JPH0335219B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an apparatus for continuously discharging powder in a hopper in predetermined amounts together with high pressure gas.

(Prior Art) As one of the grouting methods for improving soft ground, there is a method in which a pipe is placed in a hole drilled in the ground, and a powdered grouting agent is blown into the pipe together with a high-pressure gas such as compressed air. In such a grouting method, it is desirable to continuously supply a fixed amount of powdered grouting agent to the pipe together with high pressure gas.

One device that continuously discharges powder includes a hopper that stores the powder, an agitator that is installed in the hopper and that stirs the powder in the hopper, and a device that continuously discharges the powder in the hopper. There is a device equipped with a discharge machine using a screw conveyor that sends out the
51-22286).

However, since this powder discharge device is a device that continuously discharges the powder in the hopper under atmospheric pressure,
When applied to a device that ejects powder in a hopper together with high-pressure gas, the high-pressure gas flows back into the hopper, making it impossible to continuously discharge a fixed amount of powder together with the high-pressure gas.

As one of the devices for discharging powder and granular material into the pressure chamber,
There is a device equipped with a discharge machine using a screw conveyor that sends powder and granular material from its supply port to a pressure chamber, and a valve that opens and closes the powder outlet of the discharge machine (Jikkosho
55-11862).

However, in this device, the actual pressure gas in the pressure chamber flows back to the powder supply port, so in order to prevent this, the screw conveyor is moved forward and backward to consolidate the powder and the powder exit. must be opened and closed, and therefore it is not possible to continuously discharge a fixed amount of powder and granular material together with high-pressure gas.

(Objective of the Invention) An object of the present invention is to provide a powder discharge device that can continuously discharge a fixed amount of powder together with high-pressure gas.

(Structure of the Invention) The powder discharge device of the present invention includes: a powder storage hopper having a powder input port and a powder discharge port; a nozzle provided in the hopper for supplying high pressure gas into the hopper; an agitator disposed in the hopper to agitate the powder in the hopper; an ejector disposed at the discharge port of the hopper to continuously send out the powder in the hopper; and a powder outlet of the ejector. placed in
and a valve mechanism that adjusts the amount of powder discharged.

The valve mechanism includes a nozzle portion that jets high-pressure gas supplied from the second nozzle toward the outlet in order to blow away the received powder toward the outlet.

(Operations and Effects of the Invention) The inside of the hopper is maintained at a predetermined pressure higher than atmospheric pressure. The powder is agitated within the hopper by a stirrer, and thereby is maintained so as not to be compacted within the hopper even if the pressure inside the hopper is maintained at high pressure.
Therefore, the powder in the hopper is continuously sent out in a predetermined amount to the valve mechanism from the powder outlet by the discharger.

The powder sent to the valve mechanism is ejected from the outlet together with high pressure gas ejected from the nozzle portion of the valve mechanism. The high pressure gas within the valve mechanism is prevented from flowing back into the hopper by maintaining the pressure within the hopper at a predetermined pressure.

According to the present invention, the valve mechanism blows the received powder toward the powder outlet.
Since the hopper has a nozzle part that spouts high-pressure gas supplied from the nozzle toward the powder outlet, the hopper is provided with a nozzle that supplies high-pressure gas, and the powder in the hopper is not consolidated. Powder can be continuously discharged in fixed amounts along with high-pressure gas.

(Example) The embodiments shown in the drawings will be described below.

Powder discharge device 10 shown in FIGS. 1 and 2
A hopper 12 that stores powder and a nozzle 14 that supplies high-pressure gas such as compressed air into the hopper.
and a stirrer 16 that stirs the powder in the hopper 12.
, a discharger 18 that continuously discharges powder from the hopper 12, and a valve mechanism 20 that adjusts the amount of powder discharged by the discharger, and a plurality of support mechanisms 22.
It is supported by a support stand 24 via.

As shown in FIG. 2, the hopper 12 includes a funnel-shaped hopper main body 26 and a cover 28 that closes the upper opening of the main body.

The hopper main body 26 is supported by the support stand 24 via the support mechanism 22 so that the top of the conical shape faces downward. At the lower end of the hopper main body 26, as shown in FIG.
2 is formed.

As shown in FIG. 2, a cylindrical body 36 defining a powder inlet 34 is welded to the cover 28. As shown in FIG. The input port 34 is closed by a lid 40 that is removably attached to the cylindrical body 36 with bolts 38.

The hopper main body 26 has a flange 42 at its upper end, and the cover 28 has a flange 44 at its lower end. The cover 28 is removably attached to the hopper main body 26 by bolts 46 at the flange 44, with its flange 44 overlapping the flange 42 of the hopper main body 26.

Nozzle 14 is attached to hopper body 26 and is connected to a high pressure gas source (not shown), such as a compressor. In the illustrated example, the nozzle 14 is attached to the upper part of the hopper main body 26, but it may be attached to the lower part of the hopper main body 26.

The stirrer 16 includes a rotating shaft 48 that crosses the hopper main body 26, a blade 50 provided on the rotating shaft, and a motor 52 that rotates the rotating shaft 48.

The rotating shaft 48 is rotatably supported by a pair of support frames 54 and 56 attached to the hopper main body 26, and extends in the horizontal direction at a distance from the central axis OP of the hopper main body 26.

When the rotating shaft 48 is rotated by the motor 52, the blades 50 are rotated in a plane perpendicular to the rotating shaft 48, thereby stirring the powder in the hopper main body 26.

The motor 52 is a hydraulic motor, and the support frame 54
is attached to. However, the motor 52
It may be a pneumatic motor or an electric motor.

The discharger 18 includes a cylinder 58 attached to the cylinder part 32 of the hopper main body 26, and a cylinder 58 and the hopper 1.
A rotating shaft 60 extending vertically inside the rotating shaft, and a blade 62 spirally attached to the outer periphery of the lower end of the rotating shaft.
, a support 64 that rotatably supports the upper part of the rotation shaft 60 with respect to the cover 28 , and a hydraulic motor 66 that is supported by the support and rotates the rotation shaft 60 . The powder is sent downward. Motor 66 may also be a pneumatic or electric motor.

The upper part of the cylinder 58 has a cylindrical shape having the same inner diameter as the cylinder part 32 of the hopper main body 26, and the lower part has a conical shape. The cylindrical body 58 is aligned with the central axis of the hopper main body 26.
It is located along the OP.

The rotating shaft 60 extends along the central axis OP of the hopper main body 26 so as not to overlap the rotating shaft 48 of the stirrer 16.

As shown in FIG. 3, the blades 62 are provided extending from the cylindrical body 58 to the cylindrical portion 32 of the hopper main body 26. The cylindrical body 58 is fixed to the cylindrical portion 32 with a plurality of bolts 68.

As shown in FIG. 3, the valve mechanism 20 includes a funnel-shaped connecting portion 70 that receives powder and high-pressure gas.
, a guide portion 72 that continues to the lower end of the connecting portion, a support tube 74 welded to the guide portion, and a support tube that passes through the support tube in the vertical direction to open and close the powder outlet of the tube portion 58 of the ejector 18. A valve stem 76 is provided.

As shown in FIG. 3, the connecting portion 70 is attached to the cylindrical body 58 of the ejector 18 with a plurality of bolts 78. The guide portion 72 is welded to the lower end of the connecting portion 70, and extends obliquely downward from the lower end of the connecting portion 70, and then extends horizontally. The support tube 74 extends downward along an extension of the central axis OP and has a screw hole into which the valve stem 76 is screwed.

The valve stem 76 has a conical valve 80 at its upper end and a handle 82 at its lower end. Valve 8
0 faces the lower opening of the cylindrical body 58 of the ejector 18, that is, the powder outlet 84 from the ejector 18, and opens and closes the powder outlet 84. Therefore, the lower end of the cylindrical body 58 has the function of a valve seat against which the valve 80 comes into contact.

A pipe 86 is connected to the guide portion 72 by a plurality of bolts 88, which is connected to an ejection pipe in a hole drilled in the ground at the work site. A nozzle 90 that supplies high-pressure gas such as compressed air to the pipe 86 through the valve mechanism 20 is attached to the connecting portion 70 .

The valve mechanism 20 opens and closes the powder outlet 84 by the valve 80 when the handle 82 is rotated and the valve rod 76 is rotated relative to the support cylinder 74 and moved in the vertical direction. The amount of powder discharged from the discharger 18 can be adjusted by changing the position of the valve 80 relative to the powder outlet 84.

The lower part of the cylindrical body 58 of the ejector 18 is inserted into the connecting portion 70 . Therefore, the connecting portion 70 allows the high pressure gas supplied from the nozzle 90 to be transferred to the guide portion 72.
A jet nozzle portion for ejecting powder is formed around the powder outlet 84 of the ejector 18 in cooperation with the lower part of the cylinder 58. The tip of the guide portion 72 defines an outlet through which the powder flows out into the pipe 86 together with the high pressure gas.

In operation of apparatus 10, motors 52 and 66 are rotated and high pressure gas is supplied to hopper 12 and valve mechanism 20 through nozzles 14 and 90, respectively.

Since the blades 50 are rotated as the motor 52 rotates, the powder in the hopper 12 is agitated by the blades 50. As a result, the powder is suspended in the hopper and is not consolidated, so there is no need to maintain a constant amount of powder remaining in the hopper 12.

Since the blades 62 are rotated as the motor 66 rotates, the powder in the hopper 12 is sent out to the valve mechanism 20 by the blades 62.

The pressure within the valve mechanism 20 is increased by the high pressure gas supplied from the nozzle 90. However, since high pressure gas is supplied from the nozzle 14 to the hopper 12, the pressure in the hopper 12 and the pressure in the valve mechanism 20 are balanced, so the high pressure gas in the valve mechanism 20 does not flow back to the hopper 12. .

The high-pressure gas supplied from the nozzle 90 to the valve mechanism 20 is ejected from the jet nozzle section between the cylinder 58 and the connecting section 70 toward the guide section 72, and the powder falling from the powder outlet 84 is directed toward the guide section. 7
Blow it towards 2.

As a result, the powder along with the high-pressure gas is transferred from the tip opening of the guide section 72, that is, the outlet, to the pipe 86.
It is squirted to As a result, the powder is supplied to the grouting pipe without remaining in the guide portion 72 and the pipe 96, and the high pressure gas in the valve mechanism 20 is prevented from flowing back to the hopper 12.

As shown in FIG. 4, the support mechanism 22 includes a pedestal 94 attached by bolts to a support column 92 extending upward from the support base 24, a guide 96 extending upward from the tip of the arm, and a support column 92 extending upward from the support base 24. A slider 98 fitted to the outside of the guide so as to be movable up and down
, a compression coil spring 100 disposed between the slider and the guide 96 and pushing the slider 98 upward with respect to the guide 96, and the guide 96 and the slider 9.
8 and a shaft 102 that passes through the guide 9 in a vertically movable manner.
6 and the slider 98.
04.

The slider 98 is attached to the hopper main body 26 via a horizontally extending attachment arm 106. The slider 98 also includes a connecting portion 108 at its upper portion, and the connecting portion is connected to a lower portion of a tension type load detector 110, and an upper portion of the load detector is connected to a support arm 112 attached to the support column 92. has been done. A nut 114 is threaded onto the upper and lower ends of the shaft 102 and prevents the slider 98 from coming off the guide 96.

As shown in FIG. 1, two support pillars 92 located on the side of the powder input port 34 for the powder into the hopper 12 are used for inputting the powder from the input port 34 to the hopper 12, and the device 1.
Workbench 11 for maintenance, inspection, etc. of 0
6 is attached, and a ladder 11 is attached to the workbench.
8 and a handrail 120 are provided.

The entire load of the powder discharge device 10, excluding the support mechanism, acts on the support mechanism 22 via the mounting arm 106 and onto the slider 98. As a result, the slider 98 is lowered against the force of the spring 100.
The load value is detected as an electrical signal by the load detector 110. The detection signal from the load detector 110 is used to calculate the amount of powder used. The amount of powder used is the amount by which the total load is reduced by the load detector 110.

The powder discharge device 150 shown in FIGS. 5 to 7 is
A nozzle 14 for supplying high pressure gas into the hopper 12 is attached to the lower part of the hopper main body 26, a vertical stirrer 152 is arranged in the hopper 12, a horizontal discharger 154 is provided at the lower part of the hopper, and a horizontal discharger 154 is provided at the lower part of the discharger. A valve mechanism 156 is provided.

The hopper 12 includes a hopper main body 26 and a cover 28.
The cover 28 includes a cylindrical body 36 defining an input port 34. The hopper 12 is supported by a support column 92 via a flange 158 with reinforcing ribs of the hopper main body 26, a plurality of load detectors 110, and frames 94 of a plurality of support mechanisms 22.

As shown in FIG. 6, the stirrer 152 includes a rotating shaft 160 extending substantially vertically within the hopper 12;
It includes a plurality of blades 162 provided on the rotating shaft and a motor 164 that rotates the rotating shaft 160.

The rotating shaft 160 is rotatably supported by a support arm 166 attached to the hopper main body 26 and a support stand 168 attached to the cover 28, and is rotated in a substantially perpendicular direction at a distance from the central axis OP of the hopper main body 26. It is growing to.

The motor 164 is a hydraulic motor, and the motor 164 is a hydraulic motor.
It is attached to 68. But motor 164
may be a pneumatic motor or an electric motor.

A plurality of blades 162 are attached to a plurality of positions at intervals in the longitudinal direction of the rotating shaft 160, and when the rotating shaft 160 is rotated by a motor 164, the blades 162 are rotated in a plane slightly inclined with respect to the horizontal plane. The powder in the hopper main body 26 is stirred.

The ejector 154 includes a cylindrical body 170 attached to the cylindrical portion 32 of the hopper main body 26, a rotating shaft 172 extending horizontally within the cylindrical body, and a blade 174 spirally attached to the outer periphery of the rotating shaft. Rotating shaft 17
This screw conveyor is equipped with a support body 176 that rotatably supports powder powder in the hopper 12 relative to a cylinder 170, and a hydraulic motor 178 that is supported by the support body and rotates a rotating shaft 172. Send in the direction. Motor 178 may also be a pneumatic or electric motor.

The cylindrical body 170 has a receiving portion 180 connected to the cylindrical portion 32 of the hopper main body 26, and is fixed to the cylindrical portion 32 at the receiving portion with a plurality of bolts 68.

As shown in FIG. 7, the valve mechanism 156 includes a funnel-shaped connecting portion 1 that receives powder and high-pressure gas.
82 and a guide portion 184 continuing to the lower end of the connecting portion.
, a valve seat portion 186 that follows the guide portion, and a valve rod 188 that is screwed into the guide portion 184.

As shown in FIG. 7, the connecting portion 182 is attached to the cylindrical body 170 of the ejector 154 with a plurality of bolts 190. The guide portion 184 has a space following the connecting portion 182 and the valve seat portion 186, and a space adjacent to the valve stem 1.
88 is screwed into the screw hole extending in the horizontal direction.

A pipe 190 is connected to the valve seat portion 186 and extends to a spout pipe in a hole drilled in the ground at the work site. The tip of the valve seat portion 186 defines an outlet through which the powder flows out into the pipe 86 together with the high pressure gas.

The valve stem 188 has a hole 192 penetrating in the direction of its central axis, and is equipped with a conical valve 194 at its tip that opens and closes the opening of the valve seat 186, and is threaded into the threaded hole of the guide section 184. It has a mating male threaded part on the outer circumferential surface of the central part, and the valve stem 188 is connected to the guide part 1.
A handle 196 for rotation with respect to 84 is provided at the rear.

In the valve mechanism 156, when the handle 196 is rotated, the valve stem 188 is rotated relative to the guide portion 184 and moved in the horizontal direction, so that the valve 194 is rotated.
to open and close the opening of the valve seat portion 186. Further, the amount of powder discharged from the discharger 154 can be adjusted by changing the position of the valve 194 with respect to the valve seat 186.

A nozzle 198 is attached to the rear end of the valve stem 188 for supplying high pressure gas such as compressed air to the pipe 86 through the valve mechanism 156. hole 19
2 opens at the tip of the valve 194. valve 194
defines a nozzle portion that jets the high-pressure gas supplied to the hole 192 from the tip of the valve 194 toward the opening of the valve seat 186.

In operation of apparatus 150, motors 164 and 178 are rotated and high pressure gas is supplied to hopper 12 and valve mechanism 156 through nozzles 14 and 198, respectively.

Since the blades 162 are rotated as the motor 164 rotates, the powder in the hopper 12 is transferred to the blades 16.
Stirred by 2. As a result, the powder is suspended in the hopper and is not consolidated, so that there is no need to maintain a constant amount of powder remaining in the hopper 12.

Since the blades 174 are rotated as the motor 178 rotates, the powder in the hopper 12 is transferred to the blades 17.
4 to the valve mechanism 156.

The pressure in the valve mechanism 156 is increased by the high pressure gas supplied from the nozzle 198. However, since the powder is forced out by the screw conveyor, the high pressure gas within the valve mechanism 156 does not flow back to the hopper 12. In addition, since high pressure gas is supplied to the hopper 12 from the nozzle 14, the hopper 12
2 and the pressure in the valve mechanism 156 are balanced, thus ensuring that the high pressure gas in the valve mechanism 156 is prevented from flowing back into the hopper 12.

The high pressure gas supplied from the nozzle 198 to the valve mechanism 156 is ejected from the tip of the valve 194 into the opening of the valve seat 186 and blows the powder falling from the powder outlet 84 into the valve seat 186.

As a result, the powder is transferred to the valve seat 1 along with the high pressure gas.
Pipe 190 from the tip opening or outlet of 86
It is squirted to As a result, the powder is supplied to the grouting pipe without remaining in the valve seat 186 and the pipe 190, and the high pressure gas in the valve mechanism 156 is prevented from flowing back into the hopper 12.

[Brief explanation of drawings]

Fig. 1 is a plan view showing one embodiment of the powder discharging device of the present invention, Fig. 2 is a sectional view taken along the line - in Fig. 1, and Fig. 3 is a discharging of the powder discharging device. 4 is an enlarged sectional view showing the support mechanism; FIG. 5 is a plan view showing another embodiment of the powder discharge device of the present invention; FIG.
The figure is a cross-sectional view taken along the - line in Figure 5.
The figure is an enlarged sectional view showing the valve mechanism. 12: Hopper, 14,90,198: Nozzle,
16,152: Stirrer, 18,154: Discharger,
20,156: Valve mechanism, 30: Discharge port, 3
4: Inlet, 48, 160: Rotating shaft, 50, 16
2: Blade, 60, 172: Rotating shaft, 62, 17
4: Blade, 52, 66, 164, 178: Motor, 70, 182: Connection section, 72: Guide section, 8
0: Valve, 84, 194: Powder outlet, 196: Valve seat.

Claims (1)

[Scope of Claims] 1. A powder storage hopper having a powder inlet and an outlet, a first nozzle provided in the hopper and supplying high-pressure gas into the hopper, and a first nozzle disposed in the hopper for supplying high-pressure gas into the hopper. , a stirrer for stirring the powder in the hopper; a discharger disposed at the discharge port of the hopper to continuously feed out the powder in the hopper; a valve mechanism arranged to receive the powder and adjust the discharge amount of the powder; and a second nozzle for supplying high pressure gas to the valve mechanism, the valve mechanism directing the received powder toward an outlet thereof. A powder discharging device comprising a nozzle portion that spouts high-pressure gas supplied from the second nozzle toward the outlet in order to blow the powder away. 2. The valve mechanism receives the high-pressure gas supplied from the second nozzle part, and includes a connecting part that forms the nozzle part around the powder outlet together with a member that defines the powder outlet; The powder discharge device according to claim 1, further comprising a valve for opening and closing the powder outlet. 3. The agitator has a rotating shaft extending substantially vertically within the hopper, a rotation source that rotates the rotating shaft around the axis, and a blade attached to the rotating shaft, and the discharging machine The powder discharge device according to claim 2, wherein is a screw conveyor that sends out the powder from above to below. 4. The valve mechanism includes a connecting portion that receives the powder sent out from the powder outlet, a valve seat portion connected to the connecting portion to receive the powder from the connecting portion, and a valve seat portion that opens and closes an opening of the valve seat portion. 2. A valve according to claim 1, wherein the nozzle portion is formed on the valve to jet the high pressure gas supplied from the first nozzle into the opening of the valve seat portion. The powder discharge device described. 5 The agitator has a rotating shaft extending substantially horizontally within the hopper, a rotation source that rotates the rotating shaft around the axis, and a blade attached to the rotating shaft, and the discharging machine The powder discharge device according to claim 4, wherein is a screw conveyor that sends out the powder in a horizontal direction.