Hydraulic control system for suction cup tools and aerial work platform

Abstract

The application discloses a kind of suction cup tool hydraulic control system and aerial work suction cup car, and suction cup tool includes multiple tool action execution mechanism, and suction cup tool hydraulic control system includes working pressure oil circuit and main oil return oil circuit;Multiple tool action hydraulic circuit is connected in parallel in working pressure oil circuit and main oil return oil circuit, each tool action hydraulic circuit includes corresponding tool action execution mechanism and the tool action reversing valve for switching control tool action execution mechanism;And common proportional valve is arranged at the oil inlet end of working pressure oil circuit.The application is specifically designed to control multiple tool actions of one proportional valve hydraulic control system, that is, a single common proportional valve is used, and multiple tool action hydraulic circuits are connected in parallel in working pressure oil circuit and main oil return oil circuit, so as to realize single proportional valve control multiple tool actions, greatly reduce the number of proportional valve, simplify the structure of hydraulic system, and reduce system cost.

Description

Technical Field

[0001] This application belongs to the field of high-altitude work technology, specifically, it relates to a high-altitude work suction cup vehicle and its suction cup attachment hydraulic control system. Background Technology

[0002] Aerial work suction cup trucks are typically used for glass installation in high-rise buildings, among other applications. Figure 1 The aerial work platform with suction cups shown includes a suction cup attachment 100 located at the end of the main boom 200. See also... Figure 2 The suction cup attachment 100 includes an adsorption mechanism and an adjustment mechanism. The adsorption mechanism is equipped with multiple suction cups 01, which can firmly adsorb the glass 09. The adjustment mechanism includes a first swing unit 02, a telescopic unit 03, a left and right translation unit 04, a pitch unit 05, a second swing unit 06, a vertical lifting unit 07, and a rotation unit 08 arranged in sequence. The position and posture of the glass 09 can be adjusted through the adjustment mechanism, making the glass installation operation more flexible and convenient.

[0003] Since each functional unit of the suction cup attachment 100 has at least one attachment action actuator, the total number of attachment actions that can be achieved is large, and each action requires proportional control. Therefore, traditional suction cup attachment hydraulic control systems require the addition of a proportional valve before each action, which not only increases costs but also increases the failure rate. At the same time, the complex distribution of the attachment action actuators leads to crossed, excessively long, and inconvenient pipelines. Summary of the Invention

[0004] The purpose of this application is to provide a hydraulic control system for a suction cup attachment and a high-altitude work suction cup vehicle.

[0005] To achieve the above objectives, the first aspect of this application provides a hydraulic control system for a suction cup attachment. The suction cup attachment includes multiple attachment actuation mechanisms, and the hydraulic control system for the suction cup attachment includes:

[0006] Working pressure oil circuit and main return oil circuit;

[0007] Multiple attachment action hydraulic circuits are connected in parallel to the working pressure oil circuit and the main return oil circuit. Each attachment action hydraulic circuit includes a corresponding attachment action actuator and an attachment action directional valve for switching and controlling the attachment action actuator.

[0008] A common proportional valve is installed at the inlet end of the working pressure oil circuit.

[0009] In some embodiments, the suction cup attachment includes multiple attachment action actuator groups and multiple attachment control valves corresponding to control the multiple attachment action actuator groups. Each attachment action actuator group includes one attachment action actuator or multiple attachment action actuators located adjacent to each other. Each attachment control valve integrates a corresponding attachment action reversing valve or multiple attachment action reversing valves connected in parallel.

[0010] In some embodiments, the plurality of attachment control valves are divided into proportional attachment control valves and at least one group attachment control valve. The proportional attachment control valve integrates the common proportional valve and at least one attachment actuation directional valve, and the group attachment control valve integrates at least one attachment actuation directional valve.

[0011] In some embodiments, the suction cup attachment includes a boom leveling cylinder, a boom telescopic cylinder, a suction cup pitch cylinder, a horizontal movement cylinder, a vertical lifting cylinder, a suction cup rotary motor, a suction cup swing motor, and a forearm telescopic cylinder as the actuator of the attachment.

[0012] Furthermore, the proportional attachment control valve integrates the common proportional valve and two attachment action reversing valves that control the boom leveling cylinder and the boom telescopic cylinder respectively. The group attachment control valve integrates six attachment action reversing valves that control the suction cup pitch cylinder, horizontal movement cylinder, vertical lifting cylinder, suction cup rotary motor, suction cup swing motor and forearm telescopic cylinder respectively.

[0013] In some embodiments, the suction cup attachment hydraulic control system includes:

[0014] The compensator is located at the oil inlet end of the working pressure oil circuit;

[0015] The compensator is connected in series on one side of the oil outlet of the common proportional valve for diversion and unloading.

[0016] In some embodiments, the compensator is a two-position four-way directional valve with the valve core having any intermediate position and includes:

[0017] The first oil inlet is connected to the oil outlet of the shared proportional valve;

[0018] The second oil inlet is connected to the oil inlet of the shared proportional valve;

[0019] The first working oil port is connected to the working pressure oil circuit;

[0020] The second working oil port is connected to the main return oil circuit.

[0021] In some embodiments, the hydraulic control chambers at both ends of the compensator are respectively connected to the first oil inlet and the second oil inlet.

[0022] In some embodiments, the common proportional valve is a two-position two-way solenoid directional valve with an arbitrary intermediate position of the valve core.

[0023] In the case where the electromagnet of the common proportional valve is de-energized, the oil outlet of the common proportional valve is disconnected from the oil inlet, and the second oil inlet of the compensator is connected to the second working oil port.

[0024] When the electromagnet of the common proportional valve is energized, the oil outlet of the common proportional valve is connected to the oil inlet, the first oil inlet of the compensator is connected to the first working oil port, and excess pressure oil can return through the second working oil port.

[0025] In some embodiments, the compensator is a two-position two-way directional valve with an arbitrary intermediate position of the valve core, and the hydraulic control chambers at both ends are respectively connected to the oil inlet and oil outlet on both sides of the common proportional valve.

[0026] In some embodiments, the suction cup attachment hydraulic control system includes:

[0027] The main relief valve is connected between the main return oil circuit and the inlet of the common proportional valve.

[0028] Furthermore, in a second aspect of this application, a high-altitude work suction cup vehicle is provided, including the aforementioned suction cup attachment hydraulic control system.

[0029] In the hydraulic control system of the aerial work platform suction cup vehicle and its suction cup attachments, given that each action of the aerial work platform suction cup vehicle is a single action, a hydraulic control system is specifically designed where a single proportional valve can control the actions of multiple attachments. This involves using a single shared proportional valve, with multiple attachment action hydraulic circuits connected in parallel to the working pressure oil circuit and the main return oil circuit. This allows a single proportional valve to control multiple attachment actions, significantly reducing the number of proportional valves, simplifying the hydraulic system structure, and lowering system costs. Furthermore, the multiple attachment action actuators can be arbitrarily combined, with each action controlled by a shared proportional valve and a corresponding attachment action directional valve. Therefore, the combination of attachment control valves can be adjusted according to the positional distribution of the attachment action actuators, facilitating the arrangement of attachment control valves and reducing problems such as pipeline crossings and excessive length.

[0030] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description

[0031] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. In the drawings:

[0032] Figure 1 This is a structural diagram of a common aerial work suction cup vehicle;

[0033] Figure 2 for Figure 1 A schematic diagram of the suction cup attachment of a high-altitude work suction cup vehicle;

[0034] Figure 3 This is a hydraulic schematic diagram of a suction cup attachment hydraulic control system according to one specific embodiment of this application;

[0035] Figure 4 for Figure 3 A partially enlarged schematic diagram of the compensator and common proportional valve section in the diagram;

[0036] Figure 5 A hydraulic schematic diagram of a suction cup attachment hydraulic control system according to another specific embodiment of this application;

[0037] Figure 6 for Figure 5 A partially enlarged schematic diagram of the compensator and common proportional valve section.

[0038] Explanation of reference numerals in the attached figures

[0039] 1. Compensator 2. Shared proportional valve

[0040] 3. Main relief valve; 4. Boom leveling and reversing valve

[0041] 5. Flying boom telescopic directional valve; 6. Suction cup pitch directional valve

[0042] 7 Horizontal directional valve 8 Vertical lift directional valve

[0043] 9. Suction cup return directional valve; 10. Suction cup swing directional valve

[0044] 11 Boom telescopic reversing valve; 12 Proportional attachment control valve

[0045] 13 Group Attachment Control Valve 20 Boom Leveling Cylinder

[0046] 30mm telescopic boom cylinder, 40mm suction cup pitch cylinder

[0047] 50 horizontal moving hydraulic cylinder 60 vertical lifting hydraulic cylinder

[0048] 70 suction cup rotary motor 80 suction cup oscillating motor

[0049] 90mm boom telescopic cylinder, 100mm suction cup attachment

[0050] 200 main boom a oil inlet

[0051] b Oil outlet c First oil inlet

[0052] d Second oil inlet e First working oil inlet

[0053] f Second working oil port Y1 electromagnet

[0054] L0 Main return oil circuit; L1 Working pressure oil circuit Detailed Implementation

[0055] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0056] The hydraulic control system for the suction cup attachment and the aerial work suction cup vehicle according to this application are described below with reference to the accompanying drawings.

[0057] This application discloses a hydraulic control system for a suction cup attachment, the suction cup attachment including multiple attachment action actuators. Figure 3 In the illustrated embodiment, the suction cup attachment hydraulic control system includes:

[0058] Working pressure oil circuit L1 and main return oil circuit L0;

[0059] Multiple attachment actuation hydraulic circuits are connected in parallel to the working pressure oil circuit L1 and the main return oil circuit L0. Each attachment actuation hydraulic circuit includes a corresponding attachment actuation mechanism and an attachment actuation directional valve for switching and controlling the attachment actuation mechanism; and

[0060] The common proportional valve 2 is installed at the oil inlet end of the working pressure oil circuit L1.

[0061] As mentioned above, considering that the aerial work platform suction cup truck has many attachment actuators and each action requires proportional control, adding a proportional valve before each action would undoubtedly increase cost and failure rate. Furthermore, the complex distribution of these actuators leads to crisscrossing, excessively long, and inconveniently connected pipelines. Therefore, considering that each action of the aerial work platform suction cup truck is a single action, this application designs a hydraulic control system where one proportional valve can control multiple attachment actions. Multiple attachment actuators can be arbitrarily combined, and each action is controlled by a shared proportional valve 2 and a corresponding attachment action directional valve. In this way, using a single proportional valve (i.e., the shared proportional valve 2) to control multiple attachment actions significantly reduces the number of proportional valves, simplifies the hydraulic system structure, and lowers system costs.

[0062] Considering the complex location distribution of multiple attachment actuators, which can easily lead to problems such as pipeline crossings, excessive length, and inconvenient connections, the various attachment actuators can be grouped, and one or more attachment directional valves within each group can be integrated into a single attachment control valve. That is, the suction cup attachment 100 includes multiple attachment actuator groups and multiple attachment control valves corresponding to these groups. Each attachment actuator group includes one attachment actuator or multiple adjacent attachment actuators, and each attachment control valve integrates a corresponding attachment directional valve or multiple attachment directional valves connected in parallel. In other words, the combination of attachment control valves can be adjusted according to the location distribution of the attachment actuators to facilitate valve placement and reduce problems such as pipeline crossings and excessive length.

[0063] As an example, in Figure 3 , Figure 5 In this embodiment, the multiple attachment control valves are divided into proportional attachment control valves 12 and at least one group attachment control valve 13. The proportional attachment control valve 12 integrates a common proportional valve 2 and at least one attachment actuation directional valve, while the group attachment control valve 13 integrates at least one attachment actuation directional valve. Pressure oil enters from the P port of the proportional attachment control valve 12. The P1 and T1 ports of the proportional attachment control valve 12 are connected to the P and T ports of the group attachment control valve 13, respectively, forming a common working pressure oil circuit L1 and a main return oil circuit L0. Based on the working pressure oil circuit L1, the hydraulic circuits for each attachment actuation are connected in parallel. This grouping method of the proportional attachment control valve 12 and at least one group attachment control valve 13 facilitates the connection and arrangement of the valves.

[0064] As an example, such as Figure 3 , Figure 5As shown, the suction cup attachment 100 generally includes a boom leveling cylinder 20, a boom telescopic cylinder 30, a suction cup pitch cylinder 40, a horizontal movement cylinder 50, a vertical lifting cylinder 60, a suction cup rotary motor 70, a suction cup swing motor 80, and a forearm telescopic cylinder 90 as attachment action actuators; furthermore, the proportional attachment control valve 12 integrates a common proportional valve 2 and two attachment action reversing valves that respectively control the boom leveling cylinder 20 and the boom telescopic cylinder 30, i.e., parallel boom... The frame leveling directional valve 4 and the boom extension directional valve 5 are integrated within the group attachment control valve 13. These valves control the suction cup pitch cylinder 40, horizontal movement cylinder 50, vertical lifting cylinder 60, suction cup rotary motor 70, suction cup swing motor 80, and boom extension cylinder 90 respectively. Specifically, these are the parallel suction cup pitch directional valve 6, horizontal movement directional valve 7, vertical lifting directional valve 8, suction cup rotary directional valve 9, suction cup swing directional valve 10, and boom extension directional valve 11. In this example, a single proportional valve controls all eight attachment movements. The internal control loops of each attachment movement are independent and can all achieve proportional control. Furthermore, the positions of the attachment movement directional valves (all shown are three-position four-way directional valves) can be adjusted according to actual needs.

[0065] It should be noted that, although Figure 3 , Figure 5 It includes a proportional attachment control valve 12 and a group attachment control valve 13, but obviously, there can be multiple group attachment control valves 13.

[0066] As can be seen above, the directional control valves of multiple attachment actuators can be arbitrarily combined to form an attachment directional valve. The combination of attachment control valves can be adjusted according to the positional distribution of the attachment actuators. For example, in a hydraulic control system with eight attachment actuators, the number of attachment control valves can be combined in ways such as "2+6", "1+2+5", or "2+2+2+2". The attachment control valves can be designed and matched according to the position of the attachment actuators. This not only simplifies the structure of the hydraulic control system but also greatly reduces the number of pipelines and facilitates the connection between attachment control valves, thereby reducing costs and failure rates.

[0067] Furthermore, for most working hydraulic systems, setting the maximum operating oil pressure of the system to control the main relief valve for safety is essential and cannot be ignored. Figure 3 , Figure 5 In the hydraulic control system of the suction cup attachment, a main relief valve 3 is included. The main relief valve 3 is connected between the main return oil circuit L0 and the oil inlet a of the common proportional valve 2. For the hydraulic control system of the suction cup attachment where a single proportional valve controls the actions of multiple attachments, the main relief valve 3 is always in an overflow state because the P port of the proportional attachment control valve 12 cannot be depressurized, which will result in high energy consumption.

[0068] Therefore, this application adds a compensator 1 after the common proportional valve 2, which can directly return excess flow to the oil tank, eliminating the need for a separate unloading circuit. This simplifies the control valve structure, reduces costs, achieves load-sensitive control of attachment movements, and saves energy. Figure 4 , Figure 6 As shown, the hydraulic control system for the suction cup attachment includes:

[0069] Compensator 1 is installed at the oil inlet end of the working pressure oil circuit L1;

[0070] The compensator 1 is connected in series on the oil outlet b side of the common proportional valve 2 for diversion and unloading, so that the excess flow can be directly returned to the oil tank through the compensator 1.

[0071] As an example, Figure 4 The compensator 1 shown is a two-position two-way directional valve with an arbitrary intermediate position of the valve core, and the hydraulic control chambers at both ends are respectively connected to the oil inlet a and oil outlet b on both sides of the common proportional valve 2.

[0072] Figure 6 The compensator 1 shown is a two-position four-way directional valve with an arbitrary intermediate position of the valve core and includes:

[0073] The first oil inlet c is connected to the oil outlet b of the shared proportional valve 2;

[0074] The second oil inlet d is connected to the oil inlet a of the shared proportional valve 2;

[0075] The first working oil port e is connected to the working pressure oil circuit L1;

[0076] The second working oil port f is connected to the main return oil circuit L0.

[0077] In this way, when the proportional valve 2 supplies oil proportionally, most of the oil can be connected to the working pressure oil circuit L1 through the first working oil port e, and the excess small part of the oil can flow to the second working oil port f through the valve core, thereby flowing directly to the main return oil circuit L0 to realize the return oil.

[0078] exist Figure 6 More specifically, the hydraulic control chambers at both ends of the compensator 1 are connected to the first oil inlet c and the second oil inlet d, respectively. Thus, when the common proportional valve 2 is in the left conducting position as shown in the figure, the hydraulically controlled compensator 1 naturally switches to the left conducting position as well, thereby achieving linkage control between the compensator 1 and the common proportional valve 2 through hydraulic control.

[0079] Furthermore, in Figure 5 , Figure 6In this implementation, the shared proportional valve 2 can be a two-position, two-way solenoid directional valve with an arbitrary intermediate position of the valve core. Specifically, when the electromagnet Y1 of the compensating valve 1 is de-energized, the oil outlet b of the shared proportional valve 2 is disconnected from the oil inlet a, and the second oil inlet d of the compensator 1 is connected to the second working oil port f. When the electromagnet Y1 of the compensating valve 1 is energized, the oil outlet b of the shared proportional valve 2 is connected to the oil inlet a, the first oil inlet c of the compensator 1 is connected to the first working oil port e, and excess pressure oil can return through the second working oil port f. Therefore, the compensator 1 and the shared proportional valve 2 can be controlled in tandem using a single electromagnet Y1.

[0080] Specifically, when electromagnet Y1 is energized, compensator 1 reverses direction, and the pressure oil at port P of proportional attachment control valve 12 flows in from port a of common proportional valve 2, flows out through the first working port e of compensator 1, and enters each attachment action control circuit. Excess pressure oil at port P can flow directly back to the oil tank from the second working port f of compensator 1.

[0081] When electromagnet Y1 is not energized, compensator 1 switches to the right position shown in the diagram, and pressurized oil flows directly back to the oil tank from the second oil inlet d of compensator 1. Regardless of whether electromagnet Y1 is energized or not, it will not cause pressure buildup and open the main relief valve 3, which can reduce the pressure at port P of proportional attachment control valve 12 and reduce energy consumption.

[0082] Regarding proportional control, when electromagnets Y1 and Y3 are energized, the pressurized oil flowing out through the shared proportional valve 2 passes through the three-position four-way boom leveling directional valve 4, flows from port A1 into port V1 of the balance valve, and then into the rodless chamber of the boom leveling cylinder 20, causing the boom leveling cylinder to extend. When electromagnets Y1 and Y2 are energized, the pressurized oil passes through the three-position four-way boom leveling directional valve 4, flows from port B1 into port V2 of the balance valve, and then into the rod chamber of the boom leveling cylinder 20, causing the boom leveling cylinder to retract. The principles of the other seven actions are similar and will not be described in detail.

[0083] In addition, this application also discloses a high-altitude work suction cup vehicle, including the aforementioned suction cup attachment hydraulic control system.

[0084] In summary, this application presents a hydraulic control system in which a single proportional valve can control the actions of multiple attachments, simplifying the hydraulic control system structure and reducing costs. The attachment control valves for multiple attachment actions can be arbitrarily combined, with each action controlled by a shared proportional valve and an action directional valve. The combination of attachment control valves can be adjusted according to the positional distribution of the attachment action actuators. The proportional valve and compensator can directly return excess flow to the oil tank, eliminating the need for a separate unloading circuit, thus simplifying the control valve structure, reducing costs, achieving load-sensitive control of attachment actions, and saving energy.

[0085] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0086] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0087] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0088] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A hydraulic control system for a suction cup attachment, the suction cup attachment comprising multiple attachment actuation mechanisms, characterized in that, The hydraulic control system for the suction cup attachment includes: Working pressure oil circuit (L1) and main return oil circuit (L0); Multiple attachment action hydraulic circuits are connected in parallel to the working pressure oil circuit (L1) and the main return oil circuit (L0). Each attachment action hydraulic circuit includes a corresponding attachment action actuator and an attachment action directional valve for switching control of the attachment action actuator. A common proportional valve (2) is installed at the inlet end of the working pressure oil circuit (L1); The compensator (1) is installed at the oil inlet end of the working pressure oil circuit (L1); The suction cup attachment (100) includes multiple attachment action actuator groups and multiple attachment control valves corresponding to control the multiple attachment action actuator groups. Each attachment action actuator group includes one attachment action actuator or multiple attachment action actuators located adjacent to each other. Each attachment control valve integrates an attachment action reversing valve or multiple attachment action reversing valves connected in parallel. The multiple attachment control valves are divided into proportional attachment control valves (12) and at least one group attachment control valve (13). The proportional attachment control valve (12) integrates the common proportional valve (2) and at least one group proportional valve (13). The attachment action directional valve is integrated within the group attachment control valve (13). The compensator (1) is connected in series to the oil outlet (b) side of the common proportional valve (2) for diversion and unloading. The compensator (1) is a two-position four-way directional valve with an arbitrary intermediate position of the valve core and includes: a first oil inlet (c) connected to the oil outlet (b) of the common proportional valve (2); a second oil inlet (d) connected to the oil inlet (a) of the common proportional valve (2); a first working oil port (e) connected to the working pressure oil circuit (L1); and a second working oil port (f) connected to the main return oil circuit (L0).

2. The hydraulic control system for the suction cup attachment according to claim 1, characterized in that, The suction cup attachment (100) includes a boom leveling cylinder (20), a boom telescopic cylinder (30), a suction cup pitch cylinder (40), a horizontal movement cylinder (50), a vertical lifting cylinder (60), a suction cup rotary motor (70), a suction cup swing motor (80), and a forearm telescopic cylinder (90) as the attachment's action execution mechanism. Furthermore, the proportional attachment control valve (12) integrates the common proportional valve (2) and two attachment action reversing valves that control the boom leveling cylinder (20) and the boom telescopic cylinder (30) respectively. The group attachment control valve (13) integrates six attachment action reversing valves that control the suction cup pitch cylinder (40), horizontal movement cylinder (50), vertical lifting cylinder (60), suction cup rotary motor (70), suction cup swing motor (80) and forearm telescopic cylinder (90) respectively.

3. The hydraulic control system for the suction cup attachment according to claim 1, characterized in that, The hydraulic control cavities at both ends of the compensator (1) are respectively connected to the first oil inlet (c) and the second oil inlet (d).

4. The hydraulic control system for the suction cup attachment according to claim 3, characterized in that, The common proportional valve (2) is a two-position two-way electromagnetic directional valve with an arbitrary intermediate position of the valve core. In the case where the electromagnet (Y1) of the common proportional valve (2) is de-energized, the oil outlet (b) of the common proportional valve (2) is disconnected from the oil inlet (a), and the second oil inlet (d) of the compensator (1) is connected to the second working oil port (f). When the electromagnet (Y1) of the common proportional valve (2) is energized, the oil outlet (b) of the common proportional valve (2) is connected to the oil inlet (a), the first oil inlet (c) of the compensator (1) is connected to the first working oil port (e), and excess pressure oil can return through the second working oil port (f).

5. The hydraulic control system for the suction cup attachment according to claim 1, characterized in that, The compensator (1) is a two-position two-way directional valve with a valve core in any middle position and the hydraulic control chambers at both ends are respectively connected to the oil inlet (a) and oil outlet (b) on both sides of the common proportional valve (2).

6. The hydraulic control system for the suction cup attachment according to claim 1, characterized in that, The hydraulic control system for the suction cup attachment includes: The main relief valve (3) is connected between the main return oil circuit (L0) and the inlet (a) of the common proportional valve (2).

7. A high-altitude work suction cup vehicle, characterized in that, The aerial work suction cup vehicle includes a suction cup attachment hydraulic control system according to any one of claims 1 to 6.

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