JPH10167675A - Counterweight moving mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shift a counterweight in a state of being stabilized in an interval between a storage position on a car body and rear position of a revolving superstructure by shifting this counterweight mounted on the storage position horizontally, up to a lifting position as converting it into verticality. SOLUTION: A counterweight shifting mechanism 1 shifts from a state of being stored in the rear part of a revolving superstructure 10 at a time when one hydraulic cylinder 28 is merely contracted from the specified extension, and then it lifts up a counterweight 50 in horizontality, mounted in a storage position P on a car body 12 shifting it to the specified position at the rear of the revolving superstructure 10, and thus it is able to convert the horizontality into verticality. In brief, this counterweight shifting mechanism 1, at one-side process alone of a rod 28a of the hydraulic cylinder 28, shifts the counterweight 50 as rotating the position as far as nearly 90 degrees in space between a working position at the rear of the revolving superstructure 10 and the storage position P on the car body 12, and further, this shifting mechanism itself is stored in the specified position at the rear of the revolving superstructure 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a counterweight moving mechanism for moving a counterweight provided in a self-propelled crane such as a truck crane.

[0002]

2. Description of the Related Art Generally, a self-propelled crane such as a truck crane has a revolving body provided with a crane device such as a boom mounted on a traveling vehicle body so as to be capable of turning. In such a self-propelled crane, a counterweight is generally attached to the rear portion of the revolving structure in order to balance the vehicle body during crane operation and increase the lifting capacity of the crane.

[0003] In particular, in the case of a relatively large self-propelled crane, the weight of the counterweight can be changed according to the lifting capacity required for the crane operation. The counterweight can be moved from the rear of the revolving structure in order to clear the vehicle restrictions on the load and the like.

Various types of moving mechanisms for moving the counterweight have been conventionally proposed. One example is shown in FIGS. The counterweight moving mechanism (Japanese Utility Model Publication No. 49-5649) shown in FIG.
02, a bracket 108 protruding from a rear portion of the revolving body 103 rotatably mounted thereon and rotatably supporting the counterweight 119, and a guide pulley 118 provided on the counterweight 119 while being wound or fed out by a winch 117. Wire 107 wrapped around
And a guide member 111 whose one end is pivotally connected to a portion 112 of the counterweight 119 and whose sliding is regulated by a lock pin 113. In this configuration,
With the lock pin 113 pulled out and the guide member 111 slidable, the wire 10 is
7, the counterweight 119 is rotated outward by approximately 90 degrees from a storage position (when the vehicle is running) indicated by a solid line in the figure to a work position (during crane operation) indicated by a two-dot chain line in the figure.

The counterweight moving mechanism shown in FIG. 8 (Japanese Utility Model Publication No. 52-37412) operates in accordance with the extension and retraction of the boom 205 and is detachably attached to the first or second mounting portion 215, 216 of the counterweight 210. A wire 220 to be attached; a counterweight attachment portion 211 provided at the rear of the revolving body 206;
Guide moving surface 22 provided on vehicle body 201 for receiving
2 and a fixed base 221 having a bearing surface 223. In this configuration, the counter weight 210
At the time of a predetermined crane operation, as shown in FIG. 8A, the work is positioned at a work position engaged with the counterweight mounting portion 211 at the rear portion of the revolving body 206. When the counterweight 210 is stored on the vehicle body 201 for running the vehicle, the fixing means 212 is first released, and the wire 220 is moved to the second position located outside the counterweight 210.
In this state, the boom 205 is extended and the counterweight 210 is lifted. At this time, the counterweight 210 is inclined by the movement of the center of gravity, and is completely separated from the counterweight mounting portion 211. In this state, when the boom 205 is contracted, the counterweight 210
Descends without interfering with the counterweight mounting portion 211, abuts on the guide moving surface 222 of the fixed base 221, moves along the guide moving surface 222, and reverses at the end of the guide moving surface 222 to be inverted. 223 is placed in a lying state (see FIG. 8B).

The counterweight moving mechanism shown in FIG. 9 (Japanese Patent Publication No. 3-75478) has links 311 and 312 rotatably mounted on the revolving unit 302 and engageable with the counterweight 303, and these links 311 and 312. And a hydraulic cylinder 315 for operating the 312. In this configuration, as shown in FIG.
When the links 311 and 312 are operated by the hydraulic cylinder 315 in a state where 03 is mounted on the vehicle body 301,
As shown in FIG. 9B, the links 311 and 312 are engaged with the counter weight 303, and the counter weight 3
03 is moved upward with the posture as it is, and positioned at the rear of the revolving superstructure 302.

[0007]

The counterweight moving mechanism shown in FIG.
The counterweight 119 is stored in a vertical state in which it is raised vertically, and the counterweight 119 is rotated outward during work so as to be in a horizontal protruding state in which the counterweight 119 is laid horizontally. Therefore, when stored, the position of the center of gravity of the counterweight 119 becomes high, and depending on the weight of the counterweight 119, there is a possibility that stability of the vehicle body during traveling cannot be ensured. Further, at the time of work, since the counterweight 119 protrudes greatly from the rear portion of the revolving structure 103, there is a possibility that the counterweight 119 will interfere with surrounding obstacles when the revolving structure 103 is turned during the operation. Further, since the operator has to manually pull out the lock pin 113 to enable the slide of the guide member 111 in order to operate the counter weight moving mechanism, the movement of the counter weight 119 requires labor, and the counter weight 119 needs to be moved. There is a problem that the moving work cannot be performed quickly.

On the other hand, the counterweight moving mechanism shown in FIG. 8 stores the counterweight 210 in a horizontal state on the vehicle body, and sets the counterweight 210 in a vertical state in which the counterweight 210 is raised vertically during work. Therefore, when stored, the position of the center of gravity of the counterweight 210 is lowered, and the stability of the vehicle body during traveling is ensured. At the time of work, the counterweight 210 does not protrude significantly from the rear portion of the revolving body 206, so that the Interference with objects can be prevented. However, in order to move the counterweight 210, the operator must attach the wire 220 to the counterweight 210 and release the locking means 212 manually. Therefore, the counter weight 210
There is a problem that the moving of the counterweight requires labor and the work of moving the counterweight 210 cannot be performed quickly. In addition, since the counterweight 210 is moved only by the wire 220, the movement is unstable.
The vehicle body 201 receives a more or less impact because the vehicle 10 is caused to collide with the fixed base 221 and lie horizontally.

On the other hand, in the counterweight moving mechanism shown in FIG. 9, the counterweight 303 is moved by the links 311 and 312 simply by operating the hydraulic cylinder 315, so that the counterweight 303 can be moved quickly. be able to. However, the revolving superstructure 30
2 is placed and stored on the vehicle body 301 in the posture as it is without lying down sideways, and if the size of the counter weight 303 in the height direction is large, the counter weight 303 is stored at the time of storage. There is a possibility that the weight 303 and another component such as a boom located above the vehicle body 301 may interfere with each other.

The present invention has been made in view of the above circumstances, and an object of the present invention is to easily and quickly and stably set a counter weight between a storage position on a vehicle body and a rear position of a revolving structure. In addition to being able to move in the state, the counterweight can be stored so that stability during running of the vehicle is not impaired, and the counterweight is stored in the storage position and revolving structure so that the counterweight does not interfere with other obstacles It is an object of the present invention to provide a counter weight moving mechanism that can be positioned at the rear position.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a self-propelled crane having a predetermined storage position on a traveling vehicle body and a revolving body pivotally mounted on the vehicle body. In the counter weight moving mechanism for moving the counter weight between the side lifting position,
A first link having one end rotatably connected to a first fulcrum of the revolving structure, one end rotatably connected to the other end of the first link, and the other end placed in the storage position; A second link detachably and rotatably connected to the first mounting portion of the counterweight, one hydraulic cylinder for rotating the first link about the first fulcrum, and one end of the hydraulic cylinder for the revolving body. A third link rotatably connected to the second fulcrum and having the other end detachably and rotatably attached to the second attachment portion of the counterweight; and a first link and a third link having both ends thereof. And a fourth link that is rotatably connected to the first link and a third link that operates integrally with the first link. Couns placed in state Wherein the moving to a lifting while converting the vertical state position weight.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows a self-propelled crane in which a revolving unit 10 is pivotally mounted on a traveling vehicle body 12, and a rear side of the revolving unit 10 is directed toward a storage position P on the vehicle body 12 where a counterweight 50 is stored. FIG. As shown in the drawing, the counterweight 50 is placed on the vehicle body 12 at the storage position P in a horizontally laid state.

A counter weight moving mechanism 1 according to one embodiment of the present invention is attached to a rear portion of the revolving superstructure 10. The counterweight moving mechanism 1 includes a plurality of links 20.
And a hydraulic cylinder 28 which operates these links 20 to 27 by the expansion and contraction of a rod 28a.
The links 20 to 27 are provided on both the left and right sides of the revolving structure 10, respectively.
Only 0-27 are shown. In the figure, reference numeral 60 denotes a winch drum attached to the rear upper end of the swing body 10. Also, in order to prevent the counter weight moving mechanism 1 held by the hydraulic cylinder 28 from being distorted by oil leakage or the like, for example, one of the links 20 to 27 is attached to a portion of the revolving body 10 near the winch drum 60. There is provided a support mechanism 40 that engages with the support mechanism to assist the posture of the counterweight moving mechanism 1 in an auxiliary manner.

As shown in detail in FIG. 2, the lowermost first link 20 constituting the counterweight moving mechanism 1 is provided.
Is rotatably attached at one end to a rear portion of the revolving body 10 via a support shaft 30. The other end of the first link 20 is detachably attached to a counter weight 50 placed at the storage position P. Specifically, the engagement shaft portion 80 provided at the other end of the first link 20
Is a counterweight 50 placed horizontally at the storage position P.
Are rotatably (and freely disengageable) engaged with the engaging groove 51. Needless to say, the same applies to the first link 20 located on the opposite side to the revolving unit 10.

One end of the second link 22 located above the first link 20 is attached to the rear end of the revolving unit 10 by a support shaft 31.
It is rotatably mounted via a. The second link 22 is connected to the first link 2 via the third link 21.
0 and operates integrally with the first link 20. In this case, one end of the third link 21 is rotatably attached to the shaft 35 of the second link 22, and the other end of the third link 21 is connected to the first link via the support shaft 34.
Is rotatably attached to the link 20.

A fourth link 23 is slidably inserted into the second link 22. A notch 62 is formed at one end of the fourth link 23 located in the second link 22, and the notch 62 extends substantially perpendicular to the longitudinal direction of the second link 22. It engages with the shaft 35 in a detachable manner. On the other hand, the other end (free end) of the second link 22 has a notch 6
1 is formed, and at the portion of the fourth link 23 projecting from the free end of the second link 22, a projection 60 that can be engaged with the notch 61 is provided to protrude to the side. in this case,
The protrusion 60 engages with the notch 61 at a position where the notch 62 and the shaft 35 engage. Therefore, when the notch 62 engages with the shaft portion 35 and, accordingly, the protrusion 60 and the notch 61 engage, the sliding of the fourth link 23 into the second link 22 is restricted. .

The other end of the fourth link 23 projecting from the free end of the second link 22 has a fifth link 24
Are rotatably mounted via a support shaft 36. Further, the end of the fifth link 24 is formed as a hook 24a that can removably engage with the engaging projection 52 of the counterweight 50 placed horizontally at the storage position P.
Needless to say, the same applies to the fifth link 24 located on the opposite side to the revolving unit 10.

Fifth link 2 to fourth link 23
The second link 22 and the second link 22 are moved so that the rotation angle of the fourth link 23, that is, the inclination angle of the fifth link 24 (hook portion 24a) with respect to the axis of the fourth link 23 changes as the fourth link 23 slides. The five links 24 are connected by a wire rope 64. That is, the wire rope 64 is
One end is fixed to the wire fixing portion 65 of the fifth link 24, and the other end is passed over a guide pulley 79 attached to the support shaft 36, and then passes through the inside of the fourth link 23 to form the second link 22. Is fixed to the wire mounting portion 63 fixed to the wire.

In this case, the wire rope 64 has the structure shown in FIG. 2 where the fourth link 23 is most retracted into the second link 22.
In this state, the length of the hook portion 24a is set such that the hook portion 24a rotates at least to an angle at which the hook portion 24a can engage with the engaging protrusion 52 of the counterweight 50. In this configuration, the wire rope 64 can prevent the fourth link 23 from sliding in the projecting direction to prevent the fourth link 23 from falling off from the second link 22.

An opening 7 is provided on the upper surface of the second link 22.
0 is formed over a predetermined length.
From the enlarged part 77 provided in the middle of the fourth link 23
Is protruding. Further, one end of the sixth link 25 is rotatably connected to the expanded portion 77 via a support shaft 37. One end of the sixth link 25 connected to the enlarged portion 77 is formed, for example, as a fan-shaped locking body 25b that smoothly curves upward, and the lower surface of the locking body 25b is formed as a smooth tapered surface 73. Is formed. At the end of the tapered surface 73, that is, at the lower edge of the locking body 25b, a hook 72 is provided to protrude downward.

A locking member 66 is fixed to the inner surface of the second link 22. The locking member 66 has a guide surface 66a that guides the tapered surface 73 of the locking body 25b that moves with the sliding of the fourth link 23, and a portion near the end of the sliding of the fourth link 23 in the projecting direction. Guide surface 6
It has a meshing portion 66b that can mesh with the hooking portion 72 of the locking body 25b guided by 6a. The hook 7 near the end of the slide of the fourth link 23
The engagement of the second link 2 with the engagement portion 66b is performed at a stage where the sixth link 25 forms a predetermined angle with the fourth link 23, and the sixth link 25 further rotates from the angle to form the fourth link 25. For example, the link 23 is released at a stage where the angle is 90 degrees (a stage where the angle exceeds 90 degrees).

On the other hand, the other end of the sixth link 25 is rotatably connected to an end of a telescopic rod 28a of the hydraulic cylinder 28 via a support shaft 38. In this case, the hydraulic cylinder 28 is rotatably connected to a rear portion of the revolving structure 10 via a support shaft 32, and has a so-called trunnion type cylinder.

The sixth link 25 has an extension 25a extending to the other end thereof in an L-shape over a predetermined length.
have. Then, when the sixth link 25 is lifted in a predetermined rotation state by the extension operation of the rod 28a as described later (see FIG. 6), the revolving body 10 in which the extension 25a is located near the winch drum 60, for example, is provided. And the fourth link 23 is forcibly slid into the second link 22 by the pressing force.

One end of the seventh link 26 is rotatably connected to the support shaft 38. One end of an eighth link 27 is rotatably connected to the other end of the seventh link 26 via a support shaft 39. The other end of the eighth link 27 is rotatably connected to a rear portion of the revolving structure 10 via a support shaft 33.

On the other hand, when the hook portion 24a of the fifth link 24 is engaged with the engagement projection 52 of the counterweight 50, the engagement between the engagement shaft portion 80 of the first link 20 and the counterweight 50 is established. A holding mechanism 95 that holds a rotatable engagement state with the mating groove 51 is provided.

The holding mechanism 95 includes a counterweight 5
The first link unit 90 is rotatably attached to the first link unit 90. The first link portion 90 has a stopper 90a that engages with the engagement shaft portion 80 that has fallen into the engagement groove 51 to prevent the engagement shaft portion 80 from coming out of the engagement groove 51. The first link portion 90 is constantly pulled by a spring 92 attached to the counterweight 50 in a direction in which the engagement state between the stopper 90a and the engagement shaft portion 80 is released. Further, the holding mechanism 95 is provided with the counterweight 50.
A second link 93, which is rotatably mounted on and is pressed by the hook 24a engaged with the engaging projection 52, and rotates, and a first link 90 and a second link 93.
A third link portion 9 whose both ends are rotatably connected
And 1.

Therefore, when the hook portion 24a of the fifth link 24 engages with the engaging projection 52 of the counterweight 50, the second link portion 93 is pushed and rotated by the hook portion 24a, whereby The third link portion 91 rotates the first link portion 90 against the urging force of the spring 92, and the stopper 90a of the first link portion 90
Engages with the engagement shaft portion 80 that has fallen. Thus, the engagement shaft portion 80 is prevented from coming off from the engagement groove 51, and the rotatable engagement state between the engagement shaft portion 80 and the engagement groove 51 is maintained.

Conversely, when the hook portion 24a comes off the engaging projection 52 of the counterweight 50, the first link portion 90 is pulled by the restoring force of the spring 92, and the stopper 90a and the engaging shaft portion 80 are pulled. Is released. Therefore, if the first link 20 is pulled upward in this state, the engagement shaft portion 80 is separated from the engagement groove 51.

A support mechanism 40 for supporting the posture of the counterweight moving mechanism 1 held by the hydraulic cylinder 28 in an auxiliary manner is provided with an arm 42 rotatably mounted on the revolving unit 10 via a support shaft 89, The air cylinder 41 is rotatably attached to a bracket 87 provided on the revolving body 10. At the end of the arm 42, a stopper rod 42a extending to the side of the arm 42 is provided. The stopper rod 42a can engage with the notch 78 at the free end of the fourth link 23 (see FIGS. 3 and 6) lifted to a predetermined height by the expansion and contraction operation of the rod 28. The arm 42 is urged by a spring (not shown) in a direction in which the stopper rod 42a and the notch 78 of the fourth link 23 engage. The telescopic rod of the air cylinder 41 is fixed to the arm 42 so that the engagement between the notch 78 of the fourth link 23 and the stopper rod 42a can be released by the extension operation. That is, the air cylinder 41 extends the telescopic rod, thereby rotating the arm 42 against the urging force of the spring, and engaging the notch 78 of the fourth link 23 with the stopper rod 42a. The state can be canceled.

Next, the operation of the above-configured counter weight moving mechanism 1 will be described. The relationship between the lengths of the links 20 to 27 constituting the counterweight moving mechanism 1 and the positions of the engagement grooves 51 and the engagement projections 52 in the counterweight 50 are such that the operations described below can be reliably achieved. Is set to

FIG. 2 shows the rod 28a of the hydraulic cylinder 28.
Indicates a state in which it is extended by a predetermined length. At this time, the fourth link 23 receives a force from the rod 28a via the sixth link 25 which is aligned with the rod 28a,
The most retracted state is in the second link 22. That is, the notch 62 of the fourth link 23 engages with the shaft 35 of the second link 22, and the protrusion 60 of the fourth link 23 engages with the notch 61 of the second link 22. doing. Accordingly, the hook portion 24a of the fifth link 24 is completely engaged with the engagement projection 52 of the counterweight 50 horizontally positioned at the storage position P on the vehicle body 12, and The engagement shaft portion 80 of the link 20 is also engaged with the engagement groove 51 of the counterweight 50. On the other hand, the holding mechanism 95 operated by the hook portion 24a
The stopper 90a of the first link portion 90 is
0, and the rotatable engagement state between the engagement shaft portion 80 and the engagement groove 51 is maintained. Further, in this state, the seventh
The link 26 and the eighth link 27 are bent at an angle to each other and open downward in a "-" shape.

When the rod 28a of the hydraulic cylinder 28 is contracted from the state shown in FIG. 2, the seventh and eighth links 26 and 27 are folded, and the sixth link 25 moves straight with the rod 28a. It rises while keeping it. Accordingly, the fourth link 23 is lifted, the second link 22 and the fifth link 24 engaged with the fourth link 23 are raised, and the second link 22 and the fifth link 24 are connected via the third link 21. The first link 20 connected to the link 22 is also raised. Therefore, the counterweight 50 is lifted upward while being supported at two points by the second link 20 and the hook portion 24a.

At this time, the fifth link 24 is connected to the fourth link 24.
The link 23 rotates with respect to the fourth link 23 as the link 23 rises, and gradually rises in the vertical direction while rotating the counterweight 50 about the engagement shaft 80.
In this case, the first link depends on the connection state of the third link 21 to the first and second links 20 and 22, that is, by the action of the four-node link having the support shafts 30, 31, 34 and 35 as four fulcrums. Link 20 and second link 22
And the counterweight 50
Is converted, for example, into a vertically raised state in the most contracted state of the rod 28a shown in FIG. 3, and is lifted to the lifting position Q.

That is, the counterweight moving mechanism 1
Is to make a difference between the rotation amounts of the first link 20 and the second link 22 that rotate integrally by the operation of the hydraulic cylinder 28, and to adjust (correct) the difference in the rotation amount by the rotation of the fifth link 24. By doing so, the counterweight 50 can be easily converted from a horizontal state (the state shown in FIG. 2) to a vertical state (the state shown in FIG. 3) and can be moved from the storage position P to the lifting position Q.

In the state shown in FIG. 3, if the extension / retraction operation of the rod 28 is fixed, the triangle having the vertexes of the support shafts 31, 37, 38 (32) forms a fixed chain. 1 is maintained. Therefore, the counterweight 50 can be held in the vertical position at the lifting position Q. Further, the air cylinder 41 is expanded and contracted so that the stopper rod 42 a is engaged with the notch 78 of the fourth link 23 so that the posture of the counterweight moving mechanism 1 is not lost due to expansion and contraction or leakage of oil in the hydraulic cylinder 28. By doing so, the vertically suspended state of the counterweight 50 is reliably maintained.

Next, when the rod 28a is extended from the state shown in FIG. 3, the counterweight moving mechanism 1 is brought into the state shown in FIG. In this case, due to the movement of the center of gravity, the counterweight 50 itself is rotated about the engagement shaft portion 80 while being supported by the hook portion 24a, and is placed horizontally at the storage position P.

In the state shown in FIG. 2, the counterweight 50 is placed at the storage position P, whereby the links 20 and 2 are connected.
Since the downward rotation of the second link 2 is restricted, when the rod 28a is further extended from this state, as shown in FIG.
3 starts to slide so as to protrude from the second link 22. As a result, the engagement between the hook portion 24a and the engagement protrusion 52 is released (therefore, the engagement between the engagement shaft portion 80 and the stopper 90a of the holding mechanism 95 is also released), and almost the same. At the same time, as shown in FIG.
And the seventh link 26 and the eighth link 27 are aligned with each other. At this time, the engaging portion 72 of the locking member 25b guided along the guide surface 66a of the locking member 66 is engaged with the engaging portion 66b of the locking member 66.
Move to the position corresponding to.

When the rod 28a is further extended in a state where the seventh link 26 and the eighth link 27 are in a straight line, a triangle having the vertices 32, 33, 38 as vertices starts to rise. Accordingly, the sixth link 25 is lifted. At this time, the sixth link 25 is connected to the lower link 20 supported by the sixth link 25,
Due to the weights of 21, 22, 23, and 24, they start to rotate clockwise around the support shaft 37 in the figure. As a result, the hook portion 72 engages with the meshing portion 66b. Therefore, the slide of the fourth link 23 into the second link 22 is restricted,
Accordingly, the rotation state of the hook portion 24a separated upward from the engagement protrusion 52 is maintained, and the hook 24a and the engagement protrusion 52 are prevented from engaging again.

That is, when the rod 28a is extended in a state where the seventh link 26 and the eighth link 27 are in a straight line, the sixth link 25 keeps the counterweight 50 in the storage position P. The lower links 20, 21, 22, 23, and 24 suspended from this will rise.

Thereafter, the sixth link 25 is connected to the rod 28
a, while being raised by the extension of a, the weight of the links 20, 21, 22, 23, 24 hung downward,
Continue to rotate clockwise around 7, but link 6
The engagement between the hook portion 72 and the meshing portion 66b is released when, for example, the 5 has rotated 90 degrees with respect to the fourth link 23. Therefore, the slide of the fourth link 23 into the second link 22 becomes possible.

Further, when the rod 28a extends, the sixth
The link 25 of the sixth link 25 is lifted by lifting the lower links 20, 21, 22, 23, and 24 while continuing to rotate, but the extension 25a of the sixth link 25 is located near the winch drum 60. When the fourth link 23 comes into contact with a predetermined portion 88 of the revolving structure 10 by the pressing force,
Is forcibly slid into the link 22 to the end. FIG. 6 shows this state, in which the counterweight moving mechanism 1 is stored compactly at the rear of the revolving superstructure 10. In this state, if the expansion and contraction operation of the rod 28 is fixed, the support shafts 32 and 3 are fixed.
Since the triangles having the vertices of 3 and 38 form a fixed chain, the attitude of the counterweight moving mechanism 1 is maintained.
At this time, if the air cylinder 41 is expanded and contracted to engage the stopper rod 42a with the notch 78 of the fourth link 23, the counterweight moving mechanism 1 is securely held at this storage position. Further, since the wire rope 64 is loosened by sliding the fourth link 23 into the second link 22, the hook portion 24a is in a state of hanging downward.

Of course, if the rod 28a is contracted from the state shown in FIG. 6, the links 20 to 27 follow the reverse operation to the above-mentioned operation, that is, through the states shown in FIGS. 5 and 4,
In the state of FIG. 2, the canta weight 5 at the storage position P is set.
It can be moved vertically again to the rear part of the revolving superstructure 10 by grasping 0 (see FIG. 3).

In the present embodiment, for example, the bottom surface of the counterweight 50 and the support surface of the vehicle body 12 may be engaged with each other in an uneven manner, and the counterweight 50 may be positioned at the storage position P. Further, the boom may be stably held at the storage position by engaging the counterweight 50 and the boom with the concave and convex. That is, the counterweight 50 is used as a boom rest, and the counterweight 5 is controlled by the vehicle body 12 and the boom.
You may make it fix the counterweight 50 so that 0 may be inserted.

As described above, the counterweight moving mechanism 1 of the present embodiment moves the hydraulic cylinder 28 from the state stored in the rear part of the revolving unit 10 simply by contracting one hydraulic cylinder 28 from a predetermined extended state. Then, the horizontal counterweight 50 placed at the storage position P on the vehicle body 12 is lifted, and the lifted counterweight 50 is moved to a predetermined position at the rear portion of the revolving structure 10 to be in a vertical state. That is, the counterweight moving mechanism 1 moves the counterweight 50 between the working position at the rear part of the revolving unit 10 and the storage position P on the vehicle body 12 by only one stroke of the rod 28a of the hydraulic cylinder 28. The rotating body 10 is moved while being rotated by 90 degrees, and is itself stored in a predetermined position at the rear part of the revolving structure 10. Therefore, the counterweight 50 can be moved easily, quickly and in a stable state with a compact configuration and operation.

Further, since the counterweight moving mechanism 1 of the present embodiment can store the counterweight 50 on the vehicle body 12 in a horizontal and horizontal state, the center of gravity of the counterweight 50 is lowered when the vehicle body 12 is running. In addition to ensuring the stability of the counterweight 50, even when the size of the counterweight 50 in the height direction is large, interference between the counterweight 50 and other components such as a boom located above the vehicle body 12 can be prevented.

Further, the counterweight moving mechanism 1 of the present embodiment can position the counterweight 50 at the rear portion of the revolving structure 10 in a vertically-oriented state in which the counterweight 50 is raised vertically. It is not necessary to protrude greatly from. Therefore, interference between the counterweight 50 and the obstacle can be prevented.

[0047]

As described above, according to the counterweight moving mechanism of the present invention, the counterweight can be moved easily, quickly and stably between the storage position on the vehicle body and the rear position of the revolving structure. The counter weight can be stored so that stability during running of the vehicle body is not impaired, and the counter weight is stored at the storage position and the rear position of the revolving structure so that the counter weight does not interfere with other obstacles. And can be located at

[Brief description of the drawings]

FIG. 1 is a side view showing an entire counterweight moving mechanism according to an embodiment of the present invention.

FIG. 2 is a side view showing a state in which a link of the counterweight moving mechanism of FIG. 1 is engaged with a counterweight in a horizontal state.

FIG. 3 is a side view showing a state where the counterweight is vertically positioned at the rear part of the revolving structure by the counterweight moving mechanism of FIG. 1;

FIG. 4 is a side view showing a state in which the engagement state between the link of the counter weight moving mechanism of FIG. 1 and the counter weight in the horizontal state is released.

FIG. 5 is a side view showing a state in which the counterweight moving mechanism, in which the engagement state with the horizontal counterweight is released, is lifted.

FIG. 6 is a side view showing a state where the counterweight moving mechanism of FIG. 1 is stored in a rear portion of the revolving superstructure.

FIG. 7 is a diagram showing a first example of a conventional counterweight moving mechanism.

FIG. 8 is a diagram showing a second example of a conventional counterweight moving mechanism.

FIG. 9 is a diagram showing a third example of a conventional counterweight moving mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Counter weight moving mechanism 20-27 ... Link 28 ... Hydraulic cylinder 50 ... Counter weight

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[Procedure amendment]

[Submission date] January 27, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction contents]

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a self-propelled crane having a predetermined storage position on a traveling vehicle body and a revolving body pivotally mounted on the vehicle body. In the counter weight moving mechanism for moving the counter weight between the side lifting position,
One end thereof is rotatably connected to a first fulcrum of the revolving body,
The other end is detachable from the first mounting part of the counterweight
And a first link rotatably attached to one that
A second end rotatably connected to a second fulcrum of the revolving superstructure;
And links to rotate the second link about a second pivot point
One hydraulic cylinder and both ends of the
2 links are rotatably connected to the first link, respectively.
Link for operating the link integrally with the second link
And one end thereof is rotatably connected to the other end of the second link.
Counter weight with the other end placed in the storage position
The second mounting portion is detachably and rotatably connected to the second mounting portion.
4 wherein the counterweight placed horizontally in the storage position is moved to the lifting position while converting the counterweight placed horizontally in the storage position to the vertical position by the operation of each link accompanying the expansion and contraction operation of the hydraulic cylinder. Features.

Claims (2)

[Claims] 1. A counterweight for moving a counterweight between a predetermined storage position on a traveling vehicle body of a self-propelled crane and a lifting position on a rear side of a revolving body pivotally mounted on the vehicle body. A counterweight moving mechanism, one end of which is rotatably connected to a first fulcrum of the revolving body; and one end of which is rotatably connected to the other end of the first link.
A second link removably and rotatably connected to the first mounting portion of the counterweight whose other end is placed in the storage position; and one for rotating the first link about the first fulcrum. A hydraulic cylinder, one end of which is rotatably connected to a second fulcrum of the revolving structure,
A third link whose other end is detachably and rotatably attached to the second attachment portion of the counterweight, and both ends of which are rotatably connected to the first link and the third link, respectively; And a fourth link for operating the link integrally with the first link. The counterweight placed horizontally in the storage position is vertically moved by the operation of each of the links accompanying the expansion and contraction of the hydraulic cylinder. A counterweight moving mechanism characterized in that it is moved to a lifting position while being converted into a state. 2. A rotation amount of a first link rotating around a first fulcrum and a third rotation amount around a second fulcrum.
The fourth link is connected to the first and third links so as to make a difference between the rotation amount of the second link and the rotation amount of the second link. The counterweight moving mechanism according to claim 1, wherein the counterweight is moved to a lifting position while converting the counterweight placed in a horizontal position at the storage position to a vertical state by adjusting the vertical position.