A new intelligent tyre crane

Abstract

The application discloses a novel intelligent tire crane, which comprises independent driving devices arranged on the left and right sides of a crane frame and having the same structure, power transmission is simultaneously driven by a battery pack, two walking driving motors, a gearbox, a transmission shaft and two-stage reducers to drive front and rear wheels on each side, so that forward, backward and high and low speed driving modes are realized; hydraulic linkage telescopic supporting legs are uniformly arranged around the frame, and the hydraulic linkage telescopic supporting legs have the functions of walking and lifting under normal conditions and lifting mode for ensuring stability under heavy load; a range-extending generator set is installed at the rear of the frame, and the range-extending generator set is connected with a power battery pack, a hoisting motor and a hydraulic lifting device composed of the hoisting motor and a gear pump through a feeding circuit; a control unit controls the torque and rotating speed of the driving motor according to the comprehensive instructions of an accelerator pedal and a steering wheel, so that straight driving, steering and turning around functions are realized; the application is more beneficial to energy saving and environmental protection, and is stable, efficient and convenient to operate and use.

Description

Technical Field

[0001] This invention relates to an engineering lifting machinery, and more particularly to an intelligent drive system for mechanical vehicles. Background Technology

[0002] Existing lifting machinery includes: crawler cranes, which cannot travel on roads and require loading and transportation, resulting in high costs and inconvenience; compared to other lifting machinery, they are relatively large and cumbersome, with significant limitations; truck cranes cannot travel with loads, and due to the design of the truck chassis, their large body proportions (length to width) make them less maneuverable in confined or restricted lifting areas, hindering entry, exit, turning, and maneuvering; operators must travel between two cabs, and when lifting heavy objects, they cannot cross directly over the moving cab, limiting their circumference and operating range; furthermore, truck cranes have relatively weak off-road capabilities and high requirements for road conditions, especially when only... When lifting from directly behind, a larger load can be achieved, but when lifting from the side, efficiency must be reduced. The selection of the site location is greatly constrained by the site conditions, which has significant shortcomings. Although existing tire cranes can move with light loads, the factory setting of the vehicle body proportions, which focuses on square shape, often results in a "short and wide" wide-body effect. This makes it difficult for large-tonnage tire cranes to pass through narrow sections of the road. In addition, like truck cranes, they have the shortcoming of steering wheel design. Due to the constraint of minimum turning radius, they have difficulties turning and turning in narrow places, resulting in low efficiency and a smaller lifting capacity compared to crawler cranes and truck cranes.

[0003] Existing crawler cranes, truck cranes, and tire cranes all have design limitations. Therefore, there is a need for a new type of intelligent all-terrain crane that can solve the above problems, but no such technology has been reported in the present invention. Summary of the Invention

[0004] To address the aforementioned problems in the prior art, the present invention aims to provide a novel intelligent all-terrain tire crane that is more maneuverable, low-noise and efficient, has strong lifting capacity, is stable and reliable, has low requirements for road surface conditions, and is highly adaptable.

[0005] To achieve the above objectives, the method adopted by the present invention is as follows: A novel intelligent tire crane includes independent drive devices with identical structures on both sides of the crane frame. Power transmission is achieved by a battery pack driving the front and rear wheels on each side simultaneously via two-sided walking drive motors, gearboxes, drive shafts, and two-stage reducers, enabling forward, reverse, and high- and low-speed driving modes. Hydraulically linked telescopic outriggers are evenly distributed around the frame, providing both normal load movement and a lifting mode that ensures stability under heavy loads. A range extender generator set installed at the rear of the frame is connected via a power supply line to the power battery pack, crane motor, and hydraulic lifting device composed of a gear pump at the front of the frame. The control unit controls the torque and speed of the two-sided drive motors based on the combined commands of the accelerator pedal and steering wheel, enabling straight-line movement, steering, and U-turn functions.

[0006] Furthermore, the aforementioned driving device is not the existing transverse coaxial two-wheel drive mode. It eliminates the complex steering wheels and their steering system, as well as many easily damaged components such as torque converters and differentials. It adopts a longitudinal two-wheel parallel drive design. The gear selection command in the cab simultaneously controls the gear shifting of the gearboxes on both sides. This system is all-wheel drive, and each wheel is equipped with a bevel gear reducer (first-stage reduction) and a planetary gear reducer (second-stage reduction). The identical structural design on the left and right sides makes the load ratio close to 50%:50, which is beneficial to improving stability.

[0007] Furthermore, the hydraulically linked telescopic outriggers are configured as 4 groups of 8 outriggers, symmetrically distributed around the frame. Each group of operating valves can simultaneously control the telescopic extension and support of 2 outriggers. The operation is convenient, and the eight-way all-round support design makes the load more balanced and is more conducive to improving the anti-overturning performance.

[0008] Furthermore, the range extender generator set consists of a range extender (engine), a generator, a power supply line, and a control circuit. It can manually or automatically activate the charging and operation mode based on operator instructions or the battery's power reserve, thus adapting to operational requirements during special periods.

[0009] Furthermore, the capacity of the power battery pack, under the condition of a single charge and with the range extender turned off, can meet the requirements of driving on the road for more than 150km or continuous lifting operations for more than 4 hours, so as to achieve the goal of strict noise control and cost saving during special periods; adopting a design that integrates the crane motor, gear pump and hydraulic oil tank in the front of the frame, and correspondingly integrates the range extender generator set in the rear of the frame, so that the front and rear weight distribution of the whole machine is close to 50%:50, in order to improve the balance and stability during driving and lifting operations.

[0010] Furthermore, the control unit is connected to the accelerator pedal and the steering position sensor through signal lines and control circuits. Based on the simulated position signals of the accelerator pedal and the steering wheel, the control unit instructs its motor controller to change the current magnitude and frequency of the motor stator, thereby accurately distributing and controlling the torque and speed of the two-sided drive motors to achieve precise steering, straight driving, acceleration, deceleration and constant speed driving functions.

[0011] Furthermore, the on-the-spot U-turn control button is connected to the control unit and the left and right U-turn control paddles on the steering wheel. When the on-the-spot U-turn control button is pressed and the transmission is put into a low gear, the control unit puts the left and right travel drive motors into a set standby state. At this time, pressing and holding the left U-turn control paddle changes the phase of the left drive motor to reverse, while the right drive motor rotates forward, and the crane continues to turn left to achieve a U-turn. When the U-turn control paddle is released or the brake pedal is pressed, the crane immediately stops turning and waits for the next command; conversely, it turns right and makes a U-turn.

[0012] The advantages of this invention compared to existing technologies are as follows: it solves the problems of tracked cranes being unable to travel on roads and having time-consuming and expensive relocations; it has a turn-around control function that existing truck cranes and tire cranes do not have, making it more mobile, flexible, and adaptable; it is not a traditional direct-drive engine, and can be adapted to smaller engines of the same size, resulting in low noise and high efficiency; it eliminates the complex steering system and many easily damaged components such as torque converters and differentials, requiring no maintenance, reducing maintenance costs, and ensuring stable operation and easy promotion. Attached Figure Description

[0013] The invention will be further described below with reference to the accompanying drawings and embodiments.

[0014] Figure 1 This is a schematic diagram of the structure of the present invention.

[0015] In the diagram: 1. Left front wheel (drive wheel), 2. Planetary gear reducer (two-stage reduction), 3. Bevel gear reducer (one-stage reduction), 4. Left front drive shaft, 5. Telescopic outrigger, 6. Gear pump, 7. Telescopic hydraulic cylinder, 8. Crane motor, 9. Power battery pack, 10. Hydraulic oil tank, 11. Left travel drive motor, 12. Crane slewing bearing, 13. Slewing gear ring, 14. Right drive shaft universal joint, 15. Right travel drive motor, 16. Right outrigger linkage, 17. Right gearbox, 18. Control unit, 19. Range extender (engine), 20. Generator, 21. Right rear wheel (drive wheel), 22. Crane frame, 23. U-turn control button, 24. Steering position sensor, 25. Steering wheel, 26. Accelerator pedal position sensor, 27. Accelerator pedal (throttle), 28. Right U-turn control paddle shifter, 29. Left U-turn control paddle shifter. Detailed Implementation

[0016] Example 1 like Figure 1 The novel intelligent tire crane shown includes independent drive units with identical structures on both sides of the crane frame 22. Power transmission is achieved through a battery pack 9 via left and right travel drive motors 11 and 15, a gearbox (right side) 17, a drive shaft (left side) 4, and two-stage reducers (left side) 3 and 2, simultaneously driving the front and rear wheels on each side, including 1 and 21, to achieve forward, reverse, and high and low speed travel modes. Hydraulically linked telescopic outriggers 5 are evenly distributed around the frame 22, providing both normal load movement and a lifting mode that ensures stability under heavy loads. Range extender generator sets, including 19 and 20, are installed at the rear of the frame and connected to the power battery pack 9, the lifting motor 8, and the hydraulic lifting device composed of the gear pump 6 at the front of the frame via a power supply line. The control unit 18 controls the torque and speed of the travel drive motors 11 and 15 on both sides according to the combined commands of the accelerator pedal 27 and the steering wheel 25 to achieve straight-line travel, turning, and U-turn functions.

[0017] Example 2 The aforementioned driving device differs from the existing transverse coaxial two-wheel drive mode, eliminating the complex steering wheels and their steering system, as well as several easily damaged components such as torque converters and differentials. It adopts a longitudinal, parallel drive design with wheels on both sides. The gear selection command in the cab simultaneously controls the gear shifting of the gearboxes on both sides. This system is all-wheel drive, and each wheel is equipped with a bevel gear reducer 3 and a planetary gear reducer 2 (also called wheel-side reduction). This avoids the need for regular lubrication of the steering system and maintenance and replacement of tie rods, ball joints, bushings, etc., as required by traditional truck cranes and tire cranes, saving time and costs. The optimized design without steering wheels and differentials, especially on unpaved, muddy, and soft roads, effectively reduces sideslip and driving resistance, significantly improving off-road capability. At the same time, the identical structural design on both sides makes the load ratio approach 50%:50, improving stability.

[0018] The hydraulic telescopic outriggers 5 are connected to the telescopic hydraulic cylinders 7 via each outrigger connecting rod 16. There are 8 cylinders in 4 groups, which are symmetrically distributed around the frame. The design adopts a linkage design in which each group of operating valves can simultaneously control the telescopic extension and support of 2 outriggers, making operation convenient. The eight-way all-round support design can significantly improve the anti-overturning performance and realize 360-degree rotation hoisting operation without blind spots.

[0019] The range extender generator set consists of a range extender (engine) 19, a generator 20, control lines, and power supply lines. It can manually or automatically start the charging and driving mode according to the operator's instructions or the power reserve of the power battery pack 9 to adapt to the operation requirements during special periods.

[0020] The power battery pack 9 has a capacity that allows for road travel of over 150km and continuous hoisting operations of over 4 hours on a single charge with the range extender off. It can significantly reduce noise and is environmentally friendly and economical. The design integrates the hoisting motor 8, gear pump 6, and hydraulic oil tank 10 into the front (or rear) of the frame 22. The range extender generator set is also integrated into the rear (or front) of the frame 22, making the front and rear weight distribution of the whole machine close to 50%:50, which promotes a more balanced and stable driving and hoisting operation.

[0021] Example 3 The control unit 18 is connected to the accelerator pedal position sensor 26 and the steering position sensor 24 via signal lines and control loops. Based on the analog position signal commands from the accelerator pedal 27 and the steering wheel 25, the control unit instructs its motor controller to precisely distribute and control the torque and speed of the two-sided drive motors by changing the magnitude and frequency of the motor stator current. When driving straight, the controller makes the current, voltage, and frequency of the two-sided drive motors equal, resulting in equal torque and speed. During acceleration, the controller keeps the power battery pack in a high-current discharge state according to the depth of the accelerator pedal. During deceleration, the current output is reduced. During rapid deceleration or braking, there is zero current output, and the power battery pack is recharged, i.e., energy recovery. When turning left, the controller distributes unbalanced current, voltage, and frequency according to the position signal of the steering wheel, making the speed of the left drive motor relatively lower and the speed of the right drive motor relatively higher, so that the crane can turn left. The distribution ratio is determined by the controller based on the real-time position of the steering wheel. Here, only the distribution ratio is adjusted, while the total amount is determined by the controller based on the position depth of the accelerator pedal. When turning right, the opposite is true.

[0022] Example 4 The in-situ U-turn control button 23 is connected to the control unit 18 and the left U-turn control paddle 29 and right U-turn control paddle 28 on the steering wheel 25. When the in-situ U-turn control button is pressed and the gearbox is put into a low gear, the control unit puts the two drive motors in a set standby state. At this time, when the left U-turn control paddle is pressed, the control unit instructs its motor controller to control the frequency and phase of the two drive motors, so that the left drive motor reverses and the right drive motor rotates forward, and the crane continuously turns to the left and realizes intelligent in-situ U-turn. When the U-turn control paddle is released or the brake pedal is pressed, the crane immediately stops turning and waits for the next instruction. Conversely, it can turn to the right and make an in-situ U-turn. The present invention adopts an all-wheel drive and all-wheel reversible design structure, which has strong anti-skid passability and can significantly reduce the friction between the tires and the ground when turning and making U-turns, effectively reducing resistance and abnormal tire wear.

[0023] The beneficial effects of this invention are: it can significantly reduce noise, reduce emissions, and save costs; it has an intelligent U-turn function, making it more maneuverable and flexible; it has all-wheel drive and eliminates the differential device, making it able to cope with all road conditions and highly adaptable; it has no torque converter or complex steering system, requires no maintenance, is easy to operate and use, and is easy to promote.

[0024] Finally, it should be noted that the above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications and substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A novel intelligent tire crane, comprising independent drive units with identical structures on both sides of the crane frame, wherein power transmission is achieved by a battery pack via a travel drive motor, gearbox, drive shaft, and two-stage reducer, simultaneously driving the front and rear wheels on each side to achieve forward, reverse, and high- and low-speed travel modes; hydraulically linked telescopic outriggers evenly distributed around the frame, providing both normal load travel and a lifting mode that ensures stability under heavy loads; a range extender generator set installed at the rear of the frame is connected via a feed line to a power battery pack, a lifting motor, and a hydraulic lifting device composed of a gear pump at the front of the frame; and a control unit controls the torque and speed of the drive motor based on combined commands from the accelerator pedal and steering wheel to achieve straight-line travel, steering, and U-turn functions.

2. The novel intelligent tire crane according to claim 1, characterized in that: The aforementioned driving device differs from the existing transverse coaxial two-wheel drive mode. It eliminates complex steering wheels and their steering system, torque converter, differential and other easily damaged components, and adopts a longitudinal two-wheel parallel drive design. The gear selection command in the cab simultaneously controls the gear shifting of the gearboxes on both sides. This system is an all-wheel drive mode, and each drive wheel is equipped with a bevel gear reducer (first-stage reduction) and a planetary gear reducer (second-stage reduction). At the same time, the identical structural design on the left and right sides makes the load ratio close to 50%:

50.

3. The novel intelligent tire crane according to claim 1, characterized in that: The hydraulically linked telescopic outriggers are provided in 4 groups of 8, symmetrically distributed around the frame. Each group of operating valves can simultaneously control the extension and support of 2 outriggers.

4. The novel intelligent tire crane according to claim 1, characterized in that: The range extender generator set consists of a range extender (engine), generator, power supply line and control line, and can automatically start the charging and driving mode according to the operator's instructions or the battery pack's power reserve.

5. The novel intelligent tire crane according to claim 1, characterized in that: The power battery pack's set capacity, under the condition of a single charge and with the range extender turned off, can meet the requirements of road travel of more than 150km or continuous lifting operations of more than 4 hours, in order to achieve the goal of strict noise control and cost saving during special periods; adopting a design that integrates the crane motor, gear pump and hydraulic oil tank into the front (or rear) of the frame, corresponding to the range extender generator set integrated into the rear (or front) of the frame, so that the front and rear weight distribution of the whole machine is close to 50%:

50.

6. The novel intelligent tire crane according to claim 1, characterized in that: The control unit connects to the accelerator pedal position sensor and the steering position sensor through signal lines and control loops. Based on the simulated position signals of the accelerator pedal (throttle) and the steering wheel, the control unit instructs its motor controller to change the current magnitude and frequency of the drive motor stator, thereby accurately distributing and controlling the torque and speed of the two-sided travel drive motors, realizing the crane's steering, straight-line movement, acceleration, deceleration, and constant speed travel.

7. The novel intelligent tire crane according to claim 6, characterized in that: The U-turn control button is connected to the control unit and the left and right U-turn control paddles on the steering wheel. When the U-turn control button is pressed and the gearbox is in low gear, the control unit puts the left and right drive motors into a set standby state. At this time, if the left U-turn control paddle is pressed, the control unit changes the phase of the left drive motor to reverse, while the right drive motor rotates forward. The crane continuously turns left to achieve a U-turn. When the U-turn control paddle is released or the brake pedal is pressed, the crane immediately stops turning and waits for the next command; otherwise, it turns right and makes a U-turn.

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