WO2024154399A1 - Soil feeding apparatus - Google Patents

Abstract

In order to minimize a sudden load from being exerted on a rotary drive unit that rotates rolls in a soil feeding apparatus, this soil feeding apparatus comprises: a housing which receives soil fed from above; a first roll and a second roll that are provided at a prescribed interval in the housing and that are rotated by a rotary drive unit to discharge the received soil downward; and a first changing unit that, according to the load exerted by the received soil on the rotary drive unit, makes a change to increase the prescribed interval between the first roll and the second roll.

Description

Sand supply device

The present invention relates to a soil supplying device.

A rotary crusher is known that crushes lumps contained in the soil to be treated into fine particles before mixing the soil to be treated with land improvement materials in the mixing device and then supplies the soil to the mixing device (see, for example, Patent Document 1, etc.).

This rotary crusher has a pair of crushing rolls with crushing teeth on the circumference, and a scraper. The crushing rolls are rotated in forward and reverse directions to crush lumps in the soil being treated that are poured in from above into fine particles.

JP 2005-238079 A

In the above Patent Document 1, when a foreign object that cannot be crushed becomes caught between the crushing teeth of both crushing rolls, both crushing rolls rotate outward toward each other. However, the crushing rolls are subjected to too much load before they start to rotate in the opposite direction, which may damage the crushing rolls or their bearings.

The present invention aims to provide a soil supplying device that can prevent sudden loads from being placed on the rotary drive unit that rotates the rolls.

The soil supplying device of the present invention comprises a housing that receives soil from above, a first roll and a second roll that are provided at a predetermined distance within the housing and rotated by a rotary drive unit to send the received soil downward, and a first change unit that changes the predetermined distance between the first roll and the second roll to increase it according to the load on the rotary drive unit caused by the received soil.

The soil supplying device of the present invention can prevent sudden loads from being placed on the rotary drive unit that rotates the roll.

FIG. 1 is a side view of a self-propelled rotary crushing mixer. FIG. 2(a) is a diagram showing the soil supplying device as viewed from the side (−Y direction), and FIG. 2(b) is a diagram showing the soil supplying device as viewed from above (+Z direction). 3A is a cross-sectional view taken along line AA in FIG. 2A, and FIG. 3B is a cross-sectional view taken along line BB in FIG. 2A. FIG. 4A is an enlarged view of the holding mechanism 16 of FIG. 3A, and FIG. 4B is a view showing a state in which a load is applied to the crushing roll. FIG. 5 is a diagram showing a state in which the shaft holding portion of the second shaft holder has been moved in the +Y direction from the state shown in FIG. FIG. 6 is an enlarged view of the holding mechanism 17 shown in FIG. FIG. 7 is a diagram for explaining the function of the sprocket 21. 8(a) is a perspective view showing the vicinity of sprocket 21 as viewed from the -X direction, and FIG. 8(b) is a view showing the vicinity of sprocket 21 in FIG. 8(a) as viewed from the direction of arrow J. FIG. 9 is a block diagram showing a control system of the soil supplying device. 10(a) to 10(d) are schematic diagrams showing the crushing roll as viewed from the +X direction. FIG. 11 is a graph showing how the load changes when a foreign object is caught between the crushing rolls in the case where a disc spring is provided as in this embodiment and in the case where a disc spring is not provided (comparative example). FIG. 12 is a diagram for explaining a method for removing foreign matter after the motor is stopped. FIG. 13 is a diagram showing a modified example.

Below, one embodiment will be described in detail with reference to Figs. 1 to 12. Fig. 1 shows a side view of a self-propelled rotary crushing mixer 100 having a soil supplying device 10. In the following description, the left-right direction on the paper of Fig. 1 is the X-axis direction (the arrow direction is the +X direction), the direction perpendicular to the paper is the Y-axis direction (the direction into the paper is the +Y direction), and the up-down direction on the paper is the Z-axis direction (the arrow direction is the +Z direction).

As shown in FIG. 1, the self-propelled rotary crushing mixer 100 includes a soil/sand supplying device 10, a powder supplying device 20, a mixer 30, a first transport conveyor 41, a second transport conveyor 42, and a traveling device 50.

The soil supplying device 10, the powder supplying device 20, the mixing device 30, the first transport conveyor 41, and the second transport conveyor 42 are supported by a support base 52, and a traveling device 50 is provided below the support base 52. The traveling device 50 is an endless track or the like, and travels around a construction site, work site, etc. in response to remote control operation by a worker, etc.

The soil supplying device 10 crushes lumps contained in the soil (e.g. clay soil) that is poured in from above into fine particles, and then supplies the clay soil onto the first transport conveyor 41. Details of the soil supplying device 10 will be described later.

The powder supplying device 20 is provided on the -X side of the soil supplying device 10. The powder supplying device 20 supplies additives onto the first transport conveyor 41. The additives include lime-based solidification materials such as quicklime and hydrated lime, cement-based solidification materials such as ordinary cement and blast furnace cement, or soil improvement materials made of polymer materials.

The first transport conveyor 41 transports the clay soil supplied from the soil supplying device 10 and the additives supplied from the powder supplying device 20 toward the mixer 30.

The mixer 30 crushes and refines the clay soil, giving the raw soil a gentle particle size distribution. The mixer 30 also mixes the clay soil with additives to produce improved soil, adjusting the properties and strength of the improved soil.

The mixing device 30 includes a fixed drum 31, a rotating drum 32, a rotation mechanism 33, a rotation motor 34, and a belt 35.

The fixed drum 31 is a cylindrical container. Clay soil and additives are fed into the fixed drum 31 from the first transport conveyor 41 via the inlet member 36, and the raw soil and additives are guided into the rotating drum 32 provided below the fixed drum 31 (-Z side).

The rotating drum 32 is a cylindrical container that rotates (spins) around the central axis of the cylinder (around the Z-axis) by a rotating drum drive motor (not shown). A scraping bar (scraper) (not shown) is provided inside the rotating drum 32, extending in the Z-axis direction and with its upper end fixed to the fixed drum 31. The scraping bar (not shown) is in contact with the inner circumferential surface of the rotating drum 32, so that as the rotating drum 32 rotates, clayey soil and the like adhering to the inner circumferential surface of the rotating drum 32 can be scraped off by the scraping bar (not shown).

The rotation mechanism 33 has a rotating shaft that extends vertically (Z-axis direction) and impact members that are provided on the rotating shaft in two stages, one above the other. The rotating shaft is supported as a cantilever, with the lower end of the rotating shaft being a free end. The rotating shaft is connected to a rotary motor 34 via a belt 35, and as the rotating shaft rotates around the Z-axis, the impact members crush and refine the clayey soil, and mix the clayey soil with additives. The rotating direction of the rotating shaft and the rotating drum 32 may be the same or opposite.

The improved soil produced by crushing and mixing in the mixer 30 falls downward from the rotating drum 32 and is supplied onto the second transport conveyor 42. The second transport conveyor 42 transports the improved soil supplied from the mixer 30 to a position away from the mixer 30 and discharges it. The improved soil is used for purposes such as backfilling of structures, backfilling of buildings, backfilling of civil engineering structures, embankments for river embankments, embankments for roads, embankments for land development, railway embankments, airport embankments, and water surface reclamation.

The self-propelled rotary crusher/mixer 100 has a generator (not shown). The generator is used as a power source for each device of the self-propelled rotary crusher/mixer 100.

(Details of the soil supplying device 10)
The soil supplying device 10 will be described in detail below.

FIG. 2(a) shows the soil supplying device 10 as viewed from the side (-Y direction), and FIG. 2(b) shows the soil supplying device 10 as viewed from above (+Z direction). FIG. 3(a) shows a cross-sectional view taken along line A-A in FIG. 2(a), and FIG. 3(b) shows a cross-sectional view taken along line B-B in FIG. 2(a).

As shown in Figures 2(a), 2(b), and 3(a), the soil supplying device 10 includes a hopper 11, a housing 12, a pair of crushing rolls (first and second rolls) 13A and 13B, motors (rotational drive units) 14A and 14B, and chains 15A and 15B.

The hopper 11 receives the clayey soil supplied from above and guides it into the housing 12.

The housing 12 houses a pair of crushing rolls 13A, 13B inside. As shown in Figures 3(a) and 3(b), the housing 12 is hopper-shaped, and discharges clay from a lower opening 12a shown hatched in Figure 2(b).

The pair of crushing rolls 13A, 13B are arranged at a predetermined distance in the Y-axis direction, as shown in FIG. 2(b).

As shown in FIG. 2(b), one of the crushing rolls 13A has a cylindrical shaft portion 132A, a cylindrical main body portion 133A having a larger diameter than the shaft portion 132A, and a plurality of crushing teeth 134A provided on the main body portion 133A. The shaft portion 132A penetrates the housing 12, with one end (the end on the +X side) held by the holding mechanism 16 in FIG. 2(a) and the other end (the end on the -X side) held by the holding mechanism 17. A sprocket 18A is provided near one end (the end on the +X side) of the shaft portion 132A. The plurality of crushing teeth 134A protrude radially from the circumferential surface of the main body portion 133A.

The other crushing roll 13B has the same configuration as the crushing roll 13A. That is, the crushing roll 13B has a shaft portion 132B, a main body portion 133B, and a plurality of crushing teeth 134B. Like the shaft portion 132A, one end (the end on the +X side) of the shaft portion 132B is held by a holding mechanism 16, and the other end (the end on the -X side) is held by a holding mechanism 17. A sprocket 18B (see FIG. 3(a)) is provided near one end (the end on the +X side) of the shaft portion 132B.

As shown in Fig. 3(a) and Fig. 2(a), the motor 14A has a rotating shaft 141A extending in the X-axis direction, and a sprocket 19A is provided on the rotating shaft 141A. A chain 15A is hung between the sprocket 19A and a sprocket 18A provided on the shaft portion 132A of the crushing roll 13A. This allows the rotational force of the motor 14A to be transmitted to the crushing roll 13A.

As shown in FIG. 3(a), the motor 14B has a rotating shaft 141B extending in the X-axis direction, and a sprocket 19B is provided on the rotating shaft 141B. A chain 15B is hung between the sprocket 19B and a sprocket 18B provided on the shaft portion 132B of the crushing roll 13B. This allows the rotational force of the motor 14A to be transmitted to the crushing roll 13A. The chain 15B is also hung on a sprocket 21 that functions as a chain tensioner and is provided near the sprocket 19B.

Fig. 4(a) is an enlarged view of the holding mechanism 16 of Fig. 3(a). As shown in Fig. 4(a), the holding mechanism 16 has a top plate portion 161, a bottom plate portion 162, side plate portions 163A and 163B, and a first shaft holder 65A and a second shaft holder 65B as first modified portions. A frame body is formed by the top plate portion 161, the bottom plate portion 162, and the side plate portions 163A and 163B.

The first shaft holder 65A has a fixed portion 63A as a guide member, a shaft holding portion 61A, and a disc spring 62A as an elastic member.

The fixed portion 63A is the part painted gray on the left side of Figure 4(a) and is fixed to the side plate portion 163A.

The shaft holding part 61A is a member that supports the shaft part 132A of the crushing roll 13A via a bearing, and is arranged to be slidable in the Y-axis direction relative to the fixed part 63A.

The coned disc spring 62A is provided on the fixed portion 63A and constantly applies a force in the +Y direction (see arrow C in Figure 4(a)) to the shaft holding portion 61A. This maintains the shaft holding portion 61A in the state shown in Figure 4(a) until a predetermined or greater load in the -Y direction is applied to the crushing roll 13A. The center-to-center distance between the shaft portions 132A and 132B at this time is H1. On the other hand, when a predetermined or greater load is applied to the crushing roll 13A in the -Y direction, the shaft holding portion 61A is guided by the fixed portion 63A and moves in the -Y direction (arrow D in Figure 4(b)) against the biasing force of the coned disc spring 62A. At this time, the center-to-center distance between the shaft portions 132A and 132B becomes H2 (>H1). Furthermore, when the load in the -Y direction applied to the crushing roll 13A is reduced from the state shown in FIG. 4(b), the biasing force of the disc spring 62A causes the roll to begin to return to the state shown in FIG. 4(a).

As shown in FIG. 4(a), the second shaft holder 65B has a bolt portion 63B, a shaft holding portion 61B, and a nut portion 64B.

The bolt portion 63B is the part painted gray on the right side of Figure 4(a) and has a rod portion 66B with a screw groove formed therein and a plate-shaped disk portion 67B provided at the -Y side end of the rod portion 66B. The rod portion 66B penetrates the side plate portion 163B in the Y-axis direction and is screwed into it. The rod portion 66B also penetrates the disk holding portion 68B (described later) in the Y-axis direction.

The shaft holder 61B is a member that supports the shaft 132B of the crushing roll 13B via a bearing. The shaft holder 61B has a disk holder 68B that holds the disk 67B at the +Y end. The disk holder 68B holds the disk 67B so that it can rotate freely around the Y axis, and holds the disk 67B so that the positional relationship between the shaft holder 61B and the bolt 63B in the Y axis direction does not change.

The nut portion 64B is screwed onto the bolt portion 63B from the +Y side of the side plate portion 163B. When the nut portion 64B is rotated counterclockwise as viewed from the +Y direction to loosen it, the bolt portion 63B is free to rotate around the Y axis. Next, when the +Y side end of the bolt portion 63B is rotated counterclockwise as viewed from the +Y direction, the bolt portion 63B and the shaft holding portion 61B move in the direction of the arrow E in FIG. 5. Also, when the +Y side end of the bolt portion 63B is rotated clockwise as viewed from the +Y direction, the bolt portion 63B and the shaft holding portion 61B move in the opposite direction to the direction of the arrow E in FIG. 5. Next, when the nut portion 64B is rotated clockwise as viewed from the +Y direction to tighten it, the bolt portion 63B is restricted from rotating around the Y axis and the position of the shaft holding portion 61B is fixed. Therefore, by rotating the bolt portion 63B, the center-to-center distance H3 of the shaft portions 132A and 132B shown in FIG. 5 can be changed.

Figure 6 is an enlarged view of the holding mechanism 17 of Figure 3(b). As shown in Figure 6, the holding mechanism 17 has a top plate portion 171, a bottom plate portion 172, side plate portions 173A and 173B, a first shaft holder 75A, and a second shaft holder 75B. A frame is formed by the top plate portion 171, the bottom plate portion 172, and the side plate portions 173A and 173B.

The first shaft holder 75A has a fixed portion 73A as a guide member, a shaft holding portion 71A, and a disc spring 72A as an elastic member. The functions of each portion of the first shaft holder 75A are the same as those of the first shaft holder 65A described above.

The second shaft holder 75B has a bolt portion 73B, a shaft holding portion 71B, and a nut portion 74B. The functions of the respective portions of the second shaft holder 75B are the same as those of the second shaft holder 65B described above. As described above, when moving the shaft holding portion 61B of the second shaft holder 65B in the Y-axis direction, the shaft holding portion 71B of the second shaft holder 75B must also be moved in the Y-axis direction the same distance as the shaft holding portion 61B. The nut portion 74B of the second shaft holder 75B and the thread groove of the bolt portion 73B may be omitted so that the shaft holding portion 71B of the second shaft holder 75B moves in the Y-axis direction the same distance as the shaft holding portion 61B in conjunction with the movement of the shaft holding portion 61B of the second shaft holder 65B in the Y-axis direction.

Here, if the distance between the pair of crushing rolls 13A, 13B is widened as shown in FIG. 5, the distance between sprocket 18B and sprocket 19B shown in FIG. 3(a) will become narrower, causing the chain 15B to become loose. To avoid this, in this embodiment, the aforementioned sprocket 21 is provided on the soil supplying device 10. That is, in this embodiment, as shown in FIG. 7, the position of the sprocket 21 is changed from the position shown in FIG. 3(a) so that tension is applied to the chain 15B.

Figure 8(a) shows an oblique view of the area near the sprocket 21 as seen from the -X direction. Figure 8(b) shows the area near the sprocket 21 in Figure 8(a) as seen from the direction of the arrow J.

As shown in FIG. 8(a), the sprocket 21 is attached to a mounting bracket 80 attached to the housing 12 via a slide mechanism 82. As shown in FIG. 8(b), the slide mechanism 82 has a bolt portion 83 that is attached to the mounting bracket 80 in a state that allows it to rotate around its axis, and a nut portion 84 that is screwed into the bolt portion 83.

The bolt portion 83 has a threaded groove. The longitudinal direction of the bolt portion 83 coincides with the longitudinal direction of the long hole 80a formed in the mounting bracket 80. The sprocket 21 is rotatably mounted on the +X side of the nut portion 84. In addition, a cylindrical protrusion 85 that engages with the long hole 80a is provided on the -X side of the nut portion 84. A threaded groove is formed in the protrusion 85, and a fixing nut 86 is screwed onto the protrusion 85 from the -X side of the mounting bracket 80.

When the fixing nut 86 is tightened, the position of the sprocket 21 is fixed. On the other hand, when the fixing nut 86 is loosened, the nut portion 84 (and the sprocket 21) can be moved along the long hole 80a by rotating the bolt portion 83 with an impact driver or the like. In this way, the position of the sprocket 21 can be changed along the long hole 80a, so it is possible to apply tension to the chain 15B no matter where the sprocket 18B is located.

In addition, an electric rotation mechanism may be provided in the bolt portion 83, and the bolt portion 83 may be rotated by the electric rotation mechanism. In this case, the electric rotation mechanism may rotate the bolt portion 83 automatically. For example, the electric rotation mechanism may rotate the bolt portion 83 from a state in which no tension is applied to the chain 15B, and stop the rotation of the bolt portion 83 when tension is applied to the chain 15B (when a force greater than a predetermined value is required to rotate the bolt portion 83).

FIG. 9 shows a block diagram of the control system of the soil supplying device 10. As shown in FIG. 9, the soil supplying device 10 includes a control unit (first control unit, second control unit) 90, an ammeter 92 as a current detection unit, a communication unit 94, and motor drivers 96A and 96B.

The ammeter 92 detects the current value of the motor 14A. The communication unit 94 communicates with an external device (e.g., the mixing device 30), acquires the status of the external device (e.g., the processing volume, etc.), and notifies the control unit 90. Furthermore, when the soil supplying device 10 stops, the communication unit 94 transmits to the external device a change instruction issued from the control unit 90 regarding the processing of the external device. Note that an ammeter different from the ammeter 92 for detecting the current value of the motor 14B may be provided.

The motor drivers 96A and 96B supply current to the motors 14A and 14B under the control of the control unit 90. The control unit 90 controls the motor drivers 96A and 96B based on the current value of the motor 14A detected by the ammeter 92 and the state of the external device acquired by the communication unit 94. For example, the control unit 90 identifies the load of the motor 14A from the detection value of the ammeter 92, and if it is determined that the load is overloaded, it instructs the motor drivers 96A and 96B to stop the motors 14A and 14B. The control unit 90 may also identify the load of the motor 14B from the detection value of an ammeter other than the ammeter 92 that detects the current value of the motor 14B, and if it is determined that the load is overloaded, it may instruct the motor drivers 96A and 96B to stop the motors 14A and 14B. Note that a known inverter, which is a control device formed by integrating the ammeter 92 and the motor driver A, may be used to detect the current value of the motor 14A and supply current, and a known inverter may also be used for the motor 14B. In addition, when the processing volume of the mixer 30 is large, the control unit 90 instructs the motor drivers 96A and 96B to slow down the rotation speed of the crushing rolls 13A and 13B in order to reduce the processing volume of the mixer 30. Conversely, when the processing volume of the mixer 30 is small, the control unit 90 instructs the motor drivers 96A and 96B to increase the rotation speed of the crushing rolls 13A and 13B in order to increase the processing volume of the mixer 30. The control unit 90 can determine whether the processing volume of the mixer 30 is large or small based on the detection value of an ammeter that detects the current value of the rotary motor 34.

(Operation of the soil supplying device 10)
The following is a description of the operation of the soil supplying device 10. Figures 10(a) to 10(d) are schematic diagrams showing the crushing rolls 13A and 13B as viewed from the +X direction.

In this embodiment, in the preparation stage, the nut portion 64B in FIG. 5 and the nut portion 74B in FIG. 6 are rotated to adjust the distance between the crushing rolls 13A, 13B to an appropriate distance. The appropriate distance can be determined based on the properties of the clayey soil, etc. Also, the position of the sprocket 21 is adjusted so that tension is applied to the chain 15B.

In this state, as shown in FIG. 10(a), the motors 14A and 14B are rotated to rotate the crushing rolls 13A and 13B in the direction of the arrows (forward and reverse directions). With the crushing rolls 13A and 13B rotating in this manner, clayey soil is poured in from above. If the poured clayey soil does not contain any foreign matter, the crushing rolls 13A and 13B can send it downward (onto the first transport conveyor 41) while crushing it.

In contrast, as shown in FIG. 10(b), if the clay soil contains foreign matter, the foreign matter may be pinched between the crushing rolls 13A and 13B (crushing teeth 134A and 134B), causing a load to be applied to the crushing rolls 13A and 13B. In this embodiment, even if a load is applied to the crushing rolls 13A and 13B, the crushing roll 13A can move in the -Y direction as shown in FIG. 10(c). This widens the gap between the crushing rolls 13A and 13B, making it easier for the foreign matter to be sent downward. If the foreign matter is sent downward, the load on the crushing roll 13A will be reduced, and the crushing roll 13A will move in the +Y direction (return to its original position) due to the biasing force of the disc springs 62A and 72A.

On the other hand, even if the gap between the crushing rolls 13A, 13B becomes wider, foreign objects may not be sent downward. However, in this embodiment, even in such a case, the action of the disc springs 62A, 72A can reduce damage to mechanical parts related to the crushing rolls 13A, 13B. In this embodiment, the control unit 90 detects the current value of the motor 14A with an ammeter 92, and when the load reaches a predetermined threshold (overload), it issues an instruction to the motor drivers 96A, 96B to stop the supply of current to the motors 14A, 14B.

FIG. 11 is a graph showing how the load changes when a foreign object is caught between the crushing rolls 13A and 13B in the case where the disc springs 62A and 72A are provided as in this embodiment and in the case where the disc springs 62A and 72A are not provided (comparative example).

When the coned disc springs 62A, 72A are not provided (comparative example), as shown in FIG. 11, the load on the crushing rolls 13A, 13B reaches the mechanical component damage load between the detection of an overload and the stopping of the crushing rolls 13A, 13B, and there is a risk of the mechanical components being damaged. On the other hand, in this embodiment, by providing the coned disc springs 62A, 72A, the rising curve of the load on the crushing rolls 13A, 13B can be made more gentle than in the comparative example. As a result, the crushing rolls 13A, 13B can be stopped before the load on the crushing rolls 13A, 13B reaches the mechanical component damage load. In other words, by providing the coned disc springs 62A, 72A, it is possible to extend the life of the mechanical components.

When the motors 14A, 14B stop, the operator can rotate the bolt portion 63B of the second shaft holder 65B as shown in FIG. 12, and move the crushing roll 13B in the +Y direction (the direction of the arrow E) to widen the gap H between the crushing rolls 13A, 13B. This makes it possible to remove the foreign matter that caused the motors 14A, 14B to stop from below, without having to remove the clay that has accumulated on the upper side of the crushing rolls 13A, 13B. An electric rotation mechanism may be provided on the bolt portion 63B, and the bolt portion 63B may be rotated by the electric rotation mechanism.

When motors 14A and 14B stop, control unit 90 outputs instructions to mixer 30 to stop processing or reduce the processing volume via communication unit 94. Control unit 90 also instructs first transport conveyor 41 to stop transport. This makes it possible to prevent the mixer 30 and first transport conveyor 41 from operating unnecessarily when clayey soil is not being supplied from soil supplying device 10. Control unit 90 does not need to issue instructions directly to mixer 30, first transport conveyor 41, etc., and may issue the above-mentioned instructions to a central control unit that controls the entire self-propelled rotary crusher mixer 100.

As described above in detail, according to this embodiment, the soil supplying device 10 includes a housing 12 that receives clay from above, and crushing rolls 13A, 13B that are provided at a predetermined interval within the housing 12 and rotated by motors 14A, 14B to send the received clay downward. The soil supplying device 10 also includes first shaft holders 65A, 75A that change the spacing between the crushing rolls 13A, 13B to increase in accordance with the load of the received clay. This increases the spacing between the crushing rolls 13A, 13B in accordance with the load, thereby preventing the motors 14A, 14B from being subjected to a sudden load (see FIG. 11). In addition, increasing the spacing between the crushing rolls 13A, 13B in accordance with the load increases the likelihood that foreign matter causing the load will be sent downward.

In addition, in this embodiment, the first shaft holders 65A, 75A have disc springs 62A, 72A, which increase the distance between the crushing rolls 13A, 13B and then decrease the distance between the crushing rolls 13A, 13B according to the load on the motor 14A. This allows the distance between the crushing rolls 13A, 13B to be maintained at an appropriate distance (a preset distance) when no load is applied.

In addition, in this embodiment, the first shaft holder 65A (75A) has a shaft holding portion 61A (71A) that holds the crushing roll 13A, a disc spring 62A (72A) that biases the shaft holding portion 61A (71A), and a fixing portion 63A (73A) that guides the shaft holding portion 61A (71A) in the Y-axis direction. This allows the distance between the crushing rolls 13A and 13B in the Y-axis direction to be changed depending on the load.

In addition, this embodiment includes an ammeter 92 that detects the current value of motor 14A, and a control unit 90 that stops the current supply to motors 14A and 14B when the current value of ammeter 92 reaches or exceeds a predetermined value, so that control unit 90 can stop the current supply to motors 14A and 14B at the appropriate timing.

In the above embodiment, the elastic member of the first shaft holder 65A (75A) is a disc spring, but this is not limited to this. The elastic member may be, for example, a compression coil spring, a leaf spring, rubber, or resin. The number of disc springs can be changed as appropriate.

In the above embodiment, the first shaft holder 65A (75A) has an elastic member (the shaft holding portion 61A (71A) moves in response to the load), but instead of or in addition to this, the second shaft holder 65B (75B) may have an elastic member (the shaft holding portion 61B (71B) moves in response to the load).

In the above embodiment, the control unit 90 may detect the interval between the crushing rolls 13A and 13B from a sensor or an image captured by a camera, display the detection result, or adjust the amount of clayey soil to be fed into the soil supplying device 10 based on the detection result. The control unit 90 may also detect the temperature of at least one of the crushing rolls 13A and 13B (for example, the temperature of the bearings provided on the shafts 132A and 132B) using a sensor or the like, display the detection result, or adjust the amount of clayey soil to be fed into the soil supplying device 10 based on the detection result. For example, if the temperature is higher than a predetermined value, the amount of clayey soil fed is reduced and the motors 14A and 14B are rotated at a low speed. In this way, it is possible to inform the operator of the state of the soil supplying device 10 and to perform appropriate control according to the state of the soil supplying device 10.

In addition, when the distance between the crushing rolls 13A and 13B is increased, the control unit 90 may monitor the value of the soil meter provided on the first transport conveyor and adjust the rotation speed of the motors 14A and 14B to adjust the amount of clayey soil supplied from the soil supplying device 10.

In addition, the control unit 90 or the central control unit that controls the entire self-propelled rotary crushing mixer 100 may monitor the wear condition of the inside of the mixer 30 (such as the impact members of the rotation mechanism 33) using images, etc., when the mixer 30 is in a low-speed state or stopped state, and may determine whether or not maintenance is required for the impact members, etc. based on the monitoring results.

In the above embodiment, the two crushing rolls 13A and 13B are rotated by two motors 14A and 14B, but the present invention is not limited to this. For example, the two crushing rolls 13A and 13B may be rotated by one motor. In this case, the configuration shown in FIG. 13 can be used as an example. In the example of FIG. 13, a chain 15C is hung on a main sprocket 19 provided on the rotating shaft of the motor 14 and a sprocket 18A provided on the crushing roll 13A. A sub sprocket 29 is meshed with the main sprocket 19, and a chain 15D is hung on the sub sprocket 29 and a sprocket 18B provided on the crushing roll 13B. In order to prevent interference between the chains 15C and 15D, the sub sprocket 29 may be shifted in the -X direction from the main sprocket 19, and the chain 15C may be provided on the front side (+X side) and the chain 15D may be provided on the rear side (+X side). For ease of illustration, the sprocket that functions as a tensioner has been omitted from Figure 13.

In the above embodiment, the soil fed into the soil supplying device 10 is described as being clayey soil, but other types of soil may also be used.

In the above embodiment, the rotary crushing mixer is described as being self-propelled, but this is not limited to the above. The rotary crushing mixer may be of a stationary type (plant type). In addition, the soil supplying device 10 may be used for purposes other than as a rotary crushing mixer.

The above-described embodiment is a preferred example of the present invention. However, the present invention is not limited to this embodiment, and various modifications are possible without departing from the spirit of the present invention.

10: Soil supply device 12: Housing 14A, 14B: Motor (rotation drive unit)
13A, 13B Crushing rolls (first roll, second roll)
62A, 72A Disc spring (elastic member)
63A, 73A Fixed portion (guide member)
65A, 75A First shaft holder (first modified part)
90 Control unit (first control unit, second control unit)
92 Ammeter (current detection unit)

Claims (6)

A housing that receives soil and sand from above;
A first roll and a second roll are provided at a predetermined interval in the housing and rotated by a rotary drive unit to send the received soil downward;
A soil supplying device comprising: a first change unit that changes the specified gap between the first roll and the second roll to a larger value in accordance with the load on the rotational drive unit caused by the received soil. The soil supplying device according to claim 1, wherein the first change unit increases the predetermined distance and then decreases the predetermined distance between the first roll and the second roll in response to the load of the rotation drive unit. The soil supplying device according to claim 1, wherein the first change unit has an elastic member that biases at least one of the first roll and the second roll to maintain the predetermined distance between the first roll and the second roll, and a guide member that guides the movement of at least one of the first roll and the second roll according to the load of the rotation drive unit. a current detection unit that detects a current value of the rotation drive unit;
The soil supplying device as described in claim 1, further comprising a first control unit that stops the supply of current to the rotation drive unit when the current value of the current detection unit becomes equal to or greater than a predetermined value after the first change unit begins to change. The soil supplying device according to claim 1, further comprising a second control unit that issues an instruction to change the soil processing of an external device that processes the soil when the rotation drive unit is stopped. The soil supplying device according to claim 4, wherein the first control unit instructs the rotation drive unit to adjust the rotation speeds of the first roll and the second roll based on the state of an external device that processes the soil.

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