Power system for hoisting equipment and hoisting equipment

Abstract

The invention discloses a power system for hoisting equipment and the hoisting equipment, the power system comprises a battery, an engine, a generator, a winch motor, a planet wheel assembly and a control system, the winch motor and the generator are powered by the battery, and the planet wheel assembly comprises a sun wheel, a planet wheel, a planet carrier and a gear ring; the planet wheel assembly is used for connecting the engine, the generator and the winch motor. The gear ring and the winch motor are used for driving the winding drum to rotate. The generator has a first state of outputting torque to start the engine and a second state of bearing input torque to generate electricity to charge the battery; the control system is used for obtaining the actual energy storage capacity of the battery and further used for controlling the generator to be switched to the first state when the actual energy storage capacity is smaller than the first standard energy storage capacity, so that the planet carrier drives the gear ring to rotate, energy loss is reduced, efficiency is high, oil consumption is low, and the low-energy-consumption use requirement of hoisting equipment is met.

Description

Technical Field

[0001] This invention relates to the field of engineering machinery technology, specifically to a power system and lifting equipment for lifting equipment. Background Technology

[0002] With global warming and energy shortages becoming increasingly prominent issues, construction machinery, as a key energy-consuming industry, is receiving increasing attention from relevant departments. Driven by policy and pressured by environmental regulations, construction machinery is developing towards energy conservation, environmental protection, and low-carbon practices.

[0003] Traditional construction machinery vehicles (such as crawler cranes) use hydraulic systems for hydraulic drive, which has low transmission efficiency, requires a large engine, and has high fuel consumption. In order to meet the development goals of energy conservation, environmental protection, and green low carbon, some manufacturers have developed a range-extended power system. This system combines an engine and a range extender motor, with the engine driving the range extender motor to generate electricity to power hydraulic actions such as winches. In this process, the engine does not directly participate in the winch. However, the energy conversion process of the above-mentioned range-extended power system is complex and has high losses, which cannot meet the low-energy consumption requirements of construction machinery vehicles such as crawler cranes. Summary of the Invention

[0004] This invention provides a power system and lifting equipment for lifting equipment, which solves the technical problem that existing range-extended power systems have many energy conversion links and high losses, and cannot meet the low-energy consumption requirements of engineering machinery vehicles such as crawler cranes.

[0005] In a first aspect, the present invention provides a power system for lifting equipment, comprising a battery, an engine, a generator, a hoisting motor, a planetary gear assembly, and a control system. The hoisting motor and the generator are powered by the battery. The planetary gear assembly includes a sun gear, planet gears, a planet carrier, and a ring gear. The planetary gear assembly is used to connect the engine, the generator, and the hoisting motor. The hoisting motor and the ring gear are used to drive a drum to rotate. The generator has a first state of outputting torque to start the engine and a second state of being able to withstand input torque to generate electricity to charge the battery. The control system is used to obtain the actual energy storage capacity of the battery and compare the actual energy storage capacity with a first standard energy storage capacity. The control system is also used for: When the actual energy storage capacity is less than the first standard energy storage capacity, the generator is controlled to switch to the first state, so that the planetary carrier drives the gear ring to rotate.

[0006] According to the present invention, a power system for lifting equipment has at least the following advantages: The engine, generator, and winch motor are connected via a planetary gear assembly. The gear ring is associated with the drive end of the winch motor and works together to drive the drum to lift or lower the load. The battery powers both the winch motor and the generator. When the battery has sufficient energy, it powers the winch motor, allowing the load to be lifted simply by starting the winch motor. When the battery's energy capacity decreases, it can power the winch motor, outputting torque, and simultaneously start the engine via the generator. This allows the engine to directly drive the gear ring, applying its torque directly to the drum. Together with the winch motor, the winch lifts the load, eliminating the intermediate energy conversion process where the engine drives the generator to charge the battery, which then powers the winch motor. This reduces energy loss, increases transmission efficiency, and lowers fuel consumption, meeting the low-energy requirements of lifting equipment.

[0007] In one optional embodiment, the sun gear has a rotatable first unlocked state and a fixed first locked state; the control system is further configured to acquire the actual rotational speed of the engine and compare the actual rotational speed with a first standard rotational speed; during the process of the planetary gears driving the ring gear to rotate, the control system is further configured to: When the actual rotational speed is greater than the first standard rotational speed, the sun gear is controlled to switch to the first locking state, and the generator is controlled to switch to the second state.

[0008] In one optional implementation, during the process of the planetary gears driving the ring gear to rotate, the control system is further configured to: When the engine has excess output energy, the sun gear is controlled to switch to the first unlocked state, and the planet carrier drives the sun gear to rotate, so that the generator generates electricity to charge the battery.

[0009] In one optional embodiment, the gear ring has a rotatable second unlocked state and a fixed second locked state; the control system is further configured to: When the actual energy storage capacity is less than the second standard energy storage capacity, the hoisting motor is stopped and the gear ring is switched to the second locking state. Then, the generator is controlled to switch to the first state. When the actual speed is greater than the first standard speed, the sun gear is controlled to switch to the first locking state, and the generator is controlled to switch to the second state. The second standard energy storage capacity is smaller than the first standard energy storage capacity.

[0010] In one optional embodiment, the system further includes a traveling mechanism electrically connected to the battery, the traveling mechanism being used to control the traveling, luffing, and slewing movements of the lifting equipment; the control system is further used for: When only walking, luffing, and slewing actions are required, the winch motor is stopped, and the battery is used to power the walking mechanism.

[0011] In one optional embodiment, the power system has a pure electric state where it is electrically connected to an external power source. When the power system is in the pure electric state, the control system is electrically connected to the external power source, and the control system is used to control the external power source to supply power to the generator, the hoist motor, and the traveling mechanism.

[0012] In one alternative embodiment, the traveling mechanism includes an oil pump motor electrically connected to the battery, the drum is provided with a brake, and the oil pump motor is used to control the oil circuit of the brake.

[0013] In one optional embodiment, the drive end of the engine is further connected to a main pump and a rotary pump. The main pump is used to control the traveling and luffing movements of the lifting equipment, and the rotary pump is used to control the slewing movement of the lifting equipment. The control system is further used for: When only walking, luffing, and slewing actions are required, the winch motor is stopped, and the generator is switched to the first state, so that the drive end of the engine applies output torque to the main pump and the rotary pump respectively.

[0014] In one optional embodiment, the system further includes an oil pump motor powered by the battery, the output shaft of which is connected to a control oil pump; the drum is equipped with a brake, and the control oil pump is used to control the oil circuit of the brake.

[0015] In one alternative implementation, the hoist motor has a third state of outputting torque and a fourth state of being able to withstand input torque to generate electricity to charge the battery, and the control system is further configured to: When the heavy object is lowered, the hoist motor is switched to the fourth state, and the drum reverses to drive the hoist motor to generate electricity to charge the battery.

[0016] In a second aspect, the present invention also provides a lifting device, including a winch, and further including the power system for the lifting device provided in the first aspect above.

[0017] Since lifting equipment includes a power system for lifting equipment, which has the same beneficial effects as the power system for lifting equipment, it will not be elaborated here. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the first embodiment of the present invention; Figure 2 This is another structural schematic diagram of the first embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the second embodiment of the present invention; Figure 4 This is a schematic diagram showing the rotational speed corresponding to the process of the battery having sufficient energy storage capacity and the hoisting of the heavy object by the hoisting motor in this embodiment of the invention. Figure 5 This is a schematic diagram of the rotational speed corresponding to the generator output torque starting the engine in an embodiment of the present invention; Figure 6 This is a schematic diagram of the rotational speed corresponding to the process of using the excess output energy of the engine to generate electricity in an embodiment of the present invention; Figure 7 This is a schematic diagram of the rotational speed corresponding to the process in which the lowering of the heavy object causes the drum to reverse and drag the winch motor to generate electricity in an embodiment of the present invention. Figure 8 This is a schematic diagram of the rotational speed corresponding to the process of the hoisting motor stopping and the engine driving the generator to generate electricity in an embodiment of the present invention. Figure 9 This is a schematic diagram of the rotational speed corresponding to the process in the first embodiment of the present invention where the hoisting motor stops and the engine applies output torque to the main pump and the rotary pump; Figure 10 This is a schematic diagram of the rotational speed corresponding to the auxiliary action and the hoisting action in the first embodiment of the present invention. Figure 11 This is a schematic diagram of the rotational speed corresponding to the process of lowering and lifting heavy objects in pure electric mode in the second embodiment of the present invention.

[0020] Explanation of reference numerals in the attached figures: 100-battery; 200-engine; 300-generator; 400- Hoist motor; 500 - Planetary gear assembly, 510 - Sun gear, 520 - Planetary gears, 530 - Planetary carrier, 540 - Ring gear 600 - Control system; 610 - All-in-one controller; 620 - First controller; 630 - Second controller; 640 - Third controller; 700 - Drum, 710 - Brake, 720 - Wire rope; 800 - Oil pump motor; 810 - Control oil pump; 910 - Main pump; 920 - Rotary pump; 1000 - External power supply; 1100-Pulley; 1200-boom. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In the description of this embodiment, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this embodiment and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this embodiment. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this embodiment, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment according to the specific circumstances.

[0024] The following is combined with Figures 1 to 11 The following describes embodiments of the present invention.

[0025] According to an embodiment of the present invention, a power system for lifting equipment is provided, including a battery 100, an engine 200, a generator 300, a winch motor 400, a planetary gear assembly 500, and a control system 600. The winch motor 400 and the generator 300 are powered by the battery 100. The planetary gear assembly 500 includes a sun gear 510, planet gears 520, a planet carrier 530, and a ring gear 540. The planet carrier 530 is connected to the drive end of the engine 200, the sun gear 510 is connected to the drive end of the generator 300, and the ring gear 540... Connected to the drive end of the winch motor 400, the winch motor 400 and the gear ring 540 drive the drum 700 to rotate. The outer side of the drum 700 is wound with wire rope 720 as needed to form a winch, enabling the lifting or lowering of heavy objects. The generator 300 has a first state where it outputs torque to start the engine 200, and a second state where it can withstand input torque to generate electricity to charge the battery 100. The control system 600 is used to obtain the actual energy storage capacity of the battery 100 and compare the actual energy storage capacity with a first standard energy storage capacity. The control system 600 is also used for: When the actual energy storage capacity is less than the first standard energy storage capacity, the generator 300 is switched to the first state, causing the planetary carrier 530 to drive the gear ring 540 to rotate.

[0026] In this embodiment, the power system connects a planetary carrier 530 to the drive end of the engine 200, and the gear ring 540 is associated with the drive end of the hoisting motor 400, thus cooperating to drive the drum 700 to rotate and hoist the load, thereby lifting or lowering the load. The battery 100 supplies power to the hoisting motor 400 and the generator 300. Figure 4 As shown, when the energy storage capacity of battery 100 is sufficient, the control battery 100 supplies power to the hoisting motor 400, so that only the hoisting motor 400 needs to be started to hoist and lift the heavy object; as Figure 5 As shown, when the energy storage capacity of battery 100 decreases and becomes insufficient, battery 100 can both supply power to winch motor 400, enabling winch motor 400 to output torque, and generator 300 can start engine 200, causing engine 200 to directly drive gear ring 540 to rotate. The torque output by engine 200 is directly applied to drum 700, working together with winch motor 400 to winch and lift the heavy object. This eliminates the intermediate energy conversion process where engine 200 drives generator 300 to generate electricity to charge battery 100, and then battery 100 supplies power to winch motor 400, reducing energy loss, increasing transmission efficiency, and reducing fuel consumption, thus meeting the low-energy consumption requirements of lifting equipment.

[0027] It is understandable that the first standard energy storage capacity mentioned in the article refers to the energy storage capacity of battery 100 when the hoist motor 400 powered solely by battery 100 is unable to lift the heavy object.

[0028] In specific applications, the lifting equipment can be one of the following: crawler crane, dynamic compaction machine, etc.

[0029] In some embodiments, the sun gear 510 has a rotatable first unlocked state and a fixed first locked state; the control system 600 is also configured to acquire the actual rotational speed of the engine 200 and compare the actual rotational speed with a first standard rotational speed; during the process of the planet gear 520 driving the ring gear 540 to rotate, the control system 600 is also configured to: When the actual speed is greater than the first standard speed, the sun gear 510 is controlled to switch to the first locking state, and the generator 300 is controlled to switch to the second state.

[0030] This embodiment achieves reduced power consumption by ensuring that the generator 300 outputs torque to start the engine 200 to normal operating speed, and then disconnecting the generator 300 from the engine 200.

[0031] It is understandable that the standard speed mentioned in the article refers to the operating speed corresponding to the engine after it has entered normal operating condition.

[0032] like Figure 6 As shown, in some embodiments, during the rotation of the ring gear 540 driven by the planetary gear 520, the control system 600 is also used to: When the engine 200 has excess output energy, the control sun gear 510 switches to the first unlocked state, and the planet carrier 530 drives the sun gear 510 to rotate, so that the generator 300 generates electricity to charge the battery 100.

[0033] In this embodiment, when the engine 200 directly applies output torque to the drum 700 and works together with the hoisting motor 400 to hoist and lift the heavy object, the excess mechanical energy generated by the engine 200 can be used by the generator 300 to generate electricity to charge the battery 100, reducing energy waste and facilitating the full storage and use of energy.

[0034] In practical applications, the actual speed can be compared with the second standard speed as a standard to determine whether the engine 200 has excess output energy. That is, when the actual speed is greater than the second standard speed, it is determined that the engine 200 has excess output energy; when the actual speed is less than the second standard speed, it is determined that the engine 200 does not have excess output energy; the second standard speed is greater than the first standard speed.

[0035] It is understandable that the second standard speed mentioned in the article refers to the engine speed of 200 rpm when the torque output of the engine at 200 rpm is sufficient to independently lift and hoist a heavy object.

[0036] In another alternative implementation, the control system 600 is used to acquire the actual output torque of the engine 200 and compare the actual output torque with the standard output torque as a standard for judging whether the engine 200 has excess output energy; when the actual output torque is greater than the standard output torque, it is determined that the engine 200 has excess output energy; when the actual output torque is less than the standard output torque, it is determined that the engine 200 does not have excess output energy.

[0037] It is understandable that the standard output torque mentioned in the article refers to the output torque of engine 200 when it is capable of independently lifting heavy objects.

[0038] like Figure 8 As shown, in some embodiments, the gear ring 540 has a rotatable second unlocked state and a fixed second locked state; the control system 600 is also used for: When the actual energy storage capacity is less than the second standard energy storage capacity, the winch motor 400 is stopped and the gear ring 540 is switched to the second locking state. Then, control the generator 300 to switch to the first state. When the actual speed is greater than the first standard speed, control the sun gear 510 to switch to the first locking state and control the generator 300 to switch to the second state; the second standard energy storage capacity is less than the first standard energy storage capacity.

[0039] This embodiment ensures the continuity of the power system by controlling the speed of the hoist motor 400 to zero and controlling the engine 200 to drive the generator 300 only to generate electricity to charge the battery 100 when the energy storage capacity of the battery 100 drops to the point where it can no longer provide energy for the normal operation of the hoist motor 400.

[0040] It is understandable that the second standard energy storage capacity mentioned in the text refers to the energy storage capacity of battery 100 under the condition that the energy provided by battery 100 cannot drive the normal output torque of hoist motor 400, but can start generator 300 normally.

[0041] like Figure 3 and Figure 9 As shown, in some embodiments, the power system further includes a traveling mechanism electrically connected to the battery 100, which is used to control the traveling, luffing, and slewing movements of the lifting equipment; the control system 600 is also used for: When only walking, luffing, and slewing actions are required, the winch motor 400 is stopped, and the battery 100 is used to power the walking mechanism.

[0042] This embodiment uses battery 100 to power the traveling mechanism, enabling the lifting equipment to perform auxiliary actions such as traveling, luffing, and slewing, as well as to perform hoisting actions, based on the requirement of only power supply.

[0043] Specifically, the traveling mechanism includes an oil pump motor 800, which is electrically connected to a battery 100. The output shaft of the oil pump motor 800 is connected to a main pump 910 and a rotary pump 920. The main pump 910 is used for the traveling and luffing movements of the lifting equipment, and the rotary pump 920 is used to control the slewing movement of the lifting equipment. The control system 600 is also used for: When only walking, luffing, and slewing actions are required, the winch motor 400 is stopped, the battery 100 is used to supply power to the oil pump motor 800, and the output shaft of the oil pump motor 800 is started to apply output torque to the main pump 910 and the rotary pump 920 respectively.

[0044] This embodiment uses an oil pump motor 800 powered by battery 100 to drive the main pump 910 and the rotary pump 920, which can enable the lifting equipment to perform auxiliary actions such as walking, luffing and slewing, as well as to perform hoisting actions, based on the requirement of only power supply.

[0045] like Figure 3 As shown, specifically, the power system has a pure electric state where it is electrically connected to an external power source 1000. When the power system is in a pure electric state, the control system 600 is electrically connected to the external power source 1000. The control system 600 is used to control the external power source 1000 to supply power to the generator 300, the hoist motor 400, and the oil pump motor 800. With this setting, in the pure electric state where it can be electrically connected to the external power source 1000, it is possible to operate without starting the engine 200, thus achieving pure electric operation. This allows the hoisting equipment to be driven to perform hoisting actions simply by starting the hoist motor 400, and the hoisting equipment to perform auxiliary actions such as traveling, luffing, and slewing simply by starting the oil pump motor 800. This ensures that in an environment where it can be electrically connected to the external power source 1000, the basic functions of the hoisting equipment can be achieved without starting the engine 200.

[0046] like Figure 3 As shown, specifically, the drum 700 is equipped with a brake 710, and the oil pump motor 800 is used to control the oil circuit of the brake 710. With this configuration, the oil pump motor 800, which is powered by the battery 100 or the external power supply 1000, actively controls the opening and closing of the brake 710. In this embodiment, when the power system is in pure electric mode, the winch operation is decoupled from the engine 200.

[0047] In specific applications, the control system 600 includes a multi-function controller 610 and a first controller 620, a second controller 630, and a third controller 640 electrically connected to the multi-function controller 610. The multi-function controller 610 is electrically connected to the battery 100 and / or an external power supply 1000. The first controller 620 is electrically connected to the generator 300, the second controller 630 is electrically connected to the hoist motor 400, and the third controller 640 is electrically connected to the oil pump motor 800. This allows each motor powered by the battery 100 to be controlled by a corresponding controller, which helps improve control accuracy.

[0048] like Figure 1 and Figure 2 As shown, in some embodiments, the drive end of the engine 200 is also connected to a main pump 910 and a rotary pump 920. The main pump 910 is used to control the traveling and luffing movements of the lifting equipment, and the rotary pump 920 is used to control the slewing movement of the lifting equipment. The control system 600 is also used for: When only walking, luffing, and slewing actions are required, the winch motor 400 is stopped, and the generator 300 is switched to the first state, so that the drive end of the engine 200 applies output torque to the main pump 910 and the rotary pump 920 respectively.

[0049] In this embodiment, the main pump 910 and the rotary pump 920 are driven by the engine 200, which enables the lifting equipment to perform auxiliary actions such as walking, luffing and slewing even when the energy storage capacity of the battery 100 is severely insufficient. The lifting equipment equipped with the power system of this embodiment can adapt to more complex operating environments.

[0050] In specific applications, such as Figure 10 As shown, when the lifting equipment needs to perform auxiliary actions such as traveling, luffing, and slewing, and also needs to perform hoisting actions, the control system 600 is also used for: Control the sun gear 510 to switch to the first locking state, so that the speed of the generator 300 is zero; The engine 200 outputs energy to drive the main pump 910 and the rotary pump 920; Control the output energy of the hoist motor 400 to supply energy to the drum 700.

[0051] like Figure 1 and Figure 2As shown, specifically, this embodiment also includes an oil pump motor 800, which is powered by the battery 100. The output shaft of the oil pump motor 800 is connected to a control oil pump 810. The drum 700 is equipped with a brake 710, and the control oil pump 810 is used to control the oil circuit of the brake 710. With this configuration, the oil pump motor 800, powered by the battery 100 or an external power source 1000, actively controls the brake 710 to open / close. When the energy storage capacity of the battery 100 is sufficient to allow winching only by starting the winch motor 400, the winching action is decoupled from the engine 200.

[0052] like Figure 1 and Figure 2 As shown, in a specific application, the control system 600 includes a multi-function controller 610 and a first controller 620, a second controller 630, and a third controller 640 electrically connected to the multi-function controller 610. The multi-function controller 610 is electrically connected to the battery 100 and / or an external power supply 1000. The first controller 620 is electrically connected to the generator 300, the second controller 630 is electrically connected to the hoist motor 400, and the third controller 640 is electrically connected to the oil pump motor 800. This allows each motor powered by the battery 100 to be controlled by a corresponding controller, which helps improve control accuracy.

[0053] like Figure 7 As shown, in some embodiments, the hoist motor 400 has a third state of output torque and a fourth state of being able to withstand input torque to generate electricity to charge the battery 100. The control system 600 is also used for: When the heavy object is lowered, the control hoist motor 400 switches to the fourth state, and the drum 700 reverses to drive the hoist motor 400 to generate electricity to charge the battery 100.

[0054] In this embodiment, when the heavy object is lowered, the drum 700 is dragged in the opposite direction by the gravity of the heavy object to generate electricity, which is fed back to the battery 100 to charge it. This allows the energy generated by the drum 700 during the process of lowering the heavy object to be stored and reused, which helps to reduce fuel consumption.

[0055] In specific applications, such as Figure 11 As shown, when the energy storage capacity of battery 100 decreases and becomes insufficient, and in this embodiment, the external power supply 1000 is in a charging state, the control system 600 is used to: During the lifting of the heavy object, the winch motor 400 is switched to the third state, so that only the winch motor 400 needs to work during the entire lifting process, and the speed of the engine 200 is zero. During the lowering of the heavy object, the hoist motor 400 is switched to the fourth state to store the energy in the battery 100 for reuse.

[0056] According to a second aspect of the present invention, a lifting device is also provided, including a winch and a power system for the lifting device provided in the first aspect of the present invention. The power system of the lifting device in this embodiment connects a planetary carrier 530 to the drive end of an engine 200, and a gear ring 540 is associated with the drive end of a winch motor 400, cooperating to drive the drum 700 to rotate for winch operation, thereby lifting or lowering heavy objects. A battery 100 supplies power to the winch motor 400 and the generator 300. When the energy storage capacity of the battery 100 is sufficient, the battery 100 supplies power to the winch motor 400, so that only the winch motor 400 needs to be started to lift the heavy object. When the energy storage capacity of the battery 100 decreases, the battery 100 can still supply power to the winch motor 400. The hoisting motor 400 outputs torque, and the generator 300 starts the engine 200, which in turn drives the gear ring 540 to rotate. The torque output by the engine 200 is directly applied to the drum 700, working together with the hoisting motor 400 to hoist and lift the heavy object. This eliminates the intermediate energy conversion process where the engine 200 drives the generator 300 to generate electricity to charge the battery 100, and then the battery 100 supplies power to the hoisting motor 400. This reduces energy loss, increases transmission efficiency, and reduces fuel consumption, which is beneficial for promoting the development of the lifting equipment in this embodiment towards energy conservation, environmental protection, and low carbon emissions.

[0057] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the present invention.

Claims

1. A power system for lifting equipment, characterized in that, The system includes a battery (100), an engine (200), a generator (300), a hoisting motor (400), a planetary gear assembly (500), and a control system (600). The hoisting motor (400) and the generator (300) are powered by the battery (100). The planetary gear assembly (500) includes a sun gear (510), planet gears (520), a planet carrier (530), and a ring gear (540). The planetary gear assembly (500) is used to connect the engine (200), the generator (300), and the hoisting motor (400). The hoisting motor (400) and the ring gear (540) are used to drive the drum (700) to rotate. The generator (300) has a first state of outputting torque to start the engine (200) and a second state of being able to withstand input torque to generate electricity to charge the battery (100); the control system (600) is used to obtain the actual energy storage capacity of the battery (100) and compare the actual energy storage capacity with a first standard energy storage capacity; The control system (600) is also used for: When the actual energy storage capacity is less than the first standard energy storage capacity, the generator (300) is controlled to switch to the first state, so that the planetary carrier (530) drives the gear ring (540) to rotate.

2. The power system for lifting equipment according to claim 1, characterized in that, The sun gear (510) has a rotatable first unlocked state and a fixed first locked state; the control system (600) is also used to obtain the actual rotational speed of the engine (200) and compare the actual rotational speed with a first standard rotational speed; during the process of the planetary gear (520) driving the ring gear (540) to rotate, the control system (600) is also used to: When the actual rotational speed is greater than the first standard rotational speed, the sun gear (510) is controlled to switch to the first locking state, and the generator (300) is controlled to switch to the second state.

3. The power system for lifting equipment according to claim 2, characterized in that, During the process of the planetary gear (520) driving the gear ring (540) to rotate, the control system (600) is also used for: When the engine (200) has excess output energy, the sun gear (510) is controlled to switch to the first unlocked state, and the planet carrier (530) drives the sun gear (510) to rotate, so that the generator (300) generates electricity to charge the battery (100).

4. The power system for lifting equipment according to claim 2, characterized in that, The gear ring (540) has a rotatable second unlocked state and a fixed second locked state; the control system (600) is further configured to: When the actual energy storage capacity is less than the second standard energy storage capacity, the hoisting motor (400) is stopped and the gear ring (540) is switched to the second locking state. Then, the generator (300) is controlled to switch to the first state. When the actual speed is greater than the first standard speed, the sun gear (510) is controlled to switch to the first locking state, and the generator (300) is controlled to switch to the second state. The second standard energy storage capacity is smaller than the first standard energy storage capacity.

5. The power system for lifting equipment according to any one of claims 1 to 4, characterized in that, It also includes a traveling mechanism electrically connected to the battery (100), the traveling mechanism being used to control the traveling, luffing, and slewing movements of the lifting equipment; the control system (600) is further used for: When only walking, luffing, and slewing actions are required, the hoist motor (400) is stopped, and the battery (100) is used to power the walking mechanism.

6. The power system for lifting equipment according to claim 5, characterized in that, The power system has a pure electric state that is electrically connected to an external power source (1000). When the power system is in a pure electric state, the control system (600) is electrically connected to the external power source (1000). The control system (600) is used to control the external power source (1000) to supply power to the generator (300), the hoisting motor (400), and the traveling mechanism. And / or, the walking mechanism includes an oil pump motor (800) electrically connected to the battery (100), the drum (700) is provided with a brake (710), and the oil pump motor (800) is used to control the oil circuit of the brake (710).

7. The power system for lifting equipment according to any one of claims 1 to 4, characterized in that, The drive end of the engine (200) is also connected to a main pump (910) and a rotary pump (920). The main pump (910) is used to control the traveling and luffing movements of the lifting equipment, and the rotary pump (920) is used to control the slewing movement of the lifting equipment. The control system (600) is also used for: When only walking, luffing and slewing actions are required, the hoist motor (400) is stopped and the generator (300) is switched to the first state, so that the drive end of the engine (200) applies output torque to the main pump (910) and the rotary pump (920) respectively.

8. The power system for lifting equipment according to claim 7, characterized in that, It also includes an oil pump motor (800), which is powered by the battery (100), and the output shaft of the oil pump motor (800) is connected to a control oil pump (810); the drum (700) is provided with a brake (710), and the control oil pump (810) is used to control the oil circuit of the brake (710).

9. The power system for lifting equipment according to claim 1, characterized in that, The hoist motor (400) has a third state of output torque and a fourth state of being able to withstand input torque to generate electricity to charge the battery (100). The control system (600) is also used for: When the heavy object is lowered, the hoist motor (400) is controlled to switch to the fourth state, and the drum (700) drives the hoist motor (400) in the opposite direction to generate electricity to charge the battery (100).

10. A lifting device, comprising a winch, characterized in that, It also includes a power system for lifting equipment as described in any one of claims 1 to 9.

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