JP2010106522A - Swivel-type construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a swivel-type construction machine which has a supporting frame structure of an equipment cover capable of easily securing a space for inserting and extracting a connecting pin for attaching a working attachment to a swivel frame. <P>SOLUTION: The connecting pin 13 of the working attachment is attached to a vertical plate 8 on the swivel frame 6. A cab is mounted to one side of the swivel frame 6, and hydraulic equipment is mounted to the other side thereof. Front and rear supporting frames 47 and 48 are provided as supporting frames for supporting the equipment cover for the hydraulic equipment. A space between a fuel tank 17 and a hydraulic oil tank 18 is positioned on the extension of the connecting pin 13. The rear supporting frame 48 is divided into an outside frame 50 and an inside frame 51 which is fixed to the hydraulic oil tank 18. The outside frame 50 is formed in an inverted L-shape which comprises a vertical frame 50a and an upper frame 50b integrally elongated inward from the top of the vertical frame 50a. When the connecting pin 13 is inserted and extracted, the space for inserting and extracting the connecting pin 13 is secured by detaching the outside frame 50 and a lateral cover 44. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a swivel construction machine such as a hydraulic excavator or an application machine thereof, and more particularly, to an equipment cover configured so that a connecting pin of a boom foot part of a work attachment attached to a swivel frame can be easily inserted and removed. The present invention relates to the structure of the support frame.

  A hydraulic excavator suitable for excavation work and its applied machines have an upper swing body installed on a lower traveling body, and a work attachment consisting of a work tool such as a boom, an arm, and a bucket at the end of the arm is attached to the upper swing body. Installed and configured.

  The revolving frame constituting the upper revolving structure has a bottom plate and a pair of left and right vertical plates provided on the bottom plate in the front-rear direction. The work attachment has a structure in which a connection pin is inserted into a boss provided in the boom foot portion and a pin hole provided in a vertical plate of the revolving frame to attach the work attachment to the revolving frame. Here, for example, in a medium-sized hydraulic excavator having a weight of 30 t class or more, the dimension in the front-rear direction of the turning frame is set large. For this reason, there is a margin in the arrangement space for equipment covers such as cabs and control valves on the revolving frame, and counterweights.

  In such a medium-sized or larger hydraulic excavator, in order to secure a work space when inserting and removing the connecting pin with respect to the boss of the vertical plate of the revolving frame, the equipment cover is provided at a position avoiding the extension line in the connecting pin insertion direction. In addition, a counter weight or the like can be arranged.

  On the other hand, a small turning type hydraulic excavator is known in which the protruding length of the rear end portion of the counterweight is suppressed and the turning radius is made small. In this small swivel excavator, the length of the swivel frame in the front-rear direction is set short so that the rear end side of the counterweight does not protrude rearward from the lower traveling body.

  For this reason, in the small swing type hydraulic excavator, the space for arranging the cab, device cover, counterweight, etc. on the swing frame is limited, and hydraulic devices such as control valves are also installed on the extension line in the insertion direction of the connecting pin. It becomes necessary to arrange.

  However, when a hydraulic device is arranged on an extension line in the insertion direction of the connecting pin, the connecting / extracting operation of the connecting pin is hindered by the hydraulic device and a device cover protecting the hydraulic device. For this reason, a space for inserting and removing the connecting pin is provided between the hydraulic device and a tank device including a fuel tank or a hydraulic oil tank. And when removing the connection pin from the vertical plate to remove the work attachment from the vertical plate, first remove the device cover, then pull the connection pin through the space between the tank device and the hydraulic device, Attachment needs to be removed from the vertical plate.

  Patent Document 1 proposes a device cover that is divided into a main body cover and a detachable cover in order to facilitate the detaching operation of the device cover when the connecting pin is inserted and removed. Here, the main body cover covers from the front surface to the upper surface of the hydraulic equipment, and the removable cover is detachable between the main body cover and the tank device, that is, on the extension line of the connecting pin axis (insertion / removal direction). And covers the rear upper surface and the rear outer surface of the hydraulic device. If comprised in this way, a connection pin can be inserted / removed only by removing only the attachment / detachment cover reduced in size and weight at the rear of the device cover. The support frame of the device cover described in Patent Document 1 includes a front support frame and a rear support frame. The front support frame supports the rear part of the main body cover and the front part of the detachable cover. The rear support frame is located in the vicinity of the front surface of the tank device and supports the rear portion of the detachable cover. In the device cover described in Patent Document 1, the space between the rear support frame that supports the device cover and the hydraulic device is used as a work space when the connecting pin is inserted and removed.

JP 2001-90109 A

  In the small turning type hydraulic excavator, the front and rear length of the turning frame is shortened and the capacity of the tanks needs to be secured, so the distance between the hydraulic device and the rear support frame in front of the tank is narrowed. For this reason, as described in Patent Document 1, even if the device cover is divided into a main body cover and a detachable cover, and the detachable cover is removed when the linking pin is inserted and removed, the hydraulic device for inserting and removing the linking pin is used. There is a problem that the space between the rear support frame and the rear support frame is narrow, resulting in a tight working environment.

  In view of the above problems, the present invention provides a swivel construction machine having a support frame structure of an equipment cover having a configuration that can easily secure a space for inserting and removing a connecting pin for attaching a work attachment to a swivel frame. Objective.

The swivel construction machine according to claim 1 includes a lower traveling body, an upper revolving body installed on the lower traveling body so as to be capable of swiveling, and a work attachment attached to the upper revolving body.
The upper revolving body includes a revolving frame having a bottom plate and a pair of vertical plates provided extending in the front-rear direction of the bottom plate, and a boom foot portion of the working attachment provided through the vertical plate in the left-right direction. A connecting pin that connects the pair of vertical plates, a cab that is located on the front side of the swivel frame and that is provided on one side in the left-right direction across the pair of vertical plates, and the pair of vertical plates that are located on the front side of the swivel frame A hydraulic device provided on the other side sandwiched, a tank device provided on the rear side of the hydraulic device in the swing frame with a space from the hydraulic device, a device cover covering the hydraulic device, and the swing frame A swivel construction machine comprising a front support frame and a rear support frame that are provided above and support the equipment cover, wherein an extension line of the connecting pin is located between the hydraulic equipment and the tank device. ,
The rear support frame is divided into an outer frame and an inner frame fixed to the tank device,
The outer frame is configured in an inverted L shape consisting of a vertical frame part and an upper frame part integrally extending inward from the top of the vertical frame part,
The outer frame is characterized in that the upper frame part is detachably coupled to the inner frame by bolts, and the vertical frame part is detachably coupled to the swivel frame by bolts.

The swivel construction machine according to claim 2 is the swivel construction machine according to claim 1,
The outer frame is further detachably fixed to the tank device with bolts.

  In the first aspect of the invention, when the connecting pin is inserted and removed, the outer frame and the side cover of the rear support frame of the device cover are removed from the revolving frame and the inner frame. Thereby, the space occupied by the rear support frame is added as a work space for inserting / removing the connection pin of the work attachment, and the connection pin can be easily inserted / removed, and the connection / removal operation of the connection pin is facilitated.

  Further, the outer frame is composed of a vertical frame portion and an upper frame portion integrally extending from the top of the vertical frame portion to the inside, and the upper frame portion is fixed to the inner frame with bolts. The outer frame is more rigid and the strength of the outer frame and the inner frame is improved compared to the case where only the frame is configured and connected to the inner frame with bolts, and the outer frame is twisted as the side cover is opened and closed. Is prevented from occurring.

  According to the invention of claim 2, since the outer frame is also fixed to the tank device, the mounting strength of the outer frame is improved.

  FIG. 1 is a side view showing an embodiment of a swivel construction machine according to the present invention, and FIG. 2 is a plan view thereof. This construction machine constitutes a small turning type. 1 and 2, 1 is a lower traveling body having a traveling motor (not shown), 2 is a soil removal plate attached to the frame of the lower traveling body 1 so as to be able to swing up and down, and 3 is swiveled to the lower traveling body 1. An upper swing body 5 installed via the device 4 is a work attachment. In this example, the lower traveling body 1 is illustrated as having a crawler belt, but may be configured as a wheel type.

  FIG. 3 is a plan view showing a part of the revolving frame 6 of the upper revolving structure 3 and parts mounted thereon, and FIGS. 4 and 5 are enlarged sectional views taken along lines AA and AB, respectively. As shown in FIGS. 3 to 5, the revolving frame 6 includes a bottom plate 7 and a pair of vertical plates 8 and 8 provided to extend in the front-rear direction of the bottom plate 7. A cab mounting portion 9 is provided on one side in the left-right direction between the vertical plates 8 and 8 located on the front side of the revolving frame 6, and the cab 10 shown in FIGS. 1 and 2 is mounted thereon. Further, the hydraulic power unit 12 shown in FIGS. 1 and 2 is mounted on the hydraulic power unit mounting portion 11 provided at the rear portion of the revolving frame 6. Reference numeral 13 denotes a connecting pin for connecting the boom foot portion of the work attachment 5, and the connecting pin 13 is attached by being inserted into the pin holes 8 a of the left and right vertical plates 8.

  A bracket 14 shown in FIG. 6 is fixed to the bottom plate 7 so that the vertical plates 8 and 8 are sandwiched between the cab 10 and the cab 10 on the front side of the revolving frame 6. A control valve 15 as a hydraulic device is installed on the bracket 14. The control valve 15 includes a traveling motor for the lower traveling body 1, a hydraulic cylinder for swinging up and down the earth discharging plate 2, a swinging motor for the swinging device 4, and hydraulic cylinders to be described later provided at each joint portion of the work attachment 5. It is an aggregate of a plurality of control valves provided for actuator control. Reference numeral 17 denotes a fuel tank, and 18 denotes a hydraulic oil tank. In the present specification, these may be collectively referred to as a tank device. The fuel tank 17 and the hydraulic oil tank 18 are mounted on the left and right of the revolving frame behind the control valve 15. An interval for inserting and removing the connecting pin 13 is provided between the control valve 15 and the tank device. As shown in FIG. 7, the front surfaces of the fuel tank 17 and the hydraulic oil tank 18 are close to the axial center of the connecting pin 13, that is, the extension in the insertion / removal direction.

  As shown in FIGS. 1 and 2, the working attachment 5 of this embodiment includes a first boom 20 that is connected by a connecting pin 13 with a foot portion inserted between the vertical plates 8 and 8 of the revolving frame 6. The hydraulic cylinder 22 for raising and lowering the first boom 20 provided between the bracket 21 (see FIG. 3) provided at the front portion of the vertical plate 8 and the first boom 20 and the front end of the first boom 20 A second boom 24 mounted so as to be swingable in the left-right direction around the pin 23, and a hydraulic cylinder 25 provided between the first boom 20 and the second boom 24 and swinging the second boom 24 left and right; The third boom 27 is attached to the tip of the second boom 24 so as to be able to swing left and right around the vertical pin 26, and these booms 20 are always parallel to the first boom 20. , 27 connected to both ends , An arm 31 attached to the tip of the third boom 27 so as to be pivotable in the vertical direction around the pin 30, a hydraulic cylinder 32 that pivots the arm 31, and a pin 33 at the tip of the arm 31. The bucket 35 is rotatably mounted, and includes a hydraulic cylinder 36 and a link mechanism 37 provided between the arm 31 and the bucket 35 for rotating the bucket 35.

  In addition, as the configuration of the work attachment 5, various types such as a standard type in which a U-shaped boom is directly connected to the arm 31 can be adopted, and the work tool is disassembled in addition to the bucket 35. Various types according to the work purpose such as crushing, gripping and cutting can be attached.

  As shown in the perspective views of FIGS. 8, 9, and 10, the device cover 40 that covers the control valve 15 includes a main body cover 41 that covers the front surface, inner surface, and upper surface of the control valve 11, and the main body cover 41 and the fuel tank 17. And interpolation covers 42 and 43 for interpolating between the hydraulic oil tank 18 and an openable / closable side cover 44 that covers the outer surface of the control valve 15. A protective cover 45 covers the hydraulic oil tank 18. As shown in FIGS. 10 and 11, a front support frame 47 and a rear support frame 48 are provided as support frames for supporting the covers 41 to 43. As shown in FIG. 12, the rear support frame 48 has a structure divided into an outer frame 50 and an inner frame 51 each having an L shape.

  As shown in FIG. 11, the inner frame 51 is fixed to the upper surface of the hydraulic oil tank 18 by bolts 52. The front support frame 47 has an L-shaped cross section and an inverted L shape as a whole. Reference numeral 80 denotes a mounting bracket for mounting the front support frame 47, and the mounting bracket 80 is welded to the upper horizontal portion of the cylindrical portion 49 in the peripheral portion of the revolving frame 6. The front support frame 47 has its lower end fixed to the mounting bracket 80 with bolts 81.

  As shown in FIGS. 8 and 10, the interpolation cover 42 includes a vertical plate portion 42 a, an upper plate portion 42 b, and a bent portion 42 c below the front edge of the upper plate portion 42 b. An arc-shaped notch 42 d is provided at the lower rear portion of the vertical plate portion 42 a of the interpolation cover 42 for inserting and removing the connecting pin 13. An arcuate cutout 45a is also provided below the protective cover 45 of the hydraulic oil tank 18 so that the connecting pin 13 can be inserted and removed. As shown in FIGS. 10 and 11, a mounting bracket 53 having a screw hole for attaching the interpolation cover 42 is welded to the outer surface of the vertical plate 8, and the vertical direction of the interpolation cover 42 is shown in FIGS. 8 and 10. The lower portion of the plate portion 42a is fixed to the mounting bracket 53 with bolts 54. Further, as shown in FIG. 10, a bent portion 42 c that is bent downward from the front edge of the upper plate portion 42 b is fixed to the upper frame portion of the front support frame 47 by a bolt 55. Further, as shown in FIG. 8, the rear portion of the upper plate portion 42 b is fixed to the inner frame 51 together with the protective cover 45 of the hydraulic oil tank 18 by a bolt 56.

  In FIG. 11, reference numeral 57 denotes a mounting bracket having a screw hole for mounting the main body cover 41, and the mounting bracket 57 is welded to the upper horizontal portion of the cylindrical portion 49 at the periphery of the turning frame 6. As shown in FIGS. 8 and 9, the lower end of the front plate portion 41 a of the main body cover 41 is fixed to the mounting bracket 57 with bolts (not shown). Further, the rear end of the upper plate portion 41b of the main body cover 41 is fixed to the upper frame portion of the front support frame 47 with bolts 58, and the upper plate portion 41b is fixed to the upper plate portion 42b of the interpolation cover 42 with bolts 59. . Further, the vertical plate portion 41 c inside the main body cover 41 is fixed to the vertical plate portion 60 provided on the revolving frame 6 and the vertical plate portion 42 a of the interpolation cover 42 with bolts 61 and 62. As shown in FIGS. 8 and 9, the interpolation cover 43 is fixed on the interpolation cover 42 with bolts 63.

  As shown in FIGS. 10, 11, and 12, the outer frame 50 of the rear support frame 48 has an L-shaped cross-sectional shape and an inverted L-shaped overall shape. That is, the outer frame 50, the vertical frame portion 50a, and the upper frame portion 50b formed integrally by bending inward from the top of the vertical frame portion 50a. In FIG. 11, 49A is a tank device mounting portion of the revolving frame 6, and 64 is a mounting bracket having a screw hole for mounting the outer frame 50 welded to the mounting portion 49A. As shown in FIG. 10, the outer frame 50 detachably fixes the lower end portion of the vertical frame portion 50 a to the mounting bracket 64 with bolts 65. As shown in FIGS. 10 to 12, the upper frame portion 50 b of the outer frame 50 is attached to a mounting bracket 66 having a screw hole provided in the front plate portion of the fuel tank 17 and a screw at the outer end portion of the inner frame 51. The connecting portion 51a having a hole is detachably fixed by bolts 67 and 68.

  Screw holes 70 and 71 are provided in the vertical frame portion 50a of the outer frame 50 with a space in the vertical direction, and as shown in FIGS. 4 and 5, the bolts 72 that are screwed into the screw holes 70 and 71 are opened and closed. The attachment plate 73 of the side cover 44 is fixed detachably. An openable / closable side cover 44 is attached to the mounting plate 73 so as to be openable and closable around the pivot portion 74.

  In this configuration, when attaching / detaching the connection pin 13 to / from the vertical plate 8 or the boom foot portion of the first boom 20 when attaching / detaching the work attachment 5, the side cover 44 is opened as shown in FIGS. Then, the bolt 72 shown in FIG. 5 is removed, and the side cover 44 is removed from the outer frame portion 50 together with the mounting plate 73 of the side cover 44 as shown in FIG. Next, the bolts 65, 67, and 68 are removed, and the outer frame portion 50 is removed from the revolving frame 6, the fuel tank 17, and the inner frame 51.

  Thus, in the state where the outer frame 50 is removed together with the side cover 44, the outer frame 50 does not interfere with the insertion / removal of the connecting pin 13 as shown in FIG. Since the outer frame 50 expands the work space for extracting the connecting pins 13, the work for inserting and removing is facilitated.

  The outer frame 50 includes a vertical frame portion 50a and an upper frame portion 50b that extends integrally from the top of the vertical frame portion 50a. The upper frame portion 50b is fixed to the inner frame 51 with bolts 68. Therefore, the rigidity of the outer frame 50 is improved and the coupling strength between the outer frame 50 and the inner frame 51 is improved as compared with the case where the outer frame 50 is configured only by the vertical frame and is connected to the inner frame 51 by bolts. Thus, it is possible to prevent the outer frame 50 from being twisted as the side cover 44 is opened and closed.

  Further, according to the present embodiment, since the outer frame 50 is also fixed to the fuel tank 17, the mounting strength of the outer frame 50 is improved.

  When carrying out the present invention, the side cover 44 may be configured to be detached from the turning frame 6 together with the outer frame 50 at the same time. Alternatively, the side cover 44 may be attached to the front support frame 47 and another side cover may be attached between the rear support frame 48 and the front support frame 47.

1 is a side view showing an embodiment of a swivel construction machine according to the present invention. It is a top view of FIG. It is a top view which shows the turning frame of this Embodiment in the state which mounted some apparatuses. It is AA expanded sectional drawing of FIG. It is AB sectional drawing of FIG. It is a top view which shows the positional relationship of the connection pin of this Embodiment, a tank apparatus, and a control valve. It is a side view which shows the positional relationship of the connection pin of this Embodiment, a tank apparatus, and a control valve. It is the perspective view which looked at the turning frame of this Embodiment, an apparatus cover, a tank apparatus, etc. from the diagonally left front of the construction machine. It is the perspective view which looked at the turning frame of this Embodiment, an apparatus cover, a tank apparatus, etc. from the diagonally right front of the construction machine. It is a perspective view which removes a part of apparatus cover and shows the turning frame, apparatus cover, tank apparatus, etc. of this Embodiment. It is a perspective view which shows the relative positional relationship of the apparatus cover support frame of this Embodiment, and a connection pin. It is a perspective view which shows the principal part structure of this Embodiment.

Explanation of symbols

1: Lower traveling body, 2: Discharge plate, 3: Upper revolving body, 5: Work attachment, 6: Revolving frame, 7: Bottom plate, 8: Vertical plate, 9: Cab mounting part, 10: Cab, 11: Hydraulic power unit mounting portion, 12: hydraulic power unit, 13: connecting pin, 14: bracket, 15: hydraulic equipment (control valve), 17: fuel tank, 18: hydraulic oil tank, 20: first boom, 21: bracket, 22 : Hydraulic cylinder, 23: Vertical pin, 24: Second boom, 25: Hydraulic cylinder, 26: Vertical pin, 27: Third boom, 28: Parallel link, 30: Pin, 31: Arm, 32: Hydraulic cylinder, 33 : Pin, 35: Bucket, 36: Hydraulic cylinder, 37: Link mechanism, 40: Equipment cover, 41: Body cover, 42, 43: Interpolation cover, 44: Side cover, 45: Actuation Tank protective cover, 47: front support frame, 48: rear support frame, 49: cylindrical part, 49A: tank device mounting part, 50: outer frame, 50a: vertical frame part, 50b: upper frame part, 51: inner frame 52, 54, 55, 56: bolt, 53, 57: mounting bracket, 60: vertical plate portion, 61, 62, 63: bolt, 64, 66: mounting bracket, 65, 67, 68: bolt, 70, 71 : Screw hole, 72: Bolt, 73: Mounting plate, 80: Mounting bracket, 81: Bolt

Claims (2)

It consists of a lower traveling body, an upper revolving body installed on the lower traveling body so as to be able to swivel, and a work attachment attached to the upper revolving body.
The upper revolving body includes a revolving frame having a bottom plate and a pair of vertical plates provided extending in the front-rear direction of the bottom plate, and a boom foot portion of the working attachment provided through the vertical plate in the left-right direction. A connecting pin that connects the pair of vertical plates, a cab that is located on the front side of the swivel frame and that is provided on one side in the left-right direction across the pair of vertical plates, and the pair of vertical plates that are located on the front side of the swivel frame A hydraulic device provided on the other side sandwiched, a tank device provided on the rear side of the hydraulic device in the swing frame with a space from the hydraulic device, a device cover covering the hydraulic device, and the swing frame A swivel construction machine comprising a front support frame and a rear support frame that are provided above and support the equipment cover, wherein an extension line of the connecting pin is located between the hydraulic equipment and the tank device. ,
The rear support frame is divided into an outer frame and an inner frame fixed to the tank device,
The outer frame is configured in an inverted L shape consisting of a vertical frame part and an upper frame part integrally extending inward from the top of the vertical frame part,
The outer frame has the upper frame portion detachably coupled to the inner frame by bolts, and the vertical frame portion is detachably coupled to the swivel frame by bolts and attached. machine. The swivel construction machine according to claim 1,
The outer frame is further detachably fixed to the tank device with bolts.

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