JPH0814232B2 - Ground improvement machine automatic feed device - Google Patents

Description

TECHNICAL FIELD The present invention relates to an automatic feed device and a turntable for a ground improvement machine that continuously feeds pipes, bars and the like. More specifically, a ground improvement machine auto-feed device for continuously feeding pipes, rods, etc. used for boring machines, ground improvement machines, earth auger machines, etc., and a turntable for changing direction with the ground improvement machine body. Regarding

[Prior Art] When excavating rock with a normal boring machine, the spindle of the boring machine gives rotation and excavation force to a rod having a bit at its tip to dig a hole. However, the spindle is 50cm-1m per stroke
Since it is only the length of the spindle, when drilling up to the stroke end of the spindle, stop the rotation of the spindle once, loosen the chuck of the spindle that clamps the rod and stop the constraint of the rod and chuck, then feed the spindle to the top. The machine raises the rod, re-grasps the rod with the chuck, restrains the spindle and the rod, operates the feed device, and restarts excavation. When excavating with an ordinary boring machine, the excavation work is thus interrupted.

On the other hand, a ground improvement machine for injecting a ground improvement agent such as mortar into the ground for the purpose of ground improvement is known. The ground improvement agent such as this mortar pressurizes and injects the mortar through a hollow rod. At this time, while discharging the ground improvement agent from the tip of the rod, the rod is rotated and pulled up to inject mortar. In this conventional ground improvement machine,
This is done while injecting the ground improvement agent from the tip of the rod, but it is necessary to stop pulling up of the rod at predetermined intervals.

This is because when the ground improvement machine feeds the rod, the stroke of the feeding device is limited and it is necessary to re-grip the chuck holding the rod, so it is necessary to stop and move the chuck downward. .

In addition, the ground improvement machine has to use a crane when trying to change the direction in order to change the ground improvement position and the like due to overlapping. Cranes may not be available in all locations. Also, if you can move a small distance, you want to avoid using a crane.

[Problems to be Solved by the Invention] The present invention has been invented in the technical background as described above, and is for achieving the following objects.

An object of the present invention is to provide an automatic feed device for a ground improvement machine for continuously feeding a rod without interrupting work.

Another object of the present invention is to provide an automatic feed device of a ground improvement machine for feeding a rod at an arbitrary speed feed.

Still another object of the present invention is to provide a turntable for a ground improvement machine which can change direction with a simple structure.

[Means for Solving the Problems by the Invention] In order to solve the above problems, the following means are adopted.

An automatic feed device for a ground improvement machine according to the present invention includes a frame forming a main body, a first spindle rotatably supported by a first shack main body, and a first spindle provided on the first spindle for holding and releasing a rod. Chucking means; and a second spindle that faces the first chucking means and is movable in a coaxial line direction with the first spindle, and that is rotatably supported by the second chuck body so as not to rotate on the first spindle. Second chuck means provided on the second spindle for holding and releasing the rod; chuck rotation driving means for rotationally driving the first spindle and the second spindle; and the first chuck body for the frame. A first feeding means for driving the rod in the feeding direction of the rod, and the second chuck body between the frame and the first feeding means. A second feed means for driving the rod in the feed direction and a feed control for continuously feeding the rod by alternately operating the first and second feed means and the first and second chuck means. And means.

The feed control means may be provided with a scale having continuous scales for detecting the positions of the first and second feed means, and a sensor for detecting the scale.

Further, it is preferable that the scale is a continuous concave-convex scale, both ends are formed higher than the concave-convex, and the sensor is composed of three proximity sensors.

[Operation] A fed body such as a rod is gripped by the first chuck means or the second chuck means provided so as to face the first chuck means. During this gripping, the first and second chuck means are simultaneously rotated by the chuck rotation drive means. The first
The chuck means is fed and driven by the first feeding means, and the second chuck means is fed and driven by the second feeding means. The first and second
The feeding means and the first and second chuck means are alternately operated to continuously feed the fed body without stopping.

[Embodiment] An embodiment in which the present invention is applied to a ground improvement machine will be described below with reference to the drawings. FIG. 1 is a front view of the ground improvement machine, and FIG. 2 is a left side view of the same. The frame 1 is made of a structural rigid material and has a substantially rectangular parallelepiped structure. A swivel head body 2 is fixed to the front surface of the frame 1 with bolts. Two upper feed hydraulic cylinders 3, 3 and two lower hydraulic feed cylinders 4, 4 are fixed to the upper and lower sides of the swivel head body 2.

An upper hydraulic chuck body 60 is fixed to the piston rods of the upper feed hydraulic cylinders 3 and 3 via a flange 53, and a lower hydraulic chuck body 61 is fixed to the piston rods of the lower feed hydraulic cylinders 4 and 4. ing. As will be described later, the chuck in the lower hydraulic chuck body 61 and the chuck in the upper hydraulic chuck body 60 alternately hold a rod (not shown) for injecting ground improvement agent, and continuously rotate and axially move the rod. Send to. A hydraulic rod holder 7 is arranged below the lower hydraulic chuck body 61.

The hydraulic rod holder 7 is used when temporarily fixing the rod in preparation work and the like, and is not used during automatic operation of the ground improvement machine. The hydraulic rod holder 7 has a claw
The rod is held between 7a and 7b to perform preparatory work. On the front surface of the swivel head body 2, there is a change lever 8
The gear change lever 8 is used to move the transmission gear 43 so that the first, second and third spindles 31, 3 will be described later.
Change 2,34 between high speed and low speed.

A proximity switch box 9 is integrally provided on one front side surface of the swivel head main body 2. Three proximity switches are housed in the proximity switch box 9 (Fig. 6). The scale 10 is fixed to the lower hydraulic chuck body 61. When the lower hydraulic chuck body 61 moves up and down,
Since the scale 10 is also integrated, it moves up and down at the same time, and this up and down movement is detected by the proximity switches SWA, SWB, SWC. The details will be described later.

A power control panel 11 is provided on the side surface of the frame 1.
A power supply circuit for controlling a motor for driving a hydraulic pump, which will be described later, is incorporated in the power control board 11. Control panel 12
Is an operation panel on which buttons and switches for operating the ground improvement machine are arranged. The hydraulic operation panel 13 is an operation panel in which switches for operating the hydraulic system are arranged. The oil pump 14 is a variable displacement piston pump type oil pump for lubricating oil, and pressurized lubricating oil is supplied to each part. The oil tank 15 is a tank that stores oil for hydraulic pressure.

The motor 16 is a drive motor for driving the other two oil pumps (not shown). Two oil pumps are used for rotating the spindle and feeding the oil. The turntable 17 is used when changing the direction of the frame 1, and rotates the frame 1 about the vertical axis. A manual jack 18 is provided on the front surface of the frame 1. The manual jack 18 is for fixing the frame 1 to the ground surface.

The slide base 19 slides on the frame 1 to move the entire ground improvement machine back and forth from the hydraulic cylinder, and is used for positioning when using the ground improvement machine. FIG. 3 is a cross-sectional view of the automatic feed device portion of the ground improvement machine. FIG. 4 is a sectional view taken along the line IV-IV in FIG. The first spindle 31 at the center of the drawing is a hollow pipe. The second spindle 32 is inserted into the inner peripheral surface of the first spindle 31. A key 33 is interposed between the first spindle 31 and the second spindle 32.

Therefore, the rotation of the first spindle 31 can be transmitted to the second spindle 32 and can be slid in the axial direction. The peripheral surface of the inner hole of the second spindle 32 has an octagonal cross section (Fig. 4). The octagonal inner surface has a third spindle
34 is inserted. Since the outer peripheral surface of the third spindle 34 is also formed in an octagonal shape, the second and third spindles 32 and 34 are slidable relative to each other in the axial direction and do not rotate relative to each other in the rotation direction. After all, the rotation of the first spindle 31
It is transmitted to the second spindle 32 and the third spindle 34.

The first spindle 31 is rotatably provided on the swivel head main body 2 by two bearings 36, 36. Further, the first spindle 31 is provided with a gear 37 via a key. On the other hand, the swivel head body 2 is provided with a hydraulic motor 40. The output shaft of the hydraulic motor 40 is a spline shaft.
41 is attached via the key. The spline shaft 41 is
The swivel head body 2 is rotatably supported by two bearings 42. The spline shaft 41 has two gears 44,4
A speed change gear 43 having 5 is slidably inserted.

An intermediate shaft 46 is rotatably supported on the swivel head main body 2 by bearings 47 in parallel with the spline shaft 41. An idle gear 48 is integrally provided on the intermediate shaft 46. Further, two idle gears 49 and 50 are key-connected to the intermediate shaft 46. The idle gear 48 meshes with the gear 37.
The action from the hydraulic motor 40 to the first spindle 31 is performed as follows. In the case of low speed rotation, first, the speed change gear 43 is slid on the spline shaft 41, and the low speed rotation gear 44 is engaged with the gear 50.

The rotational output of the hydraulic motor 40 sequentially drives the spline shaft 41, the low speed rotation gear 44, the idle gear 50, the idle gear 48, and the gear 37, and drives the first spindle 31. In the case of high speed rotation, the speed change gear 43 is slid on the spline shaft 41, and the high speed gear 45 and the idle gear 49 are engaged with each other. Hydraulic motor
The rotation output of 40 sequentially drives the spline shaft 41, the high speed gear 45, the idle gear 49, the idle gear 48, and the gear 37,
Drive the spindle 31.

On the other hand, on the front surface of the swivel head main body 2, four feed hydraulic cylinders 3 and 4 are provided. This feed hydraulic cylinder
3 and 4 are for feeding the second spindle 32 and the third spindle 34 in the vertical direction. A piston 51 is inserted in the upper feed hydraulic cylinder 3. The piston rod 52 of the piston 51 is fixed to the flange 53. The flange 53 is provided integrally with the upper hydraulic chuck body 60.

A lower feed hydraulic cylinder 4 is arranged at a symmetrical position of the upper feed hydraulic cylinder 3 with the swivel head main body 2 interposed therebetween. A piston 55 is inserted in the lower feed hydraulic cylinder 4. Similarly, a piston rod 56 is fixed to the piston 55 so as to face each other.
Is fixed to the flange 57 with a nut. Flange 57
Are fixed to the lower hydraulic chuck body 61.

The lower hydraulic chuck body 61 is rotatably supported on the outer circumference of the second spindle 32 by a thrust ball bearing 62 and a radial ball bearing 63. An ank clamp piston 64 is provided in the lower hydraulic chuck body 61. The unclamp piston 64 drives a claw driving piece 68 for gripping a rod, which will be described later. The unclamp piston 64 moves downward when the hydraulic pressure is supplied from the hydraulic pressure supply port 65, and moves upward when the hydraulic pressure is supplied from the lower hydraulic pressure supply port 66.

An annular pressing piece 67 is attached to the outer periphery of the lower end of the unclamp piston 64. Below the unclamp piston 64, a cylindrical pawl drive piece 68 is provided. Claw drive piece 68
A plurality of disc springs 69 are interposed between the lower end of and the lower hydraulic chuck body 61. Therefore, the disc spring 69 always pushes the claw driving piece 68 toward the pressing piece 67. On the inner peripheral surface of the claw driving piece 68, three gripping claws 70 are slidably provided on the tapered surface 71. One end of the grip claw 70 is partially exposed in the center hole 73 from a claw insertion hole 72 provided in the second spindle 32.
Hold the rod in the center hole 72.

The internal structure of the upper hydraulic chuck body 60 is completely symmetrical to that of the lower hydraulic chuck body 61 and will not be described here.

Hydraulic Circuit FIG. 5 shows a hydraulic circuit diagram of the automatic feed device of the ground improvement machine. Unclamp piston 64 as described above
Is a piston for unclamping the grip claw 70 for gripping the rod. The upper and lower hydraulic chuck bodies 60 and 61 are provided respectively. Switching valves 80 and 81 are connected to the hydraulic pressure supply ports 65 and 66 of the unclamp piston 64. Whether or not the unclamp piston 64 is operated is detected by a pressure sensitive switch (not shown) provided in the circuit. This switching valve
A hydraulic pump 82 is connected to 80 and 81. The two hydraulic pumps 82, 82 are rotationally driven by an electric motor 83.

In the hydraulic unit of this embodiment, the hydraulic pumps 82, 82 are
It has two units. The oil discharged from the switching valves 80 and 81 is cooled by the cooling device 8
It is returned to the drain 85 through 4 etc. The rod holder cylinder device 86 drives the claws 7a and 7b of the hydraulic rod holder 7, and is operated when it is necessary to temporarily fix the rod during preparation for work. This rod holder cylinder device 86 also has a switching valve from the hydraulic pump 82.
Pressure oil is supplied via 87 and the check valve 88.

The four vertical feed hydraulic drive cylinders 3 and 4 are drive devices for continuously driving the upper and lower hydraulic chuck bodies 60 and 61 in the vertical direction. Pressure oil is supplied to the upper and lower feed hydraulic cylinders 3 and 4 from a hydraulic pump 82 via a switching valve 89. The hydraulic motor 40 is for rotating and driving the first, second and third spindles 31, 32, 34. A switching valve 90 is provided in the pressure oil passage communicating with the hydraulic motor 40. The direction of the switching valve 90 can be switched so that the hydraulic motor 40 can be selected for either forward rotation or reverse rotation.

The hydraulic pump 82 that supplies pressure oil to the hydraulic motor 40 is supplied from a hydraulic pump 82 that is different from the hydraulic pump 82 that supplies the unclamp piston 64 and the rod holder cylinder device 86. Therefore, the hydraulic motor 40 can be stably rotated. FIG. 6 shows the arrangement of the scale 10 and the proximity switches SWA, SWB, SWC for detecting the vertical movement position and the amount of movement of the upper and lower hydraulic chuck bodies 60, 61. Protrusions 10a are regularly formed on the scale 10.

In this example, this distance is 25 mm. Terminal protrusions 10b are formed above and below the scale 10. The protrusion 10a and the terminal protrusion 10b have a height difference l. On the other hand, three proximity switches SWA, SWB, SWC are fixedly provided in the proximity switch box 9 so as to face the scale 10. Similarly, the proximity switches SWA, SWC and the proximity switch SWB have a height difference l. Eventually, the protrusion 10a is detected by the proximity switch SWA as the scale 10 moves up and down, and the terminal protrusion 10b is detected by SWA and SWC.

The signals of the proximity switches SWA and SWC are input to the preset counter 100. The preset counter 100 has a protrusion
The number of 10a and the end projection 10b is counted, the number of steps is displayed on the power control panel 11, and a signal for stopping the feeding is counted by counting the set number of constant pulses.

Operation The operation sequence of the ground improvement machine will be described below. FIG. 7 is a flowchart showing an outline of the operation of raising the rod of the ground improvement machine. FIG. 8 is a diagram showing an operation sequence of the upper hydraulic chuck 60, the lower hydraulic chuck 61 and the claw 69 therein. Note that this operation is performed by a sequence circuit (not shown). First, turn on the main power circuit of the power control panel 11.
To do. After that, the switch of the electric motor 83 (FIG. 5) of the hydraulic circuit is turned on (steps P ₁ and P ₂ , the following steps are omitted).

The hydraulic circuit is now ready for operation. Operator by selecting the automatic operation (P _3), it is determined whether automatic driving state. That is, if the hydraulic rod holder 7 is in operation, the rod cannot be automatically fed, so do not operate it (P ₄ ). It is determined whether either the upper hydraulic chuck body 60 or the unclamp piston 64 of the lower hydraulic chuck body 61 is operating (P ₅ ). That is, when the unclamp piston 64 moves downward and the pressing piece 67 is pressed, the grip claw 69 releases the holding of the rod.

If neither of the upper hydraulic chuck body 60 and the lower hydraulic chuck 61 holds the rod, the rod cannot be fed, so check this (P ₅ ). The unclamp piston 64 is operated or not operated by a pressure switch (not shown) provided in the hydraulic circuit. After confirming the operation and non-operation of the unclamp piston 64,
Upper feed hydraulic cylinder 3 or lower feed hydraulic cylinder 4
Start the operation of (P ₆ ). Temporarily, the lower hydraulic chuck body
If the rod is held at 61, lower feed hydraulic cylinder 4
Operate.

If the upper hydraulic chuck body 60 holds the rod,
The upper feed hydraulic cylinder 3 is operated (Fig. 8 (d)). This actuation selection is pre-loaded by the logic to actuate alternately in the sequence circuit. By this operation, the proximity switch SWB detects the protrusion 10a of the scale 10 (P ₇ ) and generates a pulse signal. This pulse signal is counted by the preset counter 100 to reach the set number of pulses (P ₉ ), and if it is necessary to temporarily stop the feed of the rod, the switching valve 89 is operated to stop the upper feed hydraulic cylinder 3, stopping the feed between the rod set time (P _10).

In the case of the ground improvement machine, this is a case where it is better to stop the injection of mortar by stopping the rod at regular intervals, for example, under the conditions of the ground. The stop time can be set by a timer (not shown) or the like. However, if it is not necessary, the set time may be set to 0 and continuous operation may be performed. When the proximity switch SWC detects the end projection 10b, it prepares to switch from the stroke end of the lower hydraulic feed cylinder 4 (state of FIG. 8 (e)). A chuck switching timer (not shown) is activated and started.

Next, the switching valves 80 and 81 are switched to the upper hydraulic chuck 6
Tighten 0 and loosen the lower hydraulic chuck 61 (P ₁₄ , Fig. 8 (e)). At this time, the rod is temporarily gripped by both gripping claws 70, 70 for a set time (FIG. 8 (f)).

This is an operation for ensuring the reholding of the rod. Loosen the lower hydraulic chuck 61 (P ₁₄ , Fig. 8 (a)). When this operation is confirmed, the switching valve 89 is switched to operate the upper feed hydraulic cylinder 3 to feed the rod upward. At the same time, the lower feed hydraulic cylinder 4 returns to its original position (Fig. 8 (b)). When this operation starts, the proximity switch SWB starts detecting the protrusion 10b again. At the stroke end of the upper feed hydraulic cylinder 3, this time the proximity switch SWA operates (P ₁₇ ) and the chuck switching timer operates, and after simultaneous gripping by both chucks (P ₁₈ , Fig. 8 (c)). , it starts the operation and reverse operation a series of cycles (P ₁₉ to P _20, FIG. 8 (d)).

[Other Embodiments] The above embodiment is applied to a ground improvement machine,
As is clear from the above description, it can be applied to the feed of the rod of the boring machine. The excavation efficiency is good because there is no down time of the rod during excavation. The ground improvement machine used a sequence circuit using a relay to control. However, as long as the operation is based on the above principle, any known control device such as a programmable controller or a control device using a microcomputer may be used.

Further, the length of the scale is detected by unevenness, but another scale such as a magnetic scale or an optical scale may be used. In the above-mentioned embodiment, the feed speed of the rod and the rotation speed of the rod, that is, the rotation with the hydraulic motor 40 are not related, but it is also possible to attach a pulse encoder to the hydraulic motor so that the feed and the rotation have a constant ratio. . This technique is known and will not be described in detail here.

[Effects of the Invention] As described in detail above, the automatic feed device of the ground improvement machine of the present invention can feed the rod continuously or intermittently and automatically. Therefore, there is an effect that the ground improvement agent and excavation efficiency are dramatically increased.

In addition, since the turntable is placed under the ground improvement machine, the direction can be changed easily.

[Brief description of drawings]

FIG. 1 is a front view of the ground improvement machine, FIG. 2 is a side view of FIG. 1, FIG. 3 is a sectional view of a swivel head portion, and FIG. 4 is a sectional view taken along line IV-IV of FIG. Is a hydraulic circuit diagram, FIG. 6 is a partial view of the scale, FIG. 7 is an operation flow chart showing an outline of the operation of the automatic feed device of the ground improvement machine, and FIG.
(F) is an explanatory view showing an operation sequence of the chuck when the rod is raised. 1 …… Frame, 2 …… Swivel head body, 3 …… Upper feed hydraulic cylinder, 4 …… Upper feed hydraulic cylinder, 7 …… Hydraulic rod holder, 9 …… Proximity switch box, 10 …… Scale, 11 …… Power control panel, 12 …… Operating panel, 13 …… Hydraulic operating panel

Front page continuation (72) Inventor Katsuhiro Hara 1534 Hara, Karatsu City, Saga Prefecture Yoshida Iron Works Co., Ltd. (56) Reference JP-A-2-236389 (JP, A) JP-A-2-261189 (JP, A) JP 54-28201 (JP, A)

Claims (3)

[Claims] 1. A frame constituting a main body, a first spindle rotatably supported by a first chuck main body, a first chuck means provided on the first spindle for holding and releasing a rod, the first spindle. A second movable member that is movable in the direction of the coaxial line with the first spindle in opposition to the chuck means, and is rotatably supported by the second chuck body so as not to be rotatable by the first spindle.
A spindle; a second chuck means provided on the second spindle for holding and releasing the rod; a chuck rotation driving means for rotationally driving the first spindle and the second spindle; and a first chuck body. First feeding means for driving the rod in the feeding direction with the frame, and second feeding means for driving the second chuck body with the frame in the feeding direction of the rod. And an automatic feed device for a ground improvement machine, which comprises: feed control means for feeding the rod continuously by alternately operating the first and second feed means and the first and second chuck means. 2. The feed control means according to claim 1, wherein the feed control means comprises a scale having continuous scales for detecting the positions of the first and second feed means, and a sensor for detecting the scale. An automatic feed device for ground improvement machines. 3. The automatic ground improvement machine according to claim 2, wherein the scale is a continuous uneven scale, both ends of which are formed higher than the unevenness, and the sensor includes three proximity sensors. Feed device.