Pressure regulating system and method for high-pressure chemical grouting

Abstract

The invention relates to a pressure regulating system and method for high-pressure chemical grouting, and belongs to the technical field of pressure control of chemical grouting pumps, and the system comprises a displacement sensor which is used for obtaining the initial displacement between a valve element of a pressure regulating valve and the tail end of a threaded rod and sending the initial displacement to a PLC; the pressure sensor is used for acquiring the pipeline pressure between the pressure regulating valve and the chemical irrigation pump and sending the pipeline pressure to the PLC; the PLC is used for sending the initial displacement and the pipeline pressure to the upper computer; the upper computer is in communication connection with the PLC and used for determining the target displacement of the valve element, determining the pulse number of the motor based on the target displacement and the initial displacement, generating a control instruction based on the pulse number and sending the control instruction to the PLC. The driver is connected with the PLC and used for controlling the motor to operate based on the control instruction, and the motor drives the pressure regulating valve to regulate the valve element to move to the target position through the threaded rod. The pressure control device has the technical effects of accurate pressure control and high stability.

Description

Technical Field

[0001] The invention relates to the technical field of pressure control of chemical grouting pumps, and in particular to a pressure regulating system for high-pressure chemical grouting. Background Art

[0002] Chemical grouting is a technique of preparing a true solution of certain chemical materials (inorganic or organic materials) and injecting it into the stratum or cracks using a chemical grouting pump or other pressure-delivery equipment to allow it to penetrate, diffuse, gel or solidify, thereby increasing stratum strength, reducing stratum permeability, preventing stratum deformation and repairing cracks in concrete buildings. It is a foundation reinforcement, waterproofing and leak-proofing technology and a concrete defect reinforcement technology.

[0003] The pressure regulation of high-pressure chemical grouting in the prior art relies on manual experience, which leads to the problems of poor dynamic performance and low stability of pressure regulation. Summary of the invention

[0004] In view of this, it is necessary to provide a pressure regulating system and method for high-pressure chemical grouting to solve the problems of poor dynamic performance and low stability of pressure regulating of high-pressure chemical grouting.

[0005] In order to solve the above problems, the present invention provides a pressure regulating system for high-pressure chemical grouting, comprising: A displacement sensor is used to obtain an initial displacement between a valve core of the pressure regulating valve and an end of a threaded rod connected to the valve core, and send the initial displacement to a PLC; A pressure sensor is used to obtain the pipeline pressure between the pressure regulating valve and the chemical grouting pump connected to the pressure regulating valve through a pipeline, and send the pipeline pressure to the PLC; PLC, connected to the displacement sensor and the pressure sensor respectively, for sending the initial displacement and pipeline pressure to the host computer; The upper computer is connected to the PLC for communication, and is used to determine the target displacement of the valve core based on the acquired target control pressure, target slurry-liquid ratio level, and pipeline pressure, determine the number of pulses that the motor needs to execute when the valve core of the pressure regulating valve moves to the target position based on the target displacement and the initial displacement, generate a control instruction based on the number of pulses, and send the control instruction to the PLC; Driver, connected to PLC, used to control the motor operation based on control instructions; The pressure regulating valve is connected to the motor and is used to adjust the valve core to a target position through a threaded rod under the drive of the motor.

[0006] In a possible implementation, the host computer is installed with preset software: The preset software obtains the target control pressure input by the user; The preset software obtains the comparison relationship between pipeline pressure, valve core displacement and slurry ratio level; The preset software determines a target displacement of the valve core based on the control relationship and the target control pressure.

[0007] In a possible implementation, the host computer is connected to the PLC via a network cable.

[0008] In a possible implementation, the communication method between the host computer and the PLC is Modbus-TCP.

[0009] In a possible implementation, a printer is further included, and the printer is electrically connected to the host computer.

[0010] In a possible implementation, the pressure regulating valve further includes a cavity, the threaded rod is connected to the valve core, the cavity is provided with an inlet and an outlet, and the valve core can move in the outlet direction under the push of the threaded rod.

[0011] In a possible implementation, the positional relationship between the valve core and the outlet hole of the outlet includes: a non-contact stage, a start-contact stage, a semi-contact stage, and a full-contact stage.

[0012] In a possible implementation, in the semi-contact stage, the calculation formula for the cross-sectional area of ​​the non-contact between the valve core and the outlet hole is:

[0013] in, Indicates the diameter of the valve core's large cross section; Indicates the diameter of the small cross section of the valve core; It indicates the distance between the valve core and the front end of the threaded rod when the valve core has completely contacted the contact surface of the outlet hole; Indicates the distance between the valve core and the front end of the threaded rod when the valve core begins to contact the outlet hole contact surface ；S Indicates the distance from one end of the valve core to the valve core in the semi-contact stage; Indicates the non-contact cross-sectional area between the valve core and the outlet hole.

[0014] On the other hand, the present invention further provides a pressure regulating method for high-pressure chemical grouting, which is applied to the pressure regulating system for high-pressure chemical grouting as described in any one of the above items, and the method comprises: Obtaining an initial displacement and a pipeline pressure, wherein the initial displacement is the distance between the valve core of the pressure regulating valve and the end of the threaded rod, and the pipeline pressure is the pressure between the pressure regulating valve and the chemical irrigation pump; Get the target control pressure input by the user; Obtain the relationship between pipeline pressure, valve core displacement and slurry ratio; determining a target displacement of the valve core based on the control relationship and the target control pressure; The number of pulses that the motor needs to execute to move the spool of the pressure regulating valve to the target position is determined based on the target displacement and the initial displacement, a control instruction is generated based on the number of pulses, and the control instruction is sent to the PLC, so that the PLC drives the driver to act based on the control instruction, the driver works to make the motor run, and the motor runs to make the pressure regulating valve move to the target position through the threaded rod to adjust the spool.

[0015] In a possible implementation, the step of obtaining the target control pressure input by the user includes: The target control pressure input by the user is obtained based on the preset software on the host computer.

[0016] The beneficial effects of the present invention are as follows: the present invention provides a pressure regulating system for high-pressure chemical grouting, which obtains the initial displacement between the valve core of the pressure regulating valve and the end of the threaded rod through a displacement sensor, and obtains the pipeline pressure between the pressure regulating valve and the chemical grouting pump through a pressure sensor, so that the PLC sends the initial displacement and the pipeline pressure to the host computer, so that the host computer can obtain the initial displacement and the pipeline pressure in time, and further the host computer determines the target displacement of the valve core based on the obtained target control pressure and target slurry ratio and pipeline pressure, determines the number of pulses that the motor needs to execute to move the valve core of the pressure regulating valve to the target position based on the target displacement and the initial displacement, generates a control instruction based on the number of pulses, and sends the control instruction to the PLC, the PLC drives the driver to work according to the control instruction, the driver drives the motor to work, and the motor drives the valve core to move to the target position, thereby automatically controlling the outflow of chemical grouting, and the purpose of precise pressure control and high stability is achieved through this automatic control of the outflow of chemical grouting. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic structural diagram of an embodiment of a pressure regulating system for high-pressure chemical grouting provided by the present invention; Figure 2 A schematic diagram of the relative positions of the valve core and the outlet at four stages in one embodiment of a pressure regulating system for high-pressure chemical grouting provided by the present invention; Figure 3 A schematic flow chart of an embodiment of a pressure regulating method for high pressure chemical grouting provided by the present invention; Among them, 101 is a displacement sensor; 102 is a pressure sensor; 103 is a PLC; 104 is a host computer; 105 is a driver; 106 is a motor; and 107 is a pressure regulating valve. DETAILED DESCRIPTION

[0018] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0019] Before showing the embodiments, the following terms are explained. A programmable logic controller (PLC) is a digital computing controller with a microprocessor for automated control, which can load control instructions into memory at any time for storage and execution. A programmable controller consists of functional units such as a CPU, instruction and data memory, input / output interface, power supply, and digital-to-analog conversion.

[0020] The present invention provides a pressure regulating system and method for high-pressure chemical grouting, which are respectively described below.

[0021] Figure 1 A schematic diagram of an embodiment of the pressure regulating system for high pressure chemical grouting provided by the present invention is shown in FIG. Figure 1 As shown, the pressure regulating system 100 for high pressure chemical grouting comprises: The displacement sensor 101 is used to obtain the initial displacement between the valve core of the pressure regulating valve 107 and the end of the threaded rod connected to the valve core, and send the initial displacement to the PLC 103; The pressure sensor 102 is used to obtain the pipeline pressure between the pressure regulating valve 107 and the chemical grouting pump connected to the pressure regulating valve through a pipeline, and send the pipeline pressure to the PLC; PLC 103 is connected to the displacement sensor 101 and the pressure sensor 102 respectively, and is used to send the initial displacement and pipeline pressure to the host computer 104; The upper computer 104 is connected to the PLC for communication, and is used to determine the target displacement of the valve core based on the acquired target control pressure, target slurry ratio level, and pipeline pressure, determine the number of pulses that the motor needs to execute when the valve core of the pressure regulating valve moves to the target position based on the target displacement and the initial displacement, generate a control instruction based on the number of pulses, and send the control instruction to the PLC; A driver 105 is connected to the PLC 103 and is used to control the operation of the motor 106 based on the control instruction; The pressure regulating valve 107 is connected to the motor 106 and is used to adjust the valve core to move to a target position through a threaded rod under the drive of the motor 106 .

[0022] Compared with the prior art, the present embodiment provides a pressure regulating system for high-pressure chemical grouting, which obtains the initial displacement between the valve core of the pressure regulating valve and the end of the threaded rod through a displacement sensor, and obtains the pipeline pressure between the pressure regulating valve and the chemical grouting pump through a pressure sensor, so that the PLC sends the initial displacement and the pipeline pressure to the host computer, so that the host computer can obtain the initial displacement and the pipeline pressure in time. The host computer further determines the target displacement of the valve core based on the obtained target control pressure, target slurry ratio and pipeline pressure, determines the number of pulses that the motor needs to execute to move the valve core of the pressure regulating valve to the target position based on the target displacement and the initial displacement, generates a control instruction based on the number of pulses, and sends the control instruction to the PLC, the PLC drives the driver to work according to the control instruction, the driver drives the motor to work, and the motor drives the valve core to move to the target position, thereby automatically controlling the outflow of chemical grouting, and the purpose of precise pressure control and high stability is achieved through this automatic control of the outflow of chemical grouting.

[0023] It should be noted that the target control pressure is input in the upper computer software. In actual applications, the pipeline pressure varies to a certain extent and is affected by many factors, such as changes in geological conditions during slurry injection. Therefore, it is understandable that as the pipeline pressure changes, in order to keep the control pressure at the input target control pressure, the valve core needs to be moved so that the control pressure value reaches the input target control pressure.

[0024] In some embodiments of the present invention, the host computer is installed with preset software: The preset software obtains the target control pressure input by the user; The preset software obtains the comparison relationship between pipeline pressure, valve core displacement and slurry ratio level; The preset software determines a target displacement of the valve core based on the control relationship and the target control pressure.

[0025] Specifically, the entire process of regulating and controlling the pressure is recorded by software and a report is generated.

[0026] In a specific embodiment of the present invention, the host computer 104 is a control system host and control system software, and the control system software is a preset software. Among them, the target control pressure is used to input into the preset software according to the demand, and the control relationship between the pipeline pressure, the displacement of the valve core and the slurry ratio level is obtained by combining laboratory data with field data, and the control relationship between the pipeline pressure, the displacement of the valve core and the slurry ratio level is established by high-precision grid division.

[0027] In some embodiments of the present invention, the host computer is connected to the PLC via a network cable.

[0028] In some embodiments of the present invention, the communication method between the host computer and the PLC is Modbus-TCP.

[0029] In some embodiments of the present invention, a printer is further included. The printer is electrically connected to the host computer and can be used to print reports.

[0030] In a specific embodiment of the present invention, the accuracy of movement of the valve core is 0.05 mm.

[0031] It should be noted that the working principle of the pressure regulating valve is to change the opening degree of the valve core, control the channel area of ​​the fluid passing through the valve core, and thus stabilize the pressure of the regulating system. In some embodiments of the present invention, the pressure regulating valve further includes a cavity, the threaded rod is connected to the valve core, the cavity is provided with an inlet and an outlet, and the valve core can move in the outlet direction under the push of the threaded rod.

[0032] In some embodiments of the present invention, the positional relationship between the valve core and the outlet hole of the outlet includes: a non-contact stage, a start-contact stage, a semi-contact stage, and a full-contact stage.

[0033] Specifically, Figure 2 As shown, the figure shows the positional relationship between the valve core and the outlet hole of the outlet during the non-contact stage, the initial contact stage, the semi-contact stage and the complete contact stage.

[0034] In some embodiments of the present invention, the target control pressure is input in the upper computer software. In actual applications, the pipeline pressure varies to a certain extent, and the pipeline pressure is affected by many factors, such as changes in geological conditions during slurry injection. Therefore, it can be understood that as the pipeline pressure changes, in order to keep the control pressure at the input target control pressure, the valve core needs to be moved so that the control pressure value reaches the input target control pressure.

[0035] In some embodiments of the present invention, during the pressure regulation process, in the semi-contact stage, the cross-sectional area calculation formula of the non-contact between the valve core and the outlet hole is:

[0036] in, Indicates the diameter of the valve core's large cross section; Indicates the diameter of the small cross section of the valve core; It indicates the distance between the valve core and the front end of the threaded rod when the valve core has completely contacted the contact surface of the outlet hole; Indicates the distance between the valve core and the front end of the threaded rod when the valve core begins to contact the outlet hole contact surface ；S Indicates the distance from one end of the valve core to the valve core in the semi-contact stage; It indicates the non-contact cross-sectional area between the valve core and the outlet hole. The non-contact cross-sectional area between the valve core and the outlet hole is the area that allows fluid to flow through. The smaller this area is, the greater the corresponding pipeline pressure is.

[0037] Specifically, the cross-sectional area of ​​the valve core's large cross section is , the cross-sectional area of ​​the small section of the valve core is The target control pressure is the target value that the pressure regulating valve should reach. However, the pipeline pressure collected in the actual application process is changing and the pressure will fluctuate. If the pipeline pressure decreases, the displacement of the valve core should be adjusted to increase the pressure of the pressure regulating valve to approach the target pressure, and vice versa. Specifically, the non-contact cross-sectional area between the valve core and the outlet hole is the area that allows the fluid to flow through. The smaller this area is, the greater the corresponding pipeline pressure is.

[0038] On the other hand, the present invention further provides a pressure regulating method for high-pressure chemical grouting, which is applied to the pressure regulating system for high-pressure chemical grouting as described in any one of the above items, and the method comprises: S301, obtaining an initial displacement and a pipeline pressure, wherein the initial displacement is the distance between the valve core of the pressure regulating valve and the end of the threaded rod, and the pipeline pressure is the pressure between the pressure regulating valve and the chemical irrigation pump; S302, obtaining a target control pressure input by a user; S303, obtaining the comparison relationship between pipeline pressure, valve core displacement and slurry ratio level; S304, determining a target displacement of the valve core based on the control relationship and the target control pressure; S305. Determine the number of pulses that the motor needs to execute to move the valve core of the pressure regulating valve to the target position based on the target displacement and the initial displacement, generate a control instruction based on the number of pulses, and send the control instruction to the PLC, so that the PLC drives the driver to act based on the control instruction, the driver works to make the motor run, and the motor runs to make the pressure regulating valve move to the target position through the threaded rod to adjust the valve core.

[0039] Specifically, for example, if the number of pulses of the motor is 2000, the motor rotates one circle, which corresponds to the threaded rod moving forward 5 mm, that is, the displacement changes by 5 mm.

[0040] In some embodiments of the present invention, obtaining the target control pressure input by the user includes: The target control pressure input by the user is obtained based on the preset software on the host computer.

[0041] Those skilled in the art will appreciate that all or part of the processes of the above-mentioned embodiments can be implemented by instructing related hardware through a computer program, and the program can be stored in a computer-readable storage medium, wherein the computer-readable storage medium is a disk, an optical disk, a read-only storage memory, or a random access memory, etc.

[0042] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A pressure regulating system for high pressure chemical grouting, characterized in that: include: A displacement sensor is used to obtain an initial displacement between a valve core of the pressure regulating valve and an end of a threaded rod connected to the valve core, and send the initial displacement to a PLC; A pressure sensor is used to obtain the pipeline pressure between the pressure regulating valve and the chemical grouting pump connected to the pressure regulating valve through a pipeline, and send the pipeline pressure to the PLC; PLC, connected to the displacement sensor and the pressure sensor respectively, for sending the initial displacement and pipeline pressure to the host computer; The upper computer is connected to the PLC for communication, and is used to determine the target displacement of the valve core based on the acquired target control pressure, target slurry-liquid ratio level, and pipeline pressure, determine the number of pulses that the motor needs to execute when the valve core of the pressure regulating valve moves to the target position based on the target displacement and the initial displacement, generate a control instruction based on the number of pulses, and send the control instruction to the PLC; Driver, connected to PLC, used to control the motor operation based on control instructions; The pressure regulating valve is connected to the motor and is used to adjust the valve core to a target position through a threaded rod under the drive of the motor.

2. The pressure regulating system for high pressure chemical grouting according to claim 1, characterized in that: The host computer is installed with preset software: The preset software obtains the target control pressure input by the user; The preset software obtains the comparison relationship between pipeline pressure, valve core displacement and slurry ratio level; The preset software determines a target displacement of the valve core based on the control relationship and the target control pressure.

3. The pressure regulating system for high pressure chemical grouting according to claim 1, characterized in that: The host computer is connected to the PLC via a network cable.

4. The pressure regulating system for high pressure chemical grouting according to claim 1, characterized in that: The communication method between the host computer and the PLC is Modbus-TCP.

5. The pressure regulating system for high pressure chemical grouting according to claim 1, characterized in that: The device also includes a printer, which is electrically connected to the host computer.

6. The pressure regulating system for high pressure chemical grouting according to claim 1, characterized in that: The pressure regulating valve also includes a cavity, the threaded rod is connected to the valve core, the cavity is provided with an inlet and an outlet, and the valve core can move in the outlet direction under the push of the threaded rod.

7. The pressure regulating system for high pressure chemical grouting according to claim 6, characterized in that: The positional relationship between the valve core and the outlet hole of the outlet includes: a non-contact stage, a beginning contact stage, a semi-contact stage and a complete contact stage.

8. The pressure regulating system for high pressure chemical grouting according to claim 7, characterized in that: In the semi-contact stage, the calculation formula for the cross-sectional area of ​​the valve core and the outlet hole that is not in contact is: in, Indicates the diameter of the valve core's large cross section; Indicates the diameter of the small cross section of the valve core; It indicates the distance between the valve core and the front end of the threaded rod when the valve core has completely contacted the contact surface of the outlet hole; Indicates the distance between the valve core and the front end of the threaded rod when the valve core begins to contact the outlet hole contact surface ；S Indicates the distance from one end of the valve core to the valve core in the semi-contact stage; Indicates the cross-sectional area between the valve core and the outlet hole where there is no contact.

9. A pressure regulating method for high-pressure chemical grouting, applied to the pressure regulating system for high-pressure chemical grouting as claimed in any one of claims 1 to 8, characterized in that: The method comprises: Obtaining an initial displacement and a pipeline pressure, wherein the initial displacement is the distance between the valve core of the pressure regulating valve and the end of the threaded rod, and the pipeline pressure is the pressure between the pressure regulating valve and the chemical irrigation pump; Get the target control pressure input by the user; Obtain the relationship between pipeline pressure, valve core displacement and slurry ratio; determining a target displacement of the valve core based on the control relationship and the target control pressure; The number of pulses that the motor needs to execute to move the spool of the pressure regulating valve to the target position is determined based on the target displacement and the initial displacement, a control instruction is generated based on the number of pulses, and the control instruction is sent to the PLC, so that the PLC drives the driver to act based on the control instruction, the driver works to make the motor run, and the motor runs to make the pressure regulating valve move to the target position through the threaded rod to adjust the spool.

10. The pressure regulating method for high pressure chemical grouting according to claim 1, characterized in that: The step of obtaining the target control pressure input by the user includes: The target control pressure input by the user is obtained based on the preset software on the host computer.

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