JP7295499B2 - Hook storage structure, hook storage system and method - Google Patents

Description

The present invention relates to a hook storage structure for storing a hook of a mobile crane, a hook storage system including this hook storage structure, and a method for controlling movement of the hook relative to the hook storage structure.

A mobile crane travels, for example, in a retracted state in which a hook is hung on a latch. Conventionally, when the hook is put into this retracted state or when the hook is released from the retracted state, the operator has to leave the operator's cab and go to the latch to perform the work, which is troublesome. Therefore, various mechanisms or devices have been proposed that do not necessarily require the operator to leave the operator's cab (see, for example, Patent Document 1).

Japanese Utility Model Laid-Open No. 5-40288

By the way, in the proposal of Patent Document 1 as well, in order to make the hook in the retracted state usable, it is first necessary to disengage the hook from the locked state with the locking tool. When the hook is disengaged from the locking device, the operator raises the boom in its lying down position and controls them so that the wire rope extending from the tip thereof and connected to the hook is paid out. This requires the operator to perform two operations substantially concurrently.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a structure that makes it possible to more easily release a hook from a locked state with a locking tool or the like when making the hook in the retracted state usable in a mobile crane. be.

In order to achieve the above object, one aspect of the present invention is a hook storage structure for storing a hook of a mobile crane, which is configured to be able to rise and fall at least with respect to a body frame of the mobile crane. When the boom is in a predetermined first collapsed state, a sloping portion that is slanted to face the tip side of the boom, and a slant portion that is positioned at the upper end of the sloping portion and suspended from the boom by a wire. and a stop configured to allow the hook to be hooked, the ramp having the wire leading to the hook when the hook is positioned in the hook storage structure. To provide a hook storage structure further provided with a passable wire passage .

Preferably, the inclined portion is configured such that the length from the lower end portion of the inclined portion to the stopper is longer than the total length of the hook.

Preferably, the hook retraction structure described above further comprises a force relief mechanism configured to prevent the stopper from exerting a force exceeding a predetermined value from the hook.

Preferably, said inclined portion is shaped to guide a guided portion provided on said hook.

The invention also resides in a hook storage system comprising the hook storage structure described above and a control configured to control movement of the hook relative to the hook storage structure. The present invention also resides in a method of controlling movement of the hook relative to the hook storage structure. This method preferably comprises the steps of: reeling out the wire so as to lower the hook positioned above the storage area on the lower end side of the inclined portion into the storage area; and when the hook is positioned in the storage area, a step of lowering the boom until it reaches the predetermined first state while keeping the hook in the storage area; and winding the wire. The method also includes the steps of: unreeling the wire so as to move the hook away from the stopper and along the ramp to the storage area; and when the hook is positioned in the storage area, the raising the boom to a second predetermined condition while maintaining the hook in the storage area; and retracting the wire to remove the hook from the storage area when the boom is in the second predetermined condition. and winding.

According to the above aspect of the present invention, since it has the above configuration, when applied to a mobile crane, when the hook of the mobile crane is enabled, it can be more easily released from the locked state with the stopper. enable.

1 is a schematic configuration diagram of a rough terrain crane as a mobile crane according to one embodiment of the present invention; FIG. 2 is a perspective view of a hook storage container having a hook storage structure according to the present embodiment of the mobile crane of FIG. 1; FIG. (a) is a top view, (b) is a front view, and (c) is a left side view of an inclined frame of the hook storage container of FIG. 2 . FIG. 2 is a block diagram showing a control configuration of a hook in the mobile crane of FIG. 1; 1. It is the figure which represented the flow of the storage operation of the hook to the hook storage container in order from (a) to (c) in the mobile crane of FIG. 1. It is the figure which represented in order from (a) to (c) the flow of the take-out operation of the hook from the hook storage container in the mobile crane of FIG. It is a figure for demonstrating the movement of the hook along the inclination part of a hook storage container in the step of Fig.6 (a). FIG. 2 is a schematic configuration diagram of a rough terrain crane with two hooks as a modification of the embodiment of FIG. 1; 3A is a perspective view of a modified example of the hook storage container in FIG. 2, and FIG. 4B is a diagram illustrating the relationship between the hook storage container and the hook in FIG. It is a cross-sectional schematic diagram for demonstrating. It is a cross-sectional schematic diagram for demonstrating the relationship between the hook storage container of Fig.9 (a), and a hook. It is a figure showing the modification of the hook storing structure of FIG. 2, (a) shows the place where the hook left|separated from the hook storing structure, (b) is a figure which shows the place where the hook is guided by the hook storing structure. be.

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment according to the present invention will be described below with reference to the accompanying drawings. The same parts (or configurations) are given the same reference numerals, and their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

A rough terrain crane 1 according to one embodiment of the present invention is a mobile crane, and as shown in FIG. outriggers 11, . . . , a swivel base 12 attached to a body frame 10 so as to be capable of horizontal swivel, and a boom 14 attached to an upper part 13 of a swivel frame of the swivel base 12. As shown in FIG. In the rough terrain crane 1 of this embodiment, a hook storage container 20 is arranged at the front end of the swivel base 12 and below the boom 14 in the traveling posture (see FIG. 1). The configuration of the hook container 20 will be described later.

The outriggers 11 can be slidably extended/retracted to the outside in the width direction from the vehicle body frame 10 by extending and retracting the slide cylinders, and can be vertically extended/retracted from the vehicle body frames 10 by extending and retracting the jack cylinders. It is possible.

The swivel base 12 has a pinion gear to which the power of the swivel motor is transmitted. The pinion gear meshes with a circular gear provided on the vehicle body frame 10 to rotate about the swivel axis. The swivel base 12 has an operator's cab 18 arranged on the front right side, a swivel frame upper part 13 arranged at the rear center, and a counterweight 19 arranged at the rear lower part.

The boom 14 telescopically includes a plurality of stages of boom components including a proximal boom 14a closest to the swivel base 12 and a distal boom 14b closest to the distal end, and can be extended and retracted by an internally disposed telescoping cylinder. The boom 14 in FIG. 1 is in its most retracted state. A sheave (pulley) is arranged at the tip of the boom 14, that is, the tip of the tip boom 14b. A wire rope 16 (hereinafter referred to as wire 16) is looped around the sheave to suspend a hook 17. As shown in FIG. The end of wire 16 is wound around a winch (not shown).

One end of the base end boom 14a is rotatably attached to a support shaft that is installed substantially horizontally on the upper part of the revolving frame 13, and can be raised and lowered about the support shaft as the center of rotation. Furthermore, a hoisting cylinder 15 is bridged between the swing frame upper portion 13 and the bottom surface of the base end boom 14a, and by extending and contracting the hoisting cylinder 15, the entire boom 14 can be hoisted. there is

Next, the configuration of the hook storage structure S1 will be described. As shown in the perspective view of FIG. 2, the hook storage structure S1 is composed of a hook storage container 20 arranged at the front end of the swivel base 12 and below the boom 14 in the running posture. The hook storage container 20 is attached so as to protrude forward from the forward-facing side surface (front surface, front end surface) of the swivel base 12 . Further, the hook storage container 20 is arranged in the vehicle width direction below the boom 14 in the running posture, that is, at a position slightly leftward from the approximate center in the vehicle width direction. In short, the hook container 20 is positioned on the front left side of the cab 18 . In addition, as shown in FIG. 1, the state of the traveling posture in which the boom 14 is laid down corresponds to the predetermined first state in which the boom 14 is laid down.

The hook storage container 20 is for storing the hook 17 with which the wire 16 extends, and has a structure for that purpose. As shown in FIG. 2, the hook storage container 20 is generally formed in a container-like or box-like shape with an open top. Further, the hook storage container 20 is formed so that the upper cross-sectional area (frontage) is wide and the lower cross-sectional area is narrow. As a result, the hook 17 can be easily received from above, and rattling when the hook 17 is completely accommodated is reduced.

Specifically, the hook storage container 20 of this embodiment includes a pair of side plate portions 21 and 22 arranged on the left and right, a bottom plate portion 23 arranged below, and a front inclined portion 24 arranged forward. and a rear plate portion 25 disposed rearward. 3 shows the angled frame 26 of the hook container 20. As shown in FIG. The side plate portions 21 and 22 are arranged parallel to each other so as to face each other. The side plate portions 21 and 22 and the rear plate portion 25 are provided so as to form a right angle with the bottom plate portion 23 . The side plate portions 21 and 22 are provided so as to form a right angle with the rear plate portion 25 . In the hook storage container 20 , the front plate inclined portion 24 extends from the bottom plate portion 23 at an angle. The side plate portions 21 and 22 are substantially pentagonal portions, and include parallel upper end portions 21a and 22a that are parallel to the bottom plate portion 23 and extend to the rear plate portion 23, and a front plate inclined portion 24 extending from the parallel upper end portions 21a and 22a. and sloping upper ends 21b, 22b extending to the . The inclined upper end portions 21b and 22b are inclined toward the bottom plate portion 23 from the rear plate portion 25 side to the front plate inclined portion 24 side. The front plate inclined portion 24 extends to the tip portions 21c, 22c of the inclined upper end portions 21b, 22b. Each part of the inclined frame 26 is joined by welding.

Hook container 20 further comprises a stopper 28 . The stopper 28 is provided on the tilt frame 26 so as to partially cover the opening 29 of the tilt frame 26 . Here, the stopper 28 is fixed to the tilt frame 26 by welding. In addition, the stopper 28 may be configured integrally with part or all of the inclined frame 26 from the beginning to configure a part of the hook storage container 20 .

The opening 29 of the inclined frame 26 of the hook storage container 20 includes a parallel opening 29r parallel to the bottom plate 23 on the side of the rear plate 25 and an inclined opening 29f inclined toward the front plate sloping portion 24 toward the bottom plate 23 side. and The stopper 28 is provided on the inclined frame 26 from the inclined opening 29f to a portion of the parallel opening 29r. Thus, the stopper 28 is positioned at the upper end portion of the front plate inclined portion 24 . As can be understood from the description given later, the stopper 28 is configured to allow the hook 17 suspended by the wire 16 from the boom 14 to be hooked on itself.

The inclined front plate portion 24 of the inclined frame 26 is further provided with a wire passage 30 through which the wire 16 connected to the hook 28 can pass when the hook 17 is positioned in the hook container 20 as will be described later. there is In this embodiment, the wire passage 30 extends to the bottom plate portion 23 so as to bisect the front plate inclined portion 24 . The stopper 28 is composed of a pair of stopper portions 31 and 32 that are spaced apart from each other so as not to interfere with the wire 16 entering and exiting the wire passage 30 , and the wire passage 30 is extended to the stopper 28 .

As shown in FIG. 2, the pair of stopper portions 31 and 32 are each formed as a bent plate portion, and in this embodiment, between the front end portions 31a and 32a and the rear end portions 31b and 32b of the stopper portions 31 and 32, respectively. The angle between is an obtuse angle. Further, each of the rear end portions 31b and 32b has a shape in which the width becomes narrower from the front plate inclined portion 24 side to the rear plate portion 25 side. This makes it possible to guide the entry of the wire 16 into the wire passage 30 . In each of the stopper portions 31, 32, the front ends 31a, 32a are connected to the inclined upper ends 21b, 22b of the side plate portions 21, 22 and the front plate inclined portion 24, and the rear ends 31b, 32b are connected to the side plate portions 21, 22. parallel upper ends 21a, 22a.

The hook storage container 20 is arranged so as to face a predetermined direction. Specifically, when the boom 14, which is configured to be at least capable of raising and lowering with respect to the vehicle body frame 10, is in a predetermined first state (see FIG. 1), the front plate inclined portion 24 is positioned at the tip portion of the boom 14. slanted to the side. Hook containment 20 fulfills this relationship with boom 14 .

A block diagram of the control configuration of the hook 17 of the rough terrain crane 1 is shown in FIG. The control unit 50 is a so-called computer, and has a processing device (for example, CPU), a storage unit (for example, ROM, RAM), and an input/output unit. A camera 52 and an input device 54 are electrically connected to the controller 50 . Although not shown, the camera 52 is provided on the boom 14, and here it is particularly provided at its tip. The input device 54 is one or more devices, which can be levers, switches, etc., operated by the operator, and enables signals relating to the raising and lowering of the boom 14 and the payout and hoisting of the wire 16 to be input to the control unit 50 . The control unit 50 controls each operation of the hoisting device 56 for the wire 16 and the boom drive mechanism 58 based on the inputs from these. The hoisting device 56 includes the winch described above. The boom drive mechanism 58 includes the hoisting cylinder 15 described above.

The control unit 50 has an automatic control unit 501, a wire control unit 502, and a boom control unit 503 as functional modules. Each functional module is realized by executing a program stored in the storage unit by the control unit 50, that is, the processing device.

The automatic control section 501 automatically controls the movement of the hook 17 with respect to the hook storage container 20 according to the input from the input device 54 . Inputs from the input device 54 include, for example, an input of an instruction signal to store the hook 17 into the hook storage container 20 and an input of an instruction signal to remove the hook 17 from the hook storage container 20 . The automatic control unit 501 has a function of learning this automatic control. The automatic control section 501 here sends an actuation signal to the wire control section 502 and the boom control section 503 to cause the hook 17 to move relative to the hook container 20 .

A wire control unit 502 controls the operation of the hoisting device 56 including the winch. As a result, the wire 16 can be rolled down (unrolled) or rolled up.

A boom control unit 503 controls the operation of the boom drive mechanism 58 . As a result, the boom 14 can be raised and lowered.

In this way, the control section 50 corresponds to a control section configured to control movement of the hook 17 with respect to the hook storage container 20 having the hook storage structure S1. The control unit 50 and the hook storage container 20 constitute a hook storage system.

Next, movement control of the hook 17 with respect to the hook storage container 20 of the hook storage structure S1 will be described with reference to FIGS. 5 and 6. FIG. First, a method of controlling storage of the hook 17 in the hook storage container 20 by the automatic control section 501 of the control section 50 will be described. However, the operator can manually perform the following operations in the order based on FIGS. 5 and 6, only the upper part of the rough terrain crane 1 is shown.

Boom 14 is pivoted and/or hoisted and/or retracted to move hook 17 above hook container 20 . In particular, here, the hook 17 is moved above the storage area A on the lower end side of the front plate inclined portion 24 in the hook storage container 20 . Specifically, the storage area A is an area on the bottom plate portion 23 on the lower end side of the front plate inclined portion 24, and can be conceptually represented in FIG. 3(a). A storage area A on the lower end side of the front plate inclined portion 24 is an area outside the stopper 28 due to the above configuration of the hook storage container 20 . Incidentally, when the hook 17 is moved in this manner, the boom 14 is preferably in a predetermined telescopic state. Here, the predetermined stretched state is the most contracted state as shown in FIG.

Then, in the step shown in FIG. 5A, the wire 17 is let out so that the hook 17 is lowered into the storage area A. As shown in FIG. At this time, the hook 17 is preferably lowered until a part of the hook 17 contacts at least the lower end portion of the inclined front plate portion 24 of the hook storage container 20 or the bottom plate portion 23 . At this time, the control unit 50 (or the operator in the driver's seat 18 ) can confirm the position of the hook 17 from the image from the camera 52 . When the operator performs this operation, the hook storage container 20 is positioned in front left of the driver's seat 18, so the operator can directly check the state of the hooks 17 in the hook storage container 20 from the driver's seat 18.

Next, in the step shown in FIG. 5(b), while the hook 17 is kept in the storage area A, the boom 14 is laid down until it reaches a predetermined state (hereinafter referred to as a predetermined first state). This predetermined first state is a lying state in which the boom 14 is laid sideways as shown in FIG. 1, and can also be referred to as a travelable state. In this lodging operation, the winch lowering and hoisting operations of the hoisting device 56 can be used together. As a result, it is possible to prevent the wire 16 from being subjected to a force greater than or equal to a predetermined value.

Then, in the step shown in FIG. 5(c), when the boom 14 is in the predetermined first collapsed state, the wire 16 is wound up until the hook 17 is caught by the stopper 28 of the hook storage container 20, that is, until it is locked. . As a result, the hook 17 is locked by the stopper 28 to be in a locked state, and is in a stored state in which it is stored in the hook storage container 20 .

Next, control for taking out the hook 17 from the hook storage container 20 will be described with reference to FIGS. 6 and 7. FIG.

First, in the step shown in FIG. 6( a ), the hook 17 is separated from the stopper 28 and moved to the storage area A along the front plate inclined portion 24 . This movement of the hook 17 is executed by performing a winch lowering operation of the hoisting device 56 so as to let out the wire 16 . Note that the wire 16 may be drawn out not only by the operation of lowering the winch, but also by making the wire 16 freely pulled out by the weight of the hook 17, for example. As shown in FIGS. 5(c) and 7(a), when the hook 17 is engaged with the stopper 28 of the hook storage container 20 and is in the stored state, the hook 17 is supported by leaning against the front plate inclined portion 24. and is separated from the bottom plate portion 23 and is in a hanging state. Therefore, simply by performing the winch lowering operation and letting out the wire, the hook 17 slides down the front plate inclined portion 24 and leaves the stopper 28 as shown in FIGS. The locked state locked by the stopper 28 can be released. This allows the hook 17 to reach the storage area A.

Next, in the step shown in FIG. 6(b), the boom 14 is raised while the hook 17 is kept in the storage area A. Then, as shown in FIG. More specifically, the boom 14 is raised until the wire 16 extending from the hook 17 located in the storage area A extends straight vertically. The state in which the boom 14 is raised at this time corresponds to the predetermined second state (see FIG. 6(c)). At this time, the boom 14 can be swiveled and/or raised and/or stretched, and the winch lowering/hoisting operation of the hoisting device 56 can be used in combination.

Then, in the step shown in FIG. 6(c), the hook 17 is taken out from the storage area A when the boom 14 is in a predetermined second state in which it is raised. This removal of the hook 17 is accomplished by the winch hoisting operation of the hoisting device 56 . This makes the hook 17 ready for use.

In this manner, the automatic control section 501 of the control section 50 automatically controls the movement of the hook 17 with respect to the hook container 20 according to the input of the automatic control signal from the input device 54 . At this time, it is preferable that the automatic control section 501 transmits an actuation signal to the wire control section 502 and the boom control section 503 by learning and storing the data of the storing operation and the taking out operation previously performed by the operator. When the wire control unit 502 and the boom control unit 503 are operated according to instructions from the automatic control unit 501, image data from the camera and outputs from various sensors such as a sensor for measuring the extension length of the wire 16 should be referred to.

As described above, the rough terrain crane 1 includes the hook storage container 20 . The hook storage container 20 includes the front plate inclined portion 24 and the stopper 28 . The front plate inclined portion 24 is inclined so as to face the tip portion side of the boom 14 when the boom 14, which is configured to be able to rise and fall with respect to the vehicle body frame 10, is in a predetermined first collapsed state. . Also, the stopper 28 is positioned at the upper end of the front plate inclined portion 24 and is configured to allow the hook 17 suspended from the boom by a wire to be hooked. Therefore, when the hook 17 suspended by the wire 16 on the boom 14 is stored in the hook storage container 20, by positioning the hook 17 in the storage area A on the lower end side of the front plate inclined portion 24 and winding up the wire 16, The hook 17 can be stored in a locked state with the stopper 28 inside the hook storage container 20 . The hook 17 can be easily positioned in the storage area A simply by winding down or letting out the wire 16 connected to the hook 17 in such a state. It is possible to more easily get out of the locked state.

Further, as clearly shown in FIG. 7, the front plate sloping portion 24 is constructed such that the length L1 from the lower end of the front plate sloping portion 24 to the stopper 28 is longer than the total length L2 of the hook 17. . Therefore, the above-described step of releasing the hook 17 from the locked state can be generated more favorably.

Further, the front plate inclined portion 24 is provided with a wire passage 30 through which the wire 16 connected to the hook 17 can pass when the hook 17 is positioned in the hook storage container 20 . Therefore, when the hook 17 is moved with respect to the hook storage container 20, it is possible to suitably apply force from the wire 16 to the hook 17 while avoiding abrasion of the wire 16 and the like.

In addition, for example, as described with reference to FIG. 5(c), when the wire 16 is wound so as to hook the hook 17 on the stopper 28, a force relaxation mechanism is provided to prevent a force exceeding a predetermined value from being applied to the stopper 28. is desirable. For example, a low pressure relief valve may be provided in the hydraulic circuit of the winch to prevent such forces from acting on stop 28 . In addition to or instead of the low pressure relief valve, the hook container 20 may be provided with a pivoting mechanism therefor. This rotating mechanism has, for example, a hinge structure, and may be provided with respect to the swivel base 12 or the vehicle body frame 10 at the connecting portion between the front plate inclined portion 24 and the bottom plate portion 23 . As a result, as indicated by an arrow R in FIG. 3(b), by rotating the stopper 28 together with the front plate inclined portion 24 of the hook container 20, the force can be alleviated.

In recent years, rough terrain cranes, which are mobile cranes, have come to be equipped with a plurality of hooks 17, such as two hooks 17M and 17S, as shown in FIG. At this time, it is preferable that a hook storage container 20 is provided for each hook 17 . In the rough terrain crane 1A of FIG. 8, a main hook 17M and a sub hook 17S are suspended. Here, they are arranged side by side in FIG. In this case, as shown in FIG. 8, the hook storage container 20M for the main hook 17M and the hook storage container 20S for the sub hook 17S should be provided in a positional relationship corresponding to the positional relationship between the main hook 17M and the sub hook 17S. . The length L3 between the main hook 17M and the sub hook 17S in FIG. 8 is a dimension difference within a predetermined range from the length L4 between the hook storage container 20M for the main hook 17M and the hook storage container 20S for the sub hook 17S. have By doing so, when storing the main hook 17M and the sub hook 17S, both hooks 17M and 17S can be stored at once as described with reference to FIG. This also applies to the subsequent takeout operation.

Here, preferred dimensions and the like of the hook container will be described with reference to FIGS. 9 and 10. FIG. A hook storage container 20a shown in FIGS. 9 and 10 is partially different from the hook storage container 20 described above, but has the same characteristic configuration. The dimensions and the like described below apply equally to the hook container 20 described above.

FIG. 9(a) is a see-through perspective view of the interior of the hook storage container 20a, and FIG. 9(b) is a schematic cross-sectional view showing the position of the hook 17M with respect to the hook storage container 20a.

First, the wire passage 30 extending from the front plate inclined portion 24 to the stopper 28 must have a dimension that allows the wire 16 to pass therethrough but does not allow the hook 17 itself to pass therethrough. In the hook storage container 20a of FIG. 9, the wire passage 30 is provided as a substantially U-shaped passage. The width L5 of the wire passage 30 is larger than the width L6 (the length in the width direction) of the wire 16 of the hook 17 and smaller than the width L7 (the length in the width direction) of the hook 17 (L6<L5 <L7). In FIG. 9(b), a main hook 17M is shown as the hook 17, and a plurality of wires 16 extend. At this time, the width L6 of the wires 16 is defined as the width of the entire plurality of wires 16 as shown in FIG. 9(b). When one wire 16 extends from hooks 17 and 17S as shown in FIGS. 1 and 8, the diameter of one wire 16 can be the width L6 of wire 16. FIG.

5(b), when the hook 17 is positioned in the storage area A and the boom 14 is lowered, the wire 16 interferes with the front plate inclined portion 24 of the hook storage container. In order to prevent this, it is assumed that the length L8 from the lower end of the wire passage 30 to the bottom plate portion 23 is shorter than the length L9 from the tip of the hacker portion of the hook 17 to the wire extending portion such as the sheave. Good (L8<L9). In FIG. 9, the length L9 is assumed to be the length from the hacker portion to the central shaft portion of the sheave.

Also, the width L10 of the opening 28 of the hook storage container 20a is preferably equal to or greater than the width L11 of the bottom plate portion 23 . This makes it easier to position the hook 17 in the storage area A when storing the hook 17 .

Also, the length L12 of the bottom plate portion 23 is preferably shorter than the length L13 of the hook in the front-rear direction. As a result, as shown in FIG. 5(a), when the hook is positioned in the storage area A, the hook 17 is difficult to maintain an upright posture and tends to fall toward the front plate inclined portion 24 side. Therefore, it becomes possible to perform a series of subsequent operations for engaging the hook 17 with the stopper 28 more favorably. Note that the bottom plate portion 23 may be inclined so that the hook 17 reaching the storage area A can easily fall toward the front plate inclined portion 24 side.

6(a) and 7, when the hook 17 is taken out from the hook storage container, the wire 16 is let out and the hook 17 is engaged with the stopper 28, and then the front plate inclined portion 24 is moved. Slide it to reach the storage area A. At this time, in order to preferably cause the hook 17 to slide along the front plate inclined portion 24, the inclination angle θ1 of the front plate inclined portion 24 preferably has the following relationship (see FIG. 10). In addition, n is the number of multiplication, θ2 is the wire angle based on the front plate sloping plate 24, T is the wire tension, M is the hook mass, μ is the friction coefficient of the slope of the front plate sloping plate 24, and α is the direction of the slope. is the acceleration of the hook.

It should be noted that the hook storage structure according to the present invention is not limited to being realized in a container shape such as the hook storage containers 20 and 20a. For example, as shown in FIG. 11, by bending an elongated frame member 90, a hook storage structure is provided with an inclined portion 92 corresponding to the front plate inclined portion 24 and a stopper 94 provided at the upper end of the inclined portion 92. S2 may be implemented. At this time, a guide structure 98 may be provided so that the hook 17 is guided along the inclined portion 92 of the elongated frame member 90 . The guide structure 98 preferably includes a roller portion 98 a provided on the hook 17 as a guided portion, and a frame guide portion 98 b provided on the inclined portion 92 and serving as a guide portion for guiding the roller portion 98 . That is, in this case, the inclined portion 92 corresponds to a part of the frame guide portion 98b shaped to guide the roller portion 98a provided on the hook 17. As shown in FIG.

Although the representative embodiments and modifications of the present invention have been described above, the present invention is not limited to them. Various substitutions and modifications may be made without departing from the spirit and scope of the invention as defined by the claims of this application. For example, various combinations of arbitrary parts of the above embodiments and modifications are possible.

The hook storage structure according to the present invention can be applied to mobile cranes other than rough terrain cranes. Further, the hook storage structure is not limited to being provided on the swivel base 12, and may be provided at various other locations. In addition, it is preferable that the hook storage structure is visible not only to the outside but also to the inside from the operator in the driver's seat. For example, in the case of the hook storage container 20, the side plate portion 21 and the rear plate portion 25 on the driver's seat side are preferably made of a transparent material or a mesh-like member. Of course, this may apply to the entire hook storage structure.

1, 1A rough terrain crane 10 body frame 11 outrigger 12 swivel base 13 swivel frame upper part 14 boom 16 wire 17 hook 18 cab 20, 20a hook storage container 21, 22 side plate portion 23 bottom plate portion 24 front plate slope portion 26 slope frame 28 stopper 29 opening 30 wire passage 50 controller S1, S2 hook storage structure

Claims (7)

A hook storage structure for storing a hook of a mobile crane,
a sloping portion that is slanted so as to face a tip side of the boom when the boom, which is configured to be at least capable of being raised and lowered with respect to the vehicle body frame of the mobile crane, is in a predetermined first state in which the boom is laid down;
a stopper positioned at the upper end of the ramp and configured to allow the hook suspended by a wire from the boom to be hooked ;
The hook storage structure, wherein the inclined portion is further provided with a wire passage through which the wire connected to the hook can pass when the hook is positioned in the hook storage structure. The inclined portion is configured such that the length from the lower end of the inclined portion to the stopper is longer than the total length of the hook.
The hook storage structure according to claim 1. Further comprising a force relaxation mechanism configured to prevent a force exceeding a predetermined value from being applied to the stopper from the hook,
The hook storage structure according to claim 1 or 2 . The inclined portion is shaped to guide a guided portion provided on the hook.
The hook storage structure according to any one of claims 1 to 3 . a hook storage structure according to any one of claims 1 to 4 ;
a control configured to control movement of the hook relative to the hook storage structure. A method of movement control of the hook for the hook storage structure according to any one of claims 1 to 4 , comprising:
drawing out the wire so as to lower the hook positioned above the storage area on the lower end side of the slope into the storage area;
when the hook is positioned in the storage area, lowering the boom to the predetermined first state while keeping the hook in the storage area;
hoisting the wire until the hook catches the stopper when the boom is in the first predetermined state. paying out the wire to move the hook away from the stopper and along the ramp to the storage area;
raising the boom to a predetermined second state while maintaining the hook in the storage area when the hook is positioned in the storage area;
hoisting the wire to remove the hook from the storage area when the boom is in the second predetermined state;
7. The method of claim 6 .

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