Portable power unit and crane thereof

Abstract

The invention discloses a portable power unit and a crane thereof, a battery is provided with a temperature alarm module, the battery is connected with a motor and a charging device through a circuit for storing and outputting electric energy, and the battery is connected with a radiator through a circuit; the hydraulic pump comprises at least one electric control variable pump and at least one gear pump; the hydraulic pump is connected with a crane hydraulic system through a hydraulic pipeline; the motor comprises a driving motor and converts electric energy output by the battery into mechanical energy used by the hydraulic pump; the charging device comprises a charging cable and a charger. The system can be used for a traditional fuel crane, the problems that a battery of a pure electric crane is high in price and high in cost are solved, and an electric control system for complex chassis driving and loading operation is not needed; a pure electric or plug-in working mode can be used, and the continuous working time can be effectively prolonged under the plug-in working condition compared with a pure electric crane; and a plug-in mode is used, so that the situation that the vehicle can be charged only after parking, flameout and stop working is avoided.

Description

Technical Field

[0001] The invention relates to the field of cranes, and in particular to a portable power unit and a crane thereof. Background Art

[0002] There are two system architectures in the wheeled crane industry. The mainstream is the traditional fuel crane driven by engine fuel. The advantage is that the crane is suitable for various construction sites. The disadvantage is that the engine needs to continuously drive the hydraulic system to work during operation. The engine has a large power surplus. Combined with its intermittent operation characteristics, the fuel consumed during operation produces a low proportion of useful work, that is, the fuel utilization rate is low. At the same time, the transmission fuel crane will inevitably produce carbon, nitrogen and other compounds when the engine is working, causing pollution to the atmosphere, water and soil.

[0003] The other is a pure electric system, which eliminates the engine and uses a large-capacity power battery as the energy source. The advantages are low electricity prices, low operating costs, and clean and environmentally friendly. The disadvantages are high costs and complex electronic control systems that take into account chassis driving and onboard operations. The reason is that the battery required for the crane to operate continuously for 1 day is expensive, the crane is heavy, and the pure electric-driven crane has a small range of travel.

[0004] Limited by the efficiency of traditional fuel engines, fuel utilization is low and economic benefits are poor. Especially after the implementation of high emission standards, the engine maintenance cost is high; therefore, new energy cranes have become a trend. The pure electric cranes in the prior art cancel the engine and use power batteries to provide power for the control circuit of the crane. The prior art is such as "Power system and crane for crane" (CN 217778346 U), in which the main drive motor is controlled by a power coupling device and can be used as a generator or a motor.

[0005] However, the existing technology has the following problems: 1. The battery of pure electric crane is expensive, the cost is high, and the electronic control system of chassis driving and loading operation is complicated; 2. The crane is heavy, and the range of pure electric crane to transfer is small without charging, and the environmental applicability is limited; 3. Pure electric crane needs to be charged regularly and cannot operate continuously for a long time. Therefore, it is necessary to develop a new type of crane to overcome the above problems. Summary of the invention

[0006] Purpose of the invention: In view of the shortcomings and defects of the prior art, the present invention provides a portable power unit and a crane thereof, which can be used in traditional fuel cranes, overcome the problem of expensive batteries and high costs of pure electric cranes, and do not require a complex chassis driving and electronic control system for on-board operations; it can use pure electric or plug-in working modes, and the plug-in working condition can effectively increase the continuous working time compared to pure electric cranes; using plug-in avoids the need for the vehicle to be parked, turned off and stopped working before charging.

[0007] Technical solution: A portable power unit of the present invention is characterized in that: it includes a portable power unit, the portable power unit is provided with a battery, a hydraulic pump, a motor, a charging device and a radiator; the battery is provided with a temperature alarm module, the battery is connected to the motor and the charging device through a circuit for storing and outputting electrical energy, and the battery is connected to the radiator through a circuit; the hydraulic pump includes at least one electronically controlled variable pump and at least one gear pump, and the hydraulic pump is connected to the crane hydraulic system through a hydraulic pipeline; the motor includes a drive motor, and the motor converts the electrical energy output by the battery into mechanical energy used by the hydraulic pump; the charging device includes a charging cable and a charger.

[0008] Wherein, the battery is provided with a temperature alarm module. When the temperature of the battery is higher than the set temperature threshold, the instrument panel alarms, the radiator power increases, and the power of other working systems decreases.

[0009] Among them, the electronically controlled variable pump of the hydraulic pump controls the flow of the hydraulic circuit, and the gear pump of the hydraulic pump converts the mechanical energy generated by the motor into hydraulic energy, thereby realizing the control of the upper vehicle rotation and luffing action and the lower vehicle outrigger and suspension action.

[0010] Among them, when the motor is plugged in, it converts the electrical energy output by the external power supply into mechanical energy through the charging device, thereby driving the crane operation.

[0011] Wherein, when the charging device is in pure electric working condition, the external power source charges the battery through the charging device.

[0012] Wherein, when the charging device is in plugged-in condition, the external power supply provides electrical energy to the motor or supplies power to the battery through the charging device.

[0013] Wherein, the portable power unit is installed on the frame of the crane through a bracket, or is arranged around the crane; the portable power unit is connected to the hydraulic system of the crane through hydraulic pipelines and circuits, and the hydraulic socket of the portable power unit used for connection to the crane is a quick connector; the hydraulic pipeline of the portable power unit and the hydraulic pipeline of the crane are connected by a shuttle valve or an electrically controlled selection valve before entering the central rotating body.

[0014] The method for using the portable power unit of the present invention is characterized in that: the crane is connected to the portable power unit, and the working mode is selected according to whether the portable power unit is connected to an external power supply. If the portable power unit is not connected to the external power supply, it enters a pure electric working state, the power source of the crane is the electric energy stored in the battery, the motor converts the electric energy into mechanical energy, the hydraulic pump converts the mechanical energy into hydraulic energy, and the control of the upper vehicle slewing and luffing action and the lower vehicle outrigger and suspension action is realized through the crane's upper and lower vehicle hydraulic systems; when the battery power is low, the crane prompts that the power is low.

[0015] Among them, if the portable power unit is connected to an external power supply, it enters the plug-in condition. The power source of the crane is the electric energy supplied by the external power supply. The external power supply transmits the electric energy to the motor through the charging device. The motor converts the electric energy into mechanical energy. The hydraulic pump converts the mechanical energy into hydraulic energy. The control of the upper and lower vehicle hydraulic systems of the crane is realized, including the control of the upper vehicle slewing and luffing movements and the lower vehicle outriggers and suspension movements.

[0016] A crane using the portable power unit of the present invention.

[0017] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: the present invention can be used for traditional fuel cranes, overcoming the problem of expensive and high-cost batteries for pure electric cranes, and does not require a complex chassis driving and electronic control system for on-board operations. The present invention can use pure electric or plug-in working modes according to whether an external power supply is used. Compared with pure electric cranes, the plug-in working mode can effectively increase the continuous working time; the use of plug-in avoids the need for the vehicle to be parked, turned off and stopped working before charging. The vehicle adapted to the present invention is a traditional fuel crane with an engine structure, which has better adaptability than pure electric cranes during the transfer process and in harsh construction environments where external power supply is not available. Compared with traditional fuel cranes, the present invention can use pure electric and plug-in working modes during lifting operations, reduce working noise and exhaust emissions, and is green and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A power supply system diagram of a pure electric crane in the prior art;

[0019] Figure 2 It is a structural schematic diagram of the present invention;

[0020] Figure 3 It is a working principle diagram of the present invention;

[0021] Figure 4 This is a pure electric working mode diagram of the present invention;

[0022] Figure 5 This is a diagram of the plug-in working mode of the present invention;

[0023] In the figure, 1 is a portable power unit; 2 is a crane; 101 is a battery; 102 is a hydraulic pump; 103 is a motor; 104 is a charging device; and 105 is a radiator. DETAILED DESCRIPTION

[0024] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0025] The power system of the present invention refers to a system in which the power of the power source is finally transmitted to the wheels through a series of power transmissions. New energy crane refers to crane equipment that does not use fuel but uses new energy as a power source, often including pure electric and hybrid. Zero emission refers to infinitely reducing pollutant and energy emissions to zero, without leaving any waste to the atmosphere, water bodies and soil. Center slewing body: a core component used to connect the chassis and the upper body for rotating operations, including a rotating sealed hydraulic oil channel and brushes, which can transmit the hydraulic power and electrical signals of the chassis and the upper body without being affected by the rotation of the upper body.

[0026] A portable power unit of the present invention includes a portable power unit 1, which is provided with a battery 101, a hydraulic pump 102, a motor 103, a charging device 104 and a radiator 105; the battery 101 is provided with a temperature alarm module, the battery 101 is connected to the motor 103 and the charging device 104 through a circuit for storing and outputting electric energy, and the battery 101 is connected to the radiator 105 through a circuit; the hydraulic pump 102 includes at least one electronically controlled variable pump and at least one gear pump, and the hydraulic pump 102 is connected to the hydraulic system of the crane 2 through a hydraulic pipeline; the motor 103 includes a driving motor, and the motor 103 converts the electric energy output by the battery 101 into mechanical energy used by the hydraulic pump 102; the charging device 104 includes a charging cable and a charger. Among them, the battery 101 is provided with a temperature alarm module, and when the temperature of the battery 101 is higher than the set temperature threshold, the instrument panel alarms, the power of the radiator 105 increases, and the power of the other working systems decreases. The electronically controlled variable pump of the hydraulic pump 102 controls the flow of the hydraulic circuit, and the gear pump of the hydraulic pump 102 converts the mechanical energy generated by the motor 103 into hydraulic energy, thereby controlling the upper vehicle slewing and luffing movements and the lower vehicle outrigger and suspension movements. In the plug-in condition, the motor 103 converts the electrical energy output by the external power supply into mechanical energy through the charging device 104, thereby driving the crane 2 to operate. In the pure electric condition, the external power supply charges the battery 101 through the charging device 104. In the plug-in condition, the external power supply provides electrical energy to the motor 103 through the charging device 104, or supplies power to the battery 101.

[0027] The portable power unit 1 of the present invention is installed on the frame of the crane 2 through a bracket, or is arranged around the crane 2; the portable power unit 1 is connected to the hydraulic system of the crane 2 through hydraulic pipelines and circuits, and the hydraulic socket of the portable power unit 1 used for connection to the crane 2 is a quick connector; the hydraulic pipeline of the portable power unit 1 and the hydraulic pipeline of the crane 2 are connected by a shuttle valve or an electrically controlled selection valve before entering the central rotating body.

[0028] The method for using the portable power unit of the present invention is that the crane 2 is connected to the portable power unit 1, and the working mode is selected according to whether the portable power unit 1 is connected to an external power supply. If the portable power unit 1 is not connected to an external power supply, it enters a pure electric working state, and the power source of the crane 2 is the electric energy stored in the battery 101. The motor 103 converts the electric energy into mechanical energy, and the hydraulic pump 102 converts the mechanical energy into hydraulic energy. The hydraulic system for getting on and off the vehicle of the crane 2 is used to control the slewing and luffing action of the vehicle and the action of the outriggers and suspension of the vehicle; when the battery 101 is insufficient, the crane 2 prompts that the power is insufficient. If the portable power unit 1 is connected to an external power supply, it enters a plug-in working state, and the power source of the crane 2 is the electric energy supplied by the external power supply. The external power supply transmits the electric energy to the motor 103 through the charging device 104. The motor 103 converts the electric energy into mechanical energy, and the hydraulic pump 102 converts the mechanical energy into hydraulic energy. The hydraulic system for getting on and off the vehicle of the crane 2 is used to control the slewing and luffing action of the vehicle and the action of the outriggers and suspension of the vehicle.

[0029] The portable power unit of the present invention is detachable and movable, including but not limited to lifting and moving by the crane and towing by a trailer. The connections between the hydraulic, electrical, bracket, etc. of the portable power unit and the crane can be repeatedly disassembled, wherein the hydraulic pipeline and the hydraulic pipeline of the crane are connected by a shuttle valve or an electrically controlled selection valve before entering the central rotating body, and can be used for traditional fuel cranes as well as existing pure electric cranes. The portable power unit can supply pure electric power to the crane operation, and can also be connected to an external power supply to supply power to the crane operation, and the power supply mode can be selected automatically or manually according to whether the external power supply is connected. The portable power unit provides power for the actions of getting on and off the crane, and getting on the vehicle includes but is not limited to rotation, amplitude change, lifting, and telescopic actions, and getting off the vehicle includes but is not limited to outrigger and suspension actions.

[0030] The present invention can use pure electric or plug-in operation when loading and unloading, which reduces the cost of use and maintenance and meets the operation requirements of some zero-emission areas. The present invention is easy to install and can provide a new energy crane modification solution for cranes that have already used transmission fuel systems on the market. Under pure electric operation conditions, the power battery directly supplies energy, and the drive motor converts the power battery's electrical energy into hydraulic energy used by the hydraulic pump to achieve the loading and unloading movements and the chassis vehicle's outriggers and suspension movements; under plug-in operation conditions, the energy used by the vehicle is external electrical energy input through the charging device, and the motor converts it into hydraulic energy for operation. Compared with existing pure electric cranes, cranes carrying portable power units have the advantages of pure electric cranes while achieving the following: (1) The engine burns diesel to supply energy during the chassis process, effectively improving the transfer capability. (2) It can be plugged in with an external power supply to achieve long-term electric drive operation. (3) The portable power unit has a hoisting structure and can be hoisted by a crane for transfer or transported by a trailer. (4) It can achieve all loading and unloading movements and the outriggers and suspension movements. The crane can be plugged in and operated purely electrically. The hydraulic pump can be driven by an electric motor to realize all the movements of getting on the vehicle and the movements of the outriggers and suspension when getting off the vehicle. While the vehicle can operate electrically, it retains the engine, which is conducive to the crane's transfer and travel.

Claims

1. A portable power unit, characterized in that: The portable power unit (1) comprises a battery (101), a hydraulic pump (102), a motor (103), a charging device (104) and a radiator (105); the battery (101) is provided with a temperature alarm module; the battery (101) is connected to the motor (103) and the charging device (104) through a circuit for storing and outputting electric energy; the battery (101) is connected to the radiator (105) through a circuit; the hydraulic pump (102) comprises at least one electrically controlled variable pump and at least one gear pump; the hydraulic pump (102) is connected to the hydraulic system of a crane (2) through a hydraulic pipeline; the motor (103) comprises a driving motor; the motor (103) converts the electric energy output by the battery (101) into mechanical energy used by the hydraulic pump (102); the charging device (104) comprises a charging cable and a charger.

2. The portable power unit according to claim 1, characterized in that: The battery (101) is provided with a temperature alarm module. When the temperature of the battery (101) is higher than a set temperature threshold, the instrument panel alarms, the power of the radiator (105) is increased, and the power of other working systems is reduced.

3. The portable power unit according to claim 1, characterized in that: The electronically controlled variable pump of the hydraulic pump (102) controls the flow of the hydraulic circuit, and the gear pump of the hydraulic pump (102) converts the mechanical energy generated by the motor (103) into hydraulic energy, thereby realizing the control of the upper vehicle slewing and luffing action and the lower vehicle outrigger and suspension action.

4. The portable power unit according to claim 1, characterized in that: When the motor (103) is plugged in, it converts the electrical energy output by the external power supply into mechanical energy through the charging device (104), thereby driving the crane (2) to operate.

5. The portable power unit according to claim 1, characterized in that: When the charging device (104) is in a purely electric operating state, an external power source charges the battery (101) through the charging device (104).

6. The portable power unit according to claim 1, characterized in that: When the charging device (104) is in a plugged-in state, the external power source provides electric energy to the motor (103) or supplies power to the battery (101) through the charging device (104).

7. The portable power unit according to claim 1, characterized in that: The portable power unit (1) is installed on the frame of the crane (2) through a bracket, or is arranged around the crane (2); the portable power unit (1) is connected to the hydraulic system of the crane (2) through hydraulic pipelines and circuits, and the hydraulic socket of the portable power unit (1) used for connection of the crane (2) is a quick connector; the hydraulic pipeline of the portable power unit (1) and the hydraulic pipeline of the crane (2) are connected by a shuttle valve or an electrically controlled selection valve before entering the central rotating body.

8. The method for using the portable power unit according to claim 1, characterized in that: The crane (2) is connected to a portable power unit (1), and a working mode is selected according to whether the portable power unit (1) is connected to an external power source. If the portable power unit (1) is not connected to an external power source, a pure electric working state is entered, and the power source of the crane (2) is the electric energy stored in the battery (101). The motor (103) converts the electric energy into mechanical energy, and the hydraulic pump (102) converts the mechanical energy into hydraulic energy. The control of the upper vehicle slewing and luffing action and the lower vehicle outrigger and suspension action is realized through the upper and lower vehicle hydraulic systems of the crane (2); when the battery (101) is low on power, the crane (2) prompts that the power is low.

9. The method for using the portable power unit according to claim 8, characterized in that: If the portable power unit (1) is connected to an external power source, it enters the plug-in working state, and the power source of the crane (2) is the electric energy supplied by the external power source. The external power source transmits the electric energy to the motor (103) through the charging device (104). The motor (103) converts the electric energy into mechanical energy, and the hydraulic pump (102) converts the mechanical energy into hydraulic energy. The upper and lower vehicle hydraulic systems of the crane (2) are used to control the upper vehicle slewing and luffing movements and the lower vehicle outrigger and suspension movements.

10. A crane using the portable power unit according to any one of claims 1 to 9.

Images