Aerial work platform

Abstract

The present application relates to the field of engineering machinery, and discloses an aerial work platform, comprising: a first hydraulic system, which comprises a rotary table effector mechanism arranged on a rotary table, a boom frame effector mechanism arranged on a boom frame, and a first control valve and a first electric pump set that are both arranged on the rotary table, the rotary table effector mechanism and the boom frame effector mechanism both being controlled by the first control valve, and the first electric pump set supplying oil to the first control valve; a second hydraulic system, which comprises a platform effector mechanism arranged on a work platform, a fly jib effector mechanism arranged on a fly jib, and a second control valve and a second electric pump set that are both arranged on the work platform, the platform effector mechanism and the fly jib effector mechanism both being controlled by the second control valve, and the second electric pump set supplying oil to the second control valve; a power supply module; and a control module. The present application is used for solving the problem of long oil supply pipes of a centralized hydraulic system, and achieves the effects of reducing the energy consumption of a system and improving the response capability of an end effector mechanism.

Description

aerial work platforms

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of Chinese patent application No. 202410095265.8 filed on January 23, 2024, the contents of which are incorporated herein by reference. Technical Field

[0003] The present application belongs to the field of engineering machinery, and specifically relates to an aerial work platform. Background Art

[0004] An aerial work platform (AWP) is a type of construction machinery used for mobile aerial work, equipment installation, and maintenance in various industries. As shown in Figure 1, an AWP generally comprises a turntable 61, a boom 62, a work platform 63, a fly arm 64, and a chassis 65. Chassis 65 is mobile. Turntable 61 is mounted on and rotatable relative to chassis 65. The bottom end of boom 62 is mounted on turntable 61, while the top end of boom 62 is mounted, in sequence, with a fly arm 64 and work platform 63. Boom 62 and fly arm 64 enable the work platform 63 to move through the air.

[0005] Existing aerial work platforms typically utilize a centralized hydraulic transmission system. Specifically, the hydraulic power source is provided by a hydraulic pump assembly located on the chassis 65. Hydraulic oil is then supplied to multiple control valves via supply lines. These control valves then distribute and control the total flow rate according to the needs of the actuators at each location. For aerial work platforms with long booms 62, the actuators at the end of the booms 62 are far from the hydraulic power source, resulting in long hydraulic transmission lines. This can lead to significant hydraulic oil pressure loss and slow actuator response.

[0006] Summary of the Invention

[0007] The purpose of this application is to provide an aerial work platform to solve the problem of long oil supply pipelines in centralized hydraulic systems, thereby reducing system energy consumption and improving the responsiveness of the terminal actuator.

[0008] In order to achieve the above objectives, the present application provides an aerial work platform, comprising:

[0009] a first hydraulic system comprising a turntable actuator disposed on the turntable, a boom actuator disposed on the boom, and a first control valve and a first electric pump group both disposed on the turntable; the turntable actuator and the boom actuator are both controlled by the first control valve, and the first electric pump group supplies oil to the first control valve;

[0010] a second hydraulic system comprising a platform actuator disposed on the working platform, a fly boom actuator disposed on the fly boom, and a second control valve and a second electric pump group, both disposed on the working platform; the platform actuator and the fly boom actuator are both controlled by the second control valve, and the second electric pump group supplies oil to the second control valve;

[0011] a power supply module, supplying power to the first electric pump unit and the second electric pump unit; and

[0012] A control module communicates with the first control valve, the second control valve, the first electric pump group, and the second electric pump group respectively.

[0013] Optionally, the power of the first electric pump group is greater than the power of the second electric pump group, and the displacement of the first electric pump group is greater than the displacement of the second electric pump group.

[0014] Optionally, the first hydraulic system further includes a radiator connected to the hydraulic circuit, and the radiator is used to reduce the temperature of the hydraulic oil in the hydraulic circuit.

[0015] Optionally, the power supply module includes an emergency power battery arranged on the turntable; the first hydraulic system also includes a first emergency electric pump group arranged on the turntable to supply oil to the first control valve; the emergency power battery supplies power to the first emergency electric pump group.

[0016] Optionally, the second hydraulic system also includes a second emergency electric pump group and / or an emergency manual pump group that can replace the second electric pump group to supply oil to the second control valve; the second emergency electric pump group is powered by the power supply module and communicates with the control module.

[0017] Optionally, the turntable actuator includes a turntable rotation motor connected to the first control valve pipeline; the boom actuator includes a boom luffing cylinder and a boom telescopic cylinder respectively connected to the first control valve pipeline.

[0018] Optionally, the platform actuator includes a platform swing cylinder and a platform leveling cylinder respectively connected to the second control valve pipeline; the flying arm actuator includes a flying arm luffing cylinder connected to the second control valve pipeline.

[0019] Optionally, the control module includes a controller arranged on the turntable and a first IO module arranged on the working platform; the controller communicates with the second control valve through the first IO module; the controller, the first IO module, the first electric pump group and the second electric pump group form a CAN communication network.

[0020] Optionally, the aerial work platform further includes:

[0021] The third hydraulic system includes a chassis actuator, a third control valve, and a third electric pump group provided on the chassis; the chassis actuator is controlled by the third control valve, and the third electric pump group supplies oil to the third control valve;

[0022] The power supply module is capable of supplying power to the third electric pump group, and the control module communicates with the third control valve and the third electric pump group respectively.

[0023] Optionally, the chassis actuator includes a chassis floating cylinder and a chassis steering cylinder connected to the third control valve pipeline.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] This application uses a distributed first hydraulic system and a second hydraulic system in combination with power transmission to fundamentally eliminate long-distance oil supply pipelines, so that the actuators in the hydraulic system can be driven nearby, reducing the pressure loss of the hydraulic oil and the impact of the low temperature environment on the viscosity of the hydraulic oil, thereby solving the problem of long oil supply pipelines in the centralized hydraulic system, and achieving the effect of reducing system energy consumption and improving the responsiveness of the terminal actuator.

[0026] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present application, but do not constitute a limitation on the embodiments of the present application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without inventive work. In the drawings:

[0028] Figure 1 is a structural diagram of an aerial work platform;

[0029] FIG2 is a wiring diagram of an aerial work platform according to a specific embodiment of the present application;

[0030] FIG3 is a schematic diagram of a first hydraulic system according to a specific embodiment of the present application;

[0031] FIG4 is a schematic diagram of a second hydraulic system according to a specific embodiment of the present application;

[0032] FIG5 is a schematic diagram of a third hydraulic system according to a specific embodiment of the present application.

[0033] Explanation of the accompanying drawings: 1 first hydraulic system; 11 turntable actuator, 12 boom actuator, 13 first control valve, 14 first electric pump group, 15 radiator, 16 first emergency electric pump group, 17 motor driver; 2 second hydraulic system; 21 platform actuator, 22 flying arm actuator, 23 second control valve, 24 second electric pump group, 25 second emergency electric pump group, 26 emergency manual pump group; 3 third hydraulic system; 31 chassis actuator, 32 third control valve, 33 third electric pump group; 41 main power battery, 42 emergency power battery; 51 controller, 52 first IO module, 53 second IO module; 61 turntable, 62 boom, 63 working platform, 64 flying arm, 65 chassis. DETAILED DESCRIPTION

[0034] The following describes the specific embodiments of the present application in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present application and are not intended to limit the present application.

[0035] As shown in Figures 2 to 4, an aerial work platform includes:

[0036] The first hydraulic system 1 includes a turntable actuator 11 provided on the turntable 61, a boom actuator 12 provided on the boom 62, and a first control valve 13 and a first electric pump unit 14, both provided on the turntable 61. The turntable actuator 11 and the boom actuator 12 are both controlled by the first control valve 13, and the first electric pump unit 14 supplies oil to the first control valve 13.

[0037] The second hydraulic system 2 includes a platform actuator 21 provided on the working platform 63, a fly arm actuator 22 provided on the fly arm 64, and a second control valve 23 and a second electric pump unit 24, both provided on the working platform 63. The platform actuator 21 and the fly arm actuator 22 are both controlled by the second control valve 23, and the second electric pump unit 24 supplies oil to the second control valve 23.

[0038] A power supply module, which supplies power to the first electric pump unit 14 and the second electric pump unit 24; and

[0039] The control module communicates with the first control valve 13 , the second control valve 23 , the first electric pump group 14 and the second electric pump group 24 respectively.

[0040] In this application, the hydraulic system is arranged according to the principle of proximity, with a first hydraulic system 1 being provided on one side of the turntable 61 for hydraulically transmitting the turntable 61 and the boom 62; and a second hydraulic system 2 being provided on the one side of the working platform 63 for hydraulically transmitting the working platform 63 and the flying boom 64. In the first hydraulic system 1, the first electric pump group 14, the first control valve 13, the boom actuator 12, and the turntable actuator 11 are interconnected by pipes to form an independent hydraulic transmission circuit. In the second hydraulic system 2, the second electric pump group 24, the second control valve 23, the flying boom actuator 22, and the platform actuator 21 are interconnected by pipes to form another independent hydraulic transmission circuit. The power supply module supplies power to the first hydraulic system 1 and the second hydraulic system 2. The control module controls the movement of the turntable actuator 11, the boom actuator 12, the platform actuator 21, and the flying boom actuator 22 through electrical signals. Compared with the existing technology, the first hydraulic system 1 and the second hydraulic system 2 of the present application only need to be powered and communicated through cables, eliminating the long oil supply pipelines. The actuators in each hydraulic transmission circuit are driven by their respective matching nearby electric pump groups and control valves; the oil supply pipelines are short, and the pressure loss of the hydraulic oil is small. At the same time, it also avoids the situation in which the viscosity of the hydraulic oil increases in low temperature environments, causing the actuator's action to respond slowly; thereby solving the disadvantages of the long oil supply pipelines of the centralized hydraulic system.

[0041] In addition, compared with the existing technology, since the hydraulic transmission circuits of the first hydraulic system 1 and the second hydraulic system 2 are independent of each other and transmission decoupling is performed, the specifications of the hydraulic components in the hydraulic transmission circuit can be flexibly configured according to the power requirements of their respective actuators, thereby achieving more precise energy transmission and control, reducing the production cost and overall energy consumption of the aerial work platform; and also facilitating fault inspection and repair.

[0042] Specifically, the turntable actuator 11 includes a turntable slew motor connected to the first control valve 13 via a pipeline. The boom actuator 12 includes a boom luffing cylinder and a boom extension cylinder, each connected to the first control valve 13 via a pipeline. The turntable slew motor drives the turntable 61 to rotate relative to the chassis 65. The boom luffing cylinder drives the boom 62 to luff relative to the turntable 61, while the boom extension cylinder drives the boom 62 to extend and retract. Together, these two cylinders change the aerial position of the work platform 63 at the top of the boom 62.

[0043] Specifically, the platform actuator 21 includes a platform swing cylinder and a platform leveling cylinder, each connected to the second control valve 23 by piping. The fly-jib actuator 22 includes a fly-jib luffing cylinder, also connected to the second control valve 23 by piping. The platform swing cylinder and the platform leveling cylinder are used to adjust the mid-air attitude of the work platform 63. The fly-jib luffing cylinder is used to drive the fly-jib 64 to luff relative to the boom 62, further adjusting the mid-air position of the work platform 63.

[0044] Specifically, the power of the first electric pump unit 14 is greater than that of the second electric pump unit 24, and the displacement of the first electric pump unit 14 is greater than that of the second electric pump unit 24. Compared to the work platform 63 side, the turntable 61 side carries more weight of the aerial work platform and has a larger load moment. Therefore, the loads on the turntable actuator 11 and the boom actuator 12 are greater than those on the platform actuator 21 and the fly arm actuator 22, and naturally require more power and displacement. Therefore, the first electric pump unit 14, as the hydraulic source of the first hydraulic system 1, needs to have greater power and displacement.

[0045] In some embodiments, both the first control valve 13 and the second control valve 23 are multi-position, multi-way electromagnetic control valves, each electrically connected to a control module, for controlling the on / off of different hydraulic circuits. The first electric pump assembly 14 is connected to the first control valve 13 by piping and can employ a single motor and multiple hydraulic pumps, or multiple single motors and a single hydraulic pump. The first electric pump assembly 14 can optionally utilize an AC motor, configured to be driven and parameterized by a motor driver 17. The second electric pump assembly 24 is connected to the second control valve 23 by piping and can utilize a single DC motor and a single hydraulic pump.

[0046] Specifically, the first hydraulic system 1 also includes a radiator 15 connected to the hydraulic circuit. Radiator 15 is used to reduce the temperature of the hydraulic oil in the hydraulic circuit. Because the turntable actuator 11 and the boom actuator 12 are subjected to heavy loads, the hydraulic oil in their hydraulic circuits heats up quickly, necessitating the addition of radiator 15.

[0047] In some embodiments, the radiator 15 is disposed on the turntable 61 , and a pipeline is connected to the first control valve 13 , and is located on the oil return side of its hydraulic circuit.

[0048] In some embodiments, the power supply module includes a main power battery 41 mounted on the chassis 65 or turntable 61. Positive and negative power cables run through the chassis 65, turntable 61, and work platform 63, providing power to various electrical components of the aerial work platform, forming a power supply network. The power supply module does not limit the number of electrical components it can load, provided its own conditions allow.

[0049] Specifically, the power supply module includes an emergency power battery 42 mounted on the turntable 61. The first hydraulic system 1 also includes a first emergency electric pump unit 16 mounted on the turntable 61, which supplies oil to the first control valve 13. The emergency power battery 42 provides power to the first emergency electric pump unit 16. The aerial position of the working platform 63 is primarily controlled by the turntable actuator 11 and the boom actuator 12. To ensure the safety of operators, a redundant first emergency electric pump unit 16 and emergency power battery 42 are provided to replace the first electric pump unit 14 and main power battery 41 when appropriate. This allows the working platform 63 to be safely lowered to the ground in the event of a failure.

[0050] In some embodiments, the first emergency electric pump unit 16 is connected to the first control valve 13 through a pipeline and communicates with the control module.

[0051] Specifically, the second hydraulic system 2 also includes a second emergency electric pump unit 25 and / or an emergency manual pump unit 26, which can replace the second electric pump unit 24 in supplying oil to the second control valve 23. The second emergency electric pump unit 25 is powered by the power supply module and communicates with the control module. The redundant second emergency electric pump unit 25 or emergency manual pump unit 26 ensures that the aerial posture of the work platform 63 can continue to be adjusted to complete aerial operations in the event of a failure of the second electric pump unit 24.

[0052] Specifically, the control module includes a controller 51 mounted on a turntable 61 and a first I / O module 52 mounted on a work platform 63. The controller 51 communicates with the second control valve 23 via the first I / O module 52. The controller 51, the first I / O module 52, the first electric pump unit 14, and the second electric pump unit 24 form a CAN communication network. Because the first hydraulic system 1 is located on one side of the turntable 61 and the second hydraulic system 2 is located on the other side of the work platform 63, the use of a CAN communication network reduces signal interference, simplifies wiring, and facilitates expansion and connection with other CAN-capable components.

[0053] In some embodiments, the controller 51 can communicate directly with the first control valve 13 and the first emergency electric pump unit 16 for control. The controller 51 sends signals to the motor driver 17 of the first electric pump unit 14 and the DC motor of the second electric pump unit 24 via the CAN communication network to monitor and adjust parameters such as motor current and speed. The first IO module 52 receives the signals sent by the controller 51 via the CAN communication network and converts them into analog outputs to control the second control valve 23.

[0054] As shown in Figures 2 and 5, specifically, the aerial work platform also includes:

[0055] The third hydraulic system 3 includes a chassis actuator 31, a third control valve 32, and a third electric pump unit 33 disposed on the chassis 65. The chassis actuator 31 is controlled by the third control valve 32, and the third electric pump unit 33 supplies oil to the third control valve 32.

[0056] The power supply module can supply power to the third electric pump group 33 , and the control module communicates with the third control valve 32 and the third electric pump group 33 respectively.

[0057] In this application, a third hydraulic system 3 is positioned adjacent to the chassis 65 to provide hydraulic power to the chassis 65. The third electric pump unit 33, the third control valve 32, and the chassis actuator 31 are interconnected by pipes to form an independent hydraulic power transmission circuit. The third hydraulic system 3 is connected to the aforementioned power supply network and CAN communication network via cables. The hydraulic power transmission circuits of the first, second, and third hydraulic systems 1, 2, and 3 are independent of each other, forming a distributed power aerial work platform.

[0058] Specifically, the chassis actuator 31 includes a chassis floating cylinder and a chassis steering cylinder connected to the third control valve 32. The chassis floating cylinder is used to adjust the posture of the chassis 65. The chassis steering cylinder is used to drive the chassis 65 to steer.

[0059] Specifically, the power of the first electric pump group 14 is greater than the power of the third electric pump group 33 , and the displacement of the first electric pump group 14 is greater than the displacement of the third electric pump group 33 .

[0060] In some embodiments, the third control valve 32 is a multi-position, multi-way electromagnetic control valve for controlling the on / off of different hydraulic circuits. The third electric pump unit 33 is connected to the third control valve 32 by a pipeline and can be a single DC motor-single hydraulic pump.

[0061] In some embodiments, the chassis 65 is an electric wheeled chassis, and the main power battery 41 of the power supply module is the power battery onboard the electric wheeled chassis. The control module also includes a second I / O module 53 disposed on the chassis 65. The controller 51 communicates with the third control valve 32 through the second I / O module 53. The controller 51 sends signals to the DC motor of the third electric pump assembly 33 via the CAN communication network to monitor and adjust parameters such as motor current and speed. The second I / O module 53 receives the signals sent by the controller 51 via the CAN communication network and converts them into analog outputs to control the third control valve 32.

[0062] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0063] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0064] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0065] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. An aerial work platform, characterized in that, Comprising: A first hydraulic system (1), including a turntable actuator (11) arranged on the turntable (61), a boom actuator (12) arranged on the boom (62), and a first control valve (13) and a first electric pump unit (14) both arranged on the turntable (61); the turntable actuator (11) and the boom actuator (12) are both controlled by the first control valve (13), and the first electric pump unit (14) supplies oil to the first control valve (13); A second hydraulic system (2), including a platform actuator (21) arranged on the work platform (63), a fly jib actuator (22) arranged on the fly jib (64), and a second control valve (23) and a second electric pump unit (24) both arranged on the work platform (63); the platform actuator (21) and the fly jib actuator (22) are both controlled by the second control valve (23), and the second electric pump unit (24) supplies oil to the second control valve (23); A power supply module for supplying power to the first electric pump unit (14) and the second electric pump unit (24); And A control module, which communicates with the first control valve (13), the second control valve (23), the first electric pump unit (14), and the second electric pump unit (24) respectively.

2. The aerial work platform according to claim 1, characterized in that, The power of the first electric pump unit (14) is greater than that of the second electric pump unit (24), and the displacement of the first electric pump unit (14) is greater than that of the second electric pump unit (24).

3. The aerial work platform according to claim 2, wherein The first hydraulic system (1) further includes a radiator (15) connected to the hydraulic circuit, and the radiator (15) is used to reduce the temperature of the hydraulic oil in the hydraulic circuit.

4. The aerial work platform according to claim 1, characterized in that, The power supply module includes an emergency power battery (42) arranged on the turntable (61); the first hydraulic system (1) further includes a first emergency electric pump unit (16) arranged on the turntable (61) for supplying oil to the first control valve (13); the emergency power battery (42) supplies power to the first emergency electric pump unit (16).

5. The aerial work platform according to claim 1, characterized in that, The second hydraulic system (2) further includes a second emergency electric pump unit (25) and / or an emergency manual pump unit (26) that can supply oil to the second control valve (23) instead of the second electric pump unit (24); the second emergency electric pump unit (25) is powered by the power supply module and communicates with the control module.

6. The aerial work platform according to claim 1, characterized in that, The turntable actuator (11) includes a turntable slewing motor connected to the first control valve (13) through a pipeline; the boom actuator (12) includes a boom luffing cylinder and a boom telescopic cylinder respectively connected to the first control valve (13) through pipelines.

7. The aerial work platform according to claim 1, characterized in that, The platform actuator (21) includes a platform swing cylinder and a platform leveling cylinder respectively connected to the second control valve (23) through pipelines; the fly jib actuator (22) includes a fly jib luffing cylinder connected to the second control valve (23) through a pipeline.

8. The aerial work platform according to claim 1, characterized in that, The control module includes a controller (51) disposed on the turntable (61) and a first IO module (52) disposed on the work platform (63); the controller (51) communicates with the second control valve (23) through the first IO module (52); the controller (51), the first IO module (52), the first electric pump unit (14) and the second electric pump unit (24) form a CAN communication network.

9. The aerial work platform according to any one of claims 1 to 8, characterized in that, The aerial work platform further includes: A third hydraulic system (3), including a chassis actuator (31), a third control valve (32) and a third electric pump unit (33) disposed on the chassis (65); the chassis actuator (31) is controlled by the third control valve (32), and the third electric pump unit (33) supplies oil to the third control valve (32); Wherein, the power supply module can supply power to the third electric pump unit (33), and the control module communicates with the third control valve (32) and the third electric pump unit (33) respectively.

10. The aerial work platform according to claim 9, wherein, The chassis actuator (31) includes a chassis floating oil cylinder and a chassis steering oil cylinder that are connected to the third control valve (32) through pipelines.

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