Cab rollover safety control method, system and excavator

Abstract

The present invention provides a cab rollover safety control method, system, and excavator. The method includes the following steps: obtaining the extension length of the lifting cylinder; obtaining the inclination angle of the boom; if the extension length of the lifting cylinder is greater than a preset safety extension length, determining that the cab is in a rollover state; when the cab is determined to be in a rollover state, determining whether the boom inclination angle is within a preset inclination angle range; if the boom inclination angle is not within the preset inclination angle range, controlling an alarm to issue an alarm prompt and controlling the cab to cancel the rollover. On the one hand, the present invention provides an inclination sensor on the boom to monitor the boom posture and promptly issue an alarm when the boom posture is incorrect. On the other hand, a proximity switch is provided between the support rod and the support rod slot to alert maintenance personnel when the support rod is not inserted into the slot and locked.

Description

Technical Field

[0001] The present invention relates to a cab rollover safety control method, system and excavator, and belongs to the technical field of engineering machinery. Background Art

[0002] In the existing field of engineering machinery, for models that need to flip the cab for maintenance, after using the lifting cylinder to lift the cab, on the one hand, when the boom is not in a lowered position, it is easy to collide with the boom and cause damage to the cab. On the other hand, in order to avoid problems such as internal or external leakage of the lifting cylinder that may cause the cab to fall suddenly, a mechanical support rod is provided. By locking the mechanical support rod, the safety of the maintenance personnel is ensured. However, some maintenance personnel still forget to use the mechanical support rod to lock it.

[0003] At present, it mainly depends on the operating habits of maintenance personnel, and it is easy to forget, causing the cab to collide with the boom. If the mechanical support rod is forgotten to be locked, personal safety accidents are more likely to occur.

[0004] Depending on the operating habits of maintenance personnel, it is easy to forget to lock the support rod and lower the boom, causing safety accidents. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a cab flip safety control method, system and excavator, which can intelligently distinguish the cab flip state and issue an alarm to prevent the cab from colliding with the boom when the boom is not in a falling posture when the cab flips, causing damage to the cab.

[0006] To achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0007] In a first aspect, the present invention provides a cab rollover safety control method, the method comprising the following steps:

[0008] Get the extension length of the lifting cylinder;

[0009] Get the boom inclination angle;

[0010] If the extension length of the lifting cylinder is greater than the preset safety extension length, it is determined that the cab is in a flip state;

[0011] When it is determined that the cab is in a flipping state, it is determined whether the boom inclination angle is within a preset inclination angle range. If the boom inclination angle is not within the preset inclination angle range, the alarm is controlled to give an alarm prompt and the cab is controlled to cancel flipping.

[0012] Furthermore, the method further comprises:

[0013] If the extension length of the lifting cylinder is less than or equal to the preset safety extension length, the alarm will be controlled to stop sounding.

[0014] Furthermore, the method further comprises:

[0015] If the boom inclination angle is within the preset inclination angle range, the lifting cylinder is controlled to continue to extend, and the time during which the extension length of the lifting cylinder remains constant is obtained;

[0016] When the time during which the extension length of the lifting cylinder remains constant is less than a preset value T, the lifting cylinder is controlled to continue extending until it reaches the final position.

[0017] Furthermore, the method further comprises:

[0018] When the time that the extension length of the lifting cylinder remains constant is greater than a preset value T, the switching values ​​of the proximity switch A and the proximity switch B installed on the end of the mechanical support rod and the support rod slot are obtained;

[0019] When the switch is in the off state, the control alarm sends out an alarm signal.

[0020] Furthermore, the method further comprises:

[0021] When the time that the extension length of the lifting cylinder remains constant is greater than a preset value T, the switching values ​​of the proximity switch A and the proximity switch B installed on the end of the mechanical support rod and the support rod slot are obtained;

[0022] When the switch quantity is in the close state, the control alarm stops sending the alarm signal.

[0023] In a second aspect, the present invention provides a cab rollover safety control system, the system comprising:

[0024] A distance sensor installed on the cab lifting cylinder is used to obtain the extension length of the lifting cylinder;

[0025] The inclination sensor installed on the boom is used to obtain the inclination angle of the boom;

[0026] An alarm, used to send out an alarm signal;

[0027] The controller is connected to the distance sensor, the tilt sensor and the alarm respectively, and is used to execute the cab rollover safety control method as described in the first aspect, and control the alarm to issue an alarm prompt.

[0028] Furthermore, if the boom inclination angle is within the preset inclination angle range, the controller controls the lifting cylinder to continue to extend, and simultaneously obtains the time during which the extension length of the lifting cylinder is at a constant value;

[0029] When the time during which the extension length of the lifting cylinder remains constant is less than a preset value T, the lifting cylinder is controlled to continue extending until it reaches the final position.

[0030] Furthermore, the system further comprises:

[0031] The proximity switch includes a proximity switch part A and a proximity switch part B which are separately installed on the end of the mechanical support rod and the support rod slot;

[0032] When the switch is in the off state, the controller controls the alarm to send out an alarm signal;

[0033] When the switch quantity is in the close state, the controller controls the alarm to stop sending the alarm signal.

[0034] In a third aspect, the present invention provides an excavator, comprising the cab rollover safety control system as described in the second aspect.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] 1. The present invention can detect the state of the boom and warn of incorrect boom postures, thus avoiding safety accidents caused by interference with the boom;

[0037] 2. The present invention can monitor the cab flipping state by the time the lifting cylinder extension length remains constant, thus preventing false alarm triggering.

[0038] 3. The present invention can monitor the locking state of the support rod through the proximity switch and remind the maintenance personnel of the locking state to ensure the safety of the maintenance personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the structure of this application;

[0040] Figure 2 It is the system structure diagram of this application;

[0041] Figure 3 It is a flow chart of the method of this application.

[0042] In the figure: 1. Boom; 2. Tilt sensor; 3. Mechanical support rod; 4. Support rod slot; 5. Proximity switch part B; 6. Lifting cylinder; 7. Distance sensor; 8. Alarm; 9. Cab; 10. Proximity switch part A. DETAILED DESCRIPTION

[0043] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Example 1:

[0044] This embodiment provides a cab rollover safety control method, such as Figure 3 As shown, the method includes the following steps:

[0045] Obtain the extension length of the lifting cylinder 6;

[0046] Get the inclination angle of boom 1;

[0047] If the extension length of the lifting cylinder 6 is greater than the preset safety extension length, it is determined that the cab 9 is in a flipped state; the preset safety extension length is generally 10%-30% of the total extension length. This setting is to prevent the safety extension length from being set too low, resulting in frequent false triggering, and to prevent the safety length from being set too high, resulting in failure to generate an alarm and stop action.

[0048] When it is determined that the cab 9 is in a flipping state, it is determined whether the inclination angle of the boom 1 is within the preset inclination angle range. If the inclination angle of the boom 1 is not within the preset inclination angle range, the alarm 8 is controlled to issue an alarm prompt and the cab 9 is controlled to cancel the flipping.

[0049] The preset angle range is the appropriate angle range that allows the cab to flip, and the preset angle range of the boom of a specific model can be determined by on-site testing.

[0050] If the extension length of the lifting cylinder 6 is less than or equal to the preset safety extension length, the alarm device 8 is controlled to stop the alarm.

[0051] If the inclination angle of the boom 1 is within the preset inclination angle range, the lifting cylinder 6 is controlled to continue to extend, and the time during which the extension length of the lifting cylinder 6 is at a constant value is obtained;

[0052] When the time during which the extension length of the lifting cylinder 6 remains constant is less than the preset value T, the lifting cylinder 6 is controlled to continue extending until it reaches the final position.

[0053] When the time that the extension length of the lifting cylinder 6 remains constant is greater than a preset value T, the switching values ​​of the proximity switch A part 10 and the proximity switch B part 5 respectively installed on the end of the mechanical support rod 3 and the support rod slot 4 are obtained;

[0054] When the switch value is in the away state, the alarm device 8 is controlled to send out an alarm signal.

[0055] When the switch value is in the close state, the alarm device 8 is controlled to stop sending the alarm signal. Example 2:

[0056] This embodiment provides a cab rollover safety control system that intelligently distinguishes the rollover state of the cab 9 and issues a warning.

[0057] The entire system includes a cab 9, a boom 1, a tilt sensor 2, a controller, an alarm 8, a proximity switch A part 10, a proximity switch B part 5, a mechanical support rod 3, a support rod slot 4, a distance sensor 7, and a lifting cylinder 6.

[0058] The inclination sensor 2 is installed on the boom 1, and the distance sensor 7 is installed on the lifting cylinder 6; one side of the mechanical support rod 3 is fixed to the bottom of the cab 9, and the other side can move freely. The proximity switch A part 10 is installed on the movable side of the mechanical support rod 3, and the proximity switch B part 5 is installed in the support rod slot 4. When the mechanical support rod 3 is inserted into the support rod slot 4, the proximity switch A part 10 and the proximity switch B part 5 change from a distant state to a close state.

[0059] The specific control logic is as follows:

[0060] When the maintenance personnel operate the cab 9 to flip, the lifting cylinder 6 extends. At this time, the controller determines the extension length a of the lifting rod through the distance sensor 7. If a is greater than the set safe extension length b, it is determined that the cab 9 is in a flip state. At this time, the tilt sensor 2 transmits the state of the boom 1 (i.e., the tilt angle of the boom 1) to the controller, and the controller determines the posture of the boom 1. If the posture of the boom 1 does not meet the flipping requirements of the cab 9 at this time, the controller transmits a signal to the alarm 8 to issue an alarm prompt, and the cab 9 cancels the flip. When the extension length a is less than the safety value b, the alarm stops; when the posture of the boom 1 meets the flipping requirements, the lifting cylinder 6 continues to extend. When the extension length a is at T After it has been at a constant value for a certain period of time, it is determined that the cab 9 has been flipped over. At this time, the controller determines the state of the proximity switch. If the maintenance personnel inserts the mechanical support rod 3 into the support rod slot 4 at this time, the proximity switch A part 10 on the mechanical support rod 3 and the proximity switch B part 5 in the support rod slot 4 change from a distant state to a close state, and the switching value output by the proximity switch changes, no alarm is processed; if the maintenance personnel does not insert the mechanical support rod 3 into the support rod slot 4 at this time, and the switching value output by the proximity switch does not change, the controller transmits a signal to the alarm 8, and the alarm 8 gives an alarm prompt until the maintenance personnel inserts the mechanical support rod 3 into the support rod slot 4 and the alarm stops. Example 3:

[0061] This embodiment provides an excavator, including the cab rollover safety control system as described in the second embodiment.

[0062] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0063] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0064] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0065] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0066] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A cab rollover safety control method, characterized in that: The method comprises the following steps: Get the extension length of the lifting cylinder; Get the boom inclination angle; If the extension length of the lifting cylinder is greater than the preset safety extension length, it is determined that the cab is in a flip state; When it is determined that the cab is in a flipping state, it is determined whether the boom inclination angle is within a preset inclination angle range. If the boom inclination angle is not within the preset inclination angle range, the alarm is controlled to sound an alarm and the cab is controlled to cancel the flipping; The method further comprises: If the extension length of the lifting cylinder is less than or equal to the preset safety extension length, the alarm will stop sounding; The method further comprises: If the boom inclination angle is within the preset inclination angle range, the lifting cylinder is controlled to continue to extend, and the time during which the extension length of the lifting cylinder remains constant is obtained; When the time that the extension length of the lifting cylinder remains constant is less than a preset value T, the lifting cylinder is controlled to continue extending until it reaches the final position; The method further comprises: When the time that the extension length of the lifting cylinder remains constant is greater than a preset value T, the switching values ​​of the proximity switch A and the proximity switch B installed on the end of the mechanical support rod and the support rod slot are obtained; When the switch is in the off state, the control alarm sends out an alarm signal.

2. The cab rollover safety control method according to claim 1, characterized in that: The method further comprises: When the switch quantity is in the close state, the control alarm stops sending the alarm signal.

3. A cab rollover safety control system, characterized in that: The system comprises: A distance sensor installed on the cab lifting cylinder is used to obtain the extension length of the lifting cylinder; The inclination sensor installed on the boom is used to obtain the inclination angle of the boom; An alarm, used to send out an alarm signal; The controller is connected to the distance sensor, the tilt sensor and the alarm respectively, and is used to execute the cab rollover safety control method as claimed in claim 1 and control the alarm to issue an alarm prompt.

4. The cab rollover safety control system according to claim 3, characterized in that: If the boom inclination angle is within the preset inclination angle range, the controller controls the lifting cylinder to continue to extend, and at the same time obtains the time when the extension length of the lifting cylinder is at a constant value.

5. The cab rollover safety control system according to claim 4, characterized in that: The system further comprises: The proximity switch includes a proximity switch part A and a proximity switch part B which are separately installed on the end of the mechanical support rod and the support rod slot; When the switch is in the off state, the controller controls the alarm to send out an alarm signal; When the switch quantity is in the close state, the controller controls the alarm to stop sending the alarm signal.

6. An excavator, characterized in that: It comprises a cab rollover safety control system as described in any one of claims 3 to 5.

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