A hydraulic compensation system, method and apparatus for a knuckle boom aerial platform

Abstract

This invention discloses a hydraulic compensation system, method, and device for an articulated boom lift. The hydraulic compensation system includes a boom luffing cylinder, a hydraulic compensation valve assembly, a hydraulic drive control valve assembly, an inlet pipeline, an outlet pipeline, a first pressure sensor, a second pressure sensor, a rodless chamber pipeline, and a rod chamber pipeline. The boom luffing cylinder includes a rodless chamber and a rod chamber. The method includes: acquiring the state of the boom luffing cylinder in real time, acquiring a first pressure value of the rodless chamber based on the first pressure sensor, and acquiring a second pressure value of the rod chamber based on the second pressure sensor; and controlling the hydraulic compensation valve assembly and the hydraulic drive control valve assembly to perform hydraulic compensation on the rodless chamber or the rod chamber based on the first pressure value, the second pressure value, and the current state of the boom luffing cylinder. This solution can solve the boom swaying caused by changes in the state of the boom luffing cylinder, improving the stability of the articulated boom lift and the safety of the operators.

Description

Technical Field

[0001] This invention relates to the field of hydraulic compensation technology, and in particular to a hydraulic compensation system, method and equipment for an articulated boom lift. Background Technology

[0002] Articulated boom lifts are aerial work platforms used in construction, equipment maintenance, municipal maintenance, and other scenarios. They can transport workers and tools to designated high-altitude locations to complete high-altitude installation, inspection, and maintenance operations. The articulated boom lift uses the extension and retraction of the boom's hydraulic cylinders to drive changes in the boom's posture, thereby adjusting the height and position of the work platform.

[0003] Because the boom luffing cylinder of the articulated boom aerial work platform is in a compressed or extended state for a long time, air may be released from the oil and oil may leak. When the boom luffing cylinder switches rapidly between the compressed and extended states, it will cause a sudden change in the pressure inside the chamber, causing the boom and the work platform to shake violently, which poses a huge safety hazard. Summary of the Invention

[0004] This invention provides a hydraulic compensation system, method, and device for articulated boom aerial work platforms, which can solve the boom swaying caused by changes in the state of the boom luffing cylinder, thereby improving the stability of the articulated boom aerial work platform and the safety of the operators.

[0005] In a first aspect, the present invention provides a hydraulic compensation method for an articulated boom lift, which is executed using the hydraulic compensation system of the articulated boom lift. The hydraulic compensation system of the articulated boom lift includes: a boom luffing cylinder, a hydraulic compensation valve group, a hydraulic drive control valve group, an inlet pipe, an outlet pipe, a first pressure sensor, a second pressure sensor, a rodless chamber pipe, and a rod chamber pipe. The boom luffing cylinder includes a rodless chamber and a rod chamber. The first end of the rodless chamber pipe is connected to the rodless chamber, and the second end of the rodless chamber pipe is connected to... The hydraulic drive control valve assembly is connected to the inlet and outlet oil lines; the first end of the rod-side pipeline is connected to the rod-side chamber; the second end of the rod-side pipeline is connected to the inlet and outlet oil lines via the hydraulic drive control valve assembly; the hydraulic compensation valve assembly is disposed in the rodless and rod-side pipelines; the first pressure sensor is disposed at the first end of the rodless pipeline; the second pressure sensor is disposed at the first end of the rod-side pipeline; the hydraulic compensation method of the articulated boom aerial work platform includes:

[0006] The status of the articulated boom variable luffing cylinder is acquired in real time, and the first pressure value of the rodless chamber is acquired based on the first pressure sensor and the second pressure value of the rod chamber is acquired based on the second pressure sensor.

[0007] Based on the first pressure value, the second pressure value, and the current state of the boom luffing cylinder, the hydraulic compensation valve group and the hydraulic drive control valve group are controlled to perform hydraulic compensation on the rodless chamber or the rod chamber.

[0008] Optionally, based on the first pressure value, the second pressure value, and the current state of the boom luffing cylinder, the hydraulic compensation valve group and the hydraulic drive control valve group are controlled to perform hydraulic compensation on the rodless chamber or the rod chamber, including:

[0009] When the current state of the articulated boom luffing cylinder is the tension state, it is determined whether the first pressure value is less than the first pressure threshold.

[0010] If so, the hydraulic compensation valve group is controlled to open the oil flow passage of the rodless chamber pipeline, and the hydraulic drive control valve group is controlled to open the rodless chamber pipeline and the oil inlet pipeline, so that the oil in the oil tank enters the rodless chamber through the oil inlet pipeline and the rodless chamber pipeline.

[0011] Optionally, based on the first pressure value, the second pressure value, and the current state of the boom luffing cylinder, the hydraulic compensation valve group and the hydraulic drive control valve group are controlled to perform hydraulic compensation on the rodless chamber or the rod chamber, including:

[0012] When the current state of the articulated boom luffing cylinder is the compression state, it is determined whether the second pressure value is less than the second pressure threshold.

[0013] If so, the hydraulic compensation valve group is controlled to open the oil flow passage of the rod chamber pipeline, and the hydraulic drive control valve group is controlled to open the rod chamber pipeline and the oil inlet pipeline, so that the oil in the oil tank enters the rod chamber through the rod chamber pipeline.

[0014] Optionally, the hydraulic compensation valve assembly includes: a first balance valve, a second balance valve, a first check valve, and a second check valve; the first balance valve and the first check valve are connected in series in the rodless chamber pipeline; the second balance valve and the second check valve are connected in series in the rod chamber pipeline.

[0015] Controlling the hydraulic compensation valve assembly to open the oil flow passage of the rodless chamber pipeline includes:

[0016] Control the first balance valve and the first check valve to open, so as to open the oil flow passage of the rodless chamber pipeline.

[0017] Optionally, the hydraulic compensation valve assembly includes: a first balance valve, a second balance valve, a first check valve, and a second check valve; the first balance valve and the first check valve are connected in series in the rodless chamber pipeline; the second balance valve and the second check valve are connected in series in the rod chamber pipeline.

[0018] Controlling the hydraulic compensation valve assembly to open the oil flow passage of the rod chamber pipeline includes:

[0019] Control the second balance valve and the second check valve to open, so as to open the oil flow passage of the rod chamber pipeline.

[0020] Optionally, after the oil in the tank enters the rodless chamber through the oil inlet pipe and the rodless chamber pipe, it further includes:

[0021] Determine whether the first pressure value is greater than the third pressure threshold;

[0022] If so, the first balancing valve and the first check valve are closed to disconnect the oil flow passage of the rodless chamber pipeline.

[0023] Optionally, after the oil in the tank enters the rod chamber through the oil inlet pipe and the rod chamber pipe, it further includes:

[0024] Determine whether the second pressure value is greater than the fourth pressure threshold;

[0025] If so, the second balance valve and the second check valve are closed to disconnect the oil flow passage of the rod chamber pipeline.

[0026] Optionally, the hydraulic compensation valve assembly further includes: a first relief valve and a second relief valve; the first relief valve and the first check valve are connected in parallel in the rodless chamber pipeline; the second relief valve and the second check valve are connected in parallel in the rod chamber pipeline; the hydraulic compensation method of the articulated boom lift further includes:

[0027] The cavity states of the rodless cavity and the rod cavity are acquired in real time;

[0028] When the rodless chamber becomes larger and the rod chamber becomes smaller, the first balance valve and the first check valve are opened to allow oil in the tank to enter the rodless chamber through the inlet pipe and the rodless chamber pipe, and the second balance valve and the second overflow valve are opened to allow oil in the rod chamber to enter the tank through the rod chamber pipe and the outlet pipe.

[0029] When the rodless chamber becomes smaller and the rod chamber becomes larger, the second balance valve and the second check valve are opened to allow the oil in the tank to enter the rod chamber through the inlet pipe and the rod chamber pipe, and the first balance valve and the first overflow valve are opened to allow the oil in the rodless chamber to enter the tank through the rodless chamber pipe and the outlet pipe.

[0030] Secondly, the present invention also provides a hydraulic compensation system for an articulated boom aerial work platform, comprising: an articulated boom luffing cylinder, a hydraulic compensation valve group, a hydraulic drive control valve group, an oil inlet pipeline, an oil outlet pipeline, a first pressure sensor, a second pressure sensor, a rodless chamber pipeline, and a rod chamber pipeline.

[0031] The articulated boom luffing cylinder includes a rodless chamber and a rod chamber. The first end of the rodless chamber pipeline is connected to the rodless chamber, and the second end of the rodless chamber pipeline is connected to the oil inlet pipeline and the oil outlet pipeline through the hydraulic drive control valve group. The first end of the rod chamber pipeline is connected to the rod chamber, and the second end of the rod chamber pipeline is connected to the oil inlet pipeline and the oil outlet pipeline through the hydraulic drive control valve group.

[0032] The first end of the oil inlet pipe is connected to the rodless chamber pipe and the rod chamber pipe through the hydraulic drive control valve group, and the second end of the oil inlet pipe is connected to the oil tank; the first end of the oil outlet pipe is connected to the rodless chamber pipe and the rod chamber pipe through the hydraulic drive control valve group, and the second end of the oil outlet pipe is connected to the oil tank.

[0033] The hydraulic compensation valve assembly is disposed in the rodless cavity pipeline and the rod cavity pipeline; the hydraulic compensation valve assembly is used to control the opening or closing of the rodless cavity pipeline and the rod cavity pipeline;

[0034] The hydraulic drive control valve group is disposed in the oil inlet pipe and the oil outlet pipe; the hydraulic drive control valve group is used to control the opening or closing of the oil inlet pipe and the oil outlet pipe;

[0035] The first pressure sensor is disposed at the first end of the rodless cavity pipeline, and the second pressure sensor is disposed at the first end of the rod cavity pipeline; the first pressure sensor is used to detect the pressure value of the rodless cavity, and the second pressure sensor is used to detect the pressure value of the rod cavity;

[0036] The hydraulic compensation system of the articulated boom lift also includes a controller, which is connected to the first pressure sensor, the second pressure sensor, the hydraulic compensation valve group and the hydraulic drive control valve group respectively. The controller is used to execute the hydraulic compensation method of the articulated boom lift described in the first aspect.

[0037] Optionally, the hydraulic compensation valve assembly includes: a first balance valve, a second balance valve, a first check valve, a second check valve, a first relief valve, and a second relief valve;

[0038] The first balance valve and the first relief valve are connected in series in the rodless chamber pipeline, and the first check valve and the first relief valve are connected in parallel in the rodless chamber pipeline; the first balance valve is used to lock the oil in the rodless chamber to maintain the pressure in the rodless chamber, the first check valve is used to allow the oil in the oil tank to enter the rodless chamber unidirectionally through the hydraulic drive control valve group and the rodless chamber pipeline when it is turned on, and the first relief valve is used to allow the oil in the rodless chamber to enter the oil tank through the rodless chamber pipeline and the hydraulic drive control valve group when it is turned on;

[0039] The second balance valve and the second relief valve are connected in series in the rod chamber pipeline, and the second check valve and the second relief valve are connected in parallel in the rod chamber pipeline. The second balance valve is used to lock the oil in the rod chamber to maintain the pressure in the rod chamber. The second check valve is used to allow the oil in the oil tank to enter the rod chamber in one direction through the hydraulic drive control valve group and the rod chamber pipeline when it is turned on. The second relief valve is used to allow the oil in the rod chamber to enter the oil tank through the rod chamber pipeline and the hydraulic drive control valve group when it is turned on.

[0040] Optionally, the hydraulic compensation system of the articulated boom lift also includes: a third relief valve, a functional pump, and a motor;

[0041] The functional pump is installed in the oil inlet pipe, and the motor is connected to the functional pump; the motor is used to drive the functional pump to rotate so that the functional pump draws out the oil from the oil tank.

[0042] The first end of the third relief valve is connected to the oil inlet pipe, and the second end of the third relief valve is connected to the oil outlet pipe; the third relief valve is used to limit the maximum pressure of the hydraulic compensation system of the articulated boom aerial work platform.

[0043] Thirdly, the present invention also provides an aerial work platform, including a turntable, a folding boom, a main boom, a main boom luffing cylinder, a working platform, and a hydraulic compensation system for the articulated boom aerial work platform described in the second aspect.

[0044] The turntable, the folding boom, the main boom, and the working platform are connected in sequence. The folding boom luffing cylinder is connected between the turntable and the folding boom, and the main boom luffing cylinder is connected between the main boom and the folding boom.

[0045] The technical solution of this invention, by acquiring the state of the boom luffing cylinder in real time, and acquiring the first pressure value of the rodless chamber based on the first pressure sensor and the second pressure value of the rod chamber based on the second pressure sensor, and controlling the hydraulic compensation valve group and the hydraulic drive control valve group to perform hydraulic compensation on the rodless chamber or the rod chamber according to the first pressure value, the second pressure value and the current state of the boom luffing cylinder, can solve the boom swaying caused by the change of the boom luffing cylinder state, and improve the stability of the articulated boom aerial work platform and the safety of the operators. Attached Figure Description

[0046] Figure 1 This is a schematic diagram of the hydraulic compensation system of a boom lift aerial work platform provided in an embodiment of the present invention;

[0047] Figure 2 This is a structural schematic diagram of an aerial work platform provided in an embodiment of the present invention;

[0048] Figure 3 This is a flowchart illustrating a hydraulic compensation method for an articulated boom aerial work platform according to Embodiment 2 of the present invention.

[0049] Figure 4 This is a schematic flowchart of a hydraulic compensation method for an articulated boom aerial work platform provided in Embodiment 3 of the present invention;

[0050] Figure 5 This is a flowchart illustrating a hydraulic compensation method for an articulated boom aerial work platform according to Embodiment 4 of the present invention.

[0051] Figure 6 This is a flowchart illustrating a hydraulic compensation method for an articulated boom lift provided in Embodiment 5 of the present invention.

[0052] Explanation of reference numerals in the attached drawings: 10-Folding boom luffing cylinder; 11-Rodless chamber; 12-Rod chamber; 20-Hydraulic compensation valve assembly; 21-First balance valve; 22-Second balance valve; 23-First check valve; 24-Second check valve; 25-First relief valve; 26-Second relief valve; 30-First pressure sensor; 40-Second pressure sensor; 50-Rodless chamber pipeline; 60-Rod chamber pipeline; 70-Oil tank; 81-Turntable; 82-Folding boom; 83-Main boom; 84-Main boom luffing cylinder; 85-Working platform; 90-Hydraulic drive control valve assembly; 100-Inlet pipeline; 110-Outlet pipeline; 120-Third relief valve; 130-Function pump; 140-Motor. Detailed Implementation

[0053] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0054] The terminology used in the embodiments of this invention is for the purpose of describing specific embodiments only and is not intended to limit the invention. It should be noted that directional terms such as "upper," "lower," "left," and "right" described in the embodiments of this invention are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this invention. Furthermore, in the context, it should be understood that when referring to an element being formed "on" or "below" another element, it can be formed not only directly on or below the other element, but also indirectly on or below it through intermediate elements. The terms "first," "second," etc., are used for descriptive purposes only and do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0055] The term "comprising" and its variations as used in this invention are open-ended, meaning "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment".

[0056] It should be noted that the concepts of "first" and "second" mentioned in this invention are only used to distinguish the corresponding contents and are not used to limit the order or interdependence.

[0057] It should be noted that the terms "a" and "a plurality of" used in this invention are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0058] Example 1

[0059] Figure 1 This is a schematic diagram of the hydraulic compensation system of a boom lift aerial work platform provided in an embodiment of the present invention, as shown below. Figure 1As shown, the hydraulic compensation system of the articulated boom aerial work platform includes: a boom luffing cylinder 10, a hydraulic compensation valve assembly 20, a hydraulic drive control valve assembly 90, an oil inlet pipe 100, an oil outlet pipe 110, a first pressure sensor 30, a second pressure sensor 40, a rodless chamber pipe 50, and a rod chamber pipe 60; the boom luffing cylinder 10 includes a rodless chamber 11 and a rod chamber 12, the first end of the rodless chamber pipe 50 is connected to the rodless chamber 11, and the second end of the rodless chamber pipe 50 is connected to the oil inlet pipe 100 through the hydraulic drive control valve assembly 90. The rod chamber pipeline 60 is connected to the oil outlet pipeline 110. The first end of the rod chamber pipeline 60 is connected to the rod chamber 12, and the second end of the rod chamber pipeline 60 is connected to the oil inlet pipeline 100 and the oil outlet pipeline 110 via the hydraulically driven control valve assembly 90. The first end of the oil inlet pipeline 100 is connected to the rodless chamber pipeline 50 and the rod chamber pipeline 60 via the hydraulically driven control valve assembly 90, and the second end of the oil inlet pipeline 100 is connected to the oil tank 70. The first end of the oil outlet pipeline 110 is connected to the rodless chamber pipeline 50 and the rod chamber pipeline 60 via the hydraulically driven control valve assembly 90. The second end of the oil line 110 is connected to the oil tank 70; the hydraulic compensation valve assembly 20 is installed in the rodless chamber line 50 and the rod chamber line 60; the hydraulic compensation valve assembly 20 is used to control the opening or closing of the rodless chamber line 50 and the rod chamber line 60; the hydraulic drive control valve assembly 90 is installed in the oil inlet line 100 and the oil outlet line 110; the hydraulic drive control valve assembly 90 is used to control the opening or closing of the oil inlet line 100 and the oil outlet line 110; the first pressure sensor 30 is installed at the first end of the rodless chamber line 50, and the second pressure sensor... Device 40 is disposed at the first end of rod chamber pipeline 60; first pressure sensor 30 is used to detect the pressure value of rodless chamber 11, and second pressure sensor 40 is used to detect the pressure value of rod chamber 12; the hydraulic compensation system of the articulated boom aerial work platform also includes a controller (not shown in the figure), the controller is connected to the first pressure sensor 30, the second pressure sensor 40, the hydraulic compensation valve group 20 and the hydraulic drive control valve group 90 respectively, and the controller is used to execute the hydraulic compensation method of the articulated boom aerial work platform provided in any embodiment of the present invention.

[0060] The articulated boom luffing cylinder 10 is a hydraulic cylinder that drives the articulated boom to complete the lifting or lowering luffing action through the relative reciprocating linear motion of the cylinder body and the piston assembly, so as to adjust the working height or amplitude of the articulated boom aerial work platform. The articulated boom luffing cylinder 10 is divided into a rodless chamber 11 and a rod chamber 12 by the piston assembly. The side chamber through which no piston rod passes is the rodless chamber 11, and the side chamber through which the piston rod passes is the rod chamber 12. The first end of the rodless cavity line 50 is connected to the rodless cavity 11, and the second end of the rodless cavity line 50 is connected to the oil inlet line 100 and the oil outlet line 110 through the hydraulically driven control valve group 90. The rodless cavity line 50 can provide a replenishment or return path for the rodless cavity 11. The first end of the rod cavity line 60 is connected to the rod cavity 12, and the second end of the rod cavity line 60 is connected to the oil inlet line 100 and the oil outlet line 110 through the hydraulically driven control valve group 90. The rod cavity line 60 can provide a replenishment or return path for the rod cavity 12. Both the rodless cavity pipeline 50 and the rod cavity pipeline 60 are equipped with hydraulic compensation valve assemblies 20. By controlling the opening or closing of each valve element in the hydraulic compensation valve assembly 20, the rodless cavity pipeline 50 and the rod cavity pipeline 60 can be opened or closed. The hydraulic drive control valve assembly 90 is installed in the oil inlet pipeline 100 and the oil outlet pipeline 110. The hydraulic drive control valve assembly 90 is used to control the opening or closing of the oil inlet pipeline 100 and the oil outlet pipeline 110, thereby guiding the oil to flow in a directional manner between the boom luffing cylinder 10 and the oil tank 70.

[0061] In an alternative embodiment, reference continues. Figure 1 The hydraulic compensation valve assembly 20 includes: a first balance valve 21, a second balance valve 22, a first check valve 23, a second check valve 24, a first relief valve 25, and a second relief valve 26. The first balance valve 21 and the first relief valve 25 are connected in series in the rodless chamber pipeline 50, and the first check valve 23 and the first relief valve 25 are connected in parallel in the rodless chamber pipeline 50. The first balance valve 21 is used to lock the oil in the rodless chamber 11 to maintain the pressure of the rodless chamber 11. The first check valve 23 is used to allow the oil in the oil tank 70 to enter the rodless chamber 11 in one direction through the hydraulic drive control valve assembly 90 and the rodless chamber pipeline 50 when the valve is turned on. The first relief valve 25 is used to allow the oil in the rodless chamber 11 to enter the rodless chamber 11 in one direction when the valve is turned on. The oil enters the oil tank 70 through the rodless chamber pipeline 50 and the hydraulically driven control valve group 90; the second balance valve 22 and the second relief valve 26 are connected in series in the rod chamber pipeline 60, and the second check valve 24 and the second relief valve 26 are connected in parallel in the rod chamber pipeline 60; the second balance valve 22 is used to lock the oil in the rod chamber 12 to maintain the pressure of the rod chamber 12, the second check valve 24 is used to allow the oil in the oil tank 70 to enter the rod chamber 12 in one direction through the hydraulically driven control valve group 90 and the rod chamber pipeline 60 when it is turned on, and the second relief valve 26 is used to allow the oil in the rod chamber 12 to enter the oil tank 70 through the rod chamber pipeline 60 and the hydraulically driven control valve group 90 when it is turned on.

[0062] The first balancing valve 21 and the first overflow valve 25 are connected in series in the rodless chamber pipeline 50, and the first check valve 23 and the first overflow valve 25 are connected in parallel in the rodless chamber pipeline 50. When the sizes of the rodless chamber 11 and the rod chamber 12 of the boom luffing cylinder 10 do not change, the first balancing valve 21 remains closed, locking the oil in the rodless chamber 11 within it to prevent leakage and backflow into the oil tank 70, thereby maintaining the pressure in the rodless chamber 11 and preventing the boom luffing cylinder 10 from settling due to oil leakage. When it is necessary to adjust the pressure in the rodless chamber 11... When replenishing or returning oil, the first balance valve 21 is opened to allow the oil to flow directionally between the rodless chamber 11 and the oil tank 70. When replenishing oil to the rodless chamber 11, the first check valve 23 and the first balance valve 21 are opened simultaneously to allow the oil in the oil tank 70 to enter the rodless chamber 11 unidirectionally through the hydraulic drive control valve group 90 and the rodless chamber pipeline 50. When returning oil to the rodless chamber 11, the first relief valve 25 and the first balance valve 21 are opened simultaneously to allow the oil in the rodless chamber 11 to enter the oil tank 70 through the rodless chamber pipeline 50 and the hydraulic drive control valve group 90.

[0063] The second balancing valve 22 and the second overflow valve 26 are connected in series in the rod chamber pipeline 60, and the second check valve 24 and the second overflow valve 26 are connected in parallel in the rod chamber pipeline 60. When the sizes of the rodless chamber 11 and the rod chamber 12 of the boom luffing cylinder 10 do not change, the second balancing valve 22 remains closed, locking the oil in the rod chamber 12 within the rod chamber 12 to prevent oil leakage and backflow into the oil tank 70, thereby maintaining the pressure in the rod chamber 12 and preventing the boom luffing cylinder 10 from settling due to oil leakage. When it is necessary to adjust the rod chamber 12... When replenishing or returning oil, the second balance valve 22 is activated to allow the oil to flow directionally between the rod chamber 12 and the oil tank 70. When replenishing oil to the rod chamber 12, the second check valve 24 and the second balance valve 22 are activated simultaneously to allow the oil in the oil tank 70 to enter the rod chamber 12 unidirectionally through the rod chamber pipeline 60 of the hydraulic drive control valve group 90. When returning oil to the rod chamber 12, the second overflow valve 26 and the second balance valve 22 are activated simultaneously to allow the oil in the rod chamber 12 to enter the oil tank 70 through the rod chamber pipeline 60 and the hydraulic drive control valve group 90.

[0064] The first pressure sensor 30 is used to detect the pressure value of the rodless chamber 11, and the second pressure sensor 40 is used to detect the pressure value of the rod chamber 12. By detecting the pressure values ​​of the rodless chamber 11 and the rod chamber 12 in real time, the oil volume in the rodless chamber 11 and the rod chamber 12 is reflected, providing a basis for the hydraulic compensation valve group 20 to perform hydraulic compensation on the rodless chamber 11 or the rod chamber 12.

[0065] In an optional embodiment, the hydraulic compensation system of the articulated boom lift further includes a third relief valve 120, a functional pump 130, and a motor 140; the functional pump 130 is disposed in the oil inlet line 100, and the motor 140 is connected to the functional pump 130; the motor 140 is used to drive the functional pump 130 to rotate, so that the functional pump 130 draws oil from the oil tank 70; the first end of the third relief valve 120 is connected to the oil inlet line 100, and the second end of the third relief valve 120 is connected to the oil outlet line 110; the third relief valve 120 is used to limit the maximum pressure of the hydraulic compensation system of the articulated boom lift.

[0066] The hydraulic drive control valve group 90 includes multiple conduction states. When the hydraulic drive control valve group 90 is switched to the left, the motor 140 drives the functional pump 130 to rotate, so that the oil in the oil tank 70 enters the rodless chamber 11 through the inlet pipe 100 and the rodless chamber pipe 50, and the oil in the rod chamber 12 enters the oil tank 70 through the rod chamber pipe 60 and the outlet pipe 110. When the hydraulic drive control valve group 90 is switched to the right, the motor 140 drives the functional pump 130 to rotate, so that the oil in the oil tank 70 enters the rod chamber 12 through the inlet pipe 100 and the rod chamber pipe 60, and the oil in the rodless chamber 11 enters the oil tank 70 through the rodless chamber pipe 50 and the outlet pipe 110.

[0067] Understandably, the articulated boom luffing cylinder 10 is commonly used in aerial work platforms. Figure 2 This is a structural schematic diagram of an aerial work platform provided in an embodiment of the present invention, as shown below. Figure 2 As shown, the aerial work platform includes: a turntable 81, a folding boom 82, a main boom 83, a main boom luffing cylinder 84, a working platform 85, and a hydraulic compensation system for the articulated boom aerial work platform; the turntable 81, the folding boom 82, the main boom 83, and the working platform 85 are connected in sequence, the folding boom luffing cylinder 10 is connected between the turntable 81 and the folding boom 82, and the main boom luffing cylinder 84 is connected between the main boom 83 and the folding boom 82.

[0068] Among them, aerial work platforms are equipment that can smoothly lift workers to a designated high-altitude position to complete high-altitude work tasks such as inspection, installation, and maintenance. The turntable 81 is the base of the aerial work platform, which can rotate 360° around the Y-axis, thereby driving the articulated boom and the working platform 85 to achieve horizontal orientation adjustment. The lower end of the articulated boom 82 is connected to the turntable 81, and the upper end is connected to the main boom 83. The articulated boom luffing cylinder 10 is connected between the turntable 81 and the articulated boom 82. The extension and retraction movement of the articulated boom luffing cylinder 10 can drive the articulated boom 82 to lift or lower. The lower end of the main boom 83 is connected to the articulated boom 82, and the upper end is connected to the working platform 85. The main boom 83 is used to cooperate with the articulated boom 82 to expand the working range of the aerial work platform. The main boom luffing cylinder 84 is connected between the main boom 83 and the articulated boom 82. The extension and retraction movement of the main boom luffing cylinder 84 can realize the change of the rotation angle θ of the main boom 83. The working platform 85 is connected to the main boom 83. The operator can stand on the working platform 85 to reach different aerial work positions and complete the aerial work task.

[0069] Specifically, the aerial work platform uses the extension and retraction movement of the boom luffing cylinder 10 to change the posture of the boom 82, which in turn drives the extension and retraction of the main boom luffing cylinder 84, thereby driving the main boom 83 to complete the luffing adjustment, ultimately achieving the adjustment of the position and height of the work platform 85. For example, when the piston rod of the boom luffing cylinder 10 is fully extended, the boom 82 is raised to the top, and simultaneously, the piston rod of the main boom luffing cylinder 84 is fully extended, raising the main boom 83 to the top. At this time, the overall center of gravity of the aerial work platform is at position O1, which is located to the left of the Y-axis of the turntable 81. The boom luffing cylinder 10 supports the weight of the boom and is in a compressed state. The piston of the boom luffing cylinder 10 applies axial compressive force to the oil in the rodless chamber 11, and the angle α between the main boom 83 and the X-axis of the turntable 81 is greater than θ. If the height of the main boom 83 is lowered so that the angle between the main boom 83 and the X-axis of the turntable 81 is less than or equal to θ, the center of gravity of the entire aerial work platform is at position O2. Position O2 is located to the right of the Y-axis of the turntable 81. At this time, the boom luffing cylinder 10 does not support the weight of the boom and is in a stretched state. The piston of the boom luffing cylinder 10 applies axial compression force to the oil in the rod chamber 12. When the boom luffing cylinder 10 is in a compressed state for a long time, the rodless chamber 11 is continuously subjected to high pressure, causing the air dissolved in the oil in the rodless chamber 11 to be released from the oil. At the same time, the long-term high pressure causes the performance of the seal between the piston and the boom luffing cylinder 10 to deteriorate, and the oil leaks from the rodless chamber 11 into the oil tank 70, which in turn causes the boom luffing cylinder 10 to be further compressed. Similarly, when the boom luffing cylinder 10 is in a stretched state for a long time, the rod chamber 12 is continuously subjected to high pressure, causing the air dissolved in the oil in the rod chamber 12 to be released from the oil. At the same time, the long-term high pressure causes the performance of the seal between the piston and the boom luffing cylinder 10 to deteriorate, and the oil leaks from the rod chamber 12 into the oil tank 70, which in turn causes the boom luffing cylinder 10 to be further stretched. Therefore, if the boom luffing cylinder 10 rapidly switches from a compression state to a tension state, it will be instantly stretched a certain distance; if it rapidly switches from a tension state to a compression state, it will be instantly compressed a certain distance. Both scenarios will cause severe swaying of the boom, leading to significant vibration of the work platform 85 and affecting the safety of the operators. Therefore, by acquiring the pressure value of the rodless chamber 11 in real time through the first pressure sensor 30 and the pressure value of the rod chamber 12 in real time through the second pressure sensor 40, real-time hydraulic compensation is applied to the boom luffing cylinder 10 to prevent boom swaying and improve operator safety.

[0070] This embodiment uses a first pressure sensor to acquire the pressure value of the rodless chamber in real time, and a second pressure sensor to acquire the pressure value of the rod chamber in real time. The controller can control the hydraulic compensation valve group and the hydraulic drive control valve group to perform hydraulic compensation on the rodless or rod chamber according to the pressure value, thereby achieving precise oil replenishment to the boom luffing cylinder. This avoids the swaying of the boom and the working platform caused by the switching of the boom luffing cylinder state, and improves the stability of the articulated boom aerial work platform and the safety of the operators.

[0071] It is understood that the controller in the hydraulic compensation system of the articulated boom aerial work platform provided in the embodiments of the present invention can be used to execute the hydraulic compensation method of the articulated boom aerial work platform provided in any embodiment of the present invention. Therefore, the controller in the hydraulic compensation system of the articulated boom aerial work platform has the relevant functional structure for executing the hydraulic compensation method of the articulated boom aerial work platform provided in any embodiment of the present invention, and can achieve the same beneficial effects as the hydraulic compensation method of the articulated boom aerial work platform provided in the embodiments of the present invention. For details, please refer to the following description.

[0072] Example 2

[0073] Figure 3 This is a flowchart illustrating a hydraulic compensation method for an articulated boom lift provided in Embodiment 2 of the present invention. This embodiment can be used for hydraulic compensation of an articulated boom lift. The method can be executed by the controller of the hydraulic compensation system of the articulated boom lift. This hydraulic compensation method for the articulated boom lift can be implemented by software and / or hardware, such as... Figure 3 As shown, the hydraulic compensation method for articulated boom lifts includes:

[0074] S110, real-time acquisition of the status of the articulated boom variable boom cylinder, and acquisition of the first pressure value of the rodless chamber based on the first pressure sensor and the second pressure value of the rod chamber based on the second pressure sensor.

[0075] The boom luffing cylinder operates in two states: compression and extension. In the compression state, the cylinder supports the weight of the boom, and its piston applies axial compressive force to the hydraulic fluid in the rodless chamber. In the extension state, the cylinder does not support the weight of the boom, and its piston applies axial compressive force to the hydraulic fluid in the rod chamber. The first pressure value reflects the hydraulic pressure inside the rodless chamber, and the second pressure value reflects the hydraulic pressure inside the rod chamber.

[0076] Specifically, the status of the boom luffing cylinder can be obtained through the controller of the hydraulic compensation system of the boom lift. By obtaining the first pressure value of the rodless chamber and the second pressure value of the rod chamber, a basis for determining whether to perform hydraulic compensation on the boom luffing cylinder can be provided.

[0077] S120. Based on the first pressure value, the second pressure value, and the current state of the boom luffing cylinder, control the hydraulic compensation valve group and the hydraulic drive control valve group to perform hydraulic compensation on the rodless chamber or the rod chamber.

[0078] Specifically, if the first or second pressure value is abnormal, and based on the current state of the boom luffing cylinder, it can be determined that air has been released from the hydraulic fluid or there is internal leakage in the boom luffing cylinder. In this case, the hydraulic compensation valve group and the hydraulic drive control valve group will be controlled to perform hydraulic compensation on the rodless or rod chamber to maintain the pressure in the corresponding chamber, prevent the work platform from shaking, and improve the safety of the operators.

[0079] This embodiment acquires the real-time status of the boom luffing cylinder, obtains the first pressure value of the rodless chamber based on the first pressure sensor and the second pressure value of the rod chamber based on the second pressure sensor, and controls the hydraulic compensation valve group and the hydraulic drive control valve group to perform hydraulic compensation on the rodless chamber or the rod chamber according to the first pressure value, the second pressure value and the current status of the boom luffing cylinder. This can solve the boom swaying caused by the change of the boom luffing cylinder status, and improve the stability of the articulated boom aerial work platform and the safety of the operators.

[0080] Example 3

[0081] Figure 4 This is a flowchart illustrating a hydraulic compensation method for a boom lift aerial work platform according to Embodiment 3 of the present invention. Based on the above embodiments, this embodiment provides a detailed description of the hydraulic compensation method, such as... Figure 4 As shown, the hydraulic compensation method for this articulated boom aerial work platform includes:

[0082] S210, real-time acquisition of the status of the articulated boom variable boom cylinder, and acquisition of the first pressure value of the rodless chamber based on the first pressure sensor and the second pressure value of the rod chamber based on the second pressure sensor.

[0083] S220. When the current state of the boom luffing cylinder is the tension state, determine whether the first pressure value is less than the first pressure threshold; if so, execute S240.

[0084] The first pressure threshold is the preset minimum pressure value of the rodless chamber of the boom luffing cylinder, which can be set according to the performance of the first relief valve.

[0085] Specifically, when the boom luffing cylinder is in the extended state, the piston of the boom luffing cylinder applies axial compression force to the oil in the rod chamber. Air may be released or internal leakage may occur in the rod chamber. Therefore, by judging whether the first pressure value of the rodless chamber is less than the first pressure threshold, it is determined whether hydraulic compensation of the rodless chamber is required.

[0086] S230. When the current state of the boom luffing cylinder is compression, determine whether the second pressure value is less than the second pressure threshold; if so, execute S250.

[0087] The second pressure threshold is the preset minimum pressure value of the rod chamber of the boom luffing cylinder, which can be set according to the performance of the second relief valve.

[0088] Specifically, when the boom luffing cylinder is in a compressed state, the piston of the boom luffing cylinder applies axial compressive force to the oil in the rodless chamber. Air may be released or internal leakage may occur in the oil in the rodless chamber. Therefore, by judging whether the second pressure value of the rod chamber is less than the second pressure threshold, it is determined whether hydraulic compensation of the rod chamber is required.

[0089] S240, control the hydraulic compensation valve group to open the oil flow passage of the rodless chamber pipeline, and control the hydraulic drive control valve group to open the rodless chamber pipeline and the oil inlet pipeline, so that the oil in the oil tank enters the rodless chamber through the oil inlet pipeline and the rodless chamber pipeline.

[0090] Specifically, when the boom luffing cylinder is in the extended state and the first pressure value is less than the first pressure threshold, it indicates that the actual pressure in the rodless chamber is less than the minimum pressure preset value. This indicates that air has been released or there is internal leakage in the oil in the rod chamber. Therefore, by controlling the hydraulic compensation valve group to open the oil flow passage in the rodless chamber pipeline and controlling the hydraulic drive control valve group to open the rodless chamber pipeline and the oil inlet pipeline, the oil in the tank can enter the rodless chamber through the oil inlet pipeline and the rodless chamber pipeline to increase the pressure in the rodless chamber and prevent boom swaying caused by the change in the state of the boom luffing cylinder.

[0091] In an optional embodiment, controlling the hydraulic compensation valve assembly to open the oil flow passage of the rodless chamber pipeline includes: controlling the first balance valve and the first check valve to open the oil flow passage of the rodless chamber pipeline.

[0092] Specifically, when it is necessary to replenish the rodless chamber with oil, the first balance valve and the first check valve are opened to allow the oil in the rodless chamber pipeline to flow through the passage. At this time, the oil in the oil tank can flow through the first check valve and the first balance valve into the rodless chamber, thereby increasing the pressure in the rodless chamber.

[0093] S250 controls the hydraulic compensation valve group to open the oil flow passage of the rod chamber pipeline, and controls the hydraulic drive control valve group to open the rod chamber pipeline and the oil inlet pipeline, so that the oil in the oil tank enters the rod chamber through the oil inlet pipeline and the rod chamber pipeline.

[0094] Specifically, when the boom luffing cylinder is in a compressed state and the second pressure value is less than the second pressure threshold, it indicates that the actual pressure in the rod chamber is less than the minimum preset pressure value, and air is released or leaks inside the rodless chamber. Therefore, by controlling the hydraulic compensation valve group to open the oil flow passage in the rod chamber pipeline and controlling the hydraulic drive control valve group to open the rod chamber pipeline and the oil inlet pipeline, the oil in the tank enters the rod chamber through the oil inlet pipeline and the rod chamber pipeline to increase the pressure in the rod chamber and avoid boom swaying caused by the change in the state of the boom luffing cylinder.

[0095] In an optional embodiment, controlling the hydraulic compensation valve assembly to open the oil flow passage of the rod chamber pipeline includes: controlling the second balance valve and the second check valve to open the oil flow passage of the rod chamber pipeline.

[0096] Specifically, when it is necessary to replenish oil to the rod chamber, the second balance valve and the second check valve are opened to allow the oil to flow through the rod chamber pipeline. At this time, the oil in the tank can flow through the second check valve and the second balance valve into the rod chamber, thereby increasing the pressure in the rod chamber.

[0097] This embodiment controls the hydraulic compensation valve group to open the oil flow passage in the rodless chamber pipeline and the hydraulic drive control valve group to open the rodless chamber pipeline and the oil inlet pipeline when the current state of the boom luffing cylinder is in the stretched state and the first pressure value is less than the first pressure threshold, so that the oil in the tank enters the rodless chamber through the oil inlet pipeline and the rodless chamber pipeline; and controls the hydraulic compensation valve group to open the oil flow passage in the rod chamber pipeline and the hydraulic drive control valve group to open the rod chamber pipeline and the oil inlet pipeline when the current state of the boom luffing cylinder is in the compressed state and the second pressure value is less than the second pressure threshold, so that the oil in the boom luffing cylinder enters the rod chamber through the oil inlet pipeline and the rod chamber pipeline. This avoids boom swaying caused by changes in the state of the boom luffing cylinder, thus improving the stability of the articulated boom aerial work platform and the safety of the operators.

[0098] Example 4

[0099] Figure 5 This is a flowchart illustrating a hydraulic compensation method for a boom lift aerial work platform according to Embodiment 4 of the present invention. Based on the above embodiments, this embodiment provides a detailed explanation of the conditions for stopping hydraulic compensation, such as... Figure 5 As shown, the hydraulic compensation method for this articulated boom aerial work platform includes:

[0100] S310, real-time acquisition of the status of the articulated boom variable boom cylinder, and acquisition of the first pressure value of the rodless chamber based on the first pressure sensor and the second pressure value of the rod chamber based on the second pressure sensor.

[0101] S320. When the current state of the boom luffing cylinder is the tension state, determine whether the first pressure value is less than the first pressure threshold; if so, execute S340.

[0102] S330: When the current state of the boom luffing cylinder is compression, determine whether the second pressure value is less than the second pressure threshold; if so, execute S350.

[0103] S340 controls the hydraulic compensation valve group to open the oil flow passage of the rodless chamber pipeline, and controls the hydraulic drive control valve group to open the rodless chamber pipeline and the oil inlet pipeline, so that the oil in the oil tank enters the rodless chamber through the oil inlet pipeline and the rodless chamber pipeline.

[0104] S350 controls the hydraulic compensation valve group to open the oil flow passage of the rod chamber pipeline, and controls the hydraulic drive control valve group to open the rod chamber pipeline and the oil inlet pipeline, so that the oil in the oil tank enters the rod chamber through the oil inlet pipeline and the rod chamber pipeline.

[0105] S360. Determine if the first pressure value is greater than the third pressure threshold; if so, execute S380.

[0106] The third pressure threshold is the compensation standard pressure value of the rodless chamber of the boom luffing cylinder. The third pressure threshold is higher than the first pressure threshold. For example, the third pressure threshold can be 1~2MPa higher than the first pressure threshold. The third pressure threshold can be set according to the performance of the first relief valve.

[0107] Specifically, when the first pressure value of the rodless chamber is greater than the third pressure threshold, it indicates that the hydraulic compensation of the rodless chamber has met the preset pressure requirements, and there is no need to continue to add oil. The hydraulic compensation of the rodless chamber should be terminated.

[0108] S370. Determine whether the second pressure value is greater than the fourth pressure threshold; if so, execute S390.

[0109] The fourth pressure threshold is the compensation standard pressure value of the rod chamber of the boom luffing cylinder. The fourth pressure threshold is higher than the second pressure threshold. For example, the fourth pressure threshold can be 1~2MPa higher than the second pressure threshold. The fourth pressure threshold can be set according to the performance of the second relief valve.

[0110] Specifically, when the second pressure value of the rod chamber is greater than the fourth pressure threshold, it indicates that the hydraulic compensation of the rod chamber has met the preset pressure requirements, and there is no need to continue to add oil. The hydraulic compensation of the rod chamber should be terminated.

[0111] S380, Control the first balance valve and the first check valve to close, thereby disconnecting the oil flow passage of the rodless chamber pipeline.

[0112] Specifically, when the first pressure value of the rodless chamber is greater than the third pressure threshold, the first balance valve and the first check valve are closed to disconnect the oil flow passage of the rodless chamber pipeline, so that the oil in the oil tank cannot enter the rodless chamber through the oil inlet pipeline and the rodless chamber pipeline, thus avoiding excessive pressure in the rodless chamber.

[0113] S390, control the second balancing valve and the second check valve to close, thereby disconnecting the oil flow passage in the rod chamber pipeline.

[0114] Specifically, when the second pressure value of the rod chamber is greater than the fourth pressure threshold, the second balance valve and the second check valve are closed to disconnect the oil flow passage of the rod chamber pipeline, so that the oil in the oil tank cannot enter the rod chamber through the oil inlet pipeline and the rod chamber pipeline, thus avoiding excessive pressure in the rod chamber.

[0115] This embodiment controls the first balance valve and the first check valve to close when the first pressure value is greater than the third pressure threshold, thereby disconnecting the oil flow passage in the rodless chamber pipeline. It also controls the second balance valve and the second check valve to close when the second pressure value is greater than the fourth pressure threshold, thereby disconnecting the oil flow passage in the rod chamber pipeline. This can prevent excessive pressure in either the rodless or rod chamber and improve the stability of the articulated boom lift.

[0116] Example 5

[0117] Figure 6 This is a flowchart illustrating a hydraulic compensation method for a boom lift aerial work platform according to Embodiment 5 of the present invention. Based on the above embodiments, this embodiment provides a detailed explanation of the conduction control method of the hydraulic compensation valve group when the states of the rodless and rod-type chambers change, such as... Figure 6 As shown, the hydraulic compensation method for this articulated boom aerial work platform includes:

[0118] S410: Real-time acquisition of the status of the articulated boom luffing cylinder, and acquisition of the first pressure value of the rodless chamber based on the first pressure sensor and the second pressure value of the rod chamber based on the second pressure sensor.

[0119] S420. Based on the first pressure value, the second pressure value, and the current state of the boom luffing cylinder, control the hydraulic compensation valve group and the hydraulic drive control valve group to perform hydraulic compensation on the rodless chamber or the rod chamber.

[0120] S430: Real-time acquisition of the cavity status of rodless and rod-type cavities.

[0121] Specifically, the states of the rodless and rod-mounted chambers correspond to different positions and heights of the working platform of the articulated boom lift, and the states of the rodless and rod-mounted chambers can be obtained through the controller of the articulated boom lift.

[0122] S440. When the rodless chamber becomes larger and the rod chamber becomes smaller, control the first balance valve and the first check valve to open so that the oil in the tank enters the rodless chamber through the oil inlet pipe and the rodless chamber pipe, and control the second balance valve and the second overflow valve to open so that the oil in the rod chamber enters the tank through the rod chamber pipe and the oil outlet pipe.

[0123] Specifically, when the rodless chamber becomes larger and the rod chamber becomes smaller, the first balance valve and the first check valve are activated, and the hydraulic drive control valve group is switched to the left side so that the oil in the tank enters the rodless chamber through the oil inlet pipe and the rodless chamber pipe. The second balance valve and the second relief valve are activated so that the oil in the rod chamber enters the oil tank through the rod chamber pipe and the oil outlet pipe. By replenishing the rodless chamber with oil and returning oil to the rod chamber, the oil in the rodless chamber and the rod chamber is kept full, thus maintaining the stability of the articulated boom aerial work platform.

[0124] S450. When the rodless chamber becomes smaller and the rod chamber becomes larger, control the second balance valve and the second check valve to open so that the oil in the tank enters the rod chamber through the oil inlet line and the rod chamber line, and control the first balance valve and the first overflow valve to open so that the oil in the rodless chamber enters the tank through the rodless chamber line and the oil outlet line.

[0125] Specifically, when the rodless chamber becomes smaller and the rod chamber becomes larger, the second balance valve and the second check valve are activated, and the hydraulic drive control valve group is switched to the right side so that the oil in the tank enters the rod chamber through the inlet pipe and the rod chamber pipe. The first balance valve and the first relief valve are activated so that the oil in the rodless chamber enters the tank through the rodless chamber pipe and the outlet pipe. By returning oil to the rodless chamber and replenishing oil to the rod chamber, the oil in the rodless chamber and the rod chamber is kept full, thus maintaining the stability of the articulated boom aerial work platform.

[0126] This embodiment acquires the real-time state of the rodless and rod chambers. When the rodless chamber expands and the rod chamber shrinks, it controls the first balance valve and the first check valve to open, allowing oil from the tank to enter the rodless chamber through the inlet pipe and the rodless chamber pipe. It also controls the second balance valve and the second overflow valve to allow oil from the rod chamber to enter the tank through the rod chamber pipe and the outlet pipe. Conversely, when the rodless chamber shrinks and the rod chamber expands, it controls the second balance valve and the second check valve to open, allowing oil from the tank to enter the rod chamber through the inlet pipe and the rod chamber pipe. It also controls the first balance valve and the first overflow valve to open, allowing oil from the rodless chamber to enter the tank through the rodless chamber pipe and the outlet pipe. This ensures that the oil in both the rodless and rod chambers is fully filled, maintaining pressure balance and thus ensuring the stability of the articulated boom lift.

[0127] Example 6

[0128] Based on the same inventive concept, this invention also provides an aerial work platform, including a turntable, a folding boom, a main boom, a main boom luffing cylinder, a working platform, and a hydraulic compensation system for the articulated boom aerial work platform; the turntable, folding boom, main boom, and working platform are connected sequentially, the folding boom luffing cylinder is connected between the turntable and the folding boom, and the main boom luffing cylinder is connected between the main boom and the folding boom. The aerial work platform provided in this embodiment includes the hydraulic compensation system of the articulated boom aerial work platform of any embodiment of this invention, and therefore possesses the beneficial effects of the corresponding hydraulic compensation system of the articulated boom aerial work platform. Similarities can be found in the above description, and will not be repeated here.

[0129] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, combinations, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A hydraulic compensation method for an articulated boom lift, comprising employing the hydraulic compensation system of the articulated boom lift, characterized in that, The hydraulic compensation system of the articulated boom lift includes: a boom luffing cylinder, a hydraulic compensation valve assembly, a hydraulic drive control valve assembly, an inlet pipe, an outlet pipe, a first pressure sensor, a second pressure sensor, a rodless chamber pipe, and a rod chamber pipe; the boom luffing cylinder includes a rodless chamber and a rod chamber, the first end of the rodless chamber pipe is connected to the rodless chamber, the second end of the rodless chamber pipe is connected to the inlet pipe and the outlet pipe through the hydraulic drive control valve assembly, the first end of the rod chamber pipe is connected to the rod chamber, and the second end of the rod chamber pipe is connected to the inlet pipe and the outlet pipe through the hydraulic drive control valve assembly; the hydraulic compensation valve assembly is disposed in the rodless chamber pipe and the rod chamber pipe; the first pressure sensor is disposed at the first end of the rodless chamber pipe, and the second pressure sensor is disposed at the first end of the rod chamber pipe; the hydraulic compensation method of the articulated boom lift includes: The status of the articulated boom variable luffing cylinder is acquired in real time, and the first pressure value of the rodless chamber is acquired based on the first pressure sensor and the second pressure value of the rod chamber is acquired based on the second pressure sensor. Based on the first pressure value, the second pressure value, and the current state of the boom luffing cylinder, the hydraulic compensation valve group and the hydraulic drive control valve group are controlled to perform hydraulic compensation on the rodless chamber or the rod chamber.

2. The hydraulic compensation method for the articulated boom lift aerial work platform according to claim 1, characterized in that, Based on the first pressure value, the second pressure value, and the current state of the boom luffing cylinder, the hydraulic compensation valve group and the hydraulic drive control valve group are controlled to perform hydraulic compensation on the rodless chamber or the rod chamber, including: When the current state of the articulated boom luffing cylinder is the tension state, it is determined whether the first pressure value is less than the first pressure threshold. If so, the hydraulic compensation valve group is controlled to open the oil flow passage of the rodless chamber pipeline, and the hydraulic drive control valve group is controlled to open the rodless chamber pipeline and the oil inlet pipeline, so that the oil in the oil tank enters the rodless chamber through the oil inlet pipeline and the rodless chamber pipeline.

3. The hydraulic compensation method for the articulated boom lift aerial work platform according to claim 1, characterized in that, Based on the first pressure value, the second pressure value, and the current state of the boom luffing cylinder, the hydraulic compensation valve group and the hydraulic drive control valve group are controlled to perform hydraulic compensation on the rodless chamber or the rod chamber, including: When the current state of the articulated boom luffing cylinder is the compression state, it is determined whether the second pressure value is less than the second pressure threshold. If so, the hydraulic compensation valve group is controlled to open the oil flow passage of the rod chamber pipeline, and the hydraulic drive control valve group is controlled to open the rod chamber pipeline and the oil inlet pipeline, so that the oil in the oil tank enters the rod chamber through the oil inlet pipeline and the rod chamber pipeline.

4. The hydraulic compensation method for the articulated boom lift aerial work platform according to claim 2, characterized in that, The hydraulic compensation valve assembly includes: a first balance valve, a second balance valve, a first check valve, and a second check valve; the first balance valve and the first check valve are connected in series in the rodless chamber pipeline; the second balance valve and the second check valve are connected in series in the rod chamber pipeline. Controlling the hydraulic compensation valve assembly to open the oil flow passage of the rodless chamber pipeline includes: Control the first balance valve and the first check valve to open, so as to open the oil flow passage of the rodless chamber pipeline.

5. The hydraulic compensation method for the articulated boom lift aerial work platform according to claim 3, characterized in that, The hydraulic compensation valve assembly includes: a first balance valve, a second balance valve, a first check valve, and a second check valve; the first balance valve and the first check valve are connected in series in the rodless chamber pipeline; the second balance valve and the second check valve are connected in series in the rod chamber pipeline. Controlling the hydraulic compensation valve assembly to open the oil flow passage of the rod chamber pipeline includes: Control the second balance valve and the second check valve to open, so as to open the oil flow passage of the rod chamber pipeline.

6. The hydraulic compensation method for the articulated boom lift aerial work platform according to claim 4, characterized in that, After the oil in the tank enters the rodless chamber through the oil inlet pipe and the rodless chamber pipe, it further includes: Determine whether the first pressure value is greater than the third pressure threshold; If so, the first balancing valve and the first check valve are closed to disconnect the oil flow passage of the rodless chamber pipeline.

7. The hydraulic compensation method for the articulated boom lift aerial work platform according to claim 5, characterized in that, After the oil in the tank enters the rod chamber through the oil inlet pipe and the rod chamber pipe, it further includes: Determine whether the second pressure value is greater than the fourth pressure threshold; If so, the second balance valve and the second check valve are closed to disconnect the oil flow passage of the rod chamber pipeline.

8. The hydraulic compensation method for the articulated boom lift aerial work platform according to claim 4 or 5, characterized in that, The hydraulic compensation valve assembly further includes: a first relief valve and a second relief valve; the first relief valve and the first check valve are connected in parallel in the rodless chamber pipeline; the second relief valve and the second check valve are connected in parallel in the rod chamber pipeline; the hydraulic compensation method of the articulated boom lift also includes: The cavity states of the rodless cavity and the rod cavity are acquired in real time; When the rodless chamber becomes larger and the rod chamber becomes smaller, the first balance valve and the first check valve are opened to allow oil in the tank to enter the rodless chamber through the inlet pipe and the rodless chamber pipe, and the second balance valve and the second overflow valve are opened to allow oil in the rod chamber to enter the tank through the rod chamber pipe and the outlet pipe. When the rodless chamber becomes smaller and the rod chamber becomes larger, the second balance valve and the second check valve are opened to allow the oil in the tank to enter the rod chamber through the inlet pipe and the rod chamber pipe, and the first balance valve and the first overflow valve are opened to allow the oil in the rodless chamber to enter the tank through the rodless chamber pipe and the outlet pipe.

9. A hydraulic compensation system for a boom lift aerial work platform, characterized in that, include: The boom luffing cylinder, hydraulic compensation valve assembly, hydraulic drive control valve assembly, oil inlet pipeline, oil outlet pipeline, first pressure sensor, second pressure sensor, rodless chamber pipeline and rod chamber pipeline; The articulated boom luffing cylinder includes a rodless chamber and a rod chamber. The first end of the rodless chamber pipeline is connected to the rodless chamber, and the second end of the rodless chamber pipeline is connected to the oil inlet pipeline and the oil outlet pipeline through the hydraulic drive control valve group. The first end of the rod chamber pipeline is connected to the rod chamber, and the second end of the rod chamber pipeline is connected to the oil inlet pipeline and the oil outlet pipeline through the hydraulic drive control valve group. The first end of the oil inlet pipe is connected to the rodless chamber pipe and the rod chamber pipe through the hydraulic drive control valve group, and the second end of the oil inlet pipe is connected to the oil tank; the first end of the oil outlet pipe is connected to the rodless chamber pipe and the rod chamber pipe through the hydraulic drive control valve group, and the second end of the oil outlet pipe is connected to the oil tank. The hydraulic compensation valve assembly is disposed in the rodless cavity pipeline and the rod cavity pipeline; the hydraulic compensation valve assembly is used to control the opening or closing of the rodless cavity pipeline and the rod cavity pipeline; The hydraulic drive control valve assembly is disposed in the oil inlet pipe and the oil outlet pipe; the hydraulic drive control valve assembly is used to control the opening or closing of the oil inlet pipe and the oil outlet pipe; the first pressure sensor is disposed at the first end of the rodless chamber pipe, and the second pressure sensor is disposed at the first end of the rod chamber pipe; the first pressure sensor is used to detect the pressure value of the rodless chamber, and the second pressure sensor is used to detect the pressure value of the rod chamber. The hydraulic compensation system of the articulated boom lift also includes a controller, which is connected to the first pressure sensor, the second pressure sensor, the hydraulic compensation valve group and the hydraulic drive control valve group respectively. The controller is used to execute the hydraulic compensation method of the articulated boom lift according to any one of claims 1-8.

10. The hydraulic compensation system of the articulated boom lift aerial work platform according to claim 9, characterized in that, The hydraulic compensation valve assembly includes: a first balance valve, a second balance valve, a first check valve, a second check valve, a first relief valve, and a second relief valve; The first balance valve and the first relief valve are connected in series in the rodless chamber pipeline, and the first check valve and the first relief valve are connected in parallel in the rodless chamber pipeline; the first balance valve is used to lock the oil in the rodless chamber to maintain the pressure in the rodless chamber, the first check valve is used to allow the oil in the oil tank to enter the rodless chamber unidirectionally through the hydraulic drive control valve group and the rodless chamber pipeline when it is turned on, and the first relief valve is used to allow the oil in the rodless chamber to enter the oil tank through the rodless chamber pipeline and the hydraulic drive control valve group when it is turned on; The second balance valve and the second relief valve are connected in series in the rod chamber pipeline, and the second check valve and the second relief valve are connected in parallel in the rod chamber pipeline. The second balance valve is used to lock the oil in the rod chamber to maintain the pressure in the rod chamber. The second check valve is used to allow the oil in the oil tank to enter the rod chamber in one direction through the hydraulic drive control valve group and the rod chamber pipeline when it is turned on. The second relief valve is used to allow the oil in the rod chamber to enter the oil tank through the rod chamber pipeline and the hydraulic drive control valve group when it is turned on.

11. The hydraulic compensation system of the articulated boom lift aerial work platform according to claim 9, characterized in that, Also includes: Third relief valve, functional pump and motor; The functional pump is installed in the oil inlet pipeline, and the motor is connected to the functional pump; The motor is used to drive the functional pump to rotate, so that the functional pump draws out the oil from the oil tank; The first end of the third relief valve is connected to the oil inlet pipe, and the second end of the third relief valve is connected to the oil outlet pipe; the third relief valve is used to limit the maximum pressure of the hydraulic compensation system of the articulated boom aerial work platform.

12. A high-altitude work equipment, characterized in that, Includes a turntable, a folding boom, a main boom, a main boom luffing cylinder, a working platform, and a hydraulic compensation system for the articulated boom aerial work platform as described in any one of claims 9-11; The turntable, the folding boom, the main boom, and the working platform are connected in sequence. The folding boom luffing cylinder is connected between the turntable and the folding boom, and the main boom luffing cylinder is connected between the main boom and the folding boom.

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