JP2018053559A - Construction machinery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction machinery that allows snow removing work to be performed efficiently without causing damage to a work device, even on roads having a narrow road width such as roads in urban areas, etc.SOLUTION: The present invention comprises an obstruction detection device 216 for detecting obstacles existing ahead of a vehicle in the direction the vehicle travels in, and a controller 15 which controls the width of a work device 13 according to a detection result from the obstruction detection device 216. The controller 15 comprises a width acquisition part 152 for acquiring the present width of the work device 13, an obstruction separation distance calculation part 153 for calculating the obstruction separation distance based on the detection result from the obstruction detection device 216, a determination part 154 for determining whether the width of the work device 13 is larger than the obstruction separation distance, and a width changing part 155 for changing the width of the work device 13 to reduce said width of the work device 13 when the determination part 154 determines that the width of the work device 13 is larger than the obstruction separation distance.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a construction machine that performs snow removal using a working device while a vehicle is traveling.

  In general, in snow removal work on a traffic road, a wheel-type construction machine such as a snow removal truck, a rotary snow removal vehicle, a wheel loader equipped with a bucket or a snow plow is used. When removing snow that has accumulated on the road using a working device such as a bucket or snow plow when removing snow, the scraped snow overflows from the working device, causing snow accumulation on both sides of the snow-removed road, so-called windrows. Will occur.

  As a technique for efficiently removing windrows, a device is known that can change the width of the work device in order to remove snow in a wider range than the width of the host vehicle. In the windrow removal work, it is necessary to appropriately adjust the width of the working device according to the shape of the road such as a branch or the presence of an obstacle such as a utility pole or a sign present on the road.

  Conventionally, since the operator who operates the vehicle manually adjusts the work device, the burden on the operator increases and it takes time for snow removal work. Therefore, a snow removal vehicle that automates the adjustment operation of the work device by attaching an automatic control unit including a marker arranged before and after a predetermined section and a detection sensor for detecting the marker to the construction machine. Have been proposed (see, for example, Patent Document 1).

Japanese Patent No. 5361520

  The prior art disclosed in Patent Document 1 described above is such that when a vehicle travels on a main road or a main road, markers are installed in predetermined sections of these roads to automate the adjustment operation of the work device. Thus, the efficiency of snow removal work can be improved. However, it is difficult to remove snow by driving a large vehicle to which the conventional technology of Patent Document 1 is applied on a road having a narrow width such as a road in an urban area as compared with a main road or a main road. .

  In addition, it is troublesome to install markers at every corner of urban roads and residential roads where snow removal work is necessary. On such roads, utility poles, road signs, There are many obstacles in workplaces such as houses. Therefore, as in the prior art of Patent Document 1, the use of a working device whose width is larger than the vehicle width of the host vehicle increases the possibility of the working device coming into contact with each obstacle in the work place. There is concern that the device will be damaged.

  The present invention has been made based on the actual situation of the prior art as described above. The purpose of the present invention is to perform snow removal work efficiently without damaging the work device even on a narrow road such as an urban road. It is to provide a construction machine that can perform.

  In order to achieve the above object, a construction machine according to the present invention includes a movable working device that can be changed in width with respect to a vehicle, and removes snow while the working device projects to the side of the vehicle. An obstacle detection device that detects an obstacle existing in front of the traveling direction of the vehicle, and the work as viewed from the traveling direction of the vehicle according to a detection result of the obstacle detection device. A control device for controlling the width of the working device indicating a distance from the center of the device to one side of the working device, the control device, a width acquisition unit for acquiring the current width of the working device; Based on the detection result of the obstacle detection device, an obstacle separation distance calculation unit that calculates an obstacle separation distance indicating a distance from the center of the work device to the obstacle as viewed from the traveling direction of the vehicle, By width acquisition department The obtained width of the working device is compared with the obstacle separation distance calculated by the obstacle separation distance calculation unit, and it is determined whether or not the width of the working device is larger than the obstacle separation distance. And a width changing unit that changes the width of the working device so that the width of the working device is reduced when the width of the working device is determined to be larger than the obstacle separation distance by the determining unit. It is characterized by having.

  According to the construction machine of the present invention, it is possible to efficiently perform snow removal work without damaging the work device even on a narrow road such as an urban road. Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

It is a side view showing composition of a wheel loader given as an example of a construction machine concerning a 1st embodiment of the present invention. It is a perspective view which shows the structure of the headlamp shown in FIG. It is a figure which shows the detection range of the height direction of the millimeter wave radar shown in FIG. It is a block diagram which shows the function structure of the controller for controlling the width | variety of the working apparatus shown in FIG. It is a flowchart which shows the flow of the control processing of the width | variety of the working device by the controller shown in FIG. It is a figure explaining the snow removal operation | work of the wheel loader shown in FIG. 1, and is a figure which shows the positional relationship of a vehicle and an obstruction when a working device is an initial state. It is a figure explaining the snow removal operation | work of the wheel loader shown in FIG. 1, and is a figure which shows the positional relationship of a vehicle and an obstruction when the width change operation | movement of a working device is started. It is a figure explaining the snow removal operation | work of the wheel loader shown in FIG. 1, and is a figure which shows the positional relationship of a vehicle and an obstruction when the width | variety of a working device is shrunk | reduced. It is a figure explaining the snow removal operation | work of the wheel loader which concerns on 2nd Embodiment of this invention, and is a figure which shows the positional relationship of a vehicle and an obstruction when the width change operation | movement of a working device is started. It is a figure explaining the snow removal operation | work of the wheel loader which concerns on 2nd Embodiment of this invention, and is a figure which shows the positional relationship of a vehicle and an obstruction when the width | variety of a working device is reduced.

  EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing the construction machine which concerns on this invention is demonstrated based on figures.

[First Embodiment]
The construction machine according to the first embodiment of the present invention includes, for example, a wheel loader 101 that is an articulated vehicle that is steered when the vehicle is bent near the center as shown in FIG. The wheel loader 101 includes a traveling unit 11 that causes the vehicle to travel.

  The traveling unit 11 includes a pair of front wheels 111 rotatably provided at the front part of the vehicle, a pair of rear wheels 112 provided rotatably at the rear part of the vehicle, and a front part and a rear part of the vehicle. A center joint 113 that is bendably connected via a propeller shaft (not shown), and is connected to the center joint 113 via a propeller shaft, and distributes the power transmitted to the propeller shaft to the left and right wheels 111 and 112. A differential gear (not shown) and a final gear (not shown) for transmitting the power distributed by the differential gear to the wheels 111 and 112 are configured.

  Further, the wheel loader 101 is disposed above the center joint 113 and is disposed in front of the cab 12 on which an operator who drives the vehicle is boarded. The wheel loader 101 is movable so that the width of the vehicle can be changed with respect to the vehicle. The working device 13 is configured to remove snow while projecting to the side of the vehicle. As shown in FIG. 6, the width of the working device 13 means a distance LA from the center of the working device 13 to one side portion of the working device 13 when viewed from the traveling direction of the vehicle.

  Furthermore, although not shown, the wheel loader 101 is disposed coaxially with or near the engine that is a power source of the traveling unit 11 and the working device 13, and is operated by the driving force of the engine to discharge the pressure oil. A hydraulic pump, a control valve 14 (see FIG. 4) for controlling the flow rate and direction of pressure oil discharged from the hydraulic pump, and a controller 15 (see FIG. 4) as a control device for controlling the operation of the vehicle are provided. Each of these devices is stored at the rear of the vehicle.

  In FIG. 1, a working device 13 includes a lift 131 having one end rotatably connected to a front portion of a vehicle, a bell crank 132 rotatably connected to the lift 131, and a vehicle centerline LO (see FIG. 1). 6) and a pivot shaft 134 (see FIG. 6) attached to the distal end portion of the lift 131 via the body portion 133 and a base end portion are attached to the pivot shaft 134, respectively. It includes a pair of blades 135 arranged side by side in the width direction.

  That is, the work device 13 is configured by a rotating snow plow that adjusts the width LA with respect to the vehicle by rotating the blades 135 around the rotating shaft 134. A blade angle sensor 135 </ b> A (see FIG. 4) that detects an angle at which the blade 135 is rotated is attached to the body portion 133. The blade angle sensor 135A is communicatively connected to the controller 15, and the detection result of the blade angle sensor 135A is input to the controller 15.

  In the first embodiment of the present invention, the vehicle center line LO described above means a line segment passing along the traveling direction along the center of the front portion of the vehicle, as shown in FIG. Synonymous with vertical bisector. The rotation angle of the blade 135 indicating the detection result of the blade angle sensor 135A means an angle θ formed by the blade 135 and the center line LO of the vehicle. Each blade 135 can rotate, for example, when the angle θ formed is in the range of 0 ° to 90 ° (0 ° ≦ θ ≦ 90 °).

  In FIG. 1, the working device 13 connects a front portion of the vehicle and a rear end portion of the body portion 133, and a link that holds the rotation shaft 134 and the blade 135 so as to be rotatable in the vertical direction via the body portion 133. It includes a member 136 and a support member 137 that protrudes downward from the lower surface of the body portion 133 to contact the ground and supports the body portion 133 so that each blade 135 does not slide on the ground.

  Further, the working device 13 is connected at both ends to the lift 131 and the front part of the vehicle, and expands and contracts by the pressure oil supplied from the control valve 14 to rotate the lift 131 in the vertical direction (not shown). And a steering cylinder (not shown) that expands and contracts by the pressure oil supplied from the control valve 14 and bends the front part of the vehicle leftward or rightward with the center joint 113 as an axis with respect to the rear part. .

  Further, the working device 13 is connected to the bell crank 132 and the front portion of the vehicle at both ends, and expands and contracts by the pressure oil supplied from the control valve 14 to rotate the rotating shaft 134 and the blade 135 in the vertical direction. A plow cylinder 138 and a blade cylinder 139 that expands and contracts by the pressure oil supplied from the control valve 14 and rotates each blade 135 about the rotation shaft 134 are included. In FIG. 1, only one lift 131, snow plow cylinder 138, and blade cylinder 139 are shown, but a pair of these members is provided on the left and right sides, and redundant description is omitted. Yes.

  In the work device 13 configured as described above, the hydraulic oil in the blade cylinder 139 is returned to the control valve 14 and the blade cylinder 139 is shortened, so that the pair of blades 135 is moved around the rotation shaft 134 in the vehicle. It rotates toward the outer side in the width direction, and the width LA of the working device 13 increases. On the other hand, the hydraulic oil discharged from the hydraulic pump is supplied to the blade cylinder 139 via the control valve 14 and the blade cylinder 139 extends, so that the pair of blades 135 moves around the rotation shaft 134 in the vehicle width direction. And the width LA of the working device 13 is reduced.

  Here, a pair of headlamps 21 that illuminate the operator's field of view by irradiating light in front of the vehicle are respectively attached to both ends of the front end of the wheel loader 101 on the base end side of the lift 131. . For example, as shown in FIG. 2, the headlamp 21 includes a headlight 211 using a light emitting element such as an LED as a light source, a casing 212 in which the headlight 211 is embedded, and a side surface of the front portion of the vehicle. And a stay 214 that holds the housing 212.

  The stay 214 is formed in a substantially L shape that protrudes from the bracket 213 to the side of the vehicle and curves obliquely upward so that the headlight 211 is positioned on the front side of the cab 12. The headlamp 21 is attached to a side portion of the housing 212, and is turned on when the vehicle turns right and left to change the course of the vehicle. An obstacle detection device, for example, a millimeter wave radar 216, which is embedded in a position adjacent to the headlight 211 and detects an obstacle 102 (see FIG. 6) present in the forward direction of the vehicle. Yes.

  The millimeter wave radar 216 is a device that is connected to the controller 15 for communication, transmits millimeter wave radio waves to the front of the vehicle, receives the reflected waves, and detects an object in front. As shown in FIG. 6, the left and right millimeter wave radars 216 of the vehicle have their horizontal detection ranges AL and AR overlapping each other, and these overlapping ranges are more left and right than the width of the road on which the vehicle travels. Wide in the direction.

  Further, as shown in FIG. 3, the installation position and the installation direction of each of the left and right millimeter wave radars 216 of the vehicle are such that an obstacle 102 such as a power pole on the roadside or a road sign enters the detection range AH in the height direction. It is set for a long distance away from the vehicle. With such a setting, each millimeter wave radar 216 can detect the obstacle 102 located in front of the vehicle separately from a windrow whose height is lower than that of a utility pole, road sign, etc. The position and distance of the obstacle 102 with respect to the vehicle can be acquired.

  For example, the controller 15 is not shown, but includes a CPU (Central Processing Unit) that performs various calculations for controlling the overall operation of the vehicle, and a ROM (Read Only Memory) that stores a program for executing calculations by the CPU. It comprises hardware including a storage device such as an HDD (Hard Disk Drive) and a RAM (Random Access Memory) that serves as a work area when the CPU executes a program.

  In such a hardware configuration, a program stored in a recording medium such as a ROM, an HDD, or an optical disk (not shown) is read into the RAM, and the program (software) and the hardware are operated by operating under the control of the CPU. In cooperation, a functional block for realizing the function of the controller 15 is configured as shown in FIG.

  By the way, in order to remove the windrow formed on the side of the road, as shown in FIG. 6, when the vehicle travels on the road with the width LA of the work device 13 set large, the work device 13 becomes the shoulder. There is a possibility of contact with an obstacle 102 such as a power pole or road sign and damage. Therefore, in the first embodiment of the present invention, the controller 15 controls the width LA of the work device 13 by rotating each blade 135 around the rotation shaft 134 according to the detection result of the millimeter wave radar 216. It is configured as follows.

  Hereinafter, a configuration showing specific functions of the controller 15 that characterize the first embodiment of the present invention will be described in detail with reference to FIG.

  As shown in FIG. 4, the controller 15 includes a storage unit 151, a width calculation unit 152, an obstacle separation distance calculation unit 153, a determination unit 154, and a width change unit 155. The storage unit 151 stores in advance dimensional information of the working device 13 such as the diameter of the rotating shaft 134 and the length of the blade 135. The storage unit 151 is realized by a recording medium such as a ROM, an HDD, or an optical disk (not shown).

  The width calculation unit 152 calculates the width LA of the working device 13 based on the rotation angle θ of the blade 135 detected by the blade angle sensor 135A and the dimensional information of the working device 13 stored in the storage unit 151. . Therefore, the width calculation unit 152 functions as a width acquisition unit that acquires the width LA of the current working device 13.

  Based on the detection result of the millimeter wave radar 216, the obstacle separation distance calculation unit 153 is a distance from the center of the work device 13 to the obstacle 102 as seen from the traveling direction of the vehicle, that is, the obstacle 102 to the vehicle in FIG. The obstacle separation distance LB indicating the length of the line segment perpendicular to the center line LO is calculated.

  The determination unit 154 compares the width LA of the work device 13 calculated by the width calculation unit 152 with the obstacle separation distance LB calculated by the obstacle separation distance calculation unit 153, and the width LA of the work device 13 is determined to be an obstacle. It is determined whether or not it is larger than the separation distance LB. The width changing unit 155 changes the width LA of the work device 13 so that the width LA of the work device 13 is reduced when the determination unit 154 determines that the width LA of the work device 13 is larger than the obstacle separation distance LB. Control.

  Next, the control processing of the width LA of the work device 13 by the controller 15 according to the first embodiment of the present invention will be described in detail with reference to the flowchart of FIG.

  First, when the operator operates a start button (not shown) that gets on the cab 12 of the wheel loader 101 and starts snow removal work, the controller 15 rotates the pair of blades 135 outward in the vehicle width direction of the vehicle. By sending a command to enlarge the width LA of the working device 13 indicating the control command to the control valve 14 and driving the rear wheel 112 of the traveling unit 11, the vehicle moves the working device 13 to the side as shown in FIG. Drive on the road overhanging.

  Then, the controller 15 inputs the detection result of the millimeter wave radar 216 (step (hereinafter referred to as S) 501), and determines whether or not the obstacle 102 exists in front of the traveling direction of the vehicle (S502). . At this time, if the controller 15 determines that there is no obstacle 102 ahead of the traveling direction of the vehicle (S502 / NO), the processing from S501 is repeated.

  On the other hand, as shown in FIG. 7, when the obstacle 102 enters the detection ranges AL and AR of the millimeter wave radar 216, the controller 15 determines that the obstacle 102 exists in front of the traveling direction of the vehicle (S502 / YES). ), The obstacle separation distance calculation unit 153 of the controller 15 acquires the position and distance of the obstacle 102 with respect to the vehicle from the detection result of the millimeter wave radar 216, and the obstacle separation distance LB from the position and distance of these obstacles 102. Is calculated (S503).

  Next, the width calculation unit 152 of the controller 15 refers to the detection result of the blade angle sensor 135A and the storage content of the storage unit 151, and stores the rotation angle θ of the blade 135 detected by the blade angle sensor 135A and the storage unit 151. The width LA of the work device 13 is calculated from the stored dimension information of the work device 13 (S504).

  Then, the determination unit 154 of the controller 15 compares the width LA of the working device 13 calculated by the width calculation unit 152 with the obstacle separation distance LB calculated by the obstacle separation distance calculation unit 153 (S505). It is determined whether or not the width LA of the device 13 is larger than the obstacle separation distance LB, that is, whether or not the working device 13 contacts the obstacle 102 (S506).

  At this time, when the determination unit 154 determines that the width LA of the work device 13 is larger than the obstacle separation distance LB, that is, the work device 13 contacts the obstacle 102 (S506 / YES), the width change unit of the controller 15 155 transmits to the control valve 14 a command to reduce the width LA of the working device 13 indicating a control command for rotating the pair of blades 135 inward in the vehicle width direction of the vehicle (S507), and the processing from S503 is repeated. .

  As a result of the processing of S507, as shown in FIG. 8, each blade 135 rotates around the rotation shaft 134 to a position where the working device 13 does not come into contact with the obstacle 102, and the width LA of the working device 13 is reduced. . On the other hand, in S506, when the determination unit 154 determines that the width LA of the work device 13 is not larger than the obstacle separation distance LB, that is, the work device 13 does not contact the obstacle 102 (S506 / NO), the controller 15 Determines whether an end button (not shown) for ending the snow removal operation has been operated by the operator in the cab 12 (S508).

  At this time, if the controller 15 determines that the end button has not yet been operated by the operator in the cab 12 (S508 / NO), the processing from S501 is repeated. On the other hand, in S508, when the controller 15 determines that the end button has been operated by the operator in the cab 12 (S508 / YES), the controller 15 according to the first embodiment of the present invention controls the width LA of the work device 13. Exit.

  According to the wheel loader 101 according to the first embodiment of the present invention configured as described above, when performing snow removal work on a road where a large number of obstacles 102 such as utility poles and road signs exist on both sides, Even if a special device such as a marker used in the technology is not installed on the road, the millimeter wave radar 216 detects the obstacle 102 positioned in front of the traveling direction of the vehicle. Since the size is automatically reduced, it is possible to prevent the working device 13 from coming into contact with the obstacle 102 in advance. Therefore, 1st Embodiment of this invention can perform snow removal work efficiently, without damaging the working device 13, even if it is a narrow road, such as a road in an urban area.

  Further, in the wheel loader 101 according to the first embodiment of the present invention, the work device 13 is composed of a rotating snow plow including a rotating shaft 134 and a pair of blades 135, so that the vehicle is on the road. Prior to traveling and approaching the obstacle 102, each blade 135 rotates inward in the vehicle width direction of the vehicle around the rotation shaft 134, so that each blade 135 is reduced during the reduction of the work device 13. The snow removal operation can be continued as it is without missing the pushed snow. Thereby, it can suppress that a new windrow generate | occur | produces on a road.

[Second Embodiment]
The second embodiment of the present invention differs from the first embodiment described above in that the working device 13 according to the first embodiment has a pair of blades 135 having a rotating shaft 134 as shown in FIGS. The working device 23 according to the second embodiment is shown in FIGS. 9 and 10, whereas the working device 23 according to the second embodiment is configured by a rotating snow plow that adjusts the width LA with respect to the vehicle by turning around. As in the first embodiment, a pair of guide plates 231 that are spaced apart from each other in the vehicle width direction of the vehicle and guide the snow removed from the snow to the center side in the vehicle width direction of the vehicle and the pair of guide plates 231 A pair of blades 232 provided so as to be slidable via the blade cylinder 139 and arranged so as to expand in the vehicle width direction of the vehicle, and disposed on the center side of these blades 232, and lifted instead of the body portion 133 131 tip Is that made up of sliding snow plow comprising a bucket 233 attached to.

  In the work device 23 configured as described above, the hydraulic oil discharged from the hydraulic pump is supplied to the blade cylinder 139 via the control valve 14, and the blade cylinder 139 extends, so that the pair of blades 232 is mounted on the vehicle. It slides toward the outer side in the width direction, and the width LA of the work device 23 is enlarged. On the other hand, when the hydraulic oil in the blade cylinder 139 is returned to the control valve 14 and the blade cylinder 139 is shortened, the pair of blades 232 slides inward in the vehicle width direction of the vehicle, and the width LA of the work device 23 is reduced. Shrinks. Since the other configurations of the second embodiment are the same as those of the first embodiment described above, the same or corresponding parts as those of the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  According to the wheel loader 101 according to the second embodiment of the present invention configured as described above, the same effects as those of the first embodiment described above can be obtained, and the vehicle can be formed on both sides of the road while the vehicle is traveling. The windrow can be broken by each blade 232 and the broken snow can be collected on the center side of the road by the guide plate 231. Then, when the vehicle travels again on the road, the snow accumulated on the center side of the road can be easily accommodated in the bucket 233 of the work device 23 and transported to the accumulation site. Windrows can be removed efficiently even on roads where there is.

  In addition, this embodiment mentioned above was described in detail in order to demonstrate this invention easily, and is not necessarily limited to what is provided with all the demonstrated structures. Further, a part of the configuration of an embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of an embodiment.

DESCRIPTION OF SYMBOLS 11 ... Traveling part, 12 ... Cab, 13, 23 ... Working device, 14 ... Control valve, 15 ... Controller (control device), 21 ... Headlight 101 ... Wheel loader (construction machine), 102 ... Obstacle, 111 ... Front wheel 112 ... Rear wheel 113 ... Center joint 131 ... Lift, 132 ... Bell crank, 133 ... Body part, 134 ... Rotating shaft, 135, 232 ... Blade, 135A ... Blade angle sensor, 136 ... Link member, 137 ... Support member, 138... Snow plow cylinder, 139. Blade cylinder 151... Storage unit, 152. Headlight, 212 ... Case, 213 ... Bracket, 214 ... Stay, 215 ... Direction light, 216 ... Mi Re-wave radar (obstacle detection device)
231 ... guide plate, 233 ... bucket

Claims (3)

A construction machine comprising a movable working device provided with a width that can be changed with respect to a vehicle, and removing the snow while the working device projects to the side of the vehicle,
An obstacle detection device for detecting an obstacle present in the forward direction of the vehicle;
A control device for controlling a width of the working device indicating a distance from a center of the working device to one side portion of the working device as seen from a traveling direction of the vehicle according to a detection result of the obstacle detecting device; Prepared,
The controller is
A width acquisition unit for acquiring the width of the current working device;
Based on the detection result of the obstacle detection device, an obstacle separation distance calculation unit that calculates an obstacle separation distance indicating a distance from the center of the work device to the obstacle as viewed from the traveling direction of the vehicle;
The width of the working device acquired by the width acquisition unit is compared with the obstacle separation distance calculated by the obstacle separation distance calculation unit, and whether the width of the working device is larger than the obstacle separation distance. A determination unit for determining whether or not,
A width changing unit that changes the width of the work device so that the width of the work device is reduced when the width of the work device is determined to be larger than the obstacle separation distance by the determination unit. A featured construction machine. The construction machine according to claim 1,
The working device is:
A rotating shaft disposed in the center of the vehicle in the vehicle width direction;
A base end portion is attached to each of the rotating shafts, and includes a pair of rotating snow plows including a pair of blades arranged side by side in the vehicle width direction of the vehicle,
The snow plow increases the width by rotating the pair of blades around the rotation shaft toward the outside in the vehicle width direction of the vehicle, and the pair of blades is rotated around the rotation shaft. A construction machine characterized in that the width of the vehicle is reduced by turning inward in the vehicle width direction of the vehicle. The construction machine according to claim 1,
The working device is:
A pair of guide plates that are spaced apart from each other in the vehicle width direction of the vehicle and guide the snow removed from the snow to the center side in the vehicle width direction of the vehicle;
Each of the pair of guide plates is slidably provided, and includes a slide type snow plow including a pair of blades arranged to expand in the vehicle width direction of the vehicle,
The snow plow expands the width by sliding the pair of blades outward in the vehicle width direction of the vehicle, and slides the pair of blades inward in the vehicle width direction of the vehicle. Construction machinery characterized by shrinking width.