JPS5914520Y2 - Arm folding device at the front end of the boom using cables - Google Patents

Description

[Detailed description of the invention] Conventionally, a boom that is cantilever-supported on a vehicle via a boom cylinder so that it can be raised and lowered freely, and an arm that is pivoted to the front end of the boom so that it can be moved up and down are connected by an arm cylinder. When moving construction machinery to a work site, it is common to transport it by loading it onto another vehicle, but as the construction machinery grows larger, the maximum height during transportation is limited even if it is mounted on a low-floor trailer. In order to overcome the restrictions imposed by traffic regulations, the arm cylinder must be uncoupled from the arm and the arm must be folded under the boom.

The present invention relates to a device for folding the arm at the front end of the boom using a cable in such a case.

The present invention relates to a construction machine in which an arm is pivotally movable up and down on the front end of a boom that is cantilever-supported on a vehicle via a boom cylinder so that the arm can move up and down. A cable 2 is detachably stretched via a pulley 1 between the lower part of the boom side pivot point of the arm hanging from the front end in the upright state and the boom pivot base at the rear of the boom. It is characterized in that the arm is drawn to the boom via the cable 2 when the boom is lowered.

The figure shows an embodiment of the present invention, in which a boom pivot base 4 rotatably mounted on a crawler-type traveling device 3 is provided with a driver's cab 5 and an engine 6, and the boom pivot base 4 and the A boom cylinder 9 connects the base of the boom 8 which is pivoted by a foot pin 7 to the base of the boom 8 .

At the base end of the arm 11 which is pivotally attached to the front end (tip) of the boom 8, there is a pin 1 to which the tip of the piston rod of an arm cylinder 13, whose cylinder base end is pivotally attached to the boom, is detachably attached.
4, and the boom 8 is provided with a fastener 15 to which the tip of the piston rod of the arm cylinder 13 that is most contracted is fixed with a pin 14.

Reference numeral 16 denotes an operating cylinder whose base end 17 is pivotally mounted on the arm 11. At the tip of the piston rod of the operating cylinder 16, one end of a guide link 18 and a link 19 on both sides are pivoted together by a pin 20. The other end of the guide link 18 is pivotally mounted 21 on both sides of the arm 11.

The other end of the link 19 is removably pivoted 24 to a tool 23 which is pivotally connected to the tip of the arm 11 by a removable pin 22.
The tool 23 is rotated about the pin 22 by the actuating cylinder 16.

The illustrated tool 23 is a scissor-shaped cutting machine equipped with a fixed blade 23a and a movable blade 23b that is opened and closed by a built-in hydraulic cylinder, and cuts various parts of the building, reinforcing bars, etc.

It has the ability to destroy.

As shown in FIG. 4, the pulley 1 is rotatably attached to the pin receiver 8a of the boom 8 coaxially with the boom-side connecting pin 25 of the boom cylinder 9, and both ends of the cable 2 passing through the pulley 1 are The pin 22 at the tip of the arm 11, which hangs down by its own weight from the front end of the boom 8 which is erected as shown by the solid line in FIG. It is locked.

The cable 2 shown in the figure is made longer than the length required for folding the arm so that it can be used for replacing the arm cylinder 13 (described later). It is installed on base 4.

Therefore, when the arm is folded or swung out, the cable 2 functions in the same manner as if its both ends were connected to the pin 22 and the pulley 27 mounting position on the boom pivot base 4.

The arm cylinder 13 replacement device is installed on the base end of the arm 11 when the arm cylinder 13 is fully contracted and the tip of the arm 11 is brought into contact with the ground due to the collapse of the boom 8 as shown in Fig. 2. The cable 2 is hung around the pulley 28, and the S-shaped hook 29 detachably attached to one end of the iron cable is engaged with the piston rod of the arm cylinder 13, and the other end is detachably attached to the pin 30 at the upper end of the guide link 18. The arm cylinder 13 is locked to the arm 11 by the expansion and contraction of the actuating cylinder 16, and the position where the arm cylinder 13 is connected to the arm and the fixing tool 1 are adjusted.
It is configured to be able to move up and down between the fixed position and the fixed position at 5.

Reference numeral 31 indicates a connecting pin on the boom pivot base 4 side of the boom cylinder 9.

When transporting construction machinery on a trailer, first extend the arm cylinder 13 and operating cylinder 16, and then extend the boom 8.
After the tool 23 is supported on the ground or other transport vehicle, the pivot pins 22, 24 are removed and the tool 23 is removed from the end of the arm 11.

Next, the tip of the arm 11 is supported on the ground G as shown in FIG. 2 by maximally contracting the arm cylinder 13 and horizontally lowering the boom 8.
3 between the piston rod and the pin 300, the weight of the arm cylinder is applied to the cable 2, and the tip of the arm cylinder is replaced from the arm 11 to the fastener 15 by contracting the operating cylinder 16.

Next, the cable 2 stretched between the arm cylinder 13 and the pin 30
The boom 8 is raised as shown by the solid line in Figure 3, and the cable 2 is stretched between the pin 22 of the arm 11 hanging from the front end of the boom and the hook 26 via the pulleys 1 and 27. After that, the boom cylinder 9 is contracted to lower the boom 8 to the position shown by the chain line in the figure.

Then pulley 1. While the distance between the foot pins 7 is constant, the distance between the pulleys 1 and 27 gradually increases as the boom is lowered, so the arm 11 is drawn below the boom 8 as shown by the chain line in the figure.

Therefore, the boom 8 and the arm 11 are connected by a detachable tie rod 32.

To connect the arm cylinder 13 to the arm 11 again after transporting the trailer, remove the tie rod 32 and stand the boom 8 up, remove the cable 2 from the pulley 1, hook 26, etc., then fold down the boom 8 and connect the arm 11. After the tip of the boom 11 is grounded, the crawler 3 is moved backward while the boom 8 is further lowered to return the boom and the arm 11 to the position shown in FIG. The end of the arm cylinder is transferred from the fastener 15 to the arm 11 by the extension of the cylinder 16.

Although one embodiment has been described above, the present invention utilizes the increase in the cable length between the pulley 1 and the boom pivot base side connecting portion 27 of the cable 2 that occurs when the boom 8 is brought down from an upright position. , since the arm 11 is drawn to the boom 8, the cable 2
It is clear that it is sufficient to connect the arm to a portion below the boom-side pivot point 10 of the arm.

The illustrated pulley 1 is connected to the boom side connecting pin 2 of the boom cylinder 9.
The reason why the cable 2 is attached coaxially with the connecting pin 25 is to prevent the cable 2 from interfering with the connecting pin 25.

According to the present invention, both ends of the cable 2 passing through the pulley 1 are connected to the boom pivot base 4 to the lower part of the boom-side pivot point of the arm 11 hanging down from the front end of the boom 8 in front and behind the upright boom 8. In addition, since the length of the iron cable 2 is set to a length that allows the boom to be tensioned in the upright state, the arm can be folded and swung out safely by using the upward and upward movement of the boom by the boom cylinder 9, and moreover, when the arm is folded, Since the boom is laid down, the tie rod 32 can be easily attached and detached.

[Brief explanation of the drawing]

Figure 1 is a side view of the entire construction machine, Figure 2 is a side view of the main parts during connection release between the arm cylinder and arm, and Figure 3
The figure is a side view of the main parts while the arm is retracted, and Figure 4 is a side view of the main parts when the arm is retracted.
This is a sectional view taken along line XX in the figure. 3...Crawler type traveling device, 4...Boom pivot base, 8...Fam, 9...
・Fam cylinder, 11...Arm, 13.
...Arm cylinder, 16...Operating cylinder, 23...Tool, 25...Boom side connecting pin of boom cylinder.

Claims (2)

[Scope of utility model registration request] (1) In a construction machine in which an arm is pivoted to the front end of a boom that is cantilever-supported on a vehicle via a boom cylinder so that it can move up and down, a pulley 1 attached to the side wall of the middle part of the boom and a boom includes a cable 2 that is removably stretched via a pulley 1 between the lower part of the boom-side pivot point of the arm hanging from its front end and the boom pivot base at the rear of the boom. An arm folding device at the front end of a boom using a cable, characterized in that the arm is drawn to the boom via a cable 2 when the boom is lowered. (2) An arm folding device at the front end of a boom using a rope according to claim (1), in which a pulley 1 is attached coaxially with a boom-side connecting pin of a boom cylinder.