JP2834669B2 - Powder kneading equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder kneading apparatus such as an apparatus for producing cement milk by mixing cement and water.

[0002]

2. Description of the Related Art Conventionally, when making cement milk or kneading powders or granules with water or liquid, put cement powder and an appropriate amount of water into a drum provided with stirring blades inside, and rotate the drum. It was common to stir the cement powder and water with stirring blades to form cement milk.

However, in such a case, when the cement powder is first put into the drum and then water is injected, the cement powder is liable to solidify at the corner of the drum with the injected water, and the homogeneous cement is mixed at a desired ratio. There was a problem that milk could not be formed. Conversely, when water is first poured into the drum and then cement powder is added, the cement powder is easily scattered around, and there is a problem that the worker sucks this or soils the periphery. .

In order to solve such a problem, for example, Japanese Patent Publication No. 4-69 proposed by the applicant of the present invention has been proposed.
No. 679 is known. The powder kneading apparatus described in this publication mainly kneads pulverized coal and water etc. to form a slurry-like fuel, and the pulverized powder flow is placed at the bottom of a pulverized powder storage tank storing the pulverized coal. An outlet is formed, and the powder outlet is hermetically connected to a powder supply port of a jet pump which forms a negative pressure by injecting a high-pressure liquid pressurized by a pressure pump. The fine coal in the powder storage tank is sucked from the powder outlet by the negative pressure generated by the pump, and is agitated and mixed thoroughly in the high-pressure liquid jet flow in the jet pump.

[0005]

However, according to the previous proposal made by the applicant of the present invention, the inside of the powder supply port where the negative pressure of the jet pump is formed is caused by the turbulent flow of water droplets of the jet flow. Because it is flying vertically and horizontally, some water droplets of this turbulent flow enter the granular material storage tank from the granular material outlet and wet the fine coal in the granular material storage tank. There was a problem that it would harden. Especially,
In the case of a fine powder that reacts with water, such as cement powder, the cement solidifies in the outlet of the granular material or in the storage tank of the granular material, and there has been a problem that the above-described problem is remarkably exhibited.

[0006] Further, the powder and granular material in the powder and granular material storage tank supplied from the powder and granular material outlet to the powder and granular material supply port adheres to the inner peripheral surface of the powder and granular material supply port and is solidified. Since the body supply port is gradually closed, not only is there a problem with durability,
There is a problem that the powder and granules are wasted as much as they adhere to and solidify on the inner peripheral surface of the powder and particle supply port.

Further, when detecting the mixing ratio between the powder and the granular material and the liquid, the mixed slurry is taken out, and the mixing ratio is detected by a viscometer or a skillful feeling. In the case of detection, it is troublesome and troublesome to temporarily stop the jet pump to perform, and there is a problem that it lowers the operating efficiency. the variation there has been a problem that the raw Jill. In view of the above, the present invention has been proposed in view of the above problems, and provides a kneading apparatus which can reliably knead even a powdery material such as cement which solidifies in response to a liquid, has excellent durability, and has no variation in products. It is intended to be able to do so.

[0008]

Means for Solving the Problems To achieve the above object, a powder and granule kneading apparatus according to the present invention comprises, first, a pressurizing pump for pressurizing a liquid, and a high -pressure pump pressurized by a pressurizing pump . comprising a jet pump creating a negative pressure by ejecting liquid, a powder or granular material reservoir tanks reservoir of granular material, the jet pump
Sprays the pressurized fluid from the spray nozzle to the protection tube,
The outside air is sucked by the negative pressure formed inside the
Mixed with the jet stream to form a mixed jet stream.
Jet stream into the suction pipe or mixing pipe
With a mixture jet pump that creates a negative pressure in the pipe
It is characterized in that the granular material outlet of the granular material storage tank faces the granular material supply port of the jet pump, and the granular material supply port facing the granular material outlet communicates with the atmosphere. Is what you do. Second, the mixing ratio between the liquid and the granular material is detected by a pressure change of a high-pressure fluid supplied from a pressurizing pump for pressurizing the liquid to a jet nozzle of a jet pump. is there.

Third, a bowl in which a powder supply port is opened upward.
A cleaning nozzle that is formed into a shape and sprays a cleaning liquid on the lower surface
One of the features is that the granular material storage tank is formed in a bottomed cylindrical shape , a granular material input port is formed in the upper opening, and the granular material discharge pressure is formed in the bottom portion. It is also characterized in that a fluid supply means for supplying a fluid is provided.

[0010]

First, the powder and granules are stored in the powder and particle storage tank, and the powder and granules can be supplied from the powder and particle outlet at the bottom of the powder and particle storage tank. Next, a high-pressure fluid pressurized by the pressurizing pump is supplied to the jet pump to form a negative pressure in the jet pump. When a negative pressure is thus formed in the jet pump, the external air is supplied from the particulate material outlet from the portion communicating with the atmosphere around the particulate material supply port where the particulate material outlet faces the negative pressure. The powder is sucked together with the granules, and the powder and granules and the outside air are surely stirred and mixed in the jet stream in the jet pump.

At this time, the droplets of the jet stream flowing through the powder supply port facing the powder outlet are pushed into the powder supply port by the sucked outside air, and the powder discharge port It does not adhere to the surface. Also, when the liquid obtained by kneading the granules is returned to the pressurizing pump and circulated again, the viscosity increases with an increase in the kneading ratio of the granules, and the pressurizing pump pressurizes the liquid from the jet pump. , The pressure of the high-pressure fluid supplied to the injection nozzle gradually increases. Due to the change in the rising pressure, the mixing ratio between the liquid and the granular material can be easily and accurately detected.

Further, in the case where the granular material supply port is formed in a bowl shape having an upper opening, and a cleaning nozzle for jetting a cleaning liquid is provided on the lower surface, the granular material supplied from the granular material outlet is provided. The cleaning water sprayed from the cleaning nozzle is washed away from the inner peripheral surface of the granular material supply port by the washing water and sucked into the jet stream, thereby preventing the adhesion and deposition.

A fluid supply means for forming a powdered material storage tank in a bottomed cylindrical shape, forming an upper opening portion for a powdered material inlet, and supplying a pressurized fluid for powdered material outflow to the bottom portion; In the apparatus provided with the above, all of the powder in the powder storage tank is supplied from the powder outlet to the powder supply port by the pressurized fluid supplied from the fluid supply means.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the powder kneading apparatus of the present invention will be described below with reference to the drawings. <Example 1> A powder and particle kneading device 1 according to this example forms cement milk, and as shown in FIG.
2, a pressurizing pump 4 for sucking and pressurizing the water 2 at the bottom of the storing tank 3, and a negative pressure is formed by injecting a high-pressure fluid pressurized by the pressurizing pump 4. Jet pump M. J. P and a jet pump M. J. P
And a powder / particle storage tank 8 for supplying cement (powder / particle) 7 to the powder / particle supply port 6.

The jet pump M. J. P injects the high-pressure water pressurized by the pressurizing pump 4 from the small-diameter injection nozzle 9 into the protection tube 10 formed with a larger diameter than the injection nozzle 9, and the protection tube 10 on the side of the injection nozzle 9. The outside air is sucked from the suction pipe 11 by the negative pressure formed in the above, mixed with the high-pressure jet stream to form a mixed jet stream, and this mixed jet stream is injected into the suction pipe 12 having a larger diameter than the protection pipe 10. Yes formed so as to form a negative pressure caused by the suction tube 12 is a protective tube
Between the suction pipe 12 and the suction pipe 12, there is formed a powder suction unit 13 for sucking the powder and granules with the negative pressure formed in the suction pipe 12 (see FIG. 2). After the powder is sufficiently mixed in the mixing pipe 14 provided on the downstream side,
It is configured to return to the storage tank 3.

As shown in FIG. 2, the powder / granule suction unit 13 includes a protective tube 10 and a suction tube 12 on the left and right side walls of a bowl-shaped container body 16 having an upper end opening as a powder / particle supply port 15.
And mixing tube 14 is supported concentrically, which has formed between the protective tube 10 and the suction pipe 12, powder or granular material supply port 15
Guide part 1 is curled inward and downward
5a is formed. A cleaning nozzle 17 is provided on the bottom surface of the container body 16.
As shown in FIGS. 2 and 3, a portion of the small-diameter dome-shaped casing 18 protruding from the bottom portion of the container body 16 near the upper end thereof is orthogonal to the jet flow injected from the protective tube 10 to the suction tube 12. Orifice 19 for injecting wash water in the direction
19 is formed, and a cleaning water supply path 21 branched from a high-pressure water supply path 20 connecting the pressurizing pump 4 and the injection nozzle 9 is connected to the injection ports 19 (see FIG. 1 ) .
See) .

As shown in FIG. 1, the high-pressure water supply passage 20 is provided with a pressure gauge 22 for detecting the pressure of the high-pressure water and detecting the mixing ratio of the cement 7 and water. . Jet pump M. J. As shown in FIG. 2, the protective tube 10 of P is a support tube 2 having substantially the same diameter as the mixing tube 14 having a mounting flange 23 on the side wall portion of the container body 16 of the powder particle suction port 13.
The mounting flange 23 has a mounting flange 25 provided in the middle of the suction pipe 12 and a flange 26 of the mixing pipe 14 fixedly supported by bolts 27. When such a support structure is used, when the suction tube 12 and the mixing tube 14 are worn out, they can be easily replaced simply by unscrewing the bolt 27.

The jet pump M. J. A powder storage tank 8 for supplying cement (powder) 7 to the powder supply port 6 of P is provided with a tank body 28 having a relatively large bottomed cylindrical shape as shown in FIG. At the upper end, a powder material inlet 29 having a funnel-shaped slope is formed, and at the center of the bottom, a powder material outlet 30 having a lower end opening above the powder material supply port 15 is provided. An interval S between the lower end 30a of the granular material outlet 30 and the granular material supply port 15 (see FIG. 2)
Are formed.

At the bottom of the tank body 28, a permeable supporting plate 31 such as punched metal is attached. On the upper surface of the supporting plate 31, a flexible fine-grained net 32 is provided. A fluid supply means 34 configured to supply outflow air from a blower 33 is formed below the support plate 31 and at the bottom of the tank body 28. In FIG. 1, reference numeral 35 denotes a flow rate control valve for controlling the amount of cement 7 flowing out from the granular material outlet 30, and reference numeral 36 designates a flexible container (e.g., a cement container) installed in the granular material inlet 29. Flexible transport container),
Reference numeral 37 denotes a direction switching valve provided at the discharge port of the pressurizing pump. It is for taking out.

The powder and granule kneading apparatus 1 configured as described above
The operation of will be described below. First, pressurized water 2 in the reservoir 3 with a pressure pump 4, the water in the high pressure, high pressure water supply passage 20
To the injection nozzle 9 through the nozzle, and is injected from the injection nozzle 9 into the protection tube 10 to form a negative pressure in the protection tube 10. The outside air is sucked from the intake pipe 11 by the negative pressure formed in the protection pipe 10 in this manner, and a mixed jet stream is formed in the protection pipe 10. The mixed jet stream is jetted from the protection pipe 10 to the suction pipe 12. When a negative pressure is formed in the suction pipe 12, the negative pressure acts on the granular material supply port 15 from the granular material suction port 13, and the external air is sucked from the granular material supply port 15.

On the other hand, the flexible container 36 is installed so as to close the powder material inlet 29 of the powder material storage tank 8,
In a state where the cement 7 is supplied and deposited on the net 32 of the tank body 28, a blower 33 is provided on the bottom of the tank body 28.
Is supplied to the net 32 through the support plate 31 and the net 3
2 is swelled upward, and furthermore, the cement 7 is loosened with the outflow air that has passed through the net 32, and is metered by the flow rate control valve 35, and falls from the granular material outlet 30 to the granular material supply port 15 opened below. Supply. At this time, the droplets of the jet stream running in the portion of the granular material supply port 15 facing the granular material outlet 30 are pushed into the granular material supply port 15 by the sucked outside air, and the granular material outlet It does not adhere to 30. Further, since there is a gap S between the granular material outlet 30 and the granular material supply port 15, even if the cement 7 supplied from the granular material outlet 30 tries to scatter around, the granular material supply All the powder is sucked into the container body 16 from the powder supply port 15 without being scattered to the surroundings by the suction action of the outside air acting on the port 15, and comes into contact with the jet stream in the suction pipe 12 and the mixing pipe 14, After the milk is formed, the milk is returned to the storage tank 3.

Next, the container body 16 is inserted through the powder supply port 15.
Most of the cement 7 sucked into the inside is sucked into the suction pipe 12, but a part of the cement 7 may adhere to the inner peripheral surface of the container body 16. In such a case, the pressure pump 4
The high-pressure water supplied from the cleaning water supply path 21 branched from the high-pressure water supply path 20 connecting the nozzle and the injection nozzle 9 is injected from the injection port 19 of the cleaning nozzle 17 provided at the bottom of the container body 16. Then, the cement adhering to the inner peripheral surface of the container main body 16 is washed, and guided to the granular material suction port 13 by the guide portion 15a curled downward inside the peripheral portion of the granular material supply port 15 and guided to the suction pipe 12. Because of the suction, adhesion and deposition are prevented.

The cement milk discharged from the mixing pipe 14 is returned to the storage tank 3 and pressurized again by the pressurizing pump 4 to be circulated, so that the mixing ratio of the cement 7 and the water 2 is changed and the viscosity is changed. And the pressure in the high-pressure water supply path 20 connecting the pressurizing pump 4 and the injection nozzle 9 increases. By detecting the increase in the pressure in the high-pressure water supply path 20 with the pressure gauge 22, the mixing ratio of the cement 7 and the water 2 can be accurately detected.

<Embodiment 2> In this embodiment, the jet pump M.P. J. P
Jets high-pressure water pressurized by the pressurizing pump 4 from the small-diameter jet nozzle 9 into the protection tube 10, sucks outside air from the intake pipe 11 with the negative pressure formed in the protection tube 10, and mixes air. The suction pump 12 forms a negative pressure in the suction pipe 12 by injecting the mixed jet stream from the protection pipe 10 to the suction pipe 12.
J. The point that P is configured as shown in FIG. 4 is different from the first embodiment.

That is, the jet pump M. J.
P denotes a jet nozzle 9 and a suction pipe 12 concentrically attached to a container body 16 of a powdery material supply port 15.
The internal water 2 is pressurized by a pressurizing pump 4, and this high-pressure water is directly injected from an injection nozzle 9 into a suction pipe 12, and external air and air are supplied from a granular material supply port 15 by a negative pressure formed in the suction pipe 12. The cement 7 flowing down from the powder outlet 30 is sucked into the container body 16. In this case, the suction tube 12 can also serve as the mixing tube 14.

<Embodiment 3> In this embodiment, the granular material storage tank 8 of each of the above embodiments is shown in FIG.
The other configuration and operation are the same as those in the first embodiment. The granular material storage tank 8 of the present embodiment is formed in a tapered shape with a relatively large diameter and a lower taper.
At the lower end, a screw-type transport shaft 39 that is driven to rotate by a motor 38 is provided, and at the motor-side end of the screw-type transport shaft 39, the powder material outlet 30 is formed. In Example 1, the supporting plate 31 having air permeability such as punching metal, the fine net 32 having flexibility, the air blower 35 and the flow rate control valve of the fluid supply means 34 in Example 1 can be omitted, and the screw type transport shaft 39 can be omitted. If the powder material outlet 30 is provided obliquely so as to be located above, the powder material storage tank 8
There is also an advantage that the upper end position of the device can be lowered and the whole device can be compactly assembled.

In each of the above embodiments, a pressure gauge 22 is provided in the high-pressure water supply passage 20 connecting the pressure pump 4 and the injection nozzle 9, and the pressure gauge 22 is used to accurately determine the mixing ratio between the cement 7 and the water 2. When the pressure sensor detects a predetermined pressure, the kneading device 1 is automatically stopped or the direction provided at the discharge port of the pressurizing pump 4 is detected. Needless to say, the switching valve 37 may be switched to take out from the discharge pipe 38 by using the discharge pressure of the pressure pump 4. In the above embodiment, cement and water are kneaded, but it goes without saying that it can be used for kneading other powders, for example, pulverized coal.

[0028]

As described above, the powder and granule kneading apparatus according to the present invention uses a high-pressure fluid pressurized by a pressure pump.
Injects into the protection tube to form a negative pressure here, and suction with this negative pressure
Mixed air into the jet stream in the protective tube
A jet stream is formed, and this mixed jet stream flows through the mixing pipe.
Is, with forming a large and powerful negative pressure into the mixing tube, the outside air from the atmosphere communicating with the portion of the periphery of the granular material supply port facing the granular material outlet port in the negative pressure from the granular material outlet port It sucked with the supplied granular material, mixed in the mixing tube in the jet pump
Since granular material care jet stream and the ambient air are to ensure that stirring and mixing, mixing of fly inside the granule feed port
Water droplets of the air jet flow enter the granular material storage tank from the granular material outlet, and the fine particles such as pulverized coal in the granular material storage tank.
There is an advantage that the conventional problem of moistening and hardening of the body can be prevented beforehand. Especially, even when kneading fine powder that reacts with water like cement powder,
There is an advantage that the cement can be satisfactorily supplied without reacting and solidifying in the powder outlet or the powder storage tank.

Further, in the apparatus in which the mixing ratio between the liquid and the granular material is detected by a pressure change of a high-pressure fluid supplied from a pressurizing pump for pressurizing the liquid to a jet nozzle of the jet pump, When the kneaded liquid is returned to the pressurizing pump and circulated again, the viscosity increases as the kneading ratio of the powder increases, and the liquid is supplied to the jet nozzle of the jet pump from the pressurizing pump that pressurizes the liquid. Since the pressure of the high-pressure fluid gradually rises, the change in the rising pressure makes it possible to easily and accurately detect the mixing ratio between the liquid and the granular material, without depending on the feeling. There is also an advantage that a stable mixture of a homogeneous liquid and a granular material can be formed.

In this case, the kneading ratio can be detected by a change in pressure, so that it is not necessary to stop the operation of the powder and particle kneading apparatus, and the kneading ratio can be easily detected without any trouble. There is also an advantage that the moving efficiency can be improved.

Further, in the case where a cleaning nozzle for injecting a cleaning liquid is provided on the lower surface of the bowl-shaped granular material supply port having an upper opening, the granular material supplied from the granular material outlet is used for the granular material. The washing water sprayed from the cleaning nozzle flushes the inner peripheral surface of the body supply port and tries to suck it into the jet stream. Can be reliably prevented from deteriorating,
There is also an advantage that the effective utilization rate of the granular material can be increased.

In addition, in the case where the fluid supply means for supplying the pressurized fluid for powder outflow is provided at the bottom of the bottomed cylindrical powder and particulate storage tank, the powdery fluid is supplied by the fluid supply means. The granular material in the body storage tank can be entirely supplied from the granular material outlet to the granular material supply port, and there is also an advantage that the residual granular material can be eliminated and the effective utilization rate can be further increased. .

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view illustrating a schematic configuration of a powder and particle kneading apparatus according to a first embodiment.

2 shows a jet pump M.E. J. It is a longitudinal cross-sectional view of P part.

FIG. 3 is a cross-sectional plan view of the container main body portion of the powder material supply port according to the first embodiment.

4 shows a jet pump M.E. J. It is a longitudinal cross-sectional view of P part.

FIG. 5 is a vertical sectional view of a granular material storage tank according to a third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Granular material kneading apparatus 2 ... Liquid (water) 4 ... Pressurizing pump 7 ... Granular material 8 ... Granular material storage tank 9 ... Injection nozzle 10 ... Protective tube 12 ... Suction tube 14 ... Mixing tube 15 ... Powder supply port 17 ... Cleaning nozzle J. P ・ ・ ・ Jet pump

Claims (4)

(57) [Claims] 1. A pressure pump for pressurizing a liquid, and a pressure pump.
A jet pump for injecting the high-pressure liquid pressurized by the step to form a negative pressure, and a powder storage tank for storing the powder, and the jet pump keeps the pressurized fluid from the injection nozzle.
Injects into the protection tube and sucks outside air with the negative pressure formed in the protection tube
To mix with the jet stream in the protective tube to
And jets the mixed jet stream into the suction pipe or mixing pipe
To create a negative pressure in the suction or mixing tube
Composed of an air-mixing jet pump, the powder / particle outlet of the powder storage tank faces the powder / particle supply port of the jet pump, and the powder / particle supply port facing the powder / particle outlet connects to the atmosphere. Powder kneading apparatus. 2. The method according to claim 1, wherein a mixing ratio of the liquid and the powder is detected by a pressure change of a high-pressure fluid supplied from a pressurizing pump for pressurizing the liquid to a jet nozzle of the jet pump. Item 2. A powder and particle kneading apparatus according to Item 1. 3. The cleaning device according to claim 1, wherein the powder supply port is formed in a bowl shape having an upper opening, and a cleaning nozzle for jetting a cleaning liquid is provided on a lower surface. Powder kneading device. The 4. A granular material reservoir tank is formed in a bottomed cylindrical shape, to form a granular material inlet to the upper opening, a fluid supply means for supplying a granular material outflow pressurized fluid to the bottom The powder kneading device according to any one of claims 1 to 3, further comprising: