JP2835492B2 - Powder spraying 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 spraying apparatus for spraying a stabilizer on the ground in a soil stabilization method.

[0002]

2. Description of the Related Art In recent years, road construction, foundation work (civil engineering, architecture).
In the construction, a soil stabilization method is used as an improvement work for soft ground. In this construction, a stabilizer such as cement is sprayed on the soft ground that has been leveled, and the stabilizer and the soft ground are mixed and agitated, followed by rolling to strengthen the ground. In the meantime, the step of spraying a stabilizer such as cement described above often depends on human power, resulting in a problem that the working speed is slow and the working environment is deteriorated due to the scattering of the stabilizer. In order to improve this, a spraying apparatus has been developed in which a tank is mounted on a moving vehicle, and a stabilizer such as cement contained in the tank is conveyed by a belt conveyor and sprayed from a spraying section onto the ground.

[0003]

However, in the above-described spraying apparatus, it is difficult to ensure a uniform transport amount because the entire weight of the cement contained in the tank is added to the belt conveyor. Also, there is a problem that the power for driving the belt conveyor increases.
Further, since the width of the cement to be sprayed on the ground is regulated by the width of the belt conveyor, there is a problem that not only the width cannot be adjusted variously but also the amount of spray varies.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to reduce the load applied to a screw blade to reduce the driving power and to reduce the width of a stabilizer such as cement to be sprayed on the ground. Another object of the present invention is to provide a powder spraying apparatus capable of controlling a spraying amount in various ways.

[0005]

According to a first aspect of the present invention, there is provided a powder dispersing device which is mounted on a traveling device and stores a powder of cement, lime or the like, and which is attached to the tank and the powder is pressure-fed. A supply pipe, at least one deaeration device provided on the upper surface of the tank, a discharge cylinder protruding from the tank and having a spray portion at an end , and a discharge cylinder provided at a lower portion of the tank and in the discharge cylinder. A powder dispersing device comprising a plurality of independently operable screw conveyors for conveying the powder from one end of the tank to the other discharge cylinder, wherein each screw conveyor comprises: Multiple types with different pitches
Equipped with screw blades having the same kind of blades, and
The switch is characterized in that it is sequentially set to be larger than the pitch of the blades on the opposite side .

The screw conveyor of the powder dispersing device according to the second aspect of the present invention provides a screw conveyor for a blade near an inlet of a discharge cylinder in a tank.
The feature is that the pitch is set to be larger than the pitch of the blade on the opposite side .

The tank of the powder dispersing device according to a third aspect of the present invention is characterized in that a guide plate for guiding the powder, which is located above the screw conveyor and descends, to the side of the screw blade of the screw conveyor, is provided. Having.

[0008] The spraying portion of the powder spraying apparatus according to the fourth aspect is characterized in that a dispersion plate for receiving falling powder and dispersing the powder in a wide range and evenly is provided.

A degassing device for a powder dispersing device according to a fifth aspect is characterized in that the ventilation area is configured to be expandable and contractable, and separates the powder when extended.

[0010]

According to the first aspect of the present invention, the powder such as cement or lime fed through the supply pipe is stored in the tank. The pressure in the tank becomes equal to the atmospheric pressure through the deaerator. The powder in the tank is conveyed by a plurality of screw conveyors, and is scattered on the ground from a scatter portion of the discharge cylinder portion. If the screw conveyor is operated in a quantity corresponding to the spray width, the spray width of the powder can be appropriately adjusted. The amount of powder conveyed by the screw conveyor is
Increases as root pitch increases. The blades on the sprayer side
Switches are set to be sequentially larger than the pitch of the blades on the opposite side.
Powder is consumed from all areas of the tank.

The screw blade of the screw conveyor of the powder dispersing device according to the second aspect of the present invention is provided with a discharge cylinder portion in the tank.
The pitch of the blade near the inlet is smaller than the pitch of the blade on the opposite side.
Since the setting is large, the powder in the tank is uniformly discharged. Then, the center of gravity of the tank containing the powder gradually descends, and stable traveling by the traveling device can be performed. Also,
The powder on the outlet side is not clogged.

According to the third aspect of the present invention, the tank of the powder dispersing apparatus is provided with a guide plate which is located above the screw conveyor and guides the descending powder to the side of the screw blade of the screw conveyor. The density is kept uniform without being compressed and the cement is not loaded on top of the screw blade, and the screw blade does not bend due to the weight of the cement.

According to the fourth aspect of the present invention, since the dispersion plate receives the falling powder and disperses the powder, the powder is spread over the ground over a wide area and in a uniform thickness. You.

According to a fifth aspect of the present invention, the degassing device of the powder dispersing device is configured so that the ventilation area can be expanded and contracted, and separates the powder when it is extended, so that the powder is not scattered around the device.

[0015]

An embodiment of the present invention will be described below with reference to the drawings. First, in FIG. 1 to FIG.
Has a rubber crawler, and a tank 2 is mounted on the traveling device 1. The tank 2 has a cubic shape, and lower portions of the front and rear sides (left and right shown in FIG. 1) have an inclined shape that is reduced toward the bottom. A hatch 3 is provided at the center of the upper surface of the tank 2, and six exhaust ports 4 are provided at left and right ends. In addition, a viewing window 5 provided with a pressure-resistant glass through which the inside can be seen is provided on a side surface portion in the longitudinal direction. The exhaust port 4 has a total of 12
Although at least one is provided, it is sufficient that at least one is formed.

A supply pipe 6 is provided on one side (left side in FIG. 1) of the tank 2 for feeding powder such as cement or lime as a ground stabilizer. An inclined plate 7 is attached to the inside of the tank 2 at a position corresponding to the supply pipe 6. As a result, the powder of cement, lime or the like sent out from the supply pipe 6 hits the inclined plate 7 and is guided downward of the tank 2.

At the lower part of the tank 2, as shown in FIG.
A plurality of, for example, six casings 11 are formed.
Each of these casings 11 has a semicircular lower part and an inclined upper part that opens upward. Further, a discharge cylinder portion 12 protruding from the tank 2 is formed at a position where the center line of the semicircular portion of each of the casings 11 is extended. Bearings are attached to one side surface of the tank 2 and an end surface of the discharge cylinder 12, and the screw blades 13 supported by these bearings form a semicircular portion of the casing 11 and the center of the discharge cylinder 12. It is arranged to be rotatable.

As shown in FIG. 4, the screw blades 13 are provided with blades having different pitches. The pitch p1 of the blades 13a located in the tank 2 is small. The pitch p2 of the blades 13b near the inlet 12a is set large (p1 <p2). Here, the pitch refers to a distance between two consecutive vertexes of the blades 13a and 13b. Further, the blade 13b is connected to the screw blade 13 by 180.
It is composed of two blades having a pitch p2 provided at intervals of degrees. The screw conveyor 14 includes the casing 11, the discharge cylinder 12, and the screw blade 1.
3.

Then, between the discharge cylinder portion 12 and the blade 13b.
The gap is formed uniformly , and a fixed amount of powder according to the number of rotations is conveyed in the discharge cylinder 12 by the screw blade 13. The blade 13b is not limited to two blades, but may be configured by three or more blades. Also, the inlet 1 of the discharge cylinder 12
Above 2a (joining portion with the tank 2), an inclined introduction portion 12b is formed, and powder in the tank 2 is introduced into the inlet 1a.
2a.

The end of each screw blade 13 protrudes outward from the discharge cylinder 12 and, as shown in FIG.
Two sprockets 15 are rotatably mounted via 5a. A chain 16 is sequentially stretched between the corresponding sprockets 15 of the adjacent screw blades 13. When the hydraulic motor 17 is rotated, the end of each screw blade 13 is moved through the plurality of sprockets 15 and the chain 16. The sprocket 15 is rotated. A clutch 18 is attached to an end of each screw blade 13.
These clutches 18 are composed of a sleeve 19 slidably provided and slidable integrally with the screw blade 13 via a key, and an operation lever 20 for moving the sleeve 19 in the axial direction. I have.

Then, the sleeve 19 is attached to the sprocket 15
When it moves in the direction, the engaging blade 19a on the side surface engages with the engaging blade of the sprocket 15 and the screw blade 13 rotates, and when it moves in the opposite direction, the engaging blade 19a is disengaged and the screw The blades 13 stop. Further, by operating the clutch 18, each screw blade 13 can be driven and stopped independently. The rotation speed of the hydraulic motor 17 is variable, and the rotation speed of the screw blade 13 can be changed by changing the rotation speed.

The guide plate 21 is provided on the tank 2 so as to cover the upper part of the screw blade 13. In the present embodiment, the cross section is formed so as to form a mountain shape protruding upward, but the present invention is not limited to this, and may be formed in a flat plate shape. Spraying part 22
Is vertically attached to an end portion of the discharge tube portion 12 in a rectangular cylindrical shape, and an upper end portion communicates with the discharge tube portion 12. Further, a dispersion plate 23 for closing the lower end is provided rotatably. The dispersing plate 23 is configured such that when the lower end portion of the spraying portion 22 is opened, the inclination angle with respect to the lower end portion can be appropriately set, and receives the powder falling from the spraying portion 22 and spreads it on the ground over a wide area. The discharge cover 24 is provided between the tank 2 and the ground so as to cover the six sprinkling portions 22, and a canvas is attached to a lower end portion.

As shown in FIG. 6, the deaerator 30 is attached to each exhaust port 4 on the upper surface of the tank 2. The deaerator 30 filters the powder of cement or the like pumped together with the compressed air to separate it from the air, and disperses the air to the atmosphere. In this embodiment, the bag is formed in a cylindrical shape with a bottom and an open bottom surface from a nylon fabric, and the opening is attached to the exhaust port 4. The deaerator 30 is normally reduced in size and reduced in height, and is folded so as to be in close contact with the exhaust port 4. When powder such as cement is pumped, the air pressure in the tank 2 increases. As shown by the two-dot chain line, it is elongated in a cylindrical shape to increase the ventilation surface area, and the degassing effect and the cement separation effect are enhanced.

The deaerator is not limited to nylon, but may be cotton,
It may be formed of a non-woven fabric or the like, or may be configured by combining these materials. Further, a sponge made of urethane foam or the like may be attached to the inside of a stretchable bellows-shaped outer cylinder. In short, any material may be used as long as it can pass the air and filter the powder. Further, in the present embodiment, a total of twelve are provided, but it is sufficient if at least one is formed.

Next, the operation of the above configuration will be described.
First, a powder such as cement is supplied into the tank 2. That is, the supply pipe 6 is connected to the storage part of the cement, and is supplied into the tank 2 together with the compressed air. The cement delivered from the supply pipe 6 hits the inclined plate 7, is guided below the tank 2, and is filled in the tank 2. When the cement is supplied together with the compressed air into the tank 2, the deaerator 30 is extended and expanded into a cylindrical shape. As a result, the ventilation surface area is increased, so that the compressed air is quickly released into the atmosphere through the deaerator 30, and the cement is filtered and remains in the tank 2 and does not fly into the atmosphere.

When the supply of the cement is completed and the supply of the compressed air is stopped, the air pressure in the tank 2 is reduced by the deaerator 30.
To quickly reach the same pressure as the atmosphere. Therefore, the floating effect on the cement caused by the compressed air is reduced, and the cement quickly sinks to the lower portion of the tank 2 by its own weight, so that the operation can be shifted to the spraying operation in a short time. Further, the deaerator 30 is reduced and folded over the exhaust port 4, and the height of the entire device is reduced. In this case, if the vibrations such as hitting the deaerator 30 are applied to remove the cement adhered to the inside, it is possible to immediately respond to the next supply of the cement.

Next, the spraying device is moved to the work site.
Then, the number of screw conveyors 14 that are operated according to the spray width of the cement is determined. Screw conveyor 1
4 operates when the engaging claw 19a of the clutch 18 is engaged, and stops when the engagement is released, so that the clutch 18 of the screw conveyor 14 to be driven is engaged. In the present embodiment, driving the six screw conveyors 14 makes it possible to spray the cement with a width of about 2500 mm.
Cement can be sprayed with a width of 60 mm, and if one screw conveyor 14 is driven, the cement can be sprayed with a width of about 420 mm.

Then, when the hydraulic motor 17 is rotated,
Each screw blade 1 is connected via a sprocket 15 and a chain 16.
3 is driven. By the rotation of the screw blade 13, the cement in the tank 2 is conveyed to the blade 13a and sequentially moves rightward as shown in FIG. Cement is pressurized increase is the conveyance amount reaches the vane 13b, outgoing space in that portion of the peripheral vane 13b
Live. To fill this, the upper cement
After falling, the powder is also consumed from the right side of the tank 2. Then, the cement is conveyed in the discharge tube portion 12, and finally a certain amount of cement falls from the spraying portion 22. This powder is temporarily received on the dispersion plate 23. Since the vibration caused by the traveling of the traveling device 1 is also applied to the dispersion plate 23, the powder is dispersed on the dispersion plate 23.
Is dispersed over a wide area and is spread on the ground with a uniform thickness.

By the way, in a conventional screw conveyor, the screw blades 13 are generally provided with blades 13a having the same pitch over the entire length, and the guide plate 21 in the present embodiment is not used. In this case, the transportation state of the cement will be described with reference to FIG. The cement in the tank 2 is temporarily compressed (consolidated state) in a process of descending by receiving vibrations caused by the traveling of the traveling device 1 (density), and its density increases. The cement having the increased density is filled around the screw blade 13. When the screw blade 13 rotates, the cement supplied from the tip of the screw blade 13 (left side of the tank 2) is gradually conveyed to the right side and dispersed.

However, since the amount of cement transported by the screw blades 13 is constant over the entire area, the cement is consumed sequentially from the left end of the tank 2. That is, tank 2
The surface of the remaining amount of cement in the space moves from the left side of the tank 2 to the empty side, as shown by a chain line, moving in the order of,. Therefore, the center of gravity of the tank 2 temporarily moves to the right side, and the traveling device 1 is inclined. This poses a serious problem for safe driving, since the ground is often soft.

On the other hand, in this embodiment, the screw blade 13
The blades 13a and 13b are provided with blades having different pitches, and the guide plate 21 is mounted above the screw blade 13. The transport amount Q of the powder by the screw blade 13 is Q = kn
-It is represented by p. Here, k is a constant n is the screw blade 13
Is the blade pitch, and the blade 13a pitch p
1 is small, and the pitch p2 of the blades 13b is set to be large.

The amount of cement transport, ie, the amount of spraying, can be adjusted by the number of rotations of the hydraulic motor 17, ie, the number of rotations of the screw blades 13. The higher the number of rotations, the greater the amount of spraying, and the lower the number of rotations. If this is the case, the amount of application will decrease. Further, if the pitch of the blades is increased, the transport amount increases. Therefore,
The blades 13a in the tank 2 have more blades than the transport amount Q1.
13b and the transport amount Q2 in the discharge cylinder 12
Is getting bigger. And the space around the blade 13b
As it occurs, the cement above fills it
Since the cement falls sequentially , the cement in the tank 2 is consumed evenly over the entire area.

Therefore, in this embodiment, the cement is consumed uniformly from the left end to the right end of the tank 2.
That is, since the remaining amount of cement in the tank 2 is indicated by a chain line in FIG. Since the center of gravity of the tank 2 moves little in the left-right direction and descends temporarily, the center of gravity lowers, and the traveling device 1 is stabilized and does not tilt. Therefore, even when the ground is soft, the vehicle can travel safely.

When the cement is conveyed by the screw conveyor 14, a space is created in a corresponding portion around the screw blade 13. In order to fill this, the upper cement falls sequentially. These cements are guided by the guide plate 21 and fall on the inclined portion of the casing 11 as shown by arrows in FIG. During the falling process, the compressed state of the cement that has been compacted is relaxed, the density is made uniform, and the screw blade 1
3 to both sides. And, the screw blade 13 smoothly
And are conveyed.

Further, since two blades 13b are provided on the screw blade 13 in the discharge cylinder portion 12, the sealing performance with the discharge cylinder portion 12 is improved. Therefore, even when the temperature of the cement is high and the cement has fluidity, a certain amount of cement can be conveyed without leaking from the discharge cylinder 12.

The above embodiment has the following advantages. Since one or a plurality of screw conveyors 14 are provided so as to be independently operable, the screw conveyors 14 in a quantity corresponding to the spray width may be driven. Therefore, the driving power at the time of dispersing the powder can be reduced as compared with the case of transporting by a belt conveyor. 2. Screw conveyor 14 according to the spread width of cement
Can be selected, so that the spread width of cement can be freely adjusted.

(3) Since the rotation speed of the hydraulic motor 17 is variable, the amount of cement to be applied can be adjusted as desired by changing the rotation speed of the screw blade 13. 4. Since the discharge cylinder portion 12 is provided on the screw conveyor 14, the powder whose density is made uniform by the guide plate 21 is conveyed and sprayed by a fixed amount, and the accuracy of the spraying amount of the powder is improved. The powder falling from above is introduced into the inlet 1 by the introduction section 12b.
Since the powder is guided to 2a, the powder does not stay in the tank 2.

5, a plurality of types having different pitches, such as 2
Since the blades 13a and 13b of various types are provided, the screw blade 13
The transport amount by the outlet side, ie, the blade 13b, is larger than the transport amount by the inlet side, ie, the blade 13a. Therefore, tank 2
The cement inside the tank 2 is uniformly discharged over the entire area of the tank 2, and the center of gravity of the tank 2 moves less in the left-right direction, gradually lowers, and the stability of the traveling device 1 increases. Also, since the outlet side is not clogged, the cement is smoothly transported.

6, since the blade 13b of the screw blade 13 is composed of two sheets,
The sealing performance inside the discharge tube portion 12 is improved, and a constant transport amount can be secured even when the cement is in a fluidized state due to a rise in temperature. 7. The cement falling in the tank 2
1 and is guided to both sides of the screw blade 13, and is not loaded right above the screw blade 13. Therefore, the load applied to the screw blade 13 is small and the weight of the cement does not cause the screw blade 13 to bend and the density of the powder to be uniform. The accuracy is improved.

8, since the dispersing plate 23 is provided in the dispersing section 22, the powder is spread on the ground over a wide area with a uniform thickness. 9. Since the degassing device 30 is configured so that the ventilation area can be expanded and contracted, when powder such as cement is pumped, the ventilation surface area is increased and the degassing effect and the cement separation effect are enhanced.
In addition, the size is reduced when not in use, so that the overall height can be reduced. 10. Since the deaerator 30 separates the cement, when the cement is supplied to the tank 2, the cement does not scatter in the atmosphere and the vehicle or the surroundings are not polluted by the cement. In addition, since the supplied cement quickly sinks, the operation can be shifted to the spraying operation in a short time.

FIG. 10 shows another embodiment of the present invention. The difference from the above embodiment is that a screw conveyor 14 is used.
A plurality of blades 40 having different pitches p1, p2, p3.
A screw blade 40 having a, 40b, 40c... 40n is provided, and the pitch of the blades on the spraying part 22 side is set to be sequentially larger than the pitch of the blades on the opposite side (p1 <p2 <p3... <pn). . A blade 40a having a pitch p1 is disposed on the left side of the tank 2, and a blade 4a having a pitch pn is disposed in the discharge cylinder 12.
0n is arranged. In this embodiment, since the amount of powder conveyed gradually increases toward the discharge cylinder portion 12, in addition to the above-described effects, the movement of the center of gravity with respect to the traveling device 1 is further reduced, and smooth traveling can be performed smoothly. It has the effect of being able to do so.

[0042]

According to the first aspect of the present invention, there is provided a tank mounted on a traveling device for storing powder of cement, lime, or the like; a supply pipe attached to the tank and fed by pressure with the powder; At least one deaeration device provided on the upper surface portion, a discharge cylinder portion protruding from the tank and having a spraying portion at an end portion , and a lower portion of the tank and provided in the discharge cylinder portion,
A powder conveyor comprising a plurality of independently operable screw conveyors for conveying the powder from one end of the tank to the other discharge cylinder, wherein each screw conveyor has a pitch Screws with different types of blades
With blades, the pitch of the blades on the spraying part side is
Since the pitch is set to be larger than the pitch , the powder in the tank is consumed evenly over the entire area, the center of gravity of the front and rear is less moved, the traveling device can run stably, the driving power is small, and This has an excellent effect that the width of the powder of the cement or the like to be sprayed on the ground can be variously adjusted.

The screw conveyor according to the second aspect of the present invention comprises:
The pitch of the blades near the inlet of the discharge cylinder in the tank is
Since it is set to be larger than the pitch of the opposite blade ,
There is an effect that the powder on the outlet side is not clogged, the powder can be transported smoothly, the center of gravity in the front and rear in the tank is less moved, and the traveling device can travel stably.

The tank according to the third aspect of the present invention is provided with the guide plate which is located above the screw conveyor and guides the descending powder to the side of the screw blade of the screw conveyor, so that the density of the powder is uniform. The screw blade is not bent by the weight of the powder, and the driving power is reduced.

Since the dispersing section of the invention according to the fourth aspect is provided with the dispersing plate for receiving the falling powder, it has an effect that the powder is spread on the ground in a wide range and in a uniform thickness. .

In the degassing device according to the fifth aspect of the present invention, the ventilation area is configured to be expandable and contractable, and the powder is separated at the time of extension, so that the degassing effect and the powder separating effect can be enhanced. In addition, when not in use, the overall height can be reduced.

[Brief description of the drawings]

FIG. 1 is an overall front view.

FIG. 2 is an overall plan view.

FIG. 3 is a side view partially broken away.

FIG. 4 is a perspective view of a part of the screw blade.

FIG. 5 is a front view of a clutch unit.

FIG. 6 is a front view of the deaerator.

FIG. 7 is a view for explaining a conventional powder conveyance state.

FIG. 8 is a diagram illustrating a state of conveying a powder according to the present invention.

FIG. 9 is a diagram illustrating the operation of the guide plate.

FIG. 10 is a front view of a screw conveyor according to another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Traveling device 2 Tank 4 Exhaust port 6 Supply pipe 13 Screw blade 13a Blade 13b Blade 14 Screw conveyor 18 Clutch 21 Guide plate 22 Spraying unit 30 Deaerator 40 Screw blade

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-7-48830 (JP, A) JP 2-42965 (JP, B2) JP-B 2-42966 (JP, B2) 45605 (JP, Y2) Jiko 60-40658 (JP, Y2) (58) Fields investigated (Int. Cl. ⁶ , DB name) E02D 3/12 E02D 19/12

Claims (5)

(57) [Claims] 1. A tank mounted on a traveling device and containing a powder of cement, lime, or the like, a supply pipe attached to the tank and fed with the powder under pressure, and at least one pipe is provided on an upper surface of the tank. A degassing device, a discharge cylinder portion projecting from the tank and having a spraying portion at an end portion , provided at a lower portion of the tank and in the discharge cylinder portion, and dispensing the powder from one end of the tank. A powder dispersing device comprising a plurality of screw conveyors each of which can be independently operated to be conveyed to the other discharge cylinder, wherein each screw conveyor has a plurality of types of blades having different pitches.
Equipped with screw blades with roots, the pitch of the blades on the spraying part side is
A powder spraying apparatus characterized in that the pitch is set to be sequentially larger than the pitch of the blades on the opposite side . 2. The screw conveyor is placed in a tank.
The pitch of the blades near the inlet of the discharge cylinder is
2. The powder spraying apparatus according to claim 1 , wherein the pitch is set larger than the root pitch . 3. The tank according to claim 1, wherein the tank is provided with a guide plate positioned above the screw conveyor to guide the descending powder to a side of a screw blade of the screw conveyor. 2. The powder spraying apparatus according to 2. 4. The powder spraying apparatus according to claim 1, wherein said spraying unit is provided with a dispersion plate which receives the falling powder and distributes the powder widely and uniformly. apparatus. 5. The powder dispersing device according to claim 1, wherein the degassing device is configured to be capable of expanding and contracting a ventilation area, and separates the powder at the time of elongation.