Header deflection hydraulic control system and agricultural machine

Abstract

The present application relates to a kind of header deflection hydraulic control system and agricultural machinery, and the deflection control of cutting knife hinged on header is used for cutting knife;Including accumulator, first two-position two-way directional control valve, pressure sensor and multiple cutting knife oil cylinders, cutting knife oil cylinder both ends are respectively hinged with header and cutting knife and drive cutting knife to swing up and down relative to header;The pressure input of first two-position two-way directional control valve is connected with hydraulic source by control pipeline, control pipeline is equipped with control valve, the pressure output of first two-position two-way directional control valve is communicated with the rod cavity or rod cavity of multiple cutting knife oil cylinders by adjusting pipeline, and multiple cutting knife oil cylinders are connected in parallel on adjusting pipeline by adjusting branch;Adjusting pipeline is also connected with energy storage branch, and accumulator is connected on energy storage branch;Pressure sensor for monitoring the pressure of cutting knife oil cylinder is also provided on adjusting pipeline.The hardness of cutting knife can be freely adjusted in the present application, adapt to different ground conditions requirements, and header is adaptable.

Description

Technical Field

[0001] This invention relates to the field of agricultural machinery technology, specifically to a hydraulic control system for header deflection and agricultural machinery. Background Technology

[0002] Currently, the header parameters of combine harvesters are not adjustable, and they can only harvest a limited variety of crops, resulting in poor adaptability and low operating efficiency. Flexible headers, on the other hand, have non-adjustable deflection, making them unsuitable for complex harvesting conditions. They can only harvest a limited variety of crops, requiring different headers for different crops, leading to complex operation, high costs, and low efficiency. Summary of the Invention

[0003] In order to solve one or more of the above-mentioned technical problems, improve the adaptability of the header, and increase the efficiency of operation, this invention is dedicated to a hydraulic control system for header deflection and agricultural machinery, which solves the adjustment needs of header parameters for different harvesting operation conditions, improves the adaptability of the header to crops, and reduces user investment costs.

[0004] The technical solution of this invention to solve the above-mentioned technical problems is as follows: A hydraulic control system for the deflection of a cutting table, used for controlling the deflection of a cutting blade hinged to the cutting table; comprising an accumulator, a first two-position two-way directional valve, a pressure sensor, and multiple cutting blade cylinders, wherein the two ends of each cutting blade cylinder are respectively hinged to the cutting table and the cutting blade, and drive the cutting blade to swing up and down relative to the cutting table; the pressure input port of the first two-position two-way directional valve is connected to a hydraulic source through a control pipeline, and a control valve is provided on the control pipeline; the pressure output port of the first two-position two-way directional valve is connected to the rod chamber or rodless chamber of each of the multiple cutting blade cylinders through an adjustment pipeline, and the multiple cutting blade cylinders are connected in parallel on the adjustment pipeline through an adjustment branch; an energy storage branch is also connected to the adjustment pipeline, and an accumulator is connected to the energy storage branch; a pressure sensor for monitoring the pressure of the cutting blade cylinders is also provided on the adjustment pipeline.

[0005] The beneficial effects of this invention are: by incorporating a pressure sensor, a two-position two-way reversing valve, and a cutting blade cylinder, the hardness of the cutting blade can be freely adjusted to adapt to different terrain conditions. Furthermore, it can control the switching between a flexible and rigid cutting platform, resulting in strong adaptability.

[0006] Based on the above technical solution, the present invention can be further improved as follows.

[0007] Furthermore, the first two-position two-way directional valve is a two-position two-way one-way shut-off valve, the control valve is a two-position three-way directional valve, the P port of the two-position three-way directional valve is connected to the hydraulic power source, the T port of the two-position three-way directional valve is connected to the oil tank, and the A port of the two-position three-way directional valve is connected to the pressure input port of the first two-position two-way directional valve.

[0008] Furthermore, the first two-position two-way directional valve is a two-position two-way bidirectional shut-off valve, the control valve is a reel control valve, the P port of the reel control valve is connected to a hydraulic power source, the T port of the reel control valve is connected to an oil tank, the A port of the reel control valve is connected to the pressure input port of the first two-position two-way directional valve, the control pipeline is also connected to a reel control branch, the end of the reel branch is connected to a reel cylinder, the reel branch is provided with a second two-position two-way directional valve, the pressure input end of the second two-position two-way directional valve is connected to the A port of the reel control valve, and the pressure output end of the second two-position two-way directional valve is connected to the reel cylinder.

[0009] The beneficial effect of adopting the above-mentioned further solution is that the hydraulic control system for the header deflection can use the control oil of the feeder cylinder on the header as the hydraulic source.

[0010] Furthermore, the second two-position two-way directional valve is a two-position two-way bidirectional shut-off valve.

[0011] The beneficial effect of adopting the above-mentioned further solution is that by using a two-position two-way bidirectional shut-off valve, independent control of the cutter cylinder and the reel cylinder can be achieved.

[0012] Furthermore, the reel control valve is a two-position three-way directional valve.

[0013] Furthermore, a throttle valve is provided on the regulating pipeline downstream of the pressure output port of the first and second position two-way reversing valve.

[0014] The beneficial effects of adopting the above-mentioned further solution are: to slowly reduce the pressure of the cutting cylinder and to gradually reduce the hardness of the cutting cylinder.

[0015] Furthermore, the cutter is hinged to the cutting platform by multiple cutter lifting mechanisms. The cutter lifting mechanisms are arranged front and rear, with the front end of the cutter lifting mechanism fixedly connected to the cutter and the rear end of the cutter lifting mechanism hinged to the cutting platform.

[0016] Furthermore, each of the cutter lifting mechanisms is provided with a corresponding cutter cylinder, the cylinder of the cutter cylinder is hinged to the cutting table, and the piston rod of the cutter cylinder is hinged to the cutter lifting mechanism.

[0017] The beneficial effect of adopting the above-mentioned further solution is that, since the cutting blade lifting mechanism at different positions of the cutting blade bears different forces, the cutting blade cylinder corresponding to each cutting blade lifting mechanism can adopt different cylinder diameters to achieve synchronous operation.

[0018] Furthermore, it also includes a controller, wherein the pressure sensor is used to detect the pressure value of the cutting cylinder in real time and send it to the controller, and the controller is used to convert the pressure value into the deflection value of the cutting table and compare the deflection value with a preset deflection value;

[0019] When the deflection value is less than the preset deflection value, the control valve is de-energized, the first two-position two-way directional valve is energized, and the hydraulic oil of the cutter cylinder and the accumulator returns to the oil tank through the first two-position two-way directional valve; under the action of the accumulator, the pressure of the cutter cylinder gradually decreases, the hardness of the cutter decreases, and the deflection of the cutting table increases until the deflection value reaches the preset deflection value.

[0020] When the deflection value is greater than the preset deflection value, the control valve is energized, the first and second position two-way directional valves are de-energized, and the hydraulic oil enters the rodless chamber of the cutter cylinder through the first and second position two-way directional valves; under the action of the accumulator, the pressure of the cutter cylinder gradually increases, the hardness of the cutter increases, and the deflection of the cutting table decreases until the deflection value reaches the preset deflection value.

[0021] When the preset deflection value is the stiffness value of the cutter, after the pressure value of the cutter cylinder reaches the stiffness value, the cutter cylinder will completely lift the cutter. At this time, the cutting table has no flexibility and is a rigid cutting table.

[0022] The advantages of adopting the above-mentioned further solutions are: it allows for free adjustment of the cutting head hardness, adapting to different terrain requirements. Furthermore, it allows switching between flexible and rigid cutting heads, demonstrating strong adaptability.

[0023] An agricultural machine includes the aforementioned header deflection hydraulic control system, and further includes a bridge assembly and an agricultural machine body. The bridge assembly is mounted on the front side of the agricultural machine body, and the header is mounted on the bridge assembly. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structural principle of the hydraulic control system for the cutting table deflection in Embodiment 1 of the present invention;

[0025] Figure 2 This is a schematic diagram of the structural principle of the hydraulic control system for the cutting table deflection in Embodiment 2 of the present invention;

[0026] Figure 3 This is a three-dimensional structural diagram of the cutting platform of the present invention;

[0027] Figure 4 This is a three-dimensional structural diagram of the cutting blade on the cutting platform of the present invention;

[0028] Figure 5 This is a schematic diagram of the assembly structure of the cutting cylinder of the present invention;

[0029] Figure 6This is a schematic diagram of the structure of the agricultural machinery of the present invention.

[0030] The attached diagram lists the components represented by each number as follows:

[0031] 100. Cutting table; 101. Cutting blade; 102. Cutting blade transmission box;

[0032] 200. Cutter cylinder; 201. Accumulator; 202. First two-position two-way directional valve; 203. Pressure sensor; 204. Control valve; 206. Second two-position two-way directional valve; 207. Reel cylinder; 208. Throttle valve;

[0033] 300. Cutter lifting mechanism; 400. Bridge assembly; 500. Agricultural machinery body. Detailed Implementation

[0034] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0035] Example 1

[0036] like Figure 1 As shown in this embodiment, a hydraulic control system for the deflection of a cutting table is used to control the deflection of a cutter 101 hinged to a cutting table 100. It includes an accumulator 201, a first two-position two-way directional valve 202, a pressure sensor 203, and multiple cutter cylinders 200. The two ends of each cutter cylinder 200 are hinged to the cutting table 100 and the cutter 101 respectively, driving the cutter 101 to swing up and down relative to the cutting table 100. The pressure input port of the first two-position two-way directional valve 202 is connected to a hydraulic source via a control pipeline. A control valve is provided on the control pipeline. The pressure output port of the first two-position two-way directional valve 202 is connected to the rod-side or rodless-side chambers of the multiple cutter cylinders 200 via an adjustment pipeline. The multiple cutter cylinders 200 are connected in parallel on the adjustment pipeline via adjustment branches. An energy storage branch is also connected to the adjustment pipeline, and the accumulator 201 is connected to the energy storage branch. A pressure sensor 203 is also provided on the adjustment pipeline to monitor the pressure of the cutter cylinders.

[0037] To achieve stable and effective driving of the cutting blade 101, multiple cutting blade cylinders 200 are evenly distributed. Each cutting blade cylinder 200 is a single-acting plunger cylinder, and the oil ports of the multiple cutting blade cylinders 200 are connected in parallel. The pressure of the cutting blade cylinder 200 directly reflects the deflection of the cutting table 100; the higher the pressure of the cutting blade cylinder 200, the smaller the deflection of the cutting table 100, and the lower the pressure of the cutting blade cylinder 200, the greater the deflection of the cutting table 100.

[0038] like Figure 1As shown, in this embodiment, the first two-position two-way directional valve 202 is a two-position two-way one-way shut-off valve, and the control valve 204 is a two-position three-way directional valve. The P port of the two-position three-way directional valve is connected to a hydraulic power source, the T port of the two-position three-way directional valve is connected to an oil tank, and the A port of the two-position three-way directional valve is connected to the pressure input port of the first two-position two-way directional valve 202.

[0039] like Figure 1 As shown, in this embodiment, a throttle valve 208 is provided on the regulating pipeline downstream of the pressure output port of the first two-position two-way reversing valve 202.

[0040] Specifically, such as Figures 3-5 As shown, in this embodiment, the cutter 101 is hinged to the cutting table 100 via multiple cutter lifting mechanisms 300. The cutter lifting mechanisms 300 are arranged front to back, with their front ends fixedly connected to the cutter 101 and their rear ends hinged to the cutting table 100. Each cutter lifting mechanism is equipped with a corresponding cutter cylinder, the cylinder barrel of which is hinged to the cutting table, and the piston rod of which is hinged to the cutter lifting mechanism. The cutter 101 is located at the front of the cutting table 100, and the cutter transmission box 102 is located on the left side of the cutting table 100. It is responsible for transmitting power to the cutter 101. Since the cutter 101 is a flexible structure and its deflection is controlled by the hydraulic control system for the deflection of the cutting table, the cutter transmission box 102 will move up and down with the cutter 101, resulting in different weights at different positions of the cutter 101. Since the cutter lifting mechanism 300 at different positions of the cutter 101 bears different forces, the cutter cylinder 200 corresponding to each cutter lifting mechanism 300 can adopt different cylinder diameters to achieve synchronous action.

[0041] The hydraulic control system for the cutting table deflection in this embodiment also includes a controller. The pressure sensor 203 is used to detect the pressure value of the cutting cylinder 200 in real time and send it to the controller. The controller is used to convert the pressure value into the deflection value of the cutting table 100 (wherein the conversion process can be implemented using existing technology) and compare the deflection value with a preset deflection value.

[0042] When the deflection value is less than the preset deflection value, the control valve 204 is de-energized, the first two-position two-way directional valve 202 is energized, and the hydraulic oil of the cutter cylinder 200 and the accumulator 201 returns to the oil tank through the first two-position two-way directional valve 202; under the action of the accumulator 201, the pressure of the cutter cylinder 200 gradually decreases, the hardness of the cutter 101 decreases, and the deflection of the cutting table 100 increases until the deflection value reaches the preset deflection value;

[0043] When the deflection value is greater than the preset deflection value, the control valve 204 is energized, the first two-position two-way directional valve 202 is de-energized, and the hydraulic oil enters the rodless chamber of the cutter cylinder 200 through the first two-position two-way directional valve 202; under the action of the accumulator 201, the pressure of the cutter cylinder 200 gradually increases, the hardness of the cutter 101 increases, and the deflection of the cutting table 100 decreases until the deflection value reaches the preset deflection value;

[0044] When the preset deflection value is the stiffness value of the cutter 101, the pressure value of the cutter cylinder 200 reaches the rigidity value, and the cutter cylinder 200 fully lifts the cutter. At this time, the cutter head 100 is not flexible and is a rigid cutter head. After the operator selects a rigid cutter head in the system, the system automatically controls the reel control valve to be energized. The pressure will enter the cutter cylinder 200 through the reel control valve, the first and second position two-way reversing valve 202, and the throttle valve 208. The pressure sensor 203 detects the pressure value of the cutter cylinder 200. When the pressure value reaches the rigidity value, the reel control valve is de-energized, and the cutter head 100 is a rigid cutter head.

[0045] Depending on different terrain conditions, the operator can infinitely adjust the deflection value of the cutting table, or set n different cutting table deflection values ​​in the operating system. The operator only needs to judge the working conditions and select different modes. The system automatically controls the reel control valve and the first and second position two-way reversing valve 202 to automatically match the pressure values ​​of different cutter cylinders 200.

[0046] This embodiment, by incorporating a pressure sensor, a two-position two-way reversing valve, and a cutter cylinder, allows for free adjustment of the cutter's hardness to adapt to different terrain conditions. Furthermore, it can control the switching between a flexible and rigid cutting platform, demonstrating strong adaptability.

[0047] This embodiment also provides an agricultural machine, including the above-mentioned header deflection hydraulic control system, and also includes a bridge assembly 400 and an agricultural machine body 500. The bridge assembly 400 is installed on the front side of the agricultural machine body 500, and the header 100 is installed on the bridge assembly 400.

[0048] Example 2

[0049] like Figure 2As shown in this embodiment, a hydraulic control system for cutter head deflection is used to control the deflection of the cutter 101 hinged to the cutter head 100. It includes an accumulator 201, a first two-position two-way directional valve 202, a pressure sensor 203, and multiple cutter cylinders 200. The two ends of each cutter cylinder 200 are hinged to the cutter head 100 and the cutter 101 respectively, driving the cutter 101 to swing up and down relative to the cutter head 100. The pressure input port of the first two-position two-way directional valve 202 is connected to the hydraulic system via a control pipeline. The control pipeline is connected to the power source. A control valve 204 is provided on the control pipeline. The pressure output port of the first two-position two-way reversing valve 202 is connected to the rod chamber or rodless chamber of multiple cutting cylinders 200 through the regulating pipeline. Multiple cutting cylinders 200 are connected in parallel on the regulating pipeline through the regulating branch. An energy storage branch is also connected to the regulating pipeline, and an energy storage device 201 is connected to the energy storage branch. A pressure sensor 203 for monitoring the pressure of the cutting cylinders 200 is also provided on the regulating pipeline.

[0050] To achieve stable and effective driving of the cutting blade 101, multiple cutting blade cylinders 200 are evenly distributed. Each cutting blade cylinder 200 is a single-acting plunger cylinder, and the oil ports of the multiple cutting blade cylinders 200 are connected in parallel. The pressure of the cutting blade cylinder 200 directly reflects the deflection of the cutting table 100; the higher the pressure of the cutting blade cylinder 200, the smaller the deflection of the cutting table 100, and the lower the pressure of the cutting blade cylinder 200, the greater the deflection of the cutting table 100.

[0051] like Figure 2 As shown, in this embodiment, the first two-position two-way directional valve 202 is a two-position two-way bidirectional shut-off valve, and the control valve 204 is a reel control valve. The P port of the reel control valve is connected to a hydraulic power source, the T port is connected to an oil tank, and the A port is connected to the pressure input port of the first two-position two-way directional valve 202. A reel control branch is also connected to the control pipeline, and the end of the reel branch is connected to a reel cylinder 207. A second two-position two-way directional valve 206 is provided on the reel branch. The pressure input end of the second two-position two-way directional valve 206 is connected to the A port of the reel control valve, and the pressure output end of the second two-position two-way directional valve 206 is connected to the reel cylinder 207. The header deflection hydraulic control system can use the control oil of the reel cylinder on the header as a hydraulic power source.

[0052] like Figure 2 As shown, the second two-position two-way directional valve 206 in this embodiment is a two-position two-way bidirectional shut-off valve. Using a two-position two-way bidirectional shut-off valve allows for independent control of both the cutter cylinder and the reel cylinder.

[0053] The reel control valve in this embodiment is a two-position three-way reversing valve.

[0054] like Figure 2 As shown, in this embodiment, a throttle valve 208 is provided on the regulating pipeline downstream of the pressure output port of the first two-position two-way reversing valve 202. This causes the pressure of the cutting cylinder to decrease slowly, and the hardness of the cutting cylinder to decrease gradually.

[0055] Specifically, such as Figures 3-5 As shown, in this embodiment, the cutter 101 is hinged to the cutting table 100 via multiple cutter lifting mechanisms 300. The cutter lifting mechanisms 300 are arranged front to back, with their front ends fixedly connected to the cutter 101 and their rear ends hinged to the cutting table 100. Each cutter lifting mechanism 300 is correspondingly provided with a cutter cylinder 200, the cylinder of which is hinged to the cutting table 100, and the piston rod of which is hinged to the cutter lifting mechanism 300. The cutter 101 is located at the front of the cutting table 100, and the cutter transmission box 102 is located on the left side of the cutting table 100. It is responsible for transmitting power to the cutter 101. Since the cutter 101 is a flexible structure and its deflection is controlled by the hydraulic control system for the deflection of the cutting table, the cutter transmission box 102 will move up and down with the cutter 101, resulting in different weights at different positions of the cutter 101. Since the cutter lifting mechanism 300 at different positions of the cutter 101 bears different forces, the cutter cylinder 200 corresponding to each cutter lifting mechanism 300 can adopt different cylinder diameters to achieve synchronous action.

[0056] The hydraulic control system for the cutting table deflection in this embodiment also includes a controller. The pressure sensor 203 is used to detect the pressure value of the cutting cylinder 200 in real time and send it to the controller. The controller is used to convert the pressure value into the deflection value of the cutting table 100 (wherein the conversion process can be implemented using existing technology) and compare the deflection value with a preset deflection value.

[0057] When the deflection value is less than the preset deflection value, the control valve 204 is de-energized, the first two-position two-way directional valve 202 is energized, and the hydraulic oil of the cutter cylinder 200 and the accumulator 201 returns to the oil tank through the first two-position two-way directional valve 202; under the action of the accumulator 201, the pressure of the cutter cylinder 200 gradually decreases, the hardness of the cutter 101 decreases, and the deflection of the cutting table 100 increases until the deflection value reaches the preset deflection value;

[0058] When the deflection value is greater than the preset deflection value, the control valve 204 is energized, the first two-position two-way directional valve 202 is de-energized, and the hydraulic oil enters the rodless chamber of the cutter cylinder 200 through the first two-position two-way directional valve 202; under the action of the accumulator 201, the pressure of the cutter cylinder 200 gradually increases, the hardness of the cutter 101 increases, and the deflection of the cutting table 100 decreases until the deflection value reaches the preset deflection value;

[0059] When the preset deflection value is the stiffness value of the cutter 101, the pressure value of the cutter cylinder 200 reaches the rigidity value, and the cutter cylinder 200 fully lifts the cutter. At this time, the cutter head 100 is not flexible and is a rigid cutter head. After the operator selects a rigid cutter head in the system, the system automatically controls the reel control valve to be energized. The pressure will enter the cutter cylinder 200 through the reel control valve, the first and second position two-way reversing valve 202, and the throttle valve 208. The pressure sensor 203 detects the pressure value of the cutter cylinder 200. When the pressure value reaches the rigidity value, the reel control valve is de-energized, and the cutter head 100 is a rigid cutter head.

[0060] Depending on different terrain conditions, the operator can infinitely adjust the deflection value of the cutting table, or set n different cutting table deflection values ​​in the operating system. The operator only needs to judge the working conditions and select different modes. The system automatically controls the reel control valve and the first and second position two-way reversing valve 202 to automatically match the pressure values ​​of different cutter cylinders 200.

[0061] This embodiment uses the control hydraulic fluid of the reel cylinder on the header as a hydraulic source, enabling free adjustment of the header blade hardness to adapt to different terrain requirements. Furthermore, it can switch between flexible and rigid headers, making it highly adaptable.

[0062] This embodiment also provides an agricultural machine, including the above-mentioned header deflection hydraulic control system, and also includes a bridge assembly 400 and an agricultural machine body 500. The bridge assembly 400 is installed on the front side of the agricultural machine body 500, and the header 100 is installed on the bridge assembly 400.

[0063] In the description of this invention, it should be understood that the terms "front" and "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0064] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0065] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0066] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0067] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," 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. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0068] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A hydraulic control system for the deflection of a cutting table, used for controlling the deflection of a cutting blade hinged to the cutting table; characterized in that, The system includes an accumulator, a first and second-position two-way directional valve, a pressure sensor, and multiple cutting blade cylinders. Each cutting blade cylinder is hinged at both ends to the cutting table and the cutting blade, respectively, driving the cutting blade to swing up and down relative to the cutting table. The pressure input port of the first and second-position two-way directional valve is connected to a hydraulic power source via a control pipeline. A control valve is installed on the control pipeline. The pressure output port of the first and second-position two-way directional valve is connected to the rod-side or rodless-side chambers of the multiple cutting blade cylinders via regulating pipelines. The multiple cutting blade cylinders are connected in parallel on the regulating pipeline via regulating branches. An energy storage branch is also connected to the regulating pipeline, and an accumulator is connected to the energy storage branch. A pressure sensor for monitoring the pressure of the cutting blade cylinders is also installed on the regulating pipeline. The first two-position two-way directional valve is a two-position two-way bidirectional shut-off valve, the control valve is a two-position three-way directional valve, the control valve is a reel control valve, the P port of the reel control valve is connected to a hydraulic power source, the T port of the reel control valve is connected to an oil tank, the A port of the reel control valve is connected to the pressure input port of the first two-position two-way directional valve, the control pipeline is also connected to a reel control branch, the end of the reel branch is connected to a reel cylinder, the reel branch is provided with a second two-position two-way directional valve, the pressure input end of the second two-position two-way directional valve is connected to the A port of the reel control valve, and the pressure output end of the second two-position two-way directional valve is connected to the reel cylinder; The cutter is located at the front of the header, and the cutter drive box is located on the left side of the header, responsible for transmitting power to the cutter. Since the cutter is a flexible structure and its deflection is adjusted by the header deflection hydraulic control system, the cutter drive box moves up and down with the cutter, resulting in different weights at different positions of the cutter. Because the cutter lifting mechanism at different positions of the cutter bears different forces, each cutter lifting mechanism uses a cutter cylinder with a different cylinder diameter to achieve synchronous action.

2. The hydraulic control system for cutting table deflection according to claim 1, characterized in that, The second two-position two-way directional valve is a two-position two-way bidirectional shut-off valve.

3. The hydraulic control system for cutting table deflection according to claim 1, characterized in that, The reel control valve is a two-position three-way reversing valve.

4. The hydraulic control system for cutting table deflection according to claim 1, characterized in that, A throttle valve is installed on the regulating pipeline downstream of the pressure output port of the first and second position two-way reversing valve.

5. The hydraulic control system for cutting table deflection according to claim 1, characterized in that, The cutter is hinged to the cutting platform by multiple cutter lifting mechanisms. The cutter lifting mechanisms are arranged front and rear, with the front end of the cutter lifting mechanism fixedly connected to the cutter and the rear end of the cutter lifting mechanism hinged to the cutting platform.

6. The hydraulic control system for cutting table deflection according to claim 5, characterized in that, Each of the cutter lifting mechanisms is equipped with a corresponding cutter cylinder. The cylinder of the cutter cylinder is hinged to the cutting table, and the piston rod of the cutter cylinder is hinged to the cutter lifting mechanism.

7. The hydraulic control system for cutting table deflection according to claim 1, characterized in that, It also includes a controller. The pressure sensor is used to detect the pressure value of the cutting cylinder in real time and send it to the controller. The controller is used to convert the pressure value into the deflection value of the cutting table and compare the deflection value with a preset deflection value. When the deflection value is less than the preset deflection value, the control valve is de-energized, the first two-position two-way directional valve is energized, and the hydraulic oil of the cutter cylinder and the accumulator returns to the oil tank through the first two-position two-way directional valve; under the action of the accumulator, the pressure of the cutter cylinder gradually decreases, the hardness of the cutter decreases, and the deflection of the cutting table increases until the deflection value reaches the preset deflection value. When the deflection value is greater than the preset deflection value, the control valve is energized, the first and second position two-way directional valves are de-energized, and the hydraulic oil enters the rodless chamber of the cutter cylinder through the first and second position two-way directional valves; under the action of the accumulator, the pressure of the cutter cylinder gradually increases, the hardness of the cutter increases, and the deflection of the cutting table decreases until the deflection value reaches the preset deflection value. When the preset deflection value is the stiffness value of the cutter, after the pressure value of the cutter cylinder reaches the stiffness value, the cutter cylinder will completely lift the cutter. At this time, the cutting table has no flexibility and is a rigid cutting table.

8. An agricultural machine, characterized in that, The device includes the hydraulic control system for header deflection as described in any one of claims 1 to 7, and further includes a bridge assembly and an agricultural machinery body, wherein the bridge assembly is mounted on the front side of the agricultural machinery body, and the header is mounted on the bridge assembly.

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