JP2001271373A - Blade device of civil engineering vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blade device of a civil engineering vehicle facilitating the return to a fixed state without generating a separated piece like a tension bolt making a support of a cutting edge mounted to a blade body in a turnable manner as a means for stopping the turning to fix it to the blade body until specific turning force is added thereto. SOLUTION: The blade device of the civil engineering vehicle is equipped with a lock device (18) for fixing the support (8) until specific turning force (F) for fixing the support (8) until specific turning force is added to the blade body (10), and the lock device (18) is equipped with a support side lock member (20), a body side lock member (22) engaged with the lock member in a separable manner and an energizing device (24) energized to a direction for holding its engaged state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blade device for an earth-moving vehicle, and more particularly, to a method of reversing a cutting edge when an impact force applied to the cutting edge, which is a cutting blade provided in the blade device, exceeds a predetermined magnitude. The present invention relates to a blade device for an earthmoving vehicle provided with a blade device and means for buffering an impact applied to the earthmoving vehicle.

[0002]

2. Description of the Related Art Japanese Patent Publication No. Sho 63-31604 discloses a blade device of an earthmoving vehicle provided with a shock absorbing means.
Referring to FIG. 8, a support 52 to which a cutting edge 50 is attached is attached to a lower end portion of a blade body 54 via a connecting member 56 so as to be pivotable about a connecting pin 58 and a connecting rod 60. Have been. The upper end of the support 52 is the blade body 5
4 is fixed to the blade main body 54 by a tension bolt 62 passed through the through hole 54a, and the rotation is stopped.

Referring to FIG. 9 together with FIG. 8,
When the cutting edge 50 of the support 52 collides with an obstacle 64 when working with an earth-moving vehicle equipped with the blade device, the support 52
Is exerted on the blade body 54 by an impact force indicated by an arrow F. When the force exceeds a predetermined value, the tension bolt 62 for stopping the rotation of the support 52 is cut off and separated from the V-shaped groove provided on the shaft portion by the tensile force. When the tension bolt 62 is cut, the support 52 becomes pivotable with respect to the blade main body 54, and from the state shown in FIG. 8, the upper end shown by a solid line in FIG.
The upper end shown by the two-dot chain line is further away from the blade body 54 and is inverted.

[0004] With an earth-moving vehicle equipped with this blade device, for example, when performing snow removal work, the cutting edge 5 is used.
When the vehicle hits an obstacle such as a curb, a utility pole, a large stone on the road surface, or a manhole cover, the energy of the impact is absorbed by cutting and separating the tension bolt, and the blade device, the earthwork vehicle body The shock applied to the like is buffered. In addition, cutting edge 5
The reversal of the 0 and the support 52 avoids further collisions with obstacles 64 such as manhole covers.

[0005]

The conventional blade device for an earthmoving vehicle having the above-described configuration has the following problems to be solved.

(1) Separation piece of tension bolt: For example, in snow removal work which is one of the typical applications of the blade device, the cut piece of the tension bolt is cut into a rotating part of a blower, an auger or the like of a snow removal machine. If mixed, the rotating parts may be damaged. Also, besides snow removal work, uniform sand, gravel,
If the separated pieces are mixed into the processed material in the collection work at the stock yard such as salt and grain, a special operation for extracting the separated pieces, special equipment, and the like are required.

(2) Returning work: In order to return the support of the cutting edge, which has become rotatable due to the cutting of the tension bolt, to return to the original state, the support is rotated with respect to the blade body to return to the original position, and the new tension is applied. Re-fix to the blade body using bolts. For that purpose, the tension bolts must always be prepared and stored.
Furthermore, since snow, earth and sand, etc. adhere to the mounting portions and mounting holes for the tension bolts of the blade device, it is necessary to remove them when returning to work. The time for stopping the vehicle is further increased.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and a technical problem of the present invention is to provide a cutting edge support rotatably attached to a blade body, and to stop the rotation of the blade body until a predetermined turning force is applied. As a means for fixing, a blade device for an earth-moving vehicle, which does not generate a separation piece like a tension bolt when the fixing is released, and can easily return to the original fixed state. It is to provide.

[0009]

According to the present invention, there is provided a blade device of an earthmoving vehicle for solving the above technical problems.
A blade body mounted on an earthmoving vehicle, a support pivotally mounted on the blade body and having a cutting edge mounted thereon, and a locking means for stopping and fixing the support until a predetermined turning force is applied to the support on the blade body. Wherein the locking means comprises a support side lock member provided on the support, a main body side lock member provided on the blade main body and removably engaged with the support side lock member, and a main body side lock member provided on the support side. A biasing means for biasing the lock member in a direction for maintaining the engagement state, the blade device for an earthmoving vehicle being provided.

The blade device for an earthmoving vehicle according to the present invention includes a support-side lock member and a main-body-side lock member which is urged by the lock member and removably engages with the support to fix the support to the blade body. I did it.
Therefore, it is not necessary to prepare a new member such as a tension bolt for generating a separation piece such as a tension bolt and for returning from a released state to an original fixed state by a detachable structure.

In a preferred embodiment, each of the support side lock member and the main body side lock member has an engagement portion which engages with each other, and each of the engagement portions is provided between the main body side lock member and the support side lock member. By pivoting the support in the disengaged state with respect to the blade body,
It is formed so as to be able to return to the original engagement state.

Then, the support side locking member and the main body side locking member are releasably engaged with the engagement portions formed on each of them.

In a preferred embodiment, the biasing means is built in the blade body. The main body side locking member is swingably attached to the blade main body.

The urging means is protected from snow, earth and sand, foreign matter and the like. In addition, the biasing force is prevented from becoming unstable due to these effects, and the locking means is operated properly. Further, the main body side locking member can be freely swung by a member such as a lever, so that the locking member and the urging means can be freely arranged, and a large urging force is applied to the engaging part by a small force of the urging means by the principle of leverage. So that it can be granted.

In a preferred embodiment, the biasing means includes a fixing flange attached to the blade body, and one end connected to the main body side locking member outside the blade body and the other end passing through the fixing flange. , A movable flange attached to the other end of the rod member, and a compression coil spring interposed between the fixed flange and the movable flange. The movable flange is attached so that the position of the rod member in the axial direction can be adjusted.

Then, the force of the compression coil spring is applied to the main body side locking member via the rod member. Further, the biasing force can be adjusted by changing the mounting position of the movable flange.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a blade device for an earthmoving vehicle constructed in accordance with the present invention will be described below in more detail with reference to the accompanying drawings.

Referring to FIG.
Is attached to the tip of a lift arm 4a provided on the body of the wheel loader 4 so as to be vertically swingable, for example, in a wheel loader 4, which is a typical earth-moving vehicle. The wheel loader 4 is moved in the forward direction indicated by the arrow X, the lift arm 4a is moved up and down, the blade device 2 is positioned at an arbitrary height with respect to the road surface E, and operations such as snow removal on the road surface E can be performed. Done.

Referring to FIGS. 2 and 3 together with FIG. 1, the lower end of the blade body 10 of the blade device 2 is substantially the same as that disclosed in the above-mentioned JP-B-63-31604. By the same mounting mechanism 3, the cutting edge 6 which is a cutting blade extending in the width direction of the blade device 2 (the direction perpendicular to the paper surface in FIG. 1) and the support 8 to which the cutting edge 6 is mounted are connected to the blade body 10 by the connecting member 1.
2, it is attached so as to be pivotable about the connection pin 14 and the connection rod 16. Cutting edge 6
The supports 8 are arranged in plural groups in the width direction of the blade main body 10 in accordance with the type and form of the earth-moving vehicle. Since the mounting mechanism 3 is well known, a detailed description is omitted.

Referring to FIG. 4 together with FIG. 2,
The blade device 2 includes locking means 18 for stopping the rotation of the support 8 and fixing the support 8 to the blade body 10 until a predetermined rotation force is applied to the support 8. The locking means 18
A support-side lock member 20 provided on the support 8,
The support side locking member 20 provided on the blade body 10
And a biasing means 24 for biasing the main body side lock member 22 in a direction to maintain the main body side lock member 22 engaged with the support side lock member 20. Support side lock member 20 and main body side lock member 2
Each of the two is provided with an engaging portion 26 that engages with each other. The locking means 18 is installed in the width direction of the blade device 2 between the pair of mounting mechanisms 3 of the support 8 (FIG. 2).

Referring to FIGS. 5 and 6 together with FIGS. 2 and 4, the support-side locking member 20 is formed by molding a thick steel plate having a thickness W (FIG. 5).
Is fixed integrally and erected on the back surface opposite to the mounting surface of the cutting edge 6 by means such as welding.
On the upper surface from the end to the tip of the lock member 20 joined to the support 8, an arc-shaped concave portion 20 a as an engaging portion 26 for engaging with the main body side lock member 22 and a convex portion 20 b subsequent thereto are formed. ing.

The main body side lock member 22 is formed in a lever shape formed of a thick steel plate having substantially the same thickness W (FIG. 5) as the support side lock member 20. An engaging portion 26 for engaging with the support side locking member 20 is formed at one end of the lever-like longitudinal direction, and an elastic urging means 24 is rotatably connected to the other end by a pin member 28. In the vicinity of the engaging portion 26 between the bearing hole and the engaging portion 26, a plate member 10 a disposed substantially horizontally and integrally with the lower end of the blade body 10 is formed. It is rotatably attached to a bracket 10b provided by a pin by a pin member 30. Engaging part 2 of main body side locking member 22
6 is a recess 20 formed in the support side locking member 20.
a and the convex portion 20b are formed in substantially the same shape, and in the engaged state (the state shown in FIG. 4), the main body side locking member 2 is formed.
The second convex portion 22a is the concave portion 20 of the support side locking member 20.
a, the concave portion 22b is provided with the convex portion 2 of the support side locking member 20.
0b.

The engaging portion 26 is configured to pivot the support 8 in a state where the engagement between the main body side locking member 22 and the support side locking member 20 is released with respect to the blade main body 10 so that the original engaging state is achieved. (The release and return of the engaged state will be described later in detail).

A circular opening 11 for accommodating the urging means 24 in the blade body 10 is formed in the plate member 10a below the blade body 10. Around the opening 11, a screw hole 11a (6
Are formed (FIG. 6).

The urging means 24 includes a fixing flange 32 attached to the lower surface of the opening 11 of the plate member 10a of the blade body 10, and a main body side locking member at one end outside the blade body 10 below the plate member 10a. 22 is rotatably connected by a pin member 28 and the other end is fixed flange 3
A rod member 34 protruding upward through the through hole 32a formed in the blade body 10 into the blade body 10;
Flange 36 attached to the other end by a double nut 42, fixed flange 32 and movable flange 36
And a compression coil spring 38 interposed therebetween.

The rod member 34 is connected to the main body side locking member 22.
And a rod 34b integrally attached to the base end of the yoke 34a, and a male screw 34c is formed at the distal end of the rod 34b. ing. The movable flange 36 is
The through hole of the rod 34 is formed in the center of the disk. The fixing flange 32 is provided with the above-described plate member 10a.
Is attached to the screw hole 11a on the lower surface of the base member by a bolt 40. The outer diameters of the movable flange 36 and the compression coil spring 38 are formed to have substantially the same size as the opening 11 that can pass through the opening 11.

The urging means 24 is pre-assembled before being attached to the blade main body 10 and the main body side lock member 22. That is, the fixed flange 32, the compression coil spring 38, and the movable flange 3 are attached to the rod 34b of the rod member 34.
6 in sequence, and the male screw 34c at the tip of the rod 34b
And a double nut 42 is attached to it. The fixed flange 32 abuts on the base of the yoke 34 a of the rod member 34 by the spring force of the compression coil spring 38. In this state, the distance between the fixed flange 32 and the movable flange 36 is set to a predetermined length L (FIG. 4), and the position of the movable flange 36 is adjusted and fixed by the double nut 42 by adjusting the axial position of the rod member 34. The spring force of the compression coil spring 38 is set to a predetermined value. For adjustment and fixing by the double nut 42, first, the position of the movable flange 36 is determined by the nut 42a on one movable flange side, and then the other nut 42b is brought into contact with the nut 42a to be tightened and locked.

The urging means 24 assembled as described above
Is inserted into the blade body 10 from below the plate member 10a of the blade body 10 through the opening 11 from the distal end side of the rod member 34, and the fixing flange 32 is attached to the plate member 10a.
a is attached as described above.

The magnitude of the spring force of the compression coil spring 38, which is set by the length L, ie, the magnitude of the urging force, is determined according to the collision energy expected when the earthmoving vehicle collides with an obstacle. Since the energy of this collision is dynamic, it differs depending on the type and form of the earth-moving vehicle and the working device, and on the running speed of the work, the mass of the earth-moving vehicle and the working device, and the like. Therefore, for example, when a light-weight earth-moving vehicle with a small mass works at high speed, the spring force is set small so as to minimize the impact due to the collision. Set larger.

The blade body 10 is further provided with a biasing means 24 for applying the spring force of the built-in biasing means 24 to the blade body 1.
The adjustment window 1 provided with an openable / closable cover 44 so that adjustment can be performed without removing the adjustment window 1 from the opening.
0c is formed. Through the adjusting window 10c, the double nut 42 of the urging means 24 is loosened, and the movable flange 3
The mounting position of 6 is adjusted to adjust the length L for setting the spring force, and the double nut 42 is tightened to fix the position.

The operation of the blade device 2 of the earthmoving vehicle as described above will be described with reference to FIG. 7 together with FIG.

(1) Fixing of the blade body and the support: As shown in FIG. 4, the support 8 of the cutting edge 6 and the blade body 10 have a predetermined impact force, which is a turning force indicated by an arrow F, applied to the support 8. Until the size becomes large, the engaging portions 26 of the support-side lock member 20 and the main-body-side lock member 22 are urged by the urging force of the urging means 24 to maintain the engaged state, and the pivoting of the support 8 is stopped. Is fixed.

(2) Engagement and disengagement of the blade body and the support: When the earth-moving vehicle is equipped with the blade device 2 in this state and is running in the direction indicated by the arrow X, for example, for snow removal,
When the cutting edge 6 collides with an obstacle 46 such as a manhole on the road surface E, if the impact force becomes larger than a predetermined value, as shown by a solid line in FIG. 22, the yoke 34a of the rod member 34 of the urging means 24 is pulled down by overcoming the set force of the spring 38, and the main body lock engaged with the support side lock member 20 is pressed. The convex portion 22a of the member 22 crosses over the convex portion 20b from the concave portion 20a of the support-side lock member 20 and is disengaged. When the blade device 2 further moves in the direction of the arrow X, the lower ends of the cutting edge 6 and the support 8 are reversed backward in the traveling direction X as shown by the two-dot chain line, and the obstacle 46 is avoided.

(3) Returning the detached support to the original state: The support 8 (the state shown by the two-dot chain line in FIG. 7) which has been separated from the blade body 10 and returned to the original state (the state shown in FIG. 4). 7, the operator moves the earth-moving vehicle in the direction opposite to the arrow X, hooks the cutting edge 6 on the road surface E or an appropriate means, and changes the state shown by the two-dot chain line in FIG. The projection 20b of the support side locking member 20 is brought into contact with the projection 20b. And
The blade device 2 is pressed against the road surface E by moving its own weight or the lift arm 4a shown in FIG. 1 in the downward direction, and the engagement portions 26 of the main body side lock member 22 and the support side lock member 20 are brought into the engaged state.

(4) No separation piece is generated: As described above, release of the fixing between the support 8 of the cutting edge 6 and the blade main body 10 in the blade device 2 is performed by the engagement between the main body side lock member 22 and the support side lock member 20. Since the engagement is performed by releasing the engagement of the joint portion 26, there is no generation of a separation piece as in the conventional tension bolt. Therefore, it is possible to eliminate problems such as damage to rotating parts such as a blower and auger in snow removing work, and problems such as mixing of separated pieces in collecting sand such as uniform sand, gravel, salt, and grains.

(5) Easy return operation: To return the support 8 of the fixed cutting edge 6 and the blade main body 10 to the original fixed state as described above, it is necessary to return the support 8 to a conventional tension bolt as described above. There is no need to prepare and store parts. Further, cleaning of the locking means 18 is substantially unnecessary since there is no through hole for mounting the tension bolt. Further, the operator of the earthmoving vehicle can perform this return operation without getting off the driver's seat. Therefore, the return operation is easy, and the suspension of the earthmoving vehicle for the return operation can be significantly reduced or substantially eliminated.

(6) Built-in urging means: Since the urging means 24 is built into the blade main body 10, damage to the urging means 24 from foreign matters and rust caused by rainwater is prevented, and the life is greatly improved. In addition, since no foreign matter such as snow adheres, the biasing force can be made stable and highly reliable. Further, since the urging means 24 can be attached to the blade main body 10 in a sub-assembled state, setting and attaching of the urging force are easy.

(7) Oscillating type main body side locking member: The main body side locking member 22 is formed in a lever shape, and
0, the lever-like shape can be arbitrarily set to provide a degree of freedom in the arrangement position of the biasing means 24, and the engaging portion 26 required by the principle of leverage is provided.
, The spring force of the urging means 24 can be reduced by half, that is, the compression coil spring 38 can be reduced.

(8) Easy adjustment of the urging force: the urging force of the urging means 24 can be easily adjusted through the adjusting window 10c of the blade body 10, so that the blade device 2 can be easily adjusted.
, The holding force can be easily and arbitrarily adjusted as appropriate depending on the conditions of the work site, the traveling speed of the earthmoving vehicle, and the like.

(9) Therefore, according to the blade device 2 of the present invention, the operation of returning the support 8 of the inverted cutting edge 6 is easy, and the support 8 is fixed without preparing any component for the return. Can be adjusted freely according to the work, and if the impact due to collision with an obstacle is large, the force for fixing the support 8 is reduced to prevent damage to the earth-moving vehicle. When the frequency of reversal of 8 is high, the force can be easily increased.

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, and can be variously modified or modified within the scope of the present invention. It is.

For example, in the embodiment of the present invention,
The main body side locking member 22 is swingably attached to the blade main body 10, and is urged by the urging means 24 to the support side locking member 20. The engagement portion of the main body side locking member may be directly formed.

[0043]

According to the blade device for an earthmoving vehicle constructed in accordance with the present invention, the support of the cutting edge pivotally mounted on the blade body is stopped and fixed to the blade body until a predetermined turning force is applied. As a means, there is provided a blade device for an earthmoving vehicle, which does not generate a separation piece unlike a tension bolt when the fixing is released, and can easily return to an original fixed state. Is done.

[Brief description of the drawings]

FIG. 1 is a side view of a wheel loader which is a typical earth-moving vehicle including a blade device configured according to the present invention.

FIG. 2 is an enlarged view of a part of the bottom surface of the blade device viewed in the direction of arrows AA in FIG. 1;

3 is an enlarged sectional view of a part of an attachment mechanism for attaching a support of a cutting edge to a blade main body as viewed in a direction indicated by arrows BB in FIG. 2;

FIG. 4 is an enlarged sectional view of a part of a locking means of a blade main body and a support of a cutting edge as viewed in a direction indicated by arrows CC in FIG. 2;

FIG. 5 is a cross-sectional view as seen in the direction of the arrow DD in FIG. 4;

FIG. 6 is a sectional view as seen in the direction of arrows EE in FIG. 5;

FIG. 7 is an explanatory view of the operation of the lock means shown in FIG.

FIG. 8 is a partial sectional view of a conventional blade device.

FIG. 9 is an explanatory view of the operation of the blade device shown in FIG.

[Explanation of symbols]

 2: blade device 4: wheel loader (earthwork vehicle) 6: cutting edge 8: support 10: blade body 18: locking means 20: support side locking member 22: main body side locking member 24: urging means 26: engagement part 32 : Fixed flange 34: rod member 36: movable flange 38: compression coil spring 50: cutting edge 52: support 54: blade body 62: tension bolt

Claims (6)

[Claims] 1. A blade body mounted on an earthmoving vehicle,
A support pivotally mounted on the blade body and having a cutting edge mounted thereon; and a lock means for stopping and fixing the support to the blade body until a predetermined pivoting force is applied to the support. A support-side lock member provided on the support, a body-side lock member provided on the blade body and removably engaged with the support-side lock member, and a direction in which the body-side lock member is held in an engaged state with the support-side lock member. And a biasing means for biasing the earthwork vehicle. 2. The support-side lock member and the main-body-side lock member each include an engagement portion that engages with each other, and each of the engagement portions releases the engagement between the main-body-side lock member and the support-side lock member. The blade device for an earthmoving vehicle according to claim 1, wherein the support in the set state is formed so as to be able to return to the original engaged state by pivoting with respect to the blade body. 3. The blade device for an earthmoving vehicle according to claim 1, wherein the biasing means is built in the blade body. 4. The blade device for an earthmoving vehicle according to claim 1, wherein the body-side lock member is swingably attached to the blade body. 5. The biasing means includes a fixed flange attached to the blade main body, one end connected to the main body side locking member outside the blade main body, and the other end penetrating the fixed flange toward the inside of the blade main body. The rod member according to any one of claims 1 to 4, further comprising a projecting rod member, a movable flange attached to the other end of the rod member, and a compression coil spring interposed between the fixed flange and the movable flange. Blade equipment for earthmoving vehicles. 6. The blade device for an earthmoving vehicle according to claim 5, wherein the movable flange is mounted so as to adjust the position of the rod member in the axial direction.