KR20190103663A - Pumping concrete transfer condition evaluation and management system - Google Patents

Abstract

The present invention relates to a system for evaluating, maintaining and managing a transport state of pumped concrete which accurately measures and determines a transport state of concrete pumped through a pipe at a construction site, maintains an efficient transport state by quick action based on the transport state to efficiently maintain a transport pressure, and prevents a blockage in the pipe. According to the present invention, the system for evaluating, maintaining and managing a transport state of pumped concrete comprises: an electromagnetic field generation unit of a conductive material wound on an outer surface of a transport pipe in which concrete is pumped; a pulse generation unit to generate a pulse signal to apply a pulse signal to the electromagnetic field generation unit; one or more pressure measurement units installed on the transport pipe to measure a pressure in the transport pipe; a data collection unit to receive detection signals measured by the pressure measurement units to collect the detection signals; and a control unit to adjust a bandwidth, a frequency, and an amplitude of a pulse generated by the pulse generation unit, quantitatively evaluate a transport state of pumped concrete based on data collected by the data collection unit and display the transport state on a screen, and manually or automatically manage the transport state by a set management reference value.

Description

PUMPING CONCRETE TRANSFER CONDITION EVALUATION AND MANAGEMENT SYSTEM}

The present invention relates to a conveying concrete conveying state evaluation and maintenance system, and more particularly, to accurately measure and determine the conveying state of the concrete conveyed through the pipe at the construction site, and to maintain an efficient conveying state through quick measures based thereon The present invention relates to a system for evaluating and maintaining a conveyed concrete conveying state, which enables to maintain a conveying pressure efficiently and prevent a blockage in a pipe.

The present invention is the result of a research conducted by the International Joint Technology Development Project (Korea-Germany Joint R & D) supported by the Korea Industrial Technology Development Institute (Task No .: N040900010, Project Title: Concrete high efficiency (30%). )

In order to pour concrete in a high-rise building, concrete is pumped by pumping the concrete in the hopper up to a high floor using a concrete pumping device equipped with a pump. In this case, several concrete booms are connected from the discharge pipe of the hopper to the casting site. It will be pumped to the required height.

However, when the concrete is poured by high pressure pump pressure, a considerable pressure is applied to the pipeline as it goes up to a higher floor. Accordingly, the internal characteristics of the concrete that are pushed along the pipeline also change greatly due to internal pressure.

In particular, when material separation occurs during the change of physical properties, aggregates may be aggregated to hinder flow and increase frictional pressure with pipes, thereby increasing the pressure of a pump necessary for flow, and thus preventing pressure feeding.

As a result of this, when the gradual blockage occurs, the pressure in the pump equipment increases and the pressure in the pipe also increases. In this case, a considerable load is applied to the pump car to push out the concrete that is hardening. The pressure required, which can not be solved by the existing pump car, it takes a considerable amount of time to take action, the pipe is clogged, resulting in a cost, and the disadvantages such as prolonged construction period have.

(Document 1) Republic of Korea Patent Registration 10-1089917 (Dec. 5, 2011) (Document 2) Republic of Korea Patent Publication 1995-0002548 (1995.03.21. Notification)

Therefore, the present invention for solving the above-described problems, the precise measurement of the conveying state of the concrete conveyed through the pipe at the construction site, and accurately determine, and based on this to maintain the efficient conveying state through a quick action conveying pressure The purpose of the present invention is to provide a system for evaluating and maintaining a pressurized concrete conveying state, which can efficiently maintain and prevent blockage in a pipe.

The problems of the present invention are not limited to those mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention for achieving the objects and other features of the present invention, the electromagnetic field generating unit of the conductive material is wound on the outer surface of the conveying pipe is concrete conveyed; A pulse generator for generating a pulse signal for applying a pulse signal to the electromagnetic field generator; At least one pressure measuring unit installed at the conveying pipe to measure a pressure in the conveying pipe; A data collector configured to receive and collect a detection signal measured by the pressure measurer; And adjusting the bandwidth, frequency, and amplitude of the pulses generated by the pulse generator, quantitatively evaluating and displaying the transport state of the concrete to be transported based on the data collected by the data collector, and setting the management reference value. It is provided with a pressure concrete conveying state evaluation and maintenance system, including; a control unit for manual or automatic management.

In the present invention, the electromagnetic field generating unit is made of a coil that is inclined at an angle of 45 degrees to the outer surface of the conveying pipe, the pulse generating unit includes an H bridge circuit for cross-generating a magnetic field acting in the opposite direction inside the conveying pipe Wherein the H bridge circuit generates four power semiconductor elements arranged in an H shape, and generates a square wave having a predetermined period to generate first to fourth gate terminals of the power semiconductor element, respectively. A pulse generator for supplying the power generator, a square wave generation in the pulse generator, and a square wave supply to the power semiconductor device, and the four power semiconductor devices are alternately turned on each other in the opposite direction to the coil. And a controller for controlling the current to be applied crosswise, wherein the controller includes one of the gate terminals. A square wave having a phase difference of 180 degrees may be applied to the first gate, the third gate, and the second gate and the fourth gate so that the gate is opened and closed in the order in which the square wave is applied by the controller, thereby applying current to the inductor. .

In the present invention, the control unit calculates the arithmetic mean value, RMS average value, maximum value of the pressure by dividing the voltage signal in the form of pressure waveform from the voltage signal input from the data collection unit, the calculated arithmetic mean value, RMS average value, maximum A state evaluation unit for quantitatively evaluating the transport state of the concrete based on any one of the values and the set management reference value; A pulse adjusting unit for calculating a period and an amplitude of a pulse for controlling the pressure in the conveying pipe based on the result value evaluated by the state evaluating unit and transferring the calculated period and amplitude to the pulse generating unit; A display unit which displays the result of the evaluation by the state evaluating unit, the result of converting the pressure signal from the data collecting unit into a voltage signal in the form of a pressure waveform, and displays the value calculated by the pulse adjusting unit, and the user manages It may include a; operation unit for inputting a reference value.

In the present invention, the control unit outputs a pulse signal to the pulse generator to the pulse generator, and receives a voltage signal through the pressure sensor and the data collection unit, the pressure measuring unit, the state evaluation unit of the control unit again transfer state of concrete Quantitatively, and the feedback is fed back to the pulse controller to calculate the period and amplitude of the pulse for pressure control in the feed pipe, and the pulse controller controls the pulse having the corresponding bandwidth and period and amplitude to generate the pulse. It can be made to output through the negative.

According to the pressurized concrete conveying state evaluation and maintenance system according to the present invention, it is possible to accurately measure and determine the conveying state of the concrete conveyed through the pipe in the construction site to maintain an efficient conveying state through prompt measures to efficiently convey the conveying pressure It has a sustainable effect.

In addition, according to the present invention, by applying an electromagnetic field to the outer surface of the concrete conveying pipe to change the movement characteristics of the water molecules in the slip layer generated during the concrete flow to increase the flow rate, due to the increase in flow rate due to inertial force greater than the viscous force The pressure can be reduced to prevent the blockage in the pipe.

The effects of the present invention are not limited to those mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

1 is a block diagram schematically showing the configuration of a pressure concrete transport state evaluation and maintenance system according to the present invention.
2 is a view schematically showing the winding form and the direction of the magnetic field of the inductor which is an electromagnetic field generating unit constituting the pressure concrete transport state evaluation and maintenance system according to the present invention.
Figure 3 is a circuit diagram of the circuit portion of the pulse generating unit constituting the pressure concrete transport state evaluation and maintenance system according to the present invention.
Figure 4 is a graph showing an example of the pressure data received by the pressure sensor which is a pressure measuring unit constituting the pressure concrete transport state evaluation and maintenance system according to the present invention.
Figure 5 is a graph showing the measurement value distribution in the case of installing at a specific distance by using two or more pressure sensors that constitute the pressure concrete conveying state evaluation and maintenance system according to the present invention.

Further objects, features and advantages of the present invention can be more clearly understood from the following detailed description and the accompanying drawings.

Prior to the detailed description of the present invention, the present invention may be variously modified and may have various embodiments, and the examples described below and illustrated in the drawings are intended to limit the present invention to specific embodiments. It is to be understood that the present invention includes all modifications, equivalents, and substitutes included in the spirit and technical scope of the present invention.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. As used herein, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof described on the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

In addition, the terms "... unit", "... unit", "... module", and the like described in the specification mean a unit for processing at least one function or operation, which means hardware or software or hardware and It can be implemented in a combination of software.

In addition, in the description with reference to the accompanying drawings, the same components regardless of reference numerals will be given the same reference numerals and duplicate description thereof will be omitted. In the following description of the present invention, if it is determined that the detailed description of the related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Hereinafter, with reference to the accompanying drawings, a pressure transport concrete transport state evaluation and maintenance system according to a preferred embodiment of the present invention will be described in detail. 1 is a block diagram schematically showing the configuration of a pressure concrete transport state evaluation and maintenance system according to the present invention, Figure 2 is an inductor which is an electromagnetic field generating part constituting the pressure concrete transport state evaluation and maintenance system according to the present invention FIG. 3 is a diagram schematically illustrating a winding form and a direction of a magnetic field, and FIG. 3 is a circuit diagram of a circuit unit of a pulse generating unit constituting a pressure concrete transport state evaluation and maintenance system according to the present invention. Figure 4 is a graph showing an example of the pressure data received by the pressure sensor which is a pressure measuring unit constituting the pressure concrete transport state evaluation and maintenance system according to the present invention, Figure 5 is a pressure concrete conveyance state evaluation according to the present invention And distribution of measured values in the case where two or more pressure sensors, which constitute the maintenance system, are installed at specific distances.

The transport concrete evaluation and maintenance system according to the present invention, as shown in Figures 1 to 5, the electromagnetic field generating unit 100 of the conductive material wound on the outer surface of the transport pipe, the concrete is pumped; A pulse generator 200 generating a pulse signal for applying a pulse signal to the electromagnetic field generator 100; One or more pressure measuring unit 300 is installed in the conveying pipe for measuring the pressure in the conveying pipe; A data collector 400 which receives and collects a detection signal measured by the pressure measurer 300; And adjusting the bandwidth, frequency, and amplitude of the pulses generated by the pulse generator 200, and quantitatively evaluating the transport state of the concrete to be transported based on the data collected by the data collector 400. And a control unit 500 for displaying or manually managing the set management reference values.

The electromagnetic field generating unit 100 is formed of an inductor in which a coil of a conductive material such as copper is wound a predetermined number of times on an outer surface of the conveying pipe. Here, the inductor (coil) is the size of the electromagnetic field required for this depending on the physical properties of the concrete to be transported and has a number of windings accordingly is wound on the outside of the conveying pipe.

The inductor (coil) is based on a vertical winding, but as a modified example, as shown in Figure 2, in a state inclined obliquely to the flow direction of the concrete through the transfer pipe (inclination of about 40 ~ 50 °) It may be made by winding. As described above, the effect of the modified example in which the inductor (coil) is wound obliquely will be described in connection with the pulse generator 200 described later.

Here, the inductor (coil) is coupled to the outer circumferential surface of the conveying pipe and may be provided on the outer surface of the conveying pipe through a coil bobbin (not shown) formed on the outer circumferential surface of the coil winding. When the coil is wound through the coil bobbin, the coils can be prevented from being entangled by external stimulation or the movement of the conveying pipe due to the flow of the conveying concrete after installation, thereby safely generating a uniform magnetic field.

In addition, the inductor (coil) to monitor the flow of concrete transported in the transport pipe, rather than wound around the entire transport pipe, such as to monitor the expected location of the occlusion through the display unit constituting the control unit to be described later, or transfer in the occlusion estimation area It is desirable to install partly in the pipe.

In other words, in case of installing the inductor (coil) for the entire conveying pipe, it is not only costly and time-consuming to install, but also the power supplied for generating the magnetic field must be supplied in consideration of the resistance to the entire length of the pipe. There is also difficulty in maintenance and management, such as the need for power supply, so it is desirable to partially install at the expected point of occlusion or the estimated occlusion area as described above.

In addition, the inductor (coil) may be wound obliquely on the outer circumferential surface of the transfer pipe as a variant, in which case the magnetic field generated when the current is supplied to the coil is transferred by being inclined at an angle of 40 to 50 °. As well as the horizontal force in the direction parallel to the flow direction of the concrete as well as the vertical force in the direction perpendicular to the flow direction of the conveying concrete, it is possible to change the motion characteristics of the water molecules in the slip layer during the concrete flow to increase the flow rate The slurry deposited in the pipe wall can be suspended and removed. In this case, when the inductor is wound obliquely on the outside of the conveying pipe, the inductor (coil) is preferably wound at an angle of about 45 ° so that horizontal and vertical forces are evenly generated.

Next, the pulse generator 200 applies a pulse signal to the inductor (coil) to change the flow rate of the water molecules in the slip layer (slip layer) generated during the concrete flow by the electromagnetic field generated by the inductor to increase the flow rate It is to increase the pressure in the conveying pipe.

The pulse generator 200 generates a periodic pulse wave (for example, a square wave) using a circuit of a specific configuration. The circuit is the same as a general pulse generator, and the bandwidth, frequency, and amplitude of the circuit are received through the pulse controller 520 of the controller 500 to be described below. In this case, the pulse generator 200 is designed to combine the pulses of the two pulse generators, by using the two pulses can be beaten to have the shape and specifications of the entire pulse.

In the present invention, the circuit of the pulse generator 200 is preferably configured to include an H bridge circuit for cross-generating a magnetic field acting in the opposite direction inside the transfer pipe.

Specifically, as shown in FIG. 3, the H bridge circuit generates four power semiconductor elements 210 arranged in the shape of H, and generates a square wave having a predetermined period, thereby generating the power semiconductor elements. A pulse generator 220 to be supplied to each of the gate terminals 211 of 210, a square wave generation from the pulse generator 220, and a square wave supply to the power semiconductor device 210 by controlling the pulse generator 220. The four power semiconductor devices 210 are alternately turned on by two, and include a controller 230 for controlling the current to be applied to the coil in the opposite direction.

In this case, the power semiconductor device 210 is composed of the power semiconductor 1 to the power semiconductor 4 arranged to form the shape of the letter H, the inductor 100 is configured to be electrically connected to all four power semiconductors do. Accordingly, one end of the inductor 100 is connected between the power semiconductor 1 and the power semiconductor 2, and the other end of the inductor 100 is connected between the power semiconductor 3 and the power semiconductor 4 to form four The power semiconductor device 210 and the inductor 100 are connected to each other in the shape of the letter H as a whole.

The power semiconductor device 210 has a magnitude of current and voltage applied to the inductor 100 according to the electric field capacity or the diameter of the transfer pipe required to prevent the change or movement of water molecules in the slip layer of the transfer pipe. Of course, it can be made of a variety of types, it is preferable that the drive power is small and composed of an IGBT (Insulated Gate Bipolar mode Transistor) capable of high-speed switching.

The IGBT is a switching device having a structure of a power MOSFET (metal oxide semi-conductor field effect transistor) and a bipolar transistor, and has low driving power, high speed switching, high breakdown voltage, and high current density. It is a device capable of high densities, and is a power semiconductor device suitable for implementing high speed switching with small driving power.

In addition, the power semiconductor device 210 may be configured as a solid state relay (SSR), which is an electronic relay using a semiconductor as a contactless relay in some cases. The power supply Vcc supplied to the power semiconductor device is basically preferably connected to an AC power source, but may be configured using a DC power source such as a battery in a situation in which it is difficult to supply AC power.

As such, the power supplied to the power semiconductor device 210 may vary depending on the value calculated by the inner diameter of the conveying pipe and the flow rate of the concrete moving in the conveying pipe.

In addition, each gate terminal 211 is applied to the pulse generator 220 so that a square wave generated by the pulse generator 220 can be applied to the gate terminals Gate1, Gate2, Gate3, and Gate4 of each of the power semiconductor devices. Connected. As described above, the power waves are alternately turned on by the square wave generated by the pulse generator 220 and applied to the gate terminal 211 of each power semiconductor 220 by the control of the controller 230. As a result, the direction of the current flowing through the inductor 100 is reversed.

The pulse generator 220 is configured to generate a square wave in which a phase difference of 180 degrees is repeated at a predetermined period, and four power semiconductors 220 are provided at one end to supply the generated square wave to each gate terminal 211 of the power semiconductor. Are connected to the respective gate terminals Gate1, Gate2, Gate3, and Gate4 211.

The period or magnitude of the square wave generated by the pulse generator 220 is controlled by the pulse adjusting unit 520 of the control unit 500.

The controller 230 may alternately apply the current applied to the inductor 100 in the opposite direction according to the phase change of the square wave generated by the pulse generator 220, and the diagonal direction of the power semiconductor 1. A square wave of the same phase is applied to each gate terminal 211 of the power semiconductor 4 positioned at the power semiconductor 1, and the power semiconductor 1 is applied to each gate terminal of the power semiconductor 3 positioned in the diagonal direction. , So that a square wave having a phase difference of 180 degrees with a square wave applied to 4 is applied. Accordingly, the power semiconductors 1 and 4 and the power semiconductors 2 and 3 alternately turn on in accordance with the phase change of the square wave applied to the gate terminal, so that current flows through the inductor 100.

Therefore, when a square wave signal is applied to each gate terminal (Gate 1, 4 Input) of the power semiconductors 1 and 4, the power semiconductors 1 and 4 are turned on together, and the power semiconductor 1 and the coil in the power supply Vcc. A current flows through the coil 120 and the power semiconductor 4, and the current flows from the left to the right in the inductor 100 due to the flow of the current. At this time, each gate terminal of the power semiconductors 2 and 3 is supplied with a signal having a phase difference of 180 degrees from a signal applied to each gate terminal of the power semiconductors 1 and 4 to maintain a turn-off state.

Subsequently, when a square wave signal is applied to each gate terminal (Gate 2, 3 Input) of the power semiconductors 2 and 3 according to the phase change of the square wave, the power semiconductors 2 and 3 are turned on together and the power supply Vcc In the current flows through the power semiconductor 3 and the inductor 100 and the power semiconductor 2, the current flows from the right to the left in the inductor 100 due to the flow of this current. In this case, the gate terminals of the power semiconductors 1 and 4 are supplied with a signal having a phase difference of 180 degrees from a signal applied to the gate terminals of the power semiconductors 2 and 3, thereby maintaining a turn-off state.

In the H bridge circuit, a square wave having the same phase is applied to the gate terminals of the power semiconductors 1 and 4 and the gate terminals of the power semiconductors 2 and 3 located in the diagonal directions, and the gate terminals of the power semiconductors 1 and 4 Since the square waves applied to the gate terminals of the power semiconductors 2 and 3 have a phase difference of 180 degrees with each other, the power semiconductors located in the diagonal direction can be turned on at the same time to form a flow of current.

As such, when currents flowing in opposite directions with a predetermined period by the controller 230 are applied to the inductor 100, a magnetic field is induced around the inductor 100 to form a strong magnetic field inside the coil. The magnetic force is generated, and the magnetic field and the magnetic force can cause the movement of the polar particles contained in the concrete inside the transfer pipe. Accordingly, the inductor is installed at the point where the pressure increases (or the position where the slip layer is estimated to be accumulated) in the conveying pipe during the conveying of the conveying concrete.

Here, the inductor 120 is wound in a direction perpendicular to the flow traveling direction in the transfer pipe to add a magnetic force only in the same direction as the flow travel direction, instead of the inductor 100 to the transfer pipe as a modification thereof, That is, by winding obliquely (about 45 degrees inclined state) with respect to the flow direction of the transfer concrete, water molecules in the slip layer not only add magnetic force in the flow direction but also have a slip layer adhered to the inner circumferential surface of the transfer pipe. It is possible to reduce the pressure in the conveying pipe by converting the kinetic characteristics of and thereby increasing the flow rate.

As in this modified example, it is wound around the inductor 100 by the flow of current flowing in the inductor 100 installed at an inclined angle of 40 to 50 °, preferably 45 °, to the flow direction of the concrete transported in the transport pipe. A magnetic field is formed in a direction perpendicular to the true coil, that is, in a direction oblique to the flow flow direction of the concrete, and this magnetic field changes the motion characteristics of the water molecules in the slip layer generated when the concrete flows through the conveying pipe. At this time, the magnetic field generated in a direction oblique to the flow direction of the concrete is not only a shear force acting horizontally with the conveying direction of the concrete, but also a vertical force toward the inner circumferential surface of the pipe, that is, perpendicular to the flow direction of the concrete. The vertical force acting vertically may generate a force that detaches the slurry that is blocked by colliding with the inner wall of the transfer pipe.

As such, the movement of the water molecules in the slip layer is changed by the vertical force acting toward the inner circumferential surface of the pipe, and the electromagnetic force forms a vortex along the surface of the pipe by the vertical component of the magnetic force that strikes the inner circumferential surface of the pipe, thereby rotating the pipe surface. It is possible to generate a rotational force, thereby allowing the slurry deposited on the inner circumferential surface of the pipe to be more easily floated off the surface.

Then, if the phase difference of the square wave is changed so that the direction of current flows through the inductor 100 is reversed, the magnetic field may act in the opposite direction, that is, toward the bottom left, and desorb the slurry accumulated inside the pipe.

Next, the pressure measuring unit 300 is composed of a pressure sensor for measuring the pressure in the conveying pipe, preferably as shown in Figure 5 is provided with two or more pressure sensors to check the pressure gradient in the conveying pipe It is preferable.

Subsequently, the data collection unit 400 which receives and collects the detection signal measured by the pressure measuring unit 300 is configured to convert the voltage signal from the pressure signal output from the pressure sensor. That is, the data collector 400 includes an A / D converter to convert an analog signal into a digital signal, and converts the pressure signal of the pressure sensor into a voltage signal in the form of a pressure waveform by using the digital signal. The display unit 530 is displayed on the screen.

Next, the control unit 500 divides the voltage signal input from the data collection unit 400 by dividing the voltage signal in the form of a pressure waveform to calculate an arithmetic mean value, an RMS mean value, and a maximum value of the pressure, and calculate the calculated arithmetic mean value, The condition evaluator 510 quantitatively evaluates the transport state of the concrete based on the abnormality value of any one of the RMS average value and the maximum value and the set management reference value, and based on the result value evaluated by the condition evaluator 510. The pulse control unit 520 for calculating the period and amplitude of the pulse for the pressure control in the transfer pipe to the pulse generator 200 and the state evaluator 510, the evaluation result, the data collection unit ( A display unit 530 for displaying a result of converting the pressure signal from 400 into a voltage signal in the form of a pressure waveform, and displaying a value calculated by the pulse controller 520, and a user management; The operation unit 540 for inputting a reference value is included.

Here, the state evaluator 510 of the controller 500 divides the voltage signal input from the data collector 400 into a voltage waveform in the form of a pressure waveform to calculate an arithmetic mean value, an RMS mean value, and a maximum value of the pressure. And a comparison operation unit (not shown) for comparing an abnormal value of any one of the calculated arithmetic mean value, RMS average value, and maximum value with the set management reference value, and the arithmetic mean value, RMS average value, and maximum value calculated by the comparison operation unit. When the abnormal value of the satisfies the management reference value may further include an automatic control unit (not shown) to automatically manage the control by passing the management reference value to the pulse control unit 520.

In addition, the control unit 500 further includes an application interlocking unit (not shown) that is interlocked with a coordinated application provided in the manager terminal device, and transmits a control situation in real time through the interlocking application of the manager terminal device. An operation input screen corresponding to the operation unit 540 may be configured to be remotely managed through the user terminal device.

On the other hand, the data collection unit 400 and the control unit 500 may be made to be delivered via wired or wireless communication.

Referring to the effect of the transport concrete evaluation and maintenance system according to the present invention configured as described above are as follows.

When explaining the technical premise for understanding the operation of the present invention, the molecular structure of the water is a dipole structure can be changed the flow characteristics by adjusting the movement of water molecules when applying an electromagnetic field to the flow. That is, the motion characteristics of the water molecules can be changed only by applying an electromagnetic field to the water molecules, and when a pulse is applied according to the flow direction of the water molecules, the flow of water molecules can be induced according to the user's intention. There have been many cases of changing the characteristics of water by applying the existing electromagnetic field, but this is simply applying the electromagnetic field to the water molecules to convert only the molecular structure, in which case there are many restrictions to control the flow of water molecules. In addition, the application of the electromagnetic field can control the flow to some extent in the steady state flow, but is not applicable to the abnormal state flow of the mixture such as concrete pumping.

A method for overcoming this is to generate a pulse waveform according to an abnormal flow state of the electromagnetic field to drive a suitable pulse in the flow.

In particular, when a specific pulse is applied in the flow in the conveying pipe, it causes an effect called the clean flow in the boundary layer (Richardson effect), which increases the flow velocity in the slip layer. By generating a large inertia force, the flow in the slip layer is developed to overcome the viscosity.

The conveying concrete conveying state evaluation and maintenance system according to the present invention applies such a Richardson effect to the flow in the conveying pipe of unconsolidated concrete, which is a mixture of abnormal state, to predict and evaluate the pressure drop occurring during the conveying of the pipe, and maintain In order to apply the transport concrete evaluation and maintenance system according to the present invention according to the present invention, the abnormal pressure state in the transport pipe is controlled, and the flow in the case where the pump is impossible due to the limit pressure of the pump as an actuator This can lead to more stable and faster pouring. In order to apply this method, it is necessary to understand the characteristics of the concrete that is not hardened.

When conveying the hardened concrete, two layers are formed in the conveying pipe. A plug zone mainly composed of aggregate, cement paste and mortar, and a slip layer composed of cement milk and water are created. In the double slip layer, the water content increases with the cement paste, where the velocity distribution of the Newtonian fluid occurs and the viscous force becomes dominant. Therefore, the pressure required for the total pressure is controlled by the flow of this part while friction is part of the actual conveying pipe in the feeding.

When the system is operated in a state in which a management reference value is set through a manual operation or an automatic control unit by a user through the operation unit, the pulse control unit 520 outputs a pulse signal to the pulse generator 200, and the pressure sensor 300. The voltage signal is input through the data collector 400, the state evaluator 510 of the controller 500 quantitatively evaluates the transport state of the concrete, and feeds back the evaluation result to the pulse controller 520. The period and amplitude of the pulse for pressure control in the transfer pipe are calculated and controlled by the pulse adjusting unit 520 as a pulse having a corresponding bandwidth, period and amplitude, and output through the pulse generator 200.

Meanwhile, when the pulse generator 200 applies a pulse signal to the inductor 100, an electromagnetic field may be generated in the inductor to generate the same effect not only in the water in the conveying pipe but also in mixtures with water particles.

In other words, when the liquid concrete flows in the conveying pipe, the flow rate of the cement milk layer in the slip layer occurring on the surface of the conveying pipe is increased and the thickness of the slip layer is developed to reduce the friction between the concrete layer and the pressure feeding pipe, It is possible to reduce the pressure feeding pressure in the conveying pipe.

In addition, the inductor of the present invention has a basic configuration that is wound in a vertical direction, but as a variation can be to be inclined obliquely as a variant to the vertical force acting toward the inner circumferential surface of the conveying pipe, that is perpendicular to the flow flow direction of the concrete This vertical force acting vertically creates a force to detach the blocked slurry or sludges that may cause the blockage as it collides with the inner wall of the conveying pipe, thereby allowing it to float off the surface of the conveying pipe more easily. You can do that.

According to the evacuated concrete conveying state evaluation and maintenance system according to the present invention as described above, by accurately measuring and determining the conveying state of the concrete conveyed through the pipe at the construction site to maintain an efficient conveying state through prompt measures There is an advantage that can maintain the feed pressure efficiently.

In addition, according to the present invention, by applying an electromagnetic field to the outer surface of the concrete conveying pipe to change the movement characteristics of the water molecules in the slip layer generated during the concrete flow to increase the flow rate, due to the increase in flow rate due to inertial force greater than the viscous force There is an advantage in that the pressure can be reduced to prevent the blockage in the pipe.

The embodiments and the accompanying drawings described herein are merely illustrative of some of the technical ideas included in the present invention. Therefore, since the embodiments disclosed herein are not intended to limit the technical spirit of the present invention, but to explain, it is obvious that the scope of the technical spirit of the present invention is not limited by these embodiments. Modifications and specific embodiments that can be easily inferred by those skilled in the art within the scope of the technical idea included in the specification and drawings of the present invention should be construed as being included in the scope of the present invention.

100: all field generator (inductor)
200: pulse generator
210: power semiconductor device
211: gate terminal
220: pulse generator
230: controller
300: pressure measuring unit (pressure sensor)
400: data collector
500: control unit
510: state evaluation unit
520: pulse control unit
530: display unit
540: control panel

Claims (4)

Electromagnetic field generating unit of the conductive material is wound on the outer surface of the conveying pipe is pressed concrete;
A pulse generator for generating a pulse signal for applying a pulse signal to the electromagnetic field generator;
At least one pressure measuring unit installed at the conveying pipe to measure a pressure in the conveying pipe;
A data collector configured to receive and collect a detection signal measured by the pressure measurer; And
Adjust the bandwidth and frequency and amplitude of the pulse generated by the pulse generator, and quantitatively evaluate and display the transport state of the concrete to be transported based on the data collected by the data collector, and set to the set management reference value Control unit for manual or automatic management; including
Evacuated concrete conveyance condition evaluation and maintenance system.
The method of claim 1,
The electromagnetic field generating unit is made of a coil wound perpendicular to the outer surface of the conveying pipe,
The pulse generator comprises an H bridge circuit for cross-generating a magnetic field acting in the opposite direction inside the transfer pipe,
The H bridge circuit generates four power semiconductor elements arranged in a shape of H, and pulses for generating square waves having a predetermined period and supplying them to the first to fourth gate terminals of the power semiconductor element. A pulse generator, a square wave generation in the pulse generator, and a square wave supply to the power semiconductor device are controlled to alternately turn on the four power semiconductor devices, so that the current in the opposite direction is applied to the coil. Includes a controller that controls the
The controller has a square wave having a phase difference of 180 degrees applied to the first gate, the third gate, and the second gate and the fourth gate among the gate terminals, and the gate is opened and closed in the order in which the square wave is applied in the controller. Made to apply current
Evacuated concrete conveyance condition evaluation and maintenance system.
The method according to claim 1 or 2,
The control unit
The voltage signal input from the data collector is divided into a voltage waveform in the form of a pressure waveform to calculate an arithmetic mean value, an RMS mean value, and a maximum value of the pressure. A state evaluation unit for quantitatively evaluating a transport state of concrete based on a set management reference value;
A pulse adjusting unit for calculating a period and an amplitude of a pulse for controlling the pressure in the conveying pipe based on the result value evaluated by the state evaluating unit and transferring the calculated period and amplitude to the pulse generating unit;
A display unit configured to display a result calculated by the condition evaluator, converting the pressure signal from the data collector into a voltage signal in the form of a pressure waveform, and displaying a value calculated by the pulse controller;
A control unit for inputting a management reference value by the user;
Evacuated concrete conveyance condition evaluation and maintenance system.
The method of claim 3,
The control unit
The pulse controller outputs a pulse signal to a pulse generator, and receives a voltage signal through the pressure sensor, which is the pressure measuring unit, and the data collector, and the state evaluator of the controller quantitatively evaluates the transport state of concrete again, and the evaluation result. Is fed back to the pulse control unit to calculate the period and amplitude of the pulse for pressure control in the conveying pipe, and the pulse control unit to control the pulse having the band width, period and amplitude to output through the pulse generator
Evacuated concrete conveyance condition evaluation and maintenance system.

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