Aerial work platform

Abstract

Provided is an aerial work platform, including a first hydraulic system, a second hydraulic system, a power supply module, and a control module. The first hydraulic system includes a turntable actuator on a turntable, a boom actuator on a boom, and a first control valve and a first electric pump set both on the turntable, where the actuators are controlled by the first control valve that is supplied by the first electric pump set. The second hydraulic system includes a platform actuator on a work platform, a fly jib actuator on a fly jib, and a second control valve and a second electric pump set both on the work platform, where the actuators are controlled by a second control valve that is supplied by the second electric pump set. This design addresses the long oil supply pipeline in centralized hydraulic systems, reducing energy consumption and improving end actuator responsiveness.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] The present application claims the benefit of Chinese Patent Application No. 202410095265.8 filed on January 23, 2024, the entire content of which is incorporated herein by reference.TECHNICAL FIELD

[0002] The present application relates to engineering machinery, and in particular to an aerial work platform.BACKGROUND

[0003] Aerial work platforms are a type of engineering machinery that serves mobile aerial work such as aerial work, equipment installation, and maintenance in various industries. As shown in FIG. 1, an aerial work platform generally includes: a turntable 61, a boom 62, a work platform 63, a fly jib 64, and a chassis 65. The chassis 65 can move freely. The turntable 61 is mounted on the chassis 65 and can rotate relative to the chassis 65. The bottom end of the boom 62 is mounted on the turntable 61, and the top end of the boom 62 is sequentially mounted with the fly jib 64 and the work platform 63. The boom 62 and the fly jib 64 can drive the work platform 63 to move in the air.

[0004] For existing aerial work platforms, a centralized hydraulic system is generally used for transmission. To be specific, the hydraulic source is centrally provided by a hydraulic pump set located on the chassis 65, and the hydraulic oil is centrally supplied to multiple control valves through oil supply pipelines. Then, the control valves distribute and control the total flow according to the needs of each actuator at each position. For an aerial work platform with a long boom 62, the actuator at the end of the boom 62 is far away from the hydraulic source, and the oil supply pipeline for hydraulic transmission is long, leading to problems such as large pressure loss of hydraulic oil and slow actuator response.SUMMARY

[0005] The purpose of the present application is to provide an aerial work platform for solving the long oil supply pipeline problem in centralized hydraulic systems, to reduce system energy consumption and improve the responsiveness of end actuators.

[0006] In order to achieve the above purpose, the present application provides an aerial work platform, comprising: a first hydraulic system, which includes a turntable actuator arranged on a turntable, a boom actuator arranged on a boom, and a first control valve and a first electric pump set both arranged on the turntable; the turntable actuator and the boom actuator are controlled by the first control valve, and the first electric pump set supplies oil to the first control valve; a second hydraulic system, which includes a platform actuator arranged on a work platform, a fly jib actuator arranged on a fly jib, and a second control valve and a second electric pump set both arranged on the work platform; the platform actuator and the fly jib actuator are controlled by the second control valve, and the second electric pump set supplies oil to the second control valve; a power supply module, which supplies power to the first electric pump set and the second electric pump set; and a control module, which communicates with the first control valve, the second control valve, the first electric pump set, and the second electric pump set respectively.

[0007] Optionally, the power of the first electric pump set is higher than that of the second electric pump set, and the displacement of the first electric pump set is larger than that of the second electric pump set.

[0008] Optionally, the first hydraulic system further includes a radiator connected to a hydraulic circuit, and the radiator is used to lower the temperature of the hydraulic oil in the hydraulic circuit.

[0009] Optionally, the power supply module includes an emergency power battery arranged on the turntable. The first hydraulic system further includes a first emergency electric pump set arranged on the turntable to supply oil to the first control valve. The emergency power battery supplies power to the first emergency electric pump set.

[0010] Optionally, the second hydraulic system further includes a second emergency electric pump set and / or an emergency manual pump set that can replace the second electric pump set to supply oil to the second control valve. The second emergency electric pump set is powered by the power supply module, and communicates with the control module.

[0011] Optionally, the turntable actuator includes a turntable rotation motor connected to the first control valve by a pipeline. The boom actuator includes a boom luffing cylinder and a telescopic boom cylinder respectively connected to the first control valve by a pipeline.

[0012] Optionally, the platform actuator includes a platform swing cylinder and a platform leveling cylinder respectively connected to the second control valve by a pipeline. The fly jib actuator includes a fly jib luffing cylinder connected to the second control valve by a pipeline.

[0013] Optionally, the control module includes a controller arranged on the turntable and a first I / O module arranged on the work platform. The controller communicates with the second control valve through the first I / O module. The controller, the first I / O module, the first electric pump set, and the second electric pump set form a CAN communication network.

[0014] Optionally, the aerial work platform also includes: a third hydraulic system, which includes a chassis actuator arranged on the chassis, a third control valve, and a third electric pump set. The chassis actuator is controlled by the third control valve, and the third electric pump set supplies oil to the third control valve.

[0015] Specifically, the power supply module can supply power to the third electric pump set, and the control module communicates with the third control valve and the third electric pump set respectively.

[0016] Optionally, the chassis actuator includes a chassis floating cylinder and a chassis steering cylinder connected to the third control valve by pipelines.

[0017] Compared with the prior art, the present application has the following beneficial effects: The present application fundamentally eliminates the long-distance oil supply pipelines through the distributed first hydraulic system and second hydraulic system, in combined with power transmission. This enables the actuators in the hydraulic systems to be driven nearby, reducing the pressure loss of the hydraulic oil, and decreasing the influence of the low-temperature environment on the viscosity of the hydraulic oil, thereby solving the long oil supply pipeline problem in the centralized hydraulic systems, reducing system energy consumption, and improving the responsiveness of end actuators.

[0018] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent DESCRIPTION OF EMBODIMENTS.BRIEF DESCRIPTION OF DRAWINGS

[0019] The drawings are used to provide a further understanding of the embodiments of the present application and form part of the specification. They are used to explain the embodiments of the present application together with the following detailed embodiments, but do not constitute a limitation on the embodiments of the present application. For persons of ordinary skill in the art, other drawings can also be obtained based on the structures shown in these drawings without creative efforts. In the drawings: FIG. 1 is a structural diagram of an aerial work platform; FIG. 2 is a wiring diagram of the aerial work platform according to an embodiment of the present application; FIG. 3 is a schematic diagram of the first hydraulic system according to an embodiment of the present application; FIG. 4 is a schematic diagram of the second hydraulic system according to an embodiment of the present application; and FIG. 5 is a schematic diagram of the third hydraulic system according to an embodiment of the present application. Reference numerals:

[0020] 1: first hydraulic system; 11: turntable actuator; 12: boom actuator; 13: first control valve; 14: first electric pump set; 15: radiator; 16: first emergency electric pump set; and 17: motor driver; 2: second hydraulic system; 21: platform actuator; 22: fly jib actuator; 23: second control valve; 24: second electric pump set; 25: second emergency electric pump set; and 26: emergency manual pump set; 3: third hydraulic system; 31: chassis actuator; 32: third control valve; 33: third electric pump set; 41: main power battery; 42: emergency power battery; 51: controller; 52: first I / O module; 53: second I / O module; 61: turntable; 62: boom; 63: work platform; 64: fly jib; and 65: chassis. DESCRIPTION OF EMBODIMENTS

[0021] The embodiments of the present application will be described in detail below with reference to the drawings. It should be understood that the embodiments described herein are only to explain the present application, and are not intended to limit the present application.

[0022] FIG. 2 to FIG. 4 show an aerial work platform, comprising: a first hydraulic system 1, which includes a turntable actuator 11 arranged on a turntable 61, a boom actuator 12 arranged on a boom 62, and a first control valve 13 and a first electric pump set 14 both arranged on the turntable 61; the turntable actuator 11 and the boom actuator 12 are controlled by the first control valve 13, and the first electric pump set 14 supplies oil to the first control valve 13; a second hydraulic system 2, which includes a platform actuator 21 arranged on a work platform 63, a fly jib actuator 22 arranged on a fly jib 64, and a second control valve 23 and a second electric pump set 24 both arranged on the work platform 63; the platform actuator 21 and the fly jib actuator 22 are controlled by the second control valve 23, and the second electric pump set 24 supplies oil to the second control valve 23; a power supply module, which supplies power to the first electric pump set 14 and the second electric pump set 24; and a control module, which communicates with the first control valve 13, the second control valve 23, the first electric pump set 14, and the second electric pump set 24 respectively.

[0023] In the present application, hydraulic systems are set based on the principle of proximity. To be specific, the first hydraulic system 1 is set on the turntable 61 side for hydraulic transmission of the turntable 61 and the boom 62, and the second hydraulic system 2 is set on the work platform 63 side for hydraulic transmission of the work platform 63 and the fly jib 64. In the first hydraulic system 1, the first electric pump set 14, the first control valve 13, the boom actuator 12, and the turntable actuator 11 are mutually connected by pipelines to form an independent hydraulic transmission circuit. In the second hydraulic system 2, the second electric pump set 24, the second control valve 23, the fly jib actuator 22, and the platform actuator 21 are mutually connected by pipelines to form the other 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 actions of the turntable actuator 11, boom actuator 12, platform actuator 21, and fly jib actuator 22 through electrical signals. Compared with the prior art, the first hydraulic system 1 and the second hydraulic system 2 in the present application only need to be connected by cables for power supply and communication. This eliminates long-distance oil supply pipelines, and enables actuators in each hydraulic transmission circuit to be driven by their respective matching nearby electric pump sets and control valves, shortening the oil supply pipelines and reducing the pressure loss of the hydraulic oil. Furthermore, this also avoids slow responses of actuators caused by the increase of hydraulic oil viscosity in the low-temperature environment, thereby effectively addressing the disadvantages associated with the long oil supply pipelines in centralized hydraulic systems.

[0024] In addition, compared with the prior art, the hydraulic transmission circuits of the first hydraulic system 1 and the second hydraulic system 2 are independent of each other and are decoupled for transmission. Therefore, specifications of hydraulic components in each hydraulic transmission circuit can be flexibly configured according to the power requirements of their actuators. This can achieve more precise energy transfer and control, reduce production costs and overall energy consumption of the aerial work platform, and make troubleshooting convenient.

[0025] Specifically, the turntable actuator 11 includes a turntable rotation motor connected to the first control valve 13 by a pipeline. The boom actuator 12 includes a boom luffing cylinder and a telescopic boom cylinder respectively connected to the first control valve 13 by a pipeline. The turntable rotation motor is used to drive the turntable 61 to rotate relative to a chassis 65. The boom luffing cylinder is used to drive the boom 62 to perform luffing relative to the turntable 61, and the telescopic boom cylinder is used to drive the boom 62 to extend or retract. The two cylinders together change the aerial position of the work platform 63 at the top of the boom 62.

[0026] Specifically, the platform actuator 21 includes a platform swing cylinder and a platform leveling cylinder respectively connected to the second control valve 23 by a pipeline. The fly jib actuator 22 includes a fly jib luffing cylinder connected to the second control valve 23 by a pipeline. The platform swing cylinder and the platform leveling cylinder are used to adjust the aerial posture 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, and further adjust the aerial position of the work platform 63.

[0027] Specifically, the power of the first electric pump set 14 is higher than that of the second electric pump set 24, and the displacement of the first electric pump set 14 is larger than that of the second electric pump set 24. Compared with the work platform 63 side, the turntable 61 side bears more weight of the aerial work platform and has a larger load torque. The turntable actuator 11 and the boom actuator 12 bear more load than the platform actuator 21 and the fly jib actuator 22, and naturally require more power and displacement. Therefore, the first electric pump set 14, as the hydraulic source of the first hydraulic system 1, needs to have higher power and larger displacement.

[0028] In some embodiments, the first control valve 13 and the second control valve 23 are both multi-position multi-way electromagnetic control valves, and are electrically connected to the control module for controlling the on and off of different hydraulic circuits. The first electric pump set 14 is connected to the first control valve 13 by a pipeline. The selectable form can be a motor and multiple hydraulic pumps, or multiple motors and a hydraulic pump. The first electric pump set 14 can be an AC motor and is configured to be driven by a motor driver 17 for motor driving and parameter adjustment. The second electric pump set 24 is connected to the second control valve 23 by a pipeline, and the selectable form can be a DC motor and a hydraulic pump.

[0029] Specifically, the first hydraulic system 1 also includes a radiator 15 connected to the hydraulic circuit, and the radiator 15 is used to lower the temperature of the hydraulic oil in the hydraulic circuit. The turntable actuator 11 and the boom actuator 12 bear high load, and the hydraulic oil in their hydraulic circuits heats up quickly. Therefore, setting the radiator 15 is necessary.

[0030] In some embodiments, the radiator 15 is installed on the turntable 61. It is connected to the first control valve 13 by a pipeline and located on the oil return side of its hydraulic circuit.

[0031] In some embodiments, the power supply module includes a main power battery 41 arranged on the chassis 65 or the turntable 61. The positive and negative power supply cables run through the chassis 65, the turntable 61, and the work platform 63 to supply power to electrical devices of the aerial work platform, forming a power supply network. The power supply module does not limit the number of electrical devices loaded if its conditions permit.

[0032] Specifically, the power supply module includes an emergency power battery 42 arranged on the turntable 61. The first hydraulic system 1 also includes a first emergency electric pump set 16 arranged on the turntable 61 to supply oil to the first control valve 13. The emergency power battery 42 supplies power to the first emergency electric pump set 16. For the aerial work platform, the aerial position of its work platform 63 is mainly controlled by the turntable actuator 11 and the boom actuator 12. To ensure the safety of operators, a redundant first emergency electric pump set 16 and the emergency power battery 42 are provided to replace the first electric pump set 14 and the main power battery 41 at a proper time, to ensure that the work platform 63 can still be safely lowered to the ground in case of a failure.

[0033] In some embodiments, the first emergency electric pump set 16 is connected to the first control valve 13 by a pipeline, and communicates with the control module.

[0034] Specifically, the second hydraulic system 2 also includes a second emergency electric pump set 25 and / or an emergency manual pump set 26 that can replace the second electric pump set 24 to supply oil to the second control valve 23. The second emergency electric pump set 25 is powered by the power supply module, and communicates with the control module. A redundant second emergency electric pump set 25 or the emergency manual pump set 26 is provided to ensure that when the second electric pump set 24 fails, the aerial posture of the work platform 63 can still be adjusted to complete the aerial work.

[0035] Specifically, the control module includes a controller 51 arranged on the turntable 61 and a first I / O module 52 arranged on the work platform 63. The controller 51 communicates with the second control valve 23 through the first I / O module 52. The controller 51, the first I / O module 52, the first electric pump set 14, and the second electric pump set 24 form a CAN communication network. The first hydraulic system 1 is located on the turntable 61 side and the second hydraulic system 2 is located on the work platform 63 side. The two hydraulic systems are far apart from each other. Using a CAN communication network can reduce signal interference, simplify connection lines, and also facilitate the connection with other components that have CAN communication capabilities.

[0036] In some embodiments, the controller 51 may directly communicate with the first control valve 13 and the first emergency electric pump set 16 for control. The controller 51 sends signals to the motor driver 17 of the first electric pump set 14 and the DC motor of the second electric pump set 24 through the CAN communication network, to monitor and adjust their motor current, speed, and other parameters. The first I / O module 52 receives the signals sent by the controller 51 through the CAN communication network and converts them into analog outputs to control the second control valve 23.

[0037] As shown in FIG. 2 and FIG. 5, specifically, the aerial work platform also includes: a third hydraulic system 3, which includes a chassis actuator 31 arranged on the chassis 65, a third control valve 32, and a third electric pump set 33. The chassis actuator 31 is controlled by the third control valve 32, and the third electric pump set 33 supplies oil to the third control valve 32.

[0038] Specifically, the power supply module can power the third electric pump set 33, and the control module communicates with the third control valve 32 and the third electric pump set 33 respectively.

[0039] In the present application, the third hydraulic system 3 is provided near the chassis 65 side for hydraulic transmission of the chassis 65. Among them, the third electric pump set 33, the third control valve 32, and the chassis actuator 31 are mutually connected by pipelines to form an independent hydraulic transmission circuit. The third hydraulic system 3 is connected to the power supply network and the CAN communication network through cables. The hydraulic transmission circuits of the first hydraulic system 1, the second hydraulic system 2, and the third hydraulic system 3 are independent of each other, forming an aerial work platform with distributed power.

[0040] Specifically, the chassis actuator 31 includes a chassis floating cylinder and a chassis steering cylinder connected to the third control valve 32 by pipelines. The chassis floating cylinder is used to adjust the posture of the chassis 65. The chassis steering cylinder is used to steer the chassis 65.

[0041] Specifically, the power of the first electric pump set 14 is higher than that of the third electric pump set 33, and the displacement of the first electric pump set 14 is larger than that of the third electric pump set 33.

[0042] In some embodiments, the third control valve 32 is a multi-position multi-way electromagnetic control valve, used to control the on and off of different hydraulic circuits. The third electric pump set 33 is connected to the third control valve 32 by a pipeline, and the selectable form can be a DC motor and a hydraulic pump.

[0043] In some embodiments, the chassis 65 is an electric wheeled chassis, and the main power battery 41 of the power supply module is a power battery mounted on the electric wheeled chassis. The control module also includes a second I / O module 53 arranged 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 set 33 through the CAN communication network, to monitor and adjust its motor current, speed, and other parameters. The second I / O module 53 receives the signals sent by the controller 51 through the CAN communication network and converts them into analog outputs to control the third control valve 32.

[0044] In the description of the present application, it should be understood that the terms "first" and "second" are used merely for illustrative purposes and shall not be construed as indicating or implying relative importance or as implicitly specifying the number of technical features referred to. To this end, the features defined with the terms "first" and "second" may explicitly or implicitly include at least one of the features. In the context of the present application, unless otherwise specifically defined, "multiple" means at least two, for example, two or three.

[0045] In the present application, unless otherwise expressly specified and defined, the terms "mount", "be connected to", "be connected with", "fix", and so forth shall be interpreted in a broad sense. For example, the connection can be fixed connection, detachable connection, integrated connection, mechanical connection, electrical connection, connection capable of communicating with each other, direct connection, indirect connection through intermediate media, connection between two components or interaction between two components, unless otherwise specifically defined. For those of ordinary skill in the art, the specific meaning of the preceding terms in the present application can be understood according to the specific situation.

[0046] In the description of the specification, descriptions with reference to the terms "an embodiment", "some embodiments", "example", "specific example", or "some examples" mean that specific features, structures, materials, or characteristics described in combination with the embodiment or example are contained in at least an embodiment or example of the present application. In the specification, the schematic expressions of the above terms do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. Furthermore, the technicians in this field may combine different embodiments or examples described in the specification and features of different embodiments or examples without contradiction.

[0047] Although the embodiment of the present application has been shown and described above, it can be understood that the above embodiment is exemplary and cannot be understood as a limitation on the present application. The changes, modifications, replacements, and improvements can be made to the above embodiment within the scope of the present application for ordinary persons skilled in the art.

Examples

Embodiment Construction

[0021]The embodiments of the present application will be described in detail below with reference to the drawings. It should be understood that the embodiments described herein are only to explain the present application, and are not intended to limit the present application.

[0022]FIG. 2 to FIG. 4 show an aerial work platform, comprising:

a first hydraulic system 1, which includes a turntable actuator 11 arranged on a turntable 61, a boom actuator 12 arranged on a boom 62, and a first control valve 13 and a first electric pump set 14 both arranged on the turntable 61; the turntable actuator 11 and the boom actuator 12 are controlled by the first control valve 13, and the first electric pump set 14 supplies oil to the first control valve 13; a second hydraulic system 2, which includes a platform actuator 21 arranged on a work platform 63, a fly jib actuator 22 arranged on a fly jib 64, and a second control valve 23 and a second electric pump set 24 both arranged on the work platform...

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] The present application claims the benefit of Chinese Patent Application No. 202410095265.8 filed on January 23, 2024, the entire content of which is incorporated herein by reference.TECHNICAL FIELD

[0002] The present application relates to engineering machinery, and in particular to an aerial work platform.BACKGROUND

[0003] Aerial work platforms are a type of engineering machinery that serves mobile aerial work such as aerial work, equipment installation, and maintenance in various industries. As shown in FIG. 1, an aerial work platform generally includes: a turntable 61, a boom 62, a work platform 63, a fly jib 64, and a chassis 65. The chassis 65 can move freely. The turntable 61 is mounted on the chassis 65 and can rotate relative to the chassis 65. The bottom end of the boom 62 is mounted on the turntable 61, and the top end of the boom 62 is sequentially mounted with the fly jib 64 and the work platform 63. The boom 62 and the fly jib 64 can drive the work platform 63 to move in the air.

[0004] For existing aerial work platforms, a centralized hydraulic system is generally used for transmission. To be specific, the hydraulic source is centrally provided by a hydraulic pump set located on the chassis 65, and the hydraulic oil is centrally supplied to multiple control valves through oil supply pipelines. Then, the control valves distribute and control the total flow according to the needs of each actuator at each position. For an aerial work platform with a long boom 62, the actuator at the end of the boom 62 is far away from the hydraulic source, and the oil supply pipeline for hydraulic transmission is long, leading to problems such as large pressure loss of hydraulic oil and slow actuator response.SUMMARY

[0005] The purpose of the present application is to provide an aerial work platform for solving the long oil supply pipeline problem in centralized hydraulic systems, to reduce system energy consumption and improve the responsiveness of end actuators.

[0006] In order to achieve the above purpose, the present application provides an aerial work platform, comprising: a first hydraulic system, which includes a turntable actuator arranged on a turntable, a boom actuator arranged on a boom, and a first control valve and a first electric pump set both arranged on the turntable; the turntable actuator and the boom actuator are controlled by the first control valve, and the first electric pump set supplies oil to the first control valve; a second hydraulic system, which includes a platform actuator arranged on a work platform, a fly jib actuator arranged on a fly jib, and a second control valve and a second electric pump set both arranged on the work platform; the platform actuator and the fly jib actuator are controlled by the second control valve, and the second electric pump set supplies oil to the second control valve; a power supply module, which supplies power to the first electric pump set and the second electric pump set; and a control module, which communicates with the first control valve, the second control valve, the first electric pump set, and the second electric pump set respectively.

[0007] Optionally, the power of the first electric pump set is higher than that of the second electric pump set, and the displacement of the first electric pump set is larger than that of the second electric pump set.

[0008] Optionally, the first hydraulic system further includes a radiator connected to a hydraulic circuit, and the radiator is used to lower the temperature of the hydraulic oil in the hydraulic circuit.

[0009] Optionally, the power supply module includes an emergency power battery arranged on the turntable. The first hydraulic system further includes a first emergency electric pump set arranged on the turntable to supply oil to the first control valve. The emergency power battery supplies power to the first emergency electric pump set.

[0010] Optionally, the second hydraulic system further includes a second emergency electric pump set and / or an emergency manual pump set that can replace the second electric pump set to supply oil to the second control valve. The second emergency electric pump set is powered by the power supply module, and communicates with the control module.

[0011] Optionally, the turntable actuator includes a turntable rotation motor connected to the first control valve by a pipeline. The boom actuator includes a boom luffing cylinder and a telescopic boom cylinder respectively connected to the first control valve by a pipeline.

[0012] Optionally, the platform actuator includes a platform swing cylinder and a platform leveling cylinder respectively connected to the second control valve by a pipeline. The fly jib actuator includes a fly jib luffing cylinder connected to the second control valve by a pipeline.

[0013] Optionally, the control module includes a controller arranged on the turntable and a first I / O module arranged on the work platform. The controller communicates with the second control valve through the first I / O module. The controller, the first I / O module, the first electric pump set, and the second electric pump set form a CAN communication network.

[0014] Optionally, the aerial work platform also includes: a third hydraulic system, which includes a chassis actuator arranged on the chassis, a third control valve, and a third electric pump set. The chassis actuator is controlled by the third control valve, and the third electric pump set supplies oil to the third control valve.

[0015] Specifically, the power supply module can supply power to the third electric pump set, and the control module communicates with the third control valve and the third electric pump set respectively.

[0016] Optionally, the chassis actuator includes a chassis floating cylinder and a chassis steering cylinder connected to the third control valve by pipelines.

[0017] Compared with the prior art, the present application has the following beneficial effects: The present application fundamentally eliminates the long-distance oil supply pipelines through the distributed first hydraulic system and second hydraulic system, in combined with power transmission. This enables the actuators in the hydraulic systems to be driven nearby, reducing the pressure loss of the hydraulic oil, and decreasing the influence of the low-temperature environment on the viscosity of the hydraulic oil, thereby solving the long oil supply pipeline problem in the centralized hydraulic systems, reducing system energy consumption, and improving the responsiveness of end actuators.

[0018] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent DESCRIPTION OF EMBODIMENTS.BRIEF DESCRIPTION OF DRAWINGS

[0019] The drawings are used to provide a further understanding of the embodiments of the present application and form part of the specification. They are used to explain the embodiments of the present application together with the following detailed embodiments, but do not constitute a limitation on the embodiments of the present application. For persons of ordinary skill in the art, other drawings can also be obtained based on the structures shown in these drawings without creative efforts. In the drawings: FIG. 1 is a structural diagram of an aerial work platform; FIG. 2 is a wiring diagram of the aerial work platform according to an embodiment of the present application; FIG. 3 is a schematic diagram of the first hydraulic system according to an embodiment of the present application; FIG. 4 is a schematic diagram of the second hydraulic system according to an embodiment of the present application; and FIG. 5 is a schematic diagram of the third hydraulic system according to an embodiment of the present application. Reference numerals:

[0020] 1: first hydraulic system; 11: turntable actuator; 12: boom actuator; 13: first control valve; 14: first electric pump set; 15: radiator; 16: first emergency electric pump set; and 17: motor driver; 2: second hydraulic system; 21: platform actuator; 22: fly jib actuator; 23: second control valve; 24: second electric pump set; 25: second emergency electric pump set; and 26: emergency manual pump set; 3: third hydraulic system; 31: chassis actuator; 32: third control valve; 33: third electric pump set; 41: main power battery; 42: emergency power battery; 51: controller; 52: first I / O module; 53: second I / O module; 61: turntable; 62: boom; 63: work platform; 64: fly jib; and 65: chassis. DESCRIPTION OF EMBODIMENTS

[0021] The embodiments of the present application will be described in detail below with reference to the drawings. It should be understood that the embodiments described herein are only to explain the present application, and are not intended to limit the present application.

[0022] FIG. 2 to FIG. 4 show an aerial work platform, comprising: a first hydraulic system 1, which includes a turntable actuator 11 arranged on a turntable 61, a boom actuator 12 arranged on a boom 62, and a first control valve 13 and a first electric pump set 14 both arranged on the turntable 61; the turntable actuator 11 and the boom actuator 12 are controlled by the first control valve 13, and the first electric pump set 14 supplies oil to the first control valve 13; a second hydraulic system 2, which includes a platform actuator 21 arranged on a work platform 63, a fly jib actuator 22 arranged on a fly jib 64, and a second control valve 23 and a second electric pump set 24 both arranged on the work platform 63; the platform actuator 21 and the fly jib actuator 22 are controlled by the second control valve 23, and the second electric pump set 24 supplies oil to the second control valve 23; a power supply module, which supplies power to the first electric pump set 14 and the second electric pump set 24; and a control module, which communicates with the first control valve 13, the second control valve 23, the first electric pump set 14, and the second electric pump set 24 respectively.

[0023] In the present application, hydraulic systems are set based on the principle of proximity. To be specific, the first hydraulic system 1 is set on the turntable 61 side for hydraulic transmission of the turntable 61 and the boom 62, and the second hydraulic system 2 is set on the work platform 63 side for hydraulic transmission of the work platform 63 and the fly jib 64. In the first hydraulic system 1, the first electric pump set 14, the first control valve 13, the boom actuator 12, and the turntable actuator 11 are mutually connected by pipelines to form an independent hydraulic transmission circuit. In the second hydraulic system 2, the second electric pump set 24, the second control valve 23, the fly jib actuator 22, and the platform actuator 21 are mutually connected by pipelines to form the other 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 actions of the turntable actuator 11, boom actuator 12, platform actuator 21, and fly jib actuator 22 through electrical signals. Compared with the prior art, the first hydraulic system 1 and the second hydraulic system 2 in the present application only need to be connected by cables for power supply and communication. This eliminates long-distance oil supply pipelines, and enables actuators in each hydraulic transmission circuit to be driven by their respective matching nearby electric pump sets and control valves, shortening the oil supply pipelines and reducing the pressure loss of the hydraulic oil. Furthermore, this also avoids slow responses of actuators caused by the increase of hydraulic oil viscosity in the low-temperature environment, thereby effectively addressing the disadvantages associated with the long oil supply pipelines in centralized hydraulic systems.

[0024] In addition, compared with the prior art, the hydraulic transmission circuits of the first hydraulic system 1 and the second hydraulic system 2 are independent of each other and are decoupled for transmission. Therefore, specifications of hydraulic components in each hydraulic transmission circuit can be flexibly configured according to the power requirements of their actuators. This can achieve more precise energy transfer and control, reduce production costs and overall energy consumption of the aerial work platform, and make troubleshooting convenient.

[0025] Specifically, the turntable actuator 11 includes a turntable rotation motor connected to the first control valve 13 by a pipeline. The boom actuator 12 includes a boom luffing cylinder and a telescopic boom cylinder respectively connected to the first control valve 13 by a pipeline. The turntable rotation motor is used to drive the turntable 61 to rotate relative to a chassis 65. The boom luffing cylinder is used to drive the boom 62 to perform luffing relative to the turntable 61, and the telescopic boom cylinder is used to drive the boom 62 to extend or retract. The two cylinders together change the aerial position of the work platform 63 at the top of the boom 62.

[0026] Specifically, the platform actuator 21 includes a platform swing cylinder and a platform leveling cylinder respectively connected to the second control valve 23 by a pipeline. The fly jib actuator 22 includes a fly jib luffing cylinder connected to the second control valve 23 by a pipeline. The platform swing cylinder and the platform leveling cylinder are used to adjust the aerial posture 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, and further adjust the aerial position of the work platform 63.

[0027] Specifically, the power of the first electric pump set 14 is higher than that of the second electric pump set 24, and the displacement of the first electric pump set 14 is larger than that of the second electric pump set 24. Compared with the work platform 63 side, the turntable 61 side bears more weight of the aerial work platform and has a larger load torque. The turntable actuator 11 and the boom actuator 12 bear more load than the platform actuator 21 and the fly jib actuator 22, and naturally require more power and displacement. Therefore, the first electric pump set 14, as the hydraulic source of the first hydraulic system 1, needs to have higher power and larger displacement.

[0028] In some embodiments, the first control valve 13 and the second control valve 23 are both multi-position multi-way electromagnetic control valves, and are electrically connected to the control module for controlling the on and off of different hydraulic circuits. The first electric pump set 14 is connected to the first control valve 13 by a pipeline. The selectable form can be a motor and multiple hydraulic pumps, or multiple motors and a hydraulic pump. The first electric pump set 14 can be an AC motor and is configured to be driven by a motor driver 17 for motor driving and parameter adjustment. The second electric pump set 24 is connected to the second control valve 23 by a pipeline, and the selectable form can be a DC motor and a hydraulic pump.

[0029] Specifically, the first hydraulic system 1 also includes a radiator 15 connected to the hydraulic circuit, and the radiator 15 is used to lower the temperature of the hydraulic oil in the hydraulic circuit. The turntable actuator 11 and the boom actuator 12 bear high load, and the hydraulic oil in their hydraulic circuits heats up quickly. Therefore, setting the radiator 15 is necessary.

[0030] In some embodiments, the radiator 15 is installed on the turntable 61. It is connected to the first control valve 13 by a pipeline and located on the oil return side of its hydraulic circuit.

[0031] In some embodiments, the power supply module includes a main power battery 41 arranged on the chassis 65 or the turntable 61. The positive and negative power supply cables run through the chassis 65, the turntable 61, and the work platform 63 to supply power to electrical devices of the aerial work platform, forming a power supply network. The power supply module does not limit the number of electrical devices loaded if its conditions permit.

[0032] Specifically, the power supply module includes an emergency power battery 42 arranged on the turntable 61. The first hydraulic system 1 also includes a first emergency electric pump set 16 arranged on the turntable 61 to supply oil to the first control valve 13. The emergency power battery 42 supplies power to the first emergency electric pump set 16. For the aerial work platform, the aerial position of its work platform 63 is mainly controlled by the turntable actuator 11 and the boom actuator 12. To ensure the safety of operators, a redundant first emergency electric pump set 16 and the emergency power battery 42 are provided to replace the first electric pump set 14 and the main power battery 41 at a proper time, to ensure that the work platform 63 can still be safely lowered to the ground in case of a failure.

[0033] In some embodiments, the first emergency electric pump set 16 is connected to the first control valve 13 by a pipeline, and communicates with the control module.

[0034] Specifically, the second hydraulic system 2 also includes a second emergency electric pump set 25 and / or an emergency manual pump set 26 that can replace the second electric pump set 24 to supply oil to the second control valve 23. The second emergency electric pump set 25 is powered by the power supply module, and communicates with the control module. A redundant second emergency electric pump set 25 or the emergency manual pump set 26 is provided to ensure that when the second electric pump set 24 fails, the aerial posture of the work platform 63 can still be adjusted to complete the aerial work.

[0035] Specifically, the control module includes a controller 51 arranged on the turntable 61 and a first I / O module 52 arranged on the work platform 63. The controller 51 communicates with the second control valve 23 through the first I / O module 52. The controller 51, the first I / O module 52, the first electric pump set 14, and the second electric pump set 24 form a CAN communication network. The first hydraulic system 1 is located on the turntable 61 side and the second hydraulic system 2 is located on the work platform 63 side. The two hydraulic systems are far apart from each other. Using a CAN communication network can reduce signal interference, simplify connection lines, and also facilitate the connection with other components that have CAN communication capabilities.

[0036] In some embodiments, the controller 51 may directly communicate with the first control valve 13 and the first emergency electric pump set 16 for control. The controller 51 sends signals to the motor driver 17 of the first electric pump set 14 and the DC motor of the second electric pump set 24 through the CAN communication network, to monitor and adjust their motor current, speed, and other parameters. The first I / O module 52 receives the signals sent by the controller 51 through the CAN communication network and converts them into analog outputs to control the second control valve 23.

[0037] As shown in FIG. 2 and FIG. 5, specifically, the aerial work platform also includes: a third hydraulic system 3, which includes a chassis actuator 31 arranged on the chassis 65, a third control valve 32, and a third electric pump set 33. The chassis actuator 31 is controlled by the third control valve 32, and the third electric pump set 33 supplies oil to the third control valve 32.

[0038] Specifically, the power supply module can power the third electric pump set 33, and the control module communicates with the third control valve 32 and the third electric pump set 33 respectively.

[0039] In the present application, the third hydraulic system 3 is provided near the chassis 65 side for hydraulic transmission of the chassis 65. Among them, the third electric pump set 33, the third control valve 32, and the chassis actuator 31 are mutually connected by pipelines to form an independent hydraulic transmission circuit. The third hydraulic system 3 is connected to the power supply network and the CAN communication network through cables. The hydraulic transmission circuits of the first hydraulic system 1, the second hydraulic system 2, and the third hydraulic system 3 are independent of each other, forming an aerial work platform with distributed power.

[0040] Specifically, the chassis actuator 31 includes a chassis floating cylinder and a chassis steering cylinder connected to the third control valve 32 by pipelines. The chassis floating cylinder is used to adjust the posture of the chassis 65. The chassis steering cylinder is used to steer the chassis 65.

[0041] Specifically, the power of the first electric pump set 14 is higher than that of the third electric pump set 33, and the displacement of the first electric pump set 14 is larger than that of the third electric pump set 33.

[0042] In some embodiments, the third control valve 32 is a multi-position multi-way electromagnetic control valve, used to control the on and off of different hydraulic circuits. The third electric pump set 33 is connected to the third control valve 32 by a pipeline, and the selectable form can be a DC motor and a hydraulic pump.

[0043] In some embodiments, the chassis 65 is an electric wheeled chassis, and the main power battery 41 of the power supply module is a power battery mounted on the electric wheeled chassis. The control module also includes a second I / O module 53 arranged 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 set 33 through the CAN communication network, to monitor and adjust its motor current, speed, and other parameters. The second I / O module 53 receives the signals sent by the controller 51 through the CAN communication network and converts them into analog outputs to control the third control valve 32.

[0044] In the description of the present application, it should be understood that the terms "first" and "second" are used merely for illustrative purposes and shall not be construed as indicating or implying relative importance or as implicitly specifying the number of technical features referred to. To this end, the features defined with the terms "first" and "second" may explicitly or implicitly include at least one of the features. In the context of the present application, unless otherwise specifically defined, "multiple" means at least two, for example, two or three.

[0045] In the present application, unless otherwise expressly specified and defined, the terms "mount", "be connected to", "be connected with", "fix", and so forth shall be interpreted in a broad sense. For example, the connection can be fixed connection, detachable connection, integrated connection, mechanical connection, electrical connection, connection capable of communicating with each other, direct connection, indirect connection through intermediate media, connection between two components or interaction between two components, unless otherwise specifically defined. For those of ordinary skill in the art, the specific meaning of the preceding terms in the present application can be understood according to the specific situation.

[0046] In the description of the specification, descriptions with reference to the terms "an embodiment", "some embodiments", "example", "specific example", or "some examples" mean that specific features, structures, materials, or characteristics described in combination with the embodiment or example are contained in at least an embodiment or example of the present application. In the specification, the schematic expressions of the above terms do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. Furthermore, the technicians in this field may combine different embodiments or examples described in the specification and features of different embodiments or examples without contradiction.

[0047] Although the embodiment of the present application has been shown and described above, it can be understood that the above embodiment is exemplary and cannot be understood as a limitation on the present application. The changes, modifications, replacements, and improvements can be made to the above embodiment within the scope of the present application for ordinary persons skilled in the art.

Examples

Embodiment Construction

[0021]The embodiments of the present application will be described in detail below with reference to the drawings. It should be understood that the embodiments described herein are only to explain the present application, and are not intended to limit the present application.

[0022]FIG. 2 to FIG. 4 show an aerial work platform, comprising:

a first hydraulic system 1, which includes a turntable actuator 11 arranged on a turntable 61, a boom actuator 12 arranged on a boom 62, and a first control valve 13 and a first electric pump set 14 both arranged on the turntable 61; the turntable actuator 11 and the boom actuator 12 are controlled by the first control valve 13, and the first electric pump set 14 supplies oil to the first control valve 13; a second hydraulic system 2, which includes a platform actuator 21 arranged on a work platform 63, a fly jib actuator 22 arranged on a fly jib 64, and a second control valve 23 and a second electric pump set 24 both arranged on the work platform...

Claims

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

2. The aerial work platform according to claim 1, wherein the power of the first electric pump set (14) is higher than that of the second electric pump set (24), and the displacement of the first electric pump set (14) is larger than that of the second electric pump set (24).

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

4. The aerial work platform according to claim 1, wherein 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 set (16) arranged on the turntable (61) to supply oil to the first control valve (13), the emergency power battery (42) supplies power to the first emergency electric pump set (16).

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

6. The aerial work platform according to claim 1, wherein the turntable actuator (11) includes a turntable rotation motor connected to the first control valve (13) by a pipeline, the boom actuator (12) includes a boom luffing cylinder and a telescopic boom cylinder respectively connected to the first control valve (13) by a pipeline.

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

8. The aerial work platform according to claim 1, wherein the control module includes a controller (51) arranged on the turntable (61) and a first I / O module (52) arranged on the work platform (63), the controller (51) communicates with the second control valve (23) through the first I / O module (52), and wherein the controller (51), the first I / O module (52), the first electric pump set (14), and the second electric pump set (24) form a CAN communication network.

9. The aerial work platform according to any one of claims 1 to 8, wherein the aerial work platform further includes: a third hydraulic system (3), which includes a chassis actuator (31) arranged on the chassis (65), a third control valve (32), and a third electric pump set (33), wherein the chassis actuator (31) is controlled by the third control valve (32), and the third electric pump set (33) supplies oil to the third control valve (32), wherein the power supply module supplies power to the third electric pump set (33), and the control module communicates with the third control valve (32) and the third electric pump set (33) respectively.

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

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