JPH0715856U - Construction machinery guard opening and closing device - Google Patents

Abstract

(57) [Summary] [Purpose] In a guard opening / closing device for construction machinery, a guard is hinged to the side surface of the vehicle body so as to be vertically rotatable, and a gas cylinder for power assist is attached to the inside of the guard to mount the guard. Some are designed to open and close. However, since the stroke and thrust of the gas cylinder were limited and the guard could not be opened sufficiently high, it was inconvenient during maintenance work. This problem is solved. [Structure] According to the present invention, a link is provided on the fixed plate of the vehicle body below the hinge member hinged to the guard, and the lower end of the link and the lower end of the power assist cylinder are pin-joined. Provide a guide bracket on the fixed plate near the bottom of the link, and for the guide bracket,
When the guard is open, the pin coupling portion is selectively lockable between the guard closed position and the outer position.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention mainly relates to a guard opening / closing device mounted on a body of a construction machine such as a hydraulic excavator or a work vehicle.

[0002]

[Prior art]

 FIG. 6 is a perspective view of a main part of a hydraulic excavator equipped with a guard opening / closing device of the related art. In the figure, 1 is an upper revolving structure which is a vehicle body of a hydraulic excavator, 2 is a lower traveling structure, 3 is a guard, 4 is a hinge in which the guard 3 is hinged to a side surface of the upper revolving structure 1, and 5 is an engine. . As shown in FIG. 6, in the guard opening / closing device of the prior art, in order to perform maintenance of the engine (5) inside the upper revolving structure (1), the guard 3 is hinged so that the guard 3 can be opened and closed in the left and right front and rear directions. It is attached to the upper revolving structure via 4.

[0003]

[Problems to be solved by the device]

 Since the guard opening / closing device of the prior art is designed to open and close the guard in the left-right front-back direction, the working environment of the operator who performs maintenance during sunlight exposure or during rain / snow was unfavorable. For this reason, recently, although not shown, a guard is hinged on the side surface of the vehicle body so as to be rotatable in the vertical direction, and a gas cylinder for power assist is attached to the inside of the guard to open and close the guard. However, it was not possible to open the guard sufficiently high because the stroke and thrust of the gas cylinder were limited. Therefore, it is inconvenient because it is not possible to increase the opening degree of the guard depending on the maintenance work. The present invention aims to solve this problem.

[0004]

[Means for Solving the Problems]

 According to the present invention, a thin-plate guard extending from the upper surface portion to the side surface portion of the body of a construction machine is attached so as to be pivotable in the vertical direction about a hinge member provided on the upper portion of the body, and the inner surface portion of the guard and the vehicle body. In a guard opening / closing device in which a power assisting cylinder is interposed between the guard and an internal fixing part, a link is provided on the fixing plate of the vehicle body below the hinge member hinged to the guard, and the upper end of the link is provided. Part is rotatably attached in the same direction as the opening and closing direction of the guard, the lower end of the link and the lower end of the cylinder for power assist are pin-connected, and the guide bracket is attached to the fixing plate near the lower part of the link. The guide bracket is provided with a guide groove hole that allows the pin coupling part to move to a position outside the guard closed position by a predetermined dimension. Parts and selectively lockably configured to guard the closed position and the outer position.

[0005]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a side view of a hydraulic excavator equipped with a guard opening / closing device of the present invention. In the figure, 6 is an upper swing body which is a vehicle body of a hydraulic shovel, 7 is a lower traveling body, and 8 is provided on a side surface portion of an outer peripheral surface portion (including a front surface portion and a rear surface portion) of the upper swing body 6. A guard, 9 is a hinge member such as a hinge (including a link for connection) that hinges the guard 8 to the upper body 6, and 10 is a gas cylinder for power assist mounted on the inner surface of the guard 8. Is. FIG. 2 is a view showing the guard opening / closing device of the present invention seen from AA of FIG. In the figure, 11 is a support plate fixed inside the upper revolving structure 6, a fixed plate such as a support, 12 is a link bracket fixed on the upper side of the fixed plate 11, and 13 is fixed on the lower side. A guide bracket, 14 is a link, 15 is a cylinder mounting bracket fixed to the inner surface of the guard 8, and H1 is the first opening height of the guard 8 when the gas cylinder 10 is maximally extended. FIG. 3 is a detailed view of part B of FIG. In the figure, 16 is a guide groove hole formed in the guide bracket 13, 17 is a recess for locking the outer position of the guide groove 16, 18 is a recess for locking the guard closing position, and 19 is a lower end of the link 14. And a lower end portion of the gas cylinder 10, a link pin 20 and a long hole 21 for inserting the link pin (20), which is elongated in the longitudinal direction of the link 14. In FIG. 3, the connecting pin 19 is locked in the guard closing position locking recess 18, but in FIG. 5 described later, the connecting pin 19 is not in the guard closing position locking recess 18. FIG. 4 is a sectional view taken along line CC of FIG. FIG. 5 is an embodiment diagram showing a state in which the coupling pin 19 in FIG. 3 is moved to the outer position locking recess 17.

Next, the structure of the guard opening / closing device of the present invention will be described with reference to FIGS. According to the present invention, the link 14 is provided below the hinge member 9 that hinges the guard 8 and on the upper side of the fixed plate 11, and the upper end of the link 14 is rotated in the same direction as the opening and closing direction of the guard 8. The link pins 20 were attached to the link brackets 12 fixed to the fixed plate 11 in a dynamic manner. Then, the lower end of the link 14 and the lower end of the gas cylinder 10 are connected by a connecting pin 19, and a guide bracket 13 is provided on the fixing plate 11 near the lower part of the link 14, and the guide bracket 13 is attached to the guide bracket 13. The connecting pin 19 is located outside the guard closing position (guard closing position locking recess 18) by a predetermined dimension 1 (shown in FIGS. 3 and 5) (the outer position is the outer position locking recess 17). ) Is formed so that the connecting pin 19 can be selectively locked in the guard closing position locking recess 18 and the outer position locking recess 17 when the guard 8 is open. Configured.

Next, the operation of the guard opening / closing device of the present invention will be described. In a hydraulic excavator, it is desirable to open the guard 8 as large as possible so as to be able to handle various maintenance work, but the gas cylinder 10 for power assist has a limit in thrust and stroke S (shown in FIG. 2). For that purpose, the cylinder mounting bracket 15 fixed to the inner surface of the guard 8 is set at a position of a distance R from the axis of the hinge member 9. Therefore, when the guard 8 is opened and closed, the cylinder mounting bracket 15 moves along a locus of radius R centering on the axial center of the hinge member 9. In the first case where normal maintenance work is performed, the lower end of the gas cylinder 10 is locked in the guard closing position locking recess 18 of the guide bracket 13 to extend the gas cylinder 10. When the gas cylinder 10 is maximally extended, the inclination angle of the gas cylinder 10 becomes an angle θ1 as shown in FIG. 2, and the height H1 of the first opening of the guard 8 can be set.

Next, in the second case where it is desired to open the guard 8 higher than the first opening opening height H1 as required, the link 14 in the state shown in FIG. 2 is lifted by hand. Since the hole for inserting the link pin (20) of the link 14 is formed as an elongated hole, the coupling pin 19 at the lower end of the link (14) is locked from the guard closing position locking recess 18 of the guide bracket 13. It can be canceled. Therefore, the coupling pin 19 is moved outward along the guide slot 16. Then, the coupling pin 19 is fitted and locked in the outer position locking recess 17 so that the position of the locking pin 19 moves outward by a dimension l (shown in FIGS. 3 and 5). As shown in FIG. 5, the inclination angle θ2 of the gas cylinder 10 is an angle close to a right angle, and the angle θ2 is considerably larger than the inclination angle θ1 of the gas cylinder 10 in the first case. Therefore, in this second case, the gas cylinder 10 is placed in a substantially vertical state, so that the maximum extension length of the gas cylinder 10 can be fully utilized. In the second case, the height of the second opening of the guard 8 becomes the height H2 as shown in FIG. 3, and the guard 8 can be opened larger than the first opening height H1 by the dimension ΔH. When closing the guard 8 set to the second open opening height H2, the position of the connecting pin 19 is returned from the outer position locking recess 17 to the guard closing position locking recess 18 to close the guard 8. .

[0009]

[Effect of device]

 In a guard opening / closing device for construction machinery, a guard is hinged to the side surface of the vehicle body so as to be vertically rotatable, and a gas cylinder for power assist is attached to the inside of the guard to open and close the guard. is there. However, it was not possible to open the guard high enough because of the limited stroke and thrust of the gas cylinder. Therefore, it is inconvenient because it is necessary to increase the opening degree of the guard depending on the maintenance work, but this cannot be done. In order to solve this problem, in the present invention, a link is provided on the fixed plate of the vehicle body below the hinge member on which the guard is hinged, and the upper end of the link is rotated in the same direction as the opening and closing direction of the guard. It is freely attached, and the lower end of the link and the lower end of the cylinder for power assist are pin-joined, and a guide bracket is provided on the fixed plate near the lower part of the link. A guide groove hole is formed so that the part can move to a position outside the guard closed position by a predetermined dimension, and the pin coupling part can be selectively locked in the guard closed position and the outer position when the guard is open. Configured. As a result, in the first case where the guard is opened and normal maintenance work is performed first, the lower end of the gas cylinder is locked in the guard closing position locking recess of the guide bracket to extend the gas cylinder. When the gas cylinder is maximally extended, the gas cylinder is in a state of being inclined at a large angle, but the first opening height can be set. Next, in the second case in which it is desired to open higher than the first opening height, the link is manually lifted to move the coupling pin from the guard closing position recess to the outer position locking recess for fitting and locking. The gas cylinder is in a substantially vertical state, and a higher second opening opening height can be set. Further, the guards can be set to a plurality of opening opening heights by forming the outer position locking recesses at a plurality of locations as required. In this invention, the maximum extension length of the gas cylinder for power assist, which has limited thrust and stroke, can be fully utilized to greatly adjust the opening height of the guard, improving maintenance workability. it can.

[Brief description of drawings]

FIG. 1 is a side view of a hydraulic excavator equipped with a guard opening / closing device of the present invention.

FIG. 2 is a view showing the guard opening / closing device of the present invention viewed from AA of FIG.

FIG. 3 is a detailed view of a B part in FIG.

FIG. 4 is a sectional view taken along line CC of FIG.

FIG. 5 is an embodiment diagram showing a state in which the coupling pin in FIG. 3 is moved to an outer position locking recess.

FIG. 6 is a perspective view of a main part of a hydraulic excavator equipped with a guard opening / closing device according to a conventional technique.

[Explanation of symbols]

 1,6 Upper revolving structure 3,8 Guard 9 Hinge member 10 Gas cylinder 11 Fixed version 12 Link bracket 13 Guide bracket 14 Link 15 Cylinder mounting bracket 16 Guide groove hole 17 Outer position locking recess 18 Guard closing position Stop recess 19 Coupling pin 20 Link pin 21 Long hole

Claims (1)

[Scope of utility model registration request] 1. A thin plate guard extending from an upper surface portion to a side surface portion of a vehicle body is attached so as to be pivotable in an up and down direction about a hinge member provided at an upper portion thereof, and fixed to an inner surface portion of the guard and an inside of the vehicle body. In a guard opening / closing device in which a power assisting cylinder is provided between the guard and the vehicle body, a link is provided on a fixed plate of the vehicle body below the hinge member hinged to the guard, and the upper end of the link is connected to the guard. It is attached rotatably in the same direction as the opening and closing direction, the lower end of the link and the lower end of the power assist cylinder are pin-joined, and a guide bracket is provided on the fixing plate near the lower part of the link. A guide groove hole is formed in the bracket for the pin coupling part so that the pin coupling part can move to a position outside the guard closed position by a predetermined dimension, and the pin coupling part is closed when the guard is opened. A guard opening / closing device for a construction machine, which is configured so that it can be selectively locked at an outer position and an outer position.