A graded pre-pressure soft start-stop hydraulic oil supply system

Abstract

The present invention discloses a graded pre-pressure soft start-stop hydraulic oil supply system, comprising a composite hydraulic circuit with a multi-stage pressure regulating mechanism, the composite hydraulic circuit comprising a first ball valve, a pressure measuring joint group, an emergency stop valve, a logic valve, a second throttle valve and a one-way valve, the composite hydraulic circuit being connected to the actuator via a multi-way valve, the composite hydraulic circuit providing a high-pressure oil flow path and a return oil flow path with graded throttling functions, and being provided with a pressure shock suppression mechanism, realizing a multi-stage pressure regulating mechanism, and suppressing shocks caused by sudden changes in pipeline pressure. In addition, the system is provided with a one-way valve that provides return oil back pressure in the return oil pipeline, which can effectively prevent the oil in the hydraulic actuator pipeline from being emptied during shutdown; at the same time, isolation ball valves are designed at both ends of the filter to prevent oil leakage and prevent high-pressure oil from injuring people, thereby ensuring the safety of personnel operation.

Description

Technical Field

[0001] The present invention relates to the field of offshore oil drilling related equipment, in particular to a graded pre-pressurized flexible start-stop hydraulic oil supply system. Background Art

[0002] The hydraulic system of floating drilling rigs typically uses a constant-pressure hydraulic source to simultaneously supply oil to multiple devices. To ensure operational safety, each device's hydraulic system inlet is equipped with a separate oil supply control system to control the on / off state of the pressurized oil. However, traditional systems have the following technical pain points: During the oil supply startup phase, drastic pressure changes in the equipment's internal pipelines generate pressure shocks, causing pipeline vibration and damage to hydraulic components; when the system is shut down, oil returns to the tank, draining the actuator pipelines and causing abnormal operation when the hydraulic actuator is restarted; and during traditional filter replacement, there is a risk of pipeline oil leakage, which not only pollutes the environment but also may cause personal injury due to the injection of high-pressure oil. Summary of the Invention

[0003] The object of the present invention is to provide a graded pre-pressure flexible start-stop hydraulic oil supply system to solve one or more of the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the present invention discloses a graded pre-pressure soft start-stop hydraulic oil supply system, comprising a composite hydraulic circuit with a multi-stage pressure regulation mechanism, the composite hydraulic circuit comprising a first ball valve, a pressure measuring joint group, an emergency stop valve, a logic valve, a second throttle valve and a one-way valve, the composite hydraulic circuit is connected to the actuator through a multi-way valve, the pressure measuring joint group comprises a plurality of pressure measuring joints, the emergency stop valve is provided with a G port, an H port, a K port and a J port, the logic valve is provided with a D port, an F port, an E port and a Y port, the high-pressure oil inlet P is connected to the G port through the first ball valve, an oil circuit node C is provided on the pipeline between the first ball valve and the G port, and the oil circuit node C is connected to the first ball valve. A pressure measuring joint is respectively provided on the pipeline between the ports H and G, and on the pipeline between the oil circuit node C and the G port. The K port is connected to the oil return port R through a one-way valve. An oil circuit node M close to the K port and an oil circuit node T close to the one-way valve are provided on the pipeline between the K port and the one-way valve. A pressure measuring joint is provided at the oil circuit node M, one end of the oil circuit node T is connected to the oil return port of the multi-way valve, the H port is connected to the Y port, and the J port is connected to the F port. An oil circuit node L is provided on the pipeline between the J port and the F port, and a pressure measuring joint is connected to the oil circuit node L. A second throttle valve is provided on the pipeline between the pressure measuring joint and the oil circuit node L, and an oil circuit node N is provided on the pipeline between the second throttle valve and the pressure measuring joint.

[0005] In some embodiments, the composite hydraulic circuit includes a filter and a second ball valve, the pressure measuring joint on the pipeline between the oil circuit node C and the first ball valve is a first pressure measuring joint, the filter and the second ball valve are arranged on the pipeline between the first pressure measuring joint and the first ball valve, and the filter is arranged between the first ball valve and the second ball valve.

[0006] In some embodiments, the composite hydraulic circuit further includes a first throttle valve, which is arranged on the pipeline between the oil circuit node C and the G port. The setting of the first throttle valve limits the flow entering the emergency stop valve to prevent the emergency stop valve from operating with excess flow.

[0007] In some embodiments,

[0008] The filter is a high-pressure filter;

[0009] The second throttle valve is a one-way throttle valve. By setting the second throttle valve to limit the flow entering the emergency stop valve, it can prevent the emergency stop valve from operating in excess flow and slowly release the pressure in the equipment pressure oil pipeline.

[0010] In some embodiments,

[0011] The filter has a built-in bypass check valve. When the filter is clogged, the bypass check valve automatically opens, and the oil flows around the filter element to avoid excessive pressure loss.

[0012] The filter is provided with an indicator. When the filter is clogged, the indicator will issue a prompt message to replace the filter element. The filter can be isolated by closing the first ball valve and the second ball valve. After isolation, the filter element can be safely replaced and oil leakage in the pipeline can be prevented at the same time.

[0013] In some embodiments, when the graded pre-pressure soft start-stop hydraulic oil supply system supplies oil,

[0014] The high-pressure oil flow path of the graded pre-pressure soft start-stop hydraulic oil supply system is: high-pressure oil inlet P → first ball valve → filter → second ball valve → oil circuit node C, the emergency stop valve is reversed, G port is connected to J port, K ​​port is connected to H port, the oil circuit node C is divided into the main oil circuit and the control oil circuit, among which

[0015] The main oil route goes directly from oil route node C to port D;

[0016] The control oil circuit passes through the first throttle valve → port G → port J → oil circuit node L, and is divided into two paths at oil circuit node L. One path goes to port F to control the logic valve to open, and the other path goes through the second throttle valve to oil circuit node N. When the pressure of the control oil circuit is greater than the pressure of the spring in the logic valve, the logic valve switches direction, and ports D and E are connected, supplying oil to the equipment pressure oil pipeline;

[0017] The return oil flow path of the graded pre-pressure soft start-stop hydraulic oil supply system is: Y port → H port → K port → oil circuit node M → oil circuit node T → one-way valve. This path forms a controllable pressure relief channel through graded throttling, allowing the oil at port F to return to the oil, ensuring reliable switching of the logic valve.

[0018] In some embodiments,

[0019] When the graded pre-pressing soft start-stop hydraulic oil supply system stops supplying oil,

[0020] The high-pressure oil flow path of the graded pre-pressure soft start-stop hydraulic oil supply system is: high-pressure oil inlet P → first ball valve → filter → second ball valve → oil circuit node C. The oil circuit node C is divided into the main oil circuit and the control oil circuit. The emergency stop valve is reset.

[0021] The control oil circuit passes through the first throttle valve → G port → H port → Y port. At this time, the pressure of the control oil circuit and the spring in the logic valve form a combined force to switch the logic valve spool to the closed position, blocking the passage between D port and E port and stopping the oil supply.

[0022] The main oil route goes directly from oil route node C to port D;

[0023] The return oil flow path of the graded pre-pressure soft start-stop hydraulic oil supply system is: oil circuit node N → second throttle valve → oil circuit node L → J port → K port → oil circuit node M → oil circuit node T → check valve → return oil port R. This path forms a controllable pressure relief channel through graded throttling, allowing the oil at port F of the logic valve to return oil, ensuring reliable switching of the logic valve, and at the same time releasing the pressurized oil in the equipment's pressure oil pipeline to the return oil.

[0024] In some embodiments,

[0025] A pressure threshold is pre-established at the oil circuit node N. When the pressure at the oil circuit node N reaches the pressure threshold, the logic valve is triggered to switch, connecting ports D and E so that the main oil circuit can supply oil to the equipment pressure oil pipeline. At the same time, a "pre-pressure first, then main supply" graded starting mechanism is formed, effectively reducing the sudden pressure change during the start-stop process of the hydraulic system using the graded pre-pressure soft start-stop hydraulic oil supply system, and reducing pipeline impact damage;

[0026] When the emergency stop valve is reset, the pressure of the control oil circuit and the spring in the logic valve form a combined force to switch the valve core of the logic valve to the closed position, blocking the passage from port D to port E and immediately stopping the oil supply.

[0027] In some embodiments, the graded pre-loaded flexible start-stop hydraulic oil supply system is further provided with a shock suppression mechanism, which is:

[0028] When the emergency stop valve is switched, port G is connected to port J, and port K is connected to port H, and the oil is diverted at the oil circuit node L: the first branch goes to port F, and the second branch goes to the oil circuit node N through the second throttle valve. When the pressure established at the oil circuit node N is greater than the spring threshold of port Y, the logic valve spool is reversed, port D is connected to port E, and port K is connected to port H at the same time. The oil in the logic valve cavity returns through the emergency stop valve and the one-way valve, forming a dual-way oil supply mode of direct supply from the main oil circuit and coordinated with the pre-pressure pipeline, realizing graded pressure establishment and smooth start-up.

[0029] In some embodiments, when the actuator is shut down, the opening pressure of the one-way valve forms a back pressure in the main return line, preventing oil from flowing back and maintaining load balance, effectively preventing the oil in the equipment pressure oil line from being drained.

[0030] Compared with the prior art, the beneficial effects of the present invention are: forming a multi-stage pressure regulation mechanism, suppressing the impact caused by sudden changes in pipeline pressure, realizing the establishment of graded pressure and smooth start-up, and also preventing the oil in the equipment pressure oil pipeline from being emptied during shutdown. In addition, through the ball valve design at both ends of the filter, oil leakage is prevented and high-pressure oil is avoided to injure people, thereby ensuring the safety of personnel operation and improving the safety and reliability of the graded pre-pressure and smooth start-stop hydraulic oil supply system during application. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the hydraulic principle of the oil supply in the graded pre-pressure flexible start-stop hydraulic oil supply system in some embodiments of the present invention;

[0032] Figure 2 This is a diagram showing the oil return principle of a graded pre-pressurized flexible start-stop hydraulic oil supply system in some embodiments of the present invention. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] See also Figure 1 Zhihe Figure 2The figure shows a preferred embodiment of the present invention, which discloses a graded pre-pressure soft start-stop hydraulic oil supply system, including a composite hydraulic circuit with a multi-stage pressure regulation mechanism, the composite hydraulic circuit includes a first ball valve 1, a filter 2, a second ball valve 3, a pressure measuring joint group 4, a first throttle valve 5, an emergency stop valve 6, a logic valve 7, a second throttle valve 8 and a one-way valve 9, the composite hydraulic circuit is connected to the actuator 11 through a multi-way valve 10, the pressure measuring joint group 4 includes at least four pressure measuring joints, the four pressure measuring joints are a first pressure measuring joint 4.1, a second pressure measuring joint 4.2, The third pressure measuring joint 4.3 and the fourth pressure measuring joint 4.4 are provided with ports G, H, K, and J on the emergency stop valve 6, and ports D, F, E, and Y on the logic valve 7. The high-pressure oil inlet P is connected to the port G through the first ball valve 1. An oil circuit node C is provided on the pipeline between the first ball valve 1 and the port G. A first pressure measuring joint 4.1 is provided on the pipeline between the oil circuit node C and the first ball valve 1. The second ball valve 3 is provided on the pipeline between the first pressure measuring joint 4.1 and the first ball valve 1, and the filter 2 is provided between the first ball valve 1 and the second ball valve 3. The oil circuit node C is provided on the pipeline between the first pressure measuring joint 4.1 and the first ball valve 1. A second pressure measuring joint 4.2 is provided on the pipeline between the oil circuit node C and the G port. The first throttle valve 5 is provided on the pipeline between the oil circuit node C and the G port. The flow entering the emergency stop valve 6 is limited by the setting of the first throttle valve 5 to prevent the emergency stop valve from operating in excess of the flow rate. The second pressure measuring joint 4.2 is connected to the pipeline between the first throttle valve 5 and the emergency stop valve 6. The K port is connected to the oil return port R through a one-way valve 9. An oil circuit node M close to the K port and an oil circuit node T close to the one-way valve are provided on the pipeline between the K port and the one-way valve 9. A fourth pressure measuring joint 4.4 is provided at the oil circuit node M. Point T is connected to the equipment pressure oil pipeline, port H is connected to port Y, and port J is connected to port F. A pipeline node L is located on the pipeline between ports J and F. This node L is connected to third pressure-testing joint 4.3. A second throttle valve 8 is located on the pipeline between third pressure-testing joint 4.3 and node L. A pipeline node N is located on the pipeline between second throttle valve 8 and third pressure-testing joint 4.3. Node N is connected to node C and to the equipment pressure oil pipeline. The pipeline between node N and node C is connected to ports D and E. Filter 2 is a high-pressure filter, and second throttle valve 8 is a one-way throttle valve.

[0035] The filter 2 may have a built-in bypass check valve. When the filter 2 is clogged, the bypass check valve automatically opens, and the oil flows around the filter element of the filter 2 to avoid excessive pressure loss.

[0036] An indicator can also be added to the above-mentioned filter 2. When the filter is clogged, the indicator will issue a reminder message to replace the filter element. The filter 2 can be isolated by closing the first ball valve 1 and the second ball valve 3. After isolation, the filter element can be safely replaced and oil leakage in the pipeline can be prevented at the same time.

[0037] The arrangement of the one-way valve and the signal transmitter facilitates the maintenance of the graded pre-pressurized smooth start-stop hydraulic oil supply system.

[0038] A pressure threshold is pre-established at the oil circuit node N (e.g. 2 MPa, which can also be set as required).

[0039] Combine Figure 2 The content shown is that when the graded pre-pressing soft start-stop hydraulic oil supply system supplies oil,

[0040] The high-pressure oil flow path of the graded pre-pressure soft start-stop hydraulic oil supply system is: high-pressure oil inlet P → first ball valve 1 → filter 2 → second ball valve 3 → oil circuit node C. At this time, the emergency stop valve 6 is reversed, G port and J port are connected, K port and H port are connected, and the oil circuit node C is divided into the main oil circuit and the control oil circuit.

[0041] The control oil circuit passes through the first throttle valve 5 → port G → port J → oil circuit node L, and is divided into two paths at oil circuit node L: one path to port F to control the logic valve 7 to open, and the other path passes through the second throttle valve 8 to oil circuit node N. When the pressure in the control oil circuit is greater than the pressure of the spring in the logic valve 7, the logic valve 7 switches direction, and ports D and E are connected, supplying oil to the equipment pressure oil pipeline.

[0042] The main oil route goes directly from oil route node C to port D, and then through port D → port E → oil route node N. When the pressure at oil route node N reaches the pressure threshold, logic valve 7 is triggered to switch to the open position, connecting ports D and E, so that the main oil route can supply oil to the equipment pressure oil pipeline. At the same time, a "pre-pressurization first, then main supply" graded starting mechanism is formed, effectively reducing the sudden pressure change during the start-stop process of the hydraulic system using the graded pre-pressurization soft start-stop hydraulic oil supply system, and reducing pipeline impact damage;

[0043] The return oil flow path of the graded pre-pressure soft start-stop hydraulic oil supply system is: Y port → H port → K port → oil circuit node M → oil circuit node T → one-way valve 9. This path forms a controllable pressure relief channel through graded throttling, realizing the oil from F port to return oil, ensuring reliable switching of logic valve 7.

[0044] Combine Figure 1 The content shown is that when the graded pre-pressed soft start-stop hydraulic oil supply system stops supplying oil, the emergency stop valve 6 is reset.

[0045] The high-pressure oil flow path of the graded pre-pressure soft start-stop hydraulic oil supply system is: high-pressure oil inlet P → first ball valve 1 → filter 2 → second ball valve 3 → oil circuit node C. The oil circuit node C is divided into the main oil circuit and the control oil circuit.

[0046] The control oil circuit passes through the first throttle valve 1 → G port → H port → Y port. At this time, the pressure of the control oil circuit and the spring in the logic valve 7 form a combined force to switch the valve core of the logic valve 7 to the closed position, blocking the passage between D port and E port, and stopping the oil supply;

[0047] The main oil route goes directly from oil route node C to port D;

[0048] The return oil flow path of the graded pre-pressure soft start-stop hydraulic oil supply system is: oil circuit node N → second throttle valve 8 → oil circuit node L → J port → K port → oil circuit node M → oil circuit node T → check valve 9 → return oil port R. This path forms a controllable pressure relief channel through graded throttling, realizing the oil from port F of logic valve 7 to return oil, ensuring reliable reversing of logic valve 7, and at the same time releasing the pressurized oil in the equipment pressure oil pipeline to return oil.

[0049] The graded pre-loaded soft start-stop hydraulic oil supply system also has a shock suppression mechanism, which is as follows:

[0050] When the emergency stop valve 6 is switched, port G is connected to port J, and port K is connected to port H, and the oil is split at the oil circuit node L: the first branch goes to port F, and the second branch goes to the oil circuit node N through the second throttle valve 8. When the pressure established at the oil circuit node N is greater than the spring threshold of port Y (such as 2MPa), the logic valve spool is reversed, port D is connected to port E, and port K is connected to port H at the same time. The oil in the logic valve cavity returns to the oil through the emergency stop valve and the one-way valve, forming a dual-path oil supply mode of direct supply from the main oil circuit and coordinated with the pre-pressure pipeline, realizing graded pressure establishment and smooth start-up.

[0051] When the actuator stops, the opening pressure of the one-way valve 9 forms the back pressure of the main return line, which prevents the oil from flowing back and maintains the load balance, effectively preventing the oil in the equipment pressure oil line from being drained.

[0052] The logic valve described above serves a reversing function, including but not limited to logic valves using return springs. Other existing valves capable of reversing functions may also be used. These can be directly implemented using existing devices or existing technologies, and therefore will not be described in detail here.

[0053] The pressure oil pipeline of the above-mentioned equipment can be the pressure oil pipeline of the multi-way valve or other existing pressure oil pipelines, and the actuator 11 can also select an existing hydraulically controlled device according to needs, so it will not be described here in detail.

[0054] The above undisclosed matters can all be implemented using existing technologies and are therefore not described in detail here.

[0055] Finally, it should be noted that in the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limiting the present invention.

[0056] In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "setting", "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be a connection between the internal parts of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0057] The above content is a further detailed description of the present invention in conjunction with specific implementation methods. It cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, they can make several simple deductions or substitutions without departing from the concept of the present invention, which should be regarded as falling within the scope of protection determined by the claims submitted for the present invention.

Claims

1. A graded pre-loaded soft start-stop hydraulic oil supply system, characterized in that: The invention comprises a composite hydraulic circuit with a multi-stage pressure regulating mechanism, wherein the composite hydraulic circuit comprises a first ball valve, a pressure measuring joint group, an emergency stop valve, a logic valve, a second throttle valve and a one-way valve. The composite hydraulic circuit is connected to the actuator through a multi-way valve. The pressure measuring joint group comprises a plurality of pressure measuring joints. The emergency stop valve is provided with a G port, an H port, a K port and a J port. The logic valve is provided with a D port, a F port, an E port and a Y port. The high-pressure oil inlet P is connected to the G port through the first ball valve. An oil circuit node C is provided on the pipeline between the first ball valve and the G port. The pipeline between the oil circuit node C and the first ball valve and between the oil circuit node C and the G port are connected. A pressure measuring joint is respectively provided on the pipeline, the K port is connected to the oil return port R through a one-way valve, an oil circuit node M close to the K port side and an oil circuit node T close to the one-way valve side are provided on the pipeline between the K port and the one-way valve, a pressure measuring joint is provided at the oil circuit node M, one end of the oil circuit node T is connected to the oil return port of the multi-way valve, the H port is connected to the Y port, the J port is connected to the F port, an oil circuit node L is provided on the pipeline between the J port and the F port, the oil circuit node L is connected to a pressure measuring joint, and a second throttle valve is provided on the pipeline between the pressure measuring joint and the oil circuit node L, and an oil circuit node N is provided on the pipeline between the second throttle valve and the pressure measuring joint; The composite hydraulic circuit includes a filter and a second ball valve, the pressure measuring joint on the pipeline between the oil circuit node C and the first ball valve is the first pressure measuring joint, and the filter and the second ball valve are arranged on the pipeline between the first pressure measuring joint and the first ball valve; The composite hydraulic circuit further includes a first throttle valve, which is arranged on the pipeline between the oil circuit node C and the G port; When the graded pre-pressing soft start-stop hydraulic oil supply system supplies oil, The high-pressure oil flow path of the graded pre-pressure soft start-stop hydraulic oil supply system is: high-pressure oil inlet P → first ball valve → filter → second ball valve → oil circuit node C, the emergency stop valve is reversed, G port is connected to J port, K ​​port is connected to H port, the oil circuit node C is divided into the main oil circuit and the control oil circuit, among which The main oil route goes directly from oil route node C to port D; The control oil circuit passes through the first throttle valve → port G → port J → oil circuit node L, and is divided into two paths at oil circuit node L. One path goes to port F to control the logic valve to open, and the other path goes through the second throttle valve to oil circuit node N. When the pressure of the control oil circuit is greater than the pressure of the spring in the logic valve, the logic valve switches direction, and ports D and E are connected, supplying oil to the equipment pressure oil pipeline; The return oil flow path of the graded pre-pressure soft start-stop hydraulic oil supply system is: Y port → H port → K port → oil circuit node M → oil circuit node T → one-way valve. This path forms a controllable pressure relief channel through graded throttling to realize the return oil of the oil at port F.

2. A graded pre-loaded flexible start-stop hydraulic oil supply system according to claim 1, characterized in that: The filter is arranged between the first ball valve and the second ball valve.

3. The hierarchical pre-loaded flexible start-stop hydraulic oil supply system according to claim 1, characterized in that: The filter is a high-pressure filter; The second throttle valve is a one-way throttle valve.

4. A graded pre-loaded flexible start-stop hydraulic oil supply system according to claim 3, characterized in that: The filter has a built-in bypass check valve. When the filter is clogged, the bypass check valve automatically opens, and the oil flows around the filter element to avoid excessive pressure loss. The filter is provided with an indicator, which will send out a prompt message to replace the filter element when the filter is clogged.

5. The graded pre-loaded flexible start-stop hydraulic oil supply system according to claim 3 is characterized in that: When the graded pre-pressing soft start-stop hydraulic oil supply system stops supplying oil, The high-pressure oil flow path of the graded pre-pressure soft start-stop hydraulic oil supply system is: high-pressure oil inlet P → first ball valve → filter → second ball valve → oil circuit node C. The oil circuit node C is divided into the main oil circuit and the control oil circuit. The emergency stop valve is reset. The control oil circuit passes through the first throttle valve → G port → H port → Y port. At this time, the pressure of the control oil circuit and the spring in the logic valve form a combined force to switch the logic valve spool to the closed position, blocking the passage between D port and E port. The main oil route goes directly from oil route node C to port D; The return oil flow path of the graded pre-pressure soft start-stop hydraulic oil supply system is: oil circuit node N → second throttle valve → oil circuit node L → J port → K port → oil circuit node M → oil circuit node T → check valve → return oil port R. This path forms a controllable pressure relief channel through graded throttling, allowing the oil at the F port of the logic valve to return oil, and at the same time releasing the pressure oil in the equipment pressure oil pipeline to return oil.

6. A graded pre-loaded flexible start-stop hydraulic oil supply system according to claim 5, characterized in that: A pressure threshold is pre-established at the oil circuit node N. When the pressure at the oil circuit node N reaches the pressure threshold, the logic valve is triggered to switch, connecting port D and port E, so that the main oil circuit can supply oil to the equipment pressure oil pipeline. When the emergency stop valve is reset, the pressure of the control oil circuit and the spring in the logic valve form a combined force to switch the valve core of the logic valve to the closed position, blocking the passage from port D to port E and stopping the oil supply.

7. The graded pre-loaded flexible start-stop hydraulic oil supply system according to claim 6, characterized in that: The graded pre-loaded flexible start-stop hydraulic oil supply system is also provided with a shock suppression mechanism, which is: When the emergency stop valve is switched, port G is connected to port J, and port K is connected to port H, and the oil is diverted at the oil circuit node L: the first branch goes to port F, and the second branch goes to the oil circuit node N through the second throttle valve. When the pressure at the oil circuit node N is greater than the spring threshold of port Y, the logic valve spool is reversed, port D is connected to port E, and port K is connected to port H at the same time. The oil in the logic valve cavity returns through the emergency stop valve and the one-way valve, forming a dual-way oil supply mode with direct supply from the main oil circuit and coordinated pre-pressure pipeline.

8. The graded pre-loaded flexible start-stop hydraulic oil supply system according to claim 7, characterized in that: When the actuator stops, the opening pressure of the one-way valve forms the back pressure of the main return line, preventing the oil from flowing back and maintaining load balance.

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