JP3680003B2 - Light specific gravity particle feeding device, cement milk production device and cement milk production method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a light specific gravity particle feeding device, a cement milk production device, and a cement milk production method, and more specifically, a light specific gravity particle feeding device for feeding light specific gravity particles such as biomass and cement powder, and cement powder. The present invention relates to a cement milk manufacturing apparatus and a cement milk manufacturing method for supplying and kneading a body and water.
[0002]
[Prior art]
In recent years, a system has been proposed in which a fibrous light specific gravity particle obtained by pulverizing biomass is gasified as a raw material, and the resultant synthesis gas is processed to obtain, for example, methanol or liquid hydrocarbon. A supply device is used in which such finely pulverized biomass is supplied to a hopper, dropped into a lower screw feeder, and air-conveyed from the screw feeder to a gasification furnace. Similarly, a device for transporting light specific gravity particles such as cement powder is also used which is dropped from a hopper onto a lower screw feeder and transported by the screw feeder.
[0003]
As an apparatus for producing cement milk by kneading cement powder and water, for example, a cement milk plant as shown in FIG. 5 is known.
This cement milk plant 100 manufactures cement milk by kneading the water supplied from the water supply line 103 to the cement powder stored in the silo 102, and a charge hopper 104 that temporarily stores the cement powder. A pair of mixing tanks 105 and 105 for kneading the cement powder supplied from the charge hopper 104 and water, and a charge tank 106 for temporarily storing the cement milk produced in the mixing tank 105 It consists of
[0004]
In the cement milk plant 100, the cement powder supplied from the silo 102 is first stored in the charge hopper 104. A measuring feeder 107 and a cushion tank 108 are interposed between the charge hopper 104 and the mixing tank 105, and the cement powder discharged from the charge hopper 104 is measured by the measuring feeder 107 and kept in a fixed quantity. It is supplied to the cushion tank 108. The fixed amount of cement powder stored in the cushion tank 108 is further supplied to either the left or right mixing tank 105.
[0005]
In the mixing tank 105, a fixed amount of cement powder and a predetermined amount of water are kneaded by the mixer 110, thereby producing cement milk of a constant quality. This cement milk is supplied to the charge tank 106. In the charge tank 106, the state where the cement milk is always supplied from the mixing tank 105 is maintained, so that the cement milk can be continuously supplied from the charge tank 106 to the outside.
[0006]
[Problems to be solved by the invention]
However, the above-described conventional light specific gravity particle feeding device has a complicated structure of a delivery mechanism for sending light specific gravity particles by a predetermined amount, requires high technology, and further simplification is desired.
Moreover, since the conventional screw feeder which sends light specific gravity particle | grains generally is installed horizontally, when wash | cleaning with water, there exists a problem that a light specific gravity particle is clogged and does not flow easily, and cleaning work is difficult.
Further, in the conventional cement milk manufacturing apparatus (cement milk plant) as shown in FIG. 5, since there are many portions where cement milk is accumulated such as the mixing tank 105 and the charge tank 106, cement adheres particularly at the gas-liquid boundary portion.・ There is a problem that it is hardened, which requires a long time for maintenance such as cleaning, and the entire operation time is reduced.
[0007]
Moreover, since this cement milk plant has a pair of mixing tanks 105, 105, a charge tank 106, a cushion tank 108, etc., the apparatus becomes large and a problem arises in space utilization. In particular, when this cement milk plant is installed in a ship with limited space, such a problem becomes more prominent.
Furthermore, since this cement milk plant is formed by a combination of various devices such as the above-mentioned various devices and a pressurizing / transporting pump for transporting cement powder and cement milk between them, operation control is performed. It becomes complicated and there is a problem in operability.
[0008]
The present applicant has already proposed a novel curing agent manufacturing apparatus that solves the above problems (see Japanese Patent Application No. 2000-36744). This device is a charge hopper for storing cement powder, a weighing feeder that measures and transports cement powder discharged from the charge hopper, and is connected to the weighing feeder to continuously produce cement milk. It consists of a cement milk making machine. Moreover, this cement milk manufacturing machine is roughly comprised by the continuous supply machine for supplying cement continuously, and the screw conveyor for hardening agent manufacture connected to this continuous supply machine. The present invention is a further improvement of this prior invention.
[0009]
That is, an object of the present invention is to provide a light specific gravity particle feeding device that accurately sends light specific gravity particles by a predetermined amount with a simple configuration.
Another object of the present invention is to provide a light specific particle feeding device that facilitates the cleaning operation.
Another object of the present invention is to provide a cement milk production apparatus in which the apparatus is miniaturized and maintenance is facilitated.
Another object of the present invention is to provide a method and apparatus for producing cement milk that enables the quantitative supply of cement milk in cement milk and enables the production of high-quality cement milk by simple operation control. is there.
[0010]
[Means for Solving the Problems]
In order to solve such a problem, the first aspect of the present invention is a light specific gravity particle feeding device that continuously and quantitatively feeds light specific gravity particles.
A stirring chamber formed into a cylindrical shape and receiving and stirring the light specific gravity particles;
A quantitative discharge means disposed below the stirring chamber so as to be rotatable about the cylindrical axis, and capable of discharging a predetermined amount of the light specific gravity particles in the outer circumferential direction;
A discharge port opened on the outer peripheral side of the bottom of the stirring chamber
The first gist is to quantitatively supply light specific gravity particles in the stirring chamber .
[0011]
According to this invention, the stirring chamber that receives and stirs the light specific gravity particles is formed in a cylindrical shape, a discharge hole is formed on the outer peripheral side of the bottom surface of the stirring chamber, and the cylindrical shaft center is centered below the stirring chamber. As the fixed amount discharge means is rotatably provided, the fixed amount discharge means rotates about the axis, thereby discharging a predetermined amount of light specific gravity particles in the outer peripheral direction and supplying the light specific gravity particles in a fixed amount from the discharge hole. be able to.
[0012]
Therefore, in the present invention, since the stirring chamber for receiving and stirring the light specific gravity particles is formed in a cylindrical shape, the quantitative discharge means can be provided so as to be rotatable around the cylindrical axis, and the accurate configuration can be achieved with a simple configuration. The light specific gravity particles can be quantitatively supplied in predetermined amounts.
[0013]
The fixed amount discharging means may have any shape as long as it can take in a predetermined amount of light specific gravity particles accumulated on the outer peripheral end rotating from the rotation axis and carry it out to the outer peripheral side. For example, as shown in FIGS. 4 (a) and 4 (b), a plurality of discharges extending at predetermined angles that are equally divided 360 ° outward from the rotation axis, such as fixed discharge blades 19 and 19 ′. A blade is desirable.
[0014]
In addition, as long as the discharging means is extended at a predetermined angle evenly divided outward from the rotation axis, even if it extends radially, it has a concave portion in the rotation direction and is curved. It may be curved or may have a convex portion with respect to the rotation direction and bend.
[0015]
The second aspect of the present invention is to provide a light specific gravity particle supply chamber for supplying light specific gravity particles to the stirring chamber above the stirring chamber,
Measuring means for detecting the load of the cylindrical stirring chamber,
The light specific gravity particles are supplied to the stirring chamber while measuring the light specific gravity particles in the light specific gravity particle stirring chamber .
[0016]
According to such technical means, the light specific gravity particles in the light specific gravity particle stirring chamber can be supplied to the stirring chamber in an appropriate amount while measuring the light specific gravity particles.
[0017]
In addition, a screw feeder having a receiving port for receiving the light specific gravity particles and disposed in the conveying direction is provided, and the receiving port and the discharge port are spaced apart from each other by a predetermined distance and are arranged in a non-contact manner by separate members. It is desirable.
[0018]
According to such technical means, since the inlet of the screw feeder and the outlet of the stirring chamber are spaced apart from each other by a predetermined distance and are arranged in a non-contact facing manner as separate members, the weight on the inlet side of the screw feeder is converted. There is no need for calculation, and the configuration is simple.
[0019]
Moreover, it is desirable that the screw feeder is disposed with a downward slope in the conveying direction. According to this technical means, since the screw feeder is inclined downward, the light specific gravity particles can be smoothly conveyed.
[0020]
And it is desirable to provide in the upstream of the screw feeder with a washing water inlet through which washing water is injected. According to such technical means, since the screw feeder is downwardly inclined, the light specific gravity particles can be smoothly conveyed, and the washing water injected from the washing water inlet at the time of washing becomes easy to flow, so that the washing is surely performed. it can.
[0021]
Further, the second invention is a cement milk production apparatus for producing cement milk by kneading cement milk and water.
A charge hopper for storing cement powder;
A metering device for quantitatively feeding cement powder discharged from the charge hopper while metering;
A screw feeder connected to the weighing device and arranged in a downward inclination in the conveying direction;
A first water addition port and a second water addition port which are provided at two locations on the upstream side and the downstream side of the screw feeder and into which the addition water is injected
An air vent hole located between the first water addition port and the second water addition port;
A cement milk supply pump connected to the discharge port of the screw feeder.
[0022]
According to such an invention, the cement powder discharged from the charge hopper is connected to a metering device for metering the cement powder, supplied to the screw feeder disposed at a downward slope in the transport direction, and transported downstream. Since the first water addition port and the second water addition port through which the added water is injected are provided at two locations on the upstream side and the downstream side of the screw feeder, only the first water addition port on the upstream side is cement powder. To supply a sufficient amount of the added water with respect to the transport amount, a high level of technology is required.
[0023]
That is, when there is too much cement powder, the cement becomes ball-shaped and accumulates on the downstream side, making it impossible to produce cement milk. When there is too little cement powder, thin cement milk is produced. Therefore, the second water addition port is also provided on the downstream side, and water is filled from the upstream side to the downstream side during cement milk production. The cement powder passes through the screw feeder filled with water while being pressed in the conveying direction with a downwardly inclined screw feeder, so if a suitable amount of cement powder is supplied in that state, a good cement milk is produced. The The cement is kneaded and reliably conveyed to the discharge port, and it is possible to continuously produce cement milk in the screw feeder, eliminating the need for a mixing tank or charge tank, making the device simple and compact. Can be
[0024]
In the present invention, an air vent hole is provided between the first water addition port and the second water addition port. Therefore, prior to the cement supply, air can be driven from both the first water addition port and the second water addition port by the air vent hole, and the air can be extracted, so that product defects due to air accumulation can be eliminated.
[0025]
The weighing device includes a cylindrical main body having a discharge port formed at the bottom, a stirring blade and a discharge blade that rotate in the main body, and a weighing unit that detects a load on the main body. Configuration is also an effective means of the present invention.
[0026]
According to such technical means, the weight of the light specific gravity particles in the weighing device can be detected by the load cell, and the discharge amount of the charge hopper is controlled by this detection signal, so that a constant amount of light specific gravity is always provided in the main body of the weighing device. Particles can be supplied and a predetermined amount of cement powder can be supplied to the screw feeder.
[0027]
The third invention is a cement milk production method for producing cement milk by kneading cement milk and water.
Water is injected into the screw feeder from the first and second water addition ports provided at two locations on the upstream side and the downstream side of the screw feeder disposed in a downward inclination in the conveying direction, and the screw feeder is filled. An additive water filling process,
A cement powder supply step for quantitatively supplying cement powder to the screw feeder filled with water while measuring the cement powder;
A cement kneading step of rotating the screw of the screw feeder to knead water and cement powder to produce cement milk;
And a cement milk discharge step of discharging the manufactured cement milk from the discharge port to the cement milk supply pump.
[0028]
According to this invention, since the cement powder passes through the screw feeder filled with water while being pressed in the conveying direction by the downwardly inclined screw feeder, the cement is reliably conveyed to the discharge port while being kneaded. , Cement milk can be continuously produced in the screw feeder, and the production process in the mixing tank and charge tank is not required. Therefore, operation control is simplified and the cement milk can be produced efficiently. .
[0029]
In addition, after driving the cement milk supply pump, water is injected into the screw feeder from the first and second water addition ports, and formed between the first water addition port and the second water addition port. It is also an effective means of the present invention to include a step of removing air from the air vent hole.
[0030]
According to such technical means, by supplying water from the first and second two water addition ports, air is surely released from the air vent hole, and product defects due to air accumulation can be eliminated.
[0031]
Further, it is also possible to control so that the water supply to the second water addition port is stopped when the pressure of the second water addition port on the downstream side of the screw feeder becomes larger than the pressure of the first water addition port. It is an effective means of the invention.
[0032]
According to this technical means, when the pressure of the second water addition port becomes larger than the pressure of the first water addition port, it becomes difficult for water from the upstream side to flow. That is, the cement milk water is returned from the outer peripheral side of the screw feeder, and the water supplied from the downstream side is supplied to the cement milk supply pump side, so that clean cement milk cannot be supplied. Stop supplying.
[0033]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. However, the dimensions, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention, but are merely illustrative examples, unless otherwise specified. Absent.
FIG. 1 is an overall system configuration diagram of a cement milk production apparatus according to an embodiment of the present invention, FIG. 2 is a longitudinal side view showing details of essential parts, FIG. 3 is a longitudinal side view of a weighing apparatus, and FIG. 3 is a sectional view taken along line VI-VI in FIG.
[0034]
As shown in FIG. 1, the cement milk manufacturing apparatus of the present embodiment includes a charge hopper 1 in which cement powder is stored, a weighing device 2 that measures and agitate cement powder, and a cement powder. A screw feeder 3 for mixing and continuously supplying water, an additive water pump 4 for supplying water to the screw feeder 3, a cement milk supply pump 5 for supplying cement milk produced by the screw feeder 3, A kneader 6 for kneading cement milk and soil from the cement milk supply pump 5, a washing pump 7 for supplying washing water, a screw feeder washing header 8, a kneader washing header 9, and added water And an additive water header 11 for supplying the same.
[0035]
As shown in FIG. 3, the weighing device 2 installed below the charge hopper 1 has a tapered enlarged portion 10a formed in the lower part of a cylindrical main body portion 10, and a discharge port is formed on the bottom surface of the enlarged portion 10a. 12 is formed. A flange 13 provided on the outer periphery of the main body 10 is placed on a load cell 15 provided on a support frame 14.
[0036]
A shaft 17 of a motor 16 provided below the main body portion 10 is inserted into the main body portion 10, and a stirring blade 18 is attached to the upper portion of the shaft 17, and a lower portion thereof as shown in FIG. A fixed discharge vane 19 is attached. Further, as shown in FIG. 4B, a single plate may be press-molded leaving the blade portion 19 '.
[0037]
The lower portion of the discharge port 12 is disposed on the transport cylinder 20 connected to the screw feeder 3 with a slight gap 21. In other words, the receiving port 21a and the discharge port 12 of the transport cylinder 20 are spaced apart from each other by a predetermined distance and are arranged in a noncontact manner by separate members. Thereby, the main-body part 10 is mounted in the load cell 15 in the free state. Cement powder 22 is supplied from the charge hopper 1 into the main body 10 and stirred by the stirring blade 18 rotated by the motor 16, and the lower quantitative discharge blade 19 pushes the cement powder 22 to the discharge port 12. The fixed amount is discharged from the discharge port 12 to the conveying cylinder 20. The load cell 15 can measure the weight of the entire main body 10, thereby constantly measuring the weight of the internal cement powder 22.
[0038]
As shown in FIGS. 1 and 2, the screw feeder 3 includes an upper screw 26 and a lower screw 27 inserted in a cylindrical casing 25, and the screws 26 and 27 are connected to motors 28 and 29, respectively. Yes. The screw feeder 3 is installed with a high inclination on the weighing device 2 side and a low discharge port 30 side, that is, with a downward slope in the conveying direction.
[0039]
A plurality of cleaning water inlets 31 are formed near the upstream of the meter feeder 2 of the screw feeder 3, and a cleaning pipe 32 is connected to the cleaning water inlet 31. The water in the water tank 33 is supplied to the cleaning pipe 32 from the cleaning pump 7 through the cleaning header 8.
[0040]
Further, a first water addition port 35 is provided in the upstream portion of the screw feeder 3, and a second water addition port 36 is provided in the downstream portion. Addition water pipes 37 and 38 are connected to the first water addition port 35 and the second water addition port 36, respectively. The water in the water tank 33 is supplied to the added water pipes 37 and 38 from the added water pump 4 through the added water header 11. The addition water pipes 37 and 38 are respectively provided with a flow rate control valve 41 and an on-off valve 42.
[0041]
A conveying pipe 45 is connected between the discharge port 30 of the screw feeder 3 and the cement milk supply pump 5 via an opening / closing valve 44. The casing 25 of the screw feeder 3 is formed with an air vent hole 46 located between the first water addition port 35 and the second water addition port 36, and the cement milk supply pump 5 is connected to the air vent hole 46. A communicating air vent pipe 47 is connected. The air vent pipe 47 is provided with an on-off valve 51 and a transparent sight window 48 so that water passing through the air bleed pipe 47 can be visually observed from the sight window 48.
[0042]
Next, the operation will be described based on the above configuration.
First, water supply to the screw feeder 3 and air bleeding are performed. By closing the on-off valve 44, opening the on-off valve 51, and driving the addition water pump 4, water is supplied into the casing 25 from the first water addition port 35 and the second water addition port 36, so that air is supplied to both sides. It is pushed by water and escapes to the air vent hole 46 side.
[0043]
Here, by driving the cement milk supply pump 5, air in the casing 25 of the screw feeder 3 is released, and water flows into the air vent pipe 47 from the air vent hole 46 after the air. That is, since the on-off valve 44 is closed, when water is supplied from the pump 4 to the screw feeder 3 via the addition water pipes 37 and 38, the water is supplied to the first water addition port 35 and the second water addition port 36. From inside the casing 25, the casing 25 is filled while colliding in the casing 25.
[0044]
In the process of filling the casing 25 with water, the air in the casing 25 escapes from the air vent hole 46 through the air vent pipe 48. When all the air is released, the water is subsequently removed from the air vent hole 46 through the air vent pipe 47, and this can be seen through the viewing window 48. In this state, it can be confirmed that the air has completely escaped. If the on-off valve 51 is closed at this time, air will escape into the casing 25 and water will be filled. When the on-off valve 44 is opened, the water in the casing 25 is sucked by the cement milk supply pump 5.
[0045]
On the other hand, in the charge hopper 1, the motor of the rotary valve 1 a is rotated to continuously discharge the cement powder stored in the charge hopper 1 into the main body 10 of the weighing device 2. The stirring blade 18 is rotated by the rotation of the motor 16 of the metering device 2 to stir the cement powder, and the cement powder is discharged from the discharge port 12 by a certain amount by the rotation of the fixed discharge blade 19, and is screwed from the conveying cylinder 20. Supplied to the feeder 3.
[0046]
In the weighing device 2, the load cell 15 constantly detects the weight of the cement powder in the main body 10, and the motor of the rotary valve 1 a of the charge hopper 1 is controlled by this detection output. The amount of cement is kept constant, whereby a fixed amount is supplied from the discharge port 12.
[0047]
By turning on the motors 28 and 29 of the screw feeder 3 and rotating the screws 26 and 27, the cement powder fed into the screw feeder 3 is mixed with water by the screws 26 and 27 and kneaded into the discharge port 30. The cement milk conveyed and kneaded through the on-off valve 44 is sucked by the cement milk supply pump 5 and sent to the kneader 6.
[0048]
In this case, if the suction pressure regulator of the cement milk supply pump 5 is set higher than the pressure of the additive water pump 4, the cement milk discharge port is smoothly performed. The added water is continuously supplied from the added water pipes 37 and 38 while the flow rate is controlled to an optimum flow rate for kneading by the flow rate control valve 41 whose passage opening is controlled by the flow meter 52 and the pressure control valve 42 whose opening and closing is controlled by the pressure gauge 53. Supplied.
[0049]
The pressure at the second water addition port 36 of the screw feeder 25 is detected by the pressure gauge 53, but when this pressure becomes higher than the predetermined pressure at the first water addition port 35, it is difficult for water from the upstream side to flow. Become. That is, the cement milk water is returned from the outer peripheral side of the screw feeder, and the water supplied from the downstream side is supplied to the cement milk supply pump side, so that clean cement milk cannot be supplied, so the solenoid valve 42 is closed. Then, the water supply to the downstream side is stopped.
[0050]
In the kneader 6, the cement milk and the soil conveyed from the soil conveyance path 50 are kneaded.
[0051]
When the cement milk manufacturing process is completed and cleaning is performed, cleaning water is supplied from the cleaning pump 7 to the screw feeder 3 via the screw feeder cleaning header 8, and the on-off valve 44 is opened to drain water from the discharge port 30. Further, the kneading machine 6 is supplied with washing water from the kneader washing header 9 and drains from the discharge port 49.
[0052]
In the above embodiment, the cement milk manufacturing apparatus has been described. However, the charge hopper 1, the weighing apparatus 2, and the screw feeder 3 can be used as a feeding apparatus for biomass and other light specific gravity particles in addition to cement powder. is there. In this case, since the screw feeder 3 is inclined downward, the light specific gravity particles can be smoothly conveyed, and the washing water can easily flow during the washing, so that the washing can be performed reliably. In the above embodiment, a configuration using two separated screws 26 and 27 is shown, but only one screw may be used.
[0053]
【The invention's effect】
As described above, according to the light specific gravity particle feeding device of the present invention, the stirring chamber for receiving and stirring the light specific gravity particles is formed in a cylindrical shape, and a discharge hole is opened on the outer peripheral side of the bottom surface of the stirring chamber, A fixed amount discharging means is provided below the stirring chamber so as to be rotatable around the cylindrical axis, and the fixed amount discharging means rotates around the axis to discharge a predetermined amount of light specific gravity particles in the outer circumferential direction. Therefore, the quantitative discharge means can be provided so as to be rotatable around the cylindrical axis, and the light specific gravity particles can be accurately supplied in a predetermined amount with a simple configuration.
[0054]
In addition, according to the cement milk production apparatus and method of the present invention, the screw feeder for sending cement powder is provided with a downward inclination in the conveying direction, so that the cement powder is pressurized in the conveying direction with the downward inclined screw feeder while the water is being pressed. The cement passes through the screw feeder filled with water and is reliably transported to the discharge port while being kneaded in the screw feeder. Since no charge tank is required, the apparatus can be simplified and miniaturized.
[0055]
Moreover, the air located between the 1st water addition port and the 2nd addition water port which are provided in two places of the upstream and downstream of the screw feeder arrange | positioned by the downward inclination in the conveyance direction and in which addition water is inject | poured. Since the vent hole is provided, by supplying water from the first and second water addition ports, air is surely released from the air vent hole, and product defects due to air accumulation can be eliminated. effective.
[Brief description of the drawings]
FIG. 1 is a system configuration diagram of a cement milk production apparatus according to an embodiment of the present invention.
FIG. 2 is a longitudinal sectional side view showing details of a main part of FIG.
FIG. 3 is a longitudinal side view of the weighing device.
4 is a cross-sectional view taken along the line IV-IV in FIG. 3;
FIG. 5 is a system configuration diagram of a conventional cement milk production apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Charge hopper 2 Weighing device 3 Screw feeder 5 Cement milk supply pump 10 Main part (stirring chamber)
12 Discharge port 15 Load cell 18 Agitation blade 19 Fixed discharge blade (fixed discharge means)
30 Discharge port 31 Wash water inlet 35 First water addition port 36 Second water addition port 46 Air vent hole

Claims (9)

In the light specific gravity particle feeding device that continuously and quantitatively feeds light specific gravity particles,
A stirring chamber formed into a cylindrical shape and receiving and stirring the light specific gravity particles;
A quantitative discharge means disposed below the stirring chamber so as to be rotatable about the cylindrical axis, and capable of discharging a predetermined amount of the light specific gravity particles in the outer circumferential direction;
A discharge port opened on the outer peripheral side of the bottom of the stirring chamber
Furthermore, while providing a light specific gravity particle supply chamber for supplying light specific gravity particles to the stirring chamber above the stirring chamber,
Measuring means for detecting the load of the cylindrical stirring chamber,
A light specific gravity particle feeding device that supplies light specific gravity particles to the stirring chamber while measuring the light specific gravity particles in the light specific gravity particle stirring chamber .   A screw feeder having a receiving port for receiving the light specific gravity particles and disposed in a conveying direction, wherein the receiving port and the discharge port are spaced apart from each other by a predetermined distance and are arranged in a non-contact manner by separate members from each other; The light specific gravity particle feeding device according to claim 1, wherein: The light specific gravity particle feeding device according to claim 2, wherein the screw feeder is disposed in a downward inclination in the conveying direction. The light specific gravity particle feeding device according to claim 3, further comprising a cleaning water injection port into which cleaning water is injected on an upstream side of the screw feeder. In a cement milk production apparatus for producing cement milk by kneading cement milk and water,
A charge hopper for storing cement powder;
A metering device for quantitatively feeding cement powder discharged from the charge hopper while metering;
A screw feeder connected to the weighing device and arranged in a downward inclination in the conveying direction;
A first water addition port and a second water addition port which are provided at two locations on the upstream side and the downstream side of the screw feeder and into which the addition water is injected
An air vent hole located between the first water addition port and the second water addition port;
A cement milk production apparatus comprising: a cement milk supply pump connected to a discharge port of the screw feeder. The weighing device includes a cylindrical main body having a discharge port formed at the bottom, a stirring blade and a discharge blade rotating in the main body, and a weighing unit that detects a load on the main body. The cement milk manufacturing apparatus according to claim 5 . In a method for producing cement milk for producing cement milk by kneading cement milk and water,
Water is injected into the screw feeder from the first and second water addition ports provided at two locations on the upstream side and the downstream side of the screw feeder disposed in a downward inclination in the conveying direction, and the screw feeder is filled. An additive water filling process,
A cement powder supply step for quantitatively supplying cement powder to the screw feeder filled with water while measuring the cement powder;
A cement kneading step of rotating the screw of the screw feeder to knead water and cement powder to produce cement milk;
A cement milk manufacturing method comprising: a cement milk discharging step of discharging the manufactured cement milk from a discharge port to a cement milk supply pump. After driving the cement milk supply pump, water is injected into the screw feeder from the first and second water addition ports, and air is formed between the first water addition port and the second water addition port. The method for producing cement milk according to claim 7 , further comprising a step of extracting air from the hole. Control is made to stop the supply of water to the second water addition port when the pressure of the second water addition port on the downstream side of the screw feeder becomes larger than the pressure of the first water addition port. The method for producing cement milk according to claim 7 .

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