JPH0726416B2 - Hydraulic shovel with crane device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a hydraulic excavator with a crane device capable of performing a crane operation with a bucket attached.

[Prior Art] First, the configuration of a general hydraulic excavator will be described with reference to FIG.

A boom 2 that is raised and lowered by a boom cylinder 5 is attached to the front of the shovel body 1, and an arm 3 that is swung by an arm cylinder 6 is connected to the tip of the boom 2 and the tip of the arm 3 is connected. Is bucket cylinder 7
A bucket 4 which is rotated by means of a pin is attached by a pin 10. The base end portion of the bucket cylinder 7 is connected to the upper rear portion of the arm 3, and the tip end portion of the piston rod of the bucket cylinder 7 is connected to one end portions of the first link 8 and the second link 9. The other end of the first link 8 is connected to the front side surface of the arm 3 by a pin, and the other end of the second link 9 is connected to the side plate 4a of the bucket 4 by a pin. A plurality of claws 4b are attached to the tip of the bucket 4. Due to the expansion and contraction of the bucket cylinder 7, the bucket 4 rotates in the forward and reverse directions.

Next, three examples of conventional hydraulic excavators with a crane device will be described with reference to FIG. 7, FIG. 8, FIG. 9 and FIG.

In the hydraulic excavator with a crane device shown in FIG. 7, the winch 18 is attached to the arm 3, and the wire rope 20 wound around the winch 18 is attached to the sheave 19 and the hook 21 at the front part of the arm 3.
It was handed over to.

In the hydraulic excavator with a crane device shown in FIG. 8, a hook 23 is attached to a tip portion of an arm by a pin 22, and the bucket 4 is removed.

The hydraulic excavator with a crane device shown in FIGS. 9 and 10 is constructed by hooking a sling wire rope 25 on a hook 24 fixed to the back surface of the bucket 4.

Further, Japanese Utility Model Laid-Open No. 61-40453 discloses a structure in which a bearing portion of a bucket link is divided into two parts, and a crane hook is supported between them.

[Problems to be solved by the invention]

In the case of the one shown in FIG. 7 described above, since the winch 18 and the sheave 19 are attached to the arm 3, the arm 3 has to be remodeled to a large extent, and the irregular winding of the wire rope 20 and the break of the wire are constantly monitored and managed. There is a need to. Moreover, near the vertical state of the arm 3, the wire rope 20 and the hook 21 are in the bucket 4.
There is a risk that the tip of the claw 4b may come into contact with the wire, causing wire breakage or damage. Further, when the hydraulic excavator turns, the load is shaken and the wire rope is used. Therefore, the impact force cannot be applied, and it is not suitable for pulling out an embedded object such as a steel sheet pile.

In the case shown in FIG. 8, the bucket 4 must be removed and the hook 23 must be attached during the crane operation.
In water supply and sewer construction and field maintenance, a fume pipe and a U-shaped groove are laid immediately after excavation of a groove, but the bucket and hook must be replaced each time, which is troublesome.

In the case shown in FIGS. 9 and 10, since the hook 24 is on the back surface of the bucket 4, it cannot be seen by the operator in the cab,
It is not possible to monitor the damage of the hook 24 and the detachment of the sling wire rope 25 from the hook 24. Further, as shown in FIG. 9, when the bucket 4 is raised high, the slinging wire rope 25 is rubbed on the back surface of the bucket 4, so that the wire may be broken. Further, when the swing wire rope 25 shakes as shown by the chain line in FIG. The points move. For this reason, the sling wire rope 25 is likely to come off, which is dangerous. Moreover, if the load point moves to the tip of the hook 24, it is disadvantageous in terms of strength.

In the one disclosed in Japanese Utility Model Laid-Open No. 61-40453, since the hook is located on the back surface of the bucket, the operator cannot monitor the same as in FIGS. 9 and 10, and when excavating with the bucket. Hook dances. Moreover, since the hook sinks into the earth and sand during excavation, the hook cannot freely rotate. If the hook does not rotate, it cannot rotate on a horizontal plane due to human power to change the direction of the suspended load. Even if it is rotated, it tries to return due to the reaction force of the wire rope, so it is necessary to always hold the load, which is dangerous. If you use a hook with bearings, the hook itself becomes large and becomes an obstacle when excavating. Moreover, since the hook is attached to the back surface of the bucket, it is difficult to attach the load detector as a safety device. Furthermore, as shown in FIG. 9, when the bucket is raised high, the hook hits the back surface of the bucket, which may deform the bucket, and it is necessary to sufficiently reinforce the bucket.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a hydraulic excavator with a crane device that enables smooth crane work without removing the bucket.

[Means for solving problems]

In order to achieve the above object, according to the present invention, a bucket and a rigid hanger having an upper end mounting portion located outside a side plate of the bucket are pivoted by a pin at the tip of an arm constituting a working machine. It is supported freely, the length of the hamber is longer than the turning radius of the bucket toe, a plate-like part is provided at the lower end of the hanger so that the bucket toe does not interfere, and the hook at the lower end of the hanger. Is attached, and a hanger or hook hook metal fitting is provided on the arm.

[Action]

During crane work, hang the hanger from the tip of the arm, shorten the bucket cylinder as much as possible, and keep the tip of the bucket claw away from the hanger.

When storing the hanger and hook, the bucket cylinder is extended, the tip of the bucket claw is applied to the box-shaped structure of the hanger, and the bucket cylinder is further extended to position the hanger and hook below the arm, Hold in the storage position via the hook.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

At the tip of the arm 3, a bucket 4 and a hanger 11 having a rigid structure having upper end mounting portions located outside the pair of left and right side plates 4a of the bucket 4 are attached by pins 10. pin
Reference numeral 10 has a longer axial dimension than that of the dedicated bucket machine, and is inserted into the hanger 11, the side plate 4a of the bucket 4, and the pin hole of the arm 3. The bucket 4 and the hanger 11 can freely rotate about the pin 10. The hanger 11 is formed to be longer than the turning radius of the tip of the claw 4b of the bucket 4, and a plate-shaped portion that does not interfere with the contact of the tip of the claw 4b is provided in the lower middle portion thereof. That is, in this embodiment, the portion 11a has a box-shaped structure. A holder 13 is inserted inside the box-shaped structure 11 a, and the holder 13 is supported by pins 15. The pin 15 is attached to the box-shaped structure portion 11a, and the pin hole of the holder 13 into which this pin 15 is inserted is a long hole 13a. Also, the holder 13
A load detector (compression type load cell) 16 is attached inside the. The hook 12 is connected to the lower portion of the holder 13 by a pin 14. Hook 12 is free to rotate via bearings, as indicated by the arrows in FIGS. 2 and 3. The load from the hook 12 is transmitted to the pin 14, the holder 13, and the load detector 16, and the load detector 16 moves to the pin 15
Press down to detect the load from the reaction force. The load detector is not limited to that of this embodiment, and may be any other one as long as it is attached between the hanger 11 and the hook 12.

A hook metal 17 for storing the hook 12 or the hanger 11 is attached to the lower surface of the arm 3 on the boom 2 side. In this embodiment, the hook 12 is hooked on the hook metal fitting 17.

At the time of crane work, as shown in FIG. 1, the hanger 11 is hung from the tip of the arm 3, the bucket cylinder 7 is contracted to the shortest, and the tip of the pawl 4b is kept away from the hanger 11. In this state, the load is lifted with the hook 12 and the boom cylinder 5,
The arm cylinder 6 is expanded and contracted, and the shovel body 1 is swung to move the load.

As shown in FIG. 4, when the arm cylinder 6 is extended to bring the arm 3 toward you, the tip of the claw 4b comes into contact with the hanger 11, but the lower end 11a of the hanger 11 has a box-shaped structure. Therefore, the load detector 16 inside is protected from being damaged. Also, the tip of the nail 4b should be
It is possible to prevent swinging of the load by restricting swinging in the front-back direction about the pin 10 of 11. Also, since the hanger 11 has a rigid structure, there is no swinging of the load when turning, and the hanger 11,
Since the hook 12 is in front of the bucket 4 (on the side of the excavator main body 1), the operator can always monitor and work safely.

When storing the hanger 11 and the hook 12, the tip of the claw 4b of the bucket 4 is brought into contact with the box-shaped structure portion 11a of the hanger 11, and the bucket cylinder 7 is further extended, as shown in FIG. Then, the hanger 11 and the hook 12 are in the arm 3
Folds underneath.

To change from the state shown in FIG. 6 to the stored state shown in FIG. 5, the hanger 11 may be lifted by input and the hook 12 may be hooked on the hooking metal member 17, or the following may be done. That is, by interposing a lightweight block between the box-shaped structure portion 11a and the tip of the claw 4b in advance, the hanger 11 and the hook 12 are further folded only by operating the bucket cylinder 7, and the hook 12 is positioned on the hook metal fitting 17. It can be matched and hooked. The center of rotation of bucket 4 and hanger 11 is the same pin
Because it is 10, the tip of the claw 4b and the box-shaped structure when folding
The contact part with 11a does not come off, and the claw 4b
There is no danger that the tip of the will get caught.

When carrying out bucket work, attach the hanger 11 to the bottom surface of the arm 3.
Since the hook 12 is stored, the boom 2, the arm 3 and the bucket 4 do not interfere with each other. That is, the boom 2, the arm 3, and the bucket 4 can be operated to perform the bucket work without any trouble. In consideration of the stored state, the upper part of the hanger 11 interferes with the arm 3 and the first link 8, so that the hanger 11 cannot have a box-shaped structure.

〔The invention's effect〕

 According to the invention described above, the following effects can be obtained.

(1) Since the hanger has a rigid structure, there is no lateral shake of the hook when turning the excavator body, and less load shake.

(2) Since no wire rope is used, there is no concern about irregular winding or wire breakage, which is peculiar to wire rope.

(3) Since the lower end portion of the hanger 11 is provided with a plate-like portion that does not hinder the tip of the pawl of the bucket coming into contact with the hanger 11, it is not damaged.

(4) For storing the hanger and hook on the arm,
This can be done by rotating the bucket.

(5) By storing the hanger and the hook, the bucket work can be performed without any trouble.

(6) To modify the arm, simply attach the hook.

[Brief description of drawings]

FIGS. 1, 4, 5, and 6 are side views showing an embodiment of the present invention. FIG. 1 is a crane working state, FIG. 4 is a state in which a bucket is brought close to a hanger, and FIG. FIG. 5 shows the storage state of the hanger and the hook, and FIG. 6 shows the storage state of the hanger and the hook. 2 is an enlarged sectional side view showing the hanger and the hook in FIG. 1, FIG. 3 is a sectional front view of FIG. 2, and FIGS. 7, 8, 9, and 10 are conventional crane devices. It is a side view showing a hydraulic excavator.

Claims (1)

[Claims] 1. A bucket and a rigid hanger having an upper end mounting portion located outside the side plate of the bucket are rotatably supported by pins at the tip of an arm constituting a working machine. The length should be longer than the turning radius of the bucket toe, and a plate-like part should be provided at the lower end of the hanger so that the bucket toe does not come into contact with it. A hydraulic excavator with a crane device that is equipped with hook hook fittings.