CN204572611U - A kind of novel swing arm unloading valve - Google Patents
A kind of novel swing arm unloading valve Download PDFInfo
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- CN204572611U CN204572611U CN201520229825.0U CN201520229825U CN204572611U CN 204572611 U CN204572611 U CN 204572611U CN 201520229825 U CN201520229825 U CN 201520229825U CN 204572611 U CN204572611 U CN 204572611U
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Abstract
The utility model discloses a kind of novel swing arm unloading valve, comprise 2/2-way selector valve, 2/2-way selector valve is connected with current stabilizer, flow value and the boom cylinder rodless cavity fluid unloading rate value of current stabilizer are consistent, 2/2-way selector valve is also connected with the F mouth of swing arm unloading valve, current stabilizer is connected with the first one-way valve, first one-way valve is connected with the G mouth of swing arm unloading valve, the G mouth of swing arm unloading valve is connected with fuel tank, second one-way valve one end is connected with the E mouth of swing arm unloading valve, the other end is connected with the pipeline between the first one-way valve and current stabilizer, and the cracking pressure of the first one-way valve is greater than the cracking pressure of the second one-way valve.The utility model operating method is simple, and decline maximum speed is controlled, and not by the impact of the factors such as swing arm posture, load and angle; Do not affect by complete machine hydraulic system mode, hydraulic control hydraulic system, electric proportional hydraulic system all can use this valve to reach the target of anticipation.
Description
Technical field
The utility model belongs to swing arm off-load technical field, is specifically related to a kind of novel swing arm unloading valve.
Background technique
Not work or in transportation process in the digging machine normal time, can automatically decline in the air if swing arm exists for a long time, to people and the raw uncertain risk of produce of surrounding, in order to increase the stability of complete machine, avoid letting out in boom cylinder simultaneously, swing arm can be declined is positioned on ground or a stationary device, as shown in Figure 1.And in order to ensure complete machine stability, enlarge active surface, make its crawler belt and the whole kiss the earth of swing arm or device, common way is under the manipulation of operator, swing arm is dropped on ground or device under the effect of hydraulic system, make it contact completely with ground or device, or use swing arm regeneration valve by Joystick, swing arm to be declined under gravity automatically.
In order to avoid when placing, swing arm causes unnecessary destruction to ground or device, this action had better not be completed under hydraulic system effect, because time when operator are contacted with ground or device less than swing arm by handle impression in hydraulic system operation process, fall hourly velocity under gravity also should not be too fast simultaneously, otherwise, it will affect complete machine stability, under gravity and speed effect, also can destroy ground or device.
The action command of swing arm regeneration valve is performed by hydraulic control pilot handle, does not have hydraulic control pilot handle in electric proportional control digging machine, and this swing arm regeneration valve cannot be applied; Simultaneously, when using in the digging machine having hydraulic control pilot system, because the principle that realizes of regeneration valve is throttle valve control, and throttle valve is to the control inaccuracy of flow, and can change according to the change of load, so swing arm puts posture, swing arm carry load, swing arm are different from the angle on ground, capital causes the change of lowering velocity, when lowering velocity is excessive, swing arm contacts with ground or device, can make the destruction that ground or device suffer in various degree under gravity.
In order to solve the problem, two kinds of methods of prior art are respectively operator's Joystick makes swing arm drop to ground under the effect of complete machine hydraulic system; Another kind method is that the action of swing arm regeneration valve makes swing arm drop to ground under gravity.Simply introduce the using process of each method and the shortcoming of existence respectively below.
As shown in Figure 2, this hydraulic system is that digging machine boom cylinder handles schematic diagram.Handle is pulled in pilot handle 1 left and right under the manipulation of operator, handles pilot operated directional control valve 4 and moves to right position or left position, make the high pressure oil of Variable plunger pump 5 enter two boom cylinders, realize decline or the rising of swing arm.
When digging machine does not work, swing arm need be transferred, it is as follows that it realizes principle: operator's Joystick 4 to a position, make the oil of P mouth pilot pressure in pilot handle 4 by a effect to the right side of pilot operated directional control valve 8, overcome the spring force on the left of pilot operated directional control valve 8, spool is moved to the left, loculus and the rod chamber of the outlet high pressure oil of Variable plunger pump 9 and boom cylinder 6 and boom cylinder 7 communicate, pressure oil constantly enters oil cylinder loculus, large chamber fluid flows to fuel tank by pilot operated directional control valve 8, boom cylinder 6 and boom cylinder 7 synchronously bounce back under the effect of boom structure part, swing arm is driven to rotate the upper surface of the swing arm parking device 1 gradually in ground or Fig. 1.
This maneuverability pattern, by the intrinsic hydraulic system functional realiey of complete machine, additionally do not increase cost, but the effect reached is often unsatisfactory.Its shortcoming is: (1) is when near ground, too early shut-down operation handle, can make swing arm can not kiss the earth completely, cross late shut-down operation handle, under the effect of hydraulic system, swing arm can produce ground and destroy because the load of operator's stick control moment and swing arm it doesn't matter, namely operator experience less than the change of swing arm load; In order to not impact ground, requirements at the higher level be proposed to the operant level of operator, requires also higher to complete machine hydraulic system fretting performance simultaneously, before swing arm kiss the earth in a flash, speed can not be too fast, otherwise should not produce a desired effect, and also likely causes complete machine to rock.(2) operator are when putting down swing arm, and because environmental conditions is complicated, weather and digging machine swing arm peripheral obstacle may affect the sight line of operator, make it can't see the point of contact of swing arm and ground or device, cause transferring too much or not enough, effect extreme difference.
As shown in Figure 3, swing arm regeneration valve is a hydraulic control proportional reversing valve, and A mouth is connected with the large chamber of boom cylinder, B is connected with the loculus of boom cylinder, C mouth is connected with fuel tank, and D mouth is connected with hydraulic control pilot handle, and the spring force in left side and the hydraulic control pilot pressure range of D mouth match.
When operator do not operate the pilot handle be connected with D mouth, D mouth oil circuit is connected with fuel tank, and pressure is zero, swing arm regeneration valve is placed in left position under the effect of left pressure, and as shown in Figure 3, A mouth, B mouth and C mouth are not connected, boom cylinder both sides oil circuit is closed, and swing arm keeps motionless, when after manipulation pilot handle to several angle, the pressure oil of guide's oil circuit can act on the D mouth of swing arm regeneration valve, when the product value of pilot pressure and active area is greater than the spring force in left side, regeneration valve spool is a mobile segment distance to the left, until A mouth, B mouth and C mouth are interconnected, now because the pressure that makes fluid flow under the effect of swing arm gravity to be connected with fuel tank with the A mouth that boom cylinder cavity of resorption is communicated with is lower than the C mouth of A mouth and effluent oil sump tank, oil cylinder cavity of resorption fluid reduces, swing arm declines, cylinder upper cavity oil volume increases, because there is no initiatively slippage pump, epicoele will produce negative pressure, by the B mouth of swing arm regeneration valve from the oil suction of A mouth.In boom cylinder retraction process, the fluid that the fluid that large chamber is flowed out supplements much larger than loculus demand, so, some fluid total flows back to fuel tank, namely when swing arm regeneration valve works, the oil-feed of regeneration valve A mouth, B mouth and C mouth are fuel-displaced, are transferred by swing arm on ground or fixing device smoothly.
Although swing arm regeneration valve reaches the object fallen under gravity, but still there is following shortcoming:
(1) speed is uncontrollable.When swing arm regeneration valve is opened, in order to anti-stopper lever declines rapidly under gravity, an orifice plug is installed near A mouth, shown in position as right in Fig. 3 regeneration valve, large chamber fluid is subject to throttling action, and rate of descent can reduce, but still can be subject to the impact of swing arm angle, swing arm load and swing arm height, namely speed is uncontrollable, when orifice plug size is constant, load is larger, and the speed of decline is larger, so, envision a certain distance in addition with swing arm whereabouts effect.
(2) oil cylinder loculus easily produces and inhales sky.In regeneration valve working procedure, oil cylinder loculus is passive repairing, and loculus volume increases the fluid producing vacuum suction and flow out from A mouth and large chamber, cannot ensure the validity of its repairing, easily occur emptying phenomenon, have a negative impact to complete machine hydraulic system.
(3) automatically controlled digging machine cannot use this swing arm regeneration valve.The commutation of this regeneration valve is realized by guide's hydraulic control handle, when digging machine operation system is electric proportional control, especially in recent years, the Requirement and development trend of remote control digging machine is obvious, complete machine does not have pilot control system, just cannot use this regeneration valve, is difficult to the object reaching anticipation.
Summary of the invention
For solving the problem, the utility model provides a kind of novel swing arm unloading valve, can not only make up the deficiency that existing regeneration valve exists, not increase cost again, under not increasing the prerequisite of the labor intensity of operator, reach the target of anticipation.
The purpose of this utility model realizes in the following manner:
A kind of novel swing arm unloading valve, comprise 2/2-way selector valve, 2/2-way selector valve is connected with current stabilizer, flow value and the boom cylinder rodless cavity fluid unloading rate value of current stabilizer are consistent, 2/2-way selector valve is also connected with the F mouth of swing arm unloading valve, current stabilizer is connected with the first one-way valve, first one-way valve is connected with the G mouth of swing arm unloading valve, the G mouth of swing arm unloading valve is connected with fuel tank, second one-way valve one end is connected with the E mouth of swing arm unloading valve, the other end is connected with the pipeline between the first one-way valve and current stabilizer, and the cracking pressure of the first one-way valve is greater than the cracking pressure of the second one-way valve.The F mouth of swing arm unloading valve is connected with the rodless cavity of left boom cylinder and right boom cylinder, and the E mouth of swing arm unloading valve is connected with the rod chamber of left boom cylinder and right boom cylinder.
Described first one-way valve is return oil pressure valve, and the second one-way valve is repairing one-way valve.
Described 2/2-way selector valve is electric ratio 2/2-way selector valve or hydraulic control 2/2-way selector valve.
Relative to prior art, the beneficial effects of the utility model are:
(1) operating method is simple, only need handle a solenoid valve button and swing arm can be made to transfer under gravity above original target;
(2) decline maximum speed is controlled, and not by the impact of the factors such as swing arm posture, load and angle;
(3) do not affect by complete machine hydraulic system mode, hydraulic control hydraulic system, electric proportional hydraulic system all can use this valve to reach the target of anticipation;
(4) when engine stoping operation, unloading valve still can normally use, and uses flexibly.
Accompanying drawing explanation
Fig. 1 is the structural representation of digging machine parked state.
Fig. 2 handles swing arm to transfer schematic diagram.
Fig. 3 is swing arm regeneration valve schematic diagram.
Fig. 4 is schematic diagram of the present utility model.
Fig. 5 is job applications schematic diagram of the present utility model.
Wherein, 1 is swing arm parking device; 2 is swing arms; 3 is boom cylinders; 4 is digging machine chassis; 5 is pilot handles; 6 is left boom cylinders; 7 is right boom cylinders; 8 is pilot operated directional control valves; 9 is Variable plunger pumps; 10 is oil absorption filters; 11 is fuel tanks; 12 is first one-way valves; 13 is current stabilizers; 14 is second one-way valves; 15 is 2/2-way selector valves; 16 is electro-hydraulic proportion reversing valves.
Embodiment
As shown in accompanying drawing 4-5, a kind of novel swing arm unloading valve, comprise 2/2-way selector valve 15, 2/2-way selector valve 15 is connected with current stabilizer 13, flow value and the boom cylinder rodless cavity fluid unloading rate value of current stabilizer 13 are consistent, 2/2-way selector valve 15 is also connected with the F mouth of swing arm unloading valve, current stabilizer 13 is connected with the first one-way valve 12, first one-way valve 12 is connected with the G mouth of swing arm unloading valve, the G mouth of swing arm unloading valve is connected with fuel tank 11, second one-way valve 14 one end is connected with the E mouth of swing arm unloading valve, the other end is connected with the pipeline between the first one-way valve 12 and current stabilizer 13, and the cracking pressure of the first one-way valve 12 is greater than the cracking pressure of the second one-way valve 14.The F mouth of swing arm unloading valve is connected with the rodless cavity of left boom cylinder 6 and right boom cylinder 7, and the E mouth of swing arm unloading valve is connected with the rod chamber of left boom cylinder 6 and right boom cylinder 7.
Described first one-way valve 12 is return oil pressure valve, and the second one-way valve 14 is repairing one-way valve.
Described 2/2-way selector valve 15 is electric ratio 2/2-way selector valve or hydraulic control 2/2-way selector valve.
The flow value that current stabilizer 13 sets is the maximum speed value of boom cylinder rodless cavity fluid off-load, and can choose this numerical value according to the actual demand adjustment of different digging machine, namely regardless of swing arm in what state, the top speed that swing arm declines is no more than this flow value; 2/2-way selector valve 15 is Proportional valve, gives different current values, and the opening degree size of valve is just different, can realize controlling the flow value by this valve, namely be less than arbitrary numerical value of current stabilizer 13 setting value.
The each hydraulic fluid port of boom cylinder unloading valve connects operation instruction: F mouth connects the rodless cavity of boom cylinder, and E mouth connects the rod chamber of boom cylinder, i.e. unidirectional repairing oil circuit, and G mouth connects fuel tank 11.
The handling characteristics of the first one-way valve 12 and the second one-way valve 14: the cracking pressure set because of two valves is different, namely the first one-way valve 12 setting value is higher than the second one-way valve 14, the fluid preferential flow at the h place namely shown in Fig. 4 is to being h-the second one-way valve 14-E mouth-cylinder rod chamber oil circuit, after force value rises to the setting value of the first one-way valve 12, fluid just can pass through h-the first one-way valve 12-G mouth-tank oiling channel oil; Fuel tank 11 inner fluid cannot flow to rod chamber and the rodless cavity of boom cylinder under the effect of the first one-way valve 12; Boom cylinder rod chamber inner fluid cannot flow to rodless cavity and the fuel tank 11 of boom cylinder under the effect of the second one-way valve 14.
As shown in Figure 5, the application principle figure of boom cylinder unloading valve in digging machine boom cylinder hydraulic system, E mouth, the F mouth of swing arm unloading valve are connected with rodless cavity with the rod chamber of boom cylinder respectively, and G mouth and fuel tank 11 are connected.Digging machine swing arm operationally provides pressure oil by Variable plunger pump 9, the rise and fall of oil cylinder are realized by electro-hydraulic proportion reversing valve 16, on the left of electro-hydraulic proportion reversing valve 16, solenoid valve obtains electric, the pressure oil that Variable plunger pump 9 exports enters the rodless cavity of left boom cylinder 6 and right boom cylinder 7 by electro-hydraulic proportion reversing valve 16, and swing arm rises; Return it, boom cylinder bounces back, and swing arm declines.
Complete machine after the utility model boom cylinder unloading valve being arranged on digging machine swing arm oil circuit below does in various using state and illustrates one by one:
(1) Variable plunger pump 9 starts, electro-hydraulic proportion reversing valve 16 side obtains electric---digging machine working state;
(2) electro-hydraulic proportion reversing valve 16 must not be electric, and the 2/2-way selector valve 15 in boom cylinder unloading valve is charged---park machine state;
(3) Variable plunger pump 9 unstart, electro-hydraulic proportion reversing valve 16 and 2/2-way selector valve 15 all must not electricity---transport or outage states.
Working procedure of the present utility model is as follows: when digging machine work completes or climb up transport vehicle preparation shutdown, Variable plunger pump 9 stops operating, electro-hydraulic proportion reversing valve 16 must not electricity when, 2/2-way selector valve 15 is obtained electric, in valve, F to h oil circuit is connected, left boom cylinder 6 and right boom cylinder 7 rodless cavity inner fluid are subject to extruding under the effect of whole swing arm gravity, because F to h oil circuit is connected, rodless cavity internal pressure oil flow to the top of current stabilizer 13, because current stabilizer 13 own characteristic is for be no more than maximum setting flow (this numerical value can set as required) by its peak rate of flow, the maximum retraction speed of boom cylinder is restricted, simultaneously because 2/2-way selector valve 15 input signal is scaling signal, by inputting its openings of sizes of different controlled current flow systems, the flow (its flow is less than the setting value of current stabilizer 13) by 2/2-way selector valve 15 can be controlled, namely by the speed that the current value control swing arm of control inputs 2/2-way selector valve 15 declines, the impact of performance of fine motion is reached.
Occur two oil circuits when the oil return of boom cylinder rodless cavity flow to h place, one is 1. h-the first one-way valve 12-G mouth-tank oiling channel oil, and another one is 2. h-the second one-way valve 14-E mouth-boom cylinder rod chamber oil circuit.An one-way valve is all had in two oil circuits, but because of oil circuit 1. in the cracking pressure of the first one-way valve 12 be greater than loop 2. in the cracking pressure of the second one-way valve 14, so from the oil return preferential flow of oil cylinder rodless cavity to oil circuit 2., when pressure in oil circuit reaches the cracking pressure of the first one-way valve 12, oil circuit 1. in fluid could circulate, so this is designed to the repairing preferentially meeting two boom cylinder rod chambers, avoid the appearance of emptying phenomenon.
Relative to prior art, the beneficial effects of the utility model are:
(1) operating method is simple, only need handle a solenoid valve button and swing arm can be made to transfer under gravity above original target;
(2) decline maximum speed is controlled, and not by the impact of the factors such as swing arm posture, load and angle;
(3) do not affect by complete machine hydraulic system mode, hydraulic control hydraulic system, electric proportional hydraulic system all can use this valve to reach the target of anticipation;
(4) when engine stoping operation, unloading valve still can normally use, and uses flexibly.
Above-described is only preferred implementation of the present utility model; it should be pointed out that for a person skilled in the art, do not departing under the utility model general idea prerequisite; can also make some changes and improvements, these also should be considered as protection domain of the present utility model.
Claims (3)
1. a novel swing arm unloading valve, it is characterized in that: comprise 2/2-way selector valve (15), 2/2-way selector valve (15) is connected with current stabilizer (13), flow value and the boom cylinder rodless cavity fluid unloading rate value of current stabilizer (13) are consistent, 2/2-way selector valve (15) is also connected with the F mouth of swing arm unloading valve, current stabilizer (13) is connected with the first one-way valve (12), first one-way valve (12) is connected with the G mouth of swing arm unloading valve, the G mouth of swing arm unloading valve is connected with fuel tank (11), second one-way valve (14) one end is connected with the E mouth of swing arm unloading valve, the other end is connected with the pipeline between the first one-way valve (12) and current stabilizer (13), and the cracking pressure of the first one-way valve (12) is greater than the cracking pressure of the second one-way valve (14).
2. novel swing arm unloading valve according to claim 1, is characterized in that: described first one-way valve (12) is return oil pressure valve, and the second one-way valve (14) is repairing one-way valve.
3. novel swing arm unloading valve according to claim 1, is characterized in that: described 2/2-way selector valve (15) is electric ratio 2/2-way selector valve or hydraulic control 2/2-way selector valve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520229825.0U CN204572611U (en) | 2015-04-16 | 2015-04-16 | A kind of novel swing arm unloading valve |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520229825.0U CN204572611U (en) | 2015-04-16 | 2015-04-16 | A kind of novel swing arm unloading valve |
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| CN204572611U true CN204572611U (en) | 2015-08-19 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105525641A (en) * | 2016-01-25 | 2016-04-27 | 徐州徐工特种工程机械有限公司 | Movable arm dropping hydraulic system used for skid steer loader in case of flameout |
| CN105862962A (en) * | 2016-05-31 | 2016-08-17 | 青岛雷沃挖掘机有限公司 | Hydraulic circuit for reducing oil return backpressure |
| CN114754035A (en) * | 2022-05-16 | 2022-07-15 | 江苏谷登桩工科技有限公司 | Quick pile lifting electronic control system of static pile press and control method thereof |
-
2015
- 2015-04-16 CN CN201520229825.0U patent/CN204572611U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105525641A (en) * | 2016-01-25 | 2016-04-27 | 徐州徐工特种工程机械有限公司 | Movable arm dropping hydraulic system used for skid steer loader in case of flameout |
| CN105862962A (en) * | 2016-05-31 | 2016-08-17 | 青岛雷沃挖掘机有限公司 | Hydraulic circuit for reducing oil return backpressure |
| CN105862962B (en) * | 2016-05-31 | 2018-05-18 | 青岛雷沃工程机械有限公司 | Reduce the hydraulic circuit of return oil pressure |
| CN114754035A (en) * | 2022-05-16 | 2022-07-15 | 江苏谷登桩工科技有限公司 | Quick pile lifting electronic control system of static pile press and control method thereof |
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