JP6092313B2 - Both grab attachments used on excavators - Google Patents

Description

  The present invention relates to a double grip attachment that is used by being attached to a power shovel during construction work or civil engineering work.

  Various types of attachments used on power shovels for construction work and civil engineering work have been put to practical use. For example, Patent Document 1 discloses a bucket attachment, and FIG. 3 shows a configuration in a case where the technique is applied to a double grip attachment. FIG. 3 (a) is a side view in which the upper and lower nails are opened, and FIG. 3 (b) is a side view of the posture in which the upper and lower nails are closed. In FIG. 3, illustration of the structure for reinforcement is omitted.

  Reference numeral 51 in FIG. 3 denotes a first support pin for attaching the both-grip attachment of the present invention to the tip of the cylinder 1, and reference numeral 52 denotes a tip of the arm 2 for attaching the both-grip attachment. The second support pin 53 is a third support pin disposed behind (on the right side in FIG. 3) the second support pin 52 of the arm 2 in order to attach the both grip attachments. In other words, both grip attachments are attached to the cylinder 1 and the arm 2 of the excavator via the first support pin 51, the second support pin 52, and the third support pin 53, and when the attachment is replaced, the first support pin 51 is attached. The pin 51, the second support pin 52, and the third support pin 53 are attached and detached.

  Reference numeral 6 in FIG. 3 is a pin (hereinafter referred to as a connecting pin) that rotatably connects the rear ends of the upper claw 3 and the lower claw 4.

  When closing the upper and lower claws 3 and 4 as shown in FIG. 3 (a), the cylinder 1 is hydraulically extended to move the first support pin 51 forward (left side in FIG. 3). Move. As the first support pin 51 moves, the link 7 rotates with the third support pin 53 as a fulcrum. By the rotation of the link 7, the tip of the upper claw 3 is pushed down, and the connecting pin 6 at the rear end of the upper claw 3 moves rearward (right side in FIG. 3). As a result, the lower claw 4 connected by the connecting pin 6 rotates about the second support pin 52 as a fulcrum, and the tip of the lower claw 4 is lifted to a closed position as shown in FIG. Become.

  In such a double grip attachment, since the driving force acting on the first support pin 51 by the cylinder 1 is concentrated on the connection pin 6, the connection pin 6 is easily damaged.

  That is, the double grip attachment disclosed in Patent Document 1 has a problem that durability is inferior. In addition, the stroke of the cylinder 1 required to change the upper nail 3 and the lower nail 4 from the open position to the closed position (or from the closed position to the open position) becomes longer, which reduces work efficiency at the construction site. Invite.

Japanese Patent No. 2782015

  An object of the present invention is to provide a double grip attachment that solves the problems of the prior art, has excellent durability, and can change the postures of the upper and lower nails in a short time.

  The present inventor examines a technique for enhancing the durability of both gripping attachments, and by dispersing the driving force acting on the first support pin by the cylinder to the upper and lower claws, it is possible to prevent the connection pins from being damaged, As a result, it was found that the durability of the double grip attachment can be improved.

  Therefore, the technology for distributing the cylinder driving force to the upper and lower claws is studied in more detail, and by combining multiple links and multiple connecting pins to form a double grip attachment, the cylinder driving force can be reduced. It was found that it can be dispersed in the upper and lower nails. In addition, the cylinder stroke required to change the posture of the upper and lower claws can be shortened, so the posture can be changed in a short time, and as a result, the work efficiency at the construction site can be improved. Turned out to be.

The present invention has been made based on such knowledge.
That is, the present invention is a double-grip attachment that is used by being attached to a power shovel, and includes a first support pin for rotatably supporting a first link by a tip portion of a cylinder of the power shovel, a first link and an upper A first connecting pin that rotatably connects the claw, a third connecting pin that rotatably connects the rear end portion of the upper claw and the rear end portion of the lower claw, and the tip of the arm of the power shovel is the lower claw A second support pin for pivotally supporting the second claw, a fourth connecting pin for pivotally coupling the lower claw and one end of the second link, and a pivotable connection between the other end of the second link and the first link. a second connecting pin connected to a third link pivotally connected at one end to a second connecting pin, and a third support pin of the arm to support the other end of the third link rotatably, and It has a double grip attachment.

  The weight of the power shovel to which the both grip attachments of the present invention are attached is preferably within a range of 0.7 to 20.0 tons. More preferably, it is 9.0-20.0 tons.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to obtain the both-grip attachment which is excellent in durability and can change the attitude | position of an upper nail and a lower nail in a short time, and there exists an industrial remarkable effect.

It is a side view which shows the example which opened the upper nail | claw and lower nail | claw of the both grip attachment of this invention. It is a side view which shows the example which closed the upper nail | claw and the lower nail | claw in FIG. It is a side view which shows the example of the conventional both grip attachment.

  FIG. 1 is a side view showing an example in which an upper claw 3 and a lower claw 4 are opened by mounting both gripping attachments of the present invention on a cylinder 1 and an arm 2 of a power shovel. In FIG. 1, the structure for reinforcement is not shown.

  Reference numeral 51 in FIG. 1 denotes a first support pin for attaching the both grip attachments of the present invention to the tip of the cylinder 1, and reference numeral 52 denotes a tip of the arm 2 for attaching both the grip attachments. The second support pin 53 is a third support pin disposed behind (on the right side in FIG. 1) the second support pin 52 of the arm 2 in order to attach both grip attachments. In other words, both grip attachments are attached to the cylinder 1 and the arm 2 of the excavator via the first support pin 51, the second support pin 52, and the third support pin 53, and when the attachment is replaced, the first support pin 51 is attached. The pin 51, the second support pin 52, and the third support pin 53 are attached and detached.

  Reference numerals 61 to 64 in FIG. 1 connect the members (that is, the upper claw 3, the lower claw 4, the first link 71, the second link 72, and the third link 73) constituting the both grip attachments so as to be rotatable. It is a pin (that is, a connecting pin).

  A first support pin 51 is disposed on the first link 71 and is rotatably connected to the tip of the cylinder 1. Further, the first link 71 is provided with a first connecting pin 61 on the upper claw 3 side of the first support pin 51 and is connected to the upper claw 3 so as to be rotatable. Further, a second connection pin 62 is disposed on the first link 71 closer to the third support pin 53 than the first support pin 51 and is rotatably connected to a second link 72 described later. The rear end portion of the upper claw 3 is rotatably connected to the rear end portion of the lower claw 4 via a third connection pin 63.

  The lower claw 4 is rotatably connected to the tip end portion of the arm 2 via the second support pin 52. Further, the lower claw 4 is provided with a fourth connecting pin 64 on the tip side of the third connecting pin 63, and one end of the second link 72 is rotatably connected to the fourth connecting pin 64. A second connecting pin 62 is disposed at the other end of the second link 72, and the second link 72 and the first link 71 are rotatably connected. Further, one end of a third link 73 is rotatably connected to the second link 72, and a third support pin 53 is disposed on the other end of the third link 73. That is, the third link 73 and the arm 2 are rotatably connected via the third support pin 53.

  Hereinafter, the operation of each member when the upper and lower claws 3 and 4 of the both-grip attachment of the present invention are transferred from the open position (see FIG. 1) to the closed position (see FIG. 2) will be described.

  When closing the upper claws 3 and the lower claws 4 as shown in FIG. 1, the cylinder 1 is hydraulically extended to move the first support pin 51 forward (left side in FIG. 1). As the first support pin 51 moves, the second connecting pin 62 also moves forward. However, since the third support pin 53 is attached to the arm 2, the third link 73 is connected to the third support pin 53. It rotates as a fulcrum.

  By the rotation of the third link 73, the second link 72 is pushed downward, and the fourth connecting pin 64 moves downward. As a result, the lower claw 4 rotates with the second support pin 52 as a fulcrum, so that the tip of the lower claw 4 rises upward while the rear end of the lower claw 4 falls downward. Then, as the rear end of the lower claw 4 is lowered, the upper claw 3 connected by the third connecting pin 63 is rotated and the tip thereof is lowered. Thus, the upper claw 3 and the lower claw 4 as shown in FIG.

  At this time, the upper claw 3 is also subjected to the action of pushing down the first connecting pin 61 by the extension of the cylinder 1, so that the upper claw 3 and the lower claw 4 can be smoothly closed.

  Further, when the upper nail 3 and the lower nail 4 are smoothly closed (see FIG. 2) to the open position (see FIG. 1), the cylinder 1 is contracted.

  In this way, the driving force acting on the first support pin 51 by the cylinder 1 can be distributed to the upper claw 3 and the lower claw 4, and as a result, the durability of the double grip attachment can be improved. . In addition, the stroke of the cylinder 1 required to close (or until the upper pawl 3 and the lower pawl 4 are closed) can be shortened, and the upper pawl 3 and the lower pawl 4 can be opened and closed in a short time. As a result, it contributes to improving the operability of both grip attachments, and thus the efficiency of construction work and civil engineering work.

  It is preferable that the double grip attachment of the present invention is attached to a power shovel having a weight of 0.7 to 20.0 tons. This is because various objects (for example, wood, steel frames, concrete blocks, etc.) can be stably and reliably grasped in construction work and civil engineering work. If it is mounted on a power shovel having a weight of 9.0 to 20.0 tons, it is more preferable because a large-sized heavy object can be gripped stably and reliably.

  1 and 2 show an example in which the front ends (left side in FIG. 1) of the upper nail 3 and the lower nail 4 are curved. In the present invention, the front ends of the upper nail 3 and the lower nail 4 The shape is not particularly limited. That is, the front end portions of the upper and lower claws 3 and 4 are designed to have a suitable shape according to the size and weight of the object to be gripped, but the present invention is applicable to any shape of the tip portion. Is possible.

1 and 2 are attached to a power shovel (main body weight 12 tons), and the upper and lower claws are extended by expanding and contracting a cylider (pump pressure 35 MPa, piston diameter 110 mm, piston surface area 9498.5 mm ² , cylinder thrust 332.4 KN). A simulation of opening and closing the nails was performed. This is an invention example.

  And about the example of an invention, when an object is grasped in the state of the maximum opening (refer to Drawing 1), middle opening, and the minimum opening (refer to Drawing 2) of an upper nail and a lower nail, it acts on the 1st support pin-the 3rd support pin Each load was estimated. The results are shown in Table 1.

  Furthermore, in the simulation of the invention example, the cylinder stroke required for opening and closing the upper and lower claws was estimated. The results are shown in Table 2. Here, the stroke is an average value of the amount of cylinder stretching until the transition from the open position (see FIG. 1) to the closed position (see FIG. 2) and the contraction amount until the transition from the closed position to the open position is performed. Indicates.

  Next, as a comparative example, a simulation was performed in which the both grab attachments shown in FIG. 3 were attached to a power shovel, and the upper and lower claws were opened and closed by expanding and contracting the cylinder. In the simulation of the comparative example, the result of trial calculation of the load acting on each support pin as in the invention example is shown in Table 1, and the result of trial calculation of the cylinder stroke required for opening and closing is shown in Table 2.

  As is clear from Table 1, both the gripping attachments of the invention example are different from the comparative example in the load acting on each support pin except for the first support pin when the object is gripped with the minimum opening. Was also small. As shown in Table 1, the load acting on the first support pin when the object is gripped in the state of the minimum opening is the same as that in the comparative example, so when the object is gripped, the load is applied to the first support pin to the third support pin. It was found that the acting load is equal to or smaller than that of the comparative example in all postures. This indicates that the dual grip attachment of the inventive example is excellent in durability.

  Further, as is clear from Table 2, the both-grip attachment of the invention example could be opened and closed with a shorter stroke than the comparative example. This indicates that the both-grip attachment of the invention example can be opened and closed in a short time, and means that the postures of the upper and lower claws can be changed efficiently.

1 cylinder 2 arm 3 upper nail 4 lower nail
51 First support pin
52 Second support pin
53 Third support pin 6 Connecting pin
61 First connecting pin
62 Second connecting pin
63 3rd connecting pin
64 4th connecting pin 7 link
71 First link
72 Second link
73 Third link

Claims (2)

A double-grip attachment used by being mounted on a power shovel, wherein a tip of a cylinder of the power shovel supports a first link rotatably, and the first link and an upper claw. A first connection pin that is rotatably connected, a third connection pin that rotatably connects a rear end portion of the upper claw and a rear end portion of the lower claw, and a tip portion of the arm of the power shovel is the lower claw A second support pin for pivotally supporting the second claw, a fourth connecting pin for pivotally coupling the lower claw and one end of the second link, and the other end of the second link and the first link. a second connecting pin for pivotally connecting a third link pivotally connected at one end to the second connecting pin, for the arm is rotatably supported to the other end of said third link And a third support pin, Attachment.   The both-grip attachment according to claim 1, wherein the weight of the power shovel is 0.7 to 20.0 tons.

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