JP2024027935A - working machine - Google Patents

Abstract

An object of the present invention is to provide a working machine that allows a lifting device installed in a limited space to be used in a stable posture. SOLUTION: The rotating body 13 includes a traveling body 11, a rotating body 13, and a working device 14. In the hydraulic excavator 1, which has a driver's cab 31 provided at An opening 33C is formed, and an opening/closing door 331 is provided which rotates in the horizontal direction to open and close the opening 33C. An elevating device 5 is provided for elevating between the decks 34L, 34R and the upper surface portion 33T of the machine room 33. [Selection diagram] Figure 5

Description

TECHNICAL FIELD The present invention relates to a working machine equipped with a lifting device on the side surface of the machine body.

For working machines such as hydraulic excavators, for example, during maintenance work, workers may climb onto the upper surface of the building cover of the revolving structure, so elevating devices such as steps or ladders are installed on the sides of the revolving structure. There are times when I am exposed. In addition, some medium-sized or large-sized working machines with a deck on the revolving body are designed so that the operator passes through the upper surface of the building cover and the deck when entering and exiting the operator's cab. Also in such a working machine, an elevating device for elevating between the upper surface of the building cover and the deck is provided on the side surface of the revolving body.

Since a work machine is equipped with a plurality of various types of equipment, the space for each piece of equipment is limited, and the lifting device is also required to be installed in a limited space. For example, in Patent Document 1, a lifting device consisting of a ladder arranged so as to be able to face the side surface of a revolving structure can be covered by a side cover rotatably attached to a building frame that holds the building cover of the revolving structure. A work machine provided is disclosed. The ladder of the lifting device is attached to another building frame placed in front of the building frame to which the side cover is attached, and is used with the side cover open.

Japanese Patent Application Publication No. 2007-197965

However, in the elevating device described in Patent Document 1, since the ladder is arranged inside the side cover, that is, inside the building cover, it is difficult to install a handrail or the like. Furthermore, when descending from the top of the building cover, the worker or operator must open the side cover from the top of the building cover in an unstable posture.

An object of the present invention is to provide a working machine that allows a lifting device installed in a limited space to be used in a stable posture.

In order to achieve the above object, the present invention includes a self-propelled traveling body, a revolving body rotatably provided with respect to the traveling body, and a working device attached to the revolving body. , the revolving body has a deck extending in the front-rear direction on left and right sides, a driver's cab provided on one side of the working device, and a machine room provided at the rear of the driver's cab. In the machine, an opening for accessing the inside of the machine room is formed in one side of the machine room, and an opening/closing door is provided that rotates in a horizontal direction to open and close the opening. An elevating device is provided on the outer surface of the opening/closing door, and is rotatable in the horizontal direction together with the opening/closing door, and is capable of moving up and down between the deck and the upper surface of the machine room. shall be.

According to the present invention, a lifting device installed in a limited space can be used in a stable posture. Problems, configurations, and effects other than those described above will be made clear by the following description of the embodiments.

1 is an external side view showing an example of the configuration of a hydraulic excavator according to an embodiment of the present invention. FIG. 2 is an enlarged side view showing a portion of the hydraulic excavator shown in FIG. 1 excluding a working device. FIG. 3 is a front view when FIG. 2 is viewed from the front. FIG. 3 is a plan view when FIG. 2 is viewed from above. FIG. 2 is a perspective view showing a configuration example of the elevating device and its surroundings, with the opening/closing door of the machine room closed. FIG. 2 is a perspective view showing an example of the structure of the elevating device and its surroundings, with the opening/closing door of the machine room open. FIG. 2 is a perspective view showing an example of the configuration of a support bracket. FIG. 3 is an enlarged perspective view showing the elevating device and the opening/closing door in an enlarged manner. It is a figure when FIG. 8 is seen from the rear of a revolving structure. FIG. 2 is a perspective view showing an example of the configuration of a fixed portion between the lifting device and the upper surface of the machine room. FIG. 9 is a diagram when FIG. 8 is viewed from the left side of the revolving structure. FIG. 9 is a diagram when FIG. 8 is viewed from above the rotating structure. FIG. 7 is a diagram when FIG. 6 is viewed from above.

Hereinafter, as one aspect of the working machine according to the embodiment of the present invention, a so-called high-post type crawler hydraulic excavator, which is used, for example, to move cargo at a port or separate scrap at a scrap yard, will be described. explain.

<Overall configuration of hydraulic excavator 1>
First, the overall configuration of the hydraulic excavator 1 will be explained with reference to FIGS. 1 to 4.

FIG. 1 is an external side view showing a configuration example of a hydraulic excavator 1 according to an embodiment of the present invention. FIG. 2 is an enlarged side view of the hydraulic excavator 1 shown in FIG. 1, excluding the working device 14. As shown in FIG. FIG. 3 is a front view of FIG. 2 when viewed from the front. FIG. 4 is a plan view of FIG. 2 viewed from above.

The hydraulic excavator 1 includes a self-propelled crawler-type traveling body 11, a post 12 erected on the traveling body 11, a revolving body 13 rotatably provided at the upper end of the post 12, and a revolving body 13. A working device 14 is attached to the center of the front part of the machine to perform various operations.

The traveling body 11 includes a traveling frame 111 serving as a base frame, a pair of crawlers 112L and 112R attached to the left and right sides of the traveling frame 111, and a pair of traveling motors 113 that drive the pair of crawlers 112L and 112R. By rotating the pair of crawlers 112L and 112R in contact with the ground by the driving force of the pair of travel motors 113, the body is moved.

The pair of traveling motors 113 are mounted on the traveling body 11 in correspondence with each of the pair of crawlers 112L, 112R, and are driven independently of each other to independently rotate the pair of crawlers 112L, 112R in forward and reverse directions. Can be done. In addition, in FIG. 1 and FIG. 2, only the left crawler 112L is shown among the pair of crawlers 112L, 112R. Note that the traveling body 11 is "moving forward" when the pair of crawlers 112L and 112R are rotating in the forward direction, and is "moving backward" when the pair of crawlers 112L and 112R are rotating in the reverse direction.

The post 12 extends vertically between the traveling body 11 and the rotating body 13, and is formed in a cylindrical shape (having a circular cross section) to withstand the rotational moment generated when the rotating body 13 turns and stops. . In the hydraulic excavator 1, by providing the post 12, the rotating body 13 is disposed at a higher location than in a model not provided with the post 12. Note that the height of the revolving body 13, that is, the length of the post 12 in the extending direction, can be appropriately set depending on the environment of the work site where the hydraulic excavator 1 is used.

The revolving body 13 houses therein a revolving frame 30 serving as a base frame, a driver's cab 31 in which an operator is seated, a counterweight 32 that maintains a balance with the working device 14 to prevent the aircraft from tipping, and various types of equipment. It includes a machine room 33 and a pair of decks 34L and 34R extending in the front-rear direction on both left and right sides of the revolving frame 30.

Note that since the rotating body 13 turns 360 degrees in the horizontal direction with the central axis of the post 12 as the turning center, the front, back, right, and left directions change depending on the turning position of the rotating body 13. The "facing state" is a state where the front of the driver's cab 31 is facing the forward direction of the traveling body 11 (the state shown in FIGS. 1 to 4), and "the state where the rotating body 13 is facing backward". This is a state in which the front of the driver's cab 31 faces the backward movement direction of the traveling body 11 (a state in which the vehicle has been turned 180 degrees from the state shown in FIGS. 1 to 4).

Furthermore, the front, rear, left, and right directions of the rotating body 13 are defined based on the state in which the rotating body 13 faces forward. Specifically, when the revolving structure 13 is facing forward, the front side of the operator seated in the driver's seat in the operator's cab 31 is defined as the "front" of the revolving structure 13, and the rear side of the operator is defined as the "front" of the revolving structure 13. The operator's left hand side is defined as the "left side" of the revolving structure 13, and the operator's right hand side is defined as the "right side" of the revolving structure 13.

On the rotating frame 30, the driver's cab 31 is provided on the front left side, the counterweight 32 is provided at the rear end, and the machine room 33 is provided between the driver's cab 31 and the counterweight 32. In the present embodiment, the operator's cab 31 is provided on the front left side of the swing frame 30, that is, on the left side of the working device 14 attached to the front center of the swing frame 30. Depending on the case, it may be provided on the right side of the working device 14.

As shown in FIG. 4, the deck 34L on the left side of the rotating frame 30 (hereinafter referred to as "left deck 34L") extends from the front of the driver's cab 31 to the rear end of the machine room 33. Further, the right deck 34R (hereinafter referred to as "right deck 34R") of the rotating frame 30 extends from the front to the rear end of the machine room 33. Each of the pair of decks 34L and 34R has a width along the left and right direction of the revolving body 13 set to a size that allows operators and workers to pass through, and also has a fence 340 to prevent passersby from falling. ing.

As mentioned above, the revolving body 13 is provided on the post 12, and the operator's cab 31 is located at a high place, so that, for example, the hydraulic excavator 1 can be loaded into the hold of a transport ship at a port, unloaded, etc. When sorting or carrying in and out of scrap at a scrap yard at an industrial waste treatment site, an operator in the operator's cab 31 can look down on the work site, providing good visibility.

When an operator boards the operator's cab 31 from the ground or descends from the operator's cab 31 to the ground, as shown in FIG. 1 and FIG. A pair of stairs 114A, 114B is used.

Stairs 114A (hereinafter referred to as "front stairs 114A") arranged in front of the post 12 are used when the revolving body 13 faces forward. On the other hand, the stairs 114B (hereinafter referred to as "rear stairs 114B") arranged on the rear side of the post 12 are used when the revolving body 13 faces rearward.

As shown in FIG. 3, the front staircase 114A extends diagonally upward from the center in the left-right direction of the traveling body 11 toward the right deck 34R side (the opposite side of the operator's cab 31 across the working device 14 in the revolving body 13). There is. On the other hand, the rear staircase 114B extends obliquely upward from the center in the left-right direction of the traveling body 11 toward the left deck 34L side (the left side of the machine room 33 in the rotating body 13). That is, the front stairs 114A and the rear stairs 114B are point symmetrical with respect to the center of rotation of the revolving structure 13. Therefore, when the revolving body 13 turns and faces rearward, the rear stairs 114B extend diagonally upward from the center of the traveling body 11 in the left-right direction toward the right deck 34R.

As shown by the arrow in FIG. 4, when the operator boards the operator's cab 31 with the rotating body 13 facing forward, the operator first climbs the front stairs 114A from the ground. Next, the operator uses the step of the machine room 33 provided on the right side of the working device 14 to climb up to the top surface 33T of the machine room 33, and continues to walk on the top surface 33T of the machine room 33 from right to left. walk. Then, the operator descends onto the left deck 34L using the lifting device 5 provided on the left side of the machine room 33, and walks forward on the left deck 34L until reaching the driver's cab 31.

Note that when the operator descends from the driver's cab 31 to the ground, he or she may follow the opposite route to the route taken when climbing up. Furthermore, when boarding the operator's cab 31 from the ground with the revolving body 13 facing backwards, and when descending from the operator's cab 31 to the ground, the operator's route should be such that the revolving body 13 faces forward. The route is the same as in the state where

In this way, in the hydraulic excavator 1, when the operator boards the operator's cab 31 from the ground and when the operator descends from the operator's cab 31 to the ground, the operator passes through the upper surface 33T of the machine room 33, and therefore the left deck 34L An elevating device 5 for elevating between the upper surface 33T of the machine room 33 and the upper surface 33T of the machine room 33 is provided on the left side of the machine room 33.

Note that when the driver's cab 31 is provided on the right side of the working device 14, the elevating device 5 is provided on the right side of the machine room 33. That is, the elevating device 5 may be provided on the side of the machine room 33 on the driver's cab 31 side. The specific configuration of the lifting device 5 will be described later.

The working device 14 is hydraulically driven, and as shown in FIG. The arm 42 is rotatably attached to the arm 42, and the grapple 43 is rotatably attached to the tip of the arm 42.

The boom 41 is driven by a boom cylinder 41A. The boom cylinder 41A is connected to the rotating frame 30 at one end and to the boom 41 at the other end, and rotates the boom 41 in the vertical direction relative to the rotating body 13 when hydraulic oil flows in and out and the rod expands and contracts. To move (look down).

Arm 42 is driven by arm cylinder 42A. The arm cylinder 42A is connected to the boom 41 at one end and to the arm 42 at the other end, and rotates the arm 42 in the front-rear direction relative to the boom 41 when hydraulic oil flows in and out and the rod expands and contracts. .

The grapple 43 has a plurality of claws 430 (two in FIG. 1), and is a work tool that grasps, for example, wood, rocks, scraps, etc. and moves them to a predetermined location. The grapple 43 is driven by a grapple cylinder 43A. The grapple cylinder 43A is connected to the arm 42 at one end and to the grapple 43 at the other end, and rotates the grapple 43 in the front-back direction with respect to the arm 42 when hydraulic oil flows in and out and the rod expands and contracts. . Furthermore, the grapple 43 has a built-in claw opening/closing cylinder (not shown). The pawl opening/closing cylinder opens and closes the pawl 430 as hydraulic oil flows in and out and the rod expands and contracts.

Note that this grapple 43 can be changed to other working tools, such as a bucket that scoops up earth and sand and lowers it to a predetermined location, or a breaker that excavates bedrock. Thereby, the hydraulic excavator 1 can perform various works including excavation work, crushing work, etc. using work tools suitable for the work contents.

<Configuration of the lifting device 5 and its surroundings>
Next, the configuration of the elevating device 5 and its surroundings will be explained with reference to FIGS. 5 to 13.

First, the configuration of the left side portion 33L of the machine room 33 in which the lifting device 5 is provided will be described with reference to FIGS. 5 to 7.

FIG. 5 is a perspective view showing an example of the structure of the elevating device 5 and its surroundings, with the opening/closing door 331 of the machine room 33 closed. FIG. 6 shows a configuration example of the elevating device 5 and its surroundings, and is a perspective view with the opening/closing door 331 of the machine room 33 open. FIG. 7 is a perspective view showing an example of the structure of the support bracket 6. As shown in FIG.

As shown in FIGS. 5 and 6, an opening 33C for accessing the inside of the machine room 33 is formed in the left side 33L of the machine room 33, and the opening 33C is rotated horizontally to open and close. An opening/closing door 331 is provided.

In this embodiment, as shown in FIG. 6, the opening/closing door 331 rotates toward the front of the rotating body 13 via a hinge member 9 attached to the front side of the opening 33C in the left side 33L of the machine room 33. It opens by moving, and closes by rotating toward the right of the revolving body 13. Note that the width of the opening/closing door 331 is set to a size that does not collide with the fence 340 of the left deck 34L when rotating.

Further, in the present embodiment, the upper end portion of the left side portion 33L of the machine room 33 is curved toward the upper surface portion 33T, so the opening/closing door 331 is formed with a curved upper end portion, but this is not limited to this. It is sufficient that the opening 33C is formed in a shape that matches the shape of the opening 33C.

The elevating device 5 is attached to the outer surface 331A of the opening/closing door 331 via a plurality of (four in this embodiment) support brackets 6, and can rotate together with the opening/closing door 331 in the horizontal direction. As shown in FIGS. 5 and 7, the four support brackets 6 are joined to the outer surface portion 331A of the opening/closing door 331 in two rows each in the vertical and horizontal directions so as to form a rectangular shape.

As shown in FIG. 7, each of the four support brackets 6 has a first plate part 61 extending from the outer surface part 331A along the left deck 34L, and a first plate part 61 extending from both widthwise ends of the first plate part 61 to the left deck 34L side. a pair of second plate portions 62 that hang down towards the left deck 34L side from the tip of the first plate portion 61 in the projecting direction and a third plate portion that connects the pair of second plate portions 62; 63.

The third plate part 63 is located opposite to the outer surface part 331A, and has two bolt holes 630 formed therethrough in the thickness direction, into which a pair of bolts 81 shown in FIG. 5 are inserted. The two bolt holes 630 are lined up at a predetermined interval in the direction in which the pair of second plate portions 62 are lined up (the width direction of the opening/closing door 331). In addition, since the configurations of the four support brackets 6 are all the same, in FIG. and a bolt hole 630.

In this way, the lifting device 5 is attached to the outer surface 331A of the opening/closing door 331 so that it can rotate in the horizontal direction together with the opening/closing door 331. For example, if the hydraulic excavator 1 is a medium-sized hydraulic excavator, Even if the space for installing equipment is limited, there is no need to secure a space for mounting the lifting device 5.

Furthermore, although the elevating device 5 is installed in a limited space where the opening/closing door 331 is attached, for example, there is no need for preparatory operations such as opening and removing the opening/closing door 331 when using the opening/closing door 331. When it is closed, it can be raised and lowered at any time, allowing operators and workers to use it in a stable posture.

Next, the specific configuration of the lifting device 5 will be explained with reference to FIGS. 8 to 13 in addition to FIGS. 5 and 6.

FIG. 8 is an enlarged perspective view showing the elevating device 5 and the opening/closing door 331 in an enlarged manner. FIG. 9 is a diagram when FIG. 8 is viewed from the rear of the revolving structure 13. FIG. 10 is a perspective view showing a configuration example of a fixed portion between the lifting device 5 and the upper surface portion 33T of the machine room 33. As shown in FIG.

The lifting device 5 extends vertically along the outer surface 331A of the opening/closing door 331 and connects a pair of columns 51A, 51B arranged horizontally at a predetermined interval and a pair of columns 51A, 51B. The ladder includes a plurality of steps (in this embodiment, three steps) of rungs 52A, 52B, 52C, and handrails 53A, 53B continuously formed from a pair of support columns 51A, 51B, respectively. ing.

In addition, among the pair of pillars 51A and 51B, one of the pillars disposed on the side of the hinge member 9 will be referred to as a "pillar 51A", and the other pillar will be referred to as a "pillar 51B". Accordingly, the handrail on the one pillar 51A side is referred to as "handrail 53A", and the handrail on the other pillar 51B side is referred to as "handrail 53B".

In addition, since one pillar 51A and handrail 53A and the other pillar 51B and handrail 53B have similar configurations, below, one pillar 51A and handrail 53A will be mainly used as an example. A description of the other support column 51B and handrail 53B will be omitted.

As shown in FIGS. 5, 6, 8, and 9, one of the pillars 51A and the handrail 53A is formed by bending a circular pipe, for example, and is integrally formed. The handrail 53A includes an inclined part 531 that extends obliquely from the upper end of the column 51A toward the door 331, a horizontal part 532 that extends horizontally from the inclined part 531, and a hanging part 533 that hangs down from the horizontal part 532 toward the door 331. and has.

The support column 51A and the hanging portion 533 of the handrail 53A are connected by a pair of connecting members 501 and 502 that are arranged vertically at a predetermined interval. In this embodiment, the pair of connecting members 501 and 502 are formed of circular pipes similar to the support column 51A and the handrail 53A. Note that the pair of connecting members 501 and 502 do not necessarily need to be made of the same material as the support column 51A and the handrail 53A.

Among the pair of connecting members 501 and 502, the lower connecting member 502, which is disposed on the lower side, is located at the lower end of the hanging portion 533 and protrudes beyond the hanging portion 533. An upper mounting plate 54 is provided at the tip of the lower connecting member 502 in the protruding direction to be attached to the mounting bracket 334A on the upper surface portion 33T of the machine room 33.

As shown in FIG. 10, the upper mounting plate 54 has a substantially rectangular shape with its short side extending in the extending direction of the hanging portions 533 of the support column 51A and the handrail 53A, and its long side extending in the width direction of the opening/closing door 331. This is a plate member. In the upper mounting plate 54, a pair of elongated holes 540, which are elongated in the short side direction and into which a pair of bolts (not shown) are inserted, are formed side by side in the long side direction with the lower connecting member 502 in between. .

As shown in FIGS. 6 and 8, a pair of handrails are provided on the upper surface 33T of the machine room 33 when the opening/closing door 331 is closed (the opening/closing door 331 is blocking the opening 33C). A pair of mounting brackets 334A, 334B are fixed at positions corresponding to the positions of 53A, 53B. The pair of mounting brackets 334A and 334B are each formed by bending a rectangular plate member, as shown in FIG. It includes a standing plate part 334β that stands up from the end on the door 331 side, and a reinforcing plate part 334γ that reinforces between the base plate part 334α and the standing plate part 334β.

As shown by the broken line in FIG. 10, through holes penetrating in the thickness direction are formed in the upright plate portion 334β at positions corresponding to the pair of elongated holes 540 of the upper mounting plate 54. A pair of bolts (not shown) are inserted into the elongated hole 540 and the through hole, and the upper mounting plate 54 and the vertical plate portion 334β are fastened, so that the elevating device 5 is moved against the upper surface portion 33T of the machine room 33. Fixed.

The lifting and lowering device 5 is subject to a large downward load due to repeated lifting and lowering by operators, workers, etc., and is therefore prone to distortion and positional displacement in the vertical direction. Therefore, in this embodiment, by forming the elongated hole 540 in the upper mounting plate 54, distortion and positional deviation in the vertical direction in the lifting device 5 can be absorbed, and the connection between the lifting device 5 and the upper surface portion 33T of the machine room 33 can be absorbed. This makes the fixation more secure.

Further, as shown in FIGS. 5, 8, and 11, a lower mounting plate 55 extending along the left deck 34L is provided at the lower end of the support column 51A. The lower mounting plate 55 has a substantially rectangular shape, with its short side extending in the direction of extension of the horizontal portion 532 of the handrail 53 and the pair of connecting members 501, 502, and its long side extending in the width direction of the opening/closing door 331. It is a plate member. A pair of bolt holes into which a pair of bolts are inserted are formed in the lower mounting plate 55 in a row in the long side direction with the support column 51A in between.

As shown in FIGS. 5 and 6, a pair of mounting pedestals 7A and 7B are provided on the left deck 34L at positions corresponding to the positions of the pair of support columns 51A and 51B when the opening/closing door 331 is closed. It is being

As shown in an enlarged view in FIG. 6, the mounting base 7B is formed into a shape with seven faces by deforming a rectangular parallelepiped with six faces, and is mounted on the lower side when the opening/closing door 331 is closed. It includes an upper surface 71 that faces the lower surface of the plate 55, and an inclined surface 72 that slopes diagonally downward (towards the left deck 34L) from the upper surface 71 toward the side opposite to the machine room 33. Note that since both the mounting bases 7A and 7B have the same configuration, a description of the specific configuration of the mounting base 7A side will be omitted.

An insertion hole 71A is formed in the upper surface 71 at a position corresponding to a pair of bolt holes in the lower mounting plate 55. A pair of bolts are inserted into the bolt holes and the insertion holes 71A of the lower mounting plate 55, and the lower mounting plate 55 and the mounting pedestals 7A, 7B are fastened, so that the lifting device 5 is moved relative to the left deck 34L. Fixed.

In this way, the lifting device 5 can be fastened to each of the left deck 34L and the upper surface portion 33T of the machine room 33. As a result, compared to the case where the lifting device 5 is attached only to the opening/closing door 331, the load applied to the opening/closing door 331 when going up and down can be reduced, and the lifting device 5 can be fixed more firmly. Become.

Note that when opening the door 331 to access the inside of the machine room 33, the fixation between the upper mounting plate 54 and the mounting brackets 334A, 334B and the fixation between the lower mounting plate 55 and the mounting pedestals 7A, 7B are removed. As a result, the elevating device 5 is attached only to the opening/closing door 331 and can rotate in the horizontal direction together with the opening/closing door 331.

When closing the opened door 331, in this embodiment, since the mounting pedestals 7A and 7B include the inclined surface 72, the lower mounting plate 55 is less likely to collide with the mounting pedestals 7A and 7B. , can be smoothly moved onto the upper surface 71 of the mounting bases 7A, 7B.

As shown in FIGS. 5, 8, and 9, the three steps of step bars 52A, 52B, and 52C are arranged at regular intervals in the vertical direction (the direction in which the pair of support columns 51A and 51B extend). Among the three steps 52A, 52B, and 52C, the middle step 52B is attached to the upper two support brackets 6 among the four support brackets 6, and the bottom step 52C is attached to the two upper support brackets 6 among the four support brackets 6. It is fastened to the two lower support brackets 6 using bolts 81 and nuts 82 as fastening members, respectively.

As shown in an enlarged view in FIG. 9, the bolt 81 is inserted into the step bars 52B, 52C and the third plate portion 63 of the support bracket 6 in a direction perpendicular to the step bars 52B, 52C side. The plate portion 63 is tightened from the back side with a nut 82. That is, the step bars 52B, 52C and the four support brackets 6 are fastened in a direction perpendicular (intersecting) to the outer surface 331A of the opening/closing door 331. Thereby, even if a downward load is applied to the elevating device 5 due to elevating and lowering, the fixation to the opening/closing door 331 is unlikely to come off.

In this embodiment, the ladder constituting the lifting device 5 has three steps 52A, 52B, and 52C, but the number of steps does not necessarily have to be three; It is possible to change it as appropriate according to the specifications of No. 33.

Next, the configuration of the hinge member 9 will be explained mainly with reference to FIGS. 11 to 13.

FIG. 11 is a diagram when FIG. 8 is viewed from the left side of the rotating structure 13. FIG. 12 is a diagram when FIG. 8 is viewed from above the rotating body 13. FIG. 13 is a diagram when FIG. 6 is viewed from above.

The hinge member 9 includes a link portion 91 provided on one support column 51A of the lifting device 5, a bracket portion 92 provided on the front side of the opening portion 33C in the left side portion 33L of the machine room 33, and the link portion 91 and the bracket portion. 92, and a shaft-shaped connecting pin 93 that connects to the connecting pin 92. The opening/closing door 331 and the lifting device 5 rotate in the horizontal direction about the connection pin 93 as a rotation center.

As shown in FIG. 11, the link portion 91 includes a pair of plates 91A and 91B extending from one support 51A toward the opposite side from the other support 51B. The pair of plates 91A and 91B are separated by a predetermined distance L1 in the axial direction (vertical direction) of the connecting pin 93, and the upper plate 91A is at the lower end position of the center step 52B, and the lower plate 91B is at the lower end position of the center step 52B. They are respectively arranged at the upper end positions of the lowermost step bars 52C. The upper plate 91A and the lower plate 91B each have an insertion hole through which the connecting pin 93 is inserted.

The bracket portion 92 includes a hollow cylindrical portion 920 through which a connecting pin 93 is inserted. As shown in an enlarged view in FIG. 11, the length L2 of the cylindrical portion 920 in the extending direction is set shorter than the distance L1 between the pair of plates 91A, 91B (L2<L2), and is placed between. A gap S is formed between the upper plate 91A and the cylindrical portion 920, and between the lower plate 91B and the cylindrical portion 920, respectively.

In this way, by forming the gap S between the link part 91 and the bracket part 92, vertical positional deviation occurs when the lifting device 5 is fixed to the upper surface part 33T of the machine room 33 or the left deck 34. In addition, since the downward load applied to the lifting device 5 during lifting and lowering is not directly transmitted to the bracket portion 92, damage to the bracket portion 92 due to repeated lifting and lowering of the lifting device 5 can be prevented. can.

The embodiments of the present invention have been described above. Note that the present invention is not limited to the embodiments described above, and includes various modifications. For example, the above-described embodiments have been described in detail to explain the present invention in an easy-to-understand manner, and the present invention is not necessarily limited to having all the configurations described. Furthermore, it is possible to replace a part of the configuration of this embodiment with the configuration of other embodiments, and it is also possible to add the configuration of other embodiments to the configuration of this embodiment. Furthermore, it is possible to add, delete, or replace some of the configurations of this embodiment with other configurations.

For example, in the above embodiment, the hinge member 9 is provided in front of the opening 33C in the left side 33L of the machine room 33, and opens the door 331 toward the front of the revolving structure 13, but the hinge member 9 is not limited to this. Depending on the specifications of the revolving structure 13, the hinge member 9 may be provided behind the opening 33C in the left side 33L of the machine room 33, and the door 331 may be opened toward the rear of the revolving structure 13.

Further, in the above embodiment, the elevating device 5 is fixed to each of the outer surface 331A of the opening/closing door 331, the upper surface 33T of the machine room 33, and the left deck 34L, but the invention is not limited to this, and at least the opening/closing door 331 It suffices if it is fixed to the outer surface portion 331A of.

Further, in the above embodiment, the elevating device 5 is attached to the four support brackets 6 provided on the outer surface 331A of the opening/closing door 331 using bolts 81 and nuts 82, but this is not limited to this. It may be directly joined to and integrally provided with the outer surface portion 331A of the door 331 by, for example, welding.

Further, in the above embodiment, the elevating device 5 is configured with a ladder, but it does not necessarily have to be a ladder, and is a mechanism that can move up and down between the upper surface portion 33T of the machine room 33 and the left deck 34L. It is sufficient as long as it has the following.

Further, in the above embodiment, the mounting pedestals 7A and 7B provided on the left deck 34L included the sloped surface 72, but it is not necessary that the mounting pedestals 7A and 7B include the sloped surface 72, and the pair of support columns 51A and 51B Any shape is acceptable as long as it can be attached.

Further, in the above embodiment, a so-called high-post type crawler type hydraulic excavator 1 has been described as one aspect of the working machine, but the invention is not limited to this, and a normal hydraulic excavator 1 without a post 12 or other working machines may be used. There may be.

1: Hydraulic excavator (work machine)
5: Lifting device 6: Support brackets 7A, 7B: Mounting pedestal 9: Hinge member 11: Traveling body 12: Post 13: Swivel body 14: Working device 31: Operator's cab 33: Machine room 33C: Opening 33L: Left side ( one side)
33T: Upper surface part 34L: Left deck 34R: Right deck 51A, 51B: Posts 52A, 52B, 52C: Step 55: Lower mounting plate (mounting plate)
71: Upper surface 72: Inclined surface 81: Bolt (fastening member)
82: Nut 91: Link part 92: Bracket part 93: Connection pin 114A: Front stairs (stairs)
114B: Back stairs (stairs)
331: Opening/closing door 331
331A: Outer surface S: Gap

Claims (6)

A self-propelled running body,
a rotating body that is rotatably provided with respect to the traveling body;
A working device attached to the revolving body,
The rotating body is
A deck extending in the front and back direction on the left and right sides;
a driver's cab provided on one side of the working device;
A working machine having a machine room provided at the rear of the operator's cab,
On one side of the machine room,
An opening for accessing the inside of the machine room is formed, and an opening/closing door is provided that rotates in a horizontal direction to open and close the opening,
On the outer surface of the opening/closing door,
A working machine characterized by being provided with an elevating device that is horizontally rotatable together with the opening/closing door and that moves up and down between the deck and the upper surface of the machine room. The working machine according to claim 1,
The lifting device is
A working machine characterized in that it can be fastened to each of the deck and the upper surface portion of the machine room. The working machine according to claim 1,
The opening/closing door and the lifting device are:
horizontally rotating with respect to the one side of the machine room via a hinge member;
The hinge member is
a link part provided in the lifting device;
a bracket part provided on one side of the front and back of the opening in the one side of the machine room;
a shaft-shaped connection pin that is a rotation center of the opening/closing door and the lifting device and connects the link part and the bracket part;
A working machine characterized in that a gap is formed between the link part and the bracket part in the axial direction of the connection pin. The working machine according to claim 1,
The lifting device is
It has a pair of pillars that extend vertically along the outer surface of the opening/closing door and are lined up at a predetermined interval in the horizontal direction, and a plurality of steps that connect the pair of pillars. Consists of a ladder
The outer surface portion of the opening/closing door includes:
A plurality of support brackets that support the ladder are joined in correspondence with positions of the plurality of rungs,
The plurality of step bars and the plurality of support brackets are:
A working machine characterized by being fastened by a fastening member. The working machine according to claim 4,
At the lower ends of the pair of pillars, respectively,
a mounting plate extending along the deck;
On the deck,
a pair of mounting pedestals to which the mounting plates are attached;
The mounting base is
an upper surface opposite to a lower surface of the mounting plate in a state where the opening/closing door closes the opening;
an inclined surface that slopes diagonally downward from the upper surface toward a side opposite to the machine room;
A working machine characterized in that a pair of the mounting plates and a pair of the mounting bases are each fastened to each other. The working machine according to claim 1,
a cylindrical post extending vertically between the traveling body and the rotating body;
Further comprising a staircase provided on at least one front and rear side of the post for ascending and descending between the ground and the revolving body,
The opening/closing door and the lifting device are
A working machine, characterized in that the machine is provided in a side portion of the machine room on the driver's cab side.

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