JP6527091B2 - Post drive - Google Patents

Description

  The present invention relates to a post drive device.

  The crane is provided with a rear post support member (e.g., a cable) that supports the rear post during crane operation (loading operation). Patent Document 1 describes a method of assembling a rear post support cable in which a hydraulic cylinder is interposed between a rear post of a crane and a boom to make the rear post pivotable, and the two divided rear post support cables are connected and constructed. It is done.

  In the method described in Patent Document 1, the rear post and the front post are attached to the boom head of the tower boom that has been turned horizontally. One end of one rear post support cable is locked to the front end of the rear post, and one end of the other rear post support cable is locked to the cable attachment of the tower boom. The other rear post support cable is laid on the tower boom and the other end is disposed on the rear post side.

  When the hydraulic cylinder is contracted, the rear post is turned to the tower boom side, and the two rear post supporting cables are connected. Thereafter, the hydraulic cylinder is extended, and the rear post is erected at a predetermined angle, and the rear post supporting cable is erected.

JP-A-8-48489

  In the method described in Patent Document 1, it is necessary to lift the rear post attached to the horizontally laid down boom almost vertically using an auxiliary crane (see paragraph [0010] of Patent Document 1 and FIG. 4).

  A post drive device according to one aspect of the present invention is rotatably attached at a distal end side of a boom, a jib attached to the boom in an inclinable manner, and a distal end of the boom, and is connected to the jib via a pendant member. A rear post which is rotatably attached at the front end of the boom and at the tip end of the boom and on which a jib relief rope is wound and wound between the front post and a post side having one end attached to the tip of the rear post A post drive device for a crane comprising a pendant member, and a boom side pendant member having one end attached to the other end of the post side pendant member and the other end attached to the boom, wherein the one end portion is A connecting portion rotatably attached to the boom and provided on the boom at the other end (hereinafter referred to as a boom side connecting portion) And a link mechanism provided with a coupling portion (hereinafter referred to as a link side coupling portion) detachably coupled to the link, and an extension and contraction having one end connected to the rear post and the other end connected to the other end of the link mechanism An actuator, the link mechanism being disposed in a first position in which the boom is laid horizontally and the rear post is inclined toward the front post with reference to a vertical axis; When the extension actuator is extended when the link-side joint and the boom-side joint are separated, the boom can be positioned to a position where the link-side joint and the boom-side joint can be coupled. When the telescopic actuator is contracted when the link side coupling portion and the boom side coupling portion are coupled to each other, the boom is removed from the boom. The rear post is pivoted to the boom side to a second position where the one end of the boom side pendant member and the other end of the post side pendant member attached to the tip of the rear post can be attached It is supposed to be configured.

  According to the present invention, since the rear post attached to the horizontally laid down boom and inclined to the front post can be erected without using the auxiliary crane and can be inclined to the boom side, the post side pendant member and the boom The attachment workability of the side pendant member can be improved.

The side view which shows the external appearance of a tower crane. The perspective view which shows the front-end | tip part of a boom. The side view which shows the front-end | tip part of a boom. The top view of a link mechanism. FIG. 5 is a cross-sectional view taken along line V-V of FIG. 4; The figure explaining the rotation restriction mechanism which controls rotation of the 1st link. The schematic diagram which shows the rotation range of the rear post rotated by a post drive device. The figure which shows the state in which the front post and the rear post were attached to the boom. The figure explaining a mode that a 1st link is rotationally driven by cylinder thrust. (A) is a figure explaining that a 1st link is rotationally driven by a cylinder thrust, (b) shows the state in which the eccentric cam of a rotation restriction mechanism and the follower link are contacting. Xb part enlarged view. (A) is a figure explaining that a 1st link is rotationally driven by a cylinder thrust, (b) shows the state in which the eccentric cam of a rotation restriction mechanism and the follower link are contacting. The XIb part enlarged view. (A) is a diagram for explaining how the first link is rotationally driven by its own weight, (b) is a diagram showing that the eccentric cam of the rotation limiting mechanism and the follower link are in contact with each other Part enlarged view. (A) is a diagram for explaining how the first link is rotationally driven by its own weight, (b) shows a state where the eccentric cam of the rotation limiting mechanism and the follower link are in contact with each other Part enlarged view. (A) illustrates how the first link is rotationally driven by its own weight, and (b) illustrates a state where the eccentric cam of the rotation limiting mechanism and the follower link are not in contact. . The figure explaining a mode that a rear post is rotationally driven by a post drive device. The figure explaining a mode that a rear post is rotationally driven by a post drive device. The figure explaining a mode that a rear post is rotationally driven by a post drive device. The figure explaining the operation | work which attaches a post side pendant member and the boom side pendant member. The figure explaining the operation | work which extends a post side pendant member and a boom side pendant member.

  A crane according to the present invention will be described with reference to the drawings. In addition, for convenience of explanation, as described in each drawing, front, rear, left, right and up and down directions of the crane are defined. FIG. 1 is a side view showing the appearance of a tower crane. The tower crane (hereinafter referred to as the crane 100) includes a traveling body 101, a revolving unit 102 mounted so as to be able to turn on the traveling unit 101, and a tower boom (hereinafter referred to as It has a boom 103) and a tower jib (hereinafter referred to as a jib 104) attached to the tip of the boom 103 so as to be able to move up and down. A main hook 105 and a complementary hook 106 are suspended at the tip of the jib 104.

  A boom undulation winch (not shown) is mounted on the revolving unit 102, and a main winding winch 111, a supplementary winding winch 110, and a jib undulation winch 113 are mounted on the boom 103. A main winding wire rope (hereinafter referred to as a main winding rope 111a) is wound around the main winding winch 111, and the main winding rope 111a is connected to the main hook 105 via the top of the boom 103 and the top of the jib 104. ing. The main winding rope 111a is wound or unwound by the drive of the main winding winch 111, and the main hook 105 is moved up and down.

  A wire rope for supplementary winding (hereinafter referred to as supplementary winding rope 110a) is wound around the supplementary winding winch 110, and the supplementary winding rope 110a is connected to the supplementary hook 106 via the top of the boom 103 and the top of the jib 104. ing. By driving the auxiliary winding winch 110, the auxiliary winding rope 110a is wound or unwound, and the auxiliary hook 106 is moved up and down.

  A mast 107 is pivotally supported at the front of the swing body 102, and the tip of the mast 107 and the top of the boom 103 are connected by a pendant member 115. A wire rope for relief (hereinafter referred to as a boom relief rope 112a) is wound around the boom relief winch (not shown). The boom undulation rope 112a is wound around a plurality of times between a sheave 121 provided at the rear of a boom undulation winch (not shown) and a sheave 122 provided at the tip of the mast 107. The boom undulation rope 112a is wound up or unwound by the drive of the boom undulation winch (not shown), the mast 107 is rotated, and the boom 103 is undulated via the pendant member 115.

  A jib relief rope 113a is wound around the jib relief winch 113. A front post 108 and a rear post 109 are rotatably attached to the tip of the boom 103. The front post 108 is disposed between the jib 104 and the rear post 109, and is connected to the tip of the jib 104 via a pendant member 116.

  A sheave 123 is provided at the tip of the front post 108, and a sheave 124 is provided at the tip of the rear post 109. Between the sheave 123 of the front post 108 and the sheave 124 of the rear post 109, a jib relief rope 113a for jib relief is wound around a plurality of times. When the jib relief rope 113a is wound or unwound by the drive of the jib relief winch 113, the front post 108 rotates with respect to the rear post 109, and the jib 104 is relief via the pendant member 116.

  The distal end of the rear post 109 and the bracket 139 near the base end of the boom 103 are connected by a rear post support pendant 140 which can be split. The rear post support pendant 140 can be divided into a post side pendant member 141 and a boom side pendant member 142.

  One end of the post-side pendant member 141 is rotatably attached to the shaft 109 b at the tip of the rear post 109. The shaft 109 b supports the sheave 124 at the center and supports the post-side pendant member 141 at both ends. One end of the boom side pendant member 142 is attached to the other end of the post side pendant member 141. The other end of the boom side pendant member 142 is rotatably attached to a bracket 139 near the proximal end of the boom 103.

  The rear post support pendant 140 is formed by connecting constituent members such as a plurality of rod-like pendant members (bar pendants) and pendant members (pendant ropes) formed of a wire rope. In the present embodiment, the post-side pendant member 141 is a single bar-like bar pendant. The boom side pendant member 142 is formed by connecting a plurality of bar-shaped bar pendants. The post side pendant member 141 and the boom side pendant member 142 are connected via the connection fitting 143.

  The crane 100 is usually transported individually to the work site by the trailer in a state where the boom 103, the jib 104 and the like are disassembled, and assembled at the work site. At the time of assembly work, the operator attaches the front post 108 and the rear post 109 to the tip end side of the boom 103 in an laid-down state in which the boom 103 is extended to be substantially horizontal to the ground.

  After attaching the front post 108 and the rear post 109 to the boom 103, the operator connects the post-side pendant member 141 connected to the rear post 109 and the boom-side pendant member 142 connected to the boom 103. Thereafter, the worker attaches the jib 104 to the boom using an auxiliary crane or the like.

  Hereinafter, the configuration of the post drive device 150 used to attach the post side pendant member 141 and the boom side pendant member 142 will be described in detail. The post drive device 150 is provided at the tip of the boom 103.

  2 is a perspective view showing the tip of the boom 103, and FIG. 3 is a side view showing the tip of the boom 103. As shown in FIG. As shown in FIGS. 2 and 3, the boom 103 is provided with a boom head 131 which constitutes a tip end portion of the boom 103. FIGS. 2 and 3 show the collapsed state in which the abdominal surface of the boom 103 is laid down to face the ground G (see FIG. 2) and the boom 103 is disposed substantially horizontally so as to extend in the front-rear direction. . In FIG. 2 and FIG. 3, the front post 108 is omitted, so the front post 108 will be described with reference to FIG.

  As shown in FIGS. 2 and 3, on the top (the right end in FIG. 3) of the boom head 131, a pair of left and right post fixing members 132 having a predetermined length are provided. The pair of left and right post fixing members 132 are connected by two support pipes 166 and 167 at both end portions in the longitudinal direction (vertical direction).

  As shown in FIG. 8, the front post 108 is a connecting member (not shown) that connects a pair of support columns 181 arranged to extend in parallel to each other in the longitudinal direction and a pair of left and right support columns 181 arranged opposite to each other in the left-right direction. And). A pair of left and right support columns 181 constituting the front post 108 is pivotally supported by one end of the post fixing member 132 (the lower end of the post fixing member 132 shown in FIG. 8) by a pin 108a extending in the left and right direction. .

  As shown in FIGS. 2 and 3, the rear post 109 is configured to connect a pair of left and right columns 191 disposed to extend in the longitudinal direction in parallel to one another and a plurality of left and right columns 191 disposed opposite to each other in the left and right direction. And a connecting member 192 (see FIG. 2). The support 191 is pivotally supported by the other end of the post fixing member 132 (the upper end of the post fixing member 132 shown in FIG. 3) by a pin 109a extending in the left-right direction. The pin 109 a is fixed to the post fixing member 132 at each of upper end portions of the pair of left and right post fixing members 132.

  Between the rear post 109 and the boom head 131, a post driving device 150 for driving the rear post 109 to rotate is provided. The post drive device 150 includes a pair of left and right link mechanisms 155 and a pair of hydraulic cylinders 153 for driving the link mechanisms 155.

  The pair of left and right link mechanisms 155 have the same configuration, and therefore, one link mechanism 155 will be described as a representative. The link mechanism 155 includes a first link 151, a second link 152, and a connection link 154.

  The proximal end of the first link 151 and the proximal end of the second link 152 are rotatably attached to the pin 109a. That is, as described above, the pin 109 a is not only a pivot of the rear post 109 but also a pivot of the first link 151 and the second link 152. That is, the first link 151, the second link, and the rear post 109 are coaxially rotatably attached to the boom head 131.

  4 is a plan view of the link mechanism 155, and FIG. 5 is a cross-sectional view taken along the line V-V of FIG. As shown in FIGS. 2, 4 and 5, the first link 151 has a structure in which a pair of left and right elongated vertical plates 151a are joined by a horizontal plate 151b (see FIG. 5). The second link 152 has a structure in which a pair of left and right long vertical plates 152a are joined by a horizontal plate 152b (see FIG. 5). The connection link 154 has a structure in which a pair of left and right long vertical plates 154a are joined by a horizontal plate 154b (see FIG. 5).

  A pin 161, which is a cylindrical shaft, is suspended at the tip of the pair of vertical plates 151a constituting the first link 151 so as to extend in the left-right direction. A connecting pin 162, which is a cylindrical shaft, is suspended at the tip of the pair of vertical plates 152a constituting the second link 152 so as to extend in the left-right direction.

  The connection link 154 is a link member that regulates the relative angle between the first link 151 and the second link 152 by the sliding opening 154 h. As shown in FIG. 5, the connection link 154 is provided with a through hole 154c at the lower end portion through which the pin 161 is inserted, and a sliding opening 154h through which the connection pin 162 is inserted from the center portion to the upper end portion. It is done. The connection link 154 is rotatably attached to the first link 151 with the pin 161 as a pivot. The sliding opening 154h has a racing track shape in which arcs of the same radius are connected to both ends of two parallel straight lines, and the connecting pin 162 can be slidably moved in the longitudinal direction of the connecting link 154. ing. For convenience of description, the lower end of the sliding opening 154 h is referred to as an inner end 154 i, and the upper end of the sliding opening 154 h is referred to as an outer end 154 o.

  As shown in FIG. 2, the hydraulic cylinder 153 has a cylinder tube (hereinafter referred to as a tube 153 t) and a rod 153 r that can extend and contract with respect to the tube 153 t. Inside the tube 153t of the hydraulic cylinder 153, an oil chamber on the bottom side (hereinafter referred to as a bottom chamber) and an oil chamber on the rod side (hereinafter referred to as a rod chamber) are defined. The hydraulic cylinder 153 is configured to extend when the hydraulic fluid is supplied to the bottom chamber, and to contract when the hydraulic fluid is supplied to the rod chamber.

  The tip of the rod 153r of the hydraulic cylinder 153 (hereinafter also referred to as a rod head), the tip of the second link 152, and the upper end of the connection link 154 are connected by the connection pin 162 described above. That is, the hydraulic cylinder 153, the second link 152, and the connection link 154 are connected so as to be relatively rotatable around the connection pin 162 as a rotation center. The tip end portion (connection pin 162) of the hydraulic cylinder 153 is attached to the second link 152, so the locus of the tip end portion (connection pin 162) of the hydraulic cylinder 153 is an arc centered on the pin 109a. That is, the second link 152 is a link member that restricts the trajectory of the rod head of the hydraulic cylinder 153 to a circular arc.

  As shown in FIG. 2, a cylinder support bracket 169 is provided at a position closer to the tip end than the longitudinal central portion of the rear post 109 and on the rear surface side (upper surface side in the drawing) of the support post 191 of the rear post 109. A pin 163 extending in the left-right direction is fixed to the cylinder support bracket 169. The ends of the tubes 153t of the pair of hydraulic cylinders 153 are rotatably attached to the pair of cylinder support brackets 169, with the pin 163 as a pivot.

  As shown in FIG. 4, the hydraulic cylinder 153 is viewed from above when the boom 103 is laid horizontally and the rear post 109 is disposed at a position inclined toward the front post with reference to the vertical axis. When it is placed, it is arranged to overlap the support 191. In other words, as shown in FIG. 4, when viewed from above, the central axis of the hydraulic cylinder 153 is disposed inside the left and right side surfaces of the support 191. That is, the hydraulic cylinder 153 is disposed directly above the support 191 so as to be parallel to the support 191.

  As shown in FIG. 2, a pin support bracket 135 is provided at the base end portion on the back surface side (upper surface side in the drawing) of the boom head 131. The pin support bracket 135 is provided with a pin 168 which is a shaft so as to extend in the left-right direction. The pin 168 is provided on the extension of the rear post 109 in a plan view so as to be orthogonal to the extension.

  As shown in FIG. 5, the tip of the first link 151 is provided with a cylinder receiving recess 171 that contacts the connecting pin 162. The cylinder receiving recess 171 is formed as a U-shaped recess in which the connection pin 162 side (upper side in the drawing) is opened. A positioning recess 172 that contacts the pin 168 is provided at the tip of the first link 151. The positioning recess 172 is formed as a U-shaped recess in which the pin 168 side (lower side in the drawing) is opened.

  The first link 151 is removably coupled to the boom 103 as described below. A through hole 170 through which the fixing pin 160 is inserted is provided at a tip end portion of the first link 151 as a link side coupling portion coupled to the boom 103. As shown in FIG. 2, the fixing pin 160 is a locking pin in a state of being inserted through the through hole of the pin support bracket 135 as the boom side coupling portion and the through hole 170 of the first link 151 as the link side coupling portion. It is fixed to the pin support bracket 135 by a (cone pin) or the like. The state in which the first link 151 is fixed to the pin support bracket 135 of the boom head 131 by the fixing pin 160 and the boom 103 and the tip of the first link 151 are connected is referred to as a connected state. When the distal end of the first link 151 and the boom 103 are separated, the locking pin is removed from the fixing pin 160, and the fixing pin 160 is removed from the through hole of the pin support bracket 135 and the through hole 170 of the first link 151. Just do it. A state in which the first link 151 is not fixed to the pin support bracket 135 of the boom head 131 by the fixing pin 160 and the boom head 131 and the tip of the first link 151 are separated is called a separated state.

  FIG. 6 is a view for explaining a rotation restricting mechanism 180 which restricts the rotation of the first link 151. As shown in FIG. 6 (a) is a side view showing the link mechanism 155, and FIG. 6 (b) is an enlarged view showing a VIb portion of FIG. 6 (a). As shown in FIG. 6A, the rotation limiting mechanism 180 has an eccentric cam 181 and a follower link 182. In FIG. 6, the front post 108 is not shown.

  As shown in FIG. 6B, the eccentric cam 181 is fixed to a pin (rotation support shaft) 109a which is a rotation support point of the rear post 109, the first link 151 and the second link 152. The eccentric cam 181 has an egg shape in which a small radius arc 181 a and a large radius arc 181 b are connected by two straight lines. The follower link 182 has a rounded polygonal shape and is rotatably attached to the second link 152 by a pin 183.

  A contact area C in which the second link 152 contacts the follower link 182 in a predetermined angular range is formed in an arc 181 a of the eccentric cam 181. The eccentric cam 181 is in contact with the follower link 182 in the contact area C, corresponds to the cam curve of the eccentric cam 181, and rotates the follower link 182 about the pin 183 to rotate the link mechanism 155 by its own weight. It has a function to limit the movement angle.

  The pin 165 shown in FIG. 6B is a connecting member that connects the pair of left and right vertical plates 151 a that constitute the first link 151. The follower link 182 is provided with an opening 182 d. The opening 182 d has a racing track shape in which arcs of the same radius are connected to both ends of two parallel straight lines, and are formed so as not to prevent the movement of the pin 165.

  A link mechanism 155 configured by the first link 151, the second link 152, and the connection link 154 connecting the first link 151 and the second link 152 is configured to interlock with the expansion and contraction operation of the hydraulic cylinder 153. . Hereinafter, the operation of the post drive device 150 will be described in detail.

  FIG. 7 is a schematic view showing a pivot range of the rear post 109 pivoted by the post drive device 150. As shown in FIG. In addition, in the side surface schematic diagrams shown in FIG. 7 and FIG. 8, FIG. 18 and FIG. The link mechanism 155 has a range including a first position (PL) shown by a solid line in FIG. 7 and a second position (BL) shown by a two-dot chain line in FIG. 7 in a state where the boom 103 is laid horizontally. The rear post 109 is rotated. That is, the first position (PL) is the front post side limit position of the rotation range S of the rear post 109, and the second position (BL) corresponds to the boom side limit position of the rotation range S of the rear post 109.

  The first position (PL) is a position where the rear post 109 is inclined toward the front post 108 with respect to the vertical axis (V) with reference to the vertical axis (V). Furthermore, in the present embodiment, the first position (PL) is a position where the rear post 109 is inclined toward the front post 108 relative to the position where the rear post 109 is disposed parallel to the boom 103, that is, the horizontal axis (H). More specifically, the rear post 109 is inclined to the front post 108 side. The second position (BL) is a position where the rear post 109 is inclined to the boom 103 side than the position where the rear post 109 is disposed orthogonal to the boom 103, that is, the rear post 109 to the boom 103 side than the vertical axis (V). It is the position which was inclined to

  When the jib relief rope 113a is put on and operated between the sheave 123 and the sheave 124, the sheave 124 of the rear post 109 and the sheave 123 of the front post 108 are made as close as possible and the sheave 124 of the rear post 109 is brought close to the ground G Is preferred from the viewpoint of workability. For this reason, the first position (PL) is set at a position where the rear post 109 is inclined about 5 to 15 degrees toward the front post 108 with respect to the horizontal axis (H). As shown by the solid line, the rear post 109 retracts the hydraulic cylinder 153 most when the boom 103 is laid horizontally and the distal end of the first link 151 is not coupled to the boom head 131. When it is turned on, it is located at the first position (PL).

  The second position (BL), which is the boom side limit position of the rotation range S of the rear post 109, is one end of the boom side pendant member 142 attached to the boom 103 and the post side pendant attached to the tip of the rear post 109 It is a position where the other end of the member 141 can be attached. As shown by a two-dot chain line, the rear post 109 is in a state in which the boom 103 is laid horizontally and in a coupled state in which the tip of the first link 151 is coupled to the boom head 131. When it is contracted the most, it is located at the second position (BL). In the present embodiment, the second position (BL) is set at a position where the rear post 109 is inclined about 35 to 45 degrees toward the boom 103 with respect to the vertical axis (V).

  Thus, the rear post 109 is rotated by the post drive device 150 so as to straddle the vertical axis (V) in a state where the boom 103 is laid horizontally. In the present embodiment, the rotation range S is set to about 130 to 150 degrees so as to include at least the horizontal axis (H) and the vertical axis (V). As a result, the first position (PL) where the jib relief rope 113a can be hooked and wound between the sheave 123 and the sheave 124, and the boom side pendant member 142 and the post side pendant member 141 can be attached. The rear post 109 can be pivoted between the second position (BL).

  Hereinafter, among the assembling operations of the crane 100, an operation of attaching the front post 108 and the rear post 109 to the boom 103 and an operation of attaching the post-side pendant member 141 and the boom-side pendant member 142 will be described. As shown in FIG. 8, the boom side pendant member 142 is placed on the boom 103, and the connection fitting 143 previously connected to the connection end 142a of the boom side pendant member 142 is disposed on the rear post 109 side. ing.

  FIG. 8 is a view showing the boom 103 with the front post 108 and the rear post 109 attached thereto. The operator operates a boom undulation control lever to drive a boom undulation winch (not shown) to lay down the boom 103 so that the boom 103 is horizontal.

  The operator lifts the front post 108 using an auxiliary crane, and attaches the proximal end of the front post 108 to the post fixing member 132 of the boom head 131. Thereafter, the operator lifts the rear post 109 using the auxiliary crane. Note that the hydraulic cylinder 153 is contracted in advance until it reaches the full contraction length. In addition, the post-side pendant member 141 is rotatably attached to a bracket 109c, one end of which is fixed to the shaft 109b at the end of the rear post 109 in advance, so that the other end does not rotate with the other end. The end is fixed to the rear post 109 by a fixing device 109d.

  The operator lifts the rear post 109 using an auxiliary crane, and then attaches the proximal end of the rear post 109 to the post fixing member 132 of the boom head 131. Thereafter, the operator sets the mounting angle of the rear post 109 to an angle at which the rear post 109 is supported by the post drive device 150.

  The operator sets the mounting angle of the rear post 109 so that the rear post 109 is located at the first position (PL), and then removes the rope suspended from the hook of the auxiliary crane. At this time, the distance between the sheave 123 of the front post 108 and the sheave 124 of the rear post 109 and the distance between the sheave 124 and the ground G are shorter than when the rear post 109 is disposed horizontally (see FIG. 3) ing.

  The operator pulls the jib relief rope 113a from the jib relief winch 113 using a weaving winch or the like (not shown). The operator guides the jib relief rope 113 a pulled out of the jib relief winch 113 to the sheave 124 via a guide sheave 134 provided on the rear post 109. Thereafter, the operator turns the jib relief rope 113a between the sheave 124 and the sheave 123 a plurality of times to fix the end of the jib relief rope 113a at a predetermined position on the front post 108.

  FIGS. 9 to 14 and 6 are diagrams for explaining how the link mechanism 155 of the post drive device 150 is rotationally driven with the extension of the hydraulic cylinder 153. The front post 108 is omitted in FIGS. 9 to 14 and 6. Prior to driving the hydraulic cylinder 153, the hydraulic cylinder 153 and a hydraulic source (not shown) are connected. A switching valve unit (not shown) for switching the flow of hydraulic fluid discharged from the hydraulic pressure source is provided between the hydraulic cylinder 153 and the hydraulic pressure source (not shown). The operator can supply the hydraulic fluid discharged from the hydraulic pressure source to either the rod chamber or the bottom chamber of the hydraulic cylinder 153 by operating the switching valve unit (not shown).

  FIG. 9 is a diagram for explaining how the first link 151 is rotationally driven by the cylinder thrust. FIG. 9A shows a separated initial state in which the hydraulic cylinder 153 is contracted to the full reduction length in the separated state in which the tip end portion of the first link 151 and the boom head 131 are separated. In the separation initial state, the second link 152 attached to the boom head 131 is supported by the rear post 109 by the hydraulic cylinder 153 attached to the second link 152. In the initial state of separation, the cylinder receiving recess 171 of the first link 151 is placed on the connection pin 162. The connection pin 162 is disposed at the inner end 154i of the sliding opening 154h, and the relative angle between the first link 151 and the second link 152 is a minimum angle.

  The hydraulic fluid is supplied from the hydraulic pressure source (not shown) to the bottom chamber of the hydraulic cylinder 153 in the fully contracted state shown in FIG. 9A, and the hydraulic fluid is discharged from the rod chamber and is led to a tank (not shown). When hydraulic oil is supplied to the bottom chamber of the hydraulic cylinder 153, cylinder thrust acts on each of the first link 151 and the second link 152 via the connection pin 162, and cylinder thrust on the rear post 109 via the pin 163. Works.

  The cylinder thrust F1 acting on the first link 151 is decomposed into a force F11 directed to the pin 109a, which is the rotation center of the first link 151 and the second link 152, and a force F12 attempting to rotate the first link 151. .

  When the hydraulic fluid is supplied to the bottom chamber of the hydraulic cylinder 153, the rotational force F12 generated by the thrust of the hydraulic cylinder 153 acts on the first link 151 and the second link 152, and the first link 151 and the second link 152 In the state where the relative angle is the minimum angle, it integrally pivots in the counterclockwise direction with the pin 109a as the center of rotation. Also, the hydraulic cylinder 153 extends. That is, the postures of the first link 151 and the second link 152 are in the order of the posture shown in FIG. 9B, the posture shown in FIG. 9C, and the posture shown in FIG. The first link 151 and the second link 152 stand up.

  FIGS. 10A and 11A are diagrams for explaining how the first link 151 is rotationally driven by the cylinder thrust. 10 (b) is an enlarged view of a portion Xb of FIG. 10 (a), and FIG. 11 (b) is an enlarged view of a portion XIb of FIG. 11 (a). FIG. 10A is a view showing a point in time when the eccentric cam 181 and the follower link 182 start contact in the process of raising the link mechanism 155. As shown in FIG. 10 (b), when the link mechanism 155 is turned so as to stand up, the eccentric cam 181 and the follower link 182 contact at a contact point P at a predetermined angle (hereinafter referred to as the contact start angle). . In the present embodiment, the contact start angle is set to an angle at which the cylinder receiving recess 171 of the first link 151 and the connection pin 162 shift from the contact state to the non-contact state.

  When the hydraulic cylinder 153 is further extended, as shown in FIG. 11, the cylinder receiving recess 171 of the first link 151 and the connecting pin 162 are separated. In the state of FIG. 11, the first link 151 is pivoted counterclockwise by its own weight, and is held by the eccentric cam 181 and the follower link 182 at an angle according to the angle of the second link 152.

  FIGS. 12 (a), 13 (a) and 14 (a) are diagrams for explaining how the first link 151 is rotationally driven by its own weight. 12 (b) is an enlarged view of the XIIb portion of FIG. 12 (a), FIG. 13 (b) is an enlarged view of the XIIIb portion of FIG. 13 (a), and FIG. 14 (b) is an enlarged view of FIG. It is an XIVb part enlarged view. As shown in FIG. 12, if a straight line OG connecting the pivot point of the first link 151 and the center of gravity GP of the first link 151 exceeds the vertical axis (V) and is positioned on the boom 103 side, the first link 151 Turns by its own weight. That is, only the own weight acts on the first link 151.

  In this embodiment, as shown in FIG. 12B, the eccentric cam 181 and the follower are provided in a part of the rotation range in which the rotation limiting mechanism 180 is provided and the weight thereof acts on the first link 151. The link 182 contacts with the contact area C, and the rotation angle of the first link 151 can be suppressed.

  FIG. 13A is a view showing a point in time when contact between the eccentric cam 181 and the follower link 182 ends in the process of laying down the link mechanism 155 to the boom side. As shown in FIG. 13, when the link mechanism 155 pivots so as to lie on the boom side, the contact between the eccentric cam 181 and the follower link 182 ends at a predetermined angle (hereinafter, contact end angle). In the present embodiment, the contact end angle is set to an angle at which the first link 151 is supported by the outer end 154 o of the sliding opening 154 h of the connecting link 154 and the connecting pin 162. Thus, the eccentric cam 181 and the follower link 182 are in contact from the state shown in FIG. 10 to the state shown in FIG. 13 to limit the rotation angle of the link mechanism 155.

  As shown in FIG. 14, when the first link 151 is further turned to lie on the boom 103 side, the connection pin 162 is positioned at the outer end 154 o (see FIG. 5) at the sliding opening 154 h of the connection link 154. Do. As shown in FIGS. 11 to 14, as the first link 151 rotates, the connection pin 162 slides from the inner end 154i of the sliding opening 154h toward the outer end 154o (see FIG. 5). , The relative angle between the first link 151 and the second link 152 is increased. From the state shown in FIG. 14, the first link 151 and the second link 152 integrally rotate in the state where the relative angle is the maximum angle.

  When the link mechanism 155 rotates to the state shown in FIG. 6, the positioning recess 172 of the first link 151 is placed on the pin 168 suspended on the pin support bracket 135 as shown in FIG. Movement is regulated. That is, the pin 168 has a function as a stopper for restricting the rotation of the first link 151. By the positioning recess 172 of the first link 151 and the pin 168 being engaged, the fixed position of the tip of the first link 151 with respect to the boom 103 is determined. That is, the positioning recess 172 and the pin 168 have a function as a positioning portion when the tip of the first link 151 and the boom 103 are coupled. At this time, the hydraulic cylinder 153 is in the most extended state which is the most extended.

  When the first link 151 and the boom 103 are positioned by engagement between the positioning recess 172 and the pin 168, the through hole 170 of the first link 151 and the through hole of the pin support bracket 135 coincide with each other. The fixing pin 160 is inserted through the through hole 170 of the first link 151 and the through hole of the pin support bracket 135 and fixed to the pin support bracket 135 by the stop pin, so that the tip of the first link 151 is the boom head 131 , And the tip end portion of the first link 151 and the boom head 131 are coupled to each other.

  FIGS. 15 to 19 are views for explaining how the rear post 109 is rotationally driven by the post drive device 150. FIG. The front post 108 is omitted in FIGS. Hydraulic fluid is supplied from a hydraulic pressure source (not shown) to the rod chamber of the hydraulic cylinder 153 in the most extended state shown in FIG. 6, and the hydraulic fluid is discharged from the bottom chamber and is led to a tank (not shown). When hydraulic fluid is supplied to the rod chamber of the hydraulic cylinder 153, cylinder thrust acts on the second link 152 and the connection link 154 through the connection pin 162, and cylinder thrust is applied to the rear post 109 through the pin 163. Works.

  The cylinder thrust acting on the second link 152 is decomposed into a force toward the pin 109 a which is the rotation center of the second link 152 and a force to rotate the second link 152. The connection link 154 is attached to a first link 151 coupled to the boom 103. For this reason, even if a force to rotate the second link 152 acts on the second link 152, the rotation of the second link 152 is restricted by the connection link 154 and the first link 151.

  The cylinder thrust F9 acting on the rear post 109 is decomposed into a force F91 directed to the pin 109a, which is the rotation center of the rear post 109, and a rotational force F92 to rotate the rear post 109.

  Therefore, when hydraulic fluid is supplied to the rod chamber of the hydraulic cylinder 153, the rotational force F92 generated by the thrust of the hydraulic cylinder 153 acts on the rear post 109, and the rear post 109 rotates counterclockwise with the pin 109a as the rotation center. Rotate. That is, from the attitude shown in FIG. 6 (a), the attitude shown in FIG. 15 (a), the attitude shown in FIG. 15 (b), the attitude shown in FIG. 15 (c), the attitude shown in FIG. The posture of the rear post 109 shifts in the order of the posture shown in (b), and the rear post 109 stands up. Thereafter, as shown in FIG. 17, the rear post 109 is inclined to the boom 103 side. FIG. 17 is a view showing that the rear post 109 is inclined to the boom side, and the posture shown in FIG. 17 (a), the posture shown in FIG. 17 (b), and the posture shown in FIG. Posture changes.

  In FIG. 17A, the hydraulic cylinder 153 is contracted to its full length. When the hydraulic cylinder 153 is contracted to the full length, as shown in FIG. 17B, the connecting pin 162 is moved from the outer end 154o of the sliding opening 154h of the connecting link 154 to the inner end 154i (see FIG. 5). Slide towards. That is, the second link 152 rotates toward the first link 151, and the relative angle between the first link 151 and the second link 152 decreases. Along with the sliding of the connection pin 162 at the sliding opening 154 h, the rear post 109 is pivoted to approach the boom 103 by its own weight. As shown in FIG. 17C, when the connecting pin 162 moves to the inner end 154i of the sliding opening 154g of the connecting link 154, that is, when the relative angle between the first link 151 and the second link 152 becomes a minimum angle. The link mechanism 155 regulates the rotation of the rear post 109.

  FIG. 18 is a view for explaining an operation of attaching the post side pendant member 141 and the boom side pendant member 142. As shown in FIG. FIG. 18 shows the same state as shown in FIG. 17 (c), and shows the posture in which the rear post 109 falls to the boom 103 side up to the second position (BL).

  The operator releases the fixing by the fixing device 109d to the lower end portion of the post side pendant member 141 and swings the post side pendant member 141 to a position where the post side pendant member 141 extends in the vertical direction. The operator connects the connection end 141 a of the post-side pendant member 141 to the connection end 142 a of the boom-side pendant member 142 via the connection fitting 143.

  The connection fitting 143 is a connection member provided with through holes at both ends. The connection fitting 143 is rotatably attached to the boom side pendant member 142 by inserting a pin into one through hole and the through hole of the connection end 142a in advance. The operator inserts a pin into the other through hole of the connection fitting 143 and the through hole of the connection end portion 141 a to pivotally connect the post side pendant member 141 to the connection fitting 143. Thereby, the post side pendant member 141 and the boom side pendant member 142 are connected via the connection fitting 143.

  FIG. 19 is a view for explaining an operation (tension operation) for stretching the post-side pendant member 141 and the boom-side pendant member 142. The operator operates the switching valve unit so that the hydraulic fluid discharged from the hydraulic pressure source (not shown) is supplied to the bottom chamber of the hydraulic cylinder 153. The operator supplies hydraulic oil to the bottom chamber of the hydraulic cylinder 153 to extend the hydraulic cylinder 153. As a result, the rear post 109 which has been laid down to the second position (BL) rises, and as shown in FIG. 19, the post-side pendant member 141 and the boom-side pendant member 142 are stretched. Thereafter, the worker proceeds to the work of attaching the jib 104 to the boom 103.

  In the above, the operation of attaching the front post 108 and the rear post 109 to the boom 103 and the operation of attaching the post side pendant member 141 and the boom side pendant member 142 have been described. On the other hand, the operation of removing the post-side pendant member 141 and the boom-side pendant member 142 and the operation of removing the front post 108 and the rear post 109 from the boom 103 are reverse procedures, and thus the description is omitted.

According to the embodiment described above, the following effects can be obtained.
(1) In a state where the boom 103 is laid horizontally, a first position (PL) in which the rear post 109 is inclined toward the front post 108 with respect to the vertical axis, and a second position in which the rear post 109 is inclined toward the boom 103 The post drive device 150 which rotates the rear post 109 is provided in the range including the position (BL). The link mechanism 155 of the post drive device 150 has the link side coupling portion (the through hole 170 of the first link 151) and the boom side coupling portion (pin support) in the state where the rear post 109 is disposed at the first position (PL). By contracting the hydraulic cylinder 153 when in the coupled state in which the through hole of the bracket 135 is coupled, one end of the boom side pendant member 142 attached to the boom 103 and one end are attached to the tip of the rear post 109 The rear post 109 is pivoted to the boom side to a second position (BL) where it can be attached to the other end of the post side pendant member 141. As a result, the rear post 109 attached to the boom 103 which has been laid down in a horizontal state and inclined to the front post 108 can be erected to the boom 103 side without using an auxiliary crane. As a result, the assembling and disassembling workability of the crane 100 can be improved.

(2) The first position (PL) is a position where the rear post 109 is inclined to the front post 108 side with respect to the horizontal axis (H) in a state where the boom 103 is laid horizontally, and the second position (PL) BL) is a position where the rear post 109 is inclined to the boom 103 side with respect to the vertical axis (V) in a state where the boom 103 is laid horizontally. That is, the post drive device 150 is provided so that the rear post 109 rotates in a range including the position (H) arranged parallel to the boom 103 and the position (V) arranged orthogonal to the boom 103 It is done. Since the rear post 109 can be laid to the front post 108 side than the position (H) arranged in parallel, improvement in the winding workability of the jib relief rope 113a between the sheave 123 and the sheave 124 can be achieved. it can.

(3) The link mechanism 155 of the post drive device 150 is rotatably attached at one end to the boom 103 and at the other end to the boom-side coupling portion (through hole of the pin support bracket 135) provided on the boom 103 A link side coupling portion (a through hole 170 of the first link 151) detachably coupled is provided. One end of a hydraulic cylinder 153 as an extension actuator of the post driving device 150 is connected to the rear post 109, and the other end is connected to the other end of the link mechanism 155. When the link-side joint and the boom-side joint are in a separated state in a state where the link mechanism 155 and the boom 103 are laid horizontally and the rear post 109 is disposed at the first position (PL) When the hydraulic cylinder 153 is extended, it is configured to rotate to the boom 103 side to a position where the link side coupling portion and the boom side coupling portion can be coupled. By extending the hydraulic cylinder 153, the link side coupling portion and the boom side coupling portion can be aligned, so the workability of attaching the link mechanism 155 to which the rod head of the hydraulic cylinder 153 is attached can be improved.

(4) The first link 151 has one end (proximal end) rotatably attached to the boom, and the other end (distal end) is provided with a link-side joint. The second link 152 has a first end (base end) rotatably attached to the boom, and a second end (tip end) turns to a shaft (connection pin 162) provided at the second end of the hydraulic cylinder 153. It is mounted movable. One end portion of the connection link 154 is rotatably attached to the other end portion (tip end portion) of the first link 151, and a sliding opening 154h in which the connection pin 162 can slide and move is provided. Since the link mechanism 155 is configured by such a plurality of link members, the rotation range of the rear post 109 can be expanded. When the range of rotation of the rear post 109 is expanded, it is intended to improve the workability of hooking the jib relief rope 113a between the sheave 123 and the sheave 124 and the mounting workability of the post side pendant member 141 and the boom side pendant member 142. Can.

(5) The link mechanism 155 extends the hydraulic cylinder 153 in the separated state, and when the first link 151 is rotated to a predetermined angle, the link side coupling portion and the boom side coupling portion are engaged. The first link 151 is configured to rotate by its own weight. The link mechanism 155 is provided with a rotation limiting mechanism 180 which limits an angle at which the link mechanism 155 is pivoted by its own weight by a follower link 182 in contact with the eccentric cam 181. When the rotation limiting mechanism 180 is not provided, the rotation of the link mechanism 155 can not be held when the link mechanism 155 is rotated by the rotational force of its own weight. In the present embodiment, since the rotation limiting mechanism 180 is provided, an increase in the angle at which the link mechanism 155 rotates can be suppressed by the follower link 182 and the eccentric cam 181, and the positioning of the first link 151 can be performed. The impact force when the recess 172 contacts the pin 168 attached to the pin support bracket 135 can be reduced.

(6) The rear post 109 includes a pair of support columns 191 disposed in parallel to each other, and a connecting member 192 connecting the pair of support columns 191. One end of a pair of hydraulic cylinders 153 that constitute the extension actuator is connected to each of the pair of columns 191. The hydraulic cylinder 153 is disposed so as to overlap the support post 191 when viewed from above in a state where the boom 103 is laid down horizontally and the rear post 109 is disposed at the first position (PL). . That is, the rear post 109 and the hydraulic cylinder 153 are configured to rotate in the same virtual plane. Therefore, for example, the rigidity of the connecting member 192 can be reduced as compared to the case where the hydraulic cylinder 153 is connected to the connecting member 192. By making the thrust of the hydraulic cylinder 153 act directly on the support post 191, the weight of the rear post 109 can be reduced. Further, since the hydraulic cylinder 153 is provided for each of the columns 191, the hydraulic cylinder 153 can be miniaturized as compared with the case where a single hydraulic cylinder is connected to the connecting member 192.

The following modifications are also within the scope of the present invention, and one or more of the modifications can be combined with the above-described embodiment.
(Modification 1)
Although the rod head of the hydraulic cylinder 153 is connected to the second link 152 via the connection pin 162 in the above-described embodiment, the present invention is not limited to this. The end of the tube 153 t of the hydraulic cylinder 153 may be connected to the second link 152 via the connection pin 162, and the rod head of the hydraulic cylinder 153 may be connected to the rear post 109.

(Modification 2)
Although the embodiment described above describes the example in which the front post 108 is rotatably attached to the boom head 131, the present invention is not limited to this. For example, the base of the jib 104 may be fixed.

(Modification 3)
Although the hydraulic cylinder 153 is described as an example of the drive source of the post drive device 150 in the embodiment described above, the present invention is not limited to this. For example, a linear motion type extension actuator using an electric motor and a feed screw mechanism may be employed.

(Modification 4)
The post-side pendant member 141 and the boom-side pendant member 142 are not limited to single rod bars or multiple bar bars, and may be made of wire rope.

(Modification 5)
Although the embodiment described above describes the example in which the link mechanism 155 is configured by the first link 151, the second link 152, and the connection link 154, the present invention is not limited to this. The link mechanism 155 may be configured by four or more link members.

(Modification 6)
In the embodiment described above, the mobile crane 100 provided with the traveling body 101 has been described, but the present invention is not limited to this. The invention can also be applied to fixed cranes.

  Although various embodiments and modifications have been described above, the present invention is not limited to these contents. Other embodiments considered within the scope of the technical idea of the present invention are also included within the scope of the present invention.

  Reference Signs List 100 crane, 103 boom, 104 jib, 116 pendant member, 108 front post, 109 rear post, 141 post side pendant member, 142 boom side pendant member, 150 post driving device, 151 first link, 152 second link, 154 connecting link , 154 h Sliding opening, 135 pin support bracket (boom side joint), 153 hydraulic cylinder (telescopic actuator), 155 link mechanism, 170 through hole (link side joint), 180 rotation limiting mechanism, 191 post, 192 Connection member

Claims (5)

A boom, a jib attached to the boom so as to be able to move up and down, a front post rotatably mounted on the tip end side of the boom and connected to the jib via a pendant member, and a turn on the tip end of the boom A rear post that is movably attached and on which a jib rope is hung around the front post, a post side pendant member whose one end is attached to the end of the rear post, and one end is the post side pendant member And a boom side pendant member attached to the other end of the boom attached to the boom, and a post driving device used for a crane,
A connecting portion (hereinafter referred to as a link-side connection) having one end rotatably attached to the boom and the other end detachably connected to a connecting portion provided on the boom (hereinafter referred to as a boom-side connecting portion) Link mechanism provided with
An extendable actuator having one end connected to the rear post and the other end connected to the other end of the link mechanism;
The link mechanism and the link side coupling portion are disposed in a state where the boom is laid horizontally and the rear post is disposed at a first position inclined toward the front post with reference to a vertical axis. When the telescopic actuator is extended when the boom-side joint is in the separated state, the boom-side joint pivots to the boom side to a position where the link-side joint and the boom-side joint can be coupled. When the telescopic actuator is contracted when the link-side joint and the boom-side joint are in a coupled state, the boom-side pendant member attached to the boom is attached to one end of the boom and the tip of the rear post. The rear post to the boom side to a second position where it can be attached to the other end of the post side pendant member Post driving apparatus characterized by being configured to be dynamic. In the post drive device according to claim 1,
The first position is a position where the rear post is inclined to the front post side with respect to a horizontal axis in a state where the boom is laid horizontally.
The post drive device according to claim 1, wherein the second position is a position where the rear post is inclined to the boom side with respect to a vertical axis in a state where the boom is laid horizontally. In the post drive device according to claim 2,
The link mechanism is
A first link rotatably attached at one end to the boom and provided at the other end with the link-side joint;
A second link pivotally attached at one end to the boom and at the other end pivotally attached to a shaft provided at the other end of the telescopic actuator;
And a connecting link having one end rotatably attached to the other end of the first link and the shaft provided with a sliding opening capable of sliding movement. Drive device. In the post drive device according to claim 3,
The link mechanism includes a follower link attached to the second link, and an eccentric cam fixed to a rotation support shaft of the rear post, and the link mechanism includes the follower link and the eccentric cam. A post drive device comprising: a rotation restriction mechanism which restricts an angle at which the wheel rotates. In the post drive device according to claim 1,
The rear post includes a pair of support poles arranged in parallel to each other, and a connecting member connecting the pair of support poles,
The telescopic actuator includes a pair of hydraulic cylinders, one end of which is connected to each of the pair of columns;
The hydraulic cylinder is disposed so as to overlap the column when viewed from above in a state in which the boom is laid horizontally and the rear post is disposed at the first position. Characteristic post drive device.

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