JPH0674650U - Power shovel - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a power shovel with excellent stability that enables efficient work while maintaining balance. A lower body 10 having a swivel base 14 that swivels around a rotation axis that is perpendicular to a traveling surface on a traveling device 12, and a swivel base 14 that has an attachment such as a bucket at its tip. The excavation work device 16 having an arm attached thereto is extendable and retractable, and the guide rail 36 provided on the swivel base 14 guides the work device 12 and the excavation work device 16 and the like so as to advance and retreat in a direction parallel to the traveling surface. It is characterized by comprising an upper machine body 30 having a cockpit 32 for steering, and a hydraulic cylinder device 50 for moving the upper machine body 30 forward and backward in a direction parallel to a traveling surface.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a power shovel, and more particularly to a power shovel having excellent stability.

[0002]

[Prior art]

 In recent years, power shovels have come to be used even in narrow work sites due to the demand for labor saving, and as a result, ultra-small power shovels with ultra-small turning machines have come in handy. In this ultra-small turning machine specification, the size of the upper fuselage is limited for that purpose, and the size is kept within the vehicle width even when turning.

By the way, in a standard power shovel, a weight or the like can be provided at an appropriate distance rearward from the center of the turning shaft so as to be compatible with the excavation work device provided at the front, and the stability thereof can be improved. It was possible to secure sufficient sex.

[0004]

[Problems to be solved by the device]

 However, in a small power shovel, the machine body is small and weights and the like cannot be arranged appropriately.Therefore, when performing work away from the machine by extending the excavation work equipment, When working under a heavy load, the center of gravity of the aircraft may move forward and become unstable. In particular, in the case of the ultra-small power shovel, the weight capacity cannot be sufficiently secured due to the above-mentioned dimensional restrictions, and the center of gravity position cannot be set appropriately, so that the stability during work is further reduced. there were. Even in a standard power shovel, stability may be a problem depending on the usage conditions such as the length of the excavation work equipment. In this way, under unstable work conditions where the power shovel loses its balance, it is necessary to take measures such as slowing the work speed as compared with normal work, which may reduce work efficiency.

Therefore, an object of the present invention is to extend the excavation work device in a power shovel to perform work away from the machine body, or to perform work that puts a large load on the excavation work device. , To provide a power shovel that can work efficiently while maintaining balance.

[0006]

[Means for Solving the Problems]

 The present invention has the following configurations in order to achieve the above object. A first structure of the present invention is provided on a traveling device, a lower body provided with a revolving base which revolves around a rotation axis perpendicular to a traveling surface, and a revolving base of the lower body. An excavating work device having an arm with an attachment such as a bucket attached to the tip end that is extendable and retractable, and a guide rail provided on the swivel base that guides the arm so that it can move back and forth in a direction parallel to the traveling surface. An upper body having a cockpit and a weight for operating an excavation work device and the like, and a hydraulic cylinder device for moving the upper body forward and backward in a direction parallel to a traveling surface are provided.

According to a second configuration of the present invention, in the power shovel having the first configuration, the excavation work device provided on the swivel base of the lower machine body is replaced with the excavation work device provided on the upper machine body, It is characterized by a cylinder device that enables the upper body and excavation work device to move back and forth in a direction parallel to the running surface.

[0008]

[Action]

 According to the power shovel of the present invention, when the upper body is moved in the horizontal direction with respect to the lower body to move the center of gravity of the body, the arm is extended to perform work at a place away from the body. Alternatively, when performing work that involves a large load on the excavation work equipment, such as when the balance of the machine is lost, the balance can be easily maintained, the stability of the power shovel is improved, and work is performed efficiently. It can be carried out.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a side view of the power shovel, and FIG. 2 is an explanatory view of the power shovel as seen from the rear. A lower body 10 is composed of a traveling device 12, a swivel base 14, and the like. The traveling device 12 can drive the crawler to drive the power shovel. On a support member 13 of the traveling device 12, a swivel base 14 is mounted at the center of the traveling device 12 so as to be rotatable about a rotation axis perpendicular to the traveling surface. The swivel base 14 is provided by a swivel bearing 15 so that it can smoothly swivel. A well-known mechanism can be adopted for the turning drive unit of the turning base 14, and therefore a detailed description thereof will be omitted.

Reference numeral 16 denotes an excavation work device, which includes a boom 18, an arm 20, and a bucket 22. The boom 18 is swingably supported around a horizontal shaft 19 provided on the swivel base 14, and is driven by a cylinder device 23. The arm 20 is rotatably supported by the tip of the boom and is driven by the cylinder device 17. The bucket 22 is pivotally supported on the tip of the arm and is driven by the cylinder device 24. In this way, the excavation work device 16 is provided on the swivel base 14 so as to be extendable and contractible. Reference numeral 30 denotes an upper body, which includes an operating frame 32 for operating the traveling device 12, the excavation work device 16, etc., a weight 34, a power unit, etc. mounted on the upper frame 40.

Reference numeral 36 denotes a guide rail, which extends in the front-rear direction of the power shovel as shown in FIGS. 1 and 2, and is provided on both left and right sides of the swivel base 14. As shown in FIGS. 2 and 3, reference numerals 38 and 38 denote connecting portions, which are formed in a U-shaped section below the upper frame 40 so as to wrap the guide rails 36 and 36 in three directions. The connecting portion 38 allows the upper frame 40 to slide along the guide rail 36 with the sliding member 42 interposed. Further, the upper frame 40 is connected while being supported by the guide rail 36. As a result, the upper body 30 is coupled and supported along the guide rail 36 so as to be movable back and forth in a direction parallel to the traveling surface, and is also rotatable together with the swivel base 14. The sliding member 42 is made of nylon resin or the like and is fixed to the connecting portion 38 side, but may be fixed to the guide rail 36 side.

Reference numeral 50 denotes a hydraulic cylinder fixed to the swivel base 14, and a rod 52 extends to the rear of the power shovel body. The rod 52 is connected to the protrusion 41 formed on the upper frame 40. Therefore, when the rod 52 is expanded and contracted by the hydraulic cylinder, the upper frame 40 moves horizontally and the upper body 30 can move along the guide rail 36. As described above, by using the hydraulic cylinder 50 as the advancing / retreating device of the upper body 30, the upper body 30 can be easily moved.

Next, the operation will be described. The present embodiment has the above-mentioned configuration, and normally the rod 52 is contracted and the upper body 30 is located at the center of the traveling device 12. This state is suitable for a narrow work site. That is, since the turning radius of the upper body 30 is small when the rod 52 is contracted, it is easy to turn and the working efficiency is good. Also, when traveling with the excavation work device in a contracted state, the center of gravity is at the center, so stable traveling is possible.

Then, when the excavation work device 16 is extended to perform a work away from the machine body, or when the excavation bucket is subjected to a large load, in a work in which the machine body is out of balance, By extending the rod 52 to the desired position with the hydraulic cylinder 50 and retracting the upper body 30 to the position shown by the broken line in FIG. 1, the stability of the power shovel can be secured and work can be performed safely. You can Further, even if the power shovel was unstable, the work that was being advanced slowly can be efficiently performed by moving the upper body 30 back and forth to make adjustments. Similarly, a work site with poor footing can also be suitably handled by moving the upper body 30 back and forth.

The power shovel in which the excavation work device 16 is pivotally supported on the swivel base 14 has been described above. The excavation work device 16 is pivotally supported on the upper frame 40 so that the upper body is Even if it is moved back and forth together with 30, the balance with respect to the center of the excavation work device 16 can be adjusted according to the expansion and contraction of the excavation work device 16. Further, in this embodiment, the hydraulic cylinder 50 is used as the advancing / retreating device, but the upper body 30 is movably provided along the guide rail by the rack and the pinion (not shown), and the pinion is rotated by the hydraulic motor or the like. It can also be configured to allow.

Although the power shovel has been described in detail in the above embodiments, the present invention also relates to a self-propelled construction work machine or the like having an excavation work device and a turning device provided to lift a heavy object. Is of course available. Although various preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and it is needless to say that many more modifications can be made without departing from the spirit of the invention. That is.

[0017]

[Effect of device]

 According to the power shovel of the present invention, when the excavation work device is extended to move the upper machine body back and forth to perform work at a place away from the machine body, or when the excavation work device is subjected to a heavy load. It is possible to ensure stability even when carrying out work such as when carrying out work that causes the balance of the machine body to be lost. As a result, the power shovel can be used for different work conditions, and work efficiency and work safety can be improved.

[Brief description of drawings]

FIG. 1 is a side view of a power shovel showing an embodiment of the present invention.

FIG. 2 is an explanatory view seen from the rear of the power shovel shown in FIG.

3 is an enlarged view around the guide rail shown in FIG. 2. FIG.

[Explanation of symbols]

 10 Lower Aircraft 12 Traveling Device 14 Revolving Platform 16 Excavation Working Device 30 Upper Airframe 32 Pilot Seat 34 Weight 36 Guide Rail 50 Hydraulic Cylinder

Claims (2)

[Scope of utility model registration request] 1. A lower machine body provided with a revolving base on a traveling device for revolving around a rotation axis perpendicular to a traveling surface, and a lower body provided on the revolving base of the lower machine body and having a bucket or the like at a tip thereof. The excavation work device in which the arm to which the attachment of is attached is extendable and retractable, and the traveling device is guided by the guide rails provided on the swivel base in a direction parallel to the traveling surface, and the traveling device,
A power excavator comprising: an upper body having a cockpit for operating an excavation work device and the like, and a weight; and a hydraulic cylinder device for moving the upper body forward and backward in a direction parallel to a traveling surface. 2. The power shovel according to claim 1, wherein an excavation work device is provided on the upper body instead of the excavation work device provided on the swivel base of the lower body, and the upper body and the excavation work device are provided by a hydraulic cylinder device. A power excavator characterized in that it can move back and forth in a direction parallel to the running surface.