JP2931274B2 - Overhead traveling crane - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overhead traveling crane, and more particularly to an overhead traveling crane used for transporting an object to be plated in a plating factory.

[0002]

2. Description of the Related Art Conventionally, an overhead crane has been used in a plating factory to transport an object to be plated.
The overhead crane includes, for example, a trolley movably supported in a lateral direction along a trolley frame, and a hook block that moves integrally with the trolley and conveys an object to be plated (object to be conveyed). There are known a rope trolley type in which a trolley is moved by a wire rope, and a self-propelled type in which a traveling wheel of a trolley is driven by a motor mounted on the trolley. The hook block is moved up and down by a wire rope connected to the winch, so that the hook that suspends the object to be plated is moved up and down.By the lateral movement of the trolley and the up and down movement of the hook, An object to be plated can be automatically immersed in a plurality of processing tanks.

[0003]

However, in the conventional overhead crane, when the moving trolley is stopped, the hook block swings due to its inertia force, and the object to be plated suspended on the hook block is accommodated. It takes about one minute for the container to shake out and completely stop. In particular, when the vertical distance (head) from the hook portion to the object to be plated is large, the lateral run-out is further increased, and the plating solution adhering to the object to be plated is scattered to the surroundings, and it is difficult for the operator. Or corrode factory floors. For example, in the case of hot-dip galvanizing, since the plating solution has reached a high temperature (for example, 480 ° to 520 °), it is indispensable to prevent lateral runout of the object to be plated in order to ensure the safety of work. Conventionally, at the time of stopping the trolley, a plurality of workers use a bar-shaped stopper to stop the container housing the object to be plated, which requires a great deal of labor and labor. . In addition, it is conceivable to stop the trolley gently so that the plating solution does not fly. However, in this case, the moving speed of the trolley becomes slow, and another problem occurs in that the operation is delayed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides an overhead crane having a simple structure and capable of preventing a lateral movement of a transferred object when a moving trolley is stopped. It is another object of the present invention to provide an overhead crane which can sufficiently cope with a change in a vertical distance (head) from a hook portion to a conveyed object.

[0005]

In order to solve the above-mentioned problems, the present invention provides a trolley 2 movably supported in a lateral direction along a trolley frame 3, and a trolley 2 which moves integrally with the trolley 2 to be transported. In an overhead crane provided with a hook block 4 for transporting an object, a wheel 5 is provided above the hook block 4, and the wheel 5 supports the wheel 5 of the hook block 4 movably below the trolley 2. A steady rail 6 having a surface 7 is provided, and the wheel running surface 7 of the steady rail 6 is gently inclined in a substantially V-shape along the traveling direction A of the trolley 2 so that the lateral deflection of the transferred object is achieved. With this configuration, when the moving trolley 2 is stopped, the wheels 5 provided on the hook block 4 run on the rails 6 for the steady rest. Since it moves along the 7, hook block 4 can move laterally while substantially maintaining the vertical position, thereby preventing the occurrence of runout side of the transported object. Moreover, since the wheel running surface 7 of the steady rail 6 is gently inclined in a substantially V-shape, the moving speed of the wheel 5 is gradually reduced, and the wheel 5 returns to the center position of the wheel running surface 7 naturally. The hook block 4 comes to a standstill in a relatively short time.

Here, the steady rail 6 is formed by rotatably connecting one end portions 8a, 9a of two rail members 8, 9, and the height of a connecting portion 10 of the rail members 8, 9 is set. It is preferable to adjust the angle of each of the rail bodies 8 and 9 by adjusting the angle. In this case, by adjusting the angle of the rail bodies 8 and 9, the vertical distance from the hook portion to the object to be conveyed is adjusted. It is possible to sufficiently respond to changes in (head).

The hook block 4 includes a wheel supporting portion 11 for supporting the wheels 5 and a hook portion 1 for suspending an object to be transported.
2 are connected up and down, and the hook 12 is
Is preferably connected rotatably in a direction B perpendicular to the traveling direction A. In this case, even if the trolley 2 sways in the direction B perpendicular to the traveling direction A, the hook portion 12 remains in the same direction. By being able to rotate, the lateral swing of the trolley 2 is canceled, and the occurrence of the lateral swing in the direction B orthogonal to the traveling direction A can be prevented.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below. Generally, a plating factory is provided with a plating pretreatment chamber for handling a plating solution such as an acid, and a plating chamber for plating an object to be plated. The plating pretreatment chamber performs pretreatment of the object to be plated. Degreasing tank, degreasing washing tank,
An acid pickling tank, a water washing tank, a flux tank and the like are provided, and a plating tank is provided in the plating chamber. Then, the object to be plated is sequentially transported to each tank using the overhead crane 1 of the present embodiment, and the immersion work in each tank is automatically performed. The immersion of the object to be plated into the plating tank is mainly performed by a robot. However, it is of course possible to perform the immersion operation into the plating tank using the overhead crane 1 of the present embodiment.

In this embodiment, as the overhead crane 1,
The rope trolley type crane which runs the trolley 2 with a wire rope is illustrated. As shown in FIGS. 1 and 2, the rope-trolley type crane
Trolley frame 3 made of a shape steel, etc., and trolley frame 3
A trolley 2 movably supported in the lateral direction along the trolley 2, a hook block 4 for moving integrally with the trolley 2 and transporting an object to be plated, and a hook block 4 provided below the trolley 2 The main body is composed of a steady rail 6 provided with a wheel running surface 7 for supporting the wheels 5 in the same direction as the running direction A of the trolley 2.

A pulley (not shown) is provided at one end of the trolley frame 3, and a forward / reverse rotation type motor (not shown) is provided at the other end. The pulley extends between the pulley and the motor drive shaft. An endless trolley wire rope 13 is wound.
The trolley wire rope 13 is rotationally driven in a forward or reverse direction by a motor. At both ends of the trolley 2, as shown in FIG. 1, rope connecting portions 2a, 2a connected to the lower portion 13a of the trolley wire rope 13 are provided, whereby the trolley 2 is connected to the trolley wire rope 1.
3 so that it can reciprocate integrally with the lower portion 13a. The trolley 2 includes a running surface 3 of a trolley frame 3.
traveling wheel 15 supported so as to be able to travel laterally along a
And a wheel 16 for preventing the trolley from slipping off the upper part 13b of the trolley wire rope 13 from the front and rear. Prevention wheel 16
The trolley 2 can be prevented from coming off the upper part 13b of the trolley wire rope 13 by this,
Stable movement is realized. The trolley wire rope 13 can be stopped by a brake device (not shown), so that the trolley 2 can be stopped at a desired position.

As shown in FIG. 3, a steady rest having a wheel running surface 7 below the trolley 2 supports a wheel 5 of a hook block 4 to be described later in the same direction as the running direction A of the trolley 2, as shown in FIG. Rail 6 is provided. The wheel running surface 7 of the steady rail 6 is gently inclined in a substantially V shape along the running direction A of the trolley 2. In this embodiment,
The steady rail 6 is constituted by rotatably connecting one end portions 8a and 9a of two rail bodies 8 and 9. The other end portions 8b, 9b of the two rail bodies 8, 9 are rotatably fixed to rail receiving portions 17, 17 provided on both lower surfaces of the trolley 2, respectively. Further, as shown in FIG. 3, the connecting portion 10 of the one end portions 8a, 9a of the two rail bodies 8, 9
The connecting portion 10 is vertically movable along a vertical guide groove 40 provided in the frame 41, and the height of the connecting portion 10 is freely adjustable by the height adjusting means 18.

The height adjusting means 18 includes two rails 8,
9 for adjusting the inclination angle θ of the trolley 2, and is composed of, for example, an adjuster bolt 18 a that vertically passes through a through hole 27 provided in the lower surface at the center of the trolley 2. An adjusting nut 18b is screwed into the upper end of the adjuster bolt 18a, and the lower end is connected to the connecting portion 10 of the two rails 8,9. By rotating the adjustment nut 18b, the adjuster bolt 18a moves up and down,
In conjunction with this, the connecting portion 10 of the two rail bodies 8 and 9 can move up and down, and the angle adjustment of the rail bodies 8 and 9 is performed. Here, the other ends 8 of the two rail bodies 8, 9
b, 9b are rail receiving portions 17, 17 of the trolley 2 (FIG. 3)
In order to make the connecting portion 10 of the one end portions 8a, 9a of the two rail bodies 8, 9 vertically movable, the length of the two rail bodies 8, 9 can be adjusted. Need to be For example, one end 8 of one of the rails 8 and 9
a, 9a is provided with an elongated hole (not shown) in the lateral direction, and one end 8a, 9a of the other rail body 8, 9 is provided.
Is provided with a connecting shaft (not shown) which slide-fits into the elongated hole, and the connecting shaft is slidably fitted into the elongated hole, thereby connecting the two rail bodies 8, 9 in a freely adjustable length. It is possible. Of course, the lengths of the two rail bodies 8 and 9 may be changed by other methods.

On the other hand, the hook block 4 includes a wheel 5 supported on the wheel running surface 7 of the steady rest rail 6 so as to be able to travel, a wheel supporting portion 11 for supporting the wheel 5, and a hook for suspending an object to be plated. And a unit 12. As shown in FIG. 4, the wheel support portion 11 is connected to a wheel shaft 19 that rotatably supports the wheel 5, a vertical axis 20 hanging from a central portion of the wheel shaft 19, and a lower end of the vertical axis 20. And a sheave mount 22 for rotatably supporting the upper sheave 23.

As shown in FIGS. 5 and 6, the wheels 5 are arranged along the traveling direction A of the trolley 2. In this embodiment, the wheels 5 are composed of two front and rear wheels 5, and each wheel 5 Are able to travel along the steady rail 6. The sheave fixture 22 includes two front and rear upper sheaves 23.
Are rotatably supported. Between the sheave attachment 22 and the longitudinal axis 20, the sheave attachment 22 is rotatably supported in the front-rear direction with respect to the wheel shaft 19, that is, in the direction B (FIG. 4) orthogonal to the traveling direction A of the trolley 2. Rotating shaft 21 for
When the sheave attachment 22 is rotated in the front-rear direction, the hook 12 is also rotatable in the front-rear direction.
Has a structure capable of canceling the lateral vibration in the front-rear direction.

On the other hand, as shown in FIGS. 1 and 2, the hook portion 12 includes a hanging metal 25 for rotatably supporting the lower sheave 24, and a single hook 26 provided at a lower end of the hanging metal 25. Consisting of The elevating wire rope 14 is wound in a headband shape from the lower sheave 24 to the upper sheave 23, and one end of the elevating wire rope 14 is fixed to, for example, one end side (pulley side) of the trolley frame 3. The other end of the wire rope 14 is connected to a winch (not shown) in the machine room installed on the other end side of the trolley frame 3, and the hoisting wire rope 14 is wound up or down by the winch. As a result, the lower sheave 24 is raised or lowered, and the one hook 26 provided at the lower end of the hanging fitting can be moved up and down. The upper limit position and the lower limit position of the hook 12 are controlled by a limit switch. In addition, it goes without saying that both hooks may be used instead of the one hook 26.

When the overhead crane 1 having the above configuration is operated, the one hook portion 2 of the hook block 4 is operated.
6, the container accommodating the object to be plated is suspended, and the lifting wire rope 14 is wound up by the winch of the machine room, so that the lower sheave 24 of the hook block 4 is lifted, and the object to be plated can be lifted. The trolley 2 can be started by rotating the trolley wire rope 13 by a motor. Then, after the moving trolley 2 is stopped, the lifting wire rope 14 is wound down by a winch.
The lower sheave 24 moves down, and the object to be plated can be immersed in a desired treatment tank. In this way, by repeatedly repeating the operations of hoisting the elevating wire rope 14 → driving the trolley wire rope 13 → stopping the trolley wire rope 13 → lowering the elevating wire rope 14, a plurality of objects to be plated are obtained. Can be sequentially immersed in the processing tank.

Here, when the moving trolley 2 is stopped, the wheels 5 of the hook block 4 are moved to the steady rails 6.
Along the wheel running surface 7 in the direction in which the inertial force is applied. That is, even if the trolley 2 stops, the wheels 5 of the hook block 4 can travel along the wheel running surface 7 of the steady rail 6, so that the upper wheel support 11 and the lower hook of the steady rail 4 can be moved. The portion 12 can move in the same direction and at the same pitch, so that the entire hook block 4 can move in the horizontal direction while maintaining a substantially vertical posture, and the object to be plated can be moved laterally (load deflection). Disappears.
In addition, the wheel running surface 7 on which the wheel 5 runs has a gentle V
Since the wheel 5 is fully inclined and the whole load of the hook block 4 including the object to be plated is applied to the wheel 5, the moving speed of the wheel 5 is gradually reduced, and the wheel 5 is moved in a short time on the wheel running surface. 7 and the hook block 4 is at rest. The hook portion 12 of the hook block 4 is rotated by a rotation shaft 21 provided on the wheel support portion 11.
Since the trolley 2 is rotatable in the direction B (FIG. 4) orthogonal to the traveling direction A of the trolley 2 with respect to the wheel supporting portion 11, when the moving trolley 2 is stopped, the trolley 2 moves with the traveling direction A. Even if the trolley 2 rotates in the front-rear direction even if the trolley 2 rotates in the front-rear direction even when the trolley 2 rotates in the orthogonal direction B, the object to be plated no longer sways in the front-rear direction. In addition, not only when the trolley 2 is stopped, but also when the trolley 2 is moved, the wheels 5 of the hook block 4 can have a steadying effect by the steadying rails 6.

As a result, with a simple structure in which the anti-sway rail 6 is provided below the trolley 2, the occurrence of lateral run-out of the plating object can be prevented, so that the plating solution attached to the plating object scatters around. It is possible to solve the problem that the plating solution is applied to the worker and the floor of the factory is corroded without fear. In particular, even when the plating solution has reached a high temperature (for example, 480 ° to 520 °), such as hot-dip galvanizing, it is possible to secure the work safety by preventing the object to be plated from swaying. As described above, it is not necessary for a plurality of workers to stop the container housing the object to be plated by using the bar-shaped stopper, so that the labor of the workers can be reduced. In addition, since it is not necessary to stop the trolley 2 quietly so that the plating solution does not fly, the moving speed of the trolley 2 can be increased to speed up the operation.

When the vertical distance (head) from the hook portion 12 to the object to be plated is large, the inclination angle of the two rail members 8, 9 is adjusted by the adjuster bolt 18a so that the inclination angle is increased. , If the lift is small,
Two rail members 8, 9 are provided by adjuster bolts 18a.
By adjusting so that the inclination angle of
It is possible to sufficiently cope with changes in the head.

Here, the head was set within a range of 6 m to 15 m, the maximum load was set to 27.5 kN (2.8 t), and the inclination angle of the steady rail 6 was adjusted according to the traveling speed and the head. The results shown in Table 1 were obtained.

[0021]

[Table 1]

According to the results shown in Table 1, it is known that, in the related art, when the trolley is stopped, it takes about 1
In contrast, it took about 21 minutes to use the steady rest rail of the present invention, which was about 21 seconds or less. Was. In the above-described embodiment, a rope trolley-type crane in which the trolley 2 travels with the trolley wire rope 13 has been exemplified. However, the present invention is not limited to this. For example, as shown in FIGS. A so-called self-propelled crane, in which a trolley 2 is driven by driving a traveling wheel 15 supported movably along the traveling surface of the trolley frame 3 by mounting a motor 30 on the Applicable. As shown in FIG. 8, the upper sheave 23 has two sheaves 23 on the left and right, which are arranged shifted in the front-rear direction.
There is also an advantage that the stability when the hook block 4 is raised and lowered can be further improved.

The overhead crane 1 of the present invention can be widely used not only for a plating plant but also for transporting articles other than a plating object.

[0024]

As described above, according to the first aspect of the present invention, the trolley supported movably in the lateral direction along the trolley frame, and the object to be transported by moving integrally with the trolley. Overhead crane provided with a hook block for transporting the wheels, a wheel provided above the hook block, and a wheel running surface for supporting the wheels of the hook block movably below the trolley. A rail is provided, and the wheel traveling surface of the steady rest rail is inclined in a gentle V-shape along the traveling direction of the trolley to prevent lateral vibration of the transferred object, so that the traveling trolley can be moved. When stopped, the wheels provided on the hook block can move along the wheel running surface of the steady rail, and the hook block can move laterally while maintaining a substantially vertical posture. In, it can be prevented from occurring swing next to the object to be conveyed. Moreover, since the wheel running surface of the rail for steadying is inclined in a gentle V-shape, the moving speed of the wheel is gradually reduced, the wheel naturally returns to the center position of the wheel running surface, and the hook block is compared. It comes to rest in a very short time. As a result, with a simple structure of providing the steady rest rail below the trolley, it is possible to prevent the occurrence of lateral run-out of the transported object. There is no danger of the plating solution splashing around, preventing the plating solution from hitting the workers and corroding the factory floor, and it is not necessary to stop the trolley gently. The speed can be increased to speed up the work.

According to a second aspect of the present invention, the steady rail according to the first aspect is configured by rotatably connecting one ends of two rails, and a height of a connecting portion of the rails. The angle of each rail is adjusted by adjusting the angle of the rail. In addition to the effect of claim 1, by adjusting the angle of the rail, the vertical distance (from the hook portion to the object to be conveyed) is adjusted. It is possible to obtain an overhead crane that can sufficiently cope with a change in head.

According to a third aspect of the present invention, in the hook block according to the first aspect, a wheel supporting portion for supporting a wheel and a hook portion for suspending an object to be transported are vertically connected, and the hook portion is a wheel. Since the trolley is connected so as to be rotatable in the direction perpendicular to the traveling direction of the trolley, even if the trolley swings in the direction perpendicular to the traveling direction when the trolley stops, in addition to the effect of claim 1, By being able to rotate in the same direction, the sway of the trolley is canceled out, which is more effective in preventing the occurrence of the sway.

[Brief description of the drawings]

FIG. 1 is a front view showing an example of an embodiment of the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is an explanatory view of a steady rail according to the first embodiment;

FIG. 4 is a cross-sectional view of the above hook block.

FIG. 5 is an explanatory diagram of wheels of the hook block.

FIG. 6 is an explanatory diagram of a wheel support unit according to the embodiment.

FIG. 7 is a front view of another embodiment.

FIG. 8 is an explanatory diagram of wheels of the hook block of FIG. 7;

FIG. 9 is an explanatory view of the wheel support section of FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 overhead crane 2 trolley 3 trolley frame 4 hook block 5 wheel 6 rail for steadying 7 wheel running surface 8, 9 rail body 8a, 9a one end 10 connecting part 11 wheel support part 12 hook part A trolley running direction B trolley Direction perpendicular to running direction

Claims (3)

(57) [Claims] An overhead crane having a trolley supported movably in the lateral direction along a trolley frame and a hook block for moving integrally with the trolley and transporting a load. Wheels are provided at the top, and a rail for steadying is provided below the trolley with a wheel running surface that supports the wheels of the hook block so that the wheels can travel freely. An overhead crane characterized in that the object is prevented from laterally swaying by being inclined in a gentle V-shape along the line. 2. The rail for steadying is constructed by rotatably connecting one end of two rails, and adjusting the angle of each rail by adjusting the height of the connecting portion of the rails. The overhead crane according to claim 1, wherein the overhead crane is operated. 3. A hook block, wherein a wheel supporting portion for supporting a wheel and a hook portion for suspending an object to be transported are vertically connected, and the hook portion is rotatable in a direction orthogonal to the traveling direction of the wheel. The overhead crane according to claim 1, wherein the overhead crane is connected.