Hydraulic system

Abstract

The invention belongs to the technical field of injection molding machines, and particularly relates to a hydraulic system which comprises a power mechanism, a control valve set, an executing mechanism, an oil tank and an oil supplementing mechanism. A fourth oil inlet of the executing mechanism is communicated with a second oil outlet of the control valve group, and a fourth oil outlet of the executing mechanism is communicated with a third oil inlet of the control valve group; a fifth oil inlet of the oil tank is communicated with a third oil outlet of the control valve group, and a fifth oil outlet of the oil tank is communicated with a first oil inlet of the power mechanism; a sixth oil inlet of the oil supplementing mechanism is communicated with an oil drainage port of the oil tank, and a sixth oil outlet of the oil supplementing mechanism is communicated with an oil supplementing inlet of the oil tank; the power mechanism can pump hydraulic oil in the oil tank into the control valve set, the hydraulic oil is released into the executing mechanism through the control valve set so that the executing mechanism can complete injection molding, the hydraulic oil passing through the executing mechanism flows back into the oil tank, and the oil supplementing mechanism can supplement the hydraulic oil into the oil tank.

Description

Technical Field

[0001] The present application belongs to the technical field of injection molding machines, and specifically relates to a hydraulic system. Background Art

[0002] Injection molding machine is also known as plastic injection molding machine. It is the main molding equipment that uses plastic molding molds to make plastic products of various shapes from thermoplastics or thermosetting plastics. Injection molding machines are usually composed of injection systems, mold clamping systems, hydraulic systems, electrical control systems, lubrication systems, heating and cooling systems, safety monitoring systems, etc. Among them, the hydraulic system provides power for the various actions of the injection molding machine according to the process requirements, and meets the pressure, speed and position control requirements of the various parts of the injection molding machine. The hydraulic system is mainly composed of various hydraulic components and hydraulic auxiliary components.

[0003] At present, the hydraulic system in the injection molding machine mostly adopts an open system. After working for a long time, the system will cause the hydraulic oil to be contaminated, resulting in increased energy consumption of the injection molding machine equipment and reduced efficiency of the injection molding machine equipment. Summary of the invention

[0004] The purpose of the present application is to solve the problem in the prior art that an open system causes hydraulic oil pollution, resulting in increased energy consumption of injection molding equipment and reduced efficiency of injection molding equipment.

[0005] The first aspect of the present application provides a hydraulic system, comprising:

[0006] The power mechanism is provided with a first oil inlet and a first oil outlet;

[0007] A control valve group, comprising a second oil inlet, a third oil inlet, a second oil outlet and a third oil outlet, wherein the second oil inlet is connected to the first oil outlet;

[0008] The actuator is provided with a fourth oil inlet and a fourth oil outlet, wherein the fourth oil inlet is communicated with the second oil outlet, and the fourth oil outlet is communicated with the third oil inlet;

[0009] An oil tank, provided with an oil replenishment inlet, a fifth oil inlet, a fifth oil outlet and an oil drain, wherein the fifth oil inlet is communicated with the third oil outlet, and the fifth oil outlet is communicated with the first oil inlet;

[0010] The oil replenishing mechanism is provided with a sixth oil inlet and a sixth oil outlet, the sixth oil inlet is communicated with the oil drain port, and the sixth oil outlet is communicated with the oil replenishing inlet;

[0011] Among them, the power mechanism can draw the hydraulic oil in the oil tank into the control valve group, and release the hydraulic oil to the actuator through the control valve group, so that the actuator completes injection molding, and the hydraulic oil passing through the actuator structure flows back to the oil tank, and the oil replenishing mechanism can replenish the hydraulic oil into the oil tank.

[0012] In an exemplary embodiment of the present application, the hydraulic system further includes a controller; the oil tank includes:

[0013] An air storage cylinder, wherein the air storage cylinder is provided with an air charging port, an air exhaust port, and a storage chamber arranged inside the air storage cylinder, and the storage chamber is connected to the outside through the air charging port / the air exhaust port;

[0014] a sliding member, disposed inside the storage chamber and sealedly connected to the inner wall of the storage chamber, the sliding member dividing the storage chamber into a gas chamber and a communication chamber, the gas chamber being connected to the outside through the inflation port, and the communication chamber being connected to the outside through the exhaust port;

[0015] An oil storage cylinder is arranged side by side with the gas storage cylinder, the oil storage cylinder is provided with an oil discharge pipe and an oil storage chamber for storing hydraulic oil, the oil storage chamber is communicated with the first oil inlet of the power mechanism through the oil discharge pipe, the oil storage chamber is provided with the oil replenishment inlet, and the oil storage chamber is communicated with the communication chamber;

[0016] A first pressure sensor is arranged outside the oil storage cylinder, and the first pressure sensor can detect the pressure value of the hydraulic oil inside the oil storage chamber;

[0017] Among them, the controller can control the volume of gas released into the gas chamber according to the hydraulic oil pressure value detected by the first pressure sensor, so as to control the position of the sliding member inside the storage chamber, so as to adjust the volume size of the gas chamber and the connecting chamber.

[0018] In an exemplary embodiment of the present application, the gas storage cylinder and the oil storage cylinder are arranged side by side up and down.

[0019] In an exemplary embodiment of the present application, the gas storage cylinder comprises:

[0020] A first cylinder head, provided with the charging port;

[0021] a second cylinder head, opposite to and spaced from the first cylinder head, the second cylinder head being provided with the exhaust port;

[0022] A cylinder barrel, the cylinder barrel is a hollow structure, opposite ends of the cylinder barrel are respectively connected to the first cylinder head and the second cylinder head, and form the storage chamber with the first cylinder head and the second cylinder head;

[0023] The sliding member is arranged inside the cylinder barrel and sealed with the inner wall of the cylinder barrel, the sliding member and one side of the second cylinder head form the connecting chamber, and the sliding member and one side of the first cylinder head form the gas chamber.

[0024] In an exemplary embodiment of the present application, the oil storage cylinder comprises:

[0025] a first oil cylinder cover, arranged below the first cylinder cover and abutting against the first cylinder cover, the first oil cylinder cover being provided with the oil drain pipe;

[0026] a second oil cylinder head, opposite to and spaced from the first oil cylinder head, and the second oil cylinder head is arranged below and abuts against the second oil cylinder head, and the first pressure sensor is arranged on the second oil cylinder head and communicated with the oil storage chamber;

[0027] The oil cylinder barrel is a hollow structure, and the opposite ends of the oil cylinder barrel are respectively connected to the first oil cylinder head and the second oil cylinder head, and form the oil storage cavity with the first oil cylinder head and the second oil cylinder head.

[0028] In an exemplary embodiment of the present application, the fuel tank further includes:

[0029] a first connecting member, one end of which is connected to the first cylinder head, and the other end of which is connected to the second cylinder head;

[0030] A second connecting member, one end of which is connected to the first oil cylinder cover, and the other end of which is connected to the second oil cylinder cover.

[0031] In an exemplary embodiment of the present application, the oil storage cylinder further includes a filter element disposed inside the oil storage cavity, and the filter element is connected to a side of the oil drain pipe away from the power mechanism.

[0032] In an exemplary embodiment of the present application, the oil replenishing mechanism includes:

[0033] Filling tank;

[0034] a first oil pump assembly, wherein an oil suction port of the first oil pump assembly is communicated with the oil replenishment tank, and an oil outlet of the first oil pump assembly is communicated with the oil replenishment inlet;

[0035] a first control valve, the first control valve being arranged on a connecting pipeline between an oil outlet of the first oil pump assembly and the oil replenishment inlet;

[0036] A second control valve is provided on the connecting pipeline between the oil drain port and the sixth oil inlet;

[0037] The controller can control the first oil pumping assembly to be in an operating state or a stopping state based on the pressure value detected by the first pressure sensor.

[0038] In an exemplary embodiment of the present application, the first control valve and the second control valve are one-way valves;

[0039] Among them, the first control valve allows the hydraulic oil to flow from the oil outlet of the first pump oil assembly to the oil replenishment inlet of the oil tank; the second control valve allows the hydraulic oil to flow from the oil drain port to the sixth oil inlet of the oil replenishment tank.

[0040] In an exemplary embodiment of the present application, the hydraulic system also includes a cooling element, which is provided with a seventh oil inlet and a seventh oil outlet, the seventh oil inlet is connected to the third oil outlet of the control valve group, and the seventh oil outlet is connected to the fifth oil inlet of the oil tank.

[0041] The hydraulic system of the present application has at least the following beneficial effects:

[0042] This application uses a power mechanism, a control valve group, an actuator, an oil tank and an oil replenishing mechanism to make the hydraulic oil work in a closed environment, thereby preventing hydraulic oil pollution, reducing energy loss, and further reducing the energy consumption of the injection molding machine, and improving the stability and service life of the hydraulic system. The oil replenishing mechanism can also effectively provide automatic closed oil supply to the oil tank, reduce hydraulic oil pollution, improve the cleanliness of the hydraulic oil, and avoid stopping the machine to supply oil to the oil tank, saving oil supply time, simplifying operation, ensuring that the hydraulic system can continue to be in a working environment, improving production efficiency, and making the entire hydraulic system more stable and fast.

[0043] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by the practice of the present application.

[0044] 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

[0045] The drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0046] Figure 1 A schematic diagram of the connection structure of the power mechanism, control valve group, actuator, cooling element, oil tank and oil replenishing mechanism provided in an embodiment of the present application is shown.

[0047] Figure 2 A schematic diagram of the three-dimensional structure of the oil tank provided in an embodiment of the present application is shown.

[0048] Figure 3 A schematic diagram of the structure of the oil tank provided in an embodiment of the present application from a left perspective is shown.

[0049] Figure 4 Shows Figure 3 A schematic diagram of the cross-sectional structure taken along the section line AA'.

[0050] Figure 5 The figure shows a connection structure diagram between the oil replenishing mechanism and the oil tank provided in an embodiment of the present application.

[0051] Description of reference numerals:

[0052] 100. Hydraulic system;

[0053] 110, power mechanism; 111, first motor; 112, motor oil pump flange; 113, coupling; 114, first oil pump; 114a, first oil inlet; 114b, first oil outlet;

[0054] 120, control valve group; 120a, second oil inlet; 120b, third oil inlet; 120c, second oil outlet; 120d, third oil outlet;

[0055] 130, actuator; 130a, fourth oil inlet; 130b, fourth oil outlet;

[0056] 140, oil tank; 140a, oil replenishment inlet; 140b, fifth oil outlet; 140c, fifth oil inlet; 140d, oil drain port; 141, gas storage cylinder; 141a, charging port; 141b, exhaust port; 141c, gas chamber; 141d, connecting chamber; 1411, cylinder barrel; 14111, first mounting platform; 14112, second mounting platform; 1412, first cylinder head; 14121, first groove; 1413, second cylinder head; 14131, second groove; 14132, fifth groove; 1 42. Sliding member; 1421. Piston; 1422. Sealing member; 143. Oil storage cylinder; 1431. Oil drain pipe; 1432. Oil storage chamber; 1433. Oil cylinder barrel; 14331. Third mounting platform; 14332. Fourth mounting platform; 1434. First oil cylinder cover; 14341. Third groove; 1435. Second oil cylinder cover; 14351. Fourth groove; 1436. Filter; 144. First pressure sensor; 145. Fastener; 146. First connecting member; 147. Second connecting member; 148. Needle valve;

[0057] 150, oil replenishing mechanism; 150a, sixth oil inlet; 150b, sixth oil outlet; 151, oil replenishing tank; 152, first oil pump assembly; 1520, second motor; 1521, second oil pump; 153, first control valve; 154, second control valve; 155, filter; 156, solenoid valve; 157, third overflow valve;

[0058] 160, first pressure detection device; 170, first overflow valve; 180, second pressure detection device; 181, pressure gauge; 182, second pressure sensor; 190, second overflow valve; 1100, cooling element; 1100a, seventh oil inlet; 1100b, seventh oil outlet. DETAILED DESCRIPTION

[0059] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be more comprehensive and complete and fully convey the concept of the example embodiments to those skilled in the art.

[0060] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0061] In this application, unless otherwise clearly specified and limited, the terms "assembly", "connection" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0062] 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 to provide a full understanding of the embodiments of the present application. However, those skilled in the art will appreciate 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, realizations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0063] Figure 1 A schematic diagram of the connection structure of the power mechanism, control valve group, actuator, cooling element, oil tank and oil replenishing mechanism provided in an embodiment of the present application is shown.

[0064] The embodiment of the present application provides a hydraulic system 100, which can be applied to an injection molding machine to implement an injection molding process.

[0065] In some embodiments of the present application, see Figure 1 As shown, the hydraulic system 100 includes a power mechanism 110 , a control valve group 120 , an actuator 130 , an oil tank 140 and an oil replenishing mechanism 150 .

[0066] In some embodiments of the present application, see Figure 1 As shown, the power mechanism 110 includes a first motor 111, a motor oil pump flange 112, a coupling 113 and a first oil pump 114. The first motor 111 is connected to the first oil pump 114 through the motor oil pump flange 112 and the coupling 113. Under the action of the servo motor and the coupling 113, the first oil pump 114 rotates at the same speed as the first motor 111 to pump out the hydraulic oil in the oil tank 140.

[0067] It should be noted that the first motor 111 may be a servo motor, or other types of motors.

[0068] In some embodiments of this application, please continue to refer to Figure 1As shown, the first oil pump 114 is provided with a first oil inlet 114a and a first oil outlet 114b. The first oil inlet 114a is connected to the oil tank 140, and the first oil outlet 114b is connected to the control valve group 120. The first oil pump 114 can be used to pressurize the hydraulic oil in the oil tank 140 and then draw it into the control valve group 120.

[0069] In some embodiments of this application, please continue to refer to Figure 1 As shown, the control valve group 120 is provided with a second oil inlet 120a, a third oil inlet 120b, a second oil outlet 120c and a third oil outlet 120d. The second oil inlet 120a is connected to the first oil outlet 114b of the first oil pump 114, so that the hydraulic oil pumped by the first oil pump 114 flows into the control valve group 120.

[0070] It is understandable that the control valve group 120 can be responsible for adjusting parameters such as pressure and flow of the oil circuit to ensure stable operation of the system.

[0071] In some embodiments of this application, please continue to refer to Figure 1 As shown, the actuator 130 is interconnected with the control valve group 120 , and the control valve group 120 can control the hydraulic oil to flow into the actuator 130 . The actuator 130 can move under the action of the hydraulic oil to achieve the injection molding effect.

[0072] In some embodiments of this application, please continue to refer to Figure 1 As shown, the actuator 130 is provided with a fourth oil inlet 130a and a fourth oil outlet 130b. The fourth oil inlet 130a is connected to the second oil outlet 120c of the control valve group 120. The hydraulic oil after injection molding in the actuator 130 flows back to the control valve group 120 through the fourth oil outlet 130b and the third oil inlet 120b.

[0073] In some embodiments of this application, please continue to refer to Figure 1 As shown, the oil tank 140 is connected to the control valve group 120, and the hydraulic oil after working in the actuator 130 flows back to the oil tank 140 through the control valve group 120. The hydraulic oil in the oil tank 140 is pumped out again by the first oil pump 114 to continuously supply oil to the actuator 130 and continuously complete the injection molding.

[0074] In some embodiments of this application, please continue to refer to Figure 1 As shown, the oil tank 140 is provided with an oil replenishment inlet 140a, a fifth oil outlet 140b, a fifth oil inlet 140c and an oil drain port 140d. The oil tank 140 can store hydraulic oil, and the oil tank 140 is a sealed structure, which can ensure that the hydraulic oil does not contact with the air and ensure the cleanliness of the hydraulic oil.

[0075] Among them, the fifth oil inlet 140c of the oil tank 140 is connected to the third oil outlet 120d of the control valve group 120, and the fifth oil outlet 140b is connected to the first oil inlet 114a. The first oil pump 114 can extract the hydraulic oil in the oil tank 140 through the first oil inlet 114a and the fifth oil outlet 140b, so that the hydraulic oil can continue to provide power for the actuator 130 and continue to complete the injection molding.

[0076] In some embodiments of this application, please continue to refer to Figure 1 As shown, the oil replenishing mechanism 150 includes a sixth oil inlet 150a and a sixth oil outlet 150b. The sixth oil inlet 150a is interconnected with the oil drain port 140d in the oil tank 140 to discharge the hydraulic oil in the oil tank 140. The sixth oil outlet 150b is interconnected with the oil replenishing inlet 140a of the oil tank 140 to replenish the oil in the oil tank 140.

[0077] For example, when the flow rate of the hydraulic oil in the oil tank 140 is less than the preset pressure range value, the oil replenishing mechanism 150 replenishes the hydraulic oil into the oil tank 140 through the sixth oil outlet 150b and the oil replenishing inlet 140a to ensure continuous and stable operation of the hydraulic system 100.

[0078] When the flow rate of the hydraulic oil in the oil tank 140 is higher than or the hydraulic system 100 needs to be shut down for cleaning, the hydraulic oil in the oil tank 140 is recovered to the oil replenishing mechanism 150 through the sixth oil inlet 150a and the oil drain port 140d, so as to clean and repair the hydraulic system 100, thereby ensuring that the hydraulic system 100 maintains stable operation.

[0079] The present application solution can pump the hydraulic oil in the oil tank 140 into the control valve group 120 through the first oil pump 114 in the power mechanism 110, and then adjust the pressure and flow of the hydraulic oil entering the actuator 130 through the regulation of the control valve group 120 to ensure stable operation of the system. After the hydraulic oil is used in the actuator 130, it is recovered to the oil tank 140, and the hydraulic oil in the oil tank 140 is again pumped out by the first oil pump 114 and enters the control valve group 120 and the actuator 130. In this way, continuous injection molding of the injection molding machine is achieved through the hydraulic system 100 in the present application.

[0080] The present application solution uses a power mechanism 110, a control valve group 120, an actuator 130, an oil tank 140 and an oil replenishing mechanism 150 to keep the hydraulic oil flowing in a closed environment, making the hydraulic oil less susceptible to contamination, reducing energy consumption, and improving the stability and life of the hydraulic system 100, thereby improving the production efficiency of the injection molding machine.

[0081] In addition, the oil replenishing mechanism 150 can ensure that the hydraulic oil in the oil tank 140 works under a normal pressure environment, avoiding shutdowns for oil replenishment and improving production efficiency.

[0082] Figure 2 A schematic diagram of the three-dimensional structure of the oil tank provided in an embodiment of the present application is shown. Figure 3 A schematic diagram of the structure of the oil tank provided in an embodiment of the present application from a left perspective is shown. Figure 4 Shows Figure 3 A schematic diagram of the cross-sectional structure taken along the section line AA'.

[0083] In some embodiments of this application, see Figures 2 to 4 As shown, the oil tank 140 may include an air storage cylinder 141. The air storage cylinder 141 may be a cylindrical structure, and a certain volume of medium may be stored therein. Of course, the air storage cylinder 141 may also be in other shapes, such as a cuboid or ellipsoid structure.

[0084] In some embodiments of this application, see Figure 2 As shown, the gas storage cylinder 141 is provided with a charging port 141a, an exhaust port 141b, and a storage chamber provided inside the gas storage cylinder 141. The storage chamber can be connected to the outside through the charging port 141a and the exhaust port 141b, so as to fill the storage chamber with gas or release the gas in the storage chamber to the outside to increase the pressure in the storage chamber or reduce the pressure in the storage chamber.

[0085] In some embodiments of this application, see Figure 4 As shown, the oil tank 140 may further include a sliding member 142. The shape of the sliding member 142 may be designed according to the shape of the longitudinal section of the gas storage cylinder 141. For example, if the longitudinal section of the gas storage cylinder 141 is circular, the shape of the sliding member 142 is circular; if the longitudinal section of the gas storage cylinder 141 is square, the shape of the sliding member 142 is square.

[0086] In some embodiments of this application, please continue to refer to Figure 4 As shown, the sliding member 142 can be slidably disposed in the storage chamber, and the sliding member 142 is sealed and connected to the inner wall of the storage chamber, and the sliding member 142 can divide the storage chamber into a gas chamber 141c and a communication chamber 141d. The gas chamber 141c and the communication chamber 141d are isolated from each other, that is, the medium between the gas chamber 141c and the communication chamber 141d cannot flow between the gas chamber 141c and the communication chamber 141d.

[0087] In some embodiments of this application, please continue to refer to Figure 4As shown, the gas chamber 141c is connected to the outside through the inflation port 141a. Gas can be pumped into the gas chamber 141c through the inflation port 141a to change the pressure in the gas chamber 141c, thereby pushing the sliding member 142 to slide in the storage chamber, changing the volume of the gas chamber 141c and the volume of the connecting chamber 141d.

[0088] For example, when the sliding member 142 moves away from the inflation port 141a, the volume of the gas chamber 141c gradually increases, and the volume of the connecting chamber 141d gradually decreases. When the sliding member 142 moves toward the inflation port 141a, the volume of the gas chamber 141c gradually decreases, and the volume of the connecting chamber 141d gradually increases.

[0089] In some embodiments of this application, please continue to refer to Figure 4 As shown, the communication chamber 141d is connected to the outside through the exhaust port 141b, and the exhaust port 141b can exhaust the gas in the communication chamber 141d.

[0090] In some embodiments of this application, please continue to refer to Figure 4 As shown, the oil tank 140 may further include an oil storage cylinder 143. The oil storage cylinder 143 may be used to store hydraulic oil for the hydraulic system 100. The oil storage cylinder 143 may be a cylindrical structure or other shapes, such as a rectangular parallelepiped or ellipsoidal structure.

[0091] In some embodiments of this application, please continue to refer to Figure 4 As shown, the oil storage cylinder 143 is provided with an oil discharge pipe 1431 and an oil storage chamber 1432. One end of the oil discharge pipe 1431 is connected to the first oil inlet 114a of the first oil pump 114, and the other end of the oil discharge pipe 1431 extends into the oil storage chamber 1432. The oil discharge pipe 1431 extends into the oil storage chamber 1432 to directly extract the hydraulic oil in the oil storage chamber 1432, which can increase the extraction rate of the hydraulic oil and reduce the resistance of the hydraulic oil extraction, so as to improve the extraction effect of the hydraulic oil.

[0092] In some embodiments of the present application, the oil storage cylinder 143 and the air storage cylinder 141 are arranged side by side, and the oil storage chamber 1432 in the oil storage cylinder 143 is connected to the connecting chamber 141d in the air storage cylinder 141, so that a certain amount of hydraulic oil is stored in the connecting chamber 141d.

[0093] It can be understood that when the sliding member 142 moves toward the side away from the inflation port 141a, the sliding member 142 will squeeze the hydraulic oil in the connecting chamber 141d, so that the pressure of the hydraulic oil in the connecting chamber 141d and the oil storage chamber 1432 gradually increases.

[0094] In some embodiments of the present application, the injection molding machine further includes a controller (not shown in the figure). The controller can control the first oil pump 114 to be in a working state or a shutdown state. The controller can be a programmable logic controller (PLC) or an industrial PC.

[0095] In some embodiments of this application, see Figure 2 As shown, the oil tank 140 further includes a first pressure sensor 144. The first pressure sensor 144 is disposed outside the oil storage cylinder 143 to detect the pressure value of the hydraulic oil inside the oil storage chamber 1432 and to transmit the measured hydraulic oil pressure value to the controller; that is, the first pressure sensor 144 is electrically connected to the controller.

[0096] In some embodiments of the present application, a first preset pressure range value is provided in the controller. When the pressure value of the hydraulic oil in the oil storage chamber 1432 measured by the first pressure sensor 144 is less than the first preset pressure range value, the controller will control the volume of gas entering the gas chamber 141c through the inflation port 141a, and then control the sliding member 142 to slide toward the side away from the inflation port 141a. The sliding member 142 squeezes the hydraulic oil in the connecting chamber 141d, so that the pressure of the hydraulic oil gradually increases, so as to ensure that the hydraulic oil in the oil storage chamber 1432 remains within the first preset pressure range value, thereby ensuring that the hydraulic system 100 operates stably.

[0097] In some embodiments of the present application, the injection molding machine further includes an air pump (not shown in the figure). The air pump is connected to the air filling port 141a on the air storage cylinder 141, and can release gas (for example, inert gas such as nitrogen) into the gas chamber 141c in the air storage cylinder 141. The air pump is also electrically connected to the controller, and the controller can control the air pump to be in a working state or a shutdown state.

[0098] That is to say, the first pressure sensor 144, the controller and the air pump can keep the hydraulic oil in the oil storage chamber 1432 within the first preset pressure range value, so that the hydraulic oil always maintains a positive pressure environment.

[0099] For example, if the pressure value of the hydraulic oil in the oil storage chamber 1432 measured by the first pressure sensor 144 is less than the first preset pressure range value, the controller will control the air pump to work, and the air pump will release gas to the inside of the gas chamber 141c through the inflation port 141a, so that the volume of the gas in the gas chamber 141c gradually increases, and under the action of pressure, the sliding member 142 gradually moves to the side away from the inflation port 141a, so that the volume of the gas chamber 141c gradually increases, and the volume of the connecting chamber 141d gradually decreases, and the sliding member 142 gradually squeezes the hydraulic oil in the connecting chamber 141d, thereby gradually increasing the pressure of the hydraulic oil in the connecting chamber 141d and the oil storage chamber 1432, so that the pressure value in the oil storage chamber 1432 meets the first preset pressure range value.

[0100] The pressure of the hydraulic oil in the oil storage chamber 1432 is measured in real time by the first pressure sensor 144. The controller can control the volume of gas released into the gas chamber 141c in the gas storage cylinder 141 according to the pressure value measured in real time by the first pressure sensor 144, so as to control the position of the sliding member 142 inside the storage chamber, adjust the volume of the gas chamber 141c and the connecting chamber 141d, and further adjust the pressure of the hydraulic oil in the connecting chamber 141d. If the hydraulic oil pressure in the oil storage chamber 1432 detected by the first pressure sensor 144 is less than the first preset pressure range value, the controller controls the release of gas into the gas chamber 141c to increase the volume of the gas chamber 141c and reduce the volume of the connecting chamber 141d, so that the sliding member 142 moves to the side away from the inflation port 141a, and the sliding member 142 is used to squeeze the hydraulic oil in the connecting chamber 141d, so that the pressure of the hydraulic oil in the connecting chamber 141d and the oil storage chamber 1432 gradually increases, so that the pressure of the hydraulic oil in the oil storage chamber 1432 is maintained within the first preset pressure range value.

[0101] When the injection molding machine is working, since the pressure of the hydraulic oil in the oil storage chamber 1432 is greater than the external pressure, a positive pressure is formed in the oil storage chamber 1432, thereby effectively preventing external air and impurities from entering the oil storage chamber 1432, improving the cleanliness of the hydraulic oil, and reducing the failure rate of the hydraulic system 100, thereby reducing maintenance time and cost.

[0102] In addition, the positive pressure environment in the oil storage chamber 1432 can also reduce the contact between the hydraulic oil and oxygen in the air, thereby reducing the oxidation rate and maintaining the stable performance of the hydraulic oil.

[0103] In addition, the air storage cylinder 141 and the oil storage cylinder 143 can effectively ensure the closedness of the hydraulic system 100, and improve the response speed and accuracy of the hydraulic system 100. Under the action of the first pressure sensor 144 and the controller, it can be ensured that the pressure of the hydraulic oil in the oil storage chamber 1432 can always maintain a stable oil supply pressure, ensuring that the injection molding machine can obtain sufficient hydraulic power in different working states.

[0104] Moreover, the present application can also ensure that the first oil pump 114 always sucks oil under a positive pressure environment through the action of the first pressure sensor 144 and the controller, thereby avoiding cavitation caused by excessively low pressure at the oil suction port of the first oil pump 114, protecting the first oil pump 114, and improving the reliability of the system.

[0105] The oil tank 140 in this solution can also provide stable hydraulic power for the high-speed injection molding machine, ensuring that the actuator 130 can quickly and accurately complete various actions, thereby improving production efficiency and product quality.

[0106] It is worth mentioning that the oil storage cylinder 143 can also balance the volume difference between the oil suction and oil discharge of the first oil pump 114, that is, when the oil suction of the first oil pump 114 is less than the return oil, the hydraulic oil enters the oil storage cylinder 143 for storage, pushing the sliding member 142 to move to the side close to the inflation port 141a; when the return oil is less than the suction oil, the oil storage cylinder 143 releases the hydraulic oil stored previously to make up for the shortage of hydraulic oil, thereby ensuring the stability and speed of the entire main hydraulic oil circuit.

[0107] In some embodiments of the present application, see Figure 2 As shown, the air storage cylinder 141 and the oil storage cylinder 143 can be arranged side by side up and down, or side by side left and right, as long as the air storage cylinder 141 and the oil storage cylinder 143 are connected to each other.

[0108] For example, please see Figure 2 As shown, the air storage cylinder 141 and the oil storage cylinder 143 are arranged side by side up and down, and the air storage cylinder 141 is arranged above the oil storage cylinder 143. When the oil storage cylinder 143 is arranged below the air storage cylinder 141, when the sliding member 142 squeezes the hydraulic oil in the communication chamber 141d, under the action of gravity, the hydraulic oil in the communication chamber 141d is more likely to flow from the top into the lower oil storage chamber 1432, so that the pressure of the hydraulic oil in the oil storage chamber 1432 is more likely to be maintained within the first preset pressure range.

[0109] In some embodiments of this application, please continue to refer to Figure 2 As shown, the gas storage cylinder 141 may include a cylinder barrel 1411. The cylinder barrel 1411 is a hollow structure, and the cylinder barrel 1411 may be a cylindrical structure, or may be other structures, such as a cuboid, an ellipsoid, and the like.

[0110] It should be noted that the sliding member 142 is disposed inside the cylinder tube 1411 and is in sealing contact with the inner wall of the cylinder tube 1411 .

[0111] In some embodiments of this application, please continue to refer to Figure 4 As shown, the gas storage cylinder 141 may further include a first cylinder cover 1412. The first cylinder cover 1412 is a square cover structure, and of course other types of cover structures may also be used, such as a triangular, circular, and other structures.

[0112] In some embodiments of the present application, the first cylinder head 1412 is disposed on one axial side of the cylinder barrel 1411 to seal one end of the cylinder barrel 1411. The first cylinder head 1412 has the above-mentioned charging port 141a disposed on its side wall, and the charging port 141a penetrates the first cylinder head 1412 in the axial direction of the cylinder barrel 1411, so that the inside of the cylinder barrel 1411 is connected to the outside through the charging port 141a.

[0113] It should be noted that a gas chamber 141 c is formed on one side of the sliding member 142 facing the first cylinder head 1412 , and the air pump can charge the gas into the gas chamber 141 c through the charging port 141 a .

[0114] In some embodiments of this application, please continue to refer to Figure 4 As shown, the gas storage cylinder 141 may further include a second cylinder cover 1413. The second cylinder cover 1413 is a square cover structure, and of course other types of cover structures may also be used, such as a triangular, circular, and other structures.

[0115] The second cylinder head 1413 is disposed on the other axial side of the cylinder barrel 1411 and is disposed opposite and parallel to the first cylinder head 1412. The second cylinder head 1413 seals the other side of the cylinder barrel 1411. The first cylinder head 1412 and the second cylinder head 1413 seal the cylinder barrel 1411 to form a storage chamber, wherein the side of the sliding member 142 facing the charging port 141a forms a gas chamber 141c, and the side of the sliding member 142 facing the second cylinder head 1413 forms a communication chamber 141d.

[0116] Please refer to Figure 4 As shown, an exhaust port 141b is provided on the top wall surface of the second cylinder head 1413 to discharge the gas in the hydraulic oil in the connecting chamber 141d or the oil storage chamber 1432, ensuring that the hydraulic oil is maintained within the first preset pressure range, ensuring the pressure of the hydraulic oil, and maintaining normal operation of the system.

[0117] The gas storage cylinder 141 in the present application adopts a segmented structure, which can be easier to install and disassemble during installation and maintenance. The segmented splicing structure can also simplify the processing difficulty and improve the equipment accuracy of the gas storage cylinder 141.

[0118] It is worth mentioning that the first cylinder head 1412 is provided with a first groove 14121 having the same shape as the longitudinal section of the cylinder barrel 1411 on one side facing the cylinder barrel 1411. That is, a circular first groove 14121 is hollowed out on one side of the first cylinder head 1412 facing the cylinder barrel 1411.

[0119] In some embodiments of this application, please continue to refer to Figure 4 As shown, an annular first mounting platform 14111 is provided on the outer wall of the cylinder barrel 1411 facing the first cylinder head 1412, and the distance between the outer wall surface of the first mounting platform 14111 and the axis center line of the cylinder barrel 1411 is smaller than the distance between the outer wall surface of the cylinder barrel 1411 and the axis center line of the cylinder barrel 1411, so as to ensure that the cylinder barrel 1411 can be effectively inserted into the first groove 14121 of the first cylinder head 1412. When one end of the cylinder barrel 1411 is inserted into the first groove 14121, the outer wall surface of the first mounting platform 14111 of the cylinder barrel 1411 abuts against the inner wall surface of the first groove 14121.

[0120] Accordingly, please continue to see Figure 4 As shown, the second cylinder head 1413 is provided with a second groove 14131 having the same shape as the longitudinal section of the cylinder barrel 1411 on one side facing the cylinder barrel 1411. That is, the second cylinder head 1413 is hollowed out on one side facing the cylinder barrel 1411 to provide a circular second groove 14131.

[0121] In some embodiments of this application, please continue to refer to Figure 4 As shown, an annular second mounting platform 14112 is provided on the outer wall of the cylinder barrel 1411 facing the second cylinder head 1413, and the distance from the outer wall surface of the second mounting platform 14112 to the axis center line of the cylinder barrel 1411 is smaller than the distance from the outer wall surface of the cylinder barrel 1411 to the axis center line of the cylinder barrel 1411, so as to ensure that the cylinder barrel 1411 can be effectively inserted into the second groove 14131 of the second cylinder head 1413, and when the other end of the cylinder barrel 1411 is inserted into the second groove 14131, the outer wall surface of the second mounting platform 14112 of the cylinder barrel 1411 abuts against the inner wall surface of the second groove 14131.

[0122] Please continue to see Figure 4 As shown, the diameter of the second groove 14131 is the same as the diameter of the first groove 14121 , and the cylinder barrel 1411 is effectively confined between the first cylinder head 1412 and the second cylinder head 1413 through the first cylinder head 1412 and the second cylinder head 1413 , thereby enhancing the sealing effect of the cylinder barrel 1411 .

[0123] In addition, the distance from the top wall of the first cylinder head 1412 to the axis of the cylinder barrel 1411 is greater than the distance from the outer wall of the cylinder barrel 1411 to the axis of the cylinder barrel 1411. The distance from the top wall of the second cylinder head 1413 to the axis of the cylinder barrel 1411 is greater than the distance from the outer wall of the cylinder barrel 1411 to the axis of the cylinder barrel 1411. By designing that the first cylinder head 1412 and the second cylinder head 1413 are higher than the cylinder barrel 1411, it is possible to prevent foreign objects from directly rubbing against the cylinder barrel 1411, thereby ensuring the integrity of the cylinder barrel 1411 and thus ensuring the sealing effect.

[0124] In some embodiments of this application, please continue to refer to Figure 4 As shown, the oil storage cylinder 143 can adopt the same structure as the gas storage cylinder 141, so that the gas storage cylinder 141 and the oil storage cylinder 143 can be stably arranged up and down to ensure overall stability.

[0125] In some embodiments of this application, please continue to refer to Figure 4 As shown, the oil storage cylinder 143 may include an oil cylinder barrel 1433. The oil cylinder barrel 1433 is a hollow structure, and the oil cylinder barrel 1433 may be a cylindrical structure. Of course, the oil cylinder barrel 1433 may also be other structures, such as a rectangular parallelepiped, an ellipsoid, and the like.

[0126] In some embodiments of this application, please continue to refer to Figure 4 As shown, the oil storage cylinder 143 may further include a first oil cylinder cover 1434. The first oil cylinder cover 1434 may have the same structure as the first cylinder cover 1412, or may have other structures. The first oil cylinder cover 1434 may be disposed at the bottom of the first cylinder cover 1412 and abut against the first cylinder cover 1412.

[0127] In some embodiments of this application, please continue to refer to Figure 4 As shown, the first oil cylinder cover 1434 is a square cover structure. Of course, other types of cover structures may also be used, such as triangular, circular, etc. structures.

[0128] In some embodiments of this application, please continue to refer to Figure 4 As shown, the first cylinder cover 1434 is arranged on one axial side of the cylinder barrel 1433 to seal one end of the cylinder barrel 1433. The side wall of the first cylinder cover 1434 is provided with the above-mentioned drain pipe 1431, which is connected to the inside of the cylinder barrel 1433 to extract the hydraulic oil inside the cylinder barrel 1433.

[0129] In some embodiments of this application, please continue to refer to Figure 4As shown, the oil storage cylinder 143 may further include a second oil cylinder cover 1435. The second oil cylinder cover 1435 may have the same structure as the second cylinder cover 1413, or may have other structures. The second oil cylinder cover 1435 may be disposed at the bottom of the second cylinder cover 1413 and abut against the second cylinder cover 1413.

[0130] In some embodiments of this application, please continue to refer to Figure 4 As shown, the second oil cylinder cover 1435 is a square cover structure, and of course other types of cover structures can also be used, such as triangular, circular, etc. The second oil cylinder cover 1435 is arranged on the other axial side of the oil cylinder barrel 1433, and is arranged opposite to and parallel to the first oil cylinder cover 1434. The second oil cylinder cover 1435 seals the other side of the oil cylinder barrel 1433.

[0131] Please note that, see Figure 2 and Figure 4 As shown, a first pressure sensor 144 is provided on the side wall surface of the second cylinder cover 1435. The first pressure sensor 144 is used to detect the pressure value of the hydraulic oil inside the cylinder barrel 1433 and can transmit a signal to the controller in real time to ensure that the hydraulic oil inside the cylinder barrel 1433 remains within a first preset pressure range.

[0132] The oil storage cylinder 143 in the present application adopts a segmented structure, which can be easier to install and disassemble during installation and maintenance. The segmented splicing structure can also simplify the processing difficulty and improve the equipment accuracy of the oil storage cylinder 143.

[0133] It is worth mentioning that please continue to see Figure 4 As shown, the first cylinder cover 1434 is provided with a third groove 14341 having the same shape as the longitudinal section of the cylinder barrel 1433 on one side thereof facing the cylinder barrel 1433. That is, the first cylinder cover 1434 is provided with a circular third groove 14341 on one side thereof facing the cylinder barrel 1433.

[0134] In some embodiments of this application, please continue to refer to Figure 4 As shown, an annular third mounting platform 14331 is provided on the outer wall of the oil cylinder barrel 1433 facing the first oil cylinder cover 1434, and the distance between the outer wall surface of the third mounting platform 14331 and the axis of the oil cylinder barrel 1433 is smaller than the distance between the outer wall surface of the oil cylinder barrel 1433 and the axis of the oil cylinder barrel 1433, so as to ensure that the oil cylinder barrel 1433 can be effectively inserted into the third groove 14341 of the first oil cylinder cover 1434. When one end of the oil cylinder barrel 1433 is inserted into the third groove 14341, the outer wall surface of the third mounting platform 14331 of the oil cylinder barrel 1433 abuts against the inner wall surface of the third groove 14341.

[0135] Accordingly, please continue to see Figure 4As shown, the second cylinder cover 1435 is provided with a fourth groove 14351 having the same shape as the longitudinal section of the cylinder barrel 1433 on one side thereof facing the cylinder barrel 1433. That is, the second cylinder cover 1435 is provided with a fourth circular groove 14351 on one side thereof facing the cylinder barrel 1433.

[0136] In some embodiments of this application, please continue to refer to Figure 4 As shown, a fourth annular mounting platform 14332 is provided on the outer wall of the oil cylinder barrel 1433 on the side facing the second oil cylinder cover 1435. The distance from the outer wall surface of the fourth mounting platform 14332 to the axis of the oil cylinder barrel 1433 is smaller than the distance from the outer wall surface of the oil cylinder barrel 1433 to the axis of the oil cylinder barrel 1433, so as to ensure that the oil cylinder barrel 1433 can be effectively inserted into the fourth groove 14351 of the second oil cylinder cover 1435. When the other end of the oil cylinder barrel 1433 is inserted into the fourth groove 14351, the outer wall surface of the fourth mounting platform 14332 of the oil cylinder barrel 1433 abuts against the inner wall surface of the fourth groove 14351.

[0137] Among them, the diameter of the fourth groove 14351 is the same as the diameter of the third groove 14341. The first cylinder cover 1434 and the second cylinder cover 1435 effectively restrict the cylinder barrel 1433 between the first cylinder cover 1434 and the second cylinder cover 1435, thereby enhancing the sealing effect of the cylinder barrel 1433.

[0138] In addition, the distance from the top wall of the first oil cylinder cover 1434 to the axis of the oil cylinder barrel 1433 is greater than the distance from the outer wall of the oil cylinder barrel 1433 to the axis of the oil cylinder barrel 1433. The distance from the top wall of the second oil cylinder cover 1435 to the axis of the oil cylinder barrel 1433 is greater than the distance from the outer wall of the oil cylinder barrel 1433 to the axis of the oil cylinder barrel 1433. By designing that the first oil cylinder cover 1434 and the second oil cylinder cover 1435 are higher than the oil cylinder barrel 1433, it is possible to prevent foreign objects from directly rubbing against the oil cylinder barrel 1433, thereby ensuring the integrity of the oil cylinder barrel 1433 and further ensuring the sealing effect.

[0139] The first cylinder head 1434 and the second cylinder head 1435 are used to seal the axial ends of the cylinder barrel 1433, so that the first cylinder head 1434, the second cylinder head 1435 and the cylinder barrel 1433 can be used as an oil storage chamber 1432 for storing hydraulic oil, which can prevent the hydraulic oil from contacting with foreign substances, ensure the cleanliness of the hydraulic oil, reduce the failure rate of the hydraulic system 100, and reduce maintenance time and cost.

[0140] It is worth mentioning that the oil storage cylinder 143 and the gas storage cylinder 141 adopt the same structure, which can improve the stability between the gas storage cylinder 141 and the oil storage cylinder 143 when the gas storage cylinder 141 and the oil storage cylinder 143 are arranged side by side up and down.

[0141] It is worth mentioning that please continue to see Figure 4 As shown, the air storage cylinder 141 and the oil storage cylinder 143 can be fixed by fasteners 145 such as bolts.

[0142] For example, the gas storage cylinder 141 and the oil storage cylinder 143 are fixed at their connection points by fasteners 145 such as bolts.

[0143] In some embodiments of the present application, the bottom wall of the second cylinder head 1413 is provided with a first opening (not shown in the figure) communicating with the communication chamber 141d.

[0144] In some embodiments of the present application, the top wall of the second oil cylinder cover 1435 is provided with a second opening (not shown in the figure) communicating with the oil storage chamber 1432, and the second opening corresponds to the first opening. The oil storage chamber 1432 is communicated with the communication chamber 141d through the second opening and the first opening, so that when the sliding member 142 squeezes the hydraulic oil in the communication chamber 141d, it can generate a squeezing force on the hydraulic oil in the oil storage chamber 1432, increase the pressure of the hydraulic oil, ensure that the hydraulic oil is maintained within the first preset pressure range, provide a positive pressure environment for the hydraulic oil, ensure the cleanliness of the hydraulic oil, reduce the oxidation rate of the hydraulic oil, and improve the response speed and accuracy of the system.

[0145] In some embodiments of this application, please continue to refer to Figure 4 As shown, the second cylinder head 1413 is further provided with a fifth groove 14132. The fifth groove 14132 is provided on a side of the second groove 14131 away from the sliding member 142, and the diameter of the fifth groove 14132 is smaller than the diameter of the second groove 14131. The fifth groove 14132 is connected with the first opening and the second opening, and the fifth groove 14132 can be used to buffer part of the hydraulic oil.

[0146] It should be noted that the diameter of the fifth groove 14132 is the same as the diameter of the inner wall of the cylinder barrel 1411 to ensure that the sliding member 142 can slide into the second cylinder head 1413 to further squeeze the hydraulic oil to ensure that the hydraulic oil can be within the first preset pressure range.

[0147] In some embodiments of this application, please continue to refer to Figure 2 As shown, the oil tank 140 may further include a first connecting member 146. One end of the first connecting member 146 is connected to the first cylinder head 1412, and the other end is connected to the second cylinder head 1413, and the first connecting member 146 is disposed outside the cylinder barrel 1411.

[0148] That is, please continue to see Figure 2As shown, the first connecting member 146 is extended in the axial direction of the cylinder barrel 1411, and the first connecting member 146 is used to fix the first cylinder head 1412, the cylinder barrel 1411 and the second cylinder head 1413 together, thereby ensuring the tightness of the connection between the first cylinder head 1412, the cylinder barrel 1411 and the second cylinder head 1413, improving the sealing effect of the storage chamber, and avoiding air leakage or oil leakage.

[0149] Please refer to Figure 2 As shown, the first connecting member 146 and the first cylinder head 1412 and the second cylinder head 1413 may be connected by threads or by other means, such as snap-fitting, welding, etc.

[0150] In some embodiments of this application, please continue to refer to Figure 2 As shown, one end of the first connecting member 146 passes through the first cylinder head 1412 , and the portion of the first connecting member 146 passing through the first cylinder head 1412 is threadedly connected by a nut to connect the first connecting member 146 and the first cylinder head 1412 together.

[0151] Accordingly, please continue to see Figure 2 As shown, the other end of the first connecting member 146 also passes through the second cylinder head 1413, and the portion of the first connecting member 146 passing through the second cylinder head 1413 is threadedly connected using a nut to connect the first connecting member 146 and the second cylinder head 1413 together.

[0152] That is, the first cylinder head 1412 , the cylinder barrel 1411 and the second cylinder head 1413 are fixed as a whole through the nut and the first connecting member 146 , thereby improving the overall stability of the gas storage cylinder 141 .

[0153] In some embodiments of this application, please continue to refer to Figure 2 As shown, the oil tank 140 may further include a second connecting member 147. One end of the second connecting member 147 is connected to the first oil cylinder cover 1434, and the other end is connected to the second oil cylinder cover 1435, and the second connecting member 147 is disposed outside the oil cylinder barrel 1433.

[0154] That is, the second connecting member 147 is extended in the axial direction of the cylinder barrel 1433, and the first cylinder head 1434, the cylinder barrel 1433 and the second cylinder head 1435 are fixed together by the second connecting member 147, so as to ensure the tightness of the connection between the first cylinder head 1434, the cylinder barrel 1433 and the second cylinder head 1435, improve the sealing effect of the oil storage chamber 1432, and avoid oil leakage.

[0155] It should be noted that the second connecting member 147 and the first cylinder cover 1434 and the second cylinder cover 1435 may be connected by threads or by other means, such as snap-fit, welding, etc.

[0156] In some embodiments of this application, please continue to refer to Figure 2 As shown, one end of the second connecting member 147 passes through the first cylinder cover 1434, and the portion of the second connecting member 147 passing through the first cylinder cover 1434 is threadedly connected by a nut to connect the second connecting member 147 and the first cylinder cover 1434 together.

[0157] Accordingly, please continue to see Figure 2 As shown, the other end of the second connecting member 147 also passes through the second cylinder cover 1435, and the portion of the second connecting member 147 passing through the second cylinder cover 1435 is threadedly connected using a nut to connect the second connecting member 147 and the second cylinder cover 1435 together.

[0158] That is, the first oil cylinder cover 1434 , the oil cylinder barrel 1433 and the second oil cylinder cover 1435 are fixed as a whole through the nut and the second connecting member 147 , thereby improving the overall stability of the oil storage cylinder 143 .

[0159] In some embodiments of this application, please continue to refer to Figure 2 As shown, the gas storage cylinder 141 is provided with a plurality of first connecting members 146. The plurality of first connecting members 146 are arranged around the cylinder barrel 1411, and the plurality of first connecting members 146 can improve the stability of the gas storage cylinder 141, prevent the gas storage cylinder 141 from shaking, and ensure the sealing effect of the gas storage cylinder 141.

[0160] For example, please see Figure 2 As shown, four first connecting members 146 are provided on the gas storage cylinder 141 , and the four first connecting members 146 are respectively provided at four corners of the first cylinder head 1412 and the second cylinder head 1413 to ensure the stability of the gas storage cylinder 141 .

[0161] In some embodiments of this application, please continue to refer to Figure 2 As shown, the oil storage cylinder 143 is provided with a plurality of second connecting members 147. The plurality of second connecting members 147 are arranged around the oil cylinder barrel 1433, and the plurality of second connecting members 147 can improve the stability of the oil storage cylinder 143, prevent the oil storage cylinder 143 from shaking, and ensure the sealing effect of the oil storage cylinder 143.

[0162] For example, please see Figure 2 As shown, four second connecting members 147 are provided on the oil storage cylinder 143 , and the four second connecting members 147 are respectively provided at four corners of the first oil cylinder cover 1434 and the second oil cylinder cover 1435 to ensure the stability of the oil storage cylinder 143 .

[0163] It can be understood that the first connecting member 146 and the second connecting member 147 can adopt the same structure, such as a cylindrical rod-shaped structure.

[0164] In some embodiments of this application, please continue to refer to Figure 4 As shown, the sliding member 142 may include a piston 1421 and a sealing member 1422. The sealing member 1422 is arranged around the outer edge of the piston 1421, and the piston 1421 is sealedly connected to the inner wall of the cylinder barrel 1411 through the sealing member 1422 to prevent the gas in the gas chamber 141c and the hydraulic oil in the connecting chamber 141d from flowing mutually, thereby ensuring the sealing of the gas chamber 141c and the connecting chamber 141d.

[0165] It should be noted that after the piston 1421 is placed inside the cylinder barrel 1411, it can be inflated into the gas chamber 141c through the inflation port 141a, so that the piston 1421 can move to the second cylinder head 1413. During operation, the hydraulic oil in the oil storage chamber 1432 will push the piston 1421 to move to the side close to the inflation port 141a, so that a connecting chamber 141d is formed between the piston 1421 and the second cylinder head 1413, and a dynamic balance is maintained between the gas chamber 141c and the connecting chamber 141d. Then, the controller can adjust the pressure in the gas chamber 141c according to the pressure signal detected by the first pressure sensor 144, adjust the position of the piston 1421 in the storage chamber, and then adjust the pressure range of the hydraulic oil to ensure that the hydraulic oil in the oil storage chamber 1432 is maintained in a positive pressure environment.

[0166] In some embodiments of this application, please continue to refer to Figure 4 As shown, the oil storage cylinder 143 further includes a filter 1436 disposed inside the oil storage chamber 1432. The filter 1436 is disposed on the side of the oil discharge pipe 1431 away from the first oil pump 114, that is, when the first oil pump 114 extracts the hydraulic oil in the oil storage chamber 1432, the hydraulic oil is filtered in advance by the filter 1436 and then discharged into the first oil pump 114 through the oil discharge pipe 1431, and finally enters the hydraulic system 100 to work, thereby ensuring the cleanliness of the hydraulic oil entering the hydraulic system 100, reducing the failure rate of the hydraulic system 100, and thus reducing maintenance time and cost.

[0167] In some embodiments of this application, please continue to refer to Figure 2 As shown, a needle valve 148 is also provided on the top wall of the second cylinder head 1413. The needle valve 148 can cooperate with the oil port on the second cylinder head 1413 to allow oil to enter or drain into the communicating chamber 141d and the oil storage chamber 1432.

[0168] Figure 5The figure shows a connection structure diagram between the oil replenishing mechanism and the oil tank 0 provided in the embodiment of the present application.

[0169] In some embodiments of the present application, the pipeline connecting the first oil outlet 114b of the first oil pump 114 and the second oil inlet 120a of the control valve group 120 is an oil inlet pipeline (not shown in the figure), and the pipeline connecting the third oil outlet 120d of the control valve group 120 and the fifth oil inlet 140c of the oil tank 140 is an oil outlet pipeline (not shown in the figure).

[0170] In some embodiments of this application, see Figure 5 As shown, the hydraulic system 100 further includes a first pressure detection device 160. The first pressure detection device 160 is disposed on the oil inlet pipeline. The first pressure detection device 160 is connected to the controller and can be used to detect the pressure value on the oil inlet pipeline.

[0171] In some embodiments of this application, please continue to refer to Figure 5 As shown, the hydraulic system 100 further includes a first relief valve 170. One end of the first relief valve 170 is communicated with the oil inlet pipeline, and the other end is communicated with the oil outlet pipeline.

[0172] The controller can open or close the first relief valve 170 according to the pressure value detected by the first pressure detection device 160 to relieve the pressure of the hydraulic oil in the oil inlet pipeline.

[0173] For example, when the pressure value detected by the first pressure detection device 160 is greater than the second preset pressure range value in the controller, the controller controls the first relief valve 170 to open, and the hydraulic oil at the first oil outlet 114b falls back to the fifth oil inlet 140c of the oil tank 140, thereby reducing the pressure on the oil inlet pipeline. When the pressure value detected by the first pressure detection device 160 meets the second preset pressure range value, the controller controls the first relief valve 170 to close, and the hydraulic oil at the first oil outlet 114b is pumped into the control valve group 120.

[0174] It should be noted that the second relief valve 190 can prevent the hydraulic oil in the connecting pipeline from being over-pressurized, play a role of constant pressure relief, and play a role of safety protection for the hydraulic system 100 in stabilizing pressure and unloading.

[0175] In some embodiments of this application, please continue to refer to Figure 5 As shown, the oil replenishment mechanism 150 includes an oil replenishment tank 151 , a first oil pumping assembly 152 , a first control valve 153 and a second control valve 154 .

[0176] Please continue to see Figure 5As shown, the oil replenishment tank 151 is used to store hydraulic oil. The oil suction port of the first oil pumping assembly 152 is connected to the oil replenishment tank 151, and the first oil pumping assembly 152 includes a second motor 1520 and a second oil pump 1521, and the second motor 1520 is connected to the second oil pump 1521, and the second motor 1520 can drive the second oil pump 1521 to pump the hydraulic oil at the oil replenishment tank 151 into the oil tank 140.

[0177] It should be noted that the second motor 1520 may be a servo motor or other types of motors.

[0178] In addition, please continue to see Figure 5 As shown, the connecting pipeline between the oil outlet of the second oil pump 1521 and the oil replenishment inlet 140a of the oil tank 140 is an oil replenishment pipeline, and a first control valve 153 is provided on the oil replenishment pipeline. When the second oil pump 1521 extracts hydraulic oil from the oil replenishment tank 151, the first control valve 153 opens to replenish oil into the oil tank 140.

[0179] It is worth mentioning that please continue to see Figure 5 As shown, a second pressure detection device 180 is also provided on the oil replenishment pipeline. The second pressure detection device 180 is used to detect the pressure of the hydraulic oil in the oil replenishment pipeline. The second pressure detection device 180 includes a pressure gauge 181 and a second pressure sensor 182. The pressure gauge 181 is used to display the pressure of the hydraulic oil in the oil replenishment pipeline, and the second pressure sensor 182 is used to detect the pressure of the hydraulic oil in the oil replenishment pipeline, and convert the detected pressure signal into an electrical signal and transmit it to the controller.

[0180] Please continue to see Figure 5 As shown, a second overflow valve 190 is further provided on the oil replenishment pipeline, a first end of the second overflow valve 190 is communicated with the oil outlet of the second oil pump 1521 , and a second end of the second overflow valve 190 is communicated with the oil replenishment tank 151 .

[0181] The controller may determine whether to open the second relief valve 190 according to the pressure signal detected by the second pressure sensor 182 .

[0182] For example, when the hydraulic oil pressure at the oil outlet of the second oil pump 1521 is greater than a preset range, the controller controls the second overflow valve 190 to open, and the hydraulic oil at the oil outlet of the second oil pump 1521 is discharged into the replenishing oil tank 151, thereby reducing the pressure of the hydraulic oil at the oil outlet of the second oil pump 1521 to protect the compensation oil circuit.

[0183] It should be noted that the second relief valve 190 can prevent the hydraulic oil in the connecting pipeline from being over-pressurized, play a role of constant pressure relief, and play a role of safety protection for the hydraulic system 100 in stabilizing pressure and unloading.

[0184] In some embodiments of this application, please continue to refer to Figure 5 As shown, the oil replenishing mechanism 150 further includes a filter 155, which is disposed on the connecting pipeline between the first oil pump assembly 152 and the oil replenishing tank 151, that is, the filter 155 is disposed on the connecting pipeline between the oil suction port of the second oil pump 1521 and the oil replenishing tank 151. The filter 155 can remove impurities in the hydraulic oil to ensure the purity of the hydraulic oil, thereby ensuring the working stability of the hydraulic system 100.

[0185] In some embodiments of this application, please continue to refer to Figure 5 As shown, the oil replenishing mechanism 150 also includes a solenoid valve 156. The first end of the first control valve 153 is connected to the oil replenishing inlet 140a of the oil tank 140, the second end of the first control valve 153 is connected to the first end of the solenoid valve 156, and the second end of the solenoid valve 156 is connected to the oil outlet of the second oil pumping assembly. That is, the solenoid valve 156 is arranged between the first control valve 153 and the second oil pumping assembly. The solenoid valve 156 is electrically connected to the controller, that is, the controller can control the opening and closing of the solenoid valve 156 according to the pressure signal detected by the first pressure sensor 144, so as to realize the replenishing tank 151 replenishing oil to the oil tank 140 or shutting off the connecting pipeline between the replenishing tank 151 and the oil tank 140.

[0186] In some embodiments of this application, please continue to refer to Figure 5 As shown, the oil replenishing mechanism 150 further includes a third overflow valve 157. The first end of the second control valve 154 is communicated with the oil drain port 140d of the oil tank 140, the second end of the second control valve 154 is communicated with the first end of the third overflow valve 157, and the second end of the third overflow valve 157 is communicated with the oil replenishing tank 151. The hydraulic oil in the oil tank 140 can be leaked into the oil replenishing tank 151 through the second control valve 154 and the third overflow valve 157.

[0187] In some embodiments of this application, please continue to refer to Figure 5 As shown, the first control valve 153 and the second control valve 154 are one-way valves. The first control valve 153 allows the hydraulic oil to flow from the replenishing tank 151 to the oil tank 140, while restricting the hydraulic oil in the oil tank 140 from flowing back to the replenishing tank 151. The second control valve 154 allows the hydraulic oil to flow from the oil drain port 140d of the oil tank 140 to the sixth oil inlet port 150a of the replenishing tank 151, while restricting the hydraulic oil in the replenishing tank 151 from flowing back to the oil tank 140. By setting the first control valve 153 and the second control valve 154 as one-way valves, a closed oil supply can be formed between the oil supply mechanism and the oil tank 140, reducing the contact between the hydraulic oil and the air, improving the cleanliness of the hydraulic oil, and avoiding the shutdown of the oil supply, so that the injection molding machine can continue to produce.

[0188] In some embodiments of this application, please continue to refer to Figure 1As shown, the hydraulic system 100 further includes a cooling member 1100. The cooling member 1100 may be a cooler, and the cooling member 1100 is provided with a seventh oil inlet 1100a and a seventh oil outlet 1100b, wherein the seventh oil inlet 1100a is communicated with the third oil outlet 120d of the control valve group 120, and the seventh oil outlet 1100b is communicated with the fifth oil inlet 140c of the oil tank 140. The hydraulic oil after working in the actuator 130 is cooled by the cooling member 1100 to prevent the hydraulic oil from being deteriorated due to excessive temperature.

[0189] This application solution has at least the following technical effects:

[0190] The present application enables the hydraulic oil to work in a closed environment through the power mechanism 110, the control valve group 120, the actuator 130, the oil tank 140 and the oil replenishment mechanism 150, thereby preventing the hydraulic oil from being polluted, reducing energy loss, and further reducing the energy consumption of the injection molding machine, thereby improving the stability and service life of the hydraulic system 100. The oil replenishment mechanism 150 can also effectively provide automatic closed oil supply to the oil tank 140, avoiding the need to stop the machine to supply oil to the oil tank 140, saving oil supply time, simplifying operation, ensuring that the hydraulic system 100 can continue to be in a working environment, improving production efficiency, and making the entire hydraulic system 100 more stable and fast.

[0191] In addition, the oil tank 140 can ensure that the hydraulic oil inside the oil storage cylinder 143 is maintained in a positive pressure environment through the air storage cylinder 141, the oil storage cylinder 143, the sliding part 142, the pressure sensor and the controller, that is, the pressure inside the oil storage chamber 1432 is greater than the external environmental pressure, which can effectively prevent external dust, water vapor or other impurities from entering the oil storage chamber 1432, thereby improving the cleanliness and stability of the hydraulic oil, reducing the failure rate of the hydraulic system 100, and thus reducing maintenance time and cost.

[0192] Maintaining a positive pressure environment inside the oil storage chamber 1432 can also reduce the contact between the hydraulic oil and oxygen in the air, thereby reducing the oxidation rate of the hydraulic oil and ensuring the stable performance of the hydraulic oil.

[0193] Maintaining a positive pressure environment inside the oil storage chamber 1432 can also maintain a stable oil supply pressure, ensuring that the injection molding machine can obtain sufficient hydraulic power under different working conditions. Providing a stable oil supply pressure can ensure consistency and reliability during the injection molding stage and reduce defects in the product.

[0194] Maintaining a positive pressure environment inside the oil storage chamber 1432 can also keep the pressure at the oil pump suction port positive, avoid cavitation, protect the oil pump or other key components, and improve the reliability of the entire system.

[0195] In addition, the entire hydraulic circuit of the hydraulic oil is in a closed loop, which can improve the response speed and accuracy of the entire system.

[0196] The oil tank 140 can also provide stable hydraulic power for the high-speed injection molding machine, ensuring that it can quickly and accurately complete various actions, thereby improving production efficiency and product quality.

[0197] In the description of this specification, the description with reference to the terms "some embodiments", "exemplarily", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0198] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application. Therefore, any changes or modifications made in accordance with the claims and description of the present application should fall within the scope of the patent of this application.

Claims

1. A hydraulic system, characterized in that: include: The power mechanism is provided with a first oil inlet and a first oil outlet; A control valve group, comprising a second oil inlet, a third oil inlet, a second oil outlet and a third oil outlet, wherein the second oil inlet is connected to the first oil outlet; The actuator is provided with a fourth oil inlet and a fourth oil outlet, wherein the fourth oil inlet is communicated with the second oil outlet, and the fourth oil outlet is communicated with the third oil inlet; An oil tank, provided with an oil replenishment inlet, a fifth oil inlet, a fifth oil outlet and an oil drain, wherein the fifth oil inlet is communicated with the third oil outlet, and the fifth oil outlet is communicated with the first oil inlet; The oil replenishing mechanism is provided with a sixth oil inlet and a sixth oil outlet, the sixth oil inlet is communicated with the oil drain port, and the sixth oil outlet is communicated with the oil replenishing inlet; Among them, the power mechanism can draw the hydraulic oil in the oil tank into the control valve group, and release the hydraulic oil to the actuator through the control valve group, so that the actuator completes injection molding, and the hydraulic oil passing through the actuator structure flows back to the oil tank, and the oil replenishing mechanism can replenish the hydraulic oil into the oil tank.

2. The hydraulic system according to claim 1, characterized in that: The hydraulic system further comprises a controller; the oil tank comprises: An air storage cylinder, wherein the air storage cylinder is provided with an air charging port, an air exhaust port, and a storage chamber arranged inside the air storage cylinder, and the storage chamber is connected to the outside through the air charging port / the air exhaust port; a sliding member, disposed inside the storage chamber and sealedly connected to the inner wall of the storage chamber, the sliding member dividing the storage chamber into a gas chamber and a communication chamber, the gas chamber being connected to the outside through the inflation port, and the communication chamber being connected to the outside through the exhaust port; An oil storage cylinder is arranged side by side with the gas storage cylinder, the oil storage cylinder is provided with an oil discharge pipe and an oil storage chamber for storing hydraulic oil, the oil storage chamber is communicated with the first oil inlet of the power mechanism through the oil discharge pipe, the oil storage chamber is provided with the oil replenishment inlet, and the oil storage chamber is communicated with the communication chamber; A first pressure sensor is arranged outside the oil storage cylinder, and the first pressure sensor can detect the pressure value of the hydraulic oil inside the oil storage chamber; Among them, the controller can control the volume of gas released into the gas chamber according to the hydraulic oil pressure value detected by the first pressure sensor, so as to control the position of the sliding member inside the storage chamber, so as to adjust the volume size of the gas chamber and the connecting chamber.

3. The hydraulic system according to claim 2, characterized in that: The gas storage cylinder and the oil storage cylinder are arranged side by side up and down.

4. The hydraulic system according to claim 3, characterized in that: The gas storage cylinder comprises: A first cylinder head, provided with the charging port; a second cylinder head, opposite to and spaced from the first cylinder head, the second cylinder head being provided with the exhaust port; A cylinder barrel, the cylinder barrel is a hollow structure, opposite ends of the cylinder barrel are respectively connected to the first cylinder head and the second cylinder head, and form the storage chamber with the first cylinder head and the second cylinder head; The sliding member is arranged inside the cylinder barrel and sealed with the inner wall of the cylinder barrel, the sliding member and one side of the second cylinder head form the connecting chamber, and the sliding member and one side of the first cylinder head form the gas chamber.

5. The hydraulic system according to claim 4, characterized in that: The oil storage cylinder comprises: a first oil cylinder cover, arranged below the first cylinder cover and abutting against the first cylinder cover, the first oil cylinder cover being provided with the oil drain pipe; a second oil cylinder head, opposite to and spaced from the first oil cylinder head, and the second oil cylinder head is arranged below and abuts against the second oil cylinder head, and the first pressure sensor is arranged on the second oil cylinder head and communicated with the oil storage chamber; The oil cylinder barrel is a hollow structure, and the opposite ends of the oil cylinder barrel are respectively connected to the first oil cylinder head and the second oil cylinder head, and form the oil storage cavity with the first oil cylinder head and the second oil cylinder head.

6. The hydraulic system according to claim 5, characterized in that: The fuel tank also includes: a first connecting member, one end of which is connected to the first cylinder head, and the other end of which is connected to the second cylinder head; A second connecting member, one end of which is connected to the first oil cylinder cover, and the other end of which is connected to the second oil cylinder cover.

7. The hydraulic system according to claim 2, characterized in that: The oil storage cylinder further comprises a filter element arranged inside the oil storage cavity, and the filter element is connected to a side of the oil drain pipe away from the power mechanism.

8. The hydraulic system according to claim 2, characterized in that: The oil replenishing mechanism comprises: Filling the fuel tank; a first oil pump assembly, wherein an oil suction port of the first oil pump assembly is communicated with the oil replenishment tank, and an oil outlet of the first oil pump assembly is communicated with the oil replenishment inlet; a first control valve, the first control valve being arranged on a connecting pipeline between an oil outlet of the first oil pump assembly and the oil replenishment inlet; A second control valve is provided on the connecting pipeline between the oil drain port and the sixth oil inlet; The controller can control the first oil pumping assembly to be in an operating state or a stopping state based on the pressure value detected by the first pressure sensor.

9. The hydraulic system according to claim 8, characterized in that: The first control valve and the second control valve are one-way valves; Among them, the first control valve allows the hydraulic oil to flow from the oil outlet of the first pump oil assembly to the oil replenishment inlet of the oil tank; the second control valve allows the hydraulic oil to flow from the oil drain port to the sixth oil inlet of the oil replenishment tank.

10. The hydraulic system according to claim 1, characterized in that: The hydraulic system further comprises a cooling element, wherein the cooling element is provided with a seventh oil inlet and a seventh oil outlet, wherein the seventh oil inlet is communicated with the third oil outlet of the control valve group, and the seventh oil outlet is communicated with the fifth oil inlet of the oil tank.

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