JPH074558U - Super small turning power shovel - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an ultra-small swing power shovel having an interference prevention mechanism for preventing interference between a working machine and a cab. [Structure] An ultra-small swing power shovel in which an upper swinging body 2 rotatably provided on a lower traveling body 1 is provided with an offset working implement 3 and a driver's cab 4, and a first boom 6 of the working implement 3 is provided. , The tip boom 6 is attached to the tip of the first boom 6.
When the working machine 3 is lifted to the cab 4 side while being offset between the second booms 7 pivotally connected via a
Since the rear end of the third boom 8 pivotally attached to the tip of the boom interferes with the operator's cab 4 and the interference preventive mechanism 12 for stopping the rising of the working machine 3 is provided, the working machine 3 has a simple structure. Only by providing the interference prevention mechanism 12, it is possible to prevent the working machine 3 and the cab 4 from interfering with each other.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an ultra-small swing power shovel that prevents interference between a working machine and a cab.

[0002]

[Prior art]

 In a conventional ultra-small swing power shovel equipped with a work implement having an offset boom, the work implement may interfere with the cab depending on the posture of the work implement.

In order to prevent this, conventionally, the rotation angle of the working machine is detected by a detector such as a potentiometer, the position of the working machine is calculated by the controller, and the working machine hydraulic pressure is adjusted so that the working machine does not interfere with the cab. By controlling the solenoid valve provided in the circuit, or by providing a cam b on the offset boom a as shown in FIG. 1 and forcibly pushing the slide plate c to the arm d side by this cam b, The operation is regulated to prevent the arm d from interfering with the cab.

[0004]

[Problems to be solved by the device]

 However, the former method has a drawback that the control system is complicated and therefore expensive. In the latter method, the work range at the time of offset is regulated, so that workability is reduced. The present invention has been made in order to solve such a problem, and an object thereof is to provide an ultra-small swing power shovel provided with an interference prevention mechanism for preventing the interference between the working machine and the cab.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides an ultra-small swing power shovel in which an upper swing body that is swingably provided on a lower traveling body is provided with an offset freely movable working machine and a driver's cab. When the work implement is lifted to the cab side between the boom and the second boom pivotally attached to the tip of the first boom via the tip boom, the work machine is attached to the tip of the second boom. It is equipped with an interference prevention mechanism that stops the lifting of the work implement before the rear end of the pivotally mounted third boom interferes with the cab.

[0006]

[Action]

 With the above configuration, even when the work implement is lifted in a state where the work implement is offset to the cab side, the work is stopped before it interferes with the cab, so that work can be performed safely.

[0007]

【Example】

 An embodiment of the present invention will be described in detail with reference to the drawings shown in FIGS. In these figures, reference numeral 1 denotes a self-propelled lower traveling body, and an upper rotating body 2 is rotatably provided on the lower traveling body 1. On the upper revolving structure 2, for example, a working machine 3 is provided on the left side and a driver's seat 4 is provided on the right side, and a driver's cab 5 such as a canopy or a cabin that also functions as a side guard is provided between them. It is erected.

The working machine 3 has a first boom 6 that can be raised and lowered by a boom cylinder (not shown), and a tip boom 6 a is pivotally attached to the tip of the first boom 6, and this tip boom is A link 8 connects the 6a and the upper revolving superstructure 2, and the link 8 and the first boom 6 form a four-bar link.

A second boom 7 is pivotally attached to the tip of the tip boom 6a, and a third boom 8 is pivotally attached to the tip of the second boom 7 in a vertically rotatable manner. An arm 9 is attached to the tip of 8, and a bucket 10 is attached to the tip of the arm 8.

On the other hand, an interference prevention mechanism 12 is provided between the first boom 6 and the second boom 7 of the working machine 3 for preventing the working machine 3 and the operator's cab 5 from interfering with each other. As shown in FIGS. 3 and 4, the interference prevention mechanism 12 has a connecting rod 14 whose one end side is pivotally attached to the tip side of the first boom 6 by a pin 13, and the other end of the connecting rod 14 is A pin 16 and a roller 17 are pivotally attached to one end of the lever 15.

The other end of the lever 15 is supported by a pin 18 projecting from the lower surface of the base end side of the second boom 7, and a tip end interposed between the first boom 6 and the second boom 7. A stopper 19 is fixed to the lower surface of the boom 6a. The stopper 19 is substantially fan-shaped, and has a circular arc surface 19a that stops the rotation of the second boom 7 when the working machine 3 is offset to the left and a transition from the right offset to the left offset at the maximum position of the working machine. It has a stop surface 19b for stopping.

Next, the operation will be described. When the work implement 3 is lifted with the work implement 3 offset to the left, the rear end of the third boom 8 operates when the position exceeds the position indicated by the phantom line A in FIG. The cab 5 is damaged by interfering with the cab 5. However, due to the addition of the interference prevention mechanism 12, when the working machine 3 is lifted while being offset to the left, when the working machine 3 reaches the position shown by the phantom line A in FIG. 2, (a) in FIG. As shown in, the roller 17 provided at the tip of the lever 15 contacts the circular arc surface 19a of the stopper 19 and prevents the working machine 3 from being further raised. This can prevent the rear end of the third boom 8 from interfering with the cab 5.

Further, when the working machine 3 is offset to the right side, even if the working machine 3 crosses the imaginary line A in FIG. 2, the roller 7 of the lever 15 moves to the stopper 19 as shown in (b) of FIG. Since there is no contact, the working machine 3 can be raised to the highest position of the phantom line B in FIG.

On the other hand, if the working machine 3 that has been lifted to the highest position while being offset to the right side is to be offset to the left side, the rear end of the third boom 8 interferes with the operator cab 5. However, when the working machine 3 which is offset to the right side at the highest position as shown in (a) of FIG. 6 is attempted to be offset to the left side, the roller 17 of the lever 15 is moved as shown in (b) of FIG. Since the stopper 19 is brought into contact with the stop portion 19b to prevent the offset to the left side, it is possible to prevent the rear end of the third boom 8 from interfering with the cab 5.

7 to 9 show another embodiment of the interference prevention mechanism 12, which will be described below. As shown in FIGS. 7 and 8, the interference prevention mechanism 12 includes the first boom 6 as shown in FIG. A slide plate 25 is provided on the tip boom 6a provided at the tip of the slide plate 25. The slide plate 25 has a plurality of elongated holes 25a in a direction parallel to the axis of the first boom 6, and the tip of a fixing tool 27 inserted through the collar 26 into these elongated holes 25a is attached to the tip boom 6a. By being screwed onto the upper surface, it is attached so as to be movable in the front and rear directions of the tip boom 6a.

One end side of the slide plate 25 is connected to the front end side of the first boom 6 by a link 27, and an arcuate stop surface 25b is formed on the other end side. Then, the roller 29 attached via the bracket 28 to the base end side of the second boom 7 is brought into contact with the stop surface 25b to prevent interference.

Next, the operation will be described with reference to (a) to (c) of FIG. 9. In the state where the working machine 3 is offset to the right side, even if the working machine 3 is lifted, As shown in (a), since the roller 29 does not come into contact with the stop surface 25b of the slide plate 25, the working machine 3 can be raised to the position shown by the imaginary line B in FIG. 7, but to the left side. When the work implement 3 is lifted in the offset state, the stop surface 25a of the slide plate 25 pushed forward when the work implement 3 is raised to the virtual line A in FIG. 7 is shown in FIG. As described above, the working machine 3 cannot be further raised by coming into contact with the roller 29, so that the rear end of the third boom 8 does not interfere with the cab 5.

Further, when the working machine 3 which has been lifted to the highest position in the state of being offset to the right side is to be offset to the left side, the roller 29 comes into contact with the side surface of the slide plate 25 as shown in (c) of FIG. Since it cannot be further offset to the left side, it is possible to prevent the rear end of the third boom 8 from interfering with the cab 5.

[0019]

[Effect of device]

 As described in detail above, when the work implement is lifted in a state where the work implement is offset to the driver's cab, the interference prevention mechanism operates the work implement before the work implement interferes with the operator's cab. Since it is stopped, it is possible to prevent the working machine from interfering with the cab. In addition, it does not require a complicated control system as compared with the conventional system that controls the hydraulic circuit so that the working machine detects the angle of the working machine and does not interfere with the operator's cab. Since the working range of the working machine is not limited except in the area where the cab and the cab interfere with each other, workability is not impaired.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a work machine of a conventional ultra-small turning power shovel.

FIG. 2 is a side view of an ultra-small turning power shovel according to an embodiment of the present invention.

FIG. 3 is an exploded perspective view of an interference prevention mechanism provided in a working machine for an ultra-small swing power shovel according to an embodiment of the present invention.

FIG. 4 is a view taken in the direction of the arrow X in FIG.

5 (a) is an explanatory view of the operation of the interference prevention mechanism. FIG. (B) It is an operation explanatory view of an interference prevention mechanism.

FIG. 6A is an explanatory view of the operation of the interference prevention mechanism. (B) It is an operation explanatory view of an interference prevention mechanism.

FIG. 7 is a side view of an ultra-small turning power shovel according to another embodiment of the present invention.

FIG. 8 is an exploded perspective view of an interference prevention mechanism provided in a working machine of an ultra-small turning power shovel according to another embodiment of the present invention.

9 (a) is an explanatory view of the operation of the interference prevention mechanism. FIG. (B) It is an operation explanatory view of an interference prevention mechanism. (C) It is an operation explanatory view of the interference prevention mechanism.

[Explanation of symbols]

 1 Lower Traveling Body 2 Upper Revolving Body 3 Working Machine 4 Operator's Cab 6 First Boom 6a Tip Boom 7 Second Boom 8 Third Boom 12 Interference Prevention Mechanism 14 Connecting Rod 15 Lever 17 Roller 19 Stopper 25 Slide Plate 29 Roller

Claims (3)

[Scope of utility model registration request] 1. A work machine 3 and a driver's cab 4 which can be offset to an upper revolving structure 2 which is revolvably provided on a lower traveling structure 1.
In the ultra-small turning power shovel provided with
Between the first boom 6 and the second boom 7 pivotally attached to the tip of the first boom 6 via the tip boom 6a, when the working machine 3 is lifted to the cab 4 side in an offset state. ,
An ultra-small swing power shovel provided with an interference prevention mechanism 12 for stopping the lifting of the work implement 3 before the rear end of the third boom 8 pivotally attached to the tip of the second boom interferes with the cab 4. 2. The interlocking mechanism 12 includes a connecting rod 14 and a lever 15 provided between the first boom 6 and the second boom 7.
The ultra-small swing power shovel according to claim 1, which comprises a stopper 19 for stopping the operation of the working machine 3 via a roller 17 provided at a pivotal portion of the connecting rod 14 and the lever 15. 3. The interference prevention mechanism 12 is provided on the tip boom 6a, and is moved forward and backward as the working machine moves up and down. The slide plate 25 is provided on the side of the second boom 7 and is in contact with the slide plate 25. Working machine 3 by touching
2. A roller 29 which stops the operation of
Ultra-small turning power shovel described.