JP6663404B2 - Construction equipment - Google Patents

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earth removal device for a construction machine which is suitably used for performing earth removal work such as earth and sand.

  In general, a hydraulic excavator as a construction machine includes a self-propelled lower traveling body, an upper revolving body that is mounted on the lower traveling body so as to be capable of turning, and forms a vehicle body together with the lower traveling body, It is roughly constituted by a working device provided at the front part so as to be able to move upward and downward. 2. Description of the Related Art There is known a hydraulic excavator in which a truck frame constituting a lower traveling body is provided with an earth discharging device for performing earth discharging work such as earth and sand. In addition, a working machine that performs a snow removing operation using a blade (a soil removal plate) is also known (for example, see Patent Document 1).

JP 2004-238915 A

  By the way, in the above-described conventional earth discharging device, a pole is fixedly provided at an end of a blade (earth discharging plate), and an operator visually checks the pole position to check the width of the blade. However, only by providing such a pole, for example, in the middle of snow removal work or earth removal work, it is difficult to grasp the distance between the curb and the blade beside the road, and in some cases, the blade is brought into contact with the curb, There is a risk of damaging the curb. In order to prevent this, it was necessary to previously install a curb or a mark above it. Alternatively, it was necessary to avoid the contact by increasing the distance between the curb and the blade in advance.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems of the related art, and an object of the present invention is to provide, for example, an earth removal device for a construction machine capable of easily grasping a distance between a curb and a blade beside a road. To provide.

  In order to solve the above-described problems, the present invention provides a blade for earth removal work provided on a vehicle body of a construction machine, comprising a plate-like body extending in left and right directions, and a left end portion and a right end portion of the blade. A blade position detecting device provided at at least one of the side ends, and detecting whether or not one side end of the blade approaches an obstacle located on the side of the blade. In the above-described construction machine, the blade position detecting device is mounted such that a base end thereof is rotatable forward and backward with a rear surface side of the blade as a fulcrum, and a front end is attached to one side end of the blade. A pivot arm extending toward the blade, a spring member for urging the pivot arm toward the rear surface of the blade, and a pivot about a support shaft extending upward and downward at the tip of the pivot arm. Wherein the rotating arm is provided with the spring portion. It is characterized in that it is constituted by a circular rotary member protruding outwardly left and right direction than the position of one side end portion of the blade closest position to the rear surface of the blade by.

  According to the present invention, for example, during the snow removal operation or the earth removal operation, when the blade approaches the curb beside the road, the rotating member of the blade position detecting device comes into contact with the curb and rotates. Thereby, the operator of the construction machine can know that the blade is approaching the curb by looking at the rotating member, and can easily grasp the distance between the curb and the blade.

It is a front view showing the hydraulic shovel provided with the earth removal device by an embodiment of the invention. It is a top view which expands and shows the lower traveling body and the earth discharging device in FIG. FIG. 3 is an enlarged partial plan view showing an arrow III part in FIG. 2. It is the fragmentary perspective view which looked at the blade position detecting device provided in the blade of the earth removal device from diagonally rear. FIG. 5 is an enlarged perspective view showing a blade position detecting device in a state where a pole in FIG. 4 is removed. FIG. 6 is a perspective view showing a state where a pole is attached to the blade position detecting device of FIG. 5.

  Hereinafter, an earth removal device of a hydraulic shovel will be described in detail as an example of an earth removal device of a construction machine according to an embodiment of the present invention, with reference to FIGS. 1 to 6 of the accompanying drawings.

  In FIG. 1, a hydraulic excavator 1 as a construction machine is a canopy type excavator. The hydraulic excavator 1 is a crawler-type lower traveling body 2 that is capable of self-traveling, and is mounted on the lower traveling body 2 so as to be capable of turning via a turning device 3, and is an upper turning part that forms a vehicle body together with the lower traveling body 2. A work device 5 provided on the front side of the upper revolving structure 4 so as to be capable of swinging and raising and lowering, and a below-described discharging device 21 provided on the front side of the lower traveling structure 2. I have. The lower traveling body 2 and the upper revolving superstructure 4 constitute a vehicle body of a construction machine (the hydraulic excavator 1).

  Here, as shown in FIG. 2, the lower traveling body 2 is, for example, a center frame 6A formed in a flat box shape at the center, and located on both left and right sides of the center frame 6A, in the forward and rearward directions. The left and right side frames 6B (only the left side is shown in FIG. 1), and a track frame 6 including left and right legs 6C connecting the center frame 6A and each side frame 6B are provided. . In the lower traveling unit 2, idle wheels 7 are provided at one end of each side frame 6B, and drive wheels 8 are provided at the other end. Left and right crawler belts 9 are wound between each idle wheel 7 and each drive wheel 8.

  The center frame 6A of the track frame 6 is provided with a turning device 3 on the upper surface side, and a center joint 10 is provided at the center of turning. Further, a cylinder bracket 6D, which is located at the center and to which an elevating cylinder 25 of the earth discharging device 21 described later is attached, and a base end of an arm 22 which is located on both the left and right sides are provided on the front side of the center frame 6A. An arm bracket 6E to be attached is provided.

  As shown in FIG. 1, the upper revolving superstructure 4 includes a revolving frame 11 mounted on the truck frame 6 via the revolving device 3, a driver's seat 12 mounted on the left side of the revolving frame 11, and seated by an operator. The counterweight 13 is mounted on the rear end of the revolving frame 11 and balances the weight of the working device 5. The counterweight 13 includes a four-column canopy 14 that covers the upper part of the driver's seat 12.

  Next, the discharging device 21 of the hydraulic shovel 1 provided on one side in the front and rear directions of the lower traveling body 2 will be described. The earth discharging device 21 performs, for example, an earth discharging operation, a snow removing operation and the like while driving the lower traveling body 2. The earth discharging device 21 includes an arm 22, a blade 24, an elevating cylinder 25, an angle cylinder 26, a tilt cylinder 27, and a blade position detecting device 30, which will be described later.

  The arm 22 of the earth discharging device 21 is provided so as to extend forward and backward of the lower traveling body 2. As shown in FIG. 2, the arms 22 include left and right arm portions 22A and 22B formed as substantially V-shaped frames so as to approach each other toward the front end (tip) side. A vertical plate-shaped front plate 22C fixedly provided at the distal ends of the portions 22A and 22B, and a lifting cylinder bracket 22D provided at an intermediate position between the arm portions 22A and 22B and to which a lifting cylinder 25 described later is attached. An angle cylinder bracket 22E, which is provided near the left side base end of the left arm portion 22A and to which an angle cylinder 26 described below is attached, and a tilt cylinder which is provided to protrude forward above the front plate 22C, and which is described below. 27 is attached to the tilt cylinder bracket 22F.

  The base ends of the left and right arm portions 22A and 22B of the arm 22 are rotatably connected (pin-coupled) to the respective arm brackets 6E of the lower traveling body 2 (track frame 6) via pins 23, respectively. . Thus, the arm 22 of the earth discharging device 21 is moved up and down around the pin 23 of each arm bracket 6E together with a blade 24 and the like described later.

  The blade 24 constitutes an earth discharging plate used for the earth discharging operation. The blade 24 is swingably attached to the tip of the arm 22 via a free pin (not shown). The blade 24 is turned up and down by the arm 22 so as to be able to move up and down, and can perform an angle operation and a tilt operation by the universal pin. The blade 24 is formed of a high-strength plate-like body extending in the left and right directions by welding a plurality of steel plates or the like by welding, and has a left end 24L and a right end 24R. A cutting edge 24 </ b> A serving as a lower edge for flatly shaving the ground G is provided below the front surface of the blade 24.

  As shown in FIG. 2, on the rear surface (rear surface) side of the blade 24, a central bracket 24B which is located near the center and is pin-coupled to a pin hole (not shown) of the universal pin, There is provided a left bracket 24C to which the angle cylinder 26 is pin-coupled, and a right bracket 24D which is located at the upper right side and to which the tilt cylinder 27 is pin-coupled.

  The lifting cylinder 25 is provided between the track frame 6 of the lower traveling body 2 and the arm 22. The lift cylinder 25 is an actuator (cylinder device) that moves the blade 24 up and down via the arm 22. A protective cover 25A is attached to the lifting cylinder 25 so as to cover the upper side thereof. The lift cylinder 25 is rotatably mounted between the cylinder bracket 6D of the track frame 6 and the lift cylinder bracket 22D of the arm 22. The lifting cylinder 25 is connected to a control valve (not shown) on the track frame 6 side via a hydraulic hose. The elevating cylinder 25 is contracted and extended by supply and discharge of pressure oil, and moves the blade 24 up and down together with the arm 22.

  The angle cylinder 26 is provided between the arm 22 and the blade 24. The angle cylinder 26 is an actuator (cylinder device) that makes the blade 24 perform an angle operation. A protective cover 26A is attached to the angle cylinder 26 so as to cover the upper side. The angle cylinder 26 is disposed at a position on the left side of the universal pin when viewed from an operator sitting on the driver's seat 12 of the upper swing body 4. The driver's seat 12 is provided on the left side of the upper swing body 4.

  Thus, the angle cylinder 26 can be easily viewed from an operator sitting on the driver's seat 12. Therefore, for example, it is possible to prevent a situation in which the angle cylinder 26 collides with an obstacle and is damaged during the discharging operation. The angle cylinder 26 is connected to a control valve on the track frame 6 side via a hydraulic hose similarly to the lifting cylinder 25. The angle cylinder 26 is extended and contracted by supply and discharge of pressure oil, and causes the blade 24 to perform an angle operation forward and backward (directions indicated by arrows A and B) around the free pin (the position of the central bracket 24B). It is.

  The tilt cylinder 27 is provided between the arm 22 and the blade 24. The tilt cylinder 27 is an actuator (cylinder device) for tilting the blade 24. The tilt cylinder 27 is also extended and contracted by supplying and discharging the pressure oil, and tilts the left and right sides of the blade 24 upward and downward. The tilt cylinder 27 is disposed on the right side of the angle cylinder 26 with the universal pin interposed therebetween, that is, on the right side when viewed from the operator seated on the driver's seat 12. The upper side of the tilt cylinder 27 is covered with a protective cover 28 attached to the blade 24.

  In this way, by arranging the heavy angle cylinder 26 and the tilt cylinder 27 separately on the left and right, the center of gravity of the earth discharging device 21 can be made closer to the center in the left and right directions, and the earth discharging is performed. The device 21 can balance the weight in the left and right directions. Although the tilt cylinder 27 is located on the opposite side (right side) of the driver's seat 12 on the left side, it is arranged at a position higher than the universal pin. 27 can be easily seen from above.

  At the left end 24L of the blade 24, it is detected whether or not the left end 24L of the blade 24 approaches an obstacle 29 (shown by a two-dot chain line in FIG. 2) located on the left side of the blade 24. A blade position detecting device 30 is provided. The blade position detecting device 30 includes an arm mounting bracket 31 fixedly provided on the rear surface of the blade 24, a rotating arm 33 rotatably mounted on the arm mounting bracket 31 via a fulcrum pin 32, It is configured to include a spring mounting bracket 34, a spring member 35, a disk-shaped rotating member 36, and a pawl 38.

  As shown in FIG. 5, the arm mounting bracket 31 of the blade position detecting device 30 is constituted by two rectangular bracket plates 31A and 31B which are separated from each other in the upward and downward directions. The base ends of these bracket plates 31A and 31B are fixed to the rear surface of the blade 24 by welding or adhesion, and the front ends project toward the rear of the blade 24. A fulcrum pin 32 including, for example, a bolt 32A and a nut 32B is provided on a protruding end (rear end) side of each bracket plate 31A, 31B. The fulcrum pin 32 is located between the bracket plates 31A, 31B. , Arranged downward.

  The turning arm 33 is, for example, a turning arm formed by bending a long plate material into a U-shape. As shown in FIG. 3, the rotating arm 33 is disposed on the rear surface side of the blade 24 so as to extend leftward and rightward along the rear surface. The rotating arm 33 is, for example, rotatably mounted on the right end (base end) side between the bracket plates 31A and 31B of the arm mounting bracket 31 via the fulcrum pin 32. Thus, the turning arm 33 is attached so that its base end can turn forward and backward with the rear surface of the blade 24 as a fulcrum. The tip of the U-shaped rotating arm 33 is a free end, and extends toward the left end 24 </ b> L of the blade 24.

  The spring mounting bracket 34 is provided at a position closer to the left end 24L of the blade 24 than the arm mounting bracket 31 and is fixed to the rear surface of the blade 24 by welding or bonding. The spring mounting bracket 34 constitutes a stopper in which a protruding end side of the blade 24 protruding rearward contacts an intermediate portion in the length direction (left and right directions) of the rotating arm 33. That is, the rotating arm 33 that rotates with the fulcrum pin 32 as a fulcrum is attached to the protruding end (stopper) of the spring mounting bracket 34 at the rotating position (the position closest to the rear surface of the blade 24) shown by the solid line in FIG. It is positioned in contact.

  The spring mounting bracket 34 has a spring hooking projection 34A projecting upward and downward, and a similar spring hooking projection 33A is provided at a middle portion in the length direction of the rotating arm 33. Between the spring hooking projections 33A and 34A, both ends of a spring member 35 composed of, for example, a tension spring are hooked and provided. The spring member 35 constantly urges the rotating arm 33 toward the rear surface of the blade 24 (that is, the spring hooking projection 34A of the spring mounting bracket 34), so that the rotating arm 33 becomes a solid line in FIG. As shown by, it is rotated to a position where it comes into contact with the protruding end of the spring mounting bracket 34.

  A support shaft 37 that rotatably supports the rotating member 36 is provided on the free end side of the U-shaped rotating arm 33. The support shaft 37 extends upward and downward on the free end (tip) side of the rotating arm 33, and includes a bolt 37A and a nut 37B. A rotating member 36 is provided on the upper surface side of the rotating arm 33 so as to be rotatable about a support shaft 37. The rotating member 36 is configured by a circular roller. A bearing (not shown) for smoothing the rotation of the rotating member 36 is provided between the rotating member 36 and the support shaft 37.

  When the turning arm 33 is turned to a turning position indicated by a solid line in FIG. 3 (a position closest to the rear surface of the blade 24), the turning member 36 made of a roller is connected to one side end of the blade 24. Part (that is, the left end 24L) protrudes outward in the left and right directions. Therefore, the outer peripheral surface of the rotating member 36 comes into contact with an obstacle 29 (for example, an obstacle 29 such as a curb indicated by a two-dot chain line in FIGS. 2 and 3) located on the left side of the blade 24. As a result, the rotating arm 33 is rotated in the direction indicated by the arrow C against the spring member 35 to the position shown by the two-dot chain line in FIG. 3, and the rotating member 36 is rotated by contact with the obstacle 29. Is done.

  The pole 38 is formed, for example, as an elongated rod-like body extending upward and downward. The lower end of the pole 38 is fixed to the upper surface of the rotating member 36 by means of, for example, welding, bonding, screwing or fitting, and the upper end of the pole 38 exceeds the upper end (height dimension) of the blade 24. It is a free end extending upward. A pattern 38A such as vertical stripes is applied to the outer peripheral surface of the pole 38, and the pole 38 is rotated integrally with the rotating member 36. The pawl 38 does not necessarily need to be provided with the pattern 38A or the like. For example, the pawl 38 may be provided eccentrically with respect to the rotating member 36 so that the operator can visually recognize whether or not the pawl 38 is rotating. The pole 38 is formed as a rod made of a metal or a resin material.

  The earth discharging device 21 of the hydraulic shovel 1 according to the present embodiment has the above-described configuration, and its operation will be described next.

  First, when excavating earth and sand at a work site, the operator sits on the driver's seat 12 of the upper revolving unit 4 and operates various levers to perform a traveling operation at the work site. The excavation work (including gutter work) can be performed by raising and lowering the device 5.

  When the earth discharging operation is performed using the earth discharging device 21, the blade 24 is lowered (oscillated) downward through the arm 22 while the elevating cylinder 25 is extended, and the cutting edge 24 A is moved to the ground G. Ground. By moving the lower traveling body 2 in this state, soil and the like in the traveling direction can be extruded by the blade 24, and the ground leveling work at the work site, the backfilling of the earth and sand, and the like can be performed.

  Further, in addition to the above-described earth removal operation, the earth discharging device 21 tilts the blade 24 forward and backward (directions indicated by arrows A and B in FIG. 2) by operating the blade 24 by an angle cylinder 26. The soil and the like scraped off by the blade 24 can be discharged to the side of the lower traveling body 2 and can be used for snow removal work. In addition, by tilting the blade 24 to the left or right by tilting the blade 24 with the tilt cylinder 27, it is possible to level the ground at an arbitrary angle regardless of the inclination of the ground G.

  By the way, when the earth removal work (especially snow removal work) or the like is performed using the earth removal device 21, for example, it is difficult to grasp the distance between the curb beside the road and the blade 24 in a state of being buried in snow. In some cases, the blade 24 may come into contact with the curb and damage the curb. In the related art described in Patent Document 1 described above, a pole is fixedly provided at the end of the blade, and the width of the blade is confirmed by visually recognizing the pole position by an operator. However, providing such a pole alone is not a sufficient solution, and a new solution has been desired.

  Therefore, in the present embodiment, the blade position detecting device 30 is provided on the left end 24L of the blade 24, and whether the left end 24L of the blade 24 approaches the obstacle 29 located on the left side of the blade 24 is determined. Is detected. The blade position detecting device 30 has an arm mounting bracket 31 fixedly provided on the rear surface of the blade 24 and a base end rotatably mounted on the arm mounting bracket 31 via a fulcrum pin 32 in a forward and rearward direction. A pivot arm 33 having a tip extending toward the left end 24L of the blade 24, a spring member 35 that constantly biases the pivot arm 33 in a direction approaching the rear surface of the blade 24, and a tip of the pivot arm 33 And a rotating member 36 composed of a circular roller provided rotatably about a support shaft 37 extending upward and downward.

  When the rotating arm 33 is biased by the spring member 35 to the position closest to the rear surface of the blade 24, the rotating member 36 is positioned at one side end (ie, the left end 24L) of the blade 24. It protrudes outward to the left and right. Therefore, the outer peripheral surface of the rotating member 36 comes into contact with an obstacle 29 (for example, an obstacle 29 such as a curb indicated by a two-dot chain line in FIGS. 2 and 3) located on the left side of the blade 24. Thereby, the rotating arm 33 is rotated in the direction of arrow C against the spring member 35 to the position shown by the two-dot chain line in FIG. 3, and the rotating member 36 is rotated by contact with the obstacle 29. Is done.

  Further, on the upper surface side of the rotating member 36, a pole 38 formed as an elongated rod-like body extending upward and downward is provided. The upper end of the pawl 38 is a free end extending upward beyond the upper end (height dimension) of the blade 24, and is rotated integrally with the rotating member 36. Moreover, a pattern 38A such as a vertical stripe is provided on the outer peripheral surface of the pole 38, so that whether the pole 38 is rotating together with the rotating member 36 can be visually recognized from the outside.

  With this configuration, when it is desired to shift the left end 24 </ b> L of the blade 24 to a position near an obstacle 29 such as a curb located on the left side of the blade 24 at the time of the operation by the earth removal device 21, the rotating member 36 is used. Rotates in contact with the curb (obstacle 29) before the blade 24. At the same time, the turning arm 33 on which the rotating member 36 is installed can swing about the fulcrum pin 32 in the direction indicated by the arrow C in FIG. 3, so that the curb is not damaged.

  Further, the rotation of the rotating member 36 in contact with the obstacle 29 causes the pawl 38 with the pattern 38A to rotate, so that the operator sitting in the driver's seat 12 visually recognizes the rotation of the pawl 38, and With the position detection device 30, it can be easily visually recognized whether or not the rotating member 36 has contacted the obstacle 29, and the earth removal operation (especially, snow removal operation) can be performed with ease without damaging the curbstone. .

  The blade position detecting device 30 employed in the present embodiment is provided on the rear surface of the blade 24 so as to protrude rearward, and includes an arm mounting bracket 31 to which the base end of the rotating arm 33 is rotatably mounted. And a spring mounting bracket 34 protruding rearward from the rear surface of the blade 24 at a position closer to one side end (for example, the left end 24L) than the position of the arm mounting bracket 31. . The spring member 35 is constituted by a tension spring provided between the rotating arm 33 and the spring mounting bracket 34.

  Accordingly, the spring member 35 can be urged to pull the rotating arm 33 in a direction to always approach the spring mounting bracket 34. The spring mounting bracket 34 contacts the rotating arm 33 at a position where the rotating arm 33 is closest to the rear surface of the blade 24. Therefore, the spring mounting bracket 34 is used as a stopper for positioning the rotating arm 33 at this position. be able to. Moreover, when the outer peripheral surface of the rotating member 36 (roller) comes into contact with an obstacle 29 such as a curb indicated by a two-dot chain line in FIGS. 2 and 3, the rotating arm 33 is rotated in the direction of arrow C. The rotation member 36 can be allowed to contact the obstacle 29 excessively strongly.

  Therefore, according to the present embodiment, in the hydraulic excavator 1 including the blade 24, the left end 24L of the blade 24 is provided with the rotatable and swingable rotating member 36 and the pawl 38, so that the position of the blade 24 is adjusted. It is easy to visually recognize, and the earth removal work can be performed with confidence without damaging the curb and the like. For this reason, the distance between the curb (obstacle 29) on the side of the road and the left end portion 24L of the blade 24 is easily grasped by the blade position detecting device 30 at the time of the soil discharging operation and the snow removing operation performed using the earth discharging device 21. Thus, the work using the blade 24 can be efficiently performed while reducing the burden on the operator.

  In the above embodiment, the case where the blade position detecting device 30 is provided at the left end 24L of the blade 24 has been described as an example. However, the present invention is not limited to this. For example, a configuration may be adopted in which a blade position detecting device is provided at the right end 24R of the blade 24. Further, the blade position detecting device may be provided on both the left end 24L and the right end 24R of the blade 24.

  Further, in the above-described embodiment, an example has been described in which the rotating arm 33 of the blade position detecting device 30 is formed by bending a long plate material into a U-shape. However, the present invention is not limited to this. For example, the rotating arm may be configured as a rotating arm made of an elongated plate (one or a plurality of plates). That is, the rotating arm may have a configuration in which the base end is mounted to be rotatable forward and backward with the rear surface side of the blade as a fulcrum, and the distal end extends toward one side end of the blade. .

  Further, in the above-described embodiment, the case where the spring member 35 is configured by a tension spring has been described as an example. However, the present invention is not limited to this, and the spring member may be constituted by a compression spring, for example. In this case, the spring member only needs to be configured to bias the rotating arm toward the rear surface of the blade. For example, the spring member is compressed at a position opposite to the rotating member (support shaft) across the fulcrum of the rotating arm. A configuration in which a spring member made of a spring is provided may be adopted.

  On the other hand, in the embodiment, the angle cylinder 26 is arranged on the left side of the earth discharging device 21 and the tilt cylinder 27 is arranged on the right side of the earth discharging device 21 as viewed from the operator sitting on the driver's seat 12. explained. However, the present invention is not limited to this, and the angle cylinder 26 may be arranged on the right side of the earth discharging device 21, and the tilt cylinder 27 may be arranged on the left side of the earth discharging device 21.

  Further, in the above-described embodiment, an example has been described in which the blade 24 is provided on the lower traveling body 2 with the earth discharging device 21 capable of tilting operation and angle operation in addition to the vertical operation. However, the present invention is not limited to this, and can be applied to, for example, an earth discharging device in which the blade performs only up and down operations.

  In the above-described embodiment, the case where the earth discharging device 21 is provided in the hydraulic excavator 1 including the canopy 14 that covers the upper part of the driver's seat 12 has been described as an example. However, the present invention is not limited to this, and may be applied to, for example, a hydraulic shovel provided with a cab box that covers the periphery of the driver's seat 12.

  Further, in the embodiment, the crawler-type hydraulic excavator 1 including the upper revolving unit 4 on the lower traveling unit 2 has been described as an example of the construction machine. However, the present invention is not limited to this, and the present invention is not limited to this. The present invention may be applied to a hydraulic excavator, and may also be applied to an earth removal device provided in another construction machine (for example, a wheel loader, a bulldozer, or the like) that does not include the upper swing body.

1 Hydraulic excavator (construction equipment)
2 Undercarriage (body)
4 Upper revolving superstructure (body)
Reference Signs List 6 track frame 12 driver's seat 21 earth removal device 22 arm 24 blade 25 elevating cylinder 29 obstacle 30 blade position detecting device 31 arm mounting bracket 32 fulcrum pin 33 rotating arm 34 spring mounting bracket 35 spring member 36 rotating member 37 rotating shaft 38 Pole

Claims (4)

A blade for unloading work provided on a vehicle body of a construction machine, comprising a plate-like body extending leftward and rightward;
It is provided on at least one of the left end and the right end of the blade, and determines whether one side end of the blade approaches an obstacle located on the side of the blade. In the earth removal device of construction machinery comprising a blade position detection device that detects
The blade position detection device,
A rotating arm whose base end is rotatably mounted in the front and rear directions with the rear side of the blade as a fulcrum, and whose tip extends toward the one side end of the blade;
A spring member for urging the rotating arm toward the rear surface of the blade,
One end of the blade is provided at the tip of the rotating arm so as to be rotatable about a support shaft extending upward and downward, and the rotating arm is closest to the rear surface of the blade by the spring member. A soil discharging device for a construction machine, comprising: a circular rotating member protruding outward in the left and right directions from an end position. The blade position detection device,
An arm mounting bracket provided on the rear surface of the blade, and a base end of the rotating arm is rotatably mounted.
At a position closer to one side end of the blade than the position of the arm mounting bracket, comprising a spring mounting bracket provided on the rear surface of the blade,
The apparatus according to claim 1, wherein the spring member is a tension spring attached to the rotating arm and the spring attachment bracket.   The said spring mounting bracket of the said blade position detection apparatus comprises the stopper which abuts on the said rotation arm in the position where the said rotation arm came closest to the back surface of the said blade, and is positioned, The said stopper is characterized by the above-mentioned. 3. The earth removal device for construction machinery according to 2.   2. The apparatus according to claim 1, wherein the rotating member of the blade position detecting device includes a pole extending upward beyond a height of the blade. 3.

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