Aircraft ladder control system and engineering machinery

Abstract

The invention discloses a boarding ladder control system and engineering machine.The boarding ladder control system comprises a boarding ladder driving device, a boarding control assembly and a boarding control switch, and the boarding ladder driving device is arranged on a boarding frame in the mode that the boarding ladder driving device can be driven to be opened or retracted; a power-on control circuit of the getting-on control assembly is electrically connected with a getting-on controller and can be powered on to start the getting-on controller, the getting-on controller receives a control instruction of the airstairs under the condition of power-on starting and controls an airstair driving device, and a getting-off control switch is arranged on a getting-off frame and connected with a power-on starting switch in parallel. The get-off control switch is used for powering on to start the get-on controller and sending a control instruction of the airstairs to the get-on controller, so that when the get-on controller is not powered on, an operator under the bus can activate the get-on controller to power on and start through the get-off control switch and send the control instruction of the airstairs to the get-on controller, and the get-on controller is powered off. Therefore, an operator can conveniently control the airstairs outside the airplane.

Description

Technical Field

[0001] The invention belongs to the technical field of boarding stairs, and in particular relates to a boarding stairs control system and engineering machinery. Background Art

[0002] Ultra-large excavators, especially those weighing more than 100 tons, can be used in large-scale construction projects such as the development of large-scale mineral resources, large-scale infrastructure, and land reclamation projects. Since the ultra-large excavator has a high body and the cab is installed at a high position, the operator needs to use a boarding ladder to reach the cab from the ground.

[0003] At present, the boarding ladder is generally controlled by setting a program through a controller. The problem with control through a controller is that the control function can only be executed when the controller is powered on. When people are under the vehicle and the machine is not powered on, the boarding ladder cannot be controlled. Summary of the invention

[0004] In view of the above-mentioned defects or shortcomings, the present invention provides a boarding ladder control system and engineering machinery, aiming to solve the technical problem that the existing boarding ladder control method makes it impossible to control the boarding ladder when people are under the vehicle and the machine is not powered on.

[0005] To achieve the above-mentioned purpose, the first aspect of the present invention provides a boarding ladder control system, wherein the boarding ladder control system includes a boarding ladder drive device, a boarding control assembly and an alighting control switch; the boarding ladder drive device can be driven to open or retract and is arranged on the lower frame; the boarding control assembly is arranged on the upper frame and includes a boarding controller and a power-on control circuit, the power-on control circuit is electrically connected to the boarding controller and can power on the boarding controller, the boarding controller is used to receive the control instructions of the boarding ladder when powered on, and control the boarding ladder drive device according to the control instructions; the alighting control switch is arranged on the lower frame and is arranged in parallel with the power-on start switch in the power-on control circuit, the alighting control switch is used to power on the boarding controller and send the control instructions of the boarding ladder to the boarding controller.

[0006] In one embodiment of the present invention, the vehicle disembarkation control switch includes a downward opening command switch and an upward retracting command switch, the boarding ladder driving device includes a boarding ladder and a driving assembly, the driving assembly is used to drive the boarding ladder on the lower frame to open or retract, and the vehicle controller is communicatively connected with the driving assembly and is configured as follows:

[0007] When receiving a downward opening instruction from a downward opening instruction switch, the driving component is controlled to drive the boarding ladder to open;

[0008] When receiving the upward retraction command issued by the upward retraction command switch, the control driving component drives the boarding ladder to be retracted.

[0009] In one embodiment of the present invention, the driving assembly includes a telescopic oil cylinder and a reversing valve. The boarding ladder is foldably disposed on the lower frame and is drivingly connected to the telescopic oil cylinder. The reversing valve is used to select one of the rod chamber and the rodless chamber of the telescopic oil cylinder to switch the oil supply, so as to drive the telescopic oil cylinder to drive the boarding ladder to open or fold and retract. The boarding controller is electrically connected to the first solenoid valve and the second solenoid valve of the reversing valve. The boarding controller is configured as follows:

[0010] When receiving a downward opening instruction issued by a downward opening instruction switch, the first solenoid valve is controlled to be energized so as to drive the telescopic cylinder to drive the boarding ladder to open;

[0011] When an upward retraction command is received from the upward retraction command switch, the second solenoid valve is controlled to be energized to drive the telescopic oil cylinder to drive the boarding ladder to be folded and retracted.

[0012] In one embodiment of the present invention, a pressure sensor for detecting the load of the cylinder is provided on the telescopic cylinder, and the pressure sensor is communicatively connected with the on-board controller.

[0013] In one embodiment of the present invention, a relay is further provided on the power-on control circuit, and the relay is located between the junction of the power-on start switch and the disembarkation control switch and the boarding controller; and / or, a position sensor is also provided on the disembarkation frame, and the position sensor is used to detect the position of the boarding ladder in the boarding ladder drive device and communicate with the boarding controller.

[0014] In one embodiment of the present invention, the on-board controller is further configured as follows:

[0015] Upon receiving the engine ignition start command, the position of the boarding ladder is detected;

[0016] When it is detected that the boarding ladder is not in the retracted position, the driving assembly is controlled to drive the boarding ladder to be retracted to the retracted position.

[0017] In one embodiment of the present invention, the on-board controller is further configured as follows:

[0018] Detect the position of the airstairs while the engine is running;

[0019] When it is detected that the boarding ladder is not in the retracted position, the rotation device and the walking device are prohibited from moving.

[0020] In one embodiment of the present invention, upon receiving an upward retraction instruction issued by an upward retraction instruction switch, controlling the driving assembly to drive the boarding ladder to retract includes:

[0021] Upon receiving an upward retraction command issued by an upward retraction command switch, detecting the load of the driving component;

[0022] When the load of the drive assembly exceeds a preset no-load load, controlling the drive assembly to keep the boarding ladder open;

[0023] When the load of the driving assembly does not exceed the preset no-load load, the driving assembly is controlled to retract the boarding ladder.

[0024] In one embodiment of the present invention, the calculation formula of the preset no-load load P is: P = P set +P offset , where P set Indicates the actual no-load load of the drive assembly, P offset Indicates the fault tolerance value.

[0025] To achieve the above object, a second aspect of the present invention provides an engineering machine, wherein the engineering machine includes the above-mentioned boarding ladder control system.

[0026] Through the above technical solution, the boarding ladder control system provided by the present invention has the following beneficial effects:

[0027] When the above-mentioned boarding ladder control system is used, since it includes a boarding ladder drive device, a boarding control assembly and an alighting control switch, the alighting control switch is arranged on the alighting frame and is arranged in parallel with the power-on start switch in the power-on control circuit of the boarding control assembly. Therefore, when the boarding controller is not powered on, the operator under the vehicle can activate the boarding controller for power-on start through the additional alighting control switch, and send the control instructions of the boarding ladder to the boarding controller to realize the off-board power-on operation function, so as to facilitate the operator to control the boarding ladder outside the aircraft.

[0028] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative work. In the accompanying drawings:

[0030] Figure 1 is a schematic diagram of a structure in which a boarding ladder driving device is installed on a lower frame according to an embodiment of the present invention;

[0031] Figure 2 is a circuit diagram of a boarding control assembly and an alighting control switch according to an embodiment of the present invention;

[0032] Figure 3is a control logic diagram of the automatic retraction function at startup according to an embodiment of the present invention;

[0033] Figure 4 4 is a control logic diagram of the active protection function according to an embodiment of the present invention.

[0034] Description of reference numerals:

[0035] 100 Boarding ladder drive device 110 Boarding ladder

[0036] 120 Telescopic cylinder 121 Pressure sensor

[0037] 130 reversing valve 131 first solenoid valve

[0038] 132 Second solenoid valve 200 On-board controller

[0039] 300 Power-on control circuit 301 Power-on start switch

[0040] 302 Relay 400 Get off control switch

[0041] 500 Lower frame 510 Position sensor DETAILED DESCRIPTION

[0042] The specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0043] The following describes the boarding ladder control system and the construction machine of the present invention with reference to the accompanying drawings.

[0044] like Figure 1 and Figure 2 As shown, the present invention provides a boarding ladder control system, wherein the boarding ladder control system includes:

[0045] The boarding ladder driving device 100 is arranged on the lower frame 500 so as to be driven to open or retract;

[0046] The boarding control assembly is arranged on the boarding frame and includes a boarding controller 200 and a power-on control circuit 300. The power-on control circuit 300 is electrically connected to the boarding controller 200 and can power on the boarding controller 200. The boarding controller 200 is used to receive a control instruction of the boarding ladder 110 when powered on, and control the boarding ladder drive device 100 according to the control instruction;

[0047] The getting-off control switch 400 is disposed on the getting-off frame 500 and is connected in parallel to the power-on start switch 301 in the power-on control circuit 300 . The getting-off control switch 400 is used to power-on the getting-on controller 200 and send control instructions for the boarding ladder 110 to the getting-on controller 200 .

[0048] When the above-mentioned boarding ladder control system is used, since it includes a boarding ladder drive device 100, a boarding control assembly and an alighting control switch 400, the alighting control switch 400 is arranged on the lower frame 500 and is arranged in parallel with the power-on start switch 301 in the power-on control circuit 300 of the boarding control assembly. Therefore, when the boarding controller 200 is not powered on, the operator under the vehicle can activate the boarding controller 200 for power-on start through the additional alighting control switch 400, and send a control instruction of the boarding ladder 110 to the boarding controller 200 to realize the off-board power-on operation function, so as to facilitate the operator to control the boarding ladder 110 outside the aircraft.

[0049] Specifically, the getting-off control switch 400 can be installed at a convenient location of the getting-off frame 500. Since the getting-off control switch 400 is set in parallel with the power-on start switch 301 in the power-on control circuit 300, pressing one of the power-on start switch 301 or the getting-off control switch 400 can power on the power-on control circuit 300 and send an ACC (Accessory Power) signal to the boarding controller 200, so that the boarding controller 200 activates the starter. At the same time, when the operator presses the downward opening command switch or the upward retraction command switch in the getting-off control switch 400, the downward opening command or the upward retraction command will be sent to the boarding controller 200 accordingly. After collecting the corresponding command signal, the boarding controller 200 controls the boarding ladder drive device 100 to perform corresponding actions.

[0050] In one embodiment of the present invention, the vehicle disembarkation control switch 400 includes a downward opening command switch and an upward retracting command switch, the boarding ladder driving device 100 includes a boarding ladder 110 and a driving component, the driving component is used to drive the boarding ladder 110 to open or retract on the lower frame 500, and the vehicle controller 200 is connected to the driving component in communication and is configured as follows:

[0051] When receiving a downward opening instruction from the downward opening instruction switch, the control driving assembly drives the boarding ladder 110 to open;

[0052] When receiving the upward retraction command issued by the upward retraction command switch, the control driving assembly drives the boarding ladder 110 to be retracted.

[0053] Specifically, the alighting control switch 400 is configured to include both a downward opening command switch and an upward retracting command switch, so that when boarding is required, the boarding ladder 110 can be controlled to open under the vehicle, and after alighting is completed, the boarding ladder 110 can be controlled to retract under the vehicle. Of course, the present invention is not limited to this, and the alighting control switch 400 can also be configured to have only a downward opening command switch, and the upward retracting command switch for controlling the retraction of the boarding ladder 110 can also be set on the upper frame, and when an operator is operating on the upper frame, the boarding ladder 110 can be retracted by pressing the upward retracting command switch.

[0054] At the same time, a boarding control switch can also be provided on the upper frame. The boarding control switch is arranged in parallel with the power-on start switch 301 in the power-on control circuit 300. The boarding control switch can also include a downward opening instruction switch and an upward retraction instruction switch. After the operator has finished boarding, the boarding retraction instruction switch in the boarding control switch can be pressed to control the driving component through the controller to drive the boarding ladder 110 to retract. When the operator needs to get off the vehicle, the downward opening instruction switch in the boarding control switch can be pressed to control the driving component through the controller to drive the boarding ladder 110 to open. Even if the boarding controller 200 has been shut down and powered off when getting off the vehicle, the boarding ladder 110 can still be controlled to facilitate getting off the vehicle.

[0055] In one embodiment of the present invention, the driving assembly includes a telescopic cylinder 120 and a reversing valve 130. The boarding ladder 110 is foldably disposed on the lower frame 500 and is drivingly connected to the telescopic cylinder 120. The reversing valve 130 is used to select one of the rod chamber and the rodless chamber of the telescopic cylinder 120 to switch the oil supply, so as to drive the telescopic cylinder 120 to drive the boarding ladder 110 to open or fold and retract. The boarding controller 200 is electrically connected to the first solenoid valve 131 and the second solenoid valve 132 of the reversing valve 130. The boarding controller 200 is configured as follows:

[0056] When receiving a downward opening instruction from the downward opening instruction switch, the first solenoid valve 131 is controlled to be energized to drive the telescopic cylinder 120 to drive the boarding ladder 110 to open;

[0057] When receiving the upward retraction command issued by the upward retraction command switch, the second solenoid valve 132 is controlled to be energized to drive the telescopic cylinder 120 to drive the boarding ladder 110 to be folded and retracted.

[0058] It can be understood that the drive assembly is configured to include a telescopic oil cylinder 120 and a reversing valve 130, that is, in the present invention, a hydraulic drive is selected to drive the boarding ladder 110 to open or retract. The advantages of hydraulic drive are obvious. On the one hand, it can achieve efficient, stable and precise motion control. On the other hand, the structure is simple and compact, and it is easy to maintain and repair. Of course, the present invention is not limited to this, and the drive assembly can also be configured as a telescopic drive component with other power.

[0059] Specifically, the cylinder body of the telescopic oil cylinder 120 is arranged on the lower frame 500, and the piston rod of the telescopic oil cylinder 120 is connected to the boarding ladder 110. When the piston rod is extended, it can drive the boarding ladder 110 to fold up and retract, and when the piston rod is retracted, it can drive the boarding ladder 110 to open downward, and the first working oil port and the second working oil port of the reversing valve 130 are respectively connected to the rod chamber and the rodless chamber of the telescopic oil cylinder 120 in a one-to-one correspondence, and when the first solenoid valve 131 of the reversing valve 130 is energized, the first working oil port of the reversing valve 130 is switched to the inlet of the reversing valve 130. The oil port is connected, the second working oil port is switched to be connected to the oil return port of the reversing valve 130, the rod chamber of the telescopic oil cylinder 120 is supplied with oil, and the rodless chamber is returned with oil, so that the piston rod is retracted and drives the boarding ladder 110 to open downward, when the second solenoid valve 132 of the reversing valve 130 is energized, the second working oil port of the reversing valve 130 is switched to be connected to the oil inlet of the reversing valve 130, the first working oil port is switched to be connected to the oil return port of the reversing valve 130, the rodless chamber of the telescopic oil cylinder 120 is supplied with oil, and the rod chamber is returned with oil, so that the piston rod is extended and drives the boarding ladder 110 to fold and retract upward. Of course, the present invention is not limited to this, and the telescopic oil cylinder 120 is configured to drive the boarding ladder 110 to fold and retract upward when the piston rod is retracted, and it is also possible to drive the boarding ladder 110 to open downward when the piston rod is extended.

[0060] In one embodiment of the present invention, a pressure sensor 121 for detecting the cylinder load is provided on the telescopic cylinder 120, and the pressure sensor 121 is communicatively connected to the boarding controller 200. It can be understood that if a person or an object stands on the boarding ladder 110, the cylinder load will change compared to when the boarding ladder 110 is unloaded. By adding a pressure sensor 121 to the telescopic cylinder 120, such a change can be automatically detected, and such a change signal can be sent to the boarding controller 200, so that the boarding controller 200 can make corresponding control later. It should be particularly noted that the communication connection mentioned in the present invention can refer to both wire connection and wireless communication connection.

[0061] In one embodiment of the present invention, a relay 302 is further provided on the power-on control circuit 300, and the relay 302 is located between the junction of the power-on start switch 301 and the get-off control switch 400 and the boarding controller 200. The addition of the relay 302 in the power-on control circuit 300 can ensure that the boarding controller 200 can be started smoothly and enter a normal operating state. When the boarding controller 200 needs to be started, the relay 302 helps the power-on controller to overcome the resistance during startup and start smoothly by providing the necessary current. At the same time, the relay 302 can play a role of automatic adjustment and safety protection in the circuit. When a fault in the circuit is detected, the relay 302 can disconnect the circuit to prevent equipment damage or safety accidents.

[0062] In one embodiment of the present invention, a position sensor 510 is further provided on the lower frame 500. The position sensor 510 is used to detect the position of the boarding ladder 110 in the boarding ladder driving device 100 and communicate with the boarding controller 200. By adding the position sensor 510, the boarding controller 200 can automatically obtain the position of the boarding ladder 110, so that the boarding controller 200 can accurately control the boarding ladder 110. Specifically, the position sensor 510 can be set as an upper limit proximity switch and a lower limit proximity switch on the lower frame 500. Of course, the present invention is not limited to this. The position sensor 510 can also be set as an angle sensor for detecting the flipping and folding angle of the boarding ladder 110.

[0063] In one embodiment of the present invention, the on-board controller 200 is further configured as follows:

[0064] Upon receiving an engine ignition start command, detecting the position of the boarding ladder 110;

[0065] When it is detected that the boarding ladder 110 is not in the retracted position, the driving assembly is controlled to drive the boarding ladder 110 to be retracted to the retracted position.

[0066] Specifically, when the engine ignition start button is pressed, the boarding ladder 110 can be automatically retracted to prevent the boarding ladder 110 from being hit by obstacles during operation. Figure 3 As shown, after the engine ignition is detected, the position of the boarding ladder 110 is first determined according to the detection data of the position sensor 510. If it is detected that the boarding ladder 110 is in the retracted position at this time, no operation is performed and the boarding ladder 110 remains in the original position; otherwise, the driving component is controlled to drive the boarding ladder 110 to the retracted position, thereby realizing the automatic retraction function of the boarding ladder 110 when the engine is started. More specifically, whether the boarding ladder 110 is in the retracted position can be detected by the aforementioned position sensor 510.

[0067] Further, in the case of receiving the engine ignition start command, after detecting the position of the boarding ladder 110, it also includes:

[0068] When it is detected that the boarding ladder 110 is in the retracted position, the engine is controlled to start.

[0069] That is, the engine ignition start needs to be determined in advance that the boarding ladder 110 is in the retracted position before the engine start can be controlled to further improve the safety performance. Of course, the present invention is not limited to this, and the engine start and the boarding ladder retract drive can be performed simultaneously.

[0070] In one embodiment of the present invention, the on-board controller 200 is further configured as follows:

[0071] detecting the position of the airstairs 110 during engine operation;

[0072] When it is detected that the boarding ladder 110 is not in the retracted position, the rotation device and the traveling device are prohibited from operating.

[0073] Furthermore, during the operation of the engine, if it is detected that the boarding ladder 110 is not in the retracted position, it is possible that other people need to temporarily get on or off the vehicle. At this time, the controller can automatically limit the movement of the rotating device and the walking device of the equipment, thereby preventing the boarding ladder 110 from being hit during the walking or rotating process of the equipment due to failure to retract in time. The control logic is as follows Figure 4 As shown, during the operation of the engine, the position of the boarding ladder 110 is always detected by the position sensor 510, and it is determined whether the boarding ladder 110 is in the retracted position. If it is not in the retracted position, the rotation or walking action is prohibited, thereby playing an active protection function. Furthermore, when the boarding ladder 110 is set to be folded upward and retracted, the upper limit position of the boarding ladder 110 is the retracted position; when the boarding ladder 110 is set to be folded downward and retracted, the lower limit position of the boarding ladder 110 is the retracted position.

[0074] In one embodiment of the present invention, upon receiving an upward retraction instruction issued by an upward retraction instruction switch, controlling the driving assembly to drive the boarding ladder 110 to retract includes:

[0075] Upon receiving an upward retraction command issued by an upward retraction command switch, detecting the load of the driving component;

[0076] When the load of the drive assembly exceeds a preset no-load load, controlling the drive assembly to keep the boarding ladder 110 open;

[0077] When the load of the driving assembly does not exceed the preset no-load load, the driving assembly is controlled to retract the boarding ladder 110 .

[0078] It can be understood that before controlling the drive assembly to drive the boarding ladder 110 to retract according to the upward retraction instruction, the load of the drive assembly can be detected first, and based on the comparison result of the detected data with the preset no-load load, it can be determined whether there are people or objects on the current boarding ladder 110. If it is determined that there are people or objects, the boarding ladder 110 will not be retracted and the boarding ladder 110 will be kept in the open state, so as to avoid the occurrence of dangerous situations, and the boarding ladder 110 will not be retracted until it is determined that there are no people or objects.

[0079] When the boarding ladder 110 is retracted, if a person or object stays on the boarding ladder 110, it may cause harm, so this situation should be avoided. In the prior art, the operator usually avoids dangerous situations by observing more. The present invention proposes a pedestrian detection function to eliminate the safety hazards that may be caused by the operator's negligence or careless observation. Figure 1 As shown, a pressure sensor 121 can be installed in the oil circuit of the rodless chamber of the telescopic oil cylinder 120. During the normal upward retraction process of the boarding ladder 110, the piston rod of the telescopic oil cylinder 120 is only subjected to the deadweight force of the boarding ladder 110. If there are people or objects on the boarding ladder 110, the force on the telescopic oil cylinder 120 will increase. That is, the oil cylinder loads in the two situations are different, so the pressures of the rodless chamber of the telescopic oil cylinder 120 in the two situations are also different. When the boarding ladder 110 is in the open position, it can be judged whether there are people or objects on the boarding ladder 110 based on the pressure detected by the pressure sensor 121. If the pressure detected exceeds the preset no-load load, it is considered that there are people or other objects on the boarding ladder 110, and protection will be entered at this time. Even if the upward retraction command switch is pressed, the corresponding solenoid valve will not output, thereby avoiding dangerous situations.

[0080] In one embodiment of the present invention, the calculation formula of the preset no-load load P is: P = P set +P offset , where P set Indicates the actual no-load load of the drive assembly, P offset Indicates the fault tolerance value. That is, by adding the fault tolerance value to the preset no-load load, the occurrence of erroneous operation can be avoided.

[0081] Specifically, the prior art of using a manual switch directly connected to the power supply to control the boarding ladder 110 cannot realize the more advanced control functions of the boarding ladder 110, and the boarding ladder 110 controlled by the program through the controller cannot be operated when the machine is powered off. The boarding ladder control system provided by the present invention designs a wiring circuit for the control switch of the boarding ladder 110, so that when the machine is stopped, the boarding controller 200 can be automatically activated through the disembarkation control switch 400, and the boarding ladder 110 is logically controlled, which is convenient for the operator to control the boarding ladder 110 outside the machine. At the same time, the present invention also proposes functions such as starting automatic retraction, active protection, and pedestrian detection, which improves the safety and intelligence of the boarding ladder 110.

[0082] In addition, the present invention also provides an engineering machine, wherein the engineering machine includes the above-mentioned boarding ladder control system. Since the engineering machine adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here. Specifically, the engineering machine includes but is not limited to an ultra-large excavator.

[0083] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0084] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0085] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0086] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A boarding ladder control system, characterized in that: The boarding ladder control system comprises: A boarding ladder driving device (100) is arranged on the lower frame (500) so as to be driven to open or retract; A boarding control assembly is arranged on the boarding frame and comprises a boarding controller (200) and a power-on control circuit (300), wherein the power-on control circuit (300) is electrically connected to the boarding controller (200) and can power on and start the boarding controller (200), and the boarding controller (200) is used to receive a control instruction of the boarding ladder (110) when powered on and start, and control the boarding ladder drive device (100) according to the control instruction; The vehicle disembarkation control switch (400) is arranged on the vehicle disembarkation frame (500) and is arranged in parallel with the power-on start switch (301) in the power-on control circuit (300). The vehicle disembarkation control switch (400) is used to power on and start the vehicle boarding controller (200) and send a control instruction for the boarding ladder (110) to the vehicle boarding controller (200).

2. The boarding ladder control system according to claim 1, characterized in that: The vehicle disembarkation control switch (400) comprises a downward opening command switch and an upward retracting command switch, the boarding ladder driving device (100) comprises a boarding ladder (110) and a driving component, the driving component is used to drive the boarding ladder (110) on the lower vehicle frame (500) to open or retract, and the vehicle disembarkation controller (200) is communicatively connected with the driving component and is configured as follows: When receiving a downward opening instruction from a downward opening instruction switch, controlling the driving component to drive the boarding ladder (110) to open; When receiving an upward retraction instruction issued by an upward retraction instruction switch, the control driving component drives the boarding ladder (110) to be retracted.

3. The boarding ladder control system according to claim 2, characterized in that: The driving assembly comprises a telescopic oil cylinder (120) and a reversing valve (130); the boarding ladder (110) is foldably and flippably arranged on the lower frame (500) and is drivingly connected to the telescopic oil cylinder (120); the reversing valve (130) is used to select one of the rod chamber and the rodless chamber of the telescopic oil cylinder (120) to switch the oil supply, so as to drive the telescopic oil cylinder (120) to drive the boarding ladder (110) to open or fold and retract; the boarding controller (200) is electrically connected to the first solenoid valve (131) and the second solenoid valve (132) of the reversing valve (130); and the boarding controller (200) is configured as follows: When receiving a downward opening instruction from a downward opening instruction switch, the first electromagnetic valve (131) is controlled to be energized so as to drive the telescopic oil cylinder (120) to drive the boarding ladder (110) to open; When an upward retraction command is received from an upward retraction command switch, the second electromagnetic valve (132) is controlled to be energized to drive the telescopic oil cylinder (120) to drive the boarding ladder (110) to be folded and retracted.

4. The boarding ladder control system according to claim 3, characterized in that: The telescopic oil cylinder (120) is provided with a pressure sensor (121) for detecting the oil cylinder load, and the pressure sensor (121) is communicatively connected with the on-board controller (200).

5. The boarding ladder control system according to claim 1, characterized in that: The power-on control circuit (300) is further provided with a relay (302), and the relay (302) is located between the junction of the power-on start switch (301) and the disembarkation control switch (400) and the boarding controller (200); and / or, the disembarkation frame (500) is further provided with a position sensor (510), and the position sensor (510) is used to detect the position of the boarding ladder (110) in the boarding ladder driving device (100) and is communicatively connected with the boarding controller (200).

6. The boarding ladder control system according to any one of claims 2 to 5, characterized in that: The on-board controller (200) is also configured to: Upon receiving an engine ignition start command, detecting the position of the boarding ladder (110); When it is detected that the boarding ladder (110) is not in the retracted position, the driving component is controlled to drive the boarding ladder (110) to be retracted to the retracted position.

7. The boarding ladder control system according to any one of claims 2 to 5, characterized in that: The on-board controller (200) is also configured to: detecting the position of the boarding ladder (110) during engine operation; When it is detected that the boarding ladder (110) is not in the retracted position, the rotation device and the running device are prohibited from moving.

8. The boarding ladder control system according to any one of claims 2 to 5, characterized in that: When receiving an upward retraction instruction issued by an upward retraction instruction switch, controlling the driving component to drive the boarding ladder (110) to retract comprises: Upon receiving an upward retraction command issued by an upward retraction command switch, detecting the load of the driving component; When the load of the drive assembly exceeds a preset no-load load, controlling the drive assembly to keep the boarding ladder (110) open; When the load of the driving assembly does not exceed the preset no-load load, the driving assembly is controlled to retract the boarding ladder (110).

9. The boarding ladder control system according to claim 8, characterized in that: The calculation formula of the preset no-load load P is: P = P set +P offset , where P set Indicates the actual no-load load of the drive assembly, P offset Indicates the fault tolerance value.

10. An engineering machine, characterized in that: The construction machine comprises a passenger ladder control system according to any one of claims 1 to 9.

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