Mining digital proportional integrated valve and control system and control method thereof

Abstract

The invention provides a mining digital proportional integrated valve and a control system and a control method thereof. The mining digital proportional integrated valve is characterized in that a proportional electromagnetic pilot valve is connected with a control side oil way of a proportional throttle valve string assembly and used for controlling the throttling state of the proportional throttle valve string assembly; the proportional throttle valve string assembly serves as a control valve of a rodless cavity oil way in the valve body and is used for controlling the flow of oil entering a rodless cavity, and the valve element displacement sensor is used for detecting the displacement value of a valve element in the proportional throttle valve string assembly. The one-way valve string assembly serves as a control valve of a rod cavity oil way in the valve body and is used for controlling on-off of oil supply of a rod cavity. The controller connecting terminal is used for being externally connected with a controller, and control over the proportional electromagnetic pilot operated valve and the proportional throttle valve string assembly is achieved. According to the mining digital proportional integrated valve, a detection and feedback adjustment mechanism is established, dynamic control over the system flow proportion is achieved, and damage of hydraulic impact to parts of a hydraulic system is avoided.

Description

Technical Field

[0001] This invention relates to the field of hydraulic support control valve technology, specifically to a mining digital proportional integrated valve and its control system and method. Background Technology

[0002] The hydraulic system directional valves of the hydraulic support in the fully mechanized mining face are mostly two-position three-way switching valves, which can only realize the switching of liquid direction and cannot realize flow control, making it difficult to meet the precise control requirements of the hydraulic support.

[0003] At the same time, high-pressure, high-flow emulsion pumps have been widely used in recent years. When the directional valve in the hydraulic system performs the switching operation, the pressure shock causes more and more problems to the hydraulic support and hydraulic system components, seriously affecting the service life and stability of valves, cylinders and pipeline accessories in the system.

[0004] Precise control of hydraulic supports in fully mechanized mining faces now mainly relies on various sensors and inertial navigation systems to detect the support's attitude. Then, algorithms and programs are used to control two-position three-way switching valves and single-stage speed regulating valves to control the support's movements.

[0005] However, the existing two-position three-way switching valve cannot control the flow rate, and the single-stage speed regulating valve can only achieve single-stage flow rate regulation. The control accuracy is limited, and precise control cannot be achieved, resulting in unsatisfactory control effects.

[0006] Given the current situation, achieving precise control and thus avoiding the impact of pressure shocks on the hydraulic system components in the hydraulic support is a pressing technical problem that needs to be solved.

[0007] In order to solve the above problems, people have been seeking an ideal technological solution. Summary of the Invention

[0008] The purpose of this invention is to address the shortcomings of existing technologies by providing a mining-grade digital proportional integrated valve and its control method. This valve is designed with a mechanism for detection and signal feedback regulation, enabling proportional regulation and closed-loop control of the flow rate in the hydraulic support controlled system, thereby reducing the impact of pressure shocks on the hydraulic system components in the hydraulic support.

[0009] To achieve the above objectives, the technical solution adopted by the present invention is: a mining digital proportional integrated valve, comprising a valve body and integrated within the valve body a proportional electromagnetic pilot valve, a proportional throttle valve string assembly, a one-way valve string assembly, a valve core displacement sensor, and a controller connection terminal; The proportional electromagnetic pilot valve is connected to the control side oil circuit of the proportional throttle valve string assembly and is used to control the throttling state of the proportional throttle valve string assembly. The proportional throttle valve string assembly serves as the control valve for the rodless chamber oil circuit in the valve body, and is used to control the flow rate of the oil entering the rodless chamber. The valve core displacement sensor is used to detect the displacement value of the valve core in the proportional throttle valve string assembly. The one-way valve string assembly serves as a control valve with a rod chamber oil passage in the valve body, used to control the on / off supply of oil to the rod chamber. The controller connection terminal is used to connect an external controller to realize the control of the proportional electromagnetic pilot valve and the proportional throttle valve valve string assembly.

[0010] Based on the above, the controller connection terminal and the valve core displacement sensor connection terminal are both integrated into the proportional electromagnetic pilot valve.

[0011] This invention utilizes a proportional electromagnetic pilot valve to control the throttling state of a proportional throttle valve cascade assembly. This ensures the assembly reaches maximum throttling before load-side startup. Then, based on the load's operating state, the proportional electromagnetic pilot valve is adjusted, dynamically regulating the throttling state of the proportional throttle valve cascade assembly to ultimately achieve the desired flow ratio, thus realizing high-precision control. Furthermore, because the assembly reaches maximum throttling before startup and is then adjusted to the appropriate ratio, this process avoids hydraulic shocks that could affect the hydraulic system components at the load end.

[0012] Based on the above, the controller is integrated into the proportional solenoid pilot valve or the valve body. This further improves integration, resulting in a more compact structure, shorter control chain, and higher efficiency.

[0013] Based on the above, the valve body is provided with a pilot oil inlet and a pilot oil outlet corresponding to the proportional electromagnetic pilot valve, and the output oil circuit of the proportional electromagnetic pilot valve is connected to the proportional throttle valve string assembly. The valve body is provided with a main supply / return port and a rodless chamber outlet port for the corresponding proportional throttle valve string assembly. The valve body is provided with a rod chamber oil supply port and a rod chamber oil outlet port corresponding to the one-way valve string assembly. The return port of the one-way valve string assembly is shared with the main return port. This allows for a more rational oil circuit layout in the valve body and a higher degree of integration of the valve body.

[0014] As described above, a filter is installed on the oil inlet side of the proportional solenoid pilot valve to prevent clogging.

[0015] A mining digital proportional integrated valve control system includes a pump station, a hydraulic cylinder, a controller, a two-position three-way electro-hydraulic directional valve, a three-position four-way electro-hydraulic directional valve, a hydraulic cylinder displacement sensor, and the mining digital proportional integrated valve. The pilot oil circuit of the two-position three-way electro-hydraulic directional valve and the proportional solenoid pilot valve are connected to achieve liquid supply and return in conjunction with the pump station. The three-position four-way electro-hydraulic directional valve and the proportional throttle valve valve string assembly are connected in the rodless chamber oil circuit and the one-way valve string assembly is connected in the rod chamber oil circuit, which is used to combine with the pump station to realize liquid supply and return. The cylinder displacement sensor is used to detect the displacement value of the piston rod in the cylinder; The controller is connected to the cylinder displacement sensor, the valve core displacement sensor and the proportional solenoid pilot valve respectively, so as to control the current value of the proportional solenoid pilot valve according to the displacement data of the cylinder displacement sensor, and then control the throttling state of the proportional throttle valve string assembly according to the displacement value of the valve core displacement sensor.

[0016] The mining digital proportional integrated valve control system provided by this invention is based on the working state setting of the hydraulic cylinder. Through the detection of the hydraulic cylinder displacement sensor and the valve core displacement sensor, it cooperates with the aforementioned mining digital proportional integrated valve to form a closed-loop control with detection and feedback. The entire control process is dynamic, ensuring control accuracy. Moreover, since the proportional adjustment starts from the maximum throttling state, the risk of impact on hydraulic system components such as the hydraulic cylinder is avoided.

[0017] As described above, a safety valve is installed on the output side oil circuit of the one-way valve cascade assembly. This is primarily used to prevent various risks arising from impacts to the valve body or excessive oil pressure.

[0018] A control method for a mining digital proportional integrated valve, comprising the aforementioned mining digital proportional integrated valve control system, controlled through the following process: Before the cylinder extends: control the two-position three-way electro-hydraulic directional valve to switch, control the proportional electromagnetic pilot valve in the proportional speed control integrated valve to be energized and switch, so that the pilot oil circuit is open, and the control fluid enters the proportional throttle valve string assembly to adjust the throttle state to the maximum throttle state. The hydraulic cylinder performs the extension action by controlling the three-position four-way electro-hydraulic directional valve to switch directions, opening the oil circuit in the rodless chamber, and allowing fluid to enter the rodless chamber of the cylinder. Based on the detection data from the cylinder displacement sensor, the actual operating speed of the hydraulic rod and the system flow rate are calculated as the basic values ​​for adjustment. Based on the obtained basic values, the proportional solenoid pilot valve is adjusted, which in turn adjusts the valve core displacement value in the proportional throttle valve string, i.e., adjusting the opening of the proportional throttle valve to the target throttling state. At the same time, the cylinder displacement sensor and the valve core displacement sensor provide real-time feedback on whether the adjustment values ​​meet the target, thus achieving closed-loop control. Before the hydraulic cylinder performs the retraction action: control the two-position three-way electro-hydraulic directional valve to switch, control the proportional electromagnetic pilot valve in the proportional speed control integrated valve to be energized and switch, so that the pilot oil circuit is open, and the control fluid enters the proportional throttle valve string assembly to adjust the throttle state to the maximum throttle state. The hydraulic cylinder performs a retraction action by controlling a three-position four-way electro-hydraulic directional valve to switch directions, opening the oil circuit in the rod chamber, allowing fluid to enter the rod chamber and return to the rodless chamber. Based on the detection data from the cylinder displacement sensor, the actual operating speed of the hydraulic rod and the system flow rate are calculated as the basic values ​​for adjustment. Based on the obtained basic values, the proportional solenoid pilot valve is adjusted, which in turn adjusts the valve core displacement value in the proportional throttle valve string, i.e., adjusting the opening of the proportional throttle valve to the target throttling state. At the same time, the cylinder displacement sensor and the valve core displacement sensor provide real-time feedback on whether the adjustment values ​​meet the standards, thus achieving closed-loop control.

[0019] In the control method provided by the present invention, different execution operation steps are determined by controlling the different control processes of the cylinder extension state and retraction state, so that the proportional speed regulating integrated valve can be used to achieve precise control and adjustment of the terminal in both processes. Moreover, the fluid supply in both processes is adjusted from the maximum throttling state, avoiding the impact on the hydraulic equipment at the load end.

[0020] Based on the above, the two-position three-way electro-hydraulic directional valve, the three-position four-way electro-hydraulic directional valve, the proportional solenoid pilot valve, the cylinder displacement sensor, and the valve core displacement sensor are all connected to the controller to achieve control and signal acquisition, resulting in a higher degree of integration.

[0021] This invention has outstanding substantive features and significant progress compared to the prior art. Specifically, this invention utilizes a proportional electromagnetic pilot valve to dynamically control the throttling state of the proportional throttle valve series assembly, and then uses a valve core displacement sensor and the working status of the load terminal for detection and feedback to construct a control feedback closed-loop scheme based on a mining digital proportional integrated valve. This results in higher adjustment and control accuracy and greater flexibility for the hydraulic system terminal equipment. Moreover, due to the throttling control of the proportional electromagnetic pilot valve, the hydraulic shock problem caused by high-pressure, high-flow hydraulic systems can be avoided. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the valve circuit of the mining digital proportional integrated valve in Embodiment 1 of the present invention.

[0023] Figure 2 This is one of the structural schematic diagrams of the mining digital proportional integrated valve in Embodiment 1 of the present invention.

[0024] Figure 3 This is the second schematic diagram of the structure of the mining digital proportional integrated valve in Embodiment 1 of the present invention.

[0025] Figure 4 This is a schematic diagram of the valve circuit of the mining digital proportional integrated valve control system in Embodiment 2 of the present invention.

[0026] Figure 5 This is the control logic diagram of the control method in Embodiment 2 of the present invention.

[0027] Figure 6 This is a state change diagram of the control method in Embodiment 2 of the present invention.

[0028] In the diagram: 1. Valve body; 2. Proportional solenoid pilot valve; 3. Proportional throttle valve cascade assembly; 4. Check valve cascade assembly; 5. Valve core displacement sensor; 6. Controller connection terminal; 7. Filter; 8. Pump station; 9. Hydraulic cylinder; 10. Two-position three-way electro-hydraulic directional valve; 11. Three-position four-way electro-hydraulic directional valve; 12. Hydraulic cylinder displacement sensor; 13. Mining digital proportional integrated valve; 14. Safety valve. Detailed Implementation

[0029] The technical solution of the present invention will be further described in detail below through specific embodiments.

[0030] Example 1 like Figures 1-3 As shown, a mining digital proportional integrated valve includes a valve body 1 and a proportional electromagnetic pilot valve 2, a proportional throttle valve string assembly 3, a one-way valve string assembly 4, a valve core displacement sensor 5, and a controller connection terminal 6 integrated in the valve body 1.

[0031] The proportional solenoid pilot valve 2 is connected to the control side oil circuit of the proportional throttle valve string assembly 3 and is used to control the throttling state of the proportional throttle valve string assembly 3. Under normal circumstances, before starting, the proportional solenoid pilot valve 2 drives the proportional throttle valve string assembly 3 to directly adjust to the maximum throttling state, so that during the start-up process, the main output oil circuit is immediately in the maximum throttling state, deliberately avoiding the impact of the high-pressure, high-flow hydraulic system on the components.

[0032] The proportional throttle valve string assembly 3 serves as the control valve for the rodless chamber oil circuit in the valve body 1, and is used to control the flow rate of the oil entering the rodless chamber. The valve core displacement sensor 5 is used to detect the displacement value of the valve core in the proportional throttle valve string assembly 3, that is, the opening degree of the proportional throttle valve string assembly 3, so as to realize the detection feedback of the throttling state of the proportional throttle valve string assembly.

[0033] The one-way valve string assembly 4 serves as a control valve for the rod chamber oil circuit in the valve body 1, used to control the on / off supply of oil to the rod chamber. It is directly connected to the external pump station and related external directional valves to achieve control of the rod chamber.

[0034] The controller connection terminal 6 is used to connect an external controller to realize the control and detection of the proportional electromagnetic pilot valve 2 and the proportional throttle valve series assembly 3. In this embodiment, the controller is connected to the controller connection terminal 6 by wiring. The specific position of the terminal is set on the proportional electromagnetic pilot valve 2 to improve integration and reduce control links.

[0035] In a preferred embodiment, to further improve integration, the controller can be directly integrated inside the proportional solenoid pilot valve 2.

[0036] The valve body 1 is provided with a pilot oil inlet P and a pilot oil outlet T corresponding to the proportional electromagnetic pilot valve 2. The output oil circuit of the proportional electromagnetic pilot valve 2 is connected to the proportional throttle valve string assembly 3.

[0037] The valve body 1 is provided with a main supply / return port VA and a rodless chamber outlet CB on the corresponding proportional throttle valve string assembly 3. The valve body 1 is provided with a rod chamber oil supply port VB and a rod chamber oil outlet port CB corresponding to the one-way valve string assembly 4. The return port of the one-way valve string assembly 4 is shared with the main return port.

[0038] To prevent clogging of the proportional solenoid pilot valve 2, a filter 7 is installed on the oil inlet side of the proportional solenoid pilot valve 2.

[0039] For specific application scenarios, please refer to Example 2.

[0040] Example 2 like Figures 4-6 As shown, a mining digital proportional integrated valve control system includes a pump station 8, a hydraulic cylinder 9, a controller, a two-position three-way electro-hydraulic directional valve 10, a three-position four-way electro-hydraulic directional valve 11, a hydraulic cylinder displacement sensor 12, and the mining digital proportional integrated valve 13.

[0041] The two-position three-way electro-hydraulic directional valve 10 is connected to the pilot oil circuit of the proportional solenoid pilot valve 2, and is used in conjunction with the pump station 8 to realize liquid supply and return. The three-position four-way electro-hydraulic directional valve 11 is connected to the rodless chamber oil circuit of the proportional throttle valve string assembly 3 and the rod chamber oil circuit of the one-way valve string assembly 4, and is used to combine with the pump station 8 to realize liquid supply and liquid return. The cylinder displacement sensor 12 is used to detect the displacement value of the piston rod in the cylinder; The controller is connected to the cylinder displacement sensor 12, the valve core displacement sensor 5, and the proportional electromagnetic pilot valve 2 respectively. Based on the displacement data of the cylinder displacement sensor 12, it controls the proportional electromagnet current value of the proportional electromagnetic pilot valve 2, and then controls the throttling state of the proportional throttle valve string assembly based on the displacement value of the valve core displacement sensor 5.

[0042] To ensure safety, a safety valve 14 is provided on the output side oil circuit of the one-way valve string assembly 4, which is mainly used to avoid various risks caused by impact on the valve body or excessive oil pressure.

[0043] In this embodiment, the cylinder displacement sensor 12 is a cylinder LVDT displacement sensor, and the valve core displacement sensor 5 is a valve core LVDT displacement sensor.

[0044] The control method for the above-mentioned mining digital proportional integrated valve includes the following process: Before the cylinder extends: control the two-position three-way electro-hydraulic directional valve 10 to switch to the right position, control the proportional electromagnetic pilot valve 2 in the mining digital proportional integrated valve 13 to be energized and switch, so that the pilot oil circuit is open, and the control fluid enters the proportional throttle valve valve string assembly 3, and adjusts the throttle state to the maximum throttle state, that is, the rodless chamber of the output cylinder enters the maximum throttle state. The hydraulic cylinder performs an extension action by controlling the three-position four-way electro-hydraulic directional valve 11 to switch to the left position, opening the oil circuit in the rodless chamber, and allowing fluid to enter the rodless chamber of the cylinder. Based on the detection data of the cylinder displacement sensor 12, the actual operating speed of the hydraulic rod and the system flow rate are calculated as the basic values ​​for adjustment. Based on the obtained basic values, the proportional solenoid pilot valve 2 is adjusted, which in turn adjusts the valve core displacement value in the proportional throttle valve string 3, that is, adjusting the opening of the proportional throttle valve to the target throttling state, thereby achieving the purpose of adjusting the operating speed of the hydraulic cylinder. At the same time, the cylinder displacement sensor 12 and the valve core displacement sensor 5 provide real-time feedback on whether the adjustment values ​​meet the standards, realizing closed-loop control and precise adjustment.

[0045] Before the hydraulic cylinder performs the retraction action: control the two-position three-way electro-hydraulic directional valve 11 to switch to the right position, control the proportional electromagnetic pilot valve 2 in the mining digital proportional integrated valve 13 to be energized and switch, so that the pilot oil circuit is open, and the control fluid enters the proportional throttle valve valve string assembly, and adjusts the throttle state to the maximum throttle state, that is, the rodless chamber of the output cylinder enters the maximum throttle state. The hydraulic cylinder performs a retraction action by controlling the three-position four-way electro-hydraulic directional valve 11 to switch to the right position, opening the oil circuit in the rod chamber, allowing fluid to enter the rod chamber of the cylinder 9 and return fluid to the rodless chamber. Due to the throttling state of the rodless chamber, the return speed is very slow. Based on the detection data of the cylinder displacement sensor 12, the actual operating speed of the hydraulic rod and the system flow rate are calculated as the basic values ​​for adjustment. Based on the obtained basic values, the proportional solenoid pilot valve 2 is adjusted, which in turn adjusts the valve core displacement value in the proportional throttle valve string 3, that is, adjusting the opening of the proportional throttle valve to the target throttling state, thereby achieving the purpose of adjusting the operating speed of the hydraulic cylinder. At the same time, the cylinder displacement sensor and the valve core displacement sensor provide real-time feedback on whether the adjustment value meets the standard, realizing closed-loop control.

[0046] In this embodiment, the two-position three-way electro-hydraulic directional valve 10, the three-position four-way electro-hydraulic directional valve 11, the proportional solenoid pilot valve 2, the cylinder displacement sensor 12, and the valve core displacement sensor 5 are all connected to the controller to achieve control and signal acquisition, resulting in a higher degree of integration.

[0047] This embodiment achieves closed-loop control through displacement value feedback from two LVDT displacement sensors, thereby enabling precise control of cylinder movements and precise adjustment of the hydraulic support. Furthermore, it can also be applied to high-pressure, high-flow hydraulic systems to achieve proportional control of system flow when the directional valve performs a reversing action, reducing or avoiding hydraulic shock.

[0048] In specific application cases, the aforementioned mining digital proportional integrated valve is installed in the hydraulic control system of the mine hydraulic support side guard plate to achieve local system flow proportional control and adjustment, enabling precise control of the side guard jacks, and thus precise control of the extension and retraction actions of the hydraulic support side guard plate, providing a safer working space for the fully mechanized mining face. Similarly, the mining digital proportional integrated valve is installed in the control pipeline system of the mine hydraulic support pushing jack to achieve local system flow proportional control and adjustment, enabling precise control of the pushing jacks, and thus precise control of the hydraulic support's pushing and pulling actions, ensuring the straightness of the hydraulic support and the chute, guaranteeing good coal cutting performance of the coal mining machine, and ultimately improving production efficiency.

[0049] Meanwhile, with the widespread application of high-pressure, high-flow emulsion pumps in recent years, the pressure shocks generated by directional valves during operation in high-pressure, high-flow hydraulic systems have become increasingly prominent, causing problems for hydraulic support and hydraulic system components, severely affecting the service life and stability of valves, cylinders, and pipeline accessories. Adding the aforementioned proportional speed-regulating integrated valve to the pipelines of systems experiencing severe shocks can adjust the system flow before system operation, reducing or avoiding hydraulic shocks generated by directional valve operation and protecting the stability of the hydraulic system and its components.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the present invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. A mining digital proportional integrated valve, characterized in that: Includes the valve body and integrated within it the proportional solenoid pilot valve, the proportional throttle valve string assembly, the check valve string assembly, the valve core displacement sensor, and the controller connection terminals. The proportional electromagnetic pilot valve is connected to the control side oil circuit of the proportional throttle valve string assembly and is used to control the throttling state of the proportional throttle valve string assembly. The proportional throttle valve string assembly serves as the control valve for the rodless chamber oil circuit in the valve body, and is used to control the flow rate of the oil entering the rodless chamber. The valve core displacement sensor is used to detect the displacement value of the valve core in the proportional throttle valve string assembly. The one-way valve string assembly serves as a control valve with a rod chamber oil passage in the valve body, used to control the on / off supply of oil to the rod chamber. The controller connection terminal is used to connect an external controller to realize the control of the proportional electromagnetic pilot valve and the proportional throttle valve valve string assembly.

2. The mining digital proportional integrated valve according to claim 1, characterized in that: The controller connection terminal and the valve core displacement sensor connection terminal are both integrated into the proportional electromagnetic pilot valve.

3. The mining digital proportional integrated valve according to claim 1 or 2, characterized in that: The controller is integrated into the proportional electromagnetic pilot valve or the valve body.

4. The mining digital proportional integrated valve according to claim 1, characterized in that: The valve body is provided with a pilot oil inlet and a pilot oil outlet corresponding to the proportional electromagnetic pilot valve, and the output oil circuit of the proportional electromagnetic pilot valve is connected to the proportional throttle valve string assembly. The valve body is provided with a main supply / return port and a rodless chamber outlet port for the corresponding proportional throttle valve string assembly. The valve body is provided with a rod chamber oil supply port and a rod chamber oil outlet port corresponding to the one-way valve string assembly, and the oil return port of the one-way valve string assembly is shared with the main oil return port.

5. The mining digital proportional integrated valve according to claim 1, characterized in that: A filter is installed on the oil inlet side of the proportional electromagnetic pilot valve.

6. A mining digital proportional integrated valve control system, characterized in that: The system includes a pump station, a hydraulic cylinder, a controller, a two-position three-way electro-hydraulic directional valve, a three-position four-way electro-hydraulic directional valve, a hydraulic cylinder displacement sensor, and a mining digital proportional integrated valve as described in any one of claims 1-5. The pilot oil circuit of the two-position three-way electro-hydraulic directional valve and the proportional solenoid pilot valve are connected to achieve liquid supply and return in conjunction with the pump station. The three-position four-way electro-hydraulic directional valve and the proportional throttle valve valve string assembly are connected in the rodless chamber oil circuit and the one-way valve string assembly is connected in the rod chamber oil circuit, which is used to combine with the pump station to realize liquid supply and return. The cylinder displacement sensor is used to detect the displacement value of the piston rod in the cylinder; The controller is connected to the cylinder displacement sensor, the valve core displacement sensor and the proportional solenoid pilot valve respectively, so as to control the current value of the proportional solenoid pilot valve according to the displacement data of the cylinder displacement sensor, and then control the throttling state of the proportional throttle valve string assembly according to the displacement value of the valve core displacement sensor.

7. The mining digital proportional integrated valve control system according to claim 6, characterized in that: A safety valve is provided in the oil circuit on the output side of the one-way valve string assembly.

8. A control method for a mining digital proportional integrated valve, characterized in that: The mining digital proportional integrated valve control system according to claim 6 or 7 controls the following process: Before the cylinder extends: control the two-position three-way electro-hydraulic directional valve to switch, control the proportional electromagnetic pilot valve in the proportional speed control integrated valve to be energized and switch, so that the pilot oil circuit is open, and the control fluid enters the proportional throttle valve string assembly to adjust the throttle state to the maximum throttle state. The hydraulic cylinder performs the extension action by controlling the three-position four-way electro-hydraulic directional valve to switch directions, opening the oil circuit in the rodless chamber, and allowing fluid to enter the rodless chamber of the cylinder. Based on the detection data from the cylinder displacement sensor, the actual operating speed of the hydraulic rod and the system flow rate are calculated as the basic values ​​for adjustment. Based on the obtained basic values, the proportional solenoid pilot valve is adjusted, which in turn adjusts the valve core displacement value in the proportional throttle valve string, i.e., adjusting the opening of the proportional throttle valve to the target throttling state. At the same time, the cylinder displacement sensor and the valve core displacement sensor provide real-time feedback on whether the adjustment values ​​meet the target, thus achieving closed-loop control. Before the hydraulic cylinder performs the retraction action: control the two-position three-way electro-hydraulic directional valve to switch, control the proportional electromagnetic pilot valve in the proportional speed control integrated valve to be energized and switch, so that the pilot oil circuit is open, and the control fluid enters the proportional throttle valve string assembly to adjust the throttle state to the maximum throttle state. The hydraulic cylinder performs a retraction action by controlling a three-position four-way electro-hydraulic directional valve to switch directions, opening the oil circuit in the rod chamber, allowing fluid to enter the rod chamber and return to the rodless chamber. Based on the detection data from the cylinder displacement sensor, the actual operating speed of the hydraulic rod and the system flow rate are calculated as the basic values ​​for adjustment. Based on the obtained basic values, the proportional solenoid pilot valve is adjusted, which in turn adjusts the valve core displacement value in the proportional throttle valve string, i.e., adjusting the opening of the proportional throttle valve to the target throttling state. At the same time, the cylinder displacement sensor and the valve core displacement sensor provide real-time feedback on whether the adjustment values ​​meet the standards, thus achieving closed-loop control.

9. The control method for the mining digital proportional integrated valve according to claim 8, characterized in that: The two-position three-way electro-hydraulic directional valve, the three-position four-way electro-hydraulic directional valve, the proportional solenoid pilot valve, the cylinder displacement sensor, and the valve core displacement sensor are all connected to the controller to achieve control and signal acquisition.

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