 743, reach the oil return inlet T 4 of the 4th circuit controls unit 204, then be imported into oil sources The oil return inlet TC of control module 6, at the same time, the signal port FS4 of the 4th loop shuttle valve 18 and the 4th circuit control module D4 mouths turn on, feedback oil outlet LF4 of the load feedback pressure through the 4th circuit controls unit 204, to Logic control module 17 The 4th feedback oil-in F4；

Logic control module 17 will enter into tetra- load pressures of F1, F2, F3, F4 and be compared, after by maximum load pressure Power passes through Fm mouths：

Pressure testing and controlling module 101 is input to, display is monitored to load pressure or feeds back to control system and is based on The condition control of load feedback, realizes and is shown or fed back with the real-time monitoring of a point-to-points individual timesharing moving loads；

The load feedback pressure entrance CB1 of the first circuit control module 71 is output to, enters the anti-of pressure-compensated valve 712 Present oily control chamber, control pressure after adjustable throttling 711 is taken from of the valve element of pressure-compensated valve 712, come from LS mouths Under maximum load feedback pressure and (negligible) effect of spring force, balance is kept, makes the pressure after the first loop adjustable throttling 711 Power is equal to maximum load pressure；

The load feedback pressure entrance CB4 of the 4th circuit control module 74 is output to, enters the anti-of pressure-compensated valve 742 Present oily control chamber, control pressure after adjustable throttling 741 is taken from of the valve element of pressure-compensated valve 742, come from LS mouths Under maximum load feedback pressure and (negligible) effect of spring force, balance is kept, makes the pressure after the 4th loop adjustable throttling 741 Power is equal to maximum load pressure；

The load feedback pressure entrance LS of Oil-source control module 6 is output to, the pressure oil-in of overflow valve 61 is reached and patrols Valve feedback pressure acting chamber is collected, overflow valve 61 is defined to the load feedback pressure of maximum by its pressure spring, works as maximum When load exceedes 61 setting value of overflow valve, P0 pressure acts on the valve element of logical valve 62 and overcomes spring force and loaded from LS mouths valve Feedback pressure, opens valve element, and flow system flow returns to the T0 mouths of Oil-source control module, return pressure oil-source from the overflow of logic 62 Oil return inlet T, so as to realize the pressure overload protection to system.When load pressure is not more than the setting value of overflow valve 61, logic The valve element of valve in the control pressure from P0 mouths, come maximum load feedback pressure and spring-force driven dual to LS mouths under, keep flat Weighing apparatus, system pressure is set to maintain the pressure value of higher than maximum load pressure spring setting, this pressure differential is exactly equal to the Primary Ioops oil-feed flow flow through the first loop adjustable throttling 711 caused by pressure difference, be also equal to the 4th loop oil-feed flow and flow through The oil-feed flow of pressure difference caused by 4th loop adjustable throttling 741, then the first loop, completely by adjustable throttling 711 Aperture determines, without being influenceed by system load pressure change, the oil-feed flow in the 4th loop, completely by adjustable throttling 741 Aperture determines, without being influenceed by system load pressure change；

The load feedback pressure entrance X of the load-sensitive valve of the load sensitive pump 51 of pressure oil-source 5 is output to, makes load quick The output flow for feeling pump meets：Load-sensitive pump discharge P is certain value to the pressure difference between the pressure point of feedback pressure, that is, is loaded The pressure differential resetting value of the load-sensitive valve of sensitive pump, then each loop oil-feed flow is in opening by each loop adjustable throttling completely Degree determines, is influenceed without being changed by system load,

In summary, such as Fig. 6 .1 provided by the utility model four loop load feedback hydraulic systems, in flow saturation bar Under part, each loop flow is determined by the adjustable throttling aperture in each loop itself completely, is not influenceed by system load change, real Show flow system flow dispensing on demand, and the load stiffness of loop flow is high, while system pressure is maintained all the time than maximum A high fixed value (flow system flow control pressure difference) is loaded, realizes the real-time dispensing on demand of system pressure, energy saving of system is high Effect.

Embodiment described above only expresses several embodiments of the present utility model, and its description is more specific and detailed, But therefore it can not be interpreted as the limitation to utility model patent scope.It should be pointed out that the common skill for this area For art personnel, without departing from the concept of the premise utility, various modifications and improvements can be made, these are belonged to The scope of protection of the utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.

Claims (10)

1. a kind of hydraulic lock, it is characterised in that including valve body (3), the first check valve (1) and control piston (2)；

Pilot chamber (31) is horizontally arranged with the valve body (3), the control piston (2) can be arranged on pilot transverse shifting Left pilot chamber and right pilot chamber, entrance and the left side of first check valve (1) are separated to form in chamber (31) and by pilot chamber (31) Pilot chamber connects, and the left end of control piston (2) is provided with the left push rod (21) that can open the first check valve (1)；

The first hydraulic fluid port (A), the second hydraulic fluid port (B), the 3rd hydraulic fluid port (A1), the 4th hydraulic fluid port (B1), pressure are provided with the valve body (3) Outlet (M), the inner of first hydraulic fluid port (A), the inner of the second hydraulic fluid port (B) connect with left pilot chamber, right pilot chamber respectively, The inner of 3rd hydraulic fluid port (A1), the 4th hydraulic fluid port (B1) it is inner respectively with the exporting of first check valve (1), right pilot Chamber connects, and the inner of the pressure outlet (M) connects with the middle part of pilot chamber (31)；

When the control piston (2) is moved to the left precalculated position, the inner and right pilot chamber of the pressure outlet (M) connects Logical, the left push rod (21) opens the first check valve (1)；It is described when the control piston (2) moves right to precalculated position The inner of pressure outlet (M) connects with left pilot chamber；It is described when the control piston (2) is located in the middle part of pilot chamber (31) Piston (2) is controlled to block the inner of the pressure outlet (M).

2. hydraulic lock according to claim 1, it is characterised in that be provided with lateral direction penetrating valve body (3) in the valve body (3) Main valve hole, first check valve (1) is arranged on the left end of main valve hole, and the right-hand member of the main valve hole sets limited location to block (15), main valve hole stage casing forms the pilot chamber (31).

3. hydraulic lock according to claim 1, it is characterised in that also include the inner and the right side for being arranged at the 4th hydraulic fluid port (B1) The second check valve (4) between pilot chamber, the entrance of second check valve (4), outlet respectively with right pilot chamber, the 4th hydraulic fluid port (B1) inner connection, the right-hand member of the control piston (2) are provided with the right push rod (22) that can open the second check valve (4)；When When the control piston (2) moves right to precalculated position, the inner of the pressure outlet (M) connects with left pilot chamber, institute State right push rod (22) and open the second check valve (4).

4. hydraulic lock according to claim 3, it is characterised in that be provided with lateral direction penetrating valve body (3) in the valve body (3) Main valve hole, main valve hole stage casing forms the pilot chamber (31), and first check valve (1), the second check valve (4) are set respectively Left end, right-hand member in main valve hole.

5. hydraulic lock according to claim 4, it is characterised in that first check valve (1) is included from left to right successively The first valve blanking cover (13), the first spring (12), the first valve element (11), the first valve seat (14) being arranged in main valve hole, described One end of one spring (12) is connected on the first valve blanking cover (13), and the other end is connected on the first valve element (11) so that the first valve element (11) valve opening on the first valve seat (14) is blocked, the left part of the left push rod (21) is relative with the first valve element (11)；

And/or second check valve (4) includes being successively set on the second valve blanking cover (43) in main valve hole, the from right to left Two springs (42), the second valve element (41), the second valve seat (44), one end of the second spring (42) are connected to the second valve blanking cover (43) on, the other end is connected on the second valve element (41) so that the second valve element (41) blocks the valve opening on the second valve seat (44), institute The right part for stating right push rod (22) is relative with the second valve element (41).

6. hydraulic lock according to claim 5, it is characterised in that central axis, the left push rod of the control piston (2) (21) central axis, the centerline parallel of the first valve element (11) or coaxial；

And/or central axis, the central axis of right push rod (22) and the center of the second valve element (41) of the control piston (2) Line is parallel or coaxial.

7. hydraulic lock according to any one of claim 1 to 6, it is characterised in that the valve body (3) and control piston (2) back-moving spring (16) for making control piston (2) be located in the middle part of pilot chamber (31) is provided between.

8. hydraulic lock according to any one of claim 1 to 6, it is characterised in that described in being set above the valve body (3) First hydraulic fluid port (A), the second hydraulic fluid port (B), corresponding setting the 3rd hydraulic fluid port (A1) in valve body (3) lower section, the 4th hydraulic fluid port (B1), pressure outlet (M), pressure outlet (M) outer end and the outer end position of the 3rd hydraulic fluid port (A1) and the 4th hydraulic fluid port (B1) In in approximately the same plane sealing area；

Or, first hydraulic fluid port (A), the second hydraulic fluid port (B), pressure outlet (M), the valve body are set above the valve body (3) (3) corresponding setting the 3rd hydraulic fluid port (A1) in lower section, the 4th hydraulic fluid port (B1), pressure outlet (M) outer end and first The outer end of hydraulic fluid port (A) and the second hydraulic fluid port (B) is located in approximately the same plane sealing area.

9. a kind of load feedback hydraulic system, including pressure oil-source (5), Oil-source control module (6), circuit control module (7), hold Row mechanism (9), it is characterised in that also include the hydraulic lock (8) as any one of claim 1 to 8, the pressure oil-source (5) oil inlet (P0) with the Oil-source control module (6), oil return opening (T0) connect respectively for pressure oil port (P), oil return opening (T) It is logical, the pressure oil outlet (PC) of the Oil-source control module (6), oil return import mouth (TC) respectively with circuit control module (7) Oil inlet (P1), oil return opening (T1) connection, the working oil input/output port (C1, D1) of the circuit control module (7) is respectively The first hydraulic fluid port (A), the second hydraulic fluid port (B) with hydraulic lock (8) connect, the 3rd hydraulic fluid port (A1), the 4th hydraulic fluid port of the hydraulic lock (8) (B1) connected respectively with the oil inlet and outlet (LA, LB) of executing agency (9)；

The pressure outlet (M) of the hydraulic lock (8) connects with the control port (BR) of executing agency (9), by load feedback Pressure signal is used for the logic control with load feedback pressure correlation；

And/or the pressure outlet (M) of the hydraulic lock (8) connects with the pressure testing and controlling module (10) of system, to load pressure It is monitored display or feeds back to control system and carries out the condition control based on load feedback；

And/or the feedback pressure intake (CF1) of the pressure outlet (M) of the hydraulic lock (8) and circuit control module (7) Connection, carry out the flow control based on load pressure feedback；

And/or the pressure outlet (M) of the hydraulic lock (8) and the feedback oil intake (LS) of Oil-source control module (6) connect It is logical, carry out the pressure based on load pressure feedback and flow control；

And/or the pressure outlet (M) of the hydraulic lock (8) connects with the load feedback control mouth (X) of pressure oil-source (5), together When pressure outlet (M) connected with the feedback oil intake (LS) of Oil-source control module (6), carry out based on load pressure feedback Or pressure and flow control.

10. a kind of load feedback hydraulic system, including pressure oil-source (5), Oil-source control module (6), Logic control module (17), At least two executing agencies, each executing agency are correspondingly arranged on a circuit controls unit, the pressure of the pressure oil-source (5) The oil inlet (P0) with the Oil-source control module (6), oil return opening (T0) connect respectively for hydraulic fluid port (P), oil return opening (T), the oil The pressure oil outlet (PC) of source control module (6), oil return import mouth (TC) respectively the oil inlet with each circuit controls unit, Oil return opening connects, it is characterised in that at least one circuit controls unit is included as any one of claim 1 to 8 Hydraulic lock (8), two working oil input/output ports of the circuit controls unit not including described hydraulic lock (8) respectively with it is corresponding Executing agency oil inlet, oil-out connection, the feedback oil outlet of circuit controls unit and Logic control module (17) Load feedback pressure entrance connects；Two working oil input/output ports point of the circuit controls unit including the hydraulic lock (8) The first hydraulic fluid port (A), the second hydraulic fluid port (B) not with hydraulic lock (8) connect, the 3rd hydraulic fluid port (A1), the 4th hydraulic fluid port of hydraulic lock (8) (B1) oil inlet with corresponding executing agency, oil-out connection respectively, pressure outlet (M) and Logic control module (17) Load feedback pressure entrance connects；

The load feedback pressure of each load feedback pressure entrance is compared by the Logic control module (17), and by maximum Load feedback pressure output is to load feedback pressure output (Fm)；

The load feedback pressure output (Fm) is connected with the pressure testing and controlling module (102) of system, and load pressure is supervised Survey display or feed back to control system and carry out the condition control based on load feedback；

And/or the load feedback pressure output (Fm) and the load feedback intake (LS) of Oil-source control module (6) connect It is logical, carry out the pressure based on load feedback and flow control；

And/or load feedback pressure output (Fm) connects with the load feedback control mouth (X) of pressure oil-source (5), at the same with oil Feedback oil intake (LS) connection of source control module (6) carries out based on load pressure feedback or pressure and flow control；

And/or load feedback pressure output (Fm) connects with the load feedback input port of at least one circuit controls unit, enters Flow Compliance control of the row based on load feedback.