JPH0312835Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a kickout device in a boom swing device for a power shovel, which allows the boom device to swing left and right with respect to an upper revolving structure.

In the above boom swing device of a power shovel, an excessive shock is applied to the vehicle body at the left and right stroke ends due to the inertia of the work equipment connected to the boom device and the work in the bucket.

As a countermeasure against this problem, a cushion cylinder is used to absorb the shock near the end of the stroke.However, in conventional examples using this cushion cylinder, the structure is complicated and the cushion cannot be moved unless the stroke is large. The drawback was that the effect was small. The present invention has been developed in consideration of the above-mentioned problems, and it is an object of the present invention to provide a kick-out device for a boom swing device of a power shovel, which has a simple configuration and is capable of obtaining a cushioning effect even in a small swing stroke range before the stroke end. It is something to do.

The configuration of the present invention will be explained below based on the drawings.

In the figure, 1 is a power shovel, 2 is an upper revolving body thereof, and 3 is a boom device provided at the front part of this upper revolving body 2. This boom device 3 is capable of swinging left and right with respect to the revolving upper structure 2, so that the revolving upper structure 2 can be turned to the left or right, and the boom device 3 can be swung to the right or left along with this. This allows the boom assembly to be offset to the left or right, as shown in phantom in FIG.

The present invention is for detecting the stroke end of the swing operation in both left and right directions of the boom device 3 of the power shovel and returning the swing operating lever to the neutral position, and its configuration will be explained below with reference to FIG. 3 and subsequent figures.

In the figure, 4 is a frame of the upper revolving body 2, and 5 is a swing member of a boom device 3 that is swingably attached to this frame 4. This swing member 5 is connected to a swing device such as a cylinder device (not shown). By driving this swing device with hydraulic pressure controlled by a swing valve (none of which is shown), the swing member 5 swings left and right.

Reference numeral 6 denotes an actuating rod connected to the swing valve, and the other end of the actuating rod 6 is connected to a link lever 8 fixed to the boss portion of a swing operating lever 7, so that the swing operating lever 7 can be tilted forward. The swing valve is switched to the right swing position via the actuating rod 6, and is switched to the left swing position by tilting it backward.

Reference numeral 9 denotes a kick-out lever located on the rear side of the swing member 5 and provided on the frame 4 so as to be freely rotatable in the horizontal direction, and the tip of the kick-out lever 9 faces the swing member 5 side. The kick-out lever 9 is connected to the link lever 8 of the swing operating lever 7 via a link device 10, and when the swing operating lever 7 is rotated forward (rightward swing operation), the kick-out lever 9 is moved to the right. When the swing operation lever 7 is rotated backward (left swing operation), the kickout lever 9 is rotated to the left.

The link device 10 has one end connected to a link lever 8.
a first rod 11 connected to the first rod 1;
1, a first lever 12 connected to the other end of the first lever 12;
A second lever 13 that rotates together with the lever 12; and a second rod 14 that has one end connected to the second lever 13.
, a third lever 15 to which the other end of the second rod 14 is connected, a fourth lever 16 that rotates integrally with the third lever 15, and a fourth lever 16 to the above-mentioned kick-out lever 9. 3rd rod 17
At the connecting portion between the second rod 14 and the third lever 15, the rotational direction of the lever is changed from the vertical direction to the horizontal direction.

Kick members 18a and 18b facing the above-mentioned kick-out lever 9 are fixed to both left and right side surfaces of the rear side of the swing member 5 of the boom device 3. The positional relationship between the two kicking members 18a and 18b with the above-mentioned kickout lever 9 is such that when the swinging member 5 swings to the left or right before the stroke end, the kickout lever 9 is in a swinging state to the left or right. The left or right kicking member 18a, 18b is brought into contact with the tip of the lever 9, and then the kickout lever 9 is returned to the neutral position after being swung to the end of the stroke.

In the above configuration, when the swing operation lever 7 is rotated rearward, the swing valve is placed in the left swing position, and the swing member 5 is swung to the left.

At this time, a kick-out lever 9 is connected to the swing operating lever 7 via a link device 10.
has been rotated to the L position, which is the swing operation state to the left.

In this state, the swing member 5 continues to swing to the left. Then, before the stroke end, the left side kick member 18a comes into contact with the tip of the kick-out lever 9 which is in the swing operation state to the left, and from this position, as the swing member 5 swings, the kick-out member 18a kicks out. Lever 9
is returned to neutral at the end of the swing stroke. When the kickout lever 9 is returned to the neutral position, the swing operating lever 7 is returned to the neutral position via the link device 10, and the swing member 5 is stopped.

On the other hand, when the swing operating lever 7 is rotated forward, the swing member 5 is swung to the right.

At this time, the kick-out lever 9 has been rotated to the R position, which is the swing operation state to the right.

In this state, the swing member 5 continues to swing to the right. Then, before the stroke end, the right-side kick member 18b comes into contact with the kick-out lever 9 that is swinging to the right, and from this position, as the swing member 5 swings, the kick-out lever 9 is moved by the kick member 18b. returned,
At the end of the swing stroke, the swing member 5 is returned to the neutral position, and the swing operating lever 7 is thereby returned to the neutral position and the swing member 5 is stopped.

At the end of the stroke in the left and right swings, the swing operating lever 7 is gradually returned by being returned in conjunction with the kick-out lever 9 returned by the kicking members 18a and 18b. Therefore, the swing valve is gradually narrowed by this swing operation lever 7,
The amount of oil supplied to the swing drive device is gradually reduced, and the swing speed from before the stroke end to the stroke end is accordingly reduced.
It is gradually stopped at the end of the stroke.

The present invention is as described above, and in a boom swing device for a power shovel in which the boom device 3 can swing left and right with respect to the upper revolving structure 2, the swing member 5 of the boom device 3 is mounted on the upper revolving structure 2 side. A kick-out lever 9 is provided in the vicinity of the swing operating lever 7 so as to be rotatable in the left-right direction.
Kick members 18a and 18b are connected to the swing member 5 through the swing member 5 and contact the tip of the kick-out lever 9 during the period from before the stroke end to the stroke end of the swing of the swing member 5 in the left-right direction. Since the kick-out device is constructed by fixing the shaft, the link mechanism simplifies the construction, and the cushioning effect can be obtained even in a small swing stroke range before the end of the stroke.

[Brief explanation of drawings]

Fig. 1 is a plan view of a power shovel to which the present invention is applied, Fig. 2 is a side view, Fig. 3 and the following show examples of the present invention, and Fig. 3 is a plan view schematically showing the main parts. Figure 4 is a view taken along the line in Figure 3;
Fig. 5 is a cross-sectional view taken along the line - in Fig. 3, Fig. 6 is a cross-sectional view taken along the - line in Fig. 3, Fig. 7 is a cross-sectional view taken along the - line in Fig. 3, and Fig. 8. is − in Figure 3.
FIG. 3 is a cross-sectional view taken along the line. 2 is an upper rotating body, 3 is a boom device, 5 is a swing member, 7 is a swing operation lever, 9 is a kick-out lever, 10 is a link device, 18a, 18b
is a hard part.

Claims (1)

[Scope of utility model registration request] In the boom swing device of a power shovel in which the boom device 3 can be swung left and right with respect to the upper revolving structure 2, a kick-out lever 9 is provided on the upper revolving structure 2 side and near the swing member 5 of the boom device 3. Provided with free rotation in the left and right direction,
This kick-out lever 9 is connected to the swing operation lever 7 via a link device 10, and is connected to the swing member 5 from before the stroke end to the stroke end of the swing member 5 in the left-right direction. A kick-out device for a boom swing device of a power shovel, characterized in that kick members 18a and 18b that abut the tip of a kick-out lever 9 are fixed.