JP5071298B2 - Construction machinery - Google Patents

Description

  The present invention relates to a construction machine.

  Conventionally, for example, in order to protect the operator seated in the driver's seat when the fuselage falls due to ground collapse, etc., a pillar is arranged around the driver's seat and a roof is attached to the upper end of each pillar A so-called canopy construction machine is known (see, for example, Patent Documents 1 and 2). In this construction machine, various types of work such as excavation and crushing can be performed by attaching various attachments such as a bucket, a breaker, and a crusher to the tip of an arm connected to the boom.

  Here, in a construction machine with a canopy structure in which the front of the driver's seat is opened, a crushing piece may fly to the driver's seat side during crushing work, so a protective cover is required to protect the operator It becomes.

Patent Document 3 describes a construction machine provided with a protective cover for protecting an operator's feet. Patent Document 4 protects the front of the operator by locking the lower end of a protective sheet made of a transparent material having flexibility and wound in a roll shape to the vehicle body side. A hydraulic excavator is described.
JP 2000-233701 A JP 2004-268907 A JP 2001-90116 A Japanese Patent Laid-Open No. 9-60042

  However, since the construction machine described in Patent Document 3 has a structure that protects only the operator's feet, in the case where a shredded piece comes to the upper position of the driver's seat, it is not possible to ensure the safety of the operator. It was enough.

  Further, in the hydraulic excavator described in Patent Document 4, a protective cover is obtained by engaging a hook member provided on a handlebar at a lower end of the protective cover with an upper end of a gate-shaped frame provided in front of the driver's seat. I am trying to install. In such a configuration of the protective cover, when the boom is driven to the driver's seat side and lifted, there is a risk that the boom and the protective cover may interfere with each other. There is a need.

  However, when the frame is disposed closer to the driver's seat, there is a problem that the operation space of the operation lever disposed between the frame and the driver's seat becomes narrower and the operability is deteriorated. As another issue, in this excavator car, when the operator seated in the driver's seat looks obliquely downward, both the handlebar and the frame enter the field of view and the field of view narrows, so that the work situation can be visually confirmed. There is a risk of getting hard.

  The present invention has been made in view of the above points, and its purpose is to protect the operator from the crushed pieces generated during the crushing operation while ensuring sufficient visibility of the operator, and to secure an operation space for the operation lever. It is another object of the present invention to provide a construction machine that can prevent the boom from interfering with a protective cover when the boom is driven toward the driver's seat.

  In order to achieve the above-described object, the present invention secures and operates the operator's field of view by appropriately setting the relative positions of the upper and lower front guards while protecting the front of the operator with the upper and lower front guards. The lever operating space can be secured.

  Specifically, the present invention is directed to a construction machine in which an upper swing body is rotatably mounted on a lower traveling body and a driver's seat is provided on the upper swing body, and the following solution is taken.

That is, the invention of claim 1 is a front guard that is disposed in front of the driver's seat and protects a lower position of the driver's seat;
An upper front guard disposed above the lower front guard and protecting the upper position of the driver seat;
The lower and upper front guards have a protective plate that allows an operator seated in the driver's seat to visually recognize the front, and a protective frame that surrounds the outer periphery of the protective plate,
The upper front guard is disposed closer to the driver seat than the lower front guard, and the boundary position between the lower front guard and the upper front guard is visually recognized from the viewpoint position of the operator seated on the driver seat. In this case, the upper frame that forms the protective frame of the lower front guard and the lower frame that forms the protective frame of the upper front guard are arranged so as to overlap each other.

  In the first aspect of the invention, the lower front guard is disposed in front of the driver seat, and the upper front guard is disposed at a position above the lower front guard and closer to the driver seat. The lower and upper front guards have a transparent protective plate and a protective frame surrounding the outer peripheral edge of the protective plate. When the boundary position between the lower front guard and the upper front guard is visually recognized from the viewpoint position of the operator seated in the driver's seat, the lower frame forming the upper front guard protective frame and the upper front guard protective frame. The frames overlap each other.

  As described above, the lower front guard is disposed at a position where the operation space of the operation lever can be sufficiently secured, and the upper front guard is disposed closer to the driver's seat than the lower front guard. It is possible to avoid interference between the boom and the upper front guard when lifted to the driver's seat side.

  Further, when the operator seated in the driver's seat visually recognizes the boundary position between the upper and lower front guards, the upper frame of the lower front guard and the lower frame of the upper front guard overlap each other. Since only the lower frame of the upper front guard can enter the field of view, a sufficient field of view can be secured, which is advantageous in appropriately confirming the work situation.

The invention of claim 2 is the invention according to claim 1,
A roof disposed above the driver seat;
A front canopy post disposed on the left or right side in front of the driver's seat and supporting the front side of the roof;
A rear canopy post disposed behind the driver seat and supporting the rear side of the roof;
Of the left side or right side frame forming the protective frame of the lower front guard, the frame on the side where the front canopy post is disposed is provided with a lower fastening member for fastening and fixing to the front canopy post,
Of the left and right ends of the upper frame that forms the protective frame of the upper front guard, an upper fastening member for fastening and fixing to the roof is provided at the end on the side where the front canopy post is disposed, while the other The end portion is provided with a locking member for movably locking with respect to the roof.

  In the invention of claim 2, the roof supported by the front canopy support column and the rear canopy support column is disposed above the driver's seat. The lower front guard is fastened and fixed to the front canopy support via the lower fastening member. In addition, the side end of the front canopy column on the upper front guard is fastened and fixed to the roof via the upper fastening member, and the other end is movably locked to the roof via the locking member. .

  With such a configuration, even if the machine body of the construction machine vibrates while properly holding the upper and lower front guards against the front canopy column and the roof, the upper front guard protective plate is damaged by the vibration. Can be suppressed.

  Specifically, when the left and right ends of the upper frame of the upper front guard are fastened and fixed to the roof, when the vibration transmitted to the front canopy post due to the vibration of the fuselage is transmitted to the upper front guard via the roof, Since the amplitude of the upper frame is larger at the other end than at the end where the front canopy support is disposed, the protective plate may be damaged due to an excessive bending moment applied to the other end.

  In contrast, in the present invention, since the other end of the upper frame of the upper front guard is movably locked to the roof, even if vibration is transmitted from the roof to the upper front guard, The other end is moved relative to the roof, so that an excessive bending moment is not applied, and the protection plate can be prevented from being damaged.

The invention of claim 3 is the invention according to claim 1 or 2,
The upper front guard is detachably attached to the lower front guard.

  In the invention of claim 3, the upper front guard is detachably attached to the lower front guard. Thereby, a construction machine can be used by removing the upper front guard according to the application. In other words, in a work environment in which crushed pieces fly only at the feet, the air permeability of the driver's seat and work visibility can be ensured by removing the upper front guard and performing the crushed work. Also, if there is a risk that the fragments will fly up to the upper position of the driver's seat, or in an environment where the earth and sand may fall from above by excavating the soil above the driver's seat, operate with the upper front guard attached. By completely protecting the front of the seat, the safety of the operator can be sufficiently ensured.

  According to the present invention, by disposing the upper front guard at a position closer to the driver's seat than the lower front guard while disposing the lower front guard at a position where the operation space of the operation lever can be sufficiently secured, Interference between the boom and the upper front guard can be avoided when the boom is lifted to the driver's seat side.

  Further, when the operator seated in the driver's seat visually recognizes the boundary position between the upper and lower front guards, the upper frame of the lower front guard and the lower frame of the upper front guard overlap each other. Since only the lower frame of the upper front guard can enter the field of view, a sufficient field of view can be secured, which is advantageous in appropriately confirming the work situation.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature and is not intended to limit the present invention, its application, or its use.

  FIG. 1 is a side view showing a configuration of a construction machine according to an embodiment of the present invention, FIG. 2 is a perspective view when the upper swing body is viewed from an oblique rear, and FIG. 3 is a view when the upper swing body is viewed from an oblique front. FIG. As shown in FIG. 1, this construction machine 1 is a canopy-spec small excavator, a so-called mini excavator, and is mounted on a lower traveling body 3 on which crawlers 2 and 2 are mounted, and on the lower traveling body 3 so as to be turnable. The upper revolving body 4 is provided. And it is comprised in the back small turning type that the turning radius of the rear end of the upper turning body 4 is substantially contained within the vehicle width of the lower traveling body 3.

  On the upper turning body 4, an operation space A for arranging the driver's seat 5, the control box 17 and the like is provided. On the right side of the operation space A, an equipment space for storing hydraulic equipment and tanks is provided and covered with an equipment cover 6. In addition, an engine storage space for storing the engine is provided behind the driver seat 5 and is covered with an engine cover 7. A fuel tank (not shown) is provided on the left side of the engine cover 7 and is covered with the fuel tank cover 8. The fuel tank cover 8 is formed with a fuel filler port 8a so that fuel can be supplied into the fuel tank through the fuel filler port 8a.

  The left front of the driving space A is opened as an entrance for an operator to get on and off the driver's seat 5, and the floor F is provided with an uneven portion for preventing slipping and mud adhering to the shoe sole. A stepped step surface 9 is formed.

  A connection bracket 14 is provided on the front side of the upper swing body 4 to connect a front attachment 10 that can be replaced depending on the work application. A swing bracket 15 that can rotate the front attachment 10 around a vertical axis 14 a is coupled to the connection bracket 14.

  The front attachment 10 includes a boom 11, an arm 12, a bucket 13, and a boom cylinder 11a, an arm cylinder 12a, and a bucket cylinder 13a for driving the boom 11, and a base end portion of the boom 11 is connected to a swing bracket 15. Yes. Here, when the boom cylinder 11a is extended and contracted, the boom 11 can be switched from a state where the boom 11 is tilted forward to a state where the boom 11 is driven to the driver's seat 5 side and lifted. The swing bracket 15 swings in the left-right direction by extending and retracting a swing cylinder (not shown).

  Control boxes 17 for performing various controls are provided on the left and right sides of the driver seat 5. An operation lever 18 for driving the front attachment 10 is provided at the front end of the control box 17.

  An operation lever 19 extending upward from the floor surface F of the upper swing body 4 is provided in front of the driver seat 5. By operating this operation lever 19, the lower traveling body 3 can be moved forward or backward.

  Further, surrounding the driver's seat 5, a front canopy post 21 is on the right front side, a rear canopy post 22 is on the right rear side, and a lateral canopy post is on the left side of the driver's seat 5 (side of the entrance / exit). 23 are erected. Since the front canopy support column 21, the rear canopy support column 22, and the lateral canopy support column 23 are arranged at the positions described above, the support column 5 is opened without the support column on the left side of the driver's seat 5. This is advantageous in eliminating the feeling of pressure in space A.

  The front canopy post 21 is formed of a round pipe whose upper side is inclined rearward, and a lower end portion thereof is fixed to the floor surface F of the upper swing body 4. The rear canopy column 22 is formed of a square pipe having a flat cross section, and a lower end portion thereof is fixed to the driver seat 5 side of the device cover 6. The lateral canopy support 23 is formed of a square pipe having a flat cross section, and a lower end portion thereof is fixed to the floor surface F of the upper swing body 4. A roof 30 is attached to the upper end of each of the front canopy support 21, the rear canopy support 22, and the lateral canopy support 23 to protect the operator against falling objects from overhead. It supports so that it may arrange | position above the seat 5. FIG.

  The roof 30 is formed by a plate-like connecting plate 31 that is laid substantially horizontally across the upper ends of the rear canopy support post 22 and the lateral canopy support post 23, and a round pipe formed in a U-shape, Both end portions are provided with front and rear canopy beams 32 a and 32 b connected to the upper ends of the rear canopy column 22 and the lateral canopy column 23, and a roof body 33.

  The front canopy beam 32a projects forward from the connecting plate 31 and is held substantially horizontally. On the other hand, the rear canopy beam 32b protrudes rearward from the connecting plate 31 and is held substantially horizontally. The front-side canopy beam 32a and the rear-side canopy beam 32b constitute a square-shaped canopy beam 32 surrounding the driver's seat 5. Further, a connecting bracket 34 to which the upper end portion of the front canopy support column 21 is connected is provided in front of the right side of the canopy beam 32. The connecting bracket 34 is also used for fastening and fixing to an upper fastening member 53 of the upper front guard 50 described later.

  The roof body 33 is resin-molded according to the outer peripheral shape of the canopy beam 32, and is placed on the canopy beam 32 and fastened and fixed with fastening bolts (not shown) to cover the upper side of the driver's seat 5. Are arranged as follows. As a result, the operator can be protected from falling objects, sunlight, rainwater, etc. from overhead.

  In front of the driver's seat 5, a lower front guard 40 that is disposed in front of the movable range of the operation lever 19 and protects the lower position of the driver's seat 5, and the driver's seat 5 above the lower front guard 40. An upper front guard 50 is disposed to protect the upper position of the upper side guard.

  FIG. 4 is a perspective view showing the configuration of the lower front guard. As shown in FIG. 4, the lower front guard 40 includes a transparent protective plate 41 that allows an operator seated in the driver's seat 5 to visually recognize the front, and a protective frame 42 that surrounds the outer peripheral edge of the protective plate 41. ing.

  The protective plate 41 is formed of substantially rectangular glass, acrylic, or the like. Further, the protective frame 42 is connected so as to straddle the upper frame 42a, the left frame 42c, the right frame 42d, and the left frame 42c and the right frame 42d that form a round pipe that is bent in a U shape with an opening on the lower side. It consists of a lower frame 42b. The protective plate 41 is fitted and attached in a substantially rectangular mounting space surrounded by the upper frame 42a, the lower frame 42b, the left frame 42c, and the right frame 42d forming the protective frame 42.

  Specifically, as shown in FIG. 5, seven mounting brackets 61 projecting toward the mounting space side of the protective plate 41 are provided on the inner peripheral edge of the protective frame 42 at intervals in the circumferential direction. . Each of the mounting brackets 61 is formed with a through hole 61a. Further, a through hole 41 a is formed in the protective plate 41 at a position corresponding to the through hole 61 a of the mounting bracket 61.

  The protective plate 41 is disposed on the front side of the mounting bracket 61 via a spacer 62a. A retainer 62 having a cylindrical portion fitted in the through hole 41 a of the protective plate 41 and a flange portion abutting against the front surface of the protective plate 41 is disposed on the front side of the protective plate 41. Then, the fastening bolt 63 is inserted through the through hole 61a of the mounting bracket 61 via the spacer 63a, and the screw portion at the tip thereof is fastened to the retainer 62.

  In this way, the fastening plate 63 is fastened to the retainer 62, and the protection plate 41 and the mounting bracket 61 are held between the retainer 62 and the fastening bolt 63, so that the protection plate 41 is attached to the protection frame 42. It becomes.

  The lower ends of the left frame 42c and the right frame 42d forming the protective frame 42 are formed so as to extend downward after being bent toward the driver's seat 5, respectively, and fixed to the floor surface F of the driving space A at the lower ends. A leg portion 45 is provided. By fixing the leg portion 45 to the floor surface F with fastening bolts, the lower front guard 40 is arranged to stand in front of the driver's seat 5.

  A handle 43 is provided at an upper position of the left frame 42c for an operator to hold when getting on and off. The right frame 42d is provided with a lower fastening member 44 for fastening and fixing to the front canopy column 21.

  FIG. 6 is a plan view showing the configuration of the lower fastening member. As shown in FIG. 6, the lower fastening member 44 includes a fastening bracket 44a attached to the upper end portion of the right frame 42d, and a U-shaped bolt 44b bent in a U shape and having male screw portions formed at both ends. And.

  The fastening bracket 44a is formed with two through holes spaced in the left-right direction, and the male threaded portion at the tip of the U-shaped bolt 44b is inserted through each of the through holes. Here, with the curved portion of the U-shaped bolt 44b fitted into the outer peripheral surface of the front canopy support column 21, the male screw portion at the tip of the U-shaped bolt 44b is inserted into the through-hole of the fastening bracket 44a, and the U-shaped bolt 44b. Is fastened by the fastening nut 44c, whereby the right frame 42d of the lower front guard 40 is fastened and fixed to the front canopy column 21.

  FIG. 7 is a side view showing a state in which the lower and upper front guards are attached via a connecting plate. As shown in FIG. 7, a connecting member 48 is attached to the upper frame 42 a forming the protective frame 42 with an interval in the left-right direction. The connecting member 48 is formed with a screw hole, and a front guard connecting plate 65 that connects the lower front guard 40 and the upper front guard 50 is detachably fastened by a fastening bolt 48a.

  The front guard connecting plate 65 extends upward and is bent so as to incline backward. The upper front guard 50 is connected to the upper end of the front guard connecting plate 65. Accordingly, the upper front guard 50 is disposed closer to the driver's seat 5 than the lower front guard 40 while the lower front guard 40 is disposed at a position where the operation space of the operation lever 19 can be sufficiently secured. It is possible to prevent the boom 11 and the upper front guard 50 from interfering when the boom 11 is lifted to the driver's seat 5 side.

  FIG. 8 is a perspective view showing the configuration of the upper front guard. As shown in FIG. 8, the upper front guard 50 has a substantially rectangular transparent protective plate 51 and a protective frame 52 that surrounds the outer peripheral edge of the protective plate 51. Specifically, the protective frame 52 is formed of a round pipe bent into a square shape, and is substantially rectangular surrounded by an upper frame 52a, a lower frame 52b, a left frame 52c, and a right frame 52d. A protective plate 51 is fitted in the mounting space having a shape.

  Seven mounting brackets 61 projecting toward the mounting space side of the protective plate 51 are provided on the inner peripheral edge of the protective frame 52 at intervals in the circumferential direction. The configuration for attaching the protective plate 51 to the mounting bracket 61 is the same as the configuration described in the lower front guard 40, and therefore the following description is omitted.

  The lower frame 52b forming the protective frame 52 is attached with a connecting member 58 that protrudes downward at intervals in the left-right direction. The connecting member 58 has a notch, and the fastening bolt inserted through the notch is fastened to a screw hole formed in the upper end of the front guard connecting plate 65, so that the upper front guard 50 is connected to the upper end of the front guard connecting plate 65.

  As shown in FIG. 7, when the upper front guard 50 is attached to the lower front guard 40 via the front guard connecting plate 65, the lower front guard 50 is moved from the viewpoint position P of the operator seated on the driver's seat 5. When the boundary position between the guard 40 and the upper front guard 50 is visually confirmed, the upper frame 42a forming the protective frame 42 of the lower front guard 40 and the lower frame 52b forming the protective frame 52 of the upper front guard 50 are over each other. It is arranged to wrap.

  With such a configuration, since only the lower frame 52b of the upper front guard 50 can enter the field of view of the operator seated in the driver's seat 5, a sufficient field of view can be secured and the work situation can be confirmed appropriately. This is advantageous.

  Here, since the lower front guard 40 and the upper front guard 50 are detachably attached via the front guard connecting plate 65, the upper front guard 50 is removed according to the application and the construction machine 1 is used. be able to. That is, in the case where there is a possibility that the crushed pieces may fly up to the upper position of the driver's seat 5 or in an environment where the sediment may fall from above by excavating the sediment above the driver's seat 5, as shown in FIG. By attaching the upper front guard 50 to the front and completely protecting the front of the driver's seat 5, the operator's safety can be sufficiently ensured.

  On the other hand, in a work environment in which crushed pieces fly only at the feet, by removing the upper front guard 50 and carrying out the crushed work as shown in FIG. 9, the air permeability and work visibility of the driver's seat can be ensured.

  An upper fastening member 53 for fastening and securing the protective frame 52 to the roof 30 is provided at the right end portion of the upper frame 52a forming the protective frame 52. Further, a locking member 54 for locking the protective frame 52 to the canopy beam 32 of the roof 30 is provided at the left end of the upper frame 52a.

  FIG. 10 is a side view showing the configuration of the upper fastening member. As shown in FIG. 10, the upper fastening member 53 is fastened to the front surface of the proximal bracket 53a by a proximal end bracket 53a that protrudes forward from the upper frame 52a and whose distal end is bent upward, and a fastening bolt 53c. And a fastening bracket 53b whose portion is bent rearward. Then, both the members are fastened by the fastening bolts 34a in a state where the bent surface of the fastening bracket 53b and the upper surface of the connection bracket 34 attached to the right front of the canopy beam 32 are overlapped. Accordingly, the right end portion of the upper front guard 50 is fastened and fixed to the roof 30 by the fastening bolt 34a.

  FIG. 11 is a side view showing the configuration of the locking member. As shown in FIG. 11, the locking member 54 is fastened to the rear surface of the base end bracket 54a by the base end bracket 54a protruding upward from the upper frame 52a and the fastening bolt 55, and the upper end is bent rearward. A locking bracket 54c having a locking claw 54b extending in a bifurcated manner upward from the bent surface is provided.

  The locking bracket 54c is locked with the front left side of the canopy beam 32 of the roof 30 sandwiched between the two locking claws 54b and 54b. That is, the upper front guard 50 is locked to the roof 30 so that the movement of the locking member 54 in the front-rear direction is restricted and the movement in the vertical direction is allowed.

  Here, since the front canopy support column is not disposed in front of the left side of the canopy beam 32, when the canopy beam 32 vibrates, the left front side tends to have a larger amplitude than the right front side. . In other words, when the left end portion of the upper frame 52a is fastened and fixed by a fastening bolt or the like instead of the locking member 54, the left end portion greatly vibrates in the upper frame 52a following the vibration of the canopy beam 32. There is a possibility that the protective plate 51 may be damaged due to an excessive bending moment.

  In the present invention, in order to solve such a problem, even if the canopy beam 32 of the roof 30 vibrates, the canopy beam 32 and the locking claw 54b of the locking member 54 move relatively in the vertical direction. Therefore, it is possible to prevent the protective plate 51 from being damaged without applying an excessive bending moment to the left end portion of the upper frame 52a of the upper front guard 50.

  As described above, according to the construction machine 1 according to the present embodiment, the lower front guard 50 is disposed on the lower front guard 50 while the lower front guard 40 is disposed at a position where the operation space of the operation lever 19 can be sufficiently secured. By disposing at a position closer to the driver's seat 5 than 40, it is possible to avoid interference between the boom 11 and the upper front guard 50 when the boom 11 is lifted to the driver's seat 5 side.

  Further, when the operator seated in the driver's seat 5 visually recognizes the boundary position between the lower front guard 40 and the upper front guard 50, the upper frame 42a of the lower front guard 40 and the lower frame 52b of the upper front guard 50 Are overlapped with each other, so that only the lower frame 52b of the upper front guard 50 can enter the field of view of the operator and a sufficient field of view can be secured, which is advantageous in appropriately confirming the work situation. .

  As described above, the present invention protects the operator from the crushed pieces generated during the crushing operation while ensuring sufficient visibility of the operator, and drives the boom toward the driver's seat while securing the operation space of the operation lever. Since it is possible to provide a construction machine capable of providing a construction machine that can prevent the boom from interfering with the protective cover, it is extremely useful and has high industrial applicability.

It is a side view which shows the structure of the construction machine which concerns on embodiment of this invention. It is a perspective view when an upper turning body is seen from diagonally rear. It is a perspective view when an upper turning body is seen from diagonally forward. It is a perspective view which shows the structure of a lower front guard. It is a disassembled perspective view which shows the state which attached the protection plate to the protection frame. It is a top view which shows the structure of a lower side fastening member. It is a side view which shows the state which attached the lower side and the upper side front guard via the connection plate. It is a perspective view which shows the structure of an upper front guard. It is a perspective view which shows the state which removed the upper side front guard. It is a side view which shows the structure of an upper side fastening member. It is a side view which shows the structure of a locking member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Construction machine 3 Lower traveling body 4 Upper revolving body 5 Driver's seat 21 Front canopy support 22 Rear canopy support 30 Roof 40 Lower front guard 41 Protection plate 42 Protection frame 42a Upper frame 42c Left frame 42d Right frame 44 Lower fastening member 50 Upper Front Guard 51 Protection Plate 52 Protection Frame 52b Lower Frame 53 Upper Fastening Member 54 Locking Member

Claims (3)

In a construction machine in which an upper swing body is rotatably mounted on a lower traveling body, and a driver's seat is provided on the upper swing body,
A lower front guard disposed in front of the driver's seat and protecting the lower position of the driver's seat;
An upper front guard disposed above the lower front guard and protecting the upper position of the driver seat;
The lower and upper front guards have a protective plate that allows an operator seated in the driver's seat to visually recognize the front, and a protective frame that surrounds the outer periphery of the protective plate,
The upper front guard is disposed closer to the driver seat than the lower front guard, and the boundary position between the lower front guard and the upper front guard is visually recognized from the viewpoint position of the operator seated on the driver seat. And a lower frame forming the protective frame of the upper front guard and the lower frame forming the protective frame of the upper front guard are arranged so as to overlap each other. In claim 1,
A roof disposed above the driver seat;
A front canopy post disposed on the left or right side in front of the driver's seat and supporting the front side of the roof;
A rear canopy post disposed behind the driver seat and supporting the rear side of the roof;
Of the left side or right side frame forming the protective frame of the lower front guard, the frame on the side where the front canopy post is disposed is provided with a lower fastening member for fastening and fixing to the front canopy post,
Of the left and right ends of the upper frame that forms the protective frame of the upper front guard, an upper fastening member for fastening and fixing to the roof is provided at the end on the side where the front canopy post is disposed, while the other A construction machine characterized in that a locking member for movably locking to the roof is provided at the end. In claim 1 or 2,
The construction machine, wherein the upper front guard is detachably attached to the lower front guard.

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