Hydraulic system

Abstract

The utility model belongs to the technical field of hydraulic pressure, and particularly relates to a hydraulic system, a main hydraulic oil way comprises an oil cylinder, a first oil pumping assembly and a first pressure detection device, an oil inlet of the oil cylinder communicates with an oil outlet of the first oil pumping assembly, and an oil outlet of the oil cylinder communicates with an oil suction opening of the first oil pumping assembly; a first pressure detection device is arranged at an oil suction port of the first oil pumping assembly; the compensation oil way comprises an oil tank, a second oil pumping assembly and a first control valve, an oil suction port of the second oil pumping assembly communicates with the oil tank, an oil outlet of the second oil pumping assembly communicates with an oil suction port of the first oil pumping assembly through the first control valve, and the second oil pumping assembly is in communication connection with the first pressure detection device. The second oil pumping assembly can be automatically switched between operation and closing based on the pressure value detected by the first pressure detection device so as to supply hydraulic oil to the main hydraulic oil way. The first control valve can be closed when the second oil pumping assembly is closed. According to the scheme, the hydraulic oil supplementing process can be optimized, and the production efficiency is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of hydraulic systems, and particularly relates to a hydraulic system. BACKGROUND

[0002] The injection molding machine is also called a plastic injection molding machine. It is the main molding equipment for making various shape plastic products by using thermoplastic or thermosetting plastics through a plastic molding die. The injection molding machine is usually composed of an injection system, a mold clamping system, a hydraulic system, an electrical control system, a lubrication system, a heating and cooling system, a safety monitoring system, etc. Among them, the hydraulic system provides power for various actions required by the injection molding machine according to the process, and meets the requirements of pressure, speed and position control required by the actions of each part of the injection molding machine. The hydraulic system is mainly composed of various hydraulic elements and hydraulic auxiliary elements.

[0003] At present, the hydraulic system in the injection molding machine mostly adopts an open system or a simple closed system. After a long time of work, the closed hydraulic system will consume a certain amount of oil, so it is necessary to stop the machine and use a device to supplement the oil to the system. The oil supplementing is relatively cumbersome and time-consuming, which reduces the production efficiency. CONTENT OF THE UTILITY MODEL

[0004] The application aims to solve the problem of low production efficiency caused by complex and long oil supplementing of the hydraulic system in the prior art.

[0005] The application provides a hydraulic system, which comprises:

[0006] A main hydraulic oil circuit comprising a cylinder, a first pump oil assembly and a first pressure detection device, wherein the oil inlet of the cylinder is communicated with the oil outlet of the first pump oil assembly, the oil outlet of the cylinder is communicated with the oil suction port of the first pump oil assembly, and the oil suction port of the first pump oil assembly is provided with the first pressure detection device for detecting the pressure value at the oil suction port of the first pump oil assembly;

[0007] A compensation oil circuit comprising an oil tank, a second pump oil assembly and a first control valve, wherein the oil suction port of the second pump oil assembly is communicated with the oil tank, the oil outlet of the second pump oil assembly is communicated with the oil suction port of the first pump oil assembly through the first control valve, the first control valve is used for connecting or disconnecting the compensation oil circuit and the main hydraulic oil circuit, the second pump oil assembly is communicatively connected with the first pressure detection device, the second pump oil assembly can automatically switch between running and closing based on the pressure value detected by the first pressure detection device, so as to supply hydraulic oil to the main hydraulic oil circuit, and the first control valve can be closed when the second pump oil assembly is closed.

[0008] In an exemplary embodiment of the present application, the main hydraulic oil circuit further comprises an energy storage member, which is arranged on the communication pipeline between the main hydraulic oil circuit and the compensation oil circuit, and is connected with the oil suction port of the first pump oil assembly and the first end of the first control valve, and is capable of storing and releasing hydraulic oil.

[0009] In an exemplary embodiment of the present application, the compensation oil circuit further comprises a second control valve, which is an electromagnetic valve, and the first end of the second control valve is connected with the second end of the first control valve, and the second end of the second control valve is in communication with the oil outlet port of the second pump oil assembly.

[0010] In an exemplary embodiment of the present application, the compensation oil circuit further comprises:

[0011] a second pressure detection device, which is arranged between the second pump oil assembly and the second control valve, and is used to detect the pressure value of the oil outlet port of the second pump oil assembly;

[0012] a third control valve, the first end of which is in communication with the oil outlet port of the second pump oil assembly, and the second end of which is in communication with the oil tank, and is used to communicate or disconnect the oil outlet port of the second pump oil assembly and the oil tank.

[0013] In an exemplary embodiment of the present application, the compensation oil circuit further comprises a filter, which is arranged on the connecting pipeline between the second pump oil assembly and the oil tank.

[0014] In an exemplary embodiment of the present application, the compensation oil circuit further comprises:

[0015] a fourth control valve, the first end of which is connected with the oil outlet port of the oil cylinder, the oil suction port of the first pump oil assembly and the first end of the first control valve, and is used to communicate or disconnect the main hydraulic oil circuit and the compensation oil circuit;

[0016] a fifth control valve, the first end of which is in communication with the second end of the fourth control valve, and the second end of which is in communication with the oil tank.

[0017] In an exemplary embodiment of the present application, the main hydraulic oil circuit further comprises:

[0018] a sixth control valve, the first end of which is in communication with the oil outlet port of the first pump oil assembly and the oil inlet port of the oil cylinder, and the second end of which is connected with the oil outlet port of the oil cylinder, the first end of the fourth control valve, the oil suction port of the first pump oil assembly and the first end of the first control valve;

[0019] A third pressure detection device is provided at the oil outlet of the first oil pump assembly to detect the pressure value at the oil outlet of the first oil pump assembly.

[0020] In an exemplary embodiment of the present application, the first control valve and the fourth control valve are one-way valves, the first control valve allows hydraulic oil to flow from the compensation oil circuit to the main hydraulic oil circuit, and the fourth control valve allows hydraulic oil to flow from the main hydraulic oil circuit to the compensation oil circuit;

[0021] The fifth control valve and the sixth control valve are relief valves.

[0022] In an exemplary embodiment of the present application, the second control valve is a solenoid valve;

[0023] The third control valve is a relief valve.

[0024] In an exemplary embodiment of the present application, the main hydraulic oil circuit also includes a seventh control valve, a first end of the seventh control valve is connected to the oil inlet and the oil outlet of the oil cylinder, and a second end of the seventh control valve is connected to the oil suction port and the oil outlet of the first oil pump assembly.

[0025] The hydraulic system of the present application has at least the following beneficial effects:

[0026] The hydraulic system of the present application includes a main hydraulic oil circuit and a compensation oil circuit. The main hydraulic oil circuit and the compensation oil circuit are interconnected. When the first pressure detection device in the main hydraulic oil circuit detects that the pressure at the oil suction port of the first pump oil assembly does not meet the preset pressure range value, the second pump oil assembly can operate based on the pressure value detected by the first pressure detection device, and open the first control valve when the second pump oil assembly is running to pump the hydraulic oil in the oil tank into the oil suction port of the first pump oil assembly to provide hydraulic oil to the main hydraulic oil circuit, thereby automatically compensating the hydraulic oil for the main hydraulic oil circuit, keeping the pressure of the main hydraulic oil circuit within the required range, and making the entire hydraulic system more stable. In addition, during the process of adding hydraulic oil to the main hydraulic oil circuit, the entire process can be automatically controlled without stopping the machine to manually add hydraulic oil, which optimizes the oil replenishment process, saves oil replenishment time, and improves production efficiency.

[0027] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by practice of the present application.

[0028] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments consistent with the application and, together with the description, further serve to explain the principles of the application. It is to be expressly understood, however, that the drawings are included herein for illustrative purposes only and that they are not a limitation on the present application. Thus, those skilled in the art, having the benefit of the description, teachings and constructs herein, can appreciate other embodiments, which are intended to fall within the scope of the present application.

[0030] Figure 1 A hydraulic system structure module schematic diagram provided by an embodiment of the application is shown.

[0031] Legend of reference signs:

[0032] 10, hydraulic system; 100, main hydraulic oil circuit; 110, oil cylinder; 120, first pump oil assembly; 121, first motor; 122, first oil pump; 130, first pressure detection device; 131, first pressure gauge; 132, first pressure sensor; 140, energy storage member; 150, sixth control valve; 160, third pressure detection device; 170, seventh control valve; 181, first on-off valve; 182, second on-off valve; 183, third on-off valve; 200, compensation oil circuit; 210, oil tank; 220, second pump oil assembly; 221, second motor; 222, second oil pump; 230, first control valve; 240, second control valve; 250, second pressure detection device; 251, second pressure gauge; 252, second pressure sensor; 260, third control valve; 270, filter member; 280, fourth control valve; 290, fifth control valve. DETAILED DESCRIPTION

[0033] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations may, however, be implemented in many different forms and should not be construed as limited to the implementations set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and will fully convey the inventive aspects to those skilled in the art. Like reference numerals may refer to like elements throughout.

[0034] In the present application, the terms "first", "second", etc. are used only for the purpose of description, and should not be understood as indicating or implying relative importance or implying the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0035] In this application, unless otherwise specified or limited, terms such as "assembly" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0036] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner.In the following description, many specific details are provided so as to provide a full understanding of the embodiments of the present application. However, it will be appreciated by those skilled in the art that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps etc. can be adopted. In other cases, known methods, devices, implementations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0037] The embodiment of the present application provides a hydraulic system 10, see Figure 1 As shown, the hydraulic system 10 includes a main hydraulic oil circuit 100 and a compensation oil circuit 200. By controlling the flow of hydraulic oil in the compensation oil circuit 200 to the main hydraulic oil circuit 100, oil is supplied to the main hydraulic oil circuit 100, ensuring that the pressure of the hydraulic oil in the main hydraulic oil circuit 100 remains within a desired range, thereby ensuring stable operation of the main hydraulic oil circuit 100.

[0038] It should be noted that the hydraulic system 10 may be a hydraulic oil replenishing system of an injection molding machine, or a hydraulic oil replenishing system of other devices, and is not limited thereto.

[0039] Among them, see Figure 1 As shown, the main hydraulic oil circuit 100 includes a cylinder 110, a first oil pumping assembly 120, and a first pressure detection device 130. The first oil pumping assembly 120 is used to pump hydraulic oil into the cylinder 110. After the hydraulic oil operates in the cylinder 110, it flows back into the first oil pumping assembly 120. During operation of the main hydraulic oil circuit 100, the first pressure detection device 130 continuously detects the pressure at the oil suction port of the first oil pumping assembly 120 to ensure the stability of the hydraulic oil pressure in the main hydraulic oil circuit 100.

[0040] In the examples of this application, see Figure 1As shown, the oil inlet of the oil cylinder 110 is communicated with the oil outlet of the first pump oil assembly 120 through an oil inlet pipeline, the first pump oil assembly 120 pumps hydraulic oil into the oil cylinder 110 through the oil inlet pipeline; the oil outlet of the oil cylinder 110 is communicated with the oil suction port of the first pump oil assembly 120 through an oil outlet pipeline, so as to return the hydraulic oil after working in the oil cylinder 110 to the first pump oil assembly 120. The first pressure detection device 130 is arranged at the oil suction port of the first pump oil assembly 120, so as to continuously detect the pressure of the hydraulic oil flowing into the first pump oil assembly 120.

[0041] In the embodiment of the present application, referring to Figure 1 As shown, the compensation oil circuit 200 comprises an oil tank 210, a second pump oil assembly 220 and a first control valve 230. The oil tank 210 has a space for containing hydraulic oil, and can provide hydraulic oil for the main hydraulic oil circuit 100. The oil suction port of the second pump oil assembly 220 is communicated with the oil tank 210, so as to extract hydraulic oil in the oil tank 210, and the oil outlet of the second pump oil assembly 220 is communicated with the oil suction port of the first pump oil assembly 120 through the first control valve 230, that is, the hydraulic oil in the oil tank 210 is pumped into the oil suction port of the first pump oil assembly 120 through the second pump oil assembly 220, so as to supply oil for the main hydraulic oil circuit 100 and ensure that the main hydraulic oil circuit 100 works in a normal working environment.

[0042] In the embodiment of the present application, the second pump oil assembly 220 is communicatively connected with the first pressure detection device 130, and the second pump oil assembly 220 can automatically switch between running and closing based on the pressure value detected by the first pressure detection device 130, so as to supply hydraulic oil for the main hydraulic oil circuit 100, the first control valve 230 can be opened when the second pump oil assembly 220 is running, and the first control valve 230 can be closed when the second pump oil assembly 220 is closed.

[0043] It can be understood that the second pump oil assembly 220 and the first pressure detection device 130 can be electrically connected through a controller, that is, the controller controls the opening and closing of the second pump oil assembly 220 according to the pressure value detected by the first pressure detection device 130.

[0044] The controller can be a programmable logic controller (PLC) or an industrial PC. The controller is electrically connected with the first pressure detection device 130, the first pump oil assembly 120 and the second pump oil assembly 220, and the controller can control the opening and closing of the first pump oil assembly 120, and the controller can also receive an electrical signal of the first pressure detection device 130, and control the running state of the second pump oil assembly 220 according to the electrical signal.

[0045] For example, when the pressure value detected by the first pressure detection device 130 is within the preset range, it indicates that the pressure at the oil suction port of the first pump oil assembly 120 meets the working environment, the controller controls the second pump oil assembly 220 to be in the closed state, the first control valve 230 is in the closed state, and the main hydraulic oil circuit 100 is in the closed loop. When the pressure value detected by the first pressure detection device 130 is less than the preset range, it indicates that the pressure at the oil suction port of the first pump oil assembly 120 does not meet the working environment, the controller controls the second pump oil assembly 220 to start working, the second pump oil assembly 220 gradually pumps the hydraulic oil in the oil tank 210, the first control valve 230 is in the open state, and the hydraulic oil is pumped into the main hydraulic oil circuit 100, so as to realize automatic compensation of the hydraulic oil in the main hydraulic oil circuit 100, ensure that the main hydraulic oil circuit 100 works in the required environment, and make the entire hydraulic system 10 more stable. And the controller automatically supplies oil to the main hydraulic oil circuit 100, so that the oil supply to the main hydraulic oil circuit 100 can be realized without stopping, saving time, making the oil supply more convenient, and improving the production efficiency.

[0046] It can be understood that when the pressure at the oil suction port of the first pump oil assembly 120 meets the preset pressure range, the controller controls the first pump oil assembly 120 to be in the closed state and stops supplying oil to the main hydraulic oil circuit 100.

[0047] In the embodiment of the present application, as shown in Figure 1 The first pump oil assembly 120 includes a first motor 121 and a first oil pump 122, the first motor 121 is connected with the first oil pump 122, and the first motor 121 can drive the first oil pump 122 to pump the hydraulic oil at the oil outlet into the oil cylinder 110. The second pump oil assembly 220 includes a second motor 221 and a second oil pump 222, the second motor 221 is connected with the second oil pump 222, and the second motor 221 can drive the second oil pump 222 to pump the hydraulic oil at the oil outlet into the main hydraulic oil circuit 100.

[0048] The first motor 121 and the second motor 221 can be servo motors.

[0049] In the embodiment of the present application, as shown in Figure 1 The first pressure detection device 130 includes a first pressure gauge 131 and a first pressure sensor 132, the first pressure gauge 131 is used to display the pressure of the hydraulic oil at the oil suction port of the first oil pump 122, the first pressure sensor 132 is used to detect the pressure of the hydraulic oil at the oil suction port of the first oil pump 122, and convert the detected pressure signal into an electric signal and transmit it to the controller, and the controller judges whether the compensation oil circuit 200 pumps the hydraulic oil into the main hydraulic oil circuit 100 according to the electric signal.

[0050] In the embodiment of the present application, as shown in Figure 1As shown, the main hydraulic oil circuit 100 further comprises an energy storage member 140 capable of storing and releasing hydraulic oil. The energy storage member 140 is arranged in the loop of the main hydraulic oil circuit 100 and the compensation oil circuit 200, i.e. the energy storage member 140 is connected with the oil suction port of the first pump oil assembly 120 and the first end of the first control valve 230.

[0051] The energy storage member 140 can be an accumulator, which can balance the volume difference between the oil suction and the oil discharge of the first oil pump 122. When the oil discharge of the first oil pump 122 is greater than the oil suction, the hydraulic oil enters the accumulator to be stored. When the oil discharge is less than the oil suction, the accumulator releases the previously stored hydraulic oil to make up for the deficiency of the hydraulic oil, so as to ensure the stability and speed of the entire main hydraulic oil circuit 100.

[0052] In the embodiment of the present application, referring to Figure 1 As shown, the compensation oil circuit 200 further comprises a second control valve 240, the first end of the second control valve 240 is connected with the second end of the first control valve 230, and the second end of the second control valve 240 is in communication with the oil discharge port of the second pump oil assembly 220. That is, the second control valve 240 is arranged between the first control valve 230 and the second pump oil assembly 220. The second control valve 240 is further electrically connected with the controller, i.e. the controller can control the opening and closing of the second control valve 240 according to the pressure signal detected by the first pressure detection device 130, so as to open or disconnect the pipeline between the compensation oil circuit 200 and the main hydraulic oil circuit 100.

[0053] It can be understood that by arranging the second control valve 240, when the first control valve 230 fails, the main hydraulic oil circuit 100 and the compensation oil circuit 200 can be kept disconnected in the normal working environment, so that the main hydraulic oil circuit 100 is in a closed loop.

[0054] In the embodiment of the present application, referring to Figure 1As shown, the compensation oil circuit 200 further comprises a second pressure detection device 250 and a third control valve 260. The second pressure detection device 250 is arranged between the second pump oil assembly 220 and the second control valve 240 to detect the pressure value at the oil outlet of the second pump oil assembly 220. The second pressure detection device 250 comprises a second pressure gauge 251 and a second pressure sensor 252. The second pressure gauge 251 is used to display the pressure at the oil outlet of the second pump 222, and the second pressure sensor 252 is used to detect the hydraulic oil pressure at the oil outlet of the second pump 222 and convert the detected pressure signal into an electrical signal, which is transmitted to the controller. The controller determines whether to open the third control valve 260 according to the electrical signal. The first end of the third control valve 260 is in communication with the oil outlet of the second pump 222, and the second end of the third control valve 260 is in communication with the oil tank 210. That is, when the hydraulic oil pressure at the oil outlet of the second pump 222 is greater than a predetermined range, the third control valve 260 is opened, and the hydraulic oil at the oil outlet of the second pump 222 is discharged into the oil tank 210, thereby reducing the pressure of the hydraulic oil at the oil outlet of the second pump 222 to protect the compensation oil circuit 200.

[0055] In the embodiment of the present application, referring to Figure 1 As shown, the compensation oil circuit 200 further comprises a filter 270 arranged on the connecting pipeline between the second pump oil assembly 220 and the oil tank 210, i.e., the filter 270 is arranged on the connecting pipeline between the second pump 222 and the oil tank 210. The filter 270 can be a filter that can remove impurities in the hydraulic oil to ensure the purity of the hydraulic oil and thus ensure the normal operation of the main hydraulic oil circuit 100.

[0056] In the embodiment of the present application, referring to Figure 1 As shown, the compensation oil circuit 200 further comprises a fourth control valve 280 and a fifth control valve 290. The first end of the fourth control valve 280 is connected to the oil outlet of the oil cylinder 110, the oil suction port of the first pump oil assembly 120, and the first end of the first control valve 230 to communicate or disconnect the main hydraulic oil circuit 100 and the compensation oil circuit 200. The first end of the fifth control valve 290 is in communication with the second end of the fourth control valve 280, and the second end of the fifth control valve 290 is in communication with the oil tank 210. The hydraulic oil in the main hydraulic oil circuit 100 can be discharged into the oil tank 210 through the fourth control valve 280 and the fifth control valve 290.

[0057] In the embodiment of the present application, referring to Figure 1 As shown, the main hydraulic oil circuit 100 further comprises a sixth control valve 150. The first end of the sixth control valve 150 is in communication with the oil outlet of the oil cylinder 110 and the oil inlet of the oil cylinder 110, and the second end of the sixth control valve 150 is connected to the oil outlet of the oil cylinder 110, the first end of the fourth control valve, the oil suction port of the first pump oil assembly 120, and the first end of the first control valve 230.

[0058] In the examples of this application, see Figure 1 As shown, the main hydraulic oil circuit 100 also includes a third pressure detection device 160, which can be a pressure sensor. The third pressure detection device 160 is connected to the controller and is located at the oil outlet of the first oil pump assembly 120 to detect the pressure value at the oil outlet of the first oil pump assembly 120. The controller can open or close the sixth control valve 150 based on the pressure value detected by the third pressure detection device 160.

[0059] That is, when the pressure value detected by the third pressure detection device 160 is greater than the preset pressure range, the controller controls the sixth control valve 150 to open, returning the hydraulic oil at the oil outlet of the first oil pump 122 to the oil suction port of the first oil pump 122, thereby reducing the hydraulic oil pressure in the pipeline from the first oil pump 122 to the oil cylinder 110. When the pressure value detected by the third pressure detection device 160 is within the preset pressure range, the controller controls the sixth control valve 150 to close, and the hydraulic oil at the oil outlet of the first oil pump 122 is pumped into the oil cylinder 110.

[0060] In the examples of this application, see Figure 1 As shown, the first control valve 230 and the fourth control valve 280 can be one-way valves. The first control valve 230 allows hydraulic oil to flow from the compensation circuit to the main hydraulic circuit 100, while the fourth control valve 280 allows hydraulic oil to flow from the main hydraulic circuit 100 to the compensation circuit 200. The fifth control valve 290 and the sixth control valve 150 are relief valves, allowing hydraulic oil to be discharged when it reaches a set pressure to prevent overpressure in the main hydraulic circuit 100 and the compensation circuit 200. These constant-pressure relief valves provide safety protection for system pressure stabilization and load unloading.

[0061] Understandably, see Figure 1 As shown, when the compensation oil circuit 200 does not supply oil to the main hydraulic oil circuit 100 , the main hydraulic oil circuit 100 forms a closed loop due to restrictions of the first control valve 230 and the fifth control valve 290 .

[0062] In the examples of this application, see Figure 1 As shown, the second control valve 240 is a solenoid valve electrically connected to the controller. It opens when oil needs to be supplied to the main hydraulic oil circuit 100 and closes when oil is not supplied to the main hydraulic oil circuit 100. The third control valve 260 is a relief valve to prevent overpressure of the hydraulic oil in the pipeline from the second oil pump 222 to the second control valve 240. It provides a constant pressure relief function, providing safety protection for system pressure stabilization and unloading.

[0063] In the examples of this application, see Figure 1As shown, the main hydraulic oil circuit 100 further comprises a seventh control valve 170, a first end of the seventh control valve 170 being in communication with the oil inlet of the oil cylinder 110 and the oil outlet of the oil cylinder 110, and a second end of the seventh control valve 170 being in communication with the oil suction port of the first pump oil assembly 120 and the oil outlet of the first pump oil assembly 120. The seventh control valve 170 can be an electromagnetic valve, which can open and close the pipeline between the first oil pump 122 and the oil cylinder 110.

[0064] In the embodiments of the present application, referring to Figure 1 As shown, the hydraulic system 10 further comprises a plurality of switch valves to ensure the stability of the hydraulic system 10.

[0065] For example, referring to ​ As shown, the main hydraulic oil circuit 100 comprises a first switch valve 181, a second switch valve 182 and a third switch valve 183, the first switch valve 181 and the second switch valve 182 being arranged between the first pressure gauge 131 and the first control valve 230. The third switch valve 183 is arranged between the oil suction port of the first oil pump 122 and the fourth switch valve.

[0066] The present application has at least the following beneficial effects:

[0067] The first pressure sensor 132 detects the pressure value at the oil suction port of the first oil pump 122 and transmits an electric signal to the controller, and the controller controls the working state of the second motor 221 and the second oil pump 222 according to the relationship between the electric signal and the preset pressure range value, and then determines whether the main hydraulic oil circuit 100 needs to be supplied with oil. By using the automatic oil supply of the controller, the oil supply time is saved, the operation is simplified, the working environment can be continuously ensured, the production efficiency is improved, and the entire hydraulic system 10 is more stable and fast.

[0068] In the description of the present specification, the description referring to the terms "some embodiments", "exemplarily", and the like means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are contained in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0069] Although the embodiments of the present application have been shown and described above, it is to be understood that the above embodiments are merely exemplary, and are not to be understood as limiting the present application, and the ordinary skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application, and any changes or modifications made according to the claims and the specification of the present application shall be within the scope of the present application.

Claims

1. A hydraulic system, characterized in that: include: A main hydraulic oil circuit includes an oil cylinder, a first oil pumping assembly, and a first pressure detecting device, wherein the oil inlet of the oil cylinder is connected to the oil outlet of the first oil pumping assembly, and the oil outlet of the oil cylinder is connected to the oil suction port of the first oil pumping assembly. The first pressure detecting device is provided at the oil suction port of the first oil pumping assembly for detecting the pressure value at the oil suction port of the first oil pumping assembly; The compensation oil circuit includes an oil tank, a second oil pump assembly and a first control valve. The oil suction port of the second oil pump assembly is connected to the oil tank, and the oil outlet of the second oil pump assembly is connected to the oil suction port of the first oil pump assembly through the first control valve. The first control valve is used to connect or disconnect the compensation oil circuit and the main hydraulic oil circuit. The second oil pump assembly is communicatively connected to the first pressure detection device. The second oil pump assembly can automatically switch between operation and shutdown based on the pressure value detected by the first pressure detection device to supply hydraulic oil to the main hydraulic oil circuit; the first control valve can be closed when the second oil pump assembly is closed.

2. The hydraulic system according to claim 1, characterized in that The main hydraulic oil circuit also includes an energy storage component, which is arranged on the connecting pipeline between the main hydraulic oil circuit and the compensation oil circuit. The energy storage component is connected to the oil suction port of the first pump oil assembly and the first end of the first control valve. The energy storage component can store and release hydraulic oil.

3. The hydraulic system according to claim 1, characterized in that The compensation oil circuit further includes a second control valve, a first end of the second control valve is connected to the second end of the first control valve, and a second end of the second control valve is communicated with the oil outlet of the second oil pump assembly.

4. The hydraulic system according to claim 3, characterized in that The compensation oil circuit also includes: A second pressure detection device is provided between the second oil pump assembly and the second control valve to detect the pressure value of the oil outlet of the second oil pump assembly; A third control valve, wherein the first end of the third control valve is connected to the oil outlet of the second oil pump assembly, and the second end of the third control valve is connected to the oil tank, so as to connect or disconnect the oil outlet of the second oil pump assembly and the oil tank.

5. The hydraulic system according to claim 4, characterized in that The compensation oil circuit further includes a filter element, which is arranged on the connecting pipeline between the second oil pump assembly and the oil tank.

6. The hydraulic system according to claim 1, characterized in that The compensation oil circuit also includes: a fourth control valve, a first end of the fourth control valve being connected to the oil outlet of the oil cylinder, the oil suction port of the first oil pump assembly, and the first end of the first control valve, so as to connect or disconnect the main hydraulic oil circuit and the compensation oil circuit; A fifth control valve, wherein a first end of the fifth control valve is communicated with a second end of the fourth control valve, and a second end of the fifth control valve is communicated with the oil tank.

7. The hydraulic system according to claim 6, characterized in that The main hydraulic oil circuit also includes: a sixth control valve, wherein a first end of the sixth control valve is connected to the oil outlet of the first oil pump assembly and the oil inlet of the oil cylinder, and a second end of the sixth control valve is connected to the oil outlet of the oil cylinder, the first end of the fourth control valve, the oil suction port of the first oil pump assembly, and the first end of the first control valve; A third pressure detection device is provided at the oil outlet of the first oil pump assembly to detect the pressure value at the oil outlet of the first oil pump assembly.

8. The hydraulic system according to claim 7, characterized in that: The first control valve and the fourth control valve are one-way valves. The first control valve allows hydraulic oil to flow from the compensation oil circuit to the main hydraulic oil circuit, and the fourth control valve allows hydraulic oil to flow from the main hydraulic oil circuit to the compensation oil circuit. The fifth control valve and the sixth control valve are relief valves.

9. The hydraulic system according to claim 4, characterized in that The second control valve is a solenoid valve; The third control valve is a relief valve.

10. The hydraulic system according to claim 1, wherein: The main hydraulic oil circuit also includes a seventh control valve, a first end of the seventh control valve is connected to the oil inlet and the oil outlet of the oil cylinder, and a second end of the seventh control valve is connected to the oil suction port and the oil outlet of the first oil pump assembly.

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