Hydraulic system for transverse shearing of steel coil

Abstract

The invention discloses a steel coil transverse shearing hydraulic system, and relates to the technical field of hydraulic systems. The steel coil transverse shearing hydraulic system comprises an oil tank, a hydraulic pump, a motor body, an electromagnetic overflow valve, a valve control unit, a filtering and cooling unit and an energy storage module. By redesigning the hydraulic system, the problems that in the prior art, when strip steel is sheared by a transverse shear, an oil cylinder descends slowly, shearing is difficult, and a shearing opening is uneven are solved. The shearing speed and the pressure for shearing the thick belt are improved, and the shearing quality is guaranteed. And main parts of the plunger pump are pressed, so that the material strength is fully utilized, the service life is longer, the unit power mass is small, the failure rate of a hydraulic system is low, and a production line runs stably. Meanwhile, through the arrangement of a safety monitoring component and an auxiliary component, the safety and reliability of the system are improved, and maintenance and debugging of the system are facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic systems, in particular to a steel coil cross-cutting hydraulic system. Background Art

[0002] In the acid annealing process of steel strip production, the head of each roll needs to be welded to the tail of the previous roll, and the steel strip needs to be cut flat during the welding process.

[0003] In the existing acid annealing process for steel strip production, there are many problems in the uncoiling, recoiling and welding processes. The power source of the existing hydraulic station is a double-acting vane pump with a low rated working pressure (not exceeding 7MPa), while the high-pressure vane pump can reach 14-21MPa. When the hydraulic station supplies oil to other actuators at the same time, the shearing speed of the scissors cylinder is insufficient, making it difficult to cut a 5.9mm thick steel strip, affecting the process speed. In addition, the hydraulic station is relatively small, and the displacement is small when the high-pressure and low-pressure parts of the double-acting vane pump work at the same time, which affects the movement speed of the cylinder. The hydraulic station lacks a circulating filter element, the accuracy of the oil cannot be guaranteed, and the hydraulic valve core is easily blocked, which further leads to problems such as insufficient shearing speed and uneven shearing edge. In response to the shortcomings of the prior art, the present invention provides a steel coil cross-cutting hydraulic system to solve the above problems. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention provides a hydraulic system for cross-cutting steel coils. By redesigning the hydraulic system, it resolves existing issues such as slow cylinder descent, difficulty in shearing, and uneven cut edges during cross-cutting of steel strips. This system improves shearing speed and pressure for thick strips, ensuring shear quality. The main components of the plunger pump are all pressurized, fully utilizing the material's strength and extending its service life. The unit power consumption is low, the hydraulic system has a low failure rate, and the production line operates smoothly. Furthermore, the inclusion of safety monitoring components and auxiliary components enhances system safety and reliability, facilitating system maintenance and commissioning.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a steel coil cross-cutting hydraulic system, comprising an oil tank, a hydraulic pump, a motor body, an electromagnetic overflow valve, a valve control unit, a filter cooling unit, and an energy storage module;

[0006] The oil tank outlet is connected to the butterfly valve and high-pressure filter in sequence;

[0007] The hydraulic pump inlet is connected to the high-pressure filter outlet, and the outlet is installed with a first one-way valve;

[0008] The motor body drives the hydraulic pump through the coupling;

[0009] The electromagnetic overflow valve is connected in parallel to the hydraulic pump outlet pipeline;

[0010] Valve control unit, including:

[0011] an electromagnetic reversing valve, the inlet of which is connected to the outlet of the first one-way valve;

[0012] One-way throttle valve, the inlet is connected to the A / B working port of the electromagnetic reversing valve, and the outlet is connected to the scissor cylinder;

[0013] The filter cooling unit contains:

[0014] Oil return filter, connecting the actuator oil return line to the oil tank;

[0015] Circulation pump, the inlet is connected to the oil tank, and the outlet returns to the oil tank through the cooler;

[0016] The energy storage module includes an accumulator body and an accumulator control valve group. The accumulator body is connected in parallel to the first one-way valve outlet pipeline via the accumulator control valve group.

[0017] Preferably, the steel coil cross-shear hydraulic system further includes a safety monitoring component, and the safety monitoring component includes:

[0018] Liquid level gauge and liquid level relay are installed on the side wall of the fuel tank;

[0019] The temperature transmitter is inserted into the oil in the oil tank;

[0020] The pressure gauge body is connected to the main oil circuit through the pressure gauge switch;

[0021] Pressure sensor, threaded installation in the main oil circuit.

[0022] Preferably, the steel coil cross-shear hydraulic system further includes auxiliary components, which include:

[0023] a tank filter, disposed on the oil tank and used to filter the oil used to replenish the oil tank;

[0024] Shock absorber throat, installed on the inlet and outlet pipes of the hydraulic pump;

[0025] The pressure measuring joint is installed at the detection point of the main valve block.

[0026] Preferably, the hydraulic pump is a double plunger pump, and both pump outlets are provided with independent first one-way valves, and the two pump outlets are output in parallel through a three-way pipe fitting.

[0027] Preferably, the A / B ports of the electromagnetic reversing valve in the valve control unit are directly connected to the P1 / P2 ports of the one-way throttle valve respectively, forming a dual control structure of oil circuit direction and flow.

[0028] Preferably, the linkage logic of the safety monitoring component:

[0029] The liquid level relay triggers an alarm when the liquid level is less than 30% of the tank height;

[0030] The temperature transmitter triggers the cooler to start when the oil temperature is greater than 60°C;

[0031] The electromagnetic overflow valve opens when the pressure sensor triggers a pressure greater than 25 MPa.

[0032] Preferably, the accumulator body is of air bag type, and the pre-charge pressure is 70% of the system working pressure.

[0033] Preferably, the accumulator control valve group includes a stop valve and a safety valve, and the branch connection point is located upstream of the inlet of the electromagnetic reversing valve.

[0034] Preferably, the shock absorber throat is installed at the inlet and outlet of the hydraulic pump and is connected by a rubber hose with a length of 150±10 mm.

[0035] Preferably, a plurality of second one-way valves are connected in series to the pipeline between the circulation pump and the cooler, and the second one-way valves prevent the oil from flowing back.

[0036] The present invention discloses a steel coil cross-cutting hydraulic system, which has the following beneficial effects:

[0037] 1. The steel coil cross-shear hydraulic system has improved shearing performance. By redesigning the hydraulic system and selecting a plunger pump as the power source, the problems of insufficient shearing speed and uneven shearing edge of the original hydraulic system have been solved. It can effectively shear thick strip steel, improve shearing efficiency and quality, and ensure the smooth progress of the acid annealing process in steel strip production.

[0038] 2. The steel coil cross-shear hydraulic system has enhanced system stability and an additional energy storage module, which can store hydraulic system energy and quickly release it when needed, improving system response speed, making the hydraulic system work more smoothly, reducing the impact of pressure fluctuations on actuators, and extending equipment life. At the same time, safety monitoring components are used to monitor and automatically control the oil tank level, oil temperature, system pressure, etc. in real time, so that potential faults can be discovered and handled in a timely manner, improving system reliability and safety.

[0039] 3. The steel coil cross-cutting hydraulic system ensures the cleanliness of the oil. A high-pressure filter is installed before the hydraulic oil enters the hydraulic pump, a return oil filter is installed in the return oil pipeline, and a box filter is installed on the oil tank. Multi-stage filtration effectively removes oil impurities, improves oil cleanliness, prevents hydraulic valve core from getting stuck, reduces the failure rate of the hydraulic system, and ensures smooth operation of the production line. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0041] Figure 1 Schematic diagram of the system structure of the present invention.

[0042] In the figure: 1. Oil tank; 2. Tank filter; 3. Butterfly valve; 4. Hydraulic pump; 5. First one-way valve; 6. Motor; 7. Solenoid overflow valve; 8. Pressure gauge body; 9. Pressure gauge switch; 10. Solenoid reversing valve; 11. One-way throttle valve; 12. Liquid level gauge; 13. Pressure sensor; 14. Shock absorber throat; 15. Cooler; 16. Return oil filter; 17. Coupling; 18. High-pressure filter; 19. Temperature transmitter; 20. Liquid level relay; 21. Circulating pump; 22. Second one-way valve; 23. Pressure measuring joint; 24. Accumulator body; 25. Accumulator control valve group. DETAILED DESCRIPTION

[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0044] The embodiments of the present application provide a hydraulic system for shearing steel coils. By redesigning the hydraulic system, they address the existing problems of slow cylinder descent, difficulty in shearing, and uneven cuts when shearing steel strips. This improves the shearing speed and pressure for shearing thick strips, ensuring shearing quality. The main components of the plunger pump are all pressurized, fully utilizing the material's strength and extending its service life. The unit power-to-weight ratio is low, the hydraulic system has a low failure rate, and the production line operates smoothly. Furthermore, the provision of safety monitoring components and auxiliary components improves the safety and reliability of the system, facilitating system maintenance and commissioning.

[0045] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0046] Example 1: The present invention discloses a steel coil cross-cutting hydraulic system. Figure 1 As shown, it includes an oil tank 1, a hydraulic pump 4, a motor body 6, an electromagnetic overflow valve 7, a valve control unit, a filter cooling unit, and an energy storage module;

[0047] The outlet of tank 1 is connected in sequence to butterfly valve 3 and high-pressure filter 18. Tank 1 stores hydraulic oil, providing ample fluid for the system. Butterfly valve 3 controls the flow of fluid at the outlet of tank 1, while high-pressure filter 18 filters the fluid leaving tank 1, removing impurities and ensuring fluid cleanliness.

[0048] The inlet of the hydraulic pump 4 is connected to the outlet of the high-pressure filter 18, and the outlet is installed with a first one-way valve 5;

[0049] Motor 6 drives hydraulic pump 4 via coupling 17. Motor 6, acting as a power source, converts electrical energy into mechanical energy through rotation, driving hydraulic pump 4. Hydraulic pump 4 draws hydraulic oil from tank 1, filtered by high-pressure filter 18, pressurizes it, and delivers it as a high-pressure oil flow. A first check valve 5 ensures one-way flow of hydraulic oil, preventing backflow.

[0050] Solenoid relief valve 7 is connected in parallel to the outlet pipe of hydraulic pump 4. Solenoid relief valve 7 is used to set the maximum pressure of the system. When the system pressure exceeds the set value, solenoid relief valve 7 opens, returning the excess oil to tank 1, thus protecting the system.

[0051] Valve control unit, including:

[0052] The electromagnetic reversing valve 10 has an inlet connected to the outlet of the first one-way valve 5;

[0053] The one-way throttle valve 11 has an inlet connected to the A / B working port of the electromagnetic reversing valve 10 and an outlet connected to the scissor cylinder;

[0054] The solenoid directional valve 10 controls the flow of hydraulic oil through electromagnetic signals, achieving reciprocating motion of the actuator. The one-way throttle valve 11 controls the flow of hydraulic oil, thereby adjusting the speed of the actuator. Ports A and B of the solenoid directional valve 10 are directly connected to ports P1 and P2 of the one-way throttle valve 11, respectively, creating a dual control structure for both oil flow direction and flow.

[0055] The electromagnetic reversing valve 10 accurately controls the flow direction of the hydraulic oil, realizes flexible control of the action of the actuator, and meets different process requirements.

[0056] The one-way throttle valve 11 adjusts the flow of hydraulic oil, thereby controlling the movement speed of the actuator, ensuring the stability and accuracy of the shearing process, and improving the shearing quality.

[0057] The filter cooling unit contains:

[0058] The oil return filter 16 connects the actuator oil return line to the oil tank 1;

[0059] The circulation pump 21 has an inlet connected to the oil tank 1 and an outlet returned to the oil tank 1 through the cooler 15;

[0060] The return oil filter 16 further filters the hydraulic oil returned to the oil tank 1 after the actuators complete their work, removing impurities and keeping the oil clean. The circulating pump 21 draws the oil from the oil tank 1, cools it through the cooler 15, and then returns it to the oil tank 1, completing the internal circulation of the oil and reducing the oil temperature. The second check valve 22 prevents the oil from flowing back.

[0061] The energy storage module includes an accumulator body 24 and an accumulator control valve group 25 . The accumulator body 24 is connected in parallel to the outlet pipeline of the first one-way valve 5 via the accumulator control valve group 25 .

[0062] The accumulator body 24 is used to store energy in the hydraulic system and quickly release it when needed, improving the system's response speed. The accumulator control valve group 25 controls the filling and draining of the accumulator body 24. The accumulator body 24 is a bladder-type accumulator with a pre-charge pressure of 70% of the system's operating pressure.

[0063] The steel coil shear hydraulic system also includes safety monitoring components, which include:

[0064] The liquid level meter 12 and the liquid level relay 20 are installed on the side wall of the oil tank 1;

[0065] The temperature transmitter 19 is inserted into the oil in the oil tank 1;

[0066] The pressure gauge body 8 is connected to the main oil circuit through the pressure gauge switch 9;

[0067] The pressure sensor 13 is threadedly mounted on the main oil circuit.

[0068] The liquid level gauge 12 and liquid level relay 20 monitor the oil level in the fuel tank 1 in real time. The liquid level relay 20 triggers an alarm when the liquid level falls below 30% of the tank 1 height. The temperature transmitter 19 monitors the oil temperature and activates the cooler 15 when the oil temperature exceeds 60°C. The pressure gauge 8 monitors the system pressure in real time. The operator can control the pressure gauge 8 on and off using the pressure gauge switch 9, making it easy to read the pressure value. The pressure sensor 13 converts the pressure signal into an electrical signal and feeds it back to the control system for automatic control. The electromagnetic relief valve 7 opens when the trigger pressure exceeds 25MPa.

[0069] Example 2: The present invention discloses a steel coil cross-cutting hydraulic system. Figure 1 As shown, it includes an oil tank 1, a hydraulic pump 4, a motor body 6, an electromagnetic overflow valve 7, a valve control unit, a filter cooling unit, and an energy storage module;

[0070] The outlet of tank 1 is connected in sequence to butterfly valve 3 and high-pressure filter 18. Tank 1 stores hydraulic oil, providing ample fluid for the system. Butterfly valve 3 controls the flow of fluid at the outlet of tank 1, while high-pressure filter 18 filters the fluid leaving tank 1, removing impurities and ensuring fluid cleanliness.

[0071] The inlet of the hydraulic pump 4 is connected to the outlet of the high-pressure filter 18, and the outlet is installed with a first one-way valve 5;

[0072] Motor 6 drives hydraulic pump 4 via coupling 17. Motor 6, acting as a power source, converts electrical energy into mechanical energy through rotation, driving hydraulic pump 4. Hydraulic pump 4 draws hydraulic oil from tank 1, filtered by high-pressure filter 18, pressurizes it, and delivers it as a high-pressure oil flow. A first check valve 5 ensures one-way flow of hydraulic oil, preventing backflow.

[0073] The steel coil cross-cutting hydraulic system also includes auxiliary components, which include:

[0074] The tank filter 2 is provided on the oil tank 1 and is used to filter the oil added to the oil tank; the tank filter 2 ensures that the oil added to the oil tank 1 is clean and reduces the impact of impurities on the system.

[0075] The shock absorber throat 14 is installed on the inlet and outlet pipes of the hydraulic pump 4; the shock absorber throat 14 is used to absorb the pressure fluctuation of the hydraulic system and reduce vibration and noise;

[0076] The pressure measuring joint 23 is located at the main valve block detection point. The pressure measuring joint 23 is used to connect pressure testing equipment to facilitate system pressure detection and debugging.

[0077] The hydraulic pump 4 is a double plunger pump, and both pump outlets are provided with independent first one-way valves 5, and the two pump outlets are output in parallel through a three-way pipe fitting.

[0078] Shock absorber hoses 14 absorb pressure fluctuations in the hydraulic system, reducing vibration and noise. Pressure test connectors 23 connect to pressure testing equipment, facilitating pressure testing and debugging of the system. Shock absorber hoses 14 are installed at the inlet and outlet of the hydraulic pump 4 and are connected using a rubber hose with a length of 150 ± 10 mm.

[0079] The accumulator control valve assembly 25 includes a shutoff valve and a safety valve, with a branch connection point located upstream of the inlet of the solenoid reversing valve 10. When the system requires a rapid response, the accumulator body 24 releases stored energy, improving the system's response speed and ensuring the timeliness and accuracy of the shearing process. The accumulator control valve assembly 25 precisely controls the filling and draining of the accumulator body 24, ensuring proper accumulator operation.

[0080] The pipeline between the circulation pump 21 and the cooler 15 is connected in series with multiple sets of second one-way valves 22, and the second one-way valves 22 prevent the oil from flowing back.

[0081] The operation steps of the steel coil cross-cutting hydraulic system are as follows:

[0082] The motor body 6 is started, and the motor body 6 drives the hydraulic pump 4 to rotate through the coupling 17. The hydraulic pump 4 draws the hydraulic oil filtered by the high-pressure filter 18 from the oil tank 1, and outputs it after pressurizing it to form a high-pressure oil flow.

[0083] After the high-pressure oil flows through the first one-way valve 5, the flow direction of the hydraulic oil is controlled by the electromagnetic reversing valve 10 according to process requirements, so that the hydraulic oil flows to the scissor cylinder or other actuators.

[0084] The flow of hydraulic oil is adjusted by the one-way throttle valve 11 to control the movement speed of the actuator.

[0085] After the actuator completes its work, the hydraulic oil flows back to the oil tank 1 through the return oil filter 16 to further filter out impurities and keep the oil clean.

[0086] The circulation pump 21 draws the oil from the oil tank 1, cools it in the cooler 15 and returns it to the oil tank 1, thus realizing the internal circulation of the oil and reducing the oil temperature.

[0087] The safety monitoring component monitors various system parameters in real time, such as liquid level, temperature, pressure, etc. When the parameters are abnormal, corresponding measures are taken, such as alarm, starting the cooler 15, opening the electromagnetic overflow valve 7, etc., to ensure safe and stable operation of the system.

[0088] When needed, the accumulator body 24 releases the stored energy, improving the response speed of the system.

[0089] The system can be easily pressure tested and debugged through the pressure measuring joint 23.

[0090] The steel coil cross-cutting hydraulic system achieves the following effects:

[0091] The shearing performance has been improved by redesigning the hydraulic system and selecting a plunger pump as the power source, which solves the problems of insufficient shearing speed and uneven shearing edge of the original hydraulic system. It can effectively shear thick strip steel, improves shearing efficiency and quality, and ensures the smooth progress of the acid annealing process in steel strip production.

[0092] The system stability is enhanced, and an energy storage module is added to store hydraulic system energy and quickly release it when needed, which improves the system response speed, makes the hydraulic system work more smoothly, reduces the impact of pressure fluctuations on actuators, and extends the service life of the equipment. At the same time, through safety monitoring components, the oil tank level, oil temperature, system pressure, etc. are monitored and automatically controlled in real time to promptly detect and handle potential faults, thereby improving the reliability and safety of the system.

[0093] The cleanliness of the oil is guaranteed. A high-pressure filter 18 is installed before the hydraulic oil enters the hydraulic pump 4, a return oil filter 16 is installed on the return oil pipeline, and a box filter 2 is installed on the oil tank 1. Multi-stage filtration effectively removes oil impurities, improves oil cleanliness, prevents hydraulic valve spool from getting stuck, reduces the failure rate of the hydraulic system, and ensures smooth operation of the production line.

[0094] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0095] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. The hydraulic system for shearing steel coils is characterized by: include: The oil tank (1) has its outlet connected in sequence to a butterfly valve (3) and a high-pressure filter (18); A hydraulic pump (4), the inlet of which is connected to the outlet of a high-pressure filter (18), and the outlet of which is provided with a first one-way valve (5); The motor body (6) drives the hydraulic pump (4) through the coupling (17); An electromagnetic overflow valve (7) is connected in parallel to the outlet pipeline of the hydraulic pump (4); Valve control unit, including: an electromagnetic reversing valve (10), the inlet of which is connected to the outlet of the first one-way valve (5); A one-way throttle valve (11), the inlet of which is connected to the A / B working port of the electromagnetic reversing valve (10), and the outlet of which is connected to the scissor cylinder; Filter cooling unit, including: An oil return filter (16) is connected to the oil return line of the actuator to the oil tank (1); A circulating pump (21), the inlet of which is connected to the oil tank (1), and the outlet of which returns to the oil tank (1) via the cooler (15); The energy storage module comprises an accumulator body (24) and an accumulator control valve group (25). The accumulator body (24) is connected in parallel to the outlet pipeline of the first one-way valve (5) via the accumulator control valve group (25).

2. The steel coil cross-cutting hydraulic system according to claim 1, characterized in that: The steel coil cross-cutting hydraulic system further includes a safety monitoring component, which includes: A liquid level meter (12) and a liquid level relay (20) are mounted on the side wall of the oil tank (1); A temperature transmitter (19) is inserted into the oil in the oil tank (1); The pressure gauge body (8) is connected to the main oil circuit via the pressure gauge switch (9); The pressure sensor (13) is threadedly mounted on the main oil circuit.

3. The steel coil cross-cutting hydraulic system according to claim 1, characterized in that: The steel coil cross-cutting hydraulic system further includes auxiliary components, which include: A tank filter (2) is provided on the oil tank (1) and is used to filter the oil used to replenish the oil tank; A shock absorber throat (14) is installed on the inlet and outlet pipes of the hydraulic pump (4); The pressure measuring joint (23) is provided at the detection point of the main valve block.

4. The steel coil cross-cutting hydraulic system according to claim 1, characterized in that: The hydraulic pump (4) is a double plunger pump, and both pump outlets are provided with independent first one-way valves (5), and the two pump outlets are connected in parallel for output via a three-way pipe fitting.

5. The steel coil cross-cutting hydraulic system according to claim 1, characterized in that: The A / B ports of the electromagnetic reversing valve (10) in the valve control unit are directly connected to the P1 / P2 ports of the one-way throttle valve (11), respectively, forming a dual control structure for oil circuit direction and flow rate.

6. The steel coil cross-cutting hydraulic system according to claim 2, characterized in that: The linkage logic of the safety monitoring components: The liquid level relay (20) triggers an alarm when the liquid level is less than 30% of the height of the oil tank (1); The temperature transmitter (19) triggers the cooler (15) to start when the oil temperature is greater than 60°C; When the trigger pressure of the pressure sensor (13) is greater than 25 MPa, the electromagnetic overflow valve (7) is opened.

7. The steel coil cross-cutting hydraulic system according to claim 1, characterized in that: The accumulator body (24) is of air bag type, and the pre-charge pressure is 70% of the system working pressure.

8. The steel coil cross-cutting hydraulic system according to claim 7, characterized in that: The accumulator control valve group (25) includes a stop valve and a safety valve, and the branch connection point is located upstream of the inlet of the electromagnetic reversing valve (10).

9. The steel coil cross-cutting hydraulic system according to claim 3, characterized in that: The shock-absorbing throat (14) is installed at the inlet and outlet of the hydraulic pump (4) and is connected by a rubber hose.

10. The steel coil cross-cutting hydraulic system according to claim 1, characterized in that: A plurality of second one-way valves (22) are connected in series to the pipeline between the circulation pump (21) and the cooler (15), and the second one-way valves (22) prevent the oil from flowing back.

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