CN102900715B - Hydraulic control system for forklift, and forklift - Google Patents
Hydraulic control system for forklift, and forklift Download PDFInfo
- Publication number
- CN102900715B CN102900715B CN201210378147.5A CN201210378147A CN102900715B CN 102900715 B CN102900715 B CN 102900715B CN 201210378147 A CN201210378147 A CN 201210378147A CN 102900715 B CN102900715 B CN 102900715B
- Authority
- CN
- China
- Prior art keywords
- valve
- oil
- pressure
- hydraulic
- selector valve
- 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.)
- Active
Links
Abstract
The invention provides a hydraulic control system for a forklift. The hydraulic control system comprises an oil tank, a pumping component, a first control branch for controlling and driving the forklift to move forward or backward and a second control branch for controlling and driving the forklift to ascend or descend, wherein the pumping component pressurizes hydraulic oil in the oil tank and conveys the pressurized hydraulic oil to the first control branch and the second control branch; and return oil in the first control branch and the second control branch is conveyed to the oil tank through a return oil pipeline. The invention also provides the forklift. By the technical scheme, the lifting tonnage of the forklift is increased; the forklift stably runs, wide-range stepless speed change is easily realized, and power loss during speed change is reduced simultaneously; by a hydraulic drive mode, the weight of the forklift is greatly reduced, and the service lives of elements are prolonged due to a self-lubricating function of the oil; and besides, the environment is slightly polluted, and the forklift is low in noise.
Description
Technical field
The present invention relates to engineering machinery field, more specifically, relate to a kind of truck hydraulic control system and the fork truck containing this hydraulic control system.
Background technique
At present, Domestic Forklift divides two kinds of drive forms: a kind of is electrodynamic type, and another kind is internal combustion engine type.The fork truck of these two kinds of drive forms is widely used in each shipping field.
There is following problem in two kinds of driving mode of correlation technique:
1. electrodynamic type fork truck lifting tonnage is restricted;
2. the maximum tonnage of internal combustion engine fork lift can accomplish 45T, but complex structure, bulky.
Summary of the invention
Technical problem to be solved by this invention is, provides a kind of truck hydraulic control system, and structure is simple, reduces own wt, and can realize large-scale stepless speed change while improving the lifting tonnage of fork truck.
In view of this, the invention provides a kind of truck hydraulic control system, comprise fuel tank, pump, control drive the second controlling brancher of described forklift lifting or decline, also comprise and control and drive the first controlling brancher that described fork truck advances or retreats; Described pump flows to described first controlling brancher and described second controlling brancher by after the hydraulic oil pressurization in described fuel tank, and the oil return of described first controlling brancher and described second controlling brancher is sent back in described fuel tank by oil returning tube.
Adopt hydraulic system to drive fork truck motion, larger power or moment can be obtained, improve the lifting tonnage of fork truck; Fork truck operates steadily, and easily realizes large-scale stepless speed change, decreases power loss during speed change simultaneously; Hydraulically powered mode significantly reduces the weight of fork truck, and the self-lubricating function because of fluid extends the working life of each element, and environmental pollution is little, noise is low.
In technique scheme, preferably, described first controlling brancher comprises the first selector valve and oil hydraulic motor, the pressure port of described first selector valve and the outlet of described pump, two actuator ports of described first selector valve are connected with two working holes of described oil hydraulic motor respectively, and the return opening of described first selector valve is connected with described oil returning tube.
In this technological scheme, the rotation direction of the first selector valve hydraulic control motor, thus control fork truck advance or retreat, which is simple and practical; Oil hydraulic motor, compared with the motor of Same Efficieney, significantly reduces the weight of fork truck self, and oil hydraulic motor, compared with the motor of equal volume, improves the lifting tonnage of fork truck; Employing hydraulic driving noise is low and environmental pollution is little.
In technique scheme, preferably, described first controlling brancher also comprises reduction valve, between the described pressure oil port that described reduction valve is arranged on described first selector valve and the outlet of described pump, for regulating the pressure of hydraulic oil in described first controlling brancher.
Between the first selector valve and pump, arrange reduction valve, the Pressure Drop of the hydraulic oil that pump can transfer out by reduction valve is low to moderate the spendable force value of the first controlling brancher and makes this force value keep constant.Like this, the security incident that the first controlling brancher causes because pressure is excessive is avoided.
In technique scheme, preferably, described first selector valve is three-position four-way electromagnetic directional valve, and described reduction valve is direct acting pressure, and described three-position four-way electromagnetic directional valve and described direct acting pressure adopt the mode superposed up and down to be installed together composition first valve group.
In this technological scheme, the first selector valve is that three position four-way directional control valve ensure that three kinds of working state-rotating forwards, the reversion of oil hydraulic motor and stops, and namely drives fork truck to advance, retreats and stop; Direct acting pressure ensure that the constant pressure of pipeline, further ensures the safety in utilization of hydraulic system.
In above-mentioned any one technological scheme, preferably, described second controlling brancher comprises the second selector valve, two Pilot operated check valves, two one-way throttle valves, two pressure relayes, multi-joint flow distributor, multiple 3rd selector valves and multiple lifting hydraulic cylinders; The pressure oil port of described second selector valve is connected with the outlet of described pump, return opening is communicated with described oil returning tube, first actuator port of described second selector valve is communicated with the rod chamber of multiple described lifting hydraulic cylinder successively after one-way throttle valve described in Pilot operated check valve, described in, and pressure relay described in is arranged on the pipeline between described one-way throttle valve and described lifting hydraulic cylinder; Second actuator port of described second selector valve is communicated with the rodless cavity of multiple described lifting hydraulic cylinder with multiple described 3rd selector valve through Pilot operated check valve, one-way throttle valve, described multi-joint flow distributor described in another described in another successively, and pressure relay described in another is arranged on the pipeline between described one-way throttle valve and described multi-joint flow distributor; What the hydraulic control mouth of Pilot operated check valve described in two connected with described second selector valve two actuator port respectively forms hydraulic lock pipeline corresponding connection, and described lifting hydraulic cylinder can be made to rest on arbitrary position; Pressure relay described in two is in order to detect oil pressure in corresponding pipeline and for overpressure alarm, described multi-joint flow distributor makes the flow of the hydraulic oil entered in lifting hydraulic cylinder described in each equal, and described 3rd selector valve is for controlling the on-off of described multi-joint flow distributor and described lifting hydraulic cylinder.
In this technological scheme, Pilot operated check valve has good sealing and pressure holding function, can ensure the pressure stability of lifting hydraulic cylinder, also can prevent automatic downslide during lifting hydraulic cylinder stopping action simultaneously; The adjustable lifting hydraulic cylinder of throttle valve rises and rate of descent, adjusts and can realize the large-scale stepless change adjustment of fork truck by the flow of throttle valve; Pressure relay can the pressure of testing pipes, sends alarm signal, ensure that the Security of the second controlling brancher when the force value detected exceeds predefined value; Made the flow of the hydraulic oil entered in each lifting hydraulic cylinder equal by multi-joint flow distributor, ensure forklift lifting or falling head consistent.
In technique scheme, preferably, described second selector valve is three-position four-way electromagnetic directional valve, and Pilot operated check valve described in one-way throttle valve, two described in two and described three-position four-way electromagnetic directional valve adopt the mode of upper, middle and lower superposition to be installed together composition second valve group; Described multi-joint flow distributor is six gear wheel flow-rate distributors, described 3rd selector valve is seat valve formula 2/2-way solenoid directional control valve, seat valve formula 2/2-way solenoid directional control valve described in the outlet one of each connection of described six gear wheel flow-rate distributors, described in each, seat valve formula 2/2-way solenoid directional control valve controls two described lifting hydraulic cylinders.
In this technological scheme, the second selector valve is that three position four-way directional control valve ensure that three kinds of working state-liftings of lifting hydraulic cylinder, decline, stopping; Second valve group can ensure that the second controlling brancher realizes the stepless change of forklift lifting, decreases power loss during speed change, ensure that fork truck operates steadily simultaneously; 3rd selector valve is seat valve formula 2/2-way solenoid directional control valve, this valve easy installation and removal, is convenient to repair and replacement; 2/2-way solenoid valve can control two lifting hydraulic cylinders and six gear wheel flow-rate distributors wherein one export between on-off, when the second selector valve is in halted state, 2/2-way solenoid valve is placed in not on-state, and lifting hydraulic cylinder can be made to remain unchanged at this height and position.
In technique scheme, described pump comprises oil hydraulic pump, Oil pump electrical machinery, one-way valve, high pressure filter and pressure regulator valve; Described Oil pump electrical machinery drives described oil hydraulic pump to be pumped by the fluid in described fuel tank, and the pressure oil pumped flows to described first selector valve and described second selector valve through described one-way valve, described high pressure filter successively; Described pressure regulator valve is arranged between the export pipeline of described one-way valve and described oil returning tube, pumps the pressure of hydraulic oil for adjusting described pump.
In this technological scheme, the one-way valve of setting can only make fluid one-way flow, prevents the reverse inflow pump group of high pressure oil; The fluid that oil hydraulic pump is discharged can be carried out essence and filter by the high pressure filter arranged, and prevents impurity particle plugging fluid pressure valve, pollutes lifting hydraulic cylinder and oil hydraulic motor; The size of the pressure regulator valve adjustable pump delivery pressure value arranged.
In technique scheme, described oil hydraulic pump is high-pressure gear pump, and described high pressure filter is with obstruction alarming relay, and described pressure regulator valve is direct-acting overflow valve, and the pressure after adjustment shows by the shock-proof pressure gauge be arranged on pipeline.
In this technological scheme, high pressure filter is furnished with obstruction alarming relay, and when high pressure filter blocks, block alarming relay and send signal, prompting staff clears up in time, ensure that the Security that hydraulic system uses; Regulated the size of pump group delivery pressure by the knob adjusting direct-acting overflow valve, it should be noted that the highest adjustment pressure must not be greater than the pressure of default, and the pressure after adjustment must lock.
In technique scheme, preferably, described fuel tank is also provided with the level meter of hydraulic air filter and band Temperature displaying, the air that described hydraulic air filter both can purify the suction of described fuel tank also can be used for refueling, and the height of oil tank liquid level described in the level meter observable of described band Temperature displaying also can show the temperature of fluid.
In this technological scheme, when hydraulic work system, decline when rising during liquid level in fuel tank, filter by the air of outwardly discharging in fuel tank or the air sucked in fuel tank by the external world by hydraulic air filter, namely dedusting is carried out to the air sucked, make fuel tank inner fluid not by the pollution of impurity in air; In addition, hydraulic work system is of long duration has fluid consumption, and hydraulic air filter can be used as oil filler, supplements the fluid consumed, to ensure that fuel tank inner fluid is sufficient; The height of liquid level in fuel tank can be observed easily by the glass vision panel of level meter, fluid can be added timely time not enough with convenient fluid, level meter is with Temperature displaying, while observing height of liquid level, the temperature of fluid can be learnt intuitively, fluid time too high with convenient oil liquid temperature, can be taken measures in time to cool.
Present invention also offers a kind of fork truck, comprise the truck hydraulic control system described in above-mentioned arbitrary technological scheme.Obviously, this fork truck has whole beneficial effects of above-mentioned truck hydraulic control system, does not repeat them here, but its application all should within protection scope of the present invention.
In sum, truck hydraulic control system provided by the invention saves space, adopts hydraulic system to drive fork truck motion, can obtain larger power or moment, improve the lifting tonnage of fork truck; Fork truck operates steadily, and easily realizes large-scale stepless speed change, decreases power loss during speed change simultaneously; Hydraulically powered mode significantly reduces the weight of fork truck, and the self-lubricating function because of fluid extends the working life of each element, and environmental pollution is little, noise is low.
Accompanying drawing explanation
Fig. 1 is the schematic diagram according to truck hydraulic control system one embodiment of the present invention.
Wherein, the corresponding relation in Fig. 1 between reference character and component names is:
1 fuel tank, 2 direct-acting overflow valves, 3 hydraulic air filters, 4 Oil pump electrical machineries, 5 high-pressure gear pumps,
6 one-way valves, 7 shock-proof pressure gauges, 8 high pressure filters, 9 reduction valve, 10 first selector valves,
11 oil hydraulic motors, 12 lifting hydraulic cylinders, 13 the 3rd selector valves, 14 6 gear wheel flow-rate distributors,
15 pressure relayes, 16 one-way throttle valves, 17 Pilot operated check valves, 18 second selector valves,
19 oil returning tubes, the level meter of 20 band Temperature displaying, 21 first valve groups, 22 second valve groups.
Embodiment
In order to more clearly understand above-mentioned purpose of the present invention, feature and advantage, below in conjunction with the drawings and specific embodiments, the present invention is further described in detail.It should be noted that, when not conflicting, the feature in the embodiment of the application and embodiment can combine mutually.
Set forth a lot of detail in the following description so that fully understand the present invention; but; the present invention can also adopt other to be different from mode described here to implement, and therefore, protection scope of the present invention is not by the restriction of following public specific embodiment.
Fig. 1 is the schematic diagram according to truck hydraulic control system one embodiment of the present invention.
As shown in Figure 1, the invention provides a kind of truck hydraulic control system, comprise fuel tank 1, pump, control drive the second controlling brancher of forklift lifting or decline, also comprise and control and drive the first controlling brancher that fork truck advances or retreats; Pump flows to the first controlling brancher and the second controlling brancher by after the hydraulic oil pressurization in fuel tank 1, and the oil return of the first controlling brancher and the second controlling brancher is sent back in fuel tank 1 by oil returning tube 19.
Adopt hydraulic system to drive fork truck motion, larger power or moment can be obtained, improve the lifting tonnage of fork truck; Fork truck operates steadily, and easily realizes large-scale stepless speed change, decreases power loss during speed change simultaneously; Hydraulically powered mode significantly reduces the weight of fork truck, and the self-lubricating function because of fluid extends the working life of each element, and environmental pollution is little, noise is low.
In the above-described embodiments, first controlling brancher comprises the first selector valve 10 and oil hydraulic motor 11, the pressure port of the first selector valve 10 and the outlet of pump, two actuator ports of the first selector valve 10 are connected with two working holes of oil hydraulic motor 11 respectively, and the return opening of the first selector valve 10 is connected with oil returning tube 19.
In this technological scheme, by the rotation direction of the first selector valve hydraulic control motor, thus control fork truck advance or retreat, which is simple and practical; Oil hydraulic motor, compared with the motor of Same Efficieney, significantly reduces the weight of fork truck self, and oil hydraulic motor, compared with the motor of equal volume, improves the lifting tonnage of fork truck; Employing hydraulic driving noise is low and environmental pollution is little.
In the above-described embodiments, the first controlling brancher also comprises reduction valve 9, between the pressure oil port that reduction valve 9 is arranged on the first selector valve 10 and the outlet of pump, for regulating the pressure of hydraulic oil in the first controlling brancher.
Between the first selector valve and pump, arrange reduction valve, the Pressure Drop of the hydraulic oil that pump can transfer out by reduction valve is low to moderate the spendable force value of the first controlling brancher and makes this force value keep constant.Like this, the security incident that the first controlling brancher causes because pressure is excessive is avoided.
In the above-described embodiments, the first selector valve 10 is three-position four-way electromagnetic directional valve, and reduction valve 9 is direct acting pressure, and three-position four-way electromagnetic directional valve and direct acting pressure adopt the mode superposed up and down to be installed together composition first valve group 21.
In this technological scheme, the first selector valve is that three position four-way directional control valve ensure that three kinds of working state-rotating forwards, the reversion of oil hydraulic motor and stops, and fork truck can be driven can to advance, retreat and stop; Direct acting pressure ensure that the constant pressure of pipeline, further ensures the safety in utilization of hydraulic system.
In above-mentioned any embodiment, the second controlling brancher comprises the second selector valve 18, two Pilot operated check valve 17, two one-way throttle valve 16, two pressure relayes 15, multi-joint flow distributor, multiple 3rd selector valve 13 and multiple lifting hydraulic cylinder 12; The pressure oil port of the second selector valve 18 is connected with the outlet of pump, return opening is communicated with oil returning tube 19, first actuator port of the second selector valve 18 is communicated with the rod chamber of multiple lifting hydraulic cylinder 12 successively after Pilot operated check valve 17, one-way throttle valve 16, and a pressure relay 15 is arranged on the pipeline between one-way throttle valve 16 and lifting hydraulic cylinder 12; Second actuator port of the second selector valve 18 is communicated with the rodless cavity of multiple lifting hydraulic cylinder 12 with multiple 3rd selector valve 13 through another Pilot operated check valve 17, another one-way throttle valve 16, multi-joint flow distributor successively, and another pressure relay 15 is arranged on the pipeline between one-way throttle valve 16 and multi-joint flow distributor; What the hydraulic control mouth of two Pilot operated check valves 17 connected with the second selector valve 18 liang of actuator ports respectively forms hydraulic lock pipeline corresponding connection, and described lifting hydraulic cylinder 12 can be made to rest on arbitrary position; Two pressure relayes 15 are in order to detect oil pressure in corresponding pipeline and for overpressure alarm, multi-joint flow distributor makes the flow of the hydraulic oil entered in each lifting hydraulic cylinder 12 equal, and the 3rd selector valve 13 is for controlling the on-off of multi-joint flow distributor and lifting hydraulic cylinder 12.
In this technological scheme, Pilot operated check valve has good sealing and pressure holding function, can ensure the pressure stability of lifting hydraulic cylinder, also can prevent automatic downslide during lifting hydraulic cylinder stopping action simultaneously; The adjustable lifting hydraulic cylinder of throttle valve rises and rate of descent, adjusts and can realize the large-scale stepless change adjustment of fork truck by the flow of throttle valve; Pressure relay can the pressure of testing pipes, sends alarm signal, ensure that the Security of the second controlling brancher when the force value detected exceeds predefined value; Made the flow of the hydraulic oil entered in each lifting hydraulic cylinder equal by multi-joint flow distributor, ensure forklift lifting or falling head consistent.
In the above-described embodiments, the second selector valve 18 is three-position four-way electromagnetic directional valve, and two one-way throttle valve 16, two Pilot operated check valves 17 and three-position four-way electromagnetic directional valve adopt the mode of upper, middle and lower superposition to be installed together composition second valve group 22; Multi-joint flow distributor is six gear wheel flow-rate distributors 14,3rd selector valve 13 is seat valve formula 2/2-way solenoid directional control valve, the outlet one seat valve formula 2/2-way solenoid directional control valve of each connection of six gear wheel flow-rate distributors 14, each seat valve formula 2/2-way solenoid directional control valve controls two lifting hydraulic cylinders 12.
In this technological scheme, the second selector valve is that three position four-way directional control valve ensure that three kinds of working state-liftings of lifting hydraulic cylinder, stopping, decline; Second valve group can ensure that the second controlling brancher realizes the stepless change of forklift lifting, decreases power loss during speed change, ensure that fork truck operates steadily simultaneously; 3rd selector valve is seat valve formula 2/2-way solenoid directional control valve, this valve easy installation and removal, is convenient to repair and replacement; 2/2-way solenoid valve can control two lifting hydraulic cylinders and six gear wheel flow-rate distributors wherein one export between on-off, when the second selector valve is in halted state, 2/2-way solenoid valve is placed in not on-state, lifting hydraulic cylinder can be made to remain on this height and position and remain unchanged.
In the above-described embodiments, pump comprises oil hydraulic pump, Oil pump electrical machinery 4, one-way valve 6, high pressure filter 8 and pressure regulator valve; Oil pump electrical machinery 4 drives oil hydraulic pump to be pumped by the fluid in fuel tank 1, and the pressure oil pumped flows to the first selector valve 10 and the second selector valve 18 through one-way valve 6, high pressure filter 8 successively; Pressure regulator valve is arranged between the export pipeline of one-way valve 6 and oil returning tube 19, pumps the pressure of hydraulic oil for adjusting pump.
In this technological scheme, the one-way valve of setting can only make fluid one-way flow, prevents the reverse inflow pump group of high pressure oil; The fluid that oil hydraulic pump is discharged can be carried out essence and filter by the high pressure filter arranged, and prevents impurity particle plugging fluid pressure valve, pollutes lifting hydraulic cylinder and oil hydraulic motor; The size of the pressure regulator valve adjustable pump group delivery pressure value arranged.
In the above-described embodiments, preferably, oil hydraulic pump is high-pressure gear pump 5, and high pressure filter 8 is with obstruction alarming relay, and pressure regulator valve is direct-acting overflow valve 2, and the pressure after adjustment shows by the shock-proof pressure gauge 7 be arranged on pipeline.
In this technological scheme, high pressure filter is furnished with obstruction alarming relay, and when high pressure filter blocks, block alarming relay and send signal, prompting staff clears up in time, ensure that the Security that hydraulic system uses; Regulated the size of pump group delivery pressure by the knob adjusting direct-acting overflow valve, it should be noted that the highest adjustment pressure must not be greater than the pressure of default, and the pressure after adjustment must lock.
In the above-described embodiments, fuel tank 1 is also provided with the level meter 20 of hydraulic air filter 3 and band Temperature displaying, the air that hydraulic air filter 3 both can purify fuel tank 1 suction also can be used for refueling, and the height of level meter 20 observable fuel tank 1 liquid level of band Temperature displaying also can show the temperature of fluid.
In this technological scheme, when hydraulic work system, decline when rising during liquid level in fuel tank, filter by the air of outwardly discharging in fuel tank or the air sucked in fuel tank by the external world by hydraulic air filter, namely dedusting is carried out to the air sucked, make fuel tank inner fluid not by the pollution of impurity in air; In addition, hydraulic work system is of long duration has fluid consumption, and hydraulic air filter can be used as oil filler, supplements the fluid consumed, to ensure that fuel tank inner fluid is sufficient; The height of liquid level in fuel tank can be observed easily by the glass vision panel of level meter, fluid can be added timely time not enough with convenient fluid, level meter is with Temperature displaying, while observing height of liquid level, the temperature of fluid can be learnt intuitively, fluid time too high with convenient oil liquid temperature, can be taken measures in time to cool.
Present invention also offers a kind of fork truck, comprise the truck hydraulic control system described in above-mentioned arbitrary technological scheme.Obviously, this fork truck has whole beneficial effects of above-mentioned truck hydraulic control system, does not repeat them here, but its application all should within protection scope of the present invention.
As shown in Figure 1, truck hydraulic control system is primarily of formations such as fuel tank 1, pump, the first controlling brancher and the second controlling brancher, and the working principle of its hydraulic control system is:
Fuel tank 1 Main Function is used to store fluid to meet the oil suction of high-pressure gear pump 5, prevents high-pressure gear pump 5 from inhaling sky, collects the oil return of lifting hydraulic cylinder 12 and valve simultaneously.Fuel tank 1 is provided with: the level meter 20 of band Temperature displaying simultaneously, observes height of liquid level in fuel tank 1 by glass vision panel is convenient, also can show the temperature in fuel tank 1 simultaneously; Hydraulic air filter 3, rises or declines during liquid level in fuel tank 1 when hydraulic work system, by vent the air overboard in fuel tank 1 during rising, suck air outside to inside during decline by fuel tank 1, can also purify the air of suction simultaneously; Hydraulic air filter 3 also can be used as oil filler.
Pump is made up of high-pressure gear pump 5, Oil pump electrical machinery 4, one-way valve 6, high pressure filter 8 and direct-acting overflow valve 2, high-pressure gear pump 5, under the driving of Oil pump electrical machinery 4, by the hydraulic oil in fuel tank 1 by sucking the oil sucting cavity of high-pressure gear pump 5, the fluid of oil sucting cavity is discharged along with the pressure oil cavity that is rotated through of pump; The fluid of discharging filters the high pressure filter 8 blocking warning function arrive the first controlling brancher and the second controlling brancher through one-way valve 6, band, the pressure value P that now pump group exports is set up by direct-acting overflow valve 2, direct-acting overflow valve 2 is connected with shock-proof pressure gauge 7, and the force value of setting shows by shock-proof pressure gauge 7.
Wherein, band filters the high pressure filter 8 of blocking warning function, the fluid of discharging from high-pressure gear pump 5 is carried out first time essence filtration, prevents impurity particle plugging fluid pressure valve, pollute lifting hydraulic cylinder 12 and oil hydraulic motor 11.This high pressure filter 8 is with plugged filter warning function; Direct-acting overflow valve 2, by adjustment direct-acting overflow valve 2 knob, can regulate the size of pump group delivery pressure P value, but the highest adjustment pressure must not be greater than default pressure, the pressure after adjustment must lock; One-way valve 6 can only make fluid one-way flow, prevents the reverse inflow pump group of high pressure oil.
Fork truck controls a point two-way: a road controls the advance of radial piston hydraulic motor 11 and first controlling brancher of retrogressing of forklift-walking; The lifting of another road operating console forklift lifting oil hydraulic cylinder 12 and the second controlling brancher of decline.
First controlling brancher, is made up of oil hydraulic motor 11, reduction valve 9, first selector valve 10.Wherein, the first selector valve 10 is three-position four-way electromagnetic directional valve, and is formed the first valve group 21 with reduction valve 9 with the form superposed up and down.By regulating the knob of reduction valve 9, can obtain any pressure value P 1 lower than system pressure P, the actual torque of this pressure value P 1 needed for radial piston hydraulic motor 11 determines.When the electromagnet at the first selector valve 10 two ends is not all energized, first selector valve 10 is in interposition, now pressure oil port and return opening, the first actuator port, the second actuator port are all obstructed, hydraulic oil can get back to fuel tank 1 from the first actuator port, the second actuator port and return opening by oil returning tube 19, and now oil hydraulic motor 11 is failure to actuate.When the left side electromagnet of the first selector valve 10 obtains electric, during the electromagnet dead electricity of right side, the first selector valve 10 is in intersection position, and now pressure oil port is communicated with the second actuator port, and return opening is communicated with the first actuator port.Pressure oil enters the right chamber of oil hydraulic motor 11 through the second actuator port of the first selector valve 10; The pressure oil in the left chamber of oil hydraulic motor 11 flows back to fuel tank 1 through oil returning tube 19 again through the first actuator port-return opening of the first selector valve 10, and now pressure oil drives oil hydraulic motor 11 to turn clockwise.When the right side electromagnet energising of the first selector valve 10, during the electromagnet dead electricity of left side, the first selector valve 10 is in parallel position, and now pressure oil port is communicated with the first actuator port, and return opening is communicated with the second actuator port.Pressure oil enters the left chamber of oil hydraulic motor 11 through the first actuator port of the first selector valve 10, and the pressure oil in the right chamber of motor flows back to fuel tank 1 through oil returning tube 19 again through the second actuator port-return opening of the first selector valve 10, now pressure oil drives oil hydraulic motor 11 to be rotated counterclockwise.
The lifting of the second controlling brancher operating console forklift lifting oil hydraulic cylinder 12 and decline.
These route second selector valve 18, two Pilot operated check valve 17, two one-way throttle valve 16, two pressure relay 15, six gear wheel flow-rate distributor 14, six seat valve formula the 3rd selector valves 13 and 12 lifting hydraulic cylinders 12 form; Second selector valve 18 forms the second valve group 22 with two Pilot operated check valves 17 and two one-way throttle valves 16 with the form that upper, middle and lower superpose; First actuator port of the second valve group 22 is directly connected with the rod chamber of 12 lifting hydraulic cylinders 12 by pipeline; And the second actuator port of the second valve group 22 is introduced into the first actuator port of six gear wheel flow-rate distributors 14, the hydraulic oil entered is divided into six parts by six gear wheel flow-rate distributors 14, and discharge from six outlets of six gear wheel flow-rate distributors 14 respectively, the fluid of discharging enters the entrance of six the 3rd selector valves 13 with man-to-man form, when the electromagnet no electric circuit of six the 3rd selector valves 13, namely be in closed condition, 12 lifting hydraulic cylinders 12 are failure to actuate; When the electromagnet of six the 3rd selector valves 13 is energized simultaneously, be namely in on-state, three selector valve 13 of hydraulic oil after connecting enters the rodless cavity of 12 lifting hydraulic cylinders 12 respectively.When the electromagnet of the second selector valve 18 both sides is not all energized, second selector valve 18 mediates position, now the pressure oil port of the second selector valve 18 and the first actuator port, the second actuator port, return opening are all obstructed, hydraulic oil can flow back to fuel tank 1 from the first actuator port, the second actuator port and return opening by oil returning tube 19, and now 12 lifting hydraulic cylinders 12 are failure to actuate.Electromagnet on the left of the second selector valve 18 obtains electric, and during the electromagnet dead electricity on right side, the second selector valve 18 is in and intersects position, and now pressure oil port is communicated with the second actuator port, and return opening is communicated with the first actuator port.Pressure oil enters the rodless cavity of 12 lifting hydraulic cylinders 12 after the second actuator port of the second selector valve 18, six gear wheel flow-rate distributors 14, the 3rd selector valve 13; And the rod chamber of 12 lifting hydraulic cylinders 12 flows back to fuel tank 1 through the first actuator port-return opening of the second selector valve 18 through oil returning tube 19, now 12 lifting hydraulic cylinder 12 piston rods stretch out, forklift lifting.Electromagnet energising on the right side of the second selector valve 18, during the electromagnet dead electricity in left side, the second selector valve 18 is in parallel position, and now pressure oil port is communicated with the first actuator port, and return opening is communicated with the second actuator port.Pressure oil enters the rod chamber of 12 lifting hydraulic cylinders 12 through the pressure oil port of the second selector valve 18, the hydraulic oil of 12 lifting hydraulic cylinder 12 rodless cavities, enter six gear wheel flow-rate distributors 14 through six the 3rd selector valves 13, the second actuator port-return opening that the second actuator port through six gear wheel flow-rate distributors 14 enters the second selector valve 18 again flows back to fuel tank 1 through oil returning tube 19 again; Now pressure oil drives 12 lifting hydraulic cylinders 12 to decline.
Wherein, the second selector valve 18 is three-position four-way electromagnetic directional valve, and the 3rd selector valve 13 is seat valve formula 2/2-way solenoid directional control valve, and one-way throttle valve 16 has and regulates fork truck lifting hydraulic cylinder 12 to rise and the function of rate of descent; Pilot operated check valve 17 has pressure holding function; Pressure relay 15 has overpressure alarm function.
In sum, truck hydraulic control system provided by the invention can save space, adopts hydraulic system to drive fork truck motion, can obtain larger power or moment, improve the lifting tonnage of fork truck; Fork truck operates steadily, and easily realizes large-scale stepless speed change, decreases power loss during speed change simultaneously; Hydraulically powered mode significantly reduces the weight of fork truck, and the self-lubricating function because of fluid extends the working life of each element, and environmental pollution is little, noise is low.
In the present invention, term " first ", " second ", " the 3rd " object only for describing, and instruction or hint relative importance can not be interpreted as; Unless otherwise clearly defined and limited.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a truck hydraulic control system, comprises fuel tank (1), pump, control drive the second controlling brancher of described forklift lifting or decline, it is characterized in that, also comprise and control and drive the first controlling brancher that described fork truck advances or retreats; Described pump flows to described first controlling brancher and described second controlling brancher by after the hydraulic oil pressurization in described fuel tank (1), and the oil return of described first controlling brancher and described second controlling brancher is sent back in described fuel tank (1) by oil returning tube (19);
Described second controlling brancher comprises the second selector valve (18), two Pilot operated check valves (17), two one-way throttle valves (16), two pressure relayes (15), multi-joint flow distributor, multiple 3rd selector valve (13) and multiple lifting hydraulic cylinders (12);
The pressure oil port of described second selector valve (18) is connected with the outlet of described pump, return opening is communicated with described oil returning tube (19), first actuator port of described second selector valve (18) is communicated with the rod chamber of multiple described lifting hydraulic cylinder (12) successively after one-way throttle valve (16) described in Pilot operated check valve described in (17), and pressure relay described in (15) is arranged on the pipeline between described one-way throttle valve (16) and described lifting hydraulic cylinder (12); Second actuator port of described second selector valve (18) is communicated with the rodless cavity of multiple described lifting hydraulic cylinder (12) with multiple described 3rd selector valve (13) through Pilot operated check valve described in another (17), one-way throttle valve described in another (16), described multi-joint flow distributor successively, and pressure relay described in another (15) is arranged on the pipeline between described one-way throttle valve (16) and described multi-joint flow distributor;
What the hydraulic control mouth of Pilot operated check valve described in two (17) connected with described second selector valve (18) two actuator port respectively forms hydraulic lock pipeline corresponding connection, and described lifting hydraulic cylinder (12) can be made to rest on arbitrary position; Pressure relay described in two (15) is in order to detect oil pressure in corresponding pipeline and for overpressure alarm, the flow that described multi-joint flow distributor makes to enter the hydraulic oil in lifting hydraulic cylinder described in each (12) is equal, and described 3rd selector valve (13) is for controlling the on-off of described multi-joint flow distributor and described lifting hydraulic cylinder (12).
2. truck hydraulic control system according to claim 1, it is characterized in that, described first controlling brancher comprises the first selector valve (10) and oil hydraulic motor (11), the described pressure port of the first selector valve (10) and the outlet of described pump, two actuator ports of described first selector valve (10) are connected with two working holes of described oil hydraulic motor (11) respectively, and the return opening of described first selector valve (10) is connected with described oil returning tube (19).
3. truck hydraulic control system according to claim 2, it is characterized in that, described first controlling brancher also comprises reduction valve (9), between the described pressure oil port that described reduction valve (9) is arranged on described first selector valve (10) and the outlet of described pump, for regulating the pressure of hydraulic oil in described first controlling brancher.
4. truck hydraulic control system according to claim 3, it is characterized in that, described first selector valve (10) is three-position four-way electromagnetic directional valve, described reduction valve (9) is direct acting pressure, and described three-position four-way electromagnetic directional valve and described direct acting pressure adopt the mode superposed up and down to be installed together composition first valve group (21).
5. truck hydraulic control system according to claim 4, it is characterized in that, described second selector valve (18) is three-position four-way electromagnetic directional valve, and Pilot operated check valve (17) described in one-way throttle valve described in two (16), two and described three-position four-way electromagnetic directional valve adopt the mode of upper, middle and lower superposition to be installed together composition second valve group (22); Described multi-joint flow distributor is six gear wheel flow-rate distributors (14), described 3rd selector valve (13) is seat valve formula 2/2-way solenoid directional control valve, seat valve formula 2/2-way solenoid directional control valve described in the outlet one of each connection of described six gear wheel flow-rate distributors (14), described in each, seat valve formula 2/2-way solenoid directional control valve controls two described lifting hydraulic cylinders (12).
6. truck hydraulic control system according to claim 4, is characterized in that, described pump comprises oil hydraulic pump, Oil pump electrical machinery (4), one-way valve (6), high pressure filter (8) and pressure regulator valve; Described Oil pump electrical machinery (4) drives described oil hydraulic pump to be pumped by the fluid in described fuel tank (1), and the pressure oil pumped flows to described first selector valve (10) and described second selector valve (18) through described one-way valve (6), described high pressure filter (8) successively; Described pressure regulator valve is arranged between the export pipeline of described one-way valve (6) and described oil returning tube (19), pumps the pressure of hydraulic oil for adjusting described pump.
7. truck hydraulic control system according to claim 6, it is characterized in that, described oil hydraulic pump is high-pressure gear pump (5), described high pressure filter (8) is with obstruction alarming relay, described pressure regulator valve is direct-acting overflow valve (2), and the pressure after adjustment shows by the shock-proof pressure gauge (7) be arranged on pipeline.
8. truck hydraulic control system according to claim 6, it is characterized in that, described fuel tank (1) is also provided with the level meter (20) of hydraulic air filter (3) and band Temperature displaying, described hydraulic air filter (3) both can purify the air that described fuel tank (1) sucks and also can be used for refueling, and the height of fuel tank (1) liquid level described in level meter (20) observable of described band Temperature displaying also can show the temperature of fluid.
9. a fork truck, is characterized in that, comprises the truck hydraulic control system according to any one of claim 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210378147.5A CN102900715B (en) | 2012-10-08 | 2012-10-08 | Hydraulic control system for forklift, and forklift |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210378147.5A CN102900715B (en) | 2012-10-08 | 2012-10-08 | Hydraulic control system for forklift, and forklift |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102900715A CN102900715A (en) | 2013-01-30 |
| CN102900715B true CN102900715B (en) | 2015-06-24 |
Family
ID=47573134
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210378147.5A Active CN102900715B (en) | 2012-10-08 | 2012-10-08 | Hydraulic control system for forklift, and forklift |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102900715B (en) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104634023A (en) * | 2014-12-08 | 2015-05-20 | 中国船舶工业系统工程研究院 | Fluid flow control system and variable flow control method |
| CN104632788A (en) * | 2014-12-30 | 2015-05-20 | 大连维乐液压制造有限公司 | Stepping mechanism hydraulic station |
| CN105298957A (en) * | 2015-11-25 | 2016-02-03 | 上海电气液压气动有限公司 | Pressure adjustable bolt oil cylinder hydraulic system |
| CN105257611A (en) * | 2015-11-25 | 2016-01-20 | 上海电气液压气动有限公司 | Hydraulic system with plug pin oil cylinders for super-large heavy equipment |
| CN105298956A (en) * | 2015-11-25 | 2016-02-03 | 上海电气液压气动有限公司 | Pin type oil cylinder system with self-locking function |
| CN105993253A (en) * | 2016-07-12 | 2016-10-12 | 江川新天力现代农业装备制造有限公司 | Multifunctional orchard operation machine |
| CN106050779B (en) * | 2016-07-18 | 2018-01-23 | 江苏恒立液压科技有限公司 | forklift multi-way valve |
| CN106856794B (en) * | 2017-02-14 | 2019-07-02 | 临沭县东泰机械有限公司 | A kind of Hynautio-steering and peanut combine |
| CN107178533A (en) * | 2017-05-19 | 2017-09-19 | 青神格林维尔流体动力控制技术有限公司 | A kind of station plug-in commutation integrated package |
| CN108105390A (en) * | 2017-12-25 | 2018-06-01 | 辽宁三三工业有限公司 | A kind of new complete-section tunnel boring machine is main to drive sealing system and its construction method |
| CN108316936B (en) * | 2018-03-13 | 2019-06-25 | 中铁隧道局集团有限公司 | Shield machine fltting speed control device |
| CN108716497A (en) * | 2018-07-28 | 2018-10-30 | 蚌埠液力机械有限公司 | A kind of tilting oil cylinder of fork duty testing device |
| CN108910789B (en) * | 2018-09-28 | 2019-12-27 | 江苏南京白马现代农业高新技术产业园有限公司 | Control valve group for hydraulic system of electric forklift and hydraulic system of electric forklift |
| CN112594239B (en) * | 2020-12-24 | 2022-07-01 | 天津市天锻压力机有限公司 | Hydraulic control system for jaw of skin stretching hydraulic machine |
| CN114394490B (en) * | 2021-12-25 | 2023-09-15 | 山东泰开汽车制造有限公司 | Cable winding and unwinding device for narrow and complex channel and use method |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2049642U (en) * | 1989-01-21 | 1989-12-20 | 机械电子部北京起重运输机械研究所 | Hydraulic system for scraper |
| CN2076972U (en) * | 1990-11-21 | 1991-05-15 | 彭昌宗 | Fork lift truck energy-saving hydraulic control system |
| US5081837A (en) * | 1988-04-08 | 1992-01-21 | Diesel Kiki Co., Ltd. | Hydraulic control circuit |
| CN1405031A (en) * | 2001-08-13 | 2003-03-26 | 同济大学 | Novel forklift-walking speed-regulating device |
| CN101711221A (en) * | 2008-02-04 | 2010-05-19 | 浙江佳力科技股份有限公司 | Full hydraulic AC electrical forklift |
| CN201842619U (en) * | 2010-10-31 | 2011-05-25 | 合肥搬易通科技发展有限公司 | Crawler-type forklift hydraulic system |
| CN102094861A (en) * | 2010-12-02 | 2011-06-15 | 徐州重型机械有限公司 | Multi-pump concurrent flow hydraulic system for crane and concurrent valve bank |
| CN102134047A (en) * | 2011-02-15 | 2011-07-27 | 安徽合力股份有限公司 | Energy-saving hydraulic system of electric forklift |
| JP2012505133A (en) * | 2008-10-09 | 2012-03-01 | カスケード コーポレーション | Hydraulic clamping force equalization control |
| CN202811582U (en) * | 2012-10-08 | 2013-03-20 | 北京索普液压机电有限公司 | Forklift hydraulic control system and forklift |
-
2012
- 2012-10-08 CN CN201210378147.5A patent/CN102900715B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5081837A (en) * | 1988-04-08 | 1992-01-21 | Diesel Kiki Co., Ltd. | Hydraulic control circuit |
| CN2049642U (en) * | 1989-01-21 | 1989-12-20 | 机械电子部北京起重运输机械研究所 | Hydraulic system for scraper |
| CN2076972U (en) * | 1990-11-21 | 1991-05-15 | 彭昌宗 | Fork lift truck energy-saving hydraulic control system |
| CN1405031A (en) * | 2001-08-13 | 2003-03-26 | 同济大学 | Novel forklift-walking speed-regulating device |
| CN101711221A (en) * | 2008-02-04 | 2010-05-19 | 浙江佳力科技股份有限公司 | Full hydraulic AC electrical forklift |
| JP2012505133A (en) * | 2008-10-09 | 2012-03-01 | カスケード コーポレーション | Hydraulic clamping force equalization control |
| CN201842619U (en) * | 2010-10-31 | 2011-05-25 | 合肥搬易通科技发展有限公司 | Crawler-type forklift hydraulic system |
| CN102094861A (en) * | 2010-12-02 | 2011-06-15 | 徐州重型机械有限公司 | Multi-pump concurrent flow hydraulic system for crane and concurrent valve bank |
| CN102134047A (en) * | 2011-02-15 | 2011-07-27 | 安徽合力股份有限公司 | Energy-saving hydraulic system of electric forklift |
| CN202811582U (en) * | 2012-10-08 | 2013-03-20 | 北京索普液压机电有限公司 | Forklift hydraulic control system and forklift |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102900715A (en) | 2013-01-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102900715B (en) | Hydraulic control system for forklift, and forklift | |
| CN102862316B (en) | Press machine and hydraulic control system thereof | |
| CN201661532U (en) | Hydraulic pumping system of concrete pump | |
| CN103174687B (en) | Pressurized and energy storing type energy-saving hydraulic pumping unit | |
| CN102506030B (en) | Multi-way valve and tunnel boring machine | |
| CN202646195U (en) | Hydraulic pressurization system | |
| CN202116941U (en) | Hydraulic system of paper roll erecting machine | |
| CN203717551U (en) | Power unit of pallet truck | |
| CN202811582U (en) | Forklift hydraulic control system and forklift | |
| CN103771286B (en) | Multi-cylinder synchronous lifting mechanism | |
| CN108286540A (en) | A kind of hydraulic system of multifunction hydraulic workbench peculiar to vessel | |
| CN202326536U (en) | Circulation cleaning device for hydraulic unit | |
| CN201756385U (en) | Power pump station used for hydraulic elevator/hydraulic lift | |
| CN207961100U (en) | A kind of hydraulic control system of flap valve device | |
| CN114321050A (en) | Oil cylinder hydraulic system | |
| CN206257110U (en) | Integrated electric hydraulic hoist unit | |
| CN201425044Y (en) | Pneumatic reversing valve for dump trucks | |
| CN102556153B (en) | Steering hydraulic drive system for vehicle | |
| CN206257088U (en) | Integral electric storage car jack up unit | |
| CN203476858U (en) | Power pump station for diesel engine | |
| CN202483996U (en) | Cooling protection device for hydraulic reversing system | |
| CN202767158U (en) | Hydraulic excavator flow out of valve regenerating device | |
| CN102423521A (en) | Fire extinguishing system and fire engine containing the same | |
| CN102295199A (en) | Power pump station for hydraulic elevator/hydraulic lift | |
| CN205187744U (en) | Hydro -cylinder hydraulic drive system with prevent inhaling sky function |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |