CN209778220U - forward-moving forklift hydraulic system - Google Patents
forward-moving forklift hydraulic system Download PDFInfo
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- CN209778220U CN209778220U CN201920587839.8U CN201920587839U CN209778220U CN 209778220 U CN209778220 U CN 209778220U CN 201920587839 U CN201920587839 U CN 201920587839U CN 209778220 U CN209778220 U CN 209778220U
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Abstract
the utility model discloses an antedisplacement formula fork truck hydraulic system can solve antedisplacement formula fork truck and when giving the oil feed of forward and backward movement hydro-cylinder and tilt cylinder, motor and oil pump work in low rotational speed district, and work efficiency is low, plays to rise the poor technical problem of fine motion performance. The large-displacement oil pump motor controller controls a large-displacement oil pump motor to work, and the small-displacement oil pump motor controller controls a small-displacement oil pump motor to work; the large-displacement oil pump motor controller and the small-displacement oil pump motor controller are respectively in communication connection with the valve controller through a CAN bus; the valve controller is respectively in communication connection with a lifting thumb switch, a forward and backward movement thumb switch and an inclined thumb switch of the forward type forklift. The utility model discloses an antedisplacement formula fork truck hydraulic system adopts the little discharge capacity oil pump to supply oil alone for front and back hydro-cylinder and the slope hydro-cylinder, and work efficiency is high, and the energy saving when rising the fine motion operation simultaneously, adopts little discharge capacity oil pump fuel feeding, and the fine motion performance is good.
Description
Technical Field
The utility model relates to a fork truck hydraulic system technical field, concretely relates to antedisplacement formula fork truck hydraulic system.
background
The forward fork truck adopts a single pump to supply oil to the lifting oil cylinder, the forward and backward moving oil cylinder and the inclined oil cylinder, and has the following problems: because the flow demand of the forward and backward moving oil cylinder and the inclined oil cylinder is smaller relative to the lifting oil cylinder, when oil is supplied to the forward and backward moving oil cylinder and the inclined oil cylinder, the motor and the oil pump work in a low rotating speed area, the working efficiency is low, the heat productivity of the system is large, and energy is wasted; in order to meet the requirement of lifting performance, the displacement of the oil pump is relatively large, so that when the lifting jogging operation is caused, the rotating speeds of the motor and the oil pump are extremely low, the motor and the oil pump work unstably, and the jogging performance is poor.
SUMMERY OF THE UTILITY MODEL
the utility model provides a pair of antedisplacement formula fork truck hydraulic system can solve antedisplacement formula fork truck and when giving the oil feed of antedisplacement hydro-cylinder and tilt cylinder, motor and oil pump work in low rotational speed district, and work efficiency is low, plays to rise to move about the poor technical problem of performance.
in order to achieve the above purpose, the utility model adopts the following technical scheme:
a hydraulic system of a forward forklift comprises a hydraulic oil tank based on the forward forklift, wherein an oil pump is arranged in the hydraulic oil tank and is communicated with an oil cylinder through a pipeline, the oil cylinder comprises a tilting oil cylinder, a forward and backward moving oil cylinder, a left lifting oil cylinder and a right lifting oil cylinder, the oil pump comprises a large-displacement oil pump and a small-displacement oil pump, an oil outlet pipeline of the large-displacement oil pump is respectively communicated with the left lifting oil cylinder and the right lifting oil cylinder, and the small-displacement oil pump is respectively communicated with the tilting oil cylinder, the forward and backward moving oil cylinder, the left lifting oil cylinder and the right lifting oil cylinder;
the large-displacement oil pump is connected with a large-displacement oil pump motor, and the small-displacement oil pump is connected with a small-displacement oil pump motor;
The large-displacement oil pump motor controller controls the large-displacement oil pump motor to work, and the small-displacement oil pump motor controller controls the small-displacement oil pump motor to work;
The large-displacement oil pump motor controller and the small-displacement oil pump motor controller are respectively in communication connection with the valve controller through a CAN bus;
the valve controller is respectively in communication connection with a lifting thumb switch, a forward and backward movement thumb switch and an inclined thumb switch of the forward type forklift.
According to the above technical scheme, the utility model discloses an antedisplacement formula fork truck hydraulic system has following beneficial effect:
the utility model discloses a two pump oil feeding system, when the fork normally rises, big discharge hydraulic oil pump guarantees that fork lifting speed meets the requirements for lift cylinder (left lift cylinder and right lift cylinder) fuel feeding. When the pallet fork is lifted by micro motion, the small-displacement oil pump supplies oil to the lifting oil cylinders (the left lifting oil cylinder and the right lifting oil cylinder), and the micro motion performance is good.
when the fork inclines and the portal moves forwards and backwards, the small displacement pump supplies oil to the inclined oil cylinder and the forwards and backwards moving oil cylinder, the matching of the oil cylinder demand flow and the oil pump supply flow is realized, the working efficiency is high, and the energy is saved.
drawings
Fig. 1 is a schematic structural diagram of the present invention;
fig. 2 is a schematic structural diagram of the control part of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention.
As shown in fig. 1, in the hydraulic system of the reach forklift truck according to the present embodiment, based on a hydraulic oil tank 1 of the reach forklift truck, an oil pump is arranged in the hydraulic oil tank 1, the oil pump is communicated with oil cylinders through pipelines, the oil cylinders include a tilt oil cylinder 11, a forward and backward movement oil cylinder 13, a left lift oil cylinder 15 and a right lift oil cylinder 16, wherein the oil pump includes a large displacement oil pump 3 and a small displacement oil pump 6, an oil inlet pipeline of the large displacement oil pump 3 is respectively communicated with the left lift oil cylinder 15 and the right lift oil cylinder 16, and the small displacement oil pump 6 is respectively communicated with the tilt oil cylinder 11, the forward and backward movement oil cylinder 13, the left lift oil cylinder 15;
The large-displacement oil pump 3 is connected with the large-displacement oil pump motor 2, and the small-displacement oil pump 6 is connected with the small-displacement oil pump motor 5; the motor controller of the large-displacement oil pump adopts the product of the Italy ZAPI company, and the model is as follows: ACE2-350, rated voltage: 48V, maximum current (2min) is 350A; the motor controller of the small-displacement oil pump adopts the product and the model number of the Italy ZAPI company: ACE2-350, rated voltage: 48V, maximum current (2min) is 350A; the valve controller was manufactured by ZAPI corporation, Italy, model number: VCM-2, output voltage: 12V and 2A of output current.
the large-displacement oil pump motor controller 33 controls the large-displacement oil pump motor 2 to work, and the small-displacement oil pump motor controller 41 controls the small-displacement oil pump motor 5 to work;
The large-displacement oil pump motor controller 33 and the small-displacement oil pump motor controller 41 are respectively in communication connection with the valve controller 34 through a CAN bus;
the valve controller 34 is respectively connected with the lifting thumb switch 21, the forward and backward moving thumb switch 25 and the tilting thumb switch 29 of the forward type forklift in a communication mode.
the lifting thumb switch 21 comprises a lifting potentiometer 22, a lifting switch 23 and a descending switch 24, and the lifting potentiometer 22, the lifting switch 23 and the descending switch 24 are respectively connected with a valve controller 34.
The tilt thumb switch 29 comprises a tilt potentiometer 30, a forward tilt switch 31 and a backward tilt switch 32; the tilt potentiometer 30, the forward tilt switch 31, and the backward tilt switch 32 are connected to a valve controller 34, respectively.
The forward and backward movement thumb switch 25 comprises a forward and backward movement potentiometer 26, a forward movement switch 27 and a backward movement switch 28; the forward and backward potentiometer 26, the forward switch 27 and the backward switch 28 are connected to a valve controller 34, respectively.
Specifically, the device further comprises a two-position two-way lifting electromagnetic valve 19, wherein an A5 port of the two-position two-way lifting electromagnetic valve 19 is respectively connected with the large-displacement oil pump 3 and the small-displacement oil pump 6 through hydraulic oil pipes;
The port B5 of the two-position two-way lifting electromagnetic valve 19 is respectively connected with the left lifting oil cylinder 15 and the right lifting oil cylinder 16 through hydraulic oil pipes;
The two-position two-way lifting electromagnetic valve 19 is provided with a switching electromagnetic valve which comprises an electromagnet m6 and is connected with the valve controller 34.
the lifting device also comprises a two-position two-way descending electromagnetic valve 8, wherein an A3 port of the two-position two-way descending electromagnetic valve 8 is respectively connected with the left lifting oil cylinder 15 and the right lifting oil cylinder 16 through hydraulic oil pipes;
the port B3 of the two-position two-way descending electromagnetic valve 8 is connected with the hydraulic oil tank 1 through a hydraulic oil pipe;
The two-position two-way descending solenoid valve 8 is provided with a proportional solenoid valve comprising an electromagnet m5 which is connected with the valve controller 34.
The three-position four-way forward electromagnetic valve 9 is characterized by further comprising a three-position four-way forward electromagnetic valve 9, wherein an A2 port of the three-position four-way forward electromagnetic valve 9 is respectively connected with the large displacement oil pump 3 and the small displacement oil pump 6 through hydraulic oil pipes;
the port B2 of the three-position four-way forward moving electromagnetic valve 9 is also connected with the hydraulic oil tank 1 through a hydraulic oil pipe;
the three-position four-way forward solenoid valve 9 is also connected with a forward and backward moving oil cylinder 13 through a hydraulic oil pipe;
the three-position four-way forward moving electromagnetic valve 9 is provided with a switching electromagnetic valve comprising an electromagnet m3 and an electromagnetic valve m4, and the electromagnet m3 and the electromagnetic valve m4 are respectively connected with a valve controller 34.
the three-position four-way inclination electromagnetic valve 10 is characterized by further comprising a three-position four-way inclination electromagnetic valve 10, wherein an A1 port of the three-position four-way inclination electromagnetic valve 10 is respectively connected with the large-displacement oil pump 3 and the small-displacement oil pump 6 through hydraulic oil pipes;
the port B1 of the three-position four-way inclined solenoid valve 10 is connected with the hydraulic oil tank 1 through a hydraulic oil pipe;
The ports C1 and D1 of the three-position four-way tilting electromagnetic valve 10 are connected with the tilting oil cylinder 11 through hydraulic oil pipes;
The three-position four-way tilting solenoid valve 10 is provided with a switching solenoid valve comprising a solenoid m1 and a solenoid m2, wherein the solenoid m1 and the solenoid m2 are respectively connected with a valve controller 34.
Wherein the embodiment of the utility model provides a control method as follows:
The lifting potentiometer 22 outputs voltage signals C9 with different magnitudes along with different positions of the lifting thumb switch 21, and the variation range is as follows: 0-5V, the lifting switch 23 and the descending switch 24 output switch signals C8 and C7 with different positions of the lifting thumb switch 21, and the values of the switch signals are 0 or 1; the back and forth potentiometer 26 outputs voltage signals C6 with different magnitudes according to the position of the back and forth thumb switch 25, and the variation range is as follows: 0-5V, the forward switch 27 and the backward switch 28 output switch signals C5 and C4 with different positions along with the forward and backward thumb switch 25, and the values of the switch signals are 0 or 1; the tilt potentiometer 30 outputs a voltage signal C3 with different magnitudes according to the position of the tilt thumb switch 29, and the variation range is as follows: 0-5V, the forward tilt switch 31 and the backward tilt switch 32 output switch signals C2 and C1 with different positions of the tilt thumb switch 29, and the values of the switch signals are 0 or 1.
The method comprises the following steps:
(1) Presetting voltage signal threshold values of Cy 1-2.35V, Cy 2-2.49V, Cy 3-2.51V and Cy 4-5V and storing the voltage signal threshold values in a valve controller 34;
(2) When the valve controller 34 detects that 0< C9< Cy1 and C8 is equal to 1, the large-displacement oil pump motor controller 33 controls the large-displacement oil pump motor 2 to work, and the motor speed is increased as the voltage signal of C9 is reduced; meanwhile, the valve controller 34 controls the electromagnet m6 to be electrified, so that oil is supplied by the large-discharge oil pump, and the fork is normally lifted.
(3) When the valve controller 34 detects that Cy1< C9< Cy2 and C8 is 1, the small displacement oil pump motor controller 41 controls the small oil pump motor 5 to work, and the motor speed is a fixed value (700 rpm); meanwhile, the valve controller 34 controls the electromagnet m6 to be electrified, so that oil is supplied by the small-displacement oil pump, and the fork is lifted slightly.
(4) When the valve controller 34 detects that 0< C6< Cy2 and C5 is equal to 1, the small displacement oil pump motor controller 41 controls the small oil pump motor 5 to work, and the motor speed increases as the voltage signal of C5 decreases; meanwhile, the valve controller 34 controls the electromagnet m4 to be electrified, so that oil supply of the small-displacement oil pump is realized, and the gantry moves forwards.
(5) when the valve controller 34 detects that Cy3< C6< Cy4 and C4 is 1, the small displacement oil pump motor controller 41 controls the small oil pump motor 5 to operate, and the motor speed increases as the voltage signal of C6 increases; meanwhile, the valve controller 34 controls the electromagnet m3 to be electrified, so that oil supply of the small-displacement oil pump is realized, and the gantry moves backwards.
(6) When the valve controller 34 detects that 0< C3< Cy2 and C2 is equal to 1, the small displacement oil pump motor controller 41 controls the small oil pump motor 5 to work, and the motor speed increases as the voltage signal of C3 decreases; meanwhile, the valve controller 34 controls the electromagnet m1 to be electrified, so that oil supply of the small-displacement oil pump is realized, and the gantry tilts forwards.
(7) when the valve controller 34 detects that Cy3< C3< Cy4 and C1 is 1, the small displacement oil pump motor controller 41 controls the small oil pump motor 5 to operate, and the motor speed increases as the voltage signal of C3 increases; meanwhile, the valve controller 34 controls the electromagnet m2 to be electrified, so that oil supply of the small-displacement oil pump is realized, and the gantry is tilted backwards.
The working principle is as follows:
The lifting potentiometer 22 outputs a voltage signal C9 (the variation range is 0-5V), when the thumb switch is in the neutral position, the potentiometer outputs a voltage signal C9 equal to 2.5V, when the thumb switch is pushed forwards, the potentiometer outputs a voltage signal variation range of 2.5-0V, and when the thumb switch is pulled backwards, the potentiometer outputs a voltage signal variation range of 2.5-5V. The lift switch signal C8 is a switching signal having a value of 0 or 1, and indicates that the lift switch is closed and a fork lift request is issued to the controller when C1 is equal to 1, and indicates that the lift switch is open when C8 is equal to 0. The down switch signal C7 is a switch signal having a value of 0 or 1, and indicates that the down switch is closed when C7 is equal to 1, and that the down switch is open when C7 is equal to 0.
The forward-backward potentiometer 26 outputs a voltage signal C6 (the range of variation is 0-5V), when the thumb switch is in the neutral position, the potentiometer outputs a voltage signal C9 of 2.5V, when the thumb switch is pushed forward, the potentiometer outputs a voltage signal of 2.5-0V, and when the thumb switch is pulled backward, the potentiometer outputs a voltage signal of 2.5-5V. The advance switch signal C5 is a switch signal having a value of 0 or 1, and indicates that the advance switch is closed and a gantry advance request is issued to the controller when C5 is equal to 1, and indicates that the advance switch is open when C5 is equal to 0. The backward switch signal C4 is a switch signal, which takes a value of 0 or 1, and indicates that the backward switch is closed when C4 is equal to 1, and issues a request for backward movement of the door to the controller, and indicates that the backward switch is open when C4 is equal to 0.
The inclined potentiometer 30 outputs a voltage signal C3 (the variation range is 0-5V), when the thumb switch is in the neutral position, the potentiometer output voltage signal C9 is 2.5V, when the thumb switch is pushed forwards, the potentiometer output voltage signal variation range is 2.5-0V, and when the thumb switch is pulled backwards, the potentiometer output voltage signal variation range is 2.5-5V. The forward tilt switch signal C2 is a switch signal having a value of 0 or 1, and indicates that the forward tilt switch is closed and a mast forward tilt request is issued to the controller when C2 is equal to 1, and indicates that the forward tilt switch is open when C2 is equal to 0. The lean back switch signal C1 is a switch signal having a value of 0 or 1, and indicates that the lean back switch is closed when C1 is equal to 1, and issues a mast lean back request to the controller, and indicates that the lean back switch is open when C1 is equal to 0.
s1 outputted from the controller is a current value, and controls electromagnet m1, and when S1 is 2A (amperes), it indicates that electromagnet m1 is energized, and when S1 is 0A, it indicates that electromagnet m1 is not energized; s2 output by the controller is a current value, and controls the electromagnet m2, when S2 is 2A, the electromagnet m2 is powered, and when S2 is 0A, the electromagnet m2 is not powered; s3 output by the controller is a current value, and controls the electromagnet m3, when S3 is 2A, the electromagnet m3 is powered, and when S3 is 0A, the electromagnet m3 is not powered; s4 output by the controller is a current value, and controls the electromagnet m4, when S4 is 2A, the electromagnet m4 is powered, and when S4 is 0A, the electromagnet m4 is not powered; s6 output by the controller is a current value, and controls the electromagnet m6, when S6 is 2A, the electromagnet m6 is powered, and when S6 is 0A, the electromagnet m6 is not powered; s5 output by the controller is a current value, the proportional electromagnet m5 is controlled, when S5 is 0.1-2A, the electromagnet m5 is powered, and when S5 is 0A, the electromagnet m5 is not powered.
The large displacement oil pump 3 has a displacement of: 15ml/r, and supplies oil to the left lifting oil cylinder 15 and the right lifting oil cylinder 16 to meet the lifting requirement of the pallet fork. The displacement of the small displacement oil pump 6 is: 2ml/r, and oil is supplied to the inclined oil cylinder 11 and the forward and backward moving oil cylinder 13, so that the requirements of the inclination and forward and backward movement of the gantry are met; and oil is supplied to the left lifting oil cylinder 15 and the right lifting oil cylinder 16, so that the requirement of the lifting micromotion performance of the pallet fork is met.
The large displacement oil pump motor controller 33, the small displacement motor controller 31 and the valve controller 34 are communicated with each other through a CAN bus.
Fork lifting (normal): when the valve controller detects that the output signal C8 of the lifting switch is equal to 1, the output signal C9 of the lifting potentiometer has a voltage signal change range: and 2.35-0V, indicating that the driver sends a normal lifting request. The large-displacement oil pump motor controller controls the large-displacement oil pump motor to work, the motor speed is 0-2900 rpm (the motor speed is increased along with the reduction of a C9 voltage signal), the valve controller outputs S6 to be 2A, the electromagnet m6 is electrified, and the two-position two-way lifting electromagnetic valve 19 works on the left position. The large-displacement oil pump 2 drives the large-displacement oil pump 3, the output hydraulic oil passes through the large-displacement oil pump one-way valve 4 from a port P1, passes through a port A5 of the two-position two-way lifting electromagnetic valve 19 to a port B5, passes through the lifting electromagnetic valve single valve 18 and passes through a port F3 to the left lifting oil cylinder 15 to supply oil to the left lifting oil cylinder, and passes through a port E3 to the right lifting oil cylinder 16 to supply oil to the right lifting oil cylinder to realize fork lifting.
the valve controller detects that a lifting switch output signal C8 is equal to 1, and a lifting potentiometer output signal C9 has a voltage signal change range: and 2.49-2.35V indicates that the driver sends a micro-motion lifting request. The small-displacement oil pump motor controller controls the small-displacement oil pump motor to work, the motor speed is 700rpm, the valve controller outputs S6 which is 2A, the electromagnet m6 is electrified, and the two-position two-way lifting electromagnetic valve 19 works on the left position. The small-displacement oil pump motor drive 5 drives the small-displacement oil pump 6, the output hydraulic oil passes through the small-displacement oil pump one-way valve 7 from the port P2, passes through the port A5 of the two-position two-way lifting electromagnetic valve 19 to the port B5, passes through the lifting electromagnetic valve single valve 18, passes through the port F3 to the left lifting oil cylinder 15, supplies oil to the left lifting oil cylinder, passes through the port E3 to the right lifting oil cylinder 16, supplies oil to the right lifting oil cylinder, and realizes fork lifting. Because the discharge capacity of the small-discharge oil pump is small, small flow can be output under the condition that the rotation speed of the small-discharge oil pump motor and the small-discharge oil pump is high, and the micro-motion lifting of the pallet fork is realized; the oil pump and the motor have higher rotating speed, so the working stability is good, and the micro-motion lifting performance of the pallet fork is good.
Descending of the pallet fork: when the valve controller detects that the output signal C7 of the falling switch is equal to 1, the voltage signal variation range of the output signal C9 of the lifting potentiometer is as follows: and 2.49-5V, indicating that the driver sends a fork descending request. The valve controller output S5 is 0.1 to 2A (the current value increases with the increase of the C9 voltage signal, the larger the current value, the larger the opening of the two-position two-way electromagnetic lowering valve, and the larger the lowering speed), the electromagnet m6 is energized, and the two-position two-way lowering electromagnetic valve 19 operates at the upper position. The hydraulic oil of the left lifting oil cylinder 15 passes through an F3 port, the hydraulic oil of the right lifting oil cylinder 16 passes through an E3 port, passes through an A3 port to a B3 port of the two-position two-way descending electromagnetic valve 8, and returns to the hydraulic oil tank 1, so that the fork is descended.
Fork descent (manual unloading): when the power of the whole vehicle is off and the fork needs to descend from the high position, a driver opens the manual unloading valve 17. The hydraulic oil of the left lifting cylinder 15 passes through an F3 port, the hydraulic oil of the right lifting cylinder 16 passes through an E3 port, passes through an A4 port to a B4 port of the manual unloading valve 17, and returns to the hydraulic oil tank 1, so that manual unloading is realized.
Advancing a gantry: when the valve controller detects that the output signal C5 of the forward shift switch is equal to 1, the voltage signal variation range of the output signal C6 of the forward and backward shift potentiometer is as follows: and 2.49-0V, indicating that the driver sends a portal advance request. The valve controller output S4 is 2A, the electromagnet m4 is energized, and the three-position four-way forward solenoid valve 9 operates in the left position. The small-displacement oil pump motor controller controls the small-displacement oil pump motor to work, and the rotating speed of the motor is 500-2900 rpm (increased along with the decrease of the C6 voltage signal). The small displacement oil pump motor drive 5 drives the small displacement oil pump 6, the output hydraulic oil passes from the P2 port to the C2 port through the A2 port of the three-position four-way forward moving electromagnetic valve 9, passes through the two-way hydraulic lock 14, passes through the E2 port to the rodless cavity of the forward and backward moving oil cylinder 13, pushes the piston to run, the hydraulic oil with the rod cavity of the forward and backward moving oil cylinder 13 passes through the F2 port, the two-way hydraulic lock 14, the D2 port of the three-position four-way forward moving electromagnetic valve 9 to the B2 port, and returns to the hydraulic oil tank, so as to realize the forward. Because the discharge capacity of the small-discharge oil pump is small, the small-discharge oil pump can output small flow under the conditions that the rotation speed of the small-discharge oil pump motor and the small-discharge oil pump is high, the gantry is moved forwards, the oil pump and the motor are guaranteed to work efficiently, and energy is saved.
moving the gantry backwards: when the valve controller detects that the backward shift switch output signal C4 is equal to 1, the voltage signal variation range of the backward shift potentiometer output signal C6 is as follows: and 2.51-5V, indicating that the driver sends a backward moving request of the portal. The valve controller output S3 is 2A, the electromagnet m3 is energized, and the three-position four-way forward solenoid valve 9 operates in the right position. The small-displacement oil pump motor controller controls the small-displacement oil pump motor to work, and the rotating speed of the motor is 500-2900 rpm (increased along with the increase of a C6 voltage signal). The small displacement oil pump motor drive 5 drives the small displacement oil pump 6, the output hydraulic oil passes from the port P2 to the port D2 through the port A2 of the three-position four-way forward moving electromagnetic valve 9, passes through the bidirectional hydraulic lock 14, passes through the port F2 to the rod cavity of the forward and backward moving oil cylinder 13, pushes the piston to run, the hydraulic oil in the rodless cavity of the forward and backward moving oil cylinder 13 passes through the port E2, the bidirectional hydraulic lock 14, the port C2 of the three-position four-way forward moving electromagnetic valve 9 to the port B2, and returns to the hydraulic oil tank 1, so that the backward movement of the gantry is realized. Because the discharge capacity of the small-discharge oil pump is small, the small-discharge oil pump can output small flow under the condition that the rotation speed of the small-discharge oil pump motor and the small-discharge oil pump is high, the backward movement of the portal frame is realized, meanwhile, the high-efficiency work of the oil pump and the motor is ensured, and the energy is saved.
the gantry is inclined forwards: the valve controller detects that the forward tilting switch output signal C2 is equal to 1, and the voltage signal variation range of the tilting potentiometer output signal C3 is as follows: and 2.49-0V, indicating that the driver sends a forward tilting request of the portal. The valve controller output S1 is 2A, the solenoid m1 is energized, and the three-position, four-way solenoid tilt valve 10 operates in the right position. The small-displacement oil pump motor controller controls the small-displacement oil pump motor to work, and the rotating speed of the motor is 500-2900 rpm (increased along with the decrease of the C6 voltage signal). The small-displacement oil pump motor drive 5 drives the small-displacement oil pump 6, the output hydraulic oil passes from a port P2 to a port D1 through an A1 port of the three-position four-way inclined electromagnetic valve 10 and then to a rod cavity of the inclined oil cylinder 11 through a port F1 to push a piston to run, and the hydraulic oil in a rodless cavity of the inclined oil cylinder 11 passes through a port E1, the balance valve 12 and a port C1 of the three-position four-way inclined electromagnetic valve 10 to a port B1 and returns to the hydraulic oil tank 1 to realize the forward tilting action of the gantry. Because the discharge capacity of the small-discharge oil pump is small, the small-discharge oil pump can output small flow under the conditions that the rotation speed of the small-discharge oil pump motor and the small-discharge oil pump is high, the forward tilting of the gantry is realized, meanwhile, the high-efficiency work of the oil pump and the motor is ensured, and the energy is saved.
The gantry is tilted backwards: the valve controller detects that the backward switch output signal C1 is 1, and the voltage signal variation range of the tilt potentiometer output signal C3 is: and 2.51-5V, indicating that the driver sends a mast backward request. The valve controller output S2 is 2A, the electromagnet m2 is energized, and the three-position four-way solenoid tilt valve 10 operates in the left position. The small-displacement oil pump motor controller controls the small-displacement oil pump motor to work, and the rotating speed of the motor is 500-2900 rpm (increased along with the increase of a C6 voltage signal). The small displacement oil pump motor drive 5 drives the small displacement oil pump 6, the output hydraulic oil passes from a P2 port to a C1 port through an A1 port of the three-position four-way inclined electromagnetic valve 10, the balance valve 12 passes through an E1 port to a rodless cavity of the inclined oil cylinder 11 to push a piston to operate, the hydraulic oil of a rod cavity of the inclined oil cylinder 11 passes through an F1 port and a D1 port of the three-position four-way inclined electromagnetic valve 10 to a B1 port, and returns to the hydraulic oil tank 1 to realize the backward tilting action of the gantry. Because the discharge capacity of the small-discharge oil pump is small, the small-discharge oil pump can output small flow under the conditions that the rotation speed of the small-discharge oil pump motor and the small-discharge oil pump is high, the backward tilting of the portal frame is realized, the high-efficiency work of the oil pump and the motor is ensured, and the energy is saved.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (8)
1. The utility model provides a forward type fork truck hydraulic system, based on hydraulic tank (1) of forward type fork truck, set up the oil pump in hydraulic tank (1), the oil pump passes through pipeline and hydro-cylinder intercommunication, the hydro-cylinder includes slope hydro-cylinder (11), front and back hydro-cylinder (13), left lift cylinder (15), right lift cylinder (16), its characterized in that:
The oil pump comprises a large-displacement oil pump (3) and a small-displacement oil pump (6), an oil outlet pipeline of the large-displacement oil pump (3) is respectively communicated with a left lifting oil cylinder (15) and a right lifting oil cylinder (16), and the small-displacement oil pump (6) is respectively communicated with an inclined oil cylinder (11), a forward-backward moving oil cylinder (13), a left lifting oil cylinder (15) and a right lifting oil cylinder (16);
The large-displacement oil pump (3) is connected with the large-displacement oil pump motor (2), and the small-displacement oil pump (6) is connected with the small-displacement oil pump motor (5);
The large-displacement oil pump motor controller (33) controls a large-displacement oil pump motor (2) to work, and the small-displacement oil pump motor controller (41) controls a small-displacement oil pump motor (5) to work;
the large-displacement oil pump motor controller (33) and the small-displacement oil pump motor controller (41) are in communication connection with the valve controller (34) through a CAN bus respectively;
The valve controller (34) is respectively in communication connection with a lifting thumb switch (21), a forward and backward movement thumb switch (25) and an inclined thumb switch (29) of the forward type forklift.
2. a reach truck hydraulic system as set forth in claim 1, characterized in that: the oil pump further comprises a two-position two-way lifting electromagnetic valve (19), wherein the two-position two-way lifting electromagnetic valve (19) is respectively connected with the large-displacement oil pump (3) and the small-displacement oil pump (6) through hydraulic oil pipes;
the two-position two-way lifting electromagnetic valve (19) is also respectively connected with the left lifting oil cylinder (15) and the right lifting oil cylinder (16) through hydraulic oil pipes;
The two-position two-way lifting electromagnetic valve (19) is provided with a switching electromagnetic valve which comprises an electromagnet m6 and is connected with a valve controller (34).
3. A reach truck hydraulic system as set forth in claim 1, characterized in that: the lifting device is characterized by further comprising a two-position two-way descending electromagnetic valve (8), wherein the two-position two-way descending electromagnetic valve (8) is respectively connected with the left lifting oil cylinder (15) and the right lifting oil cylinder (16) through hydraulic oil pipes;
the two-position two-way descending electromagnetic valve (8) is connected with the hydraulic oil tank (1) through a hydraulic oil pipe;
The two-position two-way descending electromagnetic valve (8) is provided with a proportional electromagnetic valve which comprises an electromagnet m5 and is connected with a valve controller (34).
4. a reach truck hydraulic system as set forth in claim 1, characterized in that: the three-position four-way forward electromagnetic valve (9) is respectively connected with the large-displacement oil pump (3) and the small-displacement oil pump (6) through hydraulic oil pipes;
The three-position four-way forward electromagnetic valve (9) is also connected with the hydraulic oil tank (1) through a hydraulic oil pipe;
the three-position four-way forward solenoid valve (9) is also connected with a forward and backward moving oil cylinder (13) through a hydraulic oil pipe;
the three-position four-way forward moving electromagnetic valve (9) is provided with a switching electromagnetic valve comprising an electromagnet m3 and an electromagnetic valve m4, and the electromagnet m3 and the electromagnetic valve m4 are respectively connected with a valve controller (34).
5. a reach truck hydraulic system as set forth in claim 1, characterized in that: the three-position four-way inclined electromagnetic valve (10) is connected with the large-displacement oil pump (3) and the small-displacement oil pump (6) through hydraulic oil pipes respectively;
The three-position four-way inclined solenoid valve (10) is connected with the hydraulic oil tank (1) through a hydraulic oil pipe;
The three-position four-way inclined solenoid valve (10) is connected with an inclined oil cylinder (11) through a hydraulic oil pipe;
the three-position four-way tilting solenoid valve (10) is provided with a switching solenoid valve comprising an electromagnet m1 and an electromagnet m2, and the electromagnet m1 and the electromagnet m2 are respectively connected with a valve controller (34).
6. A reach truck hydraulic system as set forth in claim 1, characterized in that: the lifting thumb switch (21) comprises a lifting potentiometer (22), a lifting switch (23) and a descending switch (24), and the lifting potentiometer (22), the lifting switch (23) and the descending switch (24) are respectively connected with a valve controller (34).
7. A reach truck hydraulic system as set forth in claim 6, wherein: the forward and backward movement thumb switch (25) comprises a forward and backward movement potentiometer (26), a forward movement switch (27) and a backward movement switch (28);
the forward-backward potentiometer (26), the forward switch (27) and the backward switch (28) are respectively connected with a valve controller (34).
8. a reach truck hydraulic system as set forth in claim 7, characterized in that: the inclined thumb switch (29) comprises an inclined potentiometer (30), a forward tilting switch (31) and a backward tilting switch (32);
the inclined potentiometer (30), the forward tilting switch (31) and the backward tilting switch (32) are respectively connected with a valve controller (34).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920587839.8U CN209778220U (en) | 2019-04-26 | 2019-04-26 | forward-moving forklift hydraulic system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920587839.8U CN209778220U (en) | 2019-04-26 | 2019-04-26 | forward-moving forklift hydraulic system |
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| Publication Number | Publication Date |
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| CN209778220U true CN209778220U (en) | 2019-12-13 |
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| CN201920587839.8U Active CN209778220U (en) | 2019-04-26 | 2019-04-26 | forward-moving forklift hydraulic system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109911820A (en) * | 2019-04-26 | 2019-06-21 | 安徽合力股份有限公司 | Reach truck Hydraulic system and control method |
| CN112209305A (en) * | 2020-10-30 | 2021-01-12 | 合力工业车辆（上海）有限公司 | Hydraulic system of storage forklift |
-
2019
- 2019-04-26 CN CN201920587839.8U patent/CN209778220U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109911820A (en) * | 2019-04-26 | 2019-06-21 | 安徽合力股份有限公司 | Reach truck Hydraulic system and control method |
| CN109911820B (en) * | 2019-04-26 | 2023-09-22 | 安徽合力股份有限公司 | Forward forklift hydraulic system and control method |
| CN112209305A (en) * | 2020-10-30 | 2021-01-12 | 合力工业车辆（上海）有限公司 | Hydraulic system of storage forklift |
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