CN114132243A - Dumper lifting system and method thereof - Google Patents
Dumper lifting system and method thereof Download PDFInfo
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- CN114132243A CN114132243A CN202111567593.6A CN202111567593A CN114132243A CN 114132243 A CN114132243 A CN 114132243A CN 202111567593 A CN202111567593 A CN 202111567593A CN 114132243 A CN114132243 A CN 114132243A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60P—VEHICLES ADAPTED FOR LOAD TRANSPORTATION OR TO TRANSPORT, TO CARRY, OR TO COMPRISE SPECIAL LOADS OR OBJECTS
- B60P1/00—Vehicles predominantly for transporting loads and modified to facilitate loading, consolidating the load, or unloading
- B60P1/04—Vehicles predominantly for transporting loads and modified to facilitate loading, consolidating the load, or unloading with a tipping movement of load-transporting element
- B60P1/16—Vehicles predominantly for transporting loads and modified to facilitate loading, consolidating the load, or unloading with a tipping movement of load-transporting element actuated by fluid-operated mechanisms
- B60P1/162—Vehicles predominantly for transporting loads and modified to facilitate loading, consolidating the load, or unloading with a tipping movement of load-transporting element actuated by fluid-operated mechanisms the hydraulic system itself
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Abstract
A lifting system of a dumper comprises an oil tank assembly, a hydraulic pump, a lifting valve, a hydraulic oil cylinder, a power takeoff electromagnetic valve, a power takeoff, a lifting electromagnetic valve, a descending electromagnetic valve and a control system, wherein the oil tank assembly, the hydraulic pump, the lifting valve and the hydraulic oil cylinder are sequentially connected through oil pipes; the power takeoff electromagnetic valve and the power takeoff are connected with an air source through a first air pipe, and the power takeoff is connected with the hydraulic pump; the lifting electromagnetic valve and the lifting valve are connected with an air source through a second air pipe; the descending electromagnetic valve and the lifting valve are connected with an air source through a third air pipe; the control system is respectively electrically connected with the power takeoff electromagnetic valve, the lifting electromagnetic valve and the descending electromagnetic valve. The lifting system of the dumper can realize unmanned lifting and descending operation of the dumper and has the advantages of simple structure, intelligence, stability and reliability. The invention also relates to a lifting method of the dump truck.
Description
Technical Field
The invention relates to the technical field of dumper, in particular to a dumper lifting system and a dumper lifting method.
Background
Digitalization, remote control and unmanned control are high places for the competition of the future industries. Along with the development of artificial intelligence, intelligent products are more and more, and unmanned technology is a research hotspot in recent years. The unmanned technology on the passenger car makes breakthrough in certain technical aspects. Unmanned driving has great advantage in security and economic nature, but through intelligent control and management greatly reduced personnel misoperation cause equipment and personnel's loss.
Compared with a passenger vehicle, the unmanned dumper has the advantages that the functions and the principles of steering and braking are consistent, and the unmanned dumper can be used for reference, but the dumper is provided with one more lifting system compared with the passenger vehicle. How to provide a set of unmanned lifting system becomes the research and development focus of various large dump truck manufacturers.
Disclosure of Invention
In view of this, the invention provides a lifting system for a dump truck, which can realize unmanned lifting and descending operations of the dump truck and has the advantages of simple structure, intelligence, stability and reliability.
A lifting system of a dumper comprises an oil tank assembly, a hydraulic pump, a lifting valve, a hydraulic oil cylinder, a power takeoff electromagnetic valve, a power takeoff, a lifting electromagnetic valve, a descending electromagnetic valve and a control system, wherein the oil tank assembly, the hydraulic pump, the lifting valve and the hydraulic oil cylinder are sequentially connected through oil pipes; the power takeoff electromagnetic valve and the power takeoff are connected with an air source through a first air pipe, and the power takeoff is connected with the hydraulic pump; the lifting electromagnetic valve and the lifting valve are connected with an air source through a second air pipe; the descending electromagnetic valve and the lifting valve are connected with an air source through a third air pipe; the control system is respectively electrically connected with the power takeoff electromagnetic valve, the lifting electromagnetic valve and the descending electromagnetic valve; when lifting operation is carried out, the control system controls the power takeoff electromagnetic valve and the lifting electromagnetic valve to be electrified, and the hydraulic pump pumps hydraulic oil of the oil tank assembly to the hydraulic oil cylinder; when the hydraulic oil cylinder is in descending operation, the control system controls the descending electromagnetic valve to be electrified, and hydraulic oil in the hydraulic oil cylinder flows back to the oil tank assembly through the oil pipe.
In an embodiment of the invention, the dumper lifting system further includes a limit valve, the limit valve is connected to the second air pipe between the lifting electromagnetic valve and the lifting valve, when the hydraulic oil cylinder is lifted to a set height, the limit valve blocks the second air pipe, a valve core of the lifting valve moves to a middle position, and the hydraulic oil cylinder stops lifting.
In an embodiment of the invention, the lifting system of the dump truck further includes a lifting limit switch, the lifting limit switch is electrically connected with the control system, the lifting limit switch is used for detecting a lifting position of the hydraulic oil cylinder, when the hydraulic oil cylinder is lifted to a set height, the lifting limit switch sends a first signal to the control system, and the control system controls the lifting electromagnetic valve and the power takeoff electromagnetic valve to be powered off according to the first signal.
In an embodiment of the invention, the dumper lifting system further includes a descending limit switch, the descending limit switch is electrically connected with the control system, the descending limit switch is used for detecting a descending position of the hydraulic oil cylinder, when the hydraulic oil cylinder descends to trigger the descending limit switch, the descending limit switch sends a second signal to the control system, and the control system controls the descending electromagnetic valve to lose power according to the second signal.
In an embodiment of the present invention, the lifting system of the dump truck further includes a lifting shuttle valve and a lowering shuttle valve, the lifting shuttle valve is connected to the lifting solenoid valve and the second air pipe of the lifting valve, and the lowering shuttle valve is connected to the lowering solenoid valve and the third air pipe of the lifting valve.
In an embodiment of the invention, the lifting system of the dump truck further comprises a power takeoff switch and a lifting handle, wherein the power takeoff switch is electrically connected with the power takeoff electromagnetic valve and is used for controlling the power on and power off of the power takeoff electromagnetic valve; the lifting handle is connected with the lifting shuttle valve through the second air pipe and connected with the descending shuttle valve through the third air pipe, and when the lifting handle is used for controlling the air source to be communicated with the lifting shuttle valve and the lifting valve and controlling the air source to be communicated with the descending shuttle valve and the lifting valve.
The invention also relates to a dumper lifting method, which is used for the dumper lifting system and comprises the following steps:
when the lifting operation is carried out, the control system is utilized to control the power takeoff electromagnetic valve and the lifting electromagnetic valve to be electrified, and the power takeoff electromagnetic valve is electrified to start the hydraulic pump; the lifting electromagnetic valve is electrified, so that gas output by the gas source passes through the lifting electromagnetic valve to reach the lifting valve, a valve core of the lifting valve is moved to a lifting position, and the hydraulic pump pumps hydraulic oil of the oil tank assembly to the hydraulic oil cylinder;
when the hydraulic oil cylinder is in descending operation, the control system is utilized to control the descending electromagnetic valve to be electrified, the descending electromagnetic valve is electrified to enable gas output by the gas source to pass through the descending electromagnetic valve to the lifting valve, the valve core of the lifting valve is enabled to move to a descending position, and hydraulic oil in the hydraulic oil cylinder flows back to the oil tank assembly through the oil pipe.
In the embodiment of the invention, when the hydraulic oil cylinder is lifted to a set height, the second air pipe is blocked by using the limit valve, at the moment, the valve core of the lifting valve moves from the lifting displacement to the middle position, and the hydraulic oil cylinder stops lifting.
In the embodiment of the invention, a lifting limit switch is used for detecting the lifting position of the hydraulic oil cylinder, when the hydraulic oil cylinder is lifted to a set height, the lifting limit switch sends a first signal to a control system, and the control system controls the lifting electromagnetic valve to be powered off according to the first signal;
and detecting the descending position of the hydraulic oil cylinder by using a descending limit switch, sending a second signal to the control system by using the descending limit switch when the hydraulic oil cylinder descends to trigger the descending limit switch, and controlling the descending electromagnetic valve to lose power by using the control system according to the second signal.
In the embodiment of the invention, a lifting shuttle valve is connected to the second air pipes of the lifting solenoid valve and the lifting valve, and a descending shuttle valve is connected to the third air pipes of the descending solenoid valve and the lifting valve;
when the lifting operation is manually controlled, a power takeoff switch is toggled to enable a power takeoff electromagnetic valve to be electrified, and the power takeoff electromagnetic valve is electrified to enable a hydraulic pump to be started; shifting a lifting handle to a lifting position, enabling gas output by the gas source to pass through the lifting shuttle valve to reach the lifting valve, enabling a valve core of the lifting valve to move to the lifting position, and enabling the hydraulic pump to pump hydraulic oil of the oil tank assembly to the hydraulic oil cylinder;
when the descending operation is manually controlled, the power takeoff switch is reset, so that the power takeoff electromagnetic valve is de-energized, and the hydraulic pump stops working; and shifting the lifting handle to a descending position, enabling gas output by the gas source to pass through the descending shuttle valve to the lifting valve, enabling a valve core of the lifting valve to move to the descending position, and enabling hydraulic oil in the hydraulic oil cylinder to flow back to the oil tank assembly through the oil pipe.
The lifting system of the dumper can realize unmanned lifting and descending operation of the dumper by controlling the lifting electromagnetic valve and the descending electromagnetic valve through the control system, and has the advantages of simple structure, intelligence, stability, reliability and the like. In the unmanned lifting process, if sudden system faults occur, the lifting electromagnetic valve and the descending electromagnetic valve are controlled to be powered off simultaneously, the lifting valve can automatically return to a middle position, the hydraulic oil cylinder is in a holding position, and the safety of vehicles and personnel can be protected to the maximum extent.
Drawings
FIG. 1 is a schematic structural diagram of a dump truck lift system of the present application;
FIG. 2 is a schematic view of a dump truck lift system of the present application performing an unmanned lift operation;
FIG. 3 is a schematic view of the dump truck lifting system of the present application lifted into place;
FIG. 4 is a schematic illustration of a dump truck lift system of the present application performing an unmanned lowering operation;
FIG. 5 is a schematic view of a dump truck lift system of the present application performing manned lift operations;
FIG. 6 is a schematic diagram of a dump truck lifting system of the present application performing manned lifting into position;
fig. 7 is a schematic diagram of a manned descent operation performed by the dump truck lift system of the present application.
Detailed Description
The application provides a tipper system of lifting.
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In order to facilitate understanding of those skilled in the art, the present application provides a specific implementation process of the technical solution provided by the present application through the following embodiments.
Fig. 1 is a schematic structural diagram of a dump truck lifting system of the present application, and as shown in fig. 1, the dump truck lifting system includes a tank assembly 11, a hydraulic pump 12, a lifting valve 13, a hydraulic cylinder 14, a power takeoff solenoid valve 15, a power takeoff 16, a lifting solenoid valve 16, a descending solenoid valve 18, and a control system 19, wherein:
the oil tank assembly 11, the hydraulic pump 12, the lifting valve 13 and the hydraulic oil cylinder 14 are sequentially connected through an oil pipe 101; the power takeoff electromagnetic valve 15 and the power takeoff 16 are connected with an air source through a first air pipe 201, and the power takeoff 16 is connected with the hydraulic pump 12; the lifting electromagnetic valve 16 and the lifting valve 13 are connected with an air source through a second air pipe 202; the descending electromagnetic valve 18 and the lifting valve 13 are connected with an air source through a third air pipe 203; the control system 19 is respectively electrically connected with the power takeoff electromagnetic valve 15, the lifting electromagnetic valve 16 and the descending electromagnetic valve 18;
when lifting operation is carried out, the control system 19 controls the power takeoff electromagnetic valve 15 and the lifting electromagnetic valve 16 to be electrified, and the hydraulic pump 12 pumps hydraulic oil of the oil tank assembly 11 to the hydraulic oil cylinder 14;
when the descending operation is performed, the control system 19 controls the descending electromagnetic valve 18 to be electrified, and hydraulic oil in the hydraulic oil cylinder 14 flows back to the oil tank assembly 11 through the oil pipe 101;
when the lifting system of the dump truck fails in the unmanned lifting process, the lifting solenoid valve 16 and the descending solenoid valve 18 are controlled to be powered off simultaneously, at the moment, the lifting valve 13 can automatically return to the middle position, and the hydraulic oil cylinder 14 is in the holding position. In the present embodiment, hydraulic ram 14 is preferably a telescoping ram; the hydraulic pump 12 is preferably a gear pump; the control system 19 is a main vehicle control system 19 of the dump truck; the power takeoff electromagnetic valve 15 is electrified, gas output by a gas source passes through the power takeoff electromagnetic valve 15 to the power takeoff 16, so that the power takeoff 16 is meshed with the transmission, the power takeoff electromagnetic valve 15 is electrified, the power takeoff electromagnetic valve 15 blocks the first gas pipe 201, and the power takeoff 16 is separated from the transmission; when the lifting operation is not needed, the hydraulic pump 12 is not operated, and energy consumption is saved.
The lifting system of the dumper can realize unmanned lifting and descending operation of the dumper by controlling the lifting electromagnetic valve 16 and the descending electromagnetic valve 18 through the control system 19, and has the advantages of simple structure, intelligence, stability, reliability and the like. In the unmanned lifting process, the lifting system of the dump truck breaks down, the lifting electromagnetic valve 16 and the descending electromagnetic valve 18 are controlled to lose power at the same time, the lifting valve can automatically return to the middle position, the hydraulic oil cylinder is in the holding position, and the safety of vehicles and personnel can be protected to the maximum extent.
Optionally, fig. 2 is a schematic diagram of the dump truck lifting system of the present application for performing the unmanned lifting operation, as shown in fig. 2, the control system 19 sends a signal to energize the power takeoff solenoid valve 15 and the lifting solenoid valve 16, the power takeoff solenoid valve 15 is energized to engage the power takeoff 16 with the transmission and start to rotate, and the power takeoff 16 drives the hydraulic pump 12 to start; the lifting electromagnetic valve 16 is powered to enable gas output by the gas source to pass through the lifting electromagnetic valve 16 to the lifting valve 13, and the valve core of the lifting valve 13 is moved to a lifting position, at the moment, the oil pipe 101 between the hydraulic oil cylinder 14 and the oil tank assembly 11 is conducted, and the hydraulic oil pump 12 pumps hydraulic oil of the oil tank assembly 11 to the hydraulic oil cylinder 14.
Optionally, the lifting valve 13 includes a lifting reversing valve, which is preferably a pneumatic three-position three-way valve, and the lifting reversing valve has three oil ports, i.e., a first oil port a1, a second oil port a2, and a third oil port A3, the first oil port a1 of the lifting reversing valve is connected to the hydraulic pump 12, the second oil port a2 thereof is connected to the oil tank assembly 11, and the third oil port A3 thereof is connected to the hydraulic oil cylinder 14 through the oil pipe 101; the second air pipe 202 is communicated with one spring control cavity of the lifting reversing valve, the third air pipe 203 is communicated with the other spring control cavity of the lifting reversing valve, the air source injects air into the second air pipe 202 and the third air pipe 203 to control the lifting reversing valve to reverse, for example, when the air source injects air into the spring control cavity of the lifting reversing valve through the second air pipe 202, the valve core in the spring control cavity moves to the lifting position, at the moment, the first oil port A1 of the lifting reversing valve is communicated with the third oil port A3, so that the hydraulic pump 12 can convey hydraulic oil to the hydraulic cylinder 14 to drive the hydraulic cylinder 14 to lift.
Optionally, fig. 3 is a schematic diagram of the dump truck lifting system of the present application lifted in place, as shown in fig. 2 and fig. 3, the dump truck lifting system further includes a limit valve 20, the limit valve 20 is connected to the second air pipe 202 between the lifting solenoid valve 16 and the lifting valve 13, when the hydraulic cylinder 14 is lifted to a set height, the limit valve 20 blocks the second air pipe 202, the spool of the lifting valve 13 moves to a middle position, and the hydraulic cylinder 14 stops lifting. Specifically, when the hydraulic oil cylinder 14 is lifted to a set height, the limit valve 20 contacts the limit mechanism, at this time, the limit valve 20 cuts off the second air pipe 202, air in a spring control cavity of the lifting reversing valve corresponding to the second air pipe 202 flows out through the limit valve 20, the valve core returns to a middle position under the action of a spring, at this time, the hydraulic pump 12 is in a pressure relief state, and the hydraulic oil cylinder 14 stops lifting.
Optionally, as shown in fig. 3, the lifting system of the dump truck further includes a lifting limit switch 21, the lifting limit switch 21 is electrically connected to the control system 19, the lifting limit switch 21 is configured to detect a lifting position of the hydraulic cylinder 14, when the hydraulic cylinder 14 is lifted to a set height, the lifting limit switch 21 sends a first signal to the control system 19, and the control system 19 controls the lifting solenoid valve 16 and the power takeoff solenoid valve 15 to be powered off according to the first signal. Specifically, when the hydraulic oil cylinder 14 is lifted to a set height, the lifting limit switch 21 and the limit valve 20 simultaneously contact the limit mechanism, the lifting limit switch 21 sends a first signal to the control system 19, at the moment, the control system 19 judges that the cargo box is lifted in place, the lifting electromagnetic valve 16 and the power takeoff electromagnetic valve 15 are controlled to be powered off according to the first signal, the lifting electromagnetic valve 16 is powered off to block the second air pipe 202, the power takeoff electromagnetic valve 15 is powered off to disconnect the power takeoff 16 from the gearbox, at the moment, the hydraulic pump 12 stops working
Optionally, fig. 4 is a schematic diagram of the dumper lifting system of the present application performing unmanned lowering operation, as shown in fig. 4, the dumper lifting system further includes a lowering limit switch 22, the lowering limit switch 22 is electrically connected to the control system 19, the lowering limit switch 22 is used for detecting a lowering position of the hydraulic oil cylinder 14, when the hydraulic oil cylinder 14 is lowered to trigger the lowering limit switch 22, the lowering limit switch 22 sends a second signal to the control system 19, and the control system 19 controls the lowering solenoid valve 18 to be powered off according to the second signal. Specifically, when the dump truck finishes unloading, the control system 19 controls the descending electromagnetic valve 18 to be powered on, gas output by the gas source enters the spring control cavity of the lifting valve 13 through the third gas pipe 203, the gas pushes the valve core to move to a descending position, at this time, the second oil port a2 is communicated with the third oil port A3, hydraulic oil in the hydraulic oil cylinder 14 flows back to the oil tank assembly 11 through the oil pipe 101, the cargo box starts to descend by virtue of self weight, when the hydraulic oil cylinder 14 descends to trigger the descending limit switch 22, the descending limit switch 22 sends a second signal to the control system 19, the control system 19 controls the descending electromagnetic valve 18 to be powered off according to the second signal, at this time, the third gas pipe 203 is blocked by the descending electromagnetic valve 18, and the valve core in the spring control cavity returns to a middle position under the action of a spring. In this embodiment, the lifting limit switch 21 and the descending limit switch 22 enable the lifting system of the dump truck to automatically determine whether the lifting and descending are in place, and provide a basis for the next operation.
Optionally, as shown in fig. 1, the lifting system of the dump truck further includes a lifting shuttle valve 23 and a lowering shuttle valve 24, the lifting shuttle valve 23 is connected to the second air pipe 202 of the lifting solenoid valve 16 and the lifting valve 13, and the lowering shuttle valve 24 is connected to the third air pipe 203 of the lowering solenoid valve 18 and the lifting valve 13. When lifting operation is carried out, gas output by a gas source sequentially passes through the lifting electromagnetic valve 16, the lifting shuttle valve 23 and the limiting valve 20 to the lifting valve 13, so that a valve core of the lifting valve 13 moves to a lifting position; when the descending operation is performed, the gas output by the gas source sequentially passes through the descending electromagnetic valve 18 and the descending shuttle valve 24 to the lifting valve 13, so that the valve core of the lifting valve 13 moves to the descending position.
Optionally, as shown in fig. 1, the dump truck lifting system further includes a power takeoff switch and a lifting handle 26, the power takeoff switch is electrically connected to the power takeoff solenoid valve 15, and the power takeoff switch is used for controlling power on and power off of the power takeoff solenoid valve 15; the lifting handle 26 is connected to the lifting shuttle valve 23 through a second air pipe 202 and to the lowering shuttle valve 24 through a third air pipe 203, when the lifting handle 26 is used to control the air supply to communicate the lifting shuttle valve 23 with the lifting valve 13 and to control the air supply to communicate the lowering shuttle valve 24 with the lifting valve 13. In this embodiment, the power takeoff switch is disposed on the center control panel, but not limited thereto; a pneumatic reversing valve, in particular a three-position four-way valve, is arranged in the lifting handle 26.
When the control system 19 has a fault or the current unloading area is not suitable for the self-dumping truck to be driven by no people, the manual driving mode can be switched to carry out lifting and descending operations, specifically:
fig. 5 is a schematic diagram of the dump truck lifting system of the present application for manned lifting operation, as shown in fig. 5, when the lifting operation is manually controlled, the power takeoff switch is pressed to energize the power takeoff solenoid valve 15, then the driver shifts the lifting position by the lifting handle 26, the gas output by the gas source passes through the lifting shuttle valve 23 to the lifting valve 13, and the spool of the lifting valve 13 is moved to the lifting position, and the hydraulic pump 12 pumps the hydraulic oil of the tank assembly 11 to the hydraulic cylinder 14.
Fig. 6 is a schematic diagram of the dump truck lifting system of the present application for lifting in place by someone driving, as shown in fig. 6, when the hydraulic cylinder 14 is lifted to a set height, the limit valve 20 contacts the limit mechanism, at this time, the limit valve 20 cuts off the second air pipe 202, the air in the spring control chamber of the lifting reversing valve corresponding to the second air pipe 202 flows out through the limit valve 20, the spool returns to the middle position under the action of the spring, at this time, the hydraulic pump 12 is in a pressure relief state, and the hydraulic cylinder 14 stops lifting.
Fig. 7 is a schematic diagram of the dump truck lifting system of the present application performing manned lowering operation, as shown in fig. 7, when the dump truck finishes unloading and performs manual control lowering operation, the power takeoff switch is reset to de-energize the power takeoff solenoid valve 15, and the hydraulic pump 12 stops working; the lifting handle 26 is shifted to a descending position, gas output by the gas source passes through the descending shuttle valve 24 to the lifting valve 13, the valve core of the lifting valve 13 is moved to the descending position, and hydraulic oil in the hydraulic oil cylinder 14 flows back to the oil tank assembly 11 through the oil pipe 101.
The lifting shuttle valve 23 and the descending shuttle valve 24 of the present invention can not only keep the artificial lifting and descending operation, but also realize the unmanned lifting and descending operation.
Optionally, the lifting shuttle valve 23 and the lowering shuttle valve 24 each include a first port, a second port, and a third port, the first port and the second port of the lifting shuttle valve 23 are respectively connected to the second air pipe 202 between the lifting solenoid valve 16 and the limit valve 20, and the third port of the lifting shuttle valve 23 is connected to the lifting handle 26; the first port and the second port of the descending shuttle valve 24 are respectively connected with a third air pipe 203 between the descending electromagnetic valve 18 and the lifting valve 13, and the third port of the lifting shuttle valve 23 is connected with the lifting handle 26.
Optionally, an oil inlet check valve is further installed at the first oil port a1 of the lift valve 13, so that the hydraulic oil flows from the hydraulic pump 12 to the lift valve 13 in one direction, and the hydraulic oil is prevented from flowing back. The second port a2 of the lift valve 13 is connected to the tank assembly 11 through a filter, and the filter is connected in parallel with a return check valve, so that the hydraulic oil passing through the second port a2 of the lift valve 13 flows back to the tank assembly 11 through the filter, and when the filter is clogged or the flow rate is too large, the hydraulic oil can flow back to the tank assembly 11 through the parallel return check valve.
Optionally, a branch oil pipe 101 branches from the oil pipe 101, the branch oil pipe 101 is connected to the second port a2 of the lift valve 13, and an overflow valve is installed on the branch oil pipe 101, so that during the descending process of the hydraulic cylinder 14, the pressure in the lifting oil path is prevented from being too high, and the stability of the system pressure is ensured.
Optionally, the branch oil pipe 101 is further provided with a throttle valve, when hydraulic oil flows through the throttle valve, a back pressure is formed in a throttle valve reservoir, and the hydraulic oil cylinder 14 is ensured to descend stably; and the spring control chamber of the lift valve 13 corresponding to the third air pipe 203 is connected to the oil pipe 101 between the relief valve and the throttle valve, and when the pressure in the oil pipe 101 is excessive, a part of the hydraulic oil flowing through the branch oil pipe 101 flows into the spring control chamber of the lift valve 13 corresponding to the third air pipe 203, and the opening degree of the valve port of the lift valve 13 is increased, so that the hydraulic oil can flow to the oil tank assembly 11 relatively quickly.
Referring to fig. 1 to 7, the present application further relates to a dumper lifting method, where the dumper lifting method is used in the dumper lifting system, and the dumper lifting method includes:
when the lifting operation is carried out, the control system 19 is used for controlling the power takeoff electromagnetic valve 15 and the lifting electromagnetic valve 16 to be electrified, and the power takeoff electromagnetic valve 15 is electrified to start the hydraulic pump 12; the lifting electromagnetic valve 16 is powered to enable gas output by the gas source to pass through the lifting electromagnetic valve 16 to the lifting valve 13, the valve core of the lifting valve 13 is moved to a lifting position, and the hydraulic pump 12 pumps hydraulic oil of the oil tank assembly 11 to the hydraulic oil cylinder 14;
when the descending operation is performed, the control system 19 is used for controlling the descending electromagnetic valve 18 to be powered on, the descending electromagnetic valve 18 is powered on, so that gas output by a gas source passes through the descending electromagnetic valve 18 to the lifting valve 13, the valve core of the lifting valve 13 moves to a descending position, and hydraulic oil in the hydraulic oil cylinder 14 flows back to the oil tank assembly 11 through the oil pipe 101;
when the lifting system of the dump truck fails in the unmanned lifting process, the lifting solenoid valve 16 and the descending solenoid valve 18 are controlled to be powered off simultaneously, at the moment, the lifting valve 13 can automatically return to the middle position, and the hydraulic oil cylinder 14 is in the holding position.
According to the lifting method of the dump truck, the lifting solenoid valve 16 and the descending solenoid valve 18 are controlled by the control system 19, so that unmanned lifting and descending operations of the dump truck can be realized. In the unmanned lifting process, the lifting system of the dump truck breaks down, the lifting electromagnetic valve 16 and the descending electromagnetic valve 18 are controlled to lose power at the same time, the lifting valve can automatically return to the middle position, the hydraulic oil cylinder 14 is in the holding position, and the safety of vehicles and personnel can be protected to the maximum extent.
Alternatively, when the hydraulic oil cylinder 14 is lifted to a set height, the second air pipe 202 is blocked by the limit valve 20, and at this time, the valve core of the lifting valve 13 moves from the lifting displacement to the middle position, and the hydraulic oil cylinder 14 stops lifting.
Optionally, the lifting position of the hydraulic oil cylinder 14 is detected by using the lifting limit switch 21, when the hydraulic oil cylinder 14 is lifted to a set height, the lifting limit switch 21 sends a first signal to the control system 19, and the control system 19 controls the lifting solenoid valve 16 to be powered off according to the first signal;
the descending position of the hydraulic oil cylinder 14 is detected by using the descending limit switch 22, when the hydraulic oil cylinder 14 descends to trigger the descending limit switch 22, the descending limit switch 22 sends a second signal to the control system 19, and the control system 19 controls the descending electromagnetic valve 18 to lose power according to the second signal.
Alternatively, the lifting shuttle valve 23 is connected to the second air pipe 202 of the lifting solenoid valve 16 and the lifting valve 13, and the descending shuttle valve 24 is connected to the third air pipe 203 of the descending solenoid valve 18 and the lifting valve 13;
when the lifting operation is manually controlled, the power takeoff switch is toggled to electrify the power takeoff electromagnetic valve 15, and the power takeoff electromagnetic valve 15 is electrified to start the hydraulic pump 12; the lifting handle 26 is shifted to a lifting position, gas output by the gas source passes through the lifting shuttle valve 23 to the lifting valve 13, the valve core of the lifting valve 13 is moved to the lifting position, and the hydraulic pump 12 pumps hydraulic oil of the oil tank assembly 11 to the hydraulic oil cylinder 14;
when the descending operation is manually controlled, the power takeoff switch is reset to ensure that the power takeoff electromagnetic valve 15 is de-energized, and the hydraulic pump 12 stops working; the lifting handle 26 is shifted to a descending position, gas output by the gas source passes through the descending shuttle valve 24 to the lifting valve 13, the valve core of the lifting valve 13 is moved to the descending position, and hydraulic oil in the hydraulic oil cylinder 14 flows back to the oil tank assembly 11 through the oil pipe 101.
The preferred embodiments of the present application have been described in detail with reference to the accompanying drawings, but the present application is not limited to the details of the above embodiments, and various simple modifications can be made to the technical solution of the present application within the technical idea of the present application, and these simple modifications are included in the scope of protection of the present application. The various features described in the foregoing detailed description may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, various possible combinations are not described separately in this application.
Claims (10)
1. The utility model provides a tipper system of lifting which characterized in that, includes oil tank assembly, hydraulic pump, lift valve, hydraulic cylinder, power takeoff solenoid valve, power takeoff, lifts solenoid valve, decline solenoid valve and control system, wherein:
the oil tank assembly, the hydraulic pump, the lifting valve and the hydraulic oil cylinder are sequentially connected through oil pipes; the power takeoff electromagnetic valve and the power takeoff are connected with an air source through a first air pipe, and the power takeoff is connected with the hydraulic pump; the lifting electromagnetic valve and the lifting valve are connected with the air source through a second air pipe; the descending electromagnetic valve and the lifting valve are connected with the air source through a third air pipe; the control system is respectively electrically connected with the power takeoff electromagnetic valve, the lifting electromagnetic valve and the descending electromagnetic valve;
when lifting operation is carried out, the control system controls the power takeoff electromagnetic valve and the lifting electromagnetic valve to be electrified, and the hydraulic pump pumps hydraulic oil of the oil tank assembly to the hydraulic oil cylinder;
when the hydraulic oil cylinder is in descending operation, the control system controls the descending electromagnetic valve to be electrified, and hydraulic oil in the hydraulic oil cylinder flows back to the oil tank assembly through the oil pipe.
2. The dump truck lifting system according to claim 1, wherein the dump truck lifting system further comprises a limit valve, the limit valve is connected to the second air pipe between the lifting solenoid valve and the lifting valve, when the hydraulic cylinder is lifted to a set height, the limit valve blocks the second air pipe, a valve core of the lifting valve moves to a middle position, and the hydraulic cylinder stops lifting.
3. The dump truck lifting system as recited in claim 2, wherein the dump truck lifting system further comprises a lifting limit switch, the lifting limit switch is electrically connected with the control system, the lifting limit switch is used for detecting the lifting position of the hydraulic oil cylinder, when the hydraulic oil cylinder is lifted to a set height, the lifting limit switch sends a first signal to the control system, and the control system controls the lifting solenoid valve and the power takeoff solenoid valve to be powered off according to the first signal.
4. The dump truck lifting system according to claim 1, further comprising a lowering limit switch electrically connected to the control system, wherein the lowering limit switch is configured to detect a lowering position of the hydraulic cylinder, and when the hydraulic cylinder is lowered to trigger the lowering limit switch, the lowering limit switch sends a second signal to the control system, and the control system controls the lowering solenoid valve to be de-energized according to the second signal.
5. The dump truck lifting system as set forth in claim 1, further comprising a lifting shuttle valve and a lowering shuttle valve, wherein the lifting shuttle valve is connected to the second air pipe of the lifting solenoid valve and the lifting valve, and the lowering shuttle valve is connected to the third air pipe of the lowering solenoid valve and the lifting valve.
6. The dump truck lifting system as recited in claim 5, further comprising a power take-off switch and a lifting handle, wherein the power take-off switch is electrically connected to the power take-off solenoid valve, and the power take-off switch is used for controlling power on and power off of the power take-off solenoid valve; the lifting handle is connected with the lifting shuttle valve through the second air pipe and connected with the descending shuttle valve through the third air pipe, and when the lifting handle is used for controlling the air source to be communicated with the lifting shuttle valve and the lifting valve and controlling the air source to be communicated with the descending shuttle valve and the lifting valve.
7. A dump truck lifting method characterized in that the dump truck lifting method is used for the dump truck lifting system according to any one of claims 1 to 6, and the dump truck lifting method comprises:
when the lifting operation is carried out, the control system is utilized to control the power takeoff electromagnetic valve and the lifting electromagnetic valve to be electrified, and the power takeoff electromagnetic valve is electrified to start the hydraulic pump; the lifting electromagnetic valve is electrified, so that gas output by the gas source passes through the lifting electromagnetic valve to reach the lifting valve, a valve core of the lifting valve is moved to a lifting position, and the hydraulic pump pumps hydraulic oil of the oil tank assembly to the hydraulic oil cylinder;
when the hydraulic oil cylinder is in descending operation, the control system is utilized to control the descending electromagnetic valve to be electrified, the descending electromagnetic valve is electrified to enable gas output by the gas source to pass through the descending electromagnetic valve to the lifting valve, the valve core of the lifting valve is enabled to move to a descending position, and hydraulic oil in the hydraulic oil cylinder flows back to the oil tank assembly through the oil pipe.
8. The dump truck lifting method according to claim 7, wherein when the hydraulic cylinder is lifted to a set height, the second air pipe is blocked by a limit valve, and at this time, the valve core of the lifting valve moves from the lifting displacement to a middle position, and the hydraulic cylinder stops lifting.
9. The dump truck lifting method according to claim 8, wherein a lifting limit switch is used to detect the lifting position of the hydraulic cylinder, when the hydraulic cylinder is lifted to a set height, the lifting limit switch sends a first signal to the control system, and the control system controls the lifting solenoid valve to be de-energized according to the first signal;
and detecting the descending position of the hydraulic oil cylinder by using a descending limit switch, sending a second signal to the control system by using the descending limit switch when the hydraulic oil cylinder descends to trigger the descending limit switch, and controlling the descending electromagnetic valve to lose power by using the control system according to the second signal.
10. The dump truck lifting method according to claim 7, wherein a lifting shuttle valve is connected to the second air pipe of the lifting solenoid valve and the lifting valve, and a lowering shuttle valve is connected to the third air pipe of the lowering solenoid valve and the lifting valve;
when the lifting operation is manually controlled, a power takeoff switch is toggled to enable a power takeoff electromagnetic valve to be electrified, and the power takeoff electromagnetic valve is electrified to enable a hydraulic pump to be started; shifting a lifting handle to a lifting position, enabling gas output by the gas source to pass through the lifting shuttle valve to reach the lifting valve, enabling a valve core of the lifting valve to move to the lifting position, and enabling the hydraulic pump to pump hydraulic oil of the oil tank assembly to the hydraulic oil cylinder;
when the descending operation is manually controlled, the power takeoff switch is reset, so that the power takeoff electromagnetic valve is de-energized, and the hydraulic pump stops working; and shifting the lifting handle to a descending position, enabling gas output by the gas source to pass through the descending shuttle valve to the lifting valve, enabling a valve core of the lifting valve to move to the descending position, and enabling hydraulic oil in the hydraulic oil cylinder to flow back to the oil tank assembly through the oil pipe.
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| CN114132243B (en) | 2023-01-24 |
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