Hydraulic driving system of laminating machine and laminating machine

Abstract

The utility model relates to a hydraulic driving system of a laminating machine and the laminating machine. The hydraulic driving system of the laminating machine comprises a driving mechanism, an oil tank, a hydraulic cylinder, a pressure maintaining electromagnetic valve pressure sensor, a high-pressure oil way, an energy storage oil way, a pressure reduction oil way and a low-pressure oil way. According to the hydraulic driving system of the laminating machine, the pressure maintaining electromagnetic valve used for stabilizing the pressure maintaining process is arranged on the main oil way of the outlet of the hydraulic cylinder, the pressure sensor is arranged between the hydraulic cylinder and the pressure maintaining electromagnetic valve so as to monitor the pressure of the hydraulic cylinder, and the stability of the system is improved. Meanwhile, the number of times of pressure supplementation of the energy accumulator, the number of times of pressure supplementation of the second electromagnetic directional valve, the number of times of pressure relief of the first electromagnetic directional valve and the number of times of starting of the electric proportional speed regulating valve are reduced, then the starting frequency of the motor in the pressure maintaining state is reduced, the service life of equipment is prolonged, and energy consumption is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of laminating machines, in particular to a hydraulic driving system of a laminating machine and the laminating machine. BACKGROUND

[0002] In the fields of computers, communication equipment, consumer electronics, industrial control, etc., multi-layer PCBs are needed. A hot press is an indispensable key equipment for manufacturing multi-layer PCBs, and the hot press is needed for laminating and forming the multi-layer PCBs. The laminating machine processing technology often requires that the hydraulic driving system has the ability to flexibly control the pressure and maintain it for a long time.

[0003] One kind of laminating machine controls the hydraulic cylinder pressure by controlling the speed and volume of the hydraulic cylinder oil in and out through the electromagnetic reversing valve combined with the mechanical speed regulating valve. However, the pressure rise rate depends on the size of the speed regulating valve, and after the opening degree of the speed regulating valve is set, the pressure rise rate is also fixed, which cannot adapt to the changing process requirements. Another kind of laminating machine is to connect a plurality of first one-way valves and an electric proportional speed regulating valve to each other to form a bridge type flow control unit, and only one electric proportional speed regulating valve combined with a controller can control the oil flow.

[0004] However, the complexity of the working state of the laminating machine in the prior art, there are multiple circuits between the hydraulic cylinder and the oil tank, and because of the inherent characteristics of the valve, the high-pressure hydraulic cylinder will leak hydraulic oil to the oil tank, which will cause the pressure in the hydraulic cylinder to drop, and the pressure maintaining and pressure relief valves and the electric proportional speed regulating valve need to be frequently started to maintain the stability of the system pressure, which will result in low system pressure stability and inevitably affect the service life and accuracy of the valve, and the electric motor needs to be frequently started to supplement the system pressure, which increases the energy consumption. Practical new type content

[0005] Therefore, it is necessary to provide a hydraulic driving system of a laminating machine and the laminating machine to solve the problems of the laminating machine in the prior art, which needs to frequently start the pressure maintaining and pressure relief valves and the electric proportional speed regulating valve to maintain the stability of the system pressure, which results in low system pressure stability and inevitably affects the service life and accuracy of the valve and increases the energy consumption.

[0006] A hydraulic driving system of a laminating machine, the hydraulic driving system of the laminating machine comprises:

[0007] An oil tank for storing oil;

[0008] A hydraulic cylinder for providing a driving force for pressing the laminated plates;

[0009] A low-pressure oil circuit connected with the hydraulic cylinder;

[0010] A high-pressure oil circuit connected with the hydraulic cylinder;

[0011] A driving mechanism is connected with the oil tank, the low-pressure oil circuit and the high-pressure oil circuit respectively, and is used to supply the oil in the oil tank to the low-pressure oil circuit and the high-pressure oil circuit;

[0012] A pressure maintaining solenoid valve is arranged at the inlet of the hydraulic cylinder;

[0013] A pressure sensor is arranged between the hydraulic cylinder and the pressure maintaining solenoid valve;

[0014] The high-pressure oil circuit comprises a first oil pipe, a plurality of first one-way valves and an electric proportional speed regulating valve, two ends of the first oil pipe are connected with the hydraulic cylinder and the driving mechanism respectively, the plurality of first one-way valves and the electric proportional speed regulating valve form a bridge type flow control unit, the bridge type flow control unit is arranged at the first oil pipe, and the bridge type flow control unit is used to control the flow rate of the oil flowing through the first oil pipe.

[0015] The hydraulic driving system has the states of rapid pressing, slow pressing, pressurizing, pressure maintaining and pressure compensating, pressure maintaining and pressure releasing, pressure releasing and rapid pressure reducing in actual use. First, the to-be-laminated board is placed at the pressing position, and then the opening signal of the electric proportional speed regulating valve (the bridge type flow control unit controls the flow rate of the oil flowing through the first oil pipe) is controlled to control the oil flow rate of the high-pressure oil circuit to the hydraulic cylinder, so as to switch between the above states. The hydraulic cylinder generates pressure on the to-be-laminated board mainly through rapid pressing and slow pressing. The pressure maintaining solenoid valve is always opened to realize rapid pressing, slow pressing and pressurizing of the hydraulic cylinder to adapt to the requirement of pressure change in the process flow. The pressure is increased to the set pressure. In the pressure maintaining process, the pressure on the to-be-laminated board is constant. If the pressure sensor detects that the pressure on the to-be-laminated board increases or decreases, the pressure compensating or pressure releasing in the pressure maintaining state is realized by comparing the signal of the pressure sensor with the set value and controlling the signal of the electric proportional speed regulating valve. In this process, the pressure maintaining solenoid valve is always opened to ensure stable pressure compensating or pressure releasing in the pressure maintaining state. After the pressing is completed, pressure releasing and rapid pressure reducing are needed. In this process, the oil in the hydraulic cylinder mainly flows back to the oil tank, so that the hydraulic cylinder is retracted to the initial position, and finally the pressing process is completed. The to-be-laminated board after the pressing is completed can be taken out. In the hydraulic driving system of the laminating machine, the pressure maintaining solenoid valve for stabilizing the pressure maintaining process is arranged on the main oil circuit at the outlet of the hydraulic cylinder, and the pressure sensor is arranged between the hydraulic cylinder and the pressure maintaining solenoid valve to monitor the pressure of the hydraulic cylinder. The pressure maintaining solenoid valve is closed in the pressure maintaining process. The leakage of the electromagnetic valves in all branch oil circuits leading to the oil tank is concentrated on the pressure maintaining solenoid valve. The oil leakage first passes through the pressure maintaining solenoid valve on the main oil circuit at the outlet of the hydraulic cylinder, greatly reducing the oil leakage amount of the oil only passing through the plurality of first one-way valves and other electromagnetic valves, and reducing the oil pressure on each branch, further reducing the oil leakage amount in the pressure maintaining state under high pressure, and increasing the stability of the system.

[0016] In an embodiment, four first one-way valves are provided, and the electric proportional speed regulating valve has a first port and a second port;

[0017] The output ends of two of the first one-way valves are connected to the first oil pipe, and the input ends of the two first one-way valves are connected to form a first connection part;

[0018] The input ends of the other two first one-way valves are connected to the first oil pipe, and the output ends of the two first one-way valves are connected to form a second connection part;

[0019] The first port of the electric proportional speed regulating valve is connected to the first connection part, and the second port of the electric proportional speed regulating valve is connected to the second connection part, thereby forming the bridge type flow control unit.

[0020] In an embodiment, the hydraulic drive system of the laminating machine further comprises a first electromagnetic reversing valve, a second electromagnetic reversing valve, a second one-way valve, and a filter. The first electromagnetic reversing valve is arranged on the first oil pipe between the hydraulic cylinder and the bridge type flow control unit. The second electromagnetic reversing valve is arranged on the first oil pipe between the bridge type flow control unit and the drive mechanism. The second one-way valve is arranged on the first oil pipe between the second electromagnetic reversing valve and the drive mechanism. The filter is arranged on the first oil pipe between the second one-way valve and the drive mechanism.

[0021] In an embodiment, the hydraulic drive system of the laminating machine further comprises a second oil pipe and a third electromagnetic reversing valve. One end of the second oil pipe is connected to the first oil pipe at the input end of the second one-way valve. The other end of the second oil pipe is connected to the oil tank. The third electromagnetic reversing valve is arranged on the second oil pipe.

[0022] In an embodiment, the hydraulic drive system of the laminating machine further comprises an energy storage oil path. The energy storage oil path is connected to the first oil pipe between the second electromagnetic reversing valve and the second one-way valve.

[0023] In an embodiment, the hydraulic drive system of the laminating machine further comprises an energy storage oil path. The energy storage oil path is connected to the first oil pipe between the second electromagnetic reversing valve and the second one-way valve.

[0024] In an embodiment, the hydraulic driving system of the laminating machine further comprises a pressure reducing oil path, the pressure reducing oil path is connected with the hydraulic cylinder and the oil tank respectively, and the second electromagnetic reversing valve is connected with the pressure reducing oil path.

[0025] In an embodiment, the hydraulic driving system of the laminating machine, the pressure reducing oil path comprises a fourth oil pipe and a large-flow on-off throttle valve, one end of the fourth oil pipe is connected with the hydraulic cylinder, the other end of the fourth oil pipe is connected with the oil tank, the large-flow on-off throttle valve is arranged in the fourth oil pipe, and the second electromagnetic reversing valve is connected with the fourth oil pipe at the output end of the large-flow on-off throttle valve.

[0026] In an embodiment, the hydraulic driving system of the laminating machine, the large-flow on-off throttle valve comprises a first two-way cartridge valve, a cover plate and a fourth electromagnetic reversing valve, the first two-way cartridge valve, the fourth electromagnetic reversing valve and the cover plate are arranged in cooperation for controlling the flow of the oil flowing through the fourth oil pipe.

[0027] In an embodiment, the low-pressure oil path comprises a fifth oil pipe, a sixth oil pipe, a third one-way valve and a large-flow electromagnetic overflow valve, two ends of the fifth oil pipe are connected with the driving mechanism and the hydraulic cylinder respectively, two ends of the sixth oil pipe are connected with the driving mechanism and the oil tank respectively, the third one-way valve is arranged in the fifth oil pipe, and the large-flow electromagnetic overflow valve is arranged in the sixth oil pipe.

[0028] In an embodiment, the large-flow electromagnetic overflow valve comprises a second two-way cartridge valve, a first overflow valve and a fifth electromagnetic reversing valve, the second two-way cartridge valve, the first overflow valve and the fifth electromagnetic reversing valve are arranged in cooperation for controlling the flow of the oil flowing through the sixth oil pipe.

[0029] In an embodiment, the hydraulic driving system of the laminating machine comprises a motor, a high-pressure pump and a low-pressure pump, the high-pressure pump is connected with the oil tank and the high-pressure oil path respectively for providing the oil for the high-pressure oil path, the low-pressure pump is connected with the oil tank and the low-pressure oil path respectively for providing the oil for the low-pressure oil path, and the motor is connected with the high-pressure pump and the low-pressure pump respectively.

[0030] An embodiment of the present application further provides a laminating machine comprising a hot plate and the hydraulic driving system.

[0031] The laminating machine of the application is provided with a pressure maintaining electromagnetic valve for stabilizing the pressure maintaining process on the main oil path of the hydraulic cylinder outlet, and a pressure sensor is arranged between the hydraulic cylinder and the pressure maintaining electromagnetic valve to monitor the pressure of the hydraulic cylinder. In the pressure maintaining process, the pressure maintaining electromagnetic valve is closed, the leakage of electromagnetic valves in all branch oil paths leading to the oil tank is concentrated on this pressure maintaining electromagnetic valve, and the oil leakage first passes through the pressure maintaining electromagnetic valve on the main oil path of the hydraulic cylinder outlet, greatly reducing the oil leakage through multiple electromagnetic valves, reducing the oil pressure in each branch, further reducing the oil leakage in the pressure maintaining state under high pressure, and increasing the stability of the system. At the same time, the number of accumulator pressure compensation is reduced, the number of pressure compensation by the second electromagnetic reversing valve, pressure relief by the first electromagnetic reversing valve and the start of the electric proportional speed regulating valve is reduced, thereby reducing the start frequency of the motor in the pressure maintaining state, increasing the service life of the equipment, and reducing the energy consumption. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 Structure schematic diagram of the hydraulic drive system of the laminating machine of an embodiment.

[0033] Figure 2 Structure schematic diagram of the hydraulic drive system of the laminating machine of an embodiment in the initial state.

[0034] Figure 3 Structure schematic diagram of the hydraulic drive system of the laminating machine of an embodiment in the fast rising state.

[0035] Figure 4 Structure schematic diagram of the hydraulic drive system of the laminating machine of an embodiment in the slow pressure combining state.

[0036] Figure 5 Structure schematic diagram of the hydraulic drive system of the laminating machine of an embodiment in the pressure adding state.

[0037] Figure 6 Structure schematic diagram of the hydraulic drive system of the laminating machine of an embodiment in the energy storage state.

[0038] Figure 7 Structure schematic diagram of the hydraulic drive system of the laminating machine of an embodiment in the pressure maintaining-pressure compensating state.

[0039] Figure 8 Structure schematic diagram of the hydraulic drive system of the laminating machine of an embodiment in the pressure maintaining-pressure relieving state.

[0040] Figure 9 Structure schematic diagram of the hydraulic drive system of the laminating machine of an embodiment in the pressure relieving state.

[0041] Figure 10 Structure schematic diagram of the hydraulic drive system of the laminating machine of an embodiment in the fast falling state.

[0042] BRIEF DESCRIPTION OF DRAWINGS

[0043] 1. High pressure oil circuit; 11, first oil pipe; 12, second oil pipe; 13, first one-way valve; 14, electric proportional speed regulating valve; 15, first electromagnetic reversing valve; 16, second electromagnetic reversing valve; 17, second one-way valve; 18, filter; 19, third electromagnetic reversing valve;

[0044] 2. Accumulator oil circuit; 21, third oil pipe; 22, accumulator; 23, one-way speed regulating valve; 24, pressure switch; 25, first stop valve; 26, second overflow valve;

[0045] 3. Pressure reducing oil circuit; 31, fourth oil pipe; 32, first two-way cartridge valve; 33, cover plate; 34, fourth electromagnetic reversing valve; 35, third overflow valve; 36, second stop valve;

[0046] 4. Low pressure oil circuit; 41, fifth oil pipe; 42, sixth oil pipe; 43, third one-way valve; 44, second two-way cartridge valve; 45, first overflow valve; 46, fifth electromagnetic reversing valve;

[0047] 100, driving mechanism; 101, electric motor; 102, high pressure pump; 103, low pressure pump; 104, bell housing; 105, coupling;

[0048] 200, oil tank;

[0049] 300, hydraulic cylinder;

[0050] 400, pressure sensor; 401, pressure gauge; 402, oil drain ball valve; 403, liquid level gauge; 404, air cleaner; 405, liquid level switch;

[0051] 500, pressure maintaining electromagnetic valve. DETAILED DESCRIPTION

[0052] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that the present application can be practiced without some or all of these specific details. In other instances, well known process steps have not been described in detail in order not to unnecessarily obscure the present application.

[0053] In the description of the application, it should be understood that, if there are these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0054] In addition, if there are these terms "first", "second", these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the application, if the term "multiple" appears, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0055] In this application, unless otherwise explicitly specified and limited, if there are terms such as "mounting", "connecting", "connecting", "fixing" and the like, these terms should be broadly understood. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0056] In this application, unless otherwise explicitly specified and limited, if there are similar descriptions such as "first feature on or under second feature", the meaning can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" of the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" of the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0057] It is to be noted that when an element such as a layer, region or substrate is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element or intervening elements can be present. In addition, it is to be noted that when a layer is referred to as being "formed on" or "formed over" another layer, it can be directly formed on or over the other layer or intervening layers can be present. Like reference numerals refer to like elements throughout the specification. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. As used herein, the term "includes" has the same meaning as "comprising" and "including".

[0058] Referring to Figure 1 , Figure 1 A schematic diagram of a hydraulic drive system of a laminating machine is shown in an embodiment of the present application. The hydraulic drive system provided in an embodiment of the present application includes a driving mechanism 100, an oil tank 200, a hydraulic cylinder 300, a pressure maintaining solenoid valve 500, a pressure sensor 400, a high pressure oil line 1 and a low pressure oil line 4. The oil tank 200 is used to store oil, and the hydraulic cylinder 300 is used to provide a pressing driving force. The low pressure oil line 4 and the high pressure oil line 1 are respectively connected to the hydraulic cylinder 300. The driving mechanism 100 is respectively connected to the oil tank 200, the low pressure oil line 4 and the high pressure oil line 1, so that the oil in the oil tank 200 can be supplied to the low pressure oil line 4 and the high pressure oil line 1 through the driving mechanism 100. The low pressure oil line 4 and the high pressure oil line 1 are used to adjust the pressure in the hydraulic cylinder 300, so that the hydraulic drive system has multiple working states. The pressure sensor 400 is used to detect the pressure of the hydraulic cylinder 300. The pressure maintaining solenoid valve 500 is arranged at the inlet of the hydraulic cylinder 300 and then communicates with each oil line. The high pressure oil line 1 includes a first oil pipe 11, an electric proportional speed regulating valve 14 and multiple first one-way valves 13. The two ends of the first oil pipe 11 are respectively connected to the hydraulic cylinder 300 and the driving mechanism 100, and the electric proportional speed regulating valve 14 and the first one-way valves 13 are arranged in the first oil pipe 11. The first one-way valves 13 are provided in multiple, and the multiple first one-way valves 13 and the electric proportional speed regulating valve 14 form a bridge type flow control unit, which is used to control the flow rate of the oil flowing through the first oil pipe 11.

[0059] The hydraulic drive system of the laminator described above has the following states in actual use: fast pressing, slow pressing, pressurizing, pressure maintaining and pressure compensating, pressure maintaining and pressure releasing, pressure releasing, and fast pressure reducing. First, the laminated board to be pressed is placed in the pressing position, and then the opening signal of the electric proportional speed regulating valve 14 (the bridge type flow control unit controls the flow rate of the oil flowing through the first oil pipe 11) is controlled to control the oil flow rate of the high-pressure oil circuit 1 to the hydraulic cylinder 300, so as to switch between the above states. The hydraulic cylinder 300 generates pressure on the laminated board to be pressed mainly through fast pressing and slow pressing. The pressure maintaining solenoid valve 500 is always open to realize fast pressing, slow pressing, and pressurizing of the hydraulic cylinder 300 to adapt to the requirements of pressure changes in the process flow. The pressure is increased to the set pressure, and the pressure on the laminated board to be pressed is constant during the pressure maintaining process. If the pressure sensor 400 monitors an increase or decrease in the pressure on the laminated board to be pressed, the pressure sensor 400 signal is compared with the set value, and the signal of the electric proportional speed regulating valve 14 is controlled to realize pressure compensation or pressure release in the pressure maintaining state. The pressure maintaining solenoid valve 500 is always open to ensure stable pressure compensation or pressure release in the pressure maintaining state. After the pressing is completed, pressure release and fast pressure reduction are required. In this process, the oil in the hydraulic cylinder 300 mainly flows back to the oil tank 200, so that the hydraulic cylinder 300 retracts to the initial position, and finally the pressing process is completed. The laminated board to be pressed is taken out. In the hydraulic drive system of the laminator of the present application, the pressure maintaining solenoid valve 500 for stabilizing the pressure maintaining process is arranged on the main oil circuit at the outlet of the hydraulic cylinder 300, and the pressure sensor 400 is arranged between the hydraulic cylinder 300 and the pressure maintaining solenoid valve 500 to monitor the pressure of the hydraulic cylinder 300. The pressure maintaining solenoid valve 500 is closed during the pressure maintaining process, and the leakage of the electromagnetic valves in all branch oil circuits leading to the oil tank 200 is concentrated on this pressure maintaining solenoid valve 500. The oil leakage first passes through the pressure maintaining solenoid valve 500 on the main oil circuit at the outlet of the hydraulic cylinder 300, greatly reducing the oil leakage only through multiple first one-way valves 13 and other electromagnetic valves, and further reducing the oil pressure in each branch, further reducing the oil leakage in the stable pressure state under high pressure, and increasing the stability of the system.

[0060] In an embodiment, four first one-way valves 13 are provided, and the electric proportional speed regulating valve 14 has a first port and a second port, wherein the output ends of two of the first one-way valves 13 are connected to the first oil pipe 11 respectively, and the input ends of the corresponding two first one-way valves 13 are connected to form a first connecting portion; the input ends of the other two first one-way valves 13 are connected to the first oil pipe 11 respectively, and the output ends of the corresponding two first one-way valves 13 are connected to form a second connecting portion. The first port of the electric proportional speed regulating valve 14 is connected to the first connecting portion, and the second port of the electric proportional speed regulating valve 14 is connected to the second connecting portion to form a bridge type flow control unit. In this embodiment, the bridge type flow control unit is formed by connecting the plurality of first one-way valves 13 and the electric proportional speed regulating valve 14 to each other, so that the flow rate of the oil flowing through the first oil pipe 11 can be controlled by the bridge type flow control unit, which has high control precision, and the control of the oil flow rate can be realized by using only one electric proportional speed regulating valve 14 in combination with a controller, thereby reducing the number of components used and lowering the cost.

[0061] In an embodiment, the high-pressure oil circuit 1 includes a first oil pipe 11, a second oil pipe 12, an electric proportional speed regulating valve 14, first one-way valves 13, a second one-way valve 17, a first electromagnetic reversing valve 15, a second electromagnetic reversing valve 16, a third electromagnetic reversing valve 19, and a filter 18. One end of the second oil pipe 12 is connected to the first oil pipe 11 at the input end of the second one-way valve 17, and the other end of the second oil pipe 12 is connected to an oil tank 200. The third electromagnetic reversing valve 19 is arranged in the second oil pipe 12, and the third electromagnetic reversing valve 19 is a normally open type. Both ends of the first oil pipe 11 are connected to a hydraulic cylinder 300 and a high-pressure pump 102 respectively. The electric proportional speed regulating valve 14, the first one-way valves 13, the second one-way valve 17, the first electromagnetic reversing valve 15, the second electromagnetic reversing valve 16, and the filter 18 are arranged in the first oil pipe 11 respectively. The first one-way valves 13 are provided in plurality, and the plurality of first one-way valves 13 and the electric proportional speed regulating valve 14 form a bridge type flow control unit, which is used to control the flow rate of the oil flowing through the first oil pipe 11. The first electromagnetic reversing valve 15 is located between the hydraulic cylinder 300 and the bridge type flow control unit, the second electromagnetic reversing valve 16 is located between the bridge type flow control unit and the high-pressure pump 102, the second one-way valve 17 is located between the second electromagnetic reversing valve 16 and the high-pressure pump 102, and the filter 18 is located between the second one-way valve 17 and the high-pressure pump 102. The filter 18 is used to filter the oil output by the high-pressure pump 102 to improve the cleanliness of the oil.

[0062] In an embodiment, the hydraulic drive system further comprises an energy storage oil path 2 connected with the high-pressure oil path 1 and a pressure reduction oil path 3 connected with the hydraulic cylinder 300 and the oil tank 200 respectively. The low-pressure oil path 4, the high-pressure oil path 1, the energy storage oil path 2 and the pressure reduction oil path 3 are used to adjust the pressure in the hydraulic cylinder 300, so that the hydraulic drive system has multiple working states.

[0063] The energy storage oil path 2 in the present application comprises a third oil pipe 21, an energy accumulator 22, a pressure switch 24, a one-way speed regulating valve 23, a second overflow valve 26 and a first stop valve 25. The third oil pipe 21 is connected with the first oil pipe 11 between the second electromagnetic reversing valve 16 and the second one-way valve 17, the energy accumulator 22 is connected with the third oil pipe 21 through the one-way speed regulating valve 23, and is used to pre-store oil for standby. The pressure switch 24 is connected with the energy accumulator 22, so that the pressure of the energy accumulator 22 can be detected through the pressure switch 24. The second overflow valve 26 is connected between the third oil pipe 21 and the second oil pipe 12, and the first stop valve 25 and the second overflow valve 26 are connected in parallel between the third oil pipe 21 and the second oil pipe 12.

[0064] During the process of filling the energy accumulator 22 with oil, when the third electromagnetic reversing valve 19 is de-energized, the third electromagnetic reversing valve 19 is opened, the high-pressure pump 102 is in an unloading state, and the oil provided by the high-pressure pump 102 flows back to the oil tank 200 through the third electromagnetic reversing valve 19. When the third electromagnetic reversing valve 19 is energized, the third electromagnetic reversing valve 19 is closed, the high-pressure pump 102 is in a working state, and the oil flows to the energy accumulator 22 through the second one-way valve 17 and the one-way speed regulating valve 23, so that the energy accumulator 22 can be filled with oil. The one-way speed regulating valve 23 is used to realize fast filling and slow discharging of the energy accumulator 22, so as to suppress the discharging impact. The pressure switch 24 is used to monitor the pressure of the energy accumulator 22. When the pressure switch 24 detects that the pressure value of the energy accumulator 22 is higher than a threshold value, the electric motor 101 is stopped; when the pressure switch 24 detects that the pressure value of the energy accumulator 22 is lower than the threshold value, the electric motor 101 is started to fill the energy accumulator 22 with oil. The second overflow valve 26 is used to control the maximum pressure at which the high-pressure pump 102 works, and the first stop valve 25 is in a normally closed state when working. In order to consider safety, when power is off for maintenance, the first stop valve 25 is first opened, so that the oil stored in the energy accumulator 22 can be released, so as to completely release the system.

[0065] When the second electromagnetic directional valve 16 is energized, the oil can be sent from the P port of the second electromagnetic directional valve 16 to the A port, and then can enter the bridge type flow control unit composed of the plurality of first one-way valves 13 and the electric proportional speed regulating valve 14. The control signal of the electric proportional speed regulating valve 14 can change the oil flow through the first oil pipe 11 (the minimum control flow resolution can reach 0.1 L / min, and the control accuracy of the oil pressure of the hydraulic cylinder 300 ± 1 bar can be realized). When the first electromagnetic directional valve 15 is not energized, it is in a one-way flow state, and the oil can be sent from the port of the first electromagnetic directional valve 15 to the hydraulic cylinder 300 for loading. When the second electromagnetic directional valve 16 is not energized, the P port of the second electromagnetic directional valve 16 blocks the high-pressure pump 102 and the downstream circuit, which meets the liquid charging working condition of the accumulator 22. At the same time, the A port of the second electromagnetic directional valve 16 is connected to the T port, which releases the pressure at the 1 port of the first electromagnetic directional valve 15, so that the first electromagnetic directional valve 15 is quickly closed and the pressure is reliably maintained.

[0066] In an embodiment, the pressure reduction oil circuit 3 includes a fourth oil pipe 31 and a large-flow on-off throttle valve. One end of the fourth oil pipe 31 is connected to the hydraulic cylinder 300, and the other end of the fourth oil pipe 31 is connected to the oil tank 200. The large-flow on-off throttle valve is arranged in the fourth oil pipe 31, and an output end of the large-flow on-off throttle valve is connected to the second electromagnetic directional valve 16.

[0067] In an embodiment, the large flow switching spool valve comprises a first two-way cartridge valve 32, a cover plate 33 and a fourth electromagnetic reversing valve 34, which are arranged in cooperation for controlling the flow of oil through the fourth oil pipe 31. The pressure reducing oil circuit 3 further comprises a third overflow valve 35 and a second stop valve 36, which are connected in parallel between the first oil pipe 11 and the fourth oil pipe 31. When the fourth electromagnetic reversing valve 34 is not powered, the oil in the hydraulic cylinder 300 is sent to the spring cavity of the valve core of the first two-way cartridge valve 32 through the fourth electromagnetic reversing valve 34. Due to the area ratio and the spring effect, the first two-way cartridge valve 32 is closed to reliably cut off the oil circuit between the hydraulic cylinder 300 and the oil tank 200. When the fourth electromagnetic reversing valve 34 is powered, the pilot oil in the first two-way cartridge valve 32 flows from the A port to the T port of the fourth electromagnetic reversing valve 34 and then flows back to the oil tank 200. The pilot oil pressure is released, and the oil in the hydraulic cylinder 300 can return to the oil tank 200 by overcoming only the 0.5 bar spring of the first two-way cartridge valve 32, so that the fast retraction of the hydraulic cylinder 300 can be realized. At the same time, the adjusting rod of the cover plate 33 is used to adjust the displacement of the first two-way cartridge valve 32 to adjust the flow of this pressure reduction process, and the fast retraction speed of the hydraulic cylinder 300 can be adjusted. The third overflow valve 35 functions as a safety valve to control the pressure in the hydraulic cylinder 300 not to exceed its set value. The second stop valve 36 is normally closed during operation and can be opened during power failure maintenance to release the pressure of the hydraulic cylinder 300 and slowly retract the hydraulic cylinder 300, meeting the maintenance needs.

[0068] In an embodiment, the low-pressure oil circuit 4 comprises a fifth oil pipe 41, a sixth oil pipe 42, a third one-way valve 43 and a large flow electromagnetic overflow valve. The two ends of the fifth oil pipe 41 are connected with the low-pressure pump 103 and the hydraulic cylinder 300 respectively. The two ends of the sixth oil pipe 42 are connected with the low-pressure pump 103 and the oil tank 200 respectively. The third one-way valve 43 is arranged in the fifth oil pipe 41, and the large flow electromagnetic overflow valve is arranged in the sixth oil pipe 42.

[0069] In an embodiment, the large flow electromagnetic spill valve includes a second two-way cartridge valve 44, a first spill valve 45 and a fifth electromagnetic reversing valve 46, which are cooperatively arranged to control the flow of oil through the sixth oil pipe 42. When the fifth electromagnetic reversing valve 46 is de-energized, the pilot control oil of the second two-way cartridge valve 44 flows from the P port to the A port of the fifth electromagnetic reversing valve 46 back to the oil tank 200, at this time, the oil flow provided by the low-pressure pump 103 only needs to overcome the 0.5 bar spring above the main valve core to open the main valve core, so that the oil flows back to the oil tank 200, at this time, it is in a large flow unloading state. When the fifth electromagnetic reversing valve 46 is energized, the pilot control oil of the second two-way cartridge valve 44 is blocked at the B port of the fifth electromagnetic reversing valve 46, and the first spill valve 45 can only be opened when the pressure of the oil rises to the set pressure of the first spill valve 45. The pilot control oil of the second two-way cartridge valve 44 flows back to the oil tank 200 through the first spill valve 45, so that the valve core of the second two-way cartridge valve 44 can be opened, at this time, it is in a large flow spill state. The third one-way valve 43 can realize one-way flow of the low-pressure pump 103, and has the functions of protecting the low-pressure pump 103 and maintaining the pressure of the hydraulic cylinder 300.

[0070] In an embodiment, the drive mechanism 100 includes a motor 101, a high-pressure pump 102, a low-pressure pump 103, a bell cover 104 and a shaft coupling 105. The high-pressure pump 102 is connected with the oil tank 200 and the high-pressure oil circuit 1, so that the high-pressure pump 102 can provide high-pressure and low-flow working oil for the high-pressure oil circuit 1. The low-pressure pump 103 is connected with the oil tank 200 and the low-pressure oil circuit 4, so that the low-pressure pump 103 can provide low-pressure and large-flow working oil for the low-pressure oil circuit 4. The motor 101 is connected with the high-pressure pump 102 and the low-pressure pump 103 through the shaft coupling 105, and is used to control the operation of the high-pressure pump 102 and the low-pressure pump 103. The bell cover 104 is arranged on the shaft coupling 105. Figure 2 In the embodiment, the oil provided by the low-pressure pump 103 enters the low-pressure oil circuit 4 from P1, and the oil provided by the high-pressure pump 102 enters the high-pressure oil circuit 1 from P2.

[0071] The application can reduce the number of times of pressure compensation of the accumulator 22, the number of times of pressure compensation of the second electromagnetic reversing valve 16, the number of times of pressure relief of the first electromagnetic reversing valve 15 and the number of times of starting of the electric proportional speed regulating valve 14, thereby reducing the starting frequency of the motor 101 in the pressure maintaining state, increasing the service life of the equipment, and reducing the energy consumption.

[0072] Referring to Figure 2As shown, the hydraulic drive system of the laminating machine further comprises a pressure gauge 401, a drain ball valve 402, a liquid level gauge 403, an air filter 404 and a liquid level switch 405. The pressure gauge 401 is connected to the fifth oil pipe 41 for detecting the pressure in the fifth oil pipe 41. The drain ball valve 402 is connected to the oil tank 200 for releasing the oil in the oil tank 200. The liquid level gauge 403 is arranged in the oil tank 200 for marking the liquid level of the oil tank 200, so as to clearly and intuitively show the liquid level of the hydraulic oil in the oil tank 200, and enable the operator to know the amount of the oil in the oil tank 200 at any time, so as to timely supplement the oil. The liquid level switch 405 is connected with the oil tank 200, and is set with upper and lower limit values of the liquid level. When the liquid level reaches or exceeds the upper or lower limit position, the liquid level switch 405 triggers and sends a signal to remind the operator that the liquid level is abnormal, for example, the liquid level is too low, which may cause the oil pump to be vacuumed, or the liquid level is too high, which may cause the oil tank to overflow. The air filter 404 is arranged in the oil tank 200 to enable the inside of the oil tank 200 to communicate with the atmosphere, and to filter the air entering the oil tank 200.

[0073] In actual use, various working states of the hydraulic drive system of the laminating machine are described as follows, and the arrows in the figures are the flow directions of the oil:

[0074] Referring to Figure 2 As shown, when the hydraulic drive system of the laminating machine is in the initial state, the motor 101 is started, the fifth electromagnetic reversing valve 46 is de-energized, the P port and the A port are communicated, the pilot oil of the second two-way cartridge valve 44 flows from the P port to the A port through the fifth electromagnetic reversing valve 46, and then flows back to the oil tank 200, so that the second two-way cartridge valve 44 is opened, and the oil provided by the low-pressure pump 103 flows back to the oil tank 200 through the second two-way cartridge valve 44. The third electromagnetic reversing valve 19 is de-energized to be opened, and the oil provided by the high-pressure pump 102 flows back to the oil tank 200 through the filter 18 and the third electromagnetic reversing valve 19.

[0075] Referring to Figure 3 As shown, when the hydraulic drive system of the laminating machine is in the fast pressing state, the motor 101 is started, the fifth electromagnetic reversing valve 46 is connected to the power supply, the third electromagnetic reversing valve 19 is connected to the power supply, the second electromagnetic reversing valve 16 is connected to the power supply, and the opening degree signal of the electric proportional speed regulating valve 14 becomes maximum. At this time, the oil provided by the low-pressure pump 103 flows to the hydraulic cylinder 300 through the third one-way valve 43, and the pressure maintaining electromagnetic valve 500 is always in the opened state in this process. The oil provided by the high-pressure pump 102 flows to the hydraulic cylinder 300 through the filter 18, the second one-way valve 17, the second electromagnetic reversing valve 16, the bridge type flow control unit and the first electromagnetic reversing valve 15, that is, the oil flow provided by the low-pressure pump 103 and the high-pressure pump 102 can be rapidly sent to the hydraulic cylinder 300, and the pressure maintaining electromagnetic valve 500 is always in the opened state in this process, so as to realize the fast pressing of the hydraulic cylinder 300.

[0076] Referring to Figure 4 As shown in the figure, when the hydraulic drive system of the laminating machine is in the slow pressing state, the motor 101 is started, the fifth electromagnetic reversing valve 46 is in the initial state, i.e., power off, the low-pressure pump 103 is running, and the oil provided by the low-pressure pump 103 flows back to the oil tank 200 through the second two-way cartridge valve 44. The third electromagnetic reversing valve 19 is connected to the power supply, the second electromagnetic reversing valve 16 is connected to the power supply, and the opening degree signal of the control electric proportional speed regulating valve 14 is slightly smaller than that in the fast pressing state. At this time, the oil provided by the high-pressure pump 102 flows to the hydraulic cylinder 300 through the filter 18, the second one-way valve 17, the second electromagnetic reversing valve 16, the bridge type flow control unit, the first electromagnetic reversing valve 15, and the pressure maintaining electromagnetic valve 500. The pressure maintaining electromagnetic valve 500 is always in the open state during the process to achieve the slow pressing of the hydraulic cylinder 300.

[0077] Referring to Figure 5 As shown in the figure, when the hydraulic drive system of the laminating machine is in the slow pressing state, the motor 101 is started, the fifth electromagnetic reversing valve 46 is in the initial state, i.e., power off, the low-pressure pump 103 is running, and the oil provided by the low-pressure pump 103 flows back to the oil tank 200 through the second two-way cartridge valve 44. The third electromagnetic reversing valve 19 is connected to the power supply, the second electromagnetic reversing valve 16 is connected to the power supply, and the opening degree signal of the control electric proportional speed regulating valve 14 is slightly smaller than that in the fast pressing state. At this time, the oil provided by the high-pressure pump 102 flows to the hydraulic cylinder 300 through the filter 18, the second one-way valve 17, the second electromagnetic reversing valve 16, the bridge type flow control unit, the first electromagnetic reversing valve 15, and the pressure maintaining electromagnetic valve 500. The pressure maintaining electromagnetic valve 500 is always in the open state during the process to achieve the slow pressing of the hydraulic cylinder 300.

[0078] Referring to Figure 6As shown, when the hydraulic drive system of the laminator is in the charging state, the pressure state of the accumulator 22 is detected by the pressure switch 24, if the pressure switch 24 detects that the pressure value of the accumulator 22 is less than the low pressure threshold value, the motor 101 is started, the fifth electromagnetic reversing valve 46 is de-energized, and the low pressure pump 103 is in the unloading state. The third electromagnetic reversing valve 19 is energized to be closed, the second electromagnetic reversing valve 16 is de-energized, and the oil provided by the high pressure pump 102 flows to the accumulator 22 through the filter 18 and the second check valve 17 to realize the oil charging of the accumulator 22. If the pressure switch 24 detects that the pressure value of the accumulator 22 is greater than the high pressure threshold value, the motor 101 stops running, that is, the oil charging of the accumulator 22 is stopped.

[0079] The pressure maintaining-pressure compensating and pressure maintaining-pressure releasing states of the hydraulic drive system of the laminator are to ensure the stability of the system pressure. When the deviation between the measured pressure and the set pressure of the system is greater than the set value in the pressure maintaining state, the system automatically performs the pressure compensating or releasing process, and the motor 101 does not act. The hydraulic drive system is in the pressure maintaining state for a long time, and the pressure maintaining electromagnetic valve 500 is always in the closed state in the pressure maintaining state.

[0080] Referring to Figure 7 As shown, when the hydraulic drive system of the laminator is in the pressure maintaining-pressure compensating state, the motor 101 is stopped, and the pressure of the hydraulic cylinder 300 is detected by the pressure sensor 400. When the pressure of the hydraulic cylinder 300 is lower than the control target value 1 bar (the specific value can be set according to the demand), the electric proportional speed regulating valve 14 is adjusted to be a small signal. Specifically, the opening degree of the electric proportional speed regulating valve 14 is automatically set according to the comparison difference between the pressure value measured by the pressure sensor 400 and the system set value. The difference starts from 1 bar (this value can be set by the user) to 0 bar, and the electric proportional speed regulating valve 14 is finally automatically set to 0, without overshoot. The second electromagnetic reversing valve 16 is energized for a short time. At this time, the oil in the accumulator 22 flows to the hydraulic cylinder 300 through the second electromagnetic reversing valve 16, the bridge type flow control unit, the first electromagnetic reversing valve 15 and the pressure maintaining electromagnetic valve 500. When the pressure of the hydraulic cylinder 300 rises to the target value, the second electromagnetic reversing valve 16 is de-energized, and all valves are closed.

[0081] Referring to Figure 8 As shown, when the hydraulic drive system of the laminator is in the pressure maintaining-pressure releasing state, the motor 101 is stopped, and the pressure of the hydraulic cylinder 300 is detected by the pressure sensor 400. When the pressure of the hydraulic cylinder 300 is higher than the control target value 1 bar, the electric proportional speed regulating valve 14 is adjusted to be a small signal according to the pressure compensating logic setting. The first electromagnetic reversing valve 15 is energized for a short time. At this time, the oil in the hydraulic cylinder 300 flows back to the oil tank 200 through the pressure maintaining electromagnetic valve 500, the first electromagnetic reversing valve 15, the bridge type flow control unit and the second electromagnetic reversing valve 16. When the pressure of the hydraulic cylinder 300 decreases to the target value, the first electromagnetic reversing valve 15 is de-energized, and all valves are closed.

[0082] Referring to Figure 9 As shown in FIG. 6, when the hydraulic driving system of the laminating machine is in a pressure relief state, the motor 101 is stopped, the first electromagnetic reversing valve 15 is connected to the power supply, the control electric proportional speed regulating valve 14 is increased from a small signal to a large signal, and the opening degree of the electric proportional speed regulating valve 14 is set to be consistent with the slow pressure bonding state. At this time, the oil in the hydraulic cylinder 300 flows back to the oil tank 200 through the pressure maintaining electromagnetic valve 500, the first electromagnetic reversing valve 15, the bridge type flow control unit, and the second electromagnetic reversing valve 16, the pressure of the hydraulic cylinder 300 is changed from slow to fast, the pressure is released, and the working state of the pressure relief is the same as that of the pressure maintaining-pressure relief, only the signal of the electric proportional speed regulating valve 14 is changed.

[0083] Referring to Figure 10 As shown in FIG. 7, when the hydraulic driving system of the laminating machine is in a fast pressure relief state, the motor 101 is stopped, the electric proportional speed regulating valve 14 and the first electromagnetic reversing valve 15 are closed, the pressure maintaining electromagnetic valve 500 is kept connected, and the fourth electromagnetic reversing valve 34 is connected to the power supply. At this time, the oil in the hydraulic cylinder 300 quickly flows back to the oil tank 200 through the fourth electromagnetic reversing valve 34 and the first two-way cartridge valve 32, that is, the pressure of the hydraulic cylinder 300 is quickly released to the oil tank 200 through the first two-way cartridge valve 32, and the hydraulic cylinder 300 quickly retracts to the initial position.

[0084] In this embodiment, the first electromagnetic reversing valve 15 and the second electromagnetic reversing valve 16 cooperate with the high-precision electric proportional speed regulating valve 14, and the PLC control program is combined, so that the pressure rising and falling speed of the hydraulic cylinder 300 can be accurately controlled and timely adjusted, the element configuration is simplified, and the pressure maintaining capacity of the system is greatly improved. Meanwhile, the pressure maintaining electromagnetic valve 500 for stabilizing the pressure maintaining process is arranged on the main oil line at the outlet of the hydraulic cylinder 300, and the pressure sensor 400 is arranged between the hydraulic cylinder 300 and the pressure maintaining electromagnetic valve 500 to monitor the pressure of the hydraulic cylinder 300, optimize the pressure maintaining function, and start the pressure maintaining electromagnetic valve 500 as soon as any one is opened, and the pressure maintaining state is to close the pressure maintaining electromagnetic valve 500.

[0085] Correspondingly, the embodiment of the application further discloses a laminating machine, which comprises a hot plate, a pressure bonding assembly, and a hydraulic driving system as described in any of the above embodiments.

[0086] The technical features of the above-mentioned embodiments can be combined in any manner. In order to make the description simple, all possible combinations of the technical features in the above-mentioned embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

[0087] The above embodiments only express several implementation ways of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation to the patent scope of the application. It should be pointed out that for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, which all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A hydraulic drive system for a laminator, characterized by, The hydraulic drive system of the laminator comprises: an oil tank (200) for storing oil; a hydraulic cylinder (300) for providing driving force for pressing the boards to be laminated; a low-pressure oil circuit (4) connected with the hydraulic cylinder (300); a high-pressure oil circuit (1) connected with the hydraulic cylinder (300); a driving mechanism (100) connected with the oil tank (200), the low-pressure oil circuit (4) and the high-pressure oil circuit (1) respectively, the driving mechanism (100) being used for supplying the oil in the oil tank (200) to the low-pressure oil circuit (4) and the high-pressure oil circuit (1); a pressure maintaining solenoid valve (500) arranged at an inlet of the hydraulic cylinder (300); a pressure sensor (400) arranged between the hydraulic cylinder (300) and the pressure maintaining solenoid valve (500); wherein the high-pressure oil circuit (1) comprises a first oil pipe (11), a plurality of first one-way valves (13) and an electric proportional speed regulating valve (14), two ends of the first oil pipe (11) are connected with the hydraulic cylinder (300) and the driving mechanism (100) respectively, the plurality of first one-way valves (13) and the electric proportional speed regulating valve (14) form a bridge type flow control unit, the bridge type flow control unit is arranged in the first oil pipe (11), and the bridge type flow control unit is used for controlling the flow rate of the oil flowing through the first oil pipe (11).

2. The hydraulic drive system of a laminator according to claim 1, characterized in that, The first one-way valve (13) is provided with four first one-way valves (13), and the electric proportional speed regulating valve (14) has a first port and a second port; two output ends of the first one-way valves (13) are connected with the first oil pipe (11) respectively, and two input ends of the first one-way valves (13) are connected to form a first connecting part; two input ends of the first one-way valves (13) are connected with the first oil pipe (11) respectively, and two output ends of the first one-way valves (13) are connected to form a second connecting part; the first port of the electric proportional speed regulating valve (14) is connected with the first connecting part, the second port of the electric proportional speed regulating valve (14) is connected with the second connecting part, and the bridge type flow control unit is formed.

3. The hydraulic drive system for a laminator according to claim 1, wherein, The hydraulic drive system of the laminator, the high-pressure oil circuit (1) further comprises a first electromagnetic reversing valve (15), a second electromagnetic reversing valve (16), a second one-way valve (17) and a filter (18), the first electromagnetic reversing valve (15) is arranged in the first oil pipe (11) between the hydraulic cylinder (300) and the bridge type flow control unit, the second electromagnetic reversing valve (16) is arranged in the first oil pipe (11) between the bridge type flow control unit and the driving mechanism (100), the second one-way valve (17) is arranged in the first oil pipe (11) between the second electromagnetic reversing valve (16) and the driving mechanism (100), and the filter (18) is arranged in the first oil pipe (11) between the second one-way valve (17) and the driving mechanism (100).

4. The hydraulic drive system of a laminator according to claim 3, wherein, The hydraulic drive system of the laminating machine, the high-pressure oil path (1) further comprises a second oil pipe (12) and a third electromagnetic reversing valve (19), one end of the second oil pipe (12) is connected with the first oil pipe (11) of the input end of the second check valve (17), the other end of the second oil pipe (12) is connected with the oil tank (200), and the third electromagnetic reversing valve (19) is arranged on the second oil pipe (12).

5. The hydraulic drive system of a laminator according to claim 3, wherein, The hydraulic drive system of the laminating machine, the hydraulic drive system further comprises an energy storage oil path (2), and the energy storage oil path (2) is connected with the first oil pipe (11) between the second electromagnetic reversing valve (16) and the second check valve (17).

6. The hydraulic drive system of a laminator according to claim 5, wherein, The hydraulic drive system of the laminating machine, the energy storage oil path (2) comprises a third oil pipe (21), an energy accumulator (22), a pressure switch (24) and a one-way speed regulating valve (23), the third oil pipe (21) is connected with the first oil pipe (11) between the second electromagnetic reversing valve (16) and the second check valve (17), the energy accumulator (22) is connected with the third oil pipe (21) through the one-way speed regulating valve (23), and the pressure switch (24) is connected with the energy accumulator (22) and used for detecting the pressure of the energy accumulator (22).

7. The hydraulic drive system of a laminator according to claim 3, wherein, The hydraulic drive system of the laminating machine, the hydraulic drive system further comprises a pressure reduction oil path (3), the pressure reduction oil path (3) is connected with the hydraulic cylinder (300) and the oil tank (200) respectively, and the second electromagnetic reversing valve (16) is connected with the pressure reduction oil path (3).

8. The hydraulic drive system of a laminator according to claim 7, wherein, The hydraulic drive system of the laminating machine, the pressure reduction oil path (3) comprises a fourth oil pipe (31) and a large-flow on-off throttling valve, one end of the fourth oil pipe (31) is connected with the hydraulic cylinder (300), the other end of the fourth oil pipe (31) is connected with the oil tank (200), the large-flow on-off throttling valve is arranged on the fourth oil pipe (31), and the second electromagnetic reversing valve (16) is connected with the fourth oil pipe (31) of the output end of the large-flow on-off throttling valve.

9. The hydraulic drive system of a laminator according to claim 8, wherein, The hydraulic drive system of the laminating machine, the large-flow on-off throttling valve comprises a first two-way cartridge valve (32), a cover plate (33) and a fourth electromagnetic reversing valve (34), the first two-way cartridge valve (32), the fourth electromagnetic reversing valve (34) and the cover plate (33) are arranged in cooperation and used for controlling the flow of oil flowing through the fourth oil pipe (31).

10. The hydraulic drive system of a laminator according to claim 1, wherein, The low-pressure oil path (4) comprises a fifth oil pipe (41), a sixth oil pipe (42), a third check valve (43) and a large-flow electromagnetic overflow valve, both ends of the fifth oil pipe (41) are connected with the driving mechanism (100) and the hydraulic cylinder (300) respectively, both ends of the sixth oil pipe (42) are connected with the driving mechanism (100) and the oil tank (200) respectively, the third check valve (43) is arranged on the fifth oil pipe (41), and the large-flow electromagnetic overflow valve is arranged on the sixth oil pipe (42).

11. The hydraulic drive system of a laminator according to claim 10, wherein, The large-flow electromagnetic overflow valve comprises a second two-way cartridge valve (44), a first overflow valve (45) and a fifth electromagnetic reversing valve (46), which are arranged in cooperation for controlling the flow size of the oil flowing through the sixth oil pipe (42).

12. The hydraulic drive system of a laminator according to any of claims 1-11, characterized in that, The hydraulic driving system of the laminating machine comprises a motor (101), a high-pressure pump (102) and a low-pressure pump (103), the high-pressure pump (102) is connected with the oil tank (200) and the high-pressure oil path (1) respectively for providing oil for the high-pressure oil path (1), the low-pressure pump (103) is connected with the oil tank (200) and the low-pressure oil path (4) respectively for providing oil for the low-pressure oil path (4), and the motor (101) is connected with the high-pressure pump (102) and the low-pressure pump (103) respectively.

13. A laminator characterized by comprising: The hydraulic driving system comprises a heat disc and any one of claims 1-12.

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