CN219299651U

CN219299651U - Safety control system for overhead working truck and overhead working truck

Info

Publication number: CN219299651U
Application number: CN202320487498.3U
Authority: CN
Inventors: 刘国良; 石伟; 杜昌辉
Original assignee: Hunan Sinoboom Intelligent Equipment Co Ltd
Current assignee: Hunan Sinoboom Intelligent Equipment Co Ltd
Priority date: 2023-03-14
Filing date: 2023-03-14
Publication date: 2023-07-04
Anticipated expiration: 2033-03-14

Abstract

The utility model discloses a safety control system for an overhead working truck and the overhead working truck. For the safety control system for the overhead working truck, provided by the embodiment of the utility model, once the hydraulic pump fails to cause the pressure exceeding or the control valve group fails to cause the false triggering of the arm support to act, the hydraulic pump is controlled to be closed so that the pressure cannot be built at the oil port of the actuating mechanism, and meanwhile, the first unloading valve is controlled to be closed so as to timely unload the flow in the system, so that the situation that the action of the truck is uncontrolled when the reversing valve or the oil source fails or is abnormal is effectively prevented, and the construction safety of workers is ensured.

Description

Safety control system for overhead working truck and overhead working truck

Technical Field

The utility model relates to the technical field of overhead working vehicles, in particular to a safety control system for an overhead working vehicle and the overhead working vehicle.

Background

An overhead working truck is a special purpose vehicle for transporting workers and equipment to the high altitude, thereby installing, maintaining and cleaning equipment at the high altitude. Compared with the traditional operation mode, such as a scaffold, a ladder and the like, the overhead working truck has the advantages of good operation performance, high operation efficiency, safe operation and the like, and is widely applied to infrastructure industries such as electric power, traffic, petrochemical industry, communication, gardens and the like.

At present, as the requirement on operation comfort is higher and higher, the overhead working truck is provided with a multi-way valve, and compared with the traditional threaded cartridge valve, the multi-way valve has the advantages of long valve core displacement stroke, wider range of proportion control characteristics, better action operability and comfort, and is more and more favored by host factories and terminal customers. Because the thrust of electromagnetic direct drive is limited, the cleanliness of oil liquid changes after the vehicle is used, and the phenomenon of valve blocking of the multi-way valve can be caused, so that the vehicle is easy to accident due to uncontrolled action.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides a safety control system for the overhead working truck, which solves the problem that the overhead working truck is easy to accident after the valve is blocked by the prior multi-way valve.

The utility model also provides an overhead working truck.

According to an embodiment of the first aspect of the present utility model, a safety control system for an overhead working truck includes:

the oil tank is connected with the system oil return port;

the oil inlet of the hydraulic pump is connected with the oil tank, and the oil outlet of the hydraulic pump is connected with the system oil inlet;

the oil inlet of the amplitude control valve bank is connected with the system oil inlet;

the oil inlet of the telescopic control valve bank is connected with the system oil inlet;

the oil inlet of the rotary control valve group is connected with the system oil inlet;

the arm support amplitude varying oil cylinder is connected with an oil outlet of the amplitude varying control valve group;

the arm support telescopic oil cylinder is connected with an oil outlet of the telescopic control valve group;

the turntable rotary motor is connected with an oil outlet of the rotary control valve group;

the three-way flow valve is connected between the system oil inlet and the system oil return port;

the first unloading valve is connected to the oil return port of the system;

the hydraulic detection module is used for detecting the pressure at the oil inlet of the system;

the arm support amplitude-changing detection module is used for detecting the arm support amplitude-changing angle;

the arm support expansion detection module is used for detecting the expansion length of the arm support;

the control module is respectively and electrically connected with the first unloading valve, the amplitude changing control valve bank, the telescopic control valve bank, the rotation control valve bank, the hydraulic detection module, the arm support amplitude changing detection module and the arm support telescopic detection module.

The safety control system for the overhead working truck, provided by the embodiment of the utility model, has at least the following beneficial effects:

the hydraulic pump and the first unloading valve are opened by utilizing the control module, so that the pressure of a system oil way can be established, and the channels for oil to enter each actuating mechanism are opened, so that the oil can enter the amplitude control valve group, the telescopic control valve group and the rotary control valve group respectively to drive the arm support amplitude cylinder, the arm support telescopic cylinder and the rotary table rotary motor so as to execute each action of a vehicle; the hydraulic pressure in the system is detected by utilizing the hydraulic pressure detection module, the change of the motion of the vehicle arm support is detected by utilizing the arm support amplitude detection module and the arm support expansion detection module, and once the hydraulic pump fails to cause the pressure exceeding standard or the control valve group fails to cause the false triggering of the arm support to move, the hydraulic pump is controlled to be closed so that the oil port of the actuating mechanism cannot build pressure, and meanwhile, the first unloading valve is controlled to be closed to timely unload the flow in the system. Therefore, by utilizing the safety control system for the overhead working truck, which is disclosed by the embodiment of the utility model, the situation that the action of the truck is not controlled when a reversing valve or an oil source is in fault or abnormal is effectively prevented, and the construction safety of workers is ensured.

According to some embodiments of the utility model, the safety control system for an overhead working truck further comprises an enabling valve connected to the system oil inlet, and the enabling valve is electrically connected with the control module.

According to some embodiments of the utility model, the safety control system for an overhead working truck further comprises a second unloading valve, wherein the second unloading valve is connected to an oil outlet of the rotary control valve group, and the second unloading valve is electrically connected with the control module.

According to some embodiments of the utility model, the luffing control valve block comprises:

the first reversing valve is provided with a first oil inlet, a first oil outlet and a second oil outlet, and the first oil inlet is connected with the system oil inlet;

the first bidirectional balance valve is provided with a first oil port, a second oil port, a third oil port and a fourth oil port, wherein the first oil port is connected with the first oil outlet, the second oil port is connected with the second oil outlet, the third oil port is connected with a rodless cavity of the boom luffing cylinder, and the fourth oil port is connected with a rod cavity of the boom luffing cylinder.

According to some embodiments of the utility model, the telescopic control valve block comprises:

the second reversing valve is provided with a second oil inlet, a third oil outlet and a fourth oil outlet, and the second oil inlet is connected with the system oil inlet;

the second bidirectional balance valve is provided with a fifth oil port, a sixth oil port, a seventh oil port and an eighth oil port, wherein the fifth oil port is connected with the third oil outlet, the sixth oil port is connected with the fourth oil outlet, the seventh oil port is connected with a rodless cavity of the boom telescopic oil cylinder, and the eighth oil port is connected with a rod cavity of the boom telescopic oil cylinder.

According to some embodiments of the utility model, the rotary control valve block includes:

the third reversing valve is provided with a third oil inlet, a fifth oil outlet and a sixth oil outlet, and the third oil inlet is connected with the system oil inlet;

the third bidirectional balance valve is provided with a ninth oil port, a tenth oil port, an eleventh oil port and a twelfth oil port, wherein the ninth oil port is connected with the fifth oil outlet, the tenth oil port is connected with the sixth oil outlet, and the eleventh oil port and the twelfth oil port are respectively connected with two oil ports of the turntable rotary motor; the second unloading valve is connected between the eleventh oil port and the twelfth oil port.

An overhead working truck according to an embodiment of the second aspect of the present utility model includes an overhead working truck body and a safety control system for an overhead working truck according to any one of the embodiments of the first aspect of the present utility model.

The overhead working truck provided by the embodiment of the utility model has at least the following beneficial effects:

by loading the safety control system for the overhead working truck, which is disclosed by the embodiment of the utility model, on the overhead working truck body, a hydraulic pump and a first unloading valve are started by using a control module, so that the pressure of a system oil way can be established, and the channels of oil entering each actuating mechanism are opened, so that the oil can enter an amplitude control valve group, a telescopic control valve group and a rotary control valve group respectively to drive an arm support amplitude cylinder, an arm support telescopic cylinder and a rotary table rotary motor so as to execute each action of the truck; the hydraulic pressure in the system is detected by utilizing the hydraulic pressure detection module, the change of the motion of the vehicle arm support is detected by utilizing the arm support amplitude detection module and the arm support expansion detection module, and once the hydraulic pump fails to cause the pressure exceeding standard or the control valve group fails to cause the false triggering of the arm support to move, the hydraulic pump is controlled to be closed so that the oil port of the actuating mechanism cannot build pressure, and meanwhile, the first unloading valve is controlled to be closed to timely unload the flow in the system. Therefore, by utilizing the overhead working truck provided by the embodiment of the utility model, the situation that the action of the truck is not controlled when a reversing valve or an oil source is in fault or abnormal is effectively prevented, and the construction safety of workers is ensured.

Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic diagram of a safety control system for an overhead working truck according to an embodiment of the present utility model;

FIG. 2 is a schematic diagram of a safety control system for an overhead working truck according to another embodiment of the present utility model;

FIG. 3 is a flow chart of a safety control method for an overhead working truck according to one embodiment of the present utility model;

fig. 4 is a flowchart of a safety control method for an overhead working truck according to another embodiment of the present utility model.

Reference numerals:

a fuel tank 100;

a hydraulic pump 200;

boom luffing cylinder 310; boom extension cylinder 320; a turntable rotation motor 330;

a three-way flow valve 410; a first unloader valve 420; enabling the valve 430; a second unloader valve 440;

a hydraulic pressure detection module 510; boom amplitude detection module 520; the boom extension detection module 530;

a control module 600;

a first reversing valve 710; a first two-way balancing valve 720;

a second reversing valve 810; a second two-way balancing valve 820;

a third reversing valve 910; and a third two-way balancing valve 920.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, the description of first, second, etc. is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present utility model, it should be understood that the direction or positional relationship indicated with respect to the description of the orientation, such as up, down, etc., is based on the direction or positional relationship shown in the drawings, is merely for convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the apparatus or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be determined reasonably by a person skilled in the art in combination with the specific content of the technical solution.

The following description of the embodiments of the present utility model will be made with reference to the accompanying drawings, in which it is apparent that the embodiments described below are some, but not all embodiments of the utility model.

Referring to fig. 1, a schematic structural diagram of a safety control system for an overhead working truck according to an embodiment of the present utility model is shown, where the system includes: the hydraulic system comprises an oil tank 100, a hydraulic pump 200, a luffing control valve bank, a telescopic control valve bank, a rotation control valve bank, a boom luffing cylinder 310, a boom telescopic cylinder 320, a turntable rotation 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. The oil tank 100 is connected with a system oil return port; an oil inlet of the hydraulic pump 200 is connected with the oil tank 100, and an oil outlet is connected with a system oil inlet; an oil inlet of the amplitude control valve bank is connected with a system oil inlet; an oil inlet of the telescopic control valve bank is connected with a system oil inlet; an oil inlet of the rotary control valve group is connected with a system oil inlet; the arm support amplitude variation oil cylinder 310 is connected with an oil outlet of the amplitude variation control valve group; the arm support telescopic oil cylinder 320 is connected with an oil outlet of the telescopic control valve group; the turntable rotary motor 330 is connected with an oil outlet of the rotary control valve group; the three-way flow valve 410 is connected between the system oil inlet and the system oil return port; the first unloading valve 420 is connected to the system oil return port; the hydraulic detection module 510 is used for detecting the pressure at the oil inlet of the system; the arm support amplitude detection module 520 is used for detecting an arm support amplitude angle; the arm support expansion detection module 530 is used for detecting the expansion length of the arm support; the control module 600 is electrically connected with the first unloading valve 420, the amplitude changing control valve group, the telescopic control valve group, the rotation control valve group, the hydraulic detection module 510, the arm support amplitude changing detection module 520 and the arm support telescopic detection module 530 respectively.

Specifically, as shown in fig. 1, it can be understood that the safety control system according to the embodiment of the present utility model is a hydraulic system, and the basic principle is that the hydraulic pump 200 is used to drive the oil in the oil tank 100 into the system pipeline, and the hydraulic pump 200 can be driven by an electric motor or an engine. By controlling different valves, the corresponding oil way pressure can be established, thereby finally realizing the action of each executing mechanism.

In some embodiments, the hydraulic pump 200 may employ a fixed displacement pump, and when the control module 600 receives a working order, it controls to turn on a motor or an engine to drive the hydraulic pump 200 to work, and to turn on the first unloading valve 420, and the three-way flow valve 410 is in a closed state, thus opening a passage between the hydraulic pump 200 and each control valve group. Further, when the control module 600 receives an execution instruction of boom luffing, telescopic or turntable rotation, the luffing control valve bank, the telescopic control valve bank or the rotation control valve bank are correspondingly controlled to be opened, so that oil can correspondingly enter each control valve bank. With continued reference to the dashed line connection in fig. 1, the load-sensitive (LS) oil circuit feeds back the load pressure to the three-way flow valve 410 to implement pressure building, so that the boom luffing cylinder 310, the boom telescopic cylinder 320 or the turntable rotary motor 330 correspondingly work, and finally the boom luffing, telescopic or turntable rotary actions are realized.

Further, when the control module 600 does not receive the boom luffing, telescoping or turntable turning executing command, and the hydraulic pressure detection module 510 detects that the pressure value at the system oil 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 faulty, so that the control module 600 will control to close the motor or engine to stop the operation of the hydraulic pump 200 and close the first unloading valve 420, on one hand, so that the hydraulic pump 200 does not continue to inject oil into the system, and on the other hand, the first unloading valve 420 leaks the flow in the system, thereby utilizing multiple redundancy protection to prevent the vehicle executing action from being uncontrolled and the pipeline from leaking.

Further, when the control module 600 receives the boom amplitude execution command but the boom extension detection module 530 detects the boom extension length change, or when the control module 600 receives the boom extension execution command but the boom amplitude detection module 520 detects the boom amplitude angle change, it is indicated that the amplitude control valve group or the extension control valve group is abnormal or faulty, so the control module 600 will control to close the motor or the engine to stop the hydraulic pump 200 and close the first unloading valve 420, on one hand, so that the hydraulic pump 200 does not continue to inject oil into the system, and on the other hand, the first unloading valve 420 leaks the flow in the system, thereby utilizing multiple redundancy protection to prevent the vehicle execution action from being uncontrolled and the pipeline from leaking.

In some embodiments, the hydraulic pressure detection module 510 may employ a pressure sensor, the boom amplitude detection module 520 may employ an angle sensor, the boom extension detection module 530 may employ a length sensor, and the control module 600 may employ a PLC programmable logic controller.

In this embodiment, the control module 600 is utilized to open the hydraulic pump 200 and the first unloading valve 420, so that the system oil circuit pressure can be established, and the channels of the oil entering each actuating mechanism are opened, so that the oil can enter the luffing control valve group, the telescopic control valve group and the rotary control valve group respectively to drive the boom luffing cylinder 310, the boom telescopic cylinder 320 and the turntable rotary motor 330, so as to execute each action of the vehicle; by utilizing the hydraulic pressure detection module 510 to detect the hydraulic pressure in the system and utilizing the boom amplitude detection module 520 and the boom extension detection module 530 to detect the change of the motion of the vehicle boom, once the hydraulic pump 200 fails to cause the pressure exceeding standard or the control valve group fails to cause the false triggering of the boom motion, the hydraulic pump 200 is controlled to be closed so that the pressure cannot be built at the oil port of the actuating mechanism, and meanwhile, the first unloading valve 420 is controlled to be closed to timely unload the flow in the system. Therefore, by utilizing the safety control system for the overhead working truck, which is disclosed by the embodiment of the utility model, the situation that the action of the truck is not controlled when a reversing valve or an oil source is in fault or abnormal is effectively prevented, and the construction safety of workers is ensured.

In some embodiments, as shown in fig. 2, the safety control system for an overhead working truck further includes an enable valve 430, where the enable valve 430 is connected to the system oil inlet, and the enable valve 430 is electrically connected to the control module 600.

Specifically, referring to fig. 2, it should be noted that in some embodiments, the hydraulic pump 200 may employ a variable displacement pump, and after the control module 600 receives the working command, the hydraulic pump 200, the first unloading valve 420 and the enabling valve 430 are controlled to be opened, and the three-way flow valve 410 is in a closed state, so that a channel between the hydraulic pump 200 and each control valve group is opened. Further, when the control module 600 receives an execution instruction of boom luffing, telescopic or turntable rotation, the luffing control valve bank, the telescopic control valve bank or the rotation control valve bank are correspondingly controlled to be opened, so that oil can correspondingly enter each control valve bank. With continued reference to the dashed line connection in fig. 1, in the Load Sensitive (LS) oil circuit, the first unloading valve 420 is electrically operated in the left position to feed back the load pressure to the variable pump to implement pressure building, so that the boom luffing cylinder 310, the boom telescopic cylinder 320 or the turntable rotary motor 330 correspondingly operate, and finally, the boom luffing, telescopic or turntable rotary motion is realized.

Further, when the control module 600 does not receive the boom luffing, telescoping or turntable rotation executing command, and the hydraulic detection module 510 detects that the pressure value at the system oil inlet is greater than the standby pressure value of the load sensitive variable pump, it indicates that the hydraulic pump 200 is abnormal or faulty, so the control module 600 will control the closing enabling valve 430 to enable the hydraulic value at the three-way flow valve 410 to reach the set value and then automatically open, so as to drain the flow at the system oil inlet, and close the first unloading valve 420 to drain the flow at the system oil return port, thereby utilizing multiple redundancy protection to prevent the vehicle executing action from being uncontrolled and the pipeline from leaking.

Further, when the control module 600 receives the boom amplitude execution command but the boom extension detection module 530 detects the boom extension length change, or when the control module 600 receives the boom extension execution command but the boom amplitude detection module 520 detects the boom amplitude angle change, it indicates that the amplitude control valve group or the extension control valve group is abnormal or faulty, so the control module 600 will control the closing enable valve 430 to enable the hydraulic value at the three-way flow valve 410 to reach the set value and then automatically open, so as to drain the flow at the system oil inlet, and close the first unloading valve 420 so as to drain the flow at the system oil return port, thereby utilizing multiple redundancy protection to prevent the vehicle execution action from being uncontrolled and the pipeline from leaking and other hazards.

In this embodiment, by arranging the enabling valve 430 between the system oil inlet and the control valve group of each actuator, the enabling valve 430 and the control valve group can form an interlock, so that when an abnormality or a failure occurs, the enabling valve 430 is controlled to be closed, so that the vehicle action can be prevented from being uncontrolled, and the hydraulic pump 200 does not need to be completely stopped, so as to avoid unnecessary damage caused by frequent switching of the hydraulic pump 200.

In some embodiments, as shown in fig. 1 or 2, the safety control system for an overhead working truck further includes a second unloading valve 440, the second unloading valve 440 is connected to an oil outlet of the swing control valve group, and the second unloading valve 440 is electrically connected to the control module 600.

Specifically, referring to fig. 1 or 2, when the control module 600 does not receive an execution instruction of turntable rotation but the turntable generates rotation motion, it is described that the rotation control valve set is abnormal or faulty, and the detection module is not provided to detect the rotation motion of the turntable of the vehicle, so that the control module 600 cannot make a judgment to perform safety control. In order to solve the problem, in the embodiment, the second unloading valve 440 is arranged at the oil outlet of the rotary control valve group, when the rotary control valve group needs to be closed, the second unloading valve 440 is closed to keep the unloading normally-on state, so that the working oil port of the rotary control valve group cannot build pressure if the rotary control valve group fails, thereby preventing a rotary table from rotating, and guaranteeing the safety of related personnel; and when the rotary control valve group needs to be opened, the second unloading valve 440 is opened to stop unloading, so that the working oil port of the rotary control valve group can normally build pressure.

It can be appreciated that by utilizing the second unloading valve 440 to protect the swing motion, a redundant protection is added to the swing motion, so that the influence on the safety of the whole vehicle due to the swing misoperation caused by the clamping stagnation of the swing valve core is avoided.

In some embodiments, as shown in fig. 1 or 2, the luffing control valve bank comprises: a first reversing valve 710, a first two-way balancing valve 720. The first reversing valve 710 is provided with a first oil inlet, a first oil outlet and a second oil outlet, and the first oil inlet is connected with the system oil inlet; the first bidirectional balance valve 720 is provided with a first oil port, a second oil port, a third oil port and a fourth oil port, wherein the first oil port is connected with the first oil outlet, the second oil port is connected with the second oil outlet, the third oil port is connected with a rodless cavity of the boom luffing cylinder 310, and the fourth oil port is connected with a rod cavity of the boom luffing cylinder 310.

Specifically, referring to fig. 1 or 2, it can be appreciated that by using the first reversing valve 710, the pressure oil control direction of the boom luffing cylinder 310 can be switched, so as to control the boom luffing motion; by utilizing the first bi-directional balancing valve 720, the boom luffing motion is ensured to be stable.

In some embodiments, as shown in fig. 1 or 2, the telescoping control valve bank includes: a second reversing valve 810, a second bi-directional balancing valve 820. The second reversing valve 810 is provided with a second oil inlet, a third oil outlet and a fourth oil outlet, and the second oil inlet is connected with the system oil inlet; the second bidirectional balancing valve 820 is provided with a fifth oil port, a sixth oil port, a seventh oil port and an eighth oil port, the fifth oil port is connected with the third oil outlet, the sixth oil port is connected with the fourth oil outlet, the seventh oil port is connected with the rodless cavity of the boom telescoping cylinder 320, and the eighth oil port is connected with the rod-containing cavity of the boom telescoping cylinder 320.

Specifically, referring to fig. 1 or 2, it can be appreciated that by using the second reversing valve 810, the direction of controlling the pressure oil of the boom extension cylinder 320 can be switched, so as to control the boom extension motion; by using the first bidirectional balancing valve 720, the stability of the telescopic action of the boom can be ensured.

In some embodiments, as shown in fig. 1 or 2, the swing control valve set includes: a third reversing valve 910, a third two-way balancing valve 920. The third reversing valve 910 is provided with a third oil inlet, a fifth oil outlet and a sixth oil outlet, and the third oil inlet is connected with the system oil inlet; the third bidirectional balance valve 920 is provided with a ninth oil port, a tenth oil port, an eleventh oil port and a twelfth oil port, the ninth oil port is connected with the fifth oil outlet, the tenth oil port is connected with the sixth oil outlet, and the eleventh oil port and the twelfth oil port are respectively connected with two oil ports of the turntable rotation motor 330; the second unloading valve 440 is connected between the eleventh oil port and the twelfth oil port.

Specifically, referring to fig. 1 or 2, it can be understood that by using the third reversing valve 910, it is possible to switch the pressure oil control direction of the turntable rotation motor 330, thereby controlling the turntable rotation action; by using the third two-way balance valve 920, the stability of the turntable rotation action can be ensured.

In addition, in order to better explain the safety control system for the aerial working vehicle according to the embodiment of the present utility model, as shown in fig. 3, the embodiment of the present utility model further provides a safety control method for the aerial working vehicle, which is applied to the safety control system for the aerial working vehicle according to any one of the embodiments of the first aspect of the present utility model, and includes the following steps:

opening the hydraulic pump 200 and the first unloading valve 420 to establish the system oil line pressure;

when the amplitude control valve bank, the telescopic control valve bank and the rotary control valve bank are not opened and the pressure value at the oil inlet of the system is detected to be larger than a first pressure threshold value, or an instruction for opening the amplitude control valve bank is sent and the telescopic length change of the arm support is detected, or an instruction for opening the telescopic control valve bank is sent and the amplitude angle change of the arm support is detected, the hydraulic pump 200 and the first unloading valve 420 are closed, the pressure value at the oil inlet of the system is collected by the hydraulic detection module 510, the amplitude angle change of the arm support is collected by the amplitude detection module 520, the telescopic length change of the arm support is collected by the telescopic detection module 530, and the first pressure threshold value represents the spring set pressure value of the three-way flow valve 410.

Specifically, referring to fig. 3, and referring to fig. 1, it can be understood that the safety control system for an aerial vehicle according to the present embodiment is used to implement the above-mentioned safety control method for an aerial vehicle, and the safety control method for an aerial vehicle according to the present embodiment corresponds to the foregoing safety control system for an aerial vehicle, and specific processing procedures refer to the foregoing safety control system for an aerial vehicle and are not described herein again.

In this embodiment, by executing the corresponding safety control method on the safety control system for the overhead working truck according to the embodiment of the present utility model, the control module 600 is used to open the hydraulic pump 200 and the first unloading valve 420, so that the system oil path pressure can be established, and the channels of the oil entering each actuating mechanism are opened, so that the oil can enter the luffing control valve group, the telescopic control valve group and the rotary control valve group respectively to drive the boom luffing cylinder 310, the boom telescopic cylinder 320 and the rotary table rotary motor 330, so as to execute each action of the truck; by utilizing the hydraulic pressure detection module 510 to detect the hydraulic pressure in the system and utilizing the boom amplitude detection module 520 and the boom extension detection module 530 to detect the change of the motion of the vehicle boom, once the hydraulic pump 200 fails to cause the pressure exceeding standard or the control valve group fails to cause the false triggering of the boom motion, the hydraulic pump 200 is controlled to be closed so that the pressure cannot be built at the oil port of the actuating mechanism, and meanwhile, the first unloading valve 420 is controlled to be closed to timely unload the flow in the system. Therefore, by utilizing the safety control method for the overhead working truck, which is disclosed by the embodiment of the utility model, the situation that the action of the truck is not controlled when a reversing valve or an oil source is in fault or abnormal is effectively prevented, and the construction safety of workers is ensured.

In some embodiments, as shown in fig. 2 and 4, the safety control system for an aerial vehicle further includes an enable valve 430, the enable valve 430 is connected to the system oil inlet, and the enable valve 430 is electrically connected to the control module 600;

the safety control method for the overhead working truck further comprises the following steps:

opening the hydraulic pump 200, the first unloading valve 420, and the enabling valve 430 to establish a system oil line pressure;

when the amplitude control valve bank, the telescopic control valve bank and the rotary control valve bank are not opened and the pressure value at the oil inlet of the system is detected to be larger than a second pressure threshold value, or an instruction for opening the amplitude control valve bank is sent and the telescopic length change of the arm support is detected, or an instruction for opening the telescopic control valve bank is sent and the amplitude angle change of the arm support is detected, the enabling valve 430 and the first unloading valve 420 are closed to enable the three-way flow valve 410 to be opened, the pressure value at the oil inlet of the system is collected by the hydraulic detection module 510, the amplitude angle change of the arm support is collected by the amplitude detection module 520, the telescopic length change of the arm support is collected by the telescopic detection module 530, and the second pressure threshold value represents the standby pressure value of the hydraulic pump 200.

Specifically, referring to fig. 2 and fig. 4, it should be noted that the safety control system for an aerial vehicle of the present embodiment further includes an enabling valve 430, which is configured to implement the above-mentioned safety control method for an aerial vehicle using the enabling valve 430, where the safety control method for an aerial vehicle of the present embodiment corresponds to the above-mentioned safety control system for an aerial vehicle, and specific processing procedures refer to the above-mentioned safety control system for an aerial vehicle and are not described herein again.

In some embodiments, as shown in fig. 1 or fig. 2, the safety control system for an overhead working truck further includes a second unloading valve 440, the second unloading valve 440 is connected to an oil outlet of the swing control valve group, and the second unloading valve 440 is electrically connected to the control module 600;

when the swing control valve group is closed, the second unloading valve 440 is closed to perform unloading;

when the swing control valve group is opened, the second unloading valve 440 is opened to stop unloading.

Specifically, referring to fig. 1 or fig. 2, it should be noted that the safety control system for an aerial work vehicle of the present embodiment further includes a second unloading valve 440 for implementing the above-mentioned safety control method for an aerial work vehicle to which the second unloading valve 440 is applied, where the safety control method for an aerial work vehicle of the present embodiment corresponds to the above-mentioned safety control system for an aerial work vehicle, and specific processing procedures refer to the above-mentioned safety control system for an aerial work vehicle and are not described herein again.

In addition, the embodiment of the utility model also provides an overhead working truck, which comprises an overhead working truck body and the safety control system for the overhead working truck according to any one of the embodiment of the first aspect of the utility model.

Specifically, it may be understood that in some embodiments, the working devices such as the foot switch and the operating handle are disposed on the aerial working vehicle body, and the instructions such as the working instructions and the execution instructions received by the control module 600 are respectively sent after the operating devices such as the foot switch and the operating handle are operated by the operator, so that the safety control system for the aerial working vehicle can perform the work on the aerial working vehicle body.

It can be appreciated that by loading the safety control system for the overhead working truck according to the embodiment of the present utility model on the overhead working truck body, the hydraulic pump 200 and the first unloading valve 420 are opened by using the control module 600, so that the system oil path pressure can be established, and the channels of the oil entering each actuator are opened, so that the oil can enter the luffing control valve group, the telescopic control valve group and the rotary control valve group respectively to drive the boom luffing cylinder 310, the boom telescopic cylinder 320 and the rotary table rotary motor 330, so as to execute each action of the truck; by utilizing the hydraulic pressure detection module 510 to detect the hydraulic pressure in the system and utilizing the boom amplitude detection module 520 and the boom extension detection module 530 to detect the change of the motion of the vehicle boom, once the hydraulic pump 200 fails to cause the pressure exceeding standard or the control valve group fails to cause the false triggering of the boom motion, the hydraulic pump 200 is controlled to be closed so that the pressure cannot be built at the oil port of the actuating mechanism, and meanwhile, the first unloading valve 420 is controlled to be closed to timely unload the flow in the system. Therefore, by utilizing the overhead working truck provided by the embodiment of the utility model, the situation that the action of the truck is not controlled when a reversing valve or an oil source is in fault or abnormal is effectively prevented, and the construction safety of workers is ensured.

Those of ordinary skill in the art will appreciate that all or some of the steps, systems, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components may 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 may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as known to those skilled in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. Furthermore, as is well known to those of ordinary skill in the art, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media.

The embodiments of the present utility model have been described in detail with reference to the accompanying drawings, but the present utility model is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present utility model.

Claims

1. A safety control system for an overhead working truck, comprising:

the oil tank is connected with the system oil return port;

the first unloading valve is connected to the oil return port of the system;

2. The safety control system for an overhead working truck according to claim 1, further comprising an enabling valve connected to the system oil inlet, the enabling valve being electrically connected to the control module.

3. The safety control system for an overhead working truck according to claim 1 or 2, further comprising a second unloading valve connected to an oil outlet of the swing control valve group, the second unloading valve being electrically connected to the control module.

4. The safety control system for an overhead working truck according to claim 3, wherein the luffing control valve group comprises:

5. A safety control system for an overhead working truck according to claim 3, wherein the telescopic control valve group comprises:

6. A safety control system for an overhead working truck according to claim 3, wherein the swing control valve group includes:

7. An overhead working truck comprising an overhead working truck body and the safety control system for the overhead working truck according to any one of claims 1 to 6.