A safety control system and method for an aerial work platform and an aerial work platform

Abstract

This invention discloses a safety control system, method, and aerial work platform vehicle. The system includes an oil tank, a hydraulic pump, a luffing control valve group, a telescopic control valve group, a slewing control valve group, a boom luffing cylinder, a boom telescopic cylinder, a turntable slewing motor, a three-way flow valve, a first unloading valve, a hydraulic detection module, a boom luffing detection module, a boom telescopic detection module, and a control module. In the aerial work platform vehicle safety control system of this invention, if a hydraulic pump malfunction causes excessive pressure or a control valve group malfunction causes accidental boom movement, the hydraulic pump is shut down to prevent pressure build-up at the actuator's oil port. Simultaneously, the first unloading valve is closed to promptly release the flow in the system. This effectively prevents uncontrolled vehicle movement caused by malfunctions or abnormalities in the directional valve or oil source, ensuring the safety of workers.

Description

Technical Field

[0001] This invention relates to the field of aerial work platform technology, and in particular to a safety control system, method, and aerial work platform for aerial work platforms. Background Technology

[0002] Aerial work platforms are specialized vehicles used to transport workers and equipment to high altitudes for installation, maintenance, and cleaning. Compared to traditional methods such as scaffolding and ladders, aerial work platforms offer advantages such as superior performance, higher efficiency, and greater safety, and are widely used in infrastructure industries such as power, transportation, petrochemicals, telecommunications, and landscaping.

[0003] Currently, due to increasing demands for operational comfort, aerial work platforms are beginning to be equipped with multi-way valves. Compared to traditional threaded cartridge valves, multi-way valves have a longer valve core displacement stroke, a wider proportional control range, and better maneuverability and comfort, making them increasingly popular with OEMs and end customers. However, due to the limited thrust of electromagnetic direct drive systems, changes in fluid cleanliness after vehicle use can cause multi-way valve jamming, leading to uncontrolled vehicle movement and increasing the risk of accidents. Summary of the Invention

[0004] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a safety control system for aerial work platforms, which solves the problem that aerial work platforms are prone to accidents when multi-way valves become stuck.

[0005] The present invention also provides a safety control method for aerial work platforms and an aerial work platform.

[0006] A safety control system for aerial work platforms according to a first aspect of the present invention includes:

[0007] The oil tank is connected to the system's return oil port;

[0008] A hydraulic pump, the oil inlet of which is connected to the oil tank and the oil outlet of which is connected to the system oil inlet;

[0009] A variable amplitude control valve assembly, the oil inlet of which is connected to the oil inlet of the system;

[0010] A telescopic control valve assembly, the oil inlet of which is connected to the oil inlet of the system;

[0011] A rotary control valve assembly, the oil inlet of which is connected to the oil inlet of the system;

[0012] The boom luffing cylinder is connected to the oil outlet of the luffing control valve assembly;

[0013] The boom telescopic cylinder is connected to the oil outlet of the telescopic control valve assembly;

[0014] The rotary table motor is connected to the oil outlet of the rotary control valve assembly;

[0015] A three-way flow valve is connected between the system inlet and the system outlet.

[0016] The first unloading valve is connected to the system's return port;

[0017] The hydraulic detection module is used to detect the pressure at the oil inlet of the system;

[0018] Boom luffing detection module, used to detect boom luffing angle;

[0019] Boom extension detection module, used to detect the extension length of the boom;

[0020] The control module is electrically connected to the first unloading valve, the luffing control valve group, the telescopic control valve group, the slewing control valve group, the hydraulic detection module, the boom luffing detection module, and the boom telescopic detection module, respectively.

[0021] The safety control system for aerial work vehicles according to embodiments of the present invention has at least the following beneficial effects:

[0022] By using the control module to activate the hydraulic pump and the first unloading valve, system oil pressure is established, opening the channels for oil to enter each actuator. This allows oil to flow into the luffing control valve group, telescopic control valve group, and slewing control valve group to drive the boom luffing cylinder, boom telescopic cylinder, and turntable slewing motor, thus executing various vehicle movements. A hydraulic detection module monitors the system oil pressure, and boom luffing and telescopic detection modules detect changes in boom movement. If a hydraulic pump malfunction causes excessive pressure or a control valve group malfunction causes accidental boom movement, the hydraulic pump is shut down to prevent pressure build-up at the actuator ports. Simultaneously, the first unloading valve is closed to promptly release excess flow in the system. Therefore, by utilizing the aerial work platform safety control system of this invention, uncontrolled vehicle movements caused by malfunctions or abnormalities in the directional valve or oil source are effectively prevented, ensuring the safety of workers.

[0023] According to some embodiments of the present invention, the safety control system for aerial work platforms further includes an enabling valve, which is connected to the system oil inlet and electrically connected to the control module.

[0024] According to some embodiments of the present invention, the safety control system for the aerial work vehicle further includes a second unloading valve, which is connected to the oil outlet of the rotary control valve assembly and is electrically connected to the control module.

[0025] According to some embodiments of the present invention, the amplitude control valve assembly includes:

[0026] The first directional valve has a first oil inlet, a first oil outlet, and a second oil outlet, wherein the first oil inlet is connected to the system oil inlet.

[0027] The first bidirectional balance valve has a first oil port, a second oil port, a third oil port, and a fourth oil port. The first oil port is connected to the first oil outlet, the second oil port is connected to the second oil outlet, the third oil port is connected to the rodless chamber of the boom luffing cylinder, and the fourth oil port is connected to the rod chamber of the boom luffing cylinder.

[0028] According to some embodiments of the present invention, the telescopic control valve assembly includes:

[0029] The second directional valve has a second oil inlet, a third oil outlet, and a fourth oil outlet, wherein the second oil inlet is connected to the system oil inlet.

[0030] The second bidirectional balance valve has a fifth oil port, a sixth oil port, a seventh oil port, and an eighth oil port. The fifth oil port is connected to the third oil outlet, the sixth oil port is connected to the fourth oil outlet, the seventh oil port is connected to the rodless chamber of the boom telescopic cylinder, and the eighth oil port is connected to the rod chamber of the boom telescopic cylinder.

[0031] According to some embodiments of the present invention, the rotary control valve assembly includes:

[0032] The third directional valve has a third oil inlet, a fifth oil outlet, and a sixth oil outlet, wherein the third oil inlet is connected to the system oil inlet.

[0033] The third bidirectional balance valve has a ninth oil port, a tenth oil port, an eleventh oil port, and a twelfth oil port. The ninth oil port is connected to the fifth oil outlet, the tenth oil port is connected to the sixth oil outlet, and the eleventh and twelfth oil ports are respectively connected to two oil ports of the rotary motor of the turntable. The second unloading valve is connected between the eleventh and twelfth oil ports.

[0034] A safety control method for aerial work platforms according to a second aspect of the present invention, applied to a safety control system for aerial work platforms as described in any of the first aspect embodiments of the present invention, includes the following steps:

[0035] The hydraulic pump and the first unloading valve are activated to establish system oil circuit pressure;

[0036] When the luffing control valve group, the telescopic control valve group, and the slewing control valve group are not opened and the pressure value at the system inlet is detected to be greater than the first pressure threshold, or when a command to open the luffing control valve group is issued but a change in the boom telescopic length is detected, or when a command to open the telescopic control valve group is issued but a change in the boom luffing angle is detected, the hydraulic pump and the first unloading valve are shut down. The pressure value at the system inlet is collected by the hydraulic detection module, the change in the boom luffing angle is collected by the boom luffing detection module, and the change in the boom telescopic length is collected by the boom telescopic detection module. The first pressure threshold represents the spring set pressure value of the three-way flow valve.

[0037] The safety control method for aerial work platforms according to embodiments of the present invention has at least the following beneficial effects:

[0038] By executing the corresponding safety control method on the aerial work platform safety control system of this invention, the control module activates the hydraulic pump and the first unloading valve, thereby establishing system oil pressure. The channels for oil to enter each actuator open, allowing oil to flow into the luffing control valve group, telescopic control valve group, and slewing control valve group to drive the boom luffing cylinder, boom telescopic cylinder, and turntable slewing motor, thus executing various vehicle movements. The hydraulic detection module detects the oil pressure in the system, and the boom luffing detection module and boom telescopic detection module detect changes in the vehicle's boom movement. If a hydraulic pump malfunction causes excessive pressure or a control valve group malfunction causes false triggering of boom movement, the hydraulic pump is shut down to prevent pressure build-up at the actuator ports. Simultaneously, the first unloading valve is closed to promptly release the flow in the system. Therefore, by utilizing the aerial work platform safety control method of this invention, the uncontrolled vehicle movement caused by malfunctions or abnormalities in the directional valve or oil source is effectively prevented, ensuring the safety of workers.

[0039] According to some embodiments of the present invention, the safety control system for the aerial work vehicle further includes an enabling valve connected to the system oil inlet, and the second unloading valve is electrically connected to the control module;

[0040] The safety control method for aerial work vehicles also includes the following steps:

[0041] The hydraulic pump, the first unloading valve, and the enabling valve are activated to establish system oil circuit pressure.

[0042] When the luffing control valve group, the telescopic control valve group, and the slewing control valve group are not opened and the pressure value at the system inlet is detected to be greater than the second pressure threshold, or when a command to open the luffing control valve group is issued but a change in the boom telescopic length is detected, or when a command to open the telescopic control valve group is issued but a change in the boom luffing angle is detected, the enabling valve and the first unloading valve are closed to allow the three-way flow valve to open. The pressure value at the system inlet is collected by the hydraulic detection module, the change in the boom luffing angle is collected by the boom luffing detection module, and the change in the boom telescopic length is collected by the boom telescopic detection module. The second pressure threshold represents the standby pressure value of the hydraulic pump.

[0043] According to some embodiments of the present invention, the safety control system for the aerial work vehicle further includes a second unloading valve, which is connected to the oil outlet of the rotary control valve assembly and is electrically connected to the control module.

[0044] The safety control method for aerial work vehicles also includes the following steps:

[0045] When the rotary control valve group is closed, the second unloading valve is closed to perform unloading;

[0046] When the rotary control valve assembly is opened, the second unloading valve is opened to stop unloading.

[0047] According to a third aspect embodiment of the present invention, an aerial work platform includes an aerial work platform body and a safety control system for aerial work platforms as described in any of the first aspect embodiments of the present invention.

[0048] The aerial work platform vehicle according to embodiments of the present invention has at least the following beneficial effects:

[0049] By installing the aerial work platform safety control system of this invention on the aerial work platform vehicle body, the control module can activate the hydraulic pump and the first unloading valve, thereby establishing system oil pressure. The channels for oil to enter each actuator are opened, allowing oil to flow into the luffing control valve group, telescopic control valve group, and slewing control valve group to drive the boom luffing cylinder, boom telescopic cylinder, and turntable slewing motor to execute various vehicle movements. A hydraulic detection module detects the oil pressure in the system, and boom luffing and telescopic detection modules detect changes in the vehicle's boom movement. If a hydraulic pump malfunction causes excessive pressure or a control valve group malfunction causes false triggering of boom movement, the hydraulic pump is shut down to prevent pressure build-up at the actuator ports, and the first unloading valve is simultaneously closed to promptly release the flow in the system. Therefore, by using the aerial work platform vehicle of this invention, the uncontrolled vehicle movement caused by malfunctions or abnormalities in the directional valve or oil source is effectively prevented, ensuring the safety of workers.

[0050] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. Attached Figure Description

[0051] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0052] Figure 1 This is a schematic diagram of the structure of a safety control system for an aerial work vehicle according to an embodiment of the present invention;

[0053] Figure 2 This is a schematic diagram of the structure of a safety control system for an aerial work vehicle according to another embodiment of the present invention;

[0054] Figure 3 This is a flowchart of a safety control method for an aerial work platform vehicle according to an embodiment of the present invention;

[0055] Figure 4 This is a flowchart of a safety control method for aerial work platforms according to another embodiment of the present invention.

[0056] Figure label:

[0057] Fuel tank capacity: 100;

[0058] Hydraulic pump 200;

[0059] 310 boom luffing cylinder; 320 boom telescopic cylinder; 330 turntable slewing motor;

[0060] Three-way flow valve 410; First unloading valve 420; Enable valve 430; Second unloading valve 440;

[0061] Hydraulic detection module 510; boom luffing detection module 520; boom telescopic detection module 530;

[0062] Control module 600;

[0063] First directional valve 710; First bidirectional balance valve 720;

[0064] Second directional valve 810; Second bidirectional balance valve 820;

[0065] Third directional valve 910; Third bidirectional balance valve 920. Detailed Implementation

[0066] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals characterize the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0067] In the description of this invention, the use of terms such as "first," "second," etc., is for the purpose of distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features indicated, or implicitly indicating the order of the technical features indicated.

[0068] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0069] In the description of this invention, it should be noted that, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0070] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are some embodiments of the present invention, not all embodiments.

[0071] See Figure 1The diagram shown is a structural schematic of a safety control system for an aerial work platform provided in an embodiment of the present invention. The system includes: an oil tank 100, a hydraulic pump 200, a luffing control valve group, a telescopic control valve group, a slewing control valve group, a boom luffing cylinder 310, a boom telescopic cylinder 320, a turntable slewing motor 330, a three-way flow valve 410, a first unloading valve 420, a hydraulic detection module 510, a boom luffing detection module 520, a boom telescopic detection module 530, and a control module 600. Oil tank 100 is connected to the system return port; the inlet of hydraulic pump 200 is connected to oil tank 100, and its outlet is connected to the system inlet; the inlet of the luffing control valve assembly is connected to the system inlet; the inlet of the telescopic control valve assembly is connected to the system inlet; the inlet of the slewing control valve assembly is connected to the system inlet; the boom luffing cylinder 310 is connected to the outlet of the luffing control valve assembly; the boom telescopic cylinder 320 is connected to the outlet of the telescopic control valve assembly; the turntable slewing motor 330 is connected to the outlet of the slewing control valve assembly; and a three-way flow valve 410 is also connected. The system is connected between the system inlet and the system outlet; the first unloading valve 420 is connected to the system outlet; the hydraulic detection module 510 is used to detect the pressure at the system inlet; the boom luffing detection module 520 is used to detect the boom luffing angle; the boom telescopic detection module 530 is used to detect the boom telescopic length; the control module 600 is electrically connected to the first unloading valve 420, the luffing control valve group, the telescopic control valve group, the slewing control valve group, the hydraulic detection module 510, the boom luffing detection module 520, and the boom telescopic detection module 530 respectively.

[0072] Specifically, such as Figure 1 As shown, it can be understood that the safety control system of this embodiment of the invention is a hydraulic system. The basic principle is to use a hydraulic pump 200 to drive the oil in the oil tank 100 to the system pipeline. The hydraulic pump 200 can be driven by an electric motor or engine. By controlling different valves, corresponding oil circuit pressures can be established, thereby ultimately realizing the actions of each actuator.

[0073] In some embodiments, the hydraulic pump 200 can be a fixed displacement pump. When the control module 600 receives a work command, it controls the start of the electric motor or engine to drive the hydraulic pump 200, and opens the first unloading valve 420, while the three-way flow valve 410 is closed, thus opening the passage between the hydraulic pump 200 and each control valve group. Further, when the control module 600 receives an execution command for boom luffing, telescopicing, or slewing, it correspondingly controls the opening of the luffing control valve group, telescopic control valve group, or slewing control valve group, so that hydraulic fluid can enter the corresponding control valve group. (Continue to refer to...) Figure 1The dashed line connects the load-sensitive (LS) oil circuit, which feeds back the load pressure to the three-way flow valve 410 to build up pressure, thereby causing the boom luffing cylinder 310, boom telescopic cylinder 320, or turntable slewing motor 330 to work accordingly, ultimately realizing the boom luffing, telescopic, or turntable slewing actions.

[0074] Furthermore, when the control module 600 does not receive execution commands for boom luffing, telescopicing, or turntable rotation, and the hydraulic detection module 510 detects that the pressure value at the system inlet is greater than the spring set pressure value of the three-way flow valve 410, it indicates that the hydraulic pump 200 is abnormal or malfunctioning. Therefore, the control module 600 will control the shutdown of the electric motor or engine to stop the hydraulic pump 200 from working and close the first unloading valve 420. On the one hand, this prevents the hydraulic pump 200 from continuing to inject oil into the system, and on the other hand, it causes the first unloading valve 420 to release the flow in the system. This utilizes multiple redundant protections to prevent uncontrolled vehicle actions and pipeline leaks from occurring.

[0075] Furthermore, when the control module 600 receives the boom luffing execution command but the boom extension detection module 530 detects a change in the boom extension length, or when the control module 600 receives the boom extension execution command but the boom luffing detection module 520 detects a change in the boom luffing angle, it indicates that the luffing control valve group or the extension control valve group has malfunctioned or failed. Therefore, the control module 600 will control the shutdown of the electric motor or engine to stop the hydraulic pump 200 from working and close the first unloading valve 420. On the one hand, this prevents the hydraulic pump 200 from continuing to inject oil into the system, and on the other hand, it causes the first unloading valve 420 to release the flow in the system. This utilizes multiple redundant protections to prevent the vehicle from performing actions uncontrollably and to prevent pipeline leaks and other hazards.

[0076] In some embodiments, the hydraulic detection module 510 may be a pressure sensor, the boom luffing detection module 520 may be an angle sensor, the boom telescopic detection module 530 may be a length sensor, and the control module 600 may be a PLC programmable logic controller.

[0077] In this embodiment, the hydraulic pump 200 and the first unloading valve 420 are activated by the control module 600, thereby establishing system oil pressure. The channels for oil to enter each actuator are opened, allowing oil to enter the luffing control valve group, telescopic control valve group, and slewing control valve group to drive the boom luffing cylinder 310, boom telescopic cylinder 320, and turntable slewing motor 330 to execute various vehicle actions. The hydraulic detection module 510 detects the oil pressure in the system, and the boom luffing detection module 520 and boom telescopic detection module 530 detect changes in the vehicle boom's movement. If the hydraulic pump 200 malfunctions, causing excessive pressure, or if the control valve group malfunctions, causing false triggering of boom movement, the hydraulic pump 200 is shut down to prevent pressure build-up at the actuator's oil port. Simultaneously, the first unloading valve 420 is closed to promptly release the flow in the system. Therefore, by utilizing the safety control system for aerial work vehicles according to the embodiments of the present invention, the situation where the vehicle's movements become uncontrollable due to malfunctions or abnormalities in the reversing valve or oil source is effectively prevented, thus ensuring the safety of workers during construction.

[0078] In some embodiments, such as Figure 2 As shown, the safety control system for aerial work platforms also includes an enable valve 430, which is connected to the system oil inlet and electrically connected to the control module 600.

[0079] Specifically, refer to Figure 2 It should be noted that in some embodiments, the hydraulic pump 200 can be a variable displacement pump. When the control module 600 receives a work command, it controls the hydraulic pump 200, the first unloading valve 420, and the enabling valve 430 to open, while the three-way flow valve 410 is closed, thus opening the passage between the hydraulic pump 200 and each control valve group. Furthermore, when the control module 600 receives an execution command for boom luffing, telescopicing, or slewing, it correspondingly controls the opening of the luffing control valve group, telescopic control valve group, or slewing control valve group, allowing hydraulic fluid to enter each control valve group accordingly. (Continue to refer to...) Figure 1 The dashed line connects the two parts of the load-sensitive (LS) oil circuit. When the first unloading valve 420 is energized and operates in the left position, the load pressure is fed back to the variable pump to build up pressure, thereby causing the boom luffing cylinder 310, boom telescopic cylinder 320 or turntable slewing motor 330 to work accordingly, ultimately realizing the boom luffing, telescopic or turntable slewing actions.

[0080] Furthermore, when the control module 600 does not receive execution commands for boom luffing, telescopic, or turntable rotation, and the hydraulic detection module 510 detects that the pressure value at the system inlet is greater than the standby pressure value of the load-sensitive variable pump, it indicates that the hydraulic pump 200 is abnormal or malfunctioning. Therefore, the control module 600 will control the close enable valve 430 to automatically open the three-way flow valve 410 after the hydraulic value reaches the set value, so as to release the flow at the system inlet, and close the first unloading valve 420 to release the flow at the system return port. This utilizes multiple redundant protections to prevent the vehicle's actions from becoming uncontrollable and to prevent pipeline leaks and other hazards.

[0081] Furthermore, when the control module 600 receives the boom luffing execution command but the boom extension detection module 530 detects a change in the boom extension length, or when the control module 600 receives the boom extension execution command but the boom luffing detection module 520 detects a change in the boom luffing angle, it indicates that the luffing control valve group or the extension control valve group has malfunctioned or failed. Therefore, the control module 600 will control the close enable valve 430 so that the hydraulic value at the three-way flow valve 410 automatically opens after reaching the set value to release the flow at the system inlet, and close the first unloading valve 420 to release the flow at the system return port. This utilizes multiple redundant protections to prevent uncontrolled vehicle actions and pipeline leaks from occurring.

[0082] In this embodiment, by setting an enable valve 430 between the system oil inlet and the control valve group of each actuator, an interlock can be formed between the enable valve 430 and the control valve group. Therefore, in the event of an abnormality or malfunction, it is only necessary to control and close the enable valve 430 to prevent the vehicle from moving out of control, without having to completely stop the hydraulic pump 200, so as to avoid unnecessary damage caused by the frequent switching of the hydraulic pump 200.

[0083] In some embodiments, such as Figure 1 or Figure 2 As shown, the safety control system for aerial work platforms also includes a second unloading valve 440, which is connected to the oil outlet of the rotary control valve assembly and is electrically connected to the control module 600.

[0084] Specifically, refer to Figure 1 or Figure 2It should be noted that if the control module 600 does not receive an execution command for turntable rotation but the turntable rotates, it indicates that the turntable control valve group has malfunctioned or is abnormal. Since no detection module is set to detect the turntable rotation, the control module 600 cannot make a judgment to perform safety control. To address this issue, this embodiment sets a second unloading valve 440 at the oil outlet of the turntable control valve group. When the turntable control valve group needs to be closed, the second unloading valve 440 is closed to maintain unloading in a constantly open state. This prevents the working oil port of the turntable control valve group from building pressure if a malfunction occurs, thereby preventing the vehicle from rotating and ensuring the safety of relevant personnel. When the turntable control valve group needs to be opened, the second unloading valve 440 is opened to stop unloading, allowing the working oil port of the turntable control valve group to build pressure normally.

[0085] Understandably, by using the second unloading valve 440 to protect the slewing action, an additional layer of redundant protection is added to the slewing action, avoiding malfunctions in the slewing action caused by the slewing valve core jamming, which could affect the safety of the entire vehicle.

[0086] In some embodiments, such as Figure 1 or Figure 2 As shown, the luffing control valve group includes: a first directional valve 710 and a first bidirectional balance valve 720. The first directional valve 710 has a first oil inlet, a first oil outlet, and a second oil outlet, with the first oil inlet connected to the system oil inlet; the first bidirectional balance valve 720 has a first oil port, a second oil port, a third oil port, and a fourth oil port, with the first oil port connected to the first oil outlet, the second oil port connected to the second oil outlet, the third oil port connected to the rodless chamber of the boom luffing cylinder 310, and the fourth oil port connected to the rod chamber of the boom luffing cylinder 310.

[0087] Specifically, refer to Figure 1 or Figure 2 It is understandable that by using the first directional valve 710, the pressure oil control direction of the boom luffing cylinder 310 can be switched, thereby controlling the boom luffing action; by using the first bidirectional balance valve 720, the smoothness of the boom luffing action can be ensured.

[0088] In some embodiments, such as Figure 1 or Figure 2 As shown, the telescopic control valve assembly includes: a second directional valve 810 and a second bidirectional balance valve 820. The second directional valve 810 has a second oil inlet, a third oil outlet, and a fourth oil outlet, with the second oil inlet connected to the system oil inlet; the second bidirectional balance valve 820 has a fifth oil port, a sixth oil port, a seventh oil port, and an eighth oil port, with the fifth oil port connected to the third oil outlet, the sixth oil port connected to the fourth oil outlet, the seventh oil port connected to the rodless chamber of the boom telescopic cylinder 320, and the eighth oil port connected to the rod chamber of the boom telescopic cylinder 320.

[0089] Specifically, refer to Figure 1 or Figure 2 It is understandable that by using the second directional valve 810, the pressure oil control direction of the boom telescopic cylinder 320 can be switched, thereby controlling the boom telescopic action; by using the first bidirectional balance valve 720, the smoothness of the boom telescopic action can be ensured.

[0090] In some embodiments, such as Figure 1 or Figure 2 As shown, the rotary control valve group includes: a third directional valve 910 and a third bidirectional balance valve 920. The third directional valve 910 has a third oil inlet, a fifth oil outlet, and a sixth oil outlet, with the third oil inlet connected to the system oil inlet; the third bidirectional balance valve 920 has a ninth oil port, a tenth oil port, an eleventh oil port, and a twelfth oil port, with the ninth oil port connected to the fifth oil outlet, the tenth oil port connected to the sixth oil outlet, and the eleventh and twelfth oil ports respectively connected to two oil ports of the rotary motor 330; a second unloading valve 440 is connected between the eleventh and twelfth oil ports.

[0091] Specifically, refer to Figure 1 or Figure 2 It is understandable that by using the third directional valve 910, the pressure oil control direction of the turntable rotary motor 330 can be switched, thereby controlling the rotary motion of the turntable; by using the third bidirectional balance valve 920, the smoothness of the rotary motion of the turntable can be ensured.

[0092] In addition, such as Figure 3 As shown, this embodiment of the invention also provides a safety control method for aerial work platforms, applied to a safety control system for aerial work platforms as described in any of the first aspect embodiments of the invention, comprising the following steps:

[0093] Start the hydraulic pump 200 and the first unloading valve 420 to establish system oil circuit pressure;

[0094] When the luffing control valve group, telescopic control valve group, and slewing control valve group are not opened and the pressure value at the system inlet is detected to be greater than the first pressure threshold, or when a command to open the luffing control valve group is issued but a change in the boom telescopic length is detected, or when a command to open the telescopic control valve group is issued but a change in the boom luffing angle is detected, the hydraulic pump 200 and the first unloading valve 420 are shut down. The pressure value at the system inlet is collected by the hydraulic detection module 510, the change in the boom luffing angle is collected by the boom luffing detection module 520, and the change in the boom telescopic length is collected by the boom telescopic detection module 530. The first pressure threshold represents the spring setting pressure value of the three-way flow valve 410.

[0095] Specifically, refer to Figure 3 and combined Figure 1It is understood that the aerial work vehicle safety control system of this embodiment is used to implement the above-mentioned aerial work vehicle safety control method. The aerial work vehicle safety control method of this embodiment corresponds to the aforementioned aerial work vehicle safety control system. For the specific processing procedure, please refer to the aforementioned aerial work vehicle safety control system, which will not be repeated here.

[0096] In this embodiment, by executing the corresponding safety control method on the aerial work platform safety control system of this invention, the control module 600 is used to open the hydraulic pump 200 and the first unloading valve 420, thereby establishing system oil circuit pressure. The channels for oil to enter each actuator are opened, allowing oil to enter the luffing control valve group, telescopic control valve group, and slewing control valve group respectively to drive the boom luffing cylinder 310, boom telescopic cylinder 320, and turntable slewing motor 330 to execute various vehicle actions. The hydraulic detection module 510 is used to detect the oil pressure in the system, and the boom luffing detection module 520 and boom telescopic detection module 530 are used to detect changes in the vehicle boom action. If the hydraulic pump 200 malfunctions and causes the pressure to exceed the standard, or if the control valve group malfunctions and causes the boom action to be falsely triggered, the hydraulic pump 200 is shut down to prevent pressure from being built at the actuator oil port. At the same time, the first unloading valve 420 is shut down to promptly release the flow in the system. Therefore, by utilizing the safety control method for aerial work platforms according to the embodiments of the present invention, the situation where the vehicle's movements become uncontrollable due to malfunctions or abnormalities in the reversing valve or oil source is effectively prevented, thus ensuring the safety of workers during construction.

[0097] In some embodiments, such as Figure 2 and Figure 4 As shown, the safety control system for aerial work platforms also includes an enable valve 430, which is connected to the system oil inlet and electrically connected to the control module 600.

[0098] The safety control methods for aerial work platforms also include the following steps:

[0099] Start the hydraulic pump 200, the first unloading valve 420 and the enabling valve 430 to establish system oil circuit pressure;

[0100] When the luffing control valve group, telescopic control valve group, and slewing control valve group are not opened and the pressure value at the system inlet is detected to be greater than the second pressure threshold, or when a command to open the luffing control valve group is issued but a change in boom telescopic length is detected, or when a command to open the telescopic control valve group is issued but a change in boom luffing angle is detected, the enable valve 430 and the first unloading valve 420 are closed to allow the three-way flow valve 410 to open. The pressure value at the system inlet is collected by the hydraulic detection module 510, the change in boom luffing angle is collected by the boom luffing detection module 520, and the change in boom telescopic length is collected by the boom telescopic detection module 530. The second pressure threshold represents the standby pressure value of the hydraulic pump 200.

[0101] Specifically, refer to Figure 2 and Figure 4 It should be noted that the aerial work vehicle safety control system of this embodiment also includes an enable valve 430, which is used to implement the above-mentioned aerial work vehicle safety control method using the enable valve 430. The aerial work vehicle safety control method of this embodiment corresponds to the aforementioned aerial work vehicle safety control system. For the specific processing procedure, please refer to the aforementioned aerial work vehicle safety control system, which will not be repeated here.

[0102] In some embodiments, such as Figure 1 or Figure 2 As shown, the safety control system for aerial work platforms also includes a second unloading valve 440, which is connected to the oil outlet of the rotary control valve group and is electrically connected to the control module 600.

[0103] The safety control methods for aerial work platforms also include the following steps:

[0104] When the rotary control valve group is closed, the second unloading valve 440 is closed to unload the load.

[0105] When the rotary control valve assembly is opened, the second unloading valve 440 is opened to stop unloading.

[0106] Specifically, refer to Figure 1 or Figure 2 It should be noted that the aerial work vehicle safety control system of this embodiment also includes a second unloading valve 440, which is used to implement the above-mentioned aerial work vehicle safety control method using the second unloading valve 440. The aerial work vehicle safety control method of this embodiment corresponds to the aforementioned aerial work vehicle safety control system. For the specific processing procedure, please refer to the aforementioned aerial work vehicle safety control system, which will not be repeated here.

[0107] In addition, embodiments of the present invention also provide an aerial work platform vehicle, including an aerial work platform vehicle body and a safety control system for aerial work platforms as described in any of the embodiments of the first aspect of the present invention.

[0108] Specifically, it is understood that in some embodiments, the aerial work platform is equipped with operating devices such as foot switches and operating handles. The work instructions and execution instructions received by the control module 600 are issued by the operator after operating the foot switches, operating handles and other operating devices, so that the safety control system for the aerial work platform can perform work on the aerial work platform.

[0109] It is understood that by installing the aerial work platform safety control system of this embodiment on the aerial work platform body, the control module 600 can be used to open the hydraulic pump 200 and the first unloading valve 420, thereby establishing system oil circuit pressure. The channels for oil to enter each actuator are opened, allowing oil to enter the luffing control valve group, the telescopic control valve group, and the slewing control valve group to drive the boom luffing cylinder 310, the boom telescopic cylinder 320, and the turntable slewing motor 330 to execute various vehicle actions. The hydraulic detection module 510 is used to detect the oil pressure in the system, and the boom luffing detection module 520 and the boom telescopic detection module 530 are used to detect changes in the vehicle boom action. If the hydraulic pump 200 fails, causing the pressure to exceed the standard, or if the control valve group fails, causing the boom action to be falsely triggered, the hydraulic pump 200 is shut down to prevent pressure from being built at the actuator oil port. At the same time, the first unloading valve 420 is shut down to promptly release the flow in the system. Therefore, by utilizing the aerial work platform according to the embodiments of the present invention, the situation where the vehicle's movement becomes uncontrollable due to malfunctions or abnormalities in the reversing valve or oil source is effectively prevented, thus ensuring the safety of the workers during construction.

[0110] It will be understood by those skilled in the art that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components can be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include computer storage media (or non-transitory media) and communication media (or transient media). As is known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and is accessible to a computer. Furthermore, as is known to those skilled in the art, communication media typically contain computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0111] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A safety control method for aerial work platforms, applied to the safety control system of aerial work platforms, characterized in that, The safety control system for the aerial work vehicle includes: The oil tank is connected to the system's return oil port; A hydraulic pump, the oil inlet of which is connected to the oil tank and the oil outlet of which is connected to the system oil inlet; A variable amplitude control valve assembly, the oil inlet of which is connected to the oil inlet of the system; A telescopic control valve assembly, the oil inlet of which is connected to the oil inlet of the system; A rotary control valve assembly, the oil inlet of which is connected to the oil inlet of the system; The boom luffing cylinder is connected to the oil outlet of the luffing control valve assembly; The boom telescopic cylinder is connected to the oil outlet of the telescopic control valve assembly; The rotary table motor is connected to the oil outlet of the rotary control valve assembly; A three-way flow valve is connected between the system inlet and the system outlet. The first unloading valve is connected to the system's return port; The hydraulic detection module is used to detect the pressure at the oil inlet of the system; Boom luffing detection module, used to detect boom luffing angle; Boom extension detection module, used to detect the extension length of the boom; The control module is electrically connected to the first unloading valve, the luffing control valve group, the telescopic control valve group, the slewing control valve group, the hydraulic detection module, the boom luffing detection module, and the boom telescopic detection module, respectively. The safety control method for aerial work vehicles includes the following steps: The hydraulic pump and the first unloading valve are activated to establish system oil circuit pressure; When the luffing control valve group, the telescopic control valve group, and the slewing control valve group are not opened and the pressure value at the system inlet is detected to be greater than the first pressure threshold, or when a command to open the luffing control valve group is issued but a change in the boom telescopic length is detected, or when a command to open the telescopic control valve group is issued but a change in the boom luffing angle is detected, the hydraulic pump and the first unloading valve are shut down. The pressure value at the system inlet is collected by the hydraulic detection module, the change in the boom luffing angle is collected by the boom luffing detection module, and the change in the boom telescopic length is collected by the boom telescopic detection module. The first pressure threshold represents the spring set pressure value of the three-way flow valve.

2. The safety control method for aerial work platforms according to claim 1, characterized in that, The safety control system for the aerial work vehicle also includes an enabling valve, which is connected to the system's oil inlet and electrically connected to the control module. The safety control method for aerial work vehicles also includes the following steps: The hydraulic pump, the first unloading valve, and the enabling valve are activated to establish system oil circuit pressure. When the luffing control valve group, the telescopic control valve group, and the slewing control valve group are not opened and the pressure value at the system inlet is detected to be greater than the second pressure threshold, or when a command to open the luffing control valve group is issued but a change in the boom telescopic length is detected, or when a command to open the telescopic control valve group is issued but a change in the boom luffing angle is detected, the enabling valve and the first unloading valve are closed to allow the three-way flow valve to open. The pressure value at the system inlet is collected by the hydraulic detection module, the change in the boom luffing angle is collected by the boom luffing detection module, and the change in the boom telescopic length is collected by the boom telescopic detection module. The second pressure threshold represents the standby pressure value of the hydraulic pump.

3. The safety control method for aerial work platforms according to claim 1 or 2, characterized in that, The safety control system for the aerial work vehicle also includes a second unloading valve, which is connected to the oil outlet of the rotary control valve group and is electrically connected to the control module. The safety control method for aerial work vehicles also includes the following steps: When the rotary control valve group is closed, the second unloading valve is closed to perform unloading; When the rotary control valve assembly is opened, the second unloading valve is opened to stop unloading.

4. The safety control method for aerial work platforms according to claim 1, characterized in that, The amplitude control valve group includes: The first directional valve has a first oil inlet, a first oil outlet, and a second oil outlet, wherein the first oil inlet is connected to the system oil inlet. The first bidirectional balance valve has a first oil port, a second oil port, a third oil port, and a fourth oil port. The first oil port is connected to the first oil outlet, the second oil port is connected to the second oil outlet, the third oil port is connected to the rodless chamber of the boom luffing cylinder, and the fourth oil port is connected to the rod chamber of the boom luffing cylinder.

5. The safety control method for aerial work platforms according to claim 1, characterized in that, The telescopic control valve assembly includes: The second directional valve has a second oil inlet, a third oil outlet, and a fourth oil outlet, wherein the second oil inlet is connected to the system oil inlet. The second bidirectional balance valve has a fifth oil port, a sixth oil port, a seventh oil port, and an eighth oil port. The fifth oil port is connected to the third oil outlet, the sixth oil port is connected to the fourth oil outlet, the seventh oil port is connected to the rodless chamber of the boom telescopic cylinder, and the eighth oil port is connected to the rod chamber of the boom telescopic cylinder.

6. The safety control method for aerial work platforms according to claim 3, characterized in that, The rotary control valve assembly includes: The third directional valve has a third oil inlet, a fifth oil outlet, and a sixth oil outlet, wherein the third oil inlet is connected to the system oil inlet. The third bidirectional balance valve has a ninth oil port, a tenth oil port, an eleventh oil port, and a twelfth oil port. The ninth oil port is connected to the fifth oil outlet, the tenth oil port is connected to the sixth oil outlet, and the eleventh and twelfth oil ports are respectively connected to two oil ports of the rotary motor of the turntable. The second unloading valve is connected between the eleventh and twelfth oil ports.

7. An aerial work platform vehicle, characterized in that, The system includes an aerial work platform vehicle body and an aerial work platform vehicle safety control system, wherein the aerial work platform vehicle safety control method as described in any one of claims 1 to 6 is applied to the aerial work platform vehicle safety control system.

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