Shield pipeline extension mechanism pipe replacement hydraulic control system and shield machine

Abstract

The present invention discloses a shield machine pipeline extension mechanism pipe replacement hydraulic control system, including a hydraulic motor for driving gear rotation and a reversing valve for controlling the oil inlet direction of the hydraulic motor, the oil inlet and the oil return port of the reversing valve are respectively connected to the system oil supply and the system oil return, the two working oil ports of the reversing valve are respectively connected to the forward oil port and the backward oil port of the hydraulic motor, the system oil supply is also separately connected to the backward oil port of the hydraulic motor through a control valve, when the shield machine pipe is replaced, the control valve is closed to block the system oil supply from entering the backward oil port through the control valve, and when the shield machine is excavating, the control valve is opened to allow the system oil supply to enter the backward oil port through the control valve. When the shield machine is excavating, the pipeline extension mechanism passively retreats relative to the shield machine, the structure is simple and easy to maintain, the layout is compact and is not limited by the tunnel turning radius, and the structure is not affected by the pipeline diameter, and the layout is not limited by the tunnel height. The present invention also discloses a shield machine including the above hydraulic control system.

Description

Technical Field

[0001] The present invention relates to the field of shield equipment, and in particular to a shield pipeline extension mechanism pipe replacement hydraulic control system. In addition, the present invention also relates to a shield machine including the hydraulic control system. Background Art

[0002] Shield machines are widely used in the field of tunnel excavation. In recent years, the horizontal hose extension type mud pipeline extension mechanism of shield machines has been increasingly widely used due to its compact structure, no restrictions on the turning radius of tunnel engineering, convenient and reliable operation, simple structure and convenient maintenance. At present, the travel device drive of the horizontal hose extension type mud pipeline extension mechanism is mainly realized in the form of gear racks. A rack track is set on the main trailer, and a gear is set on the travel device. By driving the gear forward and reverse, the pipeline extension mechanism moves forward or backward on the rack track to achieve pipeline extension.

[0003] When the shield machine changes pipes, the shield machine advances forward for a certain distance, and the pipe extension mechanism passively retreats the same distance, disconnecting the pipe fixed on the pipe extension mechanism from the pipe in the tunnel. The pipe extension mechanism moves back to the initial position, that is, the front end of the trailer, and the pipe fixed on the pipe extension mechanism and the tunnel pipe form a gap. The new pipe is connected to this gap to achieve pipe extension. If the pipe extension mechanism cannot actively move forward, then the new pipe cannot be connected; if it cannot actively move forward and backward, the pipe gap and the pipe length must be completely equal, which places too high requirements on the excavation process and pipe length, and it is also difficult to connect the new pipe.

[0004] When the shield machine is excavating, it is necessary to connect the pipeline fixed on the pipeline extension mechanism with the pipeline fixed on the tunnel to complete the slag discharge work, and there should be no movement tendency relative to the tunnel. However, when the shield machine is excavating, the rack track fixed on the trailer moves with the excavation direction, the gear of the traveling device rotates passively, and the entire pipeline extension device has a movement tendency relative to the tunnel. It is not difficult to see that when the shield machine is excavating, the movement tendency of the pipeline extension mechanism relative to the tunnel is inconsistent with the construction requirements.

[0005] Therefore, how to provide a shield pipeline extension mechanism pipe replacement hydraulic control system that overcomes the above-mentioned problems is a technical problem that technical personnel in this field currently need to solve. Summary of the invention

[0006] The purpose of the present invention is to provide a shield machine pipeline extension mechanism pipe replacement hydraulic control system, when the shield machine pipe replacement, by switching the reversing valve working position to achieve the active forward and backward movement of the pipeline extension mechanism, when the shield machine excavation, by replenishing oil to the motor and providing a certain back pressure, the pipeline extension mechanism is passively retreated relative to the shield machine. Another purpose of the present invention is to provide a shield machine including the above hydraulic control system.

[0007] In order to solve the above technical problems, the present invention provides a shield pipeline extension mechanism pipe changing hydraulic control system, including a hydraulic motor for driving gear rotation and a reversing valve for controlling the oil inlet direction of the hydraulic motor, the oil inlet and oil return port of the reversing valve are respectively connected to the system oil supply and the system oil return, the two working oil ports of the reversing valve are respectively connected to the forward oil port and the reverse oil port of the hydraulic motor, the system oil supply is also separately connected to the reverse oil port of the hydraulic motor through a control valve, when the shield machine changes the pipe, the control valve is closed to block the system oil supply from entering the reverse oil port through the control valve, and when the shield machine is excavating, the control valve is opened to allow the system oil supply to enter the reverse oil port through the control valve.

[0008] Preferably, the reversing valve is a three-position four-way solenoid reversing valve. When the shield machine changes pipes, the three-position four-way solenoid reversing valve is in the first working position or the second working position, so that the oil inlet of the three-position four-way solenoid reversing valve is connected to one of the two working oil ports, and the oil return port of the three-position four-way solenoid reversing valve is connected to the other of the two working oil ports.

[0009] Preferably, the middle position function of the three-position four-way solenoid reversing valve is Y-type, and the three-position four-way solenoid reversing valve is in the middle position when the shield machine is excavating, and the two working oil ports of the three-position four-way solenoid reversing valve are connected to the return oil port.

[0010] Preferably, a speed regulating valve is provided between the system oil supply and the reversing valve.

[0011] Preferably, an active pressure reducing valve is provided between the speed regulating valve and the reversing valve.

[0012] Preferably, the control valve is a solenoid ball valve.

[0013] Preferably, a balancing valve is provided between the reversing valve and the hydraulic motor.

[0014] Preferably, an oil replenishment and pressure reducing valve is provided between the system oil supply and the control valve, the forward oil port of the hydraulic motor is also connected to the system oil return through a relief valve, and the opening pressures of the oil replenishment and pressure reducing valve and the relief valve are equal.

[0015] Preferably, the two oil ports of the overflow valve are directly connected to the forward oil port of the hydraulic motor and one working oil port of the reversing valve respectively.

[0016] The present invention provides a shield machine, comprising the shield pipeline extension mechanism pipe replacement hydraulic control system as described in any one of the above items.

[0017] The present invention provides a shield pipeline extension mechanism pipe replacement hydraulic control system, comprising a hydraulic motor for driving gear rotation and a reversing valve for controlling the oil inlet direction of the hydraulic motor, the oil inlet and oil return port of the reversing valve are respectively connected to the system oil supply and the system oil return, the two working oil ports of the reversing valve are respectively connected to the forward oil port and the backward oil port of the hydraulic motor, the system oil supply is also separately connected to the backward oil port of the hydraulic motor through a control valve, when the shield machine changes the pipe, the control valve is closed to block the system oil supply from entering the backward oil port through the control valve, and when the shield machine is excavating, the control valve is opened to allow the system oil supply to enter the backward oil port through the control valve.

[0018] During operation, when the shield machine changes the pipe, the control valve is closed, and the system oil supply and the rear oil port of the hydraulic motor are isolated in the oil circuit where the control valve is located. The system oil supply is connected to the oil inlet of the reversing valve to block the system oil supply from entering the rear oil port from the control valve. The system return oil is connected to the oil return port of the reversing valve. The reversing valve switches the working position to connect the forward oil port of the hydraulic motor to the system oil supply, thereby making the hydraulic motor drive gear rotate forward, and the pipeline extension mechanism actively moves forward relative to the rack track of the trailer, or connects the rear oil port of the hydraulic motor to the system oil supply, thereby making the hydraulic motor drive gear reverse, and the pipeline extension mechanism actively moves backward relative to the rack track of the trailer.

[0019] When the shield machine is excavating, the reversing valve is in the stop position and will not affect the hydraulic motor. The control valve is opened, and the system oil supply and the rear oil port of the hydraulic motor are connected on the oil circuit where the control valve is located, so that the system oil supply enters the rear oil port through the control valve. The trailer also moves forward with the shield machine, and the gears of the pipeline extension mechanism will also passively rotate under the influence of the rack track of the trailer. At this time, the hydraulic motor will also be driven by the gears to rotate passively, and the system oil supply is used to replenish oil to the rear oil port of the hydraulic motor. At the same time, the overflow valve provides return oil back pressure to ensure that the pipeline extension mechanism is stationary relative to the tunnel and the pipeline extension mechanism moves backward passively relative to the shield machine.

[0020] The pipeline extension mechanism can actively move forward and backward when the shield machine changes pipes; and passively move backward relative to the shield machine when the shield machine is excavating. The pipeline extension mechanism controlled by the hydraulic control system disclosed in the present invention has a simple structure, convenient maintenance, compact layout, and is not limited by the turning radius of the tunnel. The structure is not affected by the pipeline diameter, and the layout is not limited by the tunnel height.

[0021] The present invention also provides a shield machine including the above-mentioned hydraulic control system. Since the above-mentioned hydraulic control system has the above-mentioned technical effects, the above-mentioned shield machine should also have the same technical effects, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A hydraulic principle diagram of a specific implementation of the shield pipeline extension mechanism pipe replacement hydraulic control system provided by the present invention;

[0023] Figure 2 It is a structural schematic diagram of a specific implementation of the shield pipeline extension mechanism pipe replacement hydraulic control system provided by the present invention. DETAILED DESCRIPTION

[0024] The core of the present invention is to provide a shield machine pipeline extension mechanism pipe replacement hydraulic control system. When the shield machine changes the pipe, the pipeline extension mechanism is actively advanced and retreated by switching the working position of the reversing valve. When the shield machine is excavating, the pipeline extension mechanism is passively retreated relative to the shield machine by replenishing oil to the motor and providing a certain back pressure. Another core of the present invention is to provide a shield machine including the above hydraulic control system.

[0025] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0026] Please refer to Figure 1 and Figure 2 , Figure 1 A hydraulic principle diagram of a specific implementation of the shield pipeline extension mechanism pipe replacement hydraulic control system provided by the present invention; Figure 2 It is a structural schematic diagram of a specific implementation of the shield pipeline extension mechanism pipe replacement hydraulic control system provided by the present invention.

[0027] The specific embodiment of the present invention provides a shield pipeline extension mechanism pipe replacement hydraulic control system, including a hydraulic motor 1, a reversing valve and a control valve 3. The hydraulic motor 1 drives the gear 9 to rotate the reversing valve to control the oil inlet direction of the hydraulic motor 1. The oil inlet and the oil return port of the reversing valve are respectively connected to the system oil supply and the system oil return. The two working oil ports of the reversing valve are respectively connected to the forward oil port A and the backward oil port B of the hydraulic motor 1. When the forward oil port A is fed with oil, the backward oil port B is discharged with oil, the hydraulic motor 1 drives the gear 9 to rotate forward, and the driving pipeline extension mechanism actively moves forward. On the contrary, when the backward oil port B is fed with oil, the forward oil port A is discharged with oil, the hydraulic motor 1 drives the gear 9 to reverse, and the driving pipeline extension mechanism actively moves backward. The system oil supply is also connected to the backward oil port B of the hydraulic motor 1 separately through the control valve 3. When the shield machine changes the pipe, the control valve 3 is closed to block the system oil supply from entering the backward oil port B through the control valve 3. When the shield machine is excavating, the control valve 3 is opened to allow the system oil supply to enter the backward oil port B through the control valve 3.

[0028] During operation, when the shield machine changes pipes, the control valve 3 is closed, and the system oil supply and the retract oil port B of the hydraulic motor 1 are isolated in the oil circuit where the control valve 3 is located, and the system oil supply is blocked from entering the retract oil port B from the control valve 3. The system oil supply is connected to the oil inlet of the reversing valve, and the system return oil is connected to the oil return port of the reversing valve. The reversing valve switches the working position to connect the forward oil port A of the hydraulic motor 1 to the system oil supply, thereby making the hydraulic motor 1 drive the gear 9 to rotate forward, and the pipeline extension mechanism actively moves forward relative to the rack track 10 of the trailer, or connects the retract oil port B of the hydraulic motor 1 to the system oil supply, thereby making the hydraulic motor 1 drive the gear 9 to reverse, and the pipeline extension mechanism actively moves backward relative to the rack track 10 of the trailer.

[0029] When the shield machine is excavating, the reversing valve is in the stop position and will not affect the hydraulic motor 1. The control valve 3 is opened, and the system oil supply and the rear oil port B of the hydraulic motor 1 are connected on the oil circuit where the control valve 3 is located, so that the system oil supply enters the rear oil port B through the control valve 3. The trailer also moves forward with the shield machine, and the gear 9 of the pipeline extension mechanism will also rotate passively under the influence of the rack track 10 of the trailer. At this time, the hydraulic motor 1 will also be driven by the gear 9 to rotate passively, and the system oil supply is used to replenish oil to the rear oil port B of the hydraulic motor 1. At the same time, the overflow valve 8 provides return oil back pressure to ensure that the pipeline extension mechanism is stationary relative to the tunnel and the pipeline extension mechanism moves backward passively relative to the shield machine.

[0030] When the shield machine changes pipes, the shield machine advances forward for a certain distance, and the pipe extension mechanism passively retreats the same distance, disconnecting the pipe fixed on the pipe extension mechanism from the pipe in the tunnel. The pipe extension mechanism moves back to the initial position, that is, the front end of the trailer, and the pipe fixed on the pipe extension mechanism and the tunnel pipe form a gap. The new pipe is connected to this gap to achieve pipe extension. If the pipe extension mechanism cannot actively move forward, then the new pipe cannot be connected; if it cannot actively move forward and backward, the pipe gap and the pipe length must be completely equal, which places too high requirements on the excavation process and pipe length, and it is also difficult to connect the new pipe.

[0031] When the shield machine is excavating, it is necessary to connect the pipeline fixed on the pipeline extension mechanism with the pipeline fixed on the tunnel to complete the slag discharge work, and there should be no movement tendency relative to the tunnel. However, when the shield machine is excavating, the rack track fixed on the trailer moves with the excavation direction, the gear of the traveling device rotates passively, and the entire pipeline extension device has a movement tendency relative to the tunnel. It is not difficult to see that when the shield machine is excavating, the movement tendency of the pipeline extension mechanism relative to the tunnel is inconsistent with the construction requirements.

[0032] The system enables the pipeline extension mechanism to actively move forward and backward through the coordination of various valves, and quickly and safely achieve pipeline extension; it also enables the pipeline extension mechanism to passively retreat through the coordination of various valves to meet construction requirements. Furthermore, compared with traditional mechanisms, the pipeline extension mechanism controlled by the hydraulic control system of the present invention has a simple structure and convenient maintenance, a compact layout, and is not limited by the turning radius of the tunnel, the structure is not affected by the pipeline diameter, and the layout is not limited by the tunnel height.

[0033] Specifically, the reversing valve is a three-position four-way solenoid reversing valve 2. When the shield machine changes pipes, the three-position four-way solenoid reversing valve 2 is in the first working position or the second working position, so that the oil inlet of the three-position four-way solenoid reversing valve 2 is connected to one of the two working oil ports, and the oil return port of the three-position four-way solenoid reversing valve 2 is connected to the other of the two working oil ports, so that the system oil supply is connected to the forward oil port A or the reverse oil port B of the hydraulic motor 1, so as to realize the forward and reverse rotation of the hydraulic motor 1, or adjust the connection mode of the oil port and the connection and isolation control mode of the valve, all of which are within the protection scope of the present invention.

[0034] Furthermore, the middle position function of the three-position four-way solenoid reversing valve 2 is Y-type. When the shield machine is excavating, the three-position four-way solenoid reversing valve 2 is in the middle position, and the two working oil ports of the three-position four-way solenoid reversing valve 2 are connected to the return oil port, which does not affect the operation of the hydraulic motor 1.

[0035] In the shield pipeline extension mechanism pipe replacement hydraulic control system provided in the specific embodiment of the present invention, a speed regulating valve 4 is arranged between the system oil supply and the reversing valve to control the hydraulic oil flow of the system oil supply entering the hydraulic motor 1 and adjust the rotation speed of the hydraulic motor 1, that is, the speed at which the pipeline extension mechanism actively moves forward and backward, or other types of valves with the function of adjusting the hydraulic oil flow are used, all of which are within the protection scope of the present invention.

[0036] An active pressure reducing valve 5 is provided between the speed regulating valve 4 and the reversing valve to limit the pressure of the hydraulic motor 1 when the pipeline extension mechanism actively moves forward and backward. The control valve 3 is specifically an electromagnetic ball valve, and the type and connection mode of each valve can also be adjusted according to the situation. Various schemes of using valves with switching functions are all within the protection scope of the present invention.

[0037] Preferably, a balancing valve 6 is also provided between the reversing valve and the hydraulic motor 1, including two valve groups respectively provided on the two oil circuits between the reversing valve and the hydraulic motor 1, each valve group including a one-way valve channel and an overflow valve channel, and the overflow valve channels of the two valve groups are also interconnected and controlled to lock the pressure of the forward oil port A and the reverse oil port B of the hydraulic motor 1, and at the same time limit the excessive pressure on both sides. Of course, the balancing valve 6 can also be replaced by a hydraulic lock.

[0038] On the basis of the shield pipeline extension mechanism pipe replacement hydraulic control system provided in the above-mentioned specific embodiments, an oil replenishment pressure reducing valve 7 is arranged between the system oil supply and the control valve 3 to limit the oil replenishment pressure of the hydraulic motor 1 when the pipeline extension mechanism is passively retreated. The forward oil port A of the hydraulic motor 1 is also connected to the system return oil through the overflow valve 8 to limit the return oil back pressure of the hydraulic motor 1 when the pipeline extension mechanism is passively retreated. The opening pressures of the oil replenishment pressure reducing valve 7 and the overflow valve 8 are equal, thereby ensuring that the pipeline extension mechanism is absolutely stationary and moves backward relative to the trailer. Among them, the opening pressures of the oil replenishment pressure reducing valve 7 and the overflow valve 8 can be basically the same, and the difference range can be less than 1 bar. At the same time, the specific value is related to the extended pressure loss and the local pressure loss, and it can be within a reasonable range according to the actual situation. Or the hydraulic motor 1 retreat oil port B and the hydraulic motor 1 return oil back pressure at this time can be basically the same.

[0039] Specifically, the two oil ports of the relief valve 8 are directly connected to the forward oil port A of the hydraulic motor 1 and a working oil port of the reversing valve 2. When the shield machine is excavating, the control valve 3 is opened, and the hydraulic oil output by the system oil supply passes through the oil replenishment and pressure reducing valve 7 and the control valve 3 in turn to enter the reverse oil port B of the hydraulic motor 1, and then the hydraulic oil is output from the forward oil port A, passes through the relief valve 8 and the reversing valve in turn and flows back to the system return oil. The relief valve 8 is connected in parallel with the balance valve 6. At this time, the hydraulic oil will not be affected by the balance valve 6, and only flows through the relief valve 8. Similarly, when the shield machine changes the pipe, the hydraulic oil will not be affected by the relief valve 8, and only flows through the balance valve 6.

[0040] In addition to the above-mentioned shield pipeline extension mechanism pipe replacement hydraulic control system, a specific embodiment of the present invention also provides a shield machine including the above-mentioned shield pipeline extension mechanism pipe replacement hydraulic control system. Please refer to the prior art for the structure of other parts of the shield machine, which will not be repeated in this article.

[0041] The shield pipeline extension mechanism pipe replacement hydraulic control system and shield machine provided by the present invention are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A shield pipeline extension mechanism pipe replacement hydraulic control system, characterized in that: It comprises a hydraulic motor (1) for driving the gear to rotate and a reversing valve for controlling the oil inlet direction of the hydraulic motor (1); the oil inlet and the oil return port of the reversing valve are respectively connected to the system oil supply and the system oil return; the two working oil ports of the reversing valve are respectively connected to the forward oil port (A) and the reverse oil port (B) of the hydraulic motor (1); the system oil supply is also separately connected to the reverse oil port (B) of the hydraulic motor (1) through a control valve (3); when the shield machine changes pipes, the control valve (3) is closed to block the system oil supply from entering the reverse oil port (B) through the control valve (3); when the shield machine is excavating, the control valve (3) is opened to allow the system oil supply to enter the reverse oil port (B) through the control valve (3); A balancing valve (6) is arranged between the reversing valve and the hydraulic motor (1), the balancing valve (6) comprising two valve groups respectively arranged on two oil paths between the reversing valve and the hydraulic motor (1), each of the valve groups comprising a one-way valve channel and a relief valve channel, and the relief valve channels of the two valve groups are connected and controlled to each other; An oil replenishment pressure reducing valve (7) is provided between the system oil supply and the control valve (3) for limiting the oil replenishment pressure of the hydraulic motor (1) when the shield pipeline extension mechanism is passively retreated. The forward oil port (A) of the hydraulic motor (1) is also connected to the system return oil via a relief valve (8) for limiting the return oil back pressure of the hydraulic motor (1) when the shield pipeline extension mechanism is passively retreated. The opening pressures of the oil replenishment pressure reducing valve (7) and the relief valve (8) are equal, for ensuring that the shield pipeline extension mechanism is absolutely stationary and moves backward relative to the trailer. The two oil ports of the overflow valve (8) are directly connected to the forward oil port (A) of the hydraulic motor (1) and a working oil port of the reversing valve respectively. The overflow valve (8) is connected in parallel with the balance valve (6). When the shield machine is excavating, the hydraulic oil only flows through the overflow valve (8).

2. The shield pipeline extension mechanism pipe replacement hydraulic control system according to claim 1 is characterized in that: The reversing valve is specifically a three-position four-way electromagnetic reversing valve (2). When the shield machine changes pipes, the three-position four-way electromagnetic reversing valve (2) is in a first working position or a second working position, so that the oil inlet of the three-position four-way electromagnetic reversing valve (2) is connected to one of the two working oil ports, and the oil return port of the three-position four-way electromagnetic reversing valve (2) is connected to the other of the two working oil ports.

3. The shield pipeline extension mechanism pipe replacement hydraulic control system according to claim 2 is characterized in that: The middle position function of the three-position four-way electromagnetic reversing valve (2) is Y-shaped. When the shield machine is excavating, the three-position four-way electromagnetic reversing valve (2) is in the middle position, and the two working oil ports of the three-position four-way electromagnetic reversing valve (2) are both connected to the oil return port.

4. The shield pipeline extension mechanism pipe replacement hydraulic control system according to claim 3 is characterized in that: A speed regulating valve (4) is provided between the system oil supply and the reversing valve.

5. The shield pipeline extension mechanism pipe replacement hydraulic control system according to claim 4 is characterized in that: An active pressure reducing valve (5) is provided between the speed regulating valve (4) and the reversing valve.

6. The shield pipeline extension mechanism pipe replacement hydraulic control system according to claim 5, characterized in that: The control valve (3) is specifically an electromagnetic ball valve.

7. A shield machine, characterized in that: It comprises the shield pipeline extension mechanism pipe replacement hydraulic control system as described in any one of claims 1 to 6.

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