Hood Lifting and Battery Locking Control System and Electric Construction Machinery

Abstract

The present invention relates to electric construction machinery. To solve the problem that the locking of the battery of existing electric construction machinery has no association with the closing of the engine hood, the present invention constructs a control system for the lifting of the engine hood and the locking of the battery and an electric construction machinery. The control system includes a solenoid valve for controlling the lifting of the engine hood, a solenoid valve for controlling the locking of the battery, a controller, a control switch for the lifting of the engine hood, a control switch for the locking of the battery, and an engine hood attitude detector. The controller is used to output corresponding control currents for lifting the engine hood, lowering the engine hood, and stopping the engine hood to the solenoid valve for controlling the lifting of the engine hood according to the status signal of the control switch for the lifting of the engine hood, and output corresponding control currents for locking the battery, unlocking the battery, and stopping the locking to the solenoid valve for controlling the locking of the battery according to the status signal of the control switch for the locking of the battery when receiving the full engine hood lifting status signal output by the engine hood attitude detector. The present invention can avoid the misoperation of unlocking the battery lock when the engine hood is in the closed state.

Description

Technical Field

[0001] The present invention relates to an electric construction machinery, and more specifically, to a hood lifting and battery locking control system and an electric construction machinery. Background Art

[0002] The power batteries equipped on electric construction machinery such as electric loaders and electric excavators are usually arranged on the vehicle body in a detachable and quick-change form, and are shielded by covering parts such as hoods for protection, and the power batteries are replaced when the power of the power batteries is exhausted.

[0003] The maintenance, repair and replacement of the power battery require opening the hood. The hood is heavy in mass, and its opening and closing need to be assisted by a power device, such as a hydraulic cylinder. The power battery is huge in mass, and it needs to be firmly locked when installed on the construction machinery. The locking pin for locking the power battery is usually driven by a hydraulic cylinder to expand and contract.

[0004] On the existing electric construction machinery, the locking and unlocking of the power battery and the lifting and opening and closing operations of the hood are independent of each other, and there is a situation where the power battery is unlocked when the hood is not lifted and opened, resulting in the risk that the power battery overturns due to the movement of the mechanical device without being locked. Summary of the Invention

[0005] The technical problem to be solved by the present invention is the problem that the battery locking and the hood closing of the existing electric construction machinery are not related, and a hood lifting and battery locking control system and an electric construction machinery are provided, so that there is a logical relationship between the closing action of the hood and whether the battery is locked or not, and accidents are avoided.

[0006] The technical solution for the present invention to achieve its purpose is as follows: A hood lifting and battery locking control system is constructed, including a hood lifting hydraulic cylinder for lifting the hood, a hood lifting control solenoid valve for controlling the hood lifting hydraulic cylinder, a battery locking hydraulic cylinder for locking the power battery, a battery locking control solenoid valve for controlling the battery locking hydraulic cylinder, an oil pump connected to the oil inlet ports of the battery locking control solenoid valve and the hood lifting control solenoid valve, and a motor for driving the oil pump; characterized in that the control system further includes a controller electrically connected to the hood lifting control solenoid valve and the battery locking control solenoid valve, a hood lifting control switch, a battery locking control switch electrically connected to the controller, and a hood attitude detector for detecting the opening and closing state of the hood;

[0007] The controller is used to output corresponding control currents for hood lifting, hood lowering, and hood stopping to the hood lifting control solenoid valve according to the status signal of the hood lifting control switch, and output corresponding control currents for battery locking, battery unlocking, and locking stop to the battery locking control solenoid valve according to the status signal of the battery locking control switch when receiving the fully lifted hood status signal output by the hood attitude detector.

[0008] In the present invention, the battery can be unlocked and locked only when the hood is in the fully lifted state. When the hood is not opened or not fully opened, the unlocking operation of the battery lock cannot be performed, thus preventing the risk caused by misoperation.

[0009] In the hood lifting and battery locking control system of the present invention, a pilot-operated check valve that conducts forwardly towards the battery locking oil cylinder is connected between the large chamber of the battery locking oil cylinder and the working oil port of the battery locking control solenoid valve, and the reverse conduction control end of the pilot-operated check valve is communicated with the small chamber of the battery locking oil cylinder.

[0010] In the hood lifting and battery locking control system of the present invention, both the battery locking control solenoid valve and the hood lifting control solenoid valve are three-position four-way valves. The oil inlet of at least one of the battery locking control solenoid valve and the hood lifting control solenoid valve is connected to the oil inlet end of an overflow valve, and the oil outlet end of the overflow valve is connected to the return oil pipeline.

[0011] In the hood lifting and battery locking control system of the present invention, the two working oil ports of the hood lifting control solenoid valve are respectively connected to the large chamber and the small chamber of the hood lifting oil cylinder; the two working oil ports of the battery locking control solenoid valve are respectively connected to the large chamber and the small chamber of the battery locking oil cylinder.

[0012] In the hood lifting and battery locking control system of the present invention, the start-stop control device of the motor is electrically connected to the controller. The controller outputs a motor start control signal to the start-stop control device of the motor when receiving the status signal of hood lifting or hood lowering output by the hood lifting control switch, or when receiving the fully lifted hood status signal output by the hood attitude detector and receiving the status signals of battery locking and battery unlocking.

[0013] In the hood lifting and battery locking control system of the present invention, when the controller outputs the hood lifting control current or the hood lowering control current, after receiving the fully lifted hood status signal or the fully lowered hood status signal output by the hood attitude detector, it outputs the hood stop control current and outputs a motor stop control signal to the start-stop control device of the motor.

[0014] In the hood lifting and battery locking control system of the present invention, the control system further includes a battery status detector for detecting the battery locking status. When the controller receives the battery locking complete status signal or the battery unlocking complete status signal output by the battery status detector while outputting the battery locking control current or the battery unlocking control current, it outputs the locking stop control current and outputs a motor stop control signal to the start-stop control device of the motor.

[0015] The technical solution for the present invention to achieve its purpose is as follows: An electric construction machinery is constructed, which is characterized by having the aforementioned hood lifting and battery locking control system. The electric construction machinery can be an excavator, a loader, etc.

[0016] Compared with the prior art, in the present invention, the locking and unlocking operations of the power battery are associated with the status of the hood. The unlocking operation of the battery lock cannot be performed when the hood is not opened, thus preventing the risks caused by misoperations. Brief Description of the Drawings

[0017] Figure 1 is the schematic diagram of the hood lifting and battery locking control system of the present invention.

[0018] Names and serial numbers of components in the figure:

[0019] Hydraulic oil tank 1, oil pump 2, overflow valve 3, battery locking control solenoid valve 4, hydraulic control check valve 5, battery locking cylinder 6, battery status detector 7, hood attitude detector 8, hood lifting cylinder 9, hood lifting control solenoid valve 10, hood lifting control switch 11, controller 12, battery locking control switch 13, motor 14. Detailed Embodiment

[0020] The following describes the specific implementation manners in conjunction with the drawings.

[0021] Figure 1 shows the principle of the hood lifting and battery locking control system in an embodiment of the present invention.

[0022] As Figure 1As shown in the figure, the hood lifting and battery locking control system includes a hood lifting oil cylinder 9 for lifting the hood, a hood lifting control solenoid valve 10 for controlling the hood lifting oil cylinder 9, a battery locking oil cylinder 6 for locking and fixing the power battery, a battery locking control solenoid valve 4 for controlling the battery locking oil cylinder 6, an oil pump 2 connected to the oil inlets of the battery locking control solenoid valve 4 and the hood lifting control solenoid valve 10, a motor 14 for driving the oil pump 2, a controller 12 electrically connected to the hood lifting control solenoid valve 10 and the battery locking control solenoid valve 4, a hood lifting control switch 11 electrically connected to the controller 12, a battery locking control switch 13, a hood attitude detector 8 for detecting the opening and closing state of the hood, and a battery state detector 7 for detecting whether the battery is locked.

[0023] The oil suction port of the oil pump 2 is connected to the hydraulic oil tank 1 through a filter and a pipeline, and sucks hydraulic oil from the hydraulic oil tank 1. The pump port of the oil pump 2 is connected to the oil inlets of the battery locking control solenoid valve 4 and the hood lifting control solenoid valve 10 through a check valve and a pipeline, and the oil return ports of the battery locking control solenoid valve 4 and the hood lifting control solenoid valve 10 are connected to the hydraulic oil tank 1 through a pipeline.

[0024] One of the working oil ports of the battery locking control solenoid valve 4 is connected to the forward conduction oil inlet of the pilot-operated check valve 5, the forward conduction oil outlet of the pilot-operated check valve 5 is connected to the large chamber of the battery locking oil cylinder 6, and the other working oil port of the battery locking control solenoid valve 4 is connected to the reverse conduction control oil port of the pilot-operated check valve 5 and the small chamber of the battery locking oil cylinder 6 at the same time.

[0025] The two working oil ports of the hood lifting control solenoid valve 10 are respectively connected to the large chamber and the small chamber of the hood lifting oil cylinder 9.

[0026] Both the hood lifting control solenoid valve 10 and the battery locking control solenoid valve 4 are three-position four-way valves. When the hood lifting control solenoid valve 10 is in the left position, its oil inlet communicates with the large chamber of the hood lifting oil cylinder 9; when it is in the right position, its oil inlet communicates with the small chamber of the hood lifting oil cylinder 9; when it is in the middle position, its oil inlet is cut off from the hood lifting oil cylinder 9. When the battery locking control solenoid valve 4 is in the left position, its oil inlet communicates with the large chamber of the battery locking oil cylinder 6; when it is in the right position, its oil inlet communicates with the small chamber of the battery locking oil cylinder 6; when it is in the middle position, its oil inlet is cut off from the battery locking oil cylinder 6.

[0027] An overflow valve 3 is provided in either one of the two valves, the hood lifting control solenoid valve 10 and the battery locking control solenoid valve 4, or in both valves. The overflow valve 3 is connected between the oil inlet end and the oil return end of the valve. When both the hood lifting control solenoid valve 10 and the battery locking control solenoid valve 4 are in the middle position, the overflow valve 3 automatically opens and overflows due to the continuous increase in the pump port pressure of the oil pump 2.

[0028] The hood lifting control switch 11 and the battery locking control switch 13 both have three states, corresponding to three operating electrical signals recognizable by the controller 12. The three operating electrical signals of the hood lifting control switch 11 are respectively the hood lifting state signal for the hood lifting operation, the hood lowering state signal for the hood lowering operation, and the hood stop state signal for the hood stop operation. The three operating electrical signals of the battery locking control switch 13 are respectively the battery locking state signal for the battery locking operation, the battery unlocking state signal for the battery unlocking operation, and the locking stop state signal for the locking stop operation.

[0029] The hood attitude detector 8 can be an angle sensor for detecting the flipping angle of the hood, or a displacement sensor for detecting the telescopic length of the hood lifting oil cylinder 9. The controller 12 can judge whether the hood is fully opened or lowered and closed completely according to the angle signal of the angle sensor or the displacement signal of the displacement sensor. The hood attitude detector 8 can also be two proximity switches, which are triggered respectively when the hood is fully opened and lowered and closed completely. The controller 12 judges the state of the hood according to the state signal of the proximity switch.

[0030] The battery state detector 7 can be a displacement sensor for detecting the telescopic length of the battery locking oil cylinder 6. The controller 12 can judge whether the battery is fully locked or unlocked according to the displacement signal of the displacement sensor. The battery state detector 7 can also be two proximity switches, which are triggered respectively when the battery locking oil cylinder 6 extends completely and the battery locking oil cylinder 6 retracts completely. The controller 12 judges the battery locking or unlocking state according to the state signal of the proximity switch.

[0031] The controller 12 is used to output corresponding control currents for hood lifting, hood lowering, and hood stopping to the hood lifting control solenoid valve 10 according to the state signal of the hood lifting control switch 11. When receiving the fully lifted state signal of the hood output by the hood attitude detector 8, the controller 12 outputs corresponding control currents for battery locking, battery unlocking, and locking stop to the battery locking control solenoid valve 4 according to the state signal of the battery locking control switch 13.

[0032] The operator operates the hood lifting control switch 11 to send the hood lifting state signal for the hood lifting operation, the hood lowering state signal for the hood lowering operation, and the hood stop state signal for the hood stop operation to the controller 12. When receiving the hood lifting state signal and the hood lowering state signal, the controller 12 outputs a motor start control signal to the start-stop control device of the motor 14, and at the same time outputs corresponding hood lifting control current and hood lowering control current to the hood lifting control solenoid valve 10. The motor 14 rotates to drive the oil pump 2, and the oil pump 2 outputs pressurized oil. The hood lifting control solenoid valve 10 is correspondingly in the left position and the right position, the hood lifting oil cylinder 9 correspondingly performs extension and retraction actions, and the hood correspondingly performs lifting and lowering operations.

[0033] When receiving the hood lifting complete status signal or the hood lowering complete status signal output by the hood attitude detector 8, the controller 12 outputs a hood stop control current and outputs a motor stop control signal to the start-stop control device of the motor 14. The hood lifting and lowering control solenoid valve 10 commutates to the middle position, and the hood lifting and lowering oil cylinder 9 stops telescoping. The motor 14 stops rotating, and the oil pump 2 stops outputting pressure oil.

[0034] When receiving the hood stop status signal, the controller 12 outputs a hood stop control current to the start-stop control device of the motor 14. The hood stop control current is usually zero. The hood lifting and lowering control solenoid valve 10 commutates to the middle position, and the hood lifting and lowering oil cylinder 9 stops telescoping. When receiving the hood stop status signal, the controller 12 can simultaneously output a motor stop control signal to the start-stop control device of the motor 14, or output a motor stop control signal to the start-stop control device of the motor 14 when no hood lifting status signal, hood lowering status signal, battery locking status signal, or battery unlocking status signal is received within a predetermined time, causing the motor to stop rotating.

[0035] When the controller 12 receives the battery locking status signal and the battery unlocking status signal of the battery locking control switch 13, it determines whether the hood is fully lifted through the signal output by the hood attitude detector 8. If the hood attitude detector 8 outputs a hood lifting complete status signal, the controller 12 outputs corresponding battery locking control current and battery unlocking control current to the battery locking control solenoid valve 4 according to the status signal of the battery locking control switch 13. The battery locking control solenoid valve 4 accordingly is in the left position or the right position, and the battery locking oil cylinder 6 accordingly makes an extending or retracting action to achieve the locking and fixing or unlocking action of the battery.

[0036] When the controller 12 receives the hood lifting complete status signal output by the hood attitude detector 8 and receives the status signals of battery locking and battery unlocking, it also outputs a motor start control signal to the start-stop control device of the motor 14. The motor starts to drive the oil pump 2 to work, and the oil pump 2 outputs pressure oil.

[0037] If the controller 12 receives the battery locking complete status signal or the battery unlocking complete status signal output by the battery status detector 7 when outputting the battery locking control current or the battery unlocking control current, the controller 12 outputs a locking stop control current (usually a zero-value current). The battery locking control solenoid valve 4 accordingly is in the middle position, and the battery locking oil cylinder 6 stops telescoping and maintains the current locking or unlocking state of the battery.

[0038] When the controller 12 outputs the locking stop control current after outputting the battery locking control current and the battery unlocking control current, it can simultaneously output a motor stop control signal to the start-stop control device of the motor 14, or output a motor stop control signal to the start-stop control device of the motor when it does not receive the hood lifting state signal, the hood lowering state signal, the battery locking state signal, and the battery unlocking state signal within a predetermined time, so that the motor stops rotating.

[0039] This embodiment also discloses an electric construction machinery, which can be an electric excavator, an electric loader, etc., and has the aforementioned hood lifting and battery locking control system.

Claims

1. A hood lifting and battery locking control system, comprising a hood lifting oil cylinder for lifting the hood, a hood lifting control solenoid valve for controlling the hood lifting oil cylinder, a battery locking oil cylinder for locking the power battery, a battery locking control solenoid valve for controlling the battery locking oil cylinder, an oil pump connected to the oil inlets of the battery locking control solenoid valve and the hood lifting control solenoid valve, and a motor for driving the oil pump; characterized in that, The control system further includes a controller electrically connected to the hood lifting control solenoid valve and the battery locking control solenoid valve, a hood lifting control switch, a battery locking control switch electrically connected to the controller, and a hood attitude detector for detecting the opening and closing state of the hood; The controller is configured to output corresponding control currents for hood lifting, hood lowering, and hood stopping to the hood lifting control solenoid valve according to the status signal of the hood lifting control switch, and output corresponding control currents for battery locking, battery unlocking, and locking stopping to the battery locking control solenoid valve according to the status signal of the battery locking control switch when receiving the fully lifted hood status signal output by the hood attitude detector.

2. The hood lifting and battery locking control system according to claim 1, characterized in that, A hydraulic check valve that conducts forwardly towards the battery locking cylinder is connected between the large chamber of the battery locking cylinder and the working oil port of the battery locking control solenoid valve, and the reverse conduction control end of the hydraulic check valve communicates with the small chamber of the battery locking cylinder.

3. The hood lifting and battery locking control system according to claim 1, characterized in that, Both the battery locking control solenoid valve and the hood lifting control solenoid valve are three-position four-way valves. The inlet oil port of at least one of the battery locking control solenoid valve and the hood lifting control solenoid valve is connected to the inlet end of a relief valve, and the outlet end of the relief valve is connected to the return oil line.

4. The hood lifting and battery locking control system according to claim 3, wherein, The two working oil ports of the hood lifting control solenoid valve are respectively connected to the large chamber and the small chamber of the hood lifting cylinder; the two working oil ports of the battery locking control solenoid valve are respectively connected to the large chamber and the small chamber of the battery locking cylinder.

5. The hood lifting and battery locking control system according to any one of claims 1 to 4, characterized in that, The start-stop control device of the motor is electrically connected to the controller. The controller outputs a motor start control signal to the start-stop control device of the motor when receiving the status signal of hood lifting or hood lowering output by the hood lifting control switch, or when receiving the fully lifted hood status signal output by the hood attitude detector and receiving the status signals of battery locking and battery unlocking.

6. The hood lifting and battery locking control system according to any one of claims 1 to 4, characterized in that, When the controller outputs the hood lifting control current or the hood lowering control current, after receiving the fully lifted hood status signal or the fully lowered hood status signal output by the hood attitude detector, it outputs the hood stopping control current and outputs a motor stop control signal to the start-stop control device of the motor.

7. The hood lifting and battery locking control system according to claim 6, wherein, The hood attitude detector can be at least one of an angle sensor, a displacement sensor, and a proximity switch. Among them, the angle sensor is used to detect the flipping angle of the hood, the displacement sensor is used to detect the telescopic length of the hood lifting cylinder, and the proximity switch is used to trigger respectively when the hood is fully opened and fully lowered and closed.

8. The hood lifting and battery locking control system according to any one of claims 1, characterized in that, The control system further includes a battery status detector for detecting the battery locking state. The controller outputs the locking stop control current and outputs a motor stop control signal to the start-stop control device of the motor when receiving the fully locked battery status signal or the fully unlocked battery status signal output by the battery status detector when outputting the battery locking control current or the battery unlocking control current.

9. The hood lifting and battery locking control system according to claim 8, wherein, The battery state detector may be at least one of a displacement sensor and a proximity switch. Among them, the displacement sensor is used to detect the telescopic length of the hood lifting oil cylinder, and the proximity switch is used to trigger respectively when the hood is fully opened and fully closed.

10. An electric construction machinery, characterized in that, It has the hood lifting and battery locking control system according to any one of claims 1 to 9.

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