A hydraulic system of a cotton picking head, a control method and system of the cotton picking head

Abstract

The application discloses a kind of cotton picking head hydraulic systems, the control method and system of cotton picking head, belong to cotton picking machine technical field, by first pressure detection device acquisition cotton picking head hydraulic system hydraulic pump export system pressure, and the system pressure is sent to controller, controller when system pressure is greater than first preset pressure and less than second preset pressure, output system pressure alarm prompt, and control the displacement of hydraulic pump reduces, to make the speed of cotton picking head hydraulic system hydraulic motor reduces;When system pressure is greater than or equal to second preset pressure, output system pressure alarm prompt, and control the displacement of hydraulic pump reduces to zero, to make hydraulic motor stop.Using the cotton picking head hydraulic system, the control method and system of cotton picking head, can make a timely response when cotton picking head pressure abnormal condition, and according to the size of pressure uses different control strategy, further guarantees the reliability of cotton picking head operation.

Description

Technical Field

[0001] This invention relates to the field of cotton harvester technology, and more specifically, to a cotton harvester head hydraulic system, a cotton harvester head control method and system. Background Technology

[0002] Cotton harvesters are essential cotton picking and harvesting machinery for large cotton fields. They can not only solve the problem of severe labor shortage during the cotton harvest season, but also save labor costs and greatly improve cotton picking efficiency.

[0003] However, cotton harvesting machines encounter many uncontrollable risks during the cotton harvesting process, such as uneven cotton planting leading to untimely cotton delivery and subsequent blockage of the harvesting head; the harvesting head sucking in stones or other foreign objects that damage the picking spindle; and improper speed control causing cotton to accumulate and blockage at the harvesting head. Common cotton harvesters cannot cope with these different working conditions.

[0004] In conclusion, how to effectively solve the problem of cotton harvesting heads failing to operate reliably under different working conditions is a problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a cotton picking head hydraulic system, a cotton picking head control method and system, so as to effectively solve the problem that cotton picking heads are difficult to operate reliably under different working conditions.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A method for controlling cotton picking heads includes:

[0008] Collect the system pressure at the outlet of the hydraulic pump in the cotton picking head hydraulic system;

[0009] When the system pressure is greater than the first preset pressure and less than the second preset pressure, a system pressure alarm is output, and the displacement of the hydraulic pump is reduced to reduce the speed of the hydraulic motor of the cotton picking head hydraulic system.

[0010] When the system pressure is greater than or equal to the second preset pressure, a system pressure alarm is output, and the displacement of the hydraulic pump is reduced to zero so that the hydraulic motor stops.

[0011] The second preset pressure is greater than the first preset pressure.

[0012] Optionally, in the above-described method for controlling the cotton picking head, after controlling the displacement of the hydraulic pump to reduce to zero so that the hydraulic motor stops, the method further includes:

[0013] When the system pressure is greater than the second preset pressure and the hydraulic motor does not stop, a system pressure alarm is output, and the pressure shut-off valve connected between the hydraulic pump and the hydraulic motor maintains the system pressure at the second preset pressure.

[0014] Optionally, the above-mentioned method for controlling the cotton picking head also includes:

[0015] When the system pressure is greater than or equal to the third preset pressure, a system pressure alarm is output, and the safety relief valve connected to the hydraulic pump outlet is opened to release pressure, wherein the third preset pressure is greater than the second preset pressure.

[0016] Optionally, the above-mentioned method for controlling the cotton picking head also includes:

[0017] Collect the replenishment pressure at the outlet of the replenishment pump of the cotton picking head hydraulic system;

[0018] When the replenishment pressure exceeds the fourth preset pressure, an oil replenishment pressure alarm will be output.

[0019] Optionally, the above-mentioned method for controlling the cotton picking head also includes:

[0020] The rotational speed of the reduction gearbox connected to the cotton picking head is collected;

[0021] When the rotational speed is lower than the preset speed, the displacement of the hydraulic pump is increased to increase the rotational speed of the hydraulic motor.

[0022] Optionally, the above-mentioned method for controlling the cotton picking head also includes:

[0023] Check if the clutch of the cotton picking head is slipping;

[0024] When the clutch slips, a slippage alarm is output.

[0025] The control method for the cotton picking head provided by this invention addresses the issue of increased load on the head due to a decrease in rotational speed or shutdown caused by foreign object blockage. This leads to a significant increase in the output torque of the gearbox and hydraulic motor, resulting in a substantial increase in hydraulic system pressure. Therefore, by monitoring the system pressure at the outlet of the hydraulic pump in the cotton picking head hydraulic system, an alarm is triggered when the system pressure exceeds a first preset pressure but is less than a second preset pressure. The system pump's displacement is reduced to decrease the rotational speed of the hydraulic motor. Conversely, when the system pressure is greater than or equal to the second preset pressure, another alarm is triggered, and the hydraulic pump's displacement is reduced to zero to stop the hydraulic motor. The second preset pressure is greater than the first preset pressure. This control method allows for timely responses to abnormal pressure conditions in the cotton picking head and employs different control strategies based on pressure levels, further ensuring the reliability of the cotton picking head's operation.

[0026] This invention also provides the following technical solutions:

[0027] A control system for a cotton picking head includes:

[0028] The first pressure detection device is used to collect the system pressure at the outlet of the hydraulic pump of the cotton picking head hydraulic system.

[0029] The controller, electrically connected to the first pressure detection device, is used to output a system pressure alarm when the system pressure is greater than a first preset pressure and less than a second preset pressure, and to control the displacement of the hydraulic pump to decrease so as to reduce the speed of the hydraulic motor of the cotton picking head hydraulic system; when the system pressure is greater than or equal to the second preset pressure, it outputs a system pressure alarm and controls the displacement of the hydraulic pump to be reduced to zero so as to stop the hydraulic motor.

[0030] The second preset pressure is greater than the first preset pressure.

[0031] Optionally, the control system for the cotton picking head mentioned above also includes:

[0032] The second pressure detection device is used to collect the replenishment pressure at the outlet of the replenishment pump of the cotton picking head hydraulic system;

[0033] The controller is also used to output an oil replenishment pressure alarm when the oil replenishment pressure is greater than a fourth preset pressure.

[0034] The control system for the cotton picking head provided by this invention addresses the issue of increased load on the head due to a decrease in rotational speed or shutdown caused by foreign object blockage. This leads to a significant increase in the output torque of the gearbox and hydraulic motor, resulting in a substantial increase in hydraulic system pressure. Therefore, a first pressure detection device collects the system pressure at the outlet of the hydraulic pump in the cotton picking head's hydraulic system and sends this pressure to the controller. When the system pressure is greater than a first preset pressure but less than a second preset pressure, the controller outputs a system pressure alarm and reduces the hydraulic pump's displacement to lower the rotational speed of the hydraulic motor. When the system pressure is greater than or equal to the second preset pressure, the controller outputs another system pressure alarm and reduces the hydraulic pump's displacement to zero, stopping the hydraulic motor. The second preset pressure is greater than the first preset pressure. This control system can react promptly to abnormal pressure conditions in the cotton picking head and employs different control strategies based on the pressure magnitude, further ensuring the reliability of the cotton picking head's operation.

[0035] This invention also provides the following technical solutions:

[0036] A cotton picking head hydraulic system includes an oil tank, a hydraulic pump, a hydraulic motor, a displacement control proportional valve, and a replenishing pump. The oil inlet of the hydraulic pump is connected to the oil tank. The hydraulic motor drives the cotton picking head to rotate and is connected to the oil outlet of the hydraulic pump. The displacement control proportional valve is connected between the hydraulic pump and the hydraulic motor. The oil inlet of the replenishing pump is connected to the oil tank, and its outlet is connected to the hydraulic motor. The system further includes a first pressure detection device, a pressure shut-off valve, and a safety relief valve. The first pressure detection device is connected to the oil outlet of the hydraulic pump. The safety relief valve is connected between the first end of the hydraulic motor and the oil outlet of the replenishing pump, and between the second end of the hydraulic motor and the oil outlet of the replenishing pump. The pressure shut-off valve is connected between the first end of the hydraulic motor and the hydraulic pump, and between the second end of the hydraulic motor and the hydraulic pump.

[0037] Optionally, the above-mentioned cotton picking head hydraulic system further includes a second pressure detection device, which is connected to the oil outlet of the replenishing pump.

[0038] The cotton-picking head hydraulic system provided by this invention addresses the issue of reduced speed or stoppage of the cotton-picking head due to foreign object blockage, resulting in a significant increase in the load on the cotton-picking head. This leads to a substantial increase in the output torque of the gearbox and hydraulic motor, causing a significant increase in hydraulic system pressure. Therefore, by collecting the system pressure at the outlet of the hydraulic pump in the cotton-picking head hydraulic system using a first pressure detection device, appropriate measures can be taken based on this system pressure, such as output system pressure alarm prompts, reducing the hydraulic pump's displacement, or reducing the hydraulic pump's displacement to zero. Furthermore, the pressure cut-off valve automatically cuts off the pressure when the hydraulic system pressure reaches its corresponding operating pressure, maintaining the hydraulic system pressure at the corresponding operating pressure and preventing pressure damage to the hydraulic system. Finally, the safety relief valve opens to release pressure if the hydraulic system pressure continues to rise after the pressure cut-off valve activates, reaching the relief pressure of the safety relief valve. In summary, the use of this cotton harvester hydraulic system enables real-time monitoring of system pressure, allowing for timely responses to abnormal pressure conditions. Furthermore, the installation of pressure shut-off valves and safety relief valves further ensures the reliability of the cotton harvester's operation. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 This is a schematic diagram of the structure of a cotton-picking head hydraulic system according to a specific embodiment of the present invention;

[0041] Figure 2 This is a flowchart illustrating a specific embodiment of the cotton picking head control method of the present invention;

[0042] Figure 3 This is a pressure monitoring and protection control logic diagram;

[0043] Figure 4 This is the logic diagram for adjusting the rotation speed of the cotton picking head;

[0044] Figure 5 Here is the clutch monitoring and protection control logic diagram;

[0045] Figure 6 This is a schematic diagram of the control system of a cotton picking head according to a specific embodiment of the present invention.

[0046] The following labels are shown in the attached diagram:

[0047] 1. Hydraulic pump; 2. Hydraulic motor; 3. Pressure shut-off valve; 4. Safety relief valve; 5. Oil replenishment relief valve; 6. Oil replenishment filter; 7. Second pressure detection device; 8. First pressure detection device; 9. Oil replenishment pump; 10. Suction filter; 11. Oil tank; 12. Displacement control proportional valve;

[0048] 100. Controller; 200. First pressure detection device; 300. Second pressure detection device; 400. Speed ​​detection device; 500. Clutch slippage detection device. Detailed Implementation

[0049] This invention discloses a cotton picking head hydraulic system, a cotton picking head control method and system, to improve the reliability of the cotton picking head under different working conditions.

[0050] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0051] The cotton harvesting process involves numerous uncontrollable risks to the cotton harvester head. To promptly identify problems and ensure continuous and efficient harvesting operations, and to prevent damage to the entire cotton harvester head system from uncertainties, it is necessary to install pressure protection for the hydraulic system of the cotton harvester head. However, most existing pressure protection devices offer only single-mode control and are unsuitable for the complex operating conditions of the cotton harvester head. Therefore, this application provides a cotton harvester head hydraulic system capable of meeting the requirements of various operating modes for the hydraulic control of the cotton harvester head.

[0052] In one embodiment, see Figure 1 The cotton picking head hydraulic system provided by the present invention includes an oil tank 11, a hydraulic pump 1, a hydraulic motor 2, a displacement control proportional valve 12, a replenishing oil pump 9, a first pressure detection device 8, a pressure shut-off valve 3, and a safety relief valve 4.

[0053] The hydraulic pump 1 has its inlet connected to the oil tank 11. The function of the hydraulic pump 1 is to provide the required flow rate of hydraulic oil to the entire cotton-picking head driven hydraulic closed-loop system. The hydraulic motor 2 drives the cotton-picking head to rotate; specifically, the hydraulic motor 2 is connected to the cotton-picking head, which can be connected via a reduction gearbox, thereby driving the cotton-picking head's picking drum to rotate. The hydraulic motor 2 is connected to the outlet of the hydraulic pump 1, so the hydraulic pump 1 pumps hydraulic oil to the hydraulic motor 2. The displacement control proportional valve 12 is connected between the hydraulic pump 1 and the hydraulic motor 2 to adjust the displacement of the hydraulic pump 1. The inlet of the replenishing pump 9 is connected to the oil tank 11, and its outlet is connected to the hydraulic motor 2. The replenishing pump 9's function is to flush, change the oil, and cool the entire closed-loop system. The specific structure of the cotton-picking head driven hydraulic closed-loop system can be found in existing technology and will not be elaborated here.

[0054] In this application, a first pressure detection device 8, a pressure shut-off valve 3, and a safety relief valve 4 are added to the closed-loop hydraulic system driven by the cotton picking head. The first pressure detection device 8 is connected to the oil outlet of the hydraulic pump 1 and is used to detect the system pressure. The corresponding control system, based on the system pressure detected by the first pressure detection device 8, controls the current of the proportional valve 12 by controlling the displacement, thereby controlling the displacement of the hydraulic pump 1 and adjusting the speed of the hydraulic motor 2. Pressure shut-off valves 3 are connected between the first end of the hydraulic motor 2 and the hydraulic pump 1, and between the second end of the hydraulic motor 2 and the hydraulic pump 1, respectively. With the pressure shut-off valve 3, when the hydraulic system pressure reaches the corresponding operating pressure of the pressure shut-off valve 3, i.e., if the hydraulic pump 1's displacement is reduced to zero by electrical control to stop the hydraulic motor, and the system pressure is still rising, it indicates a fault in the hydraulic pump 1 or an electrical fault in the control system, causing the hydraulic pump 1 to fail to reduce its displacement normally. In this case, because of the pressure shut-off valve 3, it can automatically cut off the pressure after the hydraulic system pressure exceeds the limit, maintaining the hydraulic system pressure at the corresponding operating pressure and preventing pressure damage to the hydraulic system.

[0055] Safety relief valves 4 are connected between the first end of the hydraulic motor 2 and the outlet of the replenishing pump 9, and between the second end of the hydraulic motor 2 and the outlet of the replenishing pump 9, respectively. Safety relief valves 4 are used for overflow when the hydraulic motor 2 rotates in both directions. The overflowing oil enters the system via the replenishing pump 9, while excess oil can flow back to the oil tank 11 via the overflow valve in the replenishing circuit. As configured above, even in the event of abnormal pressure control by the first pressure detection device 8, pressure shut-off valve 3, etc., safety relief valve 4 can still provide safety overflow. That is, when the system pressure reaches the working pressure of safety relief valve 4, safety relief valve 4 activates to release pressure, thereby protecting the hydraulic system. If the hydraulic system pressure continues to rise after the pressure shut-off valve 3 activates, the pressure shut-off valve 3 is faulty. In this case, the hydraulic system pressure continues to rise, and when the hydraulic system pressure reaches the overflow pressure of safety relief valve 4, safety relief valve 4 opens to release pressure.

[0056] In one embodiment, the cotton picking head hydraulic system further includes a replenishing overflow valve 5 and a replenishing filter 6. The replenishing overflow valve 5 is used for pressure regulation of the replenishing oil circuit, and the replenishing filter 6 is used to filter impurities in the replenishing oil circuit to prevent system contamination. The specific connection relationships of the above components are as follows: Figure 1 As shown, the structural configuration of a conventional hydraulic closed-loop system driven by a cotton picking head can also be referenced in the prior art as needed.

[0057] Furthermore, the cotton harvesting head hydraulic system also includes a second pressure detection device 7, which is connected to the outlet of the replenishing pump 9 and is used to detect the replenishing pressure of the replenishing circuit. When the replenishing pressure is abnormal, the control system will issue an alarm accordingly. The first pressure detection device 8 and the second pressure detection device 7 can specifically be pressure sensors, or pressure gauges and other pressure detection equipment as needed.

[0058] The hydraulic pump 1 mentioned above can be either a swashplate pump or a conventional variable vane pump.

[0059] Please see Figure 1 When the cotton harvester is started, press the cotton harvesting head engagement button and slowly push the handle forward (the handle is used to adjust the current at port C1 of the displacement control proportional valve 12; for its connection relationship and working principle, please refer to existing technology). The current at port C1 of the displacement control proportional valve 12 of the hydraulic pump 1 gradually increases, and the hydraulic oil output flow of the hydraulic pump 1 increases accordingly. The oil flows through port A of the hydraulic pump 1 to port A of the hydraulic motor 2 of the cotton harvesting head, and then flows back from port B of the hydraulic motor 2 of the cotton harvesting head to port B of the hydraulic pump 1, forming a closed-loop hydraulic drive system. Simultaneously, the replenishing pump 9 draws oil from the oil tank 11. During oil drawing, the oil passes through the suction filter 10, and the pressure oil output by the replenishing pump 9 passes through the replenishing filter 6, replenishing the hydraulic oil into the entire closed-loop system, serving as an oil change, flushing, and cooling mechanism. The rotation of the hydraulic motor 2 drives the cotton harvesting head reduction gearbox, which in turn drives the bevel gearbox, gear disc, clutch, and spindle roller inside the cotton harvesting head, forming a complete cotton harvesting head operation drive circuit. In cotton harvesting mode, press the cotton harvesting head engagement button and slowly push the handle forward. The operating speed of the cotton harvesting head and the traveling speed of the cotton harvester will automatically match the speed ratio, increasing the cotton harvesting efficiency.

[0060] The cotton-picking head hydraulic system provided by this invention addresses the issue of increased load on the cotton-picking head due to a decrease in rotational speed or shutdown caused by foreign object blockage. This leads to a significant increase in the output torque of the gearbox and hydraulic motor 2, resulting in a substantial increase in hydraulic system pressure. Therefore, the first pressure detection device 8 collects the system pressure at the outlet of the hydraulic pump 1 and, based on this pressure, takes appropriate actions such as issuing an output system pressure alarm, reducing the displacement of the hydraulic pump 1, or reducing the displacement of the hydraulic pump 1 to zero. Furthermore, the inclusion of a pressure shut-off valve 3 and a safety relief valve 4 enhances the safety of the pressure system. In summary, this cotton-picking head hydraulic system enables real-time monitoring of system pressure, allowing for timely responses to abnormal pressure conditions and further ensuring the reliability of the cotton-picking head operation.

[0061] This invention also provides a control method for a cotton picking head, which can be used in the aforementioned cotton picking head hydraulic system. Please refer to [link to relevant documentation]. Figure 2 In one specific embodiment, the method for controlling the cotton picking head includes the following steps:

[0062] S1: Collects the system pressure at the outlet of the hydraulic pump in the cotton picking head hydraulic system;

[0063] S2: When the system pressure is greater than the first preset pressure and less than the second preset pressure, output a system pressure alarm prompt and control the hydraulic pump to reduce the displacement so as to reduce the speed of the hydraulic motor of the cotton picking head hydraulic system.

[0064] S3: When the system pressure is greater than or equal to the second preset pressure, output a system pressure alarm prompt and control the hydraulic pump displacement to be reduced to zero so that the hydraulic motor stops;

[0065] The second preset pressure is greater than the first preset pressure.

[0066] By collecting the system pressure at the hydraulic pump outlet and comparing it with the first and second preset pressures, a system pressure alarm is issued when the system pressure is greater than the first preset pressure but less than the second preset pressure. This triggers a reduction in the hydraulic pump's displacement, thereby decreasing the speed of the hydraulic motor in the cotton picking head hydraulic system. When the system pressure is greater than or equal to the second preset pressure, a system pressure alarm is issued again, and the hydraulic pump's displacement is reduced to zero, causing the hydraulic motor to stop.

[0067] The control method for the cotton picking head provided by this invention addresses the issue of increased load on the head due to a decrease in rotational speed or shutdown caused by foreign object blockage. This leads to a significant increase in the output torque of the gearbox and hydraulic motor, resulting in a substantial increase in hydraulic system pressure. Therefore, by monitoring the system pressure at the outlet of the hydraulic pump in the cotton picking head hydraulic system, an alarm is triggered when the system pressure exceeds a first preset pressure but falls below a second preset pressure. The system also reduces the pump's displacement to decrease the rotational speed of the hydraulic motor. Conversely, when the system pressure is greater than or equal to the second preset pressure, another alarm is triggered, and the pump's displacement is reduced to zero to stop the hydraulic motor. This control method enables timely responses to abnormal pressure conditions in the cotton picking head and employs different control strategies based on pressure levels, further ensuring the reliability of the cotton picking head's operation.

[0068] The cotton harvesting head control method is equipped with multiple protection modes. In abnormal operating conditions such as the cotton harvesting head being blocked by foreign objects or sucking in gravel, these protection modes will immediately activate to prevent the cotton harvesting head from being damaged by obstruction. For example... Figure 3 As shown, Figure 3 This is a pressure monitoring and protection control logic diagram. Specifically, when the cotton picking head is blocked by foreign objects, its rotation speed decreases or it stops, resulting in a significant increase in the load on the cotton picking head. This leads to a substantial increase in the output torque of the gearbox and the cotton picking head motor. The increased load causes a significant increase in the hydraulic system pressure. This pressure is transmitted to the controller through the first pressure detection device at the hydraulic pump outlet. The controller's program logic determines whether the system pressure exceeds the first preset pressure (e.g., 300 bar). When the system pressure exceeds the first preset pressure but is less than the second preset pressure (e.g., 350 bar), while displaying the pressure value and triggering the alarm, the controller simultaneously controls the output current at port C1 of the hydraulic pump's displacement control proportional valve to adjust the hydraulic motor and cotton picking head for deceleration. When the pressure value detected by the first pressure detection device is greater than or equal to the second preset pressure, the controller controls the output current at port C1 of the hydraulic pump until the hydraulic pump's output displacement is zero, causing the cotton picking head to stop rotating. This completes one cycle of pressure control at the cotton picking head to initiate the pressure monitoring and protection control mode for abnormal operating conditions such as cotton picking head stall.

[0069] The aforementioned system pressure alarm prompts include alarms displayed on a screen, and may also include buzzer alarms or voice alarms as needed.

[0070] In one embodiment, after step S3, the method further includes:

[0071] S4: When the system pressure is greater than the second preset pressure and the hydraulic motor does not stop, output a system pressure alarm prompt, and the pressure cut-off valve connected between the hydraulic pump and the hydraulic motor maintains the system pressure at the second preset pressure.

[0072] When the system pressure exceeds the second preset pressure, the hydraulic pump's displacement will be reduced to zero to stop the hydraulic motor. Therefore, if a system pressure increase is still detected when the system pressure exceeds the second preset pressure, it indicates that the hydraulic motor has not stopped, suggesting a hydraulic pump malfunction or an electrical fault in the control system. In this case, the pressure shut-off valve 3 can automatically cut off the pressure after the hydraulic system pressure exceeds the limit, maintaining the hydraulic system pressure at the corresponding operating pressure to prevent pressure damage to the hydraulic system.

[0073] In one embodiment, after step S4, the method further includes:

[0074] S5: When the system pressure is greater than or equal to the third preset pressure, output a system pressure alarm prompt, and open the safety relief valve connected to the hydraulic pump outlet to release pressure, wherein the third preset pressure is greater than the second preset pressure.

[0075] After the pressure shut-off valve actuates, it will cut off the system pressure, maintaining it at the valve's operating pressure. If the system pressure is detected to be still rising and exceeds the third preset pressure, it indicates a malfunction of the pressure shut-off valve. The safety relief valve will then open to release pressure, further enhancing the safety of the pressure system.

[0076] In one embodiment, the method for controlling the cotton picking head further includes:

[0077] Collect the replenishment pressure at the outlet of the replenishment pump of the cotton picking head hydraulic system;

[0078] When the replenishment pressure exceeds the fourth preset pressure, an oil replenishment pressure alarm will be output.

[0079] By detecting the replenishing oil pressure at the outlet of the replenishing oil pump, when the replenishing oil pressure exceeds the fourth preset pressure, a corresponding replenishing oil pressure alarm is output to facilitate relevant personnel to take rapid measures, thereby further improving the safety of the cotton picking head.

[0080] Specifically, the oil replenishment pressure alarm includes an alarm displayed on the screen. Depending on the needs, it may also include a buzzer alarm or a voice alarm.

[0081] In one embodiment, the method for controlling the cotton picking head further includes:

[0082] The rotational speed of the gearbox connected to the cotton picking head is recorded;

[0083] When the rotational speed is lower than the preset speed, the displacement of the hydraulic pump is increased to increase the rotational speed of the hydraulic motor.

[0084] Please see Figure 4 , Figure 4This is a logic diagram for the cotton picking head speed regulation control. It represents another protection mode in case of cotton picking head malfunction. A hydraulic pump drives a hydraulic motor, which in turn rotates the gearbox and the cotton picking head. A speed sensor inside the gearbox collects the gearbox's speed. In this mode, when a foreign object obstructs the cotton picking head, causing it to slow down, the speed of the gearbox decreases. This speed is transmitted to the controller via the speed sensor inside the gearbox. The controller performs a program logic judgment. If the speed reported by the speed sensor is lower than the preset speed (the normal speed range of the cotton picking head set in the program), it is determined that the cotton picking head is faulty. The controller adjusts the displacement of the hydraulic pump to control the current at the port of proportional valve C1, increasing the output flow of hydraulic pump 1 and thus increasing the speed of the gearbox. This prevents the cotton picking head from being damaged by foreign objects, completing the activation of the cotton picking head speed regulation control mode under abnormal conditions such as cotton picking head stall. Through this control, the safety of cotton picking head operation is further improved.

[0085] In one embodiment, the method for controlling the cotton picking head further includes:

[0086] Check if the clutch of the cotton picking head is slipping;

[0087] When clutch slippage occurs, an output slippage alarm will be triggered.

[0088] Please see Figure 5 , Figure 5 This is the clutch monitoring and protection control logic diagram. A hydraulic pump drives a hydraulic motor to rotate the reduction gearbox and the cotton picking head together. A clutch slippage sensor can be installed inside the cotton picking head at the clutch. In this mode, when a foreign object obstructs the cotton picking head, causing it to slow down, the clutch begins to slip. The clutch slippage sensor feeds the slippage signal back to the controller, which performs program logic judgment and outputs a slippage alarm. The slippage alarm specifically includes a display alarm and / or a buzzer alarm. For example, if the clutch slippage signal is displayed on the screen and a buzzer alarm is sounded, when the operator hears the alarm signal, the corresponding cotton picking head will be stopped, completing the activation of the clutch monitoring and protection control mode and initiating the mechanical protection mode.

[0089] The above mainly explains the different protection modes of the cotton harvesting head. The pressure and speed control process of the cotton harvesting head hydraulic system is as follows: After the cotton harvester is started, the hydraulic pump starts with zero displacement. When the cotton harvesting head engagement button is pressed and the handle is slowly pushed forward, the current at port C1 of the hydraulic pump displacement control proportional valve gradually increases, causing the hydraulic oil flow at outlet A of hydraulic pump 1 to gradually increase (in the case of a swashplate pump, the flow rate is adjusted by adjusting the angle of the swashplate). The flow rate into port A of the hydraulic motor also increases, and the speed of the hydraulic motor increases accordingly. The speed of the reduction gearbox of the cotton harvesting head driven by the hydraulic motor, as well as the bevel gearbox, gear disc, clutch, and spindle roller inside the cotton harvesting head, also increases. By controlling the input current at port C1 of the displacement control proportional valve through the controller, the output speed of the cotton harvesting head can be controlled to three levels: low speed, medium speed, and high speed, to meet the needs of various actual cotton harvesting conditions and complete one working operation of the cotton harvesting head from stop to low speed, medium speed, and high speed.

[0090] In cotton harvesting mode, the operating speed of the cotton harvesting head and the travel speed of the cotton harvester form an automatically matched speed ratio relationship. During the harvesting process, when the handle is pushed forward or pulled back, the controller receives the signal and issues a control command. The proportional current of the travel pump and travel motor gradually increases or decreases. During this period, the displacement of the travel pump is adjusted first to achieve travel acceleration or deceleration. The travel motor speed sensor monitors the speed in real time and feeds it back to the controller. After the controller judges, it issues a command to match the corresponding current to adjust the travel pump and travel motor to achieve closed-loop regulation of the travel speed. At the same time, the controller judges and issues a command to match the corresponding current to control the hydraulic pump to achieve acceleration or deceleration of the cotton harvesting head speed.

[0091] The present invention also provides a control system for a cotton picking head, adapted to the aforementioned hydraulic system for a cotton picking head. In one specific embodiment, please refer to... Figure 6 ,include:

[0092] The first pressure detection device 200 is used to collect the system pressure at the outlet of the hydraulic pump of the cotton picking head hydraulic system.

[0093] The controller 100 is electrically connected to the first pressure detection device 200. When the system pressure is greater than the first preset pressure and less than the second preset pressure, it outputs a system pressure alarm and controls the hydraulic pump to reduce the displacement so as to reduce the speed of the hydraulic motor in the cotton picking head hydraulic system. When the system pressure is greater than or equal to the second preset pressure, it outputs a system pressure alarm and controls the hydraulic pump to reduce the displacement to zero so as to stop the hydraulic motor.

[0094] The second preset pressure is greater than the first preset pressure.

[0095] The control system for the cotton picking head provided by this invention addresses the issue of increased load on the head due to a decrease in rotational speed or shutdown caused by foreign object blockage. This leads to a significant increase in the output torque of the gearbox and hydraulic motor, resulting in a substantial increase in hydraulic system pressure. Therefore, the first pressure detection device 200 collects the system pressure at the outlet of the hydraulic pump in the cotton picking head hydraulic system and sends this pressure to the controller 100. When the system pressure is greater than a first preset pressure but less than a second preset pressure, the controller outputs a system pressure alarm and reduces the displacement of the hydraulic pump to lower the rotational speed of the hydraulic motor. When the system pressure is greater than or equal to the second preset pressure, the controller outputs another system pressure alarm and reduces the displacement of the hydraulic pump to zero, stopping the hydraulic motor. The second preset pressure is greater than the first preset pressure. This control system can react promptly to abnormal pressure conditions in the cotton picking head and employs different control strategies based on the pressure magnitude, further ensuring the reliability of the cotton picking head's operation.

[0096] In one embodiment, see Figure 6 The control system of the cotton picking head also includes a second pressure detection device 300. The second pressure detection device 300 is used to collect the replenishing oil pressure at the outlet of the replenishing oil pump of the cotton picking head hydraulic system; the controller 100 is also used to output a replenishing oil pressure alarm when the replenishing oil pressure is greater than a fourth preset pressure.

[0097] Specifically, the control system includes a display screen for outputting oil replenishment pressure alarm prompts.

[0098] In one embodiment, see Figure 6 The control system of the cotton picking head also includes a speed detection device 400. The speed detection device 400 is used to collect the speed of the reduction gearbox connected to the cotton picking head; the controller 100 is also used to control the hydraulic pump to reduce its displacement when the speed is lower than a preset speed, thereby reducing the speed of the hydraulic motor. Specifically, the speed detection device 400 can be a speed sensor.

[0099] In one embodiment, see Figure 6 The control system of the cotton picking head also includes a clutch slippage detection device 500. The clutch slippage detection device 500 is used to detect whether the clutch of the cotton picking head is slipping; the controller 100 is also used to output a slippage alarm when clutch slippage occurs. Specifically, the clutch slippage detection device 500 can be a clutch slippage sensor, or it can be a displacement sensor or a speed sensor.

[0100] Specifically, the control system includes a display screen and / or a buzzer alarm for outputting a slippage alarm.

[0101] For the control logic of each component in the control system of the cotton picking head mentioned above, please refer to the relevant description of the control method of the cotton picking head mentioned above, which will not be repeated here.

[0102] When cotton is blocked or stones are sucked into the cotton picking head and damage the picking spindle during cotton picking, it can be addressed through... Figure 3 Medium pressure monitoring, protection and control Figure 4 Cotton head speed adjustment and control Figure 5 The clutch monitoring and protection control system provides layer-by-layer protection for the entire cotton harvesting head hydraulic drive control system, increasing the safety factor of cotton harvesting head operation, reducing the maintenance probability after cotton harvesting head damage, and improving the overall cotton harvesting efficiency of the machine.

[0103] The various embodiments described in this specification are presented in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A control system for a cotton picking head, characterized in that, include: The first pressure detection device is used to collect the system pressure at the outlet of the hydraulic pump of the cotton picking head hydraulic system. The controller, electrically connected to the first pressure detection device, is used to output a system pressure alarm when the system pressure is greater than a first preset pressure and less than a second preset pressure, and to control the displacement of the hydraulic pump to decrease so as to reduce the speed of the hydraulic motor of the cotton picking head hydraulic system; when the system pressure is greater than or equal to the second preset pressure, it outputs a system pressure alarm and controls the displacement of the hydraulic pump to be reduced to zero so as to stop the hydraulic motor. Wherein, the second preset pressure is greater than the first preset pressure; It also includes a speed detection device, which is used to collect the speed of the gearbox connected to the cotton picking head; the controller is also used to control the displacement of the hydraulic pump to reduce the speed of the hydraulic motor when the speed is lower than the preset speed. It also includes a clutch slippage detection device, which is used to detect whether the clutch of the cotton picking head is slipping; the controller is also used to output a slippage alarm prompt when the clutch slips.

2. The control system for the cotton picking head according to claim 1, characterized in that, Also includes: The second pressure detection device is used to collect the replenishment pressure at the outlet of the replenishment pump of the cotton picking head hydraulic system; The controller is also used to output an oil replenishment pressure alarm when the oil replenishment pressure is greater than a fourth preset pressure.

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