JP2005036526A - Self-propelled soil improving machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a self-propelled soil improving machine which prevents deterioration in quality of improved soil by positively fixing a mixing ratio of soil and soil improving agent to a constant value. <P>SOLUTION: The self-propelled soil improving machine is comprised of a transporting conveyor 13 stretched from below a hopper 12 to a mixing device 47; a screw feeder 29 for feeding the soil improving agent to the soil conveyed by the transporting conveyor 13; a height sensor 22 and a rotational speed sensor 25 for detecting an amount of the soil conveyed by the transporting conveyor 13; a mixing ratio control device 75 for arithmetically operating a required amount of the soil improving agent, based on a detected value, and controlling a feeding amount of the soil improving agent by the screw feeder 29; and a discharging conveyor 59 extended from below the mixing device 47 to the outside of a main body frame 3 on a side opposite to the mixing device in a longitudinal direction. According to the soil improving machine, the mixing ratio control device 75 compares the calculated required amount of the soil improving agent with a feeding capacity of the screw feeder 29, and controls a transporting speed of the transporting conveyor 13. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a soil improvement machine that mixes earth and sand with a soil improvement material to generate improved soil.

  In recent years, the construction of so-called construction recycling promotion plans by the Ministry of Construction (1997) has led to the reuse of waste, such as the construction of gas pipes, waterworks and sewerage, and other road construction and foundation work. A self-propelled type that mixes and mixes earth and sand with soil improvement materials at various sites where it is produced, and generates improved soil products for recycling and ground reinforcement for laying on the surface layer of residential land and roadbeds. The need for soil improvement machines is expanding.

  This self-propelled soil improvement machine usually includes a hopper that receives earth and sand, a conveyor that conveys the earth and sand in the hopper, and a soil improvement material supply device that supplies soil improvement material to the earth and sand conveyed by the conveyor. The mixing means for mixing the earth and sand introduced from the conveyor and generating the improved soil, and the discharge conveyor for discharging the improved soil derived from the mixing means to the outside of the machine are provided.

  In the self-propelled soil improvement machine having such a configuration, it is extremely important to maintain the mixing ratio of soil and soil improvement material at a suitable value in order to generate high-quality improved soil.

  Therefore, conventionally, a self-propelled soil improvement machine that detects the amount of earth and sand transported by the transport conveyor and controls the supply amount of the soil quality improvement material according to the amount of transport earth and sand has been proposed (for example, Patent Document 1). reference.). This self-propelled soil improvement machine calculates the required amount of soil improvement material based on the detection value of the sediment volume detection means (sediment volume measurement means) that detects the amount of sediment transported by the transport conveyor and the sediment volume detection means. And a control means for controlling the supply amount of the soil improvement material supply device, so that the soil improvement material can be supplied to the soil at a constant mixing ratio.

JP 2003-96818 A

However, there are the following problems in the above-described prior art.
That is, in the above-described prior art self-propelled soil improvement machine, as the soil improvement material supply device, a screw feeder that pushes and supplies the soil improvement material by rotating a screw, or a rotor provided with a radial partition plate is rotated. The rotary feeder that supplies the soil improvement material introduced between the partition plates is used, but in general, these screw feeders and rotary feeders are designed to be driven within a predetermined rotational speed range unique to the equipment. The soil quality improving material can be supplied within the range of the supply amount (in other words, the supply capacity) corresponding to the rotation speed range.

  For example, if you want to increase the amount of soil improvement work due to changes in the properties of the material soil, etc., the amount of soil improvement material is increased in accordance with the amount of soil supply. When the soil improvement material is supplied near the upper limit, the required amount of the soil improvement material exceeds the supply capacity of the soil improvement material supply device. In this case, the supply amount of the soil quality improving material is relatively small with respect to the transported sand and sand, and there is a possibility that the quality of the final improved soil is deteriorated.

  The present invention has been made in view of the above-mentioned problems of the prior art, and its purpose is to prevent deterioration of the quality of the improved soil by ensuring that the mixing ratio of the earth and sand and the soil conditioner is constant. It is to provide a self-propelled soil improvement machine that can do.

  (1) In order to achieve the above object, the present invention provides a self-propelled soil improvement machine that mixes and reforms received earth and sand with a soil improvement material to improve the main body frame and traveling means provided on the main body frame. The mixing means provided on the main body frame, the earth and sand receiving hopper provided on one side in the longitudinal direction of the main body frame, and the earth and sand received by the hopper provided from the lower part of the hopper to the mixing means. A transporting conveyor for transporting to the mixing means, a soil quality improving material supply device for supplying a soil quality improving material to the soil transported by the transporting conveyor, and a sediment amount detecting means for detecting the amount of sediment transported by the transporting conveyor; The soil improvement material requirement amount is calculated based on the detection value of the soil amount detection means, and the supply amount of the soil improvement material supply device is controlled in accordance with the calculated soil improvement material requirement amount. A control means for controlling the transport speed of the transport conveyor by comparing the calculated amount of requested soil improvement material and the supply capacity of the soil improvement material supply device, and the other longitudinal direction of the main body frame from below the mixing means A discharge conveyor that extends outward to the side and discharges the improved soil generated by the mixing means to the outside of the machine.

  In the present invention, when the earth and sand received by the hopper is conveyed by the conveyor, the amount of earth and sand detected by the earth and sand amount detecting means, and the control means calculates the required amount of soil improvement material based on the detected value, The supply amount of the soil improvement material supply device is controlled in accordance with the calculated soil improvement material requirement amount. In this way, the soil improvement material is supplied to the earth and sand transported by the transport conveyor so as to have a constant mixing ratio, and these soil and soil improvement material are mixed by the mixing means, and the generated improved soil is discharged to the discharge conveyor. Is discharged outside the self-propelled soil improvement machine.

  Here, as a soil conditioner supply device for a soil conditioner, generally, a screw feeder that pushes and supplies a soil conditioner by rotating a screw, or a rotor provided with a partition plate in a radial direction is rotated to rotate between the partition plates. A rotary feeder or the like that supplies the soil quality improvement material introduced in is used, but these screw feeders and rotary feeders are driven within a predetermined rotational speed range specific to the equipment, and supply corresponding to the rotational speed range The soil quality improving material can be supplied within the amount range (in other words, within the supply capacity range).

  At this time, for example, if you want to increase the amount of soil improvement work due to changes in the properties of the material soil, the amount of soil improvement material is increased in accordance with the amount of soil supply. When the soil improvement material is supplied near the upper limit of the capacity, the required amount of the soil improvement material exceeds the supply capacity of the soil improvement material supply device. In this case, the supply amount of the soil quality improving material is relatively small with respect to the transported sand and sand, and there is a possibility that the quality of the final improved soil is deteriorated. On the other hand, for example, when it is desired to reduce the amount of soil improvement work, if the soil improvement material is supplied near the lower limit of the supply capacity of the soil improvement material supply device, the required amount of soil improvement material is It falls below the lower limit of the supply capacity of the device. In this case, the supply amount of the soil quality improving material is relatively large with respect to the transported sand and sand, and this may also cause a deterioration in the quality of the final improved soil.

  On the other hand, in the present invention, the transport speed of the transport conveyor is controlled by comparing the required amount of soil improvement material calculated by the control means with the supply capacity of the soil improvement material supply device. That is, as described above, when the amount of soil improvement material calculated by increasing the amount of earth and sand conveyed by the conveyor exceeds the upper limit of the supply capacity of the soil improvement material supply device, the control means It is possible to reduce the amount of transport sediment by reducing the transport speed. On the other hand, when the required amount of soil improvement material calculated by reducing the amount of sediment transported by the transport conveyor falls below the lower limit of the supply capacity of the soil improvement material supply device, the transport speed of the transport conveyor is increased by the control means. It is possible to increase the amount of transported sediment quickly. In this way, according to the present invention, the required amount of soil improvement material can be reliably kept within the supply capacity range of the soil improvement material supply device, so that the mixing ratio of soil and soil improvement material is reliably constant. Can be. As a result, deterioration of the quality of the improved soil can be prevented.

  (2) In the above (1), preferably, the control means transports the transport conveyor when the calculated required amount of soil improvement material is larger than an upper limit value of a supply capacity range of the soil improvement material supply device. The speed shall be reduced.

  (3) In the above (2), more preferably, the control means is configured such that when the calculated amount of requested soil improvement material is smaller than a lower limit value of a supply capacity range of the soil improvement material supply device, the control means The transport speed is increased.

  (4) In any one of the above (1) to (3), and preferably, the earth and sand amount detecting means is a earth and sand volume detecting means for measuring a volume of earth and sand conveyed by the conveyor, and is conveyed by the conveyor. It is assumed that at least one of a soil and sand weight detecting means for measuring the weight of the soil and the improved soil weight detecting means for measuring the weight of the improved soil discharged by the discharge conveyor is provided.

  According to the present invention, the transport speed of the transport conveyor is controlled by comparing the required amount of soil improvement material calculated by the control means with the supply capacity of the soil improvement material supply device. Thereby, since the required amount of soil improvement material can be kept within the supply capacity range of the soil improvement material supply device, the mixing ratio of soil and soil improvement material can be made constant. As a result, deterioration of the quality of the improved soil can be prevented.

  Hereinafter, an embodiment of a self-propelled soil improvement machine of the present invention will be described with reference to the drawings. The soil improvement machine according to the present embodiment generates, for example, improved soil that is excavated from the surface layer of a residential land construction site and backfilled to the surface layer for ground reinforcement, This is a self-propelled soil improvement machine used for surface ground stabilization processing, such as generating improved soil to be laid as roadbed material by modifying soil obtained by excavating a predetermined location.

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. The traveling body 1 includes a traveling device 2 as a pair of left and right traveling means and a pair extending substantially parallel to the upper portion of the traveling device 2. And the main body frame 3. Reference numeral 4 denotes a track frame of the traveling device 2, and the track frame 4 is connected to the lower portion of the main body frame 3. 5 and 6 are driven wheels (idlers) and driving wheels provided at both ends of the track frame 4, 7 is a crawler belt (endless track crawler) wound around the driven wheels 5 and the driving wheels 6, and 8 is a driving wheel 6. It is a directly connected drive device. Reference numerals 9a and 9b denote a plurality of support posts erected on the main body frame 3. The support posts 9a and 9b support the support frames 10 and 11, respectively.

  Reference numeral 12 denotes a hopper for receiving earth and sand to be reformed, and this hopper 12 is formed in a substantially frame shape having an open top and bottom, and is supported by the support frame 10 on one side in the longitudinal direction of the main body frame 3 (FIGS. 1 and 2 on the left side). In addition, the earth and sand to be reformed are often introduced by a loading heavy machine such as a hydraulic excavator, for example, and the hopper 12 is formed in an expanded shape toward the upper side in consideration of the convenience of loading the earth and sand. ing.

FIG. 4 is a side sectional view schematically showing the structure of the hopper 12.
In FIG. 4, 12 </ b> A is a sediment outlet cut out at the lower end of the wall surface downstream of the hopper 12 in the sediment transport direction (right side in FIG. 4) by the transport conveyor 13, which will be described later. Opposite to the belt 16 (described later), it is formed to have a predetermined width (a width slightly narrower than the conveyor belt 16) and a predetermined height. 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 bracket fixed above the earth and sand outlet 12 </ b> A of the hopper 12, and 20 is a swing roller supported so as to be rotatable (swingable) via a pin 21 with respect to the bracket 19. The swing roller 20 includes an arm 20A connected to the bracket 19 and a pressure roller 20B rotatably provided at the tip of the arm 20A. That is, the pressure roller 20B rotates following the surface of the transporting earth and sand while moving up and down following the unevenness of the surface of the transporting earth and sand on the transporting belt 16 cut out from the sand and sand outlet 12A. As a result, the earth and sand that has passed through the pressure roller 20B are pressed with a predetermined force by the weight of the pressure roller 20B, and the bulk density is substantially constant.

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

  Returning to FIG. 1 to FIG. 3, reference numeral 13 denotes a transfer conveyor for transferring the earth and sand received by the hopper 12, and the transfer conveyor 13 is formed from the lower side of the hopper 12 into an inlet cylinder 49 (described in FIGS. 5 and 5) of a mixing device 47 described later. 6) It extends substantially horizontally over the top. Reference numeral 14 denotes a conveyor frame of the conveyor 13, and the conveyor frame 14 is supported by the support posts 9a and 9b. Reference numerals 15A and 15B denote driving wheels and driven wheels provided at both ends of the conveyor frame 14, reference numeral 16 denotes a conveyor belt wound around the driving wheels 15A and driven wheels 15B, and reference numeral 17 denotes a plurality of belts that support the conveying surface of the conveyor belt 16. It is a support roller. A driving device 18 (for example, a hydraulic motor; see FIG. 7 described later) is connected to the driving wheel 15A to circulate and drive the conveyor belt 16 by rotationally driving the driving wheel 15A. The conveyor 13 is provided with a rotation speed sensor 25 (see FIG. 7 to be described later) for detecting the rotation speed of the drive wheel 15A that is driven to rotate by the drive device 18. The rotation speed sensor 25 detects the rotation speed sensor 25. The result is output to the conveyance speed calculation circuit 77 as needed (see FIG. 7 described later). Reference numeral 27 denotes a soil improvement material supply device for adding a soil improvement material to the earth and sand transported by the transport conveyor 13. This soil improvement material supply device 27 includes a storage tank 28 for a soil improvement material having a substantially square horizontal section, and a storage tank 28 for the storage. The screw feeder 29 that guides the soil quality improving material in the tank 28 downward, and a substantially square pyramid-shaped chute 30 that serves as a funnel for guiding the soil quality improving material in the storage tank 28 to the screw feeder 29. . In addition, the storage tank 28 includes a bellows portion 32 provided continuously to a flange-shaped frame plate 31 above the chute 30 and a top plate portion 33 that covers the top of the bellows portion 32. Reference numeral 35 denotes an opening / closing lid for the soil improvement material filling opening provided at substantially the center of the top plate portion 33. The open / close lid 35 is attached to the top plate portion 33 via a hinge 36 (see FIG. 2). Yes.

  Reference numeral 37 denotes a plurality of mounting portions (four in this example) provided on the outer peripheral portion of the top plate portion 33, and 38 denotes a column fixedly suspended below the mounting portion 37. A pin hole 39 (only the upper one is shown in FIG. 1) is formed 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 cylinder 41 supports the frame plate 31 of the chute 30 described above. is doing. A pin hole (not shown) is formed near the tip of the guide tube 41. In other words, each of the support columns 38 is inserted into the guide cylinder 41 so as to be slidable in the vertical direction, and can protrude to the lower side of the base plate 40. By extending and contracting, the height of the storage tank 28 is variable.

  Reference numeral 42 denotes a stopper pin for fixing the support column 38 to the guide cylinder 41. The stopper pin 42 is inserted into a pin hole 39 of the support column 38 through a pin hole (not shown) of the guide cylinder 41. That is, for example, during operation, the bellows portion 32 is extended, and the stopper pin 42 is inserted into the pin hole 39 on the lower side of the column 38 through the pin hole of the guide cylinder 41, as shown in FIG. In addition, a sufficient internal volume of the storage tank 28 is secured. On the other hand, when the self-propelled soil improvement machine is transported by a trailer or the like, the bellows portion 32 is limited, and the stopper pin 42 is inserted into the pin hole 39 on the upper side of the column 38 through the pin hole of the guide cylinder 41. As a result, the total height of the self-propelled soil improvement machine can be held in a state where it is lowered to a height that clears the transport restrictions.

  43 is a casing of the screw feeder 29. The casing 43 is formed in a substantially cylindrical shape and includes a screw (not shown) therein. This screw is rotationally driven by a drive device 44 (see FIG. 7 described later), so that the screw feeder 29 transfers the soil improvement material introduced into the casing 43 from the previous chute 30 to the left side in FIG. It has become. And the earth and sand conveyed by the conveyance direction downstream side (right side in FIG. 1) edge part of the conveyance conveyor 13 from the exit of the soil improvement material which is not shown in figure provided in the longitudinal direction one side (left side in FIG. 1) lower part of the casing 43 On the other hand, the soil improvement material is added in a certain amount. The screw is driven by a drive device 44 within a predetermined rotation speed range unique to the device, and the screw feeder is within a supply amount range corresponding to the rotation speed range (in other words, within a supply capacity range). No. 29 is designed to supply soil quality improving material. Further, as shown in FIG. 1, the screw feeder 29 is arranged such that the upstream side in the transfer direction (right side in FIG. 1) is lower than the downstream side in the transfer direction (left side in FIG. 1). Therefore, consideration is given to reducing the height of the soil conditioner supply device 27.

  45 is a crane provided on one side (upper side in FIG. 2, left side in FIG. 3) of the self-propelled soil improvement machine. This crane 45 is a main body on one side of the self-propelled soil improvement machine (left side in FIG. 3). It is provided on a support base 46 attached to the frame 3. Further, the crane 45 includes a support portion 45A erected upward from the support base 46, an arm 45B pivotally connected to the support portion 45A, the base end of which is pivotally connected to extend and contract in the longitudinal direction, A cylinder 45C that moves the arm 45B up and down and a winch 45D provided at the tip of the arm 45B are provided. Normally, when filling the storage tank 28 with the soil improvement material, the upper opening / closing lid 35 is opened, and the flexible container is lifted by the crane 45 and inserted into the soil improvement material receiving port.

  At this time, although not shown in particular for preventing congestion, the top plate portion 33 is provided with a cutter having a tip directed upward at a position substantially directly below the soil conditioner receiving port of the storage tank 28. As a result, the flexible container inserted into the soil conditioner receiving port by the crane 45 is pressed against the cutter by its own weight, and the bottom is torn, and the soil conditioner flows out into the storage tank 28 from here. .

Reference numeral 47 denotes a mixing device (mixing means) that mixes the earth and sand introduced from the conveyor 13 and the soil quality improving material to generate improved soil. FIG. 5 is a top view showing the overall 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. The mixing device main body 48 has an improvement in soil and soil quality on the upper side in one longitudinal direction (left side in FIGS. 5 and 6). An inlet cylinder 49 for the material is provided, and an outlet cylinder 50 for the improved soil is provided at the lower part on the other side (right side in FIG. 6).

  Reference numeral 51 denotes a plurality (two in this example) of paddle mixers provided in the mixing device main body 48. The paddle mixers 51 are arranged substantially parallel to the longitudinal direction of the mixing device main body 48 (left and right directions in FIGS. 5 and 6). The hollow rotating shaft 52 (which may be solid) and a plurality of paddles 53 provided radially on the rotating shaft 52 are configured. The paddle 53 has a smooth surface inclined at a predetermined angle with respect to the axial direction of the rotation shaft 52 (in this case, the right direction in FIGS. 5 and 6) so as to face the rotation direction of the paddle mixer 51. The earth and sand introduced from the inlet cylinder 49 can be transferred toward the outlet cylinder 50 while being mixed.

  54 is a bearing that rotatably supports both ends of the rotating shaft 52 of the paddle mixer 51, 55 is a timing gear provided at the other end (right end in FIG. 6) of the rotating shaft 52, and 56 is a driving device for the paddle mixer 51. The output shaft 56 a of the driving device 56 is directly connected to the other end of the rotating shaft 52. Further, the timing gears 55, 55 provided on the adjacent rotating shafts 52, 52 mesh with each other, so that the adjacent paddle mixers 51, 51 are driven to rotate in opposite directions at substantially the same rotational speed. ing.

  With such a structure, the mixing device 47 mixes the earth and sand introduced from the transport conveyor 13 through the inlet cylinder 49 with the paddle mixer 51 (strictly, the paddle 53) to make an improved soil. It moves to the side and is led out from the outlet cylinder 50 downward.

  Returning to FIG. 1 to FIG. 3, 59 is a discharge conveyor for discharging the improved soil led out from the mixing device 47 to the outside of the machine. In this case, after extending a predetermined distance substantially horizontally toward the right side in FIG. 1, it extends upward from the lower side 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 is supported by a power device 68, a main body frame 3, and the like which will be described later via support members 61 and 62 and the like. Reference numeral 63 denotes a drive wheel provided at the end of the discharge conveyor 59 on the downstream side in the conveyance direction (right side in FIG. 1), and reference numeral 64 denotes a driven wheel provided on the upstream side in the conveyance direction of the discharge conveyor 59 (left side in FIG. 1). , 65 is a conveyor belt wound around the drive wheel 63 and the driven wheel 64. 66 is a plurality of support rollers for supporting the conveying surface of the conveyor belt 65, and 67 is a driving device (see FIG. 2) directly connected to the driving wheel 63. The driving device 67 rotates the driving wheel 63 to rotate the conveyor belt. 65 is circulated and driven.

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

  Reference numeral 70 denotes a driver's seat provided in a compartment on the front side (the left side in FIGS. 1 and 2) of the power device 68. The driver's seat 70 has a pair of operating levers for operating the driving device 8 of the traveling device 2. 71 is provided. Further, an operation panel 72 (see FIG. 1) for operating drive devices of other devices such as the drive device 56 of the mixing device 47 is provided below the driver seat 70.

  At this time, in the present embodiment, for example, the mixing ratio control device 75 provided on the operation panel 72 controls the supply amount of the soil improvement material supply device 27 according to the amount of earth and sand transported by the transport conveyor 13. It has become. FIG. 7 is a functional block diagram showing functions of the mixing ratio control device 75.

  In FIG. 7, reference numeral 76 denotes a sediment volume detector that measures the volume of sediment transported by the conveyor 13. The sediment volume detector 76 detects a rotational speed of the transport conveyor drive wheel 15 </ b> A. 25, a transport speed calculation circuit 77 for calculating the drive speed of the transport belt 16 of the transport conveyor 13 (that is, earth and sand transport speed) from the rotational speed of the drive wheels input from 25, The width of the transported sediment stored in the ratio control device 75 (or may be set and input by an appropriate external terminal such as the operation panel 72) (that is, the width of the sediment outlet 12A (see FIG. 4)), And the earth and sand volume calculating circuit 24 for calculating the volume of the earth and sand from the height of the earth and sand inputted from the height detecting means 22. That is, since the transport sediment is cut out from the hopper 12 by the width of the sediment exit 12A, the sediment volume calculation circuit 24 multiplies the transport sediment height and the calculated transport speed by the width of the transport sediment. The earth and sand volume transported per unit time by the transport conveyor 13 is calculated.

  Reference numeral 80 denotes a rotation speed sensor of the drive device 44 of the screw feeder 29. The rotation speed sensor 80 outputs the detection result to the feeder control unit 81 as needed. The feeder control unit 81 calculates the amount of soil improvement material actually supplied based on the rotation speed of the screw feeder driving device 44 input by the soil quality improvement material supply amount calculation circuit 82 of the feeder control unit 81. It is supposed to be. Reference numeral 83 denotes a mixing ratio setting circuit for taking in the mixing ratio of the earth and sand and the soil quality improving material set and input on the operation panel 72 or the like. The feeder control unit 81 is a soil quality improvement material requirement calculation circuit that calculates the required amount of soil quality improvement material to be supplied with respect to the input amount of conveyed soil.

  Reference numeral 85 denotes a comparison circuit that compares the calculation results of the soil improvement material requirement calculation circuit 84 and the soil improvement material supply amount calculation circuit 82. The comparison circuit 85 determines whether the actual soil conditioner supply amount is excessive or insufficient on the basis of the input request amount, and drives the drive device 44 of the screw feeder 29 so that the soil conditioner supply amount approximates the request amount. The control signal for controlling the number of revolutions is calculated and output, and is similarly provided in the feeder controller 81.

  With such a configuration, the feeder control unit 81 controls the supply amount of the soil improvement material by the screw feeder 29 in accordance with the detection (calculation) value of the sediment volume detection unit 76. Thereby, it becomes possible to approximate the mixing ratio of the actual earth and sand and the soil improving material to a preset mixing ratio, and it is possible to generate high quality improved soil.

  In the self-propelled soil improvement machine configured as described above, the greatest feature of the present embodiment is that the soil improvement material requirement calculated by the soil improvement material requirement calculation circuit 84 and the supply capacity of the screw feeder 29 are as follows. And the transport speed of the transport conveyor 13 is controlled. The details will be described below.

  As shown in FIG. 7, the mixing ratio control device 75 further includes a transport conveyor control unit 90, and the transport conveyor control unit 90 supplies the unit of the screw feeder 29 that is set and input on the operation panel 72 or the like, for example. Feeder unit supply amount setting circuit 91 for taking in the amount (determined from machine dimensions and the like), the input result of this feeder unit supply amount setting circuit 91, and the soil quality calculated by the soil improvement material requirement amount calculation circuit 84 A drive speed calculation circuit 92 that calculates the drive speed of the screw feeder 29 (that is, the number of rotations of the screw) from the required amount of the improved material, and a driveable speed range of the screw feeder 29 that is set and input by the operation panel 72 or the like (ie, the machine A feeder driveable speed range setting circuit 93 for taking in the screw rotation speed range determined from the capacity of the feeder, and the feeder The input result of the movable speed range setting circuit 93 is compared with the drive speed calculated by the drive speed calculation circuit 92. When the calculated drive speed is outside the input driveable speed range, A comparison circuit 94 is provided that calculates and outputs a control signal for controlling the rotational speed to the drive device 18.

  In the above, the height detection means 22 and the rotation speed sensor 25 constitute earth and sand amount detection means for detecting the amount of earth and sand conveyed by the conveyor according to the claims and the volume of the earth and sand conveyed by the conveyor. The earth and sand volume detecting means for measuring is also constituted, and the mixing ratio control device 75 constitutes the control means.

Next, operation | movement of one Embodiment of the self-propelled soil improvement machine of this invention of the said structure is demonstrated below.
First, before starting the work, the operator sets and inputs the optimum mixing ratio of the soil and the soil quality improving material in advance from the operation panel 72 or the like in consideration of the properties of the soil to be reformed. This input result is taken in by the mixture ratio setting circuit 83.

  Thereafter, for example, when the sand to be reformed 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 transport conveyor 13 below, and pushed out and transported from the sand and sand outlet 12A. The This conveyed earth and sand is pressurized by the pressure roller 20B, and the bulk density is made constant. The height of the pressure roller 20B at this time is detected by the height detection means 22, and the detection result is input to the earth and sand volume calculation circuit 24. On the other hand, the rotational speed sensor 25 detects the rotational speed of the drive wheels 15 </ b> A of the transport conveyor 13 at this time, and inputs the detection result to the transport speed calculation circuit 77. The transport speed calculation circuit 77 calculates the transport speed of the earth and sand from the input rotational speed of the drive wheel 15A, and the sediment volume calculation circuit 24 calculates the calculated transport speed and the height of the sand and sand input from the height detection means 22. The amount of sediment transported per unit time is calculated from the previously stored sediment transport width.

  Next, the soil quality improvement material requirement amount calculation circuit 84 is initially set and inputted by the operator to the amount of transported soil calculated by the sediment volume calculation circuit 24 and is taken in by the mixture ratio setting circuit 83 (more precisely, the soil quality) Multiply the improvement material addition rate) to calculate the required soil quality improvement material supply. The soil quality improvement material supply amount calculation circuit 82 inputs the rotation speed of the screw feeder 29 from the rotation speed sensor 80 and calculates the actual soil quality improvement material supply volume. The comparison circuit 85 compares the actual soil improvement material supply amount with the soil improvement material requirement amount calculated by the soil improvement material requirement amount calculation circuit 84, and the actual soil improvement material supply amount approximates the soil improvement material requirement amount. Thus, the drive device 44 of the screw feeder 29 is controlled.

  Under such control of the mixing ratio control device 75, the soil improvement material supply device 27 supplies the soil improvement material in the storage tank 28 to the screw feeder 29 so that the mixing ratio of the soil and the soil improvement material is set and inputted. Is supplied to the earth and sand transported by the transport conveyor 13 by a fixed amount. And the earth and sand introduced to the mixing device 47 by the transport conveyor 13 and the soil quality improving material are uniformly stirred and mixed by the paddle mixer 51, and are led out on the discharge conveyor 59 as improved soil. The improved soil is conveyed by a discharge conveyor 59 and finally discharged outside the self-propelled soil improvement machine.

  In the soil quality improvement work performed as described above, for example, when the soil quality improvement work is being performed while supplying the soil quality improvement material near the upper limit of the supply capacity of the screw feeder 29, the conveyor conveys due to a change in the properties of the raw material soil and the like. The operation when the amount of earth and sand transported at 13 increases and the amount of soil improvement material demand calculated by the soil quality improvement material demand computation circuit 84 exceeds the upper limit of the supply capacity of the screw feeder 29 is shown in FIG. It explains using.

FIG. 8 is a flowchart showing the control contents related to the transport speed control of the transport conveyor 13 among the functions of the mixing ratio control device 75.
In FIG. 8, first, at step 10, the mixing ratio control device 75 calculates the amount of transported sediment per unit time of the transport conveyor 13 by the sediment volume calculation circuit 24, and proceeds to the next step 20.

  In step 20, the required amount of soil improvement material is calculated by multiplying the amount of transported soil calculated in step 10 by the soil improvement material requirement amount calculation circuit 84 by the mixing ratio (addition rate of soil improvement material) taken in by the mixing ratio setting circuit 83. Calculate and go to the next step 30.

  In step 30, the required speed of the soil improvement material calculated in step 20 by the drive speed calculation circuit 92 is divided by the unit supply amount of the screw feeder 29 taken in by the feeder unit supply amount setting circuit 91, thereby driving the screw feeder 29. (Rotation speed) is calculated, and the next step 40 is performed.

  In step 40, the drive speed (rotation speed) of the screw feeder 29 calculated in step 30 by the comparison circuit 94 is within the driveable speed range (rotation speed range) of the screw feeder 29 taken in by the feeder driveable speed range setting circuit 93. It is determined whether or not. If it is within the range, the determination is satisfied and the routine returns to Step 10 and Steps 10 to 40 are repeated. If it is out of range, the determination is not satisfied and the routine goes to the next step 50.

  In step 50, it is determined whether or not the driving speed (rotation speed) of the screw feeder 29 calculated in step 30 is higher than the upper limit value of the drivable speed range (rotation speed range) of the screw feeder 29. If it is above, the determination is satisfied and the routine goes to the next step 60.

  In step 60, the comparison circuit 94 calculates and outputs a control signal for reducing the rotation speed to the driving device 18 of the conveyor 13. Specifically, the comparison circuit 94 closes the control valve to a control valve (not shown) that controls the flow of pressure oil supplied from the hydraulic pump (not shown) to the driving device 18 (hydraulic motor). A control signal is output to operate in the direction. As a result, the pressure oil supplied to the driving device 18 is reduced and the number of rotations thereof is reduced, the conveyance speed of the conveyance conveyor 13 is reduced, and the amount of conveyance soil is reduced. Thereafter, the process returns to Step 10 and Steps 10 to 60 are repeated. When the amount of conveyed earth and sand gradually decreases and the driving speed of the screw feeder 29 calculated in step 30 falls within the drivable speed range, the determination in step 40 is satisfied and the process returns from step 40 to step 10, and steps 10 to 10. Step 40 is repeated.

  On the other hand, for example, when the soil improvement work is being performed while supplying the soil improvement material near the lower limit of the supply capacity of the screw feeder 29, the amount of sediment transported by the transport conveyor 13 is reduced due to a change in the properties of the raw material soil. The operation when the required amount of soil improvement material calculated by the soil improvement material requirement amount calculation circuit 84 falls below the lower limit of the supply capacity of the screw feeder 29 is as follows.

  That is, in the previous step 50, when the drive speed (rotation speed) of the screw feeder 29 calculated in step 30 is lower than the lower limit value of the driveable speed range (rotation speed range) of the screw feeder 29, step The determination of 50 is not satisfied, and the routine goes to the next step 70.

  In step 70, the comparison circuit 94 calculates and outputs a control signal for increasing the rotational speed to the driving device 18 of the conveyor 13. Specifically, the comparison circuit 94 opens a control valve for a control valve (not shown) that controls the flow of pressure oil supplied from a hydraulic pump (not shown) to the drive device 18 (hydraulic motor). A control signal is output so as to operate in the direction. Thereby, the pressure oil supplied to the drive device 18 increases, the rotation speed rises, the conveyance speed of the conveyance conveyor 13 increases, and conveyance sand volume increases. Thereafter, the process returns to Step 10 and Steps 10 to 50 → Step 70 are repeated. When the amount of conveyed earth and sand gradually increases and the driving speed of the screw feeder 29 calculated in step 30 falls within the drivable speed range, the determination in step 40 is satisfied, and the process returns from step 40 to step 10, and from step 10 to step 10. Repeat 40.

According to one embodiment of the self-propelled soil improvement machine of the present invention that performs the operation as described above, the following operations are obtained.
In general, the screw of the screw feeder 29 is driven by a drive device 44 within a predetermined rotation speed range specific to the device, and within a supply amount range corresponding to the rotation speed range (that is, within a supply capacity range). Soil improvement material is supplied in the area.

  At this time, in a self-propelled soil improvement machine such as the above-described prior art (Japanese Patent Laid-Open No. 2003-96818), for example, when it is desired to increase the amount of soil improvement work due to changes in the properties of the material soil and the like. Although the supply amount of soil improvement material is increased in accordance with the supply amount of earth and sand, if the screw feeder 29 is supplying soil improvement material near the upper limit of the supply capacity, it is calculated by the soil improvement material requirement calculation circuit 84. Therefore, the required amount of soil improvement material exceeds the supply capacity of the screw feeder 29. In this case, the supply amount of the soil quality improving material is relatively small with respect to the transported sand and sand, and there is a possibility that the quality of the final improved soil is deteriorated. On the other hand, for example, when it is desired to reduce the amount of soil improvement work, if the soil improvement material is supplied near the lower limit of the supply capacity of the screw feeder 29, the required amount of soil improvement material is the supply capacity of the screw feeder 29. Will fall below the lower limit. In this case, the supply amount of the soil quality improving material is relatively large with respect to the transported sand and sand, and this may also cause a deterioration in the quality of the final improved soil.

  On the other hand, in the present embodiment, as described above, the amount of soil improvement material supplied by increasing the amount of earth and sand transported by the transport conveyor 13 exceeds the upper limit value of the supply capacity range of the screw feeder 29. In this case, the comparison circuit 94 of the transport conveyor control unit 90 reduces the transport speed of the transport conveyor 13 to reduce the transport earth and sand amount, and the required amount of soil and sand transported by the transport conveyor 13 is reduced. When the amount falls below the lower limit of the supply capability of the screw feeder 29, the comparison circuit 94 increases the conveyance speed of the conveyance conveyor 13 to increase the conveyance soil amount. In this way, since the required amount of soil improvement material calculated by the soil quality improvement material required amount calculation circuit 84 can be surely kept within the supply capacity range of the screw feeder 29, the soil and soil improvement material The mixing ratio can be reliably kept constant. As a result, deterioration of the quality of the improved soil can be prevented.

  In the above embodiment of the present invention, when the required amount of soil improvement material becomes out of the supply capacity of the screw feeder 29 due to the increase / decrease in the amount of transport soil, the amount of transport soil by the transport conveyor 13 is gradually increased. Although feedback is performed while increasing / decreasing, the control for calculating the required amount of soil improvement material at that time and comparing it with the supply capacity is performed, but this is not restrictive. That is, for example, the amount of earth and sand conveyed by the conveyor 13 may be increased or decreased stepwise, such as twice or ½ times. In this case, a threshold value of the required amount of soil improvement material for returning the conveyor 13 to normal driving may be provided separately.

  Further, in the embodiment of the present invention, the amount of transport earth and sand transported by the transport conveyor 13 is detected by measuring the volume thereof, but the present invention is not limited to this. (Not shown) may be provided to detect the amount of transported sand and sand, and the amount of transported soil may be detected, or a conveyor scale (not shown) may be provided on the discharge conveyor 59 to measure the weight of the improved soil. By doing so, you may make it detect the amount of conveyance earth and sand. At this time, each of these conveyor scales includes a soil weight detecting means for measuring the weight of the earth and sand conveyed by the conveyor according to claim 4 and an improved soil weight detecting means for measuring the weight of the improved soil discharged by the discharge conveyor. Constitute.

  Furthermore, in the above-described embodiment of the present invention, the present invention is applied to a self-propelled soil conditioner equipped with a screw feeder 29 as a soil conditioner supply device. The present invention may also be applied to a self-propelled soil conditioner equipped with a rotary feeder that supplies a soil conditioner introduced between partition plates by rotating a rotor provided with. In this case, the same effect as that of the present invention can be obtained.

It is a side view showing the whole structure of one embodiment of the self-propelled soil improvement machine of the present invention. It is a top view showing the whole structure of one embodiment of the self-propelled soil improvement machine of the present invention. It is a front view showing the whole structure of one embodiment of the self-propelled soil improvement machine of the present invention. It is a sectional side view showing simply the structure of the hopper which constitutes one embodiment of the self-propelled soil improvement machine of the present invention. It is a top view showing the whole structure of the mixing apparatus which comprises one embodiment of the self-propelled soil improvement machine of the present invention. It is a sectional side view by the VI-VI cross section in FIG. 5 showing the internal structure of the mixing apparatus which comprises one Embodiment of the self-propelled soil improvement machine of this invention. It is a functional block diagram showing the function of the mixing ratio control apparatus which comprises one embodiment of the self-propelled soil improvement machine of the present invention. It is a flowchart showing the control content regarding the conveyance speed control of a conveyance conveyor among the functions of the mixing ratio control apparatus which comprises one Embodiment of the self-propelled soil improvement machine of this invention.

Explanation of symbols

2 Traveling devices (traveling means)
3 Main body frame 12 Hopper 13 Conveyor 22 Height detection means (sediment volume detection means; sediment volume detection means)
25 Rotational speed sensor (Sediment volume detection means; Sediment volume detection means)
27 Soil improvement material supply device 47 Mixing device (mixing means)
59 Discharge conveyor 75 Mixing ratio control device (control means)

Claims (4)

In a self-propelled soil improvement machine that mixes and reforms the received earth and sand with a soil improvement material,
Body frame,
Traveling means provided on the main body frame;
Mixing means provided on the body frame;
A hopper for receiving earth and sand provided on one side in the longitudinal direction of the main body frame;
A conveyor that is provided from the lower part of the hopper to the mixing means and conveys the earth and sand received by the hopper to the mixing means;
A soil improvement material supply device for supplying a soil quality improvement material to the earth and sand transported by this conveyor;
Earth and sand amount detecting means for detecting the amount of earth and sand transported by the transport conveyor;
Based on the detected value of the soil amount detection means, the required amount of soil improvement material is calculated, and the supply amount of the soil improvement material supply device is controlled according to the calculated required amount of soil improvement material, and the calculated soil improvement A control means for controlling the conveyance speed of the conveyance conveyor by comparing the material requirement amount and the supply capacity of the soil improvement material supply device;
A self-propelled soil that includes a discharge conveyor that extends from the lower side of the mixing unit to the other side in the longitudinal direction of the main body frame and discharges the improved soil generated by the mixing unit to the outside of the machine. Improved machine.   2. The self-propelled soil improvement machine according to claim 1, wherein when the calculated soil improvement material requirement amount is larger than an upper limit value of a supply capacity range of the soil improvement material supply device, the control means A self-propelled soil conditioner that reduces the transport speed.   The self-propelled soil improvement machine according to claim 2, wherein the control means is configured to control the transport conveyor when the calculated soil improvement material requirement amount is smaller than a lower limit value of a supply capacity range of the soil improvement material supply device. A self-propelled soil improvement machine characterized by increasing the conveyance speed. The self-propelled soil improvement machine according to any one of claims 1 to 3, wherein the earth and sand amount detecting means is a earth and sand volume detecting means for measuring a volume of earth and sand conveyed by the conveyor, and is conveyed by the conveyor. Self-propelled soil quality having at least one of earth and sand weight detecting means for measuring the weight of the earth and sand to be measured and improved earth weight detecting means for measuring the weight of the improved soil discharged by the discharge conveyor Improved machine.

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