JP2009249822A - Swing attachment for power shovel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a swing attachment for a power shovel with a pivotable bucket and a pivotable gripping claw enabling the easy maintenance and inspection of a hydraulic unit attached thereto while being attached to the arm of a power shovel. <P>SOLUTION: A U-shaped frame 31 formed of a downward U-shaped bent plate is so welded to the upper surface of a base plate 11 to which the swing bearing 12 of the swing attachment 1 is secured as to close the front and rear surfaces and the upper surface of a hydraulic unit storage space 32. A mounting plate 34 having a connection pin hole for connecting to the power shovel is welded to the lateral both sides of the upper surface of the U-shaped frame. The mounting plate 34 and the U-shaped frame 31 are reinforcement members for transmitting a working force acting on the attachment 1 and an external force to the end of the arm 41 of the power shovel. The hydraulic unit 2 is contained in the space surrounded by the base plate 11 and the U-shaped frame 31. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an attachment for a power shovel such as a bucket or a gripping claw device attached to the tip of an arm of a power shovel, and in particular, crosses the bucket or the gripping claw device with its swing shaft (generally crossing at right angles). The present invention relates to the attachment provided so as to be able to turn around an axis.

  Power excavators are used for various purposes such as excavation of earth and sand, dismantling of buildings, transport of building materials and building waste (for example, loading into trucks). An attachment suitable for each work such as a bucket, a gripping claw, and a breaker is attached to the tip of the arm of the excavator according to these uses. These attachments are mounted at two locations on the excavator arm tip and front link tip via connecting pins (swing center pin and front pin), and the front link of the bucket cylinder provided on the arm is attached. As the head advances and retreats, the whole swings around the swing center pin at the tip of the arm.

  An attachment that does not require a swiveling motion is configured to swing at the end of the arm by the bucket cylinder. The swing operation at this time is a swing operation around a horizontal axis orthogonal to the longitudinal direction of the arm, and the swing direction is determined by the direction of the arm. An attachment (swivel type attachment) provided with a swivel device is used for work that requires an operation of directing the bucket or the gripping claw in a direction different from the direction of the arm. As an example in which the attachment needs to be swung, for example, there is an operation of gripping an elongated wood and loading it onto a truck. In this operation, it is necessary to swing the gripping claw in a direction perpendicular to the extending direction of the wood on the ground and the longitudinal direction of the truck bed regardless of the direction of the arm of the power shovel.

  In the swing type attachment, the bucket and the gripping claw cannot be swung by the bucket cylinder on the power shovel side. Therefore, the hydraulic unit for swinging these, the hydraulic motor for swing, and the hydraulic unit including these switching valves Must be provided on the attachment side.

  An example of a conventional structure of a swivel attachment provided with such a hydraulic unit is shown in FIG. The swivel attachment shown in FIG. 4 is a gripping claw device used for conveying wood, and includes two connecting pin holes 35 and 36 on the upper surface of a circular substrate 11 to which the outer ring of the swivel bearing 12 is fixed. A mounting plate (mounting bracket) is erected by welding the base side to the upper surface of the circular substrate 11 with an internal dimension corresponding to the width of the arm 41 of the power shovel (the dimension in the direction perpendicular to the drawing sheet). Yes. A swivel base 13 is fixed to the inner ring of the swivel bearing 12, and two pivot plates 14 pivotally supporting the base ends of the pair of grip claws 16, 16 on the swivel base have a width of the grip claws 16 (the drawing surface of the drawing). Are welded at an internal spacing equivalent to the dimension in the perpendicular direction). The base ends of the pair of gripping claws 16, 16 are connected to each other by an opening / closing cylinder 23 and a synchronization link 17 disposed between the two pivot plates 14. The open / close cylinder 23 opens and closes the grip claws 16 and 16 by its forward / backward movement, and the synchronization link 17 synchronizes the open / close operations of the pair of grip claws 16 and 16.

  Although not shown in the figure, the swivel base 13 is provided with an internal gear centered on the swivel center and fixed to the output shaft of the hydraulic motor 21 (see FIG. 1) mounted on the circular substrate 11. A pinion meshes with the internal gear. A piping unit 22 (see FIG. 2) including this turning hydraulic motor and a switching valve for switching the rotation stop of the hydraulic motor and the forward / backward movement of the opening / closing cylinder 23 is fixed to the upper surface of the circular substrate 11 and attached to two mounting plates. 3 is accommodated. That is, most of the hydraulic system such as the hydraulic motor 21 and the piping unit 22 provided in the swivel attachment 1 and the hydraulic piping that connects them, and the electrical system that controls the hydraulic system are composed of two mounting plates 3. It is mounted in the space between.

  Such a swivel attachment 1 swings around the swing center pin 43 at the tip of the arm 41 by the swing center pin 43 at the tip of the arm 41 of the power shovel and the front pin 44 at the tip of the front link 42. The piping unit 22 is freely mounted, and is connected to a hydraulic oil pipe piped along the boom and arm 41 of a power shovel by a hydraulic hose. Although not shown in the figure, an electric cable for opening and closing the switching valve in the piping unit is also arranged between the arm 41 and the attachment 1 so as not to disturb the swinging operation of the attachment 1. Yes.

  The hydraulic system that operates the swivel attachment and the electrical system that controls the operation have weaker resistance to external force and vibration than the attachment main body, and include components that have low durability. For this reason, there are many cases where it is necessary to repair or inspect the hydraulic system or electric system.

  When it is necessary to check or repair the hydraulic system or electrical system of the attachment while the attachment is mounted on the excavator, the conventional structure as shown in FIG. 4 is arranged between the two mounting plates 3. There is a problem that the operator's accessibility to the hydraulic system and electrical system (hereinafter referred to as “hydraulic unit”) is poor and inspection and repair are difficult. That is, two sturdy mounting plates 3 for mounting the attachment 1 to the arm 41 of the excavator are provided on both side surfaces of the space in which the hydraulic unit is accommodated. Since the connecting pins 43 and 44, the sturdy arm 41 and the front link 42 are present, the hydraulic unit is inspected and repaired between the two mounting plates 3 from the left or right side of FIG. Absent. However, the left and right portions in FIG. 4 have poor gripper 16 because of the gripping claw 16 below, and the left and right opening portions in the drawing between the two mounting plates have a small opening area. Further, an arm 41 is provided on the upper right side of the mounting plate 3 in the figure, and the operator's head is supported. Therefore, there is a trouble that the attachment 1 must be removed from the arm 41 of the power shovel when performing maintenance and inspection of the hydraulic unit built in the attachment 1.

  The present invention has been made to solve such problems, and it is easier to perform maintenance and inspection of the hydraulic unit provided in the attachment while the swivel attachment is attached to the arm of the excavator. It is an object to provide a technical means to enable it.

  In this invention, the side of the storage space 32 of the hydraulic unit 2 above the substrate 11 to which the slewing bearing 12 of the slewing attachment 1 is fixed, that is, both sides of the arm 41 when the slewing attachment 1 is mounted on the arm 41 of the power shovel. The above-mentioned problem is solved by adopting a structure in which the surface to be opened can be opened. That is, the above-described problem is solved by adopting a structure that allows the attachment to be mounted on the arm 41 of the excavator without providing strength members on both side surfaces of the storage space 32 of the hydraulic unit 2.

  In the present invention, the front and rear surfaces (the left and right surfaces in FIG. 4) of the hydraulic unit storage space 32 are formed on the upper surface of the substrate 11 (the rear surface of the surface on which the swivel bearing 12 is fixed) on which the swivel bearing 12 of the swivel attachment 1 is fixed. ) And both ends 31a and 31b of a U-shaped frame 31 made of a plate material bent in a U-shaped downward direction so as to close the upper surface, and connecting pins to a power shovel on both sides in the width direction of the upper surface of the U-shaped frame. A mounting plate 34 having holes 35 and 36 is welded. The mounting plate 34 and the U-shaped frame 31 are strength members that transmit working force and external force acting on the attachment 1 to the tip of the arm 41 of the power shovel. The hydraulic unit 2 is accommodated in a space surrounded by the substrate 11 and the U-shaped frame 31, and the open side surfaces of the U-shaped frame 31 are thinly fixed to the both sides of the U-shaped frame 31 with screws 37. It is closed with a side cover 33 (not bearing strength). The attachment of the swivel base 13 to the swivel bearing 12 and the attachment of the bucket and the gripping claws 16 to the pivot plate 14 fixed to the swivel base 13 are the same as those of the swivel attachment having the conventional structure.

  The swivel attachment for a power shovel according to the invention of claim 1 of the present application includes a substrate 11 and a swivel mounted on the lower surface side of the substrate so as to be rotatable about a rotation axis perpendicular to the surface of the substrate 1. 13, a bucket or gripping claw 16 pivoted by a pivot shaft 15 that intersects the pivot shaft at right angles and a base end thereof, and a substrate 1 for connecting the substrate 1 to the tip of an arm 41 of a power shovel. In a swivel attachment for a power shovel provided with a pair of mounting plates 34 provided with two connecting pin holes 35, 36, a U-shaped frame 31 having both sides welded to the upper surface of the substrate, and the U-shaped frame A hydraulic unit including the mounting plate 34 whose bases are welded to both sides of 31, a hydraulic motor 21 and a hydraulic piping unit 22 housed in a space between the substrate 1 and the U-shaped frame 31. And the U-shaped frame 31 and the mounting plate 34 are strength bearing members that transmit working force or external force acting on the attachment to the arm 41. It is an attachment.

  The swivel attachment for a power shovel according to the invention of claim 2 of the present application is a swivel attachment provided with the above means, and is screwed to a side portion of the U-shaped frame 31 so as to be disposed on both sides of the U-shaped frame 31. A detachable side cover 33 for closing the side opening is provided.

  The swivel attachment for a power shovel according to claim 3 of the present application is a swivel attachment provided with the above-mentioned means, and is mounted on the substrate 1 via the swivel bearing 12 so as to be swivel around the swivel axis. Two pivot plates 14 welded to the swivel base 13 to support the pivot shaft 15 and the buckets or gripping claws 16 pivoted on the pivot shaft are swung or opened / closed. In a revolving attachment in which the cylinder 23 that swings or opens and closes is disposed between the two pivot plates, an opening 38 provided in the pivot plate 14 and a peripheral edge of the attachment plate This is a revolving attachment characterized in that it is provided with a detachable cover plate 39 that is screwed to the opening to close the opening.

  According to the present invention, it is possible to easily perform maintenance and inspection of the piping unit and the hydraulic actuator of the swivel attachment incorporating the piping unit, the hydraulic motor and other hydraulic actuators while the attachment is attached to the power shovel. become. That is, if the side cover 33 of the U-shaped frame 31 is removed, both side surfaces of the storage space 32 of the hydraulic unit 2 are greatly opened, and the operator can approach both side portions on both the power shovel side and the attachment side. There is no member that prevents this. Therefore, if the side cover 33 is removed in a state where the attachment is faced downward (position where the gripping claws and buckets are below the substrate 11) and the attachment is lowered to the ground, the operator can easily perform maintenance and inspection of the hydraulic unit 2. be able to.

  Further, an opening 38 and a removable cover plate 39 for closing the opening are provided on the mounting plate 34 that pivotally supports the bucket and the gripping claws, thereby swinging or opening / closing between the two mounting plates 34. The maintenance inspection of the cylinder and the piping for the same can be performed in the same posture as the maintenance inspection of the hydraulic unit 2.

  Therefore, according to the present invention, there is an effect that maintenance and inspection of the hydraulic system and electrical system of the attachment can be easily performed with the swivel attachment attached to the power shovel.

  Hereinafter, the present invention will be further described with reference to FIGS. 1 to 3 showing an embodiment of the present invention. The attachment shown in FIGS. 1 to 3 is a gripping claw device used for transporting wood similar to the attachment of FIG.

  The attachment 1 includes a circular substrate 11 as in the conventional apparatus of FIG. The slewing bearing 12 that rotatably supports the gripping claws 16 is attached with its outer ring fixed to the substrate 11, and a slewing base 13 is fixed to the inner ring. On the swivel base 13, two pivot plates 14 having an opening at the center are fixedly installed by welding their base sides 14a. The pivot shaft 15 that pivotally supports the gripping claw 16 is supported at both ends by two pivot plates 14. The gripping claw 16 is pivotally supported on the pivot shaft 15 with its base end inserted between the two pivot plates 14.

  The base ends of the pair of gripping claws 16, 16 are connected to each other by an opening / closing cylinder 23 and a synchronization link 17 disposed between the two pivot plates 14. The open / close cylinder 23 opens and closes the grip claws 16 and 16 by its forward / backward movement, and the synchronization link 17 synchronizes the open / close operations of the pair of grip claws 16 and 16.

  The swivel base 13 is provided with an internal gear 27 whose center is the swivel center, and a pinion 26 fixed to the output shaft of the hydraulic motor 21 mounted on the circular substrate 11 meshes with the internal gear 27. . A piping unit 22 including a switching valve for switching rotation stop of the hydraulic motor 21 and advance / retreat of the open / close cylinder 23 is fixed to the upper surface of the circular substrate 11 adjacent to the hydraulic motor 21. A hydraulic hose 24 connects the piping unit 22 and the hydraulic motor 21, and a hydraulic hose 25 connects the piping unit 22 and the open / close cylinder 23.

  Such a swivel attachment 1 swings around the swing center pin 43 at the tip of the arm 41 by the swing center pin 43 at the tip of the arm 41 of the power shovel and the front pin 44 at the tip of the front link 42. The piping unit 22 is freely mounted, and is connected to a hydraulic oil pipe piped along the boom and arm 41 of a power shovel by a hydraulic hose. Although not shown in the figure, an electric cable for opening and closing the switching valve in the piping unit is also arranged between the arm 41 and the attachment 1 so as not to disturb the swinging operation of the attachment 1. Yes.

  On the upper surface of the substrate 11, both sides of a U-shaped frame 31 formed by bending a steel plate having a thickness of 16 mm and a width of 368 mm (in the case of an attachment having a maximum transport weight of 1,300 kg) into a U-shape by pressing are welded. The hydraulic motor 21 and the piping unit 22 described above are accommodated in a space 32 surrounded by the substrate 11 and the U-shaped frame 31. Both open side surfaces of the U-shaped frame 31 are closed by side covers 33 that are screwed around the sides of the U-shaped frame 31. The two mounting plates 34 provided with the connecting pin holes 35, 36 connected to the power shovel have a base 34 a extending over the U-shaped frame 31, and the bases are on both sides of the U-shaped frame 31. It is welded to the part.

  That is, in the attachment according to the present invention, the external force acting on the bucket and the gripping claws 16 is transmitted to the tip of the arm of the excavator via the slewing bearing 12, the substrate 11, the U-shaped frame 31 and the mounting plate 34. The U-shaped frame 31 is a member that has sufficient strength and rigidity to withstand this external force and that is widely open on both side surfaces.

  The pivot plate 14 that pivotally supports the gripping claw 16 is provided with an opening 38 at the center thereof. This opening is closed by a cover plate 39 whose periphery is screwed to the pivot plate 14.

  When performing maintenance and inspection of the hydraulic motor 21, the piping unit 22, the hydraulic hose 24 connecting them, and the electrical system that controls them, the arm 41 is lowered and grasped while the attachment 1 is mounted on the power shovel. The nail | claw 16 is dropped on the ground and a power shovel is stopped. Then, the side covers 33 on both sides (or one side in some cases) of the U-shaped frame 31 are removed, and the internal hydraulic unit 2 is inspected for maintenance. When the maintenance inspection of the open / close cylinder 23 and the hydraulic hose 25 connecting the open / close cylinder 23 to the piping unit 22 is performed, the cover plate 39 of the mounting plate 34 is removed. The bucket or gripping claw attached to the arm 41 or the attachment of the power shovel does not have a protruding part to the side, so that the operator's hydraulic unit 2 with the side cover 33 and the cover plate 39 removed. The accessibility to the vehicle is good, and maintenance and inspection of hydraulic systems and electrical systems and replacement of parts can be easily performed.

The side view which removed the side cover and showed an example of the attachment for power shovels of this invention Side view of the attachment of Fig. 1 attached to the arm tip Schematic perspective view of the attachment of FIG. Side view showing an example of a conventional attachment of the same type

Explanation of symbols

2 Hydraulic unit
11 Board
13 swivel
14 Pivot plate
15 pivot
16 Grasping claws
21 Hydraulic motor
22 Piping unit
23 cylinders
31 U-shaped frame
33 Side cover
34 Mounting plate
35 Connecting pin
36 Connecting pin
38 opening
39 Cover plate
41 arms

Claims (3)

A substrate (11), a swivel base (13) mounted on the lower surface side of the substrate so as to be rotatable about a swivel axis perpendicular to the surface of the substrate, and a pivot shaft (15 ) Swinging bucket or gripping claw (16) pivoted at the base end, and two connecting pin holes (35, 36) for connecting the substrate to the tip of the arm (41) of the power shovel. In a swivel attachment for a power shovel comprising a pair of mounting plates (34) provided with
A U-shaped frame (31) whose both sides are welded to the upper surface of the substrate, the mounting plate whose base side is welded to both sides of the U-shaped frame, and between the substrate and the U-shaped frame (31). A hydraulic unit (2) including a hydraulic motor (21) and a hydraulic piping unit (22) housed in the space, and the U-shaped frame and the mounting plate transmit working force or external force acting on the attachment to the arm. A swivel attachment for a power shovel, characterized by being a strength bearing member.   The swivel attachment according to claim 1, further comprising a detachable side cover (33) that is screwed to a side portion of the U-shaped frame (31) and closes side openings on both sides of the U-shaped frame. A base is welded to a swivel base (13) that is pivotally mounted around the swivel axis via a swivel bearing (12) on the substrate (1) to support the pivot shaft (15). Two pivot plates (14) and a cylinder (23) for swinging or opening / closing a bucket or gripping claw (16) pivotally supported by the pivot shaft, the cylinder (23) ) Is a swivel attachment disposed between the two pivot plates,
An opening (38) provided in the pivot support plate (14) and a detachable cover plate (39) whose peripheral edge is screwed to the mounting plate and closes the opening, Item 3. The turning attachment according to item 1 or 2.

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