A gangway system, control method and engineering machine

Abstract

The application discloses a boarding ladder system, a control method and engineering machinery, which comprises a base, a turnover ladder, a lifting oil cylinder, a locking device, a plurality of sensors, an electronic pump, a staircase control valve group and a controller; the base is fixed on the side of a vehicle body; one end of the turnover ladder is hinged to the base; two ends of the lifting oil cylinder are respectively hinged to the base and the turnover ladder; the locking device is installed on the upper part of the vehicle body and is used for locking the turnover ladder; the plurality of sensors are installed on the base and are used for detecting position information of the turnover ladder, and are installed in the locking device and are used for detecting position information of a locking guide rod; the electronic pump is used for providing hydraulic power; and the staircase control valve group is used for realizing direction switching and closing of a hydraulic loop of the lifting oil cylinder and the locking cylinder. The application can facilitate personnel to control the downstroke and upstroke of the turnover ladder through the controller, facilitates personnel to get on the vehicle when the turnover ladder is at the lowest position of the downstroke, and locks the turnover ladder when the turnover ladder is at the highest position of the upstroke, thereby improving the safety of the boarding ladder system.

Description

TECHNICAL FIELD

[0001] The present application relates to a boarding ladder system, in particular to a boarding ladder system applied in the field of engineering machinery, which has a base, a turnover ladder, a lifting cylinder, a locking device, a sensor, an electronic pump, a staircase control valve group, a controller and other components. BACKGROUND

[0002] On large engineering vehicles, especially on super-large engineering machinery, the cab and the maintenance platform are relatively high from the ground (generally more than 3 meters), and the driver or the maintenance and detection personnel must use a boarding ladder system to enter the cab or the maintenance platform. The ordinary fixed ladder or inclined ladder cannot carry tools or maintenance parts to climb the ladder because the slope is too steep, which greatly affects the safety and comfort of personnel getting on and off the vehicle. At the same time, the ordinary hydraulic-driven turnover ladder does not have a locking structure and does not have a buffering function, and the boarding ladder system has poor reliability and high failure rate, which affects the equipment attendance rate.

[0003] The purpose of the present application is to overcome one or more of the above problems. SUMMARY

[0004] The present application is proposed according to the above status, and the purpose is to provide a boarding ladder system and a control method, which ensures that the driver or the maintenance and detection personnel safely and conveniently enter the cab or the maintenance platform through a ladder with a smaller slope, and improves the reliability of the boarding ladder system.

[0005] The present application is implemented according to the following technical scheme:

[0006] The present application discloses a boarding ladder system in the first aspect, comprising:

[0007] a base fixed on the side of the vehicle body;

[0008] a turnover ladder hinged at one end to the base;

[0009] a lifting cylinder hinged at both ends to the base and the turnover ladder, used for uplink and downlink of the turnover ladder;

[0010] a locking device installed on the upper part of the vehicle body, used for locking the turnover ladder when the turnover ladder is uplinked to the highest position to prevent falling back;

[0011] a plurality of sensors installed on the base for detecting position information of the turnover ladder, and installed in the locking device for detecting position information of the locking guide rod;

[0012] an electronic pump providing hydraulic power for the lifting cylinder and the locking cylinder in the locking device;

[0013] a staircase control valve group used for realizing direction switching and closing of the hydraulic circuit of the lifting cylinder and the locking cylinder;

[0014] A controller is used to control the action of the landing gate system, which can control the opening and closing of the electronic pump according to the signal of the position sensor, control the switching of the hydraulic circuit in the escalator control valve group, and indirectly control the extension and retraction of the lifting cylinder and the locking cylinder.

[0015] In some embodiments, the turnover ladder comprises:

[0016] A ladder body is hinged at one end to the base, and the side of the ladder body is provided with a locking rod pinhole;

[0017] An inductive sheet is installed on the side of the ladder body to generate a position signal when the ladder body is ascending to the highest position.

[0018] In some embodiments, the locking device comprises:

[0019] A locking cylinder is hinged to the base plate support frame;

[0020] A guide block is installed on the base plate support frame for guiding;

[0021] A locking rod is hinged at one end to the extension rod of the locking cylinder, the rod body is limited in the guide block, and the other end is inserted into the locking rod pinhole of the ladder body through the extension of the locking cylinder, which plays a limiting role in the rotation direction of the turnover ladder.

[0022] In some embodiments, the turnover ladder further comprises a positioning pin installed on the side of the ladder body for guiding and limiting when the ladder body is ascending to the highest position; the locking device further comprises a limiting block fixed on the base plate support frame, which has a guide groove, when the turnover ladder is rotated to the stowed position, the positioning pin can slide into the limiting block, which plays a guiding and limiting role, preventing the turnover ladder from tilting laterally.

[0023] In some embodiments, there are a total of 6 sensors, sensor I, sensor II, sensor III installed on the base, sensor IV, sensor V, sensor VI installed on the locking device; when sensor I and sensor II receive the ladder body position signal, the controller controls the electronic pump to output low hydraulic flow, reducing the turnover ladder rotation speed; when sensor I and sensor II both lose the ladder body position signal, the controller controls the electronic pump to output high hydraulic flow, increasing the turnover ladder rotation speed; when sensor III and sensor IV receive the ladder body position signal, the controller controls the escalator control valve group to cut off the hydraulic flow of the lifting cylinder, keeping the turnover ladder in a stopped state; when sensor V, sensor VI receive the position signal of the locking rod, the controller controls the escalator control valve group to cut off the hydraulic flow of the locking cylinder, keeping the locking rod in a stopped state.

[0024] In some embodiments, it further comprises:

[0025] The collision block is installed on the base and contacts with the ladder body when the turnover ladder is lowered to the lowest position, buffering the impact when the turnover ladder is lowered.

[0026] In some embodiments, the controller has control buttons for operating the actions of the passenger loading bridge system; the control buttons include an emergency stop button, an up button, a down button, a locking button and an unlocking button.

[0027] In some embodiments, the electronic pump is installed inside the vehicle body, and the escalator control valve group is installed inside the base; the electronic pump and the escalator control valve group are connected to the controller through a wire harness and controlled by the instruction signal of the controller; the electronic pump is connected to the escalator control valve group through a hydraulic pipeline, and the escalator control valve group is connected to the lifting cylinder and the locking cylinder through a hydraulic pipeline, providing hydraulic power for the passenger loading bridge system.

[0028] The second aspect of the present application discloses a control method based on the above-mentioned passenger loading bridge system:

[0029] The controller can collect the signals of the sensors, determine the position information of the turnover ladder and the locking cylinder according to the signals, and control the actions of the electronic pump and the escalator control valve group according to the control button signals, thereby realizing the control of the passenger loading bridge system.

[0030] When the up button is pressed, the turnover ladder is controlled to go up until the highest point; when the down button is pressed, the turnover ladder is controlled to go down until the lowest point; when the locking button is pressed, the locking rod is extended and inserted into the ladder body, thereby realizing the position limiting of the turnover ladder; when the unlocking button is pressed, the locking rod is retracted and withdrawn from the ladder body, thereby realizing the unlocking of the position limiting of the turnover ladder; when the emergency stop button is pressed, the passenger loading bridge system is stopped; when the emergency stop button is pulled out, the passenger loading bridge system resumes and can continue to be operated.

[0031] The third aspect of the present application discloses an engineering machine provided with the above-mentioned passenger loading bridge system.

[0032] Compared with the prior art, the present application has the following advantages:

[0033] The present application can facilitate personnel to control the lowering and raising of the turnover ladder through the controller, facilitate personnel to get on the vehicle when the turnover ladder is at the lowest position, and lock the turnover ladder through the locking device when the turnover ladder is at the highest position, thereby improving the safety of the passenger loading bridge system. BRIEF DESCRIPTION OF DRAWINGS

[0034] The accompanying drawings are part of the present application and serve to provide a further understanding of the present application, and the illustrative embodiments of the present application and their descriptions serve to explain the present application but do not constitute an improper limitation on the present application. Obviously, the accompanying drawings in the following description are only some embodiments, and other drawings can be obtained from these drawings by those skilled in the art without creative labor.

[0035] In the drawings:

[0036] Figure 1 It is the whole structure schematic diagram of the boarding ladder system of the application;

[0037] Figure 2 It is the sensor installation schematic diagram on the base;

[0038] Figure 3 It is the schematic diagram of the turnover ladder side structure and the collision block installation schematic diagram on the base;

[0039] Figure 4 It is the schematic diagram of the locking device structure in the locking state;

[0040] Figure 5 It is the schematic diagram of the positioning pin sliding into the limiting block;

[0041] Figure 6 It is the electronic pump and escalator control valve group installation schematic diagram;

[0042] Figure 7 It is the schematic diagram of the controller control button;

[0043] Figure 8 It is the schematic diagram of the turnover trajectory of the boarding ladder system of the application.

[0044] In the drawings: 1, base, 2, vehicle body, 3, turnover ladder, 4, lifting oil cylinder, 5, locking device, 7, electronic pump, 8, escalator control valve group, 9, collision block, 10 controller, 3-1, ladder body, 3-2 positioning lock, 3-3, sensing sheet, 5-1 locking oil cylinder, 5-2 guide block, 5-3, bottom plate support frame, 5-4, locking rod, 5-5, limiting block, 6-1, sensor I, 6-2, sensor II, 6-3, sensor III, 6-4, sensor IV, 6-5, sensor V, 6-6, sensor VI, 10-1, emergency stop button, 10-2, up button, 10-3, down button, 10-4, locking button, 10-5, unlocking button.

[0045] It should be noted that these drawings and written descriptions are not intended to limit the scope of the concept of the application in any way, but to illustrate the concept of the application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical scheme and advantages of the embodiments of the application more clear, the technical scheme in the embodiments will be described clearly and completely below in conjunction with the drawings in the embodiments of the application. The following embodiments are used to illustrate the application, but not to limit the scope of the application.

[0047] In the description of the present application, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0048] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0049] As shown in Figures 1 to 8 A stair system, including a base 1, a turnover ladder 3, a lifting cylinder 4, a locking device 5, sensors 6-1, 6-2, 6-3, 6-4, 6-5, 6-6, an electronic pump 7, a staircase control valve group 8, a collision block 9 and a controller 10; the base 1 is fixed on the side of the engineering vehicle body 2 by bolts; one end of the turnover ladder 3 is connected to the base 1 through a hinge; the two ends of the lifting cylinder 4 are connected to the base 1 and the turnover ladder 3 through hinges respectively, for the up and down of the turnover ladder; the locking device 5 is installed on the upper part of the engineering vehicle body 2, and is used to lock the turnover ladder 3 when the turnover ladder 3 is up to the highest position to prevent falling back; the sensors 6-1, 6-2, 6-3, 6-4, 6-5, 6-6 are installed on the base 1 to detect the position information of the turnover ladder, and are installed in the locking device 5 to detect the position information of the locking guide rod; the electronic pump 7 provides hydraulic power for the lifting cylinder 4 and the locking cylinder 5-1 in the locking device 5; the staircase control valve group 8 is used to realize the direction switching and closing of the hydraulic circuit of the lifting cylinder 4 and the locking cylinder 5-1; the collision block 9 is installed on the base 1 and can be adjusted up and down, and when the turnover ladder 3 is down to the lowest position, the collision block contacts the turnover ladder to play a role of collision buffer; the controller 10 is installed beside the passage platform on the vehicle body 2, and personnel can control the action of the stair system by operating the controller 10, can control the opening and closing of the electronic pump 7 according to the signal of the position sensor, control the switching of the hydraulic circuit in the staircase control valve group 8, and indirectly control the extension and retraction of the lifting cylinder 4 and the locking cylinder 5-1.

[0050] As shown in Figure 2As shown, the sensor I 6-1, the sensor II 6-2 and the sensor III 6-3 are fixed on the base 1, and can sense the position signal of the ladder body 3-1 at three different angle positions of the ladder 3 during the ascending and descending of the ladder 3. When the sensor I 6-1 and the sensor II 6-2 receive the position signal of the ladder body 3-1, the controller 10 controls the electronic pump 7 to output low hydraulic flow to reduce the rotation speed of the ladder 3; when the sensor I 6-1 and the sensor II 6-2 lose the position signal of the ladder body 3-1, the controller 10 controls the electronic pump 7 to output high hydraulic flow to increase the rotation speed of the ladder 3; when the sensor III 6-3 receives the lowest position signal of the descending ladder body 3-1, the controller 10 controls the escalator control valve group 8 to cut off the hydraulic flow of the lifting oil cylinder 4, so that the ladder 3 is kept in the stopped state.

[0051] As shown in FIG. 6, the collision block 9 is installed on the base 1 by bolts. Figure 3 As shown in FIG. 6, the collision block 9 is installed on the base 1 by bolts. Figure 3 As shown in FIG. 6, the collision block 9 is installed on the base 1 by bolts.

[0052] Figure 4 As shown in FIG. 6, the collision block 9 is installed on the base 1 by bolts.

[0053] Sensor IV6-4 is mounted on the base plate support frame 5-3. When the tilting escalator is at its highest upward position, it receives the position signal from sensor 3-3. The controller 10 then controls the escalator control valve assembly 8 to cut off the hydraulic flow to the lifting cylinder 4, keeping the tilting escalator 3 at a stop. Sensors V6-5 and VI6-6 are also mounted on the base plate support frame 5-3. When the locking rod is fully extended, sensor V6-5 detects the position signal of the locking rod 5-4. The controller 10 then controls the escalator control valve assembly 8 to cut off the hydraulic flow to the locking cylinder 4, keeping the locking rod 5-4 at a stop. When the locking rod is fully retracted, sensor VI6-6 detects the position signal of the locking rod 5-4. The controller 10 then controls the escalator control valve assembly 8 to cut off the hydraulic flow to the locking cylinder 4, keeping the locking rod 5-4 at a stop.

[0054] Figure 5 This is a perspective view showing the tilting ladder at its highest upward position with the locking cylinder extended and locked. The limiting block 5-5 is fixed to the lower part of the base plate support frame 5-3 and has a guide groove structure inside, serving a guiding and positioning function. Figure 5 As shown, the locating pin 3-2 has slid into the guide groove of the limiting block 5-5.

[0055] like Figure 6 As shown, the electronic pump 7 is installed inside the vehicle body 2, and the escalator control valve assembly 8 is installed inside the base 1. The electronic pump 7 and the escalator control valve assembly 8 are connected to the controller 10 via wiring harnesses and are controlled by command signals from the controller 10. The electronic pump 7 is connected to the escalator control valve assembly 8 via hydraulic lines, and the escalator control valve assembly 8 is connected to the lifting cylinder 4 and the locking cylinder 5-1 via hydraulic lines, providing hydraulic power to the boarding ladder system. Sensors 6-1, 6-2, 6-3, 6-4, 6-5, and 6-6 are connected to the controller 10 via wiring harnesses, providing position signals for the tilting ladder 3 and the locking cylinder 5-1.

[0056] like Figure 7As shown, the controller 10 is installed on the engineering vehicle body 2, and is connected with the electronic pump 7, the escalator control valve group 8 and the sensors through the wire harness respectively. The controller 10 is provided with operation buttons, including an emergency stop button 10-1, an up button 10-2, a down button 10-3, a locking button 10-4 and an unlocking button 10-5. The controller 10 can collect the signals of the sensors, and indirectly control the start-stop and flow size switching of the electronic pump 7, the opening and closing and switching of the hydraulic flow in the escalator control valve group 8 through the operation buttons, so as to realize the up and down of the turnover ladder 3, the locking and unlocking of the locking device 5 and the emergency stop of the boarding system. Pressing the up button 10-2, the turnover ladder goes up until the highest point and stops; pressing the down button 10-3, the turnover ladder goes down until the lowest point and stops; pressing the locking button 10-4, the locking rod 5-4 extends and inserts into the insertion hole of the ladder body 3-1 and then stops, so as to realize the turnover ladder limiting; pressing the unlocking button 10-5, the locking rod 5-4 retracts and separates from the ladder body 3-1 and then stops, so as to realize the unlocking of the turnover ladder limiting; pressing the emergency stop button 10-1, the boarding ladder system stops and locks; pulling out the emergency stop button 10-1, the boarding ladder system recovers and can continue to be operated.

[0057] Specific operation method and working process:

[0058] S1: When the turnover ladder 3 is located at the lowest position, the controller 10 collects the signals of the ladder body 3-1 detected by the sensor II 6-2 and the sensor III 6-3, and at this time, the up button 10-2 is pressed, the controller controls the electronic pump 7 to start, controls the escalator control valve group 8 to open the extension hydraulic circuit of the lifting cylinder, realizes the extension of the lifting cylinder, and pushes the turnover ladder to go up.

[0059] During the up process, when the sensor II 6-2 loses the signal of the ladder body 3-1, the controller 10 controls the electronic pump 7 to output high hydraulic flow, so as to improve the up speed of the turnover ladder.

[0060] During the continuous up process, when the sensor I 6-1 detects the signal of the ladder body 3-1, the controller 10 controls the electronic pump 7 to output low hydraulic flow, so as to reduce the up speed of the turnover ladder.

[0061] During the continuous up process, when the sensor IV 6-4 detects the signal of the upper sensing sheet 3-3 of the turnover ladder, the controller 10 controls the electronic pump 7 to stop working, controls the escalator control valve group 8 to close the hydraulic circuit of the lifting cylinder, so as to keep the turnover ladder in the stopped state, and then the up button 10-2 is released.

[0062] S2: The locking button 10-4 is pressed, the controller 10 controls the electronic pump 7 to start, controls the escalator control valve 8 to open the extension hydraulic circuit of the locking cylinder, and pushes the locking rod 5-4 to insert into the insertion hole of the ladder body 3-1.

[0063] During the insertion of the locking rod 5-4, when the sensor V 6-5 detects the locking rod position signal, the controller 10 controls the electronic pump 7 to stop working, controls the escalator control valve group 8 to close the locking oil cylinder hydraulic circuit, and keeps the locking rod in the stop state, and then releases the locking button 10-4.

[0064] At this point, the up operation of the turnover ladder and the locking operation are completed.

[0065] S3: In the up locking state of the turnover ladder, press the unlocking button 10-5, and the controller 10 controls the electronic pump 7 to start working, controls the escalator control valve group 8 to open the locking oil cylinder contraction hydraulic circuit, and drives the locking rod 5-4 to retract.

[0066] During the retraction of the locking rod 5-4, when the sensor VI 6-6 detects the locking rod position signal, the controller 10 controls the electronic pump 7 to stop working, controls the escalator control valve group 8 to close the locking oil cylinder hydraulic circuit, and keeps the locking rod in the stop state, and then releases the unlocking button 10-5.

[0067] S4: Press the down button 10-3, and the controller 10 controls the electronic pump 7 to start working, controls the escalator control valve group 8 to open the lifting oil cylinder contraction hydraulic circuit, realizes the contraction of the lifting oil cylinder, and realizes the down operation of the turnover ladder.

[0068] During the down operation, when the sensor I 6-1 loses the ladder body 3-1 signal, the controller 10 controls the electronic pump 7 to output high hydraulic flow, and increases the down speed of the turnover ladder.

[0069] During the continuous down operation, when the sensor II 6-2 detects the ladder body 3-1 signal, the controller 10 controls the electronic pump 7 to output low hydraulic flow, and reduces the down speed of the turnover ladder.

[0070] During the continuous down operation, when the sensor III 6-3 detects the ladder body 3-1 signal, the controller 10 controls the electronic pump 7 to stop working, controls the escalator control valve group 8 to close the lifting oil cylinder hydraulic circuit, and keeps the turnover ladder in the stop state, and then releases the down button 10-3.

[0071] At this point, the down operation of the turnover ladder is completed.

[0072] S5: During the operation of the boarding ladder, the emergency stop button 10-1 can be pressed at any time to stop the boarding ladder and keep it in the stop state. If the boarding ladder is to be restored to operation, the emergency stop button 10-1 needs to be unlocked.

[0073] In the specification provided herein, a large number of specific details are described. However, it can be understood that the embodiments of the present application can be practiced without these specific details. In some examples, well-known methods, structures and techniques are not shown in detail in order not to obscure the understanding of the present specification.

[0074] Furthermore, those skilled in the art will recognize that, while certain embodiments described herein include certain features that are not included in other embodiments, combinations of those features from different embodiments can also be used in accordance with the teachings herein and form different embodiments. For example, in the above embodiments, those skilled in the art will recognize that the features can be used in combination in accordance with the teachings herein and the problems to be solved by the present application.

[0075] The above description is only preferred embodiments of the present application and is not intended in any way to limit the present application. Although the present application has been disclosed with reference to the preferred embodiments, the present application is not limited to the preferred embodiments. Any modification or equivalent variation of the above embodiments that does not depart from the scope of the present application is intended to be included in the scope of the present application.

Claims

1. A boarding stair system, characterized in that The utility model relates to a kind of vehicle boarding ladder system, including: Base (1), fixed in the side of vehicle body (2); Turnover ladder (3), one end is hinged with base (1); Lifting oil cylinder (4), two ends are respectively hinged with base (1) and turnover ladder (3), for the uplink and downlink of turnover ladder; Locking device (5), it is installed on the upper portion of vehicle body (2), when turnover ladder (3) uplink to the highest position, for locking turnover ladder (3), prevent back fall; Six sensors, sensor I (6-1), sensor II (6-2), sensor III (6-3) for detecting the position information of turnover ladder are installed on base (1), sensor IV (6-4), sensor V (6-5), sensor VI (6-6) for detecting the position information of locking guide rod are installed in locking device (5); Electronic pump (7), provide hydraulic power for lifting oil cylinder (4) and locking oil cylinder (5-1) in locking device (5); Escalator control valve group (8), for realizing the direction switching and the closing of the hydraulic circuit of lifting oil cylinder (4) and locking oil cylinder (5-1); Controller (10), for controlling the action of boarding ladder system, can control the opening and closing of electronic pump (7) according to the signal of position sensor, control the switching of hydraulic circuit in escalator control valve group (8), indirectly control the extension and contraction of lifting oil cylinder (4) and locking oil cylinder (5-1); When sensor I (6-1) and sensor II (6-2) receive ladder body (3-1) position signal, controller (10) controls electronic pump (7) to output low hydraulic flow, reduce turnover ladder (3) turnover speed; When sensor I (6-1) and sensor II (6-2) all lose ladder body (3-1) position signal, controller (10) controls electronic pump (7) to output high hydraulic flow, improve turnover ladder (3) turnover speed; When sensor III (6-3) and sensor IV (6-4) receive ladder body (3-1) position signal, controller (10) controls escalator control valve group (8) to cut off the hydraulic flow of lifting oil cylinder (4), so that turnover ladder (3) keeps stop state; When sensor V (6-5), sensor VI (6-6) receive the position signal of locking rod (5-4), controller (10) controls escalator control valve group (8) to cut off the hydraulic flow of locking oil cylinder (4), so that locking rod (5-4) keeps stop state.

2. A stairway system according to claim 1, wherein, The turnover ladder (3) includes: Ladder body (3-1), one end is hinged with base (1), and locking rod bolt hole is arranged on the side of ladder body; Induction sheet (3-3), it is installed on the side of ladder body (3-1), for sensor IV (6-4) to generate position signal when ladder body uplink to the highest position.

3. A stairway system according to claim 2, wherein, The locking device (5) includes: Locking oil cylinder (5-1), cylinder body is hinged on bottom plate support frame (5-3); Guide block (5-2), it is installed on bottom plate support frame (5-3), and plays a guiding role; Locking rod (5-4), one end of which is hinged to the telescopic rod of the locking oil cylinder (5-1), the rod body is limited in the guide block (5-2), the other end is inserted into the locking rod pinhole of the ladder body (3-1) through the extension of the locking oil cylinder (5-1), and the rotation direction of the folding ladder (3) is limited.

4. The stair climbing system according to claim 3, characterized in that: The folding ladder (3) further comprises a positioning pin (3-2) installed on the side of the ladder body (3-1) for guiding and limiting the ladder body (3-1) when it is ascending to the highest position; The locking device (5) further comprises a limiting block (5-5) fixed on the bottom plate support frame (5-3), which has a guide groove, when the folding ladder (3) rotates to the stowed position, the positioning pin (3-2) can slide into the limiting block (5-5) to guide and limit the folding ladder from tilting sideways.

5. A stairway system according to claim 1, wherein, Further comprising: A collision block (9) is installed on the base (1), when the folding ladder (3) is descending to the lowest position, the collision block (9) contacts with the ladder body (3-1) to buffer the impact when the folding ladder is descending.

6. The stair climbing system according to claim 1, characterized in that: The controller (10) has control buttons for operating the actions of the stair climbing system; The control buttons include an emergency stop button (10-1), an ascending button (10-2), a descending button (10-3), a locking button (10-4) and an unlocking button (10-5).

7. The stair climbing system according to claim 1, characterized in that: The electronic pump (7) is installed inside the vehicle body (2), and the escalator control valve group (8) is installed inside the base (1); The electronic pump (7) and the escalator control valve group (8) are connected to the controller (10) through a wire harness respectively, and are controlled by the instruction signal of the controller (10); The electronic pump (7) is connected to the escalator control valve group (8) through a hydraulic pipeline, and the escalator control valve group (8) is connected to the lifting oil cylinder (4) and the locking oil cylinder (5-1) through a hydraulic pipeline, providing hydraulic power for the stair climbing system.

8. A control method for the stair climbing system according to claim 1, characterized in that: The controller (10) can collect signals from sensors, determine the position information of the folding ladder (3) and the locking oil cylinder (5-1) according to the signals, and control the actions of the electronic pump (7) and the escalator control valve group (8) according to the control button signals to realize the control of the stair climbing system: When the ascending button (10-2) is pressed, the folding ladder is controlled to ascend until the highest point; when the descending button (10-3) is pressed, the folding ladder is controlled to descend until the lowest point; when the locking button (10-4) is pressed, the locking rod (5-4) is extended and inserted into the ladder body (3-1) to realize the limiting of the folding ladder; when the unlocking button (10-5) is pressed, the locking rod (5-4) is retracted and withdrawn from the ladder body (3-1) to realize the unlocking of the folding ladder; when the emergency stop button (10-1) is pressed, the stair climbing system is locked for emergency stop; when the emergency stop button (10-1) is pulled out, the stair climbing system resumes and can continue to be operated.

9. A working machine, characterized by: a landing stair system according to any one of claims 1 to 7 is installed.

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