Hydraulic oil supply system of large machining equipment

Abstract

The invention relates to the technical field of hydraulic oil supply, in particular to a hydraulic oil supply system of large machining equipment, which comprises an oil tank, a power unit and a pressure relief structure, the pressure relief structure comprises an oil pressure part body, and a first cavity with an opening is formed in the oil pressure part body; an oil inlet and an oil return port which are communicated with the first cavity are formed in the surface of the oil pressure part body, the oil return port is communicated with an oil tank, a body cover is arranged at one end of the oil pressure part body, an oil outlet valve and a pressure relief backflow assembly are arranged in the first cavity, the oil outlet valve is communicated with the oil inlet, and the pressure relief backflow assembly is used for adjusting oil pressure in the first cavity; when the oil pressure in the first cavity is large, the oil return opening is communicated with the first cavity, and when the oil pressure in the first cavity is small, the oil return opening is separated from the first cavity. The oil tank, the power unit and the pressure relief structure are arranged, so that damage to the actuator and other system components due to too high or too low oil pressure is effectively avoided, and the stability and reliability of equipment operation are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic oil supply, and particularly to a hydraulic oil supply system for large-scale processing equipment. Background Art

[0002] At present, with the rapid development of the high-end manufacturing industry, large-scale processing equipment is widely used in core fields such as automobile manufacturing, shipbuilding, and precision machining. Its operation stability and processing accuracy directly determine the quality and production efficiency of industrial products. As the power transmission center of large-scale processing equipment, the hydraulic system drives the actuator to complete complex mechanical actions through the pressure conversion of hydraulic oil, and the performance of the hydraulic oil supply system is the key to ensuring the stable operation of the hydraulic system. There are many technical problems to be solved urgently in the existing hydraulic oil supply systems for large-scale processing equipment. On the one hand, the limitations of the pressure regulation mechanism are prominent. Traditional pressure relief devices such as relief valves usually adopt fixed pressure threshold settings, which are difficult to adapt to the dynamic pressure requirements of the equipment under different working conditions. When the equipment is in a high-load processing condition, the system needs to establish a higher oil pressure to drive the actuator, but the traditional pressure relief device may open for pressure relief in advance due to unreasonable pressure threshold settings, resulting in the system pressure being unable to meet the working requirements of the actuator and causing problems such as slow action. When the oil pressure rises abnormally, there may also be a delay in pressure relief, causing the excessive oil pressure to impact components such as pipelines and seals, accelerating the aging and damage of the equipment. In addition, most existing systems lack the ability to monitor and intelligently adjust the oil pressure changes in real time and accurately, and cannot quickly respond to the pressure fluctuations caused by sudden load changes, seriously affecting the continuous and stable operation of the equipment. Summary of the Invention

[0003] In view of the above problems, a hydraulic oil supply system for large-scale processing equipment is provided. By setting up an oil tank, a power unit, and a pressure relief structure, the damage to the actuator and other system components caused by too high or too low oil pressure can be effectively avoided, and the operation stability and reliability of the equipment can be significantly improved.

[0004] To solve the problems of the prior art, the present invention provides a hydraulic oil supply system for large processing equipment, which includes an oil tank, a power unit and a pressure relief structure respectively arranged at both ends of the oil tank. The pressure relief structure includes an oil pressure part body arranged at the upper end of the oil tank body. A first cavity with an opening is arranged inside the oil pressure part body. The first cavity is used to store part of the oil. An oil inlet and an oil return port communicating with the first cavity are arranged on the surface of the oil pressure part body. The oil return port is communicated with the oil tank. One end of the oil pressure part body is provided with a body cover, and the body cover covers the opening end of the first cavity. An oil outlet valve and a pressure relief return assembly are arranged in the first cavity. The oil outlet valve is communicated with the oil inlet. The pressure relief return assembly is used to adjust the oil pressure in the first cavity. When the oil pressure in the first cavity is relatively large, the pressure relief return assembly is in an open state, and the oil return port is communicated with the first cavity. When the oil pressure in the first cavity is relatively small, the pressure relief return assembly is in a closed state, and the oil return port is separated from the first cavity.

[0005] Preferably, a second cavity communicating with the first cavity is arranged inside the body cover. A reset switch structure that can convert oil pressure into auxiliary self-working is movably arranged in the second cavity. The reset switch structure automatically switches the state of the pressure relief return assembly according to the change of the oil pressure in the first cavity.

[0006] Preferably, a pressure inlet and a pressure relief port are arranged on the side wall of the body cover. The end of the reset switch structure facing the closed end of the second cavity abuts against the inner wall of the second cavity to form an independent cavity. The pressure inlet and the pressure relief port are both communicated with the independent cavity.

[0007] Preferably, a pressure maintaining monitoring structure for monitoring the internal air pressure of the independent cavity is arranged beside the body cover. The pressure maintaining monitoring structure is connected to the pressure inlet.

[0008] Preferably, a pressure maintaining control structure for controlling the internal air pressure of the independent cavity to be stable is arranged on the outer wall of the body cover.

[0009] Preferably, the pressure relief return assembly includes a cylinder body with a third cavity inside, a check valve and a valve seat; a return cavity is formed between the outer wall of the cylinder body and the inner wall of the first cavity. The return cavity is communicated with the oil return port, and an oil discharge port is arranged on the outer wall of the cylinder body; the check valve communicates the oil inlet and the third cavity; the valve seat is used to control the opening and closing of the check valve.

[0010] Preferably, there are multiple oil discharge ports, and the multiple oil discharge ports are arranged at equal intervals on the outer wall of the cylinder body.

[0011] Preferably, the reset switch structure includes a movable top block and a self-resetting assembly; the outer peripheral wall of the movable top block abuts against the inner wall of the second cavity, and one end of the movable top block is connected to the valve seat; the self-resetting assembly is arranged at the closed end of the second cavity, and the self-resetting assembly is used to provide a force for the movable top block towards the pressure relief return assembly.

[0012] Preferably, the self - resetting component includes a guide rod and an elastic member; one end of the guide rod is connected to the body cover, and the axis of the guide rod extends vertically towards the first cavity, and the movable top block is movably connected to the guide rod; the elastic member is arranged between the movable top block and the closed end of the second cavity, and the elastic member exerts a force on the movable top block towards the first cavity.

[0013] Preferably, the pressure - maintaining control structure includes a travel switch and a detection rod; the travel switch is connected to the body cover; one end of the detection rod extends into the interior of the body cover and is connected to the movable top block, and the other end of the detection rod is used for docking and cooperating with the travel switch.

[0014] The beneficial effects of the present invention compared with the prior art are as follows: 1. The present invention is provided with an oil tank, a power unit and a pressure - relief structure. The power unit provides the flowing power for the hydraulic oil, sucks out the hydraulic oil in the oil tank and pressurizes and conveys it to various parts of the system. The pressure - relief return assembly in the pressure - relief structure automatically adjusts according to the oil - pressure change. When the oil pressure exceeds the normal working range of the actuator, it timely opens the communication between the oil inlet and the oil return port. After the oil pressure returns to normal, it timely cuts off the oil inlet and the oil return port. Through the automatic adjustment mechanism of the pressure - relief return assembly, the system can maintain the hydraulic - oil pressure for driving the actuator to work stably within the normal working range, thereby effectively avoiding the damage caused to the actuator and other system components due to too high or too low oil pressure, and significantly improving the stability and reliability of the equipment operation.

[0015] 2. The present invention is provided with a reset - switch structure. When the system is not started, the force exerted by the reset - switch structure on the pressure - relief return assembly is greater than the oil - fluid pressure, so that the pressure - relief return assembly remains closed, effectively preventing the oil - fluid from flowing back, maintaining the static stable distribution of the oil - fluid inside the system, and ensuring the system is in a safe and stable state before starting. After the power unit is started, the oil - fluid pressure rises, pushing the pressure - relief return assembly to move, driving the reset - switch structure to move synchronously. The reset - switch structure absorbs part of the oil - fluid pressure and converts it into an increased force on the pressure - relief return assembly, causing part of the hydraulic oil to flow back and reducing the system oil pressure. When the oil pressure decreases, the reset - switch structure uses the stored energy to push the pressure - relief return assembly to reset, cutting off the connection between the oil return port and the first cavity. By absorbing part of the pressure of the oil - fluid during the working process by the reset - switch structure and converting it into its own force on the pressure - relief return assembly, the effective recovery and reuse of energy are realized.

[0016] 3. The present invention opens a pressurizing port and a pressure - relief port communicating with the second cavity on the body cover. By pumping compressed air into the independent cavity through the pressurizing port and closing the pressure - relief port, the increased air pressure is transmitted through the reset - switch structure, providing an additional pressure for the pressure - relief return assembly and enhancing its closing stability. Through the air - pressure pre - pressurization mechanism, the problem that the pressure - relief return assembly is accidentally opened during the high - oil - pressure operation of large - scale processing equipment is effectively solved, ensuring that the system can smoothly establish the working pressure required by the actuator during the start - up stage. Description of the Drawings

[0017] Figure 1 It is a perspective view of the hydraulic oil supply system of the large-scale processing equipment of the present invention.

[0018] Figure 2 It is a perspective view of the pressure relief structure in the hydraulic oil supply system of the large-scale processing equipment of the present invention.

[0019] Figure 3 It is a front view of the oil pressure part body, body cover, oil outlet valve, pressure relief return assembly, reset switch structure and pressure maintaining control structure in the hydraulic oil supply system of the large-scale processing equipment of the present invention.

[0020] Figure 4 It is Figure 3 a plane cross-sectional view at A-A in

[0021] Figure 5 It is Figure 3 a perspective cross-sectional view at A-A in

[0022] Figure 6 It is a perspective view of the body cover, movable top block and pressure maintaining monitoring structure in the hydraulic oil supply system of the large-scale processing equipment of the present invention.

[0023] Figure 7 It is a perspective view of the body cover, reset switch structure and pressure maintaining control structure in the hydraulic oil supply system of the large-scale processing equipment of the present invention.

[0024] Figure 8 It is an exploded view of the cylinder block, check valve, valve seat and movable top block in the hydraulic oil supply system of the large-scale processing equipment of the present invention.

[0025] Figure 9 It is a perspective view of the movable top block and self-resetting assembly in the hydraulic oil supply system of the large-scale processing equipment of the present invention.

[0026] Figure 10 It is an exploded view of the movable top block, guide rod and elastic member in the hydraulic oil supply system of the large-scale processing equipment of the present invention.

[0027] Figure 11 It is a solid of the movable top block, detection rod and travel switch in the hydraulic oil supply system of the large-scale processing equipment of the present invention.

[0028] The reference numerals in the figure are: 1, fuel tank; 2, power unit; 3, pressure relief structure; 31, main body of the oil pressure part; 311, first cavity; 312, oil inlet; 313, oil return port; 32, main body cover; 321, second cavity; 322, pressure port; 323, pressure relief port; 33, oil outlet valve; 34, pressure relief and reflux assembly; 341, cylinder block; 3411, third cavity; 3412, oil discharge port; 342, check valve; 343, valve seat; 35, reset switch structure; 351, movable top block; 352, self-resetting assembly; 3521, guide rod; 3522, elastic member; 36, pressure maintaining and monitoring structure; 37, pressure maintaining control structure; 371, detection rod; 372, travel switch. Detailed implementation mode

[0029] To further understand the features, technical means, specific purposes and functions achieved by the present invention, the present invention will be described in further detail below with reference to the drawings and specific implementation modes.

[0030] Refer to Figures 1 to 11 As shown: The hydraulic oil supply system of a large processing equipment includes a fuel tank 1, a power unit 2 and a pressure relief structure 3 respectively arranged at both ends of the fuel tank 1. The pressure relief structure 3 includes a main body of the oil pressure part 31 arranged at the upper end of the main body of the fuel tank 1. The interior of the main body of the oil pressure part 31 is provided with a first cavity 311 having an opening. The first cavity 311 is used to store part of the oil. An oil inlet 312 and an oil return port 313 communicating with the first cavity 311 are opened on the surface of the main body of the oil pressure part 31. The oil return port 313 communicates with the fuel tank 1. One end of the main body of the oil pressure part 31 is provided with a main body cover 32. The main body cover 32 covers the opening end of the first cavity 311. An oil outlet valve 33 and a pressure relief and reflux assembly 34 are arranged in the first cavity 311. The oil outlet valve 33 communicates with the oil inlet 312. The pressure relief and reflux assembly 34 is used to adjust the oil pressure in the first cavity 311. When the oil pressure in the first cavity 311 is relatively high, the pressure relief and reflux assembly 34 is in an open state, and the oil return port 313 communicates with the first cavity 311. When the oil pressure in the first cavity 311 is relatively low, the pressure relief and reflux assembly 34 is in a closed state, and the oil return port 313 is cut off from the first cavity 311.

[0031] Before the system starts, the fuel tank 1 stores a sufficient amount of hydraulic oil. At this time, the pressure relief and return assembly 34 is in the closed state, and the oil return port 313 is separated from the first cavity 311, ensuring that the hydraulic oil will not flow back to the fuel tank 1 without pressure drive, maintaining the static stability inside the system. When the equipment needs to call the hydraulic oil, the power unit 2 starts. The power unit 2 is usually composed of equipment such as pumps. By applying suction to the hydraulic oil in the fuel tank 1, the hydraulic oil is sucked out of the fuel tank 1 and pressurized. The pressurized hydraulic oil first flows into the pressure relief structure 3, enters the first cavity 311 through the oil inlet 312, and then flows out through the oil outlet valve 33, and is delivered to other parts of the system, such as actuators, to drive the actuators to complete the required mechanical actions. During the operation of the actuator, if the hydraulic oil pressure for driving the actuator in the system is too high, the oil pressure in the first cavity 311 also increases accordingly. At this time, the pressure relief and return assembly 34 receives a large force away from the inside of the first cavity 311. When this force exceeds the set threshold of the pressure relief and return assembly 34, the pressure relief and return assembly 34 opens, and the oil return port 313 is connected to the first cavity 311. Part of the hydraulic oil flows back to the fuel tank 1 through the oil return port 313, reducing the hydraulic oil pressure for driving the actuator in the system. As the oil pressure decreases, when the oil pressure drops to the normal oil pressure range for the operation of the actuator, the force received by the pressure relief and return assembly 34 decreases to below the set threshold, and the pressure relief and return assembly 34 switches to the closed state, effectively preventing the hydraulic oil from continuing to flow back to the fuel tank 1, maintaining the system oil pressure stable within the pressure range for the normal operation of the actuator. After the actuator completes the mechanical action, the hydraulic oil will go through a series of processing processes such as cooling and filtering, and then flow back to the fuel tank 1, completing a complete hydraulic oil circulation process. Through the automatic adjustment mechanism of the pressure relief and return assembly 34, the system can maintain the hydraulic oil pressure for driving the actuator stable within the normal working range, thereby effectively avoiding damage to the actuator and other system components caused by too high or too low oil pressure, and significantly improving the stability and reliability of the equipment operation.

[0032] Refer to Figure 3 and Figure 4 As shown: A second cavity 321 communicating with the first cavity 311 is opened inside the body cover 32. A reset switch structure 35 that can convert the oil pressure into auxiliary self-operation is movably arranged in the second cavity 321. The reset switch structure 35 automatically switches the state of the pressure relief and return assembly 34 according to the oil pressure change in the first cavity 311.

[0033] When the system is not started, the oil pressure in the first cavity 311 is in the initial low-pressure state. At this time, the force exerted by the reset switch structure 35 on the pressure relief and return assembly 34 is greater than the pressure of the oil on the pressure relief and return assembly 34. Under the action of this pressure difference, the pressure relief and return assembly 34 remains closed, effectively preventing the oil from flowing back to the fuel tank 1 through the oil return port 313, maintaining the static and stable distribution of the oil inside the system, and ensuring that the system is in a safe and stable state before startup. When the power unit 2 is started, devices such as the pump start to work, sucking and pressurizing the hydraulic oil in the fuel tank 1. As the pressurized hydraulic oil flows into the first cavity 311 of the pressure relief structure 3, the oil pressure inside the system gradually increases. When the pressure of the oil on the pressure relief and return assembly 34 exceeds the force exerted by the reset switch structure 35 on it, the pressure of the oil pushes the pressure relief and return assembly 34 to move. At the same time, the movement of the pressure relief and return assembly 34 drives the reset switch structure 35 to move synchronously in the second cavity 321. During this process, the reset switch structure 35 absorbs part of the pressure of the oil and converts it into an increased force exerted on the pressure relief and return assembly 34 by itself. At this time, the oil return port 313 is communicated with the first cavity 311, and part of the hydraulic oil flows back to the fuel tank 1 through the oil return port 313. The oil pressure of the hydraulic oil used to drive the actuator to work inside the system begins to decrease. During the process of the oil pressure decreasing, the pressure of the hydraulic oil on the pressure relief and return assembly 34 gradually decreases. When the system oil pressure drops to a certain extent and the pressure of the hydraulic oil on the pressure relief and return assembly 34 is less than the force exerted by the reset switch structure 35 on it, the reset switch structure 35 uses the energy stored in itself to push the pressure relief and return assembly 34 to reset. The reset of the pressure relief and return assembly 34 cuts off the communication path between the oil return port and the first cavity 311, preventing the hydraulic oil from continuing to flow back to the fuel tank 1, and stabilizing the system oil pressure within the pressure range for the normal operation of the actuator, providing guarantee for the stable operation of the equipment. By absorbing part of the pressure of the oil during the working process by the reset switch structure 35 and converting it into the force exerted on the pressure relief and return assembly 34 by itself, the effective recovery and reuse of energy are realized.

[0034] Refer to Figure 5 and Figure 6 As shown: A pressurizing port 322 and a pressure relief port 323 are provided on the side wall of the body cover 32. The end of the reset switch structure 35 facing the closed second cavity 321 abuts against the inner wall of the second cavity 321 to form an independent cavity. Both the pressurizing port 322 and the pressure relief port 323 are communicated with the independent cavity.

[0035] Before the system starts, according to the equipment working condition requirements, compressed air is pumped into the independent cavity through the pressurizing port 322, and the pressure relief port 323 is closed. As the air is continuously injected, the air pressure in the independent cavity gradually increases. The compressed air generates a force acting in the direction of the pressure relief and reflux assembly 34. This force is transmitted through the reset switch structure 35, causing the pressure relief and reflux assembly 34 to receive an additional pressure pointing towards the inside of the first cavity 311, enhancing the stability of its closed state. This ensures that at the initial stage of system startup, even if the oil pressure begins to rise, the pressure relief and reflux assembly 34 will not open prematurely due to insufficient pressure. When the power unit 2 starts, the hydraulic oil flows into the first cavity 311 under pressure, and the system oil pressure begins to rise. At this time, due to the air pressure force established during the pre-pressurization stage, the pressure relief and reflux assembly 34 remains closed when the oil pressure has not reached the set threshold, ensuring the continuous increase of the hydraulic oil pressure to meet the high oil pressure working requirements of the actuator. As the oil pressure continues to rise, the pressure of the oil on the pressure relief and reflux assembly 34 gradually increases. When the system oil pressure exceeds the set value for the normal operation of the actuator, the pressure relief port 323 is opened, and the compressed air in the independent cavity is quickly discharged, causing the air pressure to decrease. At this time, the air pressure force acting on the reset switch structure 35 is greatly reduced, and the pressure of the oil on the pressure relief and reflux assembly 34 exceeds the remaining force of the reset switch structure 35, so the pressure relief and reflux assembly 34 opens. Part of the hydraulic oil flows back to the fuel tank 1 through the oil return port 313, realizing the regulation of the system oil pressure and preventing damage to equipment components due to excessive oil pressure. Through the air pressure pre-pressurization mechanism, the problem of premature opening of the pressure relief and reflux assembly 34 during the high oil pressure operation of large processing equipment is effectively solved, ensuring that the system can smoothly establish the working pressure required by the actuator during the startup stage.

[0036] Refer to Figure 6 As shown in the figure: A pressure-holding monitoring structure 36 for monitoring the air pressure inside the independent cavity is provided beside the body cover 32, and the pressure-holding monitoring structure 36 is connected to the pressurizing port 322.

[0037] During the operation of the system, the pressure-holding monitoring structure 36 continuously monitors the air pressure in the independent cavity dynamically. Due to factors such as equipment manufacturing tolerances and seal aging, air may leak from the gap between the body cover 32 and the reset switch structure 35, causing the air pressure in the independent cavity to decrease. The pressure-holding monitoring structure 36 monitors the air pressure change in the independent cavity at all times. When the pressure-holding monitoring structure 36 detects a decrease in the air pressure in the independent cavity, air is pumped into the independent cavity through the pressurizing port 322 to ensure that the force acting on the pressure relief and reflux assembly 34 towards the inside of the first cavity 311 remains constant, maintaining the stability of the system pressure regulation. Thus, the air pressure fluctuation caused by gas leakage is effectively compensated, ensuring that the force acting on the pressure relief and reflux assembly 34 is constant and avoiding the problem of out-of-control oil pressure caused by air pressure changes.

[0038] Refer to Figure 7As shown: A pressure-holding control structure 37 for controlling the air pressure inside the stable independent cavity of the pressure-holding monitoring structure 36 is provided on the outer wall of the body cover 32.

[0039] After the air pressure in the independent cavity and the reset switch structure 35 apply a force to the pressure relief and return component 34 to overcome the oil pressure and separate the first cavity 311 and the oil return port 313, if air continues to be pumped into the independent cavity, the force acting on the pressure relief and return component 34 towards the inside of the first cavity 311 will continue to increase, and a greater oil pressure is required to push the pressure relief and return component 34 to move. This will result in a relatively high oil pressure for controlling the actuator in the system. Therefore, the pressure-holding control structure 37 is provided. After the pressure relief and return component 34 overcomes the resistance of the oil pressure to separate the first cavity 311 and the oil return port 313, the pressure-holding control structure 37 sends a signal to the pressure-holding monitoring structure 36, and the pressure-holding monitoring structure 36 maintains the air pressure inside the independent cavity at this moment unchanged, so that the pressure relief and return component 34 is in force balance. When the oil pressure in the system increases due to changes in the actuator load, the force of the oil pressure on the pressure relief and return component 34 exceeds its resistance in the balanced state. At this time, the pressure relief and return component 34 generates displacement under the action of the oil pressure, thus effectively avoiding the abnormal increase in the system oil pressure caused by excessive air pressure accumulation, improving the accuracy and stability of pressure regulation, and ensuring that the working pressure of the actuator is always within a reasonable range.

[0040] Refer to Figure 5 and Figure 8 As shown: The pressure relief and return component 34 includes a cylinder block 341 with a third cavity 3411 formed inside, a check valve 342, and a valve seat 343; a return cavity is formed between the outer wall of the cylinder block 341 and the inner wall of the first cavity 311, the return cavity is communicated with the oil return port 313, and an oil drain port 3412 is provided on the outer wall of the cylinder block 341; the check valve 342 communicates the oil inlet 312 and the third cavity 3411; the valve seat 343 is used to control the opening and closing of the check valve 342.

[0041] The cylinder block 341 divides the first cavity 311 into a first part and a second part. One end of the reset switch structure 35 extends into the third cavity 3411 and is connected to the valve seat 343, and the reset switch structure 35 is sealingly connected to the inner wall of the third cavity 3411. Under the action of the reset switch structure 35, the valve seat 343 abuts against the check valve 342, blocking the communication path between the oil inlet 312 and the third cavity 3411, and the hydraulic oil cannot enter the third cavity 3411 through the check valve 342. At this time, the hydraulic oil will exert a force on the valve seat 343 towards the second cavity 321. When the force of the hydraulic oil on the valve seat 343 is greater than the force of the reset switch structure 35 on the valve seat 343, the valve seat 343 separates from the check valve 342, the check valve 342 opens, and the hydraulic oil then enters the third cavity 3411 from the first part of the first cavity 311 through the check valve 342, and then flows into the second part (i.e., the return cavity) of the first cavity 311 through the oil drain port 3412 on the outer wall of the cylinder block 341, and finally returns to the fuel tank 1 through the oil return port 313, thereby realizing providing a return channel for the hydraulic oil and releasing the excess oil pressure.

[0042] Refer to Figure 8 As shown: There are multiple oil drain ports 3412, and the multiple oil drain ports 3412 are arranged at equal intervals on the outer wall of the cylinder block 341.

[0043] After the valve seat 343 separates from the check valve 342, the hydraulic oil will quickly enter the third cavity 3411. If the oil cannot flow out of the third cavity 3411 quickly, the oil pressure in the third cavity 3411 will increase, resulting in a slowdown in the rate of decrease of the oil pressure in the system. By arranging multiple oil drain ports 3412 on the cylinder block 341, when the system oil pressure rises and the force of the hydraulic oil on the valve seat 343 exceeds the resistance exerted by the reset switch structure 35, the valve seat 343 separates from the check valve 342, the check valve 342 opens, and the hydraulic oil quickly surges into the third cavity 3411. At this time, the multiple oil drain ports 3412 open synchronously, forming a parallel pressure relief channel. The flow rate of the hydraulic oil in the third cavity 3411 is inversely proportional to the total flow area of the oil drain ports 3412. The arrangement of the multiple oil drain ports 3412 significantly increases the total flow area, enabling the hydraulic oil to pass through the oil drain ports 3412 at a higher flow rate, quickly enter the return cavity, and then return to the fuel tank 1 through the oil return port 313, thereby significantly shortening the time for the hydraulic oil to flow from the third cavity 3411 into the return cavity, enabling the pressure relief and return assembly 34 to respond faster when the system pressure exceeds the limit, effectively reducing the system pressure peak value, and enhancing the operating safety of the equipment.

[0044] Refer to Figure 5 and Figure 9As shown: The reset switch structure 35 includes a movable top block 351 and a self-resetting component 352; the outer peripheral wall of the movable top block 351 abuts against the inner wall of the second cavity 321, and one end of the movable top block 351 is connected to the valve seat 343; the self-resetting component 352 is arranged at the closed end of the second cavity 321, and the self-resetting component 352 is used to provide a force towards the pressure relief and return component 34 to the movable top block 351.

[0045] Before the system starts or within the normal working pressure range, the self-resetting component 352 is in a pre-compressed state, applying a constant force towards the check valve 342 to the movable top block 351. This force is transmitted to the valve seat 343 through the movable top block 351, causing the valve seat 343 to tightly abut against the check valve 342, forming a sealed connection, effectively blocking the communication path between the oil inlet 312 and the third cavity 3411. At this time, even if hydraulic oil flows into the first cavity 311, it cannot enter the third cavity 3411 through the check valve 342, ensuring the stable establishment and maintenance of the system pressure. When the system oil pressure increases, the force generated by the hydraulic oil on the valve seat 343 gradually increases. As the oil pressure force exceeds the pre-tightening force of the self-resetting component 352 on the movable top block 351, the valve seat 343 separates from the check valve 342, and the check valve 342 opens. The hydraulic oil enters the third cavity 3411. At the same time, the valve seat 343 drives the movable top block 351 to move away from the check valve 342, squeezing the self-resetting component 352 to further compress it, and the reaction force exerted by the self-resetting component 352 on the movable top block 351 also increases. After the oil pressure decreases, the self-resetting component 352 pushes the movable top block 351 towards the check valve 342 until the valve seat 343 abuts tightly against the check valve 342, thereby realizing the automatic opening and closing of the valve seat 343 and the check valve 342 with the change of hydraulic pressure.

[0046] Refer to Figure 3 、 Figure 9 and Figure 10 As shown: The self-resetting component 352 includes a guide rod 3521 and an elastic member 3522; one end of the guide rod 3521 is connected to the body cover 32, and the axis of the guide rod 3521 extends vertically towards the first cavity 311, and the movable top block 351 is movably connected to the guide rod 3521; the elastic member 3522 is arranged between the movable top block 351 and the closed end of the second cavity 321, and the elastic member 3522 applies a force towards the first cavity 311 to the movable top block 351.

[0047] The guide rod 3521 guides the movement of the movable top block 351, which can ensure that the valve seat 343 at the front end of the movable top block 351 can be accurately docked with the check valve 342. The elastic member 3522 can be a component such as a spring that stores elastic potential energy. The elastic member 3522 is always in a compressed state. In the fit where the valve seat 343 is pressed against the check valve 342, the elastic member 3522 exerts a force on the movable top block 351 towards the check valve 342. When the hydraulic oil pushes the movable top block 351 to move along the guide rod 3521, the elastic member 3522 is compressed and stores elastic potential energy. After the oil pressure decreases, the elastic member 3522 releases the elastic potential energy to push the movable top block 351 to move along the guide rod 3521. Through the continuous preloading and automatic reset characteristics of the elastic member 3522, it is ensured that after the oil pressure drops, the movable top block 351 can push the valve seat 343 to dock with the check valve 342, and the reset action can be completed without an additional driving device.

[0048] Referring Figure 7 and Figure 11 as shown: The pressure-holding control structure 37 includes a travel switch 372 and a detection rod 371; the travel switch 372 is connected to the body cover 32; one end of the detection rod 371 extends into the interior of the body cover 32 and is connected to the movable top block 351, and the other end of the detection rod 371 is used to dock and cooperate with the travel switch 372.

[0049] When the valve seat 343 is completely separated from the check valve 342 and the hydraulic oil starts to relieve pressure through the pressure-relief and reflux assembly 34, the distance that the detection rod 371 moves is defined as the first stroke. During this process, the travel switch 372 continuously monitors the position change of the detection rod 371. As the hydraulic oil flows back to the fuel tank 1 and the system oil pressure drops, the elastic member 3522 releases the elastic potential energy to push the movable top block 351 to drive the valve seat 343 to reset towards the check valve 342. The detection rod 371 moves synchronously towards the travel switch 372 under the drive of the movable top block 351. The distance that the detection rod 371 moves is defined as the second stroke. The travel switch 372 detects the displacement of the detection rod 371 in real time. When the distance of the second stroke is equal to that of the first stroke, it indicates that the valve seat 343 has been tightly pressed against the check valve 342 again and the system reaches the pressure balance state. At this time, it is necessary to keep the air pressure in the independent cavity unchanged, so as to ensure that the pressure-holding monitoring structure 36 is accurately started when the system pressure reaches the balance.

[0050] The above embodiments only represent one or several implementation manners of the present invention, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. The hydraulic oil supply system of a large-scale processing device, comprising an oil tank (1), a power unit (2) and a pressure relief structure (3) respectively arranged at both ends of the oil tank (1), characterized in that, The pressure relief structure (3) includes an oil pressure part body (31) arranged at the upper end of the main body of the fuel tank (1). A first cavity (311) with an opening is arranged inside the oil pressure part body (31). The first cavity (311) is used for storing part of the oil. An oil inlet (312) and an oil return port (313) communicating with the first cavity (311) are arranged on the surface of the oil pressure part body (31). The oil return port (313) communicates with the fuel tank (1). One end of the oil pressure part body (31) is provided with a body cover (32), and the body cover (32) covers the opening end of the first cavity (311). An oil outlet valve (33) and a pressure relief and reflux assembly (34) are arranged inside the first cavity (311). The oil outlet valve (33) communicates with the oil inlet (312). The pressure relief and reflux assembly (34) is used for adjusting the oil pressure inside the first cavity (311). When the oil pressure inside the first cavity (311) is relatively high, the pressure relief and reflux assembly (34) is in an open state, and the oil return port (313) communicates with the first cavity (311). When the oil pressure inside the first cavity (311) is relatively low, the pressure relief and reflux assembly (34) is in a closed state, and the oil return port (313) is separated from the first cavity (311).

2. The hydraulic oil supply system of the large processing equipment according to claim 1, characterized in that A second cavity (321) communicating with the first cavity (311) is arranged inside the body cover (32). A reset switch structure (35) capable of converting oil pressure into auxiliary self - working is movably arranged inside the second cavity (321). The reset switch structure (35) automatically switches the state of the pressure relief and reflux assembly (34) according to the change of the oil pressure inside the first cavity (311).

3. The hydraulic oil supply system of the large-scale processing equipment according to claim 2, characterized in that, A pressure - adding port (322) and a pressure - relief port (323) are arranged on the side wall of the body cover (32). The reset switch structure (35) abuts against the inner wall of the second cavity (321) toward the closed end of the second cavity (321), forming an independent cavity. Both the pressure - adding port (322) and the pressure - relief port (323) communicate with the independent cavity.

4. The hydraulic oil supply system of the large-scale processing equipment according to claim 3, characterized in that, A pressure - maintaining monitoring structure (36) for monitoring the internal air pressure of the independent cavity is arranged beside the body cover (32). The pressure - maintaining monitoring structure (36) is connected to the pressure - adding port (322).

5. The hydraulic oil supply system of the large-scale processing equipment according to claim 3, characterized in that, A pressure - maintaining control structure (37) for controlling the pressure - maintaining monitoring structure (36) to stabilize the internal air pressure of the independent cavity is arranged on the outer wall of the body cover (32).

6. The hydraulic oil supply system of the large-scale processing equipment according to claim 1, characterized in that, The pressure relief and reflux assembly (34) includes a cylinder block (341) with a third cavity (3411) arranged inside, a check valve (342) and a valve seat (343). A reflux cavity is formed between the outer wall of the cylinder block (341) and the inner wall of the first cavity (311). The reflux cavity communicates with the oil return port (313), and an oil discharge port (3412) is arranged on the outer wall of the cylinder block (341). The check valve (342) communicates the oil inlet (312) and the third cavity (3411). The valve seat (343) is used for controlling the opening and closing of the check valve (342).

7. The hydraulic oil supply system of the large-scale processing equipment according to claim 6, characterized in that, There are multiple oil discharge ports (3412), and the multiple oil discharge ports (3412) are arranged at equal intervals on the outer wall of the cylinder block (341).

8. The hydraulic oil supply system of the large-scale processing equipment according to claim 2, characterized in that, The reset switch structure (35) includes a movable top block (351) and a self - reset component (352). The outer peripheral wall of the movable top block (351) is in tight contact with the inner wall of the second cavity (321), and one end of the movable top block (351) is connected to the valve seat (343); The self-resetting component (352) is arranged at the closed end of the second cavity (321), and the self-resetting component (352) is used to provide a force for the movable top block (351) towards the pressure relief and reflux component (34).

9. The hydraulic oil supply system of the large-scale processing equipment according to claim 8, characterized in that, The self-resetting component (352) includes a guide rod (3521) and an elastic member (3522); One end of the guide rod (3521) is connected to the body cover (32), and the axis of the guide rod (3521) extends perpendicularly towards the first cavity (311), and the movable top block (351) is movably connected to the guide rod (3521); The elastic member (3522) is arranged between the movable top block (351) and the closed end of the second cavity (321), and the elastic member (3522) exerts a force on the movable top block (351) towards the first cavity (311).

10. The hydraulic oil supply system of the large processing equipment according to claim 5, characterized in that, The pressure holding control structure (37) includes a travel switch (372) and a detection rod (371); The travel switch (372) is connected to the body cover (32); One end of the detection rod (371) extends into the interior of the body cover (32) and is connected to the movable top block (351), and the other end of the detection rod (371) is used for docking and cooperating with the travel switch (372).

Images