A bidirectional lockout fluid circuit and tunneling apparatus

Abstract

The utility model belongs to the field of fluid system, specifically provides a kind of two-way locking fluid circuit and tunnel construction equipment.The circuit is equipped with control valve group on the connecting pipeline of each actuator working port and corresponding main valve interface, control valve group includes check valve and solenoid valve, check valve includes valve body and piston type valve core, valve core separates valve body into valve cavity e, valve cavity d and valve cavity c, solenoid valve is communicated with valve cavity d and valve cavity e, and is equipped with medium outlet, valve cavity c is communicated with main valve, valve cavity d is communicated with actuator, control solenoid valve is switched on / off valve cavity e to medium outlet conduction and valve cavity d to valve cavity e conduction, to control whether check valve can be opened reversely.The equipment includes the above-mentioned circuit.In implementation, the utility model can guarantee that the slagging arm is suspended stability in 360 ° rotation process at any position, and the on-off of check valve is indirectly controlled by solenoid valve electric signal, compared with the response speed of the circuit using hydraulic pilot control is fast.

Description

Technical Field

[0001] This utility model belongs to the field of fluid systems, and in particular relates to a bidirectional closed fluid circuit and tunnel construction equipment. Background Technology

[0002] In water conservancy and hydropower projects, inclined shaft excavation equipment is commonly used. This equipment is generally equipped with a muck loader, mainly used for muck removal operations. For example, the large-angle inclined shaft enlargement and muck removal construction equipment disclosed in invention patent application CN119466857A. This muck loader has a bucket at the end equipped with a series of boom cylinders, stick cylinders, bucket cylinders, and a slewing reducer to give the bucket sufficient degrees of freedom.

[0003] Because the structure of a muck loader is similar to that of an excavator arm, the control system of the excavator arm is often directly adopted. However, the excavator arm always operates vertically, and the hydraulic cylinder only bears a unidirectional load, mostly using a hydraulically controlled unidirectional arm seat circuit. In contrast, the muck loader needs to rotate 360° under certain working conditions, and the hydraulic cylinder bears a bidirectional load. Directly using the control system of the excavator arm cannot meet the requirements of these working conditions. Utility Model Content

[0004] The purpose of this invention is to provide a bidirectional closed-loop fluid circuit to solve the technical problem that existing hydraulic circuits cannot meet the needs of the muck-loading arm. Another purpose of this invention is to provide a tunnel construction device to solve the same technical problem.

[0005] To achieve the above objectives, the technical solution for the bidirectional interlocking fluid circuit provided by this utility model is as follows: A bidirectional closed fluid circuit includes a main valve and an actuator. The actuator has a first working port and a second working port. The main valve has a first interface and a second interface, which are respectively connected to the first and second working ports. A control valve assembly is provided on the connecting pipelines of each working port and the corresponding interface. The control valve assembly includes a check valve and a solenoid valve. The check valve includes a valve body and a piston-type valve core. The valve core divides the valve body into valve chamber e, valve chamber d, and valve chamber c. The solenoid valve is connected to valve chamber d and valve chamber e and has a medium outlet. Valve chamber c is connected to the main valve, and valve chamber d is connected to the actuator. The solenoid valve is controlled to switch the conduction from valve chamber e to the medium outlet and from valve chamber d to valve chamber e by being energized / de-energized, so as to control whether the check valve can be opened in reverse.

[0006] As a further improvement, the solenoid valve is an electro-proportional control valve.

[0007] As a further improvement, the solenoid valve is a two-point control valve.

[0008] As a further improvement, the main valve is an electro-proportional multi-way valve or a solenoid directional valve.

[0009] As a further improvement, the actuator is a hydraulic actuator, and the medium outlet of the solenoid valve is connected to a return oil tank.

[0010] This utility model is an improved invention, and its beneficial effects are: the fluid circuit is equipped with control valve groups in the flow path between the two working ports of the actuator and the two interfaces of the main valve, which can ensure that the actuator has high stability regardless of its state. At the same time, the electronic control method can improve the system's responsiveness.

[0011] Specifically, taking the cutting arm of a deflector applied to a deflector in a slant shaft construction equipment as an example, the actuator here refers to the boom cylinder. The first working port and the second working port correspond to the rodless chamber port and the rod chamber port of the boom cylinder, respectively. When the piston rod of the boom cylinder needs to extend, the first port of the main valve feeds oil into the rodless chamber. At this time, the check valve on the connecting pipeline between the first port and the rodless chamber port is in a forward-biased state, and the check valve on the connecting pipeline between the second port and the rod chamber is in a reverse-biased state, with oil returning from the rod chamber. In order to enable this check valve to reverse-biased conduction, the corresponding solenoid valve can be energized (or de-energized) to make the valve chamber e open to the medium outlet, thereby allowing the oil in the valve chamber e to return and depressurize. When the piston rod of the boom cylinder retracts, the process is the opposite of when the piston rod extends.

[0012] When the slag removal arm is in a stationary state with the boom arm facing upward, the rodless chamber of the boom cylinder is pressurized. At this time, the solenoid valve on the oil port of the rodless chamber and the first interface connecting pipeline is de-energized (or energized), so that valve chamber e and valve chamber d are connected, the two valve chambers are balanced, the solenoid valve cannot be opened in reverse, and it is in a locked state. When the slag removal arm is facing downwards and stationary, the rod chamber of the boom cylinder is pressurized. At this time, the solenoid valve on the connecting pipe between the rod chamber oil port and the second interface is de-energized (or energized), so that valve chamber e and valve chamber d are connected. The two valve chambers are balanced, and the solenoid valve cannot be opened in reverse and is in a locked state.

[0013] As can be seen from the above introduction, configuring the fluid circuit provided by this utility model for the boom cylinder can ensure the stability of the slag removal boom when hovering at any position during 360° rotation, and the opening and closing of the one-way valve is indirectly controlled by the electromagnetic valve electrical signal, which has a faster response speed compared to the circuit using hydraulic pilot control.

[0014] To achieve the above objectives, the technical solution for the tunnel construction equipment provided by this utility model is as follows: A tunnel construction device includes a fluid power system comprising a fluid circuit, which includes a main valve and an actuator. The actuator has a first working port and a second working port. The main valve has a first interface and a second interface, which are respectively connected to the first and second working ports. A control valve assembly is provided on the connecting pipelines of each working port and the corresponding interface. The control valve assembly includes a check valve and a solenoid valve. The check valve includes a valve body and a piston-type valve core. The valve core divides the valve body into valve chamber e, valve chamber d, and valve chamber c. The solenoid valve is connected to valve chamber d and valve chamber e and has a medium outlet. Valve chamber c is connected to the main valve, and valve chamber d is connected to the actuator. The solenoid valve is controlled to switch the conduction from valve chamber e to the medium outlet and from valve chamber d to valve chamber e by being energized / de-energized, thereby controlling whether the check valve can be opened in reverse.

[0015] As a further improvement, the solenoid valve is an electro-proportional control valve.

[0016] As a further improvement, the solenoid valve is a two-point control valve.

[0017] As a further improvement, the main valve is an electro-proportional multi-way valve or a solenoid directional valve.

[0018] As a further improvement, the actuator is a hydraulic actuator, and the medium outlet of the solenoid valve is connected to a return oil tank.

[0019] This utility model is an improved invention, and its beneficial effects are: the fluid circuit is equipped with control valve groups in the flow path between the two working ports of the actuator and the two interfaces of the main valve, which can ensure that the actuator has high stability regardless of its state. At the same time, the electronic control method can improve the system's responsiveness.

[0020] Specifically, taking the cutting arm of a deflector applied to a deflector in a slant shaft construction equipment as an example, the actuator here refers to the boom cylinder. The first working port and the second working port correspond to the rodless chamber port and the rod chamber port of the boom cylinder, respectively. When the piston rod of the boom cylinder needs to extend, the first port of the main valve feeds oil into the rodless chamber. At this time, the check valve on the connecting pipeline between the first port and the rodless chamber port is in a forward-biased state, and the check valve on the connecting pipeline between the second port and the rod chamber is in a reverse-biased state, with oil returning from the rod chamber. In order to enable this check valve to reverse-biased conduction, the corresponding solenoid valve can be energized (or de-energized) to make the valve chamber e open to the medium outlet, thereby allowing the oil in the valve chamber e to return and depressurize. When the piston rod of the boom cylinder retracts, the process is the opposite of when the piston rod extends.

[0021] When the slag removal arm is in a stationary state with the boom arm facing upward, the rodless chamber of the boom cylinder is pressurized. At this time, the solenoid valve on the oil port of the rodless chamber and the first interface connecting pipeline is de-energized (or energized), so that valve chamber e and valve chamber d are connected, the two valve chambers are balanced, the solenoid valve cannot be opened in reverse, and it is in a locked state. When the slag removal arm is facing downwards and stationary, the rod chamber of the boom cylinder is pressurized. At this time, the solenoid valve on the connecting pipe between the rod chamber oil port and the second interface is de-energized (or energized), so that valve chamber e and valve chamber d are connected. The two valve chambers are balanced, and the solenoid valve cannot be opened in reverse and is in a locked state.

[0022] As can be seen from the above introduction, configuring the fluid circuit provided by this utility model for the boom cylinder can ensure the stability of the slag removal boom when hovering at any position during 360° rotation, and the opening and closing of the one-way valve is indirectly controlled by the electromagnetic valve electrical signal, which has a faster response speed compared to the circuit using hydraulic pilot control. Attached Figure Description

[0023] Figure 1 This is a simplified schematic diagram of the bidirectional closed fluid circuit implementation method in this utility model; Figure 2 for Figure 1 Enlarged schematic diagram of the central control valve assembly; Figure 3 for Figure 1 A simplified schematic diagram of a one-way valve.

[0024] Explanation of reference numerals in the attached figures: 1. Main valve; 2. First solenoid valve; 3. First check valve; 4. Second solenoid valve; 5. Second check valve; 6. Boom cylinder. Detailed Implementation

[0025] Tunnel construction involves multiple processes, such as excavation, muck removal, and initial support. To reduce labor intensity and improve operational safety, it is essential to develop corresponding tunnel construction equipment for each process. For example, in water conservancy and hydropower projects, for large-section inclined shafts, the current common method is to excavate pilot tunnels from top to bottom, requiring the use of corresponding inclined shaft construction equipment. This equipment is equipped with a muck-removing robotic arm (referred to as a muck-removing arm). The basic structure of the muck-removing arm is basically the same as that of an excavator arm, and it currently also uses the same hydraulic flow path as the excavator arm. However, unlike the excavator arm, the muck-removing arm deals with more complex working conditions, and the hydraulic flow path used by the excavator arm cannot meet the safe operation requirements of the muck-removing arm.

[0026] To address the aforementioned problems, the basic concept of this utility model is to install one-way valves on the connecting pipelines (i.e., oil circuits) from the two working ports of the boom cylinder to the two interfaces of the main valve. Each one-way valve is equipped with a solenoid valve to control whether it can be opened in reverse. Under normal circumstances, each oil circuit operates normally to meet the operational needs of the slag removal arm. When the slag removal arm needs to be suspended and waiting, regardless of which chamber of the boom cylinder is pressurized, the one-way valve can be controlled to a locked state that cannot be opened in reverse by controlling the solenoid valve, ensuring the stable operation of the slag removal arm and meeting its operational requirements.

[0027] Based on the above concept, the present invention will be further described in detail below with reference to the embodiments.

[0028] Specific implementation of the bidirectional locked fluid circuit provided by this utility model: As a typical embodiment, for ease of understanding, it is first described here as follows: Figure 1 and Figure 2 The diagram shows the hydraulic circuit configured for boom cylinder 6 as an example. The structural components of the bidirectional lock-up fluid (hydraulic) circuit are described below: The fluid circuit includes a main valve 1 and an actuator. An actuator is a component that can output an action under the drive of a high-pressure fluid medium. In this embodiment, the actuator is a boom cylinder 6. The boom cylinder 6 can control the pitching and swinging of the slag-removing arm. When the slag-removing arm is facing upward, the rodless chamber of the boom cylinder 6 is pressurized. When the slag-removing arm is facing downward, the rod chamber of the boom cylinder 6 is pressurized.

[0029] The boom cylinder 6 has two working ports: a rodless chamber port leading to the rodless chamber and a rod chamber port leading to the rod chamber. Correspondingly, the main valve 1 also has two interfaces, A and B, as shown in the figure. Port A is connected to the rod chamber port via a pipeline, and port B is connected to the rodless chamber via a pipeline. Specifically, if the piston rod needs to extend, oil enters the rodless chamber through port B, and the hydraulic oil in the rod chamber returns to port A; if the piston rod needs to retract, oil enters the rod chamber through port A, and the hydraulic oil in the rodless chamber returns to port B.

[0030] Unlike existing technologies, control valve assemblies are installed on the connecting pipelines of port A and the rod-side port, and on the connecting pipelines of port B and the rodless-side port. Each control valve assembly includes a check valve and a solenoid valve. For ease of description, the check valve and solenoid valve on the connecting pipeline of port B and the rodless-side port can be defined as the first check valve 3 and the first solenoid valve 2, respectively, and the check valve and solenoid valve on the connecting pipeline of port A and the rod-side port can be defined as the second check valve 5 and the second solenoid valve 4, respectively. The forward conduction direction of each check valve is configured to flow from the main valve 1 to the corresponding port. The corresponding solenoid valve is used to control whether the check valve can be opened in reverse.

[0031] like Figure 3 As shown, the one-way valve includes a valve body and a valve core. The valve core has a piston structure and can divide the valve body into three valve chambers: valve chamber e, valve chamber d, and valve chamber c. The solenoid valve has different interfaces. Specifically, the solenoid valve has an interface that communicates with valve chamber d and an interface that communicates with valve chamber e. The solenoid valve also has a medium outlet and a return oil tank is connected to the medium outlet.

[0032] The solenoid valve has different operating positions, which can be switched by controlling the solenoid valve to be energized and de-energized. Specifically, the operating positions include the position where valve chamber e is connected to the medium outlet, in which case the oil in valve chamber e can flow back to the oil tank, thereby allowing the valve core to be opened in reverse; the operating position also includes the position where valve chamber e and valve chamber d are connected, in which valve chamber e is connected to the rodless chamber (or rod chamber) of the boom cylinder 6 through valve chamber d, the cylinder maintains pressure, and the valve core cannot be opened in reverse.

[0033] The main valve 11 can also be an electrically controlled directional valve (i.e., a solenoid directional valve), which includes coil a and coil b. When coil a is energized, the main valve 1 core is in position a, and oil is discharged from port A. When coil b is energized, the main valve 1 core is in position b, and oil is discharged from port B.

[0034] The following is a brief explanation of the specific working principles of this embodiment, taking the scheme in which the oil in the valve chamber e can flow back to the oil tank when the solenoid valve is energized as an example.

[0035] Control logic: The coil a of the main valve 1 and the first solenoid valve 2 are simultaneously energized / de-energized, and the coil b of the main valve 1 and the second solenoid valve 4 are simultaneously energized / de-energized.

[0036] Specific process: When the slag removal arm is in a stationary state with the top facing up, the rodless chamber of the boom cylinder 6 is pressurized. At this time, the first solenoid valve 2 is de-energized and is in the lower position due to the action of the spring. At this time, the oil in the rodless chamber of the boom cylinder 6 is connected to the valve chamber e of the first one-way valve 3 through the valve chamber d of the first one-way valve 3 and the first solenoid valve 2. The first one-way valve 3 is closed, and the rodless chamber of the boom cylinder 6 is pressurized and in a locked state. When the slag removal arm is facing downwards and in a stationary state, the rod chamber of the boom cylinder 6 is pressurized. At this time, the second solenoid valve 4 is de-energized and, under the action of the spring, the second solenoid valve 4 is in the lower position. At this time, the oil in the rod chamber of the boom cylinder 6 is connected to the valve chamber e of the second check valve 5 through the valve chamber d of the second check valve 5 and the second solenoid valve 4. The second check valve 5 is closed, and the rod chamber of the boom cylinder 6 is pressurized and in a locked state. When the hydraulic cylinder needs to extend, the coil b of the main valve 1 is energized, oil flows out from port B, and the pressurized oil acts on the valve chamber c of the first check valve 3, thereby opening the first check valve 3. At this time, the oil enters the rodless chamber of the hydraulic cylinder. The oil in the rod chamber of the hydraulic cylinder enters the valve chamber d of the second check valve 5. Because the second solenoid valve 4 is energized and in the upper position, the valve chamber e of the second check valve 5 is connected to the return oil through the second solenoid valve 4. At this time, the pressure in valve chamber d is greater than the pressure in valve chamber e, the valve core of the second check valve 5 is opened, and the oil in the rod chamber of the hydraulic cylinder flows out through valve chambers d and c, and the hydraulic cylinder begins to extend. When the hydraulic cylinder needs to retract, coil a of main valve 1 is energized, oil flows out from port A, and the pressurized oil acts on valve chamber c of the second check valve 5, thereby opening the second check valve 5. At this time, the oil enters the rod chamber of the hydraulic cylinder. The oil in the rodless chamber of the hydraulic cylinder enters valve chamber d of the first check valve 33. Because the first solenoid valve 2 is energized and in the upper position, the valve chamber e of the first check valve 3 is connected to the return oil through the first solenoid valve 2. At this time, the pressure in valve chamber d is greater than the pressure in valve chamber e, the valve core of the first check valve 3 is opened, and the oil in the rodless chamber of the hydraulic cylinder flows out through valve chambers d and c, and the hydraulic cylinder begins to retract.

[0037] When the slag removal arm is in the upper position, if the main valve 1 or the pump source fails and cannot be used, the first solenoid valve 2 can be energized, and the slag removal arm will be lowered by gravity in an emergency, which can avoid affecting other processes.

[0038] In summary, this embodiment can achieve electronic control and bidirectional interlocking, ensuring the stability of the excavator arm at any position under 360° rotation. It can also be used as an emergency valve to lower the excavator arm by its own weight. Furthermore, the interlocking circuit uses electronic control to link with the main valve 1, ensuring coordinated action and agile response. Compared to the unidirectional interlocking circuit used in excavator systems, it has wider applicability; compared to the pressure-holding method of the balance valve, it is more agile; and compared to the hydraulic interlocking circuit, it is faster and safer.

[0039] In some preferred embodiments, both the first solenoid valve 2 and the second solenoid valve 4 can be electro-proportional control valves, which can precisely control the flow rate and pressure of the solenoid valves in the two working positions.

[0040] In some alternative implementations, both the first solenoid valve 2 and the second solenoid valve 4 can be two-point solenoid control valves, which reduces costs while still meeting basic functional requirements.

[0041] Similarly, in addition to using a solenoid directional valve, the main valve 1 can also be an electro-proportional multi-way valve.

[0042] The above provides a typical hydraulic circuit embodiment. However, it should be noted that in other embodiments, the fluid circuit can also be used in a pneumatic system. Some tunnel construction equipment is equipped with cylinders as actuators. To ensure the reliable operation of the cylinders, the same fluid circuit can also be used. Since the cylinders use compressed air as the fluid medium, a return oil tank is not required. The medium outlet of the solenoid valve can directly supply the gas that has completed its work to be discharged.

[0043] In addition, in other embodiments, the fluid circuit can also be used for rotary actuators that can output speed / torque, such as hydraulic motors. In order to enable the robotic arm to cover a larger range, most tunnel construction equipment is actually equipped with a slewing base to allow the robotic arm to rotate 360°. Hydraulic motors are commonly used rotary power sources. In this case, the two working ports are the two oil ports of the hydraulic motor, so that the hydraulic motor can maintain a relatively reliable and stable state regardless of whether it is stationary.

[0044] Similarly, in other embodiments, if the actuator is a pneumatic motor, the fluid circuit is also applicable and has the same technical effect.

[0045] Specific implementation method of the tunnel construction equipment in this utility model: The tunnel construction equipment is equipped with a fluid power system, which can be a pneumatic system or a hydraulic system. The fluid power system includes a fluid circuit with the same implementation method as the bidirectional interlocking fluid circuit described above, which will not be described in detail here. Specifically, the tunnel construction equipment is not limited to inclined shaft excavation equipment. It can be equipment with multi-degree-of-freedom robotic arms, such as rock drilling rigs and arch frame rigs, or equipment such as the slag removal mechanism and anchor bolt arm configured on a full-face tunnel boring machine. As long as it uses hydraulic or pneumatic actuators, the bidirectional interlocking fluid circuit provided by this utility model can be used.

[0046] Finally, it should be noted that the above description is only a preferred embodiment of this utility model and is not intended to limit this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A bidirectional closed-loop fluid circuit, comprising a main valve and an actuator, the actuator having a first working port and a second working port, the main valve having a first interface and a second interface, respectively connected to the first and second working ports, characterized in that, Control valve assemblies are installed on the connecting pipelines of each working port and corresponding interface. The control valve assembly includes a check valve and a solenoid valve. The check valve includes a valve body and a piston-type valve core. The valve core divides the valve body into valve chamber e, valve chamber d, and valve chamber c. The solenoid valve is connected to valve chamber d and valve chamber e and has a medium outlet. Valve chamber c is connected to the main valve, and valve chamber d is connected to the actuator. The solenoid valve is controlled to switch the conduction from valve chamber e to the medium outlet and from valve chamber d to valve chamber e by being energized / de-energized, so as to control whether the check valve can be opened in reverse.

2. The bidirectional interlocking fluid circuit according to claim 1, characterized in that, The solenoid valve is an electro-proportional control valve.

3. The bidirectional interlocking fluid circuit according to claim 1, characterized in that, The solenoid valve is a two-point control valve.

4. The bidirectional interlocking fluid circuit according to any one of claims 1-3, characterized in that, The main valve is an electro-proportional multi-way valve or a solenoid directional valve.

5. The bidirectional interlocking fluid circuit according to any one of claims 1-3, characterized in that, The actuator is a hydraulic actuator, and the medium outlet of the solenoid valve is connected to a return oil tank.

6. Tunnel construction equipment, equipped with a fluid power system, which includes a fluid circuit comprising a main valve and an actuator. The actuator has a first working port and a second working port, and the main valve has a first interface and a second interface, respectively connected to the first and second working ports. The characteristic of this equipment is that... Control valve assemblies are installed on the connecting pipelines of each working port and corresponding interface. The control valve assembly includes a check valve and a solenoid valve. The check valve includes a valve body and a piston-type valve core. The valve core divides the valve body into valve chamber e, valve chamber d, and valve chamber c. The solenoid valve is connected to valve chamber d and valve chamber e and has a medium outlet. Valve chamber c is connected to the main valve, and valve chamber d is connected to the actuator. The solenoid valve is controlled to switch the conduction from valve chamber e to the medium outlet and from valve chamber d to valve chamber e by being energized / de-energized, so as to control whether the check valve can be opened in reverse.

7. The tunnel construction equipment according to claim 6, characterized in that, The solenoid valve is an electro-proportional control valve.

8. The tunnel construction equipment according to claim 6, characterized in that, The solenoid valve is a two-point control valve.

9. The tunnel construction equipment according to any one of claims 6-8, characterized in that, The main valve is an electro-proportional multi-way valve or a solenoid directional valve.

10. The tunnel construction equipment according to any one of claims 6-8, characterized in that, The actuator is a hydraulic actuator, and the medium outlet of the solenoid valve is connected to a return oil tank.

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