Hydraulic system

Abstract

The utility model 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 application belongs to the technical field of injection molding machines, and particularly relates to a hydraulic system. BACKGROUND

[0002] The injection molding machine is also known as 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 and the like. Among them, the hydraulic system provides power for various actions required by the process of the injection molding machine, 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. After long-time work, the open system will cause the hydraulic oil to be contaminated, resulting in the problems of increased energy consumption of the injection molding machine equipment and decreased efficiency of the injection molding machine equipment. CONTENT OF THE INVENTION

[0004] The application aims to solve the problems of the existing technology, i.e., the open system causes the hydraulic oil to be contaminated, resulting in the problems of increased energy consumption of the injection molding machine equipment and decreased efficiency of the injection molding machine equipment.

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

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

[0007] a control valve group provided with a second oil inlet, a third oil inlet, a second oil outlet and a third oil outlet, wherein the second oil inlet is in communication with the first oil outlet;

[0008] an actuator provided with a fourth oil inlet and a fourth oil outlet, wherein the fourth oil inlet is in communication with the second oil outlet, and the fourth oil outlet is in communication with the third oil inlet;

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

[0010] a replenishment mechanism provided with a sixth oil inlet and a sixth oil outlet, wherein the sixth oil inlet is in communication with the drain outlet, and the sixth oil outlet is in communication with the replenishment oil inlet;

[0011] The power mechanism can draw hydraulic oil in the oil tank into the control valve group and release the hydraulic oil to the actuating mechanism through the control valve group, so that the actuating mechanism completes injection molding, and the hydraulic oil passing through the actuating mechanism returns to the oil tank, and the oil supplementing mechanism can supplement the hydraulic oil to the oil tank.

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

[0013] The gas storage cylinder is provided with a gas inlet, a gas outlet and a storage chamber in the interior of the gas storage cylinder, and the storage chamber is in communication with the outside through the gas inlet / gas outlet;

[0014] The sliding member is arranged in the interior of the storage chamber and is in sealing connection with the inner wall of the storage chamber, and the sliding member divides the storage chamber into a gas chamber and a communication chamber, the gas chamber is in communication with the outside through the gas inlet, and the communication chamber is in communication with the outside through the gas outlet;

[0015] The oil storage cylinder is arranged side by side with the gas storage cylinder, and the oil storage cylinder is provided with an oil outlet pipe and an oil storage chamber for storing hydraulic oil, the oil storage chamber is in communication with the first oil inlet of the power mechanism through the oil outlet pipe, the oil storage chamber is provided with the oil supplement inlet, and the oil storage chamber is in communication with the communication chamber;

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

[0017] The controller can control the volume of the gas released into the gas chamber according to the pressure value of the hydraulic oil detected by the first pressure sensor, control the position of the sliding member in the interior of the storage chamber, and adjust the volume of the gas chamber and the communication chamber.

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

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

[0020] The first cylinder cover is provided with the gas inlet;

[0021] The second cylinder cover is arranged opposite to and spaced apart from the first cylinder cover, and the second cylinder cover is provided with the gas outlet;

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

[0023] The sliding member is arranged inside the cylinder barrel and is in sealing connection with the inner wall of the cylinder barrel, and forms the communication chamber with one side of the second cylinder cover and forms the gas chamber with one side of the first cylinder cover.

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

[0025] A first oil cylinder cover is arranged below the first cylinder cover and abuts against the first cylinder cover, and the first oil cylinder cover is provided with the oil discharge pipe;

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

[0027] An oil cylinder barrel, which is a hollow structure, and whose opposite ends are connected with the first and second oil cylinder covers respectively and form the oil storage chamber with the first and second oil cylinder covers.

[0028] In an exemplary embodiment of the present application, the oil tank further comprises:

[0029] A first connecting member, one end of which is connected with the first cylinder cover and the other end of which is connected with the second cylinder cover;

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

[0031] In an exemplary embodiment of the present application, the oil storage cylinder further comprises a filter arranged inside the oil storage chamber, and the filter is connected with the side of the oil discharge pipe away from the power mechanism.

[0032] In an exemplary embodiment of the present application, the oil supplementing mechanism comprises:

[0033] An oil supplementing tank;

[0034] A first oil pumping assembly, the oil suction port of which communicates with the oil supplementing tank, and the oil discharge port of which communicates with the oil supplementing inlet;

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

[0036] a second control valve arranged on a connecting pipeline between the oil drain and the sixth oil inlet;

[0037] The controller can control the first pump oil assembly to be in an operating state or a shutdown 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] The first control valve allows hydraulic oil to flow from the oil outlet of the first pump oil assembly to the oil supplement inlet of the oil tank, and the second control valve allows the hydraulic oil to flow from the oil drain to the sixth oil inlet of the oil tank.

[0040] In an exemplary embodiment of the present application, the hydraulic system further comprises a cooling member provided with a seventh oil inlet and a seventh oil outlet, the seventh oil inlet being in communication with the third oil outlet of the control valve group, and the seventh oil outlet being in communication with the fifth oil inlet of the oil tank.

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

[0042] The power mechanism, the control valve group, the actuator, the oil tank and the oil supplement mechanism of the present application enable the hydraulic oil to work in a closed environment, prevent the hydraulic oil from being contaminated, reduce energy loss, and thus reduce the energy consumption of the injection molding machine and improve the stability and service life of the hydraulic system. The oil supplement mechanism can also effectively provide automatic closed oil supply for the oil tank, reduce the contamination of the hydraulic oil, improve the cleanliness of the hydraulic oil, and avoid supplying oil to the oil tank during shutdown, saving oil supply time, simplifying operation, ensuring that the hydraulic system can continuously work in a working environment, improving production efficiency, and making the entire hydraulic system more stable and fast.

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

[0044] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0045] The drawings incorporated by reference in the specification illustrate embodiments consistent with the present application and, together with the specification, serve to explain principles of the present application. It is apparent to those skilled in the art that the following description of the drawings is only a few embodiments of the present application, and other drawings can be obtained from these drawings without creative labor.

[0046] Figure 1 A schematic diagram of a connection structure of a power mechanism, a control valve group, an actuating mechanism, a cooling member, an oil tank and an oil supplementing mechanism provided by an embodiment of the present application is shown.

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

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

[0049] Figure 4 A schematic diagram of a connection structure of an oil tank and an oil supplementing mechanism provided by an embodiment of the present application is shown. Figure 3 A schematic diagram of a cross-sectional structure along a cross-sectional line A-A' is shown.

[0050] Figure 5 A schematic diagram of a connection structure of an oil tank and an oil supplementing mechanism provided by an embodiment of the present application is shown.

[0051] Legend of reference signs:

[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, actuating mechanism; 130a, fourth oil inlet; 130b, fourth oil outlet;

[0056] 140, oil tank; 140a, oil supplement inlet; 140b, fifth oil outlet; 140c, fifth oil inlet; 140d, oil drain; 141, gas storage cylinder; 141a, gas charging port; 141b, gas discharging port; 141c, gas chamber; 141d, communication chamber; 1411, cylinder barrel; 14111, first mounting platform; 14112, second mounting platform; 1412, first cylinder cover; 14121, first groove; 1413, second cylinder cover; 14131, second groove; 14132, fifth groove; 142, sliding member; 1421, piston; 1422, sealing member; 143, oil storage cylinder; 1431, oil discharge pipe; 1432, oil storage cavity; 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 member; 144, first pressure sensor; 145, fastener; 146, first connecting member; 147, second connecting member; 148, needle valve;

[0057] 150, oil supplement mechanism; 150a, sixth oil inlet; 150b, sixth oil outlet; 151, oil supplement tank; 152, first oil pumping assembly; 1520, second motor; 1521, second oil pump; 153, first control valve; 154, second control valve; 155, filter; 156, electromagnetic 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 member; 1100a, seventh oil inlet; 1100b, seventh oil outlet. DETAILED DESCRIPTION

[0059] 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 examples set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and will fully convey the scope of example implementations to those skilled in the art.

[0060] In the present application, the terms "first", "second", etc. are used only for descriptive purposes and are not to be construed as indicating or implying relative importance or an indicated number of technical features. Thus, 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.

[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, can be fixedly connected, or can be detachably connected, or integrated; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0062] In addition, the described features, structures or characteristics can be combined in any suitable way in one or more embodiments. In the following description, many specific details are provided to give a thorough understanding of the embodiments of the application. However, those skilled in the art will realize that the technical solutions of the application can be practiced without one or more of the specific details, or other methods, components, devices, steps, etc. can be used. In other cases, well-known methods, devices, implementations or operations are not shown or described in detail to avoid obscuring the aspects of the application.

[0063] Figure 1 The power mechanism, control valve group, actuator, cooling piece, oil tank and oil supplement mechanism connection structure provided by the embodiments of the application are shown.

[0064] The hydraulic system 100 provided by the embodiments of the application can be applied to injection molding machine equipment to realize the injection molding process.

[0065] In some embodiments of the application, referring to Figure 1 The hydraulic system 100 includes a power mechanism 110, a control valve group 120, an actuator 130, an oil tank 140 and an oil supplement mechanism 150.

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

[0067] It should be noted that the first motor 111 can be a servo motor, and of course can also be other types of motors.

[0068] In some embodiments of the 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 communicated with the oil tank 140, and the first oil outlet 114b is communicated with the control valve group 120. By using the first oil pump 114, the hydraulic oil in the oil tank 140 can be pressurized and then extracted into the control valve group 120.

[0069] In some embodiments of the present 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 communicated with the first oil outlet 114b of the first oil pump 114, so that the hydraulic oil after being extracted by the first oil pump 114 flows into the control valve group 120.

[0070] It can be understood that the control valve group 120 can be responsible for adjusting the pressure, flow and other parameters of the oil circuit, and ensuring the stable operation of the system.

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

[0072] In some embodiments of the present 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 communicated with the second oil outlet 120c of the control valve group 120, and the hydraulic oil after completing the 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 the present application, please continue to refer to Figure 1 As shown, the oil tank 140 is communicated with the control valve group 120, the hydraulic oil after working in the actuator 130 flows back to the oil tank 140 through the control valve group 120, and the hydraulic oil in the oil tank 140 is extracted 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 the present application, please continue to refer to Figure 1 As shown, the oil tank 140 is provided with a supplement oil inlet 140a, a fifth oil outlet 140b, a fifth oil inlet 140c and a 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 air and ensure the cleanliness of the hydraulic oil.

[0075] The fifth oil inlet 140c of the oil tank 140 is communicated with the third oil outlet 120d of the control valve group 120, and the fifth oil outlet 140b is communicated with 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 continuously provide power for the actuator 130 to continuously complete injection molding.

[0076] In some embodiments of the present application, please continue to refer to Figure 1 As shown, the oil supplementing mechanism 150 includes a sixth oil inlet 150a and a sixth oil outlet 150b. The sixth oil inlet 150a is communicated with the oil drain 140d in the oil tank 140 for draining the hydraulic oil in the oil tank 140. The sixth oil outlet 150b is communicated with the oil supplementing inlet 140a of the oil tank 140 for supplementing the oil tank 140.

[0077] For example, when the flow of the hydraulic oil in the oil tank 140 is less than the preset pressure range value, the oil supplementing mechanism 150 supplements the hydraulic oil in the oil tank 140 through the sixth oil outlet 150b and the oil supplementing inlet 140a to ensure that the hydraulic system 100 continuously and stably works.

[0078] When the flow of the hydraulic oil in the oil tank 140 is higher or the hydraulic system 100 needs to be stopped for cleaning, the hydraulic oil in the oil tank 140 is recovered to the oil supplementing mechanism 150 through the sixth oil inlet 150a and the oil drain 140d, so as to clean and maintain the hydraulic system 100, thereby ensuring that the hydraulic system 100 stably works.

[0079] The first oil pump 114 in the power mechanism 110 can extract the hydraulic oil in the oil tank 140 into the control valve group 120, and then the control valve group 120 adjusts the pressure and flow of the hydraulic oil entering the actuator 130 to ensure that the system stably works. After the hydraulic oil is used in the actuator 130, it is recovered to the oil tank 140 and then extracted from the oil tank 140 by the first oil pump 114 and enters the control valve group 120 and the actuator 130. In this way, the hydraulic system 100 in the present application realizes continuous injection molding of the injection molding machine.

[0080] The power mechanism 110, the control valve group 120, the actuator 130, the oil tank 140 and the oil supplementing mechanism 150 in the present application make the hydraulic oil flow in a closed environment, the hydraulic oil is not easy to be contaminated, energy consumption is reduced, the stability and service life of the hydraulic system 100 are improved, and the production efficiency of the injection molding machine is improved.

[0081] In addition, the oil supplementing mechanism 150 can also ensure that the hydraulic oil in the oil tank 140 works in a normal pressure environment, avoid the situation of stopping for oil supplementing, and improve the production efficiency.

[0082] Figure 2 A schematic diagram of a three-dimensional structure of an oil tank is shown. Figure 3 A schematic diagram of a structure of the oil tank from a left view is shown. Figure 4 A schematic diagram of a cross-sectional structure of the oil tank is shown. Figure 3 A schematic diagram of a cross-sectional structure of the oil tank is shown.

[0083] In some embodiments of the present application, please refer to Figures 2 to 4 As shown, the oil tank 140 can include a gas storage cylinder 141. The gas storage cylinder 141 can adopt a cylindrical structure, and can store a certain volume of medium inside. Of course, the gas storage cylinder 141 can also adopt other shapes, such as a cuboid or an ellipsoid structure.

[0084] In some embodiments of the present application, please refer to Figure 2 As shown, the gas storage cylinder 141 is provided with a gas filling port 141a, a gas discharge port 141b, and a storage chamber inside the gas storage cylinder 141. The storage chamber can be connected to the outside through the gas filling port 141a and the gas discharge port 141b, so as to fill the storage chamber with gas or release the gas in the storage chamber to the outside, so as to increase or decrease the pressure in the storage chamber.

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

[0086] In some embodiments of the present application, please continue to refer to Figure 4 As shown, the sliding member 142 is slidably arranged in the storage chamber, and the sliding member 142 is sealingly connected to the inner wall of the storage chamber. 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 the present application, please continue to refer to Figure 4As shown, the gas chamber 141c is in communication with the outside through the gas inlet 141a. The gas chamber 141c can be filled with gas through the gas inlet 141a to change the pressure in the gas chamber 141c, so as to push the sliding member 142 to slide in the storage chamber, and change the volume of the gas chamber 141c and the volume of the communication chamber 141d.

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

[0089] In some embodiments of the present application, please continue to refer to Figure 4 As shown, the communication chamber 141d is in communication with the outside through the gas outlet 141b. The gas outlet 141b can discharge the gas in the communication chamber 141d.

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

[0091] In some embodiments of the present 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 cavity 1432. One end of the oil discharge pipe 1431 is connected with 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 cavity 1432. The extension of the oil discharge pipe 1431 into the oil storage cavity 1432 can directly extract the hydraulic oil in the oil storage cavity 1432, which can improve 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 is arranged side by side with the gas cylinder 141, and the oil storage cavity 1432 in the oil storage cylinder 143 is in communication with the communication chamber 141d in the gas cylinder 141, so as to store a certain amount of hydraulic oil in the communication chamber 141d.

[0093] It can be understood that when the sliding member 142 moves away from the gas inlet 141a, the sliding member 142 will extrude the hydraulic oil in the communication chamber 141d, so that the pressure of the hydraulic oil in the communication chamber 141d and the oil storage cavity 1432 gradually increases.

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

[0095] In some embodiments of the present application, referring to Figure 2 As shown, the oil tank 140 further comprises a first pressure sensor 144. The first pressure sensor 144 is arranged outside the oil storage cylinder 143 to detect the pressure value of the hydraulic oil inside the oil storage cavity 1432 and can transmit the measured hydraulic oil pressure value to the controller; that is, the first pressure sensor 144 is electrically connected with the controller.

[0096] In some embodiments of the present application, a first preset pressure range value is arranged in the controller. When the pressure value of the hydraulic oil in the oil storage cavity 1432 measured by the first pressure sensor 144 is less than the first preset pressure range value, the controller controls the volume of the gas entering the gas chamber 141c through the gas inlet 141a, and then controls the sliding member 142 to slide away from the gas inlet 141a. The sliding member 142 extrudes the hydraulic oil in the communication chamber 141d, so that the pressure of the hydraulic oil gradually increases, so as to ensure that the hydraulic oil in the oil storage cavity 1432 keeps within the first preset pressure range value, and ensure the stable operation of the hydraulic system 100.

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

[0098] That is, through the first pressure sensor 144, the controller and the gas charging pump, the hydraulic oil in the oil storage cavity 1432 can be kept within the first preset pressure range value, so that the hydraulic oil always keeps in a positive pressure environment.

[0099] For example, if the pressure value of the hydraulic oil in the oil storage cavity 1432 measured by the first pressure sensor 144 is less than the first preset pressure range value, the controller controls the inflation pump to work, and the inflation pump releases gas into the gas chamber 141c through the inflation port 141a, so that the volume of the gas in the gas chamber 141c gradually increases. Under the action of pressure, the sliding part 142 gradually moves away from the inflation port 141a, so that the volume of the gas chamber 141c gradually increases, the volume of the communication chamber 141d gradually decreases, the sliding part 142 gradually extrudes the hydraulic oil in the communication chamber 141d, and then the pressure of the hydraulic oil in the communication chamber 141d and the oil storage cavity 1432 gradually increases, so that the pressure value in the oil storage cavity 1432 meets the first preset pressure range value.

[0100] By measuring the pressure of the hydraulic oil in the oil storage cavity 1432 in real time through the first pressure sensor 144, the controller can control the volume of the gas released into the gas chamber 141c in the gas cylinder 141 according to the pressure value measured by the first pressure sensor 144 in real time, so as to control the position of the sliding part 142 inside the storage chamber, adjust the volume of the gas chamber 141c and the communication chamber 141d, and then adjust the pressure of the hydraulic oil in the communication chamber 141d. If the hydraulic oil pressure in the oil storage cavity 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, reduce the volume of the communication chamber 141d, and make the sliding part 142 move away from the inflation port 141a. The sliding part 142 extrudes the hydraulic oil in the communication chamber 141d, so that the pressure of the hydraulic oil in the communication chamber 141d and the oil storage cavity 1432 gradually increases, and the pressure of the hydraulic oil in the oil storage cavity 1432 is kept within the first preset pressure range value.

[0101] When the injection molding machine works, the pressure of the hydraulic oil in the oil storage cavity 1432 is greater than the external pressure, so that a positive pressure is formed in the oil storage cavity 1432, which can effectively prevent external air and impurities from entering the oil storage cavity 1432, improve the cleanliness of the hydraulic oil, and reduce the failure rate of the hydraulic system 100, thereby reducing the maintenance time and cost.

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

[0103] In addition, the air storage cylinder 141 and the oil storage cylinder 143 can effectively ensure the closed property 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, the pressure of the hydraulic oil in the oil storage cavity 1432 can be ensured to be a stable oil supply pressure, and sufficient hydraulic power can be obtained by the injection molding machine in different working states.

[0104] In addition, the air storage cylinder 141 and the oil storage cylinder 143 can effectively ensure the closed property 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, the pressure of the hydraulic oil in the oil storage cavity 1432 can be ensured to be a stable oil supply pressure, and sufficient hydraulic power can be obtained by the injection molding machine in different working states.

[0105] In addition, the air storage cylinder 141 and the oil storage cylinder 143 can effectively ensure the closed property 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, the pressure of the hydraulic oil in the oil storage cavity 1432 can be ensured to be a stable oil supply pressure, and sufficient hydraulic power can be obtained by the injection molding machine in different working states.

[0106] It is worth mentioning that the oil storage cylinder 143 can also balance the volume difference between oil suction and oil return of the first oil pump 114, that is, when the oil suction of the first oil pump 114 is less than the oil return, the hydraulic oil enters the oil storage cylinder 143 for storage, and the sliding part 142 moves to the side close to the air inlet 141a; when the oil return is less than the oil suction, the oil storage cylinder 143 releases the previously stored hydraulic oil to make up for the lack of hydraulic oil, so as to ensure the stability and speed of the entire main hydraulic oil circuit.

[0107] In some embodiments of the present application, as shown in FIG. 1, Figure 2 The air storage cylinder 141 and the oil storage cylinder 143 can be arranged in parallel above and below or arranged in parallel left and right, as long as they are in communication with each other.

[0108] For example, as shown in FIG. 1, Figure 2 The air storage cylinder 141 and the oil storage cylinder 143 are arranged in parallel above and below, 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, the hydraulic oil in the communication chamber 141d is extruded by the sliding part 142, and under the action of gravity, the hydraulic oil in the communication chamber 141d is more likely to flow from the upper part to the lower part of the oil storage cavity 1432, so that the pressure of the hydraulic oil in the oil storage cavity 1432 is more likely to be maintained within the first preset pressure range.

[0109] In some embodiments of the present application, as shown in FIG. 1, Figure 2 The air storage cylinder 141 can include a cylinder barrel 1411. The cylinder barrel 1411 is a hollow structure, and the cylinder barrel 1411 can be a cylindrical structure, or other structures such as a cuboid, an ellipsoid, etc.

[0110] It should be noted that the sliding member 142 is arranged inside the cylinder barrel 1411 and sealingly abuts the inner wall of the cylinder barrel 1411.

[0111] In some embodiments of the present application, please continue to refer to Figure 4 As shown, the gas storage cylinder 141 can 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 can also be used, such as triangular, circular, etc.

[0112] In some embodiments of the present application, the first cylinder cover 1412 is arranged on one side of the cylinder barrel 1411 in the axial direction to seal one end of the cylinder barrel 1411. The side wall of the first cylinder cover 1412 is provided with the above-mentioned gas charging port 141a, and the gas charging port 141a penetrates the first cylinder cover 1412 in the axial direction of the cylinder barrel 1411, so that the inside of the cylinder barrel 1411 is in communication with the outside through the gas charging port 141a.

[0113] It should be noted that the side of the sliding member 142 facing the first cylinder cover 1412 forms a gas chamber 141c, and the gas charging pump can be filled into the gas chamber 141c through the gas charging port 141a.

[0114] In some embodiments of the present application, please continue to refer to Figure 4 As shown, the gas storage cylinder 141 can 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 can also be used, such as triangular, circular, etc.

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

[0116] It should be noted that, please continue to refer to Figure 4 As shown, the top wall of the second cylinder cover 1413 is provided with a gas discharge port 141b for discharging gas in the hydraulic oil in the communication chamber 141d or the oil storage chamber 1432, so as to ensure that the hydraulic oil is maintained within a first predetermined pressure range, to ensure the pressure of the hydraulic oil and maintain the normal operation of the system.

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

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

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

[0120] Correspondingly, please continue to refer to Figure 4 As shown, the second cylinder head 1413 is provided with a second recess 14131 with the same shape as the longitudinal section of the cylinder barrel 1411 on the side facing the cylinder barrel 1411. That is, the second cylinder head 1413 is hollowed out on the side facing the cylinder barrel 1411 to form a circular second recess 14131.

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

[0122] Among them, please continue to refer to Figure 4 As shown, the diameter of the second recess 14131 is the same as that of the first recess 14121, and the first cylinder head 1412 and the second cylinder head 1413 effectively limit the cylinder barrel 1411 between 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 surface of the first cylinder head 1412 to the axis of the cylinder barrel 1411 is greater than the distance from the outer wall surface of the cylinder barrel 1411 to the axis of the cylinder barrel 1411. The distance from the top wall surface of the second cylinder head 1413 to the axis of the cylinder barrel 1411 is greater than the distance from the outer wall surface of the cylinder barrel 1411 to the axis of the cylinder barrel 1411. Through the design of the first cylinder head 1412 and the second cylinder head 1413 being higher than the cylinder barrel 1411, direct friction between foreign objects and the cylinder barrel 1411 can be avoided, the integrity of the cylinder barrel 1411 is ensured, and the sealing effect is further ensured.

[0124] In some embodiments of the present application, please continue to refer to Figure 4 As shown in the figure, 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, and the overall stability is ensured.

[0125] In some embodiments of the present application, please continue to refer to Figure 4 As shown in the figure, the oil storage cylinder 143 can include an oil cylinder barrel 1433. The oil cylinder barrel 1433 is a hollow structure, and the oil cylinder barrel 1433 can be a cylindrical structure. Of course, the oil cylinder barrel 1433 can also be other structures, such as a cuboid, an ellipsoid, etc.

[0126] In some embodiments of the present application, please continue to refer to Figure 4 As shown in the figure, the oil storage cylinder 143 can also include a first oil cylinder head 1434. The first oil cylinder head 1434 can adopt the same structure as the first cylinder head 1412, or can adopt other structures. The first oil cylinder head 1434 can be arranged at the bottom of the first cylinder head 1412 and abut against the first cylinder head 1412.

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

[0128] In some embodiments of the present application, please continue to refer to Figure 4 As shown in the figure, the first oil cylinder head 1434 is arranged at one side of the oil cylinder barrel 1433 in the axial direction to seal one end of the oil cylinder barrel 1433. The side wall of the first oil cylinder head 1434 is provided with the oil discharge pipe 1431 described above, which is in communication with the inside of the oil cylinder barrel 1433, so as to extract hydraulic oil inside the oil cylinder barrel 1433.

[0129] In some embodiments of the present application, please continue to refer to Figure 2As shown, the oil storage cylinder 143 can further include a second oil cylinder cover 1435. The second oil cylinder cover 1435 can adopt the same structure as the second cylinder cover 1413, or other structures. The second oil cylinder cover 1435 can be arranged at the bottom of the second cylinder cover 1413 and abut against the second cylinder cover 1413.

[0130] In some embodiments of the present 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 adopted, such as triangular, circular, etc. The second oil cylinder cover 1435 is arranged at the other axial side of the oil cylinder barrel 1433 and is arranged opposite and parallel to the first oil cylinder cover 1434, and the second oil cylinder cover 1435 seals the other side of the oil cylinder barrel 1433.

[0131] It should be noted that, please refer to Figure 4 and Figure 4 As shown, the side wall surface of the second oil cylinder cover 1435 is provided with a first pressure sensor 144, which is used to detect the pressure value of the hydraulic oil inside the oil cylinder barrel 1433, and can transmit signals to the controller in real time, so as to ensure that the hydraulic oil inside the oil cylinder barrel 1433 is kept within the first preset pressure range value.

[0132] The oil storage cylinder 143 in the present application adopts a segmented structure, which can be more easily installed and disassembled during installation and maintenance, and the segmented splicing structure can also simplify the processing difficulty and improve the equipment precision of the oil storage cylinder 143.

[0133] It is worth mentioning that, please continue to refer to Figure 4 As shown, the first oil cylinder cover 1434 is provided with a third recess 14341 with the same shape as the longitudinal section of the oil cylinder barrel 1433 on the side facing the oil cylinder barrel 1433. That is, the first oil cylinder cover 1434 is hollowed out to have a circular third recess 14341 on the side facing the oil cylinder barrel 1433.

[0134] In some embodiments of the present application, please continue to refer to Figure 4 As shown, the outer wall of the oil cylinder barrel 1433 on the side facing the first oil cylinder cover 1434 is provided with an annular third mounting table 14331, and the distance from the outer wall surface of the third mounting table 14331 to the axis of the oil cylinder barrel 1433 is less 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 third recess 14341 of the first oil cylinder cover 1434. When the oil cylinder barrel 1433 is inserted into the third recess 14341 at one end, the outer wall surface of the third mounting table 14331 of the oil cylinder barrel 1433 abuts against the inner wall surface of the third recess 14341.

[0135] Correspondingly, please continue to refer to Figure 4As shown, the second oil cylinder cover 1435 is provided with a fourth groove 14351 with the same shape as the longitudinal section of the oil cylinder barrel 1433 on the side facing the oil cylinder barrel 1433. That is, the second oil cylinder cover 1435 is hollowed out on the side facing the oil cylinder barrel 1433 to form a circular fourth groove 14351.

[0136] In some embodiments of the present application, please continue to refer to Figure 4 As shown, the outer wall of the oil cylinder barrel 1433 on the side facing the second oil cylinder cover 1435 is provided with an annular fourth mounting platform 14332. The distance from the outer wall surface of the fourth mounting platform 14332 to the axis of the oil cylinder barrel 1433 is less than the distance from the outer wall surface of the oil cylinder barrel 1433 to the axis of the oil cylinder barrel 1433, so 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] The diameter of the fourth groove 14351 is the same as that of the third groove 14341, and the oil cylinder barrel 1433 is effectively limited between the first oil cylinder cover 1434 and the second oil cylinder cover 1435 by the first oil cylinder cover 1434 and the second oil cylinder cover 1435, thereby enhancing the sealing effect of the oil cylinder barrel 1433.

[0138] In addition, the distance from the top wall surface 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 surface of the oil cylinder barrel 1433 to the axis of the oil cylinder barrel 1433. The distance from the top wall surface 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 surface of the oil cylinder barrel 1433 to the axis of the oil cylinder barrel 1433. By designing the first oil cylinder cover 1434 and the second oil cylinder cover 1435 to be higher than the oil cylinder barrel 1433, direct friction between foreign objects and the oil cylinder barrel 1433 can be avoided, the integrity of the oil cylinder barrel 1433 is ensured, and the sealing effect is further ensured.

[0139] The axial ends of the oil cylinder barrel 1433 are sealed by the first oil cylinder cover 1434 and the second oil cylinder cover 1435, so that the first oil cylinder cover 1434, the second oil cylinder cover 1435 and the oil cylinder barrel 1433 can serve as an oil storage chamber 1432 for storing hydraulic oil. This can avoid contact between the hydraulic oil and external 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 they are arranged in an up-down side-by-side manner.

[0141] It is worth mentioning that, please continue to refer toFigure 2 As shown, the air storage cylinder 141 and the oil storage cylinder 143 can be fixed by the fastener 145 such as a bolt.

[0142] For example, the fastener 145 such as a bolt is used to fix the connection of the air storage cylinder 141 and the oil storage cylinder 143.

[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) which communicates with the communication chamber 141d.

[0144] In some embodiments of the present application, the top wall of the second oil cylinder head 1435 is provided with a second opening (not shown in the figure) which communicates with the oil storage cavity 1432, and the second opening corresponds to the first opening. The oil storage cavity 1432 communicates with the communication chamber 141d through the second opening and the first opening, so that when the sliding member 142 extrudes the hydraulic oil in the communication chamber 141d, it can generate extrusion force on the hydraulic oil in the oil storage cavity 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 speed of the hydraulic oil, and improve the response speed and accuracy of the system.

[0145] In some embodiments of the present application, please continue to refer to Figure 2 As shown, the second cylinder head 1413 is also provided with a fifth groove 14132. The fifth groove 14132 is located on the side of the second groove 14131 away from the sliding member 142, and the diameter of the fifth groove 14132 is smaller than that of the second groove 14131. The fifth groove 14132 communicates 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, so as to ensure that the sliding member 142 can slide into the inside of the second cylinder head 1413, so as to further extrude the hydraulic oil, so as to ensure that the hydraulic oil can be within the first preset pressure range.

[0147] In some embodiments of the present application, please continue to refer to Figure 2 As shown, the oil tank 140 can also include a first connecting piece 146. One end of the first connecting piece 146 is connected with the first cylinder head 1412, and the other end is connected with the second cylinder head 1413, and the first connecting piece 146 is located outside the cylinder barrel 1411.

[0148] That is, please continue to refer to Figure 2As shown, the first connecting piece 146 is arranged to extend in the axial direction of the cylinder barrel 1411, and the first connecting piece 146 is used to fix the first cylinder cover 1412, the cylinder barrel 1411 and the second cylinder cover 1413 together, so as to ensure the connection tightness between the first cylinder cover 1412, the cylinder barrel 1411 and the second cylinder cover 1413, improve the sealing effect of the storage chamber, and avoid the gas leakage or oil leakage.

[0149] It should be noted that, please continue to refer to Figure 2 As shown, the first connecting piece 146 and the first cylinder cover 1412 and the second cylinder cover 1413 can be connected by threads, or can be connected by other ways, such as buckling, welding and the like.

[0150] In some embodiments of the present application, please continue to refer to Figure 2 As shown, one end of the first connecting piece 146 penetrates the first cylinder cover 1412, and the part of the first connecting piece 146 penetrating the first cylinder cover 1412 is screwed by a nut to connect the first connecting piece 146 and the first cylinder cover 1412 together.

[0151] Correspondingly, please continue to refer to Figure 2 As shown, the other end of the first connecting piece 146 also penetrates the second cylinder cover 1413, and the part of the first connecting piece 146 penetrating the second cylinder cover 1413 is screwed by a nut to connect the first connecting piece 146 and the second cylinder cover 1413 together.

[0152] That is, the first cylinder cover 1412, the cylinder barrel 1411 and the second cylinder cover 1413 are fixed together by the nut and the first connecting piece 146, so as to improve the overall stability of the gas storage cylinder 141.

[0153] In some embodiments of the present application, please continue to refer to Figure 2 As shown, the oil tank 140 can also include a second connecting piece 147. One end of the second connecting piece 147 is connected with the first oil cylinder cover 1434, and the other end is connected with the second oil cylinder cover 1435, and the second connecting piece 147 is arranged outside the oil cylinder barrel 1433.

[0154] That is, the second connecting piece 147 is arranged to extend in the axial direction of the oil cylinder barrel 1433, and the second connecting piece 147 is used to fix the first oil cylinder cover 1434, the oil cylinder barrel 1433 and the second oil cylinder cover 1435 together, so as to ensure the connection tightness between the first oil cylinder cover 1434, the oil cylinder barrel 1433 and the second oil cylinder cover 1435, improve the sealing effect of the oil storage chamber 1432, and avoid the oil leakage.

[0155] It should be noted that the second connecting piece 147 can be connected with the first oil cylinder cover 1434 and the second oil cylinder cover 1435 through threads, or can be connected through other ways, such as buckling, welding and the like.

[0156] In some embodiments of the present application, please continue to refer to Figure 2 As shown in the figure, one end of the second connecting piece 147 penetrates the first oil cylinder cover 1434, and the part of the second connecting piece 147 penetrating the first oil cylinder cover 1434 is screwed with a nut to connect the second connecting piece 147 with the first oil cylinder cover 1434 together.

[0157] Correspondingly, please continue to refer to Figure 2 As shown in the figure, the other end of the second connecting piece 147 also penetrates the second oil cylinder cover 1435, and the part of the second connecting piece 147 penetrating the second oil cylinder cover 1435 is screwed with a nut to connect the second connecting piece 147 with the second oil 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 together through the nut and the second connecting piece 147, so as to improve the overall stability of the oil storage cylinder 143.

[0159] In some embodiments of the present application, please continue to refer to Figure 2 As shown in the figure, the gas storage cylinder 141 is provided with a plurality of first connecting pieces 146. The plurality of first connecting pieces 146 are arranged around the cylinder barrel 1411, and the stability of the gas storage cylinder 141 can be improved through the plurality of first connecting pieces 146, so as to avoid the shaking of the gas storage cylinder 141 and ensure the sealing effect of the gas storage cylinder 141.

[0160] For example, please continue to refer to Figure 2 As shown in the figure, the gas storage cylinder 141 is provided with four first connecting pieces 146, and the four first connecting pieces 146 are respectively arranged at four corners of the first cylinder cover 1412 and the second cylinder cover 1413, so as to ensure the stability of the gas storage cylinder 141.

[0161] In some embodiments of the present application, please continue to refer to Figure 4 As shown in the figure, the oil storage cylinder 143 is provided with a plurality of second connecting pieces 147. The plurality of second connecting pieces 147 are arranged around the oil cylinder barrel 1433, and the stability of the oil storage cylinder 143 can be improved through the plurality of second connecting pieces 147, so as to avoid the shaking of the oil storage cylinder 143 and ensure the sealing effect of the oil storage cylinder 143.

[0162] For example, please continue to refer to Figure 4 As shown in the figure, the oil storage cylinder 143 is provided with four second connecting pieces 147, and the four second connecting pieces 147 are respectively arranged at four corners of the first oil cylinder cover 1434 and the second oil cylinder cover 1435, so as 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, for example, a cylindrical rod structure.

[0164] In some embodiments of the present application, please continue to refer to Figure 2 As shown, the sliding member 142 can 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 sealingly connected with the inner wall of the cylinder barrel 1411 through the sealing member 1422, so as to avoid the mutual flow of the gas in the gas chamber 141c and the hydraulic oil in the communication chamber 141d, and ensure the sealing of the gas chamber 141c and the communication chamber 141d.

[0165] It should be noted that the piston 1421 can be inflated into the gas chamber 141c inside the cylinder barrel 1411 through the inflation port 141a after being put into the cylinder barrel 1411, so that the piston 1421 can move to the second cylinder cover 1413. During the work process, 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 the communication chamber 141d is formed between the piston 1421 and the second cylinder cover 1413, and the dynamic balance is maintained between the gas chamber 141c and the communication 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, so as to ensure that the hydraulic oil in the oil storage chamber 1432 is maintained in a positive pressure environment.

[0166] In some embodiments of the present application, please continue to refer to Figure 5 As shown, the oil storage cylinder 143 further includes a filter 1436 arranged inside the oil storage chamber 1432. The filter 1436 is arranged 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 by the filter 1436 first, and then discharged into the first oil pump 114 through the oil discharge pipe 1431, and finally enters the hydraulic system 100 for work, so as to ensure the cleanliness of the hydraulic oil entering the hydraulic system 100, reduce the failure rate of the hydraulic system 100, and thus reduce the maintenance time and cost.

[0167] In some embodiments of the present application, please continue to refer to Figure 5 As shown, the top wall of the second cylinder cover 1413 is further provided with a needle valve 148. The needle valve 148 can cooperate with the oil port on the second cylinder cover 1413 to supply oil or discharge oil into the communication chamber 141d and the oil storage chamber 1432.

[0168] Figure 5A connection structure diagram of the oil supplement mechanism and the oil tank 0 is shown.

[0169] In some embodiments of the present application, the pipeline connected between 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 connected between 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 the present application, please refer to Figure 5 As shown, the hydraulic system 100 further comprises a first pressure detection device 160. The first pressure detection device 160 is arranged on the oil inlet pipeline. The first pressure detection device 160 is connected with the controller, which can be used to detect the pressure value on the oil inlet pipeline.

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

[0172] The controller can open or close the first overflow valve 170 according to the pressure value detected by the first pressure detection device 160, so as to release the hydraulic oil on 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 overflow valve 170 to open, so that 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 overflow 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 overflow valve 190 can prevent the hydraulic oil on the pipeline connected thereto from being over-pressured, and plays a role of constant pressure overflow, thereby playing a safety protection role for pressure stabilization and unloading of the hydraulic system 100.

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

[0176] In some embodiments of the present application, please continue to refer to Figure 5As shown, the oil supplement tank 151 is used to store hydraulic oil. The oil suction port of the first pump oil assembly 152 is communicated with the oil supplement tank 151, and the first pump oil assembly 152 includes a second motor 1520 and a second oil pump 1521, the second motor 1520 is connected with the second oil pump 1521, and the second motor 1520 can drive the second oil pump 1521 to pump the hydraulic oil in the oil supplement tank 151 into the oil tank 140.

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

[0178] In addition, please continue to refer to Figure 5 As shown, the connection pipeline between the oil outlet of the second oil pump 1521 and the oil supplement inlet 140a of the oil tank 140 is an oil supplement pipeline, and a first control valve 153 is arranged on the oil supplement pipeline. When the second oil pump 1521 extracts the hydraulic oil in the oil supplement tank 151, the first control valve 153 is opened to supplement the oil tank 140.

[0179] It is worth mentioning that, please continue to refer to Figure 5 As shown, a second pressure detection device 180 is also arranged on the oil supplement pipeline. The second pressure detection device 180 is used to detect the pressure of the hydraulic oil in the oil supplement 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 supplement pipeline, and the second pressure sensor 182 is used to detect the pressure of the hydraulic oil in the oil supplement pipeline and convert the detected pressure signal into an electrical signal transmitted to the controller.

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

[0181] Among them, the controller can judge whether to open the second overflow 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 oil supplement tank 151, so as to reduce the pressure of the hydraulic oil at the oil outlet of the second oil pump 1521, so as to protect the compensation oil circuit.

[0183] It should be noted that the second overflow valve 190 can prevent the hydraulic oil in the connection pipeline from overpressure, and has the function of constant pressure overflow, which plays a safety protection role for pressure stabilization and unloading of the hydraulic system 100.

[0184] In some embodiments of the present application, please continue to refer toFigure 5 As shown, the oil supplement mechanism 150 further comprises a filter 155, which is arranged on the connecting pipeline between the first oil pump assembly 152 and the oil supplement tank 151, i.e. the filter 155 is arranged on the connecting pipeline between the oil suction port of the second oil pump 1521 and the oil supplement tank 151. The filter 155 can remove impurities in the hydraulic oil, ensure the purity of the hydraulic oil, and further ensure the working stability of the hydraulic system 100.

[0185] In some embodiments of the present application, please continue to refer to Figure 5 As shown, the oil supplement mechanism 150 further comprises a solenoid valve 156. The first end of the first control valve 153 is in communication with the oil supplement inlet 140a of the oil tank 140, the second end of the first control valve 153 is connected with the first end of the solenoid valve 156, and the second end of the solenoid valve 156 is in communication with the oil outlet of the second oil pump assembly. That is, the solenoid valve 156 is arranged between the first control valve 153 and the second oil pump assembly. The solenoid valve 156 is electrically connected with the controller, i.e. 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 oil supplement from the oil supplement tank 151 to the oil tank 140 or to shut off the connecting pipeline between the oil supplement tank 151 and the oil tank 140.

[0186] In some embodiments of the present application, please continue to refer to Figure 1 As shown, the oil supplement mechanism 150 further comprises a third overflow valve 157. The first end of the second control valve 154 is in communication with the oil drain port 140d of the oil tank 140, the second end of the second control valve 154 is in communication with the first end of the third overflow valve 157, and the second end of the third overflow valve 157 is in communication with the oil supplement tank 151. Through the second control valve 154 and the third overflow valve 157, the hydraulic oil in the oil tank 140 can be drained into the oil supplement tank 151.

[0187] In some embodiments of the present application, please continue to refer to ​ As shown, the first control valve 153 and the second control valve 154 are one-way valves. Among them, the first control valve 153 allows the hydraulic oil to flow from the oil supplement tank 151 to the oil tank 140, while limiting the hydraulic oil in the oil tank 140 from flowing back to the oil supplement 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 150a of the oil supplement tank 151, while limiting the hydraulic oil in the oil supplement 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 of hydraulic oil with air, improving the cleanliness of the hydraulic oil, and further avoiding stoppage oil supply, so that the injection molding machine can continue to produce.

[0188] In some embodiments of the present application, please continue to refer to ​As shown, the hydraulic system 100 further comprises a cooling member 1100. The cooling member 1100 can adopt a cooler, and the cooling member 1100 is provided with a seventh oil inlet 1100a and a seventh oil outlet 1100b. 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 subjected to cooling treatment by the cooling member 1100, so as to prevent the temperature from being too high to cause the quality of the hydraulic oil to be poor.

[0189] The application scheme has at least the following technical effects:

[0190] The power mechanism 110, the control valve group 120, the actuator 130, the oil tank 140 and the oil supplement mechanism 150 make the hydraulic oil work in a closed environment, prevent the hydraulic oil from being polluted, reduce energy loss, and thus reduce the energy consumption of the injection molding machine, improve the stability and service life of the hydraulic system 100. The oil supplement mechanism 150 can also effectively automatically supply oil to the oil tank 140 in a closed manner, avoid supplying oil to the oil tank 140 during shutdown, save oil supply time, simplify operation, ensure that the hydraulic system 100 can continuously work in a working environment, improve production efficiency, and make the entire hydraulic system 100 more stable and fast.

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

[0192] The positive pressure environment in the oil storage cavity 1432 can also reduce the contact between the hydraulic oil and oxygen in the air, thereby reducing the oxidation speed of the hydraulic oil and ensuring the performance stability of the hydraulic oil.

[0193] The positive pressure environment in the oil storage cavity 1432 can also maintain stable oil supply pressure, so that the injection molding machine can obtain sufficient hydraulic power in different working states. Providing stable oil supply pressure can ensure the consistency and reliability of the injection molding stage and reduce the occurrence of product defects.

[0194] The positive pressure environment in the oil storage cavity 1432 can also keep the pressure at the oil suction port of the oil pump positive, avoid cavitation phenomenon, 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] This oil tank 140 can also provide stable hydraulic power for high-speed injection molding machines, ensuring that they can quickly and accurately complete various actions, improving production efficiency and product quality.

[0197] 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 included in at least one embodiment or example of the present application. In the present specification, the illustrative 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. Furthermore, 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.

[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 limiting the present application, and the person skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application. However, any changes or modifications made in accordance with the claims and specification of the present application shall be within the scope of the present application.

Claims

1. A hydraulic system characterized by, 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; an actuator, provided with a fourth oil inlet and a fourth oil outlet, wherein the fourth oil inlet is connected to the second oil outlet, and the fourth oil outlet is connected to the third oil inlet; a fuel tank having an oil replenishment inlet, a fifth oil inlet, a fifth oil outlet, and an oil drain port, wherein the fifth oil inlet is connected to the third oil outlet, and the fifth oil outlet is connected to the first oil inlet; an oil replenishing mechanism, provided with a sixth oil inlet and a sixth oil outlet, wherein 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 into the actuator through the control valve group to enable the actuator to complete injection molding. The hydraulic oil passing through the actuator flows back to the oil tank, and the oil replenishing mechanism can replenish the hydraulic oil into the oil tank.

2. The hydraulic system of claim 1, wherein, The hydraulic system further includes a controller; the oil tank includes: An air storage cylinder, wherein the air storage cylinder is provided with an air charging port, an air exhaust port, and a storage chamber provided inside the air storage cylinder, wherein 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 an inner wall of the storage chamber, the sliding member dividing the storage chamber into a gas chamber and a communication chamber, the gas chamber communicating with the outside world through the inflation port, and the communication chamber communicating with the outside world through the exhaust port; an oil storage cylinder, arranged side by side with the air storage cylinder, the oil storage cylinder being provided with an oil discharge pipe and an oil storage chamber for storing hydraulic oil, the oil storage chamber being communicated with the first oil inlet of the power mechanism through the oil discharge pipe, the oil storage chamber being provided with the oil replenishment inlet, and the oil storage chamber being communicated with the communication chamber; a first pressure sensor, disposed outside the oil storage cylinder, capable of detecting the pressure value of the hydraulic oil inside the oil storage chamber; In which, 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 to control the position of the sliding member inside the storage chamber to adjust the volume of the gas chamber and the connecting chamber.

3. The hydraulic system of claim 2, wherein, The gas storage cylinder and the oil storage cylinder are arranged side by side up and down.

4. The hydraulic system of claim 3, wherein, The gas storage cylinder comprises: A first cylinder head is provided with the charging port; a second cylinder head, opposite to and spaced apart from the first cylinder head, the second cylinder head being provided with the exhaust port; a cylinder barrel having a hollow structure, wherein opposite ends of the cylinder barrel are respectively connected to the first cylinder head and the second cylinder head, and form the storage chamber together with the first cylinder head and the second cylinder head; The sliding member is arranged in the cylinder barrel and is in sealing connection with the inner wall of the cylinder barrel, and the sliding member and one side of the second cylinder cover form the communication chamber, and the sliding member and one side of the first cylinder cover form the gas chamber.

5. The hydraulic system of claim 4, wherein, The oil storage cylinder comprises: The first oil cylinder cover is arranged below the first cylinder cover and abuts against the first cylinder cover, and the first oil cylinder cover is provided with the oil discharge pipe; The second oil cylinder cover is arranged below the second cylinder cover and abuts against the second cylinder cover, and the first pressure sensor is arranged on the second oil cylinder cover and communicates with the oil storage chamber; The oil cylinder barrel is a hollow structure, and opposite ends of the oil cylinder barrel are connected with the first oil cylinder cover and the second oil cylinder cover respectively and form the oil storage chamber with the first oil cylinder cover and the second oil cylinder cover.

6. The hydraulic system of claim 5, wherein, The oil tank further comprises: The first connecting piece is connected at one end with the first cylinder cover and at the other end with the second cylinder cover; The second connecting piece is connected at one end with the first oil cylinder cover and at the other end with the second oil cylinder cover.

7. The hydraulic system of claim 2, wherein, The oil storage cylinder further comprises a filter arranged in the oil storage chamber, and the filter is connected with the side of the oil discharge pipe away from the power mechanism.

8. The hydraulic system of claim 2, wherein, The oil supplementing mechanism comprises: An oil supplementing tank; A first oil pumping assembly, the oil suction port of the first oil pumping assembly communicates with the oil supplementing tank, and the oil discharge port of the first oil pumping assembly communicates with the oil supplementing inlet; A first control valve, the first control valve is arranged on the connecting pipeline between the oil discharge port of the first oil pumping assembly and the oil supplementing inlet; A second control valve, the second control valve is arranged on the connecting pipeline between the oil discharge port and the sixth oil inlet; The controller can control the first oil pumping assembly to be in a working state or a shutdown state based on the pressure value detected by the first pressure sensor.

9. The hydraulic system of claim 8, wherein, The first control valve and the second control valve are one-way valves; The first control valve allows hydraulic oil to flow from the oil discharge port of the first oil pumping assembly to the oil supplementing inlet of the oil tank, and the second control valve allows the hydraulic oil to flow from the oil discharge port to the sixth oil inlet of the oil supplementing tank.

10. The hydraulic system of claim 1, wherein, The hydraulic system further comprises a cooling member, the cooling member is provided with a seventh oil inlet and a seventh oil outlet, the seventh oil inlet communicates with the third oil discharge port of the control valve group, and the seventh oil outlet communicates with the fifth oil inlet of the oil tank.

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