JP4869286B2 - Working attachment - Google Patents

Description

  The present invention relates to a work attachment attached to the tip of an arm of a construction machine such as a hydraulic excavator.

  Construction machines such as hydraulic excavators can be used for various applications by exchanging various work attachments such as excavators, hydraulic breakers, lifting magnets, and concrete vibrators at the tip of the arm. At the time of storage), with the work attachment attached to the arm, the work attachment is grounded to the ground and stored integrally with the construction machine main body, or the work attachment is detached from the arm and the construction machine main body And are stored separately.

In addition, in construction machines, work attachments using a vibration isolator may be attached so that vibrations during work are not transmitted to the construction machine main body. This vibration isolator is usually composed of a vibration isolating rubber, a spring, or the like, and is relatively inferior in durability. Therefore, it is not preferable to apply a load to the vibration isolator for a long time.
If a work attachment using such a vibration isolator is stored in contact with the ground, the vibration isolator is loaded for a long time and may be easily damaged.

  In addition, when using a vibration device such as a concrete vibrator as a work tool, the operating status of the vibration device may be checked during maintenance, etc. Since it is not possible to confirm the correct operation, it is necessary to keep it stationary while floating from the ground.

  On the other hand, when the work attachment is detached from the arm and stored separately from the construction machine main body, the work attachment is removed and attached, which takes time and effort.

As a solution to this problem, the applicant has already proposed a concrete placement machine as shown in FIG.
FIG. 13 is a diagram showing the storage state of this concrete placement machine. This concrete placement machine has a base frame 1 to which a concrete vibrator 7 as a work tool is attached via a vibration isolator 8. The rear upper part of the arm joint 2 attached to the upper part is attached to the tip of the arm 9, the front upper part is attached to the hydraulic cylinder 20 via the link 10, and the support stand 4 is provided on the lower surface of the arm 9.
In this concrete placement machine, the tip of the support stand 4 is grounded to support the arm 9 so that the concrete vibrator 7 can be held in a state of being floated from the ground. The load applied to the connecting portion is reduced as much as possible.
Further, since the concrete vibrator 7 can be stored in a state of being floated from the ground, it is possible to confirm the operation by operating only the concrete vibrator 7 without operating the construction machine main body during maintenance or the like.

However, when the engine of the construction machine is stopped, an internal leak occurs in the hydraulic cylinder 20, so that the base frame 1 undergoes a natural descent phenomenon, the storage posture is lost, and the concrete vibrator 7 comes into contact with the ground. May damage this.
Further, when storing using the conventional support stand 4, in order to suppress the occurrence of internal leakage in a plurality of hydraulic cylinders as much as possible, the storage is performed with the two arms fully extended as shown in FIG. And a large storage space must be secured.
Further, in order to attach the support stand 4 to the construction machine, it is necessary to modify the arm 9 of the construction machine, and when the work attachment is replaced with another work attachment (for example, an excavator), the construction The support stand 4 must be removed from the arm 9 so as not to obstruct the operation of the work tool (excavator) during operation of the machine.
“Damulator Vibrator Series Instruction Manual” Exxen Corporation Revised March 2007 p. 29

  This invention can be installed without modifying a general-purpose construction machine, and when the construction machine is stored with the work attachment attached, even when an internal leak occurs in the cylinder, the natural drop phenomenon of the work attachment is suppressed, An object of the present invention is to obtain a work attachment capable of preventing the work tool from contacting the ground.

Working attachment of the present invention is a working attachment that will be mounted on the arm tip of a construction machine such as a hydraulic excavator, the working attachment includes a base frame attached working tool, supported on the said base frame When the base end of the stand is attached and the construction machine is stored with the work attachment attached, the tip of the support stand is grounded to support the base frame, and thus the work attached to the base frame It is comprised so that a tool may not contact the ground.

  The work tools attached to the base frame include various work tools suitable for various work applications such as excavation, gripping, crushing, hanging, traction, suction, compaction, and pressing, such as excavators, breakers, and lifting. A magnet, a concrete vibrator, a vibration joint cutting machine, etc. can be used.

It is preferable that the support stand can be stored in the base frame. If the support stand can be stored in the base frame, it can be stored in the base frame so as not to hinder the work when the construction machine is in operation.
In the present invention, “stored in the base frame” means that the support stand is moved from the working range of the work tool to the extent that it does not hinder the work during operation of the construction machine when the support stand is attached to the base frame. It means being retreated to the side.
As a storage method, for example, a base end portion of a bowl-shaped support stand is rotatably attached to a base frame, and can be fixed at a position along the base frame (Claim 3), or can be expanded and contracted like a telescopic pole. A possible support stand can be attached to the base frame and retracted when not in use, or a hydraulic jack, pantograph jack, etc. can be attached to the base frame and retracted or folded when not in use, etc. It is done.
The storing operation may be performed manually or automatically.

When the support stand has a bowl shape, the base end of the support stand is pivotally attached to the base frame, and can be fixed at a position along the base frame, the support stand has a long hole, Preferably, the support stand is attached to the base frame by inserting a shaft bolt into the elongated hole.
With this configuration, a support stand that is as long as possible can be attached to the base frame.
In the following embodiments, the support stand is attached to the center of the base frame, but a configuration in which one support stand is attached to each side of the base frame is also conceivable.

  When the work tool is a vibration tool, it is preferably attached to the base frame via a vibration isolator (claim 5). As the vibration isolator, a generally used vibration isolator such as an anti-vibration rubber or a spring is adopted.

According to the present invention, since the support stand is attached to the base frame of the work attachment provided with the base frame to which the work tool is attached, when the construction machine is stored with the work attachment attached, the support stand Thus, the base frame can be supported, and even when an internal leak occurs in the cylinder of the construction machine, it is possible to suppress the natural descent phenomenon of the base frame and to prevent the work tool from contacting the ground.
In addition, since the work attachment can be prevented from descending when the internal leakage of the arm cylinder occurs, it can be directly suppressed by the support stand attached directly to the work attachment, so that even when the internal leakage of the cylinder is likely to occur, especially when the arm is bent The arm can be stored at an arbitrary angle. That is, it is not necessary to store with the arm extended forward as in the prior art, and the storage space of the construction machine can be reduced (see FIG. 7).
Furthermore, the construction machine can be provided with a support stand by attaching the work attachment without modifying the construction machine main body.

  If the support stand can be stored in the base frame, the support stand can be stored in the base frame during operation of the construction machine, and the support stand does not interfere with the work.

  In particular, when the work tool is attached to the base frame via an anti-vibration device, it is possible to reliably prevent the grounding of the work tool when the construction machine is not in operation, so the load on the anti-vibration device is reduced, Damage to the vibration isolator can be avoided.

FIG. 1 is a view showing a state where a support stand is set up in the working attachment of the present invention, and FIG. 2 is a view showing a state where the support stand is stored.
On the upper surface of the central portion of the base frame 1 in which a substantially prismatic frame is placed horizontally, a connecting portion 2 connected to the arm tip of the construction machine is provided.
The connecting portion 2 is composed of two side plates 21 and 22 disposed in a direction perpendicular to the longitudinal direction of the base frame 1 with a predetermined interval.

  The front side of the side plates 21 and 22 protrudes from the back side of the base frame 1, and a part of the protruding side plates 21 and 22 extends downward, and the top plate 33 and the support stand are extended to the extended portions 31 and 32. A closing plate 34 for mounting is attached, and the support stand mounting portion 3 is between the closing plate 34 and the side wall of the base frame 1. The side plate extending portions 31 and 32 are open on both sides of the support stand mounting portion 3 so that rotation of the support stand described later is not prevented.

  At the center upper part of the base frame between the side plate extending portions 31 and 32, fixing holes 11 and 12 to which the support stand locking bolts 5 are attached and fixing holes 13 to which the shaft bolts 6 are attached are continuously arranged in a line. Provided (see FIG. 3). The fixing holes 11, 12, and 13 are each provided as a boss hole in which a convex boss is formed in the base frame 1, but may be formed directly in the base frame 1 without providing a boss.

  Insertion holes 341, 342, and 343 are provided at positions corresponding to the fixing holes 11, 12, and 13 of the base frame 1 of the closing plate 34. The insertion holes 341 and 342 are each provided as a boss hole in which a convex boss is formed on the closing plate 34, and a snap pin insertion hole for fixing the locking bolts 5 and 5 is provided on the side wall portion of each boss. It has been.

FIG. 4 is an enlarged view showing the attachment position of the base end of the support stand 4 to the support stand attachment portion 3 with the closing plate 34 removed.
The support stand 4 has a substantially prismatic shape, and a base end portion thereof is formed in a mountain-shaped arc shape, and is provided with insertion holes 41 and 42 through which the locking bolts 5 and 5 are inserted.
A long hole 43 that is long in the longitudinal direction of the support stand is formed immediately below the insertion hole 42. The long hole 43 has such a size that the shaft bolt 6 is positioned at the upper end of the long hole when the support stand 4 is used (in a standing state), and the shaft bolt 6 is positioned at the lower end of the long hole when not used (stored). It is as.
In the attached state of the support stand 4, the insertion holes 41 and 42 correspond to the fixing holes 11 and 12 provided in the base frame 1, respectively, and the upper end position of the long hole 43 corresponds to the fixing hole 13 of the base frame 1. It is located at a position (see FIG. 4).
The top plate 33 has a function as a fixed position restricting plate for preventing the fixing position from being mistaken when the support stand 4 is fixed to the support stand mounting portion 3 using the insertion holes 41 and 42. That is, since the front side of the support stand mounting portion 3 is closed by the closing plate 34, the inner state cannot be visually recognized from the outside. Therefore, when the support stand 4 is fixed, it is not known where the insertion holes 41 and 42 of the support stand 4 are located, so that the positions of the insertion holes 342 and 41 and the fixing hole 12 are mistakenly adjusted or inserted. There is a possibility that the support stand 4 may be fixed in a state where the positions of the holes 341 and 42 and the fixing hole 11 are aligned. By providing the top plate 33, the upward movement of the support stand 4 can be restricted. Therefore, when the support stand 4 is fixed, the support stand 4 is brought into contact with the top plate 33 once to thereby support the support stand 4. The position of the base end portion in the mounting portion 3 can be grasped, and the insertion holes 341 and 41, the fixing hole 11, the insertion holes 342 and 42, and the fixing hole 12 can be positioned correctly and easily without being visible from the outside. Can be done.

  The length of the support stand 4 is set to such a length that the concrete vibrator 7 does not contact the ground in a state where the support stand 4 is erected and grounded. An insertion hole 44 through which the locking bolt 5 is inserted when the support stand is stored is provided at the lower end of the support stand 4.

The base end portion of the support stand 4 is fitted into the support stand mounting portion 3, and the shaft bolt 6 is inserted into the long hole 43 of the support stand 4 through the insertion hole 343 of the closing plate 34 to fix the base frame 1. It is attached to the hole 13. The shaft bolt 6 is always attached, and functions as a rotation shaft when the support stand 4 is rotated when the support stand 4 is stored and taken out.
The locking bolts 5 and 5 are inserted into the insertion holes 41 and 42 of the support stand 4 through the insertion holes 341 and 342 of the closing plate 34, respectively, and the tips thereof are fitted into the fixing holes 11 and 12. . The locking bolts 5, 5 are formed with screws at their tips, but no screws are formed in the fixing holes 11, 12. In this state, the locking bolts 5, 5 are in the fixing holes 11, 12. It is not fixed. Therefore, snap pin insertion holes 51 and 51 are provided at the base end portions of the locking bolts 5 and 5, respectively, and the positions and insertion holes of the snap pin insertion holes 51 and 51 are inserted in the state where the locking bolts 5 and 5 are inserted. The locking bolts 5 and 5 are temporarily fixed to the closing plate 34 by matching the positions of the snap pin insertion holes 341 and 342 and inserting the snap pins 53 and 53. In consideration of the fact that the locking bolts can be easily attached and detached in a short time, screws are formed on the inner walls of the fixing holes 11 and 12, and the screws at the tips of the locking bolts 5 and 5 are screwed into the screws. The locking bolts 5 and 5 and the base frame 1 may be fixed by combining them. When the locking bolts 5 and 5 and the base frame 1 are fixed by screwing, the snap pin 53 is not necessary.

  On the front surface of the base frame 1, four concrete vibrators 7 as work tools are fixed to the base frame 1 at equal intervals through vibration isolation devices 8. In this embodiment, a concrete vibrator is used as a work tool, but a vibration jointing machine or other work tool can be attached depending on the work purpose. Moreover, the number of concrete vibrators to be attached is not limited to four, and an appropriate number can be attached at an appropriate interval according to the purpose of use and the state of use.

  Fixing holes 14 and 15 for fixing the support stand 4 using the locking bolts 5 and 5 when the support stand 4 is housed are provided on the back surface of the base frame 1. The fixing holes 14 and 15 are provided as boss holes in the base frame 1 in which convex bosses having the same height as the fixing holes 11, 12 and 13 are formed. When the fixing holes 11, 12, 13 are provided directly in the base frame 1 without being formed as boss holes, the fixing holes 14, 15 may also be formed directly in the base frame 1 without providing bosses. And the screw | thread screwed together with the screw | thread of a locking bolt is formed in the inner wall of the fixing holes 14 and 15. FIG.

  In the figure, reference numeral 16 denotes a stopper for restricting the rotation range of the support stand during the storage operation of the support stand 4, and reference numeral 17 similarly denotes a slide of the support stand 4 in the longitudinal direction of the base frame 1 during the storage operation of the support stand 4. It is a guide for easily performing. The guide 17 is not particularly required when the fixing holes 11 to 15 are not formed as boss holes but directly formed in the base frame 1.

By supporting the base frame 1 with the support stand 4 upright, it is possible to prevent the concrete vibrator 7 from coming into contact with the ground, to reduce the load applied to the vibration isolator 8 and also during maintenance. The operation confirmation can be performed only by operating the concrete vibrator 7 without operating the construction machine main body.
Further, since the lowering of the work attachment due to the internal leak of the cylinder can be directly suppressed by the support stand 4 attached to the base frame 1, it is not necessary to extend the arm forward in consideration of the internal leak of the cylinder. The arm can be stored even in a bent state, and the storage space for the construction machine can be reduced.

FIG. 6 is a schematic diagram for explaining a method of storing the support stand 4. It should be noted that the closing plate 34 is shown in a state where it is removed so that the structure of the support stand mounting portion 3 can be easily understood.
When the support stand 4 is stored, first, the locking bolts 5 and 5 are removed. Next, the support stand 4 is rotated 90 degrees to the left with the shaft bolt 6 in the state positioned at the upper end of the long hole 43 as the rotation axis, along the longitudinal direction of the base frame 1. At this time, since the stopper 16L is provided in the base frame 1, the rotatable range of the support stand 4 is restricted, and the support frame 4 does not rotate upward than 90 degrees.

After making the support stand 4 parallel to the base frame 1, the support stand 4 is slid rightward using the long hole 43 as a guide. When the support stand 4 is slid to the lower end of the long hole 43, the insertion hole 44 of the support stand 4 and the fixing hole 14L formed in the base frame 1 and the insertion hole 42 and the fixing hole 15R are aligned. ing. Therefore, if the support stand 4 is slid along the long hole 43 to the lower end thereof, the positioning of the insertion hole of the support stand 4 and the fixing hole of the base frame 1 can be easily adjusted. In order to increase the length of the support stand 4, for example, when the support stand 4 is stored, the shaft bolt 6 can be used when the position of the insertion hole 42 of the support stand matches the position of the fixing hole 14 </ b> R of the base frame 1. If the long hole is formed in such a length that is positioned at the lower end of the long hole 43, a support stand that is longer by the length of the long hole 43 can be attached.
When the support stand 4 is slid, a guide 17R having the same height as the boss height of the fixing hole 15R is provided between the fixing hole 15R of the base frame 1 and the side wall 32 of the stand mounting portion 3. When the stand 4 is slid to the right, the tip can be smoothly slid without contacting the boss of the fixing hole 15R.

When the positions of the insertion hole 44 and the fixing hole 14L, and the insertion hole 42 and the fixing hole 15R are aligned, the removed locking bolts 5 and 5 are attached, and the support stand 4 is fixed to the base frame 1. At this time, in order to prevent the locking bolts 5 and 5 from being detached from the base frame 1 due to vibrations generated when the construction machine is used, the locking bolts 5 and 5 and the fixing holes 14L and 15R are fixed to each member. This is performed by screwing a screw formed at the tip of the set bolt and a screw formed on the inner wall of each fixing hole.
Thereby, the support stand 4 can be stored in the base frame 1 so as not to obstruct the work when the construction machine is operated.

  The fixing holes 14 and 15, the stopper 16, and the guide 17 provided in the base frame 1 are provided in symmetrical positions so that the support stand 4 can be stored in the base frame 1 on either the left or right side ( In the figure, R is attached to those arranged on the right side and L is attached to those arranged on the left side).

  When the support stand 4 is taken out from the state stored in the base frame 1 (the support stand 4 is erected), the reverse procedure to the above may be performed.

FIG. 7 is a view showing a storage state during non-operation when a work attachment of the present invention is mounted on a general-purpose construction machine such as a hydraulic excavator.
The tip of the arm 9 of the construction machine is rotatably attached to the arm attachment hole 27 provided on the upper rear surface side of the work attachment connecting portion 2, and the link attachment hole 28 provided on the upper front side of the connection portion 2 is attached. One end of the link 10 is rotatably attached. A hydraulic cylinder 20 is rotatably connected to the other end of the link 10, and the other end of a support link 30 having one end rotatably attached to the arm 9 at this connecting portion is also connected. With this configuration, the work attachment can be rotated in the front-rear direction by the expansion and contraction of the hydraulic cylinder 20.
When storing the construction machine, the arm 9 is bent downward, the support stand 4 is grounded, and the base frame 1 of the work attachment is supported, so that an internal leak occurs in the hydraulic cylinder 20 Even so, there is no possibility that the base frame 1 will cause a natural descent phenomenon, and there is no possibility that the concrete vibrator 7 will be damaged by contact with the ground, or that the vibration isolator will be loaded and damaged.
In addition, since the work attachment can be prevented from descending when a cylinder internal leak occurs with the support stand directly attached to the work attachment, it can be stored even when the cylinder is susceptible to internal leakage, especially when the arm is bent. The arm can be stored at an arbitrary angle, and the storage space for the construction machine can be reduced.
Since the support stand 4 is provided on the base frame 1 of the work attachment, the construction machine can be provided with the support stand only by mounting the work attachment without modifying the construction machine main body.

In this embodiment, the support stand 4 has a bowl shape and the storage / removal operation is performed manually. However, the support stand 4 can be an extendable stand such as an extendable pole. The storage / removal operation can be automatically performed by using a motor, a hydraulic device, or the like.
When a hydraulic jack is used as the support stand 4, it can be configured as shown in FIGS. In this case, since the support stand can be housed by expansion and contraction of the rod of the hydraulic jack, it is not necessary to pivotally attach the base end portion of the hydraulic jack to the base frame 1, but the length of the rod of the hydraulic jack to be used. For example, when the work using a work tool is hindered, the base end of the hydraulic jack is pivotally attached to the base frame 1, and the hydraulic jack with the rod contracted is rotated along the base frame 1. It is good also as what fixes to the closed position (FIG. 10).

Further, in this embodiment, when the support stand 4 is used (in the standing state), the fixing to the support stand mounting portion 3 is performed by inserting the locking bolt 5 into the insertion holes 341 and 41 and the fixing hole 11 and the insertion hole. 342, 42, and the fixing bolt 12 are inserted into the fixing hole 12. However, a chevron-shaped stopper plate 35 is provided below the top plate 33 of the support stand mounting portion 3, and the chevron-shaped support is provided. If it fits into the stand 4 base end part, it is not necessary to fix using the locking bolt 5 (FIG. 11).
Alternatively, as shown in FIG. 12, a locking hole 45 is provided on the upper surface of the base end portion of the support stand 4, a hole is also provided in the top plate 33, and a locking pin P is inserted from above the top plate to fix the support stand 4. It is good to do.

  The present invention relates to a work attachment attached to the tip of an arm of a construction machine such as a hydraulic excavator, and has industrial applicability.

The figure which shows the state which stood the support stand of the work attachment of this invention The figure which shows the state which stored the support stand similarly Similarly the enlarged view which shows the structure by the side of the base frame 1 of a support stand attachment part Similarly the enlarged view which shows the attachment position of the support stand base end to the support stand attachment part in the state which removed the obstruction board Similarly, an enlarged perspective view showing the mounting state of the support stand base end to the support stand mounting portion with the closing plate attached Schematic diagram for explaining how to store the support stand The figure which shows the storage state of the construction machine with which the work attachment of this invention was mounted | worn The figure which shows the accommodation state of the support stand in the Example at the time of using a hydraulic jack as a support stand. The figure which shows the state where the support stand was raised similarly The figure which similarly shows the rotation state of a support stand Enlarged view of the support stand mounting part in the embodiment when a stopper plate is provided under the top plate (the closing plate is omitted) Enlarged view of the support stand mounting portion in the embodiment in which the locking pin is inserted from the top plate to fix the support stand (the closing plate is omitted) The figure which shows the storage state of the conventional construction machine

Explanation of symbols

1 Base frame 11, 12, 13 Fixing hole 14L, 14R, 15L, 15R Fixing hole 16L, 16R Stopper 17L, 17R Guide 2 Connection part 21, 22 Side plate 27 Arm attachment hole 28 Link attachment hole 3 Support stand attachment part 31, 32 Side plate extension 33 Top plate 34 Closure plates 341, 342 Insertion hole 4 Support stands 41, 42, 44 Insertion hole 43 Long hole 5 Locking bolt 51 Snap pin insertion hole 53 Snap pin 6 Axle bolt 7 Concrete vibrator 8 Vibration isolation Device 9 Arm 10 Link 20 Hydraulic cylinder 30 Support link

Claims (5)

A work attachment attached to the tip of an arm of a construction machine such as a hydraulic excavator,
The work attachment includes a base frame to which a work tool is attached,
A base end of a support stand is attached to the base frame,
When storing the construction machine with the work attachment attached, the tip of the support stand is grounded to support the base frame, so that the work tool attached to the base frame does not come into contact with the ground. ,
Work attachment.
The work attachment according to claim 1, wherein the support stand is storable in the base frame. The work attachment according to claim 2, wherein the support stand has a bowl shape, a base end portion of the support stand is rotatably attached to a base frame, and can be fixed at a position along the base frame. The work attachment according to claim 3, wherein the support stand has a long hole in a longitudinal direction thereof, and a shaft bolt is inserted into the long hole to attach the support stand to a base frame. The work attachment according to any one of claims 1 to 4, wherein the work tool is a vibration tool attached to a base frame via a vibration isolator.

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