CN205207311U - Meso position burden flow valve, swing arm energy -saving control system and excavator - Google Patents
Meso position burden flow valve, swing arm energy -saving control system and excavator Download PDFInfo
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- CN205207311U CN205207311U CN201520881567.4U CN201520881567U CN205207311U CN 205207311 U CN205207311 U CN 205207311U CN 201520881567 U CN201520881567 U CN 201520881567U CN 205207311 U CN205207311 U CN 205207311U
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Abstract
The utility model relates to a meso position burden flow valve, swing arm energy -saving control system and excavator, wherein, meso position burden flow valve includes variable throttle, variable throttle's import department is equipped with the negative feedback mouth, the inside throttling groove that forms of variable throttle, the last guide pressure control end that is equipped with of variable throttle, the control circuit in the guide is connected to guide pressure control end, is used for control the through -flow aperture of throttling groove is in order to adjust variable throttle's exit flow is poor, the negative feedback mouth can be based on variable throttle's the poor burden feedback pressure signal that forms of exit flow. The utility model discloses can form different negative feedback pressure signal to negative feedback pressure signal according to the difference adjusts main pump delivery, avoids leading to the fact the waste of main pump power.
Description
Technical field
The utility model relates to engineering machinery field, particularly relates to a kind of meta minus flow valve, swing arm energy-saving control system and excavator.
Background technique
Middle great tonnage hydraulic excavator, as the efficient civil machinery of one, is widely used in surface mine digging, large foundation construction.Middle large-tonnage excavator in the market generally adopts discharge of main pump and the inversely proportional inverted flux control hydraulic system of meta oil return pilot pressure, the structural type that multi-way valve respectively joins employing is all out nuclear forms, reverse feedback throttle orifice is arranged in the meta oil circuit of multi-way valve after each connection selector valve, before oil sump tank, realizes hydraulic pressure pump delivery regulate according to the pressure size of throttle orifice ingress.The pressure of reverse feedback throttle orifice feedback makes the discharge capacity of pump when meta be in higher value, causes meta flow loss.
In middle large-tonnage descending movable arm of excavator process, adopt valve core inside flow revived structure, poor according to the large and small cavity pressure of oil cylinder, realize regeneration function.But owing to being often in the state that meta and working position work in multi-way valve commutation process simultaneously, causing multiple directional control valve meta reverse feedback pressure to regulate discharge of main pump with steady state value, cause the power dissipation of pump.Along with the development of hydraulic excavator saving energy technology, high, the inefficient problem of current excavator energy consumption becomes a problem demanding prompt solution.
The control form that existing excavator inverted flux control mode adopts meta oil return pilot pressure and discharge of main pump to be inversely proportional to, reverse feedback restriction adopts constant restriction, after being placed on multiple directional control valve, before oil sump tank.In swing arm dropping process, according to the relief valve pressure in parallel with meta throttle orifice, feed back to main pump inverted flux control port, thus regulate discharge of main pump, make discharge of main pump fast and stable at a steady state value, and realize fuel feeding by this constant discharge.
There is following problem in reverse feedback restriction of the prior art:
1) increase of existing excavator swing arm flow regeneration throttle orifice idle rod falling speed, regenerant flow increases, but reverse feedback restriction adopts constant restriction, makes variable displacement pump discharge capacity be stabilized in a higher value instantaneously, causes pump power to waste.
2) in prior art, meta reverse feedback pressure and swing arm falling speed have nothing to do, when swing arm whereabouts pilot pressure increases, falling speed increases, meta reverse feedback pressure but remains on steady state value, cause discharge of main pump according to the size of swing arm falling speed, and can not carry out corresponding adjustment, spill losses is serious.
Model utility content
The purpose of this utility model proposes a kind of meta minus flow valve, swing arm energy-saving control system and excavator, meta minus flow valve can form different reverse feedback pressure signals according to the swing arm pilot pressure that falls, so that regulate main pump delivery, avoid the waste causing main pump power.
For achieving the above object, the utility model provides a kind of meta minus flow valve, it comprises variable throttle valve, the inlet of described variable throttle valve is provided with reverse feedback mouth, described variable throttle valve inside forms throttling groove, described variable throttle valve is provided with pilot pressure control end, described pilot pressure control end is connected to pilot control oil circuit, for controlling the through-flow aperture of described throttling groove, to regulate the import and export difference in flow of described variable throttle valve, described reverse feedback mouth can form reverse feedback pressure signal according to the import and export difference in flow of described variable throttle valve.
One preferably or in embodiment, meta minus flow valve also comprises relief valve, and described variable throttle valve and described relief valve are connected in parallel.
One preferably or in embodiment, described variable throttle valve comprises throttle valve body, throttling valve core and throttle valve spring is provided with in described throttle valve body, the end of described throttle valve body is provided with throttle valve plug, described throttling groove is formed between described throttling valve core and described throttle valve body, described pilot pressure control end comprises the pilot pressure control chamber formed between described throttling valve core and described throttle valve plug, also comprise the pilot pressure through hole of the described pilot pressure control chamber of the connection that described throttle valve plug is arranged, the different oil pressure provided by described pilot pressure control end can promote described throttling valve core to-and-fro motion, area is communicated with what regulate the outlet of described throttling groove and described variable throttle valve.
One preferably or in embodiment, also form oil suction chamber between described throttling valve core and described throttle valve body, described throttling groove is communicated with the import of described variable throttle valve by described oil suction chamber.
For achieving the above object, the utility model additionally provides a kind of swing arm energy-saving control system, it comprises the meta minus flow valve in main pump, multiple directional control valve, boom cylinder and above-mentioned any embodiment, described main pump is connected to described multiple directional control valve, described multiple directional control valve is connected to described boom cylinder and described meta minus flow valve, and the reverse feedback pressure signal formed in described meta minus flow valve is for regulating described main pump delivery.
One preferably or in embodiment, described multiple directional control valve comprises hoist pilot control end and the whereabouts pilot control end for controlling swing arm whereabouts that hoist for controlling swing arm, and described whereabouts pilot control end is connected to the pilot pressure control end of described variable throttle valve.
One preferably or in embodiment, described multiple directional control valve at least comprises meta, the first working position and the second working position, at meta, described multiple directional control valve is communicated with described meta minus flow valve, and at the first working position and the second working position, described multiple directional control valve is all communicated with described boom cylinder, be respectively used to the whereabouts and the vertical motion that realize swing arm, wherein, in swing arm dropping process, meta and first working position of described multiple directional control valve work simultaneously.
One preferably or in embodiment, first actuator port of described multiple directional control valve is communicated with described meta minus flow valve, second actuator port and the 3rd actuator port of described multiple directional control valve are communicated with rodless cavity and the rod chamber of described boom cylinder respectively, first filler opening of described multiple directional control valve is communicated with described main pump with the second filler opening, and the return opening of described multiple directional control valve is communicated with fuel tank.
One preferably or in embodiment, described multiple directional control valve is at meta, first filler opening of described multiple directional control valve is communicated with the first actuator port, second filler opening, return opening, second actuator port and the 3rd actuator port all end, described multiple directional control valve is at the first working position, first filler opening of described multiple directional control valve and the cut-off of the first actuator port, second filler opening is communicated with the 3rd actuator port, second actuator port is communicated with return opening, described multiple directional control valve is at the second working position, first filler opening of described multiple directional control valve and the cut-off of the first actuator port, second filler opening is communicated with the second actuator port, 3rd actuator port is communicated with return opening.
One preferably or in embodiment, described multiple directional control valve is at the first working position, second filler opening of described multiple directional control valve is also connected a branch road with the oil circuit between the 3rd actuator port, described branch road is also communicated with the oil circuit between return opening with the second actuator port of described multiple directional control valve, and described branch road is provided with one-way valve, the filler opening of described one-way valve is communicated with the oil circuit between the second actuator port of described multiple directional control valve and return opening.
One preferably or in embodiment, the oil circuit that second actuator port of described multiple directional control valve is communicated with the rodless cavity of described boom cylinder is provided with luffing jib maintaining valve, and described luffing jib maintaining valve is for controlling the break-make of oil circuit between the second actuator port of described multiple directional control valve and the rodless cavity of described boom cylinder.
One preferably or in embodiment, described luffing jib maintaining valve comprises cartridge valve and pilot slide valve, when the guide of described pilot slide valve holds without pilot pressure, the spring chamber being communicated with described cartridge valve without spring chamber by described pilot slide valve of described cartridge valve, described cartridge valve is closed, and the oil circuit between the second actuator port of described multiple directional control valve and the rodless cavity of described boom cylinder disconnects; When the guide of described pilot slide valve holds and has pilot pressure, the spring chamber of described cartridge valve is communicated with fuel tank by described pilot slide valve, and described cartridge valve is opened, and the oil circuit between the second actuator port of described multiple directional control valve and the rodless cavity of described boom cylinder is communicated with.
For achieving the above object, the utility model additionally provides a kind of excavator, and it comprises the swing arm energy-saving control system in above-mentioned any embodiment.
Based on technique scheme, the utility model at least has following beneficial effect:
The variable throttle valve inside that the utility model provides is formed with throttling groove, variable throttle valve is provided with pilot pressure control end, pilot pressure control end is connected to pilot control oil circuit, pilot control oil circuit can provide different oil pressure, to control the through-flow aperture of throttling groove, and then the import and export difference in flow of variable throttle valve can be regulated, reverse feedback mouth can form different reverse feedback pressure signals according to the import and export difference in flow of variable throttle valve, different reverse feedback pressure signals can be used in regulating main pump delivery, avoids the waste causing main pump power.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide further understanding of the present utility model, and form a application's part, schematic description and description of the present utility model, for explaining the utility model, is not formed improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is applied to the principle schematic in swing arm energy-saving control system for meta minus flow valve that the utility model provides;
The view of swing arm energy-saving control system in swing arm dropping process that Fig. 2 provides for the utility model;
The meta minus flow valve schematic diagram that Fig. 3 provides for the utility model.
Attached number in the figure:
1-multiple directional control valve; 11-hoists pilot control end; 12-whereabouts pilot control end;
2-luffing jib maintaining valve; 21-cartridge valve; 22-pilot slide valve;
3-boom cylinder; 4-fuel tank; 5-relief valve;
6-variable throttle valve; 61-throttling groove; 62-pilot pressure control end; 63-throttle valve body; 64-throttling valve core; 65-throttle valve spring; 66-throttle valve plug; 67-oil suction chamber;
7-reverse feedback mouth;
A-first oil circuit; B-second oil circuit; C-the 3rd oil circuit; D-pilot control oil circuit; E-first oil duct; F-second oil duct; Q-working connection.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technological scheme in embodiment is clearly and completely described.Obviously, described embodiment is only a part of embodiment of the present utility model, instead of whole embodiments.Based on embodiment of the present utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
In description of the present utility model, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end ", " interior ", orientation or the position relationship of the instruction such as " outward " are based on orientation shown in the drawings or position relationship, only the utility model and simplified characterization for convenience of description, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore the restriction to the utility model protection domain can not be interpreted as.
When the inverted flux control of meta minus flow valve refers to that the pressure that meta feeds back to main pump increases gradually, main pump pivot angle reduces main pump flow gradually, and main pump flow becomes negative correlativing relation with meta pressure.
As shown in Figure 1 and Figure 2, the meta minus flow valve provided for the utility model is applied in the illustrative examples on swing arm energy conserving system.
The meta minus flow valve that the utility model provides comprises variable throttle valve 6, the inlet of variable throttle valve 6 is provided with reverse feedback mouth 7, variable throttle valve 6 inside forms throttling groove 61 (as shown in Figure 3), variable throttle valve 6 is provided with pilot pressure control end 62, pilot pressure control end 62 is connected to pilot control oil circuit d, pilot control oil circuit d can provide different pilot pressures, to control the through-flow aperture of throttling groove 61, and then the import and export difference in flow of variable throttle valve 6 can be regulated, reverse feedback mouth 7 can form different reverse feedback pressure signals according to the import and export difference in flow of variable throttle valve 6, can be used in regulating main pump delivery according to different reverse feedback pressure signals, avoid the waste causing main pump power.Such as: when swing arm whereabouts pilot pressure increases, the speed that swing arm falls increases, the oil pressure that pilot control oil circuit d provides increases, the import and export difference in flow of variable throttle valve 6 increases, reverse feedback pressure increase, therefore, it is possible to regulate main pump to make its discharge capacity reduce according to load feedback pressure signal, and then reduce the flow loss of main pump, improve the capacity usage ratio of system.
The meta minus flow valve that the utility model provides also comprises relief valve 5, variable throttle valve 6 and relief valve 5 are connected in parallel, the import of variable throttle valve 6 and the import of relief valve 5 are connected to oil-feed oil circuit jointly, the outlet of variable throttle valve 6 and the outlet of relief valve 5 are connected to oil return circuit jointly, and oil return circuit is connected to fuel tank 4.The pressure of relief valve 5 and reverse feedback pressure, feed back to the inverted flux control mouth of main pump, can regulate main pump delivery, and then avoid spill losses.
As shown in Figure 3, variable throttle valve 6 comprises throttle valve body 63, throttling valve core 64 and throttle valve spring 65 is provided with in throttle valve body 63, the end of throttle valve body 63 is provided with throttle valve plug 66, throttling groove 61 and the oil suction chamber 67 of annular is formed between throttling valve core 64 and throttle valve body 63, throttling groove 61 is communicated with the import of variable throttle valve 6 by oil suction chamber 67, the area of throttling groove 61 is connected to the outlet of variable throttle valve 6, pilot pressure control end 62 comprises the pilot pressure control chamber formed between throttling valve core 64 and throttle valve plug 66, also comprise the pilot pressure through hole of the connection pilot pressure control chamber that throttle valve plug 66 is arranged, the different oil pressure provided by pilot pressure control end 62 can promote throttling valve core 64 to-and-fro motion, area is communicated with what regulate the outlet of throttling groove 61 and variable throttle valve 6.Such as: under the state that the oil pressure of pilot pressure control end 62 increases gradually, throttling groove 61 also increases gradually with the area of the outlet of variable throttle valve 6, the rate of discharge of variable throttle valve 6 increases gradually, raise gradually to make relief valve 5 pressure, reverse feedback pressure increases gradually, according to the reverse feedback pressure signal increased gradually, reduce main pump delivery gradually, reduce flow loss.
Further, throttle valve plug 66 can adopt with throttle valve body 63 and be threaded, and the side of throttling valve core 64 arranges throttle valve plug 66, arranges throttle valve spring 65 between the opposite side of throttling valve core 64 and throttle valve body 63.
As Fig. 1, shown in Fig. 2, for the illustrative examples of the swing arm energy-saving control system that the utility model provides, in this illustrative examples, swing arm energy-saving control system comprises main pump, multiple directional control valve 1, meta minus flow valve in boom cylinder 3 and above-mentioned any embodiment, main pump is connected to multiple directional control valve 1 by working connection Q, multiple directional control valve 1 is connected to boom cylinder 3 and meta minus flow valve, the hydraulic oil that during meta, main pump pumps enters multiple directional control valve 1 through working connection Q, meta minus flow valve is entered by multiple directional control valve 1, the reverse feedback pressure signal formed in meta minus flow valve is for regulating main pump delivery.After meta minus flow valve is placed on multiple directional control valve 1 and before oil sump tank 4, can bit traffic in multiple directional control valve 1 be fed back on main pump with pilot pressure form, realize discharge of main pump and regulate.
Multiple directional control valve 1 comprises hoist pilot control end 11 and the whereabouts pilot control end 12 for controlling swing arm whereabouts that hoist for controlling swing arm, whereabouts pilot control end 12 is connected to the pilot pressure control end 62 of variable throttle valve 6, and whereabouts pilot control end 12 and pilot pressure control end 62 are connected to swing arm whereabouts pilot control oil circuit d jointly.During the pressure increase of swing arm whereabouts pilot control oil circuit d, the speed that swing arm falls increases, the flow of variable throttle valve 6 increases, swing arm whereabouts pilot pressure is adopted to control the aperture of variable throttle valve 6, can realize the effect that reverse feedback pressure and swing arm falling speed synchronously increase, reverse feedback pressure increase, can regulate main pump delivery to reduce gradually, reduce the flow loss of main pump, improve the capacity usage ratio of system.
Variable throttle valve 6 is only relevant with swing arm whereabouts pilot pressure, and when swing arm whereabouts pilot pressure is zero, variable throttle valve 6 keeps constant valve port opening, does not affect the normal work of other multi-way valve.In swing arm uphill process, variable throttle valve 6 does not play regulatory role, and is only fixed on constant valve port opening, keeps the larger rate of climb.
Multiple directional control valve 1 at least comprises meta, the first working position and the second working position, at meta, multiple directional control valve 1 is communicated with meta minus flow valve, at the first working position and the second working position, multiple directional control valve 1 is all communicated with boom cylinder 3, is respectively used to the whereabouts and the vertical motion that realize swing arm, wherein, in swing arm dropping process, meta and first working position of multiple directional control valve 1 work simultaneously.
First actuator port of multiple directional control valve 1 is communicated with meta minus flow valve, second actuator port of multiple directional control valve 1 is communicated with the rodless cavity of boom cylinder 3 by the second oil circuit b, 3rd actuator port of multiple directional control valve 1 is communicated with the rod chamber of boom cylinder 3 by the first oil circuit a, first filler opening of multiple directional control valve 1 is communicated with main pump with the second filler opening, and, the oil circuit that main pump is communicated with the second actuator port of multiple directional control valve 1 is provided with one-way valve, the inlet communication main pump of one-way valve, second actuator port of the outlet multiple directional control valve of one-way valve, the return opening of multiple directional control valve 1 is communicated with fuel tank 4.
Multiple directional control valve 1 at least comprises the first filler opening, the second filler opening, return opening, the first actuator port, the second actuator port and the 3rd actuator port.Multiple directional control valve 1 is at meta, first filler opening of multiple directional control valve 1 is communicated with the first actuator port, second filler opening, return opening, second actuator port and the 3rd actuator port all end, multiple directional control valve 1 is at the first working position, first filler opening of multiple directional control valve 1 and the cut-off of the first actuator port, second filler opening is communicated with the 3rd actuator port, second actuator port is communicated with return opening, multiple directional control valve 1 is at the second working position, first filler opening of multiple directional control valve 1 and the cut-off of the first actuator port, second filler opening is communicated with the second actuator port, 3rd actuator port is communicated with return opening.
Multiple directional control valve 1 is at the first working position, second filler opening of multiple directional control valve 1 is also connected a branch road with the oil circuit between the 3rd actuator port, branch road is also communicated with the oil circuit between return opening with the second actuator port of multiple directional control valve 1, and branch road is provided with regeneration one-way valve, the filler opening of regeneration one-way valve is communicated with the oil circuit between the second actuator port of multiple directional control valve 1 and return opening.
The second oil circuit b that second actuator port of multiple directional control valve 1 is communicated with the rodless cavity of boom cylinder 3 is provided with luffing jib maintaining valve 2, and luffing jib maintaining valve 2 is for controlling the break-make of oil circuit between the second actuator port of multiple directional control valve 1 and the rodless cavity of boom cylinder 3.
Luffing jib maintaining valve 2 comprises cartridge valve 21 and pilot slide valve 22, pilot slide valve 22 comprises the first working position and the second working position, and guide's end of pilot slide valve 22 has pressure, and pilot slide valve 22 is in the first working position, the guide of pilot slide valve 22 holds without pressure, and pilot slide valve 22 is in the second working position.When the guide of pilot slide valve 22 holds without pilot pressure, pilot slide valve 22 is in the second working position, the spring chamber being communicated with cartridge valve 21 without spring chamber by pilot slide valve 22 of cartridge valve 21, cartridge valve 21 is closed, and the oil circuit between the second actuator port of multiple directional control valve 1 and the rodless cavity of boom cylinder 3 disconnects; When the guide of pilot slide valve 22 holds and has pilot pressure, pilot slide valve 22 is in the first working position, the spring chamber of cartridge valve 21 is communicated with fuel tank 4 by pilot slide valve 22, and cartridge valve 21 is opened, and the oil circuit between the second actuator port of multiple directional control valve 1 and the rodless cavity of boom cylinder 3 is communicated with.
Enumerate a specific embodiment of swing arm energy-saving control system below.
As shown in Figure 1, multiple directional control valve 1 is connected with the rod chamber of boom cylinder 3 through the first oil circuit a, and the rodless cavity fluid of boom cylinder 3 is connected with luffing jib maintaining valve 2 through the second oil circuit b, and wherein, luffing jib maintaining valve 2 comprises cartridge valve 21 and pilot slide valve 22.Multiple directional control valve 1 meta is in series through the 3rd oil circuit c and variable throttle valve 6, and wherein, variable throttle valve 6 is in parallel with relief valve 5, and middle bit traffic off-load is to fuel tank 4.
As shown in Figure 2, in swing arm dropping process, swing arm whereabouts pilot pressure is applied to the whereabouts pilot control end 12 of multiple directional control valve 1, the working position of multiple directional control valve 1 is moved to the first working position gradually by meta, and simultaneously swing arm whereabouts pilot pressure is applied to guide's end of the pilot slide valve 22 in the pilot pressure control end 62 of variable throttle valve 6 and luffing jib maintaining valve 2.The high pressure oil that main pump exports is through the rod chamber of multiple directional control valve 1 to boom cylinder 3, the piston promoting boom cylinder 3 moves down, hydraulic oil through the rodless cavity of boom cylinder 3 to luffing jib maintaining valve 2, now, first working position work of pilot slide valve 22, swing arm whereabouts hydraulic oil is applied on cartridge valve 21, under hydraulic oil effect, cartridge valve 21 overcomes spring force and opens, boom cylinder 3 rodless cavity hydraulic oil arrives multiple directional control valve 1 through cartridge valve 21, when swing arm rodless cavity pressure is greater than rod chamber pressure, the regeneration one-way valve of multiple directional control valve 1 inside is opened, the hydraulic oil of boom cylinder 3 rodless cavity regenerates to boom cylinder 3 rod chamber through multiple directional control valve 1.
While boom cylinder 3 falls, swing arm whereabouts pilot pressure is applied to the pilot pressure control end 62 in variable throttle valve 6, as shown in Figure 3, the hydraulic oil that main pump exports is through multiple directional control valve 1, the first oil duct e on the throttle valve body 63 of variable throttle valve 6 arrives oil suction chamber 67, the throttling groove 61 of hydraulic oil in throttling valve core 64, fuel tank 4 is flow to again through the second oil duct f, the pilot pressure being now applied to variable throttle valve 6 pilot pressure control end 62 increases gradually, guide's hydraulic oil is applied to the active force that throttling valve core 64 right-hand member overcomes throttling spring, make throttling valve core 64 to moving to left, flow area between throttling valve core 64 and the second oil duct f increases gradually, meta oil return flow is caused to increase, relief valve 5 pressure raises gradually, namely meta reverse feedback pressure increases gradually, discharge of main pump reduces gradually, self gravitation potential energy is utilized in swing arm dropping process, reduce the flow loss in swing arm dropping process, improve capacity usage ratio.
The swing arm energy-saving control system that the utility model provides can be applied on the engineering equipments such as excavator, hoist, dynamic compaction machinery.
The excavator that the utility model provides, it comprises the swing arm energy-saving control system in above-mentioned any embodiment, swing arm energy-saving control system comprises the meta minus flow valve that the utility model provides, in swing arm dropping process, the through-current capacity of the variable throttle valve 6 in meta minus flow valve increases gradually, reverse feedback pressure increases gradually, and then can reduce gradually by discharge of main pump, to reduce the energy dissipation in swing arm dropping process.
In description of the present utility model; it will be appreciated that; the word such as " first ", " second ", " the 3rd " is used to limit component; be only used to be convenient to distinguish above-mentioned parts; as there is no Stated otherwise; above-mentioned word does not have particular meaning, therefore can not be interpreted as the restriction to the utility model protection domain.
Finally should be noted that: above embodiment is only in order to illustrate that the technical solution of the utility model is not intended to limit; Although be described in detail the utility model with reference to preferred embodiment, those of ordinary skill in the field have been to be understood that: still can modify to embodiment of the present utility model or carry out equivalent replacement to portion of techniques feature; And not departing from the spirit of technical solutions of the utility model, it all should be encompassed in the middle of the technological scheme scope of the utility model request protection.
Claims (13)
1. a meta minus flow valve, it is characterized in that: comprise variable throttle valve (6), the inlet of described variable throttle valve (6) is provided with reverse feedback mouth (7), described variable throttle valve (6) inside forms throttling groove (61), described variable throttle valve (6) is provided with pilot pressure control end (62), described pilot pressure control end (62) is connected to pilot control oil circuit (d), for controlling the through-flow aperture of described throttling groove (61), to regulate the import and export difference in flow of described variable throttle valve (6), described reverse feedback mouth (7) can form reverse feedback pressure signal according to the import and export difference in flow of described variable throttle valve (6).
2. meta minus flow valve as claimed in claim 1, is characterized in that: also comprise relief valve (5), and described variable throttle valve (6) and described relief valve (5) are connected in parallel.
3. meta minus flow valve as claimed in claim 1, it is characterized in that: described variable throttle valve (6) comprises throttle valve body (63), throttling valve core (64) and throttle valve spring (65) is provided with in described throttle valve body (63), the end of described throttle valve body (63) is provided with throttle valve plug (66), described throttling groove (61) is formed between described throttling valve core (64) and described throttle valve body (63), described pilot pressure control end (62) comprises the pilot pressure control chamber formed between described throttling valve core (64) and described throttle valve plug (66), also comprise the pilot pressure through hole of the upper described pilot pressure control chamber of connection arranged of described throttle valve plug (66), the different oil pressure provided by described pilot pressure control end (62) can promote described throttling valve core (64) to-and-fro motion, area is communicated with what regulate the outlet of described throttling groove (61) and described variable throttle valve (6).
4. meta minus flow valve as claimed in claim 3, it is characterized in that: also form oil suction chamber (67) between described throttling valve core (64) and described throttle valve body (63), described throttling groove (61) is communicated with the import of described variable throttle valve (6) by described oil suction chamber (67).
5. a swing arm energy-saving control system, it is characterized in that: comprise main pump, multiple directional control valve (1), boom cylinder (3) and the meta minus flow valve as described in any one of claim 1-4, described main pump is connected to described multiple directional control valve (1), described multiple directional control valve (1) is connected to described boom cylinder (3) and described meta minus flow valve, and the reverse feedback pressure signal formed in described meta minus flow valve is for regulating described main pump delivery.
6. swing arm energy-saving control system as claimed in claim 5, it is characterized in that: described multiple directional control valve (1) comprises hoist pilot control end (11) and whereabouts pilot control end (12) for controlling swing arm whereabouts that hoist for controlling swing arm, and described whereabouts pilot control end (12) is connected to the pilot pressure control end (62) of described variable throttle valve (6).
7. swing arm energy-saving control system as claimed in claim 6, it is characterized in that: described multiple directional control valve (1) at least comprises meta, the first working position and the second working position, at meta, described multiple directional control valve (1) is communicated with described meta minus flow valve, at the first working position and the second working position, described multiple directional control valve (1) is all communicated with described boom cylinder (3), be respectively used to the whereabouts and the vertical motion that realize swing arm, wherein, in swing arm dropping process, meta and first working position of described multiple directional control valve (1) work simultaneously.
8. swing arm energy-saving control system as claimed in claim 7, it is characterized in that: the first actuator port of described multiple directional control valve (1) is communicated with described meta minus flow valve, second actuator port and the 3rd actuator port of described multiple directional control valve (1) are communicated with rodless cavity and the rod chamber of described boom cylinder (3) respectively, first filler opening of described multiple directional control valve (1) is communicated with described main pump with the second filler opening, and the return opening of described multiple directional control valve (1) is communicated with fuel tank.
9. swing arm energy-saving control system as claimed in claim 8, it is characterized in that: described multiple directional control valve (1) is at meta, first filler opening of described multiple directional control valve (1) is communicated with the first actuator port, second filler opening, return opening, second actuator port and the 3rd actuator port all end, described multiple directional control valve (1) is at the first working position, first filler opening of described multiple directional control valve (1) and the cut-off of the first actuator port, second filler opening is communicated with the 3rd actuator port, second actuator port is communicated with return opening, described multiple directional control valve (1) is at the second working position, first filler opening of described multiple directional control valve (1) and the cut-off of the first actuator port, second filler opening is communicated with the second actuator port, 3rd actuator port is communicated with return opening.
10. swing arm energy-saving control system as claimed in claim 9, it is characterized in that: described multiple directional control valve (1) is at the first working position, second filler opening of described multiple directional control valve (1) is also connected a branch road with the oil circuit between the 3rd actuator port, described branch road is also communicated with the oil circuit between return opening with the second actuator port of described multiple directional control valve (1), and described branch road is provided with one-way valve, the filler opening of described one-way valve is communicated with the oil circuit between the second actuator port of described multiple directional control valve (1) and return opening.
11. swing arm energy-saving control systems as claimed in claim 8, it is characterized in that: the oil circuit that the second actuator port of described multiple directional control valve (1) is communicated with the rodless cavity of described boom cylinder (3) is provided with luffing jib maintaining valve (2), and described luffing jib maintaining valve (2) is for controlling the break-make of oil circuit between the second actuator port of described multiple directional control valve (1) and the rodless cavity of described boom cylinder (3).
12. swing arm energy-saving control systems as claimed in claim 11, it is characterized in that: described luffing jib maintaining valve (2) comprises cartridge valve (21) and pilot slide valve (22), when the guide of described pilot slide valve (22) holds without pilot pressure, the spring chamber being communicated with described cartridge valve (21) without spring chamber by described pilot slide valve (22) of described cartridge valve (21), described cartridge valve (21) is closed, and the oil circuit between the second actuator port of described multiple directional control valve (1) and the rodless cavity of described boom cylinder (3) disconnects; When the guide of described pilot slide valve (22) holds and has pilot pressure, the spring chamber of described cartridge valve (21) is communicated with fuel tank by described pilot slide valve (22), described cartridge valve (21) is opened, and the oil circuit between the second actuator port of described multiple directional control valve (1) and the rodless cavity of described boom cylinder (3) is communicated with.
13. 1 kinds of excavators, is characterized in that: comprise the swing arm energy-saving control system as described in any one of claim 5-12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520881567.4U CN205207311U (en) | 2015-11-06 | 2015-11-06 | Meso position burden flow valve, swing arm energy -saving control system and excavator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520881567.4U CN205207311U (en) | 2015-11-06 | 2015-11-06 | Meso position burden flow valve, swing arm energy -saving control system and excavator |
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| CN205207311U true CN205207311U (en) | 2016-05-04 |
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| CN201520881567.4U Active CN205207311U (en) | 2015-11-06 | 2015-11-06 | Meso position burden flow valve, swing arm energy -saving control system and excavator |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106351277A (en) * | 2016-11-04 | 2017-01-25 | 山东常林机械集团股份有限公司 | Energy-saving excavator movable arm potential energy recycling device |
| CN106678110A (en) * | 2015-11-06 | 2017-05-17 | 徐工集团工程机械股份有限公司 | Meso-position negative flow valve, swing arm energy-saving control system and excavator |
| CN107337092A (en) * | 2017-07-13 | 2017-11-10 | 湖南人文科技学院 | A kind of crane oil pressure control circuit and its method |
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2015
- 2015-11-06 CN CN201520881567.4U patent/CN205207311U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106678110A (en) * | 2015-11-06 | 2017-05-17 | 徐工集团工程机械股份有限公司 | Meso-position negative flow valve, swing arm energy-saving control system and excavator |
| CN106351277A (en) * | 2016-11-04 | 2017-01-25 | 山东常林机械集团股份有限公司 | Energy-saving excavator movable arm potential energy recycling device |
| CN107337092A (en) * | 2017-07-13 | 2017-11-10 | 湖南人文科技学院 | A kind of crane oil pressure control circuit and its method |
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