JPH0315634Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an arm folding device for a construction work machine.

Conventionally, construction machines for high-altitude work have used long and large booms and arms to enable work at high positions. In such a work machine, the boom and arm are in an extended state during work, and their long length is convenient for working at heights. However, the large size of these attachments poses a serious problem when transporting the equipment by land using a trailer or the like once the work has been completed, or when storing the equipment in a storage area. For this reason, attachments have been disassembled for transportation or storage.

Another idea was to construct the arm with a front arm and a rear arm, attach a hydraulic cylinder between the front arm and the rear arm, and use the hydraulic cylinder to rotate the arm, but the conventional method Even with the use of mechanisms, it was impossible to rotate the front arm completely 180 degrees. Also, if a hydraulic motor is used instead of a hydraulic cylinder, and a pinion, sector gear, etc. are used, the front arm can be rotated completely 180 degrees, but in this case, the structure is complicated and expensive. However, this was not a desirable method.

This invention aims to solve the above problem, and allows the arm to be bent using a simple powered device.

The structure of this invention is that the arm of a construction work machine that has a long boom and arm is divided into front and rear arms, and the rear part of the front arm and the front part of the rear arm are connected with two pins. By removing one of the arms, the front arm can be rotated backwards, and a bracket is provided protruding from the upper part of both arms, and a hydraulic cylinder is installed between the two brackets, and the front part of the hydraulic cylinder is installed. The insertion hole for the pin that connects the arm to the bracket is formed as a long hole facing in the direction of the pin that rotates the arm.

When moving or storing the aircraft, the front arm can be bent backwards, so there is no need to disassemble it for transport, and it also has the advantage of requiring less space for storage.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Reference numeral 1 denotes an arm of a construction work machine. The arm 1 is divided into a front arm 2 and a rear arm 3. The rear part of the front arm 2 and the front part of the rear arm 3 are pivoted at two positions on the left and right using vertical pins 4. Support, its two pins 4, 4
At least one of the arms is detachably provided, and both arms 2 and 3 are connected together. In addition, assuming that the arm is bent in the left and right direction, the left and right 2
By removing the right pin 4 of the book pins 4, the front arm 2 can be rotated 180 degrees rearward. A bracket 5 is provided protruding from the rear upper side of the front arm 2, and a bracket 6 is provided protruding from the rear upper side of the rear arm 3. 2 where the hydraulic cylinder axis connects the front arm 2 and the rear arm 3
Pin 7, so that it is located between pins 4 and 4 of the book.
8 connects a hydraulic cylinder 9. The hole in the bracket 5 of the front arm 2 into which the pin 7 at the front of the hydraulic cylinder 9 fits is formed into an elongated hole 10, and the center line a of the elongated hole 10 is aligned when the front arm 2 rotates. It passes through the center of pin 4 (left side), which is the center of.

The rear lower part of the rear arm 3 is pivoted to the tip of the boom 11, and an arm cylinder 12 is installed between the two. An auxiliary arm 13 is pivotally supported at the front end of the front arm 2, and an auxiliary arm cylinder 14 is installed between the two. 15 is a hydraulic crusher, 16 is a hydraulic cylinder for operating the crusher 15, 1
7 is a working machine main body, and 18 is a boom cylinder.

The present invention is constructed as described above, and during work, both pins 4 connecting the front and rear arms 2 and 3 are inserted, and the front and rear arms 2 and 3 are integrated and function as a normal arm. is fulfilled.

When moving the aircraft 1 after finishing work, or storing it in a equipment storage area, move the front arm 2.
fold backwards. The direction of bending is determined in advance, and the positions of the brackets 5 and 6 and the position of the elongated hole 10 are set based on this. Extend the cylinder 9. The center line c of the hydraulic cylinder 9 is the left pin 4, which is the center of rotation.
Since the hydraulic cylinder 9 is extended, the pin 7 is located at the front end of the elongated hole 10, and the front arm 2 is rotated counterclockwise about the pin 4 (on the left side).
When the center line c of the hydraulic cylinder 9 is on the left pin 4 as shown in FIG. 9, the front arm 2 will no longer rotate. At that point, as shown in FIG. 10, the hydraulic cylinder 9 is slightly contracted so that the pin 7 is positioned near the rear end of the elongated hole 10. Since the pin 7 separates from the front end of the elongated hole 10, the front arm 2 is no longer restricted by the pin 7 and becomes free by a slight angle. crusher 15, or
Hook a rope to a member in front of the front arm 2, such as the auxiliary arm 13, and use other methods to rotate the front arm 2 counterclockwise by about 10 degrees as shown in FIG.
The center line c of the hydraulic cylinder 9 should be on the left side beyond the pin 4 (left side) which is the center of rotation. Since the position of the pin 7, which is the operating point of the front part of the hydraulic cylinder 9, is on the left side beyond the line connecting the pins 4 and 8, when the hydraulic cylinder 9 is retracted as shown in FIG. rotates counterclockwise. The front arm 2 is set in advance so that when the hydraulic cylinder 9 is fully contracted, the front arm 2 rotates 180 degrees from the initial position with respect to the center line b and becomes parallel to the side of the rear arm 3, as shown in FIG. Therefore, if the boom cylinder 18 is operated in this state to lower the entire attachment until it touches the ground, the entire attachment will be in a contracted state.

When returning the front arm 2 from the folded state to the extended working state, the operation opposite to the above is performed. That is, the hydraulic cylinder 9 is extended, and when its center line c comes over the pin 4, the hydraulic cylinder 9 is slightly contracted so that the pin 7 comes near the center of the elongated hole 10. Then, similarly to the above, a rope is hung in front of the front arm 2, and the front arm 2 is rotated slightly clockwise by some other method. Next, when the hydraulic cylinder 9 is contracted, the pin 7 of the hydraulic cylinder 9 comes to the rear end of the elongated hole 10, and the front arm 2 is rotated clockwise about the pin 4. Once both arms 2 and 3 are aligned, by inserting the pin 4 on the right side, both arms 2 and 3 are connected together, and arm 1 can function as a single arm.

As described above, the present invention divides the arm of a construction machine with a long boom and arm into a front arm and a rear arm, connects them with two vertical pins, and removes one pin as necessary. In addition to making it possible to rotate the front arm laterally, a hydraulic cylinder is attached to the brackets protruding from the top of both arms, and the bracket of the front arm of the hydraulic cylinder is connected to the bracket of the front arm. Since the pin hole at the connection point is a long hole facing toward the center of rotation, the arm can be bent freely, reducing its overall length when moving after work or storing in the equipment storage area. Since the space occupied by the attachment is reduced, it is easy to move and store it, and the trouble of disassembling and reassembling the attachment can be saved, which is very effective.

[Brief explanation of the drawing]

Fig. 1 is a front view of the conventional device, Fig. 2 is a view seen from A in Fig. 1, Fig. 3 is a front view showing the storage state in the case of Fig. 1, and Fig. 4 is a front view of the conventional one. A front view of the embodiment, FIG. 5 is a view seen from B in FIG. 4, FIG. 6 is a front view showing the storage state of FIG. 4, and FIG. 7 is a view seen from C in FIG. 6. , FIGS. 8 to 12 are explanatory diagrams showing the operating conditions of the present invention. 1... Arm, 2... Front arm, 3... Rear arm, 4... Pin, 5... Bracket, 6...
Bracket, 7...pin, 8...pin, 9...hydraulic cylinder.

Claims (1)

[Scope of utility model registration request] The arm of a construction machine with a long boom and arm is divided into a front arm and a rear arm, and the rear part of the front arm and the front part of the rear arm are connected with two pins, and one of the two pins is At least one is removably provided, and a bracket is provided protruding from the upper part of the front arm and the rear arm, respectively, and between the two brackets, two hydraulic cylinder axes in the longitudinal direction connect the front arm and the rear arm. An arm bending device for a construction work machine, in which a hydraulic cylinder is mounted so as to be located between the pins of the hydraulic cylinder, and the pin insertion hole at the connection point with the bracket of the front arm of the hydraulic cylinder is configured as a long hole. .