JP3396453B2 - Soil mixing improver - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soil mixing and improving machine mainly used for reusing excavated residual soil produced as a result of construction and civil engineering work as improved soil, and more particularly to a mixing ratio of raw materials and solidifying materials. Control technology to stabilize.

[0002]

2. Description of the Related Art Soil mixing and improving machines use excavated soil (raw material)
Through a sorting machine, and the raw material after sorting, which has been sorted by sieving here, is subjected to a solidifying material mixing step, a crushing step, a 2 by a belt conveyor.
It is designed to be sequentially transported to the next sorting step and the like.
In addition, in the sorting machine, while removing foreign matters such as large stones and wood chips in the excavated residual soil, loosening the raw material by sieving sorting,
If the size is smaller than the sieve size, it will pass through, and if the size is larger than the sieve size, it will be discharged.

In the soil mixing and improving machine, as a condition for stabilizing the quality of the product (improved soil), it is possible to stabilize the mixing ratio of the raw material and the solidifying material to be constant. Conventionally, as a technique for controlling the amount of the solidifying material added to the raw material, Japanese Patent Application Laid-Open No. 9-1
The one described in Japanese Patent No. 17799 is known. In this conventional technique, first, the density and water content of the raw material conveyed by the belt conveyor are detected, and the detected values are compared with past data to solidify the solidification material in an amount corresponding to the density and water content of the raw material. Add with feeder. Next, while detecting the amount of raw material conveyed with the solidifying material added, measure the amount of solidifying material decrease in the solidifying material tank (amount of solidifying material used), and calculate the solidifying material addition amount based on this to solidify By feeding back to the material addition amount calculation device, the control method is to correct the solidification material addition amount.

Further, a lower chute is provided between the sorting machine and the belt conveyor, and after the raw material after sorting from the sorting machine is received by the lower chute and is guided to be fed onto the belt conveyor, it is also fed onto the belt conveyor. The sorted raw material is conveyed to the solidifying material mixing step along with the transfer of the belt conveyor through the carry-out port formed in the lower chute. At this time, since the raw material after sorting is continuously dropped from the sorting machine, the raw material after sorting supplied on the belt conveyor through the lower chute is the raw material after sorting previously supplied on the belt conveyor. As shown in FIG. 6, the upper chute 3 is conveyed in the state of being overlapped with the upper chute 3, and the discharge port 3 of the lower chute 3
In the second portion, the post-sorting raw material M1 is deposited with a cross-sectional area exceeding the opening area of the carry-out port 32. In the figure, 2 is a belt conveyor. In this way, when the raw material after sorting occurs in the front part of the carry-out port, the shearing stress of the raw material after sorting is high, especially when the viscosity of the raw material after sorting is high or when it is hard clay, so the raw material after sorting is high. Is forced to pass through the carry-out port, and as a result, an overload is applied to the drive of the belt conveyor, the belt conveyor is stopped, that is, the transfer line is stopped, and the entire soil mixing improver stops operating. Occurs.

Conventionally, as a technique for eliminating the accumulation of the raw material when the raw material is conveyed from the raw material inlet to the next step, especially at the carry-out port of the raw material receiving hopper, for example, Japanese Patent Laid-Open No. 11-165878, FIG. As shown in FIG. 4 and FIG. 5, there is known a rotor provided at an upper portion on the front side of the carry-out port. This rotor is arranged so that its rotation axis direction is orthogonal to the transfer direction of the belt conveyor (the direction in which the raw material is conveyed), and the rotation of the rotor makes the cross-sectional area of the raw material to be conveyed constant and the outlet The object of the present invention is to reduce the cross-sectional area of the conveyed product to be smaller than the opening area of or the opening area of the machine for the next process. However, in reality, when the amount of the fed raw material is large, the rotor may rather compact the raw material. On the contrary, if the input raw material is small,
The rotor and the raw material do not come into contact with each other, and the transported raw material is discharged without being compacted, resulting in a difference in the density of the raw material.

[0006]

In the conventional control method of the amount of solidifying material added, the data table is required because the detected values of the density and the water content of the raw material are compared with the past data, and the solidification is performed. Measure the amount of solidified material in the state where the material is added and the amount of solidified material decrease in the solidified material tank (solidified material usage amount), calculate the amount of solidified material addition based on this, and feed back to the solidified material means. The control becomes complicated, and since the density and the water content of the raw material are detected, the cost burden increases because the detection means is required. in this way,
The feed amount of raw material is detected after the solidifying material is added, and the feed amount is controlled by feedback control.
Since it is an indirect means for correcting the addition amount of the solidifying material, there is a problem that the control becomes complicated.

Further, as in the conventional case, when the raw material to be deposited on the carry-out port portion of the raw material hopper, the lower chute or the like is forcedly solidified by the rotor, the raw material placed on the belt conveyor is The pressing force varies depending on the amount, and as a result, the density of the raw material varies depending on the location, which causes a large variation in the raw material transportation amount. Therefore, in the solidifying material mixing step, there is a problem in that the control of adjusting the addition amount of the solidifying material depending on the amount of raw material conveyed by the belt conveyor is hindered. Further, since the pressing force of the raw material by the rotor acts as a braking force on the belt conveyor, a load is applied to the driving of the belt conveyor, and the raw material is pressed and solidified by the rolling pressure, so that the mixing cutter in the solidifying material mixing step is used. Also, the load applied to the crushing cutter in the crushing process becomes large, and it becomes necessary to increase each driving force accordingly. There is also a problem that the size of the driving means increases and the cost burden increases and the size of the device also increases.

The present invention has been made to solve the above-mentioned conventional problems, and a mixing ratio of a raw material continuously conveyed by a belt conveyor and a solidifying material added by a solidifying material supply device. A first object is to provide a soil mixing and improving machine capable of stabilizing the soil by simple control. In addition, the raw material after sorting, which is about to be deposited on the discharge port of the lower chute, is not pressed and solidified but is diffused by the rotating blades, so that the raw material after sorting is maintained in a state of being unraveled by the sorting machine and the solidifying material mixing step. The second object is to provide a soil mixing and improving machine in which the variation of the raw material transportation amount is suppressed and the mixing ratio can be easily controlled.

[0009]

In order to solve the above-mentioned problems, the soil mixing improving machine of the present invention (Claim 1) is a sorting machine for sieving raw materials, and a sieving / sorting machine with this sorting machine. A belt conveyer for carrying the sorted raw material to the solidifying material mixing step, and a solidifying material supply device provided in the solidifying material mixing step, and a carrying amount detecting means for continuously detecting the raw material carrying amount by the belt conveyor. And a conveyor transfer speed adjusting means for adjusting the transfer speed of the belt conveyor to adjust the raw material transfer amount, and a solidifying material addition amount switching means for switching the solidifying material addition amount by the solidifying material supply device to a plurality of stages, and the conveying amount. The solidifying material addition amount corresponding to the raw material conveying amount detected by the detecting means is selected by the solidifying material addition amount switching means, and the raw material conveying amount corresponding to the selected solidifying material addition amount is calculated, Conveyer and configured to increase or decrease the rate of migration of the belt conveyor by transition speed adjusting means.

In this soil mixing and improving machine, the excavated soil as a raw material is put into a sorting machine, which removes foreign matters such as large stones and wood chips from the raw material (excavated soil), and sifts the raw material. The shavings are loosened, those below the sieve size pass through this sorter, and those above the sieve size are discharged. The sorted raw material that has been sieved and sorted by this sorter is supplied onto a belt conveyor, and is conveyed to the solidifying material mixing step as the belt conveyor moves. In the solidifying material mixing step, the solidifying material is added and mixed with the raw material after selection by the solidifying material supply device. In this case, the addition amount of the solidifying material can be switched in a plurality of stages by the solidifying material addition amount switching means, and the solidifying material addition amount corresponding to the raw material conveying amount detected by the conveying amount detecting means is the solidifying material addition amount switching means. Selected by. Then, the raw material transport amount corresponding to the selected solidifying material addition amount is calculated, and the moving speed of the belt conveyor is adjusted by the conveyor moving speed adjusting means, whereby the raw material carrying amount depends on the solidifying material addition amount. It is possible to stabilize the mixing ratio of the raw material and the solidifying material.

Further, in the soil mixing improving machine of the present invention,
A lower chute is provided between the sorter and the belt conveyor to receive the sorted raw material and guide it on the belt conveyor.The lower chute is provided with an outlet for the sorted raw material. There is a mode (claim 2) in which a rotary blade for diffusing the raw material is provided in the upper part of the front side of the carry-out port.

In this embodiment, the sorted raw material sieved by the sorting machine is received by the lower chute, is guided by the lower chute and is supplied onto the belt conveyor, and is passed through the carry-out port formed in the lower chute to be conveyed through the belt conveyor. Is transferred to the solidifying material mixing step. When the raw material after sorting is attempted to be deposited on the carry-out port of the lower chute, the rotary blades provided on the front upper side of the carry-out port diffuse the raw material after sorting by the rotation of the rotary vane. Can be prevented. Since the rotary blades are provided in the lower chute, the sorted raw materials scattered by diffusion are guided by the lower chute and supplied again onto the belt conveyor.

Since the raw material after selection is diffused by the rotary blades in this manner, the raw material after selection is not pressed and solidified. Therefore, it is possible to suppress variations in the amount of raw material conveyed due to compaction, and it is possible to reduce the load applied to the driving of the belt conveyor. That is, it is possible to eliminate the variation in the amount of raw material conveyed by conveying the raw material after sorting in a state of being loosened by passing through a sorter, and in particular, like the present invention, depending on the amount of solidifying agent added. In the control for adjusting the raw material transportation amount, there is no variation in the raw material transportation amount, which leads to stable control. Therefore, as in this embodiment, when the sorted raw material to be deposited is diffused by the rotary blades, the sorted raw material on the belt conveyor can be maintained in a loosened state (the sorted raw material diffused by the rotary blades is a solidifying material. In the mixing step and the crushing step, it can be more easily loosened, and a good kneading state can be maintained), and the material can be conveyed to the solidifying material mixing step in a state in which variations in the amount of raw material conveyed are eliminated. Incidentally, in the case where the rotor is provided at the transfer port as in the conventional case, even if the raw material is unraveled by using the sorting machine, the raw material is compacted by the rotor, and there is no meaning of unraveling the raw material by the sorting machine. Therefore, it becomes difficult to control the amount of the raw material conveyed corresponding to the amount of the solidifying material added.

[0014]

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a side view showing a main part of a soil mixing improving machine according to one embodiment of the present invention, FIG. 2 is a block diagram for explaining a control method of a solidifying material mixing ratio in the soil mixing improving machine, and FIG. FIG. 4 is a side view showing a mounting portion of a rotary blade provided in the soil mixing and improving machine, FIG. 4 is a plan view showing a mounting portion of the rotary blade, and FIG. 5 is a front view showing a mounting portion of the rotary blade.

In the figure, reference numeral 1 is a sorting machine, in which a sieve 11 is installed in a grid body 10 equipped with a vibrating machine (not shown), and the grid body 10 is fed from a hopper 12 while vibrating. Sifting excavated soil M
By removing the foreign matter such as large stones and wood chips from the excavated residual soil M, the residual excavated soil M is removed by sieving.
The shavings are loosened, those having a sieve size or less pass through this sorter 1, and those having a sieve size or more are discharged.

A belt conveyor 2 is provided below the sorting machine 1. This belt conveyor 2 is an electric motor 2
Drive pulley 20a and tail pulley 20b connected to 0
The belt 21 is hung between the belt 21 and
The intermediate of the above is supported by a large number of auxiliary pulleys 22, and the sorted raw material M1 sieved by the sorting machine 1 is conveyed to the solidifying material mixing step 5.

A lower chute 3 is provided between the sorting machine 1 and the belt conveyor 2. This lower shoot 3
Has a receiving port 30 that opens downwardly of the sorter 1 at the upper end, a supply port 31 that opens upwardly of the belt conveyor 2 at the lower end, and a carry-out port 32 at the lower end of the front face. ing. Therefore, the sorted raw material M1 that has been sifted and sorted by the sorting machine 1 is received in the receiving port 30 of the lower chute 3, is guided by the lower chute 3 and is supplied from the supply port 31 onto the belt conveyor 2, and the carry-out port 32 is provided. It is conveyed to the solidifying material mixing step 5 through the passage through the belt conveyor 2.

Inside the lower chute 3, inside the upper part of the front side of the carry-out port 32, two rotary blades 4, 4 for diffusing the raw material are arranged side by side. This rotary vane 4
The rotating shaft 41 connected to the drive motor 40 is provided with four diffusion blades 42 radially. The rotating shaft 41 is arranged so that its axial direction is the same as the transfer direction of the belt conveyor 2 in plan view. The diffusion blades 42 are axially supported by the front wall 33 of the lower chute 3, and each of the diffusion blades 42 is bent and formed so that its tip end surface 42a faces in the radial direction. The rotation direction of both rotary blades 4, 4 is set so that the opposite side rotates from top to bottom, and both rotary blades 4, 4 are displaced forward and backward as shown in FIG. , Diffusion blade 4
2, 2 and 42 are arranged so as to overlap each other in a front view as shown in FIG.
It is arranged so as to slightly enter the carry-out port 32 from the upper edge of the.

The belt conveyer 2 has a feed amount detecting means 60 (weight detecting portion 60) for continuously detecting the feed amount of the raw material.
a and a belt speed detector 60b), and a conveyor transfer speed adjusting means 61 (inverter) that adjusts the transfer speed of the belt conveyor 2 to adjust the amount of raw material transfer.
The conveyor transfer speed adjusting means 61 is used for the belt conveyor 2
Adjust the number of rotations of the electric motor 20 of the belt conveyor 2
Adjust the transition speed of.

In the solidifying material mixing step 5, the solidifying material supply device 5 is used.
0 and a mixing cutter 59 are provided. The solidifying material feeder 50 is provided with a solidifying material feeder 52 by a screw conveyor at the bottom of a solidifying material tank 51. The solidifying material feeder 52 is an electric motor 5 as a driving means.
3, and the number of rotations of the electric motor 53 is switched to a plurality of stages (for example, three stages) so that the solidified material supplying device 5
A solidifying material addition amount switching means 62 for switching the solidifying material addition amount depending on 0 to a plurality of stages is provided. Mixing cutter 59
Is disposed ahead of the solidifying material supplying device 50, and mixes the raw material M1 after selection in a state where the solidifying material is added by the solidifying material supplying device 50 with stirring. Therefore, the post-sorting raw material M1 supplied onto the belt conveyor 2 is added with the solidifying material (quick lime, cement, etc.) by the solidifying material feeding device 50 in the solidifying material mixing step 5, and is unraveled and stirred by the mixing cutter 59 again. And subsequently conveyed to the crushing step 9,
Here, it will be crushed, stirred, and kneaded. In the figure, 63 is a passage sensor for confirming whether or not the raw material M1 has been conveyed by the belt conveyor 2, and when the conveyance of the raw material M1 is detected, the solidifying material supply device 50
Is activated and the solidified material supply device 50 is stopped when the conveyance of the raw material is not detected.

Therefore, in this soil mixing and improving machine, as shown in FIG. 2, when the excavated residual soil M, which is a raw material, is fed to the sorter 1, large stones, wood chips, etc. in the excavated residual soil M are discharged by the sorter 1. Foreign matter is removed, and the excavated residual soil M is loosened by sieving, and those having a sieve size or less pass through this sorter 1, and those having a sieve size or more are discharged.
The sorted raw material M1 thus sieve-sorted is supplied onto the belt conveyor 2 through the lower chute 3,
It is conveyed to the solidifying material mixing step 5 through the carry-out port 32 as the belt conveyor 2 moves. Then, in the solidifying material mixing step 5, the solidifying material supply device 50 adds and mixes the solidifying material to the sorted raw material M1. In this case, the addition amount of the solidifying material is switched by the solidifying material addition amount switching means 62, and the solidifying material addition amount switching means 62 selects the solidifying material addition amount corresponding to the raw material transportation amount detected by the transportation amount detecting means 60. To be done. Then, the material transfer amount corresponding to the selected solidifying material addition amount is calculated, and the transfer speed of the belt conveyor 2 is adjusted by the conveyor transfer speed adjusting means 61, whereby the raw material transfer amount is the solidifying material addition amount. It is possible to stabilize the mixing ratio of the raw material and the solidifying material.

When the sorted raw material M1 is about to be deposited on the outlet 32 of the lower chute 3, the rotary blades 4, 4 provided on the front upper side of the outlet 32 rotate the sorted raw material M1. Disperse so that it can be removed horizontally. This prevents the post-sorting raw material M1 from accumulating on the carry-out port 32 portion.

As described above, since the sorted raw material M1 is diffused by the rotary blades 4 and 4, the sorted raw material M1 is not compacted. Therefore, it is possible to suppress the variation in the amount of raw material conveyed due to compaction, and it is possible to reduce the load applied to the driving of the belt conveyor 2. In particular, since the sorted raw material M1 to be accumulated is diffused by the rotary blades 4 and 4, the sorted raw material M1 loosened by the sorter 1 can be maintained in its loosened state (the sorted blades 4 and 4 are sorted. The post-raw material M1 can be further loosened) and can be transported to the solidifying material mixing step 5 in a state in which the variation in the raw material transport amount is eliminated. As described above, by transporting the sorted raw material M1 in a state of being loosened by passing through the sorting machine 1 by the belt conveyor 2, variations in the raw material transport amount are eliminated, and in particular, the raw material M1 depending on the amount of the solidifying material added. In this control method of adjusting the carry amount, there is no variation in the carry amount of the raw material, which leads to stable control.

As in the embodiment, when the two rotary blades 4 and 4 are arranged side by side and rotated counter to each other from top to bottom, the diffusion blades 42 and 42 scrape the raw material M1 after selection. Since the raw material M1 is diffused so as to be lowered, it is possible to prevent the raw material M1 after sorting from jumping in the lower chute 3 as compared with the case where the raw material M1 after sorting is scraped. Also, both rotary blades 4, 4
When the blades are displaced back and forth, and the diffusion blades 42, 42 are arranged so as to overlap each other in a front view, the raw material M1 is not left unscraped after the sorting, and the tips of the diffusion blades 42, 42 are disposed in the outlet 32. When the raw material M1 after sorting is made to be slightly lower than the opening height of the transport outlet 32 by allowing the raw material M1 to slightly enter the carry-out outlet 32 from the upper end edge, it is possible to reliably prevent the raw material M1 after sorting from being deposited.

Although the embodiments of the present invention have been described above with reference to the drawings, the specific configuration of the present invention is not limited to this.

[0026]

As described above, the soil mixing improver (Claim 1) of the present invention has a simple control method in which the feed amount of raw material is adjusted in accordance with the addition amount of the solidifying material. By controlling, the mixing ratio of the raw material continuously conveyed by the belt conveyor and the solidifying material added by the solidifying material supply device can be stabilized.

If a rotary blade is provided at the carry-out port of the lower chute (claim 2), the sorted raw material to be deposited here is not pressed but solidified by the rotary blade, so that the sorted raw material is collected. It can be maintained in a disentangled state by a sorter and can be conveyed to the solidifying material mixing step, which suppresses variations in the amount of raw material conveyed and facilitates control of the mixing ratio of the raw material and the solidifying material.

[Brief description of drawings]

FIG. 1 is a side view showing a main part of a soil mixing and improving machine according to a first embodiment of the present invention.

FIG. 2 is a block diagram for explaining a control method of a solidifying material mixing ratio in this soil mixing improving machine.

FIG. 3 is a side view showing a mounting portion of rotary blades provided in the soil mixing and improving machine.

FIG. 4 is a plan view showing a mounting portion of the rotary blade.

FIG. 5 is a front view showing a mounting portion of the rotary blade.

FIG. 6 is a side view showing a deposited state of raw materials after sorting.

[Explanation of symbols]

1 sorter 2 belt conveyor 3 Lower shot 4 rotating blades 5 Solidifying material mixing process 20 electric motor 32 carry-out exit 42 Diffusion blade 50 Solidifying material supply device 52 Solidifying material feeder 53 electric motor 60b Belt speed detector 60a Weight detector 60 Transport amount detecting means 61 Conveyor transfer speed adjusting means 62 Solidifying material addition amount switching means M excavation residual soil M1 Raw material after sorting

Claims (2)

(57) [Claims] 1. A sorting machine for sieving raw materials,
It is equipped with a belt conveyer for conveying the sorted raw materials that have been sifted and sorted by this sorter to the solidifying material mixing step, and a solidifying material feeding device provided in the solidifying material mixing step, and the amount of raw material conveyed by the belt conveyor is continuously Conveyance amount detecting means for detecting, conveyor transfer speed adjusting means for adjusting the transfer speed of the belt conveyor to adjust the raw material conveying amount, and solidifying material addition amount switching means for switching the solidifying material addition amount by the solidifying material supply device to a plurality of stages The solidifying material addition amount corresponding to the raw material conveying amount detected by the conveying amount detecting means is selected by the solidifying material addition amount switching means, and the raw material conveying amount corresponding to the selected solidifying material addition amount is calculated, A soil mixing and improving machine, characterized in that the transfer speed of a belt conveyor is adjusted by a conveyor transfer speed adjusting means. 2. The soil mixing and improving machine according to claim 1, wherein a lower chute is provided between the sorter and the belt conveyor to receive the sorted raw material and guide the supply on the belt conveyor. A soil mixing and improving machine in which a rear material carrying-out port is formed, and a rotary blade for diffusing the material is provided inside the lower chute and above the front side of the carrying-out port.