JP2017025658A - Hydraulic excavator with crane hook - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hydraulic excavator with a crane hook that can prevent a cable from being damaged.SOLUTION: A cable is routed along a first link attached with a proximity switch, extended and routed from the inside to the outside of a second link at the tip of the second link connected to the first link via a through-hole formed while being opened to the left and right direction, and passed in a cable cover extended and attached in the longitudinal direction in an outer side surface of the second link to be extended, routed and supported. The cable routed in the cable cover is configured to integrally swing and operate with the second link for swinging and operating around a base end in conjunction with the swinging operation of a bucket.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a hydraulic excavator with a crane hook, and more particularly to a hydraulic excavator with a crane hook having a cable wiring structure connected to a proximity switch for detecting whether or not the crane hook is in a use posture when performing crane work.

  Conventionally, there exists what was disclosed by patent document 1 as one form of the hydraulic shovel with a crane hook. That is, Patent Document 1 includes a working unit that can selectively perform crane work and excavation work, and the working part includes an arm, a bucket attached to the tip of the arm, and a bucket that swings the bucket. A bucket link mechanism interposed between the bucket cylinder, the bucket and the arm, and a crane hook attached to the bucket link mechanism. The bucket link mechanism includes a pair of left and right first links and a pair of left and right links. The first link has a base end connected to the back base of the bucket, a tip connected coaxially to the tip of the bucket cylinder and the tip of the second link, The base end of the two links is connected to the tip of the arm, and the crane hook is flipped upward and placed between the pair of left and right first links, and is suspended downward and left The use posture arranged outside the pair of first links is freely changeable, and either one of the left and right first links is provided with a proximity switch for detecting the crane hook in the storage posture. A structure in which a cable for transmitting a detection signal is connected is disclosed.

JP 2002-68671 A

  However, in Patent Document 1 described above, since the middle part of the cable is located between the upper surface side of the arm and the inner surface side of the second link, inclusions are interposed between the arm and the second link during excavation work. Then, the middle part of the cable is worn and pinched by inclusions, and may be damaged. Also, grease that comes out between the boss provided at the tip of the arm and the base end of the second link pivotally supported by the boss via the pivot sticks to the cable, and the cable becomes dirty. In this case, there is a possibility that the coating of the cable is denatured by the grease and is damaged in this case.

  Then, an object of this invention is to provide the hydraulic shovel with a crane hook which can prevent that a cable is damaged.

The invention described in claim 1
It is equipped with a working section that enables selective crane work and excavation work,
The working unit includes an arm, a bucket attached to the tip of the arm, a bucket cylinder that swings the bucket, a bucket link mechanism interposed between the bucket cylinder, the bucket, and the arm, and a bucket link mechanism. An attached crane hook, and
The bucket link mechanism includes a pair of left and right first links and a pair of left and right second links. The first link connects the base end to the back base of the bucket, and the tip is connected to the tip of the bucket cylinder and Coaxially connected to the tip of the second link, the base end of the second link is connected to the tip of the arm,
The crane hook is able to freely change its posture between a storage posture that is raised upward and disposed between the pair of left and right first links, and a use posture that is suspended downward and disposed outside the pair of left and right first links.
Proximity switch for detecting the crane hook in the stowed position is provided on either the left or right first link,
The proximity switch is a hydraulic excavator with a crane hook connected to a cable that transmits the detection signal,
The cable is routed along the first link to which the proximity switch is attached, and is connected to the first link through a through hole formed by opening in the left-right direction at the tip of the second link. Extend the cable from the inner side of the link to the outer side, and extend it in the cable cover attached to the outer side of the second link in the longitudinal direction.
The cable wired in the cable cover is configured to swing integrally with the second link that swings around the base end in conjunction with the swinging motion of the bucket.

  According to the first aspect of the present invention, the cable wired in the cable cover that is attached to the outer side surface of the second link in the longitudinal direction is swung around the base end in conjunction with the swinging motion of the bucket. Since it is structured to prevent the aerial routing as much as possible by swinging integrally with the moving second link, inclusions are interposed between the arm and the second link during excavation work. Even in this case, the midway portion of the cable wired in the cable cover is not worn or pressed by the inclusions and is not damaged. Also, the grease coming out of the base end of the second link pivotally supported on the tip of the arm via the pivot sticks to the cable routed in the cable cover, and the cable becomes dirty. Since the covering member of the cable is not altered, the cable routed in the cable cover is not damaged in this case as well. Eventually, by routing the middle part of the cable in the cable cover attached to the outer surface of the second link so as to extend in the longitudinal direction, the exposure of the cable is minimized, and the risk of cable breakage is reduced.

The invention according to claim 2
The cable extension that extends outward from the cable cover allows the flexure deformation operation and the restoration operation to be freely performed in conjunction with the swing movement of the second link, and the cable attached to the side surface of the arm. It is guided and supported through a guide so that it can bend and restore along the side of the tip of the arm.

  In the invention according to claim 2, the extension portion of the cable extending outward from the cable cover is guided and supported via the cable guide attached to the side surface of the arm, and extends along the side surface of the tip portion of the arm. Since the bending deformation operation and the restoring operation are performed, it is possible to avoid the extension portion from being damaged due to interference with other objects.

The invention described in claim 3
The outer peripheral surface of the cable was covered with a rubber hose, and the outer peripheral surface of the rubber hose was covered with a guard spring.

  In the invention according to claim 3, the outer peripheral surface of the cable is covered with a rubber hose, and further, the outer peripheral surface is covered with a guard spring, thereby improving the wear resistance of the cable without impairing the flexibility of the cable. Can do.

The invention according to claim 4
One side of the cable was fixed with the rubber hose and guard spring, while the other side of the cable was fixed with the rubber hose and guard spring.

  In the invention according to claim 4, since the cable and the one side part of the rubber hose and the guard spring as the protection member are fixed and the other side part is not fixed, the expansion ratio of the cable and the protection member due to bending Can absorb the difference. Therefore, the flexibility of the cable can be ensured satisfactorily.

  ADVANTAGE OF THE INVENTION According to this invention, the hydraulic shovel with a crane hook which can prevent that a cable is damaged can be provided.

The left view of the hydraulic shovel with a crane hook which concerns on this embodiment. Expansive left side explanatory drawing of the front-end | tip part of an arm. II sectional view explanatory drawing of FIG. Expansive perspective explanatory drawing of the front-end | tip part of an arm. Expansive front explanatory drawing of the front-end | tip part of an arm. Expansive bottom explanatory drawing of the front-end | tip part of an arm. Explanatory drawing of the storage attitude | position and use attitude | position of a crane hook. The perspective explanatory view of a bucket link mechanism. Explanatory drawing on the left side of the state where the bucket is closest to the arm. Explanatory drawing which shows the state in which the debris etc. were pinched | interposed between the arm and the 1st link on the left side. Explanatory drawing of a protection cable.

  Embodiments of the present invention will be described below with reference to the drawings. A shown in FIG. 1 is a hydraulic excavator with a crane hook according to the present embodiment. The hydraulic excavator A with a crane hook is selectively used for a crane (lifting / lateral movement / hanging) work, excavation work, and earth removal work. It can be done.

[Description of overall structure of hydraulic excavator with crane hook]
As shown in FIG. 1, the hydraulic excavator A with a crane hook includes a crane / excavation working unit 2 and a soil removal working unit 3 in a self-propelled vehicle body 1.

  The vehicle body 1 includes a pair of left and right crawler type traveling units 10, 10, a swivel support unit 11 installed between the travel units 10, 10, and a swivel table 12 that is pivotably mounted on the swivel support unit 11. The cabin-type operation unit 13 and the prime mover unit 14 are mounted on the swivel base 12.

  The crane and excavation working unit 2 is provided with a bracket support 20 at the front end of the swivel base 12. A boom support bracket 21 is attached to the bracket support 20 so as to be able to swing left and right around the vertical axis, and a left and right swing cylinder (not shown) is interposed between the boom support bracket 21 and the swivel base 12. Thus, the boom support bracket 21 can be swung left and right by the left and right rocking cylinder. The boom support bracket 21 is pivotally supported by a boom support shaft 23 having a base end portion (lower end portion) of a boom 22 which is extended in the vertical direction and formed in a “U” shape when viewed from the side, with a boom support shaft 23 oriented in the left-right direction. It is connected. A boom cylinder 24 is interposed between the front end portion of the boom support bracket 21 and the middle portion of the boom 22, and the boom 22 can be moved up and down by the boom cylinder 24. At the distal end (upper end) of the boom 22, a base end (upper end) of an arm 25 formed by extending straight in the vertical direction is pivotally supported via an arm support shaft 26 having an axis line in the horizontal direction. It is connected. An arm cylinder 27 is interposed between the base end of the arm 25 and the middle part of the boom 22 so that the arm 25 can swing back and forth by the arm cylinder 27. The upper end of a pair of left and right bucket brackets 29L and 29R provided on the rear base (front end) of the bucket 28 is connected to the distal end (lower end) of the arm 25 via a bucket support shaft 30 whose axis is directed in the left-right direction. It is pivotally connected. Between the lower portion of the bucket brackets 29L and 29R and the base end of the arm 25, a bucket cylinder 32 is provided via a bucket link mechanism 31 so that the bucket 28 can swing up and down by the bucket cylinder 32.

  As shown in FIGS. 2 and 4 to 6, the bucket link mechanism 31 includes a pair of left and right first links 33L and 33R and a pair of left and right second links 34L and 34R. The first links 33L and 33R are formed in a longitudinal plate shape in the front-rear direction and are arranged facing the left and right sides, and the first base end bosses 33La, While 33Ra is provided, first tip boss portions 33Lb and 33Rb having an axis line in the left-right direction are provided at the tip. The second links 34L and 34R are formed in a longitudinal plate shape in the front-rear direction and are arranged facing the left and right sides, and the second base end bosses 34La, 34a, While 34Ra is provided, second tip boss portions 34Lb and 34Rb having the axis line in the left-right direction are provided at the tip. Further, a tip boss portion 32 a having an axis line in the left-right direction is provided at the tip portion of the bucket cylinder 32.

  The first base end boss portions 33La and 33Ra of the first links 33L and 33R are pivotally connected to the lower portions of the bucket brackets 29L and 29R via a first base pivot 35 having an axis line in the left-right direction. The second base end boss portions 34La and 34Ra of the second links 34L and 34R are pivotally connected to the distal end portion of the arm 25 via a second base pivot shaft 36 having an axis line in the left-right direction. The second tip bosses 34Lb and 34Rb are horizontally inserted with a second tip pivot 37 having an axis line in the left-right direction. The second tip bosses 33Lb and 33Rb are inserted into the second tip boss 37, respectively. The second tip bosses 34Lb and 34Rb are pivotally connected by being positioned inside the second tip bosses 34Lb and 34Rb, and the tip boss 32a is pivotally connected by being positioned inside the first tip bosses 33Lb and 33Rb. That is, the first tip boss portions 33Lb and 33Rb are arranged between the second tip boss portions 34Lb and 34Rb, the tip boss portion 32a is arranged between the first tip boss portions 33Lb and 33Rb, and these boss portions are single. The second tip pivot 37 is pivotally connected in a coaxial manner.

  A crane hook 40 is attached to the bucket link mechanism 31. That is, the crane hook 40 is formed by attaching the hook main piece 43 to the hook boss portion 41 via the swivel 42. The hook boss portion 41 is pivotally fitted to the central portion of the first base pivot 35 and is pivotally connected. The hook boss 41 is disposed between the first base boss portions 33La and 33Ra and is coaxial with the first base pivot 35. Is pivotally connected. Then, as shown in FIG. 7, the crane hook 40 has a storage posture (a) in which the crane hook 40 jumps upward about the first base pivot 35 and is disposed between the pair of left and right first links 33 </ b> L and 33 </ b> R, The posture can be freely changed to a usage posture (b) that is hung down and disposed outside the pair of left and right first links 33L and 33R. Reference numeral 44 denotes a round bar-like locking piece which is horizontally mounted between the upper portions of the first links 33L and 33R, and the hook main piece 43 is detachably locked to the locking piece 44 so that the crane hook 40 is stowed. It is made to hold | maintain to (a).

  As shown in FIGS. 6 and 7, a proximity switch 50 for detecting the crane hook 40 in the storage position (a) is provided on the first link 33L on either one of the left and right sides (in the present embodiment, on the left side). . The proximity switch 50 is a non-contact type sensor, and includes an inductive type, a capacitance type, an ultrasonic type, a photoelectric type, a magnetic type, and the like. A switch insertion hole 45 that opens in the left-right direction is formed in the lower portion of the left first link 33 </ b> L, and the proximity switch 50 is inserted and fixed in the switch insertion hole 45. The fixed proximity switch 50 is arranged so that the right end thereof faces and closes to the swivel 42 of the crane hook 40 in the storage posture. The left end of the proximity switch 50 is connected to the tip of a plurality of electric wires 70a that transmit detection signals, while a controller (not shown) that is a computer device disposed at a predetermined location of the vehicle body 1 includes: Base ends of a plurality of electric wires 70a are connected, and the plurality of electric wires 70a are bundled together to form a cable harness (hereinafter abbreviated as “cable”) 70. In the present embodiment, the protected cable 90 is the tip portion of the cable 70 extending from the proximity switch 50 to the relay portion 53 provided in the middle of the front surface of the arm 25. The protected cable 90 covers and protects the outer peripheral surface of the distal end portion of the cable 70 with a protective member 100 described later, and at a predetermined portion of the outer peripheral surface of the protective member 100, that is, a first fixing piece 96 and a cable cover described later. The fixing member 102 is provided at positions corresponding to the four positions fixed by 80, the second fixing piece 97 and the third fixing piece 98. A switch cover 51 covers the left end of the proximity switch 50 and the tip of the protected cable 90, and the switch cover 51 is attached to the outer surface of the left first link 33L.

  When the proximity switch 50 detects the presence of the swivel 42 of the crane hook 40, the detection information is transmitted to the controller, and the controller that acquired the detection information recognizes the presence of the crane hook 40, that is, the crane hook 40. Is in the stowed posture, and the fact is notified to the operator by a sound signal, an optical signal, or the like.

  As shown in FIG. 1, the earth removal work unit 3 pivotally connects the base end portions of a pair of left and right earth discharge plate support arms 60, 60 to the swivel base support unit 11, so that both the earth discharge plate support arms 60, The tip end side of 60 is made swingable, and between the tip ends of the two earthing plate support arms 60, 60, a longitudinal earthing plate 61 is installed in the left-right direction. It is possible to work. Reference numeral 62 denotes a discharge plate cylinder.

  In the hydraulic excavator A with a crane hook configured as described above, excavation work can be performed by the bucket 28 by setting the crane hook 40 to the storage posture. In addition, the bucket 28 is rotated so that the opening surface is oriented upward, and the crane hook 40 is suspended in the vertical direction (b). Crane work can be carried out by locking the contained earth and sand container bag (not shown) to the crane hook 40. Also, the earth and sand piled up on the ground can be discharged by the earth discharging plate 61, that is, the earth can be removed.

[Description of Characteristic Configuration of this Embodiment]
Next, a characteristic configuration of the present embodiment will be described. That is, the present embodiment is characterized in the wiring structure of the protected cable 90 that is the tip portion of the cable 70 extending from the proximity switch 50 to the relay portion 53 provided in the middle of the front surface of the arm 25. Hereinafter, the characteristic wiring structure of the protected cable 90 will be described in detail with reference to FIGS.

  As shown in FIG. 5, the protected cable 90 includes a first section 91 to a fifth section 95. The first section 91 is a section covered with the switch cover 51 by connecting the tip of the electric wire 70 a to the proximity switch 50. The second section 92 extends outward from the switch cover 51 and is wired behind the first link 33L on the left side to which the switch cover 51 is attached (in this embodiment, the rear end face side) and along the longitudinal direction. This is a classification. The third section 93 is a section that extends from the inner side to the outer side of the second link 34L via the through hole 52 and is wired. The through hole 52 is formed to open in the left-right direction at the tip of the left second link 34L connected to the left first link 33L. The fourth section 94 is a section that extends through the cable cover 80 and is wired and supported. The cable cover 80 is attached to the outer surface of the second link 34L by extending in the longitudinal direction. The fifth section 95 is a section that extends outward from the cable cover 80 and connects the relay connection terminal 54 (see FIG. 11) provided at the proximal end of the electric wire 70 a to the relay portion 53.

  The protected cable 90 is fixed at a total of four locations. The first part is fixed to the left first link 33L in the second section 92 by a first fixing piece 96 attached to the left first link 33L. The second part is fixed to the outer surface of the second link 34L in the fourth section 94 by a cable cover 80 attached to the second link 34L. In the fifth section 95, the third place and the fourth place are provided on the left side of the arm 25 along the cable guide 99 described later by the second fixed piece 97 and the third fixed piece 98 attached to the left outer surface of the arm 25. It is fixed to the outside surface.

  As shown in FIGS. 4 to 7, a part (tip portion) of the protected cable 90 wired to the first section 91 is covered with the switch cover 51 on the outer surface of the first link 33 </ b> L on the left side, The tip, that is, the tip of the electric wire 70a is connected to the proximity switch 50 attached to the left first link 33L.

  As shown in FIGS. 8 to 10, a part of the protected cable 90 wired to the second section 92 extends along the upper end surface of the left first link 33 </ b> L and has an L-shaped cross section. The formed cable guide / protection piece 86 is projected and wired in a state where the protected cable 90 is constrained between the cable guide / protection piece 86 and the rear end surface of the left first link 33L. Yes. By doing so, as shown in FIG. 10, even when the debris or the like D is sandwiched between the cable guide / protection piece 86 and the arm 25, the protected cable 90 wired to the second section 92 is It is protected by the cum protection piece 86 and is not damaged. The protected cable 90 wired in the second section 92 is wired in a state where the protected cable 90 is sandwiched between the cable guide / protective piece 86 and the rear end surface of the left first link 33L. Therefore, interference with the plated portion of the piston rod of the bucket cylinder 32 can be prevented.

  As shown in FIG. 4, a part of the protected cable 90 wired in the third section 93 penetrates the second link 34L through the through hole 52 in a transverse state, and the through hole 52 is connected to the second link 34L. It is formed in a long hole along the longitudinal direction. The protected cable 90 wired in the third section 93 can finely move in the longitudinal direction of the second link 34L in the through hole 52, and follows the operation of the left first and second links 33L, 34L without difficulty. Like to do.

  A part of the protected cable 90 wired in the fourth section 94 is covered with the outer surface of the second link 34L and the cable cover 80 attached to the outer surface as shown in FIGS. Has been. The cable cover 80 includes a support plate 81 formed as long as possible between the second base boss 34La and the second tip boss 34Lb of the left second link 34L, and the support plate 81 and the longitudinal The cover body 82 is formed of the same width, and the lower end edge portion 82 a is connected to the outer surface of the support plate 81 by a bolt 83 in a superposed state. The cover body 82 is formed by extending a lower end edge 82a, a rising wall 82b formed by extending straight upward from the lower end edge 82a, and extending from the upper end edge of the rising wall 82b to the second link 34L side. And the canopy wall 82c. The protected cable 90 of the fourth section 94 is wired and fixed in a cylindrical space formed by the cover body 82, the support plate 81, and the left second link 34L. Reference numeral 88 denotes an anti-slip rubber plate affixed to the upper part of the inner surface of the rising wall 82b, and the rubber plate 88 is interposed between the rising wall 82b and the guard spring 106 of the protected cable 90, thereby raising the rising wall. The guard spring 106 is prevented from sliding against the inner surface of 82b.

  Here, the front portion of the cover body 82 covers the through hole 52 from the outside, and the protected cable 90 drawn through the through hole 52 is introduced into the cover body 82. Further, a notch portion 84 is formed at the rear end portion of the canopy wall 82 c so that the cable 70 can be drawn forward from the cover body 82 through the notch portion 84. The notch 84 is provided with a “U” -shaped cable restricting piece 85 projecting from the outer surface of the left second link 34L, and the cable restricting piece projecting from the outer surface of the second link 34L. No. 85 is opened in the front-rear direction, and the starting end portion of the protected cable 90 of the fifth section 95 inserted through the cable restricting piece 85 is restricted so as to be firmly separated from the second base end boss portion 34La. . By doing so, the protected cable 90 is prevented from being in contact with the second base end boss portion 34La and worn, and the grease flowing out from the second base end boss portion 34La is prevented from adhering to the protected cable 90. doing.

  The protected cable 90 of the fourth section 94 configured as described above is oscillated around the second base pivot 36 that pivotally supports the second base boss 34La by being wired in the cable cover 80. The two links 34L are swung integrally. At this time, the second link 34L swings in conjunction with the swinging motion of the bucket 28.

  More specifically, the protected cable 90 wired in the cable cover 80 extended in the longitudinal direction and attached to the outer surface of the second link 34L on the left side is interlocked with the swinging motion of the bucket 28. A structure that prevents the aerial routing as much as possible by swinging integrally with the second link 34L swinging about the second base pivot 36 that pivotally supports the second base end boss 34La. Therefore, even when another object is interposed between the arm 25 and the second link 34L during excavation work, the middle portion of the protected cable 90 wired in the cable cover 80 is worn and pinched by the inclusion. Will not be damaged. Further, the protected cable in which the grease flowing out from the second base end boss portion 34La of the second link 34L pivotally supported on the tip end portion of the arm 25 via the second base portion pivot shaft 36 is wired in the cable cover 80. 90, the protected cable 90 becomes dirty, and further, the protective member 100 of the protected cable 90 is not deteriorated by grease. In this case as well, the protected cable wired in the cable cover 80 is used. 90 is not damaged. Eventually, by routing the middle portion of the protected cable 90 in the cable cover 80 that is attached to the outer surface of the second link 34L in the longitudinal direction, exposure of the protected cable 90 is minimized, The risk of breakage of the protective cable 90 is reduced.

  A part of the protected cable 90 wired to the fifth section 95 extends outward from the cable cover 80 and is provided on the arm 25 as shown in FIGS. 2, 4, 5, and 9. 53 is an extension portion of the protected cable 90 connected to 53, and this extension portion freely allows a downward bending deformation operation and an upward restoration operation in conjunction with the swing operation of the second link 34L. At the same time, it is guided and supported via a cable guide 99 attached to the side surface of the arm 25 so that the bending deformation operation and the restoring operation are performed along the side surface of the tip portion of the arm 25.

  In the fifth section 95 configured as described above, the extension portion of the protected cable 90 extending outward from the cable cover 80 is guided and supported via the cable guide 99 attached to the side surface of the arm 25. Since the bending deformation operation and the restoring operation are performed along the side surface of the distal end portion of the arm 25, it is possible to avoid the extension portion from being damaged due to interference with other objects.

  The cable guide 99 is formed of a guide support 99a and a guide main body 99b. The guide support body 99a has a base end portion fixed to the middle portion of the front surface of the arm 25 by a guide fixing body 87, and the distal end portion extends toward the distal end side of the arm 25. Accordingly, the second link 34L on the left side is extended toward the second base end boss portion 34La. A guide body 99b formed in a vertically long ring shape in the vertical direction is integrally formed at the distal end portion of the guide support body 99a, and the distal end portion of the guide body 99b is disposed in the vicinity of the second base end boss portion 34La. . A midway portion of the protected cable 90 wired to the fifth section 95 is inserted into the guide main body 99b. The base end portion of the protected cable 90 wired to the fifth section 95 is fixed to the arm 25 along the guide support 99a by the second fixed piece 97 and the third fixed piece 98 attached to the left outer surface of the arm 25. It is fixed to the left outer surface. With such a configuration, the distal end portion of the protected cable 90 wired in the fifth section 95 performs the bending deformation operation and the restoring operation while being guided by the guide main body 99b.

  Next, the configuration of the protected cable 90 will be described. As shown in FIG. 11, the outer peripheral surface of the cable 70 is covered with a protective member 100 in the protected cable 90, and the protective member 100 has a rubber hose 104 and a guard spring 106 laminated concentrically. The distal end side of the protected cable 90 connected to the proximity switch 50 firmly fixes the protective member 100 to the cable 70, while the proximal end of the protected cable 90 connected to the relay portion 53 via the relay connection terminal 54. The side prevents the protective member 100 from being fixed to the cable 70.

  That is, the outer peripheral surface on the distal end side of the cable 70 is covered with the rubber hose 104 except for the distal end portion, and the outer peripheral surface of the rubber hose 104 is covered with the guard spring 106. A predetermined portion of the outer peripheral surface of the guard spring 106 is partially covered with a fixing rubber as the fixing member 102. The front end portion of the cable 70 is exposed without being covered with the rubber hose 104, and a first positioning vinyl tape 108 is wound around the exposed portion to position the front end of the rubber hose 104. The tip of the rubber hose 104 is exposed without being covered with the guard spring 106, and the second positioning vinyl tape 110 is wound around the exposed portion to position the tip of the guard spring 106. The outer surface of the connecting portion between the distal end portion of the cable 70, the first positioning vinyl tape 108, and the rubber hose 104 is covered with a heat shrinkable tube 112. The outer surface of the connecting portion between the second positioning vinyl tape 110 and the guard spring 106 is also covered with the heat shrinkable tube 112. A vinyl tape 114 is wound around the surfaces of the guard spring 106 and the fixing member 102.

  Further, the outer peripheral surface on the proximal end side of the cable 70 is covered with the rubber hose 104 similarly to the distal end side, and the outer peripheral surface of the rubber hose 104 is covered with the guard spring 106. The base end portion of the cable 70 is exposed without being covered with the rubber hose 104, and a corrugated tube 116 is externally fitted to the exposed portion for protection. The outer surface of the connecting portion between the rubber hose 104 and the corrugated tube 116 is covered with a heat shrinkable tube 112. The base end portion of the cable 70, the rubber hose 104, and the guard spring 106 are not fixed.

  In the protected cable 90 configured in this way, the outer peripheral surface of the cable 70 is covered with the rubber hose 104, and further, the outer peripheral surface is covered with the guard spring 106, so that the flexibility of the protected cable 90 is not impaired. The wear resistance of the protected cable 90 can be improved. Further, the cable 70 and the rubber hose 104 and the guard spring 106 which are the protection member 100 are fixed at the distal ends, and the base end is not fixed, so that the expansion ratio of the cable 70 and the protection member 100 due to bending is increased. Can absorb the difference. Therefore, the flexibility of the protected cable 90 can be ensured satisfactorily.

A Hydraulic excavator with crane hook 1 Car body 2 Crane and excavation working part,
3 Deburring section 31 Bucket link mechanism 50 Proximity switch 70 Cable 80 Cable cover

Claims (4)

It is equipped with a working section that enables selective crane work and excavation work,
The working unit includes an arm, a bucket attached to the tip of the arm, a bucket cylinder that swings the bucket, a bucket link mechanism interposed between the bucket cylinder, the bucket, and the arm, and a bucket link mechanism. An attached crane hook, and
The bucket link mechanism includes a pair of left and right first links and a pair of left and right second links. The first link connects the base end to the back base of the bucket, and the tip is connected to the tip of the bucket cylinder and Coaxially connected to the tip of the second link, the base end of the second link is connected to the tip of the arm,
The crane hook is able to freely change its posture between a storage posture that is raised upward and disposed between the pair of left and right first links, and a use posture that is suspended downward and disposed outside the pair of left and right first links.
Proximity switch for detecting the crane hook in the stowed position is provided on either the left or right first link,
The proximity switch is a hydraulic excavator with a crane hook connected to a cable that transmits the detection signal,
The cable is routed along the first link to which the proximity switch is attached, and is connected to the first link through a through hole formed by opening in the left-right direction at the tip of the second link. Extend the cable from the inner side of the link to the outer side, and extend it in the cable cover attached to the outer side of the second link in the longitudinal direction.
The cable routed in the cable cover is a hydraulic excavator with a crane hook that swings integrally with a second link that swings around the base end in conjunction with the swinging motion of the bucket.   The cable extension that extends outward from the cable cover allows the flexure deformation operation and the restoration operation to be freely performed in conjunction with the swing movement of the second link, and the cable attached to the side surface of the arm. The hydraulic excavator with a crane hook according to claim 1, wherein the excavator is guided and supported through a guide so that a bending deformation operation and a restoring operation are performed along a side surface of a tip portion of the arm.   The hydraulic excavator with a crane hook according to claim 1 or 2, wherein the outer peripheral surface of the cable is covered with a rubber hose, and the outer peripheral surface of the rubber hose is covered with a guard spring.   The hydraulic excavator with a crane hook according to claim 3, wherein one side portion of the cable is fixed to the rubber hose and the guard spring while the other side portion of the cable is not fixed to the rubber hose and the guard spring.

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