JP7033566B2 - Soil removal equipment for construction machinery - Google Patents

Description

The present invention relates to an earth removal device for a construction machine mounted on a construction machine such as a hydraulic excavator and used for leveling work.

In general, hydraulic excavators, which are typical examples of construction machinery, include a crawler-type lower traveling body that can self-propell in the forward and backward directions, and an upper turning body that is mounted on the lower traveling body so as to be able to turn via a turning device. It is equipped with. On the front side of the upper swivel body, a work device for excavating earth and sand is provided. In addition, a soil removal plate (blade) is provided on the front side of the lower traveling body via an elevating arm, and the soil removal plate is used for soil removal work such as earth and sand, and leveling of the ground such as land for construction and roads. Work and the like are performed (see Patent Document 1).

Japanese Unexamined Patent Publication No. 2010-05987

By the way, the earth-removing plate according to the prior art consists of a plate body extending in the left and right directions, and is attached to the elevating arm and the cutting edge (cutting edge) attached to the front surface of the earth-removing plate body to flatten the ground. It is composed of a blade). The soil removal plate according to the prior art is composed of one surface that is smoothly continuous from the lower end of the cutting edge to the upper end of the soil removal plate main body. For this reason, when the hydraulic excavator is run with the lower end of the cutting edge grounded during the ground leveling work, the earth and sand extruded by the earth removal plate accumulates in front of the earth removal plate.

If soil accumulates in front of the soil removal plate during leveling work, a work device is used to level the accumulated soil. Specifically, by extending the work equipment forward and arranging the excavation bucket on the front side of the soil removal plate, and turning the upper swivel body to move the bucket to the left and right in front of the soil removal plate. , The earth and sand accumulated in front of the excavation board can be scattered (leveled) in a plane.

However, it is difficult for the operator sitting in the driver's seat to visually check (confirm) the earth and sand accumulated in front of the soil removal plate because the field of view is obstructed by the soil removal plate. For this reason, by the time the earth and sand accumulated in front of the earth removal plate gets over the upper end of the earth removal plate and overflows to the rear, a large amount of earth and sand is accumulated in front of the earth removal plate. As a result, a large amount of time is required for the leveling work using the work device, and there is a problem that the workability at the time of leveling work is deteriorated.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide an earth removal device for a construction machine capable of improving the workability of leveling work.

In order to solve the above-mentioned problems, the present invention comprises an elevating arm having one end rotatably attached to a vehicle body capable of self-propelling in the front and rear directions, and an earth removal plate attached to the other end of the elevating arm. The earth-removing plate is composed of a plate body extending in the left and right directions, and has an earth-removing plate main body attached to the other end of the elevating arm and a lower end portion protruding downward from the lower end of the earth-removing plate main body. In a construction machine earth removal device, the earth removal device is provided with a cutting edge having an upper end portion located below the upper end of the earth removal plate main body while being attached to the front surface of the earth removal plate main body. , A gap is formed between the fixed portion fixed to the soil removal plate main body and the side end portion of the fixed portion, which projects forward from the front surface of the soil removal plate main body and forms a gap between the soil removal plate main body. It is characterized by having an overhanging part.

According to the present invention, a part of the earth and sand accumulated in front of the soil removal plate during the leveling work falls over the upper end of the overhanging portion of the cutting edge and falls into the gap between the soil removal plate main body and the overhanging portion. do. The earth and sand that has fallen into the gap is discharged to the rear surface side of the earth removal plate main body through between the lower end of the earth removal plate main body and the ground. Therefore, the operator determines that the soil has accumulated in front of the soil removal plate by visually observing the soil discharged to the rear surface side of the soil removal plate main body, and appropriately leveles the soil accumulated by the ground leveling work. While doing so, the ground leveling work can be performed and the workability can be improved.

It is a left side view which shows the hydraulic excavator provided with the earth removal apparatus by embodiment of this invention. It is a top view of a hydraulic excavator. It is a perspective view which looked at the lower traveling body of a hydraulic excavator, the earth removal device, etc. from the left front with the upper swivel body removed. It is a top view which shows the earth removal device, the lower traveling body, etc. in FIG. It is sectional drawing which looked at the earth removal plate from the arrow VV direction in FIG. It is sectional drawing seen from the same position as FIG.

Hereinafter, the case where the earth removal device of the construction machine according to the embodiment of the present invention is applied to a hydraulic excavator will be described in detail according to the attached drawings. In this embodiment, the directions in which the lower traveling body travels are defined as the front and rear directions, and the horizontal directions orthogonal to the front and rear directions are defined as the left and right directions, and the configuration and arrangement of each device and member will be described. ..

In FIGS. 1 and 2, the hydraulic excavator 1 has a crawler-type lower traveling body 2 capable of self-propelling in the front and rear directions, and an upper turning body rotatably mounted on the lower traveling body 2 via a turning device 3. It has a body 4. A swing-type work device 5 for excavating earth and sand is provided on the front side of the upper swivel body 4. In this case, the lower traveling body 2 and the upper turning body 4 constitute the vehicle body of the hydraulic excavator 1.

Here, the lower traveling body 2 includes a track frame 2A as a base, and the track frame 2A is a pair of left and right side frames 2B extending in the front and rear directions, and a right side frame 2C (FIG. 3). A floating wheel 2D is provided on one side in the front and rear directions of the left side frame 2B and the right side frame 2C, and a drive wheel 2E is provided on the other side in the front and rear directions. The track 2F is wound around the idle wheel 2D and the drive wheel 2E, and the lower traveling body 2 travels by driving the track 2F by the drive wheel 2E. Further, the track frame 2A of the lower traveling body 2 is provided with a soil removal device 17, which will be described later.

The upper swivel body 4 is mounted on the track frame 2A of the lower traveling body 2 so as to be swivelable via the swivel device 3. The upper swivel body 4 includes a swivel frame 6, a counterweight 7, an engine 8, a driver's seat 9, a canopy 15, an exterior cover 16, and the like, which will be described later.

The work device 5 is attached to a swing post 5A swingably attached to the front end of the swivel frame 6 in the left and right directions, a boom 5B mounted to the swing post 5A so as to be able to move up and down, and a tip of the boom 5B. It includes an arm 5C rotatably attached, a bucket 5D rotatably attached to the tip of the arm 5C, a boom cylinder 5E, an arm cylinder 5F, and a bucket cylinder 5G. Further, a swing cylinder 5H for swinging the swing post 5A to the left and right is provided between the swing frame 6 and the swing post 5A (see FIG. 2).

The swivel frame 6 is a base of the upper swivel body 4, and is mounted on the track frame 2A via the swivel device 3. A support bracket 6A projecting forward is provided on the front side of the swivel frame 6, and the swing post 5A of the working device 5 is supported by the support bracket 6A so as to be swingable in the left and right directions. A counterweight 7 is provided on the rear side of the swivel frame 6, and the counterweight 7 maintains a weight balance with the working device 5.

Here, the rear surface 7A of the counterweight 7 fits within the left and right vehicle width dimensions (distance between the left and right tracks 2F) of the lower traveling body 2 when the upper turning body 4 turns, and the upper turning body 4 It is possible to avoid interference with surrounding obstacles when turning (see FIG. 2). As a result, the hydraulic excavator 1 realizes a small rear turn of the upper swing body 4. It should be noted that the definition of a small rear turn includes a degree in which a part of the counterweight 7 slightly protrudes from the vehicle width dimension of the lower traveling body 2 within a range that does not cause a problem in work.

The engine 8 (see FIG. 1) as a prime mover is located on the front side of the counterweight 7 and mounted on the turning frame 6. The engine 8 drives a hydraulic pump (not shown) that supplies hydraulic oil to a hydraulic actuator mounted on the hydraulic excavator 1. As the prime mover, an electric motor or a hybrid type prime mover in which an engine and an electric motor are combined can be used.

The driver's seat 9 is located on the front side of the counterweight 7 and above the engine 8 and is provided on the turning frame 6. The driver's seat 9 is seated by an operator who operates the hydraulic excavator 1. Left and right operating levers 10 for operating the turning device 3, the working device 5, and the like are arranged on both the left and right sides of the driver's seat 9. Further, on the right side of the operation lever 10 on the right side, a blade operation lever (not shown) for operating the soil removal device 17 described later is arranged. Further, on the front side of the operation lever 10 on the right side, for example, a multi-monitor device 11 for displaying information such as an operating state, a setting, and a warning of the hydraulic excavator 1 to the operator is provided.

The floor member 12 constituting the floor portion of the upper swivel body 4 is provided on the front side of the driver's seat 9. The floor member 12 is made of a flat plate and forms a scaffolding for an operator seated in the driver's seat 9. The floor member 12 is provided with a pair of left and right traveling lever pedal devices 13. By manually operating or stepping on the left and right traveling lever pedal devices 13, the traveling operation of the lower traveling body 2 is controlled.

The handrail 14 is provided on the front side of the floor member 12, and rises upward from the floor member 12. The handrail 14 is located in front of the driver's seat 9 and extends in the left and right directions. For example, the handrail 14 can be gripped when the operator gets on and off between the ground and the floor member 12, or stands on the floor member 12. It is grasped when the raised operator looks into the excavated hole. The handrail 14 has left and right vertical bars 14A extending upward and downward by bending one bar such as a pipe material, and the upper ends of these left and right vertical bars 14A. It is formed in an inverted U-shaped frame shape having a horizontal bar 14B connecting the spaces.

The canopy 15 is attached to the counterweight 7 and covers the driver's seat 9 from above. The canopy 15 is a two-post type equipped with, for example, left and right columns 15A erected on the counterweight 7 at intervals in the left and right directions, and a roof 15B provided at the upper ends of the left and right columns 15A. It is configured as a canopy. Although the hydraulic excavator 1 having a canopy specification provided with the canopy 15 is illustrated in the present embodiment, a cab (not shown) may be provided instead of the canopy 15.

The exterior cover 16 is provided on the swivel frame 6 in a state of covering the mounted equipment such as the engine 8, the heat exchanger, the control valve, the hydraulic oil tank, the fuel tank, etc. (none of which are shown) mounted on the swivel frame 6. ing. The exterior cover 16 is provided on the front side of the right rear cover 16A that covers the heat exchanger and the like arranged on the right side of the engine 8 and the right rear cover 16A so as to be openable and closable, and covers the hydraulic oil tank and the fuel tank. And a skirt cover 16C which is arranged from the left front side of the counter weight 7 to the support bracket 6A of the swivel frame 6 and covers between the bottom plate 6B of the swivel frame 6 and the floor member 12.

Next, the soil removal device 17 provided in the lower traveling body 2 of the hydraulic excavator 1 will be described.

The soil removal device 17 is provided on the track frame 2A of the lower traveling body 2. As shown in FIGS. 2 to 4, the soil removal device 17 has a U-shaped elevating arm 17A having one end (base end) attached to the track frame 2A so as to be rotatable upward and downward (swingable). It consists of a rectangular plate-shaped body extending in the left and right directions of the lower traveling body 2, and the central portion on the rear side is attached to the other end (tip) of the elevating arm 17A via a free pin 17B for soil removal work. It is configured to include the soil removal plate 17C of.

Here, as shown in FIGS. 2 to 4, the soil removal device 17 has a configuration in which the soil removal plate 17C can be swung upward and downward by the elevating arm 17A. Therefore, the soil removal device 17 can perform the ground leveling work of pushing out the earth and sand in the traveling direction and leveling the ground by lowering the soil removal plate 17C while the hydraulic excavator 1 is traveling. Further, the soil removal device 17 has a configuration in which both ends of the soil removal plate 17C in the length direction can be swung forward and backward around the position of the free pin 17B. As a result, the soil discharge device 17 can collectively discharge the earth and sand extruded by the soil discharge plate 17C to the left side or the right side of the lower traveling body 2. In this embodiment, not limited to the illustrated example, the soil removal device 17 can be swung up and down with respect to both ends of the soil removal plate 17C in the length direction about the position of the universal pin 17B. May be. As a result, the soil removal device 17 can form a gradient on the ground leveled by the soil removal plate 17C.

The soil removal plate 17C is composed of a plate body extending linearly in the left and right directions, and is a soil removal plate main body 18 attached to the other end of the elevating arm 17A and a cutting edge provided on the front surface 18A of the soil removal plate main body 18. It is composed of 19.

The soil removal plate main body 18 is formed in a rectangular plate shape using, for example, a steel plate, and has a length similar to the distance between the crests 2F of the lower traveling body 2 in the left and right directions (vehicle width direction of the lower traveling body 2). ). The upper and lower intermediate portions of the soil removal plate main body 18 are curved so as to be recessed toward the rear side (elevating arm 17A side) from both ends in the upper and lower directions.

A rear frame 18C for reinforcement is integrally provided on the rear surface 18B of the soil removal plate main body 18. The rear frame 18C is formed by bending a steel plate or the like into a U-shaped cross section, and the front end of the rear frame 18C is joined to the rear surface 18B of the soil removal plate main body 18 by welding or the like. The rear frame 18C forms a box structure portion 18D on the rear surface 18B side of the soil removal plate main body 18 to increase the bending rigidity of the soil removal plate main body 18. The other end of the elevating arm 17A is joined to the rear surface 18E of the rear frame 18C by welding or the like.

An edge mounting plate 18G is provided on the rear surface 18B on the lower end 18F side of the soil removal plate main body 18 so as to be located below the rear frame 18C. The edge mounting plate 18G is formed by bending a steel plate or the like into an L-shaped cross section, and extends in the left and right directions with a length equivalent to, for example, the soil removal plate main body 18. The edge mounting plate 18G is welded to the rear surface 18B of the soil removal plate main body 18 and the lower surface of the rear frame 18C to reinforce the lower end 18F side of the soil removal plate main body 18 to which the cutting edge 19 is mounted. A plurality of bolt insertion holes 18H that penetrate the soil removal plate main body 18 and the edge mounting plate 18G in the plate thickness direction are provided on the lower end 18F side of the soil removal plate main body 18. These plurality of bolt insertion holes 18H are arranged at appropriate intervals in the left and right directions, and each bolt 20 described later is inserted.

The cutting edge 19 is provided on the front surface 18A of the soil removal plate main body 18. As shown in FIGS. 2 to 4, the cutting edge 19 is formed as a rectangular plate using a steel plate or the like, and extends in the left and right directions over the entire length of the soil removal plate main body 18. The cutting edge 19 is located in the middle portion in the left and right directions, and is provided on the fixing portion 19A fixed to the front surface 18A of the soil removal plate main body 18 and the left and right side end portions 19A1 of the fixing portion 19A to discharge. It is provided with left and right overhanging portions 19B protruding forward from the front surface 18A of the earthen plate main body 18. A plurality of bolt insertion holes 19C corresponding to the bolt insertion holes 18H of the soil removal plate main body 18 are formed in the fixing portion 19A of the cutting edge 19. Each of these bolt insertion holes 19C is formed by a counterbore hole and penetrates in the plate thickness direction.

The fixing portion 19A of the cutting edge 19 is detachably fixed to the front surface 18A on the lower end 18F side of the soil removal plate main body 18 by using a plurality of sets of bolts 20 and nuts 21 as fasteners. Each bolt 20 is inserted into the bolt insertion hole 19C of the cutting edge 19 and the bolt insertion hole 18H of the soil removal plate main body 18, and is screwed to the nut 21 on the rear surface 18B side of the soil removal plate main body 18. As a result, the fixing portion 19A of the cutting edge 19 is located at the intermediate portion in the left and right directions of the soil removal plate main body 18 and is fixed to the front surface 18A.

At this time, the lower end 19D of the cutting edge 19 projects diagonally downward from the lower end 18F of the soil removal plate main body 18. Therefore, when the lower end 19D of the cutting edge 19 is grounded, a gap A in the upper and lower directions is formed between the lower end 18F of the soil removal plate main body 18 and the ground. The height of the gap A is set to, for example, about 2 cm to 3 cm.

On the other hand, the upper end portion 19E of the cutting edge 19 is arranged below the upper end 18J of the earth removal plate main body 18 in a state where the cutting edge 19 is attached to the front surface 18A of the earth removal plate main body 18. The cutting edge 19 has a height dimension H (see FIG. 5) in the upper and lower directions, which is smaller than that of the soil removal plate main body 18.

The left and right overhanging portions 19B of the cutting edge 19 are formed symmetrically with the fixed portion 19A interposed therebetween. The left overhanging portion 19B is formed by a bent portion in which the left end side of the cutting edge 19 is bent forward from the fixed portion 19A, and intersects the fixed portion 19A at an obtuse angle θ (see FIG. 4). The right overhanging portion 19B is formed by a bent portion in which the right end side of the cutting edge 19 is bent forward from the fixed portion 19A, and intersects the fixed portion 19A at an obtuse angle θ. The left and right overhanging portions 19B are projected forward from the front surface 18A of the soil removal plate main body 18 in a state where the fixing portion 19A is fixed to the soil removal plate main body 18, respectively. A gap B in the front and rear directions is formed between the two.

As described above, when the cutting edge 19 is attached to the soil removal plate main body 18, a gap B is formed between the soil removal plate main body 18 and the left and right overhanging portions 19B. As a result, as shown in FIG. 6, when the height of the earth and sand E accumulated in front of the soil removal plate 17C exceeds the upper end portion 19E of the overhanging portion 19B during the ground leveling work, a part of the earth and sand E becomes a gap B. It is configured to fall into (enter from above). The earth and sand E that has fallen into the gap B is discharged to the rear surface 18B side of the earth removal plate main body 18 through the gap A formed between the lower end 18F of the earth removal plate main body 18 and the ground. The operator seated in the driver's seat 9 of the hydraulic excavator 1 visually observes the earth and sand E discharged to the rear surface 18B side of the earth removal plate main body 18 as shown in FIG. It is configured so that the amount of water can be grasped. The cutting edge attached to the soil removal plate main body 18 is not limited to the one having a height dimension H from the ground, and one of a plurality of types of cutting edges having different height dimensions H is selectively selected from the soil removal plate main body. It can be attached to 18. In this way, by replacing the cutting edges having different height dimensions H with respect to the soil removal plate main body 18, the amount of earth and sand E accumulated in front of the soil removal plate main body 18 can be appropriately adjusted.

The soil removal device 17 of the hydraulic excavator 1 according to the embodiment has the above-mentioned configuration, and next, the ground leveling work using the soil removal device 17 will be described.

The operator gets into the floor member 12 of the upper swivel body 4 and sits in the driver's seat 9. The operator seated in the driver's seat 9 operates the blade operation lever (not shown). Then, the operator causes the hydraulic excavator 1 to travel by the traveling lever pedal device 13 with the lower end portion 19D of the cutting edge 19 grounded. As a result, the earth and sand E can be pushed forward by the earth removal plate 17C while the ground is ground flat by the cutting edge 19, and the ground leveling work can be performed.

During this leveling work, as shown in FIG. 6, earth and sand E gradually accumulates in front of the earth removal plate 17C. When the height of the earth and sand E exceeds the upper end portion 19E of the overhanging portion 19B of the cutting edge 19, a part of the earth and sand E gets over the upper end portion 19E of the overhanging portion 19B, and the overhanging portion 19B and the earth removal plate main body 18 It falls into the gap B between the front surface 18A and the front surface 18A.

Further, when the hydraulic excavator 1 travels, as shown in FIG. 2, the earth and sand E that has fallen into the gap B passes through the gap A between the lower end 18F of the earth removal plate main body 18 and the ground, and the rear surface 18B of the earth removal plate main body 18. It is discharged to the side (left behind). The earth and sand E discharged to the rear surface 18B side of the soil removal plate main body 18 continues in a strip shape on both the left and right sides of the cutting edge 19 with a width dimension corresponding to the overhanging portion 19B of the cutting edge 19. Therefore, the operator can visually recognize the earth and sand E discharged in a strip shape behind the earth removal plate 17C from the driver's seat 9, and the earth and sand E having a height dimension H of the cutting edge 19 is accumulated in front of the earth removal plate 17C. You can judge that you are there. As a result, the operator temporarily suspends the ground leveling work by the soil removal plate 17C, and before a large amount of earth and sand E is deposited in front of the soil removal plate 17C, the operator collects the soil in front of the soil removal plate main body 18 by using the work device 5. It is possible to shift to the ground leveling work to disperse (level) the sediment E.

When performing the ground leveling work using the work device 5, the operator operates the left and right operation levers 10 with the hydraulic excavator 1 stopped running, and extends the work device 5 forward. The bucket 5D is placed on the front side of the excavator plate 17C. In this state, for example, the upper swivel body 4 is swiveled to move the bucket 5D to the left and right in front of the soil removal plate 17C. In this way, the earth and sand E accumulated in front of the earth removal plate 17C can be leveled in a plane by using the working device 5.

In this way, the operator can perform the ground leveling work while appropriately leveling the earth and sand E accumulated in front of the soil discharge plate 17C by the ground leveling work using the work device 5. That is, the work apparatus is in a state where the earth and sand E having a height dimension H of the cutting edge 19 is accumulated in front of the earth removal plate 17C (a state in which the amount of earth and sand E accumulated in front of the earth removal plate 17C is relatively small). By shifting to the ground leveling work using 5, it is possible to prevent a large amount of earth and sand E from accumulating in front of the soil discharge plate 17C during the ground leveling work. Therefore, it is possible to avoid spending a large amount of time on the work of leveling the large amount of earth and sand E accumulated in front of the earth removal plate 17C by using the work device 5, and improve the workability of the leveling work. Can be done.

Thus, according to the embodiment, the soil removal plate 17C of the soil removal device 17 is composed of a plate body extending in the left and right directions, and is a soil removal plate main body 18 attached to the other end of the elevating arm 17A and a soil removal plate. Cutting having a lower end portion 19D protruding downward from the lower end 18F of the main body 18 and an upper end portion 19E located below the upper end 18J of the earth removal plate main body 18 while being attached to the front surface 18A of the earth removal plate main body 18. An edge 19 is provided, and the cutting edge 19 is provided at a fixing portion 19A fixed to the soil removal plate main body 18 and a side end portion 19A1 of the fixing portion 19A, and projects forward from the front surface 18A of the soil removal plate main body 18. It is provided with an overhanging portion 19B having a gap B formed between the soil discharging plate main body 18 and the soil discharging plate main body 18.

Therefore, when the height of the earth and sand E accumulated in front of the soil removal plate main body 18 during the ground leveling work exceeds the upper end portion 19E of the overhanging portion 19B, a part of the earth and sand E gets over the upper end portion 19E of the overhanging portion 19B. It falls into the gap B between the overhanging portion 19B and the soil removal plate main body 18. As a result, when the hydraulic excavator 1 travels, the earth and sand E that has fallen into the gap B passes through the gap A between the lower end 18F of the earth removal plate main body 18 and the ground, and is on the rear surface 18B side of the earth removal plate main body 18 (soil removal plate 17C). Behind) is discharged. By visually observing the earth and sand E discharged behind the earth removal plate 17C from the driver's seat 9, the operator can confirm that the earth and sand E having a height dimension H of the cutting edge 19 has accumulated in front of the earth removal plate 17C. You can judge. Therefore, the operator can perform the ground leveling work using the work device 5 at the stage where the amount of earth and sand E accumulated in front of the earth removal plate 17C is relatively small. As a result, it is possible to avoid spending a large amount of time on the work of leveling the large amount of earth and sand E deposited in front of the earth removal plate 17C by using the work device 5 during the ground leveling work. As a result, the operator can perform the ground leveling work while appropriately leveling the earth and sand E accumulated in front of the soil discharge plate 17C by the ground leveling work, and the workability can be improved.

Further, according to the embodiment, the overhanging portion 19B of the cutting edge 19 is formed by a bent portion bent forward from the fixed portion 19A. Therefore, with the fixed portion 19A of the cutting edge 19 attached to the soil removal plate main body 18, each overhanging portion 19B projects forward from the front surface 18A of the soil removal plate main body 18, so that each overhanging portion 19B and the soil removal plate A gap B can be formed between the main body 18 and the front surface 18A.

Further, according to the embodiment, the cutting edge 19 is composed of a plate body having a height dimension H smaller in the upper and lower directions than the soil removal plate main body 18, and the fixing portion 19A of the cutting edge 19 is the soil removal plate main body 18. It is detachably fixed using bolts 20 and nuts 21 as fasteners. Therefore, by selectively attaching one of the plurality of types of cutting edges having different height dimensions H to the soil removal plate main body 18, the amount of earth and sand E accumulated in front of the soil removal plate main body 18 during the leveling work is appropriately adjusted. Can be adjusted to.

In the embodiment, the case where the overhanging portion 19B of the cutting edge 19 is formed by a bent portion bent forward from the fixed portion 19A has been described as an example. However, the present invention is not limited to this, and for example, it is attached to both ends of the fixing portion via a bracket or the like, and is left and right in a state where a certain distance is formed from the front surface 18A of the soil removal plate main body 18. An overhanging portion extending in parallel may be formed. That is, the overhanging portion of the cutting edge may be configured to project forward from both sides of the fixed portion.

Further, in the embodiment, the earth removal plate main body 18 is configured to extend linearly (straight) in the left and right directions with respect to the cutting edge 19 having the overhanging portions 19B on both the left and right directions. I explained it with an example. However, the present invention is not limited to this, and for example, both ends of the soil removal plate main body may be curved (or bent) forward. At this time, it is sufficient that there is a gap between both ends of the soil removal plate main body and the overhanging portion of the cutting edge so that earth and sand can enter.

Further, in the embodiment, the case where the bolt 20 and the nut 21 are used as the fasteners for fixing the cutting edge 19 to the soil removal plate main body 18 has been described as an example. However, the present invention is not limited to this, and for example, a female screw portion may be provided at the lower end edge of the soil removal plate main body, and the cutting edge may be fixed to the soil removal plate main body by using a bolt screwed to the female screw portion. .. Further, the cutting edge may be fixed to the lower end of the soil removal plate main body by welding.

Further, in the embodiment, a crawler type hydraulic excavator 1 has been described as an example of a construction machine. However, the present invention is not limited to this, and can be widely applied to other construction machines such as wheel-type hydraulic excavators.

1 Hydraulic excavator (construction machinery)
2 Lower running body (body)
17 Soil removal device 17A Lifting arm 17C Soil removal plate 18 Soil removal plate body 18A Front surface 18B Rear surface 18F Lower end 18J Upper end 19 Cutting edge 19A Fixed part 19B Overhanging part 19D Lower end part 19E Upper end part 20 Bolt (fastener)
21 Nuts (fasteners)
B Gap H Height dimension

Claims (3)

An elevating arm with one end rotatably attached to a vehicle body that can self-propell in the front and rear directions,
A soil removal plate attached to the other end of the elevating arm is provided.
The soil removal plate is composed of a plate body extending in the left and right directions, and has a soil removal plate main body attached to the other end of the elevating arm.
A cutting edge having a lower end portion protruding downward from the lower end of the soil removal plate main body and an upper end portion located below the upper end of the soil removal plate main body in a state of being attached to the front surface of the soil removal plate main body. In the earth removal device of construction machinery equipped with
The cutting edge includes a fixing portion fixed to the soil removal plate main body and a fixing portion.
A construction machine provided at a side end portion of the fixed portion and provided with an overhanging portion that projects forward from the front surface of the soil removal plate main body and forms a gap between the soil removal plate main body and the soil discharging plate main body. Soil removal equipment. The earth removal device for a construction machine according to claim 1, wherein the overhanging portion of the cutting edge is formed by a bent portion that is bent forward from the fixed portion. The cutting edge is made of a plate having a height dimension smaller in the upper and lower directions than the soil removal plate main body, and the fixing portion of the cutting edge is detachably fixed to the soil removal plate main body by using a fastener. The earth removal device for a construction machine according to claim 1, wherein the earth removal device is characterized.

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