JPH0635867Y2 - Traveling operation mechanism of tracked construction machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a travel operation mechanism of a track-type construction machine having an upper swing body.

Prior Art FIG. 6 is an overall side view of a conventional hydraulic excavator.
In the figure, 1 is a lower traveling body, 2 and 3 are traveling motors attached to the rear portions of the left and right lower traveling bodies 1, 4 is a crawler belt, 5 is an upper swing body, 6 is a driver's cab, and 7 and 8 are left and right traveling levers. 9 is a swinging device, and 10 is a boom attached to the front part of the upper swinging body 5.

Therefore, the upper revolving structure 5 is provided on the lower traveling structure 1 through the revolving device 9, and the left and right traveling levers provided in the cab 6 are provided.
The traveling operation of the lower traveling structure 1 is performed by 7,8.

Problems to be Solved by the Invention When the upper revolving structure of the hydraulic excavator is rotated to perform work, the forward direction of the upper revolving structure may be opposite to the forward direction of the lower traveling structure. When the driver runs the lower traveling body in this state, for example, if the traveling lever is operated in the forward direction, the lower traveling body starts moving toward the rear side of the upper swing body. Therefore, the driver of the upper-swing construction machine operates the traveling lever while confirming the traveling motor position of the lower traveling body at the time of starting traveling. As a result, workability is deteriorated and erroneous operation may occur, which is extremely dangerous.

This invention solves the above problems, and when the forward direction of the upper revolving structure is opposite to the forward direction of the lower traveling structure, the forward / reverse operation of the traveling lever is automatically switched,
On the other hand, it is an object of the present invention to provide a traveling operation mechanism for a track-type construction machine capable of displaying a traveling direction of a lower traveling body with respect to an operation direction of a traveling lever on a driver's cab display.

Means for Solving Problems The means of the present invention taken to solve the above problems are: A plurality of limit switches that detect the relative positions of the lower traveling structure and the upper revolving structure of the tracked construction machine are provided on the front side of the lower surface of the upper revolving structure and on the same radius as the revolving center of the upper revolving structure. ． In addition, a semicircular donut-shaped block member is fixedly provided on the upper half of the upper surface of the lower traveling body along the same radius as the limit switch mounting radius. On the other hand, a forward / reverse switching solenoid valve is provided in the operating circuit of the left and right traveling motors for the undercarriage or the pilot circuit for traveling valve operation. When the upper revolving structure is revolved, the forward / reverse switching solenoid valve is moved from the forward position to the reverse position only when the contacts of the plural limit switches all come into contact with the upper surface of the semicircular donut-shaped block member. In addition to being switchable, e. The traveling direction of the lower traveling body with respect to the operating direction of the traveling lever can be displayed on the operator's cab display.

Action a. Two limit switches are provided symmetrically on the left and right sides on the front side of the lower surface of the upper revolving structure and at the same radius above the revolving center of the upper revolving structure. In addition, a semicircular donut-shaped block member is fixedly provided on the upper half of the lower traveling body along the same radius as the limit switch mounting radius over a range of a total length of about 180 °. Therefore, when none of the contacts of the two limit switches are in contact with the upper surface of the semi-circular donut-shaped block member, and when one of the contacts of the limit switch is in contact with the block member, respectively. , The forward / reverse switching solenoid valve provided in the hydraulic circuit does not switch. Then, when the traveling lever is operated in the forward direction, the lower traveling body starts traveling in the forward direction, and the traveling direction is indicated by the direction of the arrow lit on the cab display.

B. When the contacts of each of the two limit switches in the above item a are in contact with the semicircular donut-shaped block member, the forward / reverse switching solenoid valve provided in the hydraulic circuit is switched from the forward position to the reverse position. Replace As a result, when the front direction of the upper revolving structure is reversed with respect to the forward direction of the lower traveling structure, operating the traveling lever in the forward direction causes the lower traveling structure to start traveling in the front direction of the upper revolving structure. The direction of travel is indicated by the direction of the arrow lit on the operator's cab display.

C. When the driver operates the traveling lever in the forward direction as in the above-mentioned items (a) and (b), the traveling start direction of the undercarriage is indicated by an arrow in the display. Also,
Even if the front and rear relative positions of the upper revolving structure and the lower traveling structure are reversed, when the traveling lever is operated in the forward direction, the construction machine starts traveling forward in the front direction of the upper revolving structure.

Embodiment Hereinafter, a traveling operation mechanism of a track-type construction machine according to the present invention will be described in detail with reference to the drawings. In the figure, the same reference numerals are given to those using the same constituent elements as those in the conventional technique. FIG. 1 is a cutaway plan view of a hydraulic excavator having a traveling operation mechanism according to the present invention. In the figure,
1'is a lower traveling structure, 5'is an upper rotating structure, 11 and 12 are limit switches attached to the lower surface of the upper rotating structure 5 ', 13 respectively.
Is a semicircular donut-shaped block member fixedly provided on the upper surface of the lower traveling body 1 '. FIG. 2 is a cross-sectional view of the swivel device 9 ', showing a state in which the contact a of the limit switch 11 is in contact with the upper surface b of the semicircular donut-shaped block member 13.
In the figure, 14 is a swivel joint, 15 is a slewing reducer, 16 is a lower plate of the upper slewing body 5 ', and 17 is a lower traveling body 1'.
A grease shield plate on the upper surface and a slewing bearing 18 are provided. FIG. 3 is a hydraulic / electrical circuit diagram of a hydraulic excavator having a traveling operation mechanism according to the present invention. In the figure, 19 and 20 are main pumps, 21 is a pilot pump, and 22 and 23.
Is a traveling valve of the left and right traveling motors 2 and 3, 24 is a forward / reverse switching solenoid valve, 25 is a solenoid of the solenoid valve 24, 11 and 12 are limit switches, 26, 27 and 28 are indicators.
An indicator lamp arranged within 29, 30 is a diode, 31 is a key switch, and 32 is a power supply. FIG. 4 is a front view of the indicator 29 installed in the driver's cab, where F is the upper revolving structure 5 '.
, R is the rear direction, arrow C is the display direction of the display lamp 26, arrow D is the display direction of the display lamp 27, and arrow E is the display direction of the display lamp 28. FIG. 5 shows the display state of the indicator 29 at each position when the upper revolving structure 5 ′ is rotated with respect to the lower traveling structure 1 ′ (the arrow with diagonal lines is lit up to indicate the lower traveling structure 1 ′). FIG. 6 is a plan view showing the direction of travel).

Next, the configuration of the traveling operation mechanism according to the present invention is shown in FIG.
Referring to FIG. Two limit switches 11,1 for sensing the relative positions of the undercarriage 1'and the upper swing body 5 '
2 on the front side of the lower surface of the lower surface plate 16 of the upper revolving structure 5'and symmetrically with respect to the F (front) direction at a set angle θ ₁ (0 ° <θ ₁ <
About 45 °) and is provided at a position on the same radius R ₁ from the swing center O of the upper swing body 5 ′. Also, the undercarriage 1 '
The grease shield plate 17 has an angle θ on the upper half of the upper surface.
_A semicircular donut-shaped block member 13 was fixedly provided along the same radius as the mounting radius R _{1 of the} limit switches 11 and 12 over a range of ₂ (approximately 180 °). On the other hand, the operating circuit of the left and right traveling motors 2 and 3 for the lower traveling body 1 '(oil passages 33, 34, 35, 3
6) Alternatively, a forward / reverse switching solenoid valve 24 is provided in the pilot circuit for operating the pilot type travel valve (not shown).
Only when the contacts of the two limit switches 11 and 12 come into contact with the upper surface b of the semi-circular donut-shaped block member 13 when the upper revolving structure 5'is swung, the forward / reverse switching electromagnetic waves are made. The valve 24 can be switched from the forward position to the reverse position. At the same time, the traveling direction of the lower traveling unit 1'with respect to the operating direction of the traveling levers 7 and 8 is displayed in the driving room.
Configured to be displayable on 29.

Next, the function and function of the traveling operation mechanism according to the present invention will be described. The key switch 31 in the electric circuit is turned on to operate the hydraulic excavator. When none of the contacts of the limit switches 11 and 12 are in contact with the upper surface b of the semicircular donut-shaped block member 13, the limit switch 1
The switch lamps 1 and 12 are in the ON state, so that the indicator lamp 26 is lit. But the diode
Since the solenoid 25 is de-energized by 30, the solenoid valve 24 remains in the forward position. Therefore the traveling lever
If 7, 8 are operated in the forward direction, the lower traveling body 1'will display 2
9 Proceed and start in the direction of the inner arrow C. Next, when only the contact b of the limit switch 11 is in contact with the upper surface b of the block member 13, the switch in the limit switch 11 is in the off state, but the switch is in the on state. Further, since the switch within the limit switch 12 is in the ON state, the display lamp 27 lights up. But the solenoid 25
Is not energized, the solenoid valve 24 remains in the forward position. Therefore, when the traveling levers 7 and 8 are operated in the forward direction, the lower traveling body 1'starts traveling in the direction of the arrow D in the display 29. Next, when only the contact of the limit switch 12 is in contact with the upper surface b of the block member 13, the switches in the limit switches 11 and 12 are turned on in the same manner as described above. 28 lights up. However, since the solenoid 25 is not energized, the solenoid valve 24 remains in the forward position. Therefore, when the traveling levers 7 and 8 are operated in the forward direction, the lower traveling body 1 '
Starts in the direction of arrow E in the display 29. Next, when the contacts of the limit switches 11 and 12 both come into contact with the upper surface b of the block member 13, the limit switches 11 and 12 are contacted.
Switch No. and Wa are turned on. The display lamp 26 lights up and the solenoid 25 is energized.
Therefore, the solenoid valve 24 is switched from the forward position to the reverse position. Therefore, when the traveling levers 7 and 8 are operated in the forward direction, the lower traveling body 1 ′ advances and starts in the direction of the arrow C in the display 29. That is, in this case, the relative positions of the upper revolving structure 5'and the lower traveling structure 1'are opposite to each other, but when the traveling levers 7 and 8 are operated in the forward direction, the lower traveling structure moves forward in the upper revolving structure 5 '. The body 1'can be progressively started.

As described above, if the driver operates the traveling levers 7 and 8 in the forward direction while the upper revolving structure 5 ′ is revolving, the lower traveling structure 1 ′ lights up in the display 29. Proceed and start in the direction of the arrow indicated. Therefore, the driver may operate the traveling levers 7 and 8 by visually observing the display 29 without checking the position of the lower traveling body 1'each time. Even if the relative positions of the upper revolving structure 5'and the lower traveling structure 1'are reversed, operating the traveling levers 7 and 8 causes the hydraulic excavator to start moving forward in the front direction of the upper revolving structure 5 '. Therefore, erroneous operation is prevented.

Effect of the Invention When the upper revolving structure of the hydraulic excavator is operated by revolving, the forward direction of the upper revolving structure changes with respect to the forward direction of the lower traveling structure. In the conventional hydraulic excavator, for example, when the traveling lever is operated in the forward direction when the relative positions of the lower traveling structure and the upper revolving structure are reversed, the lower traveling structure advances and starts toward the rear side of the upper revolving structure. Therefore, the driver of the upper-swing construction machine operates the traveling lever while confirming the traveling motor position of the lower traveling body at the time of starting traveling. As a result, workability is deteriorated and erroneous operation may occur, which is extremely dangerous.

However, in the traveling operation device according to the present invention, the upper swing body is provided with a plurality of limit switches to detect the relative position with respect to the lower traveling body, and the traveling lever is moved forward in the indicator provided in the cab. The starting direction of travel of the undercarriage when the button is operated is displayed. Also, when the relative position of the lower traveling structure and the upper revolving structure is reversed,
The forward / reverse switching solenoid valve automatically switches, and when the traveling lever is operated in the forward direction, it advances forward in the forward direction of the upper revolving structure, and conversely, when the traveling lever is operated in the reverse direction, it moves backward in the upper revolving structure. Start progressing. That is, even when the upper revolving structure faces the front or rear direction with respect to the lower traveling structure, the driver can perform an operation based on the direction in which the revolving structure is facing. Therefore, the traveling operation mechanism according to the present invention can prevent an erroneous operation when the track-type construction machine having the upper-part turning body is started in advance to improve safety and improve workability.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cutaway plan view of a hydraulic excavator having a traveling operation mechanism according to the present invention, FIG. 2 is a sectional view of a swivel device according to the present invention, and FIG. FIG. 4 is a front view of the indicator, FIG. 5 is a plan view showing the display state of the indicator when the upper swing body is rotated with respect to the lower traveling body, and FIG. FIG. 1 is an overall side view of a conventional hydraulic excavator. 1,1 ′ …… Lower traveling body 2,3 …… Travel motor 5,5 ′ …… Upper swing body 7,8 …… Travel lever 9,9 ′ …… Swing device 11,12 …… Limit switch 13 …… Block member 16 …… Bottom plate 17 …… Grease shield plate 24 …… Solenoid valve 26,27,28 …… Indicator lamp 29 …… Indicator

Claims (1)

[Scope of utility model registration request] 1. A track-type vehicle in which the revolving structure is rotatably provided on a lower traveling structure via a revolving device, and a traveling lever of the upper revolving structure provided in a driver's cab is used to operate the lower traveling structure. In a construction machine, a plurality of limit switches for sensing the relative position of the lower traveling body and the upper revolving body,
A semi-circular donut-shaped block is provided on the front side of the lower surface of the upper revolving superstructure and at the same radius above the revolving center of the upper revolving superstructure, and on the rear half of the upper surface of the lower revolving superstructure along the same radius as the above limit switch mounting radius. When the upper and lower revolving bodies are swung, the member is fixed and the forward / reverse switching solenoid valve is installed in the operation circuit of the left and right traveling motors for the lower traveling body or the pilot circuit for traveling valve operation. The forward / reverse switching solenoid valve can be switched from the forward position to the reverse position and the travel lever can be operated only when the contacts of the plural limit switches all come into contact with the upper surface of the semicircular donut-shaped block member. A traveling operation mechanism for a track-type construction machine, characterized in that a traveling direction of a lower traveling body with respect to a direction can be displayed on a driver's cab display.