CN203128081U - Hydraulic control system for suspension arm, and crane - Google Patents
Hydraulic control system for suspension arm, and crane Download PDFInfo
- Publication number
- CN203128081U CN203128081U CN 201320143546 CN201320143546U CN203128081U CN 203128081 U CN203128081 U CN 203128081U CN 201320143546 CN201320143546 CN 201320143546 CN 201320143546 U CN201320143546 U CN 201320143546U CN 203128081 U CN203128081 U CN 203128081U
- Authority
- CN
- China
- Prior art keywords
- valve
- change
- over valve
- chamber
- communicated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Fluid-Pressure Circuits (AREA)
Abstract
The utility model discloses a hydraulic control system for a suspension arm. The hydraulic control system comprises an oil tank, a hydraulic pump, a first reversing valve, a telescopic oil cylinder and a balance valve, wherein the first working oil port of the first reversing valve is connected with the rodless cavity of the telescopic oil cylinder via the balance valve; and the second working oil port of the first reversing valve is connected with the rod cavity of the telescopic oil cylinder. The hydraulic control system further comprises a cut-off control unit, wherein the cut-off control unit is connected to a pipeline between the rod cavity of the telescopic oil cylinder and the second working oil port of the first reversing valve; the control port of the balance valve is communicated with a pipeline between the cut-off control unit and the second working oil port of the first reversing valve; and when the first reversing valve is in a cut-off state, the pipeline between the rod cavity of the telescopic oil cylinder and the second working oil port of the first reversing valve is cut off by the cut-off control unit. The utility model further discloses a crane. The hydraulic control system is capable of avoiding the misoperations of the telescopic oil cylinder, which are brought by the leakage of the balance valve, and improving the safety and stability of the system.
Description
Technical field
The utility model relates to engineering machinery field, particularly, relates to a kind of hydraulic control system and hoisting crane of arm.
Background technology
Continuous development along with hoisting crane, the user is more and more higher to the requirement of the hoisting capacity of hoisting crane and lifting altitude, make design and the extension and contraction control mode of arm of hoisting crane require more and more higher, on the other hand, the operating mode that the hoisting crane user uses is more frequent and complicated, and safety and the stability of arm action are particularly important.
Be illustrated in figure 1 as the schematic diagram of hydraulic control system of the arm of prior art, this hydraulic control system comprises fuel tank 1, Hydraulic Pump 2, first change-over valve 3, telescopic oil cylinder 4 and balance cock 7, the oil suction of Hydraulic Pump 2 is communicated with fuel tank 1, the pressure hydraulic fluid port of Hydraulic Pump 2 is communicated with the oil inlet of first change-over valve 3, the return opening of first change-over valve 3 is communicated with fuel tank 1, first actuator port of first change-over valve 3 is connected with the rodless cavity of telescopic oil cylinder 4 by balance cock 7, second actuator port of first change-over valve 3 is connected with the rod chamber of telescopic oil cylinder 4, pipeline connection between second actuator port of the control mouth of balance cock 7 and the rod chamber of telescopic oil cylinder 4 and first change-over valve 3, the two ends of telescopic oil cylinder 4 are connected on two adjacent arm joints of arm by pin.When first change-over valve 3 is in position, a left side, the rodless cavity oil-feed of telescopic oil cylinder 4, the piston rod of telescopic oil cylinder 4 stretches out, and makes arm launch; When first change-over valve 3 is in right position, the rod chamber oil-feed of telescopic oil cylinder 4, the piston rod withdrawal of telescopic oil cylinder 4 makes arm pack up; When first change-over valve 3 was in meta, telescopic oil cylinder 4 was failure to actuate, and arm keeps original movement posture.
Existing hoisting crane is in operation process or during Suspend Job, when first change-over valve 3 is in meta and makes that arm keeps original movement posture, telescopic oil cylinder 4 relies on balance cock 7 to pin, if balance cock 7 leaks, the rodless cavity of telescopic oil cylinder 4 is communicated with rod chamber by balance cock 7 and first change-over valve 3, under the external force effect that puts on arm, can cause the interior fluid of rodless cavity of telescopic oil cylinder 4 to pass through balance cock 7, pipeline between second actuator port of the rod chamber of first change-over valve 3 and telescopic oil cylinder 4 and first change-over valve 3 flows in the rod chamber of telescopic oil cylinder 4, and then telescopic oil cylinder 4 generation misoperations, bring various potential safety hazards and accident.
The utility model content
The purpose of this utility model provides a kind of hydraulic control system and hoisting crane of arm, the misoperation that this hydraulic control system can avoid balance cock to leak the telescopic oil cylinder that brings, safety and the stability of raising system.
To achieve these goals, one side of the present utility model provides a kind of hydraulic control system of arm, this hydraulic control system comprises fuel tank, Hydraulic Pump, first change-over valve, telescopic oil cylinder and balance cock, the oil suction of described Hydraulic Pump is communicated with described fuel tank, the pressure hydraulic fluid port of described Hydraulic Pump is communicated with the oil inlet of described first change-over valve, the return opening of described first change-over valve is communicated with described fuel tank, first actuator port of described first change-over valve is connected with the rodless cavity of described telescopic oil cylinder by described balance cock, second actuator port of described first change-over valve is connected with the rod chamber of described telescopic oil cylinder, wherein, described hydraulic control system also comprises by control unit, should be on control unit be connected pipeline between second actuator port of the rod chamber of described telescopic oil cylinder and described first change-over valve, the control mouth of described balance cock and described pipeline connection between second actuator port of control unit and described first change-over valve, when described first change-over valve is in off condition, describedly pipeline between second actuator port of the rod chamber of described telescopic oil cylinder and described first change-over valve can be blocked by control unit.
Preferably, the described control unit that ends comprises two-way plug-in valve and second change-over valve, first chamber of described two-way plug-in valve is communicated with the rod chamber of described telescopic oil cylinder, second chamber of described two-way plug-in valve is communicated with second actuator port of described first change-over valve, the oil inlet of described second change-over valve is communicated with first chamber of described two-way plug-in valve, the return opening of described second change-over valve is communicated with described fuel tank, and the actuator port of described second change-over valve is communicated with the control chamber of described two-way plug-in valve.
Preferably, the described control unit that ends comprises two-way plug-in valve and second change-over valve, first chamber of described two-way plug-in valve is communicated with the rod chamber of described telescopic oil cylinder, second chamber of described two-way plug-in valve is communicated with second actuator port of described first change-over valve, pipeline connection between second chamber of the oil inlet of described second change-over valve and described two-way plug-in valve and second actuator port of described first change-over valve, the return opening of described second change-over valve is communicated with described fuel tank, and the actuator port of described second change-over valve is communicated with the control chamber of described two-way plug-in valve.
Preferably, the described control unit that ends comprises two-way plug-in valve, second change-over valve and shuttle valve, first chamber of described two-way plug-in valve is communicated with the rod chamber of described telescopic oil cylinder, second chamber of described two-way plug-in valve is communicated with second actuator port of described first change-over valve, first chamber of described two-way plug-in valve is communicated with first oil inlet of described shuttle valve, pipeline connection between second actuator port of second oil inlet of described shuttle valve and second chamber of described two-way plug-in valve and described first change-over valve, the oil outlet of described shuttle valve is communicated with the oil inlet of described second change-over valve, the return opening of described second change-over valve is communicated with described fuel tank, and the actuator port of described second change-over valve is communicated with the control chamber of described two-way plug-in valve.
Preferably, described second change-over valve is solenoid directional control valve.
Preferably, described hydraulic control system also comprises first by pass valve, the oil inlet of this first by pass valve and described pipeline connection between the rod chamber of control unit and described telescopic oil cylinder, the oil outlet of described first by pass valve and described pipeline connection between second actuator port of control unit and described first change-over valve.
Preferably, described hydraulic control system also comprises second by pass valve, pipeline connection between the oil inlet of the oil inlet of this second by pass valve and the oil outlet of described Hydraulic Pump and described first change-over valve, the pipeline connection between the return opening of the oil outlet of described second by pass valve and described fuel tank and described first change-over valve.
Of the present utility modelly provide a kind of hoisting crane on the other hand, this hoisting crane comprises the hydraulic control system of arm and arm, the hydraulic control system of described arm can be controlled the action of described arm, and wherein, the hydraulic control system of described arm is the hydraulic control system of arm recited above.
Pass through technique scheme, because the hydraulic control system of arm of the present utility model pipeline between second actuator port of the rod chamber of telescopic oil cylinder and first change-over valve is provided with by control unit, when first change-over valve is in off condition, namely first change-over valve is in meta, arm is in floating state, pipeline between second actuator port of the rod chamber of telescopic oil cylinder and first change-over valve can be blocked by control unit, make rod chamber and the rodless cavity of telescopic oil cylinder keep neither oil-feed also not fuel-displaced, thereby misoperation can not take place in telescopic oil cylinder under the situation that balance cock takes place to leak, the Stability Analysis of Structures that keeps arm, safety and the stability of raising system.When first change-over valve is in conducting state, namely first change-over valve is in position, a left side or right position, arm is in flexible mode of operation, by the control unit conducting, make pipeline connection between second actuator port of the rod chamber of telescopic oil cylinder and first change-over valve, the rod chamber of telescopic oil cylinder and rodless cavity be oil-feed and oil return normally, the hydraulic control system normal operation.
Other feature and advantage of the present utility model will partly be described in detail in the specific embodiment subsequently.
Description of drawings
Accompanying drawing is to be used to provide further understanding of the present utility model, and constitutes the part of specification sheets, is used from explanation the utility model with the following specific embodiment one, but does not constitute restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the schematic diagram of hydraulic control system of the arm of prior art;
Fig. 2 is the schematic diagram of hydraulic control system of the arm of first embodiment of the present utility model;
Fig. 3 is the schematic diagram of hydraulic control system of the arm of second embodiment of the present utility model;
Fig. 4 is the schematic diagram of hydraulic control system of the arm of the 3rd embodiment of the present utility model;
Fig. 5 is the schematic diagram of hydraulic control system of the arm of the 4th embodiment of the present utility model.
Description of reference numerals
1 fuel tank, 2 Hydraulic Pumps
3 first change-over valves, 4 telescopic oil cylinders
5 by control unit 6 first by pass valves
7 balance cocks, 8 second by pass valves
51 two-way plug-in valves, 52 second change-over valves
53 shuttle valves
The specific embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present utility model is elaborated.Should be understood that the specific embodiment described herein only is used for description and interpretation the utility model, is not limited to the utility model.
As Fig. 2-shown in Figure 5, one side of the present utility model provides a kind of hydraulic control system of arm, this hydraulic control system comprises fuel tank 1, Hydraulic Pump 2, first change-over valve 3, telescopic oil cylinder 4 and balance cock 7, the oil suction of described Hydraulic Pump 2 is communicated with described fuel tank 1, the pressure hydraulic fluid port of described Hydraulic Pump 2 is communicated with the oil inlet of described first change-over valve 3, the return opening of described first change-over valve 3 is communicated with described fuel tank 1, first actuator port of described first change-over valve 3 is connected with the rodless cavity of described telescopic oil cylinder 4 by described balance cock 7, second actuator port of described first change-over valve 3 is connected with the rod chamber of described telescopic oil cylinder 4, wherein, described hydraulic control system also comprises by control unit 5, should be on control unit 5 be connected pipeline between second actuator port of the rod chamber of described telescopic oil cylinder 4 and described first change-over valve 3, the control mouth of described balance cock 7 and described pipeline connection between second actuator port of control unit 5 and described first change-over valve 3, when described first change-over valve 3 is in off condition, describedly pipeline between second actuator port of the rod chamber of described telescopic oil cylinder 4 and described first change-over valve 3 can be blocked by control unit 5.
Because the hydraulic control system of arm of the present utility model pipeline between second actuator port of the rod chamber of telescopic oil cylinder 4 and first change-over valve 3 is provided with by control unit 5, when first change-over valve 3 is in off condition, namely first change-over valve 3 is in meta, arm is in floating state, pipeline between second actuator port of the rod chamber of telescopic oil cylinder 4 and first change-over valve 3 can be blocked by control unit 5, make rod chamber and the rodless cavity of telescopic oil cylinder 4 keep neither oil-feed also not fuel-displaced, thereby misoperation can not take place in telescopic oil cylinder 4 under the situation that balance cock 7 takes place to leak, the Stability Analysis of Structures that keeps arm, safety and the stability of raising system.When first change-over valve 3 is in conducting state, namely first change-over valve 3 is in position, a left side or right position, arm is in flexible mode of operation, by control unit 5 conductings, make pipeline connection between second actuator port of the rod chamber of telescopic oil cylinder 4 and first change-over valve 3, the rod chamber of telescopic oil cylinder 4 and rodless cavity be oil-feed and oil return normally, the hydraulic control system normal operation.
As Fig. 2-shown in Figure 5, for stationarity and the safety that guarantees hydraulic control system work, balance cock 7 is connected on the pipeline between the rodless cavity of first actuator port of described first change-over valve 3 and described telescopic oil cylinder 4, the control mouth of described balance cock 7 and described pipeline connection between second actuator port of control unit 5 and described first change-over valve 3.Balance cock 7 can be controlled the stretching speed of the piston rod of telescopic oil cylinder 4, thereby the stretching speed of control arm is steadily worked safely to guarantee arm.In addition, under the situation of system's rapid decompression, balance cock 7 can avoid the piston rod of telescopic oil cylinder 4 to withdraw suddenly, prevents the generation of the safety misadventure that the unexpected retraction of arm causes.
Be illustrated in figure 2 as the hydraulic control system of the arm of first embodiment of the present utility model, as a kind of preferred implementation by control unit 5, the described control unit 5 that ends comprises two-way plug-in valve 51 and second change-over valve 52, first chamber of described two-way plug-in valve 51 is communicated with the rod chamber of described telescopic oil cylinder 4, second chamber of described two-way plug-in valve 51 is communicated with second actuator port of described first change-over valve 3, the oil inlet of described second change-over valve 52 is communicated with first chamber of described two-way plug-in valve 51, the return opening of described second change-over valve 52 is communicated with described fuel tank 1, and the actuator port of described second change-over valve 52 is communicated with the control chamber of described two-way plug-in valve 51.
When first change-over valve 3 is in meta, be that hydraulic control system is in readiness for action, second change-over valve 52 is in the working position (with reference to shown in Figure 2) of below, first chamber of two-way plug-in valve 51 can be communicated with the control chamber of two-way plug-in valve 51 by second change-over valve 52, be provided with spring in the control chamber of two-way plug-in valve 51, thereby the pressure of the fluid in the control chamber of two-way plug-in valve 51 and the elastic force combined action of spring, make the insertion element of two-way plug-in valve 51 stably be pressed against formation awl sealing on the valve pocket, two-way plug-in valve 51 is in closed condition, wherein not having any fluid flows through, be not communicated with between second actuator port of the rod chamber of telescopic oil cylinder 4 and first change-over valve 3, fluid when balance cock takes place to leak in the rod chamber of telescopic oil cylinder 4 also can not flow out or flow in the rod chamber by first change-over valve 3, misoperation can not take place in telescopic oil cylinder 4, guarantee the stability of boom structure, avoid the generation of safety misadventure.
When first change-over valve 3 is in position, a left side or right position, be that hydraulic control system is in running order, second change-over valve 52 is in the working position of top, the control chamber of two-way plug-in valve 51 is communicated with fuel tank 1 by second change-over valve 52, fluid in the control chamber of two-way plug-in valve 51 is back in the fuel tank 1, make the control chamber off-load, thereby the pressure of the fluid in first chamber of two-way plug-in valve 51 overcomes the elastic force effect of the spring in the control chamber, make the insertion element of two-way plug-in valve 51 move and not seal with valve pocket formation, first chamber of two-way plug-in valve 51 and second chamber are communicated with, two-way plug-in valve 51 is in conducting state, be communicated with between second actuator port of the rod chamber of telescopic oil cylinder 4 and first change-over valve 3, telescopic oil cylinder 4 oil-feed normally and oil return guarantee normal operation and the operation of hydraulic control system.
Be illustrated in figure 3 as the hydraulic control system of the arm of second embodiment of the present utility model, as the another kind of preferred implementation by control unit 5, the described control unit 5 that ends comprises two-way plug-in valve 51 and second change-over valve 52, first chamber of described two-way plug-in valve 51 is communicated with the rod chamber of described telescopic oil cylinder 4, second chamber of described two-way plug-in valve 51 is communicated with second actuator port of described first change-over valve 3, pipeline connection between second actuator port of second chamber of the oil inlet of described second change-over valve 52 and described two-way plug-in valve 51 and described first change-over valve 3, the return opening of described second change-over valve 52 is communicated with described fuel tank 1, and the actuator port of described second change-over valve 52 is communicated with the control chamber of described two-way plug-in valve 51.
When first change-over valve 3 is in meta, be that hydraulic control system is in readiness for action, second change-over valve 52 is in the working position (with reference to shown in Figure 3) of below, second chamber of two-way plug-in valve 51 can be communicated with the control chamber of two-way plug-in valve 51 by second change-over valve 52, be provided with spring in the control chamber of two-way plug-in valve 51, thereby the pressure of the fluid in the control chamber of two-way plug-in valve 51 and the elastic force combined action of spring, make the insertion element of two-way plug-in valve 51 stably be pressed against formation awl sealing on the valve pocket, two-way plug-in valve 51 is in closed condition, wherein not having any fluid flows through, be not communicated with between second actuator port of the rod chamber of telescopic oil cylinder 4 and first change-over valve 3, fluid when balance cock 7 takes place to leak in the rod chamber of telescopic oil cylinder 4 also can not flow out or flow in the rod chamber by first change-over valve 3, misoperation can not take place in telescopic oil cylinder 4, guarantee the stability of boom structure, avoid the generation of safety misadventure.
When first change-over valve 3 is in position, a left side or right position, be that hydraulic control system is in running order, second change-over valve 52 is in the working position of top, the control chamber of two-way plug-in valve 51 is communicated with fuel tank 1 by second change-over valve 52, fluid in the control chamber of two-way plug-in valve 51 is back in the fuel tank 1, make the control chamber off-load, thereby the pressure of the fluid in first chamber of two-way plug-in valve 51 overcomes the elastic force effect of the spring in the control chamber, make the insertion element of two-way plug-in valve 51 move and not seal with valve pocket formation, first chamber of two-way plug-in valve 51 and second chamber are communicated with, two-way plug-in valve 51 is in conducting state, be communicated with between second actuator port of the rod chamber of telescopic oil cylinder 4 and first change-over valve 3, telescopic oil cylinder 4 oil-feed normally and oil return guarantee normal operation and the operation of hydraulic control system.
Be illustrated in figure 4 as the hydraulic control system of the arm of the 3rd embodiment of the present utility model, as another preferred implementation by control unit 5, the described control unit 5 that ends comprises two-way plug-in valve 51, second change-over valve 52 and shuttle valve 53, first chamber of described two-way plug-in valve 51 is communicated with the rod chamber of described telescopic oil cylinder 4, second chamber of described two-way plug-in valve 51 is communicated with second actuator port of described first change-over valve 3, first chamber of described two-way plug-in valve 51 is communicated with first oil inlet of described shuttle valve 53, pipeline connection between second actuator port of second oil inlet of described shuttle valve 53 and second chamber of described two-way plug-in valve 51 and described first change-over valve 3, the oil outlet of described shuttle valve 53 is communicated with the oil inlet of described second change-over valve 52, the return opening of described second change-over valve 52 is communicated with described fuel tank 1, and the actuator port of described second change-over valve 52 is communicated with the control chamber of described two-way plug-in valve 51.
When first change-over valve 3 is in meta, be that hydraulic control system is in readiness for action, second change-over valve 52 is in the working position (with reference to shown in Figure 4) of below, because the pipeline between second actuator port of first chamber of two-way plug-in valve 51 and second chamber of two-way plug-in valve 51 and first change-over valve 3 all is communicated with shuttle valve 53, shuttle valve 53 is subjected to both pressure effects, select wherein bigger one pressure, make it pass through second change-over valve 52 and be communicated with the control chamber of two-way plug-in valve 51.
That is to say, if the pressure in first chamber of two-way plug-in valve 51 is greater than the pressure of the pipeline between second actuator port of second chamber of two-way plug-in valve 51 and first change-over valve 3, then the spool of shuttle valve 53 is in position, a left side (with reference to figure 4), and first chamber of two-way plug-in valve 51 is communicated with the control chamber of two-way plug-in valve 51 by shuttle valve 53 and second change-over valve 52; If the pressure in first chamber of two-way plug-in valve 51 is less than the pressure of the pipeline between second actuator port of second chamber of two-way plug-in valve 51 and first change-over valve 3, then the spool of shuttle valve 53 is in right position (with reference to figure 4), and the pipeline between second actuator port of second chamber of two-way plug-in valve 51 and first change-over valve 3 is communicated with the control chamber of two-way plug-in valve 51 by shuttle valve 53 and second change-over valve 52.
Owing to be provided with spring in the control chamber of two-way plug-in valve 51, thereby the pressure of the fluid in the control chamber of two-way plug-in valve 51 and the elastic force combined action of spring, make the insertion element of two-way plug-in valve 51 stably be pressed against formation awl sealing on the valve pocket, two-way plug-in valve 51 is in closed condition, wherein not having any fluid flows through, be not communicated with between second actuator port of the rod chamber of telescopic oil cylinder 4 and first change-over valve 3, fluid when balance cock 7 takes place to leak in the rod chamber of telescopic oil cylinder 4 can not flow out yet, misoperation can not take place in telescopic oil cylinder 4, guarantee the stability of boom structure, avoid the generation of safety misadventure.
When first change-over valve 3 is in position, a left side or right position, be that hydraulic control system is in running order, second change-over valve 52 is in the working position of top, the control chamber of two-way plug-in valve 51 is communicated with fuel tank 1 by second change-over valve 52, fluid in the control chamber of two-way plug-in valve 51 is back in the fuel tank 1, make the control chamber off-load, thereby the pressure of the fluid in first chamber of two-way plug-in valve 51 overcomes the elastic force effect of the spring in the control chamber, make the insertion element of two-way plug-in valve 51 move and not seal with valve pocket formation, first chamber of two-way plug-in valve 51 and second chamber are communicated with, two-way plug-in valve 51 is in conducting state, be communicated with between second actuator port of the rod chamber of telescopic oil cylinder 4 and first change-over valve 3, telescopic oil cylinder 4 oil-feed normally and oil return guarantee normal operation and the operation of hydraulic control system.
Control for convenience and operation are by control unit 5, as Fig. 2-shown in Figure 5, preferably, described second change-over valve 52 is solenoid directional control valve, this solenoid directional control valve can be two-position three way solenoid directional control valve (with reference to figure 2-Fig. 4), also can be two-position four-way solenoid directional control valve (with reference to figure 5), also not get rid of the change-over valve of other mode certainly.Adopt the change-over valve of automatically controlled form as second change-over valve 52, can only can realize commutation with getting of control solenoid directional control valve is electric with dead electricity, mode is simple and convenient.
If can not be transformed into conducting state by the state of blocking by control unit 5 et out of orders, for example the insertion element of two-way plug-in valve 51 is stuck on the valve pocket and can not moves, second change-over valve, 52 faults or fault make solenoid directional control valve not get, cause second change-over valve 52 not commutate, this moment, first change-over valve 3 was converted to conducting state by off condition, system begins oil-feed, pressure can constantly raise, if fluid discharge in time can cause system pressure too high, particularly during the rodless cavity oil-feed, because the area ratio of rodless cavity and rod chamber is 1～5, the pressure of rod chamber can be very big, can cause telescopic oil cylinder 4 bulging or explosion; Perhaps if the oily temperature of the fluid in the telescopic oil cylinder 4 is subjected to external environment (factors such as sun direct projection, temperature rising) influence and raises, cause the fluid cubic expansion, this moment, the telescopic oil cylinder 4 interior untimely discharges of fluid can cause telescopic oil cylinder 4 detonations, whole hydraulic control system et out of order.
In order to address the above problem, as shown in Figure 5, preferably, described hydraulic control system also comprises first by pass valve 6, the oil inlet of this first by pass valve 6 and described pipeline connection between the rod chamber of control unit 5 and described telescopic oil cylinder 4, the oil outlet of described first by pass valve 6 and described pipeline connection between second actuator port of control unit 4 and described first change-over valve 3.When control unit 5 et out of orders can not be transformed into conducting state by the state of blocking, first change-over valve 3 is in position, a left side or right position, system's oil-feed, if the pressure of the pressure of the pipeline between second actuator port of control unit 4 and first change-over valve 3 or the rod chamber of telescopic oil cylinder 4 reaches the setting pressure of first by pass valve 6, first by pass valve 6 is opened overflow, thereby the pressure in the assurance system can be not too high, avoids damaging Hydraulic Elements.When the oily temperature rise of the fluid in the telescopic oil cylinder 4 causes cubic expansion, pressure in the telescopic oil cylinder 4 raises, if the pressure of rod chamber reaches the setting pressure of first by pass valve 6, first by pass valve 6 is opened overflow, fluid in the rod chamber of telescopic oil cylinder 4 can be discharged, avoid the generation of detonation accident, improve the safety of system.
Pressure can be not too high in entire work process in order to guarantee hydraulic control system, as Fig. 2-shown in Figure 5, preferably, described hydraulic control system also comprises second by pass valve 8, pipeline connection between the oil inlet of the oil outlet of the oil inlet of this second by pass valve 8 and described Hydraulic Pump 2 and described first change-over valve 3, the pipeline connection between the return opening of the oil outlet of described second by pass valve 8 and described fuel tank 1 and described first change-over valve 3.When the pressure of the pipeline between the oil inlet of the oil outlet of Hydraulic Pump 2 and first change-over valve 3 during greater than the setting pressure of second by pass valve 8, second by pass valve 8 is opened overflow, prevent the hypertonia of Hydraulic Pump 2 output, avoid system pressure too high and damage Hydraulic Elements.
Of the present utility modelly provide a kind of hoisting crane on the other hand, this hoisting crane comprises the hydraulic control system of arm and arm, the hydraulic control system of described arm can be controlled the action of described arm, and wherein, the hydraulic control system of described arm is the hydraulic control system of arm recited above.The telescopic oil cylinder of hydraulic control system is installed on the arm, carries out operation to drive hoisting arm expansion.Because hydraulic control system can avoid the misoperation of telescopic oil cylinder, and then prevent arm generation misoperation and avoid the generation of safety misadventure, improved safety and the reliability of system.
Below describe preferred implementation of the present utility model by reference to the accompanying drawings in detail; but; the utility model is not limited to the detail in the above-mentioned embodiment; in technical conceive scope of the present utility model; can carry out multiple simple variant to the technical solution of the utility model, these simple variant all belong to protection domain of the present utility model.
Need to prove in addition, each concrete technical characterictic described in the above-mentioned specific embodiment under reconcilable situation, can make up by any suitable manner, for fear of unnecessary repetition, the utility model is to the explanation no longer separately of various possible array modes.
In addition, also can carry out combination in any between the various embodiment of the present utility model, as long as it is without prejudice to thought of the present utility model, it should be considered as content disclosed in the utility model equally.
Claims (8)
1. the hydraulic control system of an arm, this hydraulic control system comprises fuel tank (1), Hydraulic Pump (2), first change-over valve (3), telescopic oil cylinder (4) and balance cock (7), the oil suction of described Hydraulic Pump (2) is communicated with described fuel tank (1), the pressure hydraulic fluid port of described Hydraulic Pump (2) is communicated with the oil inlet of described first change-over valve (3), the return opening of described first change-over valve (3) is communicated with described fuel tank (1), first actuator port of described first change-over valve (3) is connected with the rodless cavity of described telescopic oil cylinder (4) by described balance cock (7), second actuator port of described first change-over valve (3) is connected with the rod chamber of described telescopic oil cylinder (4), it is characterized in that, described hydraulic control system also comprises by control unit (5), should be on control unit (5) be connected pipeline between second actuator port of the rod chamber of described telescopic oil cylinder (4) and described first change-over valve (3), the control mouth of described balance cock (7) and described pipeline connection between second actuator port of control unit (5) and described first change-over valve (3), at described first change-over valve (3) when being in off condition, describedly pipeline between second actuator port of the rod chamber of described telescopic oil cylinder (4) and described first change-over valve (3) can be blocked by control unit (5).
2. the hydraulic control system of arm according to claim 1, it is characterized in that, the described control unit (5) that ends comprises two-way plug-in valve (51) and second change-over valve (52), first chamber of described two-way plug-in valve (51) is communicated with the rod chamber of described telescopic oil cylinder (4), second chamber of described two-way plug-in valve (51) is communicated with second actuator port of described first change-over valve (3), the oil inlet of described second change-over valve (52) is communicated with first chamber of described two-way plug-in valve (51), the return opening of described second change-over valve (52) is communicated with described fuel tank (1), and the actuator port of described second change-over valve (52) is communicated with the control chamber of described two-way plug-in valve (51).
3. the hydraulic control system of arm according to claim 1, it is characterized in that, the described control unit (5) that ends comprises two-way plug-in valve (51) and second change-over valve (52), first chamber of described two-way plug-in valve (51) is communicated with the rod chamber of described telescopic oil cylinder (4), second chamber of described two-way plug-in valve (51) is communicated with second actuator port of described first change-over valve (3), pipeline connection between second actuator port of second chamber of the oil inlet of described second change-over valve (52) and described two-way plug-in valve (51) and described first change-over valve (3), the return opening of described second change-over valve (52) is communicated with described fuel tank (1), and the actuator port of described second change-over valve (52) is communicated with the control chamber of described two-way plug-in valve (51).
4. the hydraulic control system of arm according to claim 1, it is characterized in that, the described control unit (5) that ends comprises two-way plug-in valve (51), second change-over valve (52) and shuttle valve (53), first chamber of described two-way plug-in valve (51) is communicated with the rod chamber of described telescopic oil cylinder (4), second chamber of described two-way plug-in valve (51) is communicated with second actuator port of described first change-over valve (3), first chamber of described two-way plug-in valve (51) is communicated with first oil inlet of described shuttle valve (53), pipeline connection between second actuator port of second chamber of second oil inlet of described shuttle valve (53) and described two-way plug-in valve (51) and described first change-over valve (3), the oil outlet of described shuttle valve (53) is communicated with the oil inlet of described second change-over valve (52), the return opening of described second change-over valve (52) is communicated with described fuel tank (1), and the actuator port of described second change-over valve (52) is communicated with the control chamber of described two-way plug-in valve (51).
5. according to the hydraulic control system of any described arm among the claim 2-4, it is characterized in that described second change-over valve (52) is solenoid directional control valve.
6. according to the hydraulic control system of any described arm among the claim 1-4, it is characterized in that, described hydraulic control system also comprises first by pass valve (6), the oil inlet of this first by pass valve (6) and described pipeline connection between the rod chamber of control unit (5) and described telescopic oil cylinder (4), the oil outlet of described first by pass valve (6) and described pipeline connection between second actuator port of control unit (4) and described first change-over valve (3).
7. the hydraulic control system of arm according to claim 1, it is characterized in that, described hydraulic control system also comprises second by pass valve (8), pipeline connection between the oil inlet of the oil outlet of the oil inlet of this second by pass valve (8) and described Hydraulic Pump (2) and described first change-over valve (3), the pipeline connection between the return opening of the oil outlet of described second by pass valve (8) and described fuel tank (1) and described first change-over valve (3).
8. hoisting crane, this hoisting crane comprises the hydraulic control system of arm and arm, the hydraulic control system of described arm can be controlled the action of described arm, it is characterized in that the hydraulic control system of described arm is the hydraulic control system according to any described arm among the claim 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320143546 CN203128081U (en) | 2013-03-27 | 2013-03-27 | Hydraulic control system for suspension arm, and crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320143546 CN203128081U (en) | 2013-03-27 | 2013-03-27 | Hydraulic control system for suspension arm, and crane |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203128081U true CN203128081U (en) | 2013-08-14 |
Family
ID=48936079
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320143546 Expired - Fee Related CN203128081U (en) | 2013-03-27 | 2013-03-27 | Hydraulic control system for suspension arm, and crane |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203128081U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104591000A (en) * | 2015-02-11 | 2015-05-06 | 河海大学常州校区 | Accurate lifting rig for travelling crane |
| CN107676316A (en) * | 2017-11-07 | 2018-02-09 | 燕山大学 | A kind of braking control system and control method applied to hydraulic open system |
| CN108622805A (en) * | 2017-03-23 | 2018-10-09 | 雷蒙德股份有限公司 | The system and method stablized for materials handling vehicle upper mast |
-
2013
- 2013-03-27 CN CN 201320143546 patent/CN203128081U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104591000A (en) * | 2015-02-11 | 2015-05-06 | 河海大学常州校区 | Accurate lifting rig for travelling crane |
| CN108622805A (en) * | 2017-03-23 | 2018-10-09 | 雷蒙德股份有限公司 | The system and method stablized for materials handling vehicle upper mast |
| CN108622805B (en) * | 2017-03-23 | 2021-06-25 | 雷蒙德股份有限公司 | System and method for mast stabilization on a materials handling vehicle |
| CN107676316A (en) * | 2017-11-07 | 2018-02-09 | 燕山大学 | A kind of braking control system and control method applied to hydraulic open system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102619794B (en) | Single-cylinder bolt expansion and contraction control system and construction machine | |
| CN203128081U (en) | Hydraulic control system for suspension arm, and crane | |
| CN105257889A (en) | Electro-hydraulic driving system for sluice valve and sluice valve | |
| CN105715597A (en) | Constant-backpressure direct drive type electro hydraulic servo system and control method thereof | |
| CN104214147A (en) | Sudden-changing load energy absorption device of shield propelling hydraulic system | |
| CN202381448U (en) | Hydraulic oil cylinder and hydraulic system | |
| CN204003683U (en) | A kind of hydraulic system and engineering machinery | |
| CN201828418U (en) | Hydraulic test system for horizontal dual-cylinder hydraulic machine | |
| EP2853755B1 (en) | Energy recycling system for working device | |
| CN202326479U (en) | Hydraulic sequential control system and hydraulic control sequential telescoping mechanism | |
| CN112983909B (en) | Movable arm hydraulic system | |
| CN103420290A (en) | Telescopic protection system and crane | |
| CN105041362B (en) | Mining hydraulic medium displacement hydraulic support with pressure | |
| CN204213067U (en) | A kind of load reducer for emergency gate | |
| CN202579379U (en) | Single-cylinder bolt expansion control system and engineering machine | |
| CN112681416A (en) | Excavator energy recovery system, energy recovery method and excavator | |
| CN202745387U (en) | Supporting leg control system and concrete pumping equipment | |
| CN104314923B (en) | A kind of relief valve return liquid system and integrated relief valve return liquid valve block | |
| CN204003684U (en) | Hoist, single-cylinder bolt type telescopic boom and bolt mechanism hydraulic system thereof | |
| CN108915007B (en) | Excavator swing arm bucket rod economizer system | |
| CN202756325U (en) | Double-valve-set power system | |
| AU2017204054A1 (en) | Device for recovering hydraulic energy by connecting two differential cylinders | |
| CN108266419B (en) | Device for integrating power control oil circuit of electro-dynamic and static hydraulic actuator | |
| CN107461375A (en) | Complete-section tunnel boring machine is hinged hydraulic system | |
| CN104088839B (en) | A kind of pressure difference transmitting device, closed type hydraulic system and mining conveyer for emptying warehouse |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130814 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |