JP2017218322A - Hook block storage device for travel type crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such a problem that a dead space is generated under a hook block in a storage position and which causes the hook block to sag in travelling on a rough road, in a conventional hook block storage device.SOLUTION: In a hook block storage device for a travel type crane, a hook block center line 42 connecting between a hook sheave shaft 7 of a hook block 10 in a storage position and a trunnion shaft 15 is in substantially parallel with a telescopic boom center line 43, and an off-set amount of a top sheave shaft 6 of a boom head 2 in the storage position is smaller than an off-set amount of the hook sheave shaft 7 of the hook block 10.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a hook block storage device that is used in a mobile crane such as a vehicle-mounted crane or a rough terrain crane and winds and stores a hook block with a wire rope using a winch.

In the following description of the background art, in this specification (including claims and abstract), the displacement from the telescopic boom center line to the telescopic boom vent is referred to as “offset”, and the amount of displacement is referred to as “offset amount”. Is defined.
Conventionally, a hook block storage device for a rough terrain crane as shown in FIG. 5 is known (Patent Document 1).
In the hook block storage device described in Patent Document 1, the top sheave 4 is rotatably disposed at an offset portion of the boom head 2, and is disposed in the vicinity of the telescopic boom 1 that is forwardly lowered toward the front and the telescopic boom base end. A hook block 10 in which a hook sheave 5 and a hacker trunnion are rotatably disposed between two winches (not shown), and a position where the offset boom is larger than the top sheave shaft 6 and the offset amount is larger. A storage link 3 connected to the boom head 2 by a pin 8 and rotatable in parallel to a vertical plane including the telescopic boom center line, a wire rope 9 drawn from the winch and hung around the top sheave 4 and the hook sheave 5 It has.

  In the hook block storage device of Patent Document 1 shown in FIG. 5, the hook block 10 and the storage link 3 are suspended from the boom head 2, and the wire rope 9 is wound up by a winch. After the abutting side 10a of the side plate is brought into contact with the abutting surface 11b of the storage link 3, the hook block 10 and the storage link 3 integrated by winding the wire rope with a winch are further extended to the proximal end side of the telescopic boom. And the hook block 10 is stored in a retracted posture that is substantially horizontal.

Japanese Utility Model Publication No. 6-63578

Incidentally, FIG. 5 shows the retracted position of the hook block 10 in the traveling posture where the undulation angle of the telescopic boom 1 is the minimum, but the traveling posture of the rough terrain crane is lowered forward as shown in FIG. In addition to the above, the telescopic boom 1 is horizontal, and the telescopic boom 1 is slightly raised.
When the hook block storage device of Patent Document 1 shown in FIG. 5 is applied to the telescopic boom 1 in a horizontal or front-up traveling posture, there is a problem that the hacker side of the hook block 10 faces downward from the horizontal. If the hacker side of the hook block 10 faces downward from the horizontal, the rough terrain crane will lead to problems such as insufficient distance between the hook block 10 and the ground. Therefore, the hook is further hooked than the storage position shown in FIG. There has been a demand for a hook block storage device capable of taking the storage position (storage position with a small offset amount) where the block 10 is close to the ventral side of the telescopic boom 1.

On the other hand, FIG. 6 shows a case where the hook block storage device of Patent Document 1 is applied to a vehicle-mounted crane. In a vehicle-mounted crane, it is necessary to pass the wire rope 9 on the belly side (offset side) of the telescopic boom. Therefore, the offset amount of the top sheave 4 arranged at the offset portion of the boom head 2 is larger than that shown in FIG. It has become. Therefore, when the hook block storage device of Patent Document 1 is applied to a vehicle-mounted crane, there is a problem that the boom head 2 becomes large, the boom weight increases, and the crane performance decreases.
In the vehicle-mounted crane of the rear storage type when traveling, the lower side of the hook block 10 in the storage position is an article loading space of the truck bed, so that the hook block 10 is inclined downward as shown in FIG. This also increases the dead space in the article loading space.

Furthermore, in the hook block storage device shown in FIG. 6, if the offset amount of the top sheave 4 is to be reduced (the top sheave 4 is disposed upward), the angle of the hook block 10 during storage is further directed downward. After all, dead space will increase.
Therefore, also in the hook block storage device of the vehicle-mounted crane shown in FIG. 6, the offset amount of the top sheave 4 of the boom head 2 is reduced, and the storage position (offset amount) where the hook block 10 approaches the ventral side of the telescopic boom 1. A hook block storage device that can take a small storage position) has been desired.

Further, the hook block storage device shown in FIGS. 5 and 6 also has a problem that the hook block 10 hangs down from the storage link 3 due to loosening of the wire rope 9 due to vertical vibration of the hook block 10 when traveling on a rough road.
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a hook block storage device in which the offset amount of the hook block at the storage position is reduced and the resistance against the hanging of the hook block 10 that occurs when traveling on a rough road is improved.

The mobile crane hook block storage device according to the present invention includes a telescopic boom in which a top sheave is rotatably disposed at an offset portion of a boom head, a winch disposed in the vicinity of the telescopic boom base end, and two side plates. A hook block in which a hook sheave and a hacker trunnion are rotatably arranged, and a pin connected to the boom head at a position where the offset boom is larger than the top sheave shaft and includes the telescopic boom center line A retractable link that is rotatable in parallel with a vertical plane; and a wire rope that is pulled out of the winch, hung around the top sheave and the hook sheave, and connected to a boom head or a hook block at an end thereof. The hook block and the storage link are suspended from the boom head, and the window is After the wire rope is wound up by the hook, the contact side of the side plate of the hook block is brought into contact with the contact surface of the storage link, and then the wire rope is wound up by the winch to be integrated. In the hook block storage device for a mobile crane, the hook block and the storage link are rotated toward the base end side of the telescopic boom and stored in a predetermined storage position. In the hook block storage device of the mobile crane, the side plate is connected to the hook sheave shaft. There are two parallel sides facing each other, and a contact side formed by a straight line surrounding the hook sheave shaft forms an acute corner with one of the two parallel sides, and at the storage position, The two parallel sides of the side plate of the hook block are parallel to the telescopic boom center line, and one of the two parallel sides forming the acute corner portion is the other Characterized in that located on the side offset amount is large relative to the sides.
By taking the storage position, the two parallel sides of the side plate of the hook block are parallel to the telescopic boom center line, so the hook block is closer to the telescopic boom. Further, in the storage position, one of the two parallel sides of the hook block side plate that forms an acute corner portion is positioned on the side where the offset amount is larger than the other side, so that the offset amount of the hook sheave shaft is larger. Since the offset amount of the top sheave shaft is reduced, the offset amount of the top sheave shaft of the boom head can be reduced. In addition, the length of the contact side of the hook block that contacts the contact surface of the storage link can be increased.

In the hook block storage device of the present invention, the hook block center line connecting the hook sheave shaft and the trunnion shaft of the hook block is substantially parallel to the telescopic boom center line and the top sheave shaft of the boom head is in the storage position. The offset amount is smaller than the offset amount of the hook sheave shaft of the hook block.
By taking the storage position, the hook block center line connecting the hook sheave shaft and the trunnion shaft of the hook block is substantially parallel to the telescopic boom center line, so that the hook block comes closer to the telescopic boom. Further, in the storage position, the offset amount of the top sheave shaft of the boom head is smaller than the offset amount of the hook sheave shaft of the hook block, so that the offset amount of the top sheave shaft of the boom head can be reduced.

In the hook block storage device of the present invention, when the retractable posture is such that the center line of the telescopic boom is substantially horizontal, the contact surface of the storage link that contacts the contact side of the side plate of the hook block is inclined and contacts the hook block side. As a result, not only the frictional force but also the vertical drag is generated against the hook block that moves up and down due to the vibration when traveling on a rough road, so that the hook block can be prevented from jumping up when traveling on a rough road. In addition, since the contact side of the hook block that contacts the contact surface of the storage link is longer than before, the wire rope tension generated by the vertical movement of the hook block when traveling on a rough road is reduced and it is difficult for loosening to occur. Even if the wire rope is loosened, the change in the storage position (hanging) of the hook block is reduced.

In the mobile crane hook block storage device of the present invention, the hook block comes close to the telescopic boom at the storage position (the offset amount becomes small), so that the dead space below the telescopic boom can be reduced. it can.
In addition, since the offset amount of the top sheave shaft of the boom head of the telescopic boom can be reduced, the boom head can be reduced and an increase in the weight of the telescopic boom can be suppressed.
Furthermore, since the hook block can be prevented from jumping up when traveling on a rough road, it is possible to improve the resistance against the drooping of the hook block 10 caused by the loosening of the wire rope during rough road traveling.

It is a vehicle-mounted crane equipped with a hook block storage device according to the present invention. It is the state before storage of the hook block storage device concerning the present invention. It is a hook block of the hook block storage device concerning the present invention. It is a storage attitude | position of the hook block storage apparatus which concerns on this invention. This is a hook storage device described in Patent Document 1. This is a storage posture when the hook block storage device described in Patent Document 1 is applied to a vehicle-mounted crane.

  FIG. 1 shows a vehicle-mounted crane 20 equipped with a hook block storage device according to the present invention. The vehicle-mounted crane 20 is configured by mounting a crane body 25 on a chassis frame 23 of a truck vehicle 22 having a loading platform 21 and an operator cab 24. The lower frame 27 of the crane body 25 is fixed on a reinforcing member 26 disposed on the chassis frame 23 at a position between the cab 24 and the loading platform 21 of the truck vehicle 22. An outrigger 29 is disposed on the lower frame 27. The outrigger 29 can extend downward, and the vehicle-mounted crane 20 performs a crane operation in a state where the outrigger 29 is in contact with the ground.

  On the lower frame 27, a turning post 28 that can turn with respect to the lower frame 27 is provided. A pin is connected to the upper end of the swivel post 28 so that the telescopic boom 1 can be raised and lowered. A hoisting cylinder 30 is disposed between the base end portion of the telescopic boom 1 and the lower portion of the turning post 28, and both ends thereof are pin-connected. By extending and retracting the hoisting cylinder 30, the telescopic boom 1 is driven to hoist.

The winch 31 is disposed on the swivel post 28, and the wire rope 9 drawn from a drum (not shown) disposed in the swivel post 28 is guided to the boom head 2 through the belly side (lower side) of the telescopic boom 1. It is burned.
FIG. 1 shows the traveling posture of the vehicle-mounted crane 20. The outrigger 29 is fully reduced, and the telescopic boom 1 is fully reduced and has a minimum undulation angle (substantially horizontal). The telescopic boom 1 is stored in a posture (rear storing posture) facing the rear of the vehicle.
In addition, although embodiment of this invention is described based on the example applied to the vehicle-mounted crane 20 shown in FIG. 1, this invention is applicable also to other mobile cranes, such as a rough terrain crane. Of course.

FIG. 2 shows the tip of the telescopic boom 1 of the vehicle-mounted crane 20 shown in FIG. 1, and shows the hook block storage device according to the present invention in a state before storage. The telescopic boom 1 is in the retracted position with the total reduction and the minimum undulation angle.
The telescopic boom 1 is a five-stage telescopic boom in which a second boom 1b, a third boom 1c, a force boom 1d, and a top boom 1e are sequentially fitted to a base boom 1a so as to be telescopic.
A top sheave 4 is rotatably disposed at an offset portion of the boom head 2 of the telescopic boom 1.

3 (a) is a front view of the hook block 10 according to the present invention, and FIG. 3 (b) is a side view.
As shown in FIG. 3A, the hook block 10 has a hook sheave 5 and a trunnion 15 of a hacker 14 rotatably disposed between two side plates 13. In the present embodiment, there are four hook sheaves 5.
As shown in FIG. 3B, the side plate 13 has two parallel sides 35 and 36 (left and right sides) facing each other across the hook sheave shaft 7. A contact side 10a formed of a straight line surrounding the hook sheave shaft 7 is a part that contacts the contact surface 11b of the storage link 3 shown in FIG.
As shown in FIG. 3B, the contact side 10a (upper side) of the side plate 13 is inclined upward to the right, and an acute angle corner portion 37 having an acute angle with the right side 36 of the side plate 13 is formed. Forming.

In the hook block 10 shown in FIG. 3B, the abutting side 10a of the side plate 13 and the left side 35 of the side plate 13 form a chamfered portion 38. This chamfered portion 38 is directly connected to the present invention. It doesn't matter.
As for the hook block, the present invention can be applied even if the hook sheave 5 and the trunnion 15 of the hacker 14 are not rotatably arranged between the two side plates 13 as shown in FIG. That is, it may be a hook block in which a hook sheave is rotatably arranged on an outer shell integrally formed by casting or the like. Alternatively, a hook block may be used in which a hacker is disposed directly on the hook sheave shaft without providing a trunnion.

The storage link 3 shown in FIG. 2 is connected to the boom head 2 by a pin 8 at a position in the distal end direction of the telescopic boom 1 and the direction in which the offset amount increases (downward in FIG. 2) from the top sheave shaft 6. Thereby, the storage link 3 is rotatable in parallel to a vertical plane including the center line 43 of the telescopic boom 1.
The storage link 3 is provided with an abutment surface 11b with which the abutment side 10a of the side plate 13 of the hook block 10 abuts. A support plate 12 protrudes from the contact surface 11b. As will be described later, in the retracted position of the hook block 10, the support plate 12 comes into contact with the acute corner portion 37 of the contact side 10 a of the side plate 13 of the hook block 10.
The storage link 3 includes a pair of guide supports 40 and 41 that protrude from the contact surface 11 b and face each other with a distance between the outer sides of the side plates 13 of the hook block 10. As will be described later, at the storage position of the hook block 10, the guide supports 40 and 41 sandwich both outer sides of the side plate 13 of the hook block 10.

A guide sheave support 31 having a guide sheave 32 rotatably provided is provided on the distal side of the base boom 1a. Further, a guide sheave support 33 provided with a guide sheave 32 so as to be rotatable is also provided on the distal end side of the third boom 1c. A contact surface 34 with the side plate 13 of the hook block 10 is provided on the guide sheave support 33 of the third boom 1c.
The wire rope 9 pulled out from the winch is hung around the top sheave 4 and the hook sheave 5 via the guide sheave supports 31 and 33, and then the rope head (not shown) at the tip thereof is provided on the boom head 2. It is connected to a bracket (not shown).

The storage operation of the hook block storage device described above is as follows.
As shown in FIG. 2, the hook block 10 and the storage link 3 are suspended from the boom head 2, and the contact side 10a of the side plate 13 of the hook block 10 is wound around the storage link 3 by winding the wire rope 9 with a winch. Is brought into contact with the contact surface 11b. At this time, the acute angle corner portion 37 of the side plate 13 of the hook block 10 also comes into contact with the support plate 12 of the storage link 3.
When the winch is further wound up, the hoisting force line 44 (line 44 connecting the top sheave shaft 6 and the hook sheave shaft 7) of the hook block 10 is closer to the base end side of the telescopic boom 1 than the pin 8 that serves as the pivot point of the storage link 3. Therefore, the hook block 13 and the storage link 3 integrated with each other rotate toward the base end side of the telescopic boom 1.

As shown in FIG. 4, when the hook block 10 comes into contact with the guide sheave support 33 of the third boom 1c, the rotation operation is completed. The position where the side 35 of the side plate 13 of the hook block 10 contacts the contact surface 34 of the guide sheave support 33 is the storage position of the hook block 10.
In the retracted position of the hook block 10 shown in FIG. 4, the two parallel sides 35 and 36 of the side plate 13 of the hook block 10 are parallel to the telescopic boom 1 center line 43. At this time, of the two parallel sides, one side 36 forming the acute angle corner portion 37 is located on the side (lower side) where the offset amount is larger than the other side 35.

At this time, the hoisting force line 44 (line 44 connecting the top sheave shaft 6 and the hook sheave shaft 7) of the hook block 10 is inclined upward (in the direction in which the offset amount decreases) toward the tip of the telescopic boom 1. At this time, the winding force line 44 intersects the contact surface 11b of the storage link 3 at a substantially right angle.

In the retracted position of the hook block 10 shown in FIG. 4, the hook block center line 42 connecting the hook sheave shaft 7 and the trunnion shaft 15 of the hook block 10 is substantially parallel to the telescopic boom center line 43 and the top of the boom head 2 The offset amount of the sheave shaft 6 is smaller than the offset amount of the hook sheave shaft 7 of the hook block 10.
By taking the storage position, the hook block 10 becomes closer to the telescopic boom 1. In the storage position, the offset amount of the top sheave shaft 6 of the boom head 2 of the telescopic boom 1 is small.

In the hook block storage device of the present invention, when the telescopic boom center line 43 is substantially horizontal in the storage position, the contact surface 11b of the storage link 3 that contacts the contact side 10a of the hook block 10 is the hook block 10. Since it is inclined to the side, not only the frictional force but also the vertical drag is generated, so that the hook block 10 is prevented from jumping up when traveling on a rough road.
Furthermore, since the contact side 10a of the hook block 10 that contacts the contact surface 11b of the storage link 3 is longer than the conventional one, the wire rope tension generated by the vertical movement of the hook block 10 when traveling on a rough road is reduced and loosened. In addition to being less likely to occur, for example, even if the wire rope 9 is loosened, the storage posture change (hanging down) of the hook block 10 is reduced.

As described above, since the hook block storage device according to the present invention is in the position where the hook block 10 is close to the telescopic boom 1 in the storage position, the dead space below the telescopic boom 1 can be reduced.
Furthermore, since the offset amount of the top sheave shaft 6 of the boom head 2 of the telescopic boom 1 is reduced, the boom head 2 can be made smaller and the increase in the weight of the telescopic boom 1 can be suppressed.
Further, since the hook block 10 can be prevented from jumping up during traveling, the resistance against the hanging of the hook block 10 can be improved.

  As shown in FIG. 4, by providing the support plate 12 protruding from the contact surface 11b of the storage link 3, the hook block 10 is sandwiched and supported by the support plate 12 and the guide sheave support 33 in the offset direction of the storage position. Will do. For this reason, the storage positioning of the hook block 10 in the offset direction becomes accurate, and the vertical displacement of the hook block 10 during traveling on a rough road is suppressed. Thereby, the resistance force against the hanging of the hook block 10 is further increased.

  Further, as shown in FIG. 4, by providing a pair of guide supports 40 and 41 that protrude from the contact surface 11 b of the storage link 3 and face each other, the guide supports 40 are provided on both sides of the side plate 13 of the hook block 10 in the storage position. , 41 is sandwiched. As a result, the right / left positional deviation of the hook block 10 when traveling on a rough road is suppressed.

1: telescopic boom 2: boom head 3: storage link 4: top sheave 5: hook sheave 6: top sheave shaft 7: hook sheave shaft 8: pin 9: wire rope 10a: contact side 11b: contact surface 12: support plate 13 : Side plate 15: trunnion shaft 33: guide sheave support 37: acute corner portion 40, 41: guide support 42: hook block center line 43: telescopic boom center line

Claims (6)

A telescopic boom in which the top sheave is rotatably arranged at the offset part of the boom head;
A winch disposed near the base end of the telescopic boom;
A hook block in which a hook sheave and a hacker trunnion are rotatably arranged between two side plates;
A storage link that is pin-connected to the boom head at a position in the direction of the distal end of the telescopic boom from the top sheave shaft and in a direction in which the offset amount increases, and is rotatable in parallel to a vertical plane including the telescopic boom center line;
A wire rope pulled out from the winch, hung around the top sheave and hook sheave, and having its end connected to a boom head or hook block;
In a state where the hook block and the storage link are suspended from the boom head, the contact side of the side plate of the hook block is brought into contact with the contact surface of the storage link by winding the wire rope with the winch. After that, the mobile crane further rotates the hook block and the storage link integrated by winding the wire rope with the winch toward the proximal end of the telescopic boom, and stores it in a predetermined storage position. In the hook block storage device of
In the hook block, the side plate has two parallel sides facing each other across the hook sheave axis, and a contact side formed by a straight line surrounding the hook sheave axis is an acute corner with one of the two parallel sides Forming part,
In the retracted position, two parallel sides of the hook block side plate are parallel to the telescopic boom center line, and one of the two parallel sides that forms the acute corner portion is offset from the other side. A hook block storage device for a mobile crane, characterized in that it is located on the larger side. A telescopic boom in which the top sheave is rotatably arranged at the offset part of the boom head;
A winch disposed near the base end of the telescopic boom;
A hook block in which a hook sheave and a hacker trunnion are rotatably arranged between two side plates;
A storage link that is pin-connected to the boom head at a position in the direction of the tip of the boom and the amount of offset larger than the top sheave shaft, and is rotatable in parallel to a vertical plane including the telescopic boom center line;
A wire rope pulled out from the winch, hung around the top sheave and hook sheave, and having its end connected to a boom head or hook block;
In a state where the hook block and the storage link are suspended from the boom head, the contact side of the side plate of the hook block is brought into contact with the contact surface of the storage link by winding the wire rope with the winch. After that, the mobile crane further rotates the hook block and the storage link integrated by winding the wire rope with the winch toward the proximal end of the telescopic boom, and stores it in a predetermined storage position. In the hook block storage device of
In the retracted position, the hook block center line connecting the hook sheave shaft and trunnion shaft of the hook block is substantially parallel to the telescopic boom center line, and the offset amount of the top sheave shaft of the boom head is the hook sheave shaft of the hook block. The hook block storage device for a mobile crane, which is smaller than the offset amount. The hook block storage device for a mobile crane according to claim 1 or 2, wherein the telescopic boom center line is substantially horizontal at the storage position. A support plate protruding from the abutment surface of the storage link;
3. The mobile crane according to claim 1, wherein, in the retracted position, the support plate abuts on an end portion on a side where the offset amount of the abutment side of the side plate of the hook block is large. Hook block storage device. Provided with a guide sheave support of the wire rope on the boom head tip side of any boom stage constituting the telescopic boom,
The hook block storage device for a mobile crane according to claim 1 or 2, wherein the guide sheave support abuts against a side plate of the hook block in the storage position. A pair of guide supports protruding from the abutment surface of the storage link and facing each other;
3. The hook block storage device for a mobile crane according to claim 1, wherein, in the storage position, the guide support sandwiches both sides of the side plate that are outside the contact side of the hook block. 4.

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