CN102900715A - Hydraulic control system for forklift, and forklift - Google Patents
Hydraulic control system for forklift, and forklift Download PDFInfo
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- CN102900715A CN102900715A CN2012103781475A CN201210378147A CN102900715A CN 102900715 A CN102900715 A CN 102900715A CN 2012103781475 A CN2012103781475 A CN 2012103781475A CN 201210378147 A CN201210378147 A CN 201210378147A CN 102900715 A CN102900715 A CN 102900715A
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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 fork truck hydraulic control system and contain the fork truck of 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 be accomplished 45T, but complex structure, bulky.
Summary of the invention
Technical problem to be solved by this invention is, a kind of fork truck hydraulic control system is provided, and is simple in structure, reduces own wt when improving the lifting tonnage of fork truck, and can realize the large-scale stepless speed change.
In view of this, the invention provides a kind of fork truck hydraulic control system, comprise fuel tank, pump, control and drive second of described forklift lifting or decline and control branch road, also comprise control and drive the first control branch road that described fork truck advances or retreats; Flow to described the first control branch road and described the second control branch road after described pump is pressurizeed the hydraulic oil in the described fuel tank, the oil return of described the first control branch road and described the second control branch road is sent back in the described fuel tank by oil returning tube.
Adopt hydraulic system to drive the fork truck motion, can obtain larger power or moment, improved the lifting tonnage of fork truck; Fork truck operates steadily, and easily realizes the large-scale stepless speed change, the power loss when having reduced simultaneously speed change; Hydraulically powered mode has alleviated the weight of fork truck greatly, has prolonged the working life of each element because of the self-lubricating function of fluid, and environmental pollution is little, noise is low.
In technique scheme, preferably, described the first control branch road comprises the first selector valve and oil hydraulic motor, the pressure port of described the first selector valve is communicated with the outlet of described pump, two actuator ports of described the first selector valve are connected with two working holes of described oil hydraulic motor respectively, and the return opening of described the first selector valve is connected with described oil returning tube.
In this technological scheme, the rotation direction of the first selector valve control oil hydraulic motor, thus the control fork truck advances or retreats, and this mode is simple and practical; Oil hydraulic motor is compared with the motor of Same Efficieney, has greatly alleviated the weight of fork truck self, and oil hydraulic motor is compared with the motor of equal volume, has improved the lifting tonnage of fork truck; Employing hydraulic driving noise is low and environmental pollution is little.
In technique scheme, preferably, described the first control branch road also comprises reduction valve, and described reduction valve is arranged between the outlet of the described pressure hydraulic fluid port of described the first selector valve and described pump, is used for regulating the pressure of described the first control branch road hydraulic oil.
Between the first selector valve and pump reduction valve is set, pressure decreased to the first control spendable force value of branch road of the hydraulic oil that reduction valve can transfer out pump also makes this force value keep constant.Like this, the security incident of having avoided the first control branch road to cause because pressure is excessive.
In technique scheme, preferably, described the first selector valve is the 3-position 4-way solenoid directional control valve, and described reduction valve is direct acting pressure, and described 3-position 4-way solenoid directional control valve and described direct acting pressure adopt the mode of up and down stack to be installed together composition the first valve group.
In this technological scheme, the first selector valve is three position four-way directional control valve three kinds of working state-forwards having guaranteed oil hydraulic motor, reverse and stop, and namely drives fork truck and advances, retreats and stop; Direct acting pressure has guaranteed the constant pressure of pipeline, has further guaranteed the safety in utilization of hydraulic system.
In above-mentioned each technological scheme, preferably, described the second control branch road comprises the second selector valve, two Pilot operated check valves, two one-way throttle valves, two pressure relayes, multi-joint flow distributor, a plurality of the 3rd selector valve and a plurality of lifting hydraulic cylinders; The pressure hydraulic fluid port of described the second selector valve is connected with the outlet of described pump, return opening is communicated with described oil returning tube, the first actuator port of described the second selector valve is communicated with the rod chamber of a plurality of described lifting hydraulic cylinders behind a described Pilot operated check valve, a described one-way throttle valve successively, and a described pressure relay is installed on the pipeline between described one-way throttle valve and the described lifting hydraulic cylinder; The second actuator port of described the second selector valve is communicated with the rodless cavity of a plurality of described lifting hydraulic cylinders through another described Pilot operated check valve, another described one-way throttle valve, described multi-joint flow distributor and a plurality of described the 3rd selector valve successively, and another described pressure relay is installed on the pipeline between described one-way throttle valve and the described multi-joint flow distributor; The hydraulic control mouth of two described Pilot operated check valves consists of hydraulic lock with the corresponding connection of pipeline that described the second selector valve two actuator ports connect respectively, can make described lifting hydraulic cylinder rest on the arbitrary position; Two described pressure relayes are in order to detect the oil pressure in the corresponding pipeline and to be used for overpressure alarm, described multi-joint flow distributor is so that enter the flow of the hydraulic oil in each described lifting hydraulic cylinder and equate, described the 3rd selector valve is used 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 guarantee the pressure stability of lifting hydraulic cylinder, also can prevent the automatic downslide when lifting hydraulic cylinder stops to move simultaneously; Throttle valve can be regulated lifting hydraulic cylinder and rise and rate of descent, adjusts by the flow of throttle valve and can realize the large-scale stepless change adjusting of fork truck; Pressure relay can detect the pressure of pipeline, sends alarm signal when the force value that detects exceeds predefined value, has guaranteed the Security of the second control branch road; So that enter the flow of the hydraulic oil in each lifting hydraulic cylinder and equate, guarantee that forklift lifting or falling head are consistent by multi-joint flow distributor.
In technique scheme, preferably, described the second selector valve is the 3-position 4-way solenoid directional control valve, and two described one-way throttle valves, two described Pilot operated check valves and described 3-position 4-way solenoid directional control valve adopt the mode of upper, middle and lower stack to be installed together composition second valve group; Described multi-joint flow distributor is six gear wheel flow-rate distributors, described the 3rd selector valve is seat valve formula 2/2-way solenoid directional control valve, the outlet of each connection of described six gear wheel flow-rate distributors is communicated with a described seat valve formula 2/2-way solenoid directional control valve, two described lifting hydraulic cylinders of each described seat valve formula 2/2-way solenoid directional control valve control.
In this technological scheme, the second selector valve is three position four-way directional control valve three kinds of working state-liftings having guaranteed lifting hydraulic cylinder, descends, stops; The second valve group can guarantee the stepless change of the second control branch road realization forklift lifting, and the power loss when having reduced speed change has guaranteed that simultaneously fork truck operates steadily; The 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 be controlled the wherein on-off between an outlet of two lifting hydraulic cylinders and six gear wheel flow-rate distributors, when the second selector valve is in halted state, the 2/2-way solenoid valve places not on-state, and lifting hydraulic cylinder is remained 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 the fluid in the described fuel tank is pumped, and the pressure oil that pumps flows to described the first selector valve and described the second selector valve through described one-way valve, described high pressure filter successively; Described pressure regulator valve is arranged between the export pipeline and described oil returning tube of described one-way valve, is used for adjusting the pressure that described pump pumps hydraulic oil.
In this technological scheme, the one-way valve of setting can only make the fluid one-way flow, has prevented the reverse inflow pump group of high pressure oil; The high pressure filter that arranges can carry out the fluid that oil hydraulic pump is discharged essence and filter, and prevents impurity particle plugging fluid pressure valve, pollutes lifting hydraulic cylinder and oil hydraulic motor; The pressure regulator valve that arranges can be regulated the size of pump delivery pressure value.
In technique scheme, described oil hydraulic pump is high-pressure gear pump, and described high pressure filter is with blocking alarming relay, and described pressure regulator valve is direct-acting overflow valve, and the pressure after the adjustment can show by the shock-proof pressure gauge that is arranged on the pipeline.
In this technological scheme, high pressure filter is furnished with the obstruction alarming relay, when high pressure filter stops up, blocks alarming relay and sends signal, and the prompting staff in time clears up, and has guaranteed the Security that hydraulic system is used; Regulate the size of pump group delivery pressure by the knob of adjusting direct-acting overflow valve, it should be noted that the highest adjusting pressure must not be greater than the pressure of default, and the pressure after adjusting must lock.
In technique scheme, preferably, the level meter that also is provided with hydraulic air filter on the described fuel tank and shows with temperature, described hydraulic air filter both can purify the air that described fuel tank sucks and also can be used for refueling, and the height of the described described oil tank liquid level of level meter observable that shows with temperature also can show the temperature of fluid.
In this technological scheme, when hydraulic work system, in the fuel tank during liquid level and when rising and descending, can filter by the air of discharging to the external world in the fuel tank or the air that sucked in the fuel tank by the external world by hydraulic air filter, namely the air that sucks is carried out dedusting, make the fuel tank inner fluid not be subjected to the pollution of impurity in the air; In addition, hydraulic work system is of long duration to have fluid consumption, and hydraulic air filter can be used as oil filler, replenishes the fluid that consumes, sufficient to guarantee the fuel tank inner fluid; Glass vision panel by level meter can be observed the height of liquid level in the fuel tank easily, can add timely fluid when not enough with convenient fluid, level meter shows with temperature, can when observing height of liquid level, learn intuitively the temperature of fluid, can in time take measures when too high with convenient oil liquid temperature fluid is cooled off.
The present invention also provides a kind of fork truck, comprises the described fork truck hydraulic control system of above-mentioned arbitrary technological scheme.Obviously, this fork truck has whole beneficial effects of above-mentioned fork truck hydraulic control system, do not repeat them here, but its application all should be within protection scope of the present invention.
In sum, fork truck hydraulic control system provided by the invention has been saved the space, adopts hydraulic system to drive the fork truck motion, can obtain larger power or moment, has improved the lifting tonnage of fork truck; Fork truck operates steadily, and easily realizes the large-scale stepless speed change, the power loss when having reduced simultaneously speed change; Hydraulically powered mode has alleviated the weight of fork truck greatly, has prolonged the working life of each element because of the self-lubricating function of fluid, and environmental pollution is little, noise is low.
Description of drawings
Fig. 1 is the schematic diagram according to fork truck hydraulic control system one embodiment of the present invention.
Wherein, the corresponding relation between reference character and the component names is among Fig. 1:
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, 20 level meters with the temperature demonstration, 21 first valve groups, 22 second valve groups.
Embodiment
In order more clearly to 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.Need to prove, in the situation that do not conflict, the application's embodiment and the feature among the embodiment can make up mutually.
A lot of details have been set forth 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 and implement, and therefore, protection scope of the present invention is not subjected to the restriction of following public specific embodiment.
Fig. 1 is the schematic diagram according to fork truck hydraulic control system one embodiment of the present invention.
As shown in Figure 1, the invention provides a kind of fork truck hydraulic control system, comprise fuel tank 1, pump, control and drive second of forklift lifting or decline and control branch road, also comprise control and drive the first control branch road that fork truck advances or retreats; Flow to the first control branch road and the second control branch road after pump is pressurizeed the hydraulic oil in the fuel tank 1, the oil return of the first control branch road and the second control branch road is sent back in the fuel tank 1 by oil returning tube 19.
Adopt hydraulic system to drive the fork truck motion, can obtain larger power or moment, improved the lifting tonnage of fork truck; Fork truck operates steadily, and easily realizes the large-scale stepless speed change, the power loss when having reduced simultaneously speed change; Hydraulically powered mode has alleviated the weight of fork truck greatly, has prolonged the working life of each element because of the self-lubricating function of fluid, and environmental pollution is little, noise is low.
In the above-described embodiments, the first control branch road comprises the first selector valve 10 and oil hydraulic motor 11, the pressure port of the first selector valve 10 is communicated with 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 control oil hydraulic motor, thereby the control fork truck advances or retreats, and this mode is simple and practical; Oil hydraulic motor is compared with the motor of Same Efficieney, has greatly alleviated the weight of fork truck self, and oil hydraulic motor is compared with the motor of equal volume, has improved the lifting tonnage of fork truck; Employing hydraulic driving noise is low and environmental pollution is little.
In the above-described embodiments, the first control branch road also comprises reduction valve 9, and reduction valve 9 is arranged between the outlet of the pressure hydraulic fluid port of the first selector valve 10 and pump, is used for regulating the pressure of the first control branch road hydraulic oil.
Between the first selector valve and pump reduction valve is set, pressure decreased to the first control spendable force value of branch road of the hydraulic oil that reduction valve can transfer out pump also makes this force value keep constant.Like this, the security incident of having avoided the first control branch road to cause because pressure is excessive.
In the above-described embodiments, the first selector valve 10 is the 3-position 4-way solenoid directional control valve, and reduction valve 9 is direct acting pressure, and 3-position 4-way solenoid directional control valve and direct acting pressure adopt the mode of up and down stack to be installed together composition the first valve group 21.
In this technological scheme, the first selector valve is three position four-way directional control valve three kinds of working state-forwards having guaranteed oil hydraulic motor, reverse and stop, and can drive fork truck and can advance, retreats and stop; Direct acting pressure has guaranteed the constant pressure of pipeline, has further guaranteed the safety in utilization of hydraulic system.
In above-mentioned arbitrary embodiment, the second control branch road 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, a plurality of the 3rd selector valve 13 and a plurality of lifting hydraulic cylinders 12; The pressure hydraulic fluid port of the second selector valve 18 is connected with the outlet of pump, return opening is communicated with oil returning tube 19, the first actuator port of the second selector valve 18 is communicated with the rod chamber of a plurality of lifting hydraulic cylinders 12 behind a Pilot operated check valve 17, an one-way throttle valve 16 successively, and a pressure relay 15 is installed on the pipeline between one-way throttle valve 16 and the lifting hydraulic cylinder 12; The second actuator port of the second selector valve 18 is communicated with the rodless cavity of a plurality of lifting hydraulic cylinders 12 through another Pilot operated check valve 17, another one-way throttle valve 16, multi-joint flow distributor and a plurality of the 3rd selector valve 13 successively, and another pressure relay 15 is installed on the pipeline between one-way throttle valve 16 and the multi-joint flow distributor; The hydraulic control mouth of two Pilot operated check valves 17 consists of hydraulic lock with the corresponding connection of pipeline that 18 liang of actuator ports of the second selector valve connect respectively, can make described lifting hydraulic cylinder 12 rest on the arbitrary position; Oil pressure also is used for overpressure alarm to two pressure relayes 15 in the corresponding pipeline in order to detect, multi-joint flow distributor is so that enter the flow of the hydraulic oil in each lifting hydraulic cylinder 12 and equate, the 3rd selector valve 13 is used 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 guarantee the pressure stability of lifting hydraulic cylinder, also can prevent the automatic downslide when lifting hydraulic cylinder stops to move simultaneously; Throttle valve can be regulated lifting hydraulic cylinder and rise and rate of descent, adjusts by the flow of throttle valve and can realize the large-scale stepless change adjusting of fork truck; Pressure relay can detect the pressure of pipeline, sends alarm signal when the force value that detects exceeds predefined value, has guaranteed the Security of the second control branch road; So that enter the flow of the hydraulic oil in each lifting hydraulic cylinder and equate, guarantee that forklift lifting or falling head are consistent by multi-joint flow distributor.
In the above-described embodiments, the second selector valve 18 is the 3-position 4-way solenoid directional control valve, and two one-way throttle valves 16, two Pilot operated check valves 17 and 3-position 4-way solenoid directional control valve adopt the mode of upper, middle and lower stack to be installed together composition second valve group 22; Multi-joint flow distributor is six gear wheel flow-rate distributors 14, the 3rd selector valve 13 is seat valve formula 2/2-way solenoid directional control valve, the outlet of each connection of six gear wheel flow-rate distributors 14 is communicated with a seat valve formula 2/2-way solenoid directional control valve, two lifting hydraulic cylinders 12 of each seat valve formula 2/2-way solenoid directional control valve control.
In this technological scheme, the second selector valve is three position four-way directional control valve three kinds of working state-liftings having guaranteed lifting hydraulic cylinder, stops, descending; The second valve group can guarantee the stepless change of the second control branch road realization forklift lifting, and the power loss when having reduced speed change has guaranteed that simultaneously fork truck operates steadily; The 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 be controlled the wherein on-off between an outlet of two lifting hydraulic cylinders and six gear wheel flow-rate distributors, when the second selector valve is in halted state, the 2/2-way solenoid valve places not on-state, can make lifting hydraulic cylinder 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 the fluid in the fuel tank 1 is pumped, and the pressure oil that pumps 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 and oil returning tube 19 of one-way valve 6, is used for adjusting the pressure that pump pumps hydraulic oil.
In this technological scheme, the one-way valve of setting can only make the fluid one-way flow, has prevented the reverse inflow pump group of high pressure oil; The high pressure filter that arranges can carry out the fluid that oil hydraulic pump is discharged essence and filter, and prevents impurity particle plugging fluid pressure valve, pollutes lifting hydraulic cylinder and oil hydraulic motor; The pressure regulator valve that arranges can be regulated the size of pump group delivery pressure value.
In the above-described embodiments, preferably, oil hydraulic pump is high-pressure gear pump 5, and high pressure filter 8 is with blocking alarming relay, and pressure regulator valve is direct-acting overflow valve 2, and the pressure after the adjustment can show by the shock-proof pressure gauge 7 that is arranged on the pipeline.
In this technological scheme, high pressure filter is furnished with the obstruction alarming relay, when high pressure filter stops up, blocks alarming relay and sends signal, and the prompting staff in time clears up, and has guaranteed the Security that hydraulic system is used; Regulate the size of pump group delivery pressure by the knob of adjusting direct-acting overflow valve, it should be noted that the highest adjusting pressure must not be greater than the pressure of default, and the pressure after adjusting must lock.
In the above-described embodiments, the level meter 20 that also is provided with hydraulic air filter 3 on the fuel tank 1 and shows with temperature, hydraulic air filter 3 both can purify the air that fuel tank 1 sucks and also can be used for refueling, and the height of level meter 20 observable fuel tanks 1 liquid level that shows with temperature also can show the temperature of fluid.
In this technological scheme, when hydraulic work system, in the fuel tank during liquid level and when rising and descending, can filter by the air of discharging to the external world in the fuel tank or the air that sucked in the fuel tank by the external world by hydraulic air filter, namely the air that sucks is carried out dedusting, make the fuel tank inner fluid not be subjected to the pollution of impurity in the air; In addition, hydraulic work system is of long duration to have fluid consumption, and hydraulic air filter can be used as oil filler, replenishes the fluid that consumes, sufficient to guarantee the fuel tank inner fluid; Glass vision panel by level meter can be observed the height of liquid level in the fuel tank easily, can add timely fluid when not enough with convenient fluid, level meter shows with temperature, can when observing height of liquid level, learn intuitively the temperature of fluid, can in time take measures when too high with convenient oil liquid temperature fluid is cooled off.
The present invention also provides a kind of fork truck, comprises the described fork truck hydraulic control system of above-mentioned arbitrary technological scheme.Obviously, this fork truck has whole beneficial effects of above-mentioned fork truck hydraulic control system, do not repeat them here, but its application all should be within protection scope of the present invention.
As shown in Figure 1, the fork truck hydraulic control system mainly is made of fuel tank 1, pump, the first control branch road and the second control branch road etc., and the working principle of its hydraulic control system is:
Pump is comprised 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 sucking the oil sucting cavity of high-pressure gear pump 5, the fluid of oil sucting cavity is along with the rotation of pump is discharged by pressure oil cavity with the hydraulic oil in the fuel tank 1; The fluid of discharging filters the high pressure filter 8 that stops up warning function through one-way valve 6, band and arrives the first control branch road and the second control branch road, the pressure value P of pump group output this moment 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 can show by shock-proof pressure gauge 7.
Wherein, band filters the high pressure filter 8 that stops up warning function, will carry out from the fluid that high-pressure gear pump 5 is discharged smart filtration first time, prevents impurity particle plugging fluid pressure valve, pollutes lifting hydraulic cylinder 12 and oil hydraulic motor 11.This high pressure filter 8 is with the plugged filter warning function; Direct-acting overflow valve 2 by adjusting direct-acting overflow valve 2 knobs, can regulate the size of pump group delivery pressure P value, but the highest adjusting pressure must not be greater than default pressure, and the pressure after the adjustment must lock; One-way valve 6 can only make the fluid one-way flow, prevents the reverse inflow pump group of high pressure oil.
Fork truck control minute two-way: the first control branch road that advances with retreat of the radial piston hydraulic motor 11 of one tunnel control forklift-walking; The second control branch road of the lifting of another road operating console forklift lifting oil hydraulic cylinder 12 and decline.
The first control branch road is comprised of oil hydraulic motor 11, reduction valve 9, the first selector valve 10.Wherein, the first selector valve 10 is the 3-position 4-way solenoid directional control valve, and consists of the first valve group 21 with reduction valve 9 with the form that superposes up and down.By regulating the knob of reduction valve 9, can obtain to be lower than any pressure value P 1 of system pressure P, this pressure value P 1 is determined by radial piston hydraulic motor 11 required actual torques.When the electromagnet at the first selector valve 10 two ends is not all switched on, the first selector valve 10 is in interposition, this moment, pressure hydraulic fluid port and return opening, the first actuator port, the second actuator port were all obstructed, hydraulic oil can be got back to fuel tank 1 by oil returning tube 19 from the first actuator port, the second actuator port and return opening, and this moment, oil hydraulic motor 11 was failure to actuate.When the left side electromagnet of the first selector valve 10 gets electricly, during the electromagnet dead electricity of right side, the first selector valve 10 is in and intersects the position, and this moment, the pressure hydraulic fluid port was 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 oil hydraulic motor 11 left chambeies flows back to fuel tank 1 through oil returning tube 19 again through the first actuator port of the first selector valve 10-return opening, and pressure oil drove oil hydraulic motor 11 and turned clockwise this moment.When the energising of the right side of the first selector valve 10 electromagnet, during the electromagnet dead electricity of left side, the first selector valve 10 is in parallel position, and this moment, the pressure hydraulic fluid port was 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 of the first selector valve 10-return opening, and pressure oil drove oil hydraulic motor 11 and was rotated counterclockwise this moment.
Lifting and the decline of the second control branch road operating console forklift lifting oil hydraulic cylinder 12.
This route second selector valve 18, two Pilot operated check valves 17, two one-way throttle valves 16, two pressure relayes 15, six gear wheel flow-rate distributors 14, six seat valve formula the 3rd selector valves 13 and 12 lifting hydraulic cylinders 12 form; The second selector valve 18 and two Pilot operated check valves 17 and two one-way throttle valves 16 form second valve group 22 with the form of upper, middle and lower stack; The first actuator port of second valve group 22 directly links to each other with the rod chamber of 12 lifting hydraulic cylinders 12 by pipeline; And the second actuator port of second valve group 22 is introduced into the first actuator port of six gear wheel flow-rate distributors 14, six gear wheel flow-rate distributors 14 are divided into six parts with the hydraulic oil that enters, 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 switched on simultaneously, namely be in on-state, three selector valve 13 of hydraulic oil after connecting enters respectively the rodless cavity of 12 lifting hydraulic cylinders 12.When the electromagnet of the second selector valve 18 both sides is not all switched on, the second selector valve 18 position that mediates, this moment, the pressure hydraulic fluid port of the second selector valve 18 and the first actuator port, the second actuator port, return opening were all obstructed, hydraulic oil can flow back to fuel tank 1 by oil returning tube 19 from the first actuator port, the second actuator port and return opening, and this moment, 12 lifting hydraulic cylinders 12 were failure to actuate.When the electromagnet in the second selector valve 18 left sides gets electricly, during the electromagnet dead electricity on right side, the second selector valve 18 is in and intersects the position, and this moment, the pressure hydraulic fluid port was 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 behind 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 of the second selector valve 18-return opening through oil returning tube 19, and this moment, 12 lifting hydraulic cylinder 12 piston rods stretched out forklift lifting.When the energising of the electromagnet on the second selector valve 18 right sides, during the electromagnet dead electricity in left side, the second selector valve 18 is in parallel position, and this moment, the pressure hydraulic fluid port was 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 hydraulic fluid 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, enter again the second actuator port of the second selector valve 18-return opening through the second actuator port of six gear wheel flow-rate distributors 14 and flow back to fuel tank 1 through oil returning tube 19 again; This moment, pressure oil drove 12 declines of 12 lifting hydraulic cylinders.
Wherein, the second selector valve 18 is the 3-position 4-way solenoid directional control 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 the function of regulating 12 risings of fork truck lifting hydraulic cylinder and rate of descent; Pilot operated check valve 17 has pressure holding function; Pressure relay 15 has overpressure alarm function.
In sum, fork truck hydraulic control system provided by the invention can be saved the space, adopts hydraulic system to drive the fork truck motion, can obtain larger power or moment, has improved the lifting tonnage of fork truck; Fork truck operates steadily, and easily realizes the large-scale stepless speed change, the power loss when having reduced simultaneously speed change; Hydraulically powered mode has alleviated the weight of fork truck greatly, has prolonged the working life of each element because of the self-lubricating function of fluid, and environmental pollution is little, noise is low.
In the present invention, term " first ", " second ", " the 3rd " only are used for the purpose of description, and can not be interpreted as indication or hint relative importance; Unless clear and definite regulation and restriction are arranged in addition.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and 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 modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a fork truck hydraulic control system comprises fuel tank (1), pump, control and drives second of described forklift lifting or decline and controls branch road, it is characterized in that, also comprises control and drives the first control branch road that described fork truck advances or retreats; Flow to described the first control branch road and described the second control branch road after described pump is pressurizeed the hydraulic oil in the described fuel tank (1), the oil return of described the first control branch road and described the second control branch road is sent back in the described fuel tank (1) by oil returning tube (19).
2. fork truck hydraulic control system according to claim 1, it is characterized in that, described the first control branch road comprises the first selector valve (10) and oil hydraulic motor (11), the pressure port of described the first selector valve (10) is communicated with the outlet of described pump, two actuator ports of described the first selector valve (10) are connected with two working holes of described oil hydraulic motor (11) respectively, and the return opening of described the first selector valve (10) is connected with described oil returning tube (19).
3. fork truck hydraulic control system according to claim 2, it is characterized in that, described the first control branch road also comprises reduction valve (9), described reduction valve (9) is arranged between the outlet of the described pressure hydraulic fluid port of described the first selector valve (10) and described pump, is used for regulating the pressure of described the first control branch road hydraulic oil.
4. fork truck hydraulic control system according to claim 3, it is characterized in that, described the first selector valve (10) is the 3-position 4-way solenoid directional control valve, described reduction valve (9) is direct acting pressure, and described 3-position 4-way solenoid directional control valve and described direct acting pressure adopt the mode of up and down stack to be installed together composition the first valve group (21).
5. each described fork truck hydraulic control system in 4 according to claim 1, it is characterized in that, described the second control branch road 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, a plurality of the 3rd selector valve (13) and a plurality of lifting hydraulic cylinder (12);
The pressure hydraulic fluid port of described the second selector valve (18) is connected with the outlet of described pump, return opening is communicated with described oil returning tube (19), the first actuator port of described the second selector valve (18) is communicated with the rod chamber of a plurality of described lifting hydraulic cylinders (12) behind a described Pilot operated check valve (17), a described one-way throttle valve (16) successively, and a described pressure relay (15) is installed on the pipeline between described one-way throttle valve (16) and the described lifting hydraulic cylinder (12); The second actuator port of described the second selector valve (18) is communicated with the rodless cavity of a plurality of described lifting hydraulic cylinders (12) through another described Pilot operated check valve (17), another described one-way throttle valve (16), described multi-joint flow distributor and a plurality of described the 3rd selector valves (13) successively, and another described pressure relay (15) is installed on the pipeline between described one-way throttle valve (16) and the described multi-joint flow distributor;
The hydraulic control mouth of two described Pilot operated check valves (17) consists of hydraulic lock with the corresponding connection of pipeline that described the second selector valve (18) two actuator ports connect respectively, can make described lifting hydraulic cylinder (12) rest on the arbitrary position; Two described pressure relayes (15) are in order to detect the oil pressure in the corresponding pipeline and to be used for overpressure alarm, described multi-joint flow distributor is so that enter the flow of the hydraulic oil in each described lifting hydraulic cylinder (12) and equate, described the 3rd selector valve (13) is used for controlling the on-off of described multi-joint flow distributor and described lifting hydraulic cylinder (12).
6. fork truck hydraulic control system according to claim 5, it is characterized in that, described the second selector valve (18) is the 3-position 4-way solenoid directional control valve, and two described one-way throttle valves (16), two described Pilot operated check valves (17) and described 3-position 4-way solenoid directional control valve adopt the mode of upper, middle and lower stack to be installed together composition second valve group (22); Described multi-joint flow distributor is six gear wheel flow-rate distributors (14), described the 3rd selector valve (13) is seat valve formula 2/2-way solenoid directional control valve, the outlet of each connection of described six gear wheel flow-rate distributors (14) is communicated with a described seat valve formula 2/2-way solenoid directional control valve, each described seat valve formula 2/2-way solenoid directional control valve control two described lifting hydraulic cylinder (12).
7. fork truck hydraulic control system according to claim 5 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 the fluid in the described fuel tank (1) is pumped, and the pressure oil that pumps flows to described the first selector valve (10) and described the 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 and described oil returning tube (19) of described one-way valve (6), is used for adjusting the pressure that described pump pumps hydraulic oil.
8. want 7 described fork truck hydraulic control systems according to right, it is characterized in that, described oil hydraulic pump is high-pressure gear pump (5), described high pressure filter (8) is with blocking alarming relay, described pressure regulator valve is direct-acting overflow valve (2), and the pressure after the adjustment can show by the shock-proof pressure gauge (7) that is arranged on the pipeline.
9. want 7 described fork truck hydraulic control systems according to right, it is characterized in that, the level meter (20) that also is provided with hydraulic air filter (3) on the described fuel tank (1) and shows with temperature, 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 the described described fuel tank of level meter (20) observable (1) liquid level that shows with temperature also can show the temperature of fluid.
10. a fork truck is characterized in that, comprises such as each described fork truck hydraulic control system in the claim 1 to 9.
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| CN201210378147.5A CN102900715B (en) | 2012-10-08 | 2012-10-08 | Hydraulic control system for forklift, and forklift |
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| CN201210378147.5A CN102900715B (en) | 2012-10-08 | 2012-10-08 | Hydraulic control system for forklift, and forklift |
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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 |
Cited By (20)
| 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 |
| 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 |
| 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 |
| 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 |
| CN106050779A (en) * | 2016-07-18 | 2016-10-26 | 江苏恒立液压科技有限公司 | Multi-way valve of forklift |
| 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 |
| CN106856794A (en) * | 2017-02-14 | 2017-06-20 | 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 |
| CN108316936A (en) * | 2018-03-13 | 2018-07-24 | 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 |
| CN108910789A (en) * | 2018-09-28 | 2018-11-30 | 邵延荣 | Control valve group and electric forklift hydraulic system for electric forklift hydraulic system |
| 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 |
| CN112594239A (en) * | 2020-12-24 | 2021-04-02 | 天津市天锻压力机有限公司 | Hydraulic control system for jaw of skin stretching hydraulic machine |
| 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 |
| CN114394490A (en) * | 2021-12-25 | 2022-04-26 | 山东泰开汽车制造有限公司 | Cable reeling and unreeling trolley device used in narrow and complex channel and using method |
| 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 |
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