JP5988858B2 - Pile driver - Google Patents

Description

  The present invention relates to a pile driving machine, and more particularly, to a pile driving machine provided with a rearward-type leader that is brought into a transport state by lowering the leader above a base machine.

  As shown in FIG. 9 and FIG. 10, as a pile driving machine, the lower part of the leader 1 is supported by a leader arm 3 provided at the front part of the base machine 2 so as to be swingable in the front-rear direction. In addition, it is formed so as to be supported by the backstay 5 from the rear part of the base machine 2 via a slide holder 4 provided so as to be movable along the leader 1, and the leader 1 during transportation is supported at the rear part of the base machine 2 A pile driver equipped with a rearward-type leader provided with a rear support cylinder 6 is known.

  In the working state, as shown in FIG. 9, the pile driver rotates the tip of the leader arm 3 to the rear side (upward) to support the lower portion of the leader 1 and slide-locks the slide holder 4 (see FIG. 9). The upper portion of the reader 1 is supported by the backstay 5 while being fixed to the reader 1 with a backstay 5 in a state where the reader 1 is erected in the vertical direction. In the transport state, as shown in FIG. The tip of 3 is rotated to the front side (downward) to support the lower part of the reader 1, and the reader 1 is tilted backward and supported by a rear support cylinder 6 provided on the rear side of the base machine 2. 1 is placed in a horizontal state after being laid down. In this rearward state, the slide lock is released and the slide holder 4 is movable along the reader 1 (see, for example, Patent Document 1).

JP 2009-228220 A (FIG. 1)

  The pile driving machine equipped with the backward-type leader can adjust the position of the leader 1 in the front-rear direction by turning the leader arm 3 in the working state and turning the tip in the front-rear direction. However, if the tip of the leader arm 3 is largely rotated forward, the weight balance in the front-rear direction may be lost and the pile driver may be tilted forward. In order to prevent this, a lock member for restricting the rotation range of the leader arm 3 is provided so that the tip of the leader arm 3 does not rotate largely forward. However, since the conventional lock member raises the leader from the transport state to the working state, the operator manually attaches the lock member to a predetermined position to regulate the rotation range of the leader arm 3. If forgetting to install the lock member for some reason, the leader arm 3 may excessively rotate to the front side during the positioning operation of the leader 1 and the pile driver may be inclined. In addition, since the lock member has to be removed when changing from the working state to the transport state, handling of the lock member is a burden on the operator.

  Therefore, an object of the present invention is to provide a pile driving machine having a safety structure that can automatically regulate the rotation range of a leader arm in a working state by omitting a lock member.

  In order to achieve the above object, the pile driving machine of the present invention includes a leader arm having a base portion pivotally attached to the front portion of a base machine and a tip portion swingable in the front-rear direction, and the leader arm in the front-rear direction. A front cylinder that swings to the front, a reader that is pivotally supported by the tip of the leader arm and that can be raised and lowered in the front-rear direction, a slide holder that is movable along the rear side of the leader, A slide lock for fixing the slide holder to a preset position on the rear side of the reader, slide lock detecting means for detecting a state in which the slide lock fixes the slide holder to the reader, and a base portion on the rear side of the base machine In a pile driving machine comprising a reverse-type leader having a back stay that is pivotally attached and has a back end coupled to the slide holder, the slide lock detecting hand However, when the slide lock detects a state in which the slide holder is fixed to the reader, the rotation angle of the reader arm is restricted within a range of a rotation restriction angle set in advance from the rear end rotation angle, When the slide lock does not detect the state in which the slide holder is fixed to the reader, the reader arm rotation angle restriction that allows the rotation angle of the leader arm to be rotated from the rear end rotation angle to the front end rotation angle. It is characterized by having means.

  Further, in the pile driving machine of the present invention, the leader arm rotation angle restricting means includes a front cylinder expansion / contraction switch for extending / contracting the front cylinder, and the rotation angle of the leader arm is determined from the rear end rotation angle. The extension direction of the front cylinder expansion / contraction switch when the extension direction of the front cylinder expansion / contraction switch is energized within a range up to the rotation restriction angle and the rotation angle of the leader arm exceeds a preset rotation angle. When the slide arm is in a state where the slide lock does not fix the slide holder to the reader, the extension direction of the front cylinder expansion / contraction switch is made energizable, and the slide lock When the slide holder is fixed to the reader, And a slide lock state detection switch to the non-conductive state extension direction of Rontoshirinda stretchable switch, shortening direction in the front cylinder stretchable switch is characterized by being kept always energized state.

  According to the pile driving machine of the present invention, in a state where the slide lock is fixed to the reader, that is, in a working state, the rotation angle of the leader arm is set to a rotation restriction angle set in advance from the rear end rotation angle. Since it can be regulated within the range, it can be prevented that the leader arm rotates excessively to the front side during work and the pile driving machine tilts, and when shifting from the work state to the transport state, When the slide holder is unlocked by the slide lock, the leader arm can be rotated from the rear end rotation angle to the front end rotation angle, so that the reader arm and the rear support cylinder are placed in a state where the reader is laid horizontally. can do. Therefore, since there is no need to use a conventional locking member, the burden on the operator can be reduced and the work can proceed safely.

It is a side view of the pile driver of the working state which shows one example of this invention. It is a side view of a pile driver similarly in a transportation state. It is side surface sectional drawing of the principal part which shows the part of a slide lock. It is the cross-sectional top view of the principal part similarly. It is a side view of the principal part which shows the part of a leader arm. It is a front view of the principal part similarly. It is VII-VII sectional drawing of FIG. It is an electric circuit diagram which shows an example of a leader arm rotation angle control means. It is a side view of the working state which shows an example of the pile driving machine provided with the reverse type leader. It is a side view of a transportation state similarly.

  1 to 8 show an example of a pile driving machine according to the present invention. The pile driving machine 11 shown in this embodiment is a lower traveling body provided with a crawler as shown in FIGS. 1 and 2. 12 and a base machine 14 having an upper swing body 13 that is swingably provided on the lower traveling body 12, a leader arm 15 that is swingably movable in the front-rear direction at the front of the upper swing body 13, A leader 16 provided at the front end of the leader arm 15 so as to be able to undulate in the front-rear direction, a pair of left and right backstays 17 that support the leader 16 that has been set up in the working state from the rear side of the base machine 14, and rearward in the transported state And a rear support cylinder 18 that supports the fallen leader 16 from below on the rear side of the base machine 14. Further, a front jack 19 and a rear jack 20 are provided at the front and rear portions of the upper swing body, respectively.

  A pair of guide rails 16 a are provided on the upper rear surface side of the reader 16 to guide the slide holder 21, to which the upper end of the backstay 17 is coupled, so as to be movable along the rear side of the reader 16. The slide holder 21 is provided with a slide lock 22 for fixing the slide holder 21 to a preset position of the reader 16.

  As shown in FIGS. 3 and 4, the slide holder 21 covers a substrate 23b having a pair of sliders 23a slidably engaged with the pair of guide rails 16a, and a rear side of the substrate 23b. A case portion 23 having a rear wall 23c provided in this manner, a stay bracket 24 provided on both side portions of the case portion 23, and a rear sheave bracket 25 provided on the upper portion of the case portion 23. The slide lock 22 is accommodated in the portion 23.

  The slide lock 22 is provided with a lock pin 26 guided by a guide cylinder 23d provided on the substrate 23b, and the lock pin 26 provided at a preset position on the rear side of the reader 16 via a link 27a. A lock cylinder 27 that moves in an axial direction between an engagement position and a non-engagement position with respect to the lock hole 16b, a coil spring 28 that urges the lock pin 26 in a direction to engage with the lock hole 16b, and the lock pin 26 is provided with a slide lock limit switch 29 which is a slide lock detecting means for detecting that 26 is engaged with the lock hole 16b.

  Further, the rear wall 23c is provided with a through hole 23e through which an indicator 26a provided at the outer end of the lock pin 26 can pass outward. The indicator 26a has a lock pin 26 in the lock hole 16b. The slide holder 21 is positioned on the inside of the through hole 23e in a state where the slide holder 21 is fixed to the reader 16, and the lock pin 26 is not engaged with the lock hole 16b, and the slide holder 21 can move along the reader 16. In such a state, it is formed so as to largely protrude from the through hole 23e and be visible from the outside.

  As shown in FIGS. 5 to 7, the leader arm 15 can be pivoted in the front-rear direction by a pivot shaft 13 b in the pile driver width direction on an arm bracket 13 a having a base portion 15 a provided on the upper swing body 13. The lower end of the reader 16 is pivotally supported by the support shaft 16c at the front end portion 15b of the reader arm 15 so that the reader 16 can be raised and lowered in the front-rear direction. A cylinder bracket 13c provided on the rear side of the arm bracket 13a is attached with a base portion of a front cylinder 30 for swinging the leader arm 15 in the front-rear direction. Is connected to the intermediate portion of the reader arm 15. Therefore, by extending the front cylinder 30, the leader arm 15 is rotated so that the front end portion 15b moves to the front side, and by shortening the front cylinder 30, the front end portion 15b moves to the rear side. The leader arm 15 is formed so as to rotate.

  The arm bracket 13 a and the reader arm 15 are provided with a rotation angle detection means 31 for detecting the rotation angle of the reader arm 15. The rotation angle detection means 31 includes a leader arm limit switch 31a provided on the arm bracket 13a and a limit switch contact portion 31b provided on the leader arm 15, and the rotation angle of the leader arm 15 is determined. When the rotation restriction angle 15G preset between the rear end rotation angle 15E and the front end rotation angle 15F is exceeded, the operator of the reader arm limit switch 31a contacts the limit switch contact portion 31b. Thus, the leader arm limit switch 31a is configured to operate.

  As shown in FIG. 8, the front cylinder expansion switch 51 for extending and retracting the front cylinder 30 for rotating the leader arm 15 via an electromagnetic control valve has a rotation angle restriction functioning as a leader arm rotation angle restriction means. An electrical circuit 52 is provided. The front cylinder expansion / contraction switch 51 includes a shortening-side switch 51a that is always energized between a battery 53a serving as a power source and a ground 53b, and ON / OFF of a leader arm limit switch 31a of the rotation angle detection means 31. The extension side connected between the battery 53a and the ground 53b via the reader arm relay contact 54 that operates at the ON and OFF and the slide lock relay contact 55 that operates when the slide lock limit switch 29 that is a slide lock state detection switch is turned ON / OFF. A switch 51b is provided.

  The leader arm relay contact 54 is turned OFF when the leader arm 15 is rotated beyond a preset turning regulation angle 15G and the leader arm limit switch 31a is operated, and the extension side switch 51b is not energized. Then, even if the extension side switch 51b is operated, the front cylinder 30 is extended so that the leader arm 15 cannot be rotated forward. On the other hand, when the leader arm 15 is turned between the turning restriction angle 15G and the rear end turning angle 15E and the leader arm limit switch 31a is inactive, the leader arm relay contact 54 is turned on (FIG. 8). In this state, the extension side switch 51b is energized. By operating the extension side switch 51b, the front cylinder 30 is extended so that the leader arm 15 can be rotated forward. Operate.

  Further, the slide lock relay contact 55 is provided when the slide lock limit switch 29 that is a slide lock state detection switch is in an inoperative state, that is, the lock pin 26 is not engaged with the lock hole 16b, and the slide holder 21 is the leader. 16 is turned on when it is movable along the state 16 (the state shown in FIG. 8), the extension side switch 51b is in a state where electricity can be applied, the front cylinder 30 is extended, and the leader arm 15 is directed forward. It will be in the state which can be rotated.

  When the lock pin 26 engages with the lock hole 16b and the slide holder 21 is fixed to the reader 16, and the slide lock limit switch 29 is activated, the slide lock relay contact 55 is turned off, so that the extension side switch 51b is not turned on. Even if the extension side switch 51b is operated, the front cylinder 30 cannot be extended and the leader arm 15 cannot be rotated forward.

  Further, a lighting circuit 57 for lighting a pilot lamp 56 indicating that the slide holder 21 is fixed to the reader 16 is provided at the slide lock relay contact 55 in the electric circuit 52 for restricting the rotation angle shown in this embodiment. When the slide lock limit switch 29 is activated and the circuit on the extension side switch 51b side of the slide lock relay contact 55 is turned off, the lighting circuit 57 is turned on and the pilot lamp 56 is turned on. Yes.

  The operation when the pile driving machine having the leader arm rotation angle restriction means including the rotation angle restriction electric circuit 52 is changed from the transport state shown in FIG. 2 to the work state shown in FIG. 1 will be described. In this transported state, the lock cylinder 27 is extended, the lock pin 26 is not engaged with the lock hole 16b, the slide holder 21 is movable along the leader 16, and the leader arm 15 is at the front end. It is in the state rotated to the rotation angle 15F. Therefore, when the slide lock limit switch 29 is inactive, the circuit on the extension side switch 51b side of the slide lock relay contact 55 is ON, and when the leader arm limit switch 31a is in operation, the leader arm relay contact 54 is OFF. ing.

  In this transport state, the rear support cylinder 18 is extended to raise the upper side of the leader 16, and the front cylinder 30 is shortened by operating the shortening side switch 51a in which the front cylinder expansion / contraction switch 51 is always energized. Then, the reader arm 15 is rotated backward. As a result, the upper side of the reader 16 rotates upward, and the reader 16 moves upward in the axial direction, so that the slide holder 21 is guided by the guide rail 16a and slides toward the lower side of the reader 16, and the lock pin When the coil 26 can be engaged with the lock hole 16b, the lock pin 26 is engaged with the lock hole 16b by the action of the coil spring 28, the slide holder 21 is fixed to the reader 16, and the slide lock limit The switch 29 is activated, and the circuit on the extension side switch 51b side of the slide lock relay contact 55 is turned off. At the same time, the lighting circuit 57 is turned on and the pilot lamp 56 is lit. Further, when the leader arm 15 is rotated rearward and the rotation angle of the leader arm 15 is between the rotation restriction angle 15G and the rear end rotation angle 15E, the reader arm limit switch 31a is not activated. Then, the reader arm relay contact 54 is turned ON.

  When the backstay 17 is extended while the slide holder 21 is fixed to the reader 16, the reader 16 stands up and the working state shown in FIG. In this working state, since the leader arm relay contact 54 is ON, the leader arm 15 can be turned in the front-rear direction between the rear end turning angle 15E and the turning restriction angle 15G. Can be aligned in the front-rear direction of the reader 16. When the leader arm 15 is turned forward by operating the extension side switch 51b, if the turning angle of the leader arm 15 exceeds the turning restriction angle 15G, the leader arm limit switch 31a is activated and the leader arm relay is operated. Since the contact 54 is turned off and the extension side switch 51b is in a non-energized state, the front cylinder 30 does not extend even if the extension side switch 51b is operated, and the leader arm 15 moves forward beyond the rotation restriction angle 15G. It is automatically controlled to rotate. Further, since the pilot lamp 56 is lit, it can be confirmed that the operation of rotating the leader arm 15 largely forward is restricted.

  Thereby, the gravity center of the pile driver 11 can be largely moved to the front side, and an accident in which the pile driver 11 is inclined forward can be prevented. At this time, since the shortening side switch 51a is always in an energizable state, the rotation angle of the leader arm 15 is rotated by operating the shortening side switch 51a to rotate the leader arm 15 toward the rear side. It can be returned between the movement restriction angle 15G and the rear end rotation angle 15E.

  When the pile driving machine 11 is changed from the working state shown in FIG. 1 to the transport state shown in FIG. 2, first, the back stay 17 is shortened and the leader 16 is tilted backward, and the upper side of the leader 16 is moved to the rear support cylinder. 18, the lock cylinder 27 is extended, the lock pin 26 is extracted from the lock hole 16 b, the lock is released, and the slide holder 21 is movable along the reader 16. As a result, the slide lock limit switch 29 is deactivated, the circuit on the extension side switch 51b side of the slide lock relay contact 55 is turned on, and the extension side switch 51b can be energized, and the pilot lamp 56 is turned off. To do.

  Therefore, by operating the extension-side switch 51b, the leader arm 15 can be turned to the front end turning angle 15F beyond the turning restriction angle 15G, so that the leader arm 15 can be turned forward. By moving the rear support cylinder 18 while moving it, the leader 16 can be tilted toward the rear of the pile driving machine 11 and put in a transport state laid down in the horizontal direction.

  In this way, the pile driving machine is operated during work by regulating the rotation range of the leader arm 15 based on the state of the lock pin 26 that fixes the slide holder 21 to the reader 16 and the rotation angle of the leader arm 15. 11 can surely prevent accidents that tilt forward, and since it does not require the insertion and removal of locking members as in the past, the burden on the operator can be reduced, greatly increasing the safety and workability of pile driving work. Can be improved.

  In addition, the structure of each part of a pile driver is not limited to this embodiment, The present invention can be applied to a pile driver of various structures provided with a reverse-type leader. For example, the rotation angle of the leader arm can be set as appropriate according to the size of the pile driver and the like. Also, the configuration of the electrical circuit for regulating the rotation angle is arbitrary, and the forward rotation of the leader arm is mechanically performed by a cylinder that automatically operates according to the detection state of the detection means such as a limit switch and various sensors. It is also possible to regulate. The pilot lamp circuit may be a separate circuit.

  DESCRIPTION OF SYMBOLS 11 ... Pile driver, 12 ... Lower traveling body, 13 ... Upper turning body, 13a ... Arm bracket, 13b ... Rotating shaft, 13c ... Cylinder bracket, 14 ... Base machine, 15 ... Leader arm, 15a ... Base, 15b ... Front end portion, 15E ... rear end rotation angle, 15F ... front end rotation angle, 15G ... rotation restriction angle, 16 ... leader, 16a ... guide rail, 16b ... lock hole, 16c ... support shaft, 17 ... backstay, 18 ... rear support cylinder, 19 ... front jack, 20 ... rear jack, 21 ... slide holder, 22 ... slide lock, 23 ... case part, 23a ... slider, 23b ... substrate, 23c ... rear wall, 23d ... guide tube, 23e ... Through hole, 24 ... Stay bracket, 25 ... Rear sheave bracket, 26 ... Lock pin, 26a ... Indicator, 27 ... Lock cylinder 27a ... link, 28 ... coil spring, 29 ... slide lock limit switch, 30 ... front cylinder, 31 ... rotation angle detection means, 31a ... leader arm limit switch, 31b ... limit switch contact part, 51 ... front cylinder expansion / contraction Switch, 51a ... Short side switch, 51b ... Extension side switch, 52 ... Electric circuit for regulating rotation angle, 53a ... Battery, 53b ... Ground, 54 ... Leader arm relay contact, 55 ... Slide lock relay contact, 56 ... Pilot lamp 57 ... Lighting circuit

Claims (2)

  A leader arm whose base is pivotally attached to the front of the base machine and whose tip is swingable in the front-rear direction, a front cylinder that swings the leader arm in the front-rear direction, and a tip of the leader arm A reader that is pivotally supported and can be raised and lowered in the front-rear direction, a slide holder that is movable along the rear side of the reader, and the slide holder is fixed at a predetermined position on the rear side of the reader A slide lock; a slide lock detecting means for detecting a state in which the slide lock fixes the slide holder to the reader; and a back having a base portion pivotally attached to the rear side of the base machine and a tip portion connected to the slide holder. In a pile driving machine including a rearward-type leader having a stay, the slide lock detecting means is configured so that the slide lock holds the slide holder. When the state fixed to the encoder is detected, the rotation angle of the leader arm is regulated within a range of a rotation regulation angle set in advance from the rear end rotation angle, and the slide lock holds the slide holder. A pile driving mechanism comprising leader arm rotation angle regulating means for allowing the leader arm to rotate from a rear end rotation angle to a front end rotation angle when a state of being fixed to the leader is not detected. Machine.   The leader arm rotation angle restricting means includes a front cylinder expansion / contraction switch for extending / contracting the front cylinder, and a rotation angle of the leader arm within a range from the rear end rotation angle to the rotation restriction angle. Leader arm rotation in which the extension direction of the front cylinder expansion / contraction switch is energized and the extension direction of the front cylinder expansion / contraction switch is de-energized when the rotation angle of the leader arm exceeds a preset rotation angle When the angle detection switch and the slide lock are in a state where the slide holder is not fixed to the reader, the extension direction in the front cylinder expansion / contraction switch is set to be energized, and the slide lock is in a state where the slide holder is fixed to the reader. Sometimes the front cylinder telescopic switch And a slide lock state detection switch to the extending direction with a non-energized state in, pile driver according to claim 1, wherein the reducing direction in the front cylinder stretchable switch is characterized in that it is always kept energized state.

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