Folding ladder control system and operation machine

Abstract

The invention discloses a folding ladder control system and an operation machine, and relates to the technical field of large operation machines. The control system comprises an execution mechanism connected with the folding ladder; the first switch is arranged on the lower portion of a rotary table of the operation machine and used for controlling the executing mechanism to operate on the ground by an operator so as to drive the folding ladder to be folded and unfolded. And the second switch is arranged above the rotary table and is used for controlling the execution mechanism to operate on the rotary table of the operation machine by an operator so as to drive the folding ladder to fold and stretch. Through the first switch arranged at the lower part of the rotary table of the operation machine and the second switch arranged above the rotary table, the execution mechanism is controlled to operate so as to drive the folding ladder to act. The folding ladder can be directly operated without the need for an operator to climb into an operation machine cabin to start a switch, so that the operation convenience of the folding ladder is improved, and the falling risk caused by the fact that the operator needs to climb an operation machine with bare hands is reduced; and an operator can conveniently control the folding ladder on the operation mechanical turntable.

Description

Technical Field

[0001] The present application relates to the technical field of large-scale working machinery, and in particular to a folding ladder control system and a working machinery. Background Art

[0002] For example, in the case of super-large operating machinery of 200 tons and above (for example, large excavators, etc.) operating in mining areas, due to the huge overall structure, when workers enter the cab or turntable from the ground for operation or maintenance, they need to use a folding ladder to land. During the landing process, the folding ladder must first be extended to be flush with the ground, and the operator lands along the ladder. After landing on the cab or turntable, the folding ladder needs to be folded up to prevent the folding ladder from colliding with the crawler or ground stones during the rotation or operation of the operating machinery, causing damage to the folding ladder.

[0003] At present, the extension or folding action of the folding ladder needs to be controlled by a controller, that is, the operator needs to climb to the turntable without any tools, enter the cab, power on the control system and start the engine, and then extend the folding ladder on the turntable. The operator climbing to the turntable to enter the cab is dangerous and inconvenient; at the same time, during the rotation of the turntable, the folding ladder will collide with the crawler track or stones on the ground because it is not folded. Summary of the invention

[0004] The purpose of the embodiment of the present application is to provide a folding ladder control system to solve the problem in the prior art that when controlling the folding ladder to extend or fold, the operator needs to climb to the turntable to enter the cab, which is both dangerous and inconvenient.

[0005] In order to achieve the above-mentioned purpose, the first aspect of the present application provides a folding ladder control system, which includes: an actuator connected to the folding ladder of the working machine, used to drive the folding ladder to extend and fold; a first switch, arranged at the lower part of the turntable of the working machine, used for the operator on the ground to control the operation of the actuator to drive the folding ladder to fold and extend; and a second switch, arranged above the turntable of the working machine, used for the operator on the turntable of the working machine to control the operation of the actuator to drive the folding ladder to fold and extend.

[0006] In the embodiment of the present application, the first switch includes a folding switch and an extension switch. The folding switch is used to control the operation of the actuator to drive the folding ladder to fold, and the extension switch is used to control the operation of the actuator to drive the folding ladder to extend.

[0007] In an embodiment of the present application, the actuator includes a distribution box, an electric pump, a hydraulic cylinder, a solenoid valve switch and a passive magnetic switch. The first switch and the second switch are connected to the distribution box, the electric pump and the hydraulic cylinder in sequence, and the hydraulic cylinder is connected to the folding ladder. The first switch and the second switch control the electric pump by controlling the relay built into the distribution box, and the electric pump drives the hydraulic cylinder to operate so that the hydraulic cylinder drives the folding ladder to operate. The solenoid valve switch is connected between the electric pump and the hydraulic cylinder. The solenoid switch valve includes a folding ladder solenoid valve and a folding ladder extension solenoid valve. The folding ladder solenoid valve is used to control the oil circuit of the hydraulic cylinder to drive the folding ladder to fold, and the folding ladder extension solenoid valve is used to control the oil circuit of the hydraulic cylinder to drive the folding ladder to extend. The passive magnetic switch is used to sense the operating state of the folding ladder. The passive magnetic switch includes a folding-in-place passive magnetic switch and an extended-in-place passive magnetic switch.

[0008] In an embodiment of the present application, when the folding ladder is controlled to extend by the folding ladder control system, the first switch or the second switch is operated and maintained. The first switch or the second switch controls the coil of the first relay and the coil of the second relay in the distribution box. After the coil of the first relay is energized, the normally open contact of the first passive magnetic switch is energized to control the coil of the contactor of the electric pump. After the coil of the contactor of the electric pump is energized, the normally open contact is energized, and the system total power drives the motor of the electric pump to work, and the electric pump drives the hydraulic cylinder to operate, so that the hydraulic cylinder drives the folding ladder to operate. After the coil of the second relay is energized, the normally open contact of the first passive magnetic switch is energized, and the first folding ladder extension solenoid valve is energized. After the first folding ladder extension solenoid valve is energized, the folding ladder extension cylinder performs the corresponding extension action.

[0009] In an embodiment of the present application, when the folding ladder is extended into place, the state of the first passive magnetic switch that is triggered changes, and the normally closed contact of the first passive magnetic switch that is triggered becomes normally open, cutting off the coil voltage of the first relay and the second relay, thereby cutting off the coil voltage of the contactor of the electric pump and the first folding ladder extension solenoid valve, causing the coil of the contactor of the electric pump to lose power, the motor of the electric pump to stop working, and the first folding ladder extension solenoid valve to lose power and then close again.

[0010] In an embodiment of the present application, when the folding ladder is controlled to fold by the folding ladder control system, the first switch or the second switch is operated and maintained. The first switch or the second switch controls the coil of the third relay and the coil of the fourth relay in the distribution box. After the coil of the third relay is energized, the normally open contact of the second passive magnetic switch is energized to control the coil of the contactor of the electric pump. After the coil of the contactor is energized, the normally open contact is energized to control the coil of the contactor of the electric pump. After the coil of the contactor is energized, the normally open contact is energized to control the coil of the electric pump. The system total power drives the motor of the electric pump to work, and the electric pump drives the hydraulic cylinder to operate, so that the hydraulic cylinder drives the folding ladder to operate. After the coil of the fourth relay is energized, the normally open contact of the second passive magnetic switch is energized to control the coil of the contactor of the electric pump. After the coil of the contactor ... is energized to control the coil of the contactor of the electric pump. The system total power drives the motor of the electric pump to work, and the electric pump drives the hydraulic cylinder to operate, so that the hydraulic cylinder drives the folding ladder to operate. After the coil of the fourth relay is energized, the normally open contact of the second passive magnetic switch is energized to control the coil of the second folding ladder extension solenoid valve. After the second folding ladder extension solenoid valve is energized, the folding ladder extension cylinder performs the corresponding folding action.

[0011] In an embodiment of the present application, when the folding ladder is folded into place, the state of the second passive magnetic switch is triggered to change, and the normally closed contact of the second passive magnetic switch becomes normally open, cutting off the coil voltage of the third relay and the fourth relay, thereby cutting off the coil voltage of the contactor of the electric pump and the second folding ladder extension solenoid valve, causing the coil of the contactor of the electric pump to lose power, the motor of the electric pump to stop working, and the second folding ladder extension solenoid valve to lose power and close again.

[0012] In an embodiment of the present application, the control system further includes a controller and a display, wherein the controller is connected to the passive magnetic switch and is used to receive a status signal of the passive magnetic switch, and the display is used to display the operating status of the folding ladder.

[0013] In an embodiment of the present application, the controller is also used to: when the working machine is performing a walking or rotating action, control the folding ladder to be unable to perform a folding or extending action; and when the operating state of the folding ladder shows that the folding ladder is in an unfolded state, control the working machine to be unable to perform a walking or rotating action.

[0014] A second aspect of the present application provides a working machine, which includes the above-mentioned folding ladder control system.

[0015] Through the above technical solution, the embodiment of the present invention controls the operation of the actuator through the first switch arranged at the lower part of the folding ladder turntable of the working machine to drive the folding ladder to fold and extend; and also controls the operation of the actuator through the second switch arranged above the folding ladder turntable of the working machine to drive the folding ladder to fold and extend. Without the need for the operator to climb into the working machine cabin by hand to start the power-on switch, the folding ladder can be directly operated to extend and fold, thereby improving the convenience of the folding ladder operation and reducing the risk of falling caused by the operator needing to climb the working machine by hand; it can also facilitate the operator to control the folding ladder on the turntable of the working machine.

[0016] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present application, but do not constitute a limitation on the embodiments of the present application. In the accompanying drawings:

[0018] Figure 1 is a schematic structural diagram of a folding ladder control system provided by an embodiment of the present invention;

[0019] Figure 2 is a schematic diagram of the structure of an example folding ladder control system; and

[0020] Figure 3 is a circuit schematic of an example folding ladder control system.

[0021] Description of Reference Numerals

[0022] DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It should be understood that the specific implementation methods described herein are only used to illustrate and explain the embodiments of the present application, and are not used to limit the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0024] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0025] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0026] Figure 1 This is a schematic diagram of the structure of the folding ladder control system provided by the embodiment of the present invention. Please refer to Figure 1 The folding ladder control system may include: an actuator 20, connected to the folding ladder of the working machine, used to drive the folding ladder to extend and fold; a first switch 11, arranged at the lower part of the turntable of the working machine, used by the operator on the ground to control the operation of the actuator 20 to drive the folding ladder to fold and extend; and a second switch 12, arranged above the turntable of the working machine, used by the operator on the turntable of the working machine to control the operation of the actuator 20 to drive the folding ladder to fold and extend.

[0027] The first switch 11 is, for example, a pull-rope switch, installed at the left rear portion of the lower portion of the turntable, and the second switch 12 is, for example, a knob switch, installed on the turntable near the folding ladder.

[0028] The first switch 11 and the second switch 12 may also use positioning switches instead of reset switches, but due to safety operations, it is more reliable to use reset-type first switches 11 and second switches 12.

[0029] The first switch 11 preferably includes a folding switch and an extension switch. The folding switch is used to control the operation of the actuator 20 to drive the folding ladder to fold, and the extension switch is used to control the operation of the actuator 20 to drive the folding ladder to extend.

[0030] The embodiment of the present invention provides a first switch at the bottom of the folding ladder turntable of the working machine (for example, a large excavator or other working machine), so that the operator does not need to climb into the working machine cabin by hand to start the power switch, and can directly operate the folding ladder to extend and fold, thereby improving the convenience of the folding ladder operation and reducing the risk of falling caused by the operator needing to climb the working machine by hand. The embodiment of the present invention also provides a second switch above the folding ladder turntable of the working machine, so that the operator can control the folding ladder on the folding ladder turntable of the working machine.

[0031] Preferably, the control system may further include a system main power supply for supplying power to the control system, and the system main power supply is preferably a battery.

[0032] To illustrate by way of example, the system total power supply provides an energy source for the control system, so that when controlling the folding ladder, there is no need to start the engine of the operating machine. The preferred system total power supply of the embodiment of the present invention can be a maintenance-free lead-acid battery. Since the maintenance-free lead-acid battery can also provide energy for the engine starter motor of the operating machine, therefore, according to the calculation of power consumption, the embodiment of the present invention preferably uses two large-capacity 12V lead-acid batteries in series and then three groups in parallel to provide power for the entire system startup. Further preferably, the system total power supply can also be equipped with a total power switch, which is used to cut off the connection between the negative pole of the maintenance-free lead-acid battery and the turntable grounding point, and disconnect the power supply of the entire electrical system by disconnecting the negative pole. When the operating machine is continuously operating in shifts, the total power switch will not be disconnected. It is only recommended to disconnect the total power switch when the downtime is long.

[0033] Please refer to Figure 2 , the preferred actuator of the embodiment of the present invention may include a distribution box, an electric pump, a hydraulic cylinder, a solenoid valve switch and a passive magnetic switch. The first switch and the second switch are connected to the distribution box, the electric pump and the hydraulic cylinder in sequence, and the hydraulic cylinder is connected to the folding ladder. The first switch and the second switch control the electric pump by controlling the built-in relay of the distribution box, and the electric pump drives the hydraulic cylinder to operate so that the hydraulic cylinder drives the folding ladder to operate. The solenoid valve switch is connected between the electric pump and the hydraulic cylinder. The solenoid switch valve includes a folding ladder solenoid valve and a folding ladder extension solenoid valve. The folding ladder solenoid valve is used to control the oil circuit of the hydraulic cylinder to drive the folding ladder to fold, and the folding ladder extension solenoid valve is used to control the oil circuit of the hydraulic cylinder to drive the folding ladder to extend. The passive magnetic switch is used to sense the operating state of the folding ladder. The passive magnetic switch includes a folding-in-place passive magnetic switch and an extended-in-place passive magnetic switch. As Figure 2As shown, the orange line can represent the flow direction of the power current, the blue line can represent the flow direction of the control current and signal current, and the green current can represent the flow direction of the hydraulic oil.

[0034] Preferably, each passive magnetic switch may include a normally open contact and a normally closed contact, and the state change of each passive magnetic switch includes the normally open contact becoming a normally closed state or the normally closed contact becoming a normally open state.

[0035] In the embodiment of the present invention, the hydraulic cylinder of the folding ladder is used to make linear motion. The piston rod of the hydraulic cylinder moves outward to push the folding ladder to fold, and the piston rod moves back toward the cylinder barrel to drive the folding ladder to extend. That is, when the rodless chamber of the pressurized oil flows in oil and the rod chamber returns oil, the piston rod is pushed to move toward the outside of the cylinder barrel; when the rod chamber flows in oil and the rodless chamber returns oil, the piston rod is pushed to move toward the cylinder barrel.

[0036] In the embodiment of the present invention, all the fuses and relays can be integrated in the distribution box, which can greatly reduce the installation space and facilitate maintenance. The fuses and relays can also be dispersedly installed on the turntable instead of the centralized installation.

[0037] Preferably, the control system may also include an audible and visual alarm, which may be used to emit a sound and / or flash a light (eg, flash a yellow light) during the folding and extending process of the folding ladder to remind on-site personnel to pay attention to safety.

[0038] Preferably, when the folding ladder is controlled to extend by the folding ladder control system, the first switch or the second switch is operated and maintained. The first switch or the second switch controls the coil of the first relay and the coil of the second relay in the distribution box. After the coil of the first relay is energized, the normally open contact of the first passive magnetic switch is energized to control the coil of the contactor of the electric pump. After the coil of the contactor of the electric pump is energized, the normally open contact is energized, and the system total power drives the motor of the electric pump to work, and the electric pump drives the hydraulic cylinder to operate, so that the hydraulic cylinder drives the folding ladder to operate. After the coil of the second relay is energized, the normally open contact of the first passive magnetic switch is energized, and the first folding ladder extension solenoid valve is energized. After the first folding ladder extension solenoid valve is energized, the folding ladder extension cylinder performs the corresponding extension action.

[0039] Further preferably, when the folding ladder is extended into position, the state of the first passive magnetic switch that is triggered changes, and the normally closed contact of the first passive magnetic switch that is triggered becomes normally open, cutting off the coil voltage of the first relay and the second relay, thereby cutting off the coil voltage of the contactor of the electric pump and the first folding ladder extension solenoid valve, causing the coil of the contactor of the electric pump to lose power, the motor of the electric pump to stop working, and the first folding ladder extension solenoid valve to lose power and then close again.

[0040] Please refer to Figure 3 In the example of an implementation process, the operator on the ground can operate the first switch (extension switch) at the bottom of the turntable and keep it on; at this time, the power supply (e.g., 24V DC) of the first switch is from the normally closed contact of the relay (e.g., relay K1) through the extension switch and the normally closed contact of the first passive magnetic switch (i.e., the passive magnetic switch extended to the position, for example, the passive magnetic switch SQ2 is triggered), and the coils of the first relay (e.g., relay K4) and the second relay (e.g., relay K5) in the distribution box are controlled. After the coil of relay K4 is energized, the normally open contact is attracted and turned on, thereby controlling the coil of the contactor (e.g., contactor K6) of the electric pump (e.g., electric pump M1); after the coil of contactor K6 is energized, the normally open contact is attracted and turned on, and the battery drives the motor of the electric pump M1 to work, thereby driving the electric pump motor to work. After the coil of relay K5 is energized, the normally open contact is attracted and turned on, and the first folding ladder extension solenoid valve (e.g., folding ladder extension solenoid valve Y2) is energized. After the folding ladder extension solenoid valve Y2 is energized, the folding ladder extension cylinder performs the extension action. At the same time, the sound and light alarm can also flash to remind the site to pay attention to safety.

[0041] Furthermore, when the folding ladder is extended into place, the state of the passive magnetic switch SQ2 is triggered to change, and the normally closed contact of the passive magnetic switch SQ2 becomes normally open, cutting off the coil voltage of relay K4 and relay K5, and then cutting off the coil voltage of the electric pump M1 contactor and the folding ladder extension solenoid valve Y2, causing the coil of the electric pump contactor to lose power, the motor of the electric pump to stop working, and the folding ladder extension solenoid valve Y2 to lose power and close again.

[0042] Preferably, when the folding ladder is controlled to fold by the folding ladder control system, the first switch or the second switch is operated and maintained. The first switch or the second switch controls the coil of the third relay and the coil of the fourth relay in the distribution box. After the coil of the third relay is energized, the normally open contact of the second passive magnetic switch is energized to control the coil of the contactor of the electric pump. After the coil of the contactor is energized, the normally open contact ... electric pump. The system total power drives the motor of the electric pump to work, and the electric pump drives the hydraulic cylinder to operate, so that the hydraulic cylinder drives the folding ladder to operate. After the coil of the fourth relay is energized, the normally open contact of the second passive magnetic switch is energized to control the coil of the contactor of the electric pump. After the coil of the contactor is energized, the normally open contact of the second passive magnetic switch is energized to control the coil of the contactor of the electric pump. The system total power drives the motor of the electric pump to work, and the electric pump drives the hydraulic cylinder to operate, so that the hydraulic cylinder drives the folding ladder to operate. After the coil of the fourth relay is energized, the normally open contact of the second passive magnetic switch is energized to control the coil of the second folding ladder extension solenoid valve. After the second folding ladder extension solenoid valve is energized, the folding ladder extension cylinder performs the corresponding folding action.

[0043] Further preferably, when the folding ladder is folded into place, the state of the second passive magnetic switch is triggered to change, and the normally closed contact of the second passive magnetic switch becomes normally open, cutting off the coil voltage of the third relay and the fourth relay, thereby cutting off the coil voltage of the contactor of the electric pump and the second folding ladder extension solenoid valve, so that the coil of the contactor of the electric pump loses power, the motor of the electric pump stops working, and the second folding ladder extension solenoid valve loses power and closes again.

[0044] Please refer to Figure 3 Another implementation process shown in the example is that when the operator folds the folding ladder on the turntable, the second switch needs to be operated to keep the folding gear of the folding ladder. At this time, the coils of the third relay (for example, relay K2) and the fourth relay (for example, relay K3) built into the distribution box are energized, and the normally open contact of relay K2 becomes normally closed and conducts, so that the coil of the contactor of the electric pump M1 is energized, the normally open contact of the contactor becomes normally closed, the electric pump motor is energized, and starts to rotate, thereby driving the motor of the electric pump to rotate. After the coil of relay K3 is energized, the normally open contact becomes normally closed, the folding solenoid valve of the folding ladder is energized and conducts, and the hydraulic oil flows into the hydraulic cylinder through the solenoid valve to perform the folding action. During the folding process of the folding ladder, the sound and light alarm can flash or make a sound after being energized to remind the on-site personnel to pay attention to safety.

[0045] Further, after the folding ladder is folded into place, the trigger state of the second passive magnetic switch (for example, the passive magnetic switch SQ1) changes, and the normally closed contact becomes a normally open state. At this time, the relays K2 and K3 coils lose power. The normally open contact of K2 changes from a closed state to a normally open state, the coil of the contactor of the electric pump M1 loses power, and the contact of the contactor changes from a closed state to a normally open state, and the motor loses power and stops rotating. After the coil of the relay K3 loses power, the normally open contact is disconnected, the second folding ladder folding solenoid valve (for example, the folding ladder folding solenoid valve Y1) loses power, and the folding ladder cylinder stops moving. At this time, the normally open contact of the passive magnetic power switch SQ1 becomes a normally closed state, and the folding into place signal is transmitted to the controller, and the controller sends the signal to the display screen through the bus, and the display screen can feedback the state of the folding ladder being folded into place. Then, the controller can make a judgment based on the signal that the folding ladder has been folded into place, allowing the operating machine to walk or the turntable to rotate, etc. At the same time, the display screen displays the folding state of the folding ladder on the main screen to prompt the operator to perform the above operations. The controller can control the coil of the relay K1 by outputting a high level, and the normally closed contact becomes normally open. At this time, the first switch and the second switch of the folding ladder are invalid due to no power input.

[0046] Please refer to Figure 2 Preferably, the control system may further include a controller and a display. The controller is connected to the passive magnetic switch and is used to receive a state signal of the passive magnetic switch; the display is used to display the operating state of the folding ladder.

[0047] The controller preferably in the embodiment of the present invention can also be used to: when the working machine is performing a walking or rotating action, control the folding ladder to be unable to perform a folding or extending action; and when the operating state of the folding ladder shows that the folding ladder is in an unfolded state, control the working machine to be unable to perform a walking or rotating action.

[0048] Continuing with the above example, when the folding ladder extension solenoid valve Y2 loses power and is closed again, the normally open contact of the passive magnetic switch SQ2 becomes normally closed and transmits the signal to the controller; the controller sends the signal to the display screen through the bus, and the main interface of the display screen can display the folding ladder in the extended position. At this time, when the controller detects that the operating machine has input actions such as walking or turntable rotation, the controller will perform logical operations to limit walking or turntable rotation, and at the same time, the operation result can be displayed on the display screen interface, prompting the operator to fold the folding ladder before performing the above actions.

[0049] Accordingly, the embodiment of the present invention controls the operation of the actuator through a first switch disposed at the lower part of the folding ladder turntable of the working machine to drive the folding ladder to fold and extend; and controls the operation of the actuator through a second switch disposed above the folding ladder turntable of the working machine to drive the folding ladder to fold. Without the need for the operator to manually climb into the cabin of the working machine to activate the power-on switch, the folding ladder can be directly operated to extend and fold, thereby improving the convenience of the folding ladder operation and reducing the risk of falling caused by the operator's need to manually climb the working machine; it can also facilitate the operator to control the folding ladder on the folding ladder turntable of the working machine.

[0050] Furthermore, the embodiments of the present invention can use a passive magnetic switch with a normally open contact and a normally closed contact to control the extension or folding action of the folding ladder, sense the running state of the folding ladder, and notify the controller of the running state of the folding ladder. When the folding ladder is unfolded, the controller cannot perform actions such as walking or rotating of the operating machine, or when the operating machine is walking or rotating, the folding ladder cannot be extended, thereby avoiding the risk of the folding ladder being damaged by the turntable or hard objects on the ground.

[0051] The passive magnetic switch of the embodiment of the present invention may include a normally open contact and a normally closed contact. The normally closed contact can be used to conduct when there is an input signal, and at the same time, start the switching circuit when the folding ladder is fully executed; the normally open contact can transmit a signal to the controller when the action is fully executed, so that the controller performs a logical operation and transmits the operating status of the folding ladder to the display screen. The passive magnetic switch can also separately use sensors with multiple normally open contacts and multiple normally closed contacts to control and sense the operating status of the folding ladder.

[0052] An embodiment of the present invention further provides an operating machine, which may include the above-mentioned folding ladder control system.

[0053] For example, the power of the control system can come from a lead-acid battery, which can not only provide power for the electric pump to drive the hydraulic cylinder to perform actions, but also provide power for all electrical components of the control system to ensure reliable operation of the electrical components. Figure 2 The preferred control system may include electrical components such as a passive magnetic switch, a solenoid valve, a distribution box, a first switch, a second switch, an audible and visual alarm, a controller, and a display screen. The exemplary implementation process may include:

[0054] S1. When ultra-large operating machinery (for example, ultra-large excavators) is continuously operating in an open-pit mine, the main power switch is generally in a closed state, and during the intervals between shifts, the operator generally folds up the folding ladder to prevent unrelated personnel on site from entering the operating machinery.

[0055] S2, when the operator needs to enter the operating machine for operation, he can operate the folding ladder at the bottom of the operating machine turntable to extend the pull rope downward.

[0056] S3, stretches the normally closed contact of the passive magnetic switch to conduct, and at the same time controls the two relays in the distribution box to be energized. One of the relays controls the contactor coil of the electric pump, the normally open contact of the contactor is closed, and the electric pump is energized to work.

[0057] S4, another relay controls the folding ladder extension solenoid valve, the folding ladder extension solenoid valve is energized, and the hydraulic oil drives the folding ladder extension cylinder to perform extension movement.

[0058] S5, the sound and light alarm is energized and can emit an alarm sound and / or flash a yellow light to remind on-site personnel to pay attention to safety.

[0059] S6, after the folding ladder is extended to the full position, the normally closed contacts of the passive magnetic switch are disconnected, the above two relays lose power, the electric pump does not work, the extension solenoid valve is disconnected, and the sound and light alarm stops alarming and flashing.

[0060] S7, after the operator enters the cab through the folding ladder and powers on, the folding ladder extension signal is sent to the controller, and the folding ladder extension status is displayed on the display. At this time, the walking and rotating actions of the operating machine are restricted through the control program.

[0061] S8, during operation, the operator can perform the folding action of the folding ladder by operating the second switch near the folding ladder on the upper part of the turntable.

[0062] S9, the normally closed contacts of the folding passive magnetic switch are energized, one of the relays controls the contactor coil of the electric pump, the normally open contacts of the contactor are closed, and the electric pump is energized to work.

[0063] S10, another relay controls the folding solenoid valve of the folding ladder, the solenoid valve is energized and the hydraulic oil drives the folding cylinder of the folding ladder to perform folding movement.

[0064] S11, the sound and light alarm is energized and can emit an alarm sound and / or flash a yellow light to remind on-site personnel to pay attention to safety.

[0065] S12, after the folding ladder is folded into place, the normally closed contacts of the passive magnetic switch are disconnected, the above two relays lose power, the electric pump does not work, the folding solenoid valve is disconnected, and the sound and light alarm stops alarming and flashing.

[0066] S13, the folding ladder is folded into place signal is sent to the controller, and the folding state of the folding ladder is displayed on the display screen. At this time, the operation machine walking and rotating actions are controlled by the control program.

[0067] Accordingly, the working machine described in the embodiment of the present invention includes a folding ladder control system, which controls the operation of the actuator through a first switch disposed at the lower part of the folding ladder turntable of the working machine to drive the folding ladder to fold; and also controls the operation of the actuator through a second switch disposed above the folding ladder turntable of the working machine to drive the folding ladder to fold. It is convenient for the operator to control the folding ladder on the folding ladder turntable of the working machine. The operator can directly operate the extension and folding actions of the folding ladder without the need for the operator to climb to the upper cabin of the working machine by hand to start the power-on switch, thereby improving the convenience of the folding ladder operation and reducing the risk of falling caused by the operator needing to climb the working machine by hand.

[0068] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0069] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A folding ladder control system, characterized in that: The folding ladder control system comprises: An actuator, connected to a folding ladder of the operating machine, for driving the folding ladder to extend and fold; A first switch, disposed at the lower part of the turntable of the working machine, is used by an operator on the ground to control the operation of the actuator to drive the folding ladder to fold and extend; and The second switch is arranged above the turntable of the working machine, and is used by the operator on the turntable of the working machine to control the operation of the actuator to drive the folding ladder to fold and extend.

2. The folding ladder control system according to claim 1, characterized in that: The first switch includes a folding switch and an extending switch, The folding switch is used to control the operation of the actuator to drive the folding ladder to fold. The extension switch is used to control the operation of the actuator to drive the folding ladder to extend.

3. The folding ladder control system according to claim 1, characterized in that: The actuator includes a distribution box, an electric pump, a hydraulic cylinder, a solenoid valve switch and a passive magnetic switch. The first switch and the second switch are connected to the power distribution box, the electric pump and the hydraulic cylinder in sequence, and the hydraulic cylinder is connected to the folding ladder. The first switch and the second switch control the electric pump by controlling the relay built into the power distribution box, and the electric pump drives the hydraulic cylinder to operate, so that the hydraulic cylinder drives the folding ladder to operate. The solenoid valve switch is connected between the electric pump and the hydraulic cylinder. The solenoid switch valve includes a folding solenoid valve for the folding ladder and a folding solenoid valve for the extension of the folding ladder. The folding solenoid valve of the folding ladder is used to control the oil circuit of the hydraulic cylinder to drive the folding ladder to fold, and the extension solenoid valve of the folding ladder is used to control the oil circuit of the hydraulic cylinder to drive the folding ladder to extend. The passive magnetic switch is used to sense the running state of the folding ladder, and the passive magnetic switch includes a folded-in-place passive magnetic switch and an extended-in-place passive magnetic switch.

4. The folding ladder control system according to claim 3, characterized in that: When the folding ladder is controlled to extend by the folding ladder control system, the first switch or the second switch is operated and maintained, The first switch or the second switch controls the coil of the first relay and the coil of the second relay in the power distribution box, After the coil of the first relay is energized, the normally open contact of the first passive magnetic switch is energized to control the coil of the contactor of the electric pump. After the coil of the contactor of the electric pump is energized, the normally open contact is energized to control the coil of the electric pump. The system main power drives the motor of the electric pump to work, and the electric pump drives the hydraulic cylinder to operate, so that the hydraulic cylinder drives the folding ladder to operate. After the coil of the second relay is energized, the normally open contact of the first passive magnetic switch is attracted and turned on, and the first folding ladder extension solenoid valve is energized. After the first folding ladder extension solenoid valve is energized, the folding ladder extension cylinder performs a corresponding extension action.

5. The folding ladder control system according to claim 4, characterized in that: When the folding ladder is extended into position, the state of the first passive magnetic switch is changed, and the normally closed contact of the first passive magnetic switch is changed to a normally open state, thereby cutting off the coil voltage of the first relay and the second relay, and further cutting off the coil voltage of the contactor of the electric pump and the first folding ladder extension solenoid valve, so that the coil of the contactor of the electric pump loses power, the motor of the electric pump stops working, and the first folding ladder extension solenoid valve loses power and closes again.

6. The folding ladder control system according to claim 3, characterized in that: When the folding ladder is controlled to be folded by the folding ladder control system, the first switch or the second switch is operated and maintained, The first switch or the second switch controls the coil of the third relay and the coil of the fourth relay in the power distribution box. After the coil of the third relay is energized, the normally open contact of the second passive magnetic switch is energized to control the coil of the contactor of the electric pump. After the coil of the contactor of the electric pump is energized, the normally open contact is energized to control the coil of the contactor of the electric pump. The system main power drives the motor of the electric pump to work, and the electric pump drives the hydraulic cylinder to operate, so that the hydraulic cylinder drives the folding ladder to operate. After the coil of the fourth relay is energized, the normally open contact of the second passive magnetic switch is attracted and turned on, and the second folding ladder extension solenoid valve is energized. After the second folding ladder extension solenoid valve is energized, the folding ladder extension cylinder performs the corresponding folding action.

7. The folding ladder control system according to claim 6, characterized in that: When the folding ladder is folded into place, the state of the second passive magnetic switch is triggered to change, and the normally closed contact of the second passive magnetic switch becomes normally open, cutting off the coil voltage of the third relay and the fourth relay, thereby cutting off the coil voltage of the contactor of the electric pump and the second folding ladder extension solenoid valve, so that the coil of the contactor of the electric pump loses power, the motor of the electric pump stops working, and the second folding ladder extension solenoid valve loses power and closes again.

8. The folding ladder control system according to claim 3, characterized in that: The control system also includes a controller and a display. The controller is connected to the passive magnetic switch and is used to receive a state signal of the passive magnetic switch. The display is used to display the operating status of the folding ladder.

9. The folding ladder control system according to claim 8, characterized in that: The controller is also used for: When the working machine is performing a walking or rotating action, controlling the folding ladder to be unable to perform a folding or extending action; and When the operating state of the foldable ladder indicates that the foldable ladder is in the unfolded state, the working machine is controlled so as not to be able to perform a walking or a rotating action.

10. A working machine, characterized in that: The working machine comprises the folding ladder control system according to any one of claims 1 to 9.

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