Control method, processor, device and hydraulic system for a hydraulic system

Abstract

The application relates to the field of engineering machinery, in particular to a control method for a hydraulic system, a processor, an apparatus, a hydraulic system and a storage medium. The method comprises the following steps: in the case of receiving an oil replacement signal, controlling an electromagnetic reversing valve to be in a first working position, so that a first working oil port of the electromagnetic reversing valve is communicated with a third working oil port; controlling a closed pump to be in a standby state, so that the oil pressure of an oil outlet of the closed pump is equal, so that the oil in a first rod cavity and the oil in a second rod cavity are guided into an oil tank through a communication cavity and the first working oil port of the electromagnetic reversing valve; starting a reset operation, so that the hydraulic system enters a preparation working state. Through the above technical scheme, by controlling the working states of the electromagnetic reversing valve and the closed pump, the oil in the rod cavity is replaced, so that only the oil in the rod cavity is replaced, the exchange of the oil between the rod cavity and the rodless cavity is avoided, and the risk of water and impurities entering the pumping system is reduced.

Description

Technical Field

[0001] This application relates to the field of engineering machinery, and more specifically, to a control method, processor, device, hydraulic system, and storage medium for a hydraulic system. Background Technology

[0002] Current concrete pumping equipment typically uses two pumping cylinders connected in series to drive the reciprocating motion of the concrete piston, achieving the suction and pushing actions. When the piston rod of one pumping cylinder extends, its return oil pushes the piston rod of the other pumping cylinder to retract. Because the two cylinders are connected in series, the oil in their connecting chambers will deteriorate over time due to prolonged operation. At the same time, impurities and moisture brought in by the piston rod will accumulate in the connecting chambers, easily leading to poor oil cleanliness, emulsification, and further deterioration of the oil.

[0003] In the existing technology, a U-shaped tube is installed on the pumping cylinder. When the piston of the pumping cylinder passes through the U-shaped tube each time, the oil in the rod chamber will exchange with the oil in the rodless chamber, resulting in moisture and impurities entering the system. The U-shaped tube will replace the hydraulic oil in the connecting chamber with each stroke of the pumping cylinder. However, when the oil is replaced, it will exchange with the rodless chamber through the U-shaped tube, resulting in moisture and impurities entering the pumping system. Summary of the Invention

[0004] The purpose of this application is to provide a control method, processor, device, hydraulic system, and storage medium for a hydraulic system that replaces oil in the rod chamber and prevents moisture and impurities from entering the pumping system.

[0005] To achieve the above objectives, this application provides a control method for a hydraulic system. The hydraulic system includes a closed-loop pump, a first pumping cylinder, a second pumping cylinder, and a solenoid directional valve. The closed-loop pump is connected to the first rodless chamber of the first pumping cylinder and the second rodless chamber of the second pumping cylinder, respectively. The first rod chamber of the first pumping cylinder and the second rod chamber of the second pumping cylinder are connected via a connecting chamber. The solenoid directional valve includes a first working port communicating with the connecting chamber, a second working port communicating with an oil source, and a third working port communicating with an oil tank. The control method includes:

[0006] Upon receiving an oil displacement signal, the solenoid directional valve is controlled to be in the first working position so that the first working port of the solenoid directional valve is connected to the third working port.

[0007] The closed-loop pump is kept in standby mode so that the oil pressure at the outlet of the closed-loop pump is equal, so that the oil in the first rod chamber and the oil in the second rod chamber are introduced into the oil tank through the connecting chamber and the solenoid reversing valve.

[0008] Initiate the reset operation to bring the hydraulic system into a ready-to-operate state.

[0009] In the embodiments of this application, initiating a reset operation to put the hydraulic system into a ready-to-work state includes: when the closed-loop pump has been in standby mode for a first preset duration, controlling the solenoid directional valve to a second working position, so that the first working port, second working port, and third working port of the solenoid directional valve are all closed; controlling the closed-loop pump to replenish oil to the first rodless chamber or the second rodless chamber, so that the piston rod of the first pumping cylinder or the second pumping cylinder extends; when the replenishment displacement of the closed-loop pump reaches a preset displacement, controlling the solenoid directional valve to a third working position, so that the first working port and the second working port are connected; when the solenoid directional valve has been in the third working position for a second preset duration, controlling the solenoid directional valve to a second working position, so that the hydraulic system enters a ready-to-work state.

[0010] In embodiments of this application, the hydraulic system further includes a first displacement sensor and a second displacement sensor. The first displacement sensor is installed in the first pumping cylinder, and the second displacement sensor is installed in the second pumping cylinder. The control method further includes: after controlling the closed pump to be in standby mode, obtaining the first position of the first piston rod of the first pumping cylinder and the second position of the second piston rod of the second pumping cylinder through the first displacement sensor and the second displacement sensor respectively; and initiating a reset operation when it is determined that the first position and the second position coincide with the first preset position.

[0011] In the embodiments of this application, the start-up reset operation includes: controlling the solenoid directional valve to be in the second working position, so that the first working port, the second working port, and the third working port of the solenoid directional valve are all closed; controlling the closed pump to replenish oil to the first rodless chamber or the second rodless chamber, so that the piston rod of the first pumping cylinder or the second pumping cylinder extends; when the replenishment displacement of the closed pump reaches the preset displacement, controlling the solenoid directional valve to be in the third working position, so that the first working port of the solenoid directional valve is connected to the second working port; when the first position or the second position coincides with the second preset position, controlling the closed pump to be in standby mode, and controlling the solenoid directional valve to be in the second working position.

[0012] In embodiments of this application, the hydraulic system further includes a first position detection device and a second position detection device. The first position detection device is used to detect whether the first piston rod of the first pumping cylinder has reached the position of the first position detection device, and the second position detection device is used to detect whether the second piston rod of the second pumping cylinder has reached the position of the second position detection device. The control method further includes: after controlling the closed pump to be in standby mode, acquiring first detection signals sent by the first position detection device and the second position detection device respectively, the first detection signal indicating that both the first position detection device and the second position detection device have detected the piston rod; and initiating a reset operation according to the first detection signal.

[0013] In embodiments of this application, the hydraulic system further includes a third position detection device and a fourth position detection device. The third position detection device is used to detect whether the first piston rod has reached the position of the third position detection device, and the fourth position detection device is used to detect whether the second piston rod has reached the position of the fourth position detection device. The start-up reset operation includes: controlling the solenoid directional valve to be in the second working position, so that the first working port, the second working port, and the third working port of the solenoid directional valve are all closed; controlling the closed pump to replenish oil to the first rodless chamber or the second rodless chamber, so that the piston rod of the first pumping cylinder or the second pumping cylinder extends; when the replenishment displacement of the closed pump reaches the preset displacement, controlling the solenoid directional valve to be in the third working position, so that the first working port and the second working port of the solenoid directional valve are connected; acquiring a second detection signal sent by the third position detection device or the fourth position detection device, the second detection signal indicating that the third position detection device or the fourth position detection device has detected the piston rod; controlling the closed pump to be in standby state according to the second detection signal, and controlling the solenoid directional valve to be in the second working position.

[0014] A second aspect of this application provides a processor configured to perform any of the above-described control methods for a hydraulic system.

[0015] A third aspect of this application provides a control device for a hydraulic system, including the processor described above.

[0016] The above technical solution eliminates the U-shaped tube connecting the rod chamber and the rodless chamber in the prior art. Instead, it connects the connecting chamber that links the first rod chamber and the second rod chamber to the solenoid directional valve. By controlling the working state of the solenoid directional valve and the closed pump, the oil in the rod chamber is replaced. This replaces only the oil in the rod chamber, avoiding oil exchange between the rod chamber and the rodless chamber, and reducing the risk of moisture and impurities entering the pumping system.

[0017] A fourth aspect of this application provides a hydraulic system, the hydraulic system comprising:

[0018] Closed-loop pump;

[0019] The first pumping cylinder includes a first rodless chamber, a first rod chamber, and a first piston rod, wherein the first rodless chamber is connected to a closed pump.

[0020] The second pumping cylinder includes a second rodless chamber, a second rod chamber, and a second piston rod. The second rodless chamber is connected to the closed pump, and the first rod chamber and the second rod chamber are connected through a connecting chamber.

[0021] Piston rod detection device, used to detect the position of piston rod;

[0022] The electromagnetic reversing valve includes a first working port connected to the connecting chamber, a second working port connected to the oil source, and a third working port connected to the oil tank.

[0023] The processor, electrically connected to the piston rod detection device and the solenoid directional valve, is configured as follows:

[0024] Upon receiving an oil displacement signal, the electromagnetic directional valve is controlled to switch directions, and the operating status of the closed pump is controlled.

[0025] Adjust the working position of the solenoid directional valve and the working state of the closed pump according to the position of the piston rod.

[0026] In an embodiment of this application, the piston rod detection device includes: a first displacement sensor installed on a first pumping cylinder for acquiring a first position of the first piston rod; and a second displacement sensor installed on a second pumping cylinder for acquiring a second position of the second piston rod.

[0027] In embodiments of this application, the piston rod detection device includes: a first position detection device for detecting whether the first piston rod has reached the position of the first position detection device; a second position detection device for detecting whether the second piston rod has reached the position of the second position detection device; a third position detection device for detecting whether the first piston rod has reached the position of the third position detection device; and a fourth position detection device for detecting whether the second piston rod has reached the position of the fourth position detection device.

[0028] In embodiments of this application, the hydraulic system further includes: a check valve, the inlet of which is connected to an oil source, and the outlet of which is connected to a second working port, for preventing oil from flowing back from the solenoid directional valve to the oil source; and a water suction filter, the inlet of which is connected to a third working port, and the outlet of which is connected to an oil tank, for cleaning the oil introduced into the oil tank.

[0029] The fifth aspect of this application provides a machine-readable storage medium storing instructions that, when executed by a processor, cause the processor to be configured to perform any of the control methods for a hydraulic system described above.

[0030] The above technical solution eliminates the U-shaped tube connecting the rod chamber and the rodless chamber in the prior art. Instead, it connects the connecting chamber, which links the first rod chamber and the second rod chamber, to a solenoid directional valve. A piston detection device installed in the pumping cylinder detects the position of the piston rod, causing oil to be forced out by the piston rod, thus replacing the oil in the rod chamber. This ensures that the hydraulic system only replaces the oil in the rod chamber, avoiding oil exchange between the rod chamber and the rodless chamber, and reducing the risk of moisture and impurities entering the pumping system.

[0031] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0032] The accompanying drawings are provided to further illustrate the present application and form part of the specification. They are used together with the following detailed description to explain the present application, but do not constitute a limitation thereof. In the drawings:

[0033] Figure 1 A flowchart illustrating a control method for a hydraulic system according to an embodiment of this application is shown schematically.

[0034] Figure 2 The schematic diagram illustrates the structure of a hydraulic system in one embodiment of this application. Figure 1 ;

[0035] Figure 3 The schematic diagram illustrates the structure of a hydraulic system in one embodiment of this application. Figure 2 ;

[0036] Figure 4 The schematic diagram illustrates the structure of a hydraulic system in one embodiment of this application. Figure 3 ;

[0037] Figure 5 A flowchart illustrating a control method for a hydraulic system in yet another embodiment of this application is shown schematically.

[0038] Figure 6 The schematic diagram illustrates the structure of a hydraulic system in one embodiment of this application. Figure 4 ;

[0039] Figure 7 The schematic diagram illustrates the structure of a hydraulic system in one embodiment of this application. Figure 5 ;

[0040] Figure 8 The diagram illustrates the internal structure of a computer device according to an embodiment of this application.

[0041] Explanation of reference numerals in the attached figures

[0042] 1. Closed-loop pump; 2. First pumping cylinder; 3. Second pumping cylinder; 4. Solenoid directional valve; 5. First rodless chamber; 6. Second rodless chamber; 7. First rod chamber; 8. Second rod chamber; 9. Connecting chamber; A. First working port; P. Second working port; T. Third working port; 10. Oil tank; 11. First piston rod; 12. Second piston rod; 13. First displacement sensor; 14. Second displacement sensor; 15. First position detection device; 16. Second position detection device; 17. Third position detection device; 18. Fourth position detection device; 19. Piston rod detection device; 20. Check valve; 21. Water suction filter; 22. Concrete piston cleaning water tank. Detailed Implementation

[0043] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0044] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0045] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0046] like Figure 1 As shown, a flowchart of a control method for a hydraulic system in an embodiment of this application is illustrated schematically. Figure 1 As shown, a control method for a hydraulic system is provided, comprising the following steps:

[0047] Step 101: Upon receiving an oil displacement signal, control the solenoid directional valve to be in the first working position so that the first working port of the solenoid directional valve is connected to the third working port.

[0048] Step 102: Control the closed pump to standby mode, so that the oil pressure at the outlet of the closed pump is equal, so that the oil in the first rod chamber and the oil in the second rod chamber are introduced into the oil tank through the connecting chamber and the solenoid reversing valve.

[0049] Step 103: Initiate the reset operation to put the hydraulic system into a ready-to-work state.

[0050] like Figure 2 As shown, a schematic diagram of the hydraulic system in an embodiment of this application is illustrated. Figure 2 As shown, the hydraulic system includes a closed-loop pump 1, a first pumping cylinder 2, a second pumping cylinder 3, and a solenoid directional valve 4. The closed-loop pump 1 is connected to the first rodless chamber 5 of the first pumping cylinder 2 and the second rodless chamber 6 of the second pumping cylinder 3. The first rod chamber 7 of the first pumping cylinder 2 and the second rod chamber 8 of the second pumping cylinder 3 are connected through a connecting chamber 9. The solenoid directional valve includes a first working port A connected to the connecting chamber 9, a second working port P connected to the oil source, and a third working port T connected to the oil tank 10.

[0051] Upon receiving an oil displacement signal, the processor can control the solenoid directional valve 4 to be in the first working position. When the solenoid directional valve 4 is in the first working position, its first working port A and third working port T are connected. In other words, the processor instructs the solenoid directional valve 4 to be in the first working position, thereby connecting the connecting chamber 9 and the oil tank 10 through the first working port A and the third working port T. The processor can control the closed-loop pump 1 to be in standby mode. When the closed-loop pump 1 is in standby mode, the oil pressure at the outlet of the closed-loop pump 1 is equal. That is, the closed-loop pump 1 provides equal pressure to the inlet of the first rodless chamber 5 or the inlet of the second rodless chamber 6. At this time, the pressure at the outlet of the closed-loop pump 1 can cause the first piston rod 11 in the first pumping cylinder 2 and the second piston rod 12 in the second pumping cylinder 3 to extend. Through the first piston rod 11 and the second piston rod 12, the oil in the first rod chamber 7 and the second rod chamber 8 is squeezed into the connecting chamber 9. Thus, the oil in the first rod chamber 7 and the second rod chamber 8 is introduced into the oil tank 10 through the connecting chamber 9 and the first working oil port A and the third working oil port T connected in the solenoid directional valve 4. After the oil in the first rod chamber 7 and the second rod chamber 8 is introduced into the oil tank 10, the processor can initiate a reset operation to put the hydraulic system into a ready-to-work state.

[0052] In one embodiment, initiating a reset operation to put the hydraulic system into a ready-to-work state includes: when the closed-loop pump has been in standby mode for a first preset duration, controlling the solenoid directional valve to a second working position, so that the first working port, second working port, and third working port of the solenoid directional valve are all closed; controlling the closed-loop pump to replenish oil to the first rodless chamber or the second rodless chamber, so that the piston rod of the first pumping cylinder or the second pumping cylinder extends; when the replenishment displacement of the closed-loop pump reaches a preset displacement, controlling the solenoid directional valve to a third working position, so that the first working port and the second working port are connected; when the solenoid directional valve has been in the third working position for a second preset duration, controlling the solenoid directional valve to a second working position, so that the hydraulic system enters a ready-to-work state.

[0053] The processor controls the closed-loop pump 1 to be in standby mode. When the closed-loop pump 1 remains in standby mode for a predetermined duration, the processor can control the solenoid directional valve 4 to be in its second operating position. In this second operating position, the first working port A, the second working port P, and the third working port T of the solenoid directional valve 4 are all closed. The processor can then control the closed-loop pump 1 to replenish oil to either the first rodless chamber 5 or the second rodless chamber 6, causing the piston rod in the pumping cylinder receiving the replenished oil to extend. When the replenishment displacement of the closed-loop pump 1 reaches the preset displacement, the processor can control the solenoid directional valve 4 to be in the third working position. In this third working position, the first working port A of the solenoid directional valve 4 is connected to the second working port P. This means the oil source and the connecting chamber 9 are connected through the first working port A and the second working port P. Oil can flow from the oil source into the connecting chamber 9 through the second working port P and the first working port A of the solenoid directional valve 4, and then into the rod chamber of the pumping cylinder, thereby pressing the piston rod to the retracted state. The processor can set a second preset duration, which can be set by the operator according to the operating conditions of the hydraulic system, to ensure that the oil can press the piston rod to its optimal retracted state. When the solenoid directional valve 4 is in the third working position for the second preset duration, the processor can control the solenoid directional valve 4 to be in the second working position, closing all working ports, so that the hydraulic system enters a ready-to-work state.

[0054] For example, assuming the closed-loop pump 1 replenishes oil to the second rodless chamber 6, the second piston rod 12 in the second pumping cylinder 3 can remain extended due to the oil in the second rodless chamber 6. When the replenishment displacement of the closed-loop pump 1 reaches the preset displacement, the processor can control the solenoid directional valve 4 to be in the third working position, so that the oil is introduced from the oil source through the second working port P and the first working port A of the solenoid directional valve 4 into the connecting chamber 9, and then enters the rod chamber of the pumping cylinder through the connecting chamber 9. At this time, the second piston rod 12 is kept extended by the oil supplied by the closed-loop pump 1 to the second rodless chamber 6. In the current state, the oil entering the second rod chamber 8 from the connecting chamber 9 cannot push the second piston rod 12, while the first piston rod 11 is not squeezed by the oil supplied by the closed pump 1. Therefore, the oil entering the first rod chamber 7 from the connecting chamber 9 can push the first piston rod 11 to retract, eventually bringing the first piston rod 11 to the optimal retracted state. At this time, the first piston rod 11 of the first pumping cylinder 2 is in the retracted state, and the second piston rod 12 of the second pumping cylinder 3 is in the extended state. The processor can control the solenoid directional valve 4 to be in the second working position, so that the hydraulic system enters the ready-to-work state.

[0055] In one embodiment, the hydraulic system further includes a first displacement sensor and a second displacement sensor. The first displacement sensor is installed in the first pumping cylinder, and the second displacement sensor is installed in the second pumping cylinder. The control method further includes: after controlling the closed pump to be in standby mode, obtaining the first position of the first piston rod of the first pumping cylinder and the second position of the second piston rod of the second pumping cylinder through the first displacement sensor and the second displacement sensor respectively; and initiating a reset operation when it is determined that the first position and the second position coincide with the first preset position.

[0056] like Figure 3The hydraulic system shown also includes a first displacement sensor 13 and a second displacement sensor 14. The first displacement sensor is installed in the first pumping cylinder 2 and can be used to detect the position of the first piston rod 11. The second displacement sensor is installed in the second pumping cylinder 3 and can be used to detect the position of the second piston rod 12. After the processor controls the closed pump 1 to be in standby mode, the processor can obtain the first position of the first piston rod 11 and the second position of the second piston rod 12 through the first displacement sensor 13 and the second displacement sensor 14, respectively. The processor can set the optimal extension position of the piston rod as a first preset position. When the pressure provided by the closed pump 1 to the first rodless chamber 5 and the second rodless chamber 6 in standby mode causes the first position of the first piston rod 11 and the second position of the second piston rod 12 to coincide with the first preset position, that is, when the first piston rod 11 and the second piston rod 12 are both in the optimal extension position of the piston rod, that is, when the first piston rod 11 and the second piston rod 12 squeeze the oil in the first rod chamber 7 and the second rod chamber 8 into the connecting chamber 9 and introduce it into the oil tank 10 through the electromagnetic reversing valve 4, the processor can start the reset operation.

[0057] In one embodiment, the solenoid directional valve is controlled to be in the second working position, so that the first working port, the second working port, and the third working port of the solenoid directional valve are all closed; the closed pump is controlled to replenish oil to the first rodless chamber or the second rodless chamber, so that the piston rod of the first pumping cylinder or the second pumping cylinder extends; when the replenishment displacement of the closed pump reaches the preset displacement, the solenoid directional valve is controlled to be in the third working position, so that the first working port of the solenoid directional valve is connected to the second working port; when the first position or the second position coincides with the second preset position, the closed pump is controlled to be in standby mode, and the solenoid directional valve is controlled to be in the second working position.

[0058] After the processor determines, via the first displacement sensor 13 and the second displacement sensor 14, that both the first position of the first piston rod 11 and the second position of the second piston rod 12 coincide with the first preset position, the processor can control the solenoid directional valve to be in the second working position, thereby closing all working ports of the solenoid directional valve 4. The processor can then control the closed-loop pump 1 to replenish oil to either the first rodless chamber 5 or the second rodless chamber 6, causing the first piston rod 11 of the first pumping cylinder 2 or the second piston rod 12 of the second pumping cylinder 3 to extend. When the replenishment displacement of the closed pump 1 reaches the preset displacement, the processor can control the solenoid directional valve 4 to be in the third working position, so that the first working port A of the solenoid directional valve 4 is connected to the second working port P. That is, the oil source and the connecting chamber 9 are connected through the first working port A and the second working port P. The oil can be introduced from the oil source into the connecting chamber 9 through the second working port P and the first working port A of the solenoid directional valve 4, and then enter the rod chamber of the pumping cylinder through the connecting chamber 9, thereby squeezing the piston rod to the retracted state. The processor can set a second preset position, which can be set by the operator according to the optimal retracted position. When the processor determines, via the first displacement sensor 13 or the second displacement sensor 14, that the first position of the first piston rod 11 or the second position of the second piston rod 12 coincides with the second preset position, that is, when the oil replenishment of the closed pump 1 allows the first piston rod 11 or the second piston rod 12 to remain in the extended state, the oil entering the rod chamber from the oil source can only squeeze the other piston rod that is not in the extended state. Therefore, when the position of the first piston rod 11 or the second piston rod 12 coincides with the second preset position set by the processor, the processor can control the closed pump to be in standby mode and control the solenoid directional valve 4 to be in the second working position, so that the hydraulic system enters the standby working state.

[0059] In one embodiment, the hydraulic system further includes a first position detection device and a second position detection device. The first position detection device is used to detect whether the first piston rod of the first pumping cylinder has reached the position of the first position detection device, and the second position detection device is used to detect whether the second piston rod of the second pumping cylinder has reached the position of the second position detection device. The control method further includes: after controlling the closed pump to be in standby mode, acquiring the first detection signals sent by the first position detection device and the second position detection device respectively, the first detection signals indicating that both the first position detection device and the second position detection device have detected the piston rod; and initiating a reset operation according to the first detection signals.

[0060] like Figure 4The hydraulic system shown also includes a first position detection device 15 and a second position detection device 16. The first position detection device 15 is used to detect whether the first piston rod 11 of the first pumping cylinder 2 has reached the position of the first position detection device 15, and the second position detection device 16 is used to detect whether the second piston rod 12 of the second pumping cylinder 3 has reached the position of the second position detection device 16. After the processor controls the closed pump 1 to be in standby mode, the processor can obtain the first detection signals of the first position detection device 15 and the second position detection device 16 respectively, wherein the first detection signal indicates that both the first position detection device 15 and the second position detection device 16 have detected the piston rod. The first detection device 15 and the second position detection device 16 can be used as follows: Figure 4 As shown, it can be installed at the optimal extension position that the piston rod can reach. Therefore, when the first detection device 15 and the second position detection device 16 detect the piston rod, it proves that both the first piston rod and the second piston rod have reached the optimal extension position. At this time, the oil in the rod chamber has been squeezed into the connecting chamber 9 through the piston rod. The processor can start the reset operation according to the first detection signal to make the hydraulic system enter the ready working state.

[0061] In one embodiment, the hydraulic system further includes a third position detection device and a fourth position detection device. The third position detection device is used to detect whether the first piston rod has reached the position of the third position detection device, and the fourth position detection device is used to detect whether the second piston rod has reached the position of the fourth position detection device. The start-up reset operation includes: controlling the solenoid directional valve to the second working position so that the first working port, the second working port, and the third working port of the solenoid directional valve are all closed; controlling the closed pump to replenish oil to the first rodless chamber or the second rodless chamber so that the piston rod of the first pumping cylinder or the second pumping cylinder extends; when the replenishment displacement of the closed pump reaches the preset displacement, controlling the solenoid directional valve to the third working position so that the first working port and the second working port of the solenoid directional valve are connected; acquiring a second detection signal sent by the third position detection device or the fourth position detection device, the second detection signal indicating that the third position detection device or the fourth position detection device has detected the piston rod; controlling the closed pump to the standby state according to the second detection signal, and controlling the solenoid directional valve to the second working position.

[0062] like Figure 4 The hydraulic system shown also includes a third position detection device 17 and a fourth position detection device 18. The third position detection device 17 is used to detect whether the first piston rod 11 of the first pumping cylinder 2 has reached the position of the third position detection device 17, and the fourth position detection device 18 is used to detect whether the second piston rod 12 of the second pumping cylinder 3 has reached the position of the fourth position detection device 18. The third position detection device 17 and the fourth position detection device 18 can be used as follows: Figure 4As shown, it can be installed at the optimal retracted position that the piston rod can reach.

[0063] After the processor receives the first detection signal from the first position detection device 15 and the second position detection device 16, it can control the solenoid directional valve 4 to be in the second working position to close all working ports of the solenoid directional valve 4. The processor can control the closed pump 1 to replenish oil to the first rodless chamber 5 or the second rodless chamber 6, so that the first piston rod 11 of the first pumping cylinder 2 or the second piston rod 12 of the second pumping cylinder 3 extends. When the replenishment displacement of the closed-loop pump 1 reaches the preset displacement, the processor can control the solenoid directional valve 4 to be in the third working position, so that the first working port A of the solenoid directional valve 4 is connected to the second working port P. That is, the oil source and the connecting chamber 9 are connected through the first working port A and the second working port P. The oil can be introduced from the oil source into the connecting chamber 9 through the second working port P and the first working port A of the solenoid directional valve 4, and then enter the rod chamber of the pumping cylinder through the connecting chamber 9, thereby squeezing the piston rod to the retracted state. Because the replenishment of the closed-loop pump 1 allows the first piston rod 11 or the second piston rod 12 to remain in the extended state, the oil entering the rod chamber from the oil source can only squeeze the other piston rod that is not in the extended state. Since the third position detection device 17 and the fourth position detection device 18 are installed at the positions corresponding to the optimal retracted state of the piston rod, when the processor receives a second detection signal from the third position detection device 17 or the fourth position detection device 18 that indicates that the piston rod has been detected, the processor can control the closed pump to be in standby mode and control the solenoid directional valve to be in the second working position according to the second detection signal.

[0064] In one embodiment, a processor is provided, configured to perform any of the above-described control methods for a hydraulic system.

[0065] like Figure 5 The diagram illustrates a flowchart of a control method for a hydraulic system according to an embodiment of this application, including the following steps:

[0066] Step 501: Upon receiving an oil displacement signal, control the solenoid directional valve to be in the first working position so that the first working port of the solenoid directional valve is connected to the third working port.

[0067] Step 502: Control the closed pump to standby mode, so that the oil pressure at the outlet of the closed pump is equal, so that the oil in the first rod chamber and the oil in the second rod chamber are introduced into the oil tank through the connecting chamber and the solenoid reversing valve.

[0068] Step 503: When it is determined that the first position of the first piston rod and the second position of the second piston rod coincide with the first preset position, the electromagnetic reversing valve is controlled to be in the second working position so that the first working port, the second working port and the third working port of the electromagnetic reversing valve are all closed.

[0069] Step 504: Control the closed pump to replenish oil to the first rodless chamber or the second rodless chamber so that the piston rod of the first pumping cylinder or the second pumping cylinder extends.

[0070] Step 505: When the replenishment oil discharge of the closed pump reaches the preset discharge, control the solenoid directional valve to be in the third working position so that the first working oil port of the solenoid directional valve is connected to the second working oil port.

[0071] Step 506: When it is determined that the first position of the first piston rod or the second position of the second piston rod coincides with the second preset position, the closed pump is controlled to be in standby mode, and the solenoid directional valve is controlled to be in the second working position.

[0072] Upon receiving an oil displacement signal, the processor can control the solenoid directional valve to its first operating position. In this position, the first and third working ports of the solenoid directional valve are connected, allowing the connecting chamber to be connected to the oil tank via these ports. The processor can also control the closed-loop pump to be in standby mode. When in standby mode, the closed-loop pump provides equal pressure to either the inlet of the first rodless chamber or the inlet of the second rodless chamber. This causes the first piston rod in the first closed-loop pump and the second piston rod in the second closed-loop pump to extend, thereby squeezing the oil in the first and second rod chambers into the connecting chamber. The oil in the first and second rod chambers then flows through the connecting chamber and into the oil tank via the first and third working ports connected in the solenoid directional valve.

[0073] After the processor controls the closed-loop pump to be in standby mode, the processor can obtain the first position of the first piston rod and the second position of the second piston rod. The processor can set the optimal extension position of the piston rod as the first preset position. When the pressure provided by the closed-loop pump to the first and second rodless chambers in standby mode causes the first position of the first piston rod and the second position of the second piston rod to coincide with the first preset position, that is, when both the first and second piston rods are in the optimal extension position, the processor can control the solenoid directional valve to be in the second working position, so that the first working port, the second working port, and the third working port of the solenoid directional valve are all closed.

[0074] The processor can control the closed-loop pump to replenish oil to the first rodless chamber or the second rodless chamber, so that the first piston rod of the first pumping cylinder extends or the second piston rod of the second pumping cylinder remains extended. When the replenishment displacement of the closed-loop pump reaches a preset displacement, the processor can control the solenoid directional valve to the third working position, so that the oil source and the connecting chamber are connected through the first working port and the second working port. Oil can be introduced from the oil source through the second working port and the first working port of the solenoid directional valve into the connecting chamber, and then enter the rod chamber of the pumping cylinder through the connecting chamber, thereby squeezing the piston rod that is not in the extended state to the retracted state. The processor can set a second preset position, which can be set by the operator according to the optimal retracted position. When the processor determines that the first position of the first piston rod or the second position of the second piston rod coincides with the second preset position, the processor can control the closed-loop pump to the standby state and control the solenoid directional valve to the second working position, so that the hydraulic system enters the standby state.

[0075] The above technical solution eliminates the U-shaped tube connecting the rod chamber and rodless chamber in existing technologies. Instead, it connects the connecting chamber between the first and second rod chambers to a solenoid directional valve. By controlling the operating state of the closed-loop pump and the working position of the solenoid directional valve, the piston rod forces the oil in the rod chamber to the oil tank. The oil in the rod chamber is then replenished by an oil source, thus completing the replacement of the oil in the rod chamber. This minimizes the risk of oil from the pumping environment entering the pumping cylinder and prevents oil exchange between the rod and rodless chambers, reducing the risk of moisture and impurities entering the pumping system. Furthermore, by detecting the piston position with a sensor, the piston can be made to force the oil in the rod chamber to the oil tank as much as possible, further replacing the oil in the rod chamber.

[0076] In one embodiment, such as Figure 6The diagram shows a structural diagram of a hydraulic system, which includes: a closed-loop pump 1; a first pumping cylinder 2, including a first rodless chamber 5, a first rod chamber 7, and a first piston rod 11, the first rodless chamber 5 being connected to the closed-loop pump 1; a second pumping cylinder 3, including a second rodless chamber 6, a second rod chamber 8, and a second piston rod 12, the second rodless chamber 6 being connected to the closed-loop pump 1, and the first rod chamber 7 and the second rod chamber 8 being connected via a connecting chamber 9; a piston rod detection device 19 for detecting the position of the piston rod; and an electromagnetic directional valve 4, including a first working port A connected to the connecting chamber 9, a second working port P connected to an oil source, and a third working port T connected to an oil tank 10. A processor (not shown) is electrically connected to the piston rod detection device 19 and the electromagnetic directional valve 4. The processor is configured to control the electromagnetic directional valve 4 to switch and control the working state of the closed-loop pump 1 upon receiving an oil displacement signal; and to adjust the working position of the electromagnetic directional valve 4 and the working state of the closed-loop pump 1 according to the position of the piston rod.

[0077] In one embodiment, as described above Figure 3 As shown, the piston rod detection device 19 may include a first displacement sensor 13, installed in the first pumping cylinder 2, for obtaining the first position of the first piston rod 11; and a second displacement sensor 14, installed in the second pumping cylinder 3, for obtaining the second position of the second piston rod 12.

[0078] In one embodiment, as described above Figure 4 As shown, the piston rod detection device 19 may include a first position detection device 15 for detecting whether the first piston rod 11 has reached the position of the first position detection device 15; a second position detection device 16 for detecting whether the second piston rod 12 has reached the position of the second position detection device 16; a third position detection device 17 for detecting whether the first piston rod 11 has reached the position of the third position detection device 17; and a fourth position detection device 18 for detecting whether the second piston rod 12 has reached the position of the fourth position detection device 18.

[0079] In one embodiment, such as Figure 7 As shown, based on Figure 6 The hydraulic system shown also includes a check valve 20, whose inlet is connected to an oil source and whose outlet is connected to a second working port P, to prevent oil from flowing back from the solenoid directional valve 4 to the oil source; and a water suction filter 21, whose inlet is connected to a third working port T and whose outlet is connected to the oil tank 10. The water suction filter 21 has a water suction function and can also filter impurities in the oil, thereby removing water and impurities from the oil introduced into the oil tank 10. Therefore, the water suction filter 21 can be used to clean the oil introduced into the oil tank 10.

[0080] In one embodiment, such as Figure 7 As shown, the hydraulic system may also include a concrete piston cleaning water tank 22. The oil inlet of the concrete piston cleaning water tank 22 is connected to the third working oil port T. The oil in the connecting cavity 9 can enter the concrete piston cleaning water tank 22 through the third working oil port T of the electromagnetic reversing valve 4 for cleaning and lubrication of the concrete piston (not shown in the figure).

[0081] The above technical solution eliminates the U-shaped tube connecting the rod chamber and the rodless chamber in the prior art. Instead, it connects the connecting chamber, which links the first rod chamber and the second rod chamber, to a solenoid directional valve. A piston detection device installed in the pumping cylinder detects the position of the piston rod, allowing the oil in the rod chamber to be forced out by the piston rod, thus replacing the oil in the rod chamber. This ensures that the hydraulic system only replaces the oil in the rod chamber, avoiding oil exchange between the rod chamber and the rodless chamber, and reducing the risk of moisture and impurities entering the pumping system.

[0082] The memory may include non-permanent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0083] In one embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as follows: Figure 8 As shown. The computer device includes a processor A01, a network interface A02, a memory (not shown), and a database (not shown) connected via a system bus. The processor A01 provides computing and control capabilities. The memory includes internal memory A03 and a non-volatile storage medium A04. The non-volatile storage medium A04 stores an operating system B01, a computer program B02, and a database (not shown). The internal memory A03 provides an environment for the operation of the operating system B01 and the computer program B02 stored in the non-volatile storage medium A04. The database stores relevant data about the engineering machinery and data input by the operators. The network interface A02 communicates with external terminals via a network connection. When the computer program B02 is executed by the processor A01, it implements a control method for a hydraulic system.

[0084] Figure 1 This is a flowchart illustrating a control method for a hydraulic system in one embodiment. It should be understood that, although... Figure 1The steps in the flowchart are shown sequentially as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order in which these steps are executed, and they can be performed in other orders. Figure 1 At least some of the steps in the process may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least some of the sub-steps or stages of other steps.

[0085] This application provides an embodiment of a device, which includes a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, it performs the following steps: upon receiving an oil displacement signal, it controls the solenoid directional valve to be in a first working position, so that the first working port of the solenoid directional valve is connected to the third working port; it controls the closed pump to be in a standby state, so that the oil pressure at the outlet of the closed pump is equal, so that the oil in the first rod chamber and the oil in the second rod chamber are introduced into the oil tank through the connecting chamber and the solenoid directional valve; and it initiates a reset operation to put the hydraulic system into a ready-to-work state.

[0086] In one embodiment, initiating a reset operation to put the hydraulic system into a ready-to-work state includes: when the closed-loop pump has been in standby mode for a first preset duration, controlling the solenoid directional valve to a second working position, so that the first working port, second working port, and third working port of the solenoid directional valve are all closed; controlling the closed-loop pump to replenish oil to the first rodless chamber or the second rodless chamber, so that the piston rod of the first pumping cylinder or the second pumping cylinder extends; when the replenishment displacement of the closed-loop pump reaches a preset displacement, controlling the solenoid directional valve to a third working position, so that the first working port and the second working port are connected; when the solenoid directional valve has been in the third working position for a second preset duration, controlling the solenoid directional valve to a second working position, so that the hydraulic system enters a ready-to-work state.

[0087] In one embodiment, the hydraulic system further includes a first displacement sensor and a second displacement sensor. The first displacement sensor is installed in the first pumping cylinder, and the second displacement sensor is installed in the second pumping cylinder. The control method further includes: after controlling the closed pump to be in standby mode, obtaining the first position of the first piston rod of the first pumping cylinder and the second position of the second piston rod of the second pumping cylinder through the first displacement sensor and the second displacement sensor respectively; and initiating a reset operation when it is determined that the first position and the second position coincide with the first preset position.

[0088] In one embodiment, the reset operation includes: controlling the solenoid directional valve to a second working position, so that the first working port, the second working port, and the third working port of the solenoid directional valve are all closed; controlling the closed-loop pump to replenish oil to the first rodless chamber or the second rodless chamber, so that the piston rod of the first pumping cylinder or the second pumping cylinder extends; when the replenishment displacement of the closed-loop pump reaches a preset displacement, controlling the solenoid directional valve to a third working position, so that the first working port of the solenoid directional valve is connected to the second working port; when the first position or the second position coincides with the second preset position, controlling the closed-loop pump to a standby state, and controlling the solenoid directional valve to a second working position.

[0089] In one embodiment, the hydraulic system further includes a first position detection device and a second position detection device. The first position detection device is used to detect whether the first piston rod of the first pumping cylinder has reached the position of the first position detection device, and the second position detection device is used to detect whether the second piston rod of the second pumping cylinder has reached the position of the second position detection device. The control method further includes: after controlling the closed pump to be in standby mode, acquiring the first detection signals sent by the first position detection device and the second position detection device respectively, the first detection signals indicating that both the first position detection device and the second position detection device have detected the piston rod; and initiating a reset operation according to the first detection signals.

[0090] In one embodiment, the hydraulic system further includes a third position detection device and a fourth position detection device. The third position detection device is used to detect whether the first piston rod has reached the position of the third position detection device, and the fourth position detection device is used to detect whether the second piston rod has reached the position of the fourth position detection device. The start-up reset operation includes: controlling the solenoid directional valve to the second working position so that the first working port, the second working port, and the third working port of the solenoid directional valve are all closed; controlling the closed pump to replenish oil to the first rodless chamber or the second rodless chamber so that the piston rod of the first pumping cylinder or the second pumping cylinder extends; when the replenishment displacement of the closed pump reaches the preset displacement, controlling the solenoid directional valve to the third working position so that the first working port and the second working port of the solenoid directional valve are connected; acquiring a second detection signal sent by the third position detection device or the fourth position detection device, the second detection signal indicating that the third position detection device or the fourth position detection device has detected the piston rod; controlling the closed pump to the standby state according to the second detection signal, and controlling the solenoid directional valve to the second working position.

[0091] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0092] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create a machine for implementing the flowchart illustrations. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0093] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0094] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0095] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0096] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0097] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0098] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0099] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A control method for a hydraulic system, characterized by, The hydraulic system includes a closed-loop pump, a first pumping cylinder, a second pumping cylinder, and a solenoid directional valve. The closed-loop pump is connected to the first rodless chamber of the first pumping cylinder and the second rodless chamber of the second pumping cylinder, respectively. The first rod chamber of the first pumping cylinder and the second rod chamber of the second pumping cylinder are connected via a connecting chamber. The solenoid directional valve includes a first working port communicating with the connecting chamber, a second working port communicating with an oil source, and a third working port communicating with an oil tank. The control method includes: Upon receiving an oil displacement signal, the electromagnetic directional valve is controlled to be in the first working position so that the first working port of the electromagnetic directional valve is connected to the third working port. The closed-loop pump is controlled to be in standby mode, so that the oil pressure at the outlet of the closed-loop pump is equal, so that the oil in the first rod chamber and the oil in the second rod chamber are introduced into the oil tank through the connecting chamber and the electromagnetic reversing valve. When the closed pump is in standby mode for a period of time that reaches the first preset time, the electromagnetic reversing valve is controlled to be in the second working position so that the first working port, the second working port and the third working port of the electromagnetic reversing valve are all closed. The closed pump is controlled to replenish oil to the first rodless chamber or the second rodless chamber, so that the piston rod of the first pumping cylinder or the second pumping cylinder extends. When the replenishment oil discharge of the closed pump reaches the preset discharge, the electromagnetic reversing valve is controlled to be in the third working position so that the first working oil port is connected to the second working oil port. When the electromagnetic directional valve is in the third working position for a period of time that reaches the second preset time, the electromagnetic directional valve is controlled to be in the second working position so that the hydraulic system enters the ready-to-work state. Wherein, controlling the electromagnetic reversing valve to the third working position when the replenishment oil discharge of the closed pump reaches the preset discharge volume, so as to connect the first working oil port and the second working oil port, includes: When the replenishment oil displacement of the closed pump reaches the preset displacement, the electromagnetic reversing valve is controlled to be in the third working position so that the first working oil port is connected to the second working oil port, and the piston rod of the pumping cylinder that has not performed the piston rod extension is in the optimal retracted state. The oil between the first rodless chamber and the first rod chamber of the first pumping cylinder does not exchange, and the oil between the second rodless chamber and the second rod chamber of the second pumping cylinder does not exchange.

2. The control method for a hydraulic system according to claim 1, characterized by, The hydraulic system further includes a first displacement sensor and a second displacement sensor, the first displacement sensor being installed in the first pumping cylinder and the second displacement sensor being installed in the second pumping cylinder. The control method further includes: After the closed pump is put into standby mode, the first position of the first piston rod of the first pumping cylinder and the second position of the second piston rod of the second pumping cylinder are obtained by the first displacement sensor and the second displacement sensor, respectively. If it is determined that the first position and the second position coincide with the first preset position, a reset operation is initiated.

3. The control method for a hydraulic system according to claim 2, characterized in that, The startup reset operation includes: The electromagnetic reversing valve is controlled to be in the second working position so that the first working port, the second working port and the third working port of the electromagnetic reversing valve are all closed. The closed pump is controlled to replenish oil to the first rodless chamber or the second rodless chamber, so that the piston rod of the first pumping cylinder or the second pumping cylinder extends. When the replenishment oil discharge of the closed pump reaches the preset discharge, the electromagnetic reversing valve is controlled to be in the third working position so that the first working oil port of the electromagnetic reversing valve is connected to the second working oil port. When the first position or the second position coincides with the second preset position, the closed pump is controlled to be in standby mode, and the electromagnetic reversing valve is controlled to be in the second working position.

4. The control method for a hydraulic system according to claim 1, characterized in that, The hydraulic system further includes a first position detection device and a second position detection device. The first position detection device is used to detect whether the first piston rod of the first pumping cylinder has reached the position of the first position detection device. The second position detection device is used to detect whether the second piston rod of the second pumping cylinder has reached the position of the second position detection device. The control method further includes: After the closed pump is put into standby mode, the first detection signal sent by the first position detection device and the second position detection device is acquired respectively. The first detection signal indicates that both the first position detection device and the second position detection device have detected the piston rod. A reset operation is initiated based on the first detection signal.

5. The control method for a hydraulic system according to claim 4, characterized in that, The hydraulic system further includes a third position detection device and a fourth position detection device. The third position detection device is used to detect whether the first piston rod has reached the position where the third position detection device is located, and the fourth position detection device is used to detect whether the second piston rod has reached the position where the fourth position detection device is located. The start-up reset operation includes: The electromagnetic reversing valve is controlled to be in the second working position so that the first working port, the second working port and the third working port of the electromagnetic reversing valve are all closed. The closed pump is controlled to replenish oil to the first rodless chamber or the second rodless chamber, so that the piston rod of the first pumping cylinder or the second pumping cylinder extends. When the replenishment oil discharge of the closed pump reaches the preset discharge, the electromagnetic reversing valve is controlled to be in the third working position so that the first working oil port of the electromagnetic reversing valve is connected to the second working oil port. Acquire a second detection signal sent by the third position detection device or the fourth position detection device, the second detection signal indicating that the third position detection device or the fourth position detection device has detected the piston rod; The closed-loop pump is controlled to be in standby mode according to the second detection signal, and the electromagnetic reversing valve is controlled to be in the second working position.

6. A processor, characterized in that, It is configured to perform the control method for a hydraulic system according to any one of claims 1 to 5.

7. A control device for a hydraulic system, characterized in that, Includes the processor as described in claim 6.

8. A hydraulic system, characterized in that, The hydraulic system includes: Closed-loop pump; The first pumping cylinder includes a first rodless chamber, a first rod chamber, and a first piston rod, wherein the first rodless chamber is connected to the closed pump. The second pumping cylinder includes a second rodless chamber, a second rod chamber, and a second piston rod. The second rodless chamber is connected to the closed pump, and the first rod chamber and the second rod chamber are connected through a connecting chamber. Piston rod detection device, used to detect the position of piston rod; The electromagnetic reversing valve includes a first working oil port connected to the communicating cavity, a second working oil port connected to an oil source, and a third working oil port connected to an oil tank. The processor, electrically connected to the piston rod detection device and the solenoid directional valve, is configured to: Upon receiving an oil displacement signal, the electromagnetic directional valve is controlled to be in the first working position so that the first working port of the electromagnetic directional valve is connected to the third working port. The closed-loop pump is controlled to be in standby mode, so that the oil pressure at the outlet of the closed-loop pump is equal, so that the oil in the first rod chamber and the oil in the second rod chamber are introduced into the oil tank through the connecting chamber and the electromagnetic reversing valve. When the closed pump is in standby mode for a period of time that reaches the first preset time, the electromagnetic reversing valve is controlled to be in the second working position so that the first working port, the second working port and the third working port of the electromagnetic reversing valve are all closed. The closed pump is controlled to replenish oil to the first rodless chamber or the second rodless chamber, so that the piston rod of the first pumping cylinder or the second pumping cylinder extends. When the replenishment oil discharge of the closed pump reaches the preset discharge, the electromagnetic reversing valve is controlled to be in the third working position so that the first working oil port is connected to the second working oil port. When the electromagnetic directional valve is in the third working position for a period of time that reaches the second preset time, the electromagnetic directional valve is controlled to be in the second working position so that the hydraulic system enters the ready-to-work state. Wherein, controlling the electromagnetic reversing valve to the third working position when the replenishment oil discharge of the closed pump reaches the preset discharge volume, so as to connect the first working oil port and the second working oil port, includes: When the replenishment oil displacement of the closed pump reaches the preset displacement, the electromagnetic reversing valve is controlled to be in the third working position so that the first working oil port is connected to the second working oil port, and the piston rod of the pumping cylinder that has not performed the piston rod extension is in the optimal retracted state. In the aforementioned hydraulic system, the oil between the first rodless chamber and the first rod chamber of the first pumping cylinder does not exchange, and the oil between the second rodless chamber and the second rod chamber of the second pumping cylinder does not exchange.

9. The hydraulic system according to claim 8, characterized in that, The piston rod detection device includes: A first displacement sensor is installed in the first pumping cylinder to obtain the first position of the first piston rod. The second displacement sensor is installed in the second pumping cylinder to obtain the second position of the second piston rod.

10. The hydraulic system according to claim 8, characterized in that, The piston rod detection device includes: A first position detection device is used to detect whether the first piston rod has reached the position where the first position detection device is located. The second position detection device is used to detect whether the second piston rod has reached the position where the second position detection device is located; A third position detection device is used to detect whether the first piston rod has reached the position where the third position detection device is located. A fourth position detection device is used to detect whether the second piston rod has reached the position where the fourth position detection device is located.

11. The hydraulic system according to claim 8, characterized in that, The hydraulic system also includes: A one-way valve, wherein the oil inlet of the one-way valve is connected to the oil source and the oil outlet of the one-way valve is connected to the second working oil port, is used to prevent oil from flowing back from the solenoid directional valve to the oil source; A water-absorbing filter, wherein the oil inlet of the water-absorbing filter is connected to the third working oil port and the oil outlet of the water-absorbing filter is connected to the oil tank, is used to clean the oil introduced into the oil tank.

12. A machine-readable storage medium storing instructions thereon, characterized in that, When executed by a processor, this instruction causes the processor to be configured to perform the control method for a hydraulic system according to any one of claims 1 to 5.

Images