Hydraulic control method for stepped seed cotton packing system

Abstract

The application discloses a kind of stepped seed cotton packing hydraulic control methods, belong to agricultural machinery technical field;The method is realized by four accurate control stages: initial pressure maintaining stage, forms stable cotton core;Pressure stepped increase stage, through the discrete step lifting of rocker arm oil cylinder, generate stepped incremental tension, each stage is lifted ΔP until reaches maximum set pressure P max ;Pressure maintaining stage, dynamically keep the belt pressure as P max , when cotton bale diameter reaches set value D3, stop feeding seed cotton, keep system pressure as P max To set time t4;Diameter maintaining stage, quickly adjust rocker arm angle to make cotton bale diameter reach final set value D4, and keep to set time t5;The application effectively solves the problems of poor cotton bale forming stability and uneven density by unique stepped pressure control strategy, combined with sensor feedback and the synergistic effect of hydraulic system, significantly improves cotton bale forming quality and work efficiency.

Description

Technical Field

[0001] This invention relates to the field of agricultural machinery, and in particular to a hydraulic control method for a stepped seed cotton baling system. Background Technology

[0002] Self-propelled cotton balers have become the mainstream trend due to their advantages such as high compression density, convenient transportation, and ability to operate without stopping. However, existing onboard baling devices suffer from reliability and stability issues after baling, resulting in phenomena such as bale cracking, bale scattering, and even bale misshapenness. This is because the control methods during the loading and forming process of seed cotton after harvesting significantly affect the stability of the bale after baling. Therefore, there is an urgent need for a seed cotton baling process control method to increase the stability of bale formation and improve work efficiency.

[0003] Based on this, the present invention proposes a hydraulic control method for a stepped seed cotton baling system, which is used to achieve efficient and high forming stability control of the seed cotton baling process. Summary of the Invention

[0004] To address the above technical problems, this invention provides a hydraulic control method for a stepped seed cotton baling system, which aims to improve the dimensional stability of seed cotton after round bales are formed.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] Its characteristics include at least the following stages:

[0007] <1> Initial pressure holding stage: During this stage, as seed cotton is continuously fed in, the cotton sheets are transported upwards and wound into cotton cores under the friction of the packing straps.

[0008] <2> Pressure increase stage: During this stage, the tension increases in a stepwise manner under the regulation of the belt system;

[0009] <3> Pressure holding stage: During this stage, the belt tension reaches its maximum value and enters the pressure holding state. As the diameter of the cotton bale continues to increase and reaches the set value, the feeding of seed cotton stops and the pressure remains unchanged until the set time.

[0010] <4> Diameter holding stage: In this stage, the rocker arm angle is quickly adjusted to bring the cotton core diameter to the final set value, and the rocker arm position is held for the set time.

[0011] The stepped seed cotton baling hydraulic control system used in the above method includes: a belt drive motor A for driving the belt to rotate, and a hydraulic pump station that can supply oil to the belt drive motor A; a belt drive motor B for driving the belt to rotate, and a hydraulic pump station that can supply oil to the belt drive motor B; a rocker arm cylinder for controlling the lifting and lowering of the rocker arm shaft, which can control the belt tension and cotton bale diameter through the lifting and lowering of the rocker arm shaft, and the hydraulic oil in the hydraulic pump station can enter the rocker arm cylinder; and a cotton box cylinder for controlling the lifting and lowering of the cotton box, which can complete the lifting and lowering of the cotton box. The hydraulic return controller allows hydraulic oil from the hydraulic pump station to enter the rocker arm cylinder when the rocker arm cylinder is raised, and allows hydraulic oil discharged from the rocker arm cylinder to enter the hydraulic oil tank when the rocker arm cylinder is lowered; similarly, it allows hydraulic oil from the hydraulic pump station to enter the cotton box cylinder when the cotton box is raised, and vice versa. The controller also includes a rocker arm tension / compression sensor for real-time monitoring of rocker arm pressure, a rocker arm angle sensor for real-time monitoring of rocker arm angle, and a cotton box proximity switch for monitoring the cotton box's closed state.

[0012] Preferably, the oil return controller can adjust the amount of oil entering the rodless chamber of the rocker arm cylinder, so that the rocker arm cylinder can perform actions such as fast in and slow out.

[0013] Preferably, the oil return controller can adjust the amount of oil entering the rodless chamber of the cotton box cylinder, so that the cotton box cylinder can perform actions such as fast in and slow out.

[0014] Preferably, the oil return controller includes a rocker arm lowering solenoid valve, a rocker arm raising solenoid valve, a rocker arm check valve, a rocker arm pressure reducing valve, a cotton box lowering proportional solenoid valve, a cotton box raising proportional solenoid valve, a cotton box pressure reducing valve A, a cotton box pressure reducing valve B, a cotton box raising solenoid valve, a cotton box lowering solenoid valve, a cotton box check valve A, a cotton box check valve B, and a cotton box throttle valve; the oil outlet of the rocker arm lowering solenoid valve is connected to the rodless chamber of the rocker arm cylinder, and the oil inlets of the rocker arm check valve and the rocker arm shaft proportional valve are connected to the rod chamber of the rocker arm cylinder; the oil outlets of the cotton box lowering proportional solenoid valve and the cotton box check valve A are connected to the rodless chamber of the cotton box cylinder, and the cotton box check valve B and the cotton box raising solenoid valve are connected to the rod chamber of the cotton box cylinder.

[0015] Preferably, the rocker arm angle sensor can monitor the rocker arm shaft angle in real time and convert it into the real-time cotton bale diameter. Combined with the rocker arm tension and pressure sensor monitoring the rocker arm pressure, it enables stage control of the seed cotton baling process.

[0016] Preferably, the rocker arm shaft lifting solenoid valve, the rocker arm lowering solenoid valve, and the rocker arm tension / compression sensor all exhibit a step-like increase in pressure during the pressure increase phase of the seed cotton baling process.

[0017] Preferably, the rocker arm angle sensor, the rocker arm tension / compression sensor, the rocker arm raising solenoid valve, and the rocker arm lowering solenoid valve cooperate with each other to achieve dynamic pressure maintenance.

[0018] Preferably, the rocker arm shaft pressure reducing valve cooperates with the rocker arm tension and pressure sensor. When the value measured by the rocker arm tension and pressure sensor exceeds the set maximum pressure value, the rocker arm shaft pressure reducing valve is activated to release hydraulic oil into the hydraulic oil tank in a certain proportion.

[0019] A hydraulic control method for a stepped seed cotton baling system, compared with the prior art, has the following advantages:

[0020] This invention proposes a hydraulic control method for a stepped seed cotton baling system, which can effectively control the pressure and stages of the seed cotton baling process, thereby improving the forming stability of the baled cotton bales. It can provide a theoretical basis and reference method for revealing the forming mechanism, forming process optimization, and cotton baling machine process design and improvement during the seed cotton baling process. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments 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.

[0022] Figure 1 This is a schematic diagram illustrating the process of control parameter changes during the stages of this invention.

[0023] Figure 2 This is a schematic diagram of the hydraulic system of the present invention;

[0024] The attached diagram lists the components represented by each number as follows:

[0025] 1-One-way adjustable solenoid valve A, 2-Throttle valve A, 3-Belt drive motor A, 4-One-way adjustable solenoid valve B, 5-Throttle valve B, 6-Belt drive motor B, 7-Rocker arm lowering solenoid valve, 8-Rocker arm cylinder, 9-Rocker arm angle sensor, 10-Rocker arm tension / compression sensor, 11-Rocker arm check valve, 12-Cotton box lowering proportional solenoid valve, 13-Cotton box cylinder, 14-Cotton box check valve A, 15-Cotton box check valve B, 16-Cotton box proximity switch, 17-Cotton box lifting solenoid valve, 18-Cotton box pressure reducing valve B, 19-Cotton box lowering solenoid valve, 20-Hydraulic pump station, 21-Hydraulic oil tank, 22-Cotton box lifting proportional solenoid valve, 23-Cotton box pressure reducing valve A, 24-Rocker arm shaft proportional valve, 25-Rocker arm pressure reducing valve, 26-Cotton box throttle valve, 27-Rocker arm raising solenoid valve. Detailed Implementation

[0026] The following will refer to the appendices in the embodiments of the present invention. Figure 1-2 The technical solutions in the embodiments of the present invention are clearly and completely described herein. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0027] Example 1: Reference Figure 1 This is a schematic diagram illustrating the stage control parameter changes in this embodiment. The present invention is a hydraulic control method for a stepped seed cotton baling system, characterized by including at least the following steps:

[0028] <1> Initial pressure holding stage: During this stage, as seed cotton is continuously fed in, the cotton sheets are transported upwards and wound into cotton cores under the friction of the packing straps.

[0029] <2> Pressure increase stage: During this stage, the tension increases in a stepwise manner under the regulation of the belt system;

[0030] <3> Pressure holding stage: During this stage, the belt tension reaches its maximum value and enters the pressure holding state. When the cotton bale diameter reaches the set value, the feeding of seed cotton stops, and the pressure remains unchanged until the set time.

[0031] <4> Diameter holding stage: In this stage, the rocker arm angle is quickly adjusted to bring the cotton core diameter to the final set value, and the rocker arm position is held for the set time.

[0032] Example 2: Reference Figure 2This is a schematic diagram of the hydraulic system in this embodiment. It is a dedicated stepped seed cotton baling hydraulic control system, including: a belt drive motor A (3) for driving the belt to rotate, and a hydraulic pump station (20) that can supply oil to the belt drive motor A (3); a belt drive motor B (6) for driving the belt to rotate, and a hydraulic pump station (20) that can supply oil to the belt drive motor B (6); a rocker arm cylinder (8) for controlling the lifting and lowering of the rocker arm shaft, which can control the belt tension and cotton bale diameter through the lifting and lowering of the rocker arm shaft, and the hydraulic oil in the hydraulic pump station (20) can enter the rocker arm cylinder (8); and a cotton box cylinder (13) for controlling the lifting and lowering of the cotton box, which can complete the lifting and lowering of the cotton box. The return oil controller enables the hydraulic oil in the hydraulic pump station (20) to enter the rocker arm cylinder (8) when the rocker arm cylinder (8) is raised; enables the hydraulic oil discharged from the rocker arm cylinder (8) to enter the hydraulic oil tank (21) when the rocker arm cylinder (8) is lowered; enables the hydraulic oil in the cotton box cylinder (13) to enter the cotton box cylinder (13) when the cotton box is raised; enables the hydraulic oil discharged from the cotton box cylinder (13) to enter the hydraulic oil tank (21) when the cotton box is lowered; rocker arm tension and pressure sensor (10) can monitor the rocker arm pressure in real time; rocker arm angle sensor (9) can monitor the rocker arm angle in real time; cotton box proximity switch (16) can monitor the cotton box closing state.

[0033] Furthermore, the return oil controller can adjust the amount of oil entering the rodless chamber of the rocker arm cylinder (8), so that the rocker arm cylinder (8) can perform actions such as fast in and slow out.

[0034] Furthermore, the oil return controller can adjust the amount of oil entering the rodless chamber of the cotton box cylinder (13), so that the cotton box cylinder (13) can perform actions such as fast in and slow out.

[0035] Furthermore, the return oil controller includes a rocker arm lowering solenoid valve (7), a rocker arm raising solenoid valve (27), a rocker arm check valve (11), a rocker arm pressure reducing valve (25), a cotton box lowering proportional solenoid valve (12), a cotton box raising proportional solenoid valve (22), a cotton box pressure reducing valve A (23), a cotton box pressure reducing valve B (18), a cotton box raising solenoid valve (17), a cotton box lowering solenoid valve (19), a cotton box check valve A (14), a cotton box check valve B (15), and a cotton box throttle valve (26); The oil outlet of the rocker arm lowering solenoid valve (7) is connected to the rodless chamber of the rocker arm cylinder (8), and the oil inlets of the rocker arm check valve (11) and the rocker arm shaft proportional valve (24) are connected to the rod chamber of the rocker arm cylinder (8); the oil outlets of the cotton box lowering proportional solenoid valve (12) and the cotton box check valve A (14) are connected to the rodless chamber of the cotton box cylinder (13), and the cotton box check valve B (15) and the cotton box lifting solenoid valve (17) are connected to the rod chamber of the cotton box cylinder (13).

[0036] Furthermore, the rocker arm cylinder (8) is equipped with the rocker arm angle sensor (9) and the rocker arm tension and pressure sensor (10). The rocker arm angle sensor (9) can monitor the rocker arm shaft angle in real time and convert it into the real-time cotton bale diameter. Combined with the rocker arm pressure value monitored by the rocker arm tension and pressure sensor (10), the stage control of the seed cotton baling process can be realized.

[0037] Furthermore, the oil pumped out by the hydraulic pump station (20) flows into the rocker arm raising solenoid valve (27) and the rocker arm lowering solenoid valve (7), pushing the rocker arm cylinder (8) to lift Δ upwards. P Until the rocker arm tension sensor (10) displays the pressure as P 0+Δ P Then, the oil pumped out by the hydraulic pump station (20) flows into the rocker arm lifting solenoid valve (27) and the rocker arm lowering solenoid valve (7), pushing the rocker arm cylinder (8) to lift Δ upwards. P Until the rocker arm tension sensor (10) displays the pressure as P 0+2Δ P This process continues until the value displayed by the rocker arm tension / compression sensor (10) reaches [a certain value]. P max Overall, the pressure increases in a stepwise manner.

[0038] Furthermore, the rocker arm angle sensor (9), the rocker arm tension / compression sensor (10), the rocker arm raising solenoid valve (27), the rocker arm lowering solenoid valve (7), and the pressure reducing valve cooperate to maintain pressure during the seed cotton feeding process. The pressure is maintained until the value displayed by the rocker arm tension / compression sensor (10) reaches [a certain value]. P maxThe oil pumped out by the hydraulic pump station (20) flows into the rocker arm lifting solenoid valve (27) and the rocker arm lowering solenoid valve (7), pushing the rocker arm cylinder (8) to lift Δ upwards. P When the rocker arm tension / compression sensor (10) displays the pressure as P max +Δ P Then, the oil pumped out by the hydraulic pump station (20) is controlled to flow into the rocker arm lifting solenoid valve (27) and the rocker arm lowering solenoid valve (7), pushing the rocker arm cylinder (8) to lift Δ upwards. P Repeat this action until the wick diameter reaches the set value. D 3. At this time, the value displayed by the rocker arm angle sensor (9) reaches the set value, and the feeding of seed cotton stops. The overall performance is that the pressure is dynamically maintained.

[0039] Furthermore, the rocker arm pressure reducing valve (25) cooperates with the rocker arm tension and pressure sensor (10). When the value measured by the rocker arm tension and pressure sensor (10) exceeds the set maximum pressure value, the rocker arm pressure reducing valve (25) is activated, releasing hydraulic oil into the hydraulic oil tank (21) in a certain proportion.

[0040] A specific application of this embodiment:

[0041] When using this invention, the cotton box lowering system is activated, and the oil pumped by the hydraulic pump station (20) flows through the cotton box lowering solenoid valve (19) and the cotton box one-way valve B (15) into the cotton box cylinder (13), pushing the cotton box downward to close. When the cotton box proximity switch (16) receives a signal, it locks, ensuring that the cotton box is in a closed state. The rocker arm shaft lifting system is activated, and the oil pumped by the hydraulic pump station (20) flows into the rocker arm raising solenoid valve (27) and the rocker arm lowering solenoid valve (7), entering the rocker arm cylinder (8), pushing the rocker arm upward to lift and tension the packing belt. When the rocker arm tension sensor (10) displays the set value, the system is activated. P At 0 o'clock, the belt drive motor A (3) and belt drive motor B (6) are started. The two electromagnets are energized, and the one-way adjustable solenoid valves A (1) and B (4) form a passage. The oil pumped out by the hydraulic pump station (20) flows through the one-way adjustable solenoid valves A (1) and B (4), driving the belt drive motors A (3) and B (6) to rotate, and then driving the belt to rotate at the set speed. Then, the seed cotton is continuously and evenly fed in. Under the friction of the packing belt, the seed cotton is transported upward and wound into a cotton core. When the feedback value of the rocker arm tension and pressure sensor (10) exceeds the set value, the cotton core is fed in. P At 0 o'clock, the hydraulic system controls the hydraulic pump station (20) to pump oil into the rocker arm lifting solenoid valve (27) and the rocker arm lowering solenoid valve (7), and then into the rocker arm cylinder (8), pushing the cylinder to lift Δ o'clock upwards. P Until the rocker arm tension sensor (10) displays the pressure asP 0+Δ P The hydraulic system then controls the hydraulic pump station (20) to pump oil into the rocker arm lifting solenoid valve (27) and the rocker arm lowering solenoid valve (7), and enters the rocker arm cylinder (8), pushing the cylinder to lift Δ upwards. P Until the rocker arm tension sensor (10) displays the pressure as P 0+2Δ P This process continues in a stepwise manner, until the rocker arm pull pressure sensor (10) displays the pressure value as the set maximum value. P max The hydraulic system controls the hydraulic pump station (20) to pump oil into the rocker arm lifting solenoid valve (27) and rocker arm lowering solenoid valve (7), and then into the rocker arm cylinder (8), pushing the cylinder to lift Δ upwards. P The rocker arm tension sensor (10) displays the pressure as follows: P max +Δ P At this time, the hydraulic system controls the hydraulic pump station (20) to pump oil into the rocker arm lifting solenoid valve (27) and the rocker arm lowering solenoid valve (7), and enters the rocker arm cylinder (8), pushing the cylinder to lift Δ P Repeat this action until the rocker arm angle sensor (9) reaches the set value, at which point the cotton core diameter reaches the set value. D 3. Stop feeding seed cotton, maintain constant pressure in the hydraulic cylinder, and hold for the set time. t At 4 o'clock, the angle of the rocker arm cylinder (8) is quickly adjusted to the new set value, at which point the cotton core diameter reaches the final value. D 4. Lock the rocker arm position, and when the time is up... t At 5 o'clock, turn off belt drive motor A (3) and belt drive motor B (6); start the cotton box lifting system. The oil pumped out by the hydraulic pump station (20) flows through the cotton box lifting proportional solenoid valve (22) and cotton box check valve A (14) into the cotton box cylinder (13), pushing the cotton box to open upward, and then completing other work such as unloading cotton.

[0042] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention; in this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example; moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0043] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention; the preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described; obviously, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention; the invention is limited only by the claims and their full scope and equivalents.

Claims

1. A hydraulic control method for a stepped seed cotton baling system, characterized in that: Includes the following stages: <1> Initial pressure holding stage: During this stage, as seed cotton is continuously fed in, the cotton sheets are transported upwards and wound into cotton cores under the friction of the packing straps. <2> Pressure increase stage: During this stage, the tension increases in a stepwise manner under the regulation of the belt system; <3> Pressure holding stage: During this stage, the belt tension reaches its maximum value and enters the pressure holding state. As the diameter of the cotton bale continues to increase and reaches the set value, the feeding of seed cotton stops and the pressure remains unchanged until the set time. <4> Diameter holding stage: In this stage, the rocker arm angle is quickly adjusted to make the cotton core diameter reach the final set value, and the rocker arm position is held for the set time. The stepped seed cotton baling system used in the above method is as follows, including: a belt drive motor A (3) for driving the belt to rotate, a belt drive motor B (6) for driving the belt to rotate, and a hydraulic pump station (20) that can supply oil to the belt drive motor A (3) and the belt drive motor B (6); a rocker arm cylinder (8) for controlling the lifting and lowering of the rocker arm shaft, which can control the belt tension and cotton bale diameter by lifting and lowering the rocker arm shaft, and the hydraulic oil in the hydraulic pump station (20) can enter the rocker arm cylinder (8); a cotton box cylinder (13) for controlling the lifting and lowering of the cotton box; a rocker arm tension and pressure sensor (10) that can monitor the rocker arm pressure in real time; a rocker arm angle sensor (9) that can monitor the rocker arm angle in real time; and a cotton box proximity switch (16) that can monitor the cotton box closing status. The hydraulic pump station (20) pushes the rocker arm cylinder (8) to lift Δ upwards. P Until the rocker arm tension sensor (10) displays the pressure as P 0+Δ P Then, the hydraulic pump station (20) is controlled to push the rocker arm cylinder (8) upward to lift Δ P Until the rocker arm tension sensor (10) displays the pressure as P 0+2Δ P This process continues until the value displayed by the rocker arm tension / compression sensor (10) reaches [a certain value]. P max Overall, the pressure increases in a stepwise manner. When the value displayed by the rocker arm tension / compression sensor (10) reaches P max The hydraulic pump station (20) pushes the rocker arm cylinder (8) to lift Δ upwards. P When the rocker arm tension / compression sensor (10) displays the pressure as P max +Δ P Then, control the hydraulic pump station (20) to push the rocker arm cylinder (8) upward to lift Δ P Repeat this action until the wick diameter reaches the set value. D 3. At this time, the value displayed by the rocker arm angle sensor (9) reaches the set value, and the feeding of seed cotton stops. The overall performance is that the pressure is dynamically maintained.

2. The hydraulic control method for a stepped seed cotton baling system according to claim 1, characterized in that: The stepped seed cotton baling system also includes a return oil controller. When the rocker arm cylinder (8) is raised, the return oil controller allows the hydraulic oil in the hydraulic pump station (20) to enter the rocker arm cylinder (8). When the rocker arm cylinder (8) is lowered, the return oil controller allows the hydraulic oil discharged from the rocker arm cylinder (8) to enter the hydraulic oil tank (21). When the cotton box cylinder (13) is raised, the return oil controller allows the hydraulic oil in the hydraulic pump station (20) to enter the cotton box cylinder (13). When the cotton box is lowered, the return oil controller allows the hydraulic oil discharged from the cotton box cylinder (13) to enter the hydraulic oil tank (21).

3. The hydraulic control method for a stepped seed cotton baling system according to claim 2, characterized in that: The return oil controller can adjust the amount of oil entering the rodless chamber of the rocker arm cylinder (8), so that the rocker arm cylinder (8) can perform actions such as fast in and slow out; the return oil controller can adjust the amount of oil entering the rodless chamber of the cotton box cylinder (13), so that the cotton box cylinder (13) can perform actions such as fast in and slow out.

4. The hydraulic control method for a stepped seed cotton baling system according to claim 2, characterized in that: The return oil controller includes a rocker arm lowering solenoid valve (7), a rocker arm raising solenoid valve (27), a rocker arm check valve (11), a rocker arm pressure reducing valve (25), a cotton box lowering proportional solenoid valve (12), a cotton box raising proportional solenoid valve (22), a cotton box pressure reducing valve A (23), a cotton box pressure reducing valve B (18), a cotton box raising solenoid valve (17), a cotton box lowering solenoid valve (19), a cotton box check valve A (14), a cotton box check valve B (15), and a cotton box throttle valve (26); the rocker arm The oil outlet of the descent solenoid valve (7) is connected to the rodless chamber of the rocker arm cylinder (8), and the oil inlets of the rocker arm check valve (11) and the rocker arm shaft proportional valve (24) are connected to the rod chamber of the rocker arm cylinder (8); the oil outlets of the cotton box descent proportional solenoid valve (12) and the cotton box check valve A (14) are connected to the rodless chamber of the cotton box cylinder (13), and the cotton box check valve B (15) and the cotton box lifting solenoid valve (17) are connected to the rod chamber of the cotton box cylinder (13).

5. The hydraulic control method for a stepped seed cotton baling system according to claim 1, characterized in that: The rocker arm angle sensor (9) can monitor the rocker arm shaft angle in real time and convert it into the real-time cotton bale diameter. Combined with the rocker arm tension and pressure sensor (10) monitoring the rocker arm pressure, it can realize the stage control of the seed cotton baling process.

6. The hydraulic control method for a stepped seed cotton baling system according to claim 4, characterized in that: The rocker arm angle sensor (9), the rocker arm tension and pressure sensor (10), the rocker arm rising solenoid valve (27), and the rocker arm falling solenoid valve (7) work together to achieve dynamic pressure maintenance.

7. The hydraulic control method for a stepped seed cotton baling system according to claim 4, characterized in that: The rocker arm pressure reducing valve (25) works in conjunction with the rocker arm tension and pressure sensor (10). When the value measured by the rocker arm tension and pressure sensor (10) exceeds the set maximum pressure value, the rocker arm pressure reducing valve (25) is activated and releases hydraulic oil into the hydraulic oil tank (21) in a certain proportion.

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