Shield stabilizer load change pressure automatic adjusting system and method

Abstract

The invention discloses a shield stabilizer load change pressure automatic adjusting system and method, the system comprises a pressure sensor connected with a stabilizer hydraulic cylinder, a proportional pressure reducing valve and a single throttle valve, and the pressure sensor is connected with an upper computer PLC; a first ball valve is further connected between the hydraulic cylinder and the pressure sensor, and the hydraulic cylinder is used for driving the stabilizer to stretch or retract; the pressure sensor is used for detecting the pressure change in the rodless cavity of the hydraulic cylinder; the proportional pressure reducing valve is used for controlling the pressure entering the valve set and adjusting the pressure in a stepless mode according to an upper computer rotary knob. The one-way throttle valve is used for adjusting the flow entering the hydraulic cylinder so as to control the stretching or retracting speed of the hydraulic cylinder; the pressure is adjusted through the proportional pressure reducing valve, the pressure of a rodless cavity of a hydraulic cylinder of the stabilizer is collected and compared with the actually required pressure, then the pressure of the proportional valve is automatically adjusted, and therefore the pressure of the stabilizer is controlled.

Description

Technical Field

[0001] The present application relates to the technical field of shield machine control, and in particular to a system and method for automatically adjusting the load-changing pressure of a shield stabilizer. Background Art

[0002] In recent years, with the development of mines, rail transit, water diversion projects and urban underground engineering construction, tunnel boring equipment, especially large-scale tunnel boring machines, which have the advantages of high efficiency, low pollution and safety, are increasingly favored by construction units. The shield body of the shield machine, as an indispensable and important part of tunnel boring equipment, is an important bearing platform for the thrust cylinder, articulated cylinder and stabilizer. The stability during the construction process determines the performance and efficiency of the shield machine. During the normal construction and excavation process, the main drive drives the cutterhead to rotate, and the shield stabilizer needs to form a force with the tunnel wall to overcome the reaction force of the cutterhead rotation. In this way, the pressure control of the shield stabilizer becomes very important.

[0003] Since shield machines often face complex and changeable geology, the whole building is subject to great impact during construction. The reliable contact between the shield stabilizer and the tunnel wall can reduce the rotation of the shield and increase the stability of the shield machine during excavation. At present, the shield stabilizer control valve group of the shield machine consists of a pressure reducing valve, an electromagnetic reversing valve and a balancing valve. The pressure of the stabilizer cylinder is manually adjusted by the pressure reducing valve, which depends on the experience of the workers and is difficult to guarantee accuracy. Summary of the invention

[0004] The present application provides a shield stabilizer load change pressure automatic adjustment system and method to solve the above problems.

[0005] On the one hand, the present application provides a shield stabilizer load change pressure automatic adjustment system, characterized in that the system includes a pressure sensor, a proportional pressure reducing valve, and a one-way throttle valve connected to the stabilizer hydraulic cylinder, the pressure sensor is connected to the upper computer PLC; a first ball valve is also connected between the hydraulic cylinder and the pressure sensor, and the hydraulic cylinder is used to drive the extension or retraction of the stabilizer; the pressure sensor is used to detect the pressure change in the rodless cavity of the hydraulic cylinder; the proportional pressure reducing valve is used to control the pressure entering the valve group, and steplessly adjust the pressure according to the upper computer knob; the one-way throttle valve is used to adjust the flow entering the hydraulic cylinder, thereby controlling the extension or retraction speed of the hydraulic cylinder; the pressure is adjusted by the proportional pressure reducing valve, the rodless cavity pressure of the stabilizer hydraulic cylinder is collected and compared with the actual required pressure, and then the pressure of the proportional valve is automatically adjusted to control the pressure of the stabilizer.

[0006] In one implementation of the present application, the system further includes a second ball valve connected to the proportional pressure reducing valve, and the second ball valve is used to control the high-pressure oil entering the entire hydraulic valve group.

[0007] In one implementation of the present application, the system further includes a balancing valve and an electromagnetic reversing valve, wherein the balancing valve is used to ensure smooth operation of the hydraulic cylinder, and the electromagnetic reversing valve is used to control the extension and retraction of the hydraulic cylinder.

[0008] In one implementation of the present application, the system generates an output proportional to its input signal by adjusting the proportional pressure reducing valve, and is remotely adjusted and controlled by an electronic device.

[0009] In one implementation of the present application, the process of proportional control is specifically as follows:

[0010] The input signal current is supplied to the control amplifier, and after passing through the amplifier, the output signal drives the electromagnet to operate, and the electromagnet drives the valve core until the feedback signal from the position sensor corresponds to the command signal.

[0011] The present application also provides a method for automatically adjusting the pressure of a shield stabilizer under load changes, using the aforementioned automatic pressure adjustment system for a shield stabilizer under load changes, the method comprising the following steps:

[0012] Step S1: Open the first ball valve and the second ball valve to allow the high-pressure oil from the auxiliary system to enter the proportional pressure reducing valve;

[0013] Step S2: adjusting the magnitude of the control current received by the proportional pressure reducing valve;

[0014] Step S3: Input the target pressure value to enable the proportional pressure reducing valve to automatically adjust the pressure.

[0015] In one implementation of the present application, step S2 specifically includes: adjusting the pressure adjustment knob of the host computer so that the proportional pressure reducing valve amplifier receives the change of the control current, thereby changing the pressure entering the electromagnetic reversing valve, and the pressure sensor feeds back the real-time pressure value of the hydraulic cylinder.

[0016] In one implementation of the present application, the method further includes: based on a PLC editable controller, by collecting feedback values ​​from a pressure sensor, adjusting the control current of the proportional pressure reducing valve, and inputting a target pressure value, so that the proportional pressure reducing valve automatically adjusts the pressure value to a desired value.

[0017] In one implementation of the present application, the proportional pressure reducing valve input signal current is supplied to the control amplifier, and the output signal after passing through the amplifier drives the electromagnet to operate, and the electromagnet drives the valve core until the feedback signal from the position sensor corresponds to the command signal.

[0018] The present application provides a shield stabilizer load change pressure automatic adjustment system and method, which generates an output proportional to its input signal by adjusting the proportional pressure reducing valve, and can be remotely adjusted and controlled by an electronic device, thereby realizing a shield stabilizer pressure automatic adjustment method, and providing a basis for shield machine stable excavation stabilizer pressure control. This method has the advantages of being simple, safe, convenient, and reliable, and has practical guiding significance in the field of shield machine tunnel excavation equipment stabilizer control. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0020] Figure 1 A composition diagram of a shield stabilizer load change pressure automatic adjustment system provided in an embodiment of the present application;

[0021] Figure 2 A flow chart of a method for automatically adjusting the pressure of a shield stabilizer under load variation provided in an embodiment of the present application;

[0022] Figure 3 A schematic diagram of the proportional control working principle provided in the embodiment of the present application;

[0023] Reference numerals: hydraulic cylinder 1 , first ball valve 2 , pressure sensor 3 , second ball valve 4 , proportional pressure reducing valve 5 , balancing valve 6 , one-way throttle valve 7 , solenoid reversing valve 8 . DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0025] The embodiment of the present application provides a system and method for automatically adjusting the load-changing pressure of a shield stabilizer. The technical solution proposed in the embodiment of the present application is described in detail below with reference to the accompanying drawings.

[0026] Figure 1 This is a diagram of the composition of a shield stabilizer load change pressure automatic adjustment system provided in an embodiment of the present application. Figure 1As shown in the schematic diagram of the proportional control hydraulic principle of the shield machine stabilizer, the hydraulic cylinder 1 drives the extension or retraction of the stabilizer. When the stabilizer is extended, it contacts the tunnel wall. As the hydraulic cylinder extends, the pressure gradually increases, and the stabilizer acts stably on the tunnel wall. The first ball valve 2 can control the hydraulic oil entering the stabilizer hydraulic cylinder. The pressure sensor 3 is used to detect the pressure change in the rodless cavity of the hydraulic cylinder, and the detected pressure value can be transmitted online to the host computer PLC in real time. The second ball valve 4 controls the high-pressure oil entering the entire hydraulic valve group. The proportional pressure reducing valve 5 can accurately control the pressure entering the valve group, and can adjust the pressure steplessly according to the knob of the host computer. The balance valve 6 can make the hydraulic cylinder run smoothly. The one-way throttle valve 7 can adjust the flow entering the hydraulic cylinder, thereby controlling the extension or retraction speed of the hydraulic cylinder. The electromagnetic reversing valve 8 controls the extension and retraction of the hydraulic cylinder 1.

[0027] Specific operation steps: First, open the second ball valve 4 and the first ball valve 2 to let the high-pressure oil from the auxiliary system enter the proportional pressure reducing valve 5. One way is to manually adjust the pressure adjustment knob of the upper computer, and the proportional pressure reducing valve amplifier receives the change of the control current, thereby changing the pressure entering the electromagnetic reversing valve 8. The pressure sensor 3 feeds back the real-time pressure value of the hydraulic cylinder to provide a reference for adjusting the target pressure value; another way is to use a PLC editable controller and adopt an algorithm to collect the feedback value of the pressure sensor, so as to automatically adjust the control current of the proportional pressure reducing valve, so as to realize the input target pressure, the proportional pressure reducing valve automatically adjusts the pressure, and realizes the automatic adjustment of the pressure of the shield stabilizer load change.

[0028] The present application also provides a method for automatically adjusting the load-changing pressure of a shield stabilizer. Figure 2 As shown, the following steps are included:

[0029] Step S1: Open the first ball valve and the second ball valve to allow the high-pressure oil from the auxiliary system to enter the proportional pressure reducing valve;

[0030] Step S2: adjusting the magnitude of the control current received by the proportional pressure reducing valve;

[0031] Step S3: Input the target pressure value to enable the proportional pressure reducing valve to automatically adjust the pressure.

[0032] In the embodiment of the present application, step S2 specifically includes: adjusting the pressure adjustment knob of the host computer so that the proportional pressure reducing valve amplifier receives the change of the control current, thereby changing the pressure entering the electromagnetic reversing valve, and the pressure sensor feeds back the real-time pressure value of the hydraulic cylinder.

[0033] In an embodiment of the present application, the method also includes: based on a PLC editable controller, by collecting feedback values ​​from a pressure sensor, adjusting the control current of the proportional pressure reducing valve, and inputting a target pressure value, so that the proportional pressure reducing valve automatically adjusts the pressure value to a desired value.

[0034] In one implementation of the present application, the proportional pressure reducing valve input signal current is supplied to the control amplifier, and after passing through the amplifier, the output signal drives the electromagnet to operate, and the electromagnet drives the valve core until the feedback signal from the position sensor corresponds to the command signal. The process diagram is shown in FIG. Figure 3 shown.

[0035] The present application provides a shield stabilizer load change pressure automatic adjustment system and method, which generates an output proportional to its input signal by adjusting the proportional pressure reducing valve, and can be remotely adjusted and controlled by an electronic device, thereby realizing a shield stabilizer pressure automatic adjustment method, and providing a basis for shield machine stable excavation stabilizer pressure control. This method has the advantages of being simple, safe, convenient, and reliable, and has practical guiding significance in the field of shield machine tunnel excavation equipment stabilizer control.

[0036] Each embodiment in this application is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0037] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0038] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A shield stabilizer load change pressure automatic adjustment system, characterized in that: The system includes a pressure sensor, a proportional pressure reducing valve, and a one-way throttle valve connected to the stabilizer hydraulic cylinder, the pressure sensor is connected to the upper computer PLC; a first ball valve is also connected between the hydraulic cylinder and the pressure sensor, and the hydraulic cylinder is used to drive the extension or retraction of the stabilizer; the pressure sensor is used to detect the pressure change in the rodless cavity of the hydraulic cylinder; the proportional pressure reducing valve is used to control the pressure entering the valve group and adjust the pressure steplessly according to the upper computer knob; the one-way throttle valve is used to adjust the flow entering the hydraulic cylinder, thereby controlling the extension or retraction speed of the hydraulic cylinder; the pressure is adjusted by the proportional pressure reducing valve, the pressure of the rodless cavity of the stabilizer hydraulic cylinder is collected and compared with the actual required pressure, and then the pressure of the proportional valve is automatically adjusted to control the pressure of the stabilizer.

2. The shield stabilizer load change pressure automatic adjustment system according to claim 1, characterized in that: The system further comprises a second ball valve connected to the proportional pressure reducing valve, wherein the second ball valve is used to control the high-pressure oil entering the entire hydraulic valve group.

3. The shield stabilizer load change pressure automatic adjustment system according to claim 1, characterized in that: The system further comprises a balancing valve and an electromagnetic reversing valve, wherein the balancing valve is used to make the hydraulic cylinder run smoothly, and the electromagnetic reversing valve is used to control the extension and retraction of the hydraulic cylinder.

4. The shield stabilizer load change pressure automatic adjustment system according to claim 1, characterized in that: The system produces an output proportional to its input signal by adjusting the proportional pressure reducing valve and is remotely controlled by electronic devices.

5. The shield stabilizer load change pressure automatic adjustment system according to claim 4, characterized in that: The process of proportional control is as follows: The input signal current is supplied to the control amplifier, and after passing through the amplifier, the output signal drives the electromagnet to operate, and the electromagnet drives the valve core until the feedback signal from the position sensor corresponds to the command signal.

6. A method for automatically adjusting the pressure of a shield stabilizer under load changes, using a system for automatically adjusting the pressure of a shield stabilizer under load changes as claimed in any one of claims 1 to 5, characterized in that: The method comprises the following steps: Step S1: Open the first ball valve and the second ball valve to allow the high-pressure oil from the auxiliary system to enter the proportional pressure reducing valve; Step S2: adjusting the magnitude of the control current received by the proportional pressure reducing valve; Step S3: Input the target pressure value to enable the proportional pressure reducing valve to automatically adjust the pressure.

7. A method for automatically adjusting the load-changing pressure of a shield stabilizer according to claim 6, characterized in that: The step S2 specifically includes: adjusting the upper computer pressure adjustment knob so that the proportional pressure reducing valve amplifier receives the change of the control current, thereby changing the pressure entering the electromagnetic reversing valve, and the pressure sensor feeds back the real-time pressure value of the hydraulic cylinder.

8. A method for automatically adjusting the load-changing pressure of a shield stabilizer according to claim 7, characterized in that: The method further comprises: based on a PLC editable controller, by collecting feedback values ​​of pressure sensors, adjusting the control current of the proportional pressure reducing valve, inputting a target pressure value, and allowing the proportional pressure reducing valve to automatically adjust the pressure value to a desired value.

9. The method for automatically adjusting the load-changing pressure of a shield stabilizer according to claim 6, characterized in that: The proportional pressure reducing valve input signal current is supplied to the control amplifier, and the output signal after passing through the amplifier drives the electromagnet to operate, and the electromagnet drives the valve core until the feedback signal from the position sensor corresponds to the command signal.

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