JP2019163173A - Auxiliary lifting device and cylinder - Google Patents

Abstract

To provide an auxiliary lifting device which prevents a hydraulic cylinder from being unlocked from a stored state when it is mounted on a main body of a work machine and a mast is in a non-vertical posture.SOLUTION: The auxiliary lifting device includes a hydraulic cylinder 51 suspended from a mast to be swingable, a fixed plate 72 fixed to the auxiliary lifting device and provided with a pin insertion hole 72a, a pin driving device fixed to the mast, and a stepped pin 77 inserted to or removed from the pin driving device in that when it is inserted in the pin insertion hole 72a of the fixed plate 72, the auxiliary lifting device is fixed to the mast and when it is removed from the pin insertion hole 72a, the auxiliary lifting device can be released from the mast.SELECTED DRAWING: Figure 6

Description

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

A crane equipped with a hydraulic cylinder type auxiliary lifting device for attaching and detaching a crawler by itself during assembly and disassembly is known. An example of such a crane is shown below.
The hydraulic cylinder type auxiliary lifting device is attached to the stomach 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. The crawler side frame is assembled to the main body by attaching a hanging rope hooked on the crawler side frame to the shackle provided at the tip of the cylinder rod and contracting the hydraulic cylinder.
The boom is raised while the crawler side frame is 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 storage device includes a mounting plate fixed to the lower boom, a mounting plate provided on the front side of the mounting plate, a locking plate provided on the back side of the mounting plate,
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 concave portion of the locking plate and the fixed plate (see, for example, Patent Document 1).

Patent No. 5800848

In the structure described in the above-mentioned prior document, since the hydraulic cylinder type auxiliary lifting device is attached to the lower boom, the lower boom cannot be assembled and disassembled using the hydraulic cylinder type auxiliary lifting device. In addition, the cylinder rod is fixed by inserting a cylindrical lock pin so as to straddle the concave portion of the locking plate and the fixing plate, and the lock pin itself is locked in a fixed state. Absent.

According to one aspect of the present invention, in an auxiliary lifting device having a hydraulic cylinder, one end of a cylinder tube is swingably connected to a mast, and a hook is attached to the tip of a cylinder rod. This auxiliary lifting device is provided on the other end side of the cylinder tube with a pin insertion hole into which a fixing pin is inserted, and a pin support portion having a pin support hole provided on the mast to support the fixing pin. With. The fixing pin is inserted into the pin insertion hole and the pin support hole to fix the hydraulic cylinder to the mast. The fixing pin has a large-diameter portion supported by pin support portions provided at both ends thereof, and a small-diameter portion provided in the center and having a diameter smaller than that of the large-diameter portion.
According to another aspect of the present invention, the work machine includes a work machine main body, a hoisting device that adjusts a hoisting angle of the boom by tilting the mast provided on the work machine main body, and a swingable connection to the boom side of the mast. And the auxiliary lifting device.

According to the work machine of the present invention, the auxiliary lifting device having the hydraulic cylinder can be used even when the boom is assembled and disassembled. According to the auxiliary lifting device of the present invention, the pin having the stepped portion is inserted into the pin insertion hole of the fixing portion, and the hydraulic cylinder is fixed to the mast. In a state where the mast installed on the work machine is in a non-vertical posture and the auxiliary lifting device is fixed to the mast, when a force for pulling out the pin is applied, the stepped portion of the pin is locked to the fixed portion and the pin is pulled out I can't.

It is a side view showing one embodiment of a crane provided with the auxiliary lifting device of the present invention. (A), (B) shows the mast shown in FIG. 1, (A) is a plan view seen from above, and (B) is a side view of (A). (A)-(C) are the detailed drawings of the operation part provided in the area | region III of FIG. 2, (A) is a front view, (B) is the IIIB-IIIB sectional view taken on the line of (A). (C) is a diagram of a state in which each pin in (A) is removed. It is the front view which showed the hydraulic cylinder storage part provided in the area | region IV of FIG. 2, and was seen from the X direction. (A) is the perspective view of the hydraulic cylinder storage part illustrated in FIG. 4, (B) is the side view which looked at (A) from the front. (A)-(D) are sectional drawings for demonstrating operation | movement of the hydraulic-cylinder storage part illustrated in FIG. 4, (A) is a locked state, (B) is an unlocked state, (C) is The figure which shows the stepped pin control state when a mast is a non-vertical attitude | position, (D) is the elements on larger scale of (C). It is a side view which shows the process of assembling a crawler side frame to a main body body. It is a side view showing the initial process of assembling the lower boom to the upper swing body. It is a side view which shows the process after FIG. FIG. 10 is a side view showing a step subsequent to FIG. 9. 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.
A crawler crane (hereinafter simply referred to as a crane) 100 includes a lower traveling body 101 and an upper revolving body 103 that is turnably provided on the lower traveling body 101 via a revolving wheel 114. The upper swing body 103 includes a swing frame 103a. The swing frame 103a includes a boom foot 104a (see FIG. 9 and the like) that 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-rear direction, the up-down direction, and the left-right direction are as illustrated.

The lower traveling body 101 includes a main body 111 (see FIG. 7) connected to the upper swing body 103,
A pair of crawlers is detachably attached to both side portions 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
40 and the upper boom 141 are coupled by a coupling part 136 and can be divided at the coupling part 136 as a boundary. A hoisting winch 106 around which a hoisting rope 106 a is wound is mounted on the upper swing body 103. The lower boom 140 is equipped with a hoisting winch 105 around which a hoisting rope 105a is wound.

The hoisting rope 105 a is connected to the hook 110 via sheaves 121, 122 provided at the tip of the boom 104, and the hook 110 moves up and down by driving the hoisting winch 105.
One end of a 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 hoisting rope 106a is composed of an upper spreader 108 and a lower spreader 10 at the top of the mast 131.
9 (see FIG. 7 and the like) and when the hoisting 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 rises and lowers.

A driver's cab 123 is provided in front of the upper swing body 103, and an operator operates a plurality of operation members disposed in the driver's cab 123, so that the hoisting winch 106, the hoisting winch 105, and the upper swing body 103 are operated. Then, the lower traveling body 101 is operated to perform crane work such as lifting and lowering the 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-lifting device provided on the crane 100 itself, which is used when the crawler side frame 112 is attached to and detached from the main body 111 or the lower boom 140 is connected to the turning 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 turning frame 103a. The backstop 125 mechanically restricts the rotation of the boom 104 so that the boom 104 does not rotate any further when the undulation angle of the boom 104 reaches a predetermined maximum undulation angle. When the boom 104 stands up to the maximum raising / lowering angle, a raising / lowering automatic stop device (not shown) works to automatically stop the raising of the boom 104.

2 (A) and 2 (B) show the mast shown in FIG. 1, FIG. 2 (A) is a plan view seen from above, and FIG. 2 (B) is a plan view of FIG. 2 (A). It is a side view. In FIG. 2A, the mast 131 is perpendicular to the vertical direction, in other words, with respect to the illustrated left and right, front and rear, and vertical directions.
The following description will be given on the assumption that it is shown as standing upright on the ground.

The mast 131 is provided to be spaced apart in the left-right direction and extends in the up-down direction, and a main body connection portion 131b that connects the upper ends of the pair of mast main bodies 131a,
And a mast reinforcing frame 132 for connecting intermediate portions of the pair of mast main bodies 131a, and has a substantially U shape in 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 pivotally supported by the turning frame 103a. The mast 131 is raised and lowered by the raising and lowering 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 connected to the swing mechanism 60 so as to be swingable. An auxiliary hook 52 is connected to the end of the cylinder rod 51b.

The swing mechanism unit 60 includes a horizontal link 61 and an upper and lower link 62. The vertical link 62 is
It is attached to a support shaft 126 that supports the sheave 108a in a loose fit. The horizontal link 61 is
The shaft pin 62a (see FIG. 2B) provided on the vertical link 62 is rotatably connected. One end of the cylinder tube 51 a of the hydraulic cylinder 51 is rotatably connected to a shaft pin 61 a provided on the horizontal link 61. Accordingly, the hydraulic cylinder 51 is provided with the mast 13
1 is vertically 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 includes a mast reinforcing frame 132 that connects the pair of mast main bodies 131a to an intermediate portion extending in the vertical direction of the pair of mast main bodies 131a. The mast reinforcement frame 132 is provided with a hydraulic cylinder storage 70.
The operation unit 80 is a mast main body 1 of one of the pair of mast main bodies 131a (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 details will be described later, the hydraulic cylinder 51 is configured such that the cylinder fixing pin 77 (see FIG. 6 and the like) of the hydraulic cylinder storage unit 70 is operated via the push-pull cable 84 by the operation of the operation lever 81 (see FIG. 3 and the like) in the operation unit 80. ) Is switched between a state stored in the mast 131 and a state releasable from the mast 131. The hydraulic oil is supplied to and discharged from the hydraulic cylinder 51 through hydraulic pipes 135 attached to the mutually opposing side surfaces of the mast bodies 131a.

FIGS. 3A to 3C are detailed views of the operation unit provided in the region III of FIG.
A) is a front view, FIG. 3B is a cross-sectional view taken along the line IIIB-IIIB in FIG. 3A, and FIG. 3C is a state in which each pin in FIG. 3A is removed. FIG.
The operation unit 80 includes an operation lever 81, a support plate 82, a lever position fixing pin 83, an attachment member 86, a pivot pin 87, a lock positioning screw 88a, and an unlock positioning screw 88.
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 driving device that drives the cylinder fixing pin 77 described below.
The push-pull cable 84 and the support plate 82 are attached to an attachment member 86, and the attachment member 86 is fixed to one of the pair of mast main bodies 131 a of the mast 131.
A grip 81 c is attached to the lower end of the operation lever 81.

The pivot pin 87 is inserted into a pivot pin through hole 151 provided at one end of the support plate 82 and the tip of the operation lever 81. The operation lever 81 is supported so as to be pivotable clockwise and counterclockwise about the pivot pin 87. 3A, the operation lever 81 is rotated clockwise, the position shown by the solid line is the locked position, and the operation lever 81 is rotated counterclockwise by the two-dot chain line. Is in the unlock position. A push-pull cable 84 is connected to an intermediate portion in the longitudinal direction of the operation lever 81.

As shown in FIG. 3C, the support plate 82 has a pivot pin through-hole 151 below it.
A through hole 152 is provided. The support plate 82 is provided with a lock positioning screw 88a and an unlock positioning screw 88b. The lock positioning screw 88 a and the unlock positioning screw 88 b are disposed at positions symmetrical with respect to a straight line connecting the through hole 151 for the pivot pin and the through hole 152. On the side surface of the operation lever 81, semicircular recesses 81a and 81b are provided corresponding to the through hole 152 and the lock positioning screw 88a (or the unlock positioning screw 88b), respectively.

As shown by the solid line in FIG. 3A, the lever position fixing pin 83 rotates clockwise around the pivot pin 87 and the recess 81a is in contact with the lock positioning screw 88a. The support plate 82 can be inserted into the through hole 152. Further, the lever position fixing pin 83 rotates the operation lever 81 counterclockwise about the pivot pin 87 as shown by a two-dot chain line in FIG. 3A, and the recess 81b is unlocked by the 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 operation lever 81 is rotated in the clockwise direction, and the recess 81a is locked with the lock positioning screw 88a.
In the state where it abuts, the operation lever 81 is sandwiched between the lock positioning screw 88a and the lever position fixing pin 83 and locked at the lock position. When the operation lever 81 is rotated counterclockwise and the recess 81b is in contact with the unlock positioning screw 88b, the operation lever 81 is sandwiched between the unlock positioning screw 88b and the lever position fixing pin 83 and unlocked. Locked to the locked position.
The operation lever 81 locked in the lock position or the unlock position cannot be operated unless the lever position fixing pin 83 is removed.
When the operation lever 81 is rotated to the lock position side, 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 middle portion of the mast 131 in the longitudinal direction.
0 and an 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 standing,
The operation of storing and releasing the hydraulic cylinder 51 by the hydraulic cylinder storage unit 70 is performed in accordance with the mast 13.
1 can be easily switched by remote operation with the operation unit 80 provided at a low position.

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

Referring to FIG. 5A, the fixing member 71 is provided with a fixing plate 72 protruding rearward. The fixing member 71 is attached to the lower end portion of the cylinder tube 51 a of the hydraulic cylinder 51. The fixed 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) penetrating in the thickness direction (left-right direction). Lock pin hole 72a
Is a pin insertion hole into which a fixing pin 77 described later is inserted.
Referring to FIG. 6D, the holding member 74 has a pair of pin support plates 7 spaced apart in the left-right direction.
8 is provided. Each pin support plate 78 is formed with a pin support hole 78a. A bearing 79 is provided on one of the pair of pin support plates 78, that is, on the outer surface of the right side pin support plate 78 in FIG.

Each guide plate 73 is formed with inclined surfaces 73a that are inclined on the side surfaces facing each other in the direction of decreasing the distance from the front end side to the separating portion. Even when the hydraulic cylinder 51 is displaced in the left-right direction when the hydraulic cylinder 51 is retracted, the fixed plate 72 is guided by the inclined surface 73a of each guide plate 73 to be paired with the pair of guide plates 73. The support plate 78 is inserted into the separated portion. In FIG. 5A, the swinging direction Y of the hydraulic cylinder 51 is shown.
The pin hole 78 a has the same diameter as the pin insertion hole 72 a of the locking fixing pin 77 of the fixing plate 72. Further, the central axis of the pin hole 78 a, the central axis of the bearing 79, and the central axis of the locking pin hole 72 a of the fixed plate 72 are in contact with the holding member 74 at the tip surface (positioning surface) 72 b of the fixed plate 72. The position is set to be coaxial in the state of FIG. 6 (B) 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 holding member 74 is in contact with the positioning surface 74 a at the tip of the fixed plate 72, the central axis of the locking pin hole 72 a of the fixed 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 in the locked position while being coaxial with a,
The inner cable of the push-pull cable 84 is pushed forward, and the cylinder fixing pin 77 passes through the locking pin hole 72a of the fixing plate 72 as shown in FIG. In this state, the movement of the fixing plate 72 in the front-rear direction is restricted 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 unlock position, the inner cable of the push-pull cable 84 moves to the right, and as shown in FIG.
Is pulled out from the locking pin hole 72 a of the fixing plate 72. In this state, the fixed 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 storage position.

The cylinder fixing pin 77 has a stepped structure in which an axial intermediate portion 77a is smaller in diameter than the base side and the tip side. In the locked state, the intermediate portion 77 a is disposed at a position facing the locking pin hole 72 a of the fixed plate 72. Even in the locked state, the hydraulic cylinder 5
1 is in a state of being able to swing around the shaft pins 61 a and 62 a connected to the swing mechanism 60.
When the mast 131 is tilted (non-vertical posture), the hydraulic cylinder 51 swings downward, and as shown in FIG. 6C, the inner periphery of the locking pin hole 72a of the fixed plate 72. The surface comes into contact with the outer peripheral surface of the intermediate portion (small diameter portion) 77 a of the cylinder fixing pin 77.
In this state, the step portions on the left and right side surfaces of the cylinder fixing pin 77 (steps between the large diameter portion at both ends and the small diameter portion at the center) are in contact with the respective side surfaces of the fixing plate 72.
For this reason, the operation lever 81 of the operation unit 80 cannot be moved from the lock position to the unlock position. In other words, even if the lever position fixing pin 83 is pulled out and the operation lever 81 is operated from the locked position to the unlocked position, the cylinder fixing pin 77 has a stepped structure, and the movement of the fixed plate 72 is restricted. For this reason, undesired swinging is prevented when the hydraulic cylinder 51 is unlocked in a posture where the mast 131 is not vertical.

As described above, this embodiment has a structure in which the semicircular recesses 81a and 81b are provided in the contact portion between the lock positioning screw 88a and the unlock positioning screw 88b of the operation lever 81. For this reason, the operation of the operation lever 81 is not halfway, but the operation to move to a position where it abuts on the lock positioning screw 88a or the unlock positioning screw 88b can be ensured. Thereby, the cylinder fixing pin 77 is securely connected to the intermediate portion 77a.
Can move 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.
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 attaching the crawler side frame 112, the main body 111 and the turning frame 103 a are connected via a turning wheel 114. A cab 123 is attached to the turning frame 103a. Further, a mast 131 is attached to the turning frame 103a so that the mast foot 131c can be turned to an attachment portion of the turning frame 103a. The swing frame 103a is equipped with a hoisting winch 106, an upper spreader 108, a lower spreader 109, a hoisting rope 106a, and a hoisting hydraulic cylinder (not shown). Further, an auxiliary lifting device 50 including a hydraulic cylinder 51 and an auxiliary hook 52 is mounted on the mast 131.

In the auxiliary lifting device 50, the operation lever 81 of the operation unit 80 is moved to the lock position, and the movement to the unlock position is restricted by the lever position fixing pin 83. From this state, the turning frame 103a is turned 90 degrees. The mast 131 is in a vertical posture and the operation unit 8
The lever position fixing pin 83 of 0 is pulled out from the through hole 152 of the support plate 82 and the operation lever 81 is
Is moved 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 pivotally connected to the mast 131 at the shaft pins 61a and 62a.

The suspension rope 161 is hung on the crawler side frame 112, and the tip of each suspension rope 161 is slung on the auxiliary hook 52. Then, the hydraulic cylinder 51 is contracted to lift the crawler side frame 112. When the mast 131 is erected in this state, the crawler side frame 112 comes close to the main body body 111 side. The crawler side frame 112 is pulled to a predetermined position, and a crawler side frame 1 is used by using a pin or bolt (not shown).
12 is connected to the main body 111. Next, turn the turning frame 103a 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 assembled to the main body 111 using the auxiliary lifting device 50 before the lower boom 140 is attached 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 an installation site with a large area is required. On the other hand, according to the present embodiment, assembly is possible even if the site of the work site is narrow.

Next, the lower boom 140 is attached to the crane in which the crawler is assembled to the main body 111.
As shown in FIG. 8, the mast 131 is tilted forward, and a hanging tool such as a shackle and a hanging rope 162 (see FIG. 9) are attached. In addition, in order to show the magnitude | size of a crane in FIG. 8, the operator is illustrated by contrast with the magnitude | size of a crane.
Then, as shown in FIG. 9, an unillustrated stilt trailer on which the lower boom 140 is mounted is brought close to the crane 100. One end of a backstop 125 is connected to the lower boom 140. The other end of each suspension rope 162 is hooked on the lower boom 140, the hydraulic cylinder 51 is contracted, and the lower boom 140 is lifted from the high-floor trailer. The boom foot 1 of the lower boom 140 is obtained by raising and lowering the mast 131 and turning the hydraulic cylinder 51.
The position of 04a is adjusted to align with the mounting portion of the turning frame 103a. Then, a connecting pin is inserted into each connecting hole of the boom foot 104a and the swing frame 103a of the lower boom 140 to connect the lower boom 140 to the swing frame 103a so as to be raised and lowered.

Although not shown in the figure, the raised floor trailer is moved thereafter. Then, the hydraulic cylinder 51 is extended, the connecting portion 136 side of the lower boom 140 with the upper boom 141 is grounded, and the lifting tool and the hanging rope 162 are removed from the auxiliary hook 52.

Thereafter, as shown in FIG. 10, the mast 131 is erected so as to be substantially vertical. You may rotate counterclockwise a little rather than the vertical.
In this state, as shown in FIG. 5 and the like, the hydraulic cylinder 51 rotates in the clockwise direction, and the fixed plate 72 is inserted into the space between the pair of guide plates 73 and the pair of support plates 78, and the positioning surface 72b. Comes into contact with the contact surface 74 a of the holding member 74. At this time, each guide plate 73 is formed with an inclined surface 73a. 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. For this reason, even if the cylinder rod 51 b side of the hydraulic cylinder 51 is displaced in the left-right direction, the fixed plate 72 is inclined by the inclined surface 73 of the guide plate 73.
It is guided by a, and is inserted into a separation portion between the pair of guide plates 73 and the pair of support plates 78. That means
Even when working at a work site where the crane 100 is inclined in the left-right direction, the hydraulic cylinder 51 can be reliably stored.

When the fixed plate 72 is inserted into the separated portion of the pair of support plates 78 and contacts the holding member 74,
As shown in FIG. 6B, the central axes of the pin holes 78a of the pin support plate 78 and the locking pin holes 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 passes through the locking pin hole 72 a of the fixing plate 72. For this reason, the hydraulic cylinder 51 has a locking pin hole 72.
The movement in the left and right direction and the front and rear direction is restricted by a. When the operation lever 81 is moved from the unlock position to the lock position, the lever position fixing pin 83 of the operation unit 80 is inserted into the through hole 152 of the support plate 82. As a result, the operation of the operation lever 81 from the locked position to the unlocked position is restricted.

Next, as shown in FIG. 11, the mast 131 is rotated clockwise. Then, the tip of the hoisting rope 106 a 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 by its own weight. For this reason, FIG.
The fixing plate 72 is in a state where the inner peripheral surface of the locking pin hole 72 a is in contact with the outer periphery of the intermediate portion 77 a 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 the respective side surfaces of the fixing plate 72, and movement in the front-rear direction is restricted. For this reason, 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 is used.
Cannot be moved from the locked position to the unlocked position. As a result, the hydraulic cylinder 5
1 can be prevented from being released from the mast 131.

When this operation is performed, if the hydraulic cylinder 51 is not configured to be stored in the mast 131, the hydraulic cylinder 51 is counterclockwise about one end attached to the mast 131 as indicated by a dotted line. Rotate. For this reason, the hydraulic cylinder 51 interferes with the lower boom 140. Such a state can be avoided by adopting a structure in which the hydraulic cylinder 51 can be stored in the mast 131 as in this embodiment.

Thereafter, 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 transported, and the lower boom 140 and the upper boom 141 are connected by the connecting portion 136.
(2) The hoisting winch 105 is driven to feed the hoisting rope 105a and the sheaves 121, 1
22 and hook 110 are wound. Then, the hoisting rope 105a is wound up to hook 11
Pull up zero.
(3) The hoisting winch 106 is driven to wind up the hoisting rope 106a to raise the boom 104.
Thereby, the crane 100 can be assembled as shown in FIG.
In order to disassemble the crane 100, the procedure may be reversed.

According to one embodiment of the present invention, the following effects can be obtained.
(1) The auxiliary lifting device 50 is inserted / extracted by the pin driving device, and when inserted into the locking pin hole 72a of the fixing plate 72, the auxiliary lifting device 50 is fixed to the mast 131 and is extracted from the locking pin hole 72a. Then, a stepped cylinder fixing pin 77 is provided to make the auxiliary lifting device 50 releasable from the mast 131. For this reason, even if the mast 131 is inclined forward, the fixing plate 72 fixed to the hydraulic cylinder 51 has the locking pin hole 7.
The inner peripheral surface of 2a comes into contact with the step portion of the cylinder fixing pin 77. Thereby, 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 that operates the push-pull cable 84. The operation unit 80 includes an operation lever 81 that is operated in a locked position and an unlock position, A lever position fixing pin 83 is provided on a path between the lock position where the operation lever 81 moves and the unlocking position, and is a blocking member that prevents the operation lever 81 from moving. For this reason, when the lever position fixing pin 83 is attached, the operation lever 81 cannot be switched between the locked position and the unlocked position. For this reason, the hydraulic cylinder 51
It is possible to improve the reliability of ensuring the storage state.

(3) The operation unit 80 is provided on the mast foot 131 c side of the mast 131, and the cylinder fixing pin 77 is provided in an intermediate portion in the longitudinal direction of the mast 131. For this reason, mast 13
1 can be remotely operated to switch 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 is further provided. The guide plates 73 are arranged so as to form a separation portion through which the fixed plate 72 is inserted.
The side surface facing the fixed plate 72 is an inclined surface for guiding the movement of the fixed plate 72 to the lock position. For this reason, even if the cylinder rod 51 b side of the hydraulic cylinder 51 is displaced in the left-right direction, the fixed plate 72 is guided by the inclined surface 73 a of the guide plate 73 and is inserted into the separating portion of the pair of support plates 78. Thereby, even when the mast 131 in the vertical posture works at a work site where the crane 100 is inclined in the left-right direction, the hydraulic cylinder 51 can be reliably stored.

It can also be described 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 the cylinder tube 51a is swingably connected to the mast 131, and a hook 52 is attached to the tip of the cylinder rod 51b. The auxiliary lifting device 50 includes a fixing plate 72 provided on the other end side of the cylinder tube 51 a and having a pin insertion hole 72 a into which the fixing pin 77 is inserted, and both ends 77 b of the fixing pin 77 provided on the mast 131. And 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 72 a and the pin support hole 78 a to fix the auxiliary lifting device 50 to the mast 131. The fixing pin 77 has a pair of support portions 7 provided at both ends thereof.
8 and a small-diameter portion 77a provided at the center of the fixing pin 77 and having a diameter smaller than that of the large-diameter portion 77b.
When the mast 131 is in a non-vertical posture, the auxiliary lifting device 50 swings slightly and tries to assume a 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 to be pulled out in this state, the stepped surfaces of the pin small diameter portion 77a and the large diameter portion 77b are not fixed to the fixing plate 72.
The fixing pin 77 is difficult to remove.
Instead of the pair of support plates 78 that support both ends of the fixing pin 77, an integral structure support portion having a pin support hole 78a and a pair of opposing support walls may be used. Good. Moreover, it can replace with the fixing plate 72 which has the pin insertion hole 72a, and can use the fixing part of the various form which has the pin insertion hole 72a.

(6) In the auxiliary lifting device 50 described in (5) above, the fixing plate 72 is positioned on the positioning surface 72b.
(FIG. 4). The auxiliary lifting device 50 includes a holding member 74 provided on the mast 131 side. The holding member 74 has an abutment surface 74 a against which the positioning surface 72 b of the fixing plate 72 abuts when the hydraulic cylinder 51 is fixed to the mast 131 by the fixing pin 77. Mast 131
Is in a vertical posture, the hydraulic cylinder 51 is also in a substantially vertical posture. In this state, when the positioning surface 72b of the fixed plate 72 contacts the contact surface 74a of the holding member 74, the pin insertion hole 72a of the fixed plate 72 and the pin support holes 78a of the pair of pin support portions 78 are coaxial. Be placed.
Therefore, the fixing pin 77 can be easily inserted and removed.

The crane including the auxiliary lifting device according to the embodiment described above includes a work machine main body, a hoisting winch 106 that adjusts the hoisting 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. And the auxiliary lifting device 50 described in the above (5) to (8).
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 embodiment described above, the auxiliary lifting device is described as being mounted on the crane 100. However, the auxiliary lifting device of the present invention can be mounted not only on a crane but also on a civil engineering, a variety of foundation machines and construction machines for construction with a mast that rises and falls.

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

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

In the structure described in the above-mentioned prior document, the hydraulic cylinder type auxiliary lifting device is a structure in which the cylinder rod is fixed by inserting a cylindrical lock pin so as to straddle the concave portion of the locking plate and the fixing plate. The Then, an object of this invention is to provide the structure which makes easy connection with a fixing | fixed part and a raising / lowering member.

According to one aspect of the present invention, an auxiliary lifting device attached to a hoisting member that hoists up and down with respect to a work machine includes a hoisting member whose one end is swingably connected to the hoisting member, and the other end of the hoisting member A fixing portion provided on the side, and a fixing surface that contacts the fixing portion when the undulating member undulates, and is provided on the undulating member and contacts the abutting surface; And a support portion that can be connected.
According to another aspect of the present invention, the cylinder whose one end side is swingably connected to the undulating member that undulates with respect to the work machine has a fixing portion connected to the undulating member on the other end side, and the fixing The portion has a positioning surface that protrudes outward in the radial direction of the cylinder from a connection position with the undulation member, and a positioning surface that comes into contact with the undulation member in a state where the fixing portion can be connected to the undulation member. It is characterized by.

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.

Claims (5)

In an auxiliary lifting device having a hydraulic cylinder in which one end of a cylinder tube is swingably connected to a mast and a hook is attached to the tip of a cylinder rod,
A fixing portion provided on the other end side of the cylinder tube and having a pin insertion hole into which a fixing pin is inserted;
A pin support portion provided on the mast and having a pin support hole for supporting the fixing pin;
The fixing pins that are inserted into the pin insertion holes and the pin support holes to fix the hydraulic cylinder to the mast have large diameter portions that are provided at both ends and are supported by the pin support portions, and An auxiliary lifting device having a small-diameter portion having a diameter smaller than that of the large-diameter portion provided in the center. The auxiliary lifting device according to claim 1,
The fixed portion has a positioning surface;
The mast contacts the positioning surface when the hydraulic cylinder is fixed to the mast by the fixing pin, and the pin insertion hole of the fixing portion and the pin support hole of the pin supporting portion are coaxial. An auxiliary lifting device characterized by having an abutment surface disposed on the surface. The auxiliary lifting device according to claim 2,
In a state where the hydraulic cylinder is fixed to the mast by the fixing pin, when a force to swing the hydraulic cylinder is applied by gravity, the pin insertion hole of the fixing portion is supported by the small diameter portion. An auxiliary lifting device characterized by that. The auxiliary lifting device according to claim 3,
A pin driving device for inserting and removing the fixing pin with respect to the pin insertion hole of the fixing portion and the pin supporting hole of the pin supporting portion;
The pin driving device includes an operation lever that swings between an insertion operation position of the fixing pin and an extraction operation position of the fixing pin,
When the hydraulic cylinder is fixed to the mast by the fixing pin, and the pin insertion hole of the fixing portion is supported by the small diameter portion, the operation lever is operated from the insertion operation position to the extraction operation position. The auxiliary lifting device according to claim 1, wherein when a pulling force is applied to the fixing pin, a step surface between the small diameter portion and the large diameter portion is regulated by a side surface of the fixing portion. A work machine body;
A hoisting device for adjusting the hoisting angle of the boom by tilting a mast provided in the work machine body;
A work machine comprising the auxiliary lifting device according to any one of claims 1 to 4, which is swingably connected to a boom side of the mast.