A shield tunneling machine and a propelling oil cylinder supporting hydraulic system thereof

Abstract

The application discloses a shield machine and a propelling oil cylinder supporting hydraulic system thereof, and belongs to the technical field of hydraulic control, which comprises a hydraulic pump, an oil tank and a pressure reducing valve, the oil inlet of the hydraulic pump is connected with the oil tank, the oil inlet of the pressure reducing valve is connected with the oil outlet of the hydraulic pump, the oil outlets of the pressure reducing valve are respectively connected with the rodless cavities of each supporting oil cylinder, and the pressure reducing valve is used for adjusting the oil pressure flowing to the rodless cavities of each supporting oil cylinder. The shield machine and the propelling oil cylinder supporting hydraulic system thereof provided by the application can realize the adjustment of the oil supply pressure of the rodless cavities through the pressure reducing valve in the propelling mode and the segment assembling mode, the supporting oil cylinder is extended in the low pressure mode in the propelling mode, and the supporting oil cylinder is extended in the high pressure mode in the segment assembling mode. In addition, a first overflow valve can be connected between the third oil port of the second reversing valve and the oil tank, and the first overflow valve can prevent the propelling oil cylinder from pressing the supporting oil cylinder back when the machine is stopped.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydraulic control, more particularly, to a shield machine and a propelling oil cylinder supporting hydraulic system thereof. BACKGROUND

[0002] The shield machine method construction has been increasingly widely applied in the tunnel engineering construction in the fields of urban rail transit, railway, highway, municipal infrastructure equipment and the like due to its safety and high efficiency. The propelling oil cylinder is a key component of the shield machine, and the propulsion, attitude adjustment and segment installation of the whole shield machine are performed through the propelling oil cylinder or are realized under the cooperation of the propelling oil cylinder.

[0003] In order to ensure that the axis of the propelling oil cylinder is parallel to the shield axis and coincides with the center line of the segment side edge, a protection device can be arranged for the propelling oil cylinder, such as a plurality of supporting oil cylinders are used to push the propelling oil cylinder, so as to protect the propelling oil cylinder from lateral force and avoid damage.

[0004] The shield machine has different requirements for the supporting oil cylinder in different working modes, however, the setting mode of the conventional supporting oil cylinder cannot meet the above requirements.

[0005] In summary, how to effectively solve the problem that the control of the supporting oil cylinder cannot meet the different working modes of the shield machine is a problem to be solved by the technical personnel in the field at present. SUMMARY

[0006] Therefore, the purpose of the present application is to provide a shield machine and a propelling oil cylinder supporting hydraulic system thereof, and the structural design of the shield machine and the propelling oil cylinder supporting hydraulic system thereof can effectively solve the problem that the control of the supporting oil cylinder cannot meet the different working modes of the shield machine.

[0007] In order to achieve the above purpose, the present application provides the following technical scheme:

[0008] A propelling oil cylinder supporting hydraulic system of a shield machine is used for controlling supporting oil cylinders supporting propelling oil cylinders, and comprises a hydraulic pump, an oil tank and a pressure reducing valve. The oil inlet of the hydraulic pump is connected with the oil tank, the oil inlet of the pressure reducing valve is connected with the oil outlet of the hydraulic pump, the oil outlets of the pressure reducing valve are respectively connected with the rodless cavities of the supporting oil cylinders, and the pressure reducing valve is used for adjusting the oil pressure flowing to the rodless cavities of the supporting oil cylinders.

[0009] Optionally, the propulsion cylinder supporting hydraulic system further comprises a first reversing valve, the pressure reducing valve comprises a first pressure reducing valve and a second pressure reducing valve, the oil inlet of the first pressure reducing valve and the oil inlet of the second pressure reducing valve are connected with the oil outlet of the hydraulic pump respectively, the first working oil port of the first reversing valve is connected with the oil outlet of the second pressure reducing valve, the second working oil port of the first reversing valve is connected with the rodless cavity of each supporting cylinder, the third working oil port of the first reversing valve is connected with the oil outlet of the first pressure reducing valve, when the first reversing valve is in the first position, the second working oil port of the first reversing valve is in communication with the third working oil port, when the first reversing valve is in the second position, the second working oil port of the first reversing valve is in communication with the first working oil port, and the pressure of the oil outlet of the first pressure reducing valve is less than the pressure of the oil outlet of the second pressure reducing valve.

[0010] Optionally, the propulsion cylinder supporting hydraulic system further comprises a second reversing valve, the first working oil port of the second reversing valve is connected with the second working oil port of the first reversing valve, the second working oil port of the second reversing valve is connected with the rodless cavity of each supporting cylinder, and the third working oil port of the second reversing valve is connected with the oil tank, when the second reversing valve is in the first position, the second working oil port of the second reversing valve is in communication with the third working oil port, and when the second reversing valve is in the second position, the second working oil port of the second reversing valve is in communication with the first working oil port.

[0011] Optionally, the propulsion cylinder supporting hydraulic system further comprises a second reversing valve, the first working oil port of the second reversing valve is connected with the second working oil port of the first reversing valve, the second working oil port of the second reversing valve is connected with the rodless cavity of each supporting cylinder, and the third working oil port of the second reversing valve is connected with the oil tank, when the second reversing valve is in the first position, the second working oil port of the second reversing valve is in communication with the third working oil port, and when the second reversing valve is in the second position, the second working oil port of the second reversing valve is in communication with the first working oil port.

[0012] Optionally, the propulsion cylinder supporting hydraulic system further comprises a second reversing valve, the first working oil port of the second reversing valve is connected with the second working oil port of the first reversing valve, the second working oil port of the second reversing valve is connected with the rodless cavity of each supporting cylinder, and the third working oil port of the second reversing valve is connected with the oil tank, when the second reversing valve is in the first position, the second working oil port of the second reversing valve is in communication with the third working oil port, and when the second reversing valve is in the second position, the second working oil port of the second reversing valve is in communication with the first working oil port.

[0013] Optionally, the propulsion cylinder supporting hydraulic system further comprises a second reversing valve, the first working oil port of the second reversing valve is connected with the second working oil port of the first reversing valve, the second working oil port of the second reversing valve is connected with the rodless cavity of each supporting cylinder, and the third working oil port of the second reversing valve is connected with the oil tank, when the second reversing valve is in the first position, the second working oil port of the second reversing valve is in communication with the third working oil port, and when the second reversing valve is in the second position, the second working oil port of the second reversing valve is in communication with the first working oil port.

[0014] Optionally, the propulsion cylinder supporting hydraulic system further comprises a second reversing valve, the first working oil port of the second reversing valve is connected with the second working oil port of the first reversing valve, the second working oil port of the second reversing valve is connected with the rodless cavity of each supporting cylinder, and the third working oil port of the second reversing valve is connected with the oil tank, when the second reversing valve is in the first position, the second working oil port of the second reversing valve is in communication with the third working oil port, and when the second reversing valve is in the second position, the second working oil port of the second reversing valve is in communication with the first working oil port.

[0015] Optionally, in the above-mentioned propulsion oil cylinder supporting hydraulic system, the pressure reducing valve is a proportional pressure reducing valve, and the outlet pressure of the proportional pressure reducing valve is adjustable.

[0016] Optionally, in the above-mentioned propulsion oil cylinder supporting hydraulic system, a reversing valve is further included, a first working oil port of the reversing valve is connected with an outlet of the proportional pressure reducing valve, a second working oil port of the reversing valve is connected with a rodless chamber of each supporting oil cylinder, and a third working oil port of the reversing valve is connected with the oil tank.

[0017] The propulsion oil cylinder supporting hydraulic system provided by the application comprises a hydraulic pump, an oil tank and a pressure reducing valve. The inlet of the hydraulic pump is connected with the oil tank, and the outlet of the hydraulic pump is connected with the inlet of the pressure reducing valve. The outlet of the pressure reducing valve is connected with the rodless chamber of each supporting oil cylinder, and the pressure reducing valve is used to adjust the oil pressure flowing to the rodless chamber of each supporting oil cylinder.

[0018] In the propulsion mode of the shield machine, the supporting oil cylinder can float with the deflection of the propulsion oil cylinder to protect the propulsion oil cylinder. In the segment assembling mode, the propulsion oil cylinder needs to be fixed, so the propulsion oil cylinder needs high pressure support, and the supporting oil cylinder is pressed in the circumferential direction to protect the propulsion oil cylinder. Therefore, in the propulsion mode and the segment assembling mode, the oil supply pressure of the rodless chamber is adjusted by the pressure reducing valve to extend the supporting oil cylinder in the low pressure mode in the propulsion mode and extend the supporting oil cylinder in the high pressure mode in the segment assembling mode. In summary, the propulsion oil cylinder supporting hydraulic system is used to realize the action of the supporting oil cylinder in different modes of the shield machine to meet the different pressure requirements of the supporting oil cylinder in different modes of the shield machine.

[0019] In a preferred embodiment, the propulsion oil cylinder supporting hydraulic system comprises a first reversing valve, and the pressure reducing valve comprises a first pressure reducing valve and a second pressure reducing valve. In the propulsion mode, the first reversing valve is placed in the first position, the second working oil port of the first reversing valve is connected with the third working oil port of the first reversing valve, and the hydraulic oil in the oil tank enters the rodless chamber of the supporting oil cylinder through the hydraulic pump, the first pressure reducing valve and the third working oil port to the second working oil port of the first reversing valve, and the supporting oil cylinder extends in the low pressure mode.

[0020] In the pipe segment assembling mode, the first reversing valve is placed in the second position, the second working oil port of the first reversing valve is communicated with the first working oil port of the first reversing valve, then the hydraulic oil in the oil tank enters the rodless cavity of the support oil cylinder through the hydraulic pump, the second pressure reducing valve and the channel from the first working oil port to the second working oil port of the first reversing valve, and the support oil cylinder is extended in the high pressure mode.

[0021] In another embodiment, the pressure reducing valve is a proportional pressure reducing valve, and the outlet oil port pressure of the proportional pressure reducing valve is adjustable. Then in the shield machine advancing mode or the pipe segment assembling mode, the hydraulic oil in the oil tank enters the rodless cavity of the support oil cylinder through the hydraulic pump and the proportional pressure reducing valve, and the pressure of the rodless cavity of the support oil cylinder can be adjusted by adjusting the outlet oil port pressure of the proportional pressure reducing valve, so that the action of the support oil cylinder in different modes of the shield machine is realized.

[0022] In order to achieve the above-mentioned purpose, the application further provides a shield machine comprising any one of the above-mentioned support hydraulic systems of the advancing oil cylinder. Since the support hydraulic system of the advancing oil cylinder has the above-mentioned technical effects, the shield machine with the support hydraulic system of the advancing oil cylinder should also have corresponding technical effects. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort.

[0024] Figure 1 The structure diagram of the support hydraulic system of the advancing oil cylinder of the shield machine of one specific embodiment of the present application.

[0025] The marks in the drawings are as follows:

[0026] Motor 1, coupling 2, hydraulic pump 3, second overflow valve 4, second check valve 5, first overflow valve 6, first pressure reducing valve 7, second pressure reducing valve 8, first reversing valve 9, second reversing valve 10, electromagnetic ball valve 11, first check valve 12, support oil cylinder 13, oil tank 14. DETAILED DESCRIPTION

[0027] The embodiments of the present application disclose a shield machine and a support hydraulic system of an advancing oil cylinder thereof, so as to realize the action of the support oil cylinder in different modes of the shield machine.

[0028] With reference to the accompanying drawings, the technical solutions in the embodiments of the present application will be clearly and completely described below, obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the present application.

[0029] The prop oil cylinder supporting hydraulic system provided by the present application comprises a hydraulic pump, an oil tank and a pressure reducing valve. The oil inlet of the hydraulic pump is connected with the oil tank, and the oil outlet of the hydraulic pump is connected with the oil inlet of the pressure reducing valve. The oil outlet of the pressure reducing valve is connected with the rodless cavity of each supporting oil cylinder respectively, and the pressure reducing valve is used for adjusting the oil pressure flowing to the rodless cavity of each supporting oil cylinder. The function of the hydraulic pump is to provide an oil source for the supporting oil cylinder hydraulic system, and the pressure reducing valve is used for adjusting the pressure of the hydraulic system.

[0030] By using the prop oil cylinder supporting hydraulic system provided by the present application, the hydraulic oil in the oil tank enters the rodless cavity of the supporting oil cylinder through the hydraulic pump and the pressure reducing valve. In the propelling mode of the shield machine, during the normal excavation process of the shield machine, the propelling oil cylinder needs to be low-pressure supported because it needs to be adjusted in direction, at this time, the supporting oil cylinder can float with the yaw of the propelling oil cylinder to achieve the purpose of protecting the propelling oil cylinder. In the segment assembling mode, the shield machine does not perform excavation operation, and the propelling oil cylinder needs to be fixed during the segment assembling process, so the propelling oil cylinder needs to be high-pressure supported, and the supporting oil cylinder is pressed tightly around the propelling oil cylinder in the high-pressure mode to achieve the purpose of protecting the propelling oil cylinder. Therefore, in the propelling mode and the segment assembling mode, the oil supply pressure of the rodless cavity is adjusted through the pressure reducing valve to extend the supporting oil cylinder in the low-pressure mode in the propelling mode and in the high-pressure mode in the segment assembling mode. In summary, by using the prop oil cylinder supporting hydraulic system, the action of the supporting oil cylinder in different modes of the shield machine is realized to meet the different pressure requirements of the supporting oil cylinder in different modes of the shield machine.

[0031] Please refer to Figure 1 , Figure 1 The structure diagram of the prop oil cylinder supporting hydraulic system of the shield machine in one embodiment of the present application is shown.

[0032] In one embodiment, the prop oil cylinder supporting hydraulic system provided by the present application comprises a hydraulic pump 3, an oil tank 14, a first pressure reducing valve 7, a second pressure reducing valve 8 and a first reversing valve 9.

[0033] The oil inlet of the hydraulic pump 3 is connected with the oil tank 14, and the oil outlets of the hydraulic pump 3 are respectively connected with the oil inlets of the first pressure reducing valve 7 and the second pressure reducing valve 8. The hydraulic pump 3 is used to provide an oil source for the hydraulic system of the support oil cylinder 13, and is specifically connected with the motor 1, such as through the shaft coupling 2. The motor 1 provides power for the hydraulic pump 3, and the shaft coupling 2 transmits the power of the motor 1 to the hydraulic pump 3, so as to drive the hydraulic pump 3 to work.

[0034] The first pressure reducing valve 7 and the second pressure reducing valve 8 are respectively used to adjust the pressure of the hydraulic system, the oil outlet pressure of the first pressure reducing valve 7 is less than that of the second pressure reducing valve 8, that is, the first pressure reducing valve 7 corresponds to a low pressure mode, and the second pressure reducing valve 8 corresponds to a high pressure mode. The oil is pumped by the hydraulic pump 3 to flow into the oil inlet of the first pressure reducing valve 7 or the oil inlet of the second pressure reducing valve 8, and flows out from the oil outlet of the first pressure reducing valve 7 or the oil outlet of the second pressure reducing valve 8 after the pressure reduction of the first pressure reducing valve 7 or the second pressure reducing valve 8.

[0035] The first working oil port of the first reversing valve 9 is connected with the oil outlet of the second pressure reducing valve 8, the second working oil port of the first reversing valve 9 is connected with the rodless cavity of each support oil cylinder 13, and the third working oil port of the first reversing valve 9 is connected with the oil outlet of the first pressure reducing valve 7. When the first reversing valve 9 is placed in the first position, the second working oil port of the first reversing valve 9 is in communication with the third working oil port of the first reversing valve 9, then the oil is pumped by the hydraulic pump 3 to flow into the oil inlet of the first pressure reducing valve 7, and flows out from the oil outlet of the first pressure reducing valve 7 after the pressure reduction of the first pressure reducing valve 7, and flows into the rodless cavity of the support oil cylinder 13 through the channel between the third working oil port and the second working oil port of the first reversing valve 9.

[0036] When the first reversing valve 9 is placed in the second position, the second working oil port of the first reversing valve 9 is in communication with the first working oil port of the first reversing valve 9, then the oil is pumped by the hydraulic pump 3 to flow into the oil inlet of the second pressure reducing valve 8, and flows out from the oil outlet of the second pressure reducing valve 8 after the pressure reduction of the second pressure reducing valve 8, and flows into the rodless cavity of the support oil cylinder 13 through the channel between the first working oil port and the second working oil port of the first reversing valve 9.

[0037] In the propelling mode of the shield machine, the propelling oil cylinder needs low pressure support during the normal excavation process of the shield machine, and the support oil cylinder 13 can float with the deflection of the propelling oil cylinder to achieve the purpose of protecting the propelling oil cylinder. In this mode, the first reversing valve 9 is placed in the first position, the second working oil port of the first reversing valve 9 is in communication with the third working oil port of the first reversing valve 9, and then the hydraulic oil in the oil tank 14 enters the rodless cavity of the support oil cylinder 13 through the hydraulic pump 3, the first pressure reducing valve 7, the third working oil port to the second working oil port of the first reversing valve 9, and the support oil cylinder 13 is extended in the low pressure mode. In the segment assembly mode, the shield machine does not perform excavation work, and the propelling oil cylinder needs to be fixed during the segment assembly process, so the propelling oil cylinder needs high pressure support, and the support oil cylinder 13 is circumferentially compressed in the high pressure mode to achieve the purpose of protecting the propelling oil cylinder. In this mode, the first reversing valve 9 is placed in the second position, the second working oil port of the first reversing valve 9 is in communication with the first working oil port of the first reversing valve 9, and then the hydraulic oil in the oil tank 14 enters the rodless cavity of the support oil cylinder 13 through the hydraulic pump 3, the second pressure reducing valve 8, the first working oil port to the second working oil port of the first reversing valve 9, and the support oil cylinder 13 is extended in the high pressure mode. In summary, by switching the pressure of the first reversing valve 9 in cooperation with the first pressure reducing valve 7 and the second pressure reducing valve 8, the support oil cylinder 13 can be actuated in different modes of the shield machine to meet the different pressure requirements of the support oil cylinder 13 in different modes of the shield machine.

[0038] In one embodiment, a second reversing valve 10 is further included, the first working oil port of the second reversing valve 10 is connected with the second working oil port of the first reversing valve 9, the second working oil port of the second reversing valve 10 is connected with the rodless cavity of each support oil cylinder 13, and the third working oil port of the second reversing valve 10 is connected with the oil tank 14. When the second reversing valve 10 is placed in the first position, the second working oil port of the second reversing valve 10 is in communication with the third working oil port of the second reversing valve 10, and then the rodless cavity of each support oil cylinder 13 is connected with the oil tank 14. When the second reversing valve 10 is placed in the second position, the second working oil port of the second reversing valve 10 is in communication with the first working oil port of the second reversing valve 10, and then the rodless cavity of the support oil cylinder 13 is connected with the hydraulic pump 3 through the first reversing valve 9 and then the first pressure reducing valve 7 or the second pressure reducing valve 8. That is, whether to supply oil to the support oil cylinder 13 is switched by the second reversing valve 10. In the propelling mode and the segment assembly mode, the second reversing valve 10 is placed in the second position, and in the shutdown mode, the second reversing valve 10 is placed in the first position.

[0039] In one embodiment, the third oil port of the second directional valve 10 is connected with the oil tank 14 through a first overflow valve 6. The first overflow valve 6 is used to prevent the support oil cylinder 13 from being pressed back by the propulsion oil cylinder when the machine is stopped, thereby protecting the support oil cylinder 13. When the machine is stopped, the second directional valve 10 is in the first position, the hydraulic oil in the rodless chamber of each support oil cylinder 13 flows to the first overflow valve 6 through the channel from the second oil port to the third oil port of the second directional valve 10, and then flows through the first overflow valve 6 to provide a certain back pressure.

[0040] In one embodiment, an electromagnetic ball valve 11 and a first check valve 12 are further arranged corresponding to the rodless chamber of each support oil cylinder 13. The two ends of each electromagnetic ball valve 11 are respectively connected with the second working oil port of the second directional valve 10 and the rodless chamber of the corresponding support oil cylinder 13. The two ends of each first check valve 12 are respectively connected with the two ends of the corresponding electromagnetic ball valve 11, which is used to control the hydraulic oil to flow only from the rodless chamber of the support oil cylinder 13 to the second working oil port of the second directional valve 10. Specifically, the first end of each electromagnetic ball valve 11 is connected with the second working oil port of the second directional valve 10, the second end of each electromagnetic ball valve 11 is connected with the rodless chamber of each support oil cylinder 13, the first end of each first check valve 12 is connected with the first end of the corresponding electromagnetic ball valve 11, the second end of each first check valve 12 is connected with the second end of the corresponding electromagnetic ball valve 11, and the first check valve 12 is used to control the hydraulic oil to flow from the second end to the first end. The first check valve 12 is used to drain the oil in the support oil cylinder 13 to the first overflow valve 6 when the machine is stopped. The electromagnetic ball valve 11 is used to control whether the support oil cylinder 13 is in action. Thus, when the machine is stopped, each electromagnetic ball valve 11 is closed, the second directional valve 10 is in the first position, and the hydraulic oil in the rodless chamber of each support oil cylinder 13 flows to the first overflow valve 6 through the channel from the second oil port to the third oil port of the second directional valve 10 under the drainage effect of the first check valve 12, and then flows through the first overflow valve 6 to provide a certain back pressure.

[0041] In one embodiment, the oil outlet of the hydraulic pump 3 is connected with the pressure reducing valve through a second check valve. When the pressure reducing valve includes a first pressure reducing valve 7 and a second pressure reducing valve 8, the oil outlet of the hydraulic pump 3 is connected with the first pressure reducing valve 7 and the second pressure reducing valve 8 through a second check valve 5. The second check valve 5 is used to control the hydraulic oil to flow only from the hydraulic pump 3 to the first pressure reducing valve 7 or the second pressure reducing valve 8. Specifically, the oil outlet of the hydraulic pump 3 is connected with the first pressure reducing valve 7 through the second check valve 5, and the second pressure reducing valve 8 is also located between the oil outlet of the hydraulic pump 3 and the second pressure reducing valve 8. The second check valve 5 is used to prevent the hydraulic oil from flowing back to the hydraulic pump 3. Thus, in the propulsion mode, the hydraulic oil in the oil tank 14 flows to the first pressure reducing valve 7 or the second pressure reducing valve 8 through the hydraulic pump 3 and the second check valve 5. According to the needs, two second check valves 5 can also be arranged, which are respectively connected between the oil outlet of the hydraulic pump 3 and the first pressure reducing valve 7 and the second pressure reducing valve 8.

[0042] In one embodiment, a second relief valve 4 is connected between the outlet of the hydraulic pump 3 and the oil tank 14. The second relief valve 4 is used to limit the system pressure. When the system pressure is higher than a preset value, the second relief valve 4 is activated, and the hydraulic oil flows back to the oil tank 14 through the second relief valve 4.

[0043] The first directional valve 9 and the second directional valve 10 can specifically be electromagnetic directional valves for automatic control. In one embodiment, the normal operation of the first directional valve 9, the second directional valve 10, and the electromagnetic ball valve 11 is as follows: Figure 1 As shown. In propulsion mode, the first directional valve 9 is de-energized, while the second directional valve 10 and the solenoid ball valve 11 are energized. Hydraulic oil in tank 14 enters the rodless chamber of support cylinder 13 through hydraulic pump 3, second check valve 5, first pressure reducing valve 7, the channel from the third working port to the second working port of first directional valve 9, the channel from the first working port to the second working port of second directional valve 10, and solenoid ball valve 11, causing support cylinder 13 to extend in low-pressure mode. In segment assembly mode, the first directional valve 9 is energized, the second directional valve 10 is energized, and the solenoid ball valve 11 is energized. Hydraulic oil in tank 14 enters the rodless chamber of support cylinder 13 through hydraulic pump 3, second check valve 5, second pressure reducing valve 8, the channel from the first working port to the second working port of first directional valve 9, the channel from the first working port to the second working port of second directional valve 10, and solenoid ball valve 11, causing support cylinder 13 to extend in high-pressure mode. In shutdown mode, solenoid ball valve 11 and second directional valve 10 are not energized. First relief valve 6 protects support cylinder 13. At this time, first directional valve 9, second directional valve 10, and solenoid ball valve 11 are not energized. Hydraulic oil in the rodless chamber of support cylinder 13 flows through the channel from the second working port of first check valve 12 and second directional valve 10 to the first working port, and then to first relief valve 6.

[0044] The present invention also provides a hydraulic system for supporting propulsion cylinders, including a hydraulic pump 3, an oil tank 14, and a proportional pressure reducing valve. The inlet of the hydraulic pump 3 is connected to the oil tank 14, the inlet of the proportional pressure reducing valve is connected to the outlet of the hydraulic pump 3, and the outlet of the proportional pressure reducing valve is connected to the rodless chamber of each supporting cylinder 13. The outlet pressure of the proportional pressure reducing valve is adjustable.

[0045] The difference between this embodiment and the previous embodiments is that a proportional pressure reducer is used instead of the first pressure reducing valve 7 and the second pressure reducing valve 8 in the previous embodiments, thus eliminating the need for the first directional valve 9. Switching between low-pressure and high-pressure modes can be achieved by adjusting the outlet pressure of the proportional pressure reducing valve. Specifically, the proportional pressure reducing valve can be controlled by an external PLC to adjust its pressure reduction value. The settings of other components in this embodiment can refer to the relevant settings in the previous embodiments, and will not be repeated here.

[0046] The hydraulic system for supporting the thrust cylinder provided by the application can realize the pressure adjustment of the rodless cavity of the supporting cylinder 13 by adjusting the oil outlet pressure of the proportional pressure reducing valve, so as to realize the action of the supporting cylinder 13 in different modes of the shield machine.

[0047] In one embodiment, a reversing valve is further included, a first working oil port of the reversing valve is connected with the oil outlet of the proportional pressure reducing valve, a second working oil port of the reversing valve is connected with the rodless cavity of each supporting cylinder 13, and a third working oil port of the reversing valve is connected with the oil tank 14. When the second reversing valve 10 is in the first position, the second working oil port and the third working oil port of the second reversing valve 10 are in communication. When the second reversing valve 10 is in the second position, the second working oil port and the first working oil port of the second reversing valve 10 are in communication. The reversing valve can correspond to the second reversing valve in the embodiment shown above. Figure 1

[0048] In one embodiment, the third oil port of the reversing valve is connected with the oil tank 14 through a first overflow valve 6.

[0049] In one embodiment, an electromagnetic ball valve 11 and a first one-way valve 12 are further included and arranged one-to-one corresponding to the rodless cavities of the supporting cylinders 13. The two ends of each electromagnetic ball valve 11 are connected with the second working oil port of the second reversing valve 10 and the rodless cavity of the corresponding supporting cylinder 13, respectively. The two ends of each first one-way valve 12 are connected with the two ends of the corresponding electromagnetic ball valve 11, respectively, for controlling the hydraulic oil to flow only from the rodless cavity of the supporting cylinder 13 to the second working oil port of the second reversing valve 10.

[0050] In one embodiment, the oil outlet of the hydraulic pump 3 is connected with the proportional pressure reducing valve through a second one-way valve 5, and the second one-way valve 5 is used for controlling the hydraulic oil to flow only from the hydraulic pump 3 to the proportional pressure reducing valve.

[0051] In one embodiment, the oil outlet of the hydraulic pump 3 is connected with the oil tank 14 through a second overflow valve 4.

[0052] Based on the hydraulic system for supporting the thrust cylinder provided in the above-mentioned embodiments, the application further provides a shield machine, which includes any one of the hydraulic systems for supporting the thrust cylinder in the above-mentioned embodiments. Since the shield machine adopts the hydraulic system for supporting the thrust cylinder in the above-mentioned embodiments, the beneficial effects of the shield machine are described in the above-mentioned embodiments.

[0053] In the specification, each embodiment is described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts of each embodiment can be referred to each other.

[0054] ​The foregoing description of the disclosed embodiments enables a person skilled in the art to make or use the application. Modifications of these embodiments will occur to persons of skill in the art, and that the appended claims are intended to cover all such modifications that do not depart from the true spirit and scope of the application. Therefore, the application is not limited to the embodiments shown but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hydraulic support system for the propulsion cylinder of a tunnel boring machine, used to control the support cylinder supporting the propulsion cylinder, characterized in that, The system includes a hydraulic pump, an oil tank, and a pressure reducing valve. The oil inlet of the hydraulic pump is connected to the oil tank, the oil inlet of the pressure reducing valve is connected to the oil outlet of the hydraulic pump, and the oil outlet of the pressure reducing valve is connected to the rodless chamber of each of the supporting cylinders. The pressure reducing valve is used to regulate the oil pressure flowing to the rodless chamber of each of the supporting cylinders. It also includes a first directional valve, and the pressure reducing valve includes a first pressure reducing valve and a second pressure reducing valve. The oil inlet of the first pressure reducing valve and the oil inlet of the second pressure reducing valve are respectively connected to the oil outlet of the hydraulic pump. The first working oil port of the first directional valve is connected to the oil outlet of the second pressure reducing valve. The second working oil port of the first directional valve is connected to the rodless chamber of each of the support cylinders. The third working oil port of the first directional valve is connected to the oil outlet of the first pressure reducing valve. When the first directional valve is in the first position, the second working oil port and the third working oil port of the first directional valve are connected. When the first directional valve is in the second position, the second working oil port and the first working oil port of the first directional valve are connected. The oil outlet pressure of the first pressure reducing valve is less than the oil outlet pressure of the second pressure reducing valve. In the tunnel boring machine propulsion mode, the first directional valve is in the first position, and the hydraulic oil in the oil tank enters the rodless chamber of the support cylinder through the hydraulic pump, the first pressure reducing valve, the third working oil port of the first directional valve to the second working oil port channel, and the support cylinder extends in low pressure mode. In the segment assembly mode, the first directional valve is in the second position, and the hydraulic oil in the oil tank enters the rodless chamber of the support cylinder through the hydraulic pump, the second pressure reducing valve, and the first working oil port to the second working oil port channel of the first directional valve, and the support cylinder extends in high pressure mode.

2. The propulsion cylinder support hydraulic system according to claim 1, characterized in that, It also includes a second directional valve, the first working port of the second directional valve is connected to the second working port of the first directional valve, the second working port of the second directional valve is connected to the rodless chamber of each of the support cylinders, and the third working port of the second directional valve is connected to the oil tank. When the second directional valve is in the first position, the second working port and the third working port of the second directional valve are connected. When the second directional valve is in the second position, the second working port of the second directional valve is connected to the first working port.

3. The propulsion cylinder support hydraulic system according to claim 2, characterized in that, A first overflow valve is connected between the third oil port of the second reversing valve and the oil tank. The first overflow valve is used to prevent the propulsion cylinder from pushing the support cylinder back when the machine stops.

4. The propulsion cylinder support hydraulic system according to claim 3, characterized in that, It also includes an electromagnetic ball valve and a first check valve that are respectively provided in a one-to-one correspondence with the rodless chamber of each of the support cylinders. The two ends of each electromagnetic ball valve are respectively connected to the second working port of the second directional valve and the corresponding rodless chamber of the support cylinder. The two ends of each first check valve are respectively connected to the two ends of each corresponding electromagnetic ball valve, which are used to control the hydraulic oil to flow only from the rodless chamber of the support cylinder to the second working port of the second directional valve.

5. The propulsion cylinder support hydraulic system according to any one of claims 1-4, characterized in that, A second check valve is connected between the oil outlet of the hydraulic pump and the pressure reducing valve. The second check valve is used to control the hydraulic oil to flow only from the hydraulic pump to the pressure reducing valve.

6. The propulsion cylinder support hydraulic system according to any one of claims 1-4, characterized in that, A second relief valve is connected between the oil outlet of the hydraulic pump and the oil tank.

7. The propulsion cylinder support hydraulic system according to claim 1, characterized in that, The pressure reducing valve is a proportional pressure reducing valve, and the outlet pressure of the proportional pressure reducing valve is adjustable.

8. A tunnel boring machine, characterized in that, Includes the propulsion cylinder support hydraulic system as described in any one of claims 1-7.

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