JP2007231681A - Auger gearbox - Google Patents

Abstract

An auger transmission capable of shortening the overall length of a drive unit including an auger and a transmission when the transmission is connected and automatically detecting whether or not the transmission is connected is provided. .
An auger transmission 6 is detachably disposed on a reader 7 below the auger 5. An input shaft 6c fitted into the hollow polygonal rotary shaft 5f of the auger 5 is provided on the input side of the transmission 6b, and the auger screw 8 is converted to the output side of the transmission 6b by converting the rotational speed and torque of the rotary shaft 5f. An output shaft 6d is provided for transmission. A sensor 9 for detecting whether or not the auger transmission 6 and the auger 5 are connected is provided.
[Selection] Figure 1

Description

  The present invention relates to an auger transmission, and more particularly, to an auger transmission that is attached below an auger and changes the rotational speed and torque of a rotating shaft of the auger according to a work situation.

  For foundation work such as construction and civil engineering, the auger mounted on the pile driving machine that is the base machine is used to rotate the auger screw, casing, pile and other rotating bodies to excavate the ground, and the pile body is built in the ground There are various methods.

  For example, when excavating soil while excavating soft ground with a screw, large torque is not required, so when excavating hard ground by rotating the screw at high speed and low torque, large torque is required. Therefore, the screw is rotated at a low speed and a high torque so as to obtain a high torque.

In order to be able to perform both operations with one pile driver, when working at high speed and low torque, the screw is directly rotated by the auger, and when working at low speed and high torque, a transmission is connected to the lower part of the auger. In addition, the torque is converted to be high by lowering the rotational speed of the screw (see, for example, Patent Documents 1 and 2).
See Japanese Patent Application Laid-Open No. 2002-21456 See JP 2002-81285 A

  In each of the auger transmissions described above, the output shaft protruding downward from the rotating shaft of the auger and the input shaft protruding upward from the transmission are connected via a coupling or the like. The distance between the auger and the transmission is increased by the necessary dimension for the connecting portion.

  For this reason, since the full length of the drive part which consists of an auger and a transmission device will become long, strokes (construction length), such as a screw, will become short. Also, when transporting the pile driver, the auger is positioned above the leader by the amount of the transmission when the leader is tilted to the top of the pile driver body. The table may interfere. For this reason, it was necessary to remove the transmission device during transportation so that the auger can be lowered to the lower end of the leader.

  In addition, when the auger is provided with a detector for detecting the number of rotations to manage the number of rotations of the rotated body, the number of rotations of the rotated body varies depending on the presence or absence of the transmission. It was necessary to change the setting so that the number of rotations was converted to the actual number of rotations of the rotated object. Further, when a detector for detecting the rotational speed of the output shaft is provided in the transmission, the wiring to the detector must be changed from the auger to the transmission.

  Accordingly, the present invention provides an auger transmission that can reduce the overall length of the drive unit including the auger and the transmission when the transmission is connected, and that can automatically detect whether the transmission is connected. It is intended to provide.

  In order to achieve the above object, the present invention relates to an auger transmission that is detachably attached to a leader below the auger and that converts the rotation speed of the rotating shaft of the auger with a transmission and outputs the same. Provided on the input side is an input shaft that is fitted into a hollow polygonal rotary shaft provided in the auger, and provided on the output side of the transmission is an output shaft that converts and outputs the rotational speed of the rotary shaft In addition, a sensor for detecting the connection between the auger and the transmission is provided.

  By configuring the present invention as described above, the distance between the auger and the transmission can be shortened, so that the construction length when the transmission is used can be made longer than before. Furthermore, even if the leader is tilted with the auger and the transmission installed, the auger does not interfere with the driver's cab of the pile driver body. In addition, by providing a sensor for detecting that the transmission is connected, settings for counting the number of rotations of the rotated body can be automatically switched.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. 1 is a cross-sectional view showing a state in which an auger and an auger transmission are continuously provided, FIG. 2 is a plan view of the auger, and FIG. 3 is an explanatory view showing a working state of a pile driving machine equipped with the auger transmission. 4 is an explanatory diagram showing a transport state of a pile driver equipped with an auger transmission, and FIG. 5 is an explanatory diagram showing a transport state of a standard pile driver.

  The pile driving machine 1 according to this embodiment includes a lower traveling body 2 provided with a crawler and an upper revolving body 3 that is turnably provided on the lower traveling body 2. The top sheave 4 and the auger 5 are mounted, and a leader 7 to which the transmission 6 is detachably attached is provided so as to be raised and lowered.

  The upper swing body 3 has a cab 3b and a power unit including a hydraulic pump or the like on a main frame 3a, and a leader support frame 3c is provided in front. In addition, outriggers 3d are provided at the front and rear of the main frame 3a, respectively.

  A pair of guide rails 7a is laid along the longitudinal direction of the leader 7, and the auger 5 and the transmission 6 are connected to the guide rails 7a through the guide gibs 5a and 6a, respectively, so that they can be raised and lowered. The leader 7 is provided with a chain drive raising / lowering device in which a chain 7b spanned in the longitudinal direction of the leader 7 is rotated by a raising / lowering motor provided in the lower part of the leader, and the auger 5 is connected to the chain 7b.

  The auger 5 includes a motor 5c provided on an upper portion of a mounting portion 5b connected to the guide give 5a, an auger body 5d provided below the motor 5c, and a chuck mechanism 5e provided below the auger body 5d. It has. In the central part of the auger body 5d, a rotary shaft 5f having a hollow hexagonal insertion hole opened up and down is rotatably arranged via bearings 5g and 5g provided above and below. A gear 5h is attached to the outer periphery of the rotating shaft 5f, and the gear 5h meshes with a driving gear 5i of the motor 5c through gears 5k and 5m connected by a rotating shaft 5j, and this connection causes the motor 5c to rotate. It is transmitted to the rotating shaft 5f. The chuck mechanism 5e is formed to be openable and closable, and when in the closed state, the chuck mechanism 5e has an engaging portion 5n that enters a circumferential groove 6f of an input shaft 6c, which will be described later, or a circumferential groove provided on a rod of a rotated body such as a screw. I have.

  The auger transmission 6 includes the guide give 6a, a transmission 6b, an input shaft 6c, and an output shaft 6d. The transmission 6b converts the rotational speed of the rotating shaft 5f of the auger 5 to low rotation and transmits it to the auger screw 8 as a rotated body, and the input shaft fitted into the rotating shaft 5f on the input side. On the output side, the output shaft 6d for connecting the auger screw 8 is fixed coaxially to the output side 6c.

  The input shaft 6c is provided with a hexagonal shaft portion 6e fitted on the inner periphery of the rotating shaft 5f on the tip side, and a circumferential groove 6f engaged with the engaging portion 5n of the chuck mechanism 5e on the lower end portion. Is fixed to the input rotation shaft 6g in the transmission 6b. The output shaft 6d has an upper end fixed to an output rotation shaft 6h in the transmission 6b, and a lower end formed with a connecting portion 6i for connecting the upper end of the rod of the auger screw 8. Further, three pin insertion portions 6s project from the upper portion of the hexagonal shaft portion 6e, and even if the engaging portion 5n of the chuck mechanism 5e is accidentally opened, the auger transmission 6 The fall prevention pin 6u having a flange portion 6t at one end is inserted into the three pin insertion portions 6s, and a retaining pin 6v is attached to the other end of the fall prevention pin 6u.

  A first small gear 6j is fixed to the outer periphery of the input rotation shaft 6g, and a first gear train 6m is constituted by the first small gear 6j and the first large gear 6k meshing with the first small gear 6j. . A second large diameter gear 6n is mounted on the outer periphery of the output rotating shaft 6h inserted on the output side of the transmission 6b, and the second small diameter gear meshes with the second large diameter gear 6n and the second large diameter gear 6n. 6o constitutes a second gear train 6p, and the first large-diameter gear 6k and the second small-diameter gear 6o are connected by a rotating shaft 6q and rotate together. The input rotation shaft 6g and the output rotation shaft 6h are rotatably held by bearings 6r and 6r provided on the upper side and the lower side, respectively, and are meshed and connected by the first gear train 6m and the second gear train 6p. Thus, the driving force of the input rotation shaft 6g is transmitted to the output rotation shaft 6h with the rotational speed decreased and the torque increased by the first and second gear trains 6m and 6p having a predetermined reduction ratio.

  Further, a sensor 9 using a limit switch or the like is attached between the lower surface of the mounting portion 5b of the auger 5 and the upper surface of the transmission 6b, and the sensor 9 connects the reader 7 of the auger transmission 6 with the sensor 9. It is designed to detect the wearing state. The output of the sensor 9 can be used arbitrarily. For example, when the sensor 9 senses the connection of the auger transmission 6 when setting the device for counting the number of rotations of the auger 5, the speed of the transmission 6b is reduced. The setting can be changed so that the rotation number is automatically switched and counted according to the ratio, and can be applied to the management of output torque. Further, when the sensor 9 senses the connection of the auger transmission 6, a confirmation lamp can be lit on the cab 3 b, or the management item can be automatically switched to an item corresponding to each construction method.

  The above-described pile driving machine 1 is equipped with the chuck mechanism 5e by attaching the rod upper end of the auger screw 8 to the rotating shaft 5f of the auger 5 when excavating the soft ground with the auger screw 8 or stirring the ground improvement material. The high-speed, low-torque driving force is supplied to the auger screw 8.

  When excavating a hard ground or press-fitting a steel pipe pile, an auger transmission 6 is attached to the lower portion of the auger 5, and the hexagonal shaft portion 6e of the input shaft 6c is inserted into the insertion hole of the rotating shaft 5f. The engaging portion 5n of the chuck mechanism 5e is inserted into the circumferential groove 6f, and the upper end of the rod of the auger screw 8 is connected to the connecting portion 6i of the output shaft 6d. As a result, the rotation of the rotating shaft 5f increases the torque by reducing the rotation speed by the first and second gear trains 6m and 6p of the transmission 6b, and supplies the auger screw 8 with a driving force of low speed and high torque. Can do.

  At this time, since the input shaft 6c of the auger transmission 6 is directly fitted into the rotation shaft 5f of the auger 5, the distance between the auger 5 and the auger transmission 6 is larger than that when a conventional coupling is used. Since it can be shortened, the stroke of the auger screw 8 can be made longer than before, and the construction length can be sufficiently secured. Further, since the sensor 9 for detecting whether or not the auger transmission 6 is connected to the auger 5 is provided, the rotation speed of the auger screw 8 can be accurately counted without changing the setting or changing the wiring. It becomes possible.

  Further, when the pile driving machine 1 is transported after construction, when the auger transmission 6 is not used, the auger 5 is lowered to the lower part of the leader 7 as shown in FIG. Lay down on top of the. Even when the auger transmission 6 is attached, the distance between the auger 5 and the auger transmission 6 is reduced as shown in FIG. The auger 5 and the driver's cab 3b do not interfere with each other even when lying down on the upper part of the upper swing body 3. Therefore, the pile driving machine 1 can be transported with the auger transmission 6 attached, and the labor of attaching and detaching the auger transmission 6 can be saved.

  In addition, although the auger screw was illustrated as a to-be-rotated body in the above-mentioned form example, the well-known to-be-rotated body used for pile driving machines, such as a casing and a pile, can be mounted | worn as a to-be-rotated body. Further, the transmission may increase speed.

It is sectional drawing which shows the state which connected the auger which shows one example of this invention, and the transmission for augers continuously. It is a top view of an auger similarly. It is explanatory drawing which shows the working state of the pile driver similarly equipped with the transmission for augers. It is explanatory drawing which shows the transport state of the pile driver similarly equipped with the transmission for augers. It is explanatory drawing which shows the transport state of the pile driver of a standard specification similarly.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Pile driver, 2 ... Lower traveling body, 3 ... Upper turning body, 3b ... Driver's cab, 5 ... Auger, 5a ... Guide give, 5b ... Mounting part, 5c ... Motor, 5d ... Auger main body, 5e ... Chuck mechanism, 5f ... rotating shaft, 5g ... bearing, 5h ... gear, 5i ... prime mover gear, 5k, 5m ... gear, 5n ... engaging portion, 6 ... auger transmission, 6a ... guide gib, 6b ... transmission, 6c ... input shaft , 6d ... output shaft, 6e ... hexagonal shaft portion, 6f ... circumferential groove, 6g ... input rotation shaft, 6h ... output rotation shaft, 6i ... connection portion, 6j ... first small diameter gear, 6k ... first large diameter gear , 6m ... first gear train, 6n ... second large gear, 6o ... second small gear, 6p ... second gear train, 6q ... rotating shaft, 6r ... bearing, 7 ... leader, 7a ... guide rail, 7b ... chain, 8 ... auger screw, 9 ... sensor

Claims (2)

An auger transmission that is detachably attached to a leader below the auger and that converts and outputs the rotational speed of the rotation shaft of the auger with a transmission. A hollow provided in the auger on the input side of the transmission An auger transmission comprising: an input shaft fitted into a polygonal rotation shaft; and an output shaft for converting and outputting the rotation speed of the rotation shaft on the output side of the transmission. The auger transmission according to claim 1, further comprising a sensor that senses a connection between the auger and the transmission.

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