JP2008143628A - Overturn prevention device of working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an overturn prevention device of a working machine capable of withstanding the heavy load through a compact and simple structure. <P>SOLUTION: The working machine 1 comprises a lower traveling body (2) where a crawler frame (5) is extended to the advancing direction and fixed to both side parts of a body (3) and an endless crawler shoe (6) is circulably mounted to the crawler frame (5), and an upper turning body (10) which turnably connects the boom (13) and a driver's cabin (12) to an upper part of the body (3). A fulcrum pin (16) is provided on the crawler frame (5) by inclining upward and outward, one end part of a rod-like auxiliary leg (17) is turnably connected to the fulcrum pin (16), and a turning device (20) which turns the auxiliary leg (17) downward orthogonal to the longitudinal direction of the crawler frame (5) and to a fore-and-aft direction along the longitudinal direction of the crawler frame (5), is provided, with the fulcrum pin (16) as a center. The auxiliary leg (17) is made to the length that the lower end approaches or abuts on the ground when being turned downward. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rollover prevention device for a work machine that prevents a work machine having a crawler for traveling from rolling over during work.

  As a conventional technique, a jack beam is protruded and fixed to the side of the crawler frame on the left and right sides of the crawler crane and in front of the center of gravity of the crawler crane main body, and is hydraulically connected to the tip of the jack beam. The jack is extended downward and the jack is extended to lift the front part of the crawler so that the lower face of the crawler is horizontal, and a wedge-shaped inclined plate is placed between the lower face of the front part of the crawler and the ground. There was one which supported a crawler crane horizontally by inserting.

In the prior art, since the tip of the jack beam and the jack always protrude outward from the crawler, the jack beam and the jack may collide with an obstacle or an operator when the crawler crane travels. Yes, it was poor in safety. In order to avoid this collision, it is necessary to remove the jack beam and the jack from the crawler frame each time the vehicle travels, but this is troublesome and labor intensive. Further, since a heavy-weight crawler crane is supported by a hydraulic jack, the jack requires an expensive jack that can withstand a high load.
JP 2005-263406 A

  An object of the present invention is to obtain a novel rollover prevention device for a work machine that has a simple structure and can withstand high loads.

The present invention is configured as follows to achieve the above object. That is, the invention according to claim 1 is a lower traveling body in which a crawler frame is extended and fixed to both sides of a body in an advancing direction, and an endless crawler shoe is attached to the crawler frame so as to be able to go around, A work machine having an upper revolving body formed by pivotally connecting a boom and a cab to the upper part of the body is provided, and a fulcrum pin is inclined upward and outward on the crawler frame, and a rod-like shape is provided on the fulcrum pin. One end of the auxiliary leg is rotatably connected, and the auxiliary leg is rotated about the fulcrum pin in a downward direction perpendicular to the longitudinal direction of the crawler frame and in a longitudinal direction along the longitudinal direction of the crawler frame. A moving device is provided, and the auxiliary leg has such a length that its lower end approaches or comes into contact with the ground when rotated downward.
According to a second aspect of the present invention, a holder whose upper surface is inclined downward toward the outer side is fixed to the crawler frame, and a fulcrum pin that protrudes upward in the orthogonal direction from the upper surface is provided on the holder.
According to a third aspect of the present invention, as the rotating device, one end of a hydraulic cylinder is connected to a crawler frame or a holder, and the other end of the hydraulic cylinder is connected to an auxiliary leg.

  In the invention according to claim 1 of the present application, when the rotation device is operated in one direction, the auxiliary leg is rotated downward about the fulcrum pin and perpendicular to the longitudinal direction of the crawler frame, and the lower end of the auxiliary leg is the crawler frame. It will be exposed to the outside and will approach or contact the ground. Thus, when the work machine is about to fall sideways, the auxiliary leg stretches against the ground and prevents the sideways falling. In this case, the auxiliary leg has a rod shape and can withstand a high compressive load. Further, when the rotating device is operated to the other side, the auxiliary leg is rotated in the longitudinal direction of the crawler frame around the fulcrum pin, and the auxiliary leg is stored in a space surrounded by the crawler shoes. Will be. Thus, the auxiliary leg does not come into contact with an obstacle or an operator when the work machine is traveling.

  In the invention according to claim 2, since the fulcrum pin is attached to the holder separate from the crawler frame, by changing the inclination angle of the upper surface of the holder or the attachment angle of the holder with respect to the crawler frame, The inclination angle can be easily changed. As a result, the auxiliary legs can be easily attached to work machines of different models.

  In the invention according to claim 3, since the auxiliary leg that requires a small load is rotated by the hydraulic cylinder, the rotating device can be reduced in size, and the rotating device is surrounded by a crawler shoe. Can be easily placed inside.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partially sectional front view of a working machine showing an embodiment of the present invention, FIG. 2 is an enlarged view of a main part of FIG. 1, and FIG. 3 is an enlarged view of a main part viewed from A of FIG.

  In FIG. 1, reference numeral 1 denotes a work machine, which includes a lower traveling body 2 and an upper swing body 10. The lower traveling body 2 fixes crawler frames 5 extending in the front-rear direction (traveling direction) via the arms 4 on both the left and right sides of the body 3. An idler wheel and a drive wheel are attached to the front and rear ends of the crawler frame 5, and an endless crawler shoe 6 is suspended between the idler wheel and the drive wheel, and the crawler frame 5 is surrounded by the crawler shoe 6.

  The upper swing body 10 is attached to the upper portion of the body 3 so that the swivel base 11 can be swung around the vertical axis, the cab 12, the boom 13, the engine, and the like are attached to the swivel base 11. Alternatively, a hook or the like that is moved up and down by a winch wire is attached so that a predetermined operation can be performed.

  As shown in FIGS. 2 and 3, an auxiliary leg 17 is rotatably attached to a middle portion in the front-rear direction of the crawler frame 5 via a holder 15 and a fulcrum pin 16. The holder 15 is elongated in the front-rear direction and is firmly fixed to the upper surface of the crawler frame 5 by welding or bolts, and the upper surface 15a has a triangular cross-section that is inclined downward toward the right (outward). In this example, the length of the holder 15 in the front-rear direction is about 2400 mm, and the inclination angle (α1) of the upper surface 15a with respect to the horizontal plane is about 43 degrees.

  The fulcrum pin 16 is fixed to the center portion of the holder 15 by projecting upward in the orthogonal direction with respect to the upper surface 15a and forming a male screw at the tip. The auxiliary leg 17 is rotatably connected to the fulcrum pin 16. The auxiliary leg 17 has a bracket 17b integrally fixed to an upper end portion of a square pipe main portion 17a, and a ground pad 17c is rotatably connected to the lower end portion via a pin 17d in the front-rear direction. The center portion of the bracket 17b is pivotally fitted to the fulcrum pin 16, and a nut 17e is screwed to the tip of the fulcrum pin 16 to prevent it from coming off.

  In this example, the auxiliary leg 17 has a length L1 from the fulcrum pin 16 to the lower end of about 823 mm, a length L2 from the fulcrum pin 16 to the upper connecting pin 20d is about 125 mm, and the main body portion 17a has a thickness T1. The square pipe material has a length of about 75 mm and a width T2 of about 150 mm. The main body portion 17a may be formed of a cylindrical pipe material.

  Reference numeral 20 denotes a turning device for turning the auxiliary leg 17. As shown in FIG. 3, the rotating device 20 is disposed on the upper portion of the holder 15 in the front-rear direction (left and right in FIG. 3), and the rear end of the cylinder case 20a is connected to the holder 15 by a lower connecting pin 20c. The head of the rod 20b is pivotally connected to the front side, and is pivotally connected to the upper end of the bracket 17b by the upper connecting pin 20d.

  When the rotation device 20, that is, the hydraulic cylinder is extended, the auxiliary leg 17 rotates downward about the fulcrum pin 16 as shown in FIGS. 2 and 3, and the ground pad 17 c at the lower end is placed on the ground G. When approaching or abutting and the hydraulic cylinder is shortened, the hydraulic cylinder is rotated backward about the fulcrum pin 16 as shown by the phantom line in FIG.

  As described above, according to the present invention, only by rotating the auxiliary leg 17 around the fulcrum pin 16, the lower end portion of the auxiliary leg 17 is caused to appear and disappear from the space surrounded by the crawler shoe 6. When the grounding pad 17c at the lower end is exposed to the outside from the space by rotating it in one direction, the grounding pad 17c stretches the ground G to prevent the work machine 1 from overturning, and the auxiliary pad If the leg 17 is rotated in the other direction and stored in the space surrounded by the crawler shoe 6, the work machine 1 can travel safely. Therefore, the present invention is small and simple in structure, and the auxiliary leg 17 is always attached to the crawler frame 5, so that the auxiliary leg 17 is not required to be attached / detached and stored. The auxiliary legs 17 may be provided on the left and right crawler frames 5, respectively, or a plurality of auxiliary legs 17 may be provided on one crawler frame 5 at intervals in the front-rear direction.

It is a partial cross section front view of the working machine which shows the Example of this invention. It is a principal part enlarged view of FIG. It is the principal part enlarged view seen from A of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Work machine 2 Lower traveling body 3 Body 4 Arm 5 Crawler frame 6 Crawler shoe 10 Upper revolving body 11 Swivel stand 12 Driver's cab 13 Boom 15 Holder 15a Upper surface 16 Supporting pin 17 Auxiliary leg 17a Main part 17b Bracket 17c Grounding pad 17d Rotation Pin 17e Nut 20 Rotating device 20a Cylinder case 20b Rod 20c Lower connecting pin 20d Upper connecting pin G Ground

Claims (3)

  A crawler frame (5) is extended and fixed on both sides of the body (3) in the traveling direction, and an endless crawler shoe (6) is attached to the crawler frame (5) so as to be able to go around ( 2) and an upper revolving body (10) having a boom (13) and a driver's cab (12) pivotably connected to the upper part of the body (3), the crawler frame The fulcrum pin (16) is inclined upward and outward in (5), and one end of a rod-shaped auxiliary leg (17) is rotatably connected to the fulcrum pin (16). ) About a fulcrum pin (16), and a rotating device (20) that rotates downwardly perpendicular to the longitudinal direction of the crawler frame (5) and forward and backward along the longitudinal direction of the crawler frame (5). The auxiliary leg (17 , When is rotated in the downward rollover prevention apparatus for a working machine to which the lower end is characterized in that a length close to or in contact with the ground.   A holder (15) whose upper surface is inclined downward toward the outer side is fixed to the crawler frame (5), and a fulcrum pin (16) projecting upward in the orthogonal direction from the upper surface is provided on the holder (15). The rollover prevention device for a work machine according to claim 1, characterized in that:   The rotating device (20) is characterized in that one end of a hydraulic cylinder is connected to a crawler frame (5) or a holder (15), and the other end of the hydraulic cylinder is connected to an auxiliary leg (17). Item 3. A work machine rollover prevention device according to Item 1 or 2.

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