A hydraulic pump operating mode switching device and switching method

Abstract

The present application belongs to the field of hydraulic pump control, and particularly relates to a hydraulic pump working mode switching device and a switching method. The device comprises a first damping hole, a second damping hole, a first one-way valve, a second one-way valve, an electromagnetic reversing valve, a valve block and a remote pressure control valve. The power-on state of the electromagnetic electromagnet can switch the load-sensitive pump between the idle mode, the remote pressure control mode and the constant pressure mode. The present application can transform the load-sensitive control mode of the hydraulic pump station into the remote pressure control mode by designing a hydraulic pump working mode switching device, and can switch the hydraulic pump between the idle mode, the remote pressure control mode and the constant pressure mode. The switching can be controlled by electricity or manually, thereby improving the versatility and reliability of the hydraulic pump and the pump station and saving the cost of equipment.

Description

Technical Field

[0001] This invention belongs to the field of hydraulic pump control, and specifically relates to a hydraulic pump working mode switching device and switching method. Background Technology

[0002] The hydraulic pump is the core power component of a hydraulic system. Its main function is to convert mechanical energy (such as the rotational kinetic energy of an electric motor or engine) into the pressure energy of a liquid, thereby providing a power source for the hydraulic system. It achieves the intake and discharge of liquid by periodically changing the volume of a sealed working chamber, forming pressurized oil to drive hydraulic actuators (such as hydraulic cylinders and hydraulic motors).

[0003] Hydraulic pumps can be classified into open-loop pumps and closed-loop pumps based on the circuit type of the hydraulic system; they can also be classified into gear pumps, vane pumps, piston pumps, screw pumps, etc., based on their structural type; and they can be classified into fixed displacement pumps and variable displacement pumps based on their displacement adjustment method. Variable displacement pumps further include various control methods such as constant pressure control, load-sensitive control, remote pressure control, and power control. The load-sensitive pump described in this invention is an open-loop variable displacement piston pump, employing a combined load-sensitive and constant pressure control method.

[0004] The factory's existing hydraulic pump stations, if using load-sensitive pumps, can only achieve load-sensitive control or a combination of load-sensitive and constant pressure control, making them unsuitable for equipment requiring remote pressure control. If a hydraulic pump station with remote pressure control is needed, it requires redesigning and manufacturing a new one, resulting in low versatility and increased equipment costs. Furthermore, load-sensitive control and remote pressure control methods have high failure rates, and the hydraulic pump station's reliance on a single control method and inability to switch between multiple methods leads to low reliability. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a hydraulic pump working mode switching device and switching method, which transforms the existing hydraulic pump station using load-sensitive control mode into a remote pressure control mode, without the need to redesign and manufacture new hydraulic pump stations, thereby improving the versatility and reliability of hydraulic pump stations and saving equipment costs.

[0006] A hydraulic pump operating mode switching device, comprising: The system includes a first damping orifice, a second damping orifice, a first check valve, a second check valve, a solenoid directional valve, a valve block, and a remote pressure control valve. The valve block includes an internally machined oil passage and several oil ports. The first damping orifice, the second damping orifice, the first check valve, the second check valve, and the electromagnetic reversing valve are integrated on the valve block. One end of the first damping orifice is connected to the oil port M2 of the valve block, and the other end of the first damping orifice is connected to the first check valve. The connection point between the first damping orifice and the first check valve is connected to the oil port X2 of the valve block. One end of the second damping orifice is connected to the oil port M3 of the valve block, and the other end of the second damping orifice is connected to the second check valve. The connection point between the second damping orifice and the second check valve is connected to the oil port X3 of the valve block. One end of the first check valve is connected to one end of the second check valve, and the connection point of the first check valve and the second check valve is connected to the solenoid directional valve. One end of the electromagnetic reversing valve is connected to the oil port A of the valve block, and the other end of the electromagnetic reversing valve is connected to the oil port T of the valve block. The valve block's oil ports M2 and X2 are connected to the first load-sensitive pump, the valve block's oil ports M3 and X3 are connected to the second load-sensitive pump, the valve block's oil port A is connected to the remote pressure control valve, and the valve block's oil port T is connected to the oil tank.

[0007] Optionally, the first load-sensitive pump includes a first load-sensitive valve, a first constant pressure valve, and a first variable cylinder; The oil outlet B2 of the first load-sensitive pump is connected to the oil port B2 of the hydraulic system, the oil outlet pressure measuring point M2 of the first load-sensitive pump is connected to the oil port M2 of the valve block, and the control oil port X2 of the first load-sensitive pump is connected to the oil port X2 of the valve block. The left side of the first load-sensitive valve is connected to the oil outlet B2 of the first load-sensitive pump, the right side of the first load-sensitive valve is connected to the control oil port X2 of the first load-sensitive pump, and the three oil ports of the first load-sensitive valve are respectively connected to the oil outlet B2 of the first load-sensitive pump, the housing of the first load-sensitive pump, and the first constant pressure valve. The left side of the first constant pressure valve is connected to the oil outlet B2 of the first load sensitive pump, and the three oil ports of the first constant pressure valve are respectively connected to the oil outlet B2 of the first load sensitive pump, the first load sensitive valve, and the first variable cylinder. One end of the first variable cylinder is connected to one end of the first constant pressure valve, and the first variable cylinder is connected to the variable swashplate of the first load-sensitive pump through an internal mechanical structure.

[0008] Optionally, the second load-sensitive pump includes a second load-sensitive valve, a second constant pressure valve, and a second variable cylinder; The outlet B3 of the second load-sensitive pump is connected to the oil port B3 of the hydraulic system, the oil port measuring point M3 of the second load-sensitive pump is connected to the oil port M3 of the valve block, and the control oil port X3 of the second load-sensitive pump is connected to the oil port X3 of the valve block. The left side of the second load-sensitive valve is connected to the oil outlet B3 of the second load-sensitive pump, the right side of the second load-sensitive valve is connected to the control oil port X3 of the second load-sensitive pump, and the three oil ports of the second load-sensitive valve are respectively connected to the oil outlet B3 of the second load-sensitive pump, the housing of the second load-sensitive pump, and the second constant pressure valve. The left side of the second constant pressure valve is connected to the oil outlet B3 of the second load sensitive pump, and the three oil ports of the second constant pressure valve are respectively connected to the oil outlet B3 of the second load sensitive pump, the second load sensitive valve, and the second variable cylinder. One end of the second variable cylinder is connected to one end of the second constant pressure valve, and the second variable cylinder is connected to the variable swashplate of the second load-sensitive pump through an internal mechanical structure.

[0009] Optionally, one end of the remote pressure control valve is connected to the oil port A of the valve block, and the other end of the remote pressure control valve is connected to the oil tank.

[0010] A hydraulic pump operating mode switching method, applied to a hydraulic pump operating mode switching structure, includes: The working mode of the hydraulic pump is set by the working position of the solenoid directional valve. The working position includes the middle working position, the right working position, and the left working position. The working position of the solenoid directional valve is controlled by the energized state of electromagnets S1 and S2 or by manual control. The first load-sensitive pump and the second load-sensitive pump include three operating modes: no-load mode, remote pressure control mode, and constant pressure mode. When the electromagnetic reversing valve is adjusted to the neutral working position, the first load-sensitive pump and the second load-sensitive pump are in no-load mode. When the electromagnetic reversing valve is adjusted to the right working position, the first load-sensitive pump and the second load-sensitive pump are in remote pressure control mode. When the electromagnetic reversing valve is adjusted to the left working position, the first load-sensitive pump and the second load-sensitive pump are in constant pressure mode.

[0011] Optionally, the electromagnetic reversing valve includes three energized states: electromagnets S1 and S2 are de-energized, electromagnet S1 is de-energized and electromagnet S2 is energized, and electromagnet S1 is energized and electromagnet S2 is de-energized. When electromagnets S1 and S2 are de-energized, the working position of the electromagnetic reversing valve is the neutral working position. When electromagnet S1 is de-energized and electromagnet S2 is energized, the working position of the electromagnetic reversing valve is the right-hand working position. When electromagnet S1 is energized and electromagnet S2 is de-energized, the working position of the electromagnetic reversing valve is the left position.

[0012] Optionally, the switching method of the electromagnetic reversing valve includes electric switching and manual switching.

[0013] A hydraulic pump operating mode switching system, comprising: The setting module is used to set the working mode of the hydraulic pump through the working position of the solenoid directional valve. The working position includes the middle working position, the right working position, and the left working position. The working position of the solenoid directional valve is controlled by the energized state of electromagnets S1 and S2 or by manual control. The first load-sensitive pump and the second load-sensitive pump include three operating modes: no-load mode, remote pressure control mode, and constant pressure mode. The first adjustment module is used to ensure that the first load-sensitive pump and the second load-sensitive pump are in no-load mode when the electromagnetic reversing valve is adjusted to the neutral working position. The second adjustment module is used to put the first load-sensitive pump and the second load-sensitive pump in remote pressure control mode when the electromagnetic reversing valve is adjusted to the right working position. The third adjustment module is used to ensure that the first load-sensitive pump and the second load-sensitive pump are in constant pressure mode when the electromagnetic reversing valve is adjusted to the left working position.

[0014] The beneficial effects of this invention are: (1) The existing hydraulic pump station using load-sensitive control mode can be transformed into a remote pressure control mode without redesigning or producing a new hydraulic pump station, thereby improving the versatility of the hydraulic pump station and saving equipment costs; (2) Enables the hydraulic pump to switch between no-load mode, remote pressure control mode and constant pressure mode. The hydraulic pump station can be used for equipment that only requires remote pressure control or equipment that only requires constant pressure control, thereby improving the versatility of the hydraulic pump station. (3) When the remote pressure control mode of the hydraulic pump fails, it can be forcibly switched to constant pressure mode to ensure that the equipment can work in an emergency and improve the reliability of the hydraulic pump station. (4) The hydraulic pump working mode can be switched electrically or manually. When the electrical control system fails, it can be operated manually to improve the reliability of the hydraulic pump station. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the working mode switching device of the present invention; Figure 2 This is a schematic diagram of the overall working structure of a hydraulic pump working mode switching device according to the present invention.

[0016] Explanation of reference numerals in the attached drawings: 1. Working mode switching device; 1.1. First damping orifice; 1.2. Second damping orifice; 1.3. First check valve; 1.4. Second check valve; 1.5. Solenoid directional valve; 1.6. Valve block; 2. First load-sensitive pump; 2.1. First load-sensitive valve; 2.2. First constant pressure valve; 2.3. First variable cylinder; 3. Second load-sensitive pump; 3.1. Second load-sensitive valve; 3.2. Second constant pressure valve; 3.3. Second variable cylinder; 4. Remote pressure control valve. Detailed Implementation

[0017] A hydraulic pump operating mode switching device 1, such as Figure 1 and Figure 2 As shown, it includes: The components include a first damping orifice 1.1, a second damping orifice 1.2, a first check valve 1.3, a second check valve 1.4, a solenoid directional valve 1.5, a valve block 1.6, and a remote pressure control valve 4. The valve block 1.6 includes an internally machined oil passage and several oil ports. The first damping hole 1.1, the second damping hole 1.2, the first check valve 1.3, the second check valve 1.4, and the solenoid directional valve 1.5 are integrated on the valve block 1.6. One end of the first damping orifice 1.1 is connected to the oil port M2 of the valve block 1.6, and the other end of the first damping orifice 1.1 is connected to the first check valve 1.3. The connection point between the first damping orifice 1.1 and the first check valve 1.3 is connected to the oil port X2 of the valve block 1.6. One end of the second damping orifice 1.2 is connected to the oil port M3 of the valve block 1.6, and the other end of the second damping orifice 1.2 is connected to the second check valve 1.4. The connection point between the second damping orifice 1.2 and the second check valve 1.4 is connected to the oil port X3 of the valve block 1.6. One end of the first check valve 1.3 is connected to one end of the second check valve 1.4, and the connection point of the first check valve 1.3 and the second check valve 1.4 is connected to the solenoid directional valve 1.5. One end of the solenoid directional valve 1.5 is connected to the oil port A of the valve block 1.6, and the other end of the solenoid directional valve 1.5 is connected to the oil port T of the valve block 1.6. The oil ports M2 and X2 of valve block 1.6 are connected to the first load-sensitive pump 2, the oil ports M3 and X3 of valve block 1.6 are connected to the second load-sensitive pump 3, the oil port A of valve block 1.6 is connected to the remote pressure control valve 4 in the hydraulic system, and the oil port T of valve block 1.6 is connected to the oil tank.

[0018] Specifically, the first damping orifice 1.1, the second damping orifice 1.2, the first one-way valve 1.3, the second one-way valve 1.4, the electromagnetic reversing valve 1.5, and the valve block 1.6 together constitute the working mode switching device 1.

[0019] The first load-sensitive pump 2 includes a first load-sensitive valve 2.1, a first constant pressure valve 2.2, and a first variable cylinder 2.3.

[0020] The oil outlet B2 of the first load-sensitive pump 2 is connected to the oil port B2 of the hydraulic system, the oil outlet pressure measuring point M2 of the first load-sensitive pump 2 is connected to the oil port M2 of the valve block 1.6, and the control oil port X2 of the first load-sensitive pump 2 is connected to the oil port X2 of the valve block 1.6.

[0021] The left side of the first load-sensitive valve 2.1 is connected to the oil outlet B2 of the first load-sensitive pump 2, the right side of the first load-sensitive valve 2.1 is connected to the control oil port X2 of the first load-sensitive pump 2, and the three oil ports of the first load-sensitive valve 2.1 are respectively connected to the oil outlet B2 of the first load-sensitive pump 2, the housing of the first load-sensitive pump 2, and the first constant pressure valve 2.2.

[0022] The left side of the first constant pressure valve 2.2 is connected to the oil outlet B2 of the first load sensitive pump 2, and the three oil ports of the first constant pressure valve 2.2 are respectively connected to the oil outlet B2 of the first load sensitive pump 2, the first load sensitive valve 2.1, and the first variable cylinder 2.3.

[0023] One end of the first variable cylinder 2.3 is connected to one end of the first constant pressure valve 2.2, and the first variable cylinder 2.3 is connected to the variable swashplate of the first load-sensitive pump 2 through an internal mechanical structure. The second load-sensitive pump 3 includes a second load-sensitive valve 3.1, a second constant pressure valve 3.2, and a second variable cylinder 3.3.

[0024] The oil outlet B3 of the second load-sensitive pump 3 is connected to the oil port B3 of the hydraulic system, the oil outlet pressure measuring point M3 of the second load-sensitive pump 3 is connected to the oil port M3 of the valve block 1.6, and the control oil port X3 of the second load-sensitive pump 3 is connected to the oil port X3 of the valve block 1.6. The left side of the second load-sensitive valve 3.1 is connected to the oil outlet B3 of the second load-sensitive pump 3, the right side of the second load-sensitive valve 3.1 is connected to the control oil port X3 of the second load-sensitive pump 3, and the three oil ports of the second load-sensitive valve 3.1 are respectively connected to the oil outlet B3 of the second load-sensitive pump 3, the housing of the second load-sensitive pump 3, and the second constant pressure valve 3.2.

[0025] The left side of the second constant pressure valve 3.2 is connected to the oil outlet B3 of the second load sensitive pump 3, and the three oil ports of the second constant pressure valve 3.2 are respectively connected to the oil outlet B3 of the second load sensitive pump 3, the second load sensitive valve 3.1, and the second variable cylinder 3.3.

[0026] One end of the second variable cylinder 3.3 is connected to one end of the second constant pressure valve 3.2, and the second variable cylinder 3.3 is connected to the variable swashplate of the second load-sensitive pump 3 through an internal mechanical structure.

[0027] One end of the remote pressure control valve 4 is connected to the oil port A of the valve block 1.6, and the other end is connected to the oil tank.

[0028] A method for switching the operating mode of a hydraulic pump includes: The working mode of the hydraulic pump is set by the working position of the solenoid directional valve 1.5. The working positions include the middle working position, the right working position, and the left working position. The working mode of the solenoid directional valve 1.5 is controlled by the energization state of the solenoid S1 and the solenoid S2 or by manual control. The first load-sensitive pump 2 and the second load-sensitive pump 3 include three operating modes: no-load mode, remote pressure control mode, and constant pressure mode. When the solenoid directional valve 1.5 is adjusted to the neutral working position, the first load-sensitive pump 2 and the second load-sensitive pump 3 are in no-load mode. When the solenoid directional valve 1.5 is adjusted to the right working position, the first load-sensitive pump 2 and the second load-sensitive pump 3 are in remote pressure control mode. When the solenoid directional valve 1.5 is adjusted to the left working position, the first load-sensitive pump 2 and the second load-sensitive pump 3 are in constant pressure mode. The electromagnetic reversing valve 1.5 includes three energized states: electromagnets S1 and S2 are de-energized, electromagnet S1 is de-energized and electromagnet S2 is energized, and magnet S1 is energized and electromagnet S2 is de-energized. When electromagnets S1 and S2 are de-energized, the working position of solenoid directional valve 1.5 is the neutral position. When electromagnet S1 is de-energized and electromagnet S2 is energized, the working position of solenoid directional valve 1.5 is the right-hand working position. When electromagnet S1 is energized and electromagnet S2 is de-energized, the working position of solenoid directional valve 1.5 is the left position.

[0029] The switching methods of the solenoid directional valve 1.5 include electronic switching and manual switching.

[0030] When the electromagnetic directional valve 1.5 is in the neutral position, the first load-sensitive pump 2 and the second load-sensitive pump 3 are in no-load mode, which is suitable for hydraulic pump start-up or standby conditions. Specifically, when the solenoid directional valve 1.5 is manually or electrically switched to the neutral position: The B2 port of the first load-sensitive pump 2 is the outlet of the hydraulic pump, and the M2 port is the pressure measuring point of the hydraulic pump outlet. The M2 port of the working mode switching device 1 is connected to the M2 port of the first load-sensitive pump 2, meaning that the pressure at the M2 port of the working mode switching device 1 and the B2 port of the first load-sensitive pump 2 is the same. The pressurized oil at the M2 port of the working mode switching device 1 passes through the first damping orifice 1.1 and the first check valve 1.3, and then connects to the P port of the solenoid directional valve 1.5. When the solenoid directional valve 1.5 is in the neutral position, the four oil ports P, T, A, and B are connected, and the T port is connected to the oil tank. The pressure at the T port is "0", meaning that the pressure at the four oil ports P, T, A, and B of the solenoid directional valve 1.5 is all "0". The pressure after the first damping orifice 1.1 of the working mode switching device 1 is also "0", meaning that the pressure at the X2 port of the working mode switching device 1 is "0". The X2 port of the first load-sensitive pump 2 is connected to the X2 port of the working mode switching device 1, meaning the pressure at the X2 port of the first load-sensitive pump 2 is "0". The switching pressure of the load-sensitive valve 2.1 of the first load-sensitive pump 2 is only the right-side spring force, and the spring force setting range is generally 10-30 bar. When the pressure at the B2 port of the first load-sensitive pump 2 reaches this spring setting value, the first load-sensitive valve 2.1 actuates, and pressurized oil enters the first variable cylinder 2.3, causing the first load-sensitive pump 2 to change to a "0" displacement. At this time, the first load-sensitive pump 2 is in a low-pressure, "0" displacement condition, i.e., no-load mode.

[0031] The second load-sensitive pump 3 works on the same principle as the first load-sensitive pump 2, with both hydraulic pumps operating in no-load mode simultaneously.

[0032] When the electromagnetic directional valve 1.5 is in the right position, the first load-sensitive pump 2 and the second load-sensitive pump 3 are in remote pressure control mode, which is suitable for operating conditions where the equipment requires remote pressure control. Specifically, when the solenoid directional valve 1.5 is manually or electrically switched to the right position: The B2 port of the first load-sensitive pump 2 is the outlet of the hydraulic pump, and the M2 port is the pressure measuring point of the hydraulic pump outlet. The M2 port of the working mode switching device 1 is connected to the M2 port of the first load-sensitive pump 2, meaning that the pressure at the M2 port of the working mode switching device 1 is the same as that at the B2 port of the first load-sensitive pump 2. The pressurized oil at the M2 port of the working mode switching device 1 passes through the first damping orifice 1.1 and the first check valve 1.3, and then connects to the P port of the solenoid directional valve 1.5. When the solenoid directional valve 1.5 is in the right position, the P and A ports are connected, the B and T ports are connected, and the A port is connected to the remote pressure control valve 4. Adjusting the opening pressure of the remote pressure control valve 4 can change the pressure after the first damping orifice 1.1 of the working mode switching device 1, thereby changing the pressure at the X2 port of the working mode switching device 1. The X2 port of the first load-sensitive pump 2 is connected to the X2 port of the working mode switching device 1. Adjusting the opening pressure of the remote pressure control valve 4 changes the pressure at the X2 port of the first load-sensitive pump 2, thus changing the reversing pressure of the first load-sensitive valve 2.1 of the first load-sensitive pump 2. When the pressure at the B2 port of the first load-sensitive pump 2 is the same as the reversing pressure of the first load-sensitive valve 2.1, the first load-sensitive valve 2.1 actuates, and pressurized oil enters the first variable cylinder 2.3, reducing the displacement of the first load-sensitive pump 2 and maintaining a certain pressure. At this time, the first load-sensitive pump 2 operates under a certain displacement and pressure. The remote pressure control valve 4 can control the pump's maximum operating pressure, i.e., the remote pressure control mode.

[0033] The second load-sensitive pump 3 works on the same principle as the first load-sensitive pump 2, and both hydraulic pumps are simultaneously in remote pressure control mode.

[0034] When the electromagnetic reversing valve 1.5 is in the left position, the first load-sensitive pump 2 and the second load-sensitive pump 3 are in constant pressure mode. This is suitable for emergency use when the remote pressure control mode fails, and also suitable for equipment that requires constant pressure control. Specifically, when the solenoid directional valve 1.5 is manually or electrically switched to the left position: The B2 port of the first load-sensitive pump 2 is the outlet of the hydraulic pump, and the M2 port is the pressure measuring point of the hydraulic pump outlet. The M2 port of the working mode switching device 1 is connected to the M2 port of the first load-sensitive pump 2, meaning that the pressure at the M2 port of the working mode switching device 1 is the same as that at the B2 port of the first load-sensitive pump 2. The pressurized oil at the M2 port of the working mode switching device 1 passes through the first damping orifice 1.1 and the first check valve 1.3, and then connects to the P port of the solenoid directional valve 1.5. When the solenoid directional valve 1.5 is in the left position, the P and B ports are connected, the A and T ports are connected, and the B port is sealed. The pressure before and after the first damping orifice 1.1 is the same as the pressure at the B port of the first load-sensitive pump 2. The X2 port of the first load-sensitive pump 2 is connected to the X2 port of the working mode switching device 1, meaning that the pressure at the X2 port and the B2 port of the first load-sensitive pump 2 is the same. The switching pressure of the first load-sensitive valve 2.1 of the first load-sensitive pump 2 is equal to the combined force of the pressure at port X2 of the first load-sensitive pump 2 and the spring force of the first load-sensitive valve 2.1. That is, the switching pressure of the first load-sensitive valve 2.1 is always greater than the pressure at port B2, and the first load-sensitive valve 2.1 is in a malfunctioning state. The maximum operating pressure of the first load-sensitive pump 2 is set by the first constant pressure valve 2.2. At this time, the first load-sensitive pump 2 operates under a certain displacement and a certain pressure. The first constant pressure valve 2.2 can set the maximum operating pressure of the pump, i.e., constant pressure mode.

[0035] The second load-sensitive pump 3 works on the same principle as the first load-sensitive pump 2, with both hydraulic pumps operating in constant pressure mode simultaneously.

[0036] This application also discloses a terminal device, including a memory and a processor. The memory stores a computer program that can run on the processor. When the processor loads and executes the computer program, a hydraulic pump working mode switching method is used.

[0037] The terminal device can be a computer device such as a desktop computer, a laptop computer, or a cloud server. The terminal device includes, but is not limited to, a processor and a memory. For example, the terminal device may also include input / output devices, network access devices, and buses.

[0038] The processor can be a central processing unit (CPU). Of course, depending on the actual use, it can also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), off-the-shelf programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor, etc., and this application does not limit it.

[0039] The memory can be an internal storage unit of the terminal device, such as a hard disk or RAM of the terminal device, or an external storage device of the terminal device, such as a plug-in hard disk, smart memory card (SMC), secure digital card (SD), or flash memory card (FC) equipped on the terminal device. Furthermore, the memory can be a combination of internal storage units and external storage devices of the terminal device. The memory is used to store computer programs and other programs and data required by the terminal device. The memory can also be used to temporarily store data that has been output or will be output. This application does not limit this.

[0040] In this terminal device, a hydraulic pump working mode switching method from the above embodiments is stored in the terminal device's memory and loaded and executed on the terminal device's processor for convenient use.

[0041] This application also discloses a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, it employs a hydraulic pump operating mode switching method described in the above embodiments.

[0042] The computer program can be stored in a computer-readable medium. The computer program includes computer program code, which can be in the form of source code, object code, executable file, or certain middleware. The computer-readable medium includes any entity or device capable of carrying computer program code, recording media, USB flash drive, portable hard drive, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc. It should be noted that the computer-readable medium includes, but is not limited to, the above-mentioned components.

[0043] The above-described hydraulic pump operating mode switching method is stored in the computer-readable storage medium and loaded and executed on the processor to facilitate the storage and application of the above method.

[0044] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of protection of this application is limited to these examples; under the concept of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of one or more embodiments of this application as described above, which are not provided in detail for the sake of brevity.

[0045] One or more embodiments in this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments in this application should be included within the protection scope of this application.

Claims

1. A hydraulic pump operating mode switching device, characterized in that, include: The system includes a first damping orifice (1.1), a second damping orifice (1.2), a first check valve (1.3), a second check valve (1.4), a solenoid directional valve (1.5), a valve block (1.6), and a remote pressure control valve (4). The valve block (1.6) includes an internally machined oil passage and several oil ports. The first damping hole (1.1), the second damping hole (1.2), the first check valve (1.3), the second check valve (1.4), and the electromagnetic reversing valve (1.5) are integrated on the valve block (1.6). One end of the first damping hole (1.1) is connected to the oil port M2 of the valve block (1.6), and the other end of the first damping hole (1.1) is connected to the first check valve (1.3). The connection point between the first damping hole (1.1) and the first check valve (1.3) is connected to the oil port X2 of the valve block (1.6). One end of the second damping hole (1.2) is connected to the oil port M3 of the valve block (1.6), and the other end of the second damping hole (1.2) is connected to the second check valve (1.4). The connection point between the second damping hole (1.2) and the second check valve (1.4) is connected to the oil port X3 of the valve block (1.6). One end of the first check valve (1.3) is connected to one end of the second check valve (1.4), and the connection point of the first check valve (1.3) and the second check valve (1.4) is connected to the solenoid directional valve (1.5). One end of the electromagnetic reversing valve (1.5) is connected to the oil port A of the valve block (1.6), and the other end of the electromagnetic reversing valve (1.5) is connected to the oil port T of the valve block (1.6). The oil ports M2 and X2 of the valve block (1.6) are connected to the first load-sensitive pump (2), the oil ports M3 and X3 of the valve block (1.6) are connected to the second load-sensitive pump (3), the oil port A of the valve block (1.6) is connected to the remote pressure control valve (4) in the hydraulic system, and the oil port T of the valve block (1.6) is connected to the oil tank. The first load-sensitive pump (2) includes a first load-sensitive valve (2.1), a first constant pressure valve (2.2), and a first variable cylinder (2.3); The oil outlet B2 of the first load-sensitive pump (2) is connected to the oil port B2 of the hydraulic system, the oil outlet pressure measuring point M2 of the first load-sensitive pump (2) is connected to the oil port M2 of the valve block (1.6), and the control oil port X2 of the first load-sensitive pump (2) is connected to the oil port X2 of the valve block (1.6). The left side of the first load-sensitive valve (2.1) is connected to the oil outlet B2 of the first load-sensitive pump (2), the right side of the first load-sensitive valve (2.1) is connected to the control oil port X2 of the first load-sensitive pump (2), and the three oil ports of the first load-sensitive valve (2.1) are respectively connected to the oil outlet B2 of the first load-sensitive pump (2), the housing of the first load-sensitive pump (2), and the first constant pressure valve (2.2); The left side of the first constant pressure valve (2.2) is connected to the oil outlet B2 of the first load sensitive pump (2), and the three oil ports of the first constant pressure valve (2.2) are connected to the oil outlet B2 of the first load sensitive pump (2), the first load sensitive valve (2.1), and the first variable cylinder (2.3), respectively. One end of the first variable cylinder (2.3) is connected to one end of the first constant pressure valve (2.2), and the first variable cylinder (2.3) is connected to the variable swashplate of the first load-sensitive pump (2) through an internal mechanical structure; The second load-sensitive pump (3) includes a second load-sensitive valve (3.1), a second constant pressure valve (3.2), and a second variable cylinder (3.3); The outlet B3 of the second load-sensitive pump (3) is connected to the oil port B3 of the hydraulic system, the oil port pressure measuring point M3 of the second load-sensitive pump (3) is connected to the oil port M3 of the valve block (1.6), and the control oil port X3 of the second load-sensitive pump (3) is connected to the oil port X3 of the valve block (1.6). The left side of the second load-sensitive valve (3.1) is connected to the oil outlet B3 of the second load-sensitive pump (3), the right side of the second load-sensitive valve (3.1) is connected to the control oil port X3 of the second load-sensitive pump (3), and the three oil ports of the second load-sensitive valve (3.1) are respectively connected to the oil outlet B3 of the second load-sensitive pump (3), the housing of the second load-sensitive pump (3), and the second constant pressure valve (3.2); The left side of the second constant pressure valve (3.2) is connected to the oil outlet B3 of the second load sensitive pump (3), and the three oil ports of the second constant pressure valve (3.2) are connected to the oil outlet B3 of the second load sensitive pump (3), the second load sensitive valve (3.1), and the second variable cylinder (3.3), respectively. One end of the second variable cylinder (3.3) is connected to one end of the second constant pressure valve (3.2), and the second variable cylinder (3.3) is connected to the variable swashplate of the second load-sensitive pump (3) through an internal mechanical structure.

2. The hydraulic pump operating mode switching device as described in claim 1, characterized in that, One end of the remote pressure control valve (4) is connected to the oil port A of the valve block (1.6), and the other end of the remote pressure control valve (4) is connected to the oil tank.

3. A method for switching the operating mode of a hydraulic pump, applied to the hydraulic pump operating mode switching device as described in any one of claims 1-2, characterized in that, include: The working mode of the hydraulic pump is set by the working position of the solenoid directional valve. The working position includes the middle working position, the right working position, and the left working position. The working position of the solenoid directional valve is controlled by the energized state of electromagnets S1 and S2 or by manual control. The first load-sensitive pump and the second load-sensitive pump include three operating modes: no-load mode, remote pressure control mode, and constant pressure mode. When the electromagnetic reversing valve switches to the neutral working position, the first load-sensitive pump and the second load-sensitive pump are in no-load mode. When the electromagnetic reversing valve is switched to the right working position, the first load-sensitive pump and the second load-sensitive pump are in remote pressure control mode. When the electromagnetic reversing valve switches to the left working position, the first load-sensitive pump and the second load-sensitive pump are in constant pressure mode.

4. The hydraulic pump operating mode switching method as described in claim 3, characterized in that, The electromagnetic reversing valve has three energized states: electromagnets S1 and S2 are de-energized, electromagnet S1 is de-energized and electromagnet S2 is energized, and magnet S1 is energized and electromagnet S2 is de-energized. When electromagnets S1 and S2 are de-energized, the working position of the electromagnetic reversing valve is the neutral working position. When electromagnet S1 is de-energized and electromagnet S2 is energized, the working position of the electromagnetic reversing valve is the right-hand working position. When electromagnet S1 is energized and electromagnet S2 is de-energized, the working position of the electromagnetic reversing valve is the left position.

5. The hydraulic pump operating mode switching method as described in claim 3, characterized in that, The switching methods of the electromagnetic reversing valve include electric switching and manual switching.

6. A hydraulic pump operating mode switching system, applied to the hydraulic pump operating mode switching device as described in any one of claims 1-2, characterized in that, include: The setting module is used to set the working mode of the hydraulic pump through the working position of the solenoid directional valve. The working position includes the middle working position, the right working position, and the left working position. The working position of the solenoid directional valve is controlled by the energized state of electromagnets S1 and S2 or by manual control. The first load-sensitive pump and the second load-sensitive pump include three operating modes: no-load mode, remote pressure control mode, and constant pressure mode. The first adjustment module is used to ensure that the first load-sensitive pump and the second load-sensitive pump are in no-load mode when the electromagnetic reversing valve is switched to the neutral working position. The second adjustment module is used to put the first load-sensitive pump and the second load-sensitive pump in remote pressure control mode when the electromagnetic reversing valve is switched to the right working position. The third adjustment module is used to ensure that the first load-sensitive pump and the second load-sensitive pump are in constant pressure mode when the electromagnetic reversing valve is switched to the left working position.

7. A terminal device, comprising a memory and a processor, characterized in that, The memory stores a computer program that can run on a processor, and when the processor loads and executes the computer program, it employs the method described in any one of claims 3 to 5.

8. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is loaded and executed by the processor, it employs the method described in any one of claims 3 to 5.

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