JPH0328067Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a hose guide device for a crane having a folding boom.

(Prior Art) As shown in FIG. 4, a first boom 3, an outer cylinder 4 and It is telescopically inserted into the outer cylinder 4, and in its contracted state, its proximal end protrudes rearward from the proximal opening 5 of the outer cylinder 4, and in its most extended state, its proximal end extends inside the outer cylinder. a telescopic boom 7 comprising an inner cylinder 6 configured to be located at the first boom 3;
The crane has a folding boom equipped with a telescoping boom 7 whose outer cylinder 4 base end is pivoted to the tip end of the first boom 3 so as to be driven up and down at a position offset to one side. A hydraulic gripping device 8 such as a club bucket is attached to the tip of the telescopic boom 7, and the hydraulic gripping device 8 grips the cargo to be handled, and the telescopic boom 7 is extended, contracted and raised and lowered, and the first boom 3 is raised and lowered. , and has been widely used in recent years to perform crane work by rotating the rotating base 2. For this reason, a crane having this type of folding boom has a rotating base 2 or a first boom 3 and a telescopic boom 7.
An oil supply hose 9 for driving the hydraulic gripping machine 8 is stretched between the tip end of the hydraulic gripping machine 8 and the hydraulic gripping machine 8. That is, the oil supply hose 9 pulled out from the hose reel 10 disposed on one side of the first boom 3 or the swing base 2 is inserted into the base end opening 11 of the inner cylinder 6 of the telescopic boom 7. It is led to the tip of the telescopic boom 7 through the inside of the cylinder 6.

In the case of a crane having a bending boom to which an oil supply hose is stretched, the first boom 3
When the telescopic boom 7 is driven up and down against the
1 or the proximal end opening 5 of the outer cylinder 4 and may be damaged, conventionally the following hose guide device has been provided. That is, in FIG. 4, the hose guide device includes a hose guide 15 consisting of a guide pulley 13 that guides the hose 9 along the way, and a pulley support 14 that rotatably supports the pulley 13, and this hose guide. and a guide device 16 for attaching the tool 15 to the outer cylinder 4. The guide device 16 moves the guide pulley 13 of the hose guide 15 to a forward position close to the proximal opening 5 of the outer cylinder 4 of the telescopic boom 7, and from this forward position backward along the contraction direction of the telescopic boom. This guides the pulley support 14 in the hose guide 15 so that it can be moved to and from the rear position.

A conventional hose guide device for a crane having a folding boom configured in this manner has a telescopic boom 7.
When the tube is extended (maximum extension), that is, the proximal end of the inner cylinder 6 is located inside the outer cylinder 4, the hose guide 15 is in a position close to the proximal opening 5 of the outer cylinder 4, and the telescopic boom 7 is in a reduced state, that is, the inner cylinder 6
When the base end of the hose guide 15 protrudes rearward from the base opening 5 of the outer cylinder 4, the pulley support 1 of the hose guide 15
4 abuts the proximal end of the inner cylinder 6, and the hose guide 15 moves rearward together with the inner cylinder 6. Therefore, the hose 9 is connected to the proximal openings of the outer cylinder 4 and the inner cylinder 6 of the telescopic boom 7. Telescopic boom 7 without sliding contact with
They are guided inward.

(Problems to be solved by the invention) However, in the case of the above-mentioned conventional hose guide device for a crane having a folding boom,
The tension of the hose 9 applies a biasing force F ₁ to the hose guide 15 in a direction perpendicular to the moving direction of the hose guide (the direction of extension and contraction of the telescopic boom 7), and this biasing force
Since F ₁ acts on the guide device 16, the guide device 1
6 had to be made sufficiently strong.

In addition, in the case of the conventional hose guide device, the movement of the hose guide 15 to the front position close to the proximal opening 5 of the outer cylinder 4 is caused by the tension of the hose 9 bent and guided by the hose guide 15. (component force along the direction of extension and contraction of the telescopic boom 7) F2 generated based on _F2 .
In a state in which the telescopic boom 7 is lifted up so that the telescopic boom 7 has a substantially linear shape, that is, in a state in which the bending angle of the hose 9 by the hose guide 15 is extremely small, this component force F ₂ is extremely small. Therefore, even if the telescopic boom 7 is extended from the contracted state in this state, the hose guide 15 remains behind. From this state, when the telescopic boom 7 is lowered relative to the first boom 3, the bending angle of the hose 9 by the hose guide 15 gradually increases, and the component force _F2 gradually increases accordingly. , the hose guide 15 suddenly moved forward and collided with the rear end opening 5 of the outer cylinder 4, causing damage to the hose guide 15 or the guide device 16.

(Means for Solving the Problems) In order to solve the above-mentioned problems of the prior art, the present invention provides a conventional hose guide device with a spring that biases the hose guide tool 15 toward the front position. Pulley support 14 of hose guide 15
When the pulley support 14 collides with the proximal end of the inner cylinder 6 of the telescopic boom 7 in the contracted state, it engages with the proximal edge of the cylinder wall of the inner cylinder 6 and closes the guide pulley in the hose guide 15. 13 is provided with an engaging recess that maintains the inner cylinder 6 at a predetermined position corresponding to the proximal opening 11 of the inner cylinder 6.

(Function) In the hose guide device for a crane having a folding boom according to the present invention configured as described above, the hose guide device 15 is always urged in the forward position direction by the spring, so that the hose guide device 15 is attached to the telescopic boom 7. However, it abuts against the base end of the inner cylinder 6 of the telescopic boom 7 which is in the contracted state, and when the inner cylinder 6 is extended like the conventional one. Nevertheless, the hose guide 15 will not be left behind at the rear position. Therefore, the component force F ₂ generated by the hose guide 15 due to the tension of the hose 9
This prevents it from running out of control and colliding with the base end of the outer cylinder 4.

In addition, when the telescopic boom 7 is contracted, the hose guide 15 is moved rearward as its pulley support 14 collides with the base end of the inner cylinder 6. In the state of abutment with the end, the engagement recess provided in the pulley support 14 engages with the proximal edge of the inner cylinder 6, and the guide pulley 13 of the hose guide 15 is brought into contact with the proximal end of the inner cylinder 6. Since the hose guide 15 is maintained in a predetermined position facing the opening 11,
Even if a biasing force F ₁ in a direction perpendicular to the moving direction of the hose guide 15 acts, this biasing force F ₁ does not act on the guide device 16 and is supported by the proximal edge of the cylinder wall of the inner cylinder 6. be done. Therefore, the guide device 16 can be simplified compared to conventional ones.

(Example) An example of the present invention will be described below based on FIGS. 1 and 2. The reference numerals 1 to 16 shown in FIG. 4 and used in the description of the prior art described above are also used in the following description as having the same meaning.

In FIGS. 1 to 3, the hose guide device includes a guide pulley 15 of a hose guide device 15 that includes a guide pulley 13 that guides the hose 9 midway, and a pulley support 14 that rotatably supports the guide pulley 13. 13 is located at a front position (the position shown in FIG. 3) close to the proximal end opening 5 of the outer cylinder 4 of the telescopic boom 7, and at a rear position (first The pulley support 14 of the hose guide 15 is attached to the outer cylinder 4 of the telescopic boom 7 via a guide device 16 so as to be movable between the hose guide 15 and the position shown in the figure. Although such a configuration is the same as that of the prior art, the hose guide device of the present invention includes a spring 1 that biases the hose guide tool 15 toward the front position (the position shown in FIG. 3).
7 is provided on the pulley support 14 of the hose guide 15, and when the pulley support 14 collides with the base end of the inner cylinder 6 of the telescopic boom 7 in the contracted state, the inner cylinder 6 An engagement recess 18 is provided which engages with the proximal edge of the cylinder wall to maintain the guide pulley 13 of the hose guide 15 at a predetermined position corresponding to the proximal opening 11 of the inner cylinder 6. In the case of this embodiment, the engagement recess 18 is formed into a U-shape in side view so as to engage with the base end of the inner cylinder 6, particularly the base end edge of the bottom plate of the inner cylinder 6. The recess 18 is the inner cylinder 6
When the hose guide 1 is engaged with the proximal edge of the bottom plate of
A guide pulley 13 at 5 is positioned within the proximal opening 11 of the inner cylinder 6.

The hose guide device configured in this way operates as follows. As shown in FIG. 1, when the telescoping boom 7 is raised so that it is approximately linear with respect to the first boom 3, and the telescoping boom 7 is contracted, the hose guide 15 is biased toward the forward position by the spring 17, the hose guide 15 abuts against the base end of the inner cylinder 6 of the telescopic boom 7. That is, the engagement recess 18 provided in the pulley support 14 of the hose guide 15 engages with the proximal edge of the cylinder wall of the inner cylinder 6, and the guide pulley 13 of the hose guide 15 is connected to the proximal opening of the inner cylinder 6. 11. Therefore, the hose guide device 1 described in the prior art
Even if a biasing force F ₁ in a direction perpendicular to the moving direction of the hose guide 15 acts on the guide device 16 , this biasing force F ₁ does not act on the guide device 16 and is supported by the base end of the inner cylinder 6 .

Next, when the telescopic boom 7 is extended from this state (with the base end of the inner cylinder 6 still protruding rearward from the base opening 5 of the outer cylinder 4), the hose guide 15 is moved by the spring 17. Since it is urged in the direction of the forward position, it is in the same state as above.

When the telescopic boom 7 is further extended as shown in FIG.
7 in the forward position direction, the hose guide 15 abuts against the proximal end of the outer cylinder 4 of the telescopic boom 7. That is, the engagement recess 18 provided in the pulley support 14 of the hose guide 15 engages with the edge of the proximal opening 5 of the outer cylinder 4, and the guide pulley 13 of the hose guide 15 is connected to the proximal end of the outer cylinder 4. It is maintained in a predetermined position opposite the opening 5. Therefore, even in this case, the biasing force F ₁ is caused by the guide device 16
It is supported by the proximal edge of the outer cylinder 4 without acting on it.

Further, in the case where the telescopic boom 7 is contracted from the extended state in the opposite manner to the above, the same effect as described above is obtained.

In the above, a case has been described in which the telescopic boom 7 is raised and retracted so that the telescopic boom 7 is approximately linear with respect to the first boom 3, but the telescopic boom 7 is We will explain the case where the line falls down (the case where the line does not form a substantially linear shape). In this case, as explained in the prior art, as the bending angle of the hose 9 by the hose guide 15 gradually increases, the component force F ₂ generated by the tension of the hose 9 gradually increases. Due to the biasing force of F ₂ and the spring 17, the hose guide 15 moves the inner cylinder 6 more strongly than in the case described above, in which the telescopic boom 7 is raised so that the telescopic boom 7 is approximately linear with respect to the first boom 3. Alternatively, it abuts against the base end of the outer cylinder 4. Therefore, in this case as well, the biasing force F ₁ does not act on the guide device 16 but on the proximal edge portion of the inner cylinder 6 or the outer cylinder 4.

As described above, attach the hose guide 15 to the spring 1.
Since the hose guide 15 is always urged in the forward position direction by the hose 7, the hose guide 15 is always engaged with the base end of the inner cylinder 6 or the outer cylinder 4 regardless of the bending angle of the hose 9. . In other words, when the base end of the inner cylinder 6 protrudes rearward from the base opening 5 of the outer cylinder 4, the engagement recess 18 provided in the pulley support 14 of the hose guide 15 is inserted into the base opening of the inner cylinder 6. The biasing force F1 is applied to the proximal edge of the guide device ₁ by engaging the proximal edge of the guide device 1.
6. In addition, when the base end of the inner cylinder 6 does not protrude rearward from the base end opening 5 of the outer cylinder 4, the engagement recess 18 provided in the pulley support 14 of the hose guide 15 is inserted into the base end opening of the outer cylinder 4. 5 to prevent the biasing force F ₁ from acting on the guide device 16. Even when the telescopic boom 7 is raised in a substantially linear manner with respect to the first boom 3 (when the bending angle of the hose 9 is small), which is a case where the component force F ₂ becomes extremely small, the hose guide Since the tool 15 is biased in the forward position direction by the spring 17, even when the inner tube 6 is extended from the contracted state of the telescopic boom 7, the hose guide tool 15 is not left behind and remains as the inner tube 6 moves. This is engaged with the proximal end of the inner cylinder 6.

Therefore, if the hose guide 15 is left behind and runs out of control when the bending angle of the hose becomes large, it will come into contact with the base end of the inner cylinder 6 or outer cylinder 4 and be damaged. No.

(Effects of the invention) Since the present invention is configured and operates as described above, the biasing force perpendicular to the moving direction of the hose guide does not act on the guide device and is applied to the inner tube or the outer tube. It is supported at the proximal edge of the cylinder wall of the cylinder. Therefore, the guide device can be simplified compared to the conventional one.

Also, when the hose guide is left behind,
There is no possibility that the hose will run out of control and collide with the proximal end of the outer cylinder or inner cylinder due to the component of hose tension that occurs when the bending angle of the hose becomes large.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a hose guide device for a crane having a folding boom according to the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is an enlarged explanatory diagram of the main parts of FIG. FIG. 4 is an explanatory diagram of a conventional hose guide device for a crane having a folding boom. 1; Vehicle; 2; Swivel base; 3; First boom;
4; Outer cylinder, 6; Inner cylinder, 7; Telescopic boom, 9; Hose, 10; Hose reel, 13; Guide pulley, 1
4; pulley support, 15; hose guide, 16; guide device, 17; spring.

Claims (1)

[Scope of utility model registration request] A first boom whose base end is pivotally supported on a swing base rotatably mounted on a vehicle so that it can be driven up and down; and an inner cylinder configured such that its end protrudes rearward from a proximal opening of the outer cylinder so that its proximal end is located within the outer cylinder in its most extended state, the first boom comprising: a telescopic boom whose outer cylinder proximal end is pivoted to the distal end of the first boom so as to be driven up and down in a position deviated one side laterally; It has a bending boom configured to guide an oil supply hose pulled out from a hose reel placed on the side from the base end opening of the inner cylinder of the telescopic boom, through the inner cylinder, and to the tip of the telescopic boom. A hose guide device for a crane, wherein the guide pulley of the hose guide device includes a guide pulley that guides the hose midway and a pulley support that rotatably supports the pulley. The pulley support of the hose guide is connected to the telescopic boom via the guide device so that it can be moved between a front position close to the opening and a rear position moved rearward from this front position along the direction of extension and contraction of the telescopic boom. A spring is attached to the outer cylinder and biases the hose guide in the direction of the forward position, and the pulley support of the hose guide has a spring attached to the base end of the inner cylinder of the telescopic boom in which the pulley support is in a contracted state. An engagement recess is provided which engages the proximal edge of the cylinder wall of the inner cylinder to maintain the guide pulley in the hose guide at a predetermined position corresponding to the proximal opening of the inner cylinder. A hose guide device for a crane having a folding boom, characterized in that: