JP2011162962A - Device and method for sensing operation of opening and closing blade - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a simple device for sensing operation of an opening and closing blade allowing a user to acquire an opened or closed state of the stirring blade securely without using an electrically sensing means such as a sensor or the like. <P>SOLUTION: This device 7 for sensing operation of the opening and closing blade is used in a stirring device having the stirring blade 43 of opening and closing type, a discharge port 47, and a flow passage communicating with the discharge port. This device for sensing also has a valve element (a shielding plate) 71 for opening and closing the discharge port or the flow passage. The valve element is provided to operate in the interlocking relationship with the opening operation of the stirring blade 43 and is closed when the stirring blade is at a blade closing position and is opened when the stirring blade is at a blade opening position. When sensing the opened or closed state of the stirring blade 43 by using this device for sensing it, the stirring blade is displaced from the blade closing position to the blade opening position to open the valve element 71 operating in the interlocking relationship with operation of the stirring blade and discharge a fluid through the discharge port 47. Then, the fluid is discharged from the discharge port 47 through the flow passage. At this moment, this device for sensing senses the opened or closed state of the stirring blade based on pressure and flow rate of fluid discharge. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an apparatus for sensing an open / close state of an open / close type stirring blade provided in a stirring apparatus in the ground.

  Conventionally, in the field of civil engineering such as ground improvement, foundation piles, or soil purification, an agitator equipped with a stirring blade on the outer periphery of the agitation rod is inserted into the ground to a predetermined depth to improve and purify the material in the ground. Discharging, rotating a stirring rod, and stirring and mixing with earth and sand by a stirring blade is performed. However, if there is a hard layer or a ground that you do not want to disturb above the target ground, the stirring blades will be obstructed, making it difficult for the stirrer to penetrate, disturbing the ground unnecessarily, and reducing the effects of stirring. There was a problem of spreading to the department. Therefore, in recent years, a stirring device having an openable and agitated stirring blade that can reduce the diameter of the stirring blade until reaching the target depth and expand the diameter when reaching the target depth has been proposed. Such an opening / closing state of the stirring blade has been conventionally grasped by providing a sensor as disclosed in Patent Document 1, a proximity switch, or an inclinometer.

JP 2008-82101A

  However, the electrical sensing means such as the sensor for detecting the opening / closing status of the stirring blade, the proximity switch, the inclinometer, etc. require ancillary equipment such as a communication cable for transmitting the opening / closing status signal. The structure is complicated and large, and the manufacturing cost and maintenance cost are high. Furthermore, in a conventional sensing device that requires a communication cable for signal transmission, etc., it is necessary to provide a dedicated path for the signal line in the stirrer rod, so that the diameter of the stirrer rod increases and the penetration resistance increases accordingly. There is a problem that construction cannot be performed depending on the hardness of the ground.

  In view of the above-described problems of the prior art, an object of the present invention is an open / close blade operation sensing device that does not use electrical sensing means such as a sensor, and can reliably grasp the open / close state of the stirring blade. An object is to provide a simple opening / closing blade operation sensing device.

  An object of the present invention described above is a sensing device used in an agitating device having an open / close type agitating blade, a fluid discharge port, and a flow path leading to the discharge port, and the opening operation (or opening / closing) of the agitating blade. This is achieved by an opening / closing blade operation sensing device having a valve body for opening and closing the discharge port or the flow path, which is provided so as to be mechanically interlocked with the operation).

  In such an opening / closing blade operation sensing device, the valve body linked to the stirring blade is in a closed state when the stirring blade is in the closed blade position, and is in a valve open state when the stirring blade is in the open position. is there.

  In the method for detecting the opening / closing state of the stirring blade using the opening / closing blade operation sensing device, the valve body linked to the stirring blade is opened by displacing the stirring blade from the closed blade position toward the opened blade position. The fluid can be discharged from the discharge port, and then the fluid is discharged from the discharge port through the flow path, and the opening / closing state of the stirring blade is detected based on the discharge pressure and / or flow rate of the fluid. To.

  According to the opening / closing blade operation sensing device of the present invention, the valve body provided in the flow path or the discharge port is opened in conjunction with the opening operation of the stirring blade. Therefore, the valve opening degree of the valve body can be obtained by measuring at least one of the fluid discharge pressure and the flow rate, and the opening / closing state of the stirring blade can be reliably grasped from the valve opening degree. .

  Moreover, the opening / closing blade operation sensing device of the present invention is composed of only a mechanical structure and does not require electrical means. Therefore, since it is not necessary to provide a sensor, a transmitter, a communication cable and the like on the stirring rod, the stirring device can be made simple and simple, and the diameter size of the stirring rod can be further reduced. As a result, the stirring device can be manufactured at a lower cost, and the penetration rod can be reduced because the stirring rod can be designed to be thin.

  Moreover, since the stirring rod can be made thin, the diameter when in the closed blade position can also be reduced. Thereby, since the diameter expansion ratio (the stirring diameter in the open state / the diameter of the drilling hole in the closed state) can be made larger than before, the disturbance of the ground above the target depth region can be minimized. This can prevent lowering of the strength of the upper layer when used for ground improvement, and can prevent contamination due to the influence of stirring when used for soil purification.

  In addition, since the opening / closing blade operation sensing device of the present invention that does not require a communication cable does not affect the rod structure of the agitator, it is necessary to design the agitator rod simply and simply. It is particularly effective.

  Further, the opening / closing blade operation sensing device of the present invention can be retrofitted without modifying the rod to an existing stirring device as long as the stirring device includes an open / close stirring blade and a flow path. Therefore, the present invention can be widely applied to existing open-type stirring devices.

The state at the time of penetration of the stirring apparatus provided with the opening-and-closing blade operation | movement detection apparatus is shown, FIG. 1 (A) is a front view, FIG.1 (B) is sectional drawing along the aa line. The state at the time of stirring of the stirring apparatus provided with the opening-and-closing blade operation | movement detection apparatus is shown, FIG. 2 (A) is a front view, FIG.2 (B) is sectional drawing along the bb line. The state at the time of extraction of the stirring apparatus provided with the opening-and-closing blade operation | movement detection apparatus is shown. It is a figure which shows the operation | movement at the time of displacing the stirring blade of a stirring apparatus from a closed blade position (FIG. 1) to an open blade position (FIG. 2). It is a figure which shows the operation | movement at the time of displacing the stirring blade of a stirring apparatus from an open blade position (FIG. 2) to an extraction position (FIG. 3). It is a conceptual diagram which shows the opening / closing operation | movement of a stirring blade in the case of constructing using a stirring apparatus. It is a figure which shows the structure and effect | action of an opening-and-closing blade operation | movement detection apparatus based on this invention. It is a figure which shows the structure and effect | action of an opening-and-closing blade operation | movement detection apparatus which concern on a 1st modification. It is a figure which shows the structure and effect | action of an opening-and-closing blade operation | movement detection apparatus which concern on a 2nd modification.

  Hereinafter, an embodiment of an opening / closing blade operation sensing device according to the present invention will be described with reference to the accompanying drawings.

(Configuration of stirring device)
First, an example of a stirring device provided with an opening / closing blade operation sensing device will be described with reference to FIGS.

  The stirring device 1 includes a stirring rod 2 having a drilling bit 41 at the tip, a pair of open / close stirring blades 43 provided on the tip side of the stirring rod, and a stirring blade opening treatment for assisting the opening operation of these stirring blades. A tool 61, a stopper 61 for fixing the stirring blade 43 at a predetermined open position, a release mechanism (a guide hole 33, a positioning pin 45) for releasing the fixed state by the stopper, and an opening / closing blade operation detection described later. It has a discharge port shielding plate (valve element) 71 constituting the main part of the apparatus.

  The stirring rod 2 includes a rod body 3 and a drilling stirring body 4. The rod main body 3 and the excavation stirring body 4 each have a flow path for fluid conveyance inside, and both flow paths are in communication. The excavation stirring body 4 is provided with a fluid discharge port 47 for discharging the fluid conveyed through the flow path into the ground (see FIG. 7). The fluid discharged from the discharge port is stirred with the surrounding soil by the swirling stirring blade 43. In addition, the fluid discharged in the ground is not particularly limited, and various types of fluids such as a soil purification material, a ground improvement material, and water can be employed. Moreover, the aspect of these fluid is not specifically limited, As long as it can flow, it can be used in various aspects, such as gas, a liquid, and a granular material.

  The lower end side of the rod main body 3 is formed in a cylindrical shape, and a shaft portion at the top of the excavation stirring body 4 is inserted inside the rod main body 3. A substantially L-shaped guide hole 33 is formed in the rod body 3, and a positioning pin 45 is fixed to the shaft portion of the excavation stirring body 4. The excavation stirring body 4 can be displaced relative to the rod body 3 within a range in which the positioning pin 45 can move along the guide hole 33. A excavation bit 41 is provided on the tip side of the excavation agitator 4, and a pair of agitation blades 43 are provided at the upper portion of the excavation bit so as to be openable and closable.

  The pair of stirring blades 43 are provided so as to face each other with the shaft portion of the excavation stirring body 4 interposed therebetween. The stirring blade 43 is formed in a ladder shape, for example, and has rotating bodies 51 and 52 at its base end (see FIG. 2B). The rotating bodies 51 and 52 of the stirring blade 43 are connected to the excavation stirring body 4 of the stirring rod 2 by a connecting shaft 53, and each stirring blade can swing freely in the vertical direction with the rotating bodies 51 and 52 as a base point. The connecting shaft 53 at the base of each stirring blade is provided so as to rotate integrally with the stirring blade.

The stirring blade 43 having the above-described configuration is set to a “closed blade position” in which the stirring blade 43 is closed upward when the tip of the stirring blade 43 penetrates into the ground (FIG. 1). At this closed blade position, the stirring blade 43 is integrated with the rod body 3 in appearance to form a single columnar body as a whole.
During agitation, the agitation blade 43 is swung downward from the closed blade position to open (FIG. 1 → FIG. 2), and the agitation diameter D is set to an “open blade position” where the agitation diameter D is larger than the drilling diameter at the time of penetration. , Fixed by a stopper 61. In the illustrated embodiment, the pair of stirring blades 43 swing 90 ° and extend in opposite directions (horizontal directions), and as a result, the stirring diameter D (FIG. 2), which is the turning trajectory of the tip of the stirring blade, is maximum. It becomes.
At the time of pulling out, the fixed state of the stirring blade 43 by the stopper 61 is released, and the stirring blade is swung to the “drawing position” where it is hung and closed downward (FIG. 3).

  A flat engagement surface is formed on one rotating body 51 at the base end of the stirring blade 43. This engaging surface comes into contact with the flat bottom side of the stopper 61 when the stirring blade 43 is in the open position (FIG. 2). Since the flat surfaces of the stopper 61 and the rotating body 51 are in contact with each other in this manner, the swing of the stirring blade 43 is hindered, so that the stirring blade is fixed at the blade opening position shown in FIG.

  The stirring blade opening jig 31 is slidable in the vertical direction along the outer peripheral surface of the rod body 3. The stirring blade opening jig 31 slides downward by the resistance received from the surrounding ground by pulling up the stirring rod 2 and plays a role of urging the stirring blade 43. Due to the downward urging by the stirring blade opening jig 31, the stirring blade 43 starts to swing from the closed blade position (FIG. 1) to the opened blade position (FIG. 2).

  The stopper 61 is provided at the lower end of the rod body 3 of the stirring rod 2 and is located above the rotating body 51 of the stirring blade 43. As shown in FIGS. 1B and 2B, two stoppers 61 are provided so as to extend horizontally in opposite directions, and each stopper is provided to be rotatable with respect to the rod body 3. Fixed to the rotating member. When the stirring blade 43 is in the open position shown in FIG. 2, the bottom surface side of the stopper 61 comes into contact with the flat engaging surface of the rotating body 51 of the stirring blade 43 to fix the stirring blade in the open position.

The stopper 61 having the above-described configuration is urged by the compression coil spring 62 and can be swung with the sliding rotation of the rotating member at the base end thereof. However, since the clutch 65 (stopper rotation stop member) is provided, it can turn only within a predetermined angle range.
In the closed blade position shown in FIG. 1, the stopper 61 is urged by the compression coil spring 62, but does not turn because the blades of the stirring blade 43 are obstructing.
In the process of displacement from the closed blade position in FIG. 1 to the open blade position in FIG. 2, the blade 61 moves away from the stopper 61 as the stirring blade 43 is opened, so that the stopper 61 is urged by the compression coil spring 62 and turns gradually. To do.

  The release mechanism for releasing the fixed state of the stirring blade 43 by the stopper 61 includes a guide hole 33 formed in the outer peripheral surface of the rod body 3 and a positioning pin 45 movable along the guide hole. . The positioning pin 45 is fixed to the shaft portion of the excavation stirring body 4. The guide hole 33 for guiding the positioning pin 45 has a substantially L-shape formed by connecting a horizontal hole and a vertical hole. Due to the engagement relationship between the L-shaped guide hole 33 of the rod body 3 and the positioning pin 45 of the excavation stirrer 4, the excavation stirrer 4 can be rotated relative to the rod body 3 within a predetermined angle range. Relative movement is possible for a predetermined length.

(Opening and closing operation of stirring blade)
Next, the opening / closing operation | movement of the stirring blade 43 at the time of construction is demonstrated, referring the series of processes shown in FIG. 1 to FIG. 3 as necessary for the specific configuration of the stirring device 1, and FIG. 4 for the operation for fixing the opened stirring blade 43, and fixing the opened stirring blade 43. Refer to FIG. 5 for the operation for canceling the state.

  Prior to the start of penetration shown in FIG. 6 (a), as shown in FIG. The stirring blade opening jig 31 is positioned so as to be positioned above the tip of the stirring blade 43. Next, penetration of the stirring device 1 is started while rotating forward (rightward).

  While the stirrer 1 is penetrating (FIG. 6 (a) → (b)), the stirring blade 43 maintains the closed blade state shown in FIG. 1, and the stirring blade 43 is integrated with the rod body 3 in appearance. As a whole, one columnar body is formed. Therefore, the stirring blade 43 does not hinder the penetration at the time of penetration.

  When the penetration is continued and the target depth is reached (FIG. 6B), the stirring device 1 is pulled up by a predetermined length while rotating forward. Then, the stirring blade opening jig 31 at the upper end of the stirring blade 43 slides downward under the resistance of the earth and sand accompanying the pulling up of the stirring device 1 and stirs to swing from the closed blade position to the open blade position. Energize the wings. The urging force by the stirring blade opening jig 31 triggers the swinging so that the stirring blade 43 opens (FIG. 6 (b) → (c)). Thereafter, the agitating blade 43 directly receives the resistance of the earth and sand accompanying the pulling up and swings downward while piercing the surrounding ground (FIG. 6C). On the other hand, as the stirring blade 43 is opened, as shown in FIGS. 4A to 4F, the stopper 61 is urged by the compression coil spring 62 and turns by a predetermined angle.

Then, when the stirring blade 43 swings 90 ° and reaches the position where the stirring diameter becomes maximum (horizontal position), as shown in FIG. 4 (f), the stirring blade 43 against the flat bottom surface of the swung stopper 61. The flat engagement surface of the rotator 51 at the base of the abutment comes into contact, and the rotation of the rotator 51 is prevented. Thereby, each stirring blade is fixed to the open blade position of FIG. 2 (FIG. 6C).
Thereafter, while the stirring device 1 is rotated in the forward direction, the penetration and pulling up in a predetermined depth region are repeated for the necessary cycles, and stirring is performed by the rotating stirring blade 43 (FIG. 6 (c) → (d) → (e) → (f)).

  When the stirring process shown in FIGS. 6C to 6F is finished and the stirring apparatus 1 is pulled out from the ground, the stirring apparatus is reversed. Then, due to the resistance of the surrounding ground received via the stirring blade 43 and the excavation bit 41, the excavation agitator 4 inserted on the distal end side of the rod body 3 starts to rotate relatively. At this time, as shown in FIG. 5, the positioning pin 45 of the excavation stirring body 4 moves laterally along the guide hole 33 of the rod body 3, and when reaching the vertical hole, the excavation stirring body 4 receives the reaction force of the ground. The rod main body 3 is raised by the length of the vertical hole by the pulling force. As a result, as shown in FIG. 5C, the stopper 61 is separated from the rotating body 51 of the stirring blade 43 by a predetermined length, so that the fixed state of the stirring blade by the stopper is released.

  Then, when the stirring device 1 is pulled up while being reversed (FIG. 6 (f) → (g)), the stirring blade 43 receives the resistance of the surrounding ground due to the lifting, and is brought into the “drawing position” where it hangs down as shown in FIG. Swing and close down. Thereafter, the stirring blade 43 does not become an obstacle to pulling out, and the stirring device 1 can be pulled out from the ground.

(Configuration of open / close blade operation sensing device)
Next, the opening / closing blade operation sensing device of the present invention will be described with reference to FIG.
In the embodiment shown in FIG. 7, the opening / closing blade operation sensing device 7 includes a discharge port shielding plate 71 that is a shutter-type valve body, a rotary shaft 73 that rotatably supports the shielding plate, and a valve that closes the shielding plate. And a positioning member 75 for positioning in a state.

  The shielding plate 71 has a substantially circular closing portion 77 that can completely close the discharge port 47, the distal end side of the shielding plate 71 is supported by the positioning member 75, and the proximal end side can interfere with the stirring blade 43. It is like that. The positioning member 75 supports the front end side of the shielding plate at a position where the closing portion 77 of the shielding plate 71 closes the discharge port 47 and plays a role of positioning in the valve-closed state shown in FIG. The rotating shaft 73 is located between the closed portion 77 and the base end of the shielding plate 71. As shown in FIG. 7B, when the proximal end side of the shielding plate 71 is pushed in by the stirring blade 43, the shielding plate rotates and the discharge port 47 starts to open.

(Operation of open / close blade operation sensing device)
Next, the operation of the opening / closing blade operation sensing device in the series of steps shown in FIG. 6 will be described with reference to FIG.

When the stirrer is inserted (FIG. 6 (a) → (b)), as shown in FIG. 7 (a), the shielding plate 71 is located in the “valve closed state” in which the discharge port 47 is closed.
When the stirring device reaches the target depth and starts opening the stirring blade 43 (FIG. 6 (b) → (c)), the swinging stirring blade 43 pushes in the proximal end side of the shielding plate 71, and FIG. 7 (b). The shield plate 71 is gradually rotated as shown in FIG.
When the stirring blade 43 swings 90 ° to reach the horizontal position (FIG. 6C), the shielding plate 71 reaches the “valve open state” in which the discharge port 47 is completely opened as shown in FIG. 7C. .
When the stirring blade 43 is closed downward when pulling out the stirring device (FIG. 6 (f) → (g)), the stirring blade 43 passes through the base end portion of the shielding plate 71 in the process, and the shielding plate is free. It reaches a state where it can rotate. The shielding plate 71 receives the resistance of the earth and sand accompanying the pulling up, and reaches a “valve closed state” in which the discharge port 47 is closed as shown in FIG.

(Operating detection method for opening and closing blades)
At the time of construction, it cannot be visually confirmed whether or not the stirring blade 43 has reached the horizontal position (FIG. 6C). Therefore, when it is estimated that the stirring blade 43 has reached the horizontal position, the fluid is discharged from the discharge port 47 through the flow path in the stirring rod, and at that time, the stirring blade is based on the discharge pressure and flow rate of the fluid. 43 open / close status is detected. In addition, when the discharge port 47 is completely closed, the discharge amount of the fluid becomes zero and the discharge pressure increases. On the other hand, when the discharge port 47 is open, according to the valve opening degree of the shielding plate 71, the discharge amount of the fluid increases and the discharge pressure decreases. Therefore, the degree of opening of the discharge port 47 can be obtained by measuring the discharge pressure and flow rate of the fluid, and based on this, the open / close state of the stirring blade 43 can be grasped.

  When it is determined that the opening degree of the stirring blade 43 is incomplete, the stirring device is pulled up to further swing the stirring blade. On the other hand, when it is determined that the stirring blade 43 is fully opened, the stirring operation is performed while the stirring device is rotated forward.

  The above-described opening / closing blade operation sensing device is an example of an embodiment of the present invention, and various modifications are possible within the scope of the invention described in the claims. For example, it is also possible to employ the following modifications of the opening / closing blade operation sensing device.

(First modification of the opening / closing blade operation sensing device)
The opening / closing blade operation sensing device 8 according to the first modification shown in FIG. 8 includes a rotary disk-like valve body 81 provided in front of the discharge port of the flow path, and a rotary shaft 83 that holds the valve body. The gear 85 is provided integrally with the rotating shaft, and the gear 87 is provided integrally with the connecting shaft 53 of the stirring blade 43 and meshes with the gear 85.

When the stirrer is inserted (FIG. 6 (a) → (b)), as shown in FIG. 8 (a), the valve element 81 is positioned in a “valve closed state” in which the flow path is blocked.
When the stirring device reaches the target depth and starts to open the stirring blade (FIG. 6B → (c)), the connecting shaft 53 rotates with the swing of the stirring blade 43. At the same time, as shown in FIG. 8 (b), the rotation of the connecting shaft 53 is transmitted to the valve body 81 via the gears 87 and 85 and the rotating shaft 83. The valve body 81 rotates.
When the stirring blade 43 swings 90 ° to reach the horizontal position (FIG. 6C), the valve body 81 reaches an “open state” in which the flow path is completely opened as shown in FIG. 8C.
When the stirring blade 43 is closed downward when pulling out the stirring device (FIG. 6 (f) → (g)), the valve body 81 rotates again in conjunction with the swing of the stirring blade 43. As a result, as shown in FIG. 8D, the valve body 81 reaches a “valve closed state” in which the flow path is blocked.

  The open / close state of the stirring blade 43 in this series of steps can be grasped by the same method as the sensing method described above.

(Second modification of the opening / closing blade operation sensing device)
The open / close blade operation sensing device according to the second modification shown in FIG. 9 is installed on the shielding rubber sleeve 91 that forms a part of the flow path in the excavation stirring body 4 and the connecting shaft 53 of each stirring blade. And a shielding pin 93.

  The shielding rubber sleeve 91 that forms a rubber hose-like valve body is configured to be crushed and deformed when an external force is applied, and blocks the flow path (or restricts the flow rate according to the deformation amount) during the deformation. Have a role. The shielding pins 93 erected on the connecting shafts 53 of the respective stirring blades have a role of deforming the shielding rubber sleeve 91 so as to squeeze in cooperation with the shielding pins facing each other across the flow path.

When the stirrer is inserted (FIG. 6 (a) → (b)), as shown in FIG. 9 (a), the shielding rubber sleeve 91 is at the tip of the shielding pins 93, 93 facing each other across the flow path. It is deformed into a “valve closed state” that is pushed and pinched to block the flow path.
When the stirring device reaches the target depth and starts to release the stirring blade (FIG. 6 (b) → (c)), the connecting shaft 53 rotates with the swing of the stirring blade 43, so FIG. 9 (b) As shown, the shielding pin 93 rotates in conjunction with the swing operation of the stirring blade 43.
When the stirring blade 43 swings 90 ° to reach the horizontal position (FIG. 6C), the crushed shielding pin 93 is separated from the shielding rubber sleeve 91 as shown in FIG. Returns to the “valve open state” which completely opens the flow path.
When the stirring blade 43 is closed downward when pulling out the stirring device (FIG. 6 (f) → (g)), the shielding pin 93 rotates again with the swing of the stirring blade 43. As a result, as shown in FIG. 9 (d), the shielding rubber sleeve 91 is pressed between the tip portions of the shielding pins 93 and 93 facing each other across the flow path to enter a “valve closed state” that blocks the flow path. Deform.

  The open / close state of the stirring blade 43 in this series of steps can be grasped by the same method as the sensing method described above.

(Modification of stirring device)
In the embodiment described above, as an application example of the opening / closing blade operation sensing device, the agitation device provided with the opening / closing blades that does not require hydraulic pressure, a push rod, or the like is illustrated, but the opening / closing blade operation sensing device according to the present invention can be applied. The apparatus is not limited to this.
For example, as disclosed in JP2003-035083, JP2003-106082, JP2005-315052, JP2009-002082, a hydraulic cylinder for opening and closing a stirring blade, The present invention can also be applied to a stirring device provided with a push rod for pushing and pulling the stirring blade, a link mechanism, and the like.

(Effect of the opening / closing blade operation sensing device according to the present invention)
As described above, according to the present invention, the valve element provided in the flow path or the discharge port is opened in conjunction with the opening operation of the stirring blade. Therefore, the degree of valve opening of the valve element can be obtained by measuring the discharge pressure and flow rate of the fluid, and the opening / closing status of the agitating blade can be reliably grasped from the degree of valve opening.

  Moreover, the opening / closing blade operation sensing device of the present invention is composed of only a mechanical structure and does not require electrical means. Therefore, since it is not necessary to provide a sensor, a transmitter, a communication cable and the like on the stirring rod, the stirring device can be made simple and simple, and the diameter size of the stirring rod can be further reduced. As a result, the stirring device can be manufactured at a lower cost, and the penetration rod can be reduced because the stirring rod can be designed to be thin.

  Moreover, since the stirring rod can be made thin, the diameter when in the closed blade position can also be reduced. Thereby, since the diameter expansion ratio (the stirring diameter in the open state / the diameter of the drilling hole in the closed state) can be made larger than before, the disturbance of the ground above the target depth region can be minimized. This can prevent lowering of the strength of the upper layer when used for ground improvement, and can prevent contamination due to the influence of stirring when used for soil purification.

  In addition, since the opening / closing blade operation sensing device of the present invention that does not require a communication cable does not affect the rod structure of the agitator, it is necessary to design the agitator rod simply and simply. It is particularly effective.

  Further, the opening / closing blade operation sensing device of the present invention can be retrofitted without modifying the rod to an existing stirring device as long as the stirring device includes an open / close stirring blade and a flow path. Therefore, the present invention can be widely applied to existing open-type stirring devices.

DESCRIPTION OF SYMBOLS 1 Opening-and-closing stirrer 2 Stirring rod 3 Rod body 4 Excavation stirring body 7 Opening and closing blade operation sensing device 8 Opening and closing blade operation sensing device 31 Stirring blade opening jig 33 Guide hole 41 Excavation bit 43 Opening and closing stirring blade 45 Positioning pin 47 Discharge port 51 Rotating body 52 Rotating body 53 Connecting shaft 61 Stopper 62 Compression coil spring 65 Clutch 71 Discharge port shielding plate (valve element)
73 Rotating shaft 75 Positioning member 77 Closed portion 81 Valve body 83 Rotating shaft 85 Gear 87 Gear 91 Shield rubber sleeve (valve body)
93 Shielding pin

Claims (3)

A sensing device used in a stirring device having an open / close stirring blade, a fluid discharge port, and a flow path leading to the discharge port,
An opening / closing blade operation sensing device comprising a valve body for opening and closing the discharge port or the flow path, which is provided so as to interlock with the opening operation of the stirring blade. The valve body interlocked with the stirring blade is
When the stirring blade is in the closed blade position, the valve is in a closed state;
The opening / closing blade operation sensing device according to claim 1, wherein the agitation blade is in a valve-open state when the stirring blade is in the open position. A method for detecting the opening / closing state of a stirring blade using the opening / closing blade operation sensing device according to claim 1,
Displace the stirring blade from the closed blade position toward the open blade position to open the valve body linked to the stirring blade so that fluid can be discharged from the discharge port,
The fluid is discharged from the discharge port through the flow path, and at that time, the opening / closing state of the stirring blade is detected based on the discharge pressure and / or flow rate of the fluid.
An opening / closing blade operation sensing method for a stirring device.