JP2019138002A - Bucket link device installed with hook and construction machine having the same - Google Patents

Abstract

To provide a bucket link device installed with hook that is hardly broken and has a simple structure.SOLUTION: A hook device 20 is stored sideways along a bottom plate of a bucket link body part 12a in a storage part 12b. The storage part is provided with a holding part 30 for holding a hook body 23 in a storage position. The holding part 30 is provided with a guide member 31 into which the hook body 23 is fitted so as to be stored in a storage position, a lock shaft 32 that has a hook abutting protrusive part 32b capable of abutting on a folded curved part 23c of the hook body 23 and that is rotatably supported between a lock position for holding the hook body 23 in a storage position and an open position for enabling the hook body 23 to pass, by the hook abutting protrusive part 32b, an urging spring 34 for urging the lock shaft 32 so as to return to the lock position, and a stopper part 35 for holding the hook abutting protrusive part 32b pressed by the urging spring 34 in the lock position. The lock shaft 32 is installed on the side closer to a first connecting-pin 13 than the hook body 23.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a bucket link device with a hook capable of accommodating a hook device and a construction machine including the same.

  Conventionally, a bucket link device with a hook having a bucket link body having one end connected between the bucket cylinder and the bucket by a first connecting pin and the other end connected to the bucket by a second connecting pin. Is known.

  For example, in the bucket link device with a hook of Patent Document 1, a hook guide, an advance position that holds the hook in the storage position, and a retreat position that allows the hook to move to the work position in the hook storage space of the bucket link. A hook holding mechanism is provided that includes a latch plate that pivots between and a spring that constantly biases the latch plate toward the advanced position. Thereby, only by moving the hook into the hook storage space, the latch plate biased by the spring can be engaged with the hook, and the hook can be held in the storage position.

  Moreover, in the thing of patent document 2, the hook engaging part engaged with the fixing body which fixes a hook is fixed to the bucket link, and the hook engaging part is formed in this hook engaging part. A cam body that holds and fixes the collar portion by pressing the engaged collar portion against the elastic body, and a latch that engages with the cam body that holds and fixes the collar portion are used.

Japanese Patent Laid-Open No. 2001-226078 JP 2007-161357 A

  However, in the bucket link device with a hook as in the above-mentioned Patent Document 1, the hook body is stored in a so-called vertical position that is substantially perpendicular to the bottom plate, so that the storage posture becomes high, and the hook body protrudes from the bucket link and excavates. There is a problem that damage accidents easily occur due to collision of time. In addition, although the latch plate has a retaining function, it does not suppress the rattling of the hook body, and during the excavation, the latch plate and the hook body are subject to wear and damage due to continuous wear. There is a fear. Furthermore, if the second connecting pin is removed at the time of bucket replacement, the center of the mounting hole of the hook body will be displaced, so there is a problem that it is difficult to insert the second connecting pin when it is next attached.

  Further, the above-mentioned Patent Document 2 has a complicated structure in which a latch mechanism and a cam mechanism are combined, and there are two operation levers, which is troublesome to handle and may not be able to be stored and held even with slight damage and deformation. is there.

  The present invention has been made in view of such points, and an object of the present invention is to make the bucket link device with a hook difficult to break and have a simple structure.

  In order to achieve the above object, according to the present invention, the hook body can be held horizontally in the storage position by the lock member and the biasing member including the guide member and the lock shaft.

  Specifically, in the first invention, between the bucket cylinder and the bucket, one end side is connected to the bucket cylinder by a first connection pin, and the other end side is connected to the bucket by a second connection pin and attached. A bucket link device with a hook having a main body is intended.

And the bucket link device with a hook is
A hook device having a base end portion swingably connected to the second connection pin and a hook-like hook body connected to the base end portion;
A storage portion formed on the bucket link body, wherein the hook device stores the hook-shaped hook body sideways along a bottom plate of the bucket link body;
A holding part that is provided in the storage part and holds the storage position where the hook body is stored sideways;
The holding part is
A guide member that fits so that the hook body is stored in the storage position;
A hook abutting protrusion that is capable of abutting against a bending curve portion of the hook body, and the hook abutting protrusion allows the hook body to be held in the storage position and to pass through the hook body; A lock shaft supported so as to be pivotable between open positions;
An urging member that urges the lock shaft to return to the lock position;
A hook portion that is pushed by the urging member and has a stopper portion that holds the hook contact protrusion in the lock position;
The lock shaft is provided closer to the first connecting pin than the hook body.

  According to said structure, when a hook main body is accommodated, for example, the bending curved part (part which becomes the lowest end part at the time of hanging) of a hook main body contact | abuts to a hook contact protrusion part, and the biasing force of a biasing member By forcibly turning the lock shaft against this, it becomes the open position, and after the hook body is stored in the storage position, the lock shaft returns to the lock position by the urging force of the urging member. Is retained. On the contrary, when removing the hook body, the hook abutment protruding portion is pressed and forcibly rotated from the lock position to the open position, so that the lock can be released and taken out. Since the lock shaft is provided on the first connecting pin side with respect to the hook body, the hook body easily comes into contact with the hook contact protrusion as the hook body rotates. Here, “the hook-shaped hook body is stored sideways along the bottom plate of the bucket link body” means that the hook body does not necessarily have to be arranged parallel to the bottom plate of the bucket link body, and is close to a right angle. If not, it means that it may be slightly inclined with respect to the bottom plate.

In the second invention, in the first invention,
The guide member includes a notch into which the tip side and the base side of the hook body are fitted.

  According to said structure, a hook main body is reliably accommodated in a predetermined position, and the width | variety and depth direction of a width direction and a depth direction are ensured by specifying with respect to the width | variety and thickness of the outer side of a notch, and the depth of a hook main body. The rattling can be further reliably suppressed.

In the third invention, in the second invention,
The notch is composed of a first notch and a second notch into which the tip side and the root side of the hook body are respectively fitted,
The guide member includes a protruding piece that prevents the hook portion of the hook body from coming off between the first cutout and the second cutout.

  According to the above configuration, the hook main body is securely stored in a predetermined position, and is more difficult to rattle, and when the second connecting pin is pulled out during bucket replacement, the hook main body is prevented from coming off by the protruding piece. When the second connecting pin is inserted again, the position of the base end portion is not displaced, and alignment becomes extremely easy.

  In a construction machine according to a fourth aspect, the bucket link device with a hook according to any one of the first to third aspects is provided between the bucket cylinder and the bucket.

  According to said structure, a construction machine with high commerciality provided with the bucket link apparatus with a hook of a simple structure which is easy to store and is not easily damaged is obtained.

  As described above, according to the present invention, a hook body having a hook contact protrusion and a pivotable lock shaft biased to a lock position is used to store a so-called lateral hook body. Therefore, it is possible to make the bucket link device with the hook difficult to break and have a simple structure.

It is a top view which shows the bucket link apparatus with a hook in which a hook main body exists in a storage position. It is the II-II sectional view taken on the line of FIG. It is the III-III sectional view taken on the line of FIG. It is a side view which shows the hydraulic excavator with which the bucket link apparatus with a hook was mounted | worn.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 4 shows a hydraulic excavator 1 as a construction machine provided with a bucket link device with a hook according to an embodiment of the present invention. The excavator 1 includes, for example, a lower traveling body 2 such as a crawler, an upper revolving body 3 that is pivotally supported by the lower traveling body 2, a cab 4 provided in the upper revolving body 3, A lower boom 5 supported by the swivel body 3 so as to be raised and lowered is provided. The lower boom 5 is supported by a hoisting cylinder 6 so as to be able to be raised and lowered, and an arm 7 is supported at the tip thereof by an arm cylinder 8 so as to be swingable. A bucket 9 is supported at the tip of the arm 7 by a bucket cylinder 10 via an arm link 11 and a bucket link device 12 with a hook so as to be swingable. The lower traveling body 2 may be a wheel.

  Specifically, the bucket link device 12 with a hook is connected between the bucket cylinder 10 and the bucket 9 at one end side to the bucket cylinder 10 by the first connection pin 13 and at the other end side to the bucket 9 as the second connection pin. 14 are connected and attached.

  As shown in FIG. 1, the bucket link device 12 with a hook includes a hook device 20, and the hook device 20 is connected to the second connecting pin 14 so as to be swingable. 21 has a hook-shaped hook body 23 connected to 21. The hook main body 23 has a flange portion having a substantially circular or elliptical cross section, and the thickness of the hook body 23 is thick on the root side 23b and the tip side 23a bent in an arc shape is thin. A retaining portion 24 that is urged in the closing direction is provided in the gap between the distal end side 23a and the root side 23b through which a wire or the like is passed. The retaining portion 24 has, for example, a steel plate bending structure. The hook part of the hook body 23 can swing around a hook part support pin 25 provided on the base end part 21. Further, the hook portion of the hook body 23 is supported so as to be rotatable with respect to the base end portion 21.

  The bucket link main body 12a made of a member excluding the hook device 20 is provided with a storage portion 12b in which the hook device 20 is stored. The storage portion 12b is provided in a space between the first boss portion 12c and the second boss portion 12d in the bucket link main body 12a and surrounded by the pair of side plates 12e and the bottom plate 12f. The top plate is not provided on the side opposite to the bottom plate 12f, and an opening through which the hook body 23 enters and exits is formed.

  The storage unit 12b is provided with a holding unit 30 that holds the hook body 23 in a storage position in which the hook body 23 is stored sideways. Here, although it is the storage position defined as “laterally”, it is the direction of storage along the bottom plate 12f of the bucket link main body 12a, and it is not in a vertically placed state substantially perpendicular to the bottom plate 12f as in Patent Document 1. Means direction. Specifically, as shown in FIG. 2, it is not necessary to be completely parallel to the bottom plate 12f, and may be inclined, but the hook body 23 and the base end portion 21 protrude from the side plate 12e in a side view. It must be in a position that does not.

  And this holding | maintenance part 30 is provided with the guide member 31 fitted so that the hook main body 23 may be accommodated in the horizontal storage position. As shown in FIG. 3, the guide member 31 is made of, for example, a plate-like member, and includes a first cutout 31 a and a second cutout 31 b into which the distal end side 23 a and the root side 23 b of the hook body 23 are fitted. Yes. Here, either the front end side 23a or the root side 23b may be stored in the first cutout 31a, and either the front end side 23a or the root side 23b may be stored in the second cutout 31b. Since the protruding piece 31c is provided between the first cutout 31a and the second cutout 31b, the protruding piece 31c can be surrounded by the inner surface of the flange portion, so that the stability of the hook body 23 is further increased.

  Further, as shown in FIG. 2, the holding portion 30 is located farther from the guide member 31 with respect to the bottom plate 12f, and a lock position R (state shown in FIG. 1) for holding the hook body 23 in the storage position and the lock A lock shaft 32 is provided that is rotatably supported between an open position L that can be released from the position R. The lock shaft 32 includes a flat hook contact protrusion 32b on the outer periphery of a lock shaft main body 32a made of, for example, a steel pipe. The hook contact protrusion 32b is fixed to the lock shaft main body 32a by welding, for example. By inserting the support pin 33 into the center of the lock shaft main body 32a, the lock shaft 32 is disposed at a position where the hook main body 23 does not contact the lock shaft main body 32a but contacts the hook contact protrusion 32b. Has been.

  In addition, the holding unit 30 includes a biasing spring 34 as a biasing member that biases the lock shaft 32 so as to return to the lock position R. As shown in FIG. 1 and the like, the urging spring 34 is formed of, for example, a torsion coil spring, and its coil 34 is fixed so that one end 34a is fixed to the side plate 12e and the other end 34b urges the hook contact protrusion 32b. The portion 34 c is fitted on the outer periphery of the support pin 33 that rotatably supports the lock shaft 32. The urging spring 34 may be constituted by a leaf spring or the like. Further, the lock shaft 32 may not be a pin insertion type support structure as in the present embodiment, but may be a configuration in which a central axis extending from the lock shaft 32 is supported on the side plate 12e, a bolt pin structure, or the like.

  For example, as shown in FIG. 3, the holding part 30 includes a stopper part 35 that restricts the rotation range of the lock shaft 32. The stopper portion 35 is formed of, for example, a bolt member or the like, and is configured such that a bolt head protruding from the side plate 12e comes into contact with the hook contact protruding portion 32b and the lock shaft 32 at a predetermined angle. With this configuration, the lock shaft 32 urged by the urging spring 34 does not rotate more than a predetermined angle, and allows rotation in the storage direction of the hook body 23.

  Then, the lock shaft 32 can be switched from the lock position R to the open position L by pressing the hook contact protrusion 32b to rotate the lock shaft 32 against the biasing spring 34. It has become. That is, the hook body 23 can be stored by pressing the hook body 23 directly against the hook contact protrusion 32b and rotating the hook contact protrusion 32b.

  Next, the work for inserting and removing the hook body 23 will be described.

  The hook body 23 is put in and out in a working posture of the excavator 1 as shown in FIG. 4, for example.

  First, the hook body 23 is held by hand, and the hook body 23 is stored while being rotated around the base end 21 side. Then, the hook body 23 is pulled up sideways so that the hook portion is pushed into the bottom plate 12f side of the storage portion 12b.

  Then, the collar portion comes into contact with the hook contact protrusion 32 b of the lock shaft 32. Since the lock shaft 32 is provided on the first connecting pin 13 side with respect to the hook body 23, the hook portion easily abuts on the hook abutting projection-like portion with the rotation operation.

  Further, when the hook contact protrusion 32b is pushed in by the hook, the lock shaft 32 rotates against the biasing force of the biasing spring 34, the lock shaft 32 is pushed to the open position L, and the hook passes. The guide member 31 is fitted into the first cutout 31a and the second cutout 31b and is stored in the storage position. At this time, if it is attempted to store the eaves portion in the vertical direction, the guide member 31 is not fitted, so that the user notices that the direction is wrong.

  After that, the lock shaft 32 returns to the lock position R by the urging force of the urging spring 34, so that the region (bending curved portion 23c) indicated by cross hatching, for example, as shown in FIG. Therefore, it is prevented from coming off by the hook contact protrusion 32b. In this storage position, even if a rock or the like collides with the lock shaft 32, the lock is not released unless the rock abuts against the hook contact protrusion 32 b and rotates in the direction of the open position L. For this reason, the lock is prevented from being unintentionally released, and by adjusting the gap C between the hook body 23 and the lock shaft 32, the hook body 23 can be made less likely to be rattled. . Further, by limiting the outer width W and depth H of the first notch 31a and the second notch 31b to a certain extent with respect to the width and thickness of the hook main body, the rattling in the width direction and the depth direction is ensured. It is suppressed. In addition, the bending curved portion 23 c is a curved portion that comes to the bottom when the hook body 23 is suspended, and is a portion further away from the heel support portion 25.

  On the other hand, when the hook body 23 is taken out, first, the hook abutting protrusion 32b is directly pushed by hand and is rotated so as to push down from the position R to the position L as shown in FIG. Thus, the lock shaft 32 is easily switched from the lock position R to the release position L. In that state, the hook body 23 is held by hand and pulled. For this reason, the unlocking operation is easy.

  In the attitude of the shovel 1 shown in FIG. 4, when exchanging the bucket 9, the hook body 23 is prevented from coming off by the protruding piece 31 c when the second connecting pin 14 is pulled out, so that it does not shift downward due to its own weight. However, when the second connecting pin 14 is inserted again, alignment becomes extremely easy.

  As described above, according to the present embodiment, the hook main body 23 is accommodated by using the lock shaft 32 that has the hook contact protrusion 32b and is biased to the lock position. Therefore, it is possible to make the bucket link device 12 with a hook difficult to break and have a simple structure. Thereby, the hydraulic excavator 1 with high merchantability provided with the bucket link device 12 with a hook that is not easily damaged and has a simple structure is obtained.

(Other embodiments)
The present invention may be configured as follows with respect to the above embodiment.

  That is, in the said embodiment, although the hook contact protrusion part 32b was made into the rectangular plate shape, if it is provided in the area | region shown by the cross hatching shown in FIG. 1 at least, it will not be limited to the shape. The portion that contacts the stopper portion 35 may be constituted by a protruding portion other than the hook contact protrusion portion 32b. In this case, the position of the stopper portion 35 may be changed.

  Moreover, in the said embodiment, although the example of the hydraulic shovel 1 was shown as a construction machine, the backhoe loader etc. which have the attachment which has the bucket link apparatus 12 with a hook in the other side of a dozer may be used.

  In addition, the above embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or a use.

1 Excavator (construction machine)
2 Lower traveling body
3 Upper swing body
4 cab
5 Lower boom
6 Rolling cylinder
7 Arm
8 Arm cylinder
9 buckets
10 Bucket cylinder
11 Arm link
12 Bucket link device with hook
12a Bucket link body
12b storage section
12c 1st boss part
12d Second boss
12e side plate
12f Bottom plate
13 First connecting pin
14 Second connecting pin
20 Hook device
21 Base end
23 Hook body
23a Tip side
23b Root side
23c Bending curve
24 Retaining part
25 buttock support pin
30 Holding part
31 Guide member
31a 1st notch
31b Second notch
31c Projection
32 Lock shaft
32a Lock shaft body
32b Hook contact protrusion
33 Support pin
34 Biasing spring (Biasing member)
34a one end
34b The other end
34c Coil part
35 Stopper

Claims (4)

A bucket link device with a hook having a bucket link body in which one end side is connected to the bucket cylinder by a first connecting pin and the other end side is connected to the bucket by a second connecting pin between the bucket cylinder and the bucket. ,
A hook device having a base end portion swingably connected to the second connection pin and a hook-like hook body connected to the base end portion;
A storage portion formed on the bucket link body, wherein the hook device stores the hook-shaped hook body sideways along a bottom plate of the bucket link body;
A holding part that is provided in the storage part and holds the storage position where the hook body is stored sideways;
The holding part is
A guide member that fits so that the hook body is stored in the storage position;
A hook abutting protrusion that is capable of abutting against a bending curve portion of the hook body, and the hook abutting protrusion allows the hook body to be held in the storage position and to pass through the hook body; A lock shaft supported so as to be pivotable between open positions;
An urging member that urges the lock shaft to return to the lock position;
A hook portion that is pushed by the urging member and has a stopper portion that holds the hook contact protrusion in the lock position;
The bucket link device with a hook, wherein the lock shaft is provided closer to the first connecting pin than the hook body. In the bucket link device with a hook according to claim 1,
The bucket link device with a hook, wherein the guide member includes a notch into which a front end side and a root side of the hook main body are fitted. In the bucket link device with a hook according to claim 2,
The notch is composed of a first notch and a second notch into which the tip side and the root side of the hook body are respectively fitted,
The bucket link device with a hook, wherein the guide member includes a protruding piece that prevents the hook portion of the hook body from coming off between the first cutout and the second cutout. A construction machine, wherein the bucket link device with a hook according to any one of claims 1 to 3 is provided between a bucket cylinder and a bucket.

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