Pumping hydraulic system

Abstract

The application relates to the field of engineering machinery, in particular to a pumping hydraulic system. The pumping hydraulic system comprises a closed pump, a first pumping cylinder comprising a first rodless cavity, a first rod cavity and a first piston rod, the first rodless cavity being communicated with the closed pump; a second pumping cylinder comprising a second rodless cavity, a second rod cavity and a second piston rod, the second rodless cavity being communicated with the closed pump, the first rod cavity being connected with the second rod cavity through a communication cavity; a pressure relief device connected with the first rodless cavity and the second rodless cavity respectively; and a controller electrically connected with the pressure relief device and the closed pump and configured to: according to the position of the first piston rod or the second piston rod, make the first rodless cavity and the second rodless cavity conduct or disconnect through controlling the pressure relief device, and adjust the working state of the closed pump. The first pumping cylinder or the second pumping cylinder is relieved, so that the piston rod is buffered, and violent collision between the piston rod and the bottom of the pumping cylinder is avoided.

Description

Technical Field

[0001] This application relates to the field of engineering machinery, and more specifically, to a pumping hydraulic system. Background Technology

[0002] Current concrete pumping equipment uses two pumping cylinders connected in series to drive the reciprocating motion of the concrete piston, realizing 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.

[0003] In existing technology, a U-shaped tube is installed at the rodless end of the pumping cylinder. A one-way valve and a ball valve are mounted on the U-shaped tube. When the piston retracts and moves between the two oil ports connecting the U-shaped tube and the cylinder, the oil in the rod chamber of the pumping cylinder communicates with the rodless chamber through the U-shaped tube, allowing the oil in the rod chamber to be depressurized and preventing violent collision between the piston and the bottom of the pumping cylinder. However, each time the piston passes through the U-shaped tube, the oil in the rod chamber exchanges with the oil in the rodless chamber, leading to the entry of moisture and impurities into the system. Furthermore, the flow capacity of the U-shaped tube is limited, and pressure cannot be controlled during buffering. In the event of a collision, the system will experience a significant pressure shock. Summary of the Invention

[0004] The purpose of this application is to provide a pumping hydraulic system that relieves pressure and buffers the pumping cylinder and prevents moisture and impurities from entering the pumping system.

[0005] To achieve the above objectives, this application provides a pumping hydraulic system, which includes:

[0006] Closed-loop pump;

[0007] 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.

[0008] 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.

[0009] The pressure relief device is connected to the first rodless chamber and the second rodless chamber respectively;

[0010] The controller, electrically connected to the pressure relief device and the closed-loop pump, is configured as follows:

[0011] When the first piston rod of the first pumping cylinder or the second piston rod of the second pumping cylinder reaches the preset position, the oil discharge rate of the closed pump is reduced.

[0012] The pressure relief device connects the first rodless chamber and the second rodless chamber to relieve pressure on the first pumping cylinder or the second pumping cylinder.

[0013] When the oil displacement decreases to zero, the closed pump is controlled to reverse and the oil displacement of the closed pump is controlled to increase to the preset displacement.

[0014] When the duration of communication between the first rodless chamber and the second rodless chamber reaches a first preset duration, the pressure relief device controls the disconnection of the first rodless chamber and the second rodless chamber to stop the pressure relief of the first pumping cylinder or the second pumping cylinder.

[0015] In embodiments of this application, the pressure relief device includes: a two-way cartridge valve, including a first working port communicating with a first rodless chamber and a second working port communicating with a second rodless chamber; the controller is further configured to: control the pressure relief device to communicate the first rodless chamber and the second rodless chamber by: controlling the first working port to communicate with the second working port to relieve pressure on the first pumping cylinder or the second pumping cylinder; control the pressure relief device to disconnect the first rodless chamber and the second rodless chamber by: controlling the first working port to disconnect with the second working port to stop relieving pressure on the first pumping cylinder or the second pumping cylinder.

[0016] In embodiments of this application, the pumping hydraulic system further includes: an oil source for providing oil; an oil tank for storing oil; a first solenoid directional valve including a third working port connected to a two-way cartridge valve, a fourth working port connected to the oil source, and a fifth working port connected to the oil tank; the controller is configured to: control the connection between the first working port and the second working port of the two-way cartridge valve by: controlling the connection between the third working port and the fifth working port, so that the oil in the two-way cartridge valve is introduced into the oil tank through the first solenoid directional valve to connect the first working port and the second working port; control the disconnection between the first working port and the second working port by: controlling the connection between the third working port and the fourth working port, so that the oil is introduced from the oil source into the two-way cartridge valve to disconnect the first working port and the second working port.

[0017] In embodiments of this application, an oil source is used to provide oil; an oil tank is used to store oil; a second solenoid directional valve includes a first inlet communicating with a two-way cartridge valve and the oil source, and a first outlet communicating with a second inlet communicating with a relief valve; the relief valve includes a second inlet communicating with the first outlet communicating with the oil tank; the control is configured to: control the first working oil port of the two-way cartridge valve to communicate with the second working oil port, including: controlling the first inlet to communicate with the first outlet, so that the oil in the two-way cartridge valve flows through the second solenoid directional valve and the relief valve into the oil tank, so that the first working oil port communicates with the second working oil port; control the first working oil port to disconnect from the second working oil port, including: controlling the first inlet to disconnect from the first outlet, so that the oil is introduced into the two-way cartridge valve through the oil source, so that the first working oil port disconnects from the second working oil port.

[0018] In the embodiments of this application, an oil source is used to provide oil; an oil tank is used to store oil; a first proportional relief valve includes a third inlet connected to the two-way cartridge valve and the oil source, and a third outlet connected to the oil tank; the controller is configured to: control the connection between the first working oil port and the second working oil port of the two-way cartridge valve by: controlling the pressure of the first proportional relief valve at a first preset pressure, so that the oil in the two-way cartridge valve is introduced into the oil tank through the first proportional relief valve, thereby connecting the first working oil port and the second working oil port; control the disconnection between the first working oil port and the second working oil port of the two-way cartridge valve by: controlling the pressure of the first proportional relief valve at a second preset pressure, so that the oil in the two-way cartridge valve cannot be introduced into the oil tank through the first proportional relief valve, thereby disconnecting the first working oil port and the second working oil port, wherein the second preset pressure is greater than the first preset pressure.

[0019] In an embodiment of this application, a first pressure sensor is used to detect the pumping pressure of a closed-loop pump; the controller is configured to: acquire the pumping pressure of the closed-loop pump through the first pressure sensor; and determine a first preset pressure of a first proportional relief valve based on the pumping pressure.

[0020] In embodiments of this application, the second proportional relief valve includes a fourth inlet communicating with the first rodless chamber and a fourth outlet communicating with the third proportional relief valve; the third proportional relief valve includes a fifth inlet communicating with the second rodless chamber and a fifth outlet communicating with the second proportional relief valve; the first check valve includes a sixth inlet communicating with the fourth outlet and a sixth outlet communicating with the fourth outlet; the second check valve includes a seventh inlet communicating with the fifth outlet and a seventh outlet communicating with the fifth outlet; the controller is further configured to: control the pressure relief device. Connecting the first rodless chamber to the second rodless chamber includes: controlling the fourth oil inlet to connect to the fourth oil outlet, so that the oil passes through the second proportional relief valve and the second check valve; or controlling the fifth oil inlet to connect to the fifth oil outlet, so that the oil passes through the third proportional relief valve and the first check valve to depressurize the first pumping cylinder or the second pumping cylinder; controlling the depressurization device to disconnect the first rodless chamber from the second rodless chamber includes: controlling the fourth oil inlet to disconnect from the fourth oil outlet, or controlling the fifth oil inlet to disconnect from the fifth oil outlet, so as to stop depressurizing the first pumping cylinder or the second pumping cylinder.

[0021] In embodiments of this application, the pumping hydraulic system further includes: a second pressure sensor for detecting the pumping pressure of the closed-loop pump; the controller is further configured to: acquire the pumping pressure of the closed-loop pump through the second pressure sensor; determine a third preset pressure of the second proportional relief valve based on the pumping pressure, so that when the pressure of the oil in the first rodless chamber reaches the third preset pressure, it flows through the second proportional relief valve and the second check valve to communicate with the second rodless chamber; and determine a fourth preset pressure of the third proportional relief valve based on the pumping pressure.

[0022] When the pressure of the oil in the second rodless chamber reaches the fourth preset pressure, it flows through the third proportional relief valve and the first check valve to connect with the first rodless chamber.

[0023] In embodiments of this application, the controller is further configured to control the discharge rate of the closed pump to decrease after a second preset time period.

[0024] In embodiments of this application, the controller is further configured to: control the pressure relief device to connect the first rodless chamber and the second rodless chamber after a third preset time period.

[0025] The above technical solution involves installing a pressure relief device between the first rodless chamber of the first pumping cylinder and the second rodless chamber of the second pumping cylinder. A controller manages the discharge rate of the closed-loop pump and connects the first and second rodless chambers via the pressure relief device, thereby relieving pressure on either the first or second pumping cylinder. This buffers the piston rod, preventing violent collisions between the piston rod and the bottom of the pumping cylinder, and also prevents the oil in the rodless chamber from exchanging with the oil in the rod chamber, thus avoiding impurities entering the pumping hydraulic system.

[0026] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0027] 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:

[0028] Figure 1 This illustration schematically shows the structure of a pumping hydraulic system in one embodiment of this application. Figure 1 ;

[0029] Figure 2 A flowchart illustrating a control method for a pumping hydraulic system in one embodiment of this application is shown schematically.

[0030] Figure 3 This illustration schematically shows the structure of a pumping hydraulic system in one embodiment of this application. Figure 2 ;

[0031] Figure 4 This illustration schematically shows the structure of a pumping hydraulic system in one embodiment of this application. Figure 3 ;

[0032] Figure 5 This illustration schematically shows the structure of a pumping hydraulic system in one embodiment of this application. Figure 4 ;

[0033] Figure 6This illustration schematically shows the structure of a pumping hydraulic system in one embodiment of this application. Figure 5 .

[0034] Explanation of reference numerals in the attached figures

[0035] 1. Closed-loop pump; 2. First pumping cylinder; 3. First rodless chamber; 4. First rod chamber; 5. First piston rod; 6. Second pumping cylinder; 7. Second rodless chamber; 8. Second rod chamber; 9. Second piston rod; 10. Connecting chamber; 11. Pressure relief device; 12. Two-way cartridge valve; 13. Oil tank; 14. First solenoid directional valve; 15. Second solenoid directional valve; 16. Relief valve; 17. First proportional relief valve; 18. First pressure sensor; 19. Second proportional relief valve; 20. Third proportional relief valve; 21. First 21. Check valve; 22. Second check valve; 23. Second pressure sensor; A. First working port; B. Second working port; C. Third working port; P. Fourth working port; T. Fifth working port; D. First inlet port; E. Second inlet port; F. First outlet port; G. Second outlet port; H. Third inlet port; I. Third outlet port; J. Fourth inlet port; K. Fourth outlet port; L. Fifth inlet port; M. Fifth outlet port; N. Sixth inlet port; O. Sixth outlet port; Q. Seventh inlet port; R. Seventh outlet port. Detailed Implementation

[0036] 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.

[0037] 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 the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0038] 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.

[0039] like Figure 1The diagram illustrates, schematically, the structural structure of the pumping hydraulic system in an embodiment of this application. Figure 1 As shown, the pumping hydraulic system includes a closed-loop pump 1; a first pumping cylinder 2, including a first rodless chamber 3, a first rod chamber 4, and a first piston rod 5, the first rodless chamber 3 being connected to the closed-loop pump 1; a second pumping cylinder 6, including a second rodless chamber 7, a second rod chamber 8, and a second piston rod 9, the second rodless chamber 7 being connected to the closed-loop pump 1, and the first rod chamber 4 and the second rod chamber 8 being connected through a connecting chamber 10; and a pressure relief device 11, connected to the first rodless chamber 3 and the second rodless chamber 7 respectively. A controller (not shown in the figure) is electrically connected to the pressure relief device 11 and the closed-loop pump 1.

[0040] like Figure 2 As shown, schematically illustrating Figure 1 A flowchart of a control method for a pumping hydraulic system, configured to be executed by the controller, is shown below. Figure 2 As shown, it includes the following steps:

[0041] Step 201: When the first piston rod of the first pumping cylinder or the second piston rod of the second pumping cylinder reaches the preset position, control the oil discharge of the closed pump to decrease.

[0042] Step 202: Control the pressure relief device to connect the first rodless chamber and the second rodless chamber to relieve pressure on the first pumping cylinder or the second pumping cylinder.

[0043] Step 203: When the oil displacement is reduced to zero, control the closed pump to reverse and control the oil displacement of the closed pump to increase to the preset displacement.

[0044] Step 204: When the duration of communication between the first rodless chamber and the second rodless chamber reaches a first preset duration, the pressure relief device is controlled to disconnect the first rodless chamber from the second rodless chamber to stop the pressure relief of the first pumping cylinder or the second pumping cylinder.

[0045] When the controller determines that the first piston rod 5 of the first pumping cylinder 2 or the second piston rod 9 of the second pumping cylinder 6 has reached a preset position, the controller can reduce the oil displacement of the closed-loop pump 1. The preset position can be set by the operator according to different working conditions. When the piston rod reaches the preset position, it means the piston rod is about to collide with the cylinder; therefore, the controller reduces the oil displacement of the closed-loop pump to reduce the pressure inside the pumping cylinder. The controller controls the pressure relief device 11 to connect the first rodless chamber 2 and the second rodless chamber 7 to relieve pressure on the first pumping cylinder 2 and the second pumping cylinder 6. When the controller determines that the oil displacement of the closed-loop pump 1 has decreased to zero, the controller can reverse the direction of the closed-loop pump 1 and increase the oil displacement of the closed-loop pump 1 to the preset displacement set by the controller. Furthermore, since the pumping cylinder only needs to be depressurized when the piston in the pumping cylinder is about to collide with the cylinder, and does not need to be depressurized at other times, when the controller determines that the duration for which the depressurization device 11 connects the first rodless chamber 2 and the second rodless chamber 7 reaches the first preset duration set by the controller, the controller can control the depressurization device 11 to disconnect the first rodless chamber 2 and the second rodless chamber 7, so as to stop depressurizing the first pumping cylinder 2 or the second pumping cylinder 6.

[0046] In one embodiment, such as Figure 3 The pressure relief device shown includes a two-way cartridge valve 12, comprising a first working port A communicating with the first rodless chamber 3 and a second working port B communicating with the second rodless chamber 7. The controller is further configured to: control the pressure relief device to connect the first rodless chamber 3 and the second rodless chamber 7 by controlling the first working port A and the second working port B to relieve pressure on the first pumping cylinder 2 or the second pumping cylinder 6; and control the pressure relief device to disconnect the first rodless chamber 3 and the second rodless chamber 7 by controlling the first working port A and the second working port B to stop relieving pressure on the first pumping cylinder 2 or the second pumping cylinder 6.

[0047] like Figure 3 As shown, the pressure relief device may include a two-way cartridge valve 12. The first working port A of the two-way cartridge valve 12 is connected to the first rodless chamber 3, and the second working port B is connected to the second rodless chamber 7. The controller can control the connection between the first working port A and the second working port B of the two-way cartridge valve 12, thereby connecting the first rodless chamber 3 and the second rodless chamber 7 to relieve pressure on the first pumping cylinder 2 and the second pumping cylinder 6. The controller can also control the disconnection between the first working port A and the second working port B of the two-way cartridge valve 12, thereby disconnecting the first rodless chamber 3 and the second rodless chamber 7 to stop relieving pressure on the first pumping cylinder 2 and the second pumping cylinder 6.

[0048] In one embodiment, such as Figure 3As shown, the pumping hydraulic system also includes: an oil source for supplying oil; an oil tank 13 for storing oil; a first solenoid directional valve 14, including a third working port C connected to a two-way cartridge valve 12, a fourth working port P connected to the oil source, and a fifth working port T connected to the oil tank 13; the controller is configured to: control the connection between the first working port A and the second working port B of the two-way cartridge valve 12 by controlling the connection between the third working port C and the fifth working port T, so that the oil in the two-way cartridge valve 12 is introduced into the oil tank 10 through the first solenoid directional valve 14 to connect the first working port A and the second working port B; control the disconnection between the first working port A and the second working port B by controlling the connection between the third working port C and the fourth working port P, so that the oil is introduced from the oil source into the two-way cartridge valve 12 to disconnect the first working port A and the second working port B.

[0049] like Figure 3 As shown, the third working port C of the first solenoid directional valve 14 is connected to the two-way cartridge valve 12, the fourth working port P is connected to the oil source, and the fifth working port T is connected to the oil tank 13. When the controller needs to control the connection between the first working port A and the second working port B of the two-way cartridge valve, the controller can control the connection between the third working port C and the fifth working port T of the first solenoid directional valve 14, so that the oil in the two-way cartridge valve 12 is introduced into the oil tank 13 through the third working port C and the fifth working port T of the first solenoid directional valve 14, thereby connecting the first working port A and the second working port B of the two-way cartridge valve 12, thereby connecting the first rodless chamber 3 and the second rodless chamber 7, so as to relieve pressure on the first pumping cylinder 2 and the second pumping cylinder 6. When the controller needs to disconnect the first working port A from the second working port B, the processor can control the third working port C and the fourth working port P of the first solenoid valve 14 to connect, so that the oil is introduced from the oil source through the third working port C and the fourth working port P of the first solenoid valve 14 into the two-way cartridge valve 12, thereby disconnecting the first working port A from the second working port B of the two-way cartridge valve 12, thereby disconnecting the first rodless chamber 3 from the second rodless chamber 7, so as to stop depressurizing the first pumping cylinder 2 and the second pumping cylinder 6.

[0050] In one embodiment, such as Figure 4As shown, the pumping hydraulic system also includes: an oil source for supplying hydraulic fluid; an oil tank 13 for storing hydraulic fluid; a second solenoid directional valve 15, including a first inlet D connected to the two-way cartridge valve 12 and the oil source, and a first outlet F connected to the second inlet E of the relief valve 16; the relief valve 16, including a second inlet E connected to the first outlet F, and a second outlet G connected to the oil tank 13; the control is configured to: control the first working port A of the two-way cartridge valve 12 and the second working port G. Connecting oil port B includes: controlling the first oil inlet D to connect with the first oil outlet F, so that the oil in the two-way cartridge valve 12 flows through the second solenoid directional valve 15 and the overflow valve 16 into the oil tank 13, so that the first working oil port A and the second working oil port B are connected; controlling the first working oil port A and the second working oil port B to disconnect includes: controlling the first oil inlet D to disconnect with the first oil outlet F, so that the oil is introduced into the two-way cartridge valve 12 through the oil source, so that the first working oil port A and the second working oil port B are disconnected.

[0051] like Figure 4 As shown, the first inlet D of the second solenoid directional valve 15 is connected to the two-way cartridge valve 12 and the oil source, and the first outlet F is connected to the second inlet E of the relief valve 16. The second inlet E of the relief valve 16 is connected to the first outlet F of the second solenoid directional valve 15, and the second outlet G is connected to the oil tank 13. The pressure of the relief valve 16 can be adjusted and confirmed by the operator according to the operating conditions of the pumping hydraulic system. When the controller needs to connect the first working port A and the second working port B of the two-way cartridge valve, the controller can connect the first inlet D and the first outlet F of the second solenoid directional valve 15, so that the oil in the two-way cartridge valve 12 is introduced into the relief valve 16 through the first inlet D and the first outlet F of the second solenoid directional valve 15. After the oil pressure reaches the pressure of the relief valve 16, the oil can be introduced into the oil tank 13 through the relief valve 16, thereby connecting the first working port A and the second working port B of the two-way cartridge valve 12, so that the first rodless chamber 3 and the second rodless chamber 7 are connected, so as to relieve the pressure of the first pumping cylinder 2 and the second pumping cylinder 6. In other words, when the first oil inlet D and the first oil outlet F of the second electromagnetic directional valve 15 are connected, and the oil pressure between the first rodless chamber 3 of the first pumping cylinder 2 and the second rodless chamber 7 of the second pumping cylinder 6 is greater than or equal to that of the overflow valve 16, the second oil inlet E and the second oil outlet G of the overflow valve 16 will be connected, allowing the oil in the two-way cartridge valve 12 to enter the oil tank 13 through the second electromagnetic directional valve 15 and the overflow valve 16, thereby connecting the first rodless chamber 3 and the second rodless chamber 7 to relieve pressure on the first pumping cylinder 2 and the second pumping cylinder 6.

[0052] When the controller needs to disconnect the first working port A and the second working port B of the two-way cartridge valve, the controller can disconnect the first inlet port D and the first outlet port F of the second solenoid directional valve 15 so that oil is introduced from the oil source into the two-way cartridge valve 12, thereby disconnecting the first working port A and the second working port B of the two-way cartridge valve 12, so that the first rodless chamber 3 and the second rodless chamber 7 are disconnected, so as to stop the pressure relief of the first pumping cylinder 2 and the second pumping cylinder 6.

[0053] In one embodiment, such as Figure 5 As shown, the pumping hydraulic system further includes: an oil source for supplying oil; an oil tank 13 for storing oil; a first proportional relief valve 17, including a third inlet H connected to the two-way cartridge valve 12 and the oil source, and a third outlet I connected to the oil tank 13; the controller is configured to: control the connection between the first working port A and the second working port B of the two-way cartridge valve 12 by: controlling the pressure of the first proportional relief valve 17 at a first preset pressure, so that the oil in the two-way cartridge valve 12 is introduced into the oil tank 13 through the first proportional relief valve 17, thus connecting the first working port A and the second working port B; control the disconnection between the first working port A and the second working port B of the two-way cartridge valve 12 by: controlling the pressure of the first proportional relief valve 17 at a second preset pressure, so that the oil in the two-way cartridge valve 12 cannot be introduced into the oil tank 13 through the first proportional relief valve 17, thus disconnecting the first working port A and the second working port B, wherein the second preset pressure is greater than the first preset pressure.

[0054] like Figure 5 As shown, the third inlet H of the first proportional relief valve 17 is connected to the two-way cartridge valve 12 and the oil source, and the third outlet I is connected to the oil tank 13. The controller can control the pressure of the first proportional relief valve 17 to be at the first preset pressure set by the controller, so that the oil in the two-way cartridge valve 12 can be introduced into the oil tank 13 through the third inlet H and the third outlet I of the first proportional relief valve 17, thereby connecting the first working port A and the second working port B of the two-way cartridge valve 12, so that the first rodless chamber 3 and the second rodless chamber 7 are connected, so as to relieve the pressure on the first pumping cylinder 2 and the second pumping cylinder 6. The controller can also control the pressure of the first proportional relief valve 17 to be at a second preset pressure, wherein the second preset pressure is greater than the first preset pressure, so that the oil in the two-way cartridge valve 12 cannot be introduced into the oil tank 13 through the first proportional relief valve 17, thereby disconnecting the first working port A and the second working port B of the two-way cartridge valve 12, so that the first rodless chamber 3 and the second rodless chamber 7 are disconnected, so as to stop the pressure relief of the first pumping cylinder 2 and the second pumping cylinder 6.

[0055] In one embodiment, such as Figure 5As shown, the pumping hydraulic system also includes: a first pressure sensor 18 for detecting the pumping pressure of the closed pump 1; the controller is configured to: acquire the pumping pressure of the closed pump 1 through the first pressure sensor 18; and determine the first preset pressure of the first proportional relief valve 17 based on the pumping pressure.

[0056] like Figure 5 As shown, the pumping hydraulic system may also include a first pressure sensor 18, which can be used to detect the pumping pressure of the closed pump 1. The controller can be electrically connected to the first pressure sensor 18. After obtaining the pumping pressure of the closed pump 1 through the first pressure sensor 18, the controller determines the first preset pressure of the first proportional relief valve 17 based on the pumping pressure of the closed pump 1, thereby setting the pressure of the first proportional relief valve 17 to relieve pressure on the pumping cylinder.

[0057] In one embodiment, such as Figure 6 As shown, the pressure relief device includes: a second proportional relief valve 19, including a fourth oil inlet J communicating with the first rodless chamber 3 and a fourth oil outlet K communicating with the third proportional relief valve 20; a third proportional relief valve 20, including a fifth oil inlet L communicating with the second rodless chamber 7 and a fifth oil outlet M communicating with the second proportional relief valve 19; a first check valve 21, including a sixth oil inlet N communicating with the fourth oil outlet K and a sixth oil outlet O communicating with the fourth oil inlet J; a second check valve 22, including a seventh oil inlet Q communicating with the fifth oil outlet M and a seventh oil outlet R communicating with the fifth oil inlet L; the controller is further configured to: control pressure relief. The device connects the first rodless chamber 3 and the second rodless chamber 7 by: controlling the fourth oil inlet J to connect the fourth oil outlet K, so that the oil passes through the second proportional relief valve 19 and the second check valve 22; or controlling the fifth oil inlet L to connect the fifth oil outlet M, so that the oil passes through the third proportional relief valve 20 and the first check valve 21 to depressurize the first pumping cylinder 2 or the second pumping cylinder 6; the device controls the depressurization device to disconnect the first rodless chamber 3 and the second rodless chamber 7 by: controlling the fourth oil inlet J to disconnect the fourth oil outlet K, or controlling the fifth oil inlet L to disconnect the fifth oil outlet M, so as to stop depressurizing the first pumping cylinder 2 or the second pumping cylinder 6.

[0058] like Figure 6As shown, the pressure relief device may include a second proportional relief valve 19, a third proportional relief valve 20, a first check valve 21, and a second check valve 22. The fourth inlet J of the second proportional relief valve 19 is connected to the first rodless chamber of the first pumping cylinder 2; the fifth inlet L of the third proportional relief valve 20 is connected to the second rodless chamber 7 of the second pumping cylinder 6; and the fourth outlet K of the second proportional relief valve 19 is connected to the fifth outlet M of the third proportional relief valve 20. The sixth inlet N of the first check valve 21 is connected to the fourth outlet K of the second proportional relief valve 19; the sixth outlet O of the first check valve 21 is connected to the fourth inlet J of the second proportional relief valve 19; the seventh inlet Q of the second check valve 22 is connected to the fifth outlet M of the third proportional relief valve 20; and the seventh outlet R of the second check valve 22 is connected to the fifth inlet L of the third proportional relief valve 20.

[0059] The controller can set the pressure of the second proportional relief valve 19. When the pressure of the oil in the first rodless chamber 3 is greater than or equal to the pressure of the second proportional relief valve 19, the fourth inlet J and the fourth outlet K of the second proportional relief valve 19 are connected. The oil in the first rodless chamber 3 can flow through the seventh inlet Q and the seventh outlet R of the second proportional relief valve 19 and the second check valve 22 to connect with the second rodless chamber 7, thereby relieving pressure on the first pumping cylinder 2 or the second pumping cylinder 6. The controller can also set the pressure of the third proportional relief valve 20. When the pressure of the oil in the second rodless chamber 7 is greater than or equal to the pressure of the third proportional relief valve 20, the fifth inlet L and the fifth outlet M of the third proportional relief valve 20 are connected. The oil in the second rodless chamber 7 can flow through the sixth inlet N and the sixth outlet O of the third proportional relief valve 20 and the first check valve 21 to connect with the first rodless chamber 3, thereby relieving pressure on the first pumping cylinder 2 or the second pumping cylinder 6.

[0060] The controller can also disconnect the fourth oil inlet J of the second proportional relief valve 19 from the fourth oil outlet K, or disconnect the fifth oil inlet L from the fifth oil outlet M of the third proportional relief valve 20, by setting the pressure of the second proportional relief valve 19 or the third proportional relief valve 20, so as to stop depressurizing the first pumping cylinder 2 or the second pumping cylinder 6.

[0061] In one embodiment, such as Figure 6As shown, the pumping hydraulic system also includes: a second pressure sensor 23 for detecting the pumping pressure of the closed pump 1; the controller is further configured to: acquire the pumping pressure of the closed pump 1 through the second pressure sensor 23; determine a third preset pressure of the second proportional relief valve 19 based on the pumping pressure, so that when the pressure of the oil in the first rodless chamber 3 reaches the third preset pressure, it flows through the second proportional relief valve 19 and the second check valve 22 to communicate with the second rodless chamber 7; determine a fourth preset pressure of the third proportional relief valve 20 based on the pumping pressure; when the pressure of the oil in the second rodless chamber 7 reaches the fourth preset pressure, it flows through the third proportional relief valve 20 and the first check valve 21 to communicate with the first rodless chamber 3.

[0062] The controller can obtain the pumping pressure of the closed pump 1 through the second pressure sensor 23 to determine the third preset pressure of the second proportional relief valve 19 and the fourth preset pressure of the third proportional relief valve 20. The controller can adjust the pressure of the second proportional relief valve 19 to the third preset pressure, so that the oil in the first rodless chamber 3 can flow through the second proportional relief valve 19 and the second check valve 22 to connect with the second rodless chamber 7, thereby relieving pressure on the first pumping cylinder 2 or the second pumping cylinder 6. The controller can also adjust the pressure of the third proportional relief valve 20 to the fourth preset pressure, so that the oil in the second rodless chamber 7 can flow through the third proportional relief valve 20 and the first check valve 21 to connect with the first rodless chamber 3, thereby relieving pressure on the first pumping cylinder 2 or the second pumping cylinder 6.

[0063] In one embodiment, the controller is further configured to control the discharge rate of the closed pump to decrease after a second preset time period.

[0064] When the controller determines that the first piston rod of the first pumping cylinder or the second piston rod of the second pumping cylinder has reached a preset position, the controller can control the displacement of the closed pump to decrease after a second preset time period. The second preset time period can be set by the operator according to the operating conditions of the pumping hydraulic system.

[0065] In one embodiment, the controller is further configured to control the pressure relief device to connect the first rodless chamber to the second rodless chamber after a third preset time period.

[0066] When the controller determines that the first piston rod of the first pumping cylinder or the second piston rod of the second pumping cylinder has reached the preset position, it can control the pressure relief device to connect the first rodless chamber and the second rodless chamber after a third preset time period to relieve pressure on the first pumping cylinder or the second pumping cylinder. The third preset time period can be set by the operator according to the working conditions of the pumping hydraulic system.

[0067] The above technical solution involves installing a pressure relief device between the first rodless chamber of the first pumping cylinder and the second rodless chamber of the second pumping cylinder. A controller manages the discharge rate of the closed-loop pump and connects the first and second rodless chambers via the pressure relief device to relieve pressure on either the first or second pumping cylinder. This buffers the piston rod, preventing violent collisions between the piston rod and the bottom of the pumping cylinder, and also prevents oil exchange between the rodless and rod chambers, thus avoiding impurities entering the pumping hydraulic system. Furthermore, the pumping hydraulic system can use a two-way cartridge valve to connect or disconnect the first and second rodless chambers, thereby relieving or stopping pressure relief on the pumping cylinder. In this application, the two-way cartridge valve can be controlled by an electromagnetic directional valve or a relief valve, allowing for more precise control of the connection and disconnection between the first and second rodless chambers to relieve or stop pressure relief on the pumping cylinder. Furthermore, the pressure relief device can be connected in series with multiple proportional relief valves and check valves. The pressure of the proportional relief valves can be adjusted according to the pumping pressure of the closed pump, so that when the pressure of the rodless chamber reaches the pressure set by the proportional relief valve, the rodless chambers can be connected to relieve pressure.

[0068] 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.

[0069] Figure 2 This is a flowchart illustrating the control method of the controller pair for the pumping hydraulic system in one embodiment. It should be understood that, although... Figure 2 The 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 2 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.

[0070] 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.

[0071] 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 and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0072] 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.

[0073] 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.

[0074] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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 pumping hydraulic system, characterized in that, The pumping 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. The pressure relief device is connected to the first rodless chamber and the second rodless chamber respectively; The controller, electrically connected to the pressure relief device and the closed-loop pump, is configured to: When the first piston rod of the first pumping cylinder or the second piston rod of the second pumping cylinder reaches a preset position, the oil discharge rate of the closed pump is controlled to decrease. The pressure relief device is controlled to connect the first rodless chamber and the second rodless chamber to relieve pressure on the first pumping cylinder or the second pumping cylinder. When the oil discharge rate decreases to zero, the closed-loop pump is controlled to reverse, and the oil discharge rate of the closed-loop pump is controlled to increase to a preset discharge rate. When the duration of communication between the first rodless chamber and the second rodless chamber reaches a first preset duration, the pressure relief device is controlled to disconnect the first rodless chamber from the second rodless chamber in order to stop the pressure relief of the first pumping cylinder or the second pumping cylinder. The pressure relief device further includes: A two-way cartridge valve includes a first working port communicating with the first rodless chamber and a second working port communicating with the second rodless chamber. The controller is also configured to: Controlling the pressure relief device to connect the first rodless chamber and the second rodless chamber includes: Control the connection between the first working oil port and the second working oil port to depressurize the first pumping cylinder or the second pumping cylinder; Controlling the pressure relief device to disconnect the first rodless chamber from the second rodless chamber includes: Disconnect the first working oil port from the second working oil port to stop depressurizing the first pumping cylinder or the second pumping cylinder; Alternatively, the pressure relief device may further include: a second proportional relief valve, comprising a fourth oil inlet communicating with the first rodless chamber and a fourth oil outlet communicating with the third proportional relief valve; The third proportional relief valve includes a fifth oil inlet communicating with the second rodless chamber and a fifth oil outlet communicating with the second proportional relief valve. The first check valve includes a sixth inlet connected to the fourth outlet and a sixth outlet connected to the fourth outlet. The second check valve includes a seventh inlet connected to the fifth outlet and a seventh outlet connected to the fifth inlet. The controller is also configured to: Controlling the pressure relief device to connect the first rodless chamber and the second rodless chamber includes: Controlling the fourth oil inlet to connect with the fourth oil outlet allows the oil to pass through the second proportional overflow valve and the second check valve; or The fifth oil inlet is connected to the fifth oil outlet, so that the oil passes through the third proportional overflow valve and the first check valve to depressurize the first pumping cylinder or the second pumping cylinder. Controlling the pressure relief device to disconnect the first rodless chamber from the second rodless chamber includes: Disconnect the fourth oil inlet from the fourth oil outlet, or disconnect the fifth oil inlet from the fifth oil outlet, to stop depressurizing the first pumping cylinder or the second pumping cylinder.

2. The pumping hydraulic system according to claim 1, characterized in that, The pumping hydraulic system also includes: Oil source, used to provide oil fluid; Fuel tanks are used to store oil. The first electromagnetic reversing valve includes a third working port connected to the two-way cartridge valve, a fourth working port connected to the oil source, and a fifth working port connected to the oil tank. The controller is configured to: Controlling the connection between the first working port and the second working port of the two-way cartridge valve includes: Control the third working oil port to connect with the fifth working oil port, so that the oil in the two-way cartridge valve is introduced into the oil tank through the first electromagnetic reversing valve so that the first working oil port is connected with the second working oil port; Controlling the disconnection between the first working oil port and the second working oil port includes: The third working port is connected to the fourth working port so that the oil is introduced from the oil source into the two-way cartridge valve so that the first working port is disconnected from the second working port.

3. The pumping hydraulic system according to claim 1, characterized in that, The pumping hydraulic system also includes: Oil source, used to provide oil fluid; Fuel tanks are used to store oil. The second electromagnetic reversing valve includes a first oil inlet connected to the two-way cartridge valve and the oil source, and a first oil outlet connected to the second oil inlet of the overflow valve. The overflow valve includes a second oil inlet connected to the first oil outlet and a second oil outlet connected to the oil tank; The control is configured as follows: Controlling the connection between the first working port and the second working port of the two-way cartridge valve includes: Control the first oil inlet and the first oil outlet to connect so that the oil in the two-way cartridge valve flows through the second solenoid directional valve and the overflow valve into the oil tank, so that the first working oil port and the second working oil port are connected. Controlling the disconnection between the first working oil port and the second working oil port includes: The first oil inlet is disconnected from the first oil outlet so that oil is introduced into the two-way cartridge valve through the oil source, thereby disconnecting the first working oil port from the second working oil port.

4. The pumping hydraulic system according to claim 1, characterized in that, The pumping hydraulic system also includes: Oil source, used to provide oil fluid; Fuel tanks are used to store oil. The first proportional relief valve includes a third oil inlet connected to the two-way cartridge valve and the oil source, and a third oil outlet connected to the oil tank. The controller is configured to: Controlling the connection between the first working port and the second working port of the two-way cartridge valve includes: The pressure of the first proportional relief valve is controlled at a first preset pressure so that the oil in the two-way cartridge valve is introduced into the oil tank through the first proportional relief valve, so that the first working oil port is connected to the second working oil port. Controlling the disconnection between the first working port and the second working port of the two-way cartridge valve includes: The pressure of the first proportional relief valve is controlled at a second preset pressure so that the oil in the two-way cartridge valve cannot be introduced into the oil tank through the first proportional relief valve, thereby disconnecting the first working oil port from the second working oil port, wherein the second preset pressure is greater than the first preset pressure.

5. The pumping hydraulic system according to claim 4, characterized in that, The pumping hydraulic system also includes: A first pressure sensor is used to detect the pumping pressure of the closed-loop pump; The controller is configured to: The pumping pressure of the closed pump is obtained through the first pressure sensor; The first preset pressure of the first proportional relief valve is determined based on the pumping pressure.

6. The pumping hydraulic system according to claim 1, characterized in that, When the pressure relief device further includes the second proportional relief valve, the pumping hydraulic system further includes: The second pressure sensor is used to detect the pumping pressure of the closed pump; The controller is also configured to: The pumping pressure of the closed pump is obtained through the second pressure sensor; The third preset pressure of the second proportional relief valve is determined based on the pumping pressure, so that when the pressure of the oil in the first rodless chamber reaches the third preset pressure, it flows through the second proportional relief valve and the second check valve to communicate with the second rodless chamber. The fourth preset pressure of the third proportional relief valve is determined based on the pumping pressure. When the pressure of the oil in the second rodless chamber reaches the fourth preset pressure, it flows through the third proportional relief valve and the first check valve to communicate with the first rodless chamber.

7. The pumping hydraulic system according to any one of claims 1-6, characterized in that, The controller is also configured to: After a second preset time period, the discharge rate of the closed pump is reduced.

8. The pumping hydraulic system according to any one of claims 1-6, characterized in that, The controller is also configured to: After a third preset time period, the pressure relief device is controlled to connect the first rodless chamber and the second rodless chamber.

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