Batcher plant and method for producing cement milk in a batch plant

Abstract

To solve a problem that, since the amount of residual cement milk in an agitator has been unknown up to now, the production of cement milk at the volume unit of a mixer has been required to cause useless cement milk production, and further, when cement milk is not enough, additional cement milk production has been required to deteriorate working efficiency.SOLUTION: In a batcher plant, a mixer 3 and an agitator 4 temporarily storing cement milk are fitted to a frame 2, a cement silo 5 and a water storage tank 6 are provided, respectively, regarding the mixer 3, a kneading bucket 10 of the mixer 3 is suspended inside the plant frame 2 vertically movably, also the kneading bucket 10 is fitted with a weight measuring instrument 11, an exhaust part 26 exhausting the cement milk in the mixer 3 is connected to the agitator 4, further the exhaust part 26 is provided with a mixer exhaust valve 27, and a prescribed position of the agitator 4 is provided with a cement milk detector 30 capable of always detecting the amount of the cement milk in the agitator 4.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a batch plant and a method for manufacturing cement milk in a batch plant.

Background Art

[0002] Conventionally, there has been known a configuration of a batch plant having a mixer for producing cement milk by stirring water and cement, and an agitator for temporarily storing the cement milk produced by the mixer, and at a predetermined position of the agitator, a cement milk detector for detecting that a certain amount of cement milk in the agitator has been stored (Patent Document 1). Regarding the relationship between the volumes of the mixer and the agitator in a known batch plant, since the cement milk kneaded by the mixer is put into the agitator for temporary storage, the volume of the agitator is formed larger than the volume of the mixer so that the entire amount of the cement milk kneaded by the mixer can be received by the agitator. When the cement milk detector detects that there is a sufficient empty volume in the agitator to allow the entire amount of the volume of the mixer to be charged with cement milk, the cement milk in the mixer is discharged and supplied to the agitator.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the above-known example, when there is a sufficient empty volume in the agitator that is more than the volume of the mixer, the cement milk in the mixer is discharged and supplied to the agitator. Therefore, it is sufficient to detect the cement milk at a certain water level in the agitator, and it is not necessary to detect the water level of the cement milk in real time (constantly), and the water level of the cement milk has not been detected in real time (constantly). Therefore, the current amount of cement grout in the agitator was unknown, and when supplying the cement grout produced by the batching plant to the earth auger for ground improvement, it was not possible to produce the optimal amount of cement grout, resulting in the wasteful production of cement grout. Furthermore, when there was insufficient cement grout, additional cement grout had to be produced, which meant that pile driving and ground improvement work could not be carried out during that time, resulting in poor work efficiency. In other words, because the amount of cement grout remaining in the agitator was unknown, cement grout had to be manufactured in units of the mixer's volume. This meant that even when only a small amount of cement grout was needed, less than the mixer's volume, cement grout had to be manufactured in units of the mixer's volume, and the remaining cement grout had to be discarded, resulting in a waste of cement grout. Furthermore, cement grout could not be produced in the mixer until a space equal to the volume of the mixer was created inside the agitator, nor could it be produced in advance. This meant that the production of cement grout took time, resulting in poor work efficiency. The present invention aims to improve the efficiency of cement grout production, prevent the wasteful disposal of cement grout, shorten the cement grout production time, and improve the overall efficiency of the production process by enabling the constant detection of the amount of residual cement grout in the agitator. [Means for solving the problem]

[0005] The invention of claim 1 comprises a mixer 3 that stirs water and cement to produce cement milk, and an agitator 4 that temporarily stores the cement milk produced by the mixer 3. plant Attached to frame 2, a cement silo 5 for storing cement and a water storage tank 6 for storing water to be added to the cement are provided near the mixer 3, and the mixer 3 is for mixing bucket 10 is suspended within the plant frame 2 so as to be able to move up and down, and for mixing bucket A weight measuring device 11 is attached to 10, and a discharge section for discharging cement grout from inside the mixer 3 is provided at a predetermined position at the bottom of the mixer 3. 16 It is connected to the agitator 4 and the discharge section16 A mixer discharge valve 27 is provided, and a cement milk detector 30 capable of constantly detecting the amount of cement milk in the agitator 4 is provided at a predetermined position on the agitator 4. Each of these components is controlled by a controller, and the cement milk detector 30 constantly detects the remaining amount of cement milk in the agitator 4. Based on the remaining amount of cement milk, the mixer 3 is operated as needed to produce the required amount of cement milk and discharge it to the agitator 4. This was a batching plant. The invention of claim 2 involves supplying water and cement to a mixer 3 and mixing them for a predetermined time to produce cement milk, and discharging the cement milk produced by the mixer 3 to an agitator 4 located below the mixer 3. In the method, Agitator 4 ni A A cement milk detector 30 is provided to constantly detect the amount of cement milk in the jitator 4. The cement milk detector 30 constantly detects the remaining amount of cement milk in the agitator 4, and based on the remaining amount of cement milk, the mixer 3 is operated as needed to produce the required amount of cement milk and discharge it to the agitator 4. This is a method for producing cement milk in a batching plant. [Effects of the Invention]

[0006] In the inventions of claims 1 and 2, a cement milk detector 30 capable of constantly detecting the amount of cement milk in the agitator 4 is provided at a predetermined position in the agitator 4. As a result, the amount of remaining cement milk in the agitator 4 can be constantly monitored by the cement milk detector 30, and only the required amount of cement milk can be produced, even if it is less than the volume of the mixer 3, taking into account the amount of remaining cement milk. This prevents the generation of discarded remaining cement milk and improves production efficiency. Furthermore, since cement milk can be produced in the mixer 3 at any time according to the amount of remaining cement milk in the agitator 4, the production time can be shortened and work efficiency can be improved. In other words, because the discharge of the agitator 4 can be controlled by comparing the remaining amount in the mixer 3 and the remaining amount in the agitator 4, it is possible to increase the amount of cement milk that can be stored in the agitator 4 without having to consider the amount of mixture produced by the mixer 3, thus enabling efficient batch operation. [Brief explanation of the drawing]

[0007] [Figure 1] A schematic diagram showing the layout of the batching plant, cement silo, and water storage tank. [Figure 2] A cross-sectional view of the mixer. [Figure 3] The same floor plan. [Figure 4] Front view of the batching plant. [Figure 5] Side view of the same. [Figure 6] Front view of the agitator. [Figure 7] Flowchart showing the operating status of the batching plant. [Figure 8] Block diagram. [Modes for carrying out the invention]

[0008] One embodiment of the present invention will be illustrated with reference to a diagram in which 1 is a portable batching plant for manufacturing cement milk, and the configuration of batching plant 1 is arbitrary, and one example will be described below. The plant frame 2 of the batching plant 1 is equipped with at least a mixer 3 that mixes water and cement to produce cement grout, and an agitator 4 that temporarily stores the cement grout produced by the mixer 3 while stirring it to prevent it from hardening (Figure 1). Near the batching plant 1 are a cement silo 5 for storing cement to be supplied to the mixer 3, and a water storage tank 6 for storing water to be added to the cement. The configuration of the water storage tank 6 is arbitrary; the water storage tank 6 only needs to be able to store water, and the water storage tank 6 is configured to supply water to the batching plant 1 (mixer 3) via the water supply hose 6A by the drive source 7 (Figure 1).

[0009] The configuration of the cement silo 5 is arbitrary; it only needs to be able to store cement, and the cement silo 5 is configured to be able to send cement to the batching plant 1 (mixer 3) via the transport hose 8 by the drive source 7 (Figure 1). The mixer 3 suspends the kneading trough 10 in the plant frame 2 so as to be vertically movable, and a weighing device (load cell) 11 is attached to the kneading trough 10 (Fig. 1). The weighing device 11 is configured to be installed and measured at a plurality of locations in consideration of the weight balance of the mixer 3 so that the weight of the mixer 3 can be accurately measured. A stirring blade 12 that rotates about a vertical axis is provided in the kneading trough 10 (Fig. 2). The upper part of the stirring shaft 13 of the stirring blade 12 is axially mounted on the top plate 14 of the kneading trough 10, and a rotary input member 15 formed of a pulley or a gear is provided on the stirring shaft 13 protruding above the top plate 14. 16 is a discharge part that discharges the cement milk of the mixer 3

[0010] An opening 24 for charging the cement conveyed by the conveying hose 8 of the cement silo 5 is provided on the top plate 14 of the mixer 3. A hose support part 20 is provided on the upper frame 2 at a predetermined interval from the opening 24, and a predetermined part at the front side of the conveying hose 8 is attached to the hose support part 20 (Fig. 2). The tip (lower end) of the conveying hose 8 is hung downward from the hose support part 20, and the tip of the conveying hose 8 is inserted into the opening 24. The conveying hose 8 itself between the hose support part 20 and the opening 24 is used as the charging cylinder 22. At least the charging cylinder 22 is formed of a flexible member, and the lower end of the charging cylinder 22 is a free end. Therefore, the weight of the charging cylinder 22 is supported by the hose support part 20 (frame 2), does not affect the weight of the mixer 3, and does not reduce the weighing accuracy of the mixer 3. A discharge part 16 for discharging the cement milk in the mixer 3 is provided at a predetermined position in the lower part of the mixer 3, and the lower part of the discharge part 16 is connected to the agitator 4. A mixer discharge valve 27 is provided in the discharge part 16, and the mixer discharge valve 27 is opened and closed to discharge and supply the cement milk in the mixer 3 to the agitator 4.

[0011] A stirring blade 17 for stirring the cement milk is provided in the agitator 4, and the stirring blade 17 is driven to rotate by an agitator motor 4A. Thus, with respect to the relationship between the mixer 3 and the agitator 4 in the batcher plant 1, since the cement milk kneaded by the mixer 3 is put into the agitator 4 for temporary storage, the volume of the agitator 4 is formed to be larger than the volume of the mixer 3 so that the agitator 4 can receive the entire amount of the cement milk kneaded by the mixer 3. However, in the conventional batcher plant 1, it is sufficient if the agitator 4 can receive the cement milk kneaded by the mixer 3. For example, there is a configuration in which a cement milk detector 30 detects whether the amount of cement milk in the agitator 4 is the same as the volume of the mixer 3. Therefore, in the conventional batcher plant, detection of the cement milk at a certain water level in the agitator 4 was sufficient, and the water level of the cement milk was not detected in real time (constantly), so the current amount of cement milk in the agitator 4 was unknown.

[0012] As a result, when supplying the cement milk produced by the batcher plant 1 to a soil auger (not shown) for ground improvement, the optimum amount of cement milk could not be produced, and wasteful cement milk was produced. That is, at the construction site of the soil auger, the required amount of cement milk varies depending on the ground location. However, since the detected amount of the cement milk in the agitator 4 is constantly a fixed amount, it is produced in excess, and some of the cement milk is wasted. In the present invention, the amount of cement milk (water level W) in the agitator 4 mounted on the batcher plant 1 is constantly (in real time) acquired by the cement milk detector 30, and the cement milk can be discharged from the mixer 3 to the agitator 4 while considering the remaining amount in the mixer 3. <00???103>Therefore, even if the amount of cement milk in the mixer 3 is measured in a small amount, the inside of the agitator 4 can always be in a full state. As a result, even before the volume inside the agitator 4 decreases to the same volume as the volume of the mixer 3 as in the prior art, the mixer 3 can produce cement milk corresponding to the amount of cement milk in the agitator 4, and it becomes possible to efficiently generate cement milk.

[0013] Furthermore, the amount of cement milk in mixer 3 can be constantly measured by the weight measuring instrument 11, and the amount of cement milk in agitator 4 can be measured by the cement milk detector 30, making it possible to check the amount of cement milk (water level W) in mixer 3 and agitator 4 in real time from a location far from the batching plant 1 (remote location). In other words, since the amount of cement grout in the agitator 4 is detected in real time (constantly) by the cement grout detector 30, even before the amount of cement grout equivalent to the volume of mixer 3 in the agitator 4 is consumed by the earth auger, the amount of cement grout in the agitator 4 can be known in real time. This allows the mixer 3 to be operated at any time to perform cement grout mixing without waiting for the amount of cement grout equivalent to the volume of mixer 3 in the agitator 4 to be consumed, thus eliminating the waiting time for operating the conventional mixer 3 and improving work efficiency.

[0014] Furthermore, this allows for constant monitoring of the exact amount of cement grout stored (remaining amount) in the agitator 4. By comparing the amount required for ground improvement using the earth auger with the amount of cement grout stored (remaining amount) in the agitator 4, the mixer 3 can produce the required amount of cement grout, thus avoiding the production of unnecessary cement grout and, as a result, lowering the production cost of cement grout. In other words, the amount of cement milk stored in the agitator 4 can be maintained or increased regardless of the amount of cement milk mixed in the mixer 3, and in this respect as well, the efficiency of cement milk production can be improved.

[0015] Furthermore, even when it is necessary to produce cement grout with a different composition due to differences in ground improvement locations at construction sites, conventionally, the only option is to discard the cement grout that has already been produced. However, in the present invention, by measuring the amount of cement grout remaining in the agitator 4 and the amount of cement grout in the mixer 3, it is possible, in some cases, to supply the batching plant 1 with an amount of cement and / or water that results in a desired mixing ratio to the remaining cement grout, thereby producing cement grout with the desired composition. For example, when ground improvement at one point in a construction site requires a cement slurry thicker than that in agitator 4, a higher proportion of cement is supplied to mixer 3. Conversely, when ground improvement at another point in the construction site requires a cement slurry thinner than that in agitator 4, a higher proportion of water is supplied to mixer 3. This cement slurry from mixer 3 is then supplied to agitator 4. This makes it possible to produce cement slurry with different cement-to-water ratios without discarding the cement slurry in agitator 4.

[0016] Furthermore, the weight information from the weight measuring instrument 11 of the mixer 3 and the amount of cement milk detected by the cement milk detector 30 of the agitator 4 are configured to be constantly transmitted to a location away from the batching plant 1, such as an earth auger (not shown) at the construction site, via an information transmission means 31 provided on the control panel 32 of the batching plant 1. Therefore, batching plant 1 can be operated without the presence of workers, thereby reducing the number of personnel required in the cement milk manufacturing process. The configuration of the cement milk detector 30 is arbitrary; for example, it can be configured with an ultrasonic distance sensor or the like that can constantly detect the water level W without contacting the cement milk in the agitator 4.

[0017] Furthermore, when the cement milk detector 30 detects that the water level W (cement milk) in the agitator 4 has dropped to a volume equal to that of the cement milk in the mixer 3, it automatically opens the mixer discharge valve 27 of the mixer 3 and discharges the cement milk into the agitator 4. The cement milk detector 30 is connected to a control unit (controller (PLC)) 33 located in the control panel 32. In Figure 8, 3A is the motor for the mixer 3, 4A is the motor for the agitator 4, 6B is the water supply motor that supplies water to the mixer 3, 35 is the start button for the control panel 32, and 36 is the valve opening / closing sensor.

[0018] (Effect of the embodiment) <Normal operation> The present invention has the above configuration, in which a batching plant 1 is transported and installed at or near the work site for pile driving or ground improvement, a cement silo 5 and a water storage tank 6 are installed near the batching plant 1, the transport hose 8 of the cement silo 5 is connected to the mixer 3 of the batching plant 1, and the water supply hose of the water storage tank 6 is connected to the internal water supply pipe of the plant frame 2. With the on / off valve of the discharge section 16 of the mixer 3 closed, when the automatic start button 35 on the control panel 32 is operated to start the cement silo 5 and batching plant 1, the control unit 33 energizes the water supply pump 6B of the water storage tank 6 to supply the set amount of water per batch (per process) to the mixer 3, measures the weight of the mixer 3 with the weight measuring instrument 11 to detect the amount of water actually supplied to the mixer 3, and cuts off the power supply to the water supply pump 6B when the set amount of water per batch (per process) is reached.

[0019] Next, the amount of cement relative to the predetermined amount of water actually supplied to the mixer 3 is numerically input to the control panel 32. When the cement setting value is input to the control unit 33, the control unit 33 energizes the drive source 7 of the cement silo 5 and starts driving it. When the drive source 7 starts supplying cement, the weight measuring device 11 measures the increase in the weight of the mixer 3 at predetermined intervals to determine the weight of the cement being supplied and transported to the mixer 3. When the predetermined amount of cement has been supplied to the mixer 3, the control unit 33 cuts off the power supply to the drive source 7 of the cement silo 5 and stops the supply of cement.

[0020] Next, the control unit 33 energizes the mixer motor 3A of the batching plant 1 to drive the mixer 3 and kneads for a predetermined time until cement milk is formed. The control unit 33 then opens the mixer discharge valve 27 and discharges the cement milk into the agitator 4 for storage. In this case, the relationship between the mixer 3 and the agitator 4 in the batching plant 1 is such that the volume of the agitator 4 is larger than the volume of the mixer 3, and the agitator 4 is formed with a volume several times that of the mixer 3, so that the agitator 4 can receive all of the cement milk mixed by the mixer 3. For example, if the volume of mixer 3 is 1000 liters, the volume of agitator 4 is four times that, or 4000 liters. In this case, mixer 3 repeats the cement milk mixing process four times to fill agitator 4 with cement milk. The manufactured cement grout is sent to an earth auger or similar device, which is then used for pile driving or ground improvement work.

[0021] In this case, the relationship between the capacity of mixer 3 and agitator 4 in batching plant 1 is such that the agitator 4 receives and temporarily stores the cement grout mixed by mixer 3. Therefore, the receiving volume of agitator 4 must be larger than the discharge volume of mixer 3 so that the agitator 4 can receive the entire amount of cement grout mixed by mixer 3. However, in conventional batching plants 1, it is sufficient for the agitator 4 to be able to accept the cement milk mixed in the mixer 3. For example, the configuration was such that the amount of cement milk in the agitator 4 was detected by a cement milk detector 30 to determine whether or not it was the same as the volume of the mixer 3.

[0022] Therefore, in conventional batching plants, it is sufficient to detect a constant water level of cement grout in the agitator 4, but the water level of the cement grout cannot be detected in real time, and the current amount of cement grout in the agitator 4 is unknown. As a result, the cement grout detector 30 has to wait until it detects that the available volume of the agitator 4 is equal to the volume of the mixer 3 before discharging and supplying the cement grout mixed in the mixer 3 to the agitator 4. This means that while the cement grout is being mixed in the mixer 3, it cannot be discharged and supplied from the mixer 3 to the agitator 4, resulting in poor work efficiency. In other words, if the empty volume of the agitator 4 is 3500 liters, and 1000 liters of cement grout is being mixed in the mixer 3, the cement grout mixed in the mixer 3 cannot be discharged to the agitator 4. Therefore, the mixing operation in the mixer 3 has to start only after the cement grout detector 30 detects that the empty volume of the agitator 4 has reached 3000 liters, and this waiting time was reducing work efficiency.

[0023] In this invention, the cement milk detector 30 can continuously (in real time) measure the amount of cement milk in the agitator 4. Therefore, the amount of cement milk consumed in the agitator 4 can be predicted, and the mixing of the cement milk in the mixer 3 can be started in accordance with this predicted time, thereby improving the work efficiency of cement milk production. Therefore, even if the empty volume of the agitator 4 is 3500 liters, the control unit 33 predicts the consumption time based on the consumption time of cement milk from 4000 liters to 500 liters, and based on this predicted time, 1000 liters of cement milk can be mixed in the mixer 3, thereby reducing the waiting time for production in the mixer 3 and improving work efficiency.

[0024] <Manufacture of the desired amount of cement milk> In conventional batching plants, only cement grout at a certain water level in agitator 4 can be detected, so the current amount (remaining amount) of cement grout in agitator 4 was unknown. As a result, when supplying the cement grout produced by batching plant 1 to the earth auger (not shown) for ground improvement, the optimal amount of cement grout could not be produced, resulting in the production of wasted cement grout. Furthermore, when there was insufficient cement grout, additional cement grout had to be produced, which prevented pile driving and ground improvement work from being carried out during that time, leading to poor work efficiency.

[0025] In this invention, the amount of cement milk (water level W) in the agitator 4 mounted on the batching plant 1 is continuously acquired (measured) in real time by the cement milk detector 30, and cement milk can be discharged from the mixer 3 to the agitator 4 while taking into account the remaining amount in the mixer 3. Therefore, even when producing small amounts of cement milk using mixer 3, the agitator 4 can always be kept full. As a result, even before the volume of the agitator 4 decreases to match the volume of mixer 3, as in the conventional method, mixer 3 can produce cement milk in an amount that matches the amount of cement milk in the agitator 4, thus avoiding the production of wasted cement milk and enabling efficient cement milk production.

[0026] In other words, for example, if the capacity of the agitator 4 is 4000 liters and the capacity of the mixer 3 is 1000 liters, conventionally, when mixing 1000 liters of cement milk in the mixer 3 to produce one batch of 500 liters, the cement milk detector 30 detects that the amount of cement milk in the agitator 4 has decreased by 1000 liters and discharges cement milk from the mixer 3 to the agitator 4. However, in the present invention, the cement milk in the agitator 4 is discharged from the mixer 3 when it reaches 4000 liters - 500 liters = 3500 liters, so the agitator 4 can always be kept full, and cement milk can be produced without any wasted time. Furthermore, the amount of cement milk in mixer 3 can be constantly measured by the weight measuring instrument 11, and the amount of cement milk in agitator 4 can be measured by the cement milk detector 30, making it possible to check the amount of cement milk (water level W) in mixer 3 and agitator 4 in real time from a location far from the batching plant 1 (remote location).

[0027] In other words, since the amount of cement grout in the agitator 4 is detected in real time (constantly) by the cement grout detector 30, even before the amount of cement grout equivalent to the volume of mixer 3 in the agitator 4 is consumed by the earth auger, the amount of cement grout in the agitator 4 can be known, allowing the mixer 3 to be operated at any time to perform the cement grout mixing work without waiting for the amount of cement grout equivalent to the volume of mixer 3 to be consumed. This eliminates the waiting time required to operate the conventional mixer 3 and improves work efficiency. In other words, the amount of cement milk stored in the agitator 4 can be maintained or increased regardless of the amount of cement milk mixed in the mixer 3, and in this respect as well, the efficiency of cement milk production can be improved.

[0028] <Manufacturing of cement milk with different mixing ratios> Even when it is necessary to produce cement grout with a different composition due to differences in ground improvement locations at construction sites, conventionally, the only option is to discard the cement grout that has already been produced. However, in the present invention, by measuring the amount of cement grout remaining in the agitator 4 and the amount of cement grout in the mixer 3, it is possible, in some cases, to supply the mixer 3 with an amount of cement and / or water that results in a desired mixing ratio to the cement grout remaining in the mixer 3 and agitator 4, mix it in the mixer 3, and then supply it to the agitator 4, thereby producing cement grout with a desired composition ratio in the agitator 4.

[0029] For example, when improving the ground at point A of the construction site, if a cement slurry thicker than the one in agitator 4 is required, a higher proportion of cement is supplied to mixer 3. Conversely, when improving the ground at point B of the construction site, if a cement slurry thinner than the one in agitator 4 is required, a higher proportion of water is supplied to mixer 3. This cement slurry from mixer 3 is then supplied to agitator 4, making it possible to produce cement slurry with different cement-to-water ratios without discarding the cement slurry in agitator 4.

[0030] <Remote control> The weight information from the weight measuring instrument 11 of the mixer 3 and the amount of cement milk detected by the cement milk detector 30 of the agitator 4 are configured to be constantly transmitted to a location away from the batching plant 1, such as an earth auger, via an information transmission means 31 provided on the control panel 32 of the batching plant 1. As a result, the batching plant 1 can be operated without the presence of workers at the batching plant 1, thereby reducing the number of personnel required in the cement milk manufacturing process. Furthermore, when the cement milk detector 30 detects that the water level W (cement milk) in the agitator 4 has dropped to the amount that the cement milk volume in the mixer 3 can accommodate, the mixer discharge valve 27 of the mixer 3 is automatically opened, and the cement milk is discharged into the agitator 4. In this respect as well, the cement milk production process can be automated. [Explanation of Symbols]

[0031] 1...Batcher plant, 2...Plant frame, 3...Mixer, 3A...Mixer motor, 4...Agitator, 4A...Agitator motor, 5...Cement silo, 6...Water storage tank, 6A...Water supply hose, 6B...Water supply pump, 7...Drive source, 8...Transport hose, 8A...Input hose, 10...Mixing trough, 11...Weight measuring instrument, 12...Agitator blade, 13...Agitator shaft, 14...Top plate, 15...Rotation input member, 16...Discharge section, 17...Agitator blade, 20...Hose support section, 22...Input cylinder, 23...Lower end inlet, 24...Opening, 26...Discharge section, 27...Mixer discharge valve, 30...Cement milk detector, 31...Information transmission means, 32...Operation panel, 33...Control unit, 35...Start button, 36...Valve opening / closing sensor, W...Water level.

Claims

1. A mixer 3 for mixing water and cement to produce cement grout and an agitator 4 for temporarily storing the cement grout produced by the mixer 3 are attached to the plant frame 2. Near the mixer 3, a cement silo 5 for storing cement and a water storage tank 6 for storing water to be added to the cement are provided. The mixer 3 has a mixing tub 10 suspended within the plant frame 2 so as to be able to move up and down, and a weight measuring device 11 is attached to the mixing tub 10. The cement grout inside the mixer 3 is discharged from a predetermined position at the bottom of the mixer 3. The discharge section 16 is connected to the agitator 4, and the discharge section 16 is equipped with a mixer discharge valve 27. A cement milk detector 30 capable of constantly detecting the amount of cement milk in the agitator 4 is provided at a predetermined position on the agitator 4. Each of these parts is controlled by a controller, and the cement milk detector 30 constantly detects the remaining amount of cement milk in the agitator 4. Based on the remaining amount of cement milk, the mixer 3 is operated as needed to produce the required amount of cement milk and discharge it to the agitator 4.

2. A method for producing cement milk in a batching plant, in which water and cement are supplied to a mixer 3 and mixed for a predetermined time to produce cement milk, and the cement milk produced in the mixer 3 is discharged and supplied to an agitator 4 located below the mixer 3, wherein the agitator 4 is equipped with a cement milk detector 30 that constantly detects the amount of cement milk in the agitator 4, the cement milk detector 30 constantly detects the remaining amount of cement milk in the agitator 4, and the mixer 3 is operated as needed based on the remaining amount of cement milk to produce the required amount of cement milk and discharge it to the agitator 4.

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