JP5164177B2 - Construction machine with cab - Google Patents

Description

  The present invention relates to a technical field of a construction machine having a cab such as a hydraulic excavator.

  Among construction machines, for example, an excavator, such as a hydraulic excavator, is provided with an upper swing body that is pivotably supported by a lower traveling body, and a cab that serves as an operator's cab is provided on a swing frame that is a base of the upper swing body. There is a thing equipped with. In such a construction machine, the cab is generally supported by a swivel frame via an anti-vibration mount in order to reduce vibration and noise transmitted from the fuselage to the cab. In order to prevent the anti-vibration mount from being damaged and the cab from being removed from the revolving frame in such a case, a predetermined displacement is applied to the cab in the vicinity of the anti-vibration mount with respect to the extending direction of the anti-vibration mount. A technique is known in which a restricting member is provided that restricts the displacement when it occurs (see, for example, Patent Document 1). In this structure, the restricting member is configured using a stopper member fixed to the bottom of the cab and a stopper receiving portion (receiving plate) provided on a support frame (rear support frame) to which a vibration isolation mount is attached. The stopper member has a diameter larger than the through hole formed in the stopper receiving portion and is positioned below the stopper receiving portion, and is inserted from below the stopper to fix the stopper to the cab. And a bolt that passes through the through hole and is fastened to the bottom of the cab.

JP 2004-189089 A

By the way, when providing the regulating member as in Patent Document 1, as described above, the stopper is fixed to the cab bottom by a bolt inserted from the lower side of the stopper and fastened to the cab bottom. In this case, the bolt is fastened using a bolt fastener such as a socket wrench. For this reason, a space for engaging a bolt fastener with the bolt and performing a bolt fastening operation is required below the bolt.
On the other hand, among the swivel frames of construction machines such as hydraulic excavators, there is a flat plate structure in which substantially the entire swivel frame is formed by a single flat plate. Such a flat slewing frame is mainly used in a small model such as a small slewing hydraulic excavator. However, the construction machine using the flat slewing frame is disclosed in Patent Document 1 described above. When the restriction member is to be provided, the stopper is positioned at an intermediate portion between the upper surface portion of the swing frame and the stopper receiving portion. For this reason, the bolt for fixing the stopper and the upper surface portion of the swing frame A space for inserting a bolt fastener and performing a bolt fastening operation is required. However, in the case of a particularly small model, it is difficult to ensure the space, and as in Patent Document 1, in which a stopper frame is provided on a support frame to which an anti-vibration mount is attached, There is a problem that it is difficult to secure a space for performing the bolt fastening operation because there is no room in the periphery of the regulating member, and there is a problem to be solved by the present invention.

The present invention was created in order to solve these problems in view of the above situation, and the invention of claim 1 is a flat revolving frame serving as a base for the upper revolving structure. In a construction machine that supports a cab via an anti-vibration mount, a restricting member for restricting displacement of the cab beyond a preset allowable range in a direction away from the revolving frame is provided on the cab. In configuring using the stopper member fixed to the left side of the bottom part and the stopper receiving part fixed to the left side of the upper surface of the swivel frame, the stopper receiving part should be mounted and supported by a vibration-proof mount that supports the left side of the cab. The stopper member is provided on the mount support frame fixed to the upper surface portion of the swivel frame, and the stopper member has a diameter larger than that of the through hole formed in the stopper receiving portion, and the swivel frame. A stopper positioned in the middle between the upper surface portion of the stopper and the stopper receiving portion, and is inserted from below the stopper to fix the stopper to the cab, passes through the through hole of the stopper receiving portion, and is fastened to the bottom portion of the cab. A notch for fastening the bolt by inserting a bolt fastener from the lower side of the swivel frame to the left edge of the swivel frame, which is formed using a bolt. A construction machine having a cab characterized by forming
According to a second aspect of the present invention, in the first aspect, the bolt fastener is a socket wrench including a socket that engages with a head portion of the bolt and a wrench that rotates the socket, and the left edge of the swivel frame. The cutout portion formed in the fan has a cab that is formed in a fan shape that expands toward the left end of the swivel frame so as to allow swinging of the wrench that rotates the socket at least 90 degrees. Construction machine.
According to a third aspect of the present invention, in the first or second aspect, the mount support frame provided with the stopper receiving portion is fixed to the revolving frame via a reinforcing plate fixed to the upper surface portion of the revolving frame, and the reinforcing plate In addition, the construction machine includes a cab characterized in that a cutout portion having the same shape is formed at the same portion as the cutout portion of the turning frame in plan view.

According to the first aspect of the present invention, when the bolt is fastened to fix the stopper constituting the restricting member to the cab, the bolt fastening work can be performed by inserting the bolt fastener from the lower side of the turning frame. Thus, there are cases where the stopper receiving portion is provided on the mount support frame and there is no space in the periphery of the restricting member, or when the space between the bolt and the upper surface of the swivel frame is narrow. However, the bolt fastening operation can be easily performed. Furthermore, since the notch is formed at the edge of the revolving frame, it can be applied to the existing revolving frame with almost no influence on the structure, strength, and cost, and is excellent in versatility.
According to the invention of claim 2, even if the wrench overlaps the swivel frame in a side view during the bolt fastening operation, the socket can be rotated at least 90 degrees to perform the bolt fastening operation. Workability of fastening work is improved.
According to the invention of claim 3, even if a reinforcing plate is interposed between the upper surface portion of the swivel frame and the mount support frame for reinforcement, the bolt fastener is inserted from the lower side of the swivel frame. The bolt fastening operation can be easily performed.

It is a side view of a hydraulic excavator. It is a top view of a turning frame. FIG. 3A is a plan view of the first mount support frame portion to which the anti-vibration mount and the restricting member are attached, and FIG. 3B is a view taken along the arrow X in FIG. 4A is a sectional view taken along line XX in FIG. 3B, and FIG. 4B is a sectional view taken along line YY in FIG. FIG. 5A is a Z arrow view of FIG. 3B, and FIG. 5B is a perspective view of FIG. It is a figure which shows the position of the socket wrench in bolt fastening operation | work.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the figure, reference numeral 1 denotes a small swing type hydraulic excavator as an example of a construction machine. The hydraulic excavator 1 is a crawler type lower traveling body 2 and an upper rotating body that is rotatably supported by the lower traveling body 2. 3. The revolving unit 3 includes a front work machine 4 and the like mounted on the upper revolving unit 3. The upper revolving unit 3 further includes a cab 5 serving as an operator's cab.

  Reference numeral 6 denotes a flat turning frame serving as a base for the upper turning body 3, and a cab arrangement portion 6 </ b> A in which the cab 5 is arranged is provided at the front left side of the turning frame 6. . Further, on the right side of the cab disposing portion 6A, a working portion attaching portion 6B to which the base end portion of the front working machine 4 is attached is provided, while the right and rear sides of the working implement attaching portion 6B, the cab arrangement. Various equipment devices such as a fuel tank, a hydraulic oil tank, an engine, a hydraulic pump, and a radiator (not shown) are arranged behind the installation portion 6A.

  The first to fourth mount support frames 9A to 9D for mounting and supporting four anti-vibration mounts 8 for supporting the four corners of the cab 5 in a state of being anti-vibrated are arranged in the cab disposing portion 6A. Has been. Of these first to fourth mount support frames 9A to 9D, a first mount support frame 9A for mounting and supporting the vibration isolating mount 8 that supports the left rear portion of the cab 5 (corresponding to the mount support frame of the present invention). Is fixed to the left side of the upper surface of the revolving frame 6 via a reinforcing plate 10 fixed to the upper surface of the revolving frame 6 by welding or the like. In the present embodiment, the left edge of the first mount support frame 9A and the reinforcing plate 10 protrude slightly outward from the left edge of the revolving frame 6. In the present embodiment, a liquid-filled viscous mount is used as the vibration-proof mount 8. However, since the structure of the liquid-filled viscous mount is well known, its description is omitted.

  The first mount support frame 9A includes a horizontal plane portion 9a parallel to the upper surface of the revolving frame 6 and the reinforcing plate 10, and a lower end portion of the horizontal mount portion 9a hanging from the outer peripheral portion of the horizontal plane portion 9a by welding or the like. The leg side portion 9b is formed in a substantially U shape with the left side opened in plan view, and the upper surface portion of the reinforcing plate 10 from the left side of the swivel frame 6 is formed. And the horizontal surface portion 9a. On the other hand, the horizontal surface portion 9a is provided with a mount attachment portion 11 to which the anti-vibration mount 8 is attached and a stopper receiving portion 13 that constitutes a regulating member 12 to be described later. It is provided at the left end of the horizontal plane portion 9a.

  The restricting member 12 is for restricting displacement of the cab 5 beyond a preset allowable range in a direction away from the revolving frame 6, and the restricting member 12 is a stopper described later. It is configured using the member 14 and a stopper receiving portion 13 provided on the horizontal surface portion 9a of the first mount support frame 9A. A through-hole 13a is formed in the central portion of the stopper receiving portion 13. Yes.

  On the other hand, the stopper member 14 is fixed to the left side of the bottom of the cab 5 via a cab-side support member 15 (such as a lower frame member of the cab 5 or a cab floor). , Sleeve 17, bolt 18 and the like. The stopper 16 has a disk shape larger in diameter than the through hole 13a of the stopper receiving portion 13, and a bolt insertion hole 16a into which a bolt 18 is inserted is formed at the center thereof. The sleeve 17 passes through the through hole 13 a of the stopper receiving portion 13 in a loosely fitting manner and is interposed between the cab-side support member 15 and the stopper 16. Further, the bolt 18 is inserted into the insertion hole 16 a from the lower side of the stopper 16, passes through the cylinder interior 17 a of the sleeve 17, and is screwed and fastened to the cab side support member 15. When the stopper member 14 is fixed to the cab 5, the sleeve 17 is passed through the through hole 13 a of the stopper receiving portion 13 and the stopper 16 is applied to the lower end portion of the sleeve 17. The bolt 18 inserted into the insertion hole 16a from below is threaded into the cab-side support member 15 through the cylinder interior 17a of the sleeve 17, and the bolt 18 until the upper end of the sleeve 17 abuts against the cab-side support member 15. Conclude. As a result, the stopper 16 is fixed to the cab 5 in a state of being positioned at an intermediate portion between the upper surface portion of the revolving frame 6 and the stopper receiving portion 13. In this state, the stopper receiving portion 13 and the stopper 16 are fixed. Is set so that a gap S corresponding to the allowable range is formed (see FIGS. 3B and 4A). The permissible range is when the cab 5 is displaced in a direction away from the revolving frame 6 in an emergency such as when the airframe falls without impairing the anti-vibration function of the anti-vibration mount 8 in a normal vibration state. Further, a displacement range of the cab 5 that does not exceed the elastic limit of the vibration isolating mount 8 is set in advance. Thus, when the cab 5 is displaced in a direction away from the revolving frame 6 when the airframe falls or the like, if the displacement exceeds the allowable range, the stopper 16 is moved to the first position along with the displacement of the cab 5. The displacement of the cab 5 is restricted by the contact with the stopper receiving portion 13 provided on the horizontal surface portion 9a of the mount support frame 9A. The anti-vibration mount 8 is constructed in a stage before exceeding the elastic limit. In this case, the load on which the cab 5 is to be displaced beyond the allowable range is received by the reinforcing plate 10 together with the first mount support frame 9A, and thereby a robust reinforcing structure that can withstand the load when the aircraft falls or the like. It has become.

  Here, as described above, the stopper 16 is fixed to the cab 5 by the bolt 18 inserted from the lower side of the stopper 16, and the fastening of the bolt 18 is a socket that engages the head 18 a of the bolt 18. This is performed using a socket wrench 19 provided with 19a and a torque wrench 19b for rotating the socket 19a. The socket wrench 19 corresponds to the bolt fastener of the present invention, and the torque wrench 19b corresponds to the wrench of the present invention.

  On the other hand, the socket wrench 19 is inserted into the left edge of the revolving frame 6 located below the bolt 18 so that the socket wrench 19 can be inserted from below the revolving frame 6 to perform the bolt fastening operation. A notch 6a is formed. Further, the reinforcing plate 10 fixed to the upper surface portion of the revolving frame 6 is also formed with a notch 10 a having the same shape at the same position as the notch 6 a of the revolving frame 6.

  The notches 6a and 10a formed on the left edge of the revolving frame 6 and the reinforcing plate 10 are formed by inserting the socket wrench 19 from below the revolving frame 6 with the socket 19a attached to the torque wrench 19b. The torque wrench 19b is formed to a size that can be engaged with the head 18a of the bolt 18 and rotates the socket 19a at least 90 degrees with the socket 19a engaged with the head 18a of the bolt 18. In order to allow rocking, the fan frame is formed in a fan shape that expands toward the left end of the revolving frame 6 (see FIG. 5A). Thus, even when the torque wrench 19b overlaps the revolving frame 6 or the reinforcing plate 10 in a side view during the fastening operation of the bolt 18, the socket 19a can be rotated at least 90 degrees so that the bolt fastening operation can be performed. It has become.

  In the present embodiment configured as described above, the excavator 1 has a regulating member 12 for regulating displacement of the cab 5 beyond a preset allowable range in a direction away from the revolving frame 6. Although provided, the regulating member 12 is configured using a stopper member 14 fixed to the left side of the bottom of the cab 5 and a stopper receiving part 13 fixed to the left side of the upper surface of the swivel frame 6. The stopper receiving portion 13 is provided on a first mount support frame 9 </ b> A that is fixed to the upper surface portion of the revolving frame 6 so as to attach and support the anti-vibration mount 8 that supports the left rear portion of the cab 5. On the other hand, the stopper member 14 has a larger diameter than the through hole 13 a formed in the central portion of the stopper receiving portion 13 and is positioned at the intermediate portion between the upper surface portion of the turning frame 6 and the stopper receiving portion 13. And a bolt 18 that is inserted from the lower side of the stopper 16 to pass through the through hole 13a of the stopper receiving portion 13 and fastened to the bottom portion of the cab 5 in order to fix the stopper 16 to the cab 5. However, a notch 6 a for fastening the bolt 18 by inserting the socket wrench 19 from the lower side of the swivel frame 6 is formed at the left side edge of the swivel frame 6 positioned below the bolt 18. ing.

  As a result, when the bolt 18 is fastened to fix the stopper 16 to the cab 5, the socket wrench 19 can be inserted from the lower side of the swivel frame 6 to perform the bolt fastening operation. In the case where the receiving portion 13 is provided on the first mount support frame 9A and there is no space in the peripheral portion of the restricting member 12, or the space between the bolt 18 and the upper surface portion of the turning frame 6 is narrow. However, the fastening operation of the bolt 18 can be easily performed.

  In addition, the notch 6a formed on the left edge of the revolving frame 6 has a fan shape that expands toward the left end of the revolving frame 6 so as to allow the wrench 19b to rotate the socket 19a at least 90 degrees. Is formed. Thus, even when the torque wrench 19b overlaps the revolving frame 6 in the side view during the fastening operation of the bolt 18, the socket 19a can be rotated at least 90 degrees to perform the bolt fastening operation. The workability of the work can be improved.

  Furthermore, since the notch 6a is formed at the edge of the revolving frame 6, it can be applied to an existing revolving frame with almost no influence on the structure, strength, and cost, and is excellent in versatility. .

  In addition, even when the tightening torque of the bolt 18 is confirmed during periodic inspection after completion of the machine body, the torque measuring instrument can be easily accessed from the lower side of the swivel frame 6 to the bolt 18 by the notch 6a. Can be made. Further, when it becomes necessary to remove the cab 5, the stopper 16 must be removed from the cab 5. In such a case as well, the socket wrench 19 is moved by the cutout portion 6a. The bolts 18 can be easily accessed from the lower side of the shaft, which can contribute to improvement of maintenance work.

  Further, in this structure, the stopper receiving portion 13 is provided on the first mount support frame 9A for mounting and supporting the vibration-proof mount 8 that supports the left rear portion of the cab 5, and the first mount support frame 9A is The revolving plate 6 is fixed to the revolving frame 6 via a reinforcing plate 10 fixed to the upper surface of the revolving frame 6, and the reinforcing plate 10 has the same shape as the notch 6 a of the revolving frame 6 in plan view. The notch 10a is formed. Thus, even if the reinforcing plate 10 is interposed between the upper surface portion of the revolving frame 6 and the first mount support frame 9A for reinforcement, the socket wrench 19 is inserted from the lower side of the revolving frame 6. The bolt fastening operation can be easily performed.

  Needless to say, the present invention is not limited to the above-described embodiment. For example, in the above-described embodiment, the stopper receiving portion is provided on a mount support frame that supports the left rear portion of the cab. The present invention can be implemented even if the portion is provided on the mount support frame that supports the left front portion of the cab. Further, in the above embodiment, the mount support frame provided with the stopper receiving portion is fixed to the swivel frame via the reinforcing plate, but the present invention can be applied even when such a reinforcing plate is not provided. Can be implemented. Further, the present invention can be applied not only to hydraulic excavators but also to construction machines such as cranes.

  The present invention is applied to a construction machine configured to fix a stopper, which is a component part of the regulating member, to a bottom portion of the cab using a bolt when a regulating member for regulating displacement of the cab is provided. Can do.

DESCRIPTION OF SYMBOLS 3 Upper revolving body 5 Cab 6 Turning frame 6a Notch part 8 Anti-vibration mount 9A 1st mount support frame 10 Reinforcement plate 10a Notch part 12 Restriction member 13 Stopper receiving part 13a Through-hole 14 Stopper member 16 Stopper 18 Bolt 19 Socket wrench 19a socket 19b torque wrench

Claims (3)

  In a construction machine in which a cab is supported on a flat pivot frame serving as the base of the upper pivot body via an anti-vibration mount, it exceeds the allowable range set in advance in the direction in which the cab is separated from the pivot frame. When the restricting member for restricting displacement is configured using a stopper member fixed to the left side of the bottom portion of the cab and a stopper receiving portion fixed to the left side of the upper surface portion of the swivel frame, the stopper receiving portion is The vibration-proof mount that supports the left side of the cab is provided on a mount support frame that is fixed to the upper surface portion of the revolving frame so as to attach and support, and the stopper member has a diameter larger than that of the through hole formed in the stopper receiving portion. In addition, a stopper located at the intermediate portion between the upper surface portion of the swivel frame and the stopper receiving portion, and the stopper is inserted from below to fix the stopper to the cab. And a bolt fastener that is formed using a bolt that passes through the through hole of the stopper receiving portion and is fastened to the bottom of the cab, and a bolt fastener on the left edge of the swing frame that is positioned below the bolt. A construction machine provided with a cab, characterized in that a notch for inserting the bolt and inserting the bolt from below is formed.   2. The bolt fastener according to claim 1, wherein the bolt fastener is a socket wrench including a socket that engages with a head portion of the bolt and a wrench that rotates the socket, and a notch formed at a left edge of the swivel frame. Is a fan-shaped construction machine that is formed in a fan shape that expands toward the left end of the revolving frame so as to allow the wrench to rotate the socket at least 90 degrees.   3. The mount support frame provided with the stopper receiving portion according to claim 1, wherein the mount support frame is fixed to the swivel frame via a reinforcing plate fixed to the upper surface portion of the swivel frame, and the swivel frame in plan view is fixed to the reinforcing plate. A construction machine equipped with a cab, characterized in that a notch having the same shape is formed in the same part as the notch.

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