JP2015086516A - Bucket link device installed with hook - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a lifting hook from coming off together with a bucket during a change of the bucket when the lifting hook is included together with a bucket for use as an attachment for a work machine.SOLUTION: A work machine comprises: an undercarriage; a revolving upper machinery rotatably mounted on the undercarriage; a work unit, one end of which is attached to the front portion of the revolving upper machinery and which comprises either a boom or an arm and an attachment; and a bucket cylinder for elevating motion of the attachment. A bucket link device is provided between the bucket cylinder and the attachment, and a lifting hook is provided in such a way that it can be housed into and taken out of the bucket link. Two types of stopper guides 51a and 52a are placed apart from each other, in the vicinity of a position where a fixing pin 41 of the attachment is supported inside the bucket link 12 which connects the bucket cylinder 7c and the attachment 4c.

Description

  The present invention relates to a bucket link that connects between a bucket cylinder and a bucket that are arranged at the tip of a working device of a construction machine, and relates to a bucket link device with a hook to which a hook for a suspended load work is attached.

  In a hydraulic excavator that is a construction machine used for excavation work such as earth and sand, a bucket is provided at the tip of the working device for excavation work. In this hydraulic excavator, there is a case where a hook is attached to a bucket link that connects between a bucket cylinder and a bucket so that a relatively lightweight suspended work can be performed between excavations. An example of such a bucket link device with a hook of a hydraulic excavator is described in Patent Document 1.

  In the bucket link device with a hook described in this publication, the hook can be quickly stored in the storage space in the bucket link or can be moved in and out of the hook part in order to quickly take out the hook from the storage space in the bucket link. A latch plate is provided. Specifically, a latch plate capable of swinging in a direction substantially perpendicular to the moving direction of the hanging hook is provided, and the hanging hook is advanced in order to store the hanging hook in the storage space of the bucket link, and the hanging hook The latch plate is biased by a spring in a state in which a hanging hook for taking out the bucket from the bucket link is retracted. In the state where the load hook is advanced, the spring biases the latch plate, the latch plate engages with the hook portion of the load hook, and when the load hook is retracted, the spring is resisted against the biasing force of the spring. The applied force is applied to the latch plate and removed. Thereby, storing and taking out of the hanging load hook are performed quickly.

Japanese Patent Laid-Open No. 2001-226078

  By the way, in a work machine such as a hydraulic excavator, various types of attachments other than buckets are prepared, and are used properly according to work. Also, the bucket itself has a bowl shape at the lower end, is suitable for a wide range of excavations with a relatively wide width, has a narrow width but can be deeply excavated, and has a triangular shape to concentrate the excavation position at one point. There are various types such as the ones, etc., and these are replaced and used according to the work application. When exchanging the attachment, the attachment mounting pins provided in the bucket link are removed and replaced.

  Here, when the hanging hook is attached to the bucket link to which the attachment is attached, when the attachment attaching pin is pulled out, the attachment portion of the hanging hook that is fixed with the pin together with the attachment (bucket) is released. As a result, the suspended load hook is held on the bucket link only by a hook catch for storing in the bucket link.

  The hook catch is for storing and holding the hanging hook in the bucket link when the hanging hook is not used (corresponding to the latch plate of Patent Document 1), so that it can be easily and quickly taken out during use. The load that can be held is set. That is, in the initial state, the entire load of the hanging hook can be fully borne, but when the hydraulic excavator is used for a long time, the hook collar and the hook catch are worn and the relative distance between the hook and the hook catch is changed. There is a risk that the holding power of the lowering. As a result, if an impact load is applied at the time of pulling out the pin, there is a possibility that the suspension hook may be detached together with the bucket as an attachment.

  In the thing of the said patent document 1, storage and taking-out of a hanging load hook are certainly quick. And since the hook part of the hanging load hook is held by the latch plate, there is no fear that the hanging hook will come off with the bucket unless the hook part wears or the like. As the wear progresses, the area of the hook portion of the collar and the latch plate decreases, and the holding force may decrease.

  The present invention has been made in view of the above-described problems of the prior art, and its purpose is that when a hanging load hook is provided together with a bucket used as an attachment for a work machine, the hanging load hook comes off at the same time as the bucket replacement. Is to prevent.

  A feature of the present invention that achieves the above object is that a lower traveling body, an upper revolving body that is rotatably mounted on the lower traveling body, and one end portion attached to a front portion of the upper revolving body, a boom and an arm And a bucket link device disposed between the bucket cylinder and the attachment, and a bucket link device disposed between the bucket cylinder and the bucket link device. In a bucket link device with a hook having a hanging hook provided so as to be retractable and removable, in a bucket link connecting the bucket cylinder and the attachment, in the vicinity of a position where a mounting pin of the attachment is held 2 types of stopper guides are provided apart from each other.

  In this feature, when the connection side of the bucket link with the bucket cylinder is in the upward direction and the connection side with the attachment is in the downward direction, one of the two types of stopper guides is the attachment pin of the attachment. It is a position above the center and outside the outer diameter of the boss portion of the load hook, and the distance between the one stopper guide and the lower limit position of the bottom plate of the bucket link is the position of the load hook. It is desirable to make it larger than the outer diameter of the boss part.

  In the above feature, the other of the stopper guides may be positioned below the center of the attachment pin of the attachment and outside the outer diameter of the boss portion of the hanging load hook. A position on the inner diameter side of the stopper guide of a kind may be set to be substantially the same position as the outer diameter of the boss portion of the hanging hook, and this stopper guide may be used for centering the hanging hook.

  According to the present invention, since the suspension hook movement restricting means for preventing the suspension hook from jumping out from the bucket link is provided on the bucket link connecting the bucket cylinder and the bucket, the bucket mounting pin is connected to the bucket link when the bucket is replaced. Even if the bucket is pulled out, only the bucket is removed, and the hanging hook is held by the bucket link, so that the hanging hook can be prevented from coming off at the same time as the bucket.

1 is a side view of an embodiment of a hydraulic excavator as a work machine according to the present invention. FIG. 2 is a detailed view of a portion A in FIG. 1 and is a view in the arm axial direction. It is a BB] view of FIG. It is a figure explaining the attachment position of a guide. It is a detailed perspective view of the hook catch shown in FIG. It is a figure explaining attachment of a hook apparatus, and is the same view as FIG.

  Hereinafter, an embodiment of a work machine according to the present invention will be described using a hydraulic excavator as an example with reference to the drawings. FIG. 1 is a side view of an embodiment of a hydraulic excavator 1 according to the present invention. The hydraulic excavator 1 includes a lower traveling body 1 that can travel independently, an upper revolving body 3 that is turnably mounted on the lower traveling body 2, and a work device 4 that has one end attached to the front portion of the upper revolving body 3. And. The upper revolving unit 3 is provided on the left front side of the revolving frame 5, and a counter 6 for balancing the work device 4 disposed behind the cab 6 and the cab 6 on which an operator can ride. Weight 8 is provided.

  The working device 4 includes a boom 4a having one end attached to the front end of the upper swing body 3, an arm 4b having one end attached to the other end of the boom, and a bucket as an attachment attached to the tip of the arm 4b. 4c. The boom 4a is driven by a boom cylinder 7a so that the boom 4a can move up and down, and the arm 4b is driven by an arm cylinder 7c so as to be rotatable. The bucket 4c is driven for excavation operation by the bucket cylinder 7c.

  A bracket 42 is attached to the back side of the bucket 4c, and the second bucket link 12 is connected between the bracket 42 and the tip of the arm cylinder 7c. The connecting portion between the second bucket link 12 and the arm cylinder 7 c is connected to the distal end side of the arm 4 b by the first bucket link 11. The second bucket link 12 constitutes a bucket link device 15 with a hook.

  Details of the hooked bucket link device 15 will be described with reference to FIGS. FIG. 2 is a front view of the bucket link device 15 with a hook according to the present invention, which is a detail of the portion A of FIG. FIG. 3 is a side view of the second bucket link 12 with the right side plate portion 12g removed. In FIG. 3, the hook boss portion 35 is shown in a cross-sectional view taken along the line BB in FIG.

  The second bucket link 12 is connected to the bucket cylinder 7c in the upper part of FIG. Therefore, upper connection parts 12d and 12e branched to the left and right are formed on the upper end side of the second bucket link 12 so that the end part of the bucket cylinder 7c can be sandwiched therebetween. A through hole for connection is formed at the ends of the upper connecting portions 12d, 12e and the bucket cylinder 7c, and the upper pin 21 is fitted into the through hole. A first bucket link 11 is disposed on the outer side of each of the upper coupling portions 12 d and 12 e, and these are also fitted to the upper pin 21. As shown in FIG. 3, a bush 47 is fitted on the outer peripheral portion of the upper pin 21.

  Lower connecting portions 12a and 12b branched to the left and right are also formed in the lower portion of the second bucket link 12, and through holes into which the lower pins 41 are fitted are formed in the lower connecting portions 12a and 12b. The left and right lower connecting portions 12 a and 12 b sandwich a hook boss portion 35 that constitutes the hanging load hook 30. A bracket 42 is disposed outside the lower connecting portions 12a and 12b via spacers 61 and 62, respectively. The lower pin 41 includes a hook boss portion 35, left and right lower connecting portions 12a and 12b, and spacers 61 and 62. The left and right brackets 42 are fitted through. A bush 44 is fitted on the outer periphery of the lower pin 41 (see FIG. 3). The bracket 42 is fixed to the back side of the bucket 4c by welding or the like.

  Side plate portions 12f and 12g extending in the vertical direction are fitted between the upper and lower connecting portions 12d and 12e and the lower connecting portions 12a and 12b of the second bucket link 12 so that the hanging hook 30 can be stored. And the bottom plate portions 12c and 12k that close the bottom surface between the side plate portions 12f and 12g are formed in a U-shaped cross section. The left and right side plate portions 12f and 12g are partitioned by a reinforcing plate portion 12h. In the upper part partitioned by the reinforcing plate part 12h, an opening 12j is formed at a substantially central part in the left-right direction of the bottom plate part 12k.

  In the lower space of the second bucket link 12 partitioned by the reinforcing plate portion 12h, the mounting plate 22 of the hook catch device 25 is attached to the bottom plate portion 12c of the second bucket link 12 in order to hold the hanging hook 30. These are fixed by fixing means (bolts) 23. The hook catch device 25 is engaged with the collar portion 31 of the hanging load hook 30 by the holding portion 23.

  The suspended load hook 30 is configured to be able to store and remove the suspended load hook 30 in and from the second bucket link 12, a flange portion 31 on which a wire or the like is locked, a swivel joint portion 32 that allows the flange portion to rotate. And a hook boss 35 for rotating the entire hanging load hook 30. One end portion of the stopper plate 33 is rotatably attached to the base portion of the flange portion 31 of the hanging load hook 30 by a pin 33a. The other end of the stopper plate 33 abuts against the inner surface of the collar portion 31 by a biasing means (not shown). The stopper plate 33 prevents the suspension wire or the like from falling off the collar portion 31.

  A shaft portion 34 extends downward from the swivel joint portion 32, and is sandwiched between bracket portions 35a and 35b extending substantially parallel upward from the side surface of the hook boss portion 35. In order to sandwich the shaft portion 34, through holes are formed in the bracket portions 35a and 35b, and a pin 38 is fitted into the hole and the hole formed in the shaft portion 34. The pin 38 is prevented from falling off by a retaining pin 38a fitted in a hole provided at the shaft end (see FIG. 4).

  On the outer peripheral side of the hook boss portion 35, stopper guides 51a to 52b having one end embedded in the inner surfaces of the lower coupling portions 12a and 12b of the second bucket link 12, which is a characteristic configuration of the present invention, are provided. ing. The stopper guides 51 a to 52 b extend in the axial direction of the lower pin 41 and can contact the outer peripheral surface of the hook boss part 35.

  Next, details of the stopper guides 51a to 52b will be described with reference to FIG. 4 is an enlarged view of the hook boss 35 shown in FIG. The stopper guide 51a positioned above is positioned above the center O of the lower pin 48 and a line C extending in the horizontal direction from the center O. That is, when the hook-attached bucket link device 15 is positioned at a predetermined position, the hook boss portion 35 is positioned above the position (OC line position) at which the lateral length is maximum. The stopper guide 51a has a distance (gap) W from the lower end corner portion 12m of the bottom plate portion 12c of the second bucket link 12 from the outer diameter d of the hook boss portion 35 due to restrictions at the time of assembly which will be described later. It is attached at a position where it becomes too large.

  On the other hand, the stopper guide 52a located on the lower side is located below the OC line position. The lower stopper guide 52a is preferably positioned on the bottom plate portion 12c side (the right side in FIG. 4) from the vertical line connecting the centers of the hook boss portions 35. The reason for this is to prevent the hook boss portion 35 to be described later from dropping downward in FIG. 4 when positioning the hook boss portion 35 at the position of the second bucket link 12. Although the left stopper guides 51a and 52a have been described in FIG. 4, the right stopper guides 51b and 52b are also set to the same positions. Note that the left stopper guides 51a and 52a and the right stopper guides 51b and 52b do not necessarily have the same angular position, and the stopper guides 51a to 52b only need to satisfy the above relationship.

  FIG. 5 shows details of the hook catch device 25. FIG. 5 is a partial cross-sectional view of the hook catch device 25. The attachment plate 22 of the hook catch device 25 is fixed to the bottom plate 12c of the second bucket link 12 with bolts 24. A guide plate 23 and a guide plate 23h are erected on the mounting plate, and serve as a guide when the hook portion 31 of the hanging load hook 30 is stored in the bucket link device 15 with a hook. A support pin 23a is fixedly erected on the guide plate 23, and a plate-like latch member 23f having an outer peripheral part formed in an arc shape is rotatably locked to the support pin 23a. The lower side of the latch member 23f is bent and protrudes, and is used as a release lever that releases the state in which the latch member 23f is latched by the flange 31.

  The latch member 23f is provided with a latch pin 23e that abuts a spring 23b that is urged against the latch member 23f. The other end side of the spring 23b is in contact with the screw 23 screwed to the guide plate 23g and the spacer 23d attached to the screw 23. That is, one end of the spring 23b is in contact with the latch pin 23e, the intermediate portion is wound in a coil shape, wound around the outer periphery of the support pin 23a, and the other end is in contact with the spacer 23d. Thereby, the latch member 23f is urged | biased to the inner side of the collar part 31 in a normal state. In addition, the arrow in FIG. 5 has shown the rotation direction of the latch member 23f.

  FIG. 6 shows a case where the hanging load hook 30 is held by the hooked bucket link device 15 at the time of bucket replacement or the like. FIG. 6 is a view similar to FIG. 3 and shows a state in which the bucket 4c is removed. Since the lower pin 41 has been removed, if the hanging load hook 30 is not held by the hook catch device 25, the hanging load hook 30 has nothing to regulate, so that it can move freely. Alternatively, even when the suspended load hook 30 is newly brought into the bucket link device 15 with the hook before the bucket 4c is assembled, the suspended load hook 30 is in a free state. FIG. 6 shows such a state.

  Two stopper guides 51a and 52a are erected on the inner side of the lower connecting portion 12a formed at the lower portion of the second bucket link 12 so as to have the positional relationship shown in FIG. The lengths of the stopper guides 51a and 52a are extended to the vicinity of the positions of the end portions in the width direction of the bracket portions 35a and 35b of the hook boss portion 35 when the hanging hook 30 is attached to the hook-attached bucket link device 15. (See FIG. 2).

  Since the front side of the second bucket link 12 (the side opposite to the bottom plate portion 12c) is vacant, the second bucket link 12 is viewed from the front side with the hook boss 35 facing downward while the hanging hook 30 is inclined. Move to the lower connecting part side. Here, the portion having the maximum diameter of the hook boss 35 can pass through the upper stopper guide 51a and the second bucket link 12 between the corner 12m of the bottom plate 12c so that the upper stopper 51a The position is set. That is, the hanging hook 30 is guided downward using the upper stopper guide 51a and the corner portion 12m as a guide. Although not shown, the position of the upper stopper 51b provided on the opposite side is also set similarly.

  When the hook boss 35 of the suspended load hook 30 passing between the upper stopper guide 51a and the corner 12m is dropped using its own weight, the lower portion of the outer peripheral surface of the hook boss 35 is It contacts the lower stopper guide 52a. This prevents the suspended load hook 30 from coming out of the hooked bucket link device 15. Since the lower stopper guide 52a is installed at the same radial position as the outer diameter of the hook boss portion 35, the hook boss portion 35 is positioned in the vertical and lateral directions by the lower stopper guide 52a. In FIG. 6, 44 a and 44 b are bushes that fit into through holes formed in the lower connecting portion 12 a and the hook boss portion 35 of the second bucket link 12, respectively.

  As described above, according to the present embodiment, even when the lower pin is removed by bucket replacement or the like and the connection between the hanging hook and the second bucket link is released, It is possible to hold the hanging hook with the two types of stopper guides provided, and even if the holding force of the hook catch device holding the hanging hook is reduced, the hanging hook is securely attached to the bucket link device with the hook. Can be retained. In addition, when a suspended load hook is newly assembled, the two types of stopper guides and the bottom plate portion of the second bucket link serve as a guide to guide and position the suspended load hook to a predetermined position of the bucket link device with the hook. It becomes possible. Since the stopper guide of the present embodiment operates as described above, the stopper guide has a strength capable of bearing the weight of the hanging load hook.

DESCRIPTION OF SYMBOLS 1 ... Work machine (hydraulic excavator), 2 ... Lower traveling body, 3 ... Upper turning body, 4 ... Working device, 4a ... Boom, 4b ... Arm, 4c ... Bucket, 5 ... Turning frame, 6 ... Cab, 7a ... Boom Cylinder, 7b ... arm cylinder, 7c ... bucket cylinder, 8 ... counterweight, 11 ... (first) bucket link, 12 ... (second) bucket link, 12a, 12b ... lower connecting part, 12c ... bottom plate part, 12d, 12e ... upper connection part, 12f, 12g ... side plate part, 12h ... reinforcing plate part, 12j ... opening part, 12k ... bottom plate part, 12m ... lower end position, 15 ... bucket link device, 21 ... upper pin, 22 ... installation Plate 23: Holding portion 23a ... Support pin 23b ... Spring 23c ... Spacer 23d ... Screw 23e ... Latch pin 23f ... Latch member 23g ... Guide plate 23h ... Guy Plate, 24: Fixing means (bolt), 25: Hook catch device, 30 ... Suspended hook, 31 ... Saddle part, 32 ... Swivel joint part, 33 ... Stopper plate, 33a ... Pin, 34 ... Shaft part, 35 ... Hook Boss portion, 35a, 35b ... bracket portion, 38 ... pin, 38a ... retaining pin, 41 ... lower pin, 42 ... bracket, 44, 44a, 44b, 47 ... bush, 51a, 51b ... (upper) stopper guide, 52a, 52b (lower) stopper guide, 61, 62 ... spacer.

Claims (4)

A lower traveling body, an upper revolving body rotatably mounted on the lower traveling body, a work apparatus having one end attached to a front portion of the upper revolving body, and having an attachment and at least one of a boom and an arm; A bucket link device provided in a work machine having a bucket cylinder for raising and lowering the attachment and disposed between the bucket cylinder and the attachment; In a bucket link device with a hook having
Two bucket guides with hooks are provided in the bucket link that connects the bucket cylinder and the attachment, and in the vicinity of the position where the attachment pin of the attachment is held. apparatus.   When the connection side of the bucket link with the bucket cylinder is in the upward direction and the connection side with the attachment is in the downward direction, one of the two types of stopper guides is above the center of the attachment pin of the attachment. The outer diameter of the boss portion of the hanging load hook, and the distance between the stopper guide and the lower limit position of the bottom plate of the bucket link is the outer diameter of the boss portion of the hanging load hook. The bucket link device with a hook according to claim 1, wherein the bucket link device is larger than the bucket link device.   The other side of the stopper guide is positioned below the center of the attachment pin of the attachment and outside the outer diameter of the boss portion of the hanging hook. Bucket link device with hook.   The position of the inner diameter side of the two types of stopper guides is set to be substantially the same as the outer diameter of the boss portion of the hanging load hook, and the stopper guide can be used for centering the hanging load hook. The bucket link device with a hook according to claim 3.

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