JP2015010443A - Attachment storage device for work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately and easily fit a stay according to a deviation in boom/arm distance due to a manufacture error while absorbing the deviation and to prevent an arm from descending after the stay is fitted.SOLUTION: A stay 23 is fitted between a boom 5 and an arm 9 in an arm storage attitude while tilting in an arm rotating direction, and the arm 9 is stored and fixed. The stay 23 has both boom-side and arm-side fitting parts 23a, 23b, and while the boom-side fitting part 23a is fitted to a boom-side bracket 21 rotatably around a stay support shaft 24, the arm-side fitting part 23b is fitted detachably and adjustable in position through a long hole 27 provided in an arm-side bracket 22 and long in an arm length direction, and has its position fixed at an optimum position by a stopper member 30.

Description

  The present invention relates to an attachment storage device for fixing to a boom in a retracted state in which an arm is folded to the lower surface side of a boom in a work machine such as a dismantling machine configured by attaching a work attachment including a boom and an arm to a base machine. It is.

  The background art will be described by taking as an example a dismantling machine with an ultra-long attachment used for dismantling high-rise structures.

  As shown in FIG. 7, this demolition machine is a self-propelled and swivel base machine 3 comprising a crawler-type lower traveling body 1 and an upper revolving body 2 that is pivotably mounted on the lower traveling body 1. And the attachment A for work is attached.

  The attachment A includes a boom 5 attached to the upper swing body 2 so as to be able to move up and down around the boom foot pin 4, and a boom point pin at the tip of the boom 5 (the horizontal axis in the horizontal direction; the same applies to the following pins). A short inter-boom 7 that is pivotably mounted around 6, an arm 9 that is pivotally mounted around the arm mounting pin 8 at the tip of the inter-boom 7, and is attached to the tip of the arm 9 A working device (not shown) such as a bucket or a crusher is provided as an attachment constituent member.

  The boom 5 is not actually a single object as shown in the figure, but is configured by adding and connecting a plurality of front booms to the main boom attached to the upper swing body 2. Since it is not directly related to the invention, it is illustrated and described as a single object.

  Further, as a hydraulic cylinder for operating the attachment A, a boom cylinder 10 for raising and lowering the boom 5, an inter boom cylinder 11 for rotating the inter boom 7, an arm cylinder 12 for rotating the arm 9, and a working device are rotated. A working device cylinder 13 to be moved is provided. Reference numeral 14 denotes a link mechanism that converts the thrust of the working device cylinder 13 to the working device by converting it into turning power.

  The arm 9 is extended from the tip of the boom 5 (precisely, the tip of the inter boom 7) during operation by the expansion and contraction operation of the arm cylinder 12, and is folded to the bottom surface of the boom during assembly / disassembly.

  FIG. 7 shows a state in which the entire attachment A is tilted in the arm folded state, and an operation for assembling or disassembling the attachment is performed in this state.

  Although not shown, the boom 5 is supported by a stand placed on the ground in this state.

  Hereinafter, the state of FIG. 7 is referred to as an attachment storage state, and the posture of the arm 9 in this state is referred to as an arm storage posture. In addition, “upper and lower” and “left and right” for each part described below follow the directionality of FIGS. 7 and 8, and “left and right” are the length directions of the boom 5 and the arm 9.

  The arm 9 is fixed to the boom 5 by stays 15 on both sides in the width direction in the arm retracted posture.

  The structure of the stay 15 and its mounting structure are shown enlarged in FIG.

  As shown in the figure, the stay 15 is formed in a link shape having boom-side and arm-side mounting portions 15a and 15b at both ends, and both boom-side and arm-side brackets 16 and 17 projecting from the bottom and top surfaces of the boom, respectively. The two attachment portions 15a and 15b are attached to the brackets 16 and 17 by the boom-side and arm-side attachment pins 18 and 19 in a state of being bridged in a vertical posture.

  Here, since manufacturing errors occur in the dimensions of the boom 5, the arm 9, and the arm cylinder 12, the distance D between the boom 5 and the arm 9 in the arm retracted position (hereinafter referred to as a storage distance) D is a design value. There is a possibility that the stay 15 cannot be attached due to displacement to a larger or smaller side.

  Therefore, conventionally, as shown in FIG. 8, a long slot 20 is provided vertically on the arm side mounting portion 15 b of the stay 15, and the mounting portion 15 b and the arm side bracket 17 are mounted with the arm side mounting pin 19 through the long hole 20. Thus, the above-described deviation can be absorbed.

  Further, as another technique for absorbing the shift of the storage distance D, the arm-side bracket 17 is detachably attached to the arm 9 via a shim, and a technique for dealing with the shift by shim adjustment (Patent Document 1), In addition, a technique (see Patent Document 2) is known in which the stay 15 is configured to be adjustable in length in a turnbuckle manner by two screw shafts and female screw members that are reversely threaded.

Japanese Utility Model Publication No. 64-37559 Japanese Utility Model Publication No. 64-53253

  According to the prior art shown in FIGS. 7 and 8, the shift of the storage distance D can be absorbed by the long hole 20, but the arm 9 is not fixed in the long hole 20, so that the arm 9 is moved over time. There is a possibility of natural descent due to its own weight. That is, the lowering of the arm 9 cannot be prevented.

  Here, in an ultra-long attachment or the like, there is a case in which the hydraulic cylinder and the like are separated from the base machine 3 and stored and transported in the retracted state. As a result, the pressure in the pipe rises, and it becomes difficult to connect the pipe when the attachment A is attached to the base machine 3 next time.

  On the other hand, according to the technology of Patent Document 1 (the shim method), the arm-side weight can be prevented from dropping by fixing the storage distance in the stay mounted state. On the other hand, when the stay is mounted, the arm side bracket 17 is temporarily removed and the number of shims is calculated. The procedure for re-installation after increasing / decreasing has to be performed, and the adjustment work is extremely troublesome and time-consuming. In addition, since adjustment can be performed only in the thickness unit of the shim, there is a possibility that accurate adjustment cannot be performed.

  According to the technique of Patent Document 2 (turnbuckle method), since the stay 15 is configured as a three-member turnbuckle, the length of the stay is inevitably increased, and the request for reducing the storage distance D as much as possible can be met. There may not be.

  Further, the cost of the stay 15 is greatly increased because the stay 15 is composed of three members and the strength of the screws that can withstand the weight of the arm is required.

  Furthermore, when adjusting the length of the stay 15, the screwing amount becomes excessive, and an excessive load is applied to the boom 5, the arm 9, the arm cylinder 12, and the like, which may cause damage.

  Therefore, the present invention is based on the premise that the stay is configured as a single object, and the stay can be easily and accurately attached in accordance with the shift while absorbing the shift in the storage time distance due to the manufacturing error. It is an object of the present invention to provide an attachment storage device for a work machine that can reliably prevent the arm from being lowered after the stay is attached.

  As means for solving the above-mentioned problems, in the present invention, a boom attached to the base machine and an arm attached to the tip of the boom so as to be rotatable around a horizontal arm attachment pin are provided as attachment components. The arm can be changed between an overhanging posture that projects from the tip of the boom and a retracted posture that is folded to the lower surface side of the boom by the expansion and contraction operation of the hydraulic cylinder, and between the boom and the arm in the retracted posture. In the attachment storage device of the work machine fixed by the stay spanned over, the following requirements (i) to (v) are satisfied.

  (i) One end of the stay is attached to one attachment constituent member of the boom and the arm so as to be rotatable around a horizontal stay support shaft.

  (ii) The other attachment component member is provided with a bracket having a long hole in the length direction of the member.

  (iii) With the stay retracted posture, the other end of the stay is attached to the bracket by a stay fixing pin that is movable and detachably inserted in the length direction of the elongated hole.

  (iv) The stay is pivoted about the stay support shaft and absorbs the deviation with respect to a deviation from a design value of the distance between the boom and the arm in the arm retracted position. It was constructed so as to be bridged between the boom and the arm while being inclined with respect to the rotation direction of the arm around the mounting pin.

  (v) having stopper means for receiving a load acting on the stay fixing pin by its own weight when the other end of the stay is attached to the bracket and preventing the stay fixing pin from moving in the elongated hole; about.

  According to this configuration, even if the storage distance deviates from the design value due to a manufacturing error, the deviation can be absorbed by the change in the stay angle due to the long hole. That is, the stay can be easily and accurately attached to the shift without performing a special position adjustment work like the shim adjustment method.

  In this case, since the stay is tilted with respect to the arm rotation direction, it is attached between the boom and the arm. Therefore, the storage distance is shifted both when the storage distance is shifted to the larger side than the design value and when it is shifted to the smaller side. Can be absorbed.

  In addition, since the movement of the stay due to the weight of the arm after the stay is attached can be prevented by the stopper means, the weight of the arm can be reliably prevented from dropping, and the pressure in the hydraulic pipe can be prevented from rising due to the arm being lowered.

  In this case, since the elongated hole of the bracket is provided substantially orthogonal to the arm length direction, that is, the direction in which the arm's own weight acts, the load applied to the stopper means is much smaller than the own weight load. For this reason, the movement of the stay can be reliably prevented with a small stopper means.

  Moreover, since the stay is composed of a single member and can be attached simply by pinning both ends of the stay to the boom side and arm side, the stay length can be shortened compared to the turnbuckle type stay, and at the time of storage Do not apply a load that reduces the distance. For this reason, there is no possibility of applying an excessive load to each member such as a boom, an arm, and a hydraulic cylinder.

  In the present invention, the arm posture when the hydraulic cylinder is contracted to the stroke end is the arm retracted posture, and the stay is attached in the arm retracted posture with the stay tilted with respect to the arm rotation direction. Thus, it is desirable to set the distance between the centers of the stay support shaft and the stay fixing pin.

  The center-to-center distance between the stay spindle and the stay fixing pin is set based on the storage distance, but if the arm storage posture, which is the reference for the setting, differs for each storage operation, the storage distance also varies regardless of manufacturing errors. However, there is a possibility that the stay cannot be attached or the stay cannot absorb the displacement.

  In this regard, according to the configuration of the second aspect, the center-to-center distance is set on the basis of the arm retracted posture (the retracted distance) in the cylinder most contracted state, and thus there is no possibility that the inconvenience as described above occurs.

  In the present invention, a stopper member for receiving a load acting on the stay fixing pin by the weight of the arm is attached to the bracket in a state where the position of the stopper can be adjusted in the length direction of the elongated hole to constitute the stopper means. (Claims 3 and 4).

  When the stopper member is configured by attaching the stopper member to the bracket, if the stopper member position is determined and attached during the first storage operation, this will be the optimum position to absorb the deviation, so basically the next storage operation Sometimes it is not necessary to move from this position, and it is theoretically possible to fix it by semi-permanent fixing means such as welding.

  However, since there is a possibility that the distance between the boom and the arm may change due to looseness due to secular change, the stopper member is attached so that the position of the stopper member can be adjusted in the length direction of the long hole as in the third and fourth aspects of the invention. The optimum position can be ensured corresponding to the fluctuation of the storage distance.

  In this case, it is desirable that the stopper member is attached to the bracket with a bolt passed through the elongated hole in a state in which the stopper member abuts against the other end of the stay and receives a load acting on the stay fixing pin. .

  According to this configuration, since the elongated hole for attaching the stay is also used as the means for attaching the stopper member, it is not necessary to provide an extra bolt hole, which contributes to the simplification and compactness of the structure.

  According to the present invention, on the premise that the stay is configured as a single object, the stay can be easily and accurately attached in accordance with the shift while absorbing the shift in the storage time distance due to the manufacturing error. The arm can be reliably prevented from falling after the stay is attached.

It is a side view which shows the storage apparatus which concerns on embodiment of this invention. It is the II-II line expanded sectional view of FIG. It is the III-III line expanded sectional view of FIG. (a) is a diagram schematically showing the state of the stay when the storage distance is as designed, and (b) is a diagram schematically showing the state of the stay when the storage distance is larger than the design value. It is a side view which shows the action condition of the arm's own weight with respect to a stay, and its component force. FIG. 3 is a view corresponding to FIG. 1 showing another embodiment of the present invention. It is a schematic side view of the attachment storage state in the dismantling machine with a super-long attachment which is an example to which the present invention is applied. FIG. 8 is an enlarged view of a portion surrounded by a broken line in FIG. 7.

  An embodiment of the present invention will be described with reference to FIGS.

  The embodiment is applied to a dismantling machine with a super long attachment shown in FIG.

  In the embodiment, the configuration of the entire attachment excluding the storage device is the same as that of the prior art shown in FIGS. 7 and 8, and FIG. 1 corresponds to FIG.

  As shown in FIGS. 1 to 3, a boom side bracket 21 and an arm side bracket 22 are provided opposite to each other on the lower surface of the boom 5 and the upper surface of the arm 9 in the storage state of the attachment, respectively. , 22, the stay 23 is bridged between the arms 9 and the arm 9 is fixed in the retracted position.

  The brackets 21 and 22 and the stay 23 may be provided only in the center portion in the width direction of the boom 5 and the arm 9, but are normally provided symmetrically on both sides in the width direction as in the prior art. Only one side is shown in the figure.

  The stay 23 is formed in a link shape having both boom-side and arm-side attachment portions 23 a and 23 b at both ends, and the boom-side attachment portion 23 a can rotate around the stay support shaft 24 at the left end portion of the boom-side bracket 21. Installed on.

  Further, pin holes 25 and 26 are provided in the right end portion of the boom-side bracket 21 and the arm-side mounting portion 23b of the stay 23, respectively. When the stay 23 is not used (other than when the attachment is stored), the stay 23 is shown in FIG. When the storage pin (not shown) is inserted into the corresponding pin holes 25 and 26 in the state of being stored along the bottom surface of the boom (boom side bracket 21) as shown by the middle two-dot chain line, the stay 23 is fixed in the stored state. The

  The arm-side bracket 22 is provided with a long slot 27 that is long in the left-right direction (arm length direction). In the arm retracted position, the stay fixing pin 28 is inserted across the slot 27 and the pin hole 26 of the stay 23. Is done.

  In FIG. 2, reference numeral 29 denotes a retaining pin inserted through the tip of the stay fixing pin 28. For simplification of the drawing, the retaining pin 29 is not shown in FIG.

  In this way, the stay 23 can be turned left and right about the stay support shaft 24, and the arm side attachment portion 23 b can be attached to the arm side bracket 22 while being movable in the left and right direction and detachable.

  In this case, as shown in FIGS. 1, 4 and 5, the stay 23 rotates the arm 9 around the arm mounting pin 8 in FIG. 7, that is, the descending direction of the arm 9 due to its own weight (in FIG. 1). It is bridged between the boom 5 and the arm 9 (between the brackets 21 and 22 on both sides) in a state tilted to the left with respect to a double line arrow.

  Here, the stay support shaft 24 and the stay fixing pin 28 are arranged so that the stay 23 can be tilted and mounted in the retracted position of the arm when the arm cylinder 12 shown in FIG. A center-to-center distance L (see FIG. 4) is set.

  4A shows the case where there is no deviation of the storage distance D due to an error, and FIG. 4B shows the case where the deviation α occurs. In FIG. 4A, the inclination angle of the stay 23 when there is no deviation of X. In FIG. 4B, Y is the inclination angle of the stay 23 when the shift α occurs.

  On the other hand, FIG. 5 shows how the load is applied in the stay mounting state, and the arm self-weight load F1 acts on the stay fixing pin 28 in the downward direction, and the load in the length direction of the stay (axial force) as its component force. ) F2 and a load F3 in a direction orthogonal thereto are applied.

  Of these, the stay fixing pin 28 tends to move to the left in the elongated hole 27 due to the load F3, so that the arm 9 is lowered as it is.

  Therefore, a stopper member 30 is provided as a stopper means that receives the load F3 acting on the stay fixing pin 28 and prevents the stay fixing pin 28 from moving in the elongated hole 27.

  The stopper member 30 is formed in a disc shape, and is in contact with the arm side mounting portion 23b of the stay 23 on the circumferential side of each other and receives the load F3. It is attached to the bracket 22 so that it can be attached and detached and its position can be adjusted in the long hole length direction.

  According to this attachment storage device, even if the storage distance D deviates from the design value due to a manufacturing error, the misalignment can be absorbed by the change in the angle of the stay 23 due to the long hole 27 shown in FIG. That is, the stay 23 can be easily and accurately attached to the shift without performing a special position adjustment operation like the shim adjustment method.

  In this case, since the stay 23 is attached between the boom 5 and the arm 9 in a state tilted with respect to the arm rotation direction, the storage distance D is shifted to a larger side than the design value and to a smaller side. Both can absorb the deviation.

  Moreover, since the movement of the stay 23 due to the weight of the arm can be prevented by the stopper member 30 after the stay is attached, the arm 9 does not descend, and the pressure in the hydraulic pipe can be prevented from rising.

  In this case, since the elongated hole 27 of the arm side bracket 22 is provided substantially orthogonal to the arm length direction, that is, the direction in which the arm's own weight acts, the load applied to the stopper member 30 is the own weight load F1 shown in FIG. Much smaller than. For this reason, the movement of the stay 23 can be reliably prevented by the small stopper member 30.

  In addition, the stay 23 can be manufactured at a low cost by a single member, and can be attached simply by pinning both ends of the stay 23 to the boom side and the arm side, so the stay length is shorter than that of a turnbuckle type stay. it can. Further, since there is no possibility of applying a load in the direction of shortening the retracted distance D unlike a turnbuckle type stay, there is a possibility of applying an extra load to each member such as the boom 5, the arm 9, and the arm cylinder 12 in FIG. There is no.

  Moreover, according to this storage device, the following effects can be obtained.

  (a) A stay support shaft 24 and a stay fixing pin so that the stay 23 can be mounted in a state where the arm 23 is tilted with respect to the arm rotation direction in the retracted position of the arm when the arm cylinder 12 is contracted to the stroke end. Since the center-to-center distance L is set to 28, the storage distance D fluctuates for each arm storage operation regardless of manufacturing errors, so that the stay 23 cannot be attached or the stay 23 can absorb the displacement. There is no risk of losing.

  (b) Since the stopper member 30 for receiving the load acting on the stay fixing pin 28 due to the weight of the arm 9 is attached to the arm side bracket 22 in a state in which the position can be adjusted in the length direction of the long hole 27, the secular change Even when the storage distance D changes due to looseness or the like, the position of the stopper member 30 is adjusted in the long hole length direction, so that the optimum position can be secured in response to the change in the storage distance D.

  (c) The stopper member 30 is attached to the arm side bracket 22 by the bolt 31 passed through the elongated hole 27 in a state where the stopper member 30 is in contact with the arm side attaching portion 23b of the stay 23 and receives the load acting on the stay fixing pin 28. In other words, since the elongated hole 27 for attaching the arm side attachment portion 23b of the stay 23 to the arm side bracket 22 is also used as the attachment means of the stopper member 30, there is no need to provide an extra bolt hole, and the structure is simplified. Contributes to downsizing.

Other embodiments
(1) As shown in FIG. 6, the stay 23 may be attached between the boom side and arm side brackets 21 and 22 in a state of tilting to the right opposite to the above embodiment.

  In this case, the stopper member 30 is provided on the right side of the arm side mounting portion 23 b of the stay 23.

  Or you may make it attach the stay 23 between both bracket 23a, 23b in the state rotated about the arm side attaching part 23b side.

  In this case, the stay support shaft 24 is attached to the lower side (arm side bracket 22), and the stay fixing pin 28 and the stopper member 30 are attached to the upper side (boom side bracket 21).

  (2) As described above, if the stopper member 30 is positioned and attached at the time of the first storing operation, it becomes an optimum position for absorbing the deviation and basically does not need to be moved. Therefore, when there is no possibility of play due to secular change, or when play is not a problem in practice, it may be fixed to the optimum position by welding or the like.

  In this case, the stopper member 30 is not necessarily required to have a disk shape as in the above-described embodiment, and is not necessarily provided on the elongated hole 27.

A Attachment 1 Lower traveling body 2 Upper turning body 3 Base machine 5 Boom 7 Inter boom 8 Arm mounting pin 9 Arm D Storage time 12 Arm cylinder 23 Stay 23a Stay boom side mounting section 23b Stay arm side mounting section 24 Stay support Axis 27 Long hole 28 Stay fixing pin L Distance between center of stay support shaft and stay fixing pin 30 Stopper member 31 Bolt for attaching the stopper member 32 Same nut

Claims (4)

A boom that is attached to the base machine and an arm that is rotatably attached to the tip of the boom around a horizontal arm attachment pin are provided as attachment components. It is possible to change the posture between an overhanging posture protruding from the tip and a retracted posture folded on the lower surface side of the boom, and a working machine fixed by a stay spanned between the boom and the arm in the retracted posture. An attachment storage device for a work machine, characterized in that the attachment storage device has all the following requirements (i) to (v):
(i) One end of the stay is attached to one attachment constituent member of the boom and the arm so as to be rotatable around a horizontal stay support shaft.
(ii) The other attachment component member is provided with a bracket having a long hole in the length direction of the member.
(iii) With the stay retracted posture, the other end of the stay is attached to the bracket by a stay fixing pin that is movable and detachably inserted in the length direction of the elongated hole.
(iv) The stay is pivoted about the stay support shaft and absorbs the deviation with respect to a deviation from a design value of the distance between the boom and the arm in the arm retracted position. It was constructed so as to be bridged between the boom and the arm while being inclined with respect to the rotation direction of the arm around the mounting pin.
(v) having stopper means for receiving a load acting on the stay fixing pin by its own weight when the other end of the stay is attached to the bracket and preventing the stay fixing pin from moving in the elongated hole; about.   The center of the stay support shaft and the stay fixing pin is arranged so that the stay is tilted with respect to the arm rotation direction in the retracted position of the arm when the hydraulic cylinder is reduced to the stroke end. The attachment storage device for a work machine according to claim 1, wherein an inter-distance is set.   A stopper member configured to receive a load acting on the stay fixing pin by its own weight is attached to the bracket in a state in which the position of the stopper can be adjusted in the length direction of the elongated hole to constitute the stopper means. Item 3. The working machine attachment storage device according to Item 1 or 2.   The said stopper member is attached to the said bracket with the volt | bolt which passed through the said elongate hole in the state which contact | abuts the other end part of the said stay, and receives the load which acts on a stay fixing pin. Attachment storage device for work machines.

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