JP2003096818A - Mixing ratio controller of soil improving machine, sediment supply measuring device for use in the same, and self-propelled soil improving machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mixing ratio controller of a soil improving machine, a sediment supply measuring device for use in the same, and a self-propelled soil improving machine, which can produce high-quality improved soil by more accurately measuring sediment supply so as to control a ratio of mixing with a soil improving material. SOLUTION: In the mixing ratio controller of the soil improving machine, the received sediment is mixed with the soil improving material so as to be improved; the sediment, which is conveyed by a carrier conveyor 13, is pressurized by a pressure roller 20B; the height of the sediment, which is pressurized by the pressure roller 20B, is detected by a height detecting means 22 so that the volume of the conveyed sediment can be calculated according to a result of calculation; and soil improving material supply is controlled according to the result of the calculation, so that the ratio of the mixing of the sediment with soil improving material can be controlled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mixing ratio control device for a soil improvement machine for controlling the mixing ratio of soil and soil improvement material, a soil and sand supply amount measuring device used therefor, and a self-propelled soil improvement using the same. It is related to the machine.

[0002]

2. Description of the Related Art In recent years, under the background of promoting waste reuse such as the establishment of a so-called construction recycling promotion plan by the Ministry of Construction (1997), for example, burial work for gas pipes, water and sewer work, and other road works. -At various sites where foundation work etc. are performed, the soil and sand are mixed with the soil improvement material by stirring and mixing, and improved soil products for recycling and improved soil for laying ground on the surface layer of residential land, road subgrades, etc. Needs for self-propelled soil improvement machines to generate are expanding. This self-propelled soil improvement machine is usually a hopper that receives sediment, a conveyer that conveys the sediment in the hopper, a soil improver supply device that supplies the soil improver to the sediment on the conveyer, and a conveyer. It is provided with a mixing device for mixing the soil and sand and the soil improving material introduced from the conveyor to generate the improved soil, and a discharge conveyor for discharging the improved soil derived from the mixing device to the outside of the machine.

As this type of self-propelled soil improvement machine, for example, a so-called mixing type mixing device as described in Japanese Patent Laid-Open No. 2000-45263, which mixes soil and soil with a paddle mixer by stirring, is provided. Also, as described in Japanese Patent Application Laid-Open No. 9-195265, a large number of devices such as those equipped with a so-called crushing type mixing device (crusher) for crushing and mixing earth and sand and a soil conditioner with a rotary impactor have already been proposed. ing.

The self-propelled soil improvement machine described in Japanese Patent Laid-Open No. 2000-45263 measures the weight of earth and sand on the conveyor by means of the conveyor belt between the supporting rollers supporting the conveyor belt of the conveyor. It is equipped with means for measuring the amount of sediment supply. Then, the mixing ratio of the soil and the soil improvement material is controlled by controlling the amount of the soil improvement material supplied by the soil improvement material supply device according to the detection result of the earth and sand supply amount measuring means.

On the other hand, the self-propelled soil improvement machine described in Japanese Patent Application Laid-Open No. 9-195265 discloses a sediment quantification method in which the sediment surface is leveled on the downstream side in the transport direction by the transport conveyor of the hopper so that the height of the transported soil is constant. A supply device is provided. Then, the volume of earth and sand supplied is made constant by this earth and sand constant quantity supply device, and the soil improvement material is supplied to the earth and sand of this constant volume, whereby the mixing ratio of the earth and sand and the soil improvement material is adjusted.

[0006]

Here, in order to produce a good quality improved soil, it is extremely important to set the mixing ratio of the soil and the soil improvement material to a suitable value. The above-mentioned JP-A-200
In the self-propelled soil improvement machine described in Japanese Patent Publication No. 0-45263, it is configured to detect the supply weight of earth and sand and control the supply amount of the soil improvement material according to the detection result. The accuracy of detection by the means for measuring the amount of sediment supply is important for the realization. Further, since the sediment supply amount measuring means is configured to detect the transported sediment weight through the conveyor belt, in order to accurately measure the transported sediment weight, the conveyor belt is provided before and after the conveyor belt so that the conveyor belt is sufficiently bent. It is necessary to secure a sufficient space between the supporting rollers that support the.

However, if the distance between the support rollers is sufficiently widened, the length of the conveyor in the longitudinal direction becomes long, and the length of the self-propelled soil improvement machine as a whole becomes long. Since the self-propelled soil improvement machine is generally often transported by a transportation means such as a trailer, transportation restrictions are specified for the captain, and such lengthening of the captain is not always preferable. Thus, in this conventional technique,
It is difficult to increase the distance between the support rollers due to dimensional constraints, and the reliability of the detection results of the earth and sand supply amount measuring means may be reduced by that amount. Therefore, there is still room for improvement.

On the other hand, in the self-propelled soil improving machine described in Japanese Patent Laid-Open No. 9-195265, the volume of earth and sand to be supplied is constant, and the soil improving material is supplied to the earth and sand of this constant volume. ing. However, with the recent expansion of the needs described above, for example, sandy soil with low viscosity, sand with high water content, or cohesive soil with an extremely small particle size, etc. The nature of the soil has become extremely diverse. Therefore, the bulk density of the earth and sand cut out from the hopper varies greatly depending on the nature of the earth and sand and the state of the earth and sand put into the hopper, and the weight per unit volume fluctuates. As a result, even if the volume of earth and sand cut out from the hopper is constant and it seems that the earth and sand supply amount is constant, if this is converted into weight, the actual earth and sand supply amount fluctuates. Therefore, it is difficult to control the mixing ratio of the soil and the soil improving agent with high accuracy simply by supplying the soil improving agent to the apparently constant amount of the supplied soil like the conventional technique.

The present invention has been made based on the above-mentioned matters, and an object thereof is to measure the supply amount of earth and sand more accurately to control the mixing ratio with the soil improvement agent.
A mixing ratio control device of a soil improvement machine capable of producing high quality improved soil, and a soil and sand supply amount measuring device used therefor,
Another object is to provide a self-propelled soil improvement machine using these.

[0010]

(1) In order to achieve the above object, the present invention provides a mixing ratio control device for a soil improvement machine, which mixes and reforms received soil with a soil improvement material,
Pressurizing means provided at a downstream position on the conveyor for conveying the earth and sand received by the hopper, and pressurizing the earth and sand conveyed by the conveyor, and earth and sand for measuring the volume of earth and sand pressurized by the pressure means. The volume measuring means and the control means for controlling the supply amount of the soil improvement material based on the detection value of the soil volume measuring means are provided.

In the present invention, by providing a pressurizing means for pressing the earth and sand on the conveyor conveyed to the outside of the hopper, the bulk density of the earth and sand cut out from the hopper by the conveyor can be made substantially constant. . Then, the volume of the transported earth and sand that has become a substantially constant bulk density in this way,
The amount of sediment supply can be measured more accurately by measuring the volume of sediment. As a result, regardless of the properties of the target soil and the state of the hopper, it is possible to accurately measure the amount of earth and sand supplied by the conveyor, and the controller can control the amount of soil improvement material with high accuracy. be able to. Therefore, the mixing ratio of the earth and sand and the soil conditioner can be controlled to a more suitable value, and high quality improved soil can be produced.

(2) In the above (1), preferably,
The pressurizing unit includes a rotating body that is supported so as to be vertically movable with respect to the earth and sand on the conveyor and is rotatable in a direction following the earth and sand surface on the conveyor.

(3) In the above (1) or (2), and more preferably, the earth and sand volume measuring means is pressurized by the speed detecting means for detecting the earth and sand conveying speed of the conveyor and the pressurizing means. And a height detecting means for detecting the height of the earth and sand.

(4) In (3) above, preferably, a plurality of the height detecting means are provided, and the earth and sand volume measuring means calculates an average value of the detection values of the plurality of height detecting means.

(5) In order to achieve the above object, the present invention is also directed to the earth and sand supply amount measuring device of the earth improving machine for mixing and modifying the received earth and sand with the soil improving material to receive the earth and sand received by the hopper. Provided at a position on the downstream side on the transport conveyor for transporting, comprising a pressurizing means for pressurizing the sand transported by the transport conveyor, and a sediment volume measuring means for measuring the volume of the sand pressurized by this pressurizing means. The configuration.

(6) In order to achieve the above-mentioned object, the present invention is a self-propelled soil improvement machine which mixes the received soil with a soil improvement agent and reforms it, and a hopper for receiving the input soil. A conveyor for conveying the earth and sand received by this hopper, and provided on this conveyor,
Pressurizing means for pressurizing the earth and sand conveyed by the conveyor, earth and sand volume measuring means for measuring the volume of earth and sand pressed by the pressurizing means, and the soil improvement based on the detection value of the earth and sand volume measuring means And a control means for controlling the supply amount of the material.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a self-propelled soil improvement machine of the present invention will be described below with reference to the drawings. Self-propelled soil improvement machine, for example, construction generated soil improvement such as construction generated soil generated at a construction site, etc. is mixed with a soil improvement material on site to produce an improved soil product for recycling,
Alternatively, the soil that has been excavated from the surface of a site for construction of residential land, etc. can be modified on the spot to generate improved soil that can be backfilled to the surface for strengthening the ground, or excavation of a specified location within the site such as a site for road construction. It is widely used in surface soil stabilization treatment, etc., in which the soil obtained is modified on the spot to produce improved soil to be laid as a roadbed material.

FIG. 1 is a side view showing the overall structure of an embodiment of a self-propelled soil improvement machine of the present invention, FIG. 2 is a top view thereof, and FIG. 3 is a front view seen from the left side in FIG. 1 to 3, reference numeral 1 denotes a traveling body, and this traveling body 1 is a left / right 1
It is composed of a pair of traveling devices 2 and a pair of main body frames 3 extending substantially parallel to the upper portion of the traveling device 2. Further, 4 is a track frame of the traveling device 2, and the track frame 4 is connected to the lower part of the body frame 3. Reference numerals 5 and 6 are driven wheels (idlers) and drive wheels provided at both ends of the track frame 4, 7 is a crawler belt (a crawler track) wound around the driven wheels 5 and 6 and 8 is a drive wheel 6. It is a drive unit directly connected. 9a,
Reference numeral 9b denotes a plurality of support posts standing on the body frame 3, and these support posts 9a and 9b are the support posts 1a and 1b.
It supports 0 and 11.

Reference numeral 12 denotes a hopper (details will be described later) that receives the soil to be modified, and the hopper 12 is formed in a substantially frame shape having upper and lower openings. One side (left side in Fig. 1)
Supported by. Further, the earth and sand to be modified is often thrown in by a heavy loading machine such as a hydraulic excavator,
This hopper 12 has a
It is formed to expand upward.

Reference numeral 13 denotes a conveyor for conveying the earth and sand received by the hopper 12. The conveyor 13 is located below the hopper 12 and has an inlet cylinder 49 of a mixing device 47 which will be described later.
(Refer to FIG. 6) It extends upwardly upward.
Reference numeral 14 denotes a conveyor frame of the transfer conveyor 13, and the conveyor frame 14 has the support posts 9a and 9b.
It is supported by etc. 15A and 15B are driving wheels and driven wheels provided at both ends of the conveyor frame 14, respectively.
Reference numeral 16 denotes a conveyor belt wound around the drive wheel 15A and the driven wheel 15B, and 17 denotes a plurality of support rollers for supporting the conveyor surface of the conveyor belt 16. In addition, the drive wheel 15
A drive device 18 (see FIG. 7, which will be described later) that drives the drive wheel 15A to circulate the transport belt 16 is connected to A.

FIG. 4 is a side sectional view schematically showing the structure of the hopper 12. In FIG. 4, reference numeral 12A is a sediment outlet cut out at the lower end of the wall surface on the downstream side (the right side in FIG. 4) in the sediment conveying direction of the conveyor 13 of the hopper 12, and the sediment outlet 12A is the conveyor belt 1 of the conveyor 13.
It is formed to have a predetermined width (a width slightly narrower than that of the conveyor belt 16) and a predetermined height so as to be opposed to 6. That is, the earth and sand in the hopper 12 is cut out by the conveyor 13 at the width and height of the earth and sand outlet 12A.

Reference numeral 19 denotes a sediment outlet 12A on the outer wall surface of the hopper 12.
The bracket fixed to the upper side, 20 is this bracket 19
On the other hand, it is a swinging roller supported so as to be rotatable (swingable) via a pin 21. The swing roller 20 includes an arm 20A connected to the bracket 19 and the arm 20A.
And a pressure roller 20B rotatably provided at the tip of the. That is, the pressure roller 20B moves up and down following the irregularities of the surface of the transported earth and sand on the conveyor belt 16 cut out from the earth and sand outlet 12A, and rotates while following the surface of the transported earth and sand. As a result, the earth and sand that have passed through the pressure roller 20B are pressurized with a predetermined force by the weight of the pressure roller 20B, and the bulk density thereof becomes substantially constant.

Reference numeral 22 is a height detecting means provided above the pressure roller 20B. The height detecting means 22 is supported by a frame 23 located on the support frame 10 (see FIG. 3). The height detecting means 22 is composed of an ultrasonic sensor known as this type, and detects the time until the transmitted ultrasonic wave is reflected by the pressure roller 20B and returns. The detection result is output to the volume calculation circuit 24 (see FIG. 7, which will be described later) described later as needed. The pressure roller 20B and the height detecting means 2
2 is provided between the hopper 12 and the soil improvement material supply device 27 (described later) on the conveyor 13.

Returning to FIG. 1 to FIG. 3, 27 is a soil-improving material supplying device for adding the soil-improving material to the earth and sand on the conveyor 13. This soil-improving material supplying device 27 has a substantially rectangular horizontal cross section. Storage tank 28 for improving material, screw feeder 29 for leading out the soil improvement material in this storage tank 28, and substantially quadrangular pyramid shape that plays a role of a funnel for guiding the soil improvement material in storage tank 28 to the screw feeder 29. And a shoot 30 of Also, the storage tank 2
Reference numeral 8 is composed of a bellows portion 32, which is connected to a flange-shaped frame plate 31 above the chute 30, and a top plate portion 33 which covers the top of the bellows portion 32. Reference numeral 34 designates an inlet (see FIG. 2) for filling the soil-improving material, which is provided substantially in the center of the top plate 33, and 35 is an opening / closing lid of the soil-improving material inlet 34. It is attached to 33 by a hinge 36 (see FIG. 2).

A plurality of (three in this example) mounting portions 37 are provided on the outer peripheral portion of the top plate portion 33, and a support column 38 is fixedly erected below the mounting portions 37. Has a pin hole 39 (only the upper one is shown in FIGS. 1 and 3) at a predetermined position. 40 is a substantially frame-shaped base plate supported by the support frame 11, 41 is a plurality of guide cylinders standing on the base plate 40, and the guide cylinders 41 support the frame plate 31 of the chute 30 described above. is doing. In addition, a pin hole (not shown) is formed near the tip of the guide cylinder 41. That is, each of the columns 38
Are slidably inserted in the guide cylinders 41 in the vertical direction so as to be able to project to below the base plate 40.
By expanding and contracting, the height of the storage tank 28 is variable.

Reference numeral 42 is a stopper pin for fixing the column 38 to the guide cylinder 41, and the stopper pin 42 is the guide cylinder 4
It is to be inserted into the pin hole 39 of the support column 38 via the pin hole (not shown) of FIG. That is, for example, at the time of operation or the like, the bellows portion 32 is extended, and the stopper pin 42 is inserted into the pin hole 39 on the lower side of the support column 38 through the pin hole of the guide cylinder 41 to obtain the state shown in FIG. The storage tank 28
When the self-propelled soil improvement machine is transported by a trailer, etc., the bellows portion 32 is contracted and the pin hole 39 on the upper side of the support column 38 is inserted through the pin hole of the guide cylinder 41. By inserting the stopper pin 42, the total height of the self-propelled soil improvement machine can be maintained in a state of being lowered to a height that clears the transportation restriction.

Reference numeral 43 denotes a casing of the screw feeder 29. The casing 43 is formed in a substantially cylindrical shape and has a screw 44 inside. The screw 44 is rotationally driven by a drive device 44A (see FIG. 7 described later), and the screw feeder 29 uses the soil improvement material introduced into the casing 43 from the chute 30 described above.
It is designed to be transferred to the left side in FIG. Then, from the outlet of the soil improvement material (not shown) provided at the lower part of one side (left side in FIG. 1) in the longitudinal direction of the casing 43, the conveyor 13
A certain amount of the soil improvement agent is added to the earth and sand conveyed near the downstream side (right side in FIG. 1) of the conveyance direction. As shown in FIG. 1, the screw feeder 2
No. 9 is arranged so that its upstream side in the transfer direction (right side in FIG. 1) enters the lower space, and it is lower than the downstream side in the transfer direction (left side in FIG. 1). The height of the material supply device 27 is designed to be low.

Reference numeral 45 denotes a crane (see FIGS. 2 and 3) provided on one side (upper side in FIG. 2) of the self-propelled soil conditioner. This crane 45 is one side (in the width direction) of the self-propelled soil conditioner. It is provided on a support base 46 attached to the main body frame 3 (on the left side in FIG. 3). In addition, the crane 45 is mounted on the support base 4
6, a support portion 45A that is provided upright from above, and this support portion 45A.
The arm 45B has a base end pivotally connected to A, expands and contracts in the longitudinal direction, and swings substantially horizontally, a cylinder 45C for raising and lowering the arm 45B, and a winch 45D provided at the tip of the arm 45B. Normally, when the soil improvement material is filled in the storage tank 28, the upper opening / closing lid 3
5 is opened and the flexible container is lifted by this crane 45 and inserted into the soil improvement material receiving port 34.

At this time, although not shown in particular for the purpose of preventing complication, the top plate portion 33 is provided with a cutter with its tip directed upward so as to be located substantially directly below the soil improvement material receiving port 34 in the storage tank 28. Has been. As a result, the flexible container inserted into the soil improvement material receiving port 34 by the crane 45 is pressed against the cutter by its own weight and the bottom portion is torn, and the soil improvement material flows out into the storage tank 28 from here. There is.

Reference numeral 47 is a mixing device for mixing the soil and sand introduced from the conveyer 13 and the soil conditioner to produce improved soil. 5 is a horizontal sectional view showing the detailed structure of the mixing device 47, and FIG. 6 is a side sectional view taken along the line VI-VI in FIG. 5 and 6, reference numeral 48 denotes a substantially box-shaped main body of the mixing device 47, and the mixing device main body 48 has an inlet tube for soil and soil improvement material at an upper part on one side in the longitudinal direction (left side in FIG. 6). The body 49 is provided with an outlet cylinder 50 for improved soil at the lower part of the other side (right side in FIG. 6). 48A is a lid that constitutes the upper surface of the mixing device body 48 excluding the inlet cylinder 49, and a plurality of lids 48A (three in this example) together with the inlet cylinder 49 on the mixing device body 48. They are installed side by side and bolted together. That is, by removing the lid 48A and the inlet tube 49, the upper surface of the mixer main body 48 can be entirely opened. However, the lid 48A may have a single-sheet structure.

Reference numeral 51 denotes a plurality (two in this example) of paddle mixers provided in the mixer main body 48. The paddle mixers 51 are arranged substantially parallel to the longitudinal direction of the mixer main body 48 (horizontal direction in FIG. 5). The rotary shaft 52 is hollow (may be solid), and a plurality of paddles 53 are radially provided on the rotary shaft 52. The paddle 53 has a smooth surface inclined by a predetermined angle with respect to the axial direction of the rotary shaft 52 (in this case, the right direction in FIG. 5) so as to face the rotational direction of the paddle mixer 51.

Reference numeral 54 denotes a bearing that rotatably supports both ends of the rotary shaft 52 of the paddle mixer 51, 55 denotes a gear provided at the other end (right end in FIG. 5) of the rotary shaft 52, and 56 denotes a drive device for the paddle mixer 51. Output shaft 56a of this drive device 56
Is directly connected to the other end (right end in FIG. 5) of the rotary shaft 52.
Further, the gears 55 of the adjacent rotary shafts 52 are meshed with each other so that the adjacent paddle mixers 51 are rotationally driven in the opposite directions at substantially the same rotational speed.

With such a structure, the mixing device 47 is
The earth and sand and the soil conditioner introduced from the conveyer 13 through the inlet cylinder 49 are mixed by the paddle mixer 51 (strictly speaking, the paddle 53) to form improved soil, which is then transferred to the opposite side and downward from the outlet cylinder 50. It is supposed to be derived. 57 is a gear box including the gear 55 and the like, 58 is scraped off the generated improved soil toward the outlet cylinder 50,
It is a scraping blade that prevents compaction of the improved soil onto the inner wall of the mixing device body 48 on the outlet cylinder 50 side.

Returning to FIGS. 1 to 3, 59 is the mixing device 4.
7 is a discharge conveyor for discharging the improved soil derived from 7 to the outside of the machine. The discharge conveyor 59 extends from below the outlet cylinder 50 (see FIG. 6) of the mixing device 47 to the outside (in this case, the right side in FIG. 1). After extending substantially horizontally for a predetermined distance, it extends upward from the lower part of the driving device 56 of the mixing device 47.

Reference numeral 60 denotes a conveyor frame of the discharge conveyor 59. The conveyor frame 60 has a support member 6
It is supported by the power unit 68, the main body frame 3 and the like, which will be described later, through the components 1, 62 and the like. 63 is this discharge conveyor 59
Drive wheels provided at the downstream (right side in FIG. 1) end in the transport direction of
64 is a conveyor belt, and the conveyor belt 64 is a drive wheel 6
3 and the driven conveyor (not shown) provided on the upstream side (left side in FIG. 1) in the transport direction of the discharge conveyor 59. 65
Is a plurality of support rollers for supporting the conveying surface of the conveyor belt 64, and 66 is a drive device (see FIG. 2) directly connected to the drive wheel 63. The drive device 66 rotationally drives the drive wheel 63 to convey the conveyor belt 64. It is designed to be driven in circulation. In addition, 67 is a side cover of the discharge conveyor 59,
The side covers 67 are provided on both upper sides of the conveyor frame 60 in the width direction (vertical direction in FIG. 2).

Reference numeral 68 denotes the power unit mentioned above. The power unit 68 is supported on the other end (right side in FIG. 1) in the longitudinal direction of the main body frame 3 via a support member 69. The power unit 68 is not particularly shown in order to prevent complication, but at least one hydraulic pump that discharges pressure oil to be supplied to the drive unit of each device described above, an engine that drives this hydraulic pump, and a hydraulic pressure. A plurality of control valves for controlling the direction and flow rate (or only direction) of the pressure oil supplied from the pump to each drive device are provided inside.

Reference numeral 70 denotes a driver's seat provided in a section on the front side (left side in FIG. 1) of the power unit 68.
A pair of operation levers 71 for operating the drive device of the traveling device 2 and an operation panel 72 (see FIG. 2) for operating the drive devices of other devices such as the drive device 56 of the mixing device 47 are provided. There is.

Here, in the present embodiment, the amount of soil improvement agent supplied is controlled by the mixing ratio controller in accordance with the amount of earth and sand supplied by the conveyor 13. FIG. 7 shows a block diagram of a portion related to the mixing ratio control of the mixing ratio control device. In FIG. 7, reference numeral 74 is a sediment volume measuring means for measuring the volume of the sediment carried on the conveyor 13, and the sediment volume measuring means 74 is the height detecting means 22 and the volume computing circuit 24 mentioned above. And a speed detecting means 75 for detecting the number of rotations of the drive device 18 of the conveyor 13 (see FIG. 1). The volume calculation circuit 24 is adapted to calculate the drive speed (that is, the earth and sand conveyance speed) of the conveyor belt 16 (see FIG. 1) in the conveyor 13 from the detection value of the speed detection means 75. Further, as described above, the volume detecting means 24 is adapted to input the detection result of the height detecting means 22, and based on the detected height of the pressure roller 20B (see FIG. 4), The height of the transported sediment after pressurization is calculated.

That is, the transported sediment is the above-mentioned sediment outlet 12A.
Since it is cut out from the hopper 12 with the width (see FIG. 4),
The earth and sand volume measuring means 74 is configured to calculate the earth and sand volume per unit time after pressurization by multiplying the earth and sand width by the earth and sand height and the transportation speed calculated by the volume operation circuit 24. .

76 is the screw feeder 29 (see FIG.
The rotation speed detector of the drive device 44A (see the reference), the rotation speed detector 76 outputs the detection result to the control means 73 at any time. Then, the control means 73 is configured to calculate the amount of the soil quality improving material being supplied based on the detection result of the input rotation speed detector 76 by the stored soil quality improving material supply amount calculation circuit 73a. Reference numeral 73b is a mixing ratio setting circuit that takes in the mixing ratio of the earth and sand and the soil improvement material set and input by the operation panel 72 (see FIG. 2), and 73c is the volume calculation based on the input result of the mixing ratio setting circuit 73b. A soil quality improvement material required amount calculation circuit for calculating the soil quality improvement material supply amount required for the detection result of the transported soil volume input from the circuit 24, both of which are stored in the control means 73.

Reference numeral 73d is a comparator for comparing the calculation results of the soil quality improvement material demand amount calculation circuit 73c and the soil quality improvement material supply amount calculation circuit 73a. This comparator 73d judges the excess or deficiency of the soil improvement material supply amount each time on the basis of the input required amount, and instructs the drive device 44A of the screw feeder 29 to make the soil improvement material supply amount approximate to the required amount. The control signal for controlling the rotation speed is calculated and output, and is also stored in the control means 73. That is, in the present embodiment, the control means 73 controls the soil quality improving material supply device 2 according to the detected (calculated) value of the soil volume measuring means 74.
7 (strictly speaking, the screw feeder 29) controls the amount of the soil improvement agent supplied.

Next, the operation and action of the self-propelled soil improvement machine of the present embodiment having the above configuration will be described. For example, when the earth and sand to be modified is put into the hopper 12 by a hydraulic excavator or the like, the earth and sand received by the hopper 12 is placed on the conveyor 13 below and conveyed. The soil quality improving material supply device 27 supplies the soil quality improving material in the storage tank 28 to the earth and sand conveyed by the conveyor 13 by the screw feeder 29 in constant amounts. Then, the earth and sand and the soil conditioner introduced into the mixing device 47 by the conveyer 13 are uniformly stirred and mixed by the paddle mixer 51,
It is led out as improved soil on the discharge conveyor 59. The improved soil is conveyed by the discharge conveyor 59 and finally discharged outside the self-propelled soil improvement machine.

Usually, in this type of self-propelled soil improvement machine, a conveyer or the like for supplying earth and sand from the hopper to the mixing apparatus is provided with a means for measuring earth and sand supply such as a conveyor scale to detect the earth and sand detected. The amount of soil improvement material supplied is controlled relative to the amount supplied. However, since the conveyor scale is configured to detect the transported earth and sand weight via the conveyor belt, in order to measure the transported earth and sand weight more accurately, the conveyor belt is supported before and after the conveyor belt so that the conveyor belt bends sufficiently. It is necessary to secure a sufficient space between the support rollers. However, if the distance between the supporting rollers is sufficiently widened, the length of the conveyor in the longitudinal direction becomes long, and the length of the entire self-propelled soil improvement machine becomes long. This is not always preferable in a self-propelled soil improvement machine where the captain is restricted due to transportation restrictions, etc., and it is difficult to extend the captain. Due to such a background, the accuracy of measurement of the weight of sediment carried on the conveyor may not always be sufficient.

In some cases, for example, earth and sand are cut out from the hopper by a constant volume, and the amount of the soil conditioner supplied to the earth and sand of a constant volume is simply controlled. However, in recent years, the properties of the soil to be modified by the self-propelled soil conditioner have become extremely diverse, and the bulk density of the soil cut out from the hopper depends on the properties of the soil and the loading condition of the sand into the hopper. Vary greatly and the weight per unit volume varies. As a result, even if the earth and sand are cut out from the hopper by a constant volume and apparently supplied in a fixed amount, the earth and sand supply amount actually varies. Therefore, it is difficult to accurately control the mixing ratio of the soil and the soil improving agent with a configuration that simply controls the amount of the soil improving agent supplied to a constant volume of the supplied soil.

Also in the present embodiment, the earth and sand outlet 12A having a predetermined opening area is provided in the hopper 12 in order to cut out the earth and sand in a constant volume, but the earth and sand outlet 12A is simply provided.
The height and bulk density of the earth and sand that are cut out after passing through are actually varied depending on the nature of the earth and sand and the state of being put into the hopper 12.

Therefore, in the present embodiment, the pressure roller 20B is provided, and the soil on the conveyor 13 cut out of the hopper 12 is pressed with a predetermined force to reduce the bulk density of the cut soil. It is configured to be almost constant. That is, by appropriately pressurizing the bulk density of the transported earth and sand to be substantially constant and then measuring the volume of the transported earth and sand, the property of the soil to be modified and the state of being put into the hopper 12 are not affected, and the conveyer conveyer is not affected. The amount of sediment supply by 13 can be measured accurately. Then, based on the measurement result of the highly reliable earth and sand supply amount, the control means 7
Since the supply amount of the soil improvement agent is controlled by 3, the mixing ratio of the soil and the soil improvement agent can be approximated to a desired set value. Therefore, the mixing ratio of the earth and sand and the soil conditioner can be controlled to a more suitable value, and high quality improved soil can be produced.

Although the height of the pressure roller 20B is detected in this embodiment, the height of the arm 20A may be detected, for example. The point is that the height of the part that moves up and down can be detected by following the unevenness of the earth and sand. Further, a configuration in which the height of the transported earth and sand on the downstream side of the pressure roller 20B is directly detected is also conceivable. Further, instead of detecting the height of the pressure roller 20B or the like, for example, the inclination angle of the arm 20A supporting the pressure rotor 20B may be detected and converted to the height. Furthermore, although the pressure roller 20B is configured to be driven to rotate following the surface of the earth and sand, the pressure roller 20B may be rotationally driven by a separately provided driving device.
In this case, it is more preferable that the rotation speed of the pressure roller 20B be substantially the same as the soil conveyance speed.

Another embodiment of the self-propelled soil improvement machine of the present invention will be described below. FIG. 8 is a side sectional view schematically showing the structure of a hopper provided in another embodiment of the self-propelled soil improvement machine of the present invention, and is a view corresponding to FIG. 4 described above. However,
The same parts as those in the previous drawings are designated by the same reference numerals and the description thereof will be omitted. In FIG. 8, reference numeral 77 denotes the support frame 10 described above.
(See FIG. 3) An upper frame, 78 is an arm that rotatably supports the pressure roller 20B at its lower end, and this arm 78 is inserted through an insertion opening 77a provided in the frame 77 so as to be vertically slidable, End plate 78 on top
a is fixed. Reference numeral 79 is a housing for slidably holding the end plate 78a, 80 is a holding plate slidable inside the housing 79, and the holding plate 80 is provided with a spring 81 to connect the end plate 7a.
It is located above 8a. 78b is the end plate 7
8a is a protrusion of the housing 79
The side surface is guided by a slit (not shown) provided parallel to the sliding direction of the end plate 78a, and is always positioned below the height detecting means 22. Reference numeral 82 denotes a pressing force adjusting screw screwed onto the upper end surface of the housing 79. The pressing force adjusting screw 82 adjusts the vertical position of the pressing plate 80 and adjusts the spring force of the spring 81. Other configurations are the same as those in the above-described one embodiment.

That is, in the present embodiment, the earth and sand conveyed is pressed with a predetermined force by the own weight of the pressure roller 20B and the urging force of the spring 81, and the protruding portion 78b.
By detecting the height of the soil and calculating the height of the soil after pressurization, the supply amount of the soil improvement material is controlled in the same manner as in the above-described one embodiment.

Also in this embodiment, the same effect as that of the above-described embodiment is obtained, and the vertical position of the pressing plate 80 is adjusted by the pressurizing force adjusting screw 82, whereby the spring 81 to the pressure roller 20B is moved. Since the biasing force can be adjusted,
By adjusting the pressure applied to the earth and sand, it is possible to give a wide range of adjustment of the bulk density of the conveyed earth and sand. This allows
The bulk density of the transported earth and sand can be adjusted to a desired value, and the earth and sand supply amount can be measured more accurately.

Still another embodiment of the self-propelled soil improvement machine of the present invention will be described. FIG. 9 is a side sectional view schematically showing the structure of a hopper provided in still another embodiment of the self-propelled soil improvement machine of the present invention, and is a view corresponding to FIG. 4 described above.
However, the same parts as those in the previous figures are designated by the same reference numerals and the description thereof will be omitted. In FIG. 9, reference numeral 83 is a bracket provided on the outer wall surface of the hopper 12 above the earth and sand outlet 12A, and this bracket 83 supports an arm 85 via a pin 84 so as to be rotatable (swingable). 86 is a pressure plate having a predetermined mass.
It is rotatably connected to the tip of the arm 85 through. The pressurizing plate 86 is formed below the height detecting means 22 in such a manner that the lower side is formed in a substantially arc shape as shown in FIG. 9 and the upper side is formed smoothly. Other configurations are the same as those in the above-described one embodiment.

That is, in the present embodiment, the pressure plate 86 follows the unevenness of the surface of the transported earth and sand,
The pressing plate 86 pressurizes the transported earth and sand by its own weight to make the bulk density of the transported earth and sand constant, and the pressing plate 8
The height of 6 is detected and the height of the soil after pressurization is calculated. Then, using this calculation result, the supply amount of the soil improvement material is controlled as in the above-described embodiment. Also in this embodiment, the same effect as that of the above-described one embodiment is obtained.

Although the height of the pressure plate 86 is detected in the present embodiment, the height of the arm 85 may be detected, for example. The point is that the height of the part that moves up and down can be detected by following the unevenness of the earth and sand. Further, a configuration in which the height of the transported earth and sand on the downstream side of the pressure plate 86 is directly detected, or a configuration in which the inclination angle of the arm 85 is converted into the height can be considered.

Each of the embodiments of the present invention described above is, for example, a self-propelled soil improvement machine equipped with a sieve device,
It is also applicable to a self-propelled soil improvement machine equipped with a soil improvement material supply device provided with a so-called rotary feeder. The self-propelled soil improvement machine having such a configuration will be described below.

FIG. 10 is a side view showing the overall structure of a self-propelled soil improvement machine equipped with a sieve device and a soil improvement material supply device provided with a rotary feeder, and FIG. 11 is a top view thereof. However, in these FIG. 10 and FIG. 11, the same reference numerals are given to the portions that perform the same functions as those in the previous drawings. The self-propelled soil improvement machine shown in FIGS. 10 and 11 and the previous FIG.
The main structural difference from the self-propelled soil improvement machine shown in FIG. 3 is that, as described above, the sieving device 92 is provided above the hopper 12 to sort the input sand according to the particle size. A so-called rotary feeder 93 is provided as a soil-improving-material supplying means of the soil-improving-material supplying device 27. The rest of the configuration is almost the same as the self-propelled soil improvement machine shown in FIGS.

In FIGS. 10 and 11, 94 is a frame body as the main body of the screen device 92 having upper and lower openings, 95 is a spring for supporting the frame body 94 on the support frame 10 in a vibrating manner, and 96 is a frame body 94. 10 is a grid (see FIG. 11) mounted inside the grid, and the grid 96 is inclined so that the left side in FIG. 10 is lowered. Reference numeral 97 is an eccentric drum, and the eccentric drum 97 is a rotary shaft (not shown) inserted through the frame 94.
Are provided at both ends, and the center of gravity is separated from the center of rotation by a predetermined distance. Reference numeral 98 is a driving device for the sieving device 92 (see FIG. 11), and 99 is a driving force for the driving device 98.
It is a belt that is transmitted to 7.

That is, in the sieving device 92, the eccentric drum 97 is rotated to vibrate the entire device on the support frame 10. As a result, of the earth and sand that have been thrown in, large lumps having a particle size equal to or larger than the size of the grid 96 and foreign substances are removed and discharged to the outside of the machine (in this case, the left side in FIG. 10), and the particle size is the grid 96. Those smaller than the mesh size are selected and introduced into the hopper 12 as the soil to be modified.

Although not shown in the figure for the purpose of preventing complexity,
The rotary feeder 93 has a built-in rotary drive rotor in which a plurality of partition walls are radially provided on the rotary shaft, and the soil improvement material received in the space between the partition walls of the rotor from the storage tank 28 located at the upper part is stored in the rotary feeder 93. The soil and sand on the transport conveyor 13 located below are sequentially added. Similarly, although not particularly shown, this self-propelled soil improvement machine is provided with a stirring means for cutting out the soil improvement material to the rotary feeder 93 near the bottom of the storage tank 28, and the rotary feeder for the soil improvement material is provided. Care is taken to ensure smooth supply to 93.

The above-described respective embodiments of the present invention can be applied to the self-propelled soil improvement machine as shown in FIGS. 10 and 11 as described above, and similar effects can be obtained. be able to.

Further, the self-propelled soil improvement machine shown in FIGS. 10 and 11 is a sieve device 92 constituted by a so-called vibrating sieve.
However, the above-described embodiments of the present invention can be applied to a self-propelled soil improvement machine in which a simple stationary type sieve that does not vibrate is provided above the hopper. It is needless to say that the configuration described above can be applied to a so-called slant provided above the sieving device 92 in consideration of the ability of the sieving device 92 to feed the soil. Similar effects are obtained in these cases.

Here, the self-propelled soil improvement machine of FIGS.
In any of the self-propelled soil conditioners of FIGS. 10 and 11, the basic structure of receiving the soil and mixing it with the soil conditioner to generate the improved soil is similar to each other. It has versatility for various soil improvement works such as the above-mentioned soil improvement for construction and surface ground stabilization treatment.

However, in the self-propelled soil improvement machine shown in FIGS. 10 and 11, the sieve device 92 removes large foreign matters and large lumps contained in the soil to be reformed in advance, so that the foreign matter mixing amount is increased accordingly. It has the merit of being able to produce high-quality improved soil with less waste. Therefore, for example, it is particularly suitable for the construction soil improvement such as the construction soil generated at a construction site or the like is mixed with the soil improvement material on the site to generate an improved soil product for recycling.

On the other hand, generally, when a large amount of soil improvement material is supplied, the screw feeder can adjust the supply amount of the soil improvement material more accurately than the rotary feeder. Therefore, the self-propelled soil improving machine equipped with the soil improving agent supply device for supplying the soil improving agent by the screw feeder has an advantage that it can deal with various kinds of soil to be improved. That is, the self-propelled soil improvement machine of FIGS. 1 to 3 for supplying the soil improvement material by the screw feeder 29 is shown in FIGS.
Compared to the self-propelled soil improvement machine, it has the merit of being able to handle a wider variety of properties.

Further, particularly in the self-propelled soil improvement machine of FIGS. 1 to 3, for example, it is possible to deal with earth and sand containing large lumps or stones, earth and sand having high viscosity, etc., which are difficult to pass through the lattice. Therefore, the sieving device is omitted in advance. Therefore, for example, by modifying the earth and sand excavated on the surface of the site for construction of residential land, etc. on the spot,
Generate improved soil to backfill the surface to strengthen the ground,
It exhibits its performance especially in surface ground stabilization treatment, such as modifying the soil obtained by excavating a predetermined place on the site at a road construction site, etc. to generate improved soil to be laid as a roadbed material. You can do it.

Here, in the above, the pressure roller 20 is used.
B, a pressure plate 86 is provided at a downstream position on a conveyor for conveying the earth and sand received by the hopper described in the claims, and constitutes a pressing means for pressurizing the earth and sand conveyed by the conveyor. At the same time, the rotary pair is supported so as to be movable up and down with respect to the earth and sand on the conveyor and is rotatable in a direction following the earth and sand surface on the conveyor.

Further, although the height detecting means 22 is constituted by the ultrasonic sensor in the above, the invention is not limited to this, and an optical or contact type displacement sensor or an angle sensor may be used. The point is that a sensor that can detect the height of the earth and sand should be used as appropriate. Further, although the pressure roller 20B is configured to be driven to rotate with respect to the surface of the transported earth and sand, it may be configured to be rotationally driven by itself as described above. Similar effects are obtained in these cases. Further, a plurality of height detecting means 22 may be provided, and an average value of the respective detection results may be calculated by the sediment volume measuring means 74 (strictly speaking, the volume calculating circuit 24). in this case,
In addition to the same effect, it is possible to further improve the measurement accuracy of sediment volume.

Finally, in the above, the self-propelled soil improvement machine provided with the so-called crawler type traveling device 2 having the crawler belt 7 has been described as an example, but the present invention is not limited to this, and a so-called wheel type traveling body may be used. It may be equipped with a self-propelled soil improvement machine. Also, the self-propelled soil improvement machine equipped with the so-called mixing system mixing device 47 including the paddle mixer 51 has been described as an example.
Instead of a mixing device equipped with a screw mixer, or a self-propelled soil improvement machine equipped with a so-called crushing type mixing device for crushing and mixing earth and sand and a soil conditioner using a high-speed rotating rotary impactor or the like. The above-described embodiments and modifications of the present invention are applicable. Similar effects are obtained in these cases.

[0068]

According to the present invention, by providing the pressurizing means for pressing the earth and sand on the conveyor conveyed to the outside of the hopper, the bulk density of the earth and sand cut out from the hopper by the conveyor is made substantially constant. be able to. Then, the volume of the transported earth and sand that has become a substantially constant bulk density in this way,
By measuring with a sediment volume measuring device, the amount of sediment supply can be measured more accurately. This makes it possible to accurately measure the amount of earth and sand supplied by the conveyor regardless of the property of the earth and sand to be modified and the state of being put into the hopper. Therefore, the control device can control the mixing ratio of the soil and the soil improving agent to a more preferable value, and it is possible to generate high quality improved soil.

[Brief description of drawings]

FIG. 1 is a side view showing the overall structure of an embodiment of a self-propelled soil improvement machine of the present invention.

FIG. 2 is a top view showing the overall structure of an embodiment of the self-propelled soil improvement machine of the present invention.

FIG. 3 is a front view showing the entire structure of one embodiment of the self-propelled soil improvement machine of the present invention, as viewed from the left side in FIG. 1.

FIG. 4 is a side sectional view schematically showing the structure of a hopper provided in an embodiment of the self-propelled soil improvement machine of the present invention.

FIG. 5 is a horizontal cross-sectional view showing the detailed structure of a mixing device provided in an embodiment of the self-propelled soil improvement machine of the present invention.

FIG. 6 is a side sectional view taken along the line VI-VI in FIG. 5, showing the detailed structure of the mixing device provided in the embodiment of the self-propelled soil improvement machine of the present invention.

FIG. 7 is a block diagram of a portion related to the mixing ratio control of the mixing ratio control device provided in the embodiment of the self-propelled soil improvement machine of the present invention.

FIG. 8 is a side sectional view schematically showing the structure of a hopper provided in another embodiment of the self-propelled soil improvement machine of the present invention, and is a view corresponding to FIG. 4.

FIG. 9 is a side sectional view schematically showing the structure of a hopper provided in still another embodiment of the self-propelled soil improvement machine of the present invention, and is a view corresponding to FIG. 4.

FIG. 10 is a side view showing the entire structure of a self-propelled soil improvement machine to which the present invention can be applied, which is equipped with a soil improvement material supply device equipped with a sieve device and a rotary feeder. is there.

FIG. 11 is a top view showing the entire structure of a self-propelled soil improvement machine which is a self-propelled soil improvement machine to which the present invention can be applied and which is equipped with a soil improvement material supply device equipped with a sieve device and a rotary feeder. is there.

[Explanation of symbols] 12 hoppers 13 Conveyor 20B pressure roller (pressure means, rotating body) 22 Height detection means 24 Volume calculation circuit 27 Soil improvement material supply device 73 Control means 74 Sediment volume measuring means 75 Speed detection means 86 Pressure Plate (Pressure Means)

Continued front page    (72) Inventor Takashi Moro             Hitachi Construction Machinery Co., Ltd.             Ceremony Company Tsuchiura Factory (72) Inventor Hiroki Takeuchi             Hitachi Construction Machinery Co., Ltd.             Ceremony Company Tsuchiura Factory F-term (reference) 2D040 AB07 CD07 EB04                 4G035 AB48 AE13                 4G037 AA06 BA06 BB23 EA03

Claims (6)

[Claims] 1. A mixing ratio control device for a soil improver for mixing received soil with a soil improving agent to modify the soil, which is provided at a downstream side position on a conveyor for conveying the earth received by a hopper, Pressurizing means for pressurizing the earth and sand conveyed by the conveyor, earth and sand volume measuring means for measuring the volume of earth and sand pressed by this pressurizing means, and the soil improving material based on the detection value of the earth and sand volume measuring means. A mixing ratio control device for a soil improvement machine, comprising: a control means for controlling a supply amount. 2. The mixing ratio control device for a soil improvement machine according to claim 1, wherein the pressurizing means is supported so as to be vertically movable with respect to the earth and sand on the conveyor, and on the earth and sand surface on the conveyor. A mixing ratio control device for a soil improvement machine, comprising a rotating body rotatable in a copying direction. 3. The mixing ratio control device for a soil improvement machine according to claim 1 or 2, wherein the sediment volume measuring means includes a velocity detecting means for detecting a sediment conveying speed of the conveyer, and a pressurizing means. A mixing ratio control device for a soil improvement machine, comprising: height detecting means for detecting the height of the pressed soil. 4. The mixing ratio control device for a soil improvement machine according to claim 3, wherein a plurality of the height detecting means are provided, and the earth and sand volume measuring means calculates an average value of detection values of the plurality of height detecting means. A mixing ratio control device for a soil improvement machine, which is characterized by calculation. 5. A sediment supply amount measuring device of a soil improving machine for mixing the received soil with a soil improving agent for reforming, wherein the device is provided at a downstream side position on a conveyor for transporting the soil received by a hopper, Measuring the amount of sediment supply of a soil improvement machine, comprising: a pressurizing means for pressurizing the earth and sand conveyed by a conveyor, and a earth and sand volume measuring means for measuring the volume of earth and sand pressed by the pressurizing means. apparatus. 6. A self-propelled soil improvement machine that mixes the received earth and sand with a soil improvement agent and reforms it, and a hopper that receives the input earth and sand, and a conveyor that conveys the earth and sand received by this hopper, Pressurizing means provided on the conveyor, for pressurizing the earth and sand conveyed by the conveyor, earth and sand volume measuring means for measuring the volume of earth and sand pressed by the pressurizing means, and detection of the earth and sand volume measuring means A self-propelled soil improvement machine comprising: a control means for controlling the supply amount of the soil improvement material based on a value.