JPS6357564B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for continuously producing a stable liquid.

Mud water is used as a stabilizing liquid in underground wall construction methods. This muddy water is a slurry made by mixing, dissolving and dispersing the main raw materials of powder or granules in liquid such as water. Conventionally, in order to manufacture this, each raw material was mixed in a batch mixer. was. For this reason, when supplying the main powder raw material, dust is generated when the bag is opened, and weighing requires manpower and time, continuous supply is not possible, and the entire device requires a large area. The running cost was also very high.

This invention was made in consideration of the above circumstances, and is capable of fully automatic operation, capable of continuously supplying a fixed amount of a completely stable liquid without the need for human intervention, low running costs, and equipment. To provide a stable liquid continuous production device which is compact as a whole, requires only a small space for equipment, and is easy to transport and install a large silo for storing powder or granules as a main raw material.

The present invention will be described below based on illustrated embodiments.

In the figure, 1 indicates a silo, which stores bentonite powder, which is the main raw material for muddy water as a stabilizing liquid, and is installed separately from a base 2, which will be described later. This silo 1 stores bentonite transported by a tank truck C or the like from above, and is operated by the vibration of a vibrodischarger 3 provided at the bottom and the action of a screwdriver 4 following this. Then, the stored bentonite is discharged into the hopper 5 in appropriate amounts. The hopper 5 is provided with a friudizer 8 connected in series to a roots blower 6 and a dryer 7. The friudizer 8 uses the introduced pressurized air to circulate bentonite in the hopper 5. The air is conveyed through the feed pipe 9 to a predetermined height of the base 2. Inside the silo 1, there are level switches 10a, 10 for detecting the full volume, hollow volume, and fixed amount of the silo.
b, 10c, and below the silo 1 are an operation panel 11 and a display panel 1 for each of the actuators.
2 are provided.

A pedestal 13 is erected on the base 2, and a holding bin 15 for bentonite having a bag filter 14 is provided thereon, and the bentonite conveyed by air from the wheel feed pipe 9 is placed in the holding bin 15. be guided. Inside this holding bin 15 are upper, middle, and lower level switches 16 that detect the amount of bentonite there.
a, 16b, and 16c, and a screw feeder (quantity supply feeder) 17 is provided below the holding bin 15.
This screw feeder 17 feeds the bentonite in the holding bin 15 into the introduction pipe 19 of the kneader 18 in a predetermined amount.

In addition, on the base 2, there are cut tanks 20 and 21 that store powder CMC and a dispersant as a muddy water conditioner.
are installed, and the CMC and dispersant in the bag are manually poured into these cutting tanks 20 and 21 from above. Tube conveyors 22 and 23 are connected to the bottoms of these cutting tanks 20 and 21,
These tube conveyors 22 and 23 feed the CMC and dispersant in the cut tanks 20 and 21 into holding bins 24 and 25, respectively. The holding bins 24 and 25 are equipped with a vibrator that smoothly lowers the CMC and dispersant introduced from above.
4, 25 have upper, middle, and lower level switches 26 that detect the amount of CMC and dispersant there.
a, 26b, 26c; 27a, 27b, 27c are provided, respectively. Holding bin 2
4, 25 are equipped with screw feeders (quantity supply feeders) 28, 29,
These screw feeders 28 and 29 feed the CMC and dispersant in the holding bottles 24 and 25 into the introduction pipe 19 of the kneader 18 in predetermined amounts. By the way, since CMC and dispersant have water absorption properties, the screw feeder 28 or 29 for CMC and dispersion is of a two-shaft self-cleaning type as shown in Fig. 6. This prevents CMC from adhering to the shaft and provides quantitative performance.

Further, a water tank 30 is installed on the base 2, and this water tank 30 is connected to a pressure reducing valve 31.
retain water supplied through the The bottom of the water tank 30 includes a liquid feed pipe 32, a metering pump 33,
A pipe is connected to a static mixer 39 via a diaphragm pressure gauge 34, a safety valve 35, a flow meter 36, a water addition solenoid valve 37, and a check valve 38 in order, and the water in the water tank 30 is supplied to the static mixer 39. Mixer 39
is supplied under pressure. Note that a return solenoid valve 40 that forms a return flow path into the clean water tank 30 is connected in the middle of the piping between the flow meter 36 and the water addition solenoid valve 37 .

Also, on the base 2, there is a 2
Two dispersant tanks 41 and 42 are installed. The upper parts of these dispersant tanks 41 and 42 are connected to a drum 45 containing a highly concentrated liquid dispersant via a liquid feed hose 44 equipped with a liquid feed pump 43, and are also connected to the water supply tank 45 through a water supply pump 46. The highly concentrated liquid dispersant in the drum can 45 and the clean water in the clean water tank 30 are piped to the tank 30 and are transferred to the dispersant tank 41 at a rate that dilutes the liquid dispersant by about twice. , 42. The dispersant tanks 41 and 42 are equipped with stirrers 47 and 48, so that the dispersant solution in the dispersant tanks 41 and 42 has a uniform concentration.

The bottoms of the dispersant tanks 41 and 42 are connected to the static valve via a liquid feed pipe 49, a metering pump 50, a diaphragm pressure gauge 51, a safety valve 52, a flow meter 53, a solenoid valve 54 for adding water, and a check valve 55 in this order. mixer 3
9, and dispersant tanks 41, 4.
The solution of the dispersant in the tank 30 is combined with the clean water from the clean water tank 30, and is supplied under pressure into the static mixer 39 at a predetermined ratio with the clean water. In addition, there are dispersant tanks 41 and 42 in the middle of the piping between the flow meter 53 and the solenoid valve 54 for adding water.
Return solenoid valve 56 forming a return flow path
is connected.

The static mixer 39 is connected to the annular chamber 58 on the outer periphery of the introduction pipe 19 through the water addition pipe 57, and is used to mix the clean water in the clean water tank 30 and the dispersant introduced into the static mixer 39. The solutions of the dispersant in the tanks 41 and 42 are mixed in the static mixer 39, and then delivered to the annular chamber 58 as an aqueous solution containing a predetermined proportion of the dispersant.
is supplied under pressure. The annular chamber 58 is connected to the introduction pipe 19
An annular opening discharge portion 59 facing downward along the inner wall of the
The aqueous solution communicated with the introduction pipe 19 by the annular chamber 58 and supplied under pressure into the annular chamber 58 is jetted downward along the inner wall of the introduction pipe 19 from the discharge part 59 located all around the inside of the introduction pipe 19. Then, the powdered bentonite, CMC, and dispersant are fed into the kneader 18 from above the introduction pipe 19.

The kneading machine 18 includes a rotationally driven horizontal screw 60 in a casing 61, and an inlet pipe 1.
an aqueous solution introduced into the casing 61 from 9;
Powdered bentonite, CMC, and dispersant are continuously dispersed and dissolved by the screw 60 and discharged from the outlet pipe 62. Screw 60
The blades of the introduction part l ₁ are formed by installing a flat bar 64 spirally around the outer periphery of the shaft 63, and the blades of the mixing part l ₂ of the screw 60 are formed by installing a round bar 65 spirally around the outer periphery of the shaft 63. It is made by planting
Further, the discharge portion _l3 of the screw 60 is not provided with a blade. For example, the flat bars 64 are planted twice for each round at a rate of 22 pieces per round, and the round bars 65 are planted in duplicate at a rate of 24 pieces per round, for example.
The powder and liquid introduced into the kneading machine 18 from the introduction pipe 19 are smoothly sent through the casing 61, and the former is fed more than the latter. It is sufficiently dispersed and dissolved in a short residence time of about seconds to form muddy water. Also, shaft 63
Discs 66 for draining water are attached to both ends.

A viscometer 67 is connected to the outlet pipe 62 of the kneader 18, and the muddy water discharged from the outlet pipe 62 is
Its viscosity is continuously measured by a viscometer 67, and then it is sent to a destination via a storage tank or the like by a pump or other transport device.

The base 2 is also provided with a control panel 68 for each of the actuators and various related devices on the base 2. Furthermore, the base 2 is provided with a housing 69 that covers the device on the base 2. This housing 69 has, for example, a ventilation fan and a door, and a portion covering the kneading machine 18 is removable.

According to the above configuration, each actuator is controlled by the operation panel 11 on the silo 1 side, which is installed separately from the base 2, and the control panel 68 on the base 2 side. Incidentally, in the conventional apparatus of this type, the control panel 68 was not provided on the base 2, and the silo 1 was installed on the base 2. The fact that the relatively large silo 1 is installed on the base 2 may cause problems in transporting the entire device on the base 2 all at once. In this respect, the fact that the silo 1 is installed separately from the base 2 is advantageous because it allows them to be transported individually without any problems.
In addition, if the silo 1 is divided into two parts, an upper part and a lower part, the upper part can be folded down and transported separately from the lower part.

By control from the operation panel 11 and the control panel 68,
Screw feeders 17, 28, and 29 each use bentonite as the main raw material and as a conditioning agent.
CMC and dispersant are quantitatively fed into the introduction pipe 19 of the kneader 18. At that time, since the screw feeder 28 or 29 for CMC and dispersant is of a two-shaft self-cleaning type, it prevents the adhesion of water-absorbing CMC and dispersant.
We will reliably send a fixed amount of it.

Further, the clean water in the clean water tank 30 is supplied under pressure into the annular chamber 58 of the introduction pipe 19 after adding the dispersant solution from the dispersant tanks 41 and 42 at a predetermined ratio. . Incidentally, this type of conventional apparatus was not equipped with dispersant tanks 41 and 42, and had no means for adding a fixed amount of a solution of a dispersant.

The aqueous solution supplied under pressure into the annular chamber 58 is ejected downward from the discharge part 59 extending all around the inner circumference of the introduction pipe 19, and the bentonite powder, CMC
and a dispersant into the kneader 18. At this time, the aqueous solution enters the kneader 18 along the inner wall of the introduction pipe 19 to prevent the powdered bentonite, CMC, and dispersant from adhering to the inner wall of the introduction pipe 19. By the way, for example, if the aqueous solution and powder are introduced into the kneader 18 through separate introduction pipes, the powder will adhere to the inner wall of the introduction pipe on the powder side, making it difficult to supply the powder in a fixed quantity. If the material is blocked or the adhered material aggregates into lumps and peels off and enters the kneading machine 18, it cannot be completely dissolved and dispersed, resulting in the generation of leftover powder. will occur. Therefore, in this respect, the introduction tube 19 of the present device
The structure of the parts can be said to be excellent.

The aqueous solution and powder that have entered the kneading machine 18 are first smoothly and widely conveyed by the flat bar 64, and then completely dispersed and dissolved by the round bar 65 to become muddy water, which is quickly and continuously conveyed from the outlet pipe 62. be discharged. Incidentally, this type of conventional apparatus uses a so-called batch mixer such as a propeller mixer equipped with a propeller 70 as shown in FIG. There are some drawbacks. In other words, propeller mixers can only mix at a limited concentration of CMC 0.4% or less, and it takes a lot of effort to dissolve and disperse the materials without liquid separation and without forming powder. time is required. In this respect, the kneading machine 18 of this apparatus
is excellent.

The viscosity of the muddy water discharged from the outlet pipe 62 of the kneader 18 is immediately and continuously measured by the viscometer 67. By the way, conventional devices of this type are not equipped with something similar to the viscometer 67, and in order to find out the viscosity of the muddy water that has been created, it is necessary to take a sample of the muddy water and measure its viscosity using a separately prepared viscometer. It was extremely troublesome to measure the temperature.

The muddy water that has passed through the viscometer 67 is sent to a destination by a pump or other conveying device after passing through a storage tank or the like.

Note that the housing 69 covers the device on the base 2 to prevent powder or granular raw materials from scattering to the outside.

As explained above, according to the stable liquid continuous production device according to the present invention, fully automatic operation is possible, and since there is no bag-opening operation when supplying the powder main raw material, no dust is generated. A stable liquid of a predetermined quality can be continuously supplied in a constant quantity without the need for manpower, the running cost is low, and the entire equipment is compact and requires little equipment space. Moreover, since the large silo for the main raw material is installed separately from the base, the silo and the base can be easily transported and installed separately. In addition, according to this stable liquid continuous production device, a conveyance mechanism is provided to pneumatically convey the powder or granules of the main raw material in the silo using pressurized air, so it is possible to continuously supply the powder or granules above the base. can. In addition, an annular chamber is provided on the outer periphery of the introduction pipe for introducing the powder or granules supplied quantitatively from the quantitative feeder into the kneading machine, and an annular chamber is provided at the inner periphery of this annular chamber to take in the liquid to be supplied to the kneading machine. Since a discharge portion is provided which opens downward and discharges the liquid in the annular chamber along the inner wall of the introduction tube, it is possible to prevent the powder or granules from adhering to the inner wall of the introduction tube. Thereby, the powder or granules can be completely dissolved and dispersed in the liquid in the kneader. Therefore, it is possible to produce a stabilized liquid in which the powder or granules are uniformly and completely dispersed, and the quality of the stabilized liquid can be improved. Conveyance can be carried out reliably and easily.

[Brief explanation of the drawing]

1 to 8 show an embodiment of the present invention, FIG. 1 is a flowchart of the entire device, FIG. 2 is a side view of the device on the base, FIG. 3 is a plan view thereof, and FIG. 4 is a front view of the kneading machine, Fig. 5 is a schematic explanatory diagram of the kneading machine part, Fig. 6 is a schematic explanatory diagram of the screw feeder for CMC and dispersant, Fig. 7 is a cross-sectional view of the introduction pipe of the kneading machine, Figure 8 is an enlarged partial sectional view of the kneading machine.
FIG. 9 is a schematic explanatory diagram of the propeller mixer. 1... Silo, 2... Base, 9... Wheel pipe, 1
7... Screw feeder (quantity supply feeder), 18... Kneading machine.

Claims (1)

[Claims] 1 A base 2, a silo 1 installed separately from the base for storing the main raw material powder or granules, and a silo 1 installed in this silo for processing the main raw material powder or granules in the silo. Conveying mechanisms 6, 7, 8, and 9 that pneumatically convey the air above the base using compressed air, and a fixed quantity feeder 17 that is installed on the base and supplies a fixed amount of the main raw material powder or granules from the conveying mechanism. A kneader 18 is installed on a base and takes in the powder or granules of the main raw material fed quantitatively from a metered feeder through an introduction pipe 19 and kneads it with a liquid; An annular chamber 58 for taking in the liquid to be supplied to the kneading machine; and an annular chamber 58 which is provided at the inner circumference of the annular chamber and opens downward, and the liquid in the annular chamber is discharged along the inner wall of the introduction pipe to be supplied into the kneading machine. 1. A continuous stabilizing liquid production apparatus characterized by comprising a discharge section 59.