JPH026128Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a variable blade for construction machinery.

For construction machinery vehicles such as motor graders, variable blades have been developed to improve work efficiency by quickly adjusting the blade length according to conditions such as road work, site conditions, soil quality, snow quality, etc. ing.

Figure 1 shows a state in which a variable blade is attached to a motor grader a.The variable blade usually has sub blades c arranged on the left and right front surfaces of a main blade b in the center, and each sub blade c is connected to a hydraulic cylinder d on the left and right. The blade b is configured to extend and contract outwardly from the main blade b. Further, the front surface of the sub-blade C also serves as a cutting edge to prevent wear during operation, and when it wears out, it is necessary to replace the entire surface. Furthermore, when replacing the parts, work efficiency was reduced and materials were wasted due to the large size and weight.

Furthermore, if there is hard dirt, snow, or other deposits on the front surface of the main blade b, when the sub blade c passes through that area, the sub blade c may be forcibly separated from the front surface of the main blade b, resulting in damage to the device. It had the disadvantage of being exposed to.

The present invention was proposed in view of the above circumstances, and is a variable blade for construction machinery in which a main blade and a sub-blade disposed in front of the main blade are connected by a hydraulic cylinder for extending and retracting the sub-blade. A variable blade for a construction machine, characterized in that a tapered surface formed on the lower end surface of the auxiliary blade and an upper end surface of a cutting edge fixed to the front surface of the main blade are engaged with each other, and the object thereof is The object of the present invention is to provide an improved variable blade for construction machinery in which the sub-blade is not pulled forward by dirt, snow, etc. adhering to the main blade.

As described above, in the present invention, a tapered surface is formed on the lower end surface of the sub blade arranged on the front surface of the main blade, and the tapered surface is formed on the upper end surface of the cutting edge fixed on the front surface of the main blade. Since they are meshed, the gap between the main blade and the sub blade is prevented from opening when the sub blade passes through a place on the front surface of the main blade where hard earth, sand, snow, etc. have adhered when the sub blade expands and contracts. This makes it possible to ensure finishing accuracy and to make the device more robust.

The present invention will be described below with reference to the illustrated embodiments.

1 is a main blade, and a U-shaped holding frame 3 is attached to the back of a mold board 2 that is curved so as to bulge out forward.
partition plates 4a, 4 to which the holding frame 3 and the mold board 2 are fixed and which connect and reinforce the two members;
b, and a pair of upper and lower support tubes 5 extending in the longitudinal direction between the partition plates 4a and 4b, and a pair of upper and lower rails 3a extending in the longitudinal direction are fixed to the back surface of the holding frame 3. has been done. Note that elongated holes 2a extending in the longitudinal direction are cut out on both left and right sides of the mold board 2, and bosses 1, which will be described later, are cut out.
0 and the bolt 15 are adapted to slidably fit together.

Reference numeral 6 denotes a sub-blade, which is composed of a plate 8 erected on the back of a wing board 7 which is curved so as to bulge out forward, and a shaft 9 fixed to the top and bottom of the plate 8 in parallel with the wing board 7. Each shaft 9 is slidably fitted into each support cylinder 5.

A cutout 7a is cut out below the wing board 7, and the upper edge of the cutout 7a has a tapered surface 7b.
A boss 10 is fixed to the upper rear surface of the tapered surface 7b for the purpose of protecting bolts, discharging dirt, etc. stuck in the elongated hole 2a, and reinforcing the elongated hole 2a.

11 is a hydraulic cylinder, one end of which is connected to the main blade 1.
Attach the other end to the sub-blade 6, respectively, with a bracket 1a,
It is pivotally connected via 6a.

Reference numeral 12 denotes a pair of left and right cutting edges, which are fixed to the main blade 1 via bolts 13. The cutting edges 12 are formed symmetrically so that they can be attached interchangeably to the left and right sides.

A wing edge 14 is fixed to the front surface of the sub-blade 6 with bolts 15 and 18. The wing edge 14 has a plurality of two rows of bolt holes 14a arranged in parallel, and are drilled symmetrically between the vertical and horizontal center lines, so that the wing edge 1
4 can be installed vertically and horizontally.

A side edge 16 is fixed to the front end surface of the sub blade 6 with the bolts 15 and 18. A plurality of bolt holes 16a are drilled in one row in the side edge 16, and are arranged vertically and horizontally symmetrically across the vertical and horizontal center lines, so that the side edge 16 can be installed interchangeably vertically and horizontally.

An end bit 17 is fixed by inserting a part of the wing edge 14 and side wedge 16 into the front end surface of the sub blade 6 and tightening them together with a bolt 18.

Since the illustrated embodiment is configured as described above, the secondary blade 6 can be attached to the rear surface of the wing board 7 by expanding and contracting the hydraulic cylinder 11 interposed between the main blade 1 and the secondary blade 6. The shaft 9 attached to the plate 8 and the same shaft 9
The length of the blade can be freely changed by expanding and contracting the main blade 1 laterally using the support cylinder 5 on the back surface of the main blade 1 into which the main blade 1 is slidably inserted as a guide.

The upper surface of the cutting edge 12 attached to the main blade 1 is slidably engaged with the tapered surface 7b of the notch 7a of the wing board 7 in the sub-blade 6, so that the sub-blade 6 is protected against external forces, etc. This prevents the blade from being pulled away from the front surface of the main blade 1.

Further, the cutting edge 12 attached to the front surface of the lower end of the main blade 1 is structured to enter into the notch 7a of the wing board 7 in the sub blade 6, and the cutting edge 12 in that part
is the upper bolt hole 14 at the front of the lower end of the sub blade 6.
It is fixed with bolts 15 using only a.

Note that the unused bolt hole 14a is required when the wing edge 14 is exchanged vertically or horizontally.

Furthermore, elongated holes 2a extending in the longitudinal direction are cut out on both left and right sides of the mold board 2 in the main blade 1, so that even if the wing edge 14 is on the surface of the main blade 1, it can be inserted through the elongated holes 2a. It is fixed with bolts 15. Further, a boss 10 is provided on the upper back surface of the tapered surface 7b of the lower notch 7a of the wing board 7 in the sub blade 6 in the same line as the bolt hole of the bolt 15, so that the sub blade 6 is placed on the side of the main blade 1. This protects the bolt when it slides in the opposite direction, removes dirt, pebbles, etc. that have entered the elongated hole 2a, and prevents damage to the hydraulic cylinder 11, shaft 9, etc. due to uplifting loads from below.

The wing edge 14 is replaced after the hydraulic cylinder 11 is extended and the bolt 15 closest to the center of the main blade 1 is pushed out from the outlet of the elongated hole 2a.

In addition, a side edge 16 is provided on the lower end surface of the sub blade 6, which is most likely to be worn, so that it can be easily replaced.Since the side edge 16 and the wing edge 14 are vertically and horizontally symmetrical, when worn, Since it can be used interchangeably up and down or left and right, each end face can be used without wasting it. At this time, the wing edge 14 and the side edge 16 have a small shape and are light in weight, so that the labor required for replacing them is small and the work can be done at low cost.

Furthermore, since the end bit 17 is attached to the sub-blade 6, wear on the side surface is prevented.
In addition, replacement due to wear is easily performed.

In the variable blade shown in the illustrated embodiment, the tapered surface 7b of the lower notch 7a of the wingboard 7 of the sub-blade 6 is connected to the cutting edge 1 attached to the main blade 1.
2, there is no risk that the secondary blade 6 will be pulled away forward due to dirt, snow, etc. adhering to the main blade 1 when the secondary blade 6 expands or contracts.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an outline of a motor grader equipped with a variable blade; FIG. 2 is a perspective view showing an embodiment of the variable blade of a construction machine according to the present invention;
Figure 3 is an exploded slope view, Figure 4 is a view taken in the direction of the arrows in Figure 1, Figure 5 is a view taken in the direction of the arrows in Figure 1, Figure 6 is a view taken in the direction of the arrows in Figure 1, and Figure 7. is a view taken from the arrow in FIG. 4, FIG. 8 is a front view showing the operating state of the variable blade, FIG. 9 is a front view of the wing edge,
Fig. 10 is a side view thereof, Fig. 11 is a front view of the side edge, Fig. 12 is a side view thereof, and Fig. 13 is a slope view of the wing board. 1...Main blade, 6...Secondary blade, 7...
Wing board, 7a... lower notch, 7b...
Tapered surface, 12...cutting edge.

Claims (1)

[Scope of utility model registration request] In a variable blade for a construction machine in which a main blade and a sub-blade disposed in front of the main blade are connected by a hydraulic cylinder for extending and retracting the sub-blade, a tapered surface formed on a lower end surface of the sub-blade and a tapered surface formed on a lower end surface of the sub-blade, A variable blade for construction machinery, characterized in that the variable blade engages with the upper end surface of a cutting edge fixedly installed on the front surface of the blade.