Graded pre-pressing flexible start-stop hydraulic oil supply system

Abstract

The invention discloses a graded pre-pressing flexible start-stop hydraulic oil supply system which comprises a composite hydraulic loop with a multi-stage pressure adjusting mechanism, the composite hydraulic loop comprises a first ball valve, a pressure measuring connector set, an emergency stop valve, a logic valve, a second throttling valve and a one-way valve, and the composite hydraulic loop is connected with an executing mechanism through a multi-way valve. The composite hydraulic loop provides a high-pressure oil liquid circulation path and an oil return oil liquid circulation path which have a graded throttling function, and is provided with a pressure impact suppression mechanism, so that a multi-stage pressure regulation mechanism is realized, and impact caused by sudden change of pipeline pressure is suppressed. In addition, a one-way valve for providing oil return back pressure is arranged on an oil return pipeline of the system, so that oil in a hydraulic actuator pipeline can be effectively prevented from being emptied during shutdown; meanwhile, isolation ball valves are designed at the two ends of the filter, oil leakage is eradicated, high-pressure oil is prevented from hurting people, and the operation safety of the people is guaranteed.

Description

Technical Field

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

[0002] The hydraulic system of floating drilling equipment usually uses a constant pressure hydraulic source to supply oil to multiple devices at the same time. 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 pressure oil. However, the traditional system has the following technical pain points: During the oil supply startup phase, the internal pipeline of the equipment produces pressure shock due to the drastic change in pressure, causing pipeline vibration and damage to hydraulic components; when the system is shut down, the oil returns to the tank, causing the actuator pipeline to be emptied, causing the hydraulic actuator to operate abnormally when it is restarted; there is a risk of pipeline oil leakage during the replacement of traditional filters, which not only pollutes the environment but may also cause personal injury due to high-pressure oil injection. Summary of the invention

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

[0004] To achieve the above-mentioned purpose, the present invention 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 including 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 includes 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, 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 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, 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, a pressure measuring joint is connected to the oil circuit node L, 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.

[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 the 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. The first throttle valve is arranged on the pipeline between the oil circuit node C and the G port. By setting the first throttle valve, the flow rate into the emergency stop valve is restricted to prevent the emergency stop valve from working with excessive flow rate.

[0007] In some embodiments, The filter is a high-pressure filter; The second throttle valve is a one-way throttle valve. By setting the second throttle valve, the flow rate into the emergency stop valve is restricted, which can not only prevent the emergency stop valve from working with excessive flow rate, but also slowly release the pressure in the pressure oil pipeline of the equipment.

[0008] In some embodiments, The filter is internally provided with a bypass check valve. When the filter is blocked, the bypass check valve automatically opens, and the oil fluid bypasses the filter element to avoid excessive pressure loss; The filter is provided with a transmitter. When the filter is blocked, the transmitter will send a prompt message for replacing 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 at the same time, oil leakage in the pipeline can be prevented.

[0009] In some embodiments, when the hierarchical preloading compliant start-stop hydraulic oil supply system supplies oil, The high-pressure oil fluid circulation path of the hierarchical preloading compliant start-stop hydraulic oil supply system is: high-pressure oil inlet P → first ball valve → filter → second ball valve → oil circuit node C. When the emergency stop valve changes direction, the G port communicates with the J port, and the K port communicates with the H port. The oil circuit node C is divided into a main oil circuit and a control oil circuit, where The main oil circuit directly leads from the oil circuit node C to the D port; The control oil circuit passes through the first throttle valve → G port → J port → oil circuit node L, and is divided into two paths through the oil circuit node L. One path goes to the F port to control the opening of the logic valve, and the other path goes through the second throttle valve to the 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 changes direction, and the D port communicates with the E port to supply oil to the pressure oil pipeline of the equipment; The return oil fluid circulation path of the hierarchical preloading compliant start-stop hydraulic oil supply system is: Y port → H port → K port → oil circuit node M → oil circuit node T → check valve. This path forms a controllable pressure relief channel through hierarchical throttling to realize the oil fluid at the F port returning to the oil return, ensuring the reliable commutation of the logic valve.

[0010] In some embodiments, When the hierarchical preloading compliant start-stop hydraulic oil supply system stops supplying oil, The high-pressure oil flow path of the hierarchical preloading compliant 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 a main oil circuit and a control oil circuit. The emergency stop valve is reset. Among them, The control oil circuit passes through the first throttle valve → port G → port H → port Y. At this time, the pressure in the control oil circuit and the spring in the logic valve form a resultant force to switch the spool of the logic valve to the closed position, blocking the passage between port D and port E and stopping the oil supply; The main oil circuit leads directly from the oil circuit node C to port D; The return oil flow path of the hierarchical preloading compliant start-stop hydraulic oil supply system is: oil circuit node N → second throttle valve → oil circuit node L → port J → port K → oil circuit node M → oil circuit node T → check valve → return oil port R. This path forms a controllable pressure relief channel through hierarchical throttling, realizing the oil return from the F port of the logic valve to the return oil, ensuring the reliable commutation of the logic valve, and at the same time releasing the pressure oil in the equipment pressure oil pipeline to the return oil.

[0011] In some embodiments, A pressure threshold is pre-established at the oil circuit node N. After the pressure at the oil circuit node N reaches the pressure threshold, the logic valve is triggered to commutate, conducting the passage between port D and port E, so that the main oil circuit supplies oil to the equipment pressure oil pipeline, and at the same time forming a hierarchical start mechanism of "preloading first, then main supply", effectively reducing the pressure mutation during the start and stop of the hydraulic system applying the hierarchical preloading compliant start-stop hydraulic oil supply system and reducing the impact damage of the pipeline; When the emergency stop valve is reset, the pressure in the control oil circuit and the spring in the logic valve form a resultant force to switch the spool of the logic valve to the closed position, blocking the passage from port D to port E and immediately stopping the oil supply.

[0012] In some embodiments, the hierarchical preloading compliant start-stop hydraulic oil supply system is further provided with an impact suppression mechanism, and the impact suppression mechanism is: When the emergency stop valve switches, port G is connected to port J, and port K is connected to port H. The oil is divided at the oil circuit node L: the first branch goes to port F, and the second branch passes through the second throttle valve to the oil circuit node N. When the pressure established at the oil circuit node N is greater than the spring threshold of port Y, the spool of the logic valve commutates, port D and port E are conducted, and at the same time port K and port H are conducted. The oil in the logic valve cavity returns oil through the emergency stop valve and the check valve, forming a dual-path oil supply mode of direct supply of the main oil circuit and cooperation of the preloading pipeline, realizing hierarchical pressure establishment and compliant start.

[0013] In some embodiments, when the actuator stops, the opening pressure of the check valve forms a back pressure in the main return pipeline, preventing the oil from flowing back and maintaining the load balance, effectively preventing the oil in the equipment pressure oil pipeline from being emptied.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: a multi-stage pressure regulation mechanism is formed to suppress the impact caused by sudden changes in pipeline pressure, realizing the establishment of hierarchical pressure and compliant start-up. In addition, it can avoid the emptying of the oil in the equipment pressure oil pipeline during shutdown. Moreover, through the ball valve design at both ends of the filter, oil leakage is prevented and high-pressure oil from hurting people is avoided, ensuring the safety of personnel operation and enhancing the safety and reliability during the application of the hierarchical preloading compliant start-stop hydraulic oil supply system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 FIG. is the hydraulic oil supply schematic diagram of the hierarchical preloading compliant start-stop hydraulic oil supply system in some embodiments of the present invention; Figure 2 FIG. is the return oil principle head diagram of the hierarchical preloading compliant start-stop hydraulic oil supply system in some embodiments of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0017] Please refer to Figure 1 to and Figure 2, The figure shows a preferred embodiment of the present invention, which discloses a hierarchical pre-pressure compliant 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 check valve 9. The composite hydraulic circuit is connected to an actuator 11 through a multi-way valve 10. The pressure measuring joint group 4 includes at least four pressure measuring joints, which are respectively a first pressure measuring joint 4.1, a second pressure measuring joint 4.2, a third pressure measuring joint 4.3 and a fourth pressure measuring joint 4.4. The emergency stop valve 6 is provided with ports G, H, K, and J, and the logic valve 7 is provided with ports D, F, E, and Y. The high-pressure oil inlet P is connected to port G through the first ball valve 1. There is an oil circuit node C on the pipeline between the first ball valve 1 and port G. There is a first pressure measuring joint 4.1 on the pipeline between the oil circuit node C and the first ball valve 1. The second ball valve 3 is arranged on the pipeline between the first pressure measuring joint 4.1 and the first ball valve 1, and the filter 2 is arranged between the first ball valve 1 and the second ball valve 3. There is a second pressure measuring joint 4.2 on the pipeline between the oil circuit node C and port G. The first throttle valve 5 is arranged on the pipeline from the oil circuit node C to port G. By setting the first throttle valve 5, the flow rate into the emergency stop valve 6 is restricted to prevent the emergency stop valve from working with excessive flow. The second pressure measuring joint 4.2 is connected to the pipeline between the first throttle valve 5 and the emergency stop valve 6. Port K is connected to the oil return port R through a check valve 9. There are an oil circuit node M close to port K and an oil circuit node T close to the check valve on the pipeline between port K and the check valve 9. There is a fourth pressure measuring joint 4.4 at the oil circuit node M. The oil circuit node T is connected to the equipment pressure oil pipeline. Port H is connected to port Y, and port J is connected to port F. There is an oil circuit node L on the pipeline between port J and port F. The oil circuit node L is connected to the third pressure measuring joint 4.3, and there is a second throttle valve 8 on the pipeline between the third pressure measuring joint 4.3 and the oil circuit node L. There is an oil circuit node N on the pipeline between the second throttle valve 8 and the third pressure measuring joint 4.3. There are pipelines connecting the oil circuit node N to the oil circuit node C and to the equipment pressure oil pipeline. The pipeline between the oil circuit node N and the oil circuit node C is connected to ports D and E. The filter 2 described herein is a high-pressure filter, and the second throttle valve 8 is a one-way throttle valve.

[0018] The above-mentioned filter 2 can be internally provided with a bypass check valve. When the filter 2 is blocked, the bypass check valve automatically opens, and the oil fluid bypasses the filter element of the filter 2 to flow to avoid excessive pressure loss.

[0019] A transmitter can also be added to the above-mentioned filter 2. When the filter is blocked, the transmitter will send a prompt message for replacing 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 at the same time, oil leakage in the pipeline can be prevented.

[0020] The above - mentioned check valve and transmitter are arranged to facilitate the maintenance of the hydraulic oil supply system with graded pre - pressure compliant start - stop.

[0021] A pressure threshold value (e.g., 2 MPa, which can also be set as required) is pre - established at the oil circuit node N.

[0022] Combined with Figure 2 As shown in the figure, when the hydraulic oil supply system with graded pre - pressure compliant start - stop supplies oil, The high - pressure oil flow path of the hydraulic oil supply system with graded pre - pressure compliant start - stop 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 changes its direction, the G port and the J port are connected, the K port and the H port are connected. The oil circuit node C is divided into a main oil circuit and a control oil circuit, where The control oil circuit passes through the first throttle valve 5 → G port → J port → oil circuit node L, and is divided into two paths after passing through the oil circuit node L; one path goes to the F port to control the opening of the logic valve 7, and one path passes through the second throttle valve 8 to the 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 changes its direction. At this time, the D port and the E port are conducted, and pressure oil is supplied to the equipment's pressure oil pipeline; The main oil circuit directly leads from the oil circuit node C to the D port, then through the D port → E port → oil circuit node N. After the pressure at the oil circuit node N reaches the pressure threshold value, the logic valve 7 is triggered to change its direction to switch to the open position, conducting the D port and the E port, so that the main oil circuit supplies oil to the equipment's pressure oil pipeline, and at the same time forms a graded start - up mechanism of "pre - pressure first, main supply later", effectively reducing the pressure mutation during the start - stop process of the hydraulic system applying the hydraulic oil supply system with graded pre - pressure compliant start - stop, and reducing the impact damage of the pipeline; The return oil flow path of the hydraulic oil supply system with graded pre - pressure compliant start - stop is: Y port → H port → K port → oil circuit node M → oil circuit node T → check valve 9. This path forms a controllable pressure - relief channel through graded throttling to realize the oil return from the F port, ensuring the reliable direction change of the logic valve 7.

[0023] Combined with Figure 1 As shown in the figure, when the hydraulic oil supply system with graded pre - pressure compliant start - stop stops supplying oil, the emergency stop valve 6 resets. The high - pressure oil flow path of the hydraulic oil supply system with graded pre - pressure compliant start - stop 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 a main oil circuit and a control oil circuit, where The control oil circuit passes through the first throttle valve 1 → G port → H port → Y port. At this time, the combined force of the pressure in the control oil circuit and the spring in the logic valve 7 causes the spool of the logic valve 7 to switch to the closed position, blocking the passage between the D port and the E port and stopping the oil supply; The main oil circuit directly leads from the oil circuit node C to the D port; The return oil flow path of the graded pre-pressure smooth 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 to realize the oil at port F of logic valve 7 to return oil, ensure the reliable switching of logic valve 7, and release the pressure oil in the equipment pressure oil pipeline to return oil.

[0024] The graded pre-pressure soft start-stop hydraulic oil supply system is also equipped with a shock suppression mechanism, which is: When the emergency stop valve 6 is switched, port G is connected to port J, 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 valve core of the logic valve 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 pre-pressure pipeline, realizing graded pressure establishment and smooth start-up.

[0025] When the actuator stops, the opening pressure of the one-way valve 9 forms a back pressure in the main return line, preventing the oil from flowing back and maintaining load balance, effectively preventing the oil in the equipment pressure oil line from being drained.

[0026] The logic valve mentioned above plays a reversing role, and the logic valve includes but is not limited to a logic valve using a return spring. Other existing valves that can play a reversing role can also be used. It can be directly implemented using existing devices or existing technologies, so it will not be described in detail here.

[0027] 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.

[0028] The above undisclosed matters can all be implemented using existing technologies, so they will not be elaborated here.

[0029] 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. indicate orientations or positional relationships 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 limitations on the present invention.

[0030] In the description of the present invention, it should also be noted that, unless otherwise clearly specified and defined, the terms "arranged", "installed", "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] The above content is a further detailed description of the present invention in combination with specific embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the art to which the present invention pertains, without departing from the concept of the present invention, several simple deductions or substitutions can still be made, and all should be regarded as falling within the protection scope determined by the claims submitted for the present invention.

Claims

1. A hierarchical preloading compliant start-stop hydraulic oil supply system, characterized in that, Comprising a composite hydraulic circuit with a multi-stage pressure regulation mechanism, the composite hydraulic circuit includes a first ball valve, a pressure measuring joint group, an emergency stop valve, a logic valve, a second throttle valve and a check valve. The composite hydraulic circuit is connected to an actuator through a multi-way valve. The pressure measuring joint group includes multiple pressure measuring joints. The emergency stop valve is provided with ports G, H, K, and J. The logic valve is provided with ports D, F, E, and Y. The high-pressure oil inlet P is connected to port G through the first ball valve. There is an oil circuit node C on the pipeline between the first ball valve and port G. There is a pressure measuring joint on the pipeline between the oil circuit node C and the first ball valve and on the pipeline between the oil circuit node C and port G respectively. Port K is connected to the oil return port R through a check valve. There are an oil circuit node M close to port K and an oil circuit node T close to the check valve on the pipeline between port K and the check valve. There is a pressure measuring joint 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. Port H is connected to port Y. Port J is connected to port F. There is an oil circuit node L on the pipeline between port J and port F. 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. There is an oil circuit node N on the pipeline between the second throttle valve and the pressure measuring joint.

2. The hierarchical preloading compliant start-stop hydraulic oil supply system according to claim 1, characterized in that, 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. 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.

3. The hierarchical preloading compliant start-stop hydraulic oil supply system according to claim 2, wherein, The composite hydraulic circuit further includes a first throttle valve, and the first throttle valve is arranged on the pipeline between the oil circuit node C and port G.

4. A stepwise preloading compliant start-stop hydraulic oil supply system according to claim 3, characterized in that The filter is a high-pressure filter; The second throttle valve is a one-way throttle valve.

5. A stepwise preloading compliant start-stop hydraulic oil supply system according to claim 4, characterized in that The filter is internally provided with a bypass check valve. When the filter is blocked, the bypass check valve automatically opens, and the oil bypasses the filter element to flow to avoid excessive pressure loss; The filter is provided with a transmitter. When the filter is blocked, the transmitter will send a prompt message for replacing the filter element.

6. A stepwise preloading compliant start-stop hydraulic oil supply system according to claim 4, characterized in that When the stepwise preloading compliant start-stop hydraulic oil supply system supplies oil, The high-pressure oil flow path of the stepwise preloading compliant 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 changes direction, port G is communicated with port J, port K is communicated with port H. The oil circuit node C is divided into a main oil circuit and a control oil circuit, where The main oil circuit directly leads from the oil circuit 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 through the oil circuit node L. One path goes to port F to control the opening of the logic valve, and one path passes through the second throttle valve to the 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 changes direction, and port D is conducted with port E to supply oil to the equipment pressure oil pipeline; The oil return fluid flow path of the hierarchical preloading compliant start-stop hydraulic oil supply system is: port Y → port H → port K → oil path node M → oil path node T → check valve. This path forms a controllable pressure relief channel through hierarchical throttling to realize the oil return from port F.

7. The hierarchical preloading compliant start-stop hydraulic oil supply system according to claim 6, wherein when the hierarchical preloading compliant start-stop hydraulic oil supply system stops supplying oil, the high-pressure oil fluid flow path of the hierarchical preloading compliant start-stop hydraulic oil supply system is: high-pressure oil inlet P → first ball valve → filter → second ball valve → oil path node C. Oil path node C is divided into a main oil path and a control oil path. The emergency stop valve is reset, where the control oil path passes through the first throttle valve → port G → port H → port Y. At this time, the pressure in the control oil path and the spring in the logic valve form a resultant force to switch the logic valve spool to the closed position, blocking the passage between port D and port E; the main oil path directly leads from oil path node C to port D; the oil return fluid flow path of the hierarchical preloading compliant start-stop hydraulic oil supply system is: oil path node N → second throttle valve → oil path node L → port J → port K → oil path node M → oil path node T → check valve → oil return port R. This path forms a controllable pressure relief channel through hierarchical throttling to realize the oil return from port F of the logic valve, and at the same time releases the pressure oil in the equipment pressure oil pipeline to the oil return.

8. The hierarchical preloading compliant start-stop hydraulic oil supply system according to claim 7, wherein a pressure threshold is pre-established at oil path node N. After the pressure at oil path node N reaches the pressure threshold, the logic valve is triggered to change its direction, conducting the passage between port D and port E so that the main oil path supplies oil to the equipment pressure oil pipeline; when the emergency stop valve is reset, the pressure in the control oil path and the spring in the logic valve form a resultant force to switch the spool of the logic valve to the closed position, blocking the passage from port D to port E and stopping the oil supply.

9. A hierarchical preloading compliant start-stop hydraulic oil supply system according to claim 8, wherein The hierarchical preloading compliant start-stop hydraulic oil supply system is also provided with an impact suppression mechanism, and the impact suppression mechanism is: when the emergency stop valve switches, port G is connected to port J, and port K is connected to port H. The oil fluid is branched at oil path node L: the first branch goes to port F, and the second branch passes through the second throttle valve to oil path node N. When the pressure established at oil path node N is greater than the spring threshold of port Y, the logic valve spool changes its direction, port D and port E are conducted, and at the same time port K and port H are conducted. The oil fluid in the logic valve cavity returns to the oil through the emergency stop valve and the check valve, forming a dual oil supply mode of direct supply of the main oil path and coordination of the preloading pipeline.

10. A hierarchical preloading compliant start-stop hydraulic oil supply system according to claim 9, characterized in that, When the actuator stops, the opening pressure of the check valve forms a back pressure in the main return pipeline to prevent the oil fluid from flowing back and maintain load balance.

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