A control system and working method for preventing abnormal stretching and contraction of a track chassis

Abstract

The application discloses a control system for preventing abnormal stretching and retracting of a track chassis, comprising a controller, an extension proportional electromagnetic valve, a recovery proportional electromagnetic valve, an instrument, a distance sensor, a pressure sensor and a telescopic oil cylinder, wherein the output end of the controller is connected with the extension proportional electromagnetic valve and the recovery proportional electromagnetic valve, the controller is in communication connection with the instrument, the input end of the instrument is connected with the distance sensor and the pressure sensor respectively, the telescopic oil cylinder is installed on the main frame of the base and is used for controlling the stretching and retracting of the left longitudinal beam and the right longitudinal beam in the base, the distance sensor is used for detecting the distance between the main frame and the left longitudinal beam and the right longitudinal beam, the extension proportional electromagnetic valve is used for controlling the extension distance of the telescopic oil cylinder, and the recovery proportional electromagnetic valve is used for controlling the recovery distance of the telescopic oil cylinder. The application can automatically detect the change of the stretching and retracting of the track chassis, realize automatic distance correction and adjustment, prevent the automatic stretching and retracting of the track chassis caused by internal leakage, and improve the controllability, stability and safety of the whole machine operation.

Description

Technical Field

[0001] This invention relates to the field of engineering machinery, specifically to a control system and working method for preventing abnormal extension and retraction of tracked chassis. Background Technology

[0002] With the development of society, construction machinery, especially excavators, is becoming increasingly indispensable in engineering construction. In order to meet the construction conditions in confined spaces, the market demand for excavators with telescopic chassis is increasing. Whether the telescopic distance of the tracked chassis can maintain a fixed position for a long time directly affects the overall operability, stability and safety of the excavator.

[0003] However, during normal digging and walking operations, existing hydraulic excavators are subjected to uneven digging force and support reaction forces on both sides of the tracks, resulting in inconsistent pressure on both sides of the telescopic cylinder. Due to unavoidable internal leakage in the chassis telescopic cylinder and main valve core, the long-term impact and uneven force cause changes in the chassis telescopic distance. The automatic change in telescopic distance is not easily detected, which greatly affects the digging stability and walking safety of the machine during construction. Moreover, after the telescopic distance changes, existing technology cannot accurately return to the predetermined position by manually adjusting the telescopic distance. Summary of the Invention

[0004] To address the problems existing in the prior art, the present invention provides a control system and working method for preventing abnormal extension and retraction of a tracked chassis. The distance sensor determines the distance between the left and right longitudinal beams of the chassis. When the change in the left and right longitudinal beams exceeds the preset allowable change value, the instrument controls the hydraulic system to automatically adjust the chassis extension cylinders, ultimately achieving the reset of the left and right longitudinal beams of the chassis.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: a control system for preventing abnormal extension and retraction of a tracked chassis, comprising: a controller, an extension proportional solenoid valve, a retraction proportional solenoid valve, an instrument, a distance sensor, a pressure sensor, and a telescopic cylinder. The output end of the controller is connected to the extension proportional solenoid valve and the retraction proportional solenoid valve. The controller is communicatively connected to the instrument. The input end of the instrument is connected to the distance sensor and the pressure sensor, respectively. The telescopic cylinder is mounted on the main frame of the base and is used to control the extension and retraction of the left and right longitudinal beams in the base. The distance sensor is used to detect the distance between the main frame and the left and right longitudinal beams. The pressure sensor is used to detect the hydraulic pressure in the pilot oil circuit of the extension function of the chassis hydraulic system. The chassis hydraulic system is used to control the operation of the telescopic cylinder. The extension proportional solenoid valve is used to control the extension distance of the telescopic cylinder, and the retraction proportional solenoid valve is used to control the retraction distance of the telescopic cylinder.

[0006] Furthermore, the base includes: a main frame, a left longitudinal beam, a right longitudinal beam, track wheel seats, and tracks. The left and right longitudinal beams are symmetrically installed on both sides of the main frame. The left and right longitudinal beams are installed on the main frame through a telescopic structure. Multiple track wheel seats are installed on the left and right longitudinal beams, and the tracks are wound around the multiple track wheel seats.

[0007] A method for operating a control system to prevent abnormal extension and retraction of a tracked chassis, the specific method comprising: After the tracked chassis is powered on and ignited, the instrument panel defaults to the chassis telescopic protection mode, and the control program in the instrument panel begins to run. The pressure sensor first determines the hydraulic pilot pressure controlling the chassis extension and retraction. When the acquired pilot pressure reaches a preset value, it is determined to be a human operation, and the subsequent operation of the protection program is automatically stopped. When no pilot pressure is detected, sensors installed on the longitudinal beams collect the distance between the left and right longitudinal beams in real time and transmit it to the instrument. The distance data collected the first time is recorded as the initial predetermined position and stored in the instrument. Subsequent distance data collected is compared with the distance data at this initial position. When the distance change exceeds the set value (which can be manually set), the instrument issues an alarm, prompting the customer that the tracked chassis has automatically extended and retracted, and displays the changed data. At this time, the customer can... The system prompts the user to choose whether to reset. If "No" is selected, the program automatically repeats the operation for the next round. If "Yes" is selected, the instrument sends a command to the controller, which in turn outputs current to the proportional solenoid valve. If the change value is positive, it indicates that the cylinder has extended. The controller then activates the retraction proportional solenoid valve, driving the telescopic cylinder to retract. When the distance sensor detects that the distance between the left and right longitudinal beams has returned to the initial position, the controller stops the telescopic cylinder. If the change value is negative, it indicates that the cylinder has retracted. The controller then activates the extension proportional solenoid valve, driving the telescopic cylinder to extend. When the distance sensor detects that the distance between the left and right longitudinal beams has returned to the initial position, the controller stops the telescopic cylinder, thus achieving automatic chassis reset.

[0008] Furthermore, the preset value is 0.6-1.0 MPa.

[0009] Furthermore, the telescopic protection mode: This mode activates the automatic correction program for the tracked chassis telescopic distance.

[0010] The beneficial effects of this invention are: it can automatically detect changes in the extension and retraction of the tracked chassis and realize automatic distance correction and adjustment, preventing the tracked chassis from automatically extending and retracting due to internal leakage, thereby improving the overall machine's operability, stability and safety. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the base structure; Figure 3 This is a flowchart illustrating the workflow; In the diagram: 1. Main frame; 2. Left longitudinal beam; 3. Right longitudinal beam; 4. Track wheel seat; 5. Track; 6. Controller; 7. Extension proportional solenoid valve; 8. Retraction proportional solenoid valve; 9. Instrument; 10. Distance sensor; 11. Pressure sensor; 12. Telescopic cylinder. Implementation

[0012] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of the invention.

[0013] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention.

[0014] like Figure 1 As shown, a control system for preventing abnormal extension and retraction of a tracked chassis includes: a controller, an extension proportional solenoid valve, a retraction proportional solenoid valve, an instrument, a distance sensor, a pressure sensor, and a telescopic cylinder. The output of the controller is connected to the extension proportional solenoid valve and the retraction proportional solenoid valve. The controller is communicatively connected to the instrument, and the input of the instrument is connected to the distance sensor and the pressure sensor, respectively. The telescopic cylinder is mounted on the main frame of the base and is used to control the extension and retraction of the left and right longitudinal beams in the base. The distance sensor is mounted on the left and right longitudinal beams or on both sides of the main frame to detect the distance between the main frame and the left and right longitudinal beams. The pressure sensor is used to detect the hydraulic pressure in the pilot oil circuit of the extension function of the chassis hydraulic system to determine whether automatic extension and retraction has occurred. The chassis hydraulic system is used to control the operation of the telescopic cylinder. The extension proportional solenoid valve is used to control the extension distance of the telescopic cylinder, and the retraction proportional solenoid valve is used to control the retraction distance of the telescopic cylinder.

[0015] The extension proportional solenoid valve and the retraction proportional solenoid valve are installed in the chassis hydraulic system and connected to the telescopic cylinder to control the extension or retraction of the telescopic cylinder.

[0016] The controller, instruments, distance sensor, and pressure sensor are connected and communicate via the CAN bus protocol.

[0017] The instrument is a configurable instrument, which allows for easy setting of parameters.

[0018] like Figure 2As shown, the base includes: a main frame, a left longitudinal beam, a right longitudinal beam, track wheel seats, and tracks. The left and right longitudinal beams are symmetrically installed on both sides of the main frame. The left and right longitudinal beams are installed on the main frame through a telescopic structure. Multiple track wheel seats are installed on the left and right longitudinal beams, and the tracks are wound around the multiple track wheel seats.

[0019] This device can be used on engineering machinery with telescopic chassis, such as excavators, loaders, and cranes.

[0020] like Figure 3 As shown, a method for controlling a tracked chassis to prevent abnormal extension and retraction is described, the specific method including: After the tracked chassis is powered on and ignited, the instrument panel defaults to the chassis telescopic protection mode, and the control program in the instrument panel begins to run. The pressure sensor first determines the hydraulic pilot pressure controlling the chassis extension and retraction. When the acquired pilot pressure reaches a preset value, it is determined to be a human operation, and the subsequent operation of the protection program is automatically stopped. When no pilot pressure is detected, sensors installed on the longitudinal beams collect the distance between the left and right longitudinal beams in real time and transmit it to the instrument. The distance data collected the first time is recorded as the initial predetermined position and stored in the instrument. Subsequent distance data collected is compared with the distance data at this initial position. When the distance change exceeds the set value (which can be manually set), the instrument issues an alarm, prompting the customer that the tracked chassis has automatically extended and retracted, and displays the changed data. At this time, the customer can... The system prompts the user to choose whether to reset. If "No" is selected, the program automatically repeats the operation for the next round. If "Yes" is selected, the instrument sends a command to the controller, which in turn outputs current to the proportional solenoid valve. If the change value is positive, it indicates that the cylinder has extended. The controller then activates the retraction proportional solenoid valve, driving the telescopic cylinder to retract. When the distance sensor detects that the distance between the left and right longitudinal beams has returned to the initial position, the controller stops the telescopic cylinder. If the change value is negative, it indicates that the cylinder has retracted. The controller then activates the extension proportional solenoid valve, driving the telescopic cylinder to extend. When the distance sensor detects that the distance between the left and right longitudinal beams has returned to the initial position, the controller stops the telescopic cylinder, thus achieving automatic chassis reset.

[0021] The preset value is generally set between 0.6 and 1.0 MPa, and is usually set at 0.8 MPa.

[0022] Telescopic Protection Mode: In this mode, the automatic correction program for the telescopic distance of the tracked chassis is activated, which restores it to the preset value.

[0023] This system and method can automatically detect changes in the extension and retraction of the tracked chassis and automatically correct and adjust the distance, preventing the tracked chassis from automatically extending and retracting due to internal leakage, thereby improving the overall machine's operability, stability, and safety.

[0024] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A control system for preventing abnormal extension and retraction of a tracked chassis, characterized in that, include: The system includes a controller, an extension proportional solenoid valve, a retraction proportional solenoid valve, an instrument, a distance sensor, a pressure sensor, and a telescopic cylinder. The output of the controller is connected to the extension proportional solenoid valve and the retraction proportional solenoid valve. The controller is also connected to the instrument. The input of the instrument is connected to the distance sensor and the pressure sensor, respectively. The telescopic cylinder is mounted on the main frame of the base and is used to control the extension and retraction of the left and right longitudinal beams in the base. The distance sensor is used to detect the distance between the main frame and the left and right longitudinal beams. The pressure sensor is used to detect the hydraulic pressure in the pilot oil circuit of the extension function of the chassis hydraulic system. The chassis hydraulic system is used to control the operation of the telescopic cylinder. The extension proportional solenoid valve is used to control the extension distance of the telescopic cylinder, and the retraction proportional solenoid valve is used to control the retraction distance of the telescopic cylinder. The system's operating method includes: After power-on and ignition, the instrument panel defaults to the chassis telescopic protection mode, and the control program in the instrument panel begins to run. The pressure sensor first determines the hydraulic pilot pressure controlling the chassis extension and retraction. When the acquired pilot pressure reaches a preset value, it is determined to be a manual operation, and the control program automatically stops. When no pilot pressure is detected, distance sensors installed on the longitudinal beams collect the distance between the left and right longitudinal beams in real time and transmit it to the instrument. The first collected distance data is recorded as the initial position and stored in the instrument. Subsequent collected distances are compared with the distance data at this initial position. When the distance change exceeds the set value, the instrument issues an alarm, prompting the customer that the tracked chassis has automatically extended and retracted, and displays the changed data. At this time, the customer can take appropriate action based on the alarm prompt. The option to reset is as follows: when "No" is selected, the program automatically repeats the operation for the next round; when "Yes" is selected, the instrument sends a command to the controller, which outputs current to the proportional solenoid valve. If the change value is positive, it is determined that the cylinder has extended, and the controller activates the retraction proportional solenoid valve to drive the telescopic cylinder to retract. When the distance sensor detects that the distance between the left and right longitudinal beams has returned to the initial position, the controller stops the telescopic cylinder. If the change value is negative, it is determined that the cylinder has retracted, and the controller activates the extension proportional solenoid valve to drive the telescopic cylinder to extend. When the distance sensor detects that the distance between the left and right longitudinal beams has returned to the initial position, the controller stops the telescopic cylinder, thus achieving the purpose of automatic chassis reset.

2. The control system for preventing abnormal extension and retraction of a tracked chassis according to claim 1, characterized in that: The base includes: a main frame, a left longitudinal beam, a right longitudinal beam, track wheel seats, and tracks. The left and right longitudinal beams are symmetrically installed on both sides of the main frame. The left and right longitudinal beams are installed on the main frame through a telescopic structure. Multiple track wheel seats are installed on the left and right longitudinal beams, and the tracks are wound around the multiple track wheel seats.

3. The control system for preventing abnormal extension and retraction of a tracked chassis according to claim 1, characterized in that: The preset value is 0.6-1.0 MPa.

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