WO2002070827A1

WO2002070827A1 - Lifting/lowering step structure for construction machines

Info

Publication number: WO2002070827A1
Application number: PCT/JP2002/000206
Authority: WO
Inventors: Kazumichi Iwasa; Masanori Tsuji; Akihiro Yoshida; Tomoya Terakawa
Original assignee: Shin Caterpillar Mitsubishi Ltd.
Priority date: 2001-03-01
Filing date: 2002-01-15
Publication date: 2002-09-12
Also published as: JP2002256593A

Abstract

It is arranged that lifting/lowering movement between the upper surface of a storage box and the upper surface of a fuel tank is easily effected without involving an increase in cost or impairing the visual field of the operator in the cab. A lifting/lowering step (12) is attached to the side surface of the fuel tank (8) on the side adjacent the storage box (7).

Description

Description Step structure for elevating construction machinery

The present invention belongs to the technical field of an elevating step structure provided for an operator to ascend and descend on the upper surface of a machine body during maintenance or the like in a construction machine such as a hydraulic shovel. Background art

In general, when working on construction equipment such as hydraulic excavators, etc., perform inspections and repairs of engines and pumps, maintenance such as filter replacement, and refueling, etc. Some are configured to perform In such a case, it is necessary to provide steps, stairs, and the like for the worker to ascend and descend to the upper surface of the fuselage. Therefore, for example, in the case of a hydraulic shovel, as shown in FIG. It is known that the storage box (storage box) 7 is configured to rise from an upper surface 7a of the storage box 7 to an upper surface 8b of a tank 8 such as a fuel tank arranged adjacent to the storage box 7. From the ground, the upper surface 7a of the storage box 7 can be accessed from the ground by, for example, the step 16 attached to the lower traveling structure 2, the upper surface of the crawler 2a, the step 17 attached to the swing frame 5, and the like. You can do it. In FIG. 6, reference numeral 6 denotes a cap provided on the left front half of the fuselage. Between the cap 6 and the storage box 7, the base end of the boom 4a is swingable. Supported.

By the way, in the above-mentioned case, if the height difference from the upper surface 7a of the storage box to the upper surface 8b of the tank is large, it is difficult to ascend and descend. Therefore, conventionally, as shown in FIG. 7, a stepped upper surface of the storage box 7 has been provided. This force causes the storage pox 7 to have a complicated shape, which causes a cost increase. In this case, if the length A of the front and rear of the storage box 7 is short, the height dimension H of one step of the stairs may be changed according to, for example, an earthworking machine by the International Organization for Standardization (ISO). If the height is set to 250 mm or less, which is specified as the height of the stairs of the access system, the stepping distance (toe clearance) L may not be equal to or greater than the 240 mm specified in ISO above. In this case, the stairs are difficult to ascend and descend. Further, the storage box arranged at the right front end of the fuselage is located on the opposite side of the cap arranged at the left front half of the fuselage with the boom support portion interposed therebetween. In the storage box, there is a concern that the operator in the cabin may lose visibility to the right of the fuselage, and there is a problem that Honki Akira tried to solve. Disclosure of the invention

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has been created with the object of solving these problems, and has an upper surface of a storage box that can be accessed from the ground side, and an area adjacent to the storage box. Steps for ascending and descending from the top of the tall tank to be placed are attached to the side of the tank adjacent to the storage box.

By doing so, it is easy to ascend and descend between the upper surface of the storage box and the upper surface of the tank, and it is possible to avoid an increase in cost and a loss of visibility of the operator.

In this case, there is an advantage that the stress acting on the side surface of the tank can be reduced and the strength of the tank can be increased by attaching the step via a reinforcing plate fixed to the side surface of the tank.

The tank to which the steps are attached includes, for example, a fuel tank and a hydraulic oil tank. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a side view of a hydraulic excavator according to the present embodiment.

FIG. 2 is a side view of a lifting step mounting portion.

FIG. 3 is a plan view of an elevating step mounting portion.

FIG. 4 is a front view of a lifting step attaching portion.

FIG. 5 is a perspective view of a lifting / lowering step mounting portion in which a cosmetic power par is omitted. FIG. 6 is a side view of a hydraulic excavator showing a conventional example.

FIG. 7 is a side view of a storage pox showing a conventional example. BEST MODE FOR CARRYING OUT THE INVENTION

Next, embodiments of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a hydraulic excavator, and the hydraulic excavator 1 includes a crawler-type lower traveling body 2, an upper revolving body 3 that is rotatably supported by the lower traveling body 2, and attached to the upper revolving body 3. It consists of various parts such as front attachment 4.

A swing frame 5 serving as a frame of the upper swing body 3 has a boom 4 a constituting a front attachment 4 supported at the center front thereof so as to be vertically swingable. On the right side of the boom support 5a, a storage box 7, a fuel tank 8, and a hydraulic oil tank 9 are arranged in this order from the front. Further, an engine room 10 in which member devices (not shown) such as an engine, a pump unit, a battery, a radiator and the like are accommodated is arranged in a rear half portion of the swing frame 5. The upper surface of the hydraulic oil tank 9 and the upper surface of the fuel tank 8 form a substantially horizontal body upper surface 11. Then, the worker can perform operations such as inspection and repair of the above-mentioned member devices, replacement of filters, refueling, and the like while being placed on the upper surface 11 of the machine body.

The storage box 7 is for storing therein a plastic can, a tool, a cold protection tool and the like, and the bottom of the storage box 7 is formed by a swing frame 5. Further, the upper surface 7a of the storage box 7 is formed in a substantially horizontal shape and can be opened and closed. However, the height of the upper surface 7a is limited to the operator's right view of the cabinet 6 in the right direction of the airframe. Is set to a lower height so that it is not damaged.

On the other hand, the front part (the surface part adjacent to the storage pox 7) 8a of the fuel tank 8 is located on the way from the upper surface 7a of the storage box 7 to the upper surface 8b of the fuel tank 8, so that the worker goes up and down. Elevating steps 1 and 2 are installed. In this case, a reinforcing plate 13 is welded to the step mounting portion of the fuel tank 8. An elevating step 12 is detachably attached to the reinforcing plate 13 via a screw 14. In the present embodiment, the height dimension Hl from the storage box upper surface 7a to the elevating step 12 and the height dimension H2 from the elevating step 12 to the fuel tank upper surface 8b are 2 3 O mn! Conforms to the height of the step of the access system of earthmoving machinery specified by the Organization for Standardization (ISO). It is set in the range of ~ 40 O mm. Furthermore, the stepping distance (toe clearance) dimension L1 of the step 12 for elevating is set to 13 O mm or more so as to conform to the stepping dimension of the step specified in ISO. Further, in the present embodiment, the stepping distance L2 on the upper surface 7a of the storage box is sufficiently ensured, but since the toe can be put in the space below the elevating step 12, substantial stepping distance can be obtained. L3 is larger than the above-mentioned stepping distance L2, so that even if the front-rear length A of the storage box 7 is short, the stepping-up required for elevating the storage box upper surface 7a is required. The dimensions can be secured. Incidentally, reference numeral 15 denotes a cosmetic power member attached to the front surface 8a of the fuel tank 8, and the elevating step 12 protrudes forward from an opening 15a formed in the decorative cover 15. I have.

Also, 16 is a step to be attached to the frame of the lower traveling structure 2, and 17 is a step to be attached to the front end of the swing frame 5. By ascending the upper surface of a, the upper surface 7a of the storage box 7 can be accessed from the ground. Further, reference numeral 18 denotes a handrail to be gripped when the worker goes up and down on the upper surface 11 of the machine.

In the structure constructed as described above, when ascending and descending to the upper surface 11 of the aircraft to perform maintenance such as inspection and repair of members and devices, filter replacement, refueling, etc., the upper surface 7a of the storage box and the fuel tank The upper surface 8b can be raised and lowered using the lifting step 12 attached to the front surface 8a of the fuel tank 8, but in this case, for example, stairs are specified as an access system for earthmoving machinery in ISO. Although it is difficult to adapt to the required dimensions, it is easy to set the dimensions that conform to the above IS〇 because of the elevating step 12. Therefore, it is possible to provide an ascending and descending access system. Plus, the top of the storage box As in the case where the storage box is stepped, the shape of the storage box is not complicated and contributes to an increase in cost, or does not hinder the operator's right view of the cap 7 in the right direction.

Moreover, in this case, the lifting step 12 is attached to the front surface 8a of the fuel tank 8 via the reinforcing plate 13 so that the worker's load is applied to the lifting step 12. Sometimes the stress acting on the front part 8a of the fuel tank can be reduced, but there is also the advantage that the strength of the front part 8a of the fuel tank 8a can be measured by the reinforcing plate 13 and the step 12 for raising and lowering. .

In addition, since the elevating step 12 is detachably attached to the reinforcing plate 13, the elevating step 12 is installed and removed, for example, when the pivot of the boom 4 a is attached to and removed from the boom support 5 a. If you remove steps 1 and 2, the work will be difficult and convenient.

In this embodiment, only one elevating step 12 is mounted on the front surface 8a of the fuel tank 8, but the height difference between the upper surface 7a of the storage box and the upper surface 8b of the fuel tank is small. If it is large, it goes without saying that a plurality of elevating steps 12 may be provided.

Also, the tank to which the step is attached is not limited to the fuel tank.For example, when the hydraulic oil tank is arranged adjacent to the storage box, the step is performed on the side of the hydraulic oil tank adjacent to the storage pox. It will be attached to. Industrial applicability

In the present invention, a step for ascending and descending between the upper surface of the storage box and the upper surface of the tank is attached to the side surface of the tank adjacent to the storage pox. As a result, during maintenance or the like, it is easy to move up and down between the upper surface of the storage box and the upper surface of the tank, and there is an advantage that the visibility of the operator is not impaired and the cost is low.

Claims

Scope of demand

1. Steps to ascend and descend between the upper surface of the storage pox accessible from the ground side and the upper surface of the tall tank located adjacent to the storage bottas, Elevating step structure for construction machinery, which is attached to the side of the building.

2. The step-up / down structure for a construction machine according to claim 1, wherein the step is mounted via a reinforcing plate fixed to a side surface of the tank.

3. The step-up / down structure for a construction machine according to claim 1, wherein the tank is a fuel tank or a hydraulic oil tank.