JP3281491B2 - Rotary fork device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a fork device which is mounted on the tip of a work attachment of a construction machine such as a hydraulic shovel or a work vehicle, and which is configured such that one claw and the other claw are grasped and opened by a fork cylinder. .

[0002]

2. Description of the Related Art FIG. 6 is a plan view of a gripping fork device disclosed in Japanese Utility Model Laid-Open No. 1-62285. In this gripping fork device, a sliding body 3 that slides substantially along an operating direction of a hydraulic cylinder 2 provided on an upper part of an intermediate boom 1 is provided, and a distal end of a piston rod of the hydraulic cylinder 2 is provided behind the sliding body 3. With a connectable connecting part,
Bases of a pair of left and right gripping arms 5, 5 that open and close in the lateral direction are pivotally attached to the top end of the upper surface of the base 4, and an intermediate link 6 between the middle part of each gripping arm 5 and the sliding body 3. , 6.

[0003]

In the operation of disassembling the scrap engine and collecting the aluminum component of the engine, the scrap engine is gripped by a grapple gripper or the like, and the engine in the gripped state is inserted into a heating furnace. Since the melting point of aluminum is lower than that of steel, the aluminum component melts first and accumulates in the oil pan attached to the engine. The aluminum component is taken out of the oil pan and collected, but the grappling tool and the like cannot be rotated about the axis thereof, so that the work efficiency is poor. An object of the present invention is to provide a rotary fork device that can solve the above problems.

[0004]

According to the present invention, a frame is provided at the tip of a work attachment of a construction machine, and a sliding body is provided on the frame by sliding the fork cylinder in the operating direction by expanding and contracting the fork cylinder. In a fork device in which the sliding body is connected to the one claw and the other claw via a link, and the fork cylinder is operated to grip the one claw and the other claw to open and close, an upper base frame body is provided at the tip of the work attachment. And a frame body integrally formed with a lower bearing body, a front bracket of the upper base frame body is pin-coupled to an arm tip, and a rear bracket is connected to a boom tip abdominal surface via a hydraulic cylinder, Also, a hydraulic motor is provided at the rear of the lower bearing, and an external joint of a swivel joint is provided at the front, concentric with the bearing hole of the lower bearing. The main shaft is inserted into the lower bearing body, the rear end of the main shaft is connected to the drive shaft of the hydraulic motor, the inner joint is connected to the front end of the main shaft, and the fork is connected to the front end of the inner joint. A long cylindrical body having a built-in cylinder is connected, a frame body is fixed to the end of the long cylindrical body, and a sliding body slidable in the operating direction of the fork cylinder is provided on the frame body, and the sliding body is provided. And a rod end of a fork cylinder are connected via a rod member, and a hydraulic oil supply / discharge pipe of the fork cylinder is connected to an oil passage of a swivel joint.

[0005]

According to the present invention, a pressure oil supply / discharge line for operating a fork cylinder built in a long cylindrical body is provided by a directional switching valve for a fork cylinder, a boom and an arm of a work attachment from a hydraulic pressure source for a main pressure oil. And is connected to a fork cylinder via a swivel joint. When the fork cylinder is extended or contracted, the rod member and the sliding body connected to the rod end of the fork cylinder move, so that the base end of the link moves along the guide elongated hole, and the one claw and the other claw are moved. Perform an opening operation or a closing operation with respect to each other. Next, when rotating the frame body to which the one claw and the other claw are attached around the longitudinal axis of the long cylindrical body, the hydraulic motor attached to the rear part of the lower bearing body of the frame body is rotated. The driving force of the hydraulic motor is applied from the drive shaft of the hydraulic motor to the main shaft inserted into the internal bearing of the lower bearing body, the internal joint, the long cylindrical body containing the fork cylinder, and the frame body, and the one claw is formed. On the other hand, the pawl can be rotated.

The height position and the front-rear position of the fork device can be adjusted by extending and retracting the boom cylinder and the arm cylinder, respectively. However, the distance between the rear bracket of the upper base frame and the abdominal surface of the boom tip can be adjusted. The fork device can be tilted up and down in the front-rear direction by expanding and contracting the hydraulic cylinder interposed in the fork device. In addition, since the frame body having one claw and the other claw is provided at the distal end of the long cylindrical body, the member to be grasped can be grasped at a position far away from the hydraulic excavator body.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an overall side view of a hydraulic shovel equipped with a fork device 7 of the present invention. In the drawing, 8 is an upper revolving superstructure which is a main body of a hydraulic excavator, 9 is a lower traveling superstructure,
10 is a work attachment attached to the front part of the upper revolving unit 8, 11 is a boom of the work attachment 10, 1
2 is an arm, 13 is a boom cylinder, 14 is an arm cylinder, 15 is a frame of the fork device 7, 16 is an upper base frame of the frame 15, and 17 is a frame 15
Lower bearing body, 18 is a front bracket of the upper base frame body 16, 19 is a rear bracket, 20 is a hydraulic cylinder,
21 is a hydraulic motor, 22 is a swivel joint, 23 is a long cylinder, 24 is a frame, 25 is a pin-shaped sliding body, 26,
26 is a pair of links, 27 is one claw, and 28 is the other claw. FIG. 2 is a left side view of the fork device 7 in FIG. In the figure, reference numeral 29 (shown by a broken line) denotes a long cylindrical body 23.
The dimension S is the amount of expansion / contraction stroke of the fork cylinder 29, and 30 is the fork cylinder 2
9 is a rod member connecting the rod tip and the sliding body 25.

FIG. 3 is a longitudinal sectional view of a main part in a portion A of FIG. In the drawing, reference numerals 31 and 32 denote front and rear bearings respectively mounted inside the lower bearing body 17, reference numeral 33 denotes an external joint of the swivel joint 22, reference numeral 34 denotes a drive shaft of the hydraulic motor 21, reference numeral 35 denotes a main shaft, and reference numeral 36 denotes a main shaft 35. , 37 is a rib for reinforcing the fixation between the inner joint 36 and the elongated cylinder 23, and 38 is a fork cylinder mounting bracket integrally fixed inside the elongated cylinder 23. is there. FIG. 4 is a sectional view taken along the line CC of FIG.
It is sectional drawing. In the figure, reference numeral 39 denotes a guide elongated hole for guiding the sliding body 25 in a substantially axial direction of the rod member 30.
FIG. 5 shows a state in which the fork device 7 in FIG.
FIG. 7 is a side view showing a state in which the gripping direction of is rotated by 90 °.

Next, the structure of the fork device 7 of the present invention will be described with reference to FIGS. In the present invention, a frame body 15 in which an upper base frame body 16 and a lower bearing body 17 are integrally formed is provided at the end of the arm 12 of the work attachment 10, and the front bracket 18 of the upper base frame body 16 is attached to the end of the arm 12. The rear bracket 19 is connected to the front part of the boom 11 via a hydraulic cylinder 20, and a hydraulic motor 21 is mounted on the rear part of the lower bearing body 17 with a pin 40 (shown in FIG. 1). The outer joint 33 of the swivel joint 22 was attached to the front part concentrically with the bearing hole center 0-0 (shown in FIG. 3) of the lower bearing body 17.
Further, a main shaft 35 is fitted over the front bearing 31 and the rear bearing 32 inside the lower bearing body 17, the rear end of the main shaft 35 is connected to the drive shaft 34 of the hydraulic motor 21, and the front end of the main shaft 35 is The internal joint 36 is connected, the fork cylinder 29 is fixed to the front end surface of the internal joint 36, the built-in long cylinder 23 is connected, and the frame 24 is fixed to the tip of the long cylinder 23. A sliding member 25 slidable in the operating direction of the fork cylinder 29 is provided on the frame 24, and the sliding member 25 and the rod tip of the fork cylinder 29 are connected via a rod member 30. The hydraulic oil supply / discharge pipes 41 and 42 are connected to an oil passage (not numbered) of the swivel joint 22.

Next, the operation of the fork device 7 of the present invention will be described. In the present invention, a supply / discharge line (not shown) for pressurized oil for operating the fork cylinder 29 incorporated in the long cylindrical body 23 is provided by a fork cylinder direction switching valve from the main pressurized oil source. It is piped along the boom 11 and the arm 12 of the attachment 10 and communicates with the fork cylinder 29 via the swivel joint 22. When the fork cylinder 29 is extended or contracted, the rod member 30 and the sliding body 25 connected to the rod tip of the fork cylinder 29 move, so that the links 26 and 2 are moved.
6 moves along the guide slot 39 (shown in FIGS. 1 and 4), and the one claw 27 and the other claw 28 open or close each other. Next, when rotating the long cylindrical body 23 around the longitudinal axis (concentric with the shaft hole 0-0 shown in FIG. 3), the hydraulic motor 21 is rotated. The driving force of the hydraulic motor 21 is controlled by the drive shaft 34 of the hydraulic motor 21.
The main shaft 35, the inner joint 36, the long cylindrical body 23,
And the claw 2 together with the frame 24
7 and the other claw 28 can be rotated.

The height position and the front-rear position of the fork device 7 can be adjusted by extending and retracting the boom cylinder 13 and the arm cylinder 14, respectively, as shown in FIG. , A hydraulic cylinder 20 interposed between the boom 11 and the tip abdominal surface
The fork device 7 can be tilted up and down in the front-rear direction by expanding and contracting. In addition, since the frame 24 having the one claw 27 and the other claw 28 is provided at the distal end of the long cylindrical body 23, the member to be grasped can be grasped at a position far away from the hydraulic excavator body.

[0012]

According to the fork device of the present invention, a frame body in which an upper base frame body and a lower bearing body are integrally formed is provided at the end of an arm of a work attachment of a hydraulic shovel, and a front bracket of the upper base frame body is provided. To the arm tip, and the rear bracket to the boom tip abdominal surface via a hydraulic cylinder, a hydraulic motor at the rear of the lower bearing, and the bearing bore of the lower bearing at the front. Attach the external joint of the swivel joint concentrically, insert the main shaft into the lower bearing body, connect the rear end of the main shaft to the drive shaft of the hydraulic motor, and connect the inner joint to the front end of the main shaft, A long cylindrical body with a built-in fork cylinder is connected to the front end face of the internal joint, a frame is fixed to the end of the long cylindrical body, and a fork cylinder is fixed to the frame. It is configured by providing a slidable slide in the actuating direction of the. Therefore, the supply / discharge conduit for operating the fork cylinder, which is piped along the boom and the arm of the work attachment from the main body side of the hydraulic shovel, can be easily communicated with the fork cylinder via the swivel joint. . When rotating the frame on which the one claw and the other claw are attached around the longitudinal axis of the long cylindrical body, the hydraulic motor attached to the rear portion of the lower bearing of the frame is rotated. The driving force of the hydraulic motor is applied from the drive shaft of the hydraulic motor to the main shaft inserted into the internal bearing of the lower bearing body, the internal joint, the long cylindrical body containing the fork cylinder, and the frame body, and the one claw is formed. On the other hand, the pawl can be rotated. That is, by providing the rotary fork device at the tip of the work attachment, the efficiency of fork work can be significantly improved. Further, in the fork device of the present invention, since a frame having one claw and the other claw is provided at the tip of a long cylindrical body having a considerably large length, for example, a scrap engine is gripped by the claw and inserted into the heating furnace. Operating the excavator at a remote location to avoid adverse effects of heat. In addition, by using the rotary fork device of the present invention, labor for collecting the aluminum component from the engine can be saved.

[Brief description of the drawings]

FIG. 1 is an overall side view of a hydraulic excavator equipped with a fork device of the present invention.

FIG. 2 is a left side view of the fork device in FIG.

FIG. 3 is a longitudinal sectional view of a main part in a part A of FIG. 2;

FIG. 4 is a cross-sectional view taken along line CC of section B in FIG. 2;

FIG. 5 is a side view showing an operation state of the fork device in FIG. 1;

FIG. 6 is a plan view of a gripping fork device according to an embodiment of the prior art.

[Explanation of symbols]

 2, 20 Hydraulic cylinder 3, 25 Sliding body 7 Fork device 10 Work attachment 15 Frame body 16 Upper base frame body 17 Lower bearing body 18, 19 Front and rear brackets 21 Hydraulic motor 22 Swivel joint 23 Long cylindrical body 24 Frame body 27, 28 On the other hand, the other claw 29 Fork cylinder 30 Rod member 33, 36 External and internal joint 35 Main shaft

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B66C 1/42 B66C 1/68

Claims (1)

(57) [Claims] 1. A frame body is provided at the tip of a work attachment of a construction machine, and a slide body is provided on the frame body, the slide body being slid along the operating direction by the expansion and contraction operation of a fork cylinder. In a fork device in which the other pawls are connected via links and the fork cylinder is operated to open and close the one pawl and the other pawl, the upper base frame body and the lower bearing body are integrally formed at the tip of the work attachment. The formed frame body is provided, the front bracket of the upper base frame body is pin-connected to the tip of the arm, and the rear bracket is connected to the boom tip abdominal surface via a hydraulic cylinder, and at the rear of the lower bearing body. Install a hydraulic motor and an external joint of a swivel joint at the front, concentric with the bearing bore of the lower bearing. A long cylindrical body having a shaft inserted therein, a rear end of the main shaft connected to the drive shaft of the hydraulic motor, an inner joint connected to a front end of the main shaft, and a fork cylinder built in a front end surface of the inner joint. And a frame body is fixed to the end of the long cylindrical body, and a slide body slidable in the operation direction of the fork cylinder is provided on the frame body. A rotary fork device, wherein a hydraulic fluid supply / discharge pipe of a fork cylinder and an oil passage of a swivel joint are connected to each other through a rod member.