JP6830513B2 - Auxiliary lifting device and hydraulic cylinder - Google Patents

Description

The present invention relates to an auxiliary lifting device and a work machine provided with the auxiliary lifting device.

Cranes equipped with a hydraulic cylinder type auxiliary lifting device for attaching and detaching crawlers by themselves during assembly and disassembly are known. An example of such a crane is shown below.
The hydraulic cylinder type auxiliary lifting device is attached to the ventral side of the lower boom. The auxiliary lifting device is suspended by attaching the upper end of the cylinder tube of the hydraulic cylinder to the lower boom. To assemble the crawler side frame to the main body, attach a hanging rope hooked on the crawler side frame to the shackle provided at the tip of the cylinder rod, and contract the hydraulic cylinder.
The boom is raised with the crawler side frame lifted, the crawler side frame is pulled toward the main body, and the crawler side frame is assembled to the main body using a fastening member.

The hydraulic cylinder type auxiliary lifting device includes a cylinder storage device that stores the hydraulic cylinder in a state of being fixed to the lower boom. The cylinder retracting device includes a mounting plate fixed to the lower boom, a mounting plate provided on the front side of the mounting plate, and a locking plate provided on the back side of the mounting plate.
It is provided with a fixing plate attached to the front side of the cylinder rod and extending to the locking plate side. A recess is formed in the locking plate. In order to store the hydraulic cylinder, a cylindrical lock pin is inserted so as to straddle the recess of the locking plate and the fixing plate (see, for example, Patent Document 1).

Patent No. 5800848

In the structure described in the above-mentioned prior document, the hydraulic cylinder type auxiliary lifting device has a structure in which a cylinder rod is fixed by inserting a cylindrical lock pin so as to straddle the recess of the locking plate and the fixing plate. Cylinder. Therefore, an object of the present invention is to provide a structure that facilitates connection between the fixing portion and the undulating member.

According to one aspect of the present invention, there is an auxiliary lifting device attached to an undulating member that undulates with respect to a work machine, and a hydraulic cylinder having one end side swingably connected to the undulating member, and the hydraulic cylinder. The fixing portion includes a fixing portion provided on the other end side and having a pin insertion hole into which a fixing pin is inserted, and a pin support portion provided on the undulating member and having a pin support hole for supporting the fixing pin. has an abutment surface and positioning surface for contact of undulating said undulating member, the pin support portion and the fixing portion is connectable when the abutting surface and the positioning surface is in contact state It is characterized by becoming.
According to another aspect of the present invention, it is a hydraulic cylinder in which one end side is swingably connected to an undulating member that undulates with respect to a work machine, and the hydraulic cylinder is connected to the undulating member on the other end side. has a fixed portion, the fixed portion, than the connecting position between the relief member provided projecting radially outward of said hydraulic cylinder, said relief member said fixing portion in a connectable state to the relief member It is characterized by having a positioning surface that abuts.

According to the onset bright, with possible coupling state fixing portion and the relief member, since relief member abuts against the positioning surface, coupling is facilitated between the stationary portion and the relief member.

It is a side view which shows one Embodiment of the crane provided with the auxiliary hoisting apparatus of this invention. (A) and (B) show the mast shown in FIG. 1, (A) is a plan view seen from above, and (B) is a side view of (A). (A) to (C) are detailed views of the operation unit provided in the region III of FIG. 2, (A) is a front view, and (B) is a sectional view taken along line IIIB-IIIB of (A). (C) is a diagram in which each pin in (A) is removed. The hydraulic cylinder accommodating portion provided in the region IV of FIG. 2 is shown, and is a front view seen from the X direction. (A) is a perspective view of the hydraulic cylinder storage portion shown in FIG. 4, and (B) is a side view of (A) viewed from the front. (A) to (D) are cross-sectional views for explaining the operation of the hydraulic cylinder storage portion illustrated in FIG. 4, (A) is a locked state, (B) is an unlocked state, and (C) is , A diagram showing a stepped pin regulation state when the mast is in a non-vertical posture, (D) is a partially enlarged view of (C). It is a side view which shows the process of assembling the crawler side frame to the main body. It is a side view which shows the initial process of assembling the lower boom to the upper swing body. It is a side view which shows the process after FIG. It is a side view which shows the process after FIG. It is a side view which shows the process after FIG.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a side view showing an embodiment of a crane provided with the auxiliary lifting device of the present invention.
The crawler crane (hereinafter, simply referred to as a crane) 100 includes a lower traveling body 101 and an upper rotating body 103 that is rotatably provided on the lower traveling body 101 via a swivel wheel 114. The upper swivel body 103 has a swivel frame 103a, and the swivel frame 103a includes a boom foot 104a (see FIG. 9 and the like) which is a base end portion of the boom 104, and a base of a live mast (hereinafter, simply referred to as a mast) 131. A mast foot 131c (see FIG. 2), which is an end portion, is rotatably attached.
In the following description, the front-back direction, the up-down direction, and the left-right direction are as shown in the figure.

The lower traveling body 101 includes a main body body 111 (see FIG. 7) connected to the upper turning body 103.
It has a pair of crawlers that can be detachably attached to both sides of the main body 111.
The crawler includes a crawler side frame 112 and a crawler belt 113 wound around the crawler side frame 112.

The boom 104 has a lower boom 140 and an upper boom 141. Lower boom 1
The 40 and the upper boom 141 are connected by a joint portion 136, and can be divided at the joint portion 136 as a boundary. An undulating winch 106 around which an undulating rope 106a is wound is mounted on the upper swivel body 103. Further, the lower boom 140 is equipped with a hoisting winch 105 around which a hoisting rope 105a is wound.

The hoisting rope 105a is connected to the hook 110 via sheaves 121 and 122 provided at the tip of the boom 104, and the hook 110 is moved up and down by driving the hoisting winch 105.
One end of the pendant rope 107 is connected to the tip of the boom 104, and the pendant rope 1
The other end of 07 is connected to the upper spreader 108. In the upper spreader 108, a plurality of sheaves 108a are arranged on a support shaft 126 extending in the left-right direction.

The undulating rope 106a has an upper spreader 108 and a lower spreader 10 at the top of the mast 131.
When the undulating winch 106 is driven, the distance between the lower spreader 109 and the upper spreader 108 changes, the mast 131 tilts, and the boom 104 undulates.

A driver's cab 123 is provided in front of the upper swing body 103, and an operator operates a plurality of operating members arranged in the driver's cab 123 to perform an undulating winch 106, a hoisting winch 105, and an upper swing body 103. , The lower traveling body 101 is operated to perform crane work such as raising and lowering a suspended load.

An auxiliary lifting device 50 is attached to one surface of the mast 131 on the boom side. The auxiliary lifting device 50 is a self-supporting lifting device provided on the crane 100 itself, which is used when attaching / detaching the crawler side frame 112 to / from the main body 111 or connecting the lower boom 140 to the swivel frame 103a. Details of the auxiliary lifting device 50 will be described later.

A backstop 125 is suspended between the lower boom 140 and the swivel frame 103a. The backstop 125 mechanically regulates the rotation of the boom 104 so that it does not rotate any more when the undulation angle of the boom 104 reaches a predetermined maximum undulation angle. When the boom 104 stands up to the maximum undulation angle, an undulation automatic stop device (not shown) operates to automatically stop the erection of the boom 104.

2 (A) and 2 (B) show the mast illustrated in FIG. 1, FIG. 2 (A) is a plan view viewed from above, and FIG. 2 (B) is FIG. 2 (A). It is a side view. In addition, in FIG. 2A, the mast 131 is perpendicular to the vertical direction in the illustrated left-right, front-back, and vertical directions, in other words.
It will be described below assuming that it is illustrated as a state of standing vertically with respect to the ground.

The masts 131 are provided with a pair of mast bodies 131a that are separated in the left-right direction and extend in the vertical direction, and a body connection portion 131b that connects the upper ends of the pair of mast bodies 131a.
It has a mast reinforcement frame 132 that connects the intermediate portions of the pair of mast bodies 131a, and has a substantially U-shape in a plan view.
A mast foot 131c is provided at the lower end of each mast body 131a of the mast 131. As described above, the mast foot 131c is rotatably supported by the swivel frame 103a. The mast 131 is undulated by the undulating winch 106.

An auxiliary lifting device 50 is provided on one side of the mast 131, in FIG. 2, on the front side. The auxiliary lifting device 50 includes an auxiliary hydraulic cylinder (hereinafter simply referred to as a hydraulic cylinder) 51, a swing mechanism unit 60, a hydraulic cylinder storage unit 70, and an operation unit 80.
The hydraulic cylinder 51 has a cylinder tube 51a and a cylinder rod 51b.
One end of the cylinder tube 51a is swingably connected to the swing mechanism portion 60. An auxiliary hook 52 is connected to the end of the cylinder rod 51b.

The swing mechanism unit 60 has a horizontal link 61 and a vertical link 62. The vertical link 62
It is loosely attached to a support shaft 126 that supports the sheave 108a. The horizontal link 61
It is rotatably connected to a shaft pin 62a (see FIG. 2B) provided on the upper and lower links 62. One end of the cylinder tube 51a of the hydraulic cylinder 51 is rotatably connected to a shaft pin 61a provided on the horizontal link 61. Therefore, the hydraulic cylinder 51 is a mast 13
1 is vertically erected (vertical posture) and is attached to the mast 131 so as to be swingable in the front-rear direction and the left-right direction around the shaft pins 61a and 62a.

The mast 131 has a mast reinforcing frame 132 that connects the pair of mast bodies 131a to an intermediate portion extending in the vertical direction of the pair of mast bodies 131a. The mast reinforcement frame 132 is provided with a hydraulic cylinder storage portion 70.
The operation unit 80 is the mast body 1 of one of the pair of mast bodies 131a (on the right side in this embodiment).
It is provided near the mast foot 131c of 31a. The operation unit 80 and the hydraulic cylinder storage unit 70 are connected by a push-pull cable 84. Although the details will be described later, the hydraulic cylinder 51 is operated by the operation lever 81 (see FIG. 3 etc.) in the operation unit 80, and the cylinder fixing pin 77 (see FIG. 6 etc.) of the hydraulic cylinder storage unit 70 is passed through the push-pull cable 84. ) Is activated to switch between a state in which the mast 131 is stored and a state in which the mast 131 can be released. Hydraulic oil is supplied to and discharged from the hydraulic cylinder 51 via hydraulic pipes 135 attached to the side surfaces of each mast body 131a facing each other.

3 (A) to 3 (C) are detailed views of the operation unit provided in the region III of FIG. 2, and FIG. 3 (A) to FIG.
A) is a front view, FIG. 3 (B) is a sectional view taken along line IIIB-IIIB of FIG. 3 (A), and FIG. 3 (C) shows a state in which each pin in FIG. 3 (A) is removed. It is a figure.
The operation unit 80 includes an operation lever 81, a support plate 82, a lever position fixing pin 83, a mounting member 86, a pivot pin 87, a lock positioning screw 88a, and an unlock positioning screw 88.
It has b. The push-pull cable 84, the operation unit 80, and the cylinder fixing pin 77 of the hydraulic cylinder storage unit 70 constitute a pin drive device for driving the cylinder fixing pin 77, which will be described below.
The push-pull cable 84 and the support plate 82 are attached to the attachment member 86, and the attachment member 86 is fixed to one of the pair of mast bodies 131a of the mast 131.
A grip 81c is attached to the lower end of the operating lever 81.

The pivot pin 87 is inserted into a through hole 151 for a pivot pin provided at one end of the support plate 82 and the tip of the operating lever 81. The operating lever 81 is rotatably supported clockwise and counterclockwise about the pivot pin 87. In FIG. 3A, the position shown by the solid line is the locked position when the operating lever 81 is rotated clockwise, and the position shown by the alternate long and short dash line when the operating lever 81 is rotated counterclockwise. Is the unlock position. A push-pull cable 84 is connected to the intermediate portion of the operating lever 81 in the longitudinal direction.

As shown in FIG. 3C, the support plate 82 has a support plate 82 below the pivot pin through hole 151.
A through hole 152 is provided. Further, a lock positioning screw 88a and an unlock positioning screw 88b are attached to the support plate 82. The lock positioning screw 88a and the unlock positioning screw 88b are arranged at positions symmetrical with respect to the straight line connecting the through hole 151 for the pivot pin and the through hole 152. Semicircular recesses 81a and 81b are provided on the side surfaces of the operating lever 81, respectively, corresponding to the through hole 152 and the lock positioning screw 88a (or the unlock positioning screw 88b).

The lever position fixing pin 83 rotates the operating lever 81 clockwise around the pivot pin 87 as shown by the solid line in FIG. 3A, and the recess 81a is in contact with the lock positioning screw 88a. It can be inserted into the through hole 152 of the support plate 82. Further, the lever position fixing pin 83 rotates the operating lever 81 counterclockwise around the pivot pin 87 as shown by the alternate long and short dash line in FIG. 3A, and unlocks the recess 81b with the unlocking positioning screw 88b. It can be inserted into the through hole 152 of the support plate 82 in a state of being in contact with the support plate 82.

That is, the operating lever 81 is rotated clockwise to lock the recess 81a with the locking positioning screw 88a.
The operating lever 81 is sandwiched between the lock positioning screw 88a and the lever position fixing pin 83 and locked to the lock position. Further, when the operating lever 81 is rotated counterclockwise and the concave portion 81b is in contact with the unlocking positioning screw 88b, the operating lever 81 is sandwiched between the unlocking positioning screw 88b and the lever position fixing pin 83 to unlock. Locked in the locked position.
The operating lever 81 locked in the locked or unlocked position cannot be operated unless the lever position fixing pin 83 is removed.
When the operating lever 81 is rotated toward the lock position, the inner cable of the push-pull cable 84 is pushed forward. When the operating lever 81 is rotated to the unlock position side, the inner cable of the push-pull cable 84 is pulled backward.

In the present embodiment, the hydraulic cylinder storage portion 7 provided in the intermediate portion in the longitudinal direction of the mast 131.
The structure is such that 0 and the operation unit 80 provided near the mast foot 131c of the mast 131 are connected by a push-pull cable 84. As a result, even when the mast 131 is upright,
The operation of retracting and releasing the hydraulic cylinder 51 by the hydraulic cylinder retracting unit 70 is performed by the mast 13.
It can be easily switched by remote control by the operation unit 80 provided at the low position of 1.

FIG. 4 shows a hydraulic cylinder storage portion provided in the region IV of FIG. 2, and is a front view seen from the X direction of FIG. FIG. 5A is a perspective view of the hydraulic cylinder housing portion shown in FIG.
FIG. 5B is a side view of FIG. 5A as viewed from the front. 6 (A) to 6 (D) are cross-sectional views for explaining the operation of the hydraulic cylinder storage portion shown in FIG. 4, FIG. 6 (A) is a locked state, and FIG. 6 (B) is an unlocked state. A state, FIG. 6C is a view showing a locked state by a stepped pin, and FIG. 6D is a partially enlarged view of FIG. 6C.
The hydraulic cylinder storage unit 70 is composed of a fixing mechanism structure on the mast side and a fixing mechanism structure on the hydraulic cylinder side. The fixing mechanism structure on the hydraulic cylinder side has a fixing member 71 provided at the other end of the tube of the hydraulic cylinder and in which the fixing plate 72 is integrated. The fixing mechanism structure on the mast side is provided on the mast reinforcing frame 132, and the holding member 74 having the pair of guide plates 73, the pair of support plates 78 and the bearing 79, and the cylinder fixing connected to the other end of the push-pull cable 84. It has a pin 77.

Referring to FIG. 5A, the fixing member 71 is provided with a fixing plate 72 projecting rearward. The fixing member 71 is attached to the lower end of the cylinder tube 51a of the hydraulic cylinder 51. The fixing plate 72 is formed by projecting a plate material along the axis of the cylinder tube 51a of the hydraulic cylinder 51 to the rear side. The fixing plate 72 is provided with a locking pin hole 72a (see FIG. 6 and the like) that penetrates in the thickness direction (left-right direction). Lock pin hole 72a
Is a pin insertion hole into which the fixing pin 77 described later is inserted.
With reference to FIG. 6D, the holding member 74 has a pair of pin support plates 7 separated from each other in the left-right direction.
8 is provided. A pin support hole 78a is formed in each pin support plate 78. A bearing 79 is provided on one of the pair of pin support plates 78, that is, on the outer surface of the pin support plate 78 on the right side in FIG. 6 (D).

Each guide plate 73 is formed with an inclined surface 73a that is inclined in a direction that reduces the distance of the separated portion from the tip end side on the side surfaces that face each other. When the hydraulic cylinder 51 is retracted, the fixed plate 72 is guided by the inclined surface 73a of each guide plate 73 and is paired with the pair of guide plates 73 even when the hydraulic cylinder 51 is displaced in the left-right direction. It is inserted into the separating portion of the support plate 78. Note that FIG. 5A shows the swing direction Y of the hydraulic cylinder 51.
The pin hole 78a has the same diameter as the pin insertion hole 72a of the locking fixing pin 77 of the fixing plate 72. Further, the central axis of the pin hole 78a, the central axis of the bearing 79, and the central axis of the locking pin hole 72a of the fixed plate 72 are brought into contact with the holding member 74 by the tip surface (positioning surface) 72b of the fixed plate 72. The position is set to be coaxial in the state of FIG. 6B in contact with the surface 74a.

A cylinder fixing pin 77 is connected to the other end of the inner cable of the push-pull cable 84. The tip of the cylinder fixing pin 77 is supported by a bearing 79.

When the tip of the fixing plate 72 is in contact with the positioning surface 74a, the central axis of the locking pin hole 72a of the fixing plate 72 is the pin support hole 78 of the pair of pin support plates 78.
When the operation lever 81 of the operation unit 80 is set to the lock position while being positioned coaxially with a,
The inner cable of the push-pull cable 84 is pushed forward, and the cylinder fixing pin 77 penetrates the locking pin hole 72a of the fixing plate 72 as shown in FIG. 6 (A). In this state, the fixing plate 72 is restricted from moving in the front-rear direction by the cylinder fixing pin 77. That is, the hydraulic cylinder 51 is locked in the retracted state.
When the operation lever 81 of the operation unit 80 is set to the unlocked position, the inner cable of the push-pull cable 84 moves to the right, and as shown in FIG. 6B, the cylinder fixing pin 77
Is pulled out from the locking pin hole 72a of the fixing plate 72. In this state, the fixing plate 72 can move in the front-rear direction. That is, the hydraulic cylinder 51 is in an unlocked state that can be released from the retracted position.

The cylinder fixing pin 77 has a stepped structure in which the intermediate portion 77a in the axial direction has a smaller diameter than the root side and the tip side. In the locked state, the intermediate portion 77a is arranged at a position facing the locking pin hole 72a of the fixing plate 72. Hydraulic cylinder 5 even in the locked state
1 is in a state in which it can swing around the shaft pins 61a and 62a connected to the swing mechanism portion 60.
When the mast 131 is in an inclined state (non-vertical posture), the hydraulic cylinder 51 swings downward, and as shown in FIG. 6C, the inner circumference of the locking pin hole 72a of the fixing plate 72. The surface is in contact with the outer peripheral surface of the intermediate portion (small diameter portion) 77a of the cylinder fixing pin 77.
In this state, the stepped portions (steps between the large diameter portions at both ends and the small diameter portion at the center) of the left and right side surfaces of the cylinder fixing pin 77 are in contact with each side surface of the fixing plate 72, respectively.
Therefore, the operation lever 81 of the operation unit 80 cannot be moved from the locked position to the unlocked position. That is, even if the lever position fixing pin 83 is pulled out to operate the operating lever 81 from the locked position to the unlocked position, the cylinder fixing pin 77 has a stepped structure, and the movement of the fixing plate 72 is restricted. Therefore, undesired swinging when the lock release operation of the hydraulic cylinder 51 is performed in a posture in which the mast 131 is not vertical is prevented.

As described above, in the present embodiment, the structure is such that semicircular recesses 81a and 81b are provided at the contact portions between the lock positioning screw 88a and the unlock positioning screw 88b of the operating lever 81. Therefore, the operation of the operation lever 81 can be ensured not at the position halfway, but at the position where it comes into contact with the lock positioning screw 88a or the unlock positioning screw 88b. As a result, the cylinder fixing pin 77 is securely attached to the intermediate portion 77a.
Can be moved to a position corresponding to the fixed plate 72. Also, the cylinder fixing pin 7
7 can be reliably moved to a position where the fixing plate 72 can be released.

A method of assembling the crane 100 will be described with reference to FIGS. 7 to 11.
FIG. 7 is a side view showing a process of assembling the crawler side frame to the main body.
As shown in FIG. 7, before the crawler side frame 112 is attached, the main body 111 and the swivel frame 103a are connected via the swivel wheel 114. An cab 123 is attached to the swivel frame 103a. Further, a mast 131 is rotatably attached to the swivel frame 103a with the mast foot 131c rotatably attached to a mounting portion of the swivel frame 103a. The swivel frame 103a is equipped with an undulating winch 106, an upper spreader 108, a lower spreader 109, an undulating rope 106a, and an undulating hydraulic cylinder (not shown). Further, the mast 131 is equipped with an auxiliary lifting device 50 including a hydraulic cylinder 51 and an auxiliary hook 52.

The auxiliary lifting device 50 is in a state in which the operating lever 81 of the operating unit 80 is moved to the locked position and the movement to the unlocked position is restricted by the lever position fixing pin 83. From this state, the swivel frame 103a is swiveled 90 degrees. With the mast 131 in the vertical position, the operation unit 8
Pull out the lever position fixing pin 83 of 0 from the through hole 152 of the support plate 82, and pull out the operating lever 81.
Move from the locked position to the unlocked position. Then, the lever position fixing pin 83 is inserted into the through hole 152 of the support plate 82 so that the movement to the lock position is restricted. As a result, as shown in FIG. 7, the hydraulic cylinder 51 is released from the mast 131 and is swingably connected to the mast 131 at the shaft pins 61a and 62a.

The hanging rope 161 is hung on the crawler side frame 112, and the tip of each hanging rope 161 is slid on the auxiliary hook 52. Then, the hydraulic cylinder 51 is contracted to lift the crawler side frame 112. When the mast 131 is raised in this state, the crawler side frame 112 approaches the main body 111 side. Pull the crawler side frame 112 to a predetermined position and use pins, bolts, etc. (not shown) to pull the crawler side frame 1 into the crawler side frame 1.
12 is connected to the main body 111. Next, the swivel frame 103a is swiveled 180 degrees.
Another crawler side frame 112 is connected to the main body 111.
In the present embodiment, the crawler side frame 112 can be attached to the main body 111 by using the auxiliary lifting device 50 before attaching the lower boom 140 to the main body 111. In order to assemble the lower boom 140 to the main body 111, another crane for lifting the lower boom 140 is required, and a large area of the assembly site is required. On the other hand, according to the first embodiment, assembly is possible even if the site of the work site is small.

Next, the lower boom 140 is attached to a crane in which a crawler is attached to the main body 111.
As shown in FIG. 8, the mast 131 is tilted forward to attach a hanging tool such as a shackle and a hanging rope 162 (see FIG. 9). In addition, in FIG. 8, in order to show the size of the crane, the worker is shown in comparison with the size of the crane.
Then, as shown in FIG. 9, a high-floor trailer (not shown) equipped with the lower boom 140 is brought close to the crane 100. One end of the backstop 125 is connected to the lower boom 140. The other end of each suspension rope 162 is hooked on the lower boom 140 to contract the hydraulic cylinder 51 so that the lower boom 140 is lifted from the raised floor trailer. Boom foot 1 of the lower boom 140 due to the undulation and turning operation of the mast 131 and the undulating operation of the hydraulic cylinder 51.
The position of 04a is adjusted so that it is aligned with the mounting portion of the swivel frame 103a. Then, a connecting pin is inserted into each connecting hole of the boom foot 104a and the swivel frame 103a of the lower boom 140 to undulately connect the lower boom 140 to the swivel frame 103a.

Although not shown, the stilt trailer will be moved after this. Then, the hydraulic cylinder 51 is extended to ground the coupling portion 136 side of the lower boom 140 with the upper boom 141, and the hanging tool and the hanging rope 162 are removed from the auxiliary hook 52.

After that, as shown in FIG. 10, the mast 131 is erected so as to be substantially vertical. It may rotate slightly counterclockwise than vertically.
In this state, as shown in FIG. 5 and the like, the hydraulic cylinder 51 rotates clockwise, the fixing plate 72 is inserted into the separation portion between the pair of guide plates 73 and the pair of support plates 78, and the positioning surface 72b Abuts on the contact surface 74a of the holding member 74. At this time, an inclined surface 73a is formed on each guide plate 73. Further, one end of the hydraulic cylinder 51 is attached to the mast 131 so as to be swingable in the front-rear direction and the left-right direction. Therefore, even if the cylinder rod 51b side of the hydraulic cylinder 51 is displaced in the left-right direction, the fixed plate 72 still has the inclined surface 73 of the guide plate 73.
Guided by a, it is inserted into a separation portion between the pair of guide plates 73 and the pair of support plates 78. In other words
Even when working at a work site where the crane 100 is tilted in the left-right direction, the hydraulic cylinder 51 can be reliably stored.

When the fixing plate 72 is inserted into the separating portion of the pair of support plates 78 and comes into contact with the holding member 74,
As shown in FIG. 6B, the central axis of the pin hole 78a of the pin support plate 78 and the locking pin hole 72a of the fixing plate 72 are coaxial. Here, the lever position fixing pin 83 of the operation unit 80 is pulled out from the through hole 152 of the support plate 82, and the operation lever 81 is moved from the unlock position to the lock position. By this operation, the cylinder fixing pin 77 penetrates the locking pin hole 72a of the fixing plate 72. Therefore, the hydraulic cylinder 51 has a lock pin hole 72.
The movement in the left-right direction and the front-back direction is regulated by a. After moving the operating lever 81 from the unlocked position to the locked position, the lever position fixing pin 83 of the operating portion 80 is inserted into the through hole 152 of the support plate 82. As a result, the operation of the operating lever 81 from the locked position to the unlocked position is restricted.

Next, the mast 131 is rotated clockwise as shown in FIG. Then, the tip of the undulating rope 106a is connected to the pendant rope 107.
At this time, since the mast 131 is inclined forward, a force is applied to the hydraulic cylinder 51 to rotate the cylinder rod 51b side counterclockwise due to its own weight. Therefore, FIG. 6 (C)
As shown in the above, the fixing plate 72 is in a state where the inner peripheral surface of the locking pin hole 72a is in contact with the outer periphery of the intermediate portion 77a of the cylinder fixing pin 77. In this state, the left and right step portions of the cylinder fixing pin 77 are in contact with each side surface of the fixing plate 72, respectively, and the movement in the front-rear direction is restricted. Therefore, even if the lever position fixing pin 83 of the operation unit 80 is forgotten to be inserted into the through hole 152 of the support plate 82, the operation lever 81 of the operation unit 80
Cannot be moved from the locked position to the unlocked position. As a result, the hydraulic cylinder 5
It is possible to prevent 1 from being released from the mast 131.

When performing this work, if the hydraulic cylinder 51 does not have a structure for storing in the mast 131, the hydraulic cylinder 51 is counterclockwise around one end attached to the mast 131 as shown by the dotted line. Rotate. Therefore, the hydraulic cylinder 51 interferes with the lower boom 140. By adopting a structure in which the hydraulic cylinder 51 can be stored in the mast 131 as in the first embodiment, such a state can be avoided.

After this, although not shown, the following work is performed.
(1) The upper boom 141 to which the sheaves 121, 122 and the like are attached is conveyed, and the lower boom 140 and the upper boom 141 are connected by the joint portion 136.
(2) The hoisting winch 105 is driven to feed the hoisting rope 105a, and the sheaves 121 and 1
Wind around 22 and hook 110. Then, the hoisting rope 105a is wound up and the hook 11
Pull up 0.
(3) The undulating winch 106 is driven to wind up the undulating rope 106a to erect the boom 104.
As a result, the crane 100 can be assembled as shown in FIG.
To disassemble the crane 100, the procedure opposite to that of assembly may be performed.

According to one embodiment of the present invention, the following effects are obtained.
(1) When the auxiliary lifting device 50 is inserted and removed by the pin drive device and inserted into the lock pin hole 72a of the fixing plate 72, the auxiliary lifting device 50 is fixed to the mast 131 and pulled out from the lock pin hole 72a. Then, the auxiliary lifting device 50 is provided with a stepped cylinder fixing pin 77 that can be released from the mast 131. Therefore, even when the mast 131 is tilted forward, the fixing plate 72 fixed to the hydraulic cylinder 51 has a lock pin hole 7.
The inner peripheral surface of 2a is in contact with the stepped portion of the cylinder fixing pin 77. As a result, even if the movement of the operation lever 81 of the operation unit 80 is not locked, the hydraulic cylinder 51
Can be prevented from being released from the mast 131.

(2) The pin drive device includes a push-pull cable 84 and an operation unit 80 for operating the push-pull cable 84, and the operation unit 80 includes an operation lever 81 operated at a lock position and an unlock position. It has a lever position fixing pin 83 which is provided on the path between the lock position where the operation lever 81 moves and the unlock and is a blocking member which prevents the operation lever 81 from moving. Therefore, when the lever position fixing pin 83 is attached, it is not possible to switch between the locked position and the unlocked position of the operating lever 81. Therefore, the hydraulic cylinder 51
It is possible to improve the reliability of ensuring the stored state.

(3) The operation unit 80 is provided on the mast foot 131c side of the mast 131, and the cylinder fixing pin 77 is provided in the intermediate portion of the mast 131 in the longitudinal direction. Therefore, mast 13
The operation unit 80 provided at the lower position of 1 can remotely control the switching between the locked state and the unlocked state of the hydraulic cylinder 51.

(4) A pair of guide plates 73 for guiding the fixed plate 72 to the lock position are further provided, and the guide plates 73 are arranged so as to form a separating portion through which the fixed plate 72 is inserted, and each guide plate 73 is arranged.
The side surface of the fixed plate 72 facing the fixed plate 72 is an inclined surface for guiding the movement of the fixed plate 72 to the lock position. Therefore, even if the cylinder rod 51b side of the hydraulic cylinder 51 is displaced in the left-right direction, the fixing plate 72 is guided by the inclined surface 73a of the guide plate 73 and inserted into the separated portion of the pair of support plates 78. As a result, the hydraulic cylinder 51 can be reliably stored even when the mast 131 in the vertical posture works at a work site where the crane 100 is tilted in the left-right direction.

It can also be explained that the auxiliary lifting device of the embodiment described above is configured as follows.
(5) In the auxiliary lifting device 50 having a hydraulic cylinder, one end of a cylinder tube 51a is swingably connected to a mast 131, and a hook 52 is attached to the tip of a cylinder rod 51b. The auxiliary lifting device 50 has a fixing plate 72 provided on the other end side of the cylinder tube 51a and having a pin insertion hole 72a into which the fixing pin 77 is inserted, and both ends 77b of the fixing pin 77 provided on the mast 131. It includes a pair of pin support portions 78 having pin support holes 78a to support. The fixing pin 77 is inserted into the pin insertion hole 72a and the pin support hole 78a to fix the auxiliary lifting device 50 to the mast 131. The fixing pin 77 is a pair of support portions 7 provided at both ends thereof.
It has a large diameter portion 77b supported by 8 and a small diameter portion 77a provided at the center of the fixing pin 77, which has a smaller diameter than the large diameter portion 77b.
When the mast 131 is in the non-vertical posture, the auxiliary lifting device 50 swings slightly and tries to be in the vertical posture. At this time, the fixing plate 72 is supported by the small diameter portion 77a. Therefore, even if the fixing pin 77 is pulled out in this state, the stepped surface between the pin small diameter portion 77a and the large diameter portion 77b is the fixing plate 72.
The fixing pin 77 is hard to pull out because it is locked to the side surface of the.
Instead of the pair of support plates 78 that support both ends of the fixing pin 77, a support portion having an integral structure having pin support holes 78a and a pair of support walls provided opposite to each other may be used. Good. Further, instead of the fixing plate 72 having the pin insertion hole 72a, various types of fixing portions having the pin insertion hole 72a can be used.

(6) In the auxiliary lifting device 50 described in (5) above, the fixing plate 72 has a positioning surface 72b.
(Fig. 4). The auxiliary lifting device 50 has a holding member 74 provided on the mast 131 side. The holding member 74 has a contact surface 74a that the positioning surface 72b of the fixing plate 72 comes into contact with when the hydraulic cylinder 51 is fixed to the mast 131 by the fixing pin 77. Mast 131
When is in the vertical posture, the hydraulic cylinder 51 is also in the substantially vertical posture. In this state, when the positioning surface 72b of the fixing plate 72 abuts on the contact surface 74a of the holding member 74, the pin insertion hole 72a of the fixing plate 72 and the pin support hole 78a of the pair of pin support portions 78 are coaxial with each other. Be placed.
Therefore, the fixing pin 77 can be easily inserted and removed.

The crane provided with the auxiliary lifting device of the embodiment described above includes the work machine main body, the undulation winch 106 that adjusts the undulation angle of the boom 104 by tilting the mast 131 provided on the work machine main body, and the boom side of the mast 131. The auxiliary hoisting device 50 according to the above (5) to (8) is provided so as to be swingably connected to the above.
Since the auxiliary lifting device 50 is provided on the surface of the mast 131 on the boom side, the auxiliary lifting device 50 can be used for disassembling and assembling the lower boom 140.

In the above-described embodiment, the case where the auxiliary lifting device is mounted on the crane 100 has been described. However, the auxiliary lifting device of the present invention can be mounted not only on a crane but also on civil engineering with an undulating mast, various foundation machines for construction, and construction machines.

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

50 Auxiliary lifting device 51 Auxiliary hydraulic cylinder 72 Fixing plate (fixing plate)
72a Lock pin hole 73 Guide plate 73a Inclined surface 77 Cylinder fixing pin 78 Pin support plate (support part)
78a Pin hole 80 Operation unit 81 Operation lever 83 Lever position fixing pin 84 Push-pull cable 100 Crane (working machine)
131 Live mast (mast)
131c must foot

Claims (5)

An auxiliary lifting device attached to an undulating member that undulates with respect to a work machine.
A hydraulic cylinder whose one end side is swingably connected to the undulating member,
A fixing portion provided on the other end side of the hydraulic cylinder and having a pin insertion hole into which a fixing pin is inserted,
A pin support portion provided on the undulating member and having a pin support hole for supporting the fixing pin is provided.
The fixing portion has a positioning surface that comes into contact with the contact surface of the undulating member .
An auxiliary lifting device characterized in that the pin support portion and the fixing portion are in a connectable state when the contact surface and the positioning surface are in contact with each other. In the auxiliary lifting device according to claim 1 ,
The previous SL connectable state, the auxiliary lifting device, characterized in that said fixing pin is a state in which the pin insertion hole and the pin support hole is disposed possible insertion location. In the auxiliary lifting device according to claim 2,
The fixing pin, which is inserted into the pin insertion hole and the pin support hole to fix the hydraulic cylinder to the undulating member, has a stepped portion.
The fixing pin by said stepped portion and the fixing portion abuts, the transfer from the pin insertion hole and the pin support holes to the fixing pin passing direction, characterized in that it is regulated auxiliary suspended Upper device. In the auxiliary lifting device according to claim 2 or 3.
Further comprising a pin puller for insertion of the fixing pin relative to the pin support hole of the pin insertion hole of the fixing portion and the pin support portion,
An auxiliary lifting device characterized in that the operation unit of the pin drive device is provided at a position on the work machine side of the undulating member with respect to the fixing pin . A hydraulic cylinder whose one end is swingably connected to an undulating member that undulates with respect to a work machine.
The hydraulic cylinder has a fixing portion connected to the undulating member on the other end side.
The fixing portion than the connecting position between the relief member provided projecting radially outward of said hydraulic cylinder, having a positioning surface to the fixing unit comes into contact with the undulating member connectable with said relief member A hydraulic cylinder characterized by that.