JP2020165126A - Hydraulic shovel - Google Patents

Abstract

To make an attaching and detaching work of a work machine to a revolving body easy and to reduce labor and man hours required for attaching and detaching a work machine.SOLUTION: A hydraulic shovel comprises: a cab positioned at a left side of a center frame at a center portion in left and right direction of a revolving frame so as to extend forward and backward; and an on-vehicle apparatus positioned at a right side of the center frame. The hydraulic shovel comprises: a first foot pin and a second foot pin mounted on the center frame; and a connection unit connecting a work machine and the center frame. The connection unit comprises: a main body frame; a third foot pin connecting a boom and the main body frame; a fourth foot pin connecting a boom cylinder and the main body frame; a U-shaped first recessed portion engaging with the first foot pin mounted on the center frame; a second recessed portion covering an outer peripheral surface of the second foot pin; a hook holding and fixing the second foot pin together with the second recessed portion; and a hook cylinder rotating the hook.SELECTED DRAWING: Figure 1

Description

The present invention relates to a hydraulic excavator configured by connecting a working machine including a boom, an arm and an attachment to a swivel body provided so as to be swivel on the upper part of the traveling body, and the working machine can be easily attached to and detached from the swivel body. Related to hydraulic excavators.

The hydraulic excavator is generally configured by connecting a working machine including a boom, an arm and an attachment to a swivel body provided so as to be swivelable on the upper part of the traveling body. The boom forming the base of the work equipment is typically via a foot pin inserted from the left-right direction with respect to a bracket-shaped center frame located at the center in the left-right direction in the base frame (swivel frame) of the swivel body. (Patent Document 1).

JP-A-2010-106522

However, the number of in-vehicle devices for hydraulic excavators has increased with the recent increase in functionality, and many in-vehicle devices are precisely laid out on the swivel frame. Tanks such as oil tanks, utility boxes, equipment and facilities such as cabs are arranged close to each other on the left and right sides of the center frame, and there is no space for inserting and removing the foot pin that supports the base of the work machine. Therefore, when attaching / detaching the work equipment to / from the rotating body, it is necessary to remove the equipment arranged next to the center frame or its cover to secure a space for inserting / removing the foot pin.

In hydraulic excavators, not only attachments such as buckets, but also work machines with a two-piece boom specification that includes a boom that connects the first boom and the second boom, for example, the work machine itself is different depending on the application. It may be exchanged for something. At present, it is necessary to remove and assemble the equipment arranged next to the center frame each time the work equipment is replaced in this way, and the work equipment replacement work requires a great deal of labor and man-hours. .. The same applies when the work equipment is attached or detached for maintenance.

An object of the present invention is to provide a hydraulic excavator capable of facilitating the work of attaching and detaching a working machine to a swivel body and reducing the labor and man-hours required for attaching and detaching the working machine.

In order to achieve the above object, the present invention provides a traveling body, a swivel frame of a swivel body provided on the upper part of the traveling body so as to be swivel, and extending back and forth at the center of the swivel frame in the left-right direction. A center frame, a working machine connected to the center frame and including a boom and a boom cylinder, a driver's cab mounted on the swivel frame so as to be located on one side of the center frame in the left-right direction, and the above. In a hydraulic excavator equipped with an in-vehicle device mounted on the swivel frame so as to be located on the other side in the left-right direction of the center frame, the excavator is mounted on the center frame and extends to the left and right between the driver's cab and the in-vehicle device. The intervening first foot pin, a second foot pin that is attached to the center frame and extends to the left and right and is located at a position higher than the first foot pin, and a connecting unit that connects the working machine and the center frame are provided. The unit includes a main body frame, a third foot pin that rotatably connects the base of the boom to the main body frame, and a fourth foot pin that rotatably connects the base of the boom cylinder to the main body frame. A U-shaped first recess that covers the first foot pin mounted on the center frame and engages with the first foot pin, and an outer circumference of the second foot pin with the first recess covered on the first foot pin. It includes a second recess that covers the surface, a hook that is rotatably connected to the main body frame and grips and fixes the second foot pin together with the second recess, and a hook cylinder that rotates the hook. It is characterized by being.

In the present invention, when the work machine is mounted on the swivel body, the work machine with the connecting unit mounted on the base is lifted by a heavy machine such as a crane, and the base of the boom is inserted between the driver's cab and the in-vehicle device. Then, the first foot pin mounted on the center frame of the swivel frame is hung so as to cover the first recess of the connecting unit. Further, the work machine is rotated around the first foot pin as a fulcrum in the boom raising direction, and the second recess of the connecting unit is hung so as to cover the second foot pin. After that, the hook is hooked on the foot pin by extending the hook cylinder, the first foot pin and the second foot pin are restrained by the first recess and the hook, and the work machine is mounted on the center frame. The work of removing the working machine from the swivel body can be completed in the reverse procedure.

As described above, in the present invention, it is not necessary to insert and remove the first foot pin and the second foot pin with respect to the center frame when attaching and detaching the working machine. Therefore, it is not necessary to remove or assemble the in-vehicle device arranged next to the center frame to the swivel frame in order to attach / detach the working machine. In addition, when mounting the working machine on the swivel body, it is not necessary to align the boom and the pin holes of the boom cylinder and the center frame when inserting the first foot pin and the second foot pin. Further, conventionally, the boom and the boom cylinder had to be individually connected to the center frame, but in the present invention, the boom and the boom cylinder are connected by the connecting unit, and the connecting unit is mounted on the center frame. Just do it. As described above, according to the present invention, it is possible to facilitate the work of attaching and detaching the working machine to the rotating body, and to significantly reduce the labor and man-hours required for attaching and detaching the working machine.

Side view of the hydraulic excavator according to the embodiment of the present invention Side view of the work machine provided in the hydraulic excavator of FIG. Side view of the connecting unit provided in the hydraulic excavator of FIG. Bottom view of the connecting unit provided in the hydraulic excavator of FIG.

Embodiments of the present invention will be described below with reference to the drawings.

-Excavator-
FIG. 1 is a side view of a hydraulic excavator according to an embodiment of the present invention. Hereinafter, the front of the driver's seat (right side in FIG. 1) is referred to as the front of the swivel body 12. In the figure, the base of the working machine 20 is shown by partially seeing through the tank cover 18a. FIG. 1 illustrates a hydraulic excavator equipped with a so-called short reach type working machine. The illustrated hydraulic excavator includes a vehicle body 10 and a working machine 20. The vehicle body 10 includes a traveling body 11 and a turning body 12.

The traveling body 11 forms the base structure of the hydraulic excavator, and may be a wheel type traveling body, but in the present embodiment, a crawler type traveling body provided with left and right crawler belts 13 is used. The left and right tracks 13 are driven by the left and right traveling drive devices 14, respectively. The traveling drive device 14 includes a hydraulic motor and a speed reducer. The swivel body 12 is provided on the traveling body 11 via a swivel wheel 15, and by driving the swivel wheel 15 with a swivel motor (not shown), the swivel body 12 is provided with respect to the traveling body 11 about a vertically extending shaft. And turn. The swivel motor is a hydraulic motor, but in addition to the case where an electric motor is used, a hydraulic motor and an electric motor may be used together.

The swivel body 12 includes a swivel frame 16, a driver's cab 17, a machine room 18, a counterweight 19, and the like. The swivel frame 16 is a base frame of the swivel body 12, and is provided on the upper portion of the traveling body 11 so as to be swivelable via the swivel wheel 15, and supports each device mounted on the swivel body 12. A bracket-shaped center frame 16a for connecting the work equipment 20 is provided at the center of the swivel frame 16 in the left-right direction. The center frame 16a is configured to include left and right vertical plates and the like, and extends back and forth on the swivel frame 16. A foot pin (first foot pin) 16p and a foot pin (second foot pin) 16q are mounted on the center frame 16a. Both the foot pins 16p and 16q extend horizontally to the left and right, and are interposed between the driver's cab 17 and an in-vehicle device (for example, a tank cover 18a described later). The foot pin 16q is located higher and rearward than the foot pin 16p.

The driver's cab 17 is mounted on the swivel frame 16 so as to be located on one side (left side in the present embodiment) of the center frame 16a in the left-right direction at the front portion of the swivel frame 16. In the present embodiment, the driver's cab 17 is arranged on the left side of the center frame 16a, but the driver's cab 17 may be arranged on the right side of the center frame 16a. Inside the driver's cab 17, operating devices such as a driver's seat (not shown) on which the operator sits and an operating lever operated by the operator are arranged.

Further, on the side opposite to the cab 17 (the other side in the left-right direction of the center frame 16a) with the working machine 20 in the front part of the swivel frame 16 sandwiched, tanks such as a fuel tank and a hydraulic oil tank, a utility box, etc. In-vehicle equipment is installed. These tanks and utility boxes are covered by the tank cover 18a. The tank cover 18a is also one of the in-vehicle devices. Various tools are stored in the utility box, but in recent years, for example, a urea water tank of a urea SCR system may be stored.

The counter weight 19 is a weight that balances the weight with the working machine 20, and is mounted on the rear end of the swivel frame 16. In the present embodiment, the counterweight 19 is located in front of the rear end of the traveling body 11 in a state where the front-rear direction of the rotating body 12 and the traveling direction of the traveling body 11 coincide with each other (the state shown in FIG. 1). There is. As a result, the maximum turning radius of the turning body 12 is suppressed to the same extent as, for example, the vehicle width of the traveling body 11 or slightly larger (for example, 20%). Therefore, even in a narrow work space, the rear end of the swivel body 12 swivels without greatly protruding from the vehicle width, and contact with surrounding obstacles is suppressed. Such a hydraulic excavator is called a rear small swivel machine. As described above, the layout of the equipment mounted on the swivel body 12 becomes denser due to the size limitation of the rear part of the swivel body 12, and the prime mover E is arranged so as to partially overlap the swivel wheel 15 when viewed from above, for example.

The machine room 18 is arranged on the rear side of the driver's cab 17 (position between the driver's cab 17 and the counterweight 19) in the swivel frame 16. The machine room 18 houses a prime mover E, a hydraulic pump P, a control valve (not shown), heat exchangers, and the like. An engine (internal combustion engine) is used as the prime mover E, but an electric motor may also be used. The hydraulic pump P is driven by the prime mover E, sucks hydraulic oil from the hydraulic oil tank, and discharges it as pressure oil. The control valve controls the direction and flow rate of the pressure oil discharged from the hydraulic pump P and supplies the pressure oil to the corresponding hydraulic actuator. The heat exchangers include a radiator for cooling the engine cooling water, an oil cooler for cooling the hydraulic oil (not shown), and the like.

-Working machine-
FIG. 2 is a side view of the working machine. The working machine 20 is an articulated front working device including a boom 21, an arm 22, an attachment 23, a boom cylinder 24, an arm cylinder 25, and an attachment cylinder 26. Although the details will be described later, a connecting unit 1 (described later) is attached to the base of the working machine 20, and the working machine 20 is attached to the vehicle body 10 via the connecting unit 1.

The boom 21 is the basic structure of the working machine 20, and is bent so that the front portion 21c (the portion on the tip end side) tilts forward with respect to the rear portion 21a (the portion on the proximal end side) via the bent portion 21b. It is configured as a boomerang type that is convex upward when viewed from the side. The boom 21 is rotatably connected to the connecting unit 1 (described later) via a foot pin 21p extending to the left and right. The base of the boom 21 is interposed between the driver's cab 17 and the tank cover 18a. Unlike the boom 21, the arm 22 has a linear shape as a whole, and is rotatably connected to the tip of the boom 21 via a pin 22p extending to the left and right. The attachment 23 is rotatably connected to the tip of the arm 22 via a pin 23p extending to the left and right. The attachment 23 is an actuated work tool (hydraulic attachment) equipped with a hydraulic actuator 27. 1 and 2 exemplify a case where a crusher that sandwiches and crushes a dismantling object is attached to an arm 22 as an attachment 23. The attachment 23 can be replaced with another work tool such as a bucket.

In the following description, of the outer wall surface of the boom 21, the surface facing upward (the surface facing the boom raising direction) with the work machine 20 extended forward is the back side surface of the boom 21, and the surface facing downward (boom). The surface facing the lowering direction) is appropriately described as the ventral side surface of the boom 21. Similarly, of the outer wall surface of the arm 22, the surface facing upward (the surface facing the arm dump direction) with the work machine 20 extended forward is the back side surface of the arm 22, and the surface facing downward (facing the arm cloud direction). The surface) is appropriately described as the ventral side surface of the arm 22.

The boom cylinder 24 is a hydraulic cylinder that drives the boom 21 and rotates it up and down, and is provided one on each side of the boom 21. The base end portions (bottom side end portions in this example) of the left and right boom cylinders 24 are rotatably connected to the connecting unit 1 via foot pins 24p extending to the left and right. The tip end portion of the boom cylinder 24 (the end portion on the rod side in this example) is rotatably connected to the front portion 21c of the boom 21 via a pin 24q extending to the left and right.

The arm cylinder 25 is a hydraulic cylinder that drives the arm 22 and rotates it back and forth, and is arranged on the ventral side (lower side) of the boom 21 and the arm 22. The base end portion (bottom side end portion in this example) of the arm cylinder 25 is rotatably connected to a bracket 21x provided on the ventral side surface of the rear portion 21a of the boom 21 via a pin 25p extending to the left and right. .. The tip end portion (end portion on the rod side in this example) of the arm cylinder 25 is rotatably connected to a bracket 22x provided on the ventral side surface of the arm 22 via a pin 25q extending to the left and right. The arm cylinder is generally placed on the ventral side of the work machine 20 so that the arm cloud operation, which has a large load, is performed during the extension operation, which is advantageous in terms of output in comparison with the pressure receiving area. It is configured so that arm cloud operation is performed. This is to improve the suitability for work in a narrow work space. Another advantage is that the arm cylinder 25 does not interfere with obstacles above the tunnel ceiling or the like, and the arm cylinder 25 does not get in the way when excavating the vicinity of the tunnel ceiling. Further, by arranging the arm cylinder 25 on the ventral side of the boom 21 and the arm 22, the arm cylinder 25 is protected from falling objects during work by the boom 21 and the arm 22.

The attachment cylinder 26 is a hydraulic cylinder that rotates the attachment 23 in the dump direction and the cloud direction, and is arranged on the back side of the arm 22 in this embodiment. The base end portion (bottom side end portion in this example) of the attachment cylinder 26 is rotatably connected to the back side surface of the base portion side of the arm 22 via a pin 26p extending to the left and right. The tip of the attachment cylinder 26 (the end on the rod side in this example) is connected to the tip of the arm 22 and the attachment 23 via a link 29. The tip of the attachment cylinder 26 and the link 29 are connected by a pin 26q extending to the left and right.

The work machine 20 in the present embodiment has a short reach specification, and the reach is shortened by making the boom 21 and the arm 22 shorter than the work machine of a general hydraulic excavator of the same vehicle class. For example, the total length of the boom 21 (distance between the foot pins 21p and the pins 22p) is shorter than the total length of the vehicle body 10 (front-rear length of the traveling body 11). Similarly, the total length of the arm 22 (distance between pins 22p and 23p) is shorter than the total length of the vehicle body 10. Further, the operating range of the boom 21 may be limited so that the rear portion 21a of the boom 21 does not tilt backward beyond the vertical even in the fully extended state of the boom cylinder 24. Further, the boom 21 and the cab 17 on the swivel body 12 are arranged so that the back side surface of the front portion 21c of the boom 21 is horizontal and the back side surface of the front portion 21c is at the same height as the upper surface of the cab 17. The positional relationship with is set. This is to make it difficult for the boom 21 and the arm 22 to interfere with obstacles above.

-Connecting unit-
FIG. 3 is a side view of the connecting unit provided in the hydraulic excavator according to the present embodiment, and FIG. 4 is a bottom view thereof, which is viewed from the direction of arrow IV in FIG. The connecting unit 1 is a hydraulically driven joint device that connects the center frame 16a of the swivel frame 16 and the working machine 20, and is a kind of so-called quick hitch. As shown in FIGS. 3 and 4, the connecting unit 1 includes a main body frame 2, a foot pin (third foot pin) 21p, a foot pin (fourth foot pin) 24p, a recess (first recess) 3, and a recess (second recess). ) 4, Hook 5, and hook cylinder 6 are included.

The main body frame 2 includes a left and right vertical plate 2a and a horizontal plate 2b that connects the left and right vertical plates 2a. The foot pins 21p and 24p are shafts that support the base of the working machine 20 as mentioned above. In the present embodiment, the foot pin 21p rotatably connects the base of the boom 21 to the main body frame 2, and the foot pin 24p rotatably connects the base of the boom cylinder 24 to the main body frame 2. The left and right vertical plates 2a of the main body frame 2 are provided with bosses 2c and 2d on the side closer to the working machine 20 (on the right side in FIG. 3). The foot pin 21p is passed through the boom 21 via the boss 2c, and the foot pin 24p is passed through the boom cylinder 24 via the boss 2d. In this way, the connecting unit 1 is mounted on the base of the working machine 20, and at the same time, the boom 21 and the boom cylinder 24 of the working machine 20 are connected via the connecting unit 1.

The positional relationship between the foot pins 21p and 24p generally corresponds to the foot pins 16q and 16p mounted on the center frame 16a of the swivel frame 16. In the present embodiment, the diameters of the foot pins 21p and 24p are configured to be equal to the diameters of the foot pins 16q and 16p.

The recess 3 is a U-shaped groove provided in the lower part of the left and right vertical plates 2a of the main body frame 2. The recess 3 is open downward and covers the foot pin 16p mounted on the center frame 16a of the swivel frame 16 and engages with the foot pin 16p. The inner portion of the recess 3 is formed in an arc shape corresponding to the outer peripheral surface of the foot pin 16p, and when the arc-shaped portion is in contact with the outer peripheral surface of the foot pin 16p as shown in FIG. 3, the recess 3 and the foot pin are formed. It is configured so that there is no rattling between it and 16p.

The recess 4 is provided in the upper part of the main body frame 2 and opens toward the foot pin 16q mounted on the center frame 16a. The recess 4 is a long groove extending in the radial direction of the virtual circle (diagonally upward to the left in FIG. 3) centered on the foot pin 16p (recess 3), and the frontage thereof is set longer than the diameter of the foot pin 16q. When the main body frame 2 is rotated toward the center frame 16a with the foot pin 16p as a fulcrum with the recess 3 covered with the foot pin 16p, the recess 4 covers the foot pin 16q (the foot pin 16q surely enters the recess 4). Is.

The hook 5 is a metal fitting that grips and fixes the foot pin 16q together with the recess 4, and in the present embodiment, a pair (two) of hooks 5 are provided between the left and right vertical plates 2a along the left and right vertical plates 2a (FIG. 5). 4). The left and right hooks 5 are rotatably connected to the left and right vertical plates 2a of the main body frame 2 via pins 5a. The hook cylinder 6 is a hydraulic actuator that rotates the hook 5, and is provided in pairs (two) along the left and right vertical plates 2a between the left and right vertical plates 2a like the hook 5 (FIG. 4). .. The bottom-side ends of the left and right hook cylinders 6 are rotatably connected to the left and right vertical plates 2a of the main body frame 2 via pins 6a, and the rod-side ends are connected to the left and right hooks 5. On the other hand, they are rotatably connected via a pin 6b.

The hook cylinder 6 is driven by, for example, the pressure oil discharged from the hydraulic pump P (FIG. 1). When the hook cylinder 6 is extended, the hook 5 is closed, and when the hook cylinder 6 is contracted, the hook 5 is opened. The hook 5 is attached to the main body frame 2 with the claws facing the opposite side of the recess 3, and when the hook cylinder 6 extends, it rotates in a direction away from the recess 3 and hangs on the foot pin 16q, and the recess 4 Restrain the foot pin 16q inside. As described above, the hook 5 and the hook cylinder 6 are provided in two sets, and the hook 5 is locked at two locations in the longitudinal direction of the foot pin 16q (FIG. 4). On the contrary, when the hook cylinder 6 contracts, the hook 5 rotates in the direction of approaching the recess 3, and the restraint of the foot pin 16q is released.

By closing the hook 5 with the recesses 3 and 4 covering the foot pins 16p and 16q mounted on the center frame 16a of the swivel frame 16 as described above, the foot pins 16p and 16q are firmly restrained by the recesses 3 and the hook 5. Will be done. In this way, the boom 21 of the working machine 20 is connected to the center frame 16a of the turning frame 16 via the connecting unit 1, and the working machine 20 is mounted on the vehicle body 10.

-Effect-
(1) When the working machine 20 is mounted on the swivel body 12, the working machine 20 having the connecting unit 1 mounted on the base is lifted by a heavy machine such as a crane, and the base of the boom 21 is placed between the cab 17 and the tank cover 18a. Insert it. Then, the foot pin 16p mounted on the center frame 16a of the swivel frame 16 is hung so as to cover the recess 3 of the connecting unit 1. Further, the work machine 20 is rotated in the backward tilting direction (boom raising direction) with the foot pin 16p as a fulcrum, and the recess 4 of the connecting unit 1 is hung so as to cover the foot pin 16q. Around this time, the hook cylinder 6 is connected to the hydraulic circuit of the hydraulic excavator. After that, the hook 5 is hung on the foot pin 16q by extending the hook cylinder 6, the foot pins 16p and 16q are restrained by the recess 3 and the hook 5, and the working machine 20 is mounted on the center frame 16a. Finally, by connecting the hydraulic piping of the hydraulic actuator such as the boom cylinder 24, the mounting of the working machine 20 on the swivel body 12 is completed. The work of removing the work machine 20 from the swivel body 12 can be completed in the reverse procedure.

As described above, in the present embodiment, it is not necessary to insert and remove the foot pins 16p and 16q with respect to the center frame 16a when the working machine 20 is attached and detached. Therefore, it is not necessary to remove or assemble the in-vehicle device such as the tank cover 18a arranged next to the center frame 16a with respect to the swivel frame 16 for attaching / detaching the working machine 20. In addition, when mounting the working machine 20 on the swivel body 12, it is not necessary to align the pin holes of the boom 21 and the boom cylinder 24 and the center frame 16a when inserting the foot pins 16p and 16q. Further, conventionally, the boom and the boom cylinder had to be individually connected to the center frame, but in the present embodiment, the boom 21 and the boom cylinder 24 are connected by the connecting unit 1, and the connecting unit 1 May be mounted on the center frame 16a. As described above, according to the present embodiment, the work of attaching / detaching the working machine 20 to / from the rotating body 12 can be facilitated, and the labor and man-hours required for attaching / detaching the working machine 20 can be significantly reduced.

(2) A moment load in the twisting direction also acts on the base of the working machine 20 of the hydraulic excavator during the work. On the other hand, in the present embodiment, two sets of hooks 5 and hook cylinders 6 are provided, hooks 5 are locked at two locations in the longitudinal direction of the foot pin 16q, and the left and right hooks 5 are respectively strengthened by the hook cylinders 6. Is supported by. By providing such two sets of hooks 5 and hook cylinders 6, it is possible to reliably support the moment load acting on the working machine 20 in the twisting direction.

-Modification example-
In the above embodiment, the case where the present invention is applied to a hydraulic excavator provided with a work machine 20 having a short reach specification has been described as an example, but the present invention can be applied to various work machines. Of course, it can be applied to a hydraulic excavator equipped with a general working machine, and for example, it can be applied to a hydraulic excavator equipped with a so-called two-piece boom specification working machine (for example, Japanese Patent Application Laid-Open No. 2011-74745). By mounting the connecting unit 1 on the base regardless of the type of the working machine, the working machine can be easily attached to and detached from the swivel body by the same procedure as described above.

Further, although the lock mechanism of the hook 5 is not particularly described, the lock mechanism can be provided so that the hook 5 does not loosen while the working machine 20 is attached to the swivel body 12. As a locking mechanism, for example, in addition to a hard one that pins the hook 5 to the main body frame 2, a circuit-like one that suppresses the outflow of pressure oil from the oil chamber on the bottom side of the hook cylinder 6 with a holding valve is also considered. Be done.

1 ... Connecting unit, 2 ... Main body frame, 3 ... Recess (first recess), 4 ... Recess (second recess), 5 ... Hook, 6 ... Cylinder for hook, 11 ... Traveling body, 16 ... Swivel frame, 16a ... Center frame, 16p ... foot pin (1st foot pin), 16q ... foot pin (2nd foot pin), 17 ... cab, 18a ... tank cover (vehicle-mounted device), 20 ... work machine, 21 ... boom, 21p ... foot pin (3rd) Foot pin), 24 ... Boom cylinder, 24p ... Foot pin (4th foot pin)

Claims (2)

A traveling body, a swivel frame of a swivel body provided so as to be swivel on the upper part of the traveling body, a center frame extending in the front-rear direction at the center of the swivel frame in the left-right direction, and a boom connected to the center frame A work machine including a boom cylinder, a driver's cab mounted on the swivel frame so as to be located on one side of the center frame in the left-right direction, and a work machine mounted on the other side of the center frame in the left-right direction. In a hydraulic excavator equipped with an in-vehicle device mounted on the swivel frame
A first foot pin that is mounted on the center frame and extends to the left and right and is interposed between the driver's cab and the in-vehicle device.
A second foot pin that is mounted on the center frame and extends to the left and right and is located higher than the first foot pin.
A connecting unit for connecting the working machine and the center frame is provided.
The connecting unit is
Body frame and
A third foot pin that rotatably connects the base of the boom to the main body frame,
A fourth foot pin that rotatably connects the base of the boom cylinder to the main body frame,
A U-shaped first recess that covers the first foot pin mounted on the center frame and engages with the first foot pin.
A second recess that covers the outer peripheral surface of the second foot pin with the first recess covering the first foot pin.
A hook that is rotatably connected to the main body frame and grips and fixes the second foot pin together with the second recess.
A hydraulic excavator including a hook cylinder for rotating the hook. The hydraulic excavator according to claim 1, further comprising two sets of the hook and the hook cylinder, and the hook is locked at two positions in the longitudinal direction of the second foot pin. ..

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