Swing machine

Abstract

The slewing work vehicle (1) of the present invention comprises: a lower traveling body (2); an upper slewing body (3); a slewing frame (30) forming the bottom of the upper slewing body (3); a boom bracket (4) rotatably supported on the slewing frame (30); a first longitudinal plate (32) and a second longitudinal plate (33) erected on the bottom plate (31) of the slewing frame (30); and a swing cylinder (41) disposed on the opposite side of the first longitudinal plate (32) across the second longitudinal plate (33). The slewing frame (30) and boom bracket (4) are connected; a tab (38) is provided protruding from the side wall of the second longitudinal plate (33) above the swing cylinder (41) toward the swing cylinder (41); a hose guide (39) is provided on the tab (38); the first and second hydraulic hoses (41c) and (41d) pass through the top of the first longitudinal plate (32) and the second longitudinal plate (33), and pass through the hose guide (39) from top to bottom to reach the swing cylinder (41).

Description

Technical Field

[0001] This invention relates to rotary work vehicles, such as rotary work vehicles with a swing function. Background Technology

[0002] In slewing work vehicles such as backhoe excavators, there is a lower traveling body, an upper slewing body configured to rotate above the lower traveling body, and a work machine supported on the front of the upper slewing body that can rotate up and down.

[0003] Patent document 1 describes a rotary construction machine, wherein the rotary frame of the upper rotary body is composed of a base plate, left and right longitudinal plates extending in the front-back direction and erected on the base plate, and transverse plates fixed at both ends to the left and right longitudinal plates in a state of tilting downwards towards the front. On at least one of the longitudinal plates, a hose insertion hole is provided at a position above the transverse plate for inserting a hydraulic hose extending toward the working machine.

[0004] Furthermore, Patent Document 2 describes a working machine in which at least one plate of the longitudinal and transverse plates of the upper frame (equivalent to a slewing frame) has a pair of protrusions at its upper edge, and an arrangement (such as a hydraulic hose) passes between the pair of protrusions. In Patent Document 2, the arrangement is inserted through a through hole of a sling and the sling is embedded between the pair of protrusions.

[0005] However, in slewing work platforms, to improve maneuverability in confined spaces, they are sometimes equipped with a so-called oscillating function that not only rotates the work machine vertically but also allows its base to rotate horizontally. In slewing work platforms with this oscillating function, a hydraulic oscillating cylinder is mounted on the slewing frame. The cylinder barrel is pivotally connected to the slewing frame, and the piston rod is pivotally connected to the base of the work machine. Through the extension and retraction of the piston rod, the oscillating cylinder rotates horizontally relative to the slewing frame.

[0006] The hydraulic hose arrangement described in Patent Document 1 is suitable for connecting hydraulic hoses to boom cylinders, cantilever cylinders, etc. located above, but not suitable for connecting hydraulic hoses to swing cylinders located below.

[0007] Furthermore, in Patent Document 2, the diameter of the through hole formed in the cable ring is designed to match the diameter of the inserted arrangement without creating a gap, thus making it difficult for the arrangement to slide within the through hole of the cable ring. Therefore, the hydraulic hose inserted into the through hole of the cable ring cannot follow the actuator that rotates relative to the slewing frame, such as a swing cylinder.

[0008] Patent Document 1: Japanese Patent No. 3377198

[0009] Patent Document 2: Japanese Patent Application Publication No. 2013-87423 Summary of the Invention

[0010] The present invention was made in view of the above circumstances, and its object is to provide a rotary work vehicle with a swing function, wherein the hydraulic hose connected to the swing cylinder can follow the swing of the swing cylinder.

[0011] The rotary work vehicle of the present invention includes:

[0012] Lower driving body;

[0013] The upper rotating body is configured to rotate above the aforementioned lower traveling body;

[0014] The rotating frame forms the bottom of the aforementioned upper rotating body;

[0015] The rocker body is horizontally rotatably supported at the front of the aforementioned rotating frame;

[0016] The work machine is supported on the aforementioned rocking body and can rotate up and down;

[0017] The first and second longitudinal plates are positioned on the bottom plate of the aforementioned rotating frame, spaced apart from each other, and are erected in a manner that extends in the front-to-back direction.

[0018] A hydraulic swing cylinder is disposed on the opposite side of the first longitudinal plate, separated by the second longitudinal plate, to connect the rotary frame and the swing body.

[0019] A protrusion is provided from the side wall of the second longitudinal plate, which is located above the swing cylinder, toward the swing cylinder side;

[0020] A hose guide is provided on the aforementioned protrusion; and

[0021] The hydraulic hose passes above the first and second longitudinal plates, and extends from top to bottom through the hose guide to reach the swing cylinder.

[0022] In the rotary work vehicle of the present invention, the hose guide may also be configured such that the hose guide has a recess formed by cutting the protrusion to receive the hydraulic hose, and a sealing member to close the opening end of the recess.

[0023] Alternatively, the rotary work vehicle of the present invention may also be configured to include:

[0024] The working oil tank is located on the left and right outer sides of the aforementioned second longitudinal plate;

[0025] A bracket that secures the lower part of the aforementioned working oil tank to the aforementioned protrusion; and

[0026] The cut is formed by making a cut in the bracket at the position corresponding to the hose guide.

[0027] According to the present invention, a hose guide is provided on a protrusion extending from the upper sidewall of the second longitudinal plate adjacent to the swing cylinder. This allows multiple hydraulic hoses reaching the swing cylinder to be concentrated near the swing cylinder and redistributed. Consequently, when the swing cylinder swings due to its extension and retraction, the hydraulic hoses connected to the swing cylinder can follow the swinging motion of the swing cylinder. Attached Figure Description

[0028] Figure 1 This is a perspective view showing an example of a rotary work vehicle according to the present invention.

[0029] Figure 2 It is a 3D view of a rotating frame.

[0030] Figure 3 This is a top view of the rotating frame.

[0031] Figure 4 This is a magnified 3D view of the hose guide.

[0032] Figure 5 It is an exploded 3D view of the rotating frame and the working oil tank.

[0033] Figure 6 It is a magnified 3D view showing the installation location of the working oil tank. Detailed Implementation

[0034] The embodiments of the present invention will be described with reference to the accompanying drawings.

[0035] [Overview of the slewing machine]

[0036] like Figure 1 As shown, the slewing machine 1 includes a lower traveling body 2, an upper slewing body 3 configured to rotate above the lower traveling body 2, a boom bracket 4 supported horizontally on the upper slewing body 3, and a work machine 5 supported vertically on the boom bracket 4. The slewing machine 1 is configured as an excavator (backhoe excavator) with a boom swing function. Generally, the boom swing function is equipped on small excavators that require operation in confined spaces.

[0037] The lower traveling body 2 is driven by power from the engine 60, enabling the slewing vehicle 1 to travel or rotate. The lower traveling body 2 has a pair of left and right tracks 21, 21 and a pair of left and right travel motors 22, 22 that drive them. In addition, the lower traveling body 2 is provided with a pair of scraper arms 23, 23, a scraper 24 extending in the left and right direction between their front ends as a soil discharge plate, and a scraper cylinder 25 for rotating the scraper 24 up and down.

[0038] The upper rotating body 3 is configured to rotate around an axis extending vertically at its center. The upper rotating body 3 is equipped with an engine 60, a rotary motor 61, and a control unit 62. The control unit 62 is equipped with a control seat and operating devices.

[0039] The boom bracket 4 is mounted to the front end of the upper slewing body 3 via the mounting part 35. The boom bracket 4 is supported on the mounting part 35 so as to rotate freely horizontally (i.e., swing freely left and right). A swing cylinder 41 that extends and retracts in the front-rear direction is provided between the upper slewing body 3 and the boom bracket 4 (see reference). Figure 2 as well as Figure 3 The horizontal rotation of the boom bracket 4 is achieved by the extension and retraction of the swing cylinder 41.

[0040] The work machine 5 is driven by power from the engine 60 and performs tasks such as digging sand and soil according to the operation of the control unit 62. The work machine 5 is rotatably supported on the boom bracket 4. A pivot pin 54 is provided on the boom bracket 4 to orient the axis horizontally. The base end of the work machine 5 (the base end of the boom 51 described later) is supported so that it can rotate freely up and down around the pivot pin 54. In addition, the work machine 5 can swing in conjunction with the horizontal rotation of the boom bracket 4.

[0041] The work machine 5 includes a boom 51, a cantilever 52, and a bucket 53. The boom 51 is rotatably mounted on a boom bracket 4. The boom 51 extends vertically from its base supported on the boom bracket 4, and when viewed from the side, it curves in a dart shape. A retractable boom cylinder 51a is provided between the boom bracket 4 and the middle section of the boom 51. The vertical rotation of the boom 51 relative to the boom bracket 4 is achieved by the extension and retraction of the boom cylinder 51a.

[0042] The cantilever 52 is rotatably mounted on the boom 51. A pivot pin 55 is provided at the front end of the boom 51, oriented horizontally. The base end of the cantilever 52 is supported so that it can rotate freely up and down (forward and backward) around the pivot pin 55. A cantilever cylinder 52a, which can move freely in extension and retraction, is provided between the middle part of the boom 51 and the base end of the cantilever 52. The up and down rotation of the cantilever 52 relative to the boom 51 is achieved by the extension and retraction of the cantilever cylinder 52a.

[0043] The bucket 53 is rotatably mounted on the boom 52. A pivot pin 56 is provided at the front end of the boom 52, oriented horizontally. The base end of the bucket 53 is supported so that it can rotate freely up and down (forward and backward) around its pivot pin 56. A bucket connecting rod 57 is sandwiched between the front end of the boom 52 and the bucket 53. The bucket connecting rod 57 is configured as a link that transmits driving force to the bucket 53. A bucket cylinder 53a is provided between the bucket connecting rod 57 and the base end of the boom 52, and can move freely in extension and retraction. The up and down rotation of the bucket 53 relative to the boom 52 is achieved by the extension and retraction of the bucket cylinder 53a.

[0044] The upper slewing body 3 carries the engine 60, battery, fuel tank, etc. on the slewing frame 30, and is covered by the engine cover 66. The control unit 62 is arranged at the front of it. A hydraulic pump 63 is connected to the engine 60 and is driven by the engine 60 to discharge working oil. The working oil discharged from the hydraulic pump 63 is supplied to the swing cylinder 41, boom cylinder 51a, cantilever cylinder 52a, bucket cylinder 53a, scraper cylinder 25, travel motor 22, and slewing motor 61, etc., via hydraulic hoses and the control unit 64 (described later).

[0045] The slewing frame 30 includes a flat base plate 31, a first longitudinal plate 32, and a second longitudinal plate 33. Additionally, the slewing frame 30 has an upper plate 34 above the base plate 31 for fixing the front end of the operating unit 62. The upper plate 34 is fixed to the upper ends of a pair of front supports 34a, 34a, which are erected at the front end of the base plate 31.

[0046] The base plate 31 is formed into a circle with its front end cut off in the left-right direction when viewed from above. A first longitudinal plate 32 and a second longitudinal plate 33 are spaced apart on the base plate 31 and are erected in a forward-backward direction. The first longitudinal plate 32 is positioned to the left of the center of the rotating frame 30, and the second longitudinal plate 33 is positioned to the right of the center of the rotating frame 30. The base plate 31 between the first longitudinal plate 32 and the second longitudinal plate 33 has a connector opening 31a for inserting a rotary joint and a motor opening 31b for mounting the rotary motor 61. Additionally, the base plate 31 has multiple other openings for drainage and maintenance.

[0047] The lower edges of the first longitudinal plate 32 and the second longitudinal plate 33 are welded to the upper surface of the base plate 31. The front ends 32a of the first longitudinal plate 32 and the front ends 33a of the second longitudinal plate 33 protrude forward from the base plate 31, forming part of the mounting portion 35. In addition, the rear end 32b of the first longitudinal plate 32 is connected to the third longitudinal plate 36 via the connecting portion 36a. The third longitudinal plate 36 is erected so as to extend from near the center of the base plate 31 to the rear end in a front-rear direction. The second longitudinal plate 33 extends to the rear end of the base plate 31.

[0048] A mounting portion 35 for mounting the boom bracket 4 is provided at the front end of the slewing frame 30, protruding forward. The mounting portion 35 is conical when viewed from above, and has an insertion hole 35a (not shown) at its front end, opening vertically for inserting a pivot pin. The mounting portion 35 has a pair of upper and lower support bars 351 and 352 spaced apart from each other. The upper support bar 351 is mounted to the upper plate 34, protruding forward. The lower support bar 352 is mounted to the front upper surface of the base plate 31, protruding forward from the front end of the base plate 31. The pair of support bars 351 and 352 clamp the front ends 32a of the first longitudinal plate 32 and the second longitudinal plate 33 from above and below.

[0049] A control unit 64 is disposed on the left side of the first longitudinal plate 32. The control unit 64 is equipped with control valves for controlling the operation of hydraulic cylinders (swing cylinder 41, boom cylinder 51a, cantilever cylinder 52a, bucket cylinder 53a, scraper cylinder 25) and hydraulic motors (travel motors 22, 22, swing motor 61). The control unit 64 includes at least a control valve for controlling the operation of the swing cylinder 41.

[0050] A swing cylinder 41 is arranged along the front-rear direction on the right side of the second longitudinal plate 33. The cylinder barrel 41a of the swing cylinder 41 is rotatably supported on the cylinder mounting portion 37 formed in the slewing frame 30, and the piston rod 41b is rotatably connected to the boom bracket 4. By extending or retracting the piston rod 41b, the boom bracket 4 can be rotated left and right. Simultaneously, the swing cylinder 41 swings left and right around the cylinder mounting portion 37.

[0051] A protrusion 38 protruding to the right (towards the swing cylinder 41) is provided on the upper side wall of the second longitudinal plate 33. The protrusion 38 is located above the swing cylinder 41. The protrusion 38 is a plate-shaped plate that extends horizontally. The protrusion 38 is welded to the second longitudinal plate 33.

[0052] A hose guide 39 is provided on the tab 38. First and second hydraulic hoses 41c and 41d, connecting the control unit 64 and the swing cylinder 41, pass through the hose guide 39. The first and second hydraulic hoses 41c and 41d extend from the control unit 64, passing over the first longitudinal plate 32 and the second longitudinal plate 33, downwards through the hose guide 39 to reach the swing cylinder 41. The hose guide 39 is configured such that, when viewed from above, a portion overlaps with the cylinder barrel 41a of the swing cylinder 41 (see reference). Figure 3Therefore, the first hydraulic hose 41c reaching the cylinder barrel 41a side and the second hydraulic hose 41d reaching the piston rod 41b side can be concentrated near the swing cylinder 41, and the first and second hydraulic hoses 41c and 41d can be redistributed. Thus, when the swing cylinder 41 is oscillating, the first and second hydraulic hoses 41c and 41d can follow the oscillation of the swing cylinder 41. In addition, a hose guide 39 is provided in the protrusion 38, so it is not necessary to form holes for the hydraulic hoses to pass through the first longitudinal plate 32 and the second longitudinal plate 33, and therefore it is not necessary to add reinforcements to the first longitudinal plate 32 and the second longitudinal plate 33.

[0053] Figure 4 This is an enlarged view of the hose guide 39. The hose guide 39 includes a recess 38a formed by cutting at the protruding end of the tab 38, and a closing member 39a that closes the opening end of the recess 38a. The recess 38a is cut into a generally U-shape to accommodate the first and second hydraulic hoses 41c and 41d. The recess 38a is sized to allow the first and second hydraulic hoses 41c and 41d to slide.

[0054] The sealing component 39a is a metal round bar shaped into a roughly U-shape. Both ends of the sealing component 39a are fixed to the opening of the recess 38a by welding or the like. The sealing component 39a is configured such that the right side is higher than the left side. The sealing component 39a prevents the first and second hydraulic hoses 41c and 41d from detaching from the recess 38a. Because the sealing component 39a is formed of a round bar, it is difficult to damage even if the first and second hydraulic hoses 41c and 41d come into contact or slide.

[0055] On the right side of the second longitudinal plate 33, as shown Figure 5 The configuration shown includes a working oil tank 65. The working oil tank 65 stores the working oil of the hydraulic pump 63 and is connected to the hydraulic pump 63 via a hydraulic hose (not shown). The working oil tank 65 is located at the center of the right end of the slewing frame 30 in the front-rear direction. The lower end of the working oil tank 65 is fixed to the base plate 31.

[0056] The working oil tank 65 is configured to overlap with the swing cylinder 41 when viewed from above. A recess 65a extending in the front-rear direction is formed in the lower left part of the working oil tank 65 to prevent interference with the swing cylinder 41. The recess 65a of the working oil tank 65 is fixed to the protrusion 38 via a bracket 651. One end of the bracket 651 is fixed to the recess 65a, and the other end extends beyond the left end of the working oil tank 65.

[0057] A cutout 651a, roughly U-shaped, is provided at the left end of the bracket 651. When the bracket 651 is fixed to the tab 38 with bolts 652, the cutout 651a is positioned corresponding to the hose guide 39, that is, corresponding to the recess 38a of the tab 38. Thus, the hose guide 39 allows the first and second hydraulic hoses 41c and 41d to stably run along the cutout 651a of the bracket 651 of the working oil tank 65, effectively utilizing the space within the housing 66. Furthermore, since the first and second hydraulic hoses 41c and 41d pass through the hose guide 39 and are arranged along the cutout 651a of the bracket 651 of the working oil tank 65, even with the working oil tank 65 located near the first and second hydraulic hoses 41c and 41d, assembly of other components after hose installation is easy.

[0058] This invention is not limited to any of the embodiments described above, and various improvements and modifications can be made without departing from the spirit of this invention.

[0059] Explanation of reference numerals in the attached figures

[0060] 1…Slewing work vehicle; 2…Lower traveling body; 3…Upper slewing body; 4…Boom bracket; 5…Working machine; 30…Slewing frame; 31…Base plate; 32…First longitudinal plate; 33…Second longitudinal plate; 35…Mounting part; 38…Protrusion; 38a…Recess; 39…Hose guide; 39a…Sealing component; 41…Swing cylinder; 41c…First hydraulic hose; 41d…Second hydraulic hose; 63…Hydraulic pump; 65…Working oil tank; 651…Bracket; 651a…Slit.

Claims

1. A rotary work vehicle, wherein, have: Lower driving body; The upper rotating body is configured to rotate above the lower traveling body; The rotating frame forms the bottom of the upper rotating body; The rocker body is horizontally rotatably supported at the front of the rotating frame; The work machine is rotatably supported on the swing body; The first and second longitudinal plates are located on the bottom plate of the rotating frame at intervals on the left and right, and are erected in a manner that extends in the front-to-back direction. A hydraulic swing cylinder is located on the side of the second longitudinal plate opposite to the first longitudinal plate, connecting the rotating frame and the swing body; A tab is provided protruding from the side wall of the second longitudinal plate, which is located above the swing cylinder, toward the swing cylinder side; A hose guide is disposed on the protrusion; and The hydraulic hose passes above the first and second longitudinal plates, and extends from top to bottom through the hose guide to reach the swing cylinder.

2. The slewing work vehicle according to claim 1, wherein, The hose guide has a recess formed by cutting into the protrusion to receive the hydraulic hose, and a closing member to close the open end of the recess.

3. The slewing work vehicle according to claim 1 or 2, wherein, have: The working oil tank is located on the left and right outer sides of the second longitudinal plate; A bracket that secures the lower part of the working oil tank to the protrusion; and The cut is formed by making a cut in the bracket at the position corresponding to the hose guide.

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