Electric winch crane

Abstract

The utility model discloses an electric winch crane which comprises a power supply system, a first winch, a first winch motor controller, a first winch motor, a second winch, a second winch motor controller and a second winch motor, the power supply system comprises a range extender and an energy storage device; the range extender is composed of an engine, a first clutch and a main pump motor, and the power output end of the engine is connected with the power input end of the main pump motor through the first clutch. The main pump motor is electrically connected with the main pump motor controller, and the main pump motor controller is electrically connected with the energy storage device, the first winch motor controller and the second winch controller. The power output end of the main pump motor is in power connection with the main hydraulic pump through a second clutch. Multi-winch operation is adopted, the motor directly drives winches, and compared with hydraulic and mechanical transmission, the transmission efficiency is higher. The engine does not directly drive an operation part, an energy storage device is used as a supplement, and the model selection of the engine is smaller.

Description

TECHNICAL FIELD

[0001] The utility model relates to engineering machinery technical field, concretely relates to a kind of electric hoist crane. BACKGROUND

[0002] With the increase of the tonnage of hoisting load, single hoist operation cannot meet the demand, and double hoist or even multi-hoist operation hoisting machinery appears in the market. The multi-hoist crane on the market is driven by hydraulic pressure, and the transmission efficiency is low. A large engine is needed to match, the engine working area is not economical, and the fuel consumption is high. At the same time, energy cannot be recovered when the hoist is lowered, and the energy is dissipated in the form of heat, increasing the thermal load of the hydraulic system and reducing the service life of the hydraulic components. In addition, due to the long transmission route of the hoist speed control of the hydraulic drive, the control lag is obvious. With the increase of hydraulic component wear and internal leakage, the control response and accuracy will be greatly affected, and it is difficult to realize the construction synchronization of multi-hoist in the whole life cycle. SUMMARY

[0003] The technical problem to be solved by the utility model is to provide a crane with strong hoisting capacity, high transmission efficiency, low fuel consumption, good operation synchronization and good reliability. To solve the above problems, an electric hoist crane is provided.

[0004] The purpose of the utility model is achieved in the following way:

[0005] An electric hoist crane, comprising a power supply system, a first hoist, a first hoist motor controller, a first hoist motor, a second hoist, a second hoist motor controller and a second hoist motor. The first hoist motor controller is connected to the first hoist motor, and the first hoist motor is connected to the first hoist through a reducer. The second hoist motor controller is connected to the second hoist motor, and the second hoist motor is connected to the second hoist through a reducer. The power supply system comprises a range extender and an energy storage device. The range extender is composed of an engine, a first clutch and a main pump motor. The power output end of the engine is connected to the power input end of the main pump motor through the first clutch. The main pump motor is electrically connected to a main pump motor controller. The main pump motor controller is electrically connected to the energy storage device, the first hoist motor controller and the second hoist controller respectively. The power output end of the main pump motor is connected to the main hydraulic pump through a second clutch.

[0006] The energy storage device comprises a capacitor or a battery, which provides power for the whole machine when the range extender is not involved or in pure electric operation mode.

[0007] The first winch controller and the second winch controller convert the direct current generated by the energy storage device and the range extender system into three-phase alternating current to drive the winch motor to work, and convert the three-phase alternating current generated by the winch motor into direct current when the winch is lowered.

[0008] The electric winch crane comprises a pure electric driving mode and a hybrid mode, in the pure electric driving mode, the first clutch is disconnected, the engine is stopped, and the second clutch is connected; in the hybrid mode, according to the hydraulic demand, two kinds are divided: the first kind: when the hydraulic demand is small, the first clutch is connected, the main pump motor generates power, the second clutch is disconnected, the main hydraulic pump does not work, and the hydraulic power is provided by the small pilot pump of the engine; the second kind: when the hydraulic demand is large, the first clutch is separated, the main pump motor is first stopped, the second clutch is connected, the main pump motor is speed-regulated to be consistent with the rotating speed of the engine, then the first clutch is connected, and the engine and the main pump motor are coupled.

[0009] The electric winch crane comprises a pure electric driving mode and a hybrid mode, in the pure electric driving mode, the first clutch is disconnected, the engine is stopped, and the second clutch is connected; in the hybrid mode, according to the hydraulic demand, two kinds are divided: the first kind: when the hydraulic demand is small, the first clutch is connected, the main pump motor generates power, the second clutch is disconnected, the main hydraulic pump does not work, and the hydraulic power is provided by the small pilot pump of the engine; the second kind: when the hydraulic demand is large, the first clutch is separated, the main pump motor is first stopped, the second clutch is connected, the main pump motor is speed-regulated to be consistent with the rotating speed of the engine, then the first clutch is connected, and the engine and the main pump motor are coupled. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of the utility model.

[0011] Among them, 1 is the first clutch, 2 is the second clutch, 3 is the first winch, and 4 is the second winch. DETAILED DESCRIPTION

[0012] The utility model will be further explained in detail in combination with the drawings and specific embodiments.

[0013] It should be pointed out that the following detailed description is exemplary, and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used in this paper have the same technical meaning as that generally understood by ordinary skilled persons in the technical field to which the present application belongs.

[0014] As Figure 1As shown, the utility model provides a kind of electric hoist crane, including power supply system, first hoist 3, first hoist motor controller, first hoist motor, second hoist 4, second hoist motor controller, second hoist motor;The first hoist motor controller is connected with first hoist motor, and the first hoist motor is connected with first hoist by reducer;Second hoist motor controller is connected with second hoist motor, and the second hoist motor is connected with second hoist by reducer;The power supply system includes range extender and energy storage device;The range extender is composed of engine, first clutch and main pump motor, and the power output end of the engine is connected with the power input end of main pump motor by first clutch 1;The main pump motor is electrically connected with main pump motor controller, and the main pump motor controller is electrically connected with energy storage device, first hoist motor controller and second hoist controller respectively;The power output end of the main pump motor is connected with main hydraulic pump by second clutch 2.

[0015] The main pump motor can drive the main hydraulic pump as the power source of the main hydraulic pump of the driving hydraulic system, and the load of the engine can be stored into the energy storage device. The main hydraulic pump is used to provide hydraulic power for components requiring hydraulic drive.

[0016] Specifically: energy supply system: engine, first clutch, main pump motor (driving, power generation integrated) range extender, main pump motor matching separate controller, main pump motor controller converts three-phase alternating current generated by main pump motor into direct current, range extender generates power in time, and energy storage device (capacitor, battery, etc.) constitutes power supply system. Energy storage device (capacitor, battery, etc.) serves as energy caching unit, provides electrical energy for the whole machine when range extender does not intervene or in pure electric mode, and recovers energy in hoist braking condition. When energy storage device cannot provide energy required for operation, range extender generates power, which is directly supplied to first hoist motor and second hoist motor through main pump motor controller, first hoist motor controller and second hoist motor controller respectively, and simultaneously supplies power to energy storage device through main pump motor controller, and range extender stops generating power when energy storage device has high power.

[0017] The first clutch 1 is added between the engine and the main pump motor, and the second clutch is added between the main pump motor and the main hydraulic pump, so that the whole machine has pure electric driving mode and hybrid mode.

[0018] Main working device:

[0019] Main working device includes first hoist 3, second hoist 4, and first hoist and second hoist are directly driven by motor respectively, and each motor matches separate controller. When hoist is lifted, hoist motor controller converts direct current generated by energy storage device and range extender system into three-phase alternating current to drive hoist motor to work, and when hoist is lowered, three-phase alternating current generated by two hoist motors is converted into direct current and stored in energy storage device.

[0020] auxiliary operation device:

[0021] pure electric mode:

[0022] The first clutch is disconnected, the engine is stopped, the second clutch is connected, the main pump motor adjusts the rotation speed of the main hydraulic pump according to the hydraulic demand, is not limited by the minimum rotation speed of the engine, can reduce hydraulic overflow, and is helpful to energy saving.

[0023] hybrid mode:

[0024] The first clutch is connected, the main pump motor generates electricity, the second clutch is disconnected when the hydraulic demand is small, the main hydraulic pump does not work, and a small pilot pump provided with the engine provides hydraulic power, the pilot pump is directly connected with the power take-off port of the engine, power is provided for components with small hydraulic demand such as a winch clutch and a brake, and energy loss caused by long-time idling of the main hydraulic pump is avoided.

[0025] When the hydraulic demand is large (walking, rotating, amplitude changing and the like), the second clutch cannot be directly dynamically connected due to the fact that the main hydraulic pump does not allow the second clutch to be directly dynamically connected, and the main hydraulic pump does not have speed regulation capability, and dynamic connection can be realized by means of main pump motor speed regulation: the first clutch is separated, the main pump motor is first stopped, the second clutch is connected, then the main pump motor is regulated to the same speed as the engine, the first clutch is connected, and the engine and the main pump motor are coupled. Through the dynamic switching strategy of the clutch, the instantaneous impact on the transmission system can be reduced, and the service life is prolonged.

[0026] The utility model adopts multiple winch operation, and the lifting capacity is stronger;

[0027] The utility model adopts motor direct drive winch, compared with hydraulic and mechanical transmission, transmission efficiency is higher, and simultaneously, the advantage that electric drive system is quick in response and high in precision is convenient to play, accurate closed loop control is realized through electric winch steel wire rope tension, rotation speed and position feedback, and construction synchronism of multiple winch is realized.

[0028] The engine in the utility model does not directly drive operation components, has an energy storage device as supplement, the engine is smaller in selection, can generate power at the most economic region, and the energy generated by winch lowering can be recycled into the energy storage device, and energy consumption is lower.

[0029] In the pure electric mode, the first clutch 1 is disconnected, the main pump motor adjusts the rotation speed of the hydraulic pump according to the hydraulic demand, is not limited by the minimum rotation speed of the engine, can reduce hydraulic overflow, and is helpful to energy saving.

[0030] The utility model discloses a quick and smooth switching of hydraulic power is realized through the cooperation of two clutches.

[0031] The above-mentioned is only the preferred implementation mode of the utility model, and it should be pointed out that for the person skilled in the art, without departing from the overall concept of the utility model, a number of changes and improvements can be made, and these should also be considered as the protection scope of the utility model.

Claims

1. An electric hoist crane, characterized by: The electric hoist crane comprises a power supply system, a first hoist, a first hoist motor controller, a first hoist motor, a second hoist, a second hoist motor controller and a second hoist motor; the first hoist motor controller is connected with the first hoist motor, the first hoist motor is connected with the first hoist through a speed reducer, the second hoist motor controller is connected with the second hoist motor, the second hoist motor is connected with the second hoist through a speed reducer, the power supply system comprises a range extender and an energy storage device, the range extender comprises an engine, a first clutch and a main pump motor, a power output end of the engine is connected with a power input end of the main pump motor through the first clutch, the main pump motor is electrically connected with a main pump motor controller, the main pump motor controller is electrically connected with the energy storage device, the first hoist motor controller and a second hoist controller respectively, and a power output end of the main pump motor is connected with a main hydraulic pump through a second clutch.

2. The electric hoist crane of claim 1, wherein: The energy storage device comprises a capacitor or a battery, and the energy storage device provides electric energy for the whole machine when the range extender is not involved or in a pure electric operation mode.

3. The electric hoist crane of claim 1, wherein: When the hoist is lifted, the first hoist controller and the second hoist controller convert direct current generated by the energy storage device and the range extender system into three-phase alternating current to drive the hoist motor to work, and when the hoist is lowered, three-phase alternating current generated by the hoist motor is converted into direct current and stored in the energy storage device.

4. The electric hoist crane of claim 1, wherein: The electric hoist crane comprises a pure electric driving mode and a hybrid mode, in the pure electric driving mode, the first clutch is disconnected, the engine is stopped, and the second clutch is connected; in the hybrid mode, according to the hydraulic demand, two kinds of modes are divided: in the first mode, when the hydraulic demand is small, the first clutch is connected, the main pump motor generates power, the second clutch is disconnected, the main hydraulic pump does not work, and a small pilot pump provided by the engine provides hydraulic power; in the second mode, when the hydraulic demand is large, the first clutch is separated, the main pump motor is first stopped, the second clutch is connected, the main pump motor is adjusted to the same speed as the engine, then the first clutch is connected, and the engine and the main pump motor are coupled.

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