Oil cylinder for oil press and hydraulic system and pressurizing method thereof

Abstract

The invention relates to the technical field of hydraulic pressure, and discloses an oil cylinder for an oil press, a hydraulic system of the oil cylinder and a pressurizing method, a protection frame is additionally arranged outside the oil cylinder, vibration under the working condition of high-speed movement or extreme pressure can be reduced, and the oil cylinder is prevented from being damaged or deformed; the multi-pump system transmits hydraulic oil of a hydraulic oil tank to the lifting module through an oil supply pipeline, the lifting module conducts overflow pressure stabilization on the hydraulic oil and then transmits the hydraulic oil to the station oil cylinder, and therefore the station oil cylinder stretches out and draws back to adjust the position of the oil press. The multi-pump system transmits hydraulic oil of a hydraulic oil tank to an energy accumulator for pressurization through a pressurization pipeline, pressure regulation is conducted through a pressure regulation one-way throttle valve, then pressure stabilization is conducted through a pressure regulation piezoelectric hydraulic reversing valve and a pressure regulation hydraulic control one-way valve, and finally the hydraulic oil flows into a light-pressure station oil cylinder or a heavy-pressure station oil cylinder through the pressurization pipeline. Therefore, the hydraulic pressure output of the oil press is improved, the same oil press can process various different work tasks, and the universality and adaptability of equipment are improved.

Description

Technical Field

[0001] The present invention relates to the field of hydraulic technology, and in particular to an oil cylinder for an oil press, a hydraulic system and a pressurizing method thereof. Background Art

[0002] Hydraulic press is a kind of machine that uses special hydraulic oil as working medium and hydraulic pump as power source. With the help of the force of the pump, the hydraulic oil enters the cylinder / piston through the hydraulic pipeline, and circulates the hydraulic oil in the oil tank through the one-way valve to make the cylinder / piston circulate and work, thereby completing certain mechanical actions as a kind of productivity. Hydraulic press is widely used in the processing of spare parts in the automotive industry, shaping, punching and correction of various products in various industries, pressing and stamping of shoemaking, handbags, rubber, molds, shafts, sleeves and other parts, as well as bending, stamping, sleeve stretching and other processing technologies of sheet parts.

[0003] In hydraulic presses, booster cylinders are usually used in process that require high pressure and rapid prototyping. For example, in operations that require large torque, such as metal stamping and mold forming, booster cylinders achieve high pressure output through smaller hydraulic pressure, thereby ensuring the forming accuracy and efficiency of the workpiece.

[0004] There are many types of hydraulic presses, and they vary greatly in size, structure, and efficiency depending on production needs. Among them, the frame gantry hydraulic press is a commonly used hydraulic equipment, which mainly includes an upper beam, a slider, a column, a lower beam, and a main cylinder. The main cylinder is set on the top of the upper beam. The piston rod of the main cylinder presses down to drive the slider to drop quickly, and the slider is then slowly pressurized to maintain pressure and form, and then the slider is driven to rise quickly through the main cylinder. During the working process of the hydraulic press, its pressure control is very important. The accuracy of pressure control directly affects the processing quality of the product.

[0005] At present, the oil temperature of most hydraulic press systems rises too quickly when working, the energy utilization efficiency is low. According to statistics, the effective energy utilization efficiency is only 7%, and the pressure of the oil supply hydraulic system is single and unchangeable. The entire system lacks the necessary vibration reduction and energy storage devices.

[0006] The hydraulic press using traditional servo motors has a hysteresis characteristic in the hydraulic system, which leads to delayed pressure buildup during the transition from fast forward to fast forward, resulting in impact vibration and jamming, which greatly affects the stamping quality of the machine. At the same time, since the slides of hydraulic presses and hydraulic presses are of large mass, the traditional hydraulic system does not have any energy-saving devices during the slide drop process, resulting in large energy loss. At the same time, in the traditional hydraulic system, in order to further pursue work efficiency, the motor installed power can only be continuously increased, resulting in a huge waste of resources and energy. Summary of the invention

[0007] In order to solve the above-mentioned prior art problems, the present invention provides an oil cylinder for an oil press;

[0008] Another object of the present invention is to provide a hydraulic system for an oil press;

[0009] Another object of the present invention is to provide an energy storage and pressurization method for an oil hydraulic press.

[0010] An oil cylinder for an oil press comprises a piston arranged in a cylinder body, a piston rod is located inside the oil cylinder, the piston rod divides the inner cavity of the oil cylinder into a rod cavity and a rodless cavity, and the two cavities respectively contain hydraulic oil to drive the piston to move;

[0011] A protection frame is provided outside the oil cylinder, and a channel interface for connecting the rod cavity and the rodless cavity of the oil cylinder is provided on the protection frame;

[0012] The channel interface of the oil cylinder is connected to the oil press through a working oil circuit, thereby driving the oil press to work.

[0013] Furthermore, a hydraulically controlled reversing valve is also provided on the working oil circuit, and a plurality of feedback grooves for detecting the movement position of the piston are provided on the piston rod, and are connected to the hydraulically controlled reversing valve through a feedback fluid circuit;

[0014] The hydraulically controlled reversing valve is arranged on the feedback oil circuit and the working oil circuit on the feedback groove, and the hydraulically controlled reversing valve can realize the switching between the oil inlet channel P port and the oil return channel T port according to the feedback signal.

[0015] Preferably, the channel interface on the protection frame is provided with threads, through which the oil inlet and outlet pipelines of the hydraulic press can be detachably connected.

[0016] A hydraulic system for an oil press, comprising a lifting module, a light pressure module, a heavy pressure module, a multi-pump system, a pressure regulating module and a hydraulic oil tank;

[0017] The hydraulic oil tank is connected to the workstation oil cylinder, the light pressure workstation oil cylinder and the heavy pressure workstation oil cylinder through the oil supply pipeline and the oil return pipeline, and the hydraulic oil tank is also connected to the light pressure workstation oil and the heavy pressure workstation oil cylinder through the pressurized pipeline;

[0018] The multi-pump system transmits the hydraulic oil in the hydraulic oil tank to the lifting position cylinder, the light pressure position cylinder and the heavy pressure position cylinder respectively through the lifting module and the multi-pump system;

[0019] The multi-pump system also pressurizes the hydraulic oil in the hydraulic oil tank through the pressure regulating module and can selectively transmit it to the light pressure station cylinder and / or the heavy pressure station cylinder;

[0020] The pressure regulating module is also provided with a pressure regulating electro-hydraulic reversing valve, a pressure regulating hydraulically controlled one-way valve, a pressure regulating one-way throttle valve, an accumulator and a pressure regulating overflow valve on the pressurized pipeline.

[0021] Further, the lifting module includes a first electro-hydraulic reversing valve, a first hydraulically controlled one-way valve and a first one-way throttle valve;

[0022] The oil supply pipeline of the station oil cylinder is connected to the hydraulic oil tank through the first electro-hydraulic reversing valve, the first hydraulically controlled one-way valve and the first one-way throttle valve;

[0023] The oil return pipeline of the workstation oil cylinder is connected to the hydraulic oil tank through the first electro-hydraulic reversing valve, the first hydraulically controlled one-way valve and the first one-way throttle valve.

[0024] Further, the light pressure module includes a second electromagnetic reversing valve, a second hydraulically controlled one-way valve and a second one-way throttle valve;

[0025] The oil supply pipeline of the light pressure station oil cylinder is connected to the hydraulic oil tank through the second electromagnetic reversing valve, the second hydraulically controlled one-way valve and the second one-way throttle valve;

[0026] The oil return pipeline of the light pressure station oil cylinder is connected to the hydraulic oil tank through a low-pressure relief valve, a second electromagnetic reversing valve, a second hydraulically controlled one-way valve, and a second one-way throttle valve.

[0027] Further, the heavy pressure module includes a third electromagnetic reversing valve, a third hydraulically controlled one-way valve and a third one-way throttle valve;

[0028] The oil supply pipeline of the heavy pressure station oil cylinder is connected to the hydraulic oil tank through the third electromagnetic reversing valve, the third hydraulically controlled one-way valve and the third one-way throttle valve;

[0029] The oil return pipeline of the heavy pressure station oil cylinder is connected to the hydraulic oil tank through a high-pressure relief valve, a third electromagnetic reversing valve, a third hydraulically controlled one-way valve and a third one-way throttle valve.

[0030] Furthermore, the pressure regulating module also includes an accumulator and a pressure regulating relief valve;

[0031] Another hydraulic pump of the multiple pump system is connected to the pressurized pipeline;

[0032] The accumulator is arranged between the hydraulic oil tank and the pressurized pipeline, and is used to increase the pressure of the pressurized pipeline;

[0033] The pressure regulating relief valve connects the hydraulic oil tank with the pressurized pipeline and is used to regulate the pressure of the pressurized pipeline.

[0034] Furthermore, the oil supply pipeline connected to the multi-pump system is also connected back to the hydraulic oil tank through an oil supply overflow valve to adjust the pressure of the oil supply pipeline;

[0035] The multi-pump system includes a plurality of hydraulic pumps and a driving motor; the oil supply pipeline is provided with a plurality of hydraulic pumps, and the driving motor is connected to the hydraulic pump;

[0036] An air filter and a liquid level gauge are also arranged in the hydraulic oil tank.

[0037] Preferably, the inlet of the electromagnetic overflow valve is connected to the oil supply pipeline, and the high-pressure outlet thereof is connected to the oil return pipeline.

[0038] Furthermore, an oil suction filter is provided between the oil supply pipeline and the hydraulic oil tank, and an oil return filter is provided between the oil return pipeline and the hydraulic oil tank.

[0039] An energy storage and pressurization method for a hydraulic system of an oil hydraulic press, the energy storage and pressurization method for the hydraulic system comprising the following steps:

[0040] S1: Start a part of the pumps in the multi-pump system to increase the hydraulic pressure of the oil supply pipeline, and pressurize the hydraulic oil in the hydraulic oil tank to flow into the oil supply pipeline;

[0041] S2: When the hydraulic press needs to be adjusted to a suitable position, the lifting module transports the hydraulic oil in the hydraulic oil tank to the station cylinder, and the station cylinder drives the hydraulic press to move to a suitable processing station through a movable rod;

[0042] S3: When the hydraulic press is required to perform light pressing, the light pressing module transports the hydraulic oil in the hydraulic oil tank to the light pressing station oil cylinder, and the light pressing station oil cylinder of the hydraulic press performs stamping processing on the processing object;

[0043] S4: When the hydraulic press is required to perform heavy pressing work, the heavy pressing module transports the hydraulic oil in the hydraulic oil tank to the heavy pressing station cylinder, and the heavy pressing station cylinder of the hydraulic press performs stamping processing on the processing object;

[0044] S5: When the punching force of the hydraulic press needs to be adjusted, start the other part of the multi-pump system, let the hydraulic oil in the hydraulic oil tank flow into the pressurized pipeline, and adjust the flow rate of the hydraulic oil into the pressurized pipeline through the pressure regulating overflow valve.

[0045] Then, the accumulator is opened to pressurize the hydraulic oil in the hydraulic oil tank and flow it into the pressurized pipeline to form high-pressure hydraulic oil. Then, the pressure-regulating electro-hydraulic reversing valve, the pressure-regulating one-way throttle valve of the pressure-regulating hydraulic control one-way valve jointly adjust the high-pressure hydraulic oil in the pressurized pipeline to reach a suitable pressure, thereby adjusting the punching force of the hydraulic press.

[0046] S6: When it is necessary to adjust the light pressure position cylinder or heavy pressure position cylinder of the hydraulic press to work, another part of the pump and / or accumulator of the multi-pump system can be started to make the hydraulic press work with light pressure or heavy pressure.

[0047] Preferably, when it is necessary to add high-pressure hydraulic oil to the rodless chamber of the working cylinder of the hydraulic press, the coil of the pressure regulating electro-hydraulic reversing valve is energized, and the pressure oil enters the pressure regulating hydraulic control check valve and the pressure regulating check throttle valve through the pressure regulating electro-hydraulic reversing valve, and then enters the rodless chamber of the working cylinder; the hydraulic oil in the rod chamber of the working cylinder enters the return oil pipeline, and the hydraulic oil in the return oil pipeline flows back to the hydraulic oil tank through the pressure regulating electro-hydraulic reversing valve and / or the electro-hydraulic reversing valve of the return oil pipeline.

[0048] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0049] ① Adding a protective frame to the outside of the oil cylinder can reduce vibration under high-speed movement or extreme pressure conditions, and avoid damage or deformation of the oil cylinder; the rod chamber and the rodless chamber are connected through the channel interface on the protective frame, making the oil circuit layout more centralized and clear, and facilitating the connection with the working oil circuit of the hydraulic press; during equipment maintenance, the centrally managed channel interface can more conveniently carry out the inspection, cleaning or replacement of the hydraulic system, thereby improving the maintenance efficiency of the equipment.

[0050] ② Connect the hydraulic oil tank to the workstation cylinder through the lifting module to adjust the position of the hydraulic press;

[0051] The multi-pump system transfers the hydraulic oil from the hydraulic oil tank to the lifting module through the oil supply pipeline. The lifting module transfers the hydraulic oil to the work cylinder after overflow and pressure stabilization, so that the work cylinder can be extended and retracted to adjust the position of the hydraulic press. Through the lifting module, the position of the hydraulic press relative to the workpiece or workstation can be easily adjusted to meet the work requirements of different heights or angles. This enables the machine to handle more types of tasks and improves the versatility and applicability of the equipment.

[0052] ③ Connect the hydraulic oil tank to the light pressure station oil cylinder or the heavy pressure station oil cylinder through the light pressure module or the heavy pressure module to drive the hydraulic press to perform compression work;

[0053] The multi-pump system transmits the hydraulic oil in the hydraulic oil tank to the light pressure module or the heavy pressure module through the oil supply pipeline, and selects the light pressure module or the heavy pressure module to pressurize and overflow the hydraulic oil and then transmit it to the light pressure station cylinder or the heavy pressure station cylinder, thereby driving the light pressure station cylinder or the heavy pressure station cylinder of the hydraulic press to extend and retract to output hydraulic pressure; the light pressure module and the heavy pressure module can provide different levels of hydraulic pressure output, so that the hydraulic press can flexibly adjust the force it generates according to actual needs; by using different pressure modules, the system can easily cope with a variety of application scenarios without changing the hardware structure; this improves the versatility of the equipment and makes it more suitable for complex and changing production environments.

[0054] ④ Connect the hydraulic oil tank to the light pressure station oil cylinder or the heavy pressure station oil cylinder through the pressure regulating module to increase the high-pressure hydraulic oil for the light pressure station oil cylinder or the heavy pressure station oil cylinder;

[0055] The multi-pump system transmits the hydraulic oil in the hydraulic oil tank to the accumulator through the pressurized pipeline for pressurization, and regulates the pressure through the pressure-regulating one-way throttle valve, and then stabilizes the pressure through the pressure-regulating electro-hydraulic reversing valve and the pressure-regulating hydraulic-controlled one-way valve, and finally flows into the light pressure station cylinder or the heavy pressure station cylinder through the pressurized pipeline, thereby increasing the hydraulic pressure output of the hydraulic press; the pressure regulating module can adjust the output pressure value as needed to ensure that the light pressure station cylinder and the heavy pressure station cylinder obtain the required pressure level; through the pressure regulating module, the system can flexibly switch between light pressure mode and heavy pressure mode; this enables the same hydraulic press to handle a variety of different work tasks, improving the versatility and adaptability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the implementation mode will be briefly introduced below. Obviously, the drawings described below are only some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0057] Figure 1 It is a schematic diagram of a hydraulic system for an oil press;

[0058] Figure 2 It is a schematic diagram of the coordination between the station cylinder and the lifting module;

[0059] Figure 3 This is a schematic diagram of the coordination between the light pressure station oil cylinder and the light pressure module;

[0060] Figure 4 It is a schematic diagram of the coordination between the heavy pressure station cylinder and the heavy pressure module;

[0061] Figure 5 is a schematic diagram of the hydraulic oil tank;

[0062] Figure 6 It is a schematic diagram of the oil cylinder.

[0063] The reference numerals are as follows:

[0064] 1. Lifting module; 101. First electro-hydraulic reversing valve; 102. First hydraulically controlled one-way valve; 103. First one-way throttle valve;

[0065] 2. Light pressure module; 201. Second electromagnetic reversing valve; 202. Second hydraulically controlled one-way valve; 203. Second one-way throttle valve; 204. Low-pressure relief valve;

[0066] 3. Heavy pressure module; 301. Third electromagnetic reversing valve; 302. Third hydraulically controlled one-way valve; 303. Third one-way throttle valve; 304. High-pressure relief valve;

[0067] 4. Multiple pump system; 401. Hydraulic pump; 402. Driving motor;

[0068] 5. Pressure regulating module; 501. Pressure regulating electro-hydraulic reversing valve; 502. Pressure regulating hydraulically controlled one-way valve; 503. Pressure regulating one-way throttle valve; 504. Accumulator; 505. Pressure regulating relief valve;

[0069] 6. Hydraulic oil tank;

[0070] 7. Workstation oil cylinder;

[0071] 8. Light pressure station oil cylinder;

[0072] 9. Heavy pressure station oil cylinder;

[0073] 10. Oil supply pipeline;

[0074] 11. Oil return pipeline;

[0075] 12. Oil supply overflow valve;

[0076] 13. Air filter;

[0077] 14. Liquid level gauge;

[0078] 15. Oil suction filter;

[0079] 16. Oil return filter;

[0080] 17. Pressurized pipeline. DETAILED DESCRIPTION

[0081] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the present application will be clearly and completely described below in conjunction with the drawings of the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the described embodiments, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0082] Unless otherwise defined, the technical terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. "First", "second" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0083] Example 1

[0084] like Figure 6 As shown, this embodiment discloses an oil cylinder for an oil hydraulic press, comprising a piston arranged in a cylinder body, a piston rod located inside the oil cylinder, and the piston rod divides the inner cavity of the oil cylinder into a rod cavity and a rodless cavity, and the two cavities respectively contain hydraulic oil to drive the piston to move;

[0085] A protection frame is provided outside the oil cylinder, and a channel interface for connecting the rod chamber and the rodless chamber of the oil cylinder is provided on the protection frame;

[0086] The channel interface of the oil cylinder is connected to the oil press through the working oil circuit, thereby driving the oil press to work.

[0087] Specifically, adding a protective frame to the outside of the oil cylinder can reduce vibration under high-speed movement or extreme pressure conditions, and avoid damage or deformation of the oil cylinder; the rod chamber and the rodless chamber are connected through the channel interface on the protective frame, making the oil circuit layout more centralized and clear, and facilitating connection with the working oil circuit of the hydraulic press; during equipment maintenance, the centrally managed channel interface can make it more convenient to inspect, clean or replace the hydraulic system, thereby improving the maintenance efficiency of the equipment.

[0088] As a specific implementation method, a hydraulically controlled reversing valve is also provided on the working oil circuit, and a plurality of feedback grooves for detecting the movement position of the piston are provided on the piston rod, and are connected to the hydraulically controlled reversing valve through a feedback fluid circuit;

[0089] The hydraulically controlled reversing valve is arranged on the feedback oil circuit and the working oil circuit on the feedback groove. The hydraulically controlled reversing valve can realize the switching between the oil inlet channel P port and the oil return channel T port according to the feedback signal.

[0090] Specifically, the multiple feedback grooves arranged on the piston rod are used to detect the moving position of the piston in the cylinder. These grooves can capture the different positions of the piston and transmit the signal to the hydraulically controlled reversing valve through the feedback fluid circuit; the hydraulically controlled reversing valve determines the flow direction of the hydraulic oil according to the feedback signal; when the piston reaches a predetermined position, the feedback groove will trigger the action of the hydraulically controlled reversing valve, causing it to switch the oil inlet channel P port and the oil return channel T port.

[0091] like Figure 1-5 As shown, this embodiment discloses a hydraulic system for an oil press, comprising a lifting module 1, a light pressure module 2, a heavy pressure module 3, a multi-pump system 4, a pressure regulating module 5 and a hydraulic oil tank 6;

[0092] The hydraulic oil tank 6 is connected to the workstation oil cylinder 7, the light pressure workstation oil cylinder 8 and the heavy pressure workstation oil cylinder 9 through the oil supply pipeline 10 and the return oil pipeline 11. The hydraulic oil tank 6 is also connected to the light pressure workstation oil cylinder 8 and the heavy pressure workstation oil cylinder 9 through the pressurized pipeline 17.

[0093] The multi-pump system 4 transmits the hydraulic oil in the hydraulic oil tank 6 to the lifting position cylinder 7, the light pressure position cylinder 8 and the heavy pressure position cylinder 9 respectively through the lifting module 1 and the multi-pump system 4;

[0094] The multi-pump system 4 also pressurizes the hydraulic oil in the hydraulic oil tank 6 through the pressure regulating module 5 and can selectively transmit it to the light pressure station cylinder 8 and / or the heavy pressure station cylinder 9;

[0095] The pressure regulating module 5 is also provided with a pressure regulating electro-hydraulic reversing valve 501 , a pressure regulating hydraulically controlled one-way valve 502 , a pressure regulating one-way throttle valve 503 , an accumulator 504 and a pressure regulating relief valve 505 on the pressurized pipeline 17 .

[0096] As a specific implementation, the lifting module 1 includes a first electro-hydraulic reversing valve 101, a first hydraulically controlled one-way valve 102 and a first one-way throttle valve 103;

[0097] The oil supply pipeline 10 of the station oil cylinder 7 is connected to the hydraulic oil tank 6 through the first electro-hydraulic reversing valve 101, the first hydraulically controlled one-way valve 102 and the first one-way throttle valve 103;

[0098] The oil return pipeline 11 of the workstation oil cylinder 7 is connected to the hydraulic oil tank 6 through the first electro-hydraulic reversing valve 101 , the first hydraulically controlled one-way valve 102 and the first one-way throttle valve 103 .

[0099] Specifically, the multi-pump system 4 transmits the hydraulic oil of the hydraulic oil tank 6 to the lifting module 1 through the oil supply pipeline 10, and the lifting module 1 transmits the hydraulic oil to the workstation cylinder 7 after overflow and pressure stabilization, so that the workstation cylinder 7 can be extended and retracted to adjust the position of the hydraulic press; through the lifting module 1, the position of the hydraulic press relative to the workpiece or workstation can be easily adjusted to adapt to work requirements at different heights or angles, which enables the machine to handle a wider variety of tasks and improves the versatility and applicability of the equipment.

[0100] When the position of the hydraulic press needs to be adjusted, the hydraulic oil tank 6 is connected to the workstation cylinder 7 through the lifting module 1;

[0101] The multi-pump system 4 is turned on, and the driving motor 402 drives the hydraulic pump 401 to rotate. The atmospheric pressure delivers the oil to the hydraulic pump 401 through the oil suction filter 15; the hydraulic pump 401 adjusts the pressure output through the oil supply overflow valve 12 and transmits it to the oil supply pipeline 10; the coil YV4 of the first electro-hydraulic reversing valve 101 is energized, and the pressure oil enters the rodless chamber of the oil cylinder through the first hydraulically controlled one-way valve 102 and the first one-way throttle valve 103;

[0102] The oil in the rod chamber of the oil cylinder flows back to the oil return pipeline 11 through the first hydraulically controlled one-way valve 102, the first one-way throttle valve 103 and the first electro-hydraulic reversing valve 101, and flows back to the hydraulic oil tank 6, and the lifting position oil cylinder 7 is slowly extended.

[0103] As a specific implementation, the light pressure module 2 includes a second electromagnetic reversing valve 201, a second hydraulically controlled one-way valve 202 and a second one-way throttle valve 203;

[0104] The oil supply pipeline 10 of the light pressure station oil cylinder 8 is connected to the hydraulic oil tank 6 through the second electromagnetic reversing valve 201, the second hydraulically controlled one-way valve 202 and the second one-way throttle valve 203;

[0105] The oil return pipeline 11 of the light pressure station oil cylinder 8 is connected to the hydraulic oil tank 6 through the low-pressure relief valve 204, the second electromagnetic reversing valve 201, the second hydraulically controlled one-way valve 202, and the second one-way throttle valve 203.

[0106] Specifically, when it is necessary to drive the light pressure station oil cylinder 8 of the hydraulic press, the hydraulic oil tank 6 is connected to the light pressure station oil cylinder 8 through the light pressure module 2;

[0107] The multi-pump system 4 is turned on, and the driving motor 402 drives the hydraulic pump 401 to rotate. The atmospheric pressure delivers the oil to the hydraulic pump 401 through the oil suction filter 15; the hydraulic pump 401 adjusts the pressure output through the oil supply overflow valve 12 and transmits it to the oil supply pipeline 10; the coil YV4 of the second electromagnetic reversing valve 201 is energized, and the pressure oil passes through the second hydraulically controlled one-way valve 202 and the second one-way throttle valve 203 and enters the rodless chamber of the light pressure station oil cylinder 8;

[0108] The hydraulic oil in the rod chamber of the light pressure station cylinder 8 flows back to the return oil pipeline 11 through the second hydraulically controlled one-way valve 202, the second one-way throttle valve 203 and the second electromagnetic reversing valve 201, and flows back to the hydraulic oil tank 6, thereby lifting the light pressure station cylinder 8 to extend.

[0109] As a specific implementation, the heavy pressure module 3 includes a third electromagnetic reversing valve 301, a third hydraulically controlled one-way valve 302 and a third one-way throttle valve 303;

[0110] The oil supply pipeline 10 of the heavy pressure station oil cylinder 9 is connected to the hydraulic oil tank 6 through the third electromagnetic reversing valve 301, the third hydraulically controlled one-way valve 302 and the third one-way throttle valve 303;

[0111] The oil return pipeline 11 of the heavy pressure station oil cylinder 9 is connected to the hydraulic oil tank 6 through the high-pressure relief valve 304, the third electromagnetic reversing valve 301, the third hydraulically controlled one-way valve 302 and the third one-way throttle valve 303.

[0112] Specifically, when it is necessary to drive the heavy pressure station oil cylinder 9 of the hydraulic press, the hydraulic oil tank 6 is connected to the heavy pressure station oil cylinder 9 through the heavy pressure module 3;

[0113] The multi-pump system 4 is turned on, and the driving motor 402 drives the hydraulic pump 401 to rotate. The atmospheric pressure delivers the oil to the hydraulic pump 401 through the oil suction filter 15; the hydraulic pump 401 adjusts the pressure output through the oil supply overflow valve 12 and transmits it to the oil supply pipeline 10; the coil of the third electromagnetic reversing valve 301 is energized, and the pressure oil passes through the third hydraulically controlled one-way valve 302 and the third one-way throttle valve 303 and enters the rodless chamber of the heavy pressure station oil cylinder 9;

[0114] The hydraulic oil in the rod chamber of the heavy-pressing station oil cylinder 9 flows back to the return oil pipeline 11 through the third hydraulically controlled one-way valve 302, the third one-way throttle valve 303 and the third electromagnetic reversing valve 301, and flows back to the hydraulic oil tank 6, thereby lifting the heavy-pressing station oil cylinder 9 to extend.

[0115] As a specific implementation, the pressure regulating module 5 further includes an accumulator 504 and a pressure regulating relief valve 505;

[0116] Another hydraulic pump of the multiple pump system 4 is connected to the pressurized pipeline 17;

[0117] The accumulator 504 is disposed between the hydraulic oil tank 6 and the pressurized pipeline 17 and is used to increase the pressure of the pressurized pipeline 17;

[0118] The pressure regulating relief valve 505 connects the hydraulic oil tank 6 with the pressurized pipeline 17 to adjust the pressure of the pressurized pipeline 17 .

[0119] Specifically, the multi-pump system 4 is turned on, the driving motor 402 drives the hydraulic pump 401 to rotate, and the atmospheric pressure transmits the oil to the pressurized pipeline 17 through the hydraulic pump 401; the pressurized pipeline 17 will adjust the pressure output through the pressure regulating relief valve 505, and the pressure oil will be pressurized through the pressure regulating relief valve 505, and the size of the pressurization will be fed back through the electric contact pressure gauge;

[0120] When the pressure is less than 25Mpa, the pressure oil will pressurize the accumulator 504; when the pressure regulating relief valve 505 is energized, the pressure oil in the accumulator 504 passes through the P to A port of the pressure regulating relief valve 505, and passes through the pressure regulating electro-hydraulic reversing valve 501, the pressure regulating hydraulically controlled one-way valve 502 and the pressure regulating one-way throttle valve 503 in sequence, and enters the rodless chamber of the light pressure position cylinder 8 or the heavy pressure position cylinder 9 to achieve pressurization.

[0121] Specifically, the multi-pump system 4 transmits the hydraulic oil of the hydraulic oil tank 6 to the light pressure module 2 or the heavy pressure module 3 through the oil supply pipeline 10, and selects the light pressure module 2 or the heavy pressure module 3 to pressurize and overflow the hydraulic oil and then transmit it to the light pressure station cylinder 8 or the heavy pressure station cylinder 9, thereby driving the light pressure station cylinder 8 or the heavy pressure station cylinder 9 of the hydraulic press to extend and retract to output hydraulic pressure; the light pressure module 2 and the heavy pressure module 3 can provide different levels of hydraulic pressure output, so that the hydraulic press can flexibly adjust the force it generates according to actual needs; by using different pressure modules, the system can easily cope with a variety of application scenarios without changing the hardware structure, effectively improving the versatility of the equipment, making it more suitable for complex and changeable production environments.

[0122] Example 2

[0123] like Figure 1-5 As shown, as a specific implementation, the oil supply pipeline 10 connected to the multi-pump system 4 is also connected back to the hydraulic oil tank 6 through an oil supply overflow valve 12 for adjusting the pressure of the oil supply pipeline 10;

[0124] The multiple pump system 4 includes a plurality of hydraulic pumps 401 and a drive motor 402; a plurality of hydraulic pumps 401 are provided on the oil supply pipeline 10, and the drive motor 402 is connected to the hydraulic pump 401;

[0125] An air filter 13 and a liquid level gauge 14 are also provided in the hydraulic oil tank 6 .

[0126] Specifically, when the pressure in the oil supply line 10 exceeds the set value, it automatically opens and allows part of the hydraulic oil to flow back to the hydraulic oil tank 6, thereby ensuring that the pressure in the oil supply line 10 is maintained within a safe and stable range, which can prevent the system from being damaged due to excessive pressure and extend the service life of the hydraulic pump, pipelines and other components;

[0127] When the system does not require high pressure, the oil supply relief valve 12 can return excess hydraulic oil to the hydraulic oil tank 6 instead of allowing it to circulate in the system, which helps to reduce energy waste;

[0128] The multi-pump system 4 consisting of multiple hydraulic pumps 401 and drive motors 402 can provide higher flow and pressure, and also increase the redundancy of the system; when a pump fails, the other pumps can continue to work to ensure the continuous operation of the system.

[0129] Specifically, the air filter 13 can be used to filter the air entering the hydraulic oil tank 6, prevent dust and impurities from entering the oil, maintain the cleanliness of the oil, and thus improve the reliability and life of the system; the level meter 14 can be used to monitor the oil level in the hydraulic oil tank 6 to ensure that the oil level in the tank is within a normal range. When the oil level is too low, the hydraulic oil can be replenished in time to avoid malfunctions caused by lack of oil in the system.

[0130] As a specific implementation manner, an oil suction filter 15 is further provided between the oil supply pipeline 10 and the hydraulic oil tank 6 , and an oil return filter 16 is further provided between the oil return pipeline 11 and the hydraulic oil tank 6 .

[0131] Specifically, the oil suction filter 15 is installed at the oil inlet of the hydraulic pump, which can effectively filter out impurities (such as metal particles, dust, etc.) in the hydraulic oil, prevent these impurities from entering the interior of the hydraulic pump, and significantly reduce the wear of the internal components of the hydraulic pump, thereby extending the service life of the pump. ;

[0132] During the operation of the hydraulic system, new impurities may be generated due to wear, corrosion and other reasons; the return oil filter 16 can capture these newly generated impurities to ensure that the oil returned to the tank is clean, thereby performing secondary filtration on the oil, further improving the cleanliness of the oil and preparing it for the next cycle.

[0133] Example 3

[0134] like Figure 1-5 As shown, this embodiment discloses an energy storage and pressurization method for a hydraulic press, and the energy storage and pressurization method for a hydraulic system includes the following:

[0135] S1: starting a part of the pumps of the multi-pump system 4 to increase the hydraulic pressure of the oil supply pipeline 10, and pressurizing the hydraulic oil in the hydraulic oil tank 6 to flow into the oil supply pipeline 10;

[0136] S2: When the hydraulic press needs to be adjusted to a suitable position, the lifting module 1 transports the hydraulic oil in the hydraulic oil tank 6 to the station cylinder 7, and the station cylinder 7 drives the hydraulic press to move to a suitable processing station through a movable rod;

[0137] S3: When the hydraulic press is required to perform light pressing, the light pressing module 2 transports the hydraulic oil in the hydraulic oil tank 6 to the light pressing station oil cylinder 8, and the light pressing station oil cylinder 8 of the hydraulic press performs stamping processing on the processed object;

[0138] S4: When the hydraulic press is required to perform heavy pressing work, the heavy pressing module 3 transports the hydraulic oil in the hydraulic oil tank 6 to the heavy pressing station cylinder 9, and the heavy pressing station cylinder 9 of the hydraulic press performs stamping processing on the processing object;

[0139] S5: When the punching force of the hydraulic press needs to be adjusted, another part of the pump of the multi-pump system 4 is started, and the hydraulic oil in the hydraulic oil tank 6 flows into the pressurized pipeline 17. The flow rate of the hydraulic oil flowing into the pressurized pipeline 17 is adjusted by the pressure regulating overflow valve 505.

[0140] Then, the accumulator 504 is opened to pressurize the hydraulic oil in the hydraulic oil tank 6 and flow it into the pressurizing pipeline 17 to form high-pressure hydraulic oil. Then, the pressure-regulating electro-hydraulic reversing valve 501, the pressure-regulating one-way throttle valve 503 of the pressure-regulating hydraulic control one-way valve 502 jointly regulate the high-pressure hydraulic oil in the pressurizing pipeline 17 to reach a suitable pressure, thereby adjusting the punching force of the hydraulic press.

[0141] S6: When it is necessary to adjust the light pressure position cylinder 8 or the heavy pressure position cylinder 9 of the hydraulic press to work, another part of the pumps of the multi-pump system 4 and / or the accumulator 504 can be started to make the hydraulic press work with light pressure or heavy pressure.

[0142] Specifically, the system achieves efficient, precise and flexible hydraulic control through the coordination of a multi-pump, an accumulator 504 and a plurality of pressure regulating elements; its modular design not only improves the response speed and energy utilization of the system, but also ensures the reliability of the system and the consistency of processing quality; the solution is suitable for production scenarios that require multi-level pressure control and flexible workstation switching, such as precision processing in the automotive, electronics and other industries.

[0143] How it works

[0144] When the position of the hydraulic press needs to be adjusted, the multi-pump system 4 transmits the hydraulic oil in the hydraulic oil tank 6 to the lifting module 1 through the oil supply pipeline 10, and the lifting module 1 transmits the hydraulic oil to the workstation cylinder 7 after overflow and pressure stabilization, so that the workstation cylinder 7 can be extended and retracted to adjust the position of the hydraulic press; through the lifting module 1, the position of the hydraulic press relative to the workpiece or workstation can be easily adjusted to meet the work requirements at different heights or angles, which enables the machine to handle more types of tasks and improves the versatility and applicability of the equipment;

[0145] When it is necessary to drive the light pressure station oil cylinder 8 and the heavy pressure station oil cylinder 9 of the hydraulic press, the multi-pump system 4 transmits the hydraulic oil of the hydraulic oil tank 6 to the lifting module 1 through the oil supply pipeline 10, and the lifting module 1 transmits the hydraulic oil to the station oil cylinder 7 after overflow and pressure stabilization, so that the station oil cylinder 7 can be extended and retracted to adjust the position of the hydraulic press; through the lifting module 1, the position of the hydraulic press relative to the workpiece or workstation can be easily adjusted to meet the working requirements of different heights or angles, which enables the machine to handle more types of tasks and improves the versatility and applicability of the equipment;

[0146] When the pressure is less than 25Mpa, the pressure oil will pressurize the accumulator 504; when the pressure regulating relief valve 505 is energized, the pressure oil in the accumulator 504 passes through the P to A port of the pressure regulating relief valve 505, and passes through the pressure regulating electro-hydraulic reversing valve 501, the pressure regulating hydraulically controlled one-way valve 502 and the pressure regulating one-way throttle valve 503 in sequence, and enters the rodless chamber of the light pressure position cylinder 8 or the heavy pressure position cylinder 9 to achieve pressurization.

[0147] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A cylinder for a hydraulic press, characterized in that: It includes a piston arranged in a cylinder body, a piston rod located inside the oil cylinder, the piston rod divides the inner cavity of the oil cylinder into a rod cavity and a rodless cavity, and the two cavities respectively contain hydraulic oil to drive the piston to move; A protection frame is provided outside the oil cylinder, and a channel interface for connecting the rod cavity and the rodless cavity of the oil cylinder is provided on the protection frame; The channel interface of the oil cylinder is connected to the oil press through a working oil circuit, thereby driving the oil press to work.

2. The oil cylinder for an oil press according to claim 1, characterized in that: The working oil circuit is also provided with a hydraulically controlled reversing valve, and the piston rod is provided with a plurality of feedback grooves for detecting the movement position of the piston, and is connected to the hydraulically controlled reversing valve through a feedback fluid circuit; The hydraulically controlled reversing valve is arranged on the feedback oil circuit and the working oil circuit on the feedback groove, and the hydraulically controlled reversing valve can realize the switching between the oil inlet channel P port and the oil return channel T port according to the feedback signal.

3. A hydraulic system for an oil press, characterized in that: It comprises a lifting module (1), a light pressure module (2), a heavy pressure module (3), a multi-pump system (4), a pressure regulating module (5) and a hydraulic oil tank (6); The hydraulic oil tank (6) is connected to the workstation oil cylinder (7), the light pressure workstation oil cylinder (8) and the heavy pressure workstation oil cylinder (9) through an oil supply pipeline (10) and an oil return pipeline (11); the hydraulic oil tank (6) is also connected to the light pressure workstation oil cylinder (8) and the heavy pressure workstation oil cylinder (9) through a pressurizing pipeline (17); The multi-pump system (4) transmits the hydraulic oil in the hydraulic oil tank (6) to the lifting position cylinder (7), the light pressure position cylinder (8) and the heavy pressure position cylinder (9) respectively through the lifting module (1) and the multi-pump system (4); The multi-pump system (4) also pressurizes the hydraulic oil in the hydraulic oil tank (6) through the pressure regulating module (5) and can selectively transmit the pressurized hydraulic oil to the light pressure station cylinder (8) and / or the heavy pressure station cylinder (9); The pressure regulating module (5) is also provided with a pressure regulating electro-hydraulic reversing valve (501), a pressure regulating hydraulically controlled one-way valve (502), a pressure regulating one-way throttle valve (503), an accumulator (504) and a pressure regulating overflow valve (505) on the pressurized pipeline (17).

4. The hydraulic system for an oil press according to claim 3, characterized in that: The lifting module (1) comprises a first electro-hydraulic reversing valve (101), a first hydraulically controlled one-way valve (102) and a first one-way throttle valve (103); The oil supply pipeline (10) of the workstation oil cylinder (7) is connected to the hydraulic oil tank (6) via a first electro-hydraulic reversing valve (101), a first hydraulically controlled one-way valve (102) and a first one-way throttle valve (103); The oil return pipeline (11) of the workstation oil cylinder (7) is connected to the hydraulic oil tank (6) via a first electro-hydraulic reversing valve (101), a first hydraulically controlled one-way valve (102) and a first one-way throttle valve (103).

5. The hydraulic system for an oil press according to claim 3, characterized in that: The light pressure module (2) comprises a second electromagnetic reversing valve (201), a second hydraulically controlled one-way valve (202) and a second one-way throttle valve (203); The oil supply pipeline (10) of the light pressure station oil cylinder (8) is connected to the hydraulic oil tank (6) via a second electromagnetic reversing valve (201), a second hydraulically controlled one-way valve (202) and a second one-way throttle valve (203); The oil return pipeline (11) of the light pressure station oil cylinder (8) is connected to the hydraulic oil tank (6) via a low-pressure relief valve (204), a second electromagnetic reversing valve (201), a second hydraulically controlled one-way valve (202), and a second one-way throttle valve (203).

6. The hydraulic system for an oil press according to claim 3, characterized in that: The heavy pressure module (3) comprises a third electromagnetic reversing valve (301), a third hydraulically controlled one-way valve (302) and a third one-way throttle valve (303); The oil supply pipeline (10) of the heavy pressure station oil cylinder (9) is connected to the hydraulic oil tank (6) through the third electromagnetic reversing valve (301), the third hydraulically controlled one-way valve (302) and the third one-way throttle valve (303); The oil return pipeline (11) of the heavy pressure station oil cylinder (9) is connected to the hydraulic oil tank (6) via a high-pressure relief valve (304), a third electromagnetic reversing valve (301), a third hydraulically controlled one-way valve (302) and a third one-way throttle valve (303).

7. The hydraulic system for an oil press according to claim 3, characterized in that: The pressure regulating module (5) further comprises an accumulator (504) and a pressure regulating relief valve (505); Another hydraulic pump of the multiple pump system (4) is connected to the pressurizing pipeline (17); The accumulator (504) is arranged between the hydraulic oil tank (6) and the pressurized pipeline (17) and is used to increase the pressure of the pressurized pipeline (17); The pressure regulating relief valve (505) connects the hydraulic oil tank (6) with the pressurized pipeline (17) and is used to regulate the pressure of the pressurized pipeline (17).

8. The hydraulic system for an oil press according to claim 3, characterized in that: The oil supply pipeline (10) connected to the multi-pump system (4) is also connected back to the hydraulic oil tank (6) through an oil supply overflow valve (12) for adjusting the pressure of the oil supply pipeline (10); The multiple pump system (4) comprises a plurality of hydraulic pumps (401) and a drive motor (402); the oil supply pipeline (10) is provided with a plurality of hydraulic pumps (401), and the drive motor (402) is connected to the hydraulic pump (401); An air filter (13) and a liquid level meter (14) are also provided in the hydraulic oil tank (6).

9. The hydraulic system for an oil press according to claim 3, characterized in that: An oil suction filter (15) is also provided between the oil supply pipeline (10) and the hydraulic oil tank (6), and an oil return filter (16) is also provided between the oil return pipeline (11) and the hydraulic oil tank (6).

10. A method for storing and pressurizing a hydraulic system of a hydraulic press according to any one of claims 3 to 9, characterized in that: The energy storage and pressurization method of the hydraulic system comprises: the following: S1: starting a part of the pumps of the multi-pump system (4) to increase the hydraulic pressure of the oil supply pipeline (10), and pressurizing the hydraulic oil in the hydraulic oil tank (6) to flow into the oil supply pipeline (10); S2: When the hydraulic press needs to be adjusted to a suitable position, the lifting module (1) transports the hydraulic oil in the hydraulic oil tank (6) to the work station cylinder (7), and the work station cylinder (7) drives the hydraulic press to move to a suitable processing position through a movable rod; S3: When the hydraulic press is required to perform light pressing, the light pressing module (2) transports the hydraulic oil in the hydraulic oil tank (6) to the light pressing station oil cylinder (8), and the light pressing station oil cylinder (8) of the hydraulic press performs stamping processing on the processing object; S4: When the hydraulic press is required to perform heavy pressing work, the heavy pressing module (3) transports the hydraulic oil in the hydraulic oil tank (6) to the heavy pressing station cylinder (9), and the heavy pressing station cylinder (9) of the hydraulic press performs stamping processing on the processing object; S5: When the punching force of the hydraulic press needs to be adjusted, another part of the pump of the multi-pump system (4) is started, and the hydraulic oil in the hydraulic oil tank (6) flows into the pressurized pipeline (17). The flow rate of the hydraulic oil flowing into the pressurized pipeline (17) is adjusted by the pressure regulating relief valve (505). Then, the accumulator (504) is opened to pressurize the hydraulic oil in the hydraulic oil tank (6) and flow it into the pressurizing pipeline (17) to form high-pressure hydraulic oil. Then, the pressure-regulating electro-hydraulic reversing valve (501), the pressure-regulating hydraulically controlled one-way valve (502) and the pressure-regulating one-way throttle valve (503) jointly regulate the high-pressure hydraulic oil in the pressurizing pipeline (17) to reach a suitable pressure, thereby regulating the punching force of the hydraulic press. S6: When it is necessary to adjust the light pressure position cylinder (8) or the heavy pressure position cylinder (9) of the hydraulic press to work, another part of the pumps and / or the accumulator (504) of the multi-pump system (4) can be started to make the hydraulic press work lightly or heavily.

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