JP3167784B2 - Horizontal jib crane with telescopic jib - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is intended to enlarge the area of a plane for loading and unloading work of a horizontal jib crane used for crane work or the like in a height-restricted area due to the Civil Aeronautics Act, and to improve the efficiency of crane work. In addition, regarding the practical use of a horizontal jib crane with a jib expansion / contraction function, more specifically, when there is a building or the like that hinders the turning of the jib in the work plane area, the jib is temporarily shortened and turned. It relates to specific means and structures for reducing the radius and extending it where it is not obstructed to maximize the working radius.

[0002]

2. Description of the Related Art In recent years, urban development has been carried out mainly around airports, and high-rise buildings are being planned. The height of the crane used is limited.

Hitherto, jib hoisting cranes have been widely used in Japan. However, in this type of crane, the jib is raised when the working radius is to be reduced, so that the jib tip is naturally high, which is not only disadvantageous in the restricted air area, but also for building. Depending on the height, a case that cannot be adopted occurs.

[0004] In order to solve the above problems, a horizontal jib
Divided into multiple jib and telescopic
Into a composite jib that is elastically connected
The horizontal jib crane which changes the arbitrarily is adopted
You. The jib length of the horizontal jib crane can be arbitrarily expanded and contracted.
As a result, the crane height can be minimized and
Obstacles such as buildings existing in the work area
Shorter jib when lane turns are impeded
To avoid obstacles, extend the jib again,
Work while maximizing the swirl area of the
it can. However, with a horizontal jib crane,
Except for the first jib, the other
The jib must be straight and not bent in the vertical direction.
Cannot be smoothly moved.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and in order to solve the above-mentioned drawbacks, an object such as a building existing in a plane area for loading and unloading prevents the crane from turning. The present invention provides a horizontal jib crane that shortens the jib to avoid obstacles and then extends the jib again to maximize the swivel area of the crane and perform the work smoothly. It is in.

[0006]

In order to solve the above-mentioned problems, a horizontal jib crane provided with a telescopic jib according to the present invention has a jib supported on a base and a jib capable of running on rails provided on the jib. In a horizontal jib crane comprising a main trolley to be mounted and a hook suspended from the main trolley and capable of moving up and down by a hoisting means, a compound in which the jib is divided into a plurality of jib and connected to extend and contract freely. The main trolley is mounted on the first jib of the composite jib, and the other jib except the first jib is equipped with a sub trolley that allows the main trolley to be mounted and run freely. To travel on other jib sections and leave the sub trolley to return to the first jib
A horizontal jib crane having a telescopic jib,
Except for the jib, the other jib expands or contracts on either the upper or lower chord
It has a flexible connecting device and a support pin on the other string.
It is characterized by being made .

[0007]

According to the horizontal jib telescopic jib crane of the present invention according to the above-described means, the jib other than the first jib is formed.
Equipped with a stretchable coupling device on one of the chord material or lower chord material,
That it has a structure with a support pin on the other string
Therefore, when expanding and contracting the jib, fix the expansion and contraction of the connecting device.
The jib will not bend vertically and will be straight,
Will be able to move smoothly and smoothly. Multiple jib telescopically connected to form a composite jib so that it can be shortened even when there is a building or other object that hinders the turning of the jib in the crane's cargo handling plane area Thus, turning can be continued while avoiding obstacles by reducing the turning radius.

In addition, since the main trolley is configured to travel with the main trolley mounted on the sub trolley, the hook suspended from the main trolley can be moved horizontally without restriction even when the composite jib is in both extended and retracted states. You can move.

Further, by further increasing the number of jibs constituting the composite jib, the minimum size of the composite jib when shortened can be further reduced. By increasing the sub trolley with the increase in the composite jib, the hook can move horizontally without restriction over the entire area of the composite jib as described above.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The first illustrated apparatus has one end supported on a base 1,
A first jib 21 having the other end supported by the jib support means 4A,
A second jib 22, one end of which is supported by the first jib 21 and the other end of which is supported by the jib support means 4B; a second end of which is supported by the second jib 22, and the other end of which is supported by the jib support means 4C. A third jib 23, a main trolley 6 that can freely travel on a rail provided at the bottom of the first jib 21, index ropes 10 and 11 for running the main trolley 6, and a second jib 2
A sub trolley A91 that can freely travel on a rail provided at the bottom of the second jib 23, a sub trolley B92 that can freely travel on a rail provided at the bottom of the third jib 23, and a third jib 22 Winch 51 for expanding and contracting 23
A winch 52 for extending and contracting the second jib 22 on the first jib 21, a hook 7 for hanging or hanging the luggage under the hanging rope 71 below the main trolley 6, and a base. 1 has a jib stay 2 for supporting the anti-jib side of the jib support means 4A, 4B, 4C.

The winch 51 has a rope 55 for drawing in the third jib 23 and a rope 56 for feeding out the third jib 23.
Is attached, the end of the rope 55 is connected to the third jib 23, and the end of the rope 56 is connected to the third jib 23 via a turning pulley 57 attached to the front end of the second jib 22. Is rotated, the third jib 23 is extended, and inverted to shorten it.

The winch 52 has the same structure as the winch 51, and extends and contracts the second jib 22.

The sub trolley A91 includes a rail 95 having a shape matching the rail provided on the first jib 21, and is connected to the rail end of the first jib 21 by a fixing device 111 (not shown) and stands by.

When the main trolley 6 passes through the first jib 21 and connects to the rail of the sub trolley A91, the fixing device 111 is released at the same time, and the sub trolley A91 is separated from the first jib 21 and is attached to the index rope 10 together with the main trolley 6. It is pulled and runs on the rail of the second jib 22.

Contrary to the above, the sub trolley A91 runs on the rail of the second jib 22 toward the first jib 21,
When the rail end of the sub trolley A91 and the rail end of the first jib 21 collide, the two rails are connected by the fixing device 111, and the main trolley 6 is separated from the rail of the sub trolley A91 and moves on the rail of the first jib 21. It is designed to run.

The sub trolley B 92 is provided with a rail 96 having a shape matching the rail provided on the second jib 22, and a fixing device (not shown) is connected to the rail end of the second jib 22 by 112 to stand by.

When the sub trolley A91 on which the main trolley 6 is mounted passes through the second jib 22 and rides on the rail of the sub trolley B92, the fixing device 112 is released at the same time, and the sub trolley B92 is separated from the rail end of the second jib 22. Then, the main trolley 6 is mounted on the sub trolley A91 and is pulled by the index rope 10 to travel on the rail of the third jib 23.

On the contrary, the sub trolley B92 runs on the rail of the third jib 23 toward the second jib 22,
When the rail end of the sub trolley B92 and the rail end of the second jib 22 collide, the two rails are connected by the fixing device 112 and the sub trolley A91 on which the main trolley 6 is mounted.
Are separated from the rail of the sub trolley B92 and run on the rail of the second jib 22.

The support rope 45 of the jib support means 4C is wound around a winch 47 via a pulley 46 provided at the top of the jib stay 2, and when shortening the second jib 22 and the third jib 23, the winch 47 is used. Is rolled out and extended when extended.

The index rope 10 for moving the main trolley 6 in the direction of the third jib 23 has one end connected to the main trolley 6 and the other end connected to a pulley 64 provided at the tip of the third jib 23.
One end of the index rope 11 for driving the main trolley 6 in the direction of the first jib 21 is wound around the running winch 63 from below the drum via a pulley 65 provided at the top of the jib stay 2. The other end is connected to the trolley 6, and the other end is wound from the upper side of the drum of the traveling winch 63 via a pulley 61 provided on the base 1 and a pulley 62 provided on the top of the jib steering 2. When the running winch 63 is rotated, the index rope 10 is entangled, and the index rope 1
1 is extended, and the main trolley 6 travels in the direction of the third jib 23, and the main trolley 6 is turned by reversing.
It runs in the direction of.

The suspension rope 71 for lifting or suspending the hook 7 has a pulley 73 provided at one end thereof on the hoisting winch 72 and the other end provided at the top of the jib steering 2, a pulley 74 provided on the base 1, After being hooked on a pulley 76 provided on the hook 7 via a pulley 75 provided on the main trolley 6, it is coupled to a tip of the third jib 23 via a pulley 77 provided on the main trolley 6, and is wound up. The hook 7 is lifted by rotating the winch 72 and is suspended by turning the winch 72 upside down.

In the device configured as described above, the first jib 2
When it is desired to shorten the total length of the composite jib constituted by the first, second jib 22 and third jib 23, the winch 51 is inverted as a first step, and the third jib 23 is drawn into the second jib 22. , The winch 47 is rotated, and the support rope 45 is gradually wound so that the third jib 23 maintains the horizontal posture, and the winches 51 and 47 at predetermined positions.
Should be stopped.

Further, when it is desired to further shorten the composite jib, the winch 52 is reversed as a second step, and the winch 52 is retracted while the second jib 22 containing the third jib 23 is retracted in the first step. The supporting rope 45 is rotated so that the second jib 22 maintains a horizontal posture.
As in the first step, the winches 52 and 47 are stopped at predetermined positions to reduce the size to the minimum size. If the user wants to extend the composite jib, the third jig may be operated in the reverse procedure of the above-described second step, and the second jib 22 may be sent out.

Further, when it is desired to further extend the composite jib, the third jib 23 may be sent out by operating as a fourth step in the reverse procedure of the above-described first step.

To move the hook 7 horizontally during crane operation, the traveling winch 63 is operated and the main trolley 6 is moved.
Is moved to a desired position, the hook 7 can follow and reach the desired position. As described above, the main trolley 6 can travel alone on the first jib 21, travels on the second jib 22 while riding on the sub trolley A 91, and on the third jib 23, the sub trolley A 91 carrying the main trolley 6 further moves on to the sub trolley B 92. Therefore, the crane operation can be efficiently performed in both the telescopic state and the telescopic state even in a composite jib configured to be telescopically extensible.

In the above-described embodiment, the composite jib is constituted by the three gibs of the first jib 21, the second jib 22, and the third jib 23. However, when it is desired to further shorten the jib length when the jib is shortened, etc. You may comprise four or more jib. Further, it may be constituted by two.

The second illustrated device shows a structure for bending and stiffening the second jib 22 in the vertical direction.
And a support pin 101 and a connecting device 102.

In this embodiment, the extendable portion of the connecting device 102 is constituted by a hydraulic cylinder 103,
2 is formed so that a position where the rod 2 is bent in the vertical direction and becomes linear is at an intermediate point of the stroke of the hydraulic cylinder 103, and by closing an opening / closing valve 104 of a hydraulic circuit (not shown), The oil in the side hydraulic chamber is made immovable, and the second jib is maintained in a rigid state.

[0029] Also, by releasing the on-off valve 104, without the freely movable rod side and oil in the hydraulic chamber of the counter-rod side of the hydraulic cylinder 103, the second jib 22
Can be freely bent up and down,
The second jib 22 is connected to the jib support means 4B and the support pin 101.
And without the support Ru both ends supporting beam structure we're in.

In the apparatus configured as described above, the second jib 2
When the second jib 22 is expanded and contracted,
The opening and closing valve 104 is closed at a position where the second jib 22 is straightened, and the second jib 22 is stiffened in a straight line to form a single body, so that the inside of the first jib 21 can be smoothly moved.

Further, by opening and closing the opening / closing valve 104 and performing the cargo handling work by forming the second jib 22 into a support beam structure at both ends, the bending moment generated in the second jib 22 is reduced, and the weight of the equipment can be reduced. Can be

The hydraulic cylinder 1 of the connecting device 102
A pressure detector 105 (not shown) is attached to the rod side and the counter rod side of the valve 03, and the on-off valve 104 is closed so that the second jib 22 is in a rigid state, and the load acting on the second jib 22 is detected. The tension of the jib support means 4C is adjusted to an appropriate value so that the second jib 22 can be safely extended and contracted without imposing an abnormal force.

In this embodiment, the pressure detector 105 is used as a device for detecting the load acting on the second jib 22, but a load cell or the like may be used instead.

[0034]

According to the horizontal jib crane provided with the telescopic jib according to the present invention as described above, the telescopic movement of the composite jib can be performed in a telescopic telescopic construction .
The operation can be performed smoothly and the efficiency of the crane operation can be improved. Also the bending moment on the jib
Equipment can be lightened, and manufacturing costs can be reduced.
This will reduce the cost. In addition, abnormal force is applied to the jib
It is possible to work in a safe state without any trouble.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a trolley structure for a telescopic jib of a horizontal jib crane according to the present invention.

FIG. 2 is a partial structural view showing an embodiment of a jib protection device.

FIG. 3 is a three-dimensional view of an embodiment showing a relationship between a composite jib and a main trolley and a sub trolley.

FIG. 4 is a plan view showing an example of a cargo handling work plane area of the crane.

FIG. 5 is a side view showing a state where the composite jib is shortened.

[Explanation of symbols]

 1 base 2 base jib 4A, 4B, 4C jib support means 10 index rope 6 ···· Main trolley 91 ····· Sub trolley A 92 ······ Sub trolley B 7 ························································· First ... The second jib 23... The third jib 102... The coupling device 51, 52... The jib expansion and contraction means 71. ..... Suspension ropes

Claims (3)

(57) [Claims] 1. A jib supported by a base, a main trolley mounted on a rail provided on the jib, and a hook suspended from the main trolley and movable up and down by a hoisting means. made, the jib is formed into a plurality of divided jib and telescopically connected the composite jib, the main trolley is equipped with a first jib of the composite jib, first-di
Except for the jib, the other jib is equipped with a sub trolley that allows the main trolley to be mounted and run freely, and the main trolley rides on the sub trolley and travels on other jib sections and leaves the sub trolley and returns to the first jib With a telescopic jib configured to
Other horizontal jib crane except for the first jib
A coupling device that allows the jib to expand or contract to one of the upper and lower chords
And the other string is provided with a support pin.
Horizontal jib crane with a telescopic jib, characterized in that that. 2. A horizontal jib crane with a telescopic jib of claim 1, wherein said said coupling device to a load detection device is equipped. 3. A negative detected in the detection device of the load
Depending on the load , adjust the tension on the jib support to an appropriate value.
Section, and a horizontal jib crane with a telescopic jib according to claim 2, wherein the expanding and contracting the other jib except first jib.