JP2002220854A - Driver's cab lifting device of construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a driver's cab lifting device of a construction machine capable of obliquely and stably moving a driver's cab of the construction machine between a fixed position and an upper position in front of it and fixing the driver's cab to an arbitrary slide position securely. SOLUTION: This driver's cab lifting device of the construction machine is provided with a mounting base 18 attached to the driver's cab 12, a support base 20 provided in a machine body of the construction machine to support the mounting base 18 between the 'fixed position' and the 'front upper position' slidably, a drive means provided between the mounting base 18 and the support base 20 to move the mounting base 18 slidably, and a fixing means fixing the mounting base 18 to the support base 20 at the arbitrary slide position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for raising and lowering a cab of a construction machine, and more particularly, to a device for stably moving a cab of a construction machine up and down to a position where a good view can be secured with respect to the body. The present invention relates to a lift device for a driver's cab, which can be fixed to an arbitrary lift position.

[0002]

2. Description of the Related Art A typical construction machine, for example, a hydraulic excavator, has its cab fixed and mounted in a predetermined position on the fuselage in a standard form. However, when using a hydraulic excavator to perform operations such as excavating a shaft, dismantling a car, etc., it is necessary to improve the visibility from the driver's cab and to sufficiently confirm the target of the operation. The driver's cab shall be mounted on the fuselage by at least the following method so that it can be moved in advance at the time of pit excavation or upward at the time of car disassembly or if necessary. Have been.

(1) Installation at a high position: An operator's cab raising table called a carburetor is provided between the machine in which the operator's cab is installed and the operator's cab, and the operator's cab is lifted and installed accordingly.

(2) Forward horizontal movement: As a method of mounting the cab movably forward, for example, Japanese Patent Application Laid-Open No. H10-159
There is a technique disclosed in Japanese Patent No. 132. In this method, a driver's cab is mounted so as to be slidable forward in a horizontal direction with respect to an airframe.

(3) Moving diagonally forward and upward: As a method of mounting the cab movably forward and upward, see, for example, JP-A-200
There is a technique disclosed in Japanese Patent Application Publication No. 0-212556.
In this method, a four-node parallel link is installed between the fuselage and the operator's cab, and the operator's cab is moved obliquely upward and forward by the link mechanism and the hydraulic cylinder.

[0006]

However, the conventional cab of a construction machine of the above-described type has the following problems to be solved.

(1) Carburizer: In the carburetor system, the line of sight from the cab is high, but the position of the cab is fixed, so that it cannot be changed any more. Therefore, it is suitable for a specific task, but it is difficult to cope with various different tasks.

(2) Forward horizontal sliding movement: The forward horizontal sliding method of the driver's cab cannot move in the vertical direction, so that it is difficult to efficiently perform work such as dismantling a car when looking down from a high place. .

(3) Forward and obliquely upward link movement: The forward and obliquely upward link movement method of the driver's cab requires high precision in the rotation center shaft portion of the link mechanism and the dimension between the links. Is easy to rattle. In addition, since the position is held by the link and the hydraulic pressure, it is difficult to stably fix the cab against vibration, impact, and the like of the body. Furthermore, because of the parallel link system, the amount of elevation of the cab is limited by the length of the link, and the elevation position is also limited to an arcuate position.

The present invention has been made in view of the above-mentioned circumstances, and a technical problem thereof is that a driver's cab can be stably moved obliquely between a fixed position and an upper position in front of the driver's cab, and An object of the present invention is to provide an operator's cab elevating device of a construction machine, which can reliably fix an operator's cab at an arbitrary sliding position.

[0011]

According to the first aspect of the present invention, there is provided a mounting base on which an operator's cab is mounted, and a mounting base mounted on the body of a construction machine, and the mounting base is located at a "fixed position" and an upper position in front thereof. And a driving means interposed between the mounting table and the supporting table to slide and move the mounting table, and an arbitrary slide of the mounting table. And a fixing means for fixing to a support base at a position.

The cab is slidable between the "fixed position" and the "upper front position" by the mounting base and the support base,
The cab can be fixed at an arbitrary sliding position by the fixing means.

According to a second aspect of the present invention, in the construction machine operator's cab elevating device according to the first aspect, a pair of sliding members is provided between the mounting table and the support table in the sliding direction of the mounting table. A sliding mechanism, wherein each of the sliding mechanisms extends in the sliding direction, and an upper slide member provided on the mounting base, a lower slide member provided on the support base and slidably supporting the upper slide member. And a slide guide member that is attached to a support that guides the slide between the upper slide member and the lower slide member.

The cab can be stably slidably moved and fixed by sliding mechanisms provided on the left and right sides in the sliding direction between the mounting table and the support table.

According to a third aspect of the present invention, in the cab lift device for a construction machine according to the first or second aspect, the driving means includes a telescopic hydraulic cylinder.

The operator's cab can be easily and freely moved to an arbitrary position by expansion and contraction of the hydraulic cylinder.

According to a fourth aspect of the present invention, in the cab lift device for a construction machine according to the second or third aspect, one end of the slide guide member in the sliding direction is swingably attached to a support table. The fixing means is interposed between the slide guide member and the support base, swings the slide guide member, and releasably presses the upper slide member toward the lower slide member so as to be releasable. It is provided with.

The operator's cab can be easily and freely fixed to an arbitrary position by expansion and contraction of the fluid pressure cylinder.

According to a fifth aspect of the present invention, in the cab lift device for a construction machine according to any one of the first to fourth aspects, the mounting base is moved from the "fixed position" to the "front upper position".
At the position moved to the side, the front end portion projects forward from the front end portion of the support base.

Further, the field of view from the driver's cab can be sufficiently secured without being obstructed by the support table.

[0021]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a construction machine cab lifting device for a construction machine according to the present invention. This will be described in detail.

Referring to FIG.
The hydraulic excavator shown by the symbol
And an upper revolving unit 6 supported on the upper side so as to be rotatable in the horizontal direction. The upper revolving unit 6 includes a driver's cab 12 attached to a revolving unit frame 10 via a driver's cab elevating device 8, a working machine 14 arranged in front of the driver's cab 12 (left side in FIG. 1), and a driver's cab. An engine room 16 is provided behind (to the right in FIG. 1).

The work machine 14 includes a boom 14a supported on the revolving frame 10 so as to be vertically swingable, a boom operating cylinder 14b interposed between the upper revolving frame 10 and the boom 14a, and a tip of the boom 14a. 14c, which is swingably supported in the vertical direction, and an arm operating cylinder 14 interposed between the boom 14a and the arm 14c.
d, a bucket 14e supported at the tip of the arm 14c so as to be vertically swingable, and the arm 14c and the bucket 14
e provided with a bucket working cylinder 14f interposed between the bucket working cylinder 14e and the bucket operating cylinder 14e. When dismantling an automobile or the like by the hydraulic excavator 2, the bucket 14e is replaced with a known crusher, and when performing deep hole excavation work such as excavation of a shaft, the bucket 14e and the arm 14c are replaced with a known clamshell bucket and a telescoping work. The work is performed by replacing the arm.

The driver's cab 12 mounted via the driver's cab lifting device 8 is a "fixed position" shown in FIG. 1 and a front upper position shown in FIG. It slides obliquely freely between the front upper position and the upper and lower positions.

The cab lift 8 will be described with reference to FIGS. 3 to 5, mainly FIG. The cab lift 8
A mounting table 18 to which the operator's cab 12 is mounted; a support table 20 which is mounted on the revolving frame 10 which is an airframe and slidably supports the mounting table 18 between the above-mentioned "fixed position" and "front upper position". A driving means 22 interposed between the mounting table 18 and the support table 20 for slidingly moving the mounting table 18;
Is fixed to the support base 20 at an arbitrary sliding position.

The mounting base 18 and the support base 20 are formed of a steel member such as a steel plate and have substantially the same size as the bottom surface of the cab 12 forming a rectangular parallelepiped, and have a rectangular shape when viewed from above (FIG. 5). . The mounting portion of the cab 12 on the mounting base 18 is substantially the same as the configuration of the revolving unit frame 10 directly mounted when the cab does not include the cab elevating device. Further, the mounting portion of the support base 20 to the revolving unit frame 10 is configured to be detachable from the revolving unit frame 10 with bolts or the like, or is configured integrally with the revolving unit frame 10. The driver's cab 12 on this mounting base 18
Since the mounting portion of the revolving body frame 10 in the support portion 20 and the support portion 20 do not directly constitute the cab lifting / lowering device itself of the present invention, specific illustration and description will not be complicated. Avoid and omit.

The front ends in the front-rear direction (left ends in FIGS. 3 to 5) of each of the mounting table 18 and the support table 20 are positioned at the same position in the "fixed position". Therefore, when the mounting base 18 is moved from the “fixed position” to the “front upper position” side, its front end protrudes forward from the front end of the support base 20.

Between the mounting table 18 and the support table 20, a sliding direction (indicated by an arrow Y) of the mounting table 18 is shown on the left and right (see FIGS. 3 and 4).
, A pair of sliding mechanisms 26 and 27 are provided. The sliding mechanisms 26 and 27 are formed substantially symmetrically. Therefore, the details will be mainly described in the sliding mechanism 26.

Referring to FIGS. 6 and 7 together with FIGS. 3 to 5, the sliding mechanism 26 extends in the sliding direction Y.
The upper slide member 28 provided on the mount 18 and the support 2
The lower slide member 30 is provided on the support base 20 and slidably supports the upper slide member 28. The lower slide member 30 is provided between the lower slide member 30 and the support base 20 to guide the slide. The slide guide member 31 is provided.

The upper slide member 28 has a lower end on the left and right sides of an outer plate forming the mounting base 18 and a predetermined width W inside the mounting base 18.
At a right angle. The lower surface of the upper slide member 28 defines a sliding surface that slides on the lower slide member 30.

The support 20 has a frame 34 formed by welding a rectangular steel pipe having a width W below the upper slide member 28 inside the outer plate forming the support 20. On the upper surface of the frame 34, a lower slide member 30 extends in a band shape with a rectangular cross section having a width W, and the upper slide member 28
The sliding surface which comes into contact with the sliding surface is defined, and is detachably attached by fastening means such as screws. The lower slide member 30 is formed of a hard resin.

The slide guide member 31 includes a bracket 35 whose end on the "fixed position" side in the sliding direction Y is swingably attached to the support base 20 via a pin 33, and a guide member attached to the bracket 35. 37. The bracket 35 and the guide member 37 are formed to have an inverted L-shaped cross section, and are disposed such that the ends of the sides extending in the horizontal direction are on the outer plate sides of the mounting table 18 and the support table 20. Guide member 37
Is positioned slidably with the upper surface of the upper slide member 28 and the side surface of the frame 34, and with a predetermined gap between the side surface of the upper slide member 28 and the side surface of the lower slide member 30. Between the pair of left and right brackets 35 and 36 (brackets of the sliding mechanism 27), a connecting rod 38 is integrally attached to an end on the “front upper position” side in the sliding direction Y. One end of a pair of hydraulic cylinders 40, 40 constituting the fixing means 24 is attached to the connecting rod 38 (the fixing means 24 will be described later in detail).

Thus, the pair of left and right sliding mechanisms 26 and 2
7, the mounting base 18 moves relative to the support base 20 in the sliding direction Y (the direction perpendicular to the plane of FIG. 6) in the left-right direction (left-right direction in FIG. 6) and the sliding surface, as shown in FIG. The movement in the direction perpendicular to (the vertical direction in FIG. 6) is restricted.

The driving means 22 includes a double-acting hydraulic cylinder 42, which is a pair of telescopic hydraulic cylinders. Each of the hydraulic cylinders 42 has one end rotatably connected to a connecting rod 44 integrally provided to the left and right outer plates of the mounting base 18 and the other end rotatable to the support base 20 via a pin 46. And each is attached. Therefore, by operating the hydraulic cylinder 42 for extension, the cab 1
4 is slid in the direction of "upper front position" shown in FIG.
Is slid in the direction of "fixed position" shown in FIG.

The fixing means 24 comprises a pair of double-acting hydraulic cylinders 40, 4 interposed between the support bar 20 and the connecting rod 38 connected to the guide members of the sliding mechanisms 26 and 27.
0. The hydraulic cylinder 40 is rotatably attached to the connecting rod 38 at one end and at the other end to the support base 20 via a pin 48. Therefore, when the hydraulic cylinder 40 is expanded and contracted, the slide guide member 31 is swung about the pin 33 provided at one end thereof. When the hydraulic cylinder 40 is contracted, the slide guide member 31 presses the upper slide member 28 toward the lower slide member 30 to fix the slide of the upper slide member 28 on the lower slide member 30. On the other hand, when the hydraulic cylinder 40 is extended, as shown in FIG.
Is formed. By forming the gap S, the mounting base 18 becomes slidable. The slide guide member 36 of the swing mechanism 27 on the other side connected by the connecting rod 38 operates in the same manner. Although the gap S is clearly shown in FIG. 7 for easy understanding, it is sufficient that the gap S is substantially large enough for the upper slide member 28 to slide. Further, instead of the extension operation of the hydraulic cylinder 40, the upper slide member 28
Hydraulic cylinder 4 that presses against the lower slide member 30
Alternatively, the hydraulic cylinder 40 may be maintained in a holding state by releasing the pressure oil of 0 and removing the pressing force.

For the operation of the hydraulic cylinder 42 of the driving means 22 and the hydraulic cylinder 40 of the fixing means 24, the boom operating cylinder 14b, the arm operating cylinder 14d, the bucket operating cylinder 14f and the like of the above-described hydraulic shovel 2 (FIG. 1) are operated. For this purpose, pressure oil of a hydraulic pressure source can be used. Therefore, it is not necessary to prepare a special hydraulic source for the driving means 22 and the fixing means 24.

Thus, the driver's cab 12 is mounted obliquely between the front high position "front upper position (FIG. 2)" and the rear low position "fixed position (FIG. 1)", and the mounting table 18 is supported by the support table 20. Above, by the sliding movement by the driving means 22 to an arbitrary position, it can be freely moved up and down to an arbitrary position. And it is releasably fixed at that position by the fixing means 24.

The operation of the cab lift 8 of the construction machine as described above will be described.

(1) Various views: The driver's cab 12 can be slidably moved obliquely between the "fixed position (FIG. 1)" and the "upper front position (FIG. 2)". Compared to horizontal movement or arc movement by link,
The driver's cab 12 can be moved to an arbitrary elevating position, and various fields of view can be secured. Also, the mounting table 18
When the vehicle is moved from the “fixed position” to the “front upper position” side, its front end protrudes forward from the front end of the support base 20, so that the field of view from the cab 12 is obstructed by the support base 20. Is ensured sufficiently.

(2) Stable lifting: The mounting table 18 for mounting the operator cab 12 is mounted on the support table 20 and a pair of left and right sliding mechanisms 26
And 27, the cab 12 is stably supported during the ascent and descent movement of the cab 12, and an cab elevating device without rattling is provided.

(3) Reliable fixation: The fixing means 24 moves the upper slide member 28 of the mount 18 to which the operator's cab 12 is mounted, at the position of the pair of left and right slide mechanisms 26 and 27 below the support stand 20. By pressing and holding between the slide member 30 and the slide guide member 31, the cab 12
Is securely and securely fixed in an arbitrary lifting position.

(4) Improving versatility of construction machinery: cab 12
Can be raised and lowered to an arbitrary position and securely fixed, so that a view from the operator's cab 12 can be secured in accordance with the work in the construction machine such as the hydraulic excavator 2, and efficient work can be performed. . Further, since various operations can be performed by one construction machine, the versatility of the construction machine can be improved.

As described above, the present invention has been described in detail based on the embodiments. However, the present invention is not limited to the above-described embodiments. It can be changed or modified.

(1) Driving means: In the present embodiment, the mounting base 1 interposed between the mounting base 18 and the support base 20
An extendable hydraulic cylinder 42 is provided as the driving means 22 for slidingly moving the mounting 8. Absent. For example, mounting table 1
Either one of the support 8 and the support 20 may be provided with a rack mechanism extending in the sliding direction Y, and the other may be provided with a pinion which is driven to rotate by a hydraulic motor and meshes with the rack.

(2) Fixing means: In this embodiment, the fixing means 24 for fixing the mounting base 18 to the support base 20 at an arbitrary sliding position releases the upper slide member 28 toward the lower slide member 30. Although the telescopic hydraulic cylinder 40 is provided to press freely, it is only necessary to press the upper slide member 28 releasably toward the lower slide member 30. Pressing means may be used.

(3) Fixing means: In the present embodiment, the fixing means 24 includes the double-acting hydraulic cylinder 40 which can be expanded and contracted by pressure oil. Then, the upper slide member 28 is pressed toward the lower slide member 30 by the spring force,
It is also possible to use a single-acting hydraulic cylinder in which this urging force is released by hydraulic pressure.

(4) Hydraulic Cylinder: In the present embodiment, two hydraulic cylinders 42 of the driving means 22 and two hydraulic cylinders 40 of the fixing means 24 are used on the left and right sides, respectively. , One depending on the form, size, etc. of the support base 20.

[0048]

According to the cab lift device for a construction machine constructed in accordance with the present invention, the cab can be stably moved obliquely between a fixed position and a position in front of the fixed position, and Provided is a cab lift device for a construction machine, which can securely fix a cab to an arbitrary sliding position.

[Brief description of the drawings]

FIG. 1 is a side view of a hydraulic shovel, which is a typical construction machine equipped with a cab raising / lowering device configured according to the present invention. The operator's cab is shown as "home position".

FIG. 2 is a side view showing the cab of the hydraulic excavator in FIG. 1 in a “front upper position”.

FIG. 3 is a side view schematically illustrating the cab lifting device in a “fixed position” state.

FIG. 4 is a side view schematically illustrating the operator cab elevating device in a “front upper position” state.

FIG. 5 is an enlarged top view of the cab lift device shown in the direction of arrows AA in FIG. 3;

FIG. 6 is an enlarged cross-sectional view showing a state in which sliding is fixed around a sliding mechanism when viewed in the direction of arrows BB in FIG. 3;

FIG. 7 is an enlarged cross-sectional view showing a state in which the fixing of the sliding is released, with a focus on the sliding mechanism as viewed in the direction of arrows BB in FIG. 3;

[Explanation of symbols]

 2: hydraulic excavator (construction machine) 10: revolving body frame (body) 12: operator's cab 18: mounting base 20: support base 22: driving means 24: fixing means 26: sliding mechanism 27: sliding mechanism 28: upper sliding Member 30: Lower slide member 31: Slide guide member 32: Slide guide member 40: Hydraulic cylinder (fluid pressure cylinder) 42: Hydraulic cylinder (fluid pressure cylinder) Y: Sliding direction

Claims (5)

[Claims] 1. A mounting table to which an operator's cab is mounted, and a mounting table mounted on the body of a construction machine, which is slidable between a "fixed position" and a "front upper position" which is an upper position in front of the mounting table. A support base for supporting, a driving means interposed between the mounting base and the support base to slide and move the mounting base, and a fixing means for fixing the mounting base to the support base at an arbitrary sliding position. A cab elevator for a construction machine. 2. A pair of sliding mechanisms are provided between the mounting base and the support base on the left and right in the sliding direction of the mounting base. Each of the sliding mechanisms extends in the sliding direction, An upper slide member provided on the mounting base, a lower slide member provided on the support base slidably supporting the upper slide member, and a support for nipping the upper slide member between the lower slide member and guiding the slide thereof. The cab lift device for a construction machine according to claim 1, further comprising a slide guide member attached to the base. 3. The cab lift device for a construction machine according to claim 1, wherein said drive means includes a telescopic hydraulic cylinder. 4. The slide guide member has one end in the sliding direction swingably attached to a support base, and the fixing means is interposed between the slide guide member and the support base, and 4. The cab lift device for a construction machine according to claim 2, further comprising an extendable fluid pressure cylinder that swings and presses the upper slide member releasably toward the lower slide member. 5. The mounting base according to claim 1, wherein a front end of the mounting base projects forward from a front end of the support base at a position shifted from the “fixed position” to the “front upper position” side. 4
The cab lifting device for a construction machine according to any one of the above.