JPS6326448Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a lining attachment for earthwork work, such as a blade or a bucket, which is installed on an earthmoving vehicle, and particularly relates to an attachment in which the related structure between a reversible cutting edge and a lining plate is improved.

In a bulldozer blade, which is a well-known attachment of this type, the soil removal performance and soil rolling performance of the blade surface during excavation work have a large effect on work efficiency, fuel efficiency, and the like. The soil removal performance and soil rolling performance of the blade surface are determined by the coefficient of friction and adhesion of the blade surface to the excavated soil.

However, since the blade is made of a steel plate, the friction coefficient and adhesion of soil on the blade surface are high, causing poor soil removal and soil curling, and this tendency is particularly noticeable when dozer work is performed in wetlands. This is a major cause of a significant drop in work efficiency, increased fuel consumption, and engine stalling.

Therefore, it is already known that a resin-based lining plate is attached to the front surface of a steel plate blade in order to improve the soil removal performance of the blade surface.

However, as shown in FIG. 1, conventionally, as a means for attaching the lower part of the lining plate 2 covering the front surface of the steel plate blade 1, the lower edge 2a of the plate is fitted into the lower part 4 between the upper ends of the cutting edge 3. It's just making them match. Therefore, various inconveniences arise due to the lower attachment of the lining plate.

That is, this type of cutting edge 3 has edge portions 3a and 3b formed on both the upper edge and the lower edge,
Moreover, since the intermediate portion is removably fixed with a bolt/nut 5, it can be used in reverse when the downward edge portion 3b is worn out.

A bottom portion 4 between the upper ends of the cutting edge 3,
If the lower edge part 2a of the lining plate 2 is fitted and engaged with the back side of the so-called upward edge part 3a as described above, when the edge is reversed, the worn downward edge part 3b turns upward and the lower edge part 2a of the lining plate 2a. Since the lower edge cannot be reached, engagement of the lower edge becomes impossible.

Therefore, although the edge 3 has been designed to be able to be reversed, the actual situation is that the edge cannot be used in reverse when the downward edge portion 3b is worn out.

Moreover, even before the edge is reversed, the lower edge 2 of the lining plate relative to the upward edge portion 3a is
Since the amount of hook a is extremely small, there is a concern that the lining plate 2 may easily come off due to a slight impact during work such as dozing.

In particular, the smaller the earthmoving vehicle is, the smaller the thickness 4 of the edge portion 3a becomes, making it extremely difficult to attach the lower edge portion 2a of the lining plate to the gap.

Furthermore, since considerable earth pressure acts on the lining plate surface during dozing work, etc., the lower edge 2 of the plate
It is easy for dirt, etc. to invade from the narrow part between the blade 1 and the upward edge part 3a, and the intruded dirt, etc. also reaches the space between the blade 1 and the lining plate 2, which causes the plate to float up. This will eventually result in damage or dislodgement.

Therefore, as shown in Figure 2, the lining plate 2
The lower edge of the lining plate is integrally formed as a step-like thin piece 2b, and this piece is sandwiched between the upper back surface of the cutting edge 3 and the blade 1 to obtain mounting strength for the lower edge of the lining plate. This was also attempted.

However, in this case, the penetration angle of the edge 3 changes by the thickness of the thin piece portion 2b, which significantly reduces the penetration force into the soil and the soil rolling performance. I haven't reached it yet. In addition, the earthmoving machine tool of Utility Model Application Publication No. 52-81701 discloses a structure in which a thin plate is interposed between the cutting edge and the bucket main body, and the three parts are fastened together with bolts, but the thin plate is made of an elastic material. Therefore, when the bolts are secured by tightening bolts, there is a risk that the tightened portions may be damaged or the bolts may easily loosen, especially during heavy-load excavation work.

This idea was made in view of the above circumstances, and its main purpose is to sandwich the lower edge of the lining plate between the main body of an attachment such as a blade or bucket and the cutting edge.
At the same time, stable attachment strength of the plate is obtained,
To provide a lining attachment for earthwork work in which an edge penetration angle is always maintained correctly.

Another object of this invention is to provide a lining attachment for earthwork work that does not require a separate spacer to maintain an appropriate edge penetration angle, and that maintains the appropriate penetration angle naturally and reliably. is to provide.

Another purpose of this invention is to significantly improve the durability of the lining plate so that its performance characteristics can be exhibited ideally at all times. To provide lining attachment. In order to achieve the above-mentioned problems, this invention has the following features: (a) A spacer protrusion extending in the longitudinal direction is provided on the back surface of the center portion of the cutting edge in which a penetrating bolt hole is provided; (b) A thin piece is integrally formed on the lower edge of the lining plate, and the thin piece is set to have approximately the same thickness as the spacer protrusion, so that the cutting edge is fixed to the attachment body. (c) When the cutting edge is bolted to the attachment body, the cutting edge should fit into the upper groove formed by the surface of the attachment body and the spacer projection of the cutting edge almost immediately. When the bolt is tightened, the thin piece of the lining plate immediately collides with the upper back surface of the cutting edge and the surface of the attachment body, and is held under pressure in the front-rear direction. A technical measure is taken in which the mutual surfaces of the cutting edge and the lining plate are set to be substantially flush.

As a result, the lining plate is held by the clamping force between the cutting edge and the attachment body without being tightened with bolts, so that it can be reliably attached to the attachment body without damaging the fixing force of the cutting edge. Furthermore, even when used in reverse, there is no risk of it coming off because the contact area with the cutting edge is large.

Hereinafter, a preferred embodiment of this invention will be described based on the drawings from FIG. 8 onwards.

Reference numeral 10 in FIG. 3 is a blade exemplified as an attachment body for earthwork work.

The blade 10 includes a mold board 11 and a reinforcing aggregate 12 integrally connected to the back surface of the mold board by welding or the like.
, a horizontally long upper stay 13 that is integrally connected along the entire upper edge of the mold board 11 , and a cutting edge 14 that extends along the lower edge of the mold board 11 .
and end bits 15 arranged at both ends thereof.

In this blade 10, the mold board 11 has bolt holes 16 to 18 arranged in rows at regular intervals in the vertical direction on both sides and the center, and the upper stay 13 has bolt holes 16 to 18 arranged in rows at regular intervals in the vertical direction. A plurality of bolt holes 19 are arranged in a row at regular intervals in the longitudinal direction.
are worn on each. Further, the reinforcing aggregate 12 is provided with bolt holes 20 to 22 (see FIG. 4) that face the bolt holes 16 to 18 of the mold board 11.

Cutting edge 14 and end bit 15
As shown in more detail in FIGS. 4 and 6, each has sharp edge portions 1 formed on both upper and lower edges
4a, 14b and 15a, 15b, and a spacer protrusion 25 integrally formed along the longitudinal direction at the center of each back surface.

The cutting edge 14 and the end bit 15 are integrally formed with a substantially horizontally convex cross section, and are molded by a bolt 23 passing through each spacer protrusion 25 and a nut 24 screwed into the bolt 23. It is removably fastened to the lower edge side of the board 11.

A lining plate 27 for covering the entire surface of the mold board 11, the so-called blade surface.
is a horizontally elongated stepped portion 2 that is depressed along the upper edge.
8, and vertical step portions 29, 30, and 31 formed by depressions in the vertical direction at both ends and the center portion, respectively.
It has The upper ends of each of the vertical step portions 29 to 31 are connected to the horizontally elongated step portion 28, and the lower ends thereof are interrupted at a midway point in the longitudinal direction of the lining plate 27. The reason for this is to maintain the strength of the lining plate itself as much as possible.

The horizontally elongated step portion 28 has a bolt hole 32 as a screw insertion hole for matching and aligning with the bolt hole 19 of the stay 13, and each of the vertical step portions 29 to 31 has a bolt hole 16 of the mold board 11.
-18 are provided with bolt holes 33-35 as screw insertion holes, respectively.

The lower edge side of the lining plate 27 is
It is formed as a stepped thin piece portion 27a to be inserted between the mold board 11, the cutting edge 14, and the end bit 15.

In the related configuration of the lining plate 27, the cutting edge 14, and the end bit 15, the thickness of the thin piece portion 27a and the protruding thickness of the spacer protrusion portion 25 are formed to be approximately the same, and the thin piece portion 27a is , is set to have a length extending to a position above the spacer protrusion 25 between the upper rear surface of the cutting edge 14 and the end bit 15 and the mold board 11.

Further, the cutting edge 14 and the end bit 15 are formed so that the maximum thickness thereof including the spacer protrusion 25 is approximately the same as the thick portion of the lining plate 27. Therefore, those edges 14 and end bits 15 are attached to the mold board 11.
When attached to the lining plate 27, each surface is maintained to be substantially flush with the thick wall surface of the lining plate 27.

Further, the lining plate 27 is integrally formed of a resin material mainly made of ultra-high molecular weight polyethylene, which has low friction and low adhesion to earth and sand. Therefore, the surface becomes paraffin-like and has excellent water repellency and durability.

In the lining plate 27, an upper holding plate 37 of the same length is fitted into the upper horizontally elongated stepped portion 28, and vertical holding plates 38 to 40 are fitted and aligned into each of the vertical stepped portions 29 to 31. It's becoming like that.

Each presser plate 37-40 has stepped portions 28-3.
The bolt hole 4 is set to have the same plate thickness as the depth of 0, and serves as a screw insertion hole portion for matching and aligning with the bolt holes 32 to 35 when fitting into the stepped portion.
1 to 44, respectively.

The bolt holes 41 of the upper holding plate 37 are shown in FIGS. 8 and 4, and the vertical holding plates 38 to 4 are shown in FIGS.
As shown in more detail in FIG. 5, the bolt holes 42 to 44 shown in FIG.
4' is a concentric step-shaped shaft hole formed with a larger diameter than the opening diameter on the back surface side.

Openings 4 on the front side of bolt holes 41 to 44 in the illustrated example
1' to 44' (hereinafter referred to as large diameter holes) are through bolts 45 that serve as screws for tightening the lining plate.
- 48 are counterbore formed in a tapered shape to accommodate and align the flat screw-shaped heads 45' to 48'.

On the other hand, the through bolts 45 to 48 have their respective heads 45' to 48', which are formed into flat screw shapes as described above, accommodated and aligned in the large diameter holes 41' to 44'. As clearly seen in FIGS. 8 and 5, grooves 51 for inserting a screw tightening tool such as a screwdriver are formed in 46' to 48'.

Thus, the lining plate 27 is attached to the blade 10 as follows.

First, attach the edge 14 and end bit 15 to the lower edge side of the mold board 11 with bolts and nuts 2.
3 and 24, the edge 14
And a thin piece 2 at the bottom of the lining plate 27 between the end bit 15 and the mold board 11.
7a is intervened, and the piece is abutted against and supported on the upper surface of the spacer protrusion 25.

Then, each bolt hole 32 to 35 of the lining plate 27 is connected to the mold board 11 and the stay 1.
3 bolt holes 16 to 18 and 19.

Next, each stepped portion 28 of the lining plate
31 to fit and align the respective holding plates 37 to 40.

Therefore, the bolt holes 41 to 44 of the holding plates 37 to 40, the lining plate 27, the mold board 11, the stay 13, and the reinforcing aggregate 12 are
and 32-35, and 16-18, 19,20-
22, presser plates 37 to 4
Insert the through bolts 45 to 48 from the surface side of 0.

Then, by screwing and tightening the nuts 45a to 48a to the tips of the bolts 45 to 48,
Tighten the upper edge, both sides and center of the lining plate 27.

At the same time, by fully tightening the bolts and nuts 23 and 24 for tightening the edge 14 and the end bit 15, the thin piece portion 27a of the lining plate 27 is tightened together.

In this case, the thin piece portion 27a is held between each of the edge 14 and the end bit 15 and the mold board 11, thereby being maintained in a securely tightened state.

Further, the edge 14 and the end bit 15 are connected to a spacer protrusion 25 having approximately the same thickness as the thin piece portion 27a.
Since they are fastened to the mold board 11 via the mold board 11, the correct penetration angle matching the front curvature of the board is maintained.

Therefore, the lining blade with the above configuration, which is installed on an earthmoving vehicle via a push arm, a lift cylinder, a tilt cylinder, etc., allows the edges 14 and end bits 15 to penetrate correctly and smoothly into earth and sand during dozing work, etc., and the lining plate 27 exhibits ideal soil rolling and soil removal performance, greatly increasing work efficiency.

Moreover, since the lining plate 27 is reliably and firmly attached as described above, the mold board 11
There is no fear that excavated soil or the like will enter between the parts or the parts will come off as a result of this. In addition, each holding plate 37 to 40 and each through bolt head 45' to
Since the surfaces of the lining plate 48', the edge 14, and the end bit 15 are maintained on the same plane, the performance characteristics of the lining plate can be fully utilized.

Furthermore, the edge 14 and the end bit 15 are
When the respective downward edges 14b and 15b are worn to their limits, the unused upward edges 14a and 15a are reversed and used.

After the reversal, as shown in FIG. 7, supplementary members 52 and 53 are additionally attached integrally to the upper ends of the edge 14 and the end bit 15 by means of welding or the like to compensate for wear.

Thereby, the thin piece portion 27a of the lining plate is maintained in the same tightened state as before the edge 14 and end bit 15 were reversed.

Therefore, the lining plate 27
4 and the end bit 15 are always maintained in a stable, reliable and firm attached state regardless of whether they are before or after being reversed.

The lining plate 27 may be divided into a plurality of parts at regular intervals in the width direction.

In this case, as shown in FIG.
9 is formed, and the strip plate 50 is fitted into the groove, aligned, and removably fastened with bolts or the like. The strip plate 50
This prevents earth and sand from entering between the joints of the divided plates 27A and 27B.

In the case of such divided plates 27A and 27B, there is an advantage that in the event of breakage or the like, only the plate at that location can be partially replaced.

On the other hand, the screws for tightening the lining plate are not limited to the through bolts 45 to 48 as described above,
For example, flat screws 45 to 48 as shown in FIG. All you have to do is match.

Further, in the above embodiment, the lining plates 27 to 27A, 27 are provided on the front surface of the mold board 11.
Although only the so-called lining blade coated with B has been described, this invention may be one in which a bucket for loading work is used as the attachment main body, and a lining plate is attached to the wall surface of the main body in the same manner. In this case as well, the same effects as in the previous embodiment can be obtained.

Furthermore, it is preferable that the through bolts or flat screws 45 to 48 be high-tensile hardened bolts, thereby further improving the strength of attachment of the lining plate.

As described above, in this invention, the step-shaped thin piece integrally formed on the lower edge side of the lining plate that covers the earth-contacting surface of the earthwork attachment body is connected to the main body by the upper piece of the cutting edge. Since a protrusion for a spacer having approximately the same thickness as the thin piece is integrally formed along the longitudinal direction at the center of the back surface of the cutting edge, various excellent effects can be obtained as follows. It will be done.

(i) The cutting edge provides stable attachment strength for the lining plate.

(ii) In particular, proper maintenance of the edge penetration angle is naturally and reliably achieved without requiring a separate spacer for maintaining the proper edge penetration angle.

Therefore, the edge penetration angle does not change due to the cutting edge pinching the lower edge of the lining plate, and it is possible to ensure smooth edge penetration into soil etc. during earthwork work.

(iii) Even when the cutting edge is worn out, reversal can be performed smoothly without any problem.

[Brief explanation of the drawing]

1 and 2 are cross-sectional views showing the related structures of a lining plate and a cutting edge according to different conventional examples, and FIG. 3 is an exploded perspective view of a lining blade according to a preferred embodiment of this invention, and FIG. Fig. 4 is an exploded longitudinal side view, Fig. 5 is an enlarged sectional view of the lining plate fastening part, Fig. 6 is an enlarged sectional view of the main part, and Fig. 7 is an enlarged sectional view of the cutting edge attachment part after the cutting edge has been reversed. 8 and 9 are cross-sectional views showing different embodiments of this invention. 10 is a blade illustrated as an attachment body, 14 is a cutting edge, 25 is a spacer, 27 is a lining plate, and 27a is a thin piece.

Claims (1)

[Claims for Utility Model Registration] A lining for earthwork work such as a blade or bucket, comprising an attachment body having a reversible cutting edge at the lower end, and a lining plate covering the earth-contacting surface of the attachment body. In the attachment, the cutting edge has a projecting part for a spacer extending in the longitudinal direction on the back side of the central part where a penetrating bolt hole is arranged, and the lining plate is integrated with the lower edge. formed and set to approximately the same thickness as the above-mentioned spacer protrusion,
It has a thin piece that is almost immediately fitted into the upper groove formed by the surface of the attachment body and the spacer protrusion of the cutting edge when the cutting edge is fixed to the attachment body. , When the cutting edge is bolted to the attachment body, the thin piece of the lining plate will immediately collide with the upper back surface of the cutting edge and the surface of the attachment body due to the fixing force caused by the bolt tightening. A lining attachment for earthwork work, characterized in that the cutting edge and the lining plate are held under pressure in the front-rear direction, and the mutual surfaces of the cutting edge and the lining plate are substantially flush.