JPH024508B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a wheel unit for a crane.
In particular, the present invention relates to a mechanism for ensuring the safety of a crane wheel unit.

[Conventional technology]

The conventional wheel unit for cranes is
As disclosed in Publication No. 33381, in order to equalize the load applied to the two wheels of the wheel unit, a horizontal shaft is provided in the center of the outer body (wheel casing) that supports the wheels, and a horizontal shaft is provided in the center of the outer body (wheel casing) that supports the wheels. The saddle frame of the crane and the outer body were connected through the attached connecting metal fittings.

[Problem to be solved by the invention]

However, such a wheel unit has two
There was no consideration to stop the crane urgently if one of the wheels was damaged.

In particular, wheel units employing resin-based wheels are said to have an extremely high frequency of breakage due to overload or deterioration, so safety measures are of the utmost importance. In addition, in the case of resin-based wheels, in order to reduce the load conditions on the wheels as much as possible, so-called trackless cranes are often used, which use H-beam steel, etc., as the running tread material, which can have a large running tread. Travel guidance is provided by side rollers provided on the body.

Therefore, when one of the wheels in the swinging configuration breaks at the resin part or reaches the end of its life, the frame supporting the wheel tilts and the side rollers attached to the frame come off the running tread. It was thought that the guide function would be lost, and as a result, the crane would come off the running tread and fall into an accident, so it was desired to take a safety measure that would provide a function to stop the crane in the event of a wheel breakage.

The present invention has been made in view of the above points, and its purpose is to provide a simple structure and rational arrangement and combination of swingable components to prevent wheel damage or abnormal wear. To provide a wheel unit for a crane which is highly safe and ensures the suspension of crane travel when the crane moves.

[Means to solve the problem]

The present invention is configured as follows to achieve the above object. Hereinafter, in order to facilitate understanding of the content of the present invention, the embodiments will be described with reference to the reference numerals of FIGS. 1, 3, 4, and 7.

That is, the present invention is a wheel unit attached to a saddle frame 4 of a crane, through which the crane travels on a traveling tread 8. The wheel unit includes a frame 9 and a frame 9. It comprises two wheels 10, 11 that are supported by the wheels and are spaced apart in the running direction, and a connecting fitting 15, etc., and a shaft 28 supported by the frame is passed between the wheels 10, 11. On the other hand, the connecting fitting 15 has a mounting plate 17 fixed to the saddle frame 4, and support plates 16A and 16B that are vertically installed at the bottom of this mounting plate. 15 is swingably attached to the shaft 28 between the wheels 10 and 11 to connect the saddle frame 4 and the frame body 9, and the frame body 9 is designed to prevent one of the wheels 10 and 11 from collapsing or abnormal wear. When such occurrence occurs, the connecting fitting 15 tilts around the shaft on the other normal wheel side, and due to this inclination, the connecting fitting 15 forms a mechanism in which it falls downward via its mounting shaft 28, and the mounting plate 17 of the connecting fitting 15 and Support plate 16
At least one of A and 16B is partially attached to each wheel 1.
located above the outer diameter portions of wheels 0 and 11 and facing each other while maintaining distances 29A and 29B from the outer diameter portions of the wheels;
The dimensions of these opposing spaces 29A and 29B are set so that the amount of depression of the connecting metal fitting 15 exceeds a set value.
The set amount of depression in No. 5 is determined based on the amount of depression when one of the wheels 10, 11 is extremely crushed or abnormal wear occurs and the frame body 9 tilts in an unsafe manner.

[Effect]

According to the present invention having such a configuration, when the wheels 10 and 11 are in normal condition, the distance between the outer diameter portions of these wheels and the opposing portion of the connecting fitting 15 is
29A and 29B are maintained. Therefore, by driving the wheels, the wheel unit, and by extension the entire crane, can be moved on the running tread 8. In this case, since the connecting fitting 15 is swingably supported by the frame body 9 via the shaft 28, even during normal running, the frame body 9 may be damaged due to unevenness of the running tread material 8, seam steps, etc. and the connecting fittings 15 perform a relatively small tilting motion, but since this tilting is within the allowable range, each wheel 1
The opposing distances 29A and 29B of the connecting fitting 15 to the outer diameter portions of 0 and 11 are sufficiently maintained.

Next, when one of the wheels 10, 11 is crushed or abnormally worn, the following operation is performed.

For example, as shown in FIG. 4, when the wheel 10 is crushed, the frame body 9 tilts around the axis 13 of the normal wheel 11 due to the crane's own weight, the weight of the suspended load, etc. Following this frame body tilting movement, a connecting fitting attachment shaft 28 supported by the frame body 9
falls downward, and following this, the connecting fitting 1
5 also falls by an amount equivalent to axis 28. Here, this series of operations will be explained in detail with reference to FIG. In addition, in FIG. 7, the saddle frame 4 and the frame body 9 are omitted from illustration.

As mentioned above, when the frame 9 tilts around the shaft 13 of the wheel 11 due to the crushing of the wheel 10, the position of the shaft 12 of the wheel 10 shifts from Q to Q' due to the crane's own weight and the weight of the suspended load. Move to. In other words, the frame body 9 is tilted by ∠QPQ' when the shaft 13 is pivoted P. Due to this inclination, the connecting fitting 15 attached to the frame 9 via the shaft 28 also follows, ∠
The angle is rotated by ∠RPR′, which is the same angle as QPQ′, and the axis 28 is
It falls downward by a distance of RR′. Therefore, the support plates 16A, 16B and the mounting plate 17, which are the constituent members of the connecting fitting 15, also have a depression amount equivalent to the depression amount RR'.
SS′ and TT′ fall downward.

In the present invention, when such depression occurs, a portion of the connecting fitting 15 comes into contact with at least one of the wheel outer diameter portions 30A and 30B because the present invention includes the following elements. That is, at least one of the mounting plate 17 and the support plates 16A, 16B of the connecting fitting 15 is placed between the outer diameter part of each wheel 10, 11 while a part thereof is located above the outer diameter part of the wheel.
A, 29B are kept facing each other, and the distance between these opposing parts 29A, 29B is set so that the amount of depression of the connecting metal fitting 15 will disappear when it exceeds a set value, and the set amount of depression of this connecting metal fitting 15 is set. are determined based on the depression amounts R and R' when one of the wheels 10 and 11 is extremely crushed or abnormally worn and the frame body 9 tilts in an unsafe manner. Part of is between opposite sides〓
29A and 29B are eliminated, and the wheel contacts the outer diameter portion of the normal wheel 11 side. And in this contact part,
Since the crane's own weight and hanging load are applied, the connecting fittings 15 come into pressure contact with the outer diameter portions 30A and 30B of the wheels, and this pressure contact causes a braking action to stop the rotation of the wheels, making it possible to make an emergency stop of the crane. becomes.

〔Example〕

Embodiments of the present invention will be described based on the drawings.

Fig. 1 is a partially exploded perspective view of a wheel unit for a crane according to an embodiment of the present invention, Fig. 2 is an overall perspective view of an erected crane with the wheel unit attached to the crane, and Fig. 3 is the above-described The wheel unit is attached to the saddle frame in normal use. Figure 4 is an explanatory diagram of the wheel being damaged. Figure 5
The figure is a partial enlarged cross-sectional view showing the composition of the resin material of the wheel and the load condition, Figure 6 is a partial enlarged cross-sectional view also showing the damaged state, and Figure 7 is a part showing details of the operating state of Figure 4. It is an abbreviated explanatory diagram.

First, the overall configuration of the trackless overhead crane 1 in this embodiment will be explained with reference to FIG.

The crane 1 is a girder 3 that suspends a hoist 2.
Saddle frames 4 and 5 are connected to both ends of the saddle frames 4 and 5, and wheel units 6A, 6B, 7A and 7B are attached to both ends of these saddle frames 4 and 5, respectively. It is installed on the provided running tread member 8 via wheel units. The constructed crane 1 travels over the entire length of the road surface of the traveling tread material 8 inside the building by operating a push button (not shown).

Next, the configurations of the wheel units 6A, 6B, 7A and 7B will be explained. Here, since the wheel unit 6A and the other wheel units 6B, 7A and 7B have the same construction, the wheel unit 6A will be explained with reference to FIGS. 1, 3 to 7.

As shown in FIG. 1, the wheel unit 6A is composed of a frame 9, two wheels 10, 11, a connecting fitting 15, and the like.

The frame body 9 includes a pair of support members 19 having a U-shaped cross section.
A rectangular side plate 20 spanning both ends of A and 19B.
and 21 are welded and fixed to form a rectangular frame as a whole. Within this frame, driving wheels 10 and driven wheels 11 are arranged with an interval in the running direction, in other words, in the front-back direction, and these wheels 10, 1
1 connects shafts 12 and 13 through bearings (not shown).
It is attached to the frame body 9 by a key plate (not shown) and is fixed to prevent it from coming off.

The driving wheels 10 are driven by a gear motor 25 attached to the support member 19A of the frame 9.

At the center of the support members 19A and 19B in the frame body 9, shaft holes 14A and 14B are provided correspondingly between the driving wheel 10 and the driven wheel 11, and a shaft 28 is provided between the shaft holes 14A and 14B. passes through the shaft 28, and a connecting fitting 15 described below is swingably attached to this shaft 28.

The connecting fitting 15 is connected to the mounting plate 17 and the mounting plate 1.
Two supporting plates 16A and 16B are arranged on the lower surface of the mounting plate 7 so as to be perpendicular to the mounting plate, and these members 17, 16A and 16B are welded together. Support plates 16A and 16B are arranged parallel to each other,
This support plate 16A, 16B has shaft holes 18A, 18B.
will be placed. Such a connecting fitting 15 can be assembled by inserting a bolt into the connecting hole 22 of the mounting plate 17 and attaching the third
As shown in the figure, it is fixed to the saddle frame 4 via a mounting plate 17. On the other hand, the support plates 16A and 16B are inserted between the support members 19A and 19B of the frame 9, and the shaft holes 18A and 18B are aligned with the shaft holes 14A and 14B, so that the shaft 28 is inserted into these shaft holes. Ru. That is, a connecting metal fitting 15 is attached to the shaft 28 so as to be able to swing relative to the frame body 9, and the pair of frames 9 and the saddle frame 4 are connected via this connecting metal fitting 15. The shaft 28 is fixed to the frame 9 with a key plate 23 so as not to come off, and the key plate 23 is tightened and fixed with a bolt 24.

In this way, the connecting fitting 15 is swingably supported by the shaft 28 interposed between the driving wheel 10 and the driven wheel 11, but in this embodiment, the lower surface of the mounting plate 17 of the connecting fitting 15 is and support plate 16
Both edges of wheels 10 and 16 are opposed to the outer diameter portions of wheels 10 and 11 via holes 29A and 29B. In the case of the mounting plate 17, these portions facing the outer diameter portion of the wheel are naturally positioned above and opposite to the outer diameter portion of the wheel, but the portions facing the support plates 16A, 1
6B also has a sloped edge that widens upward on its upper side, and these sloped edges are disposed opposite to each other so as to be located above the outer diameter portion of the wheel.

The opposing distances 29A and 29B are set so that the distance disappears when the inclination of the frame body 9 exceeds a set permissible value that causes a lack of crane running safety. This mechanism will be described later.

Here, the operation of the wheel unit of this embodiment will be explained.

As shown in FIG. 3, the drive wheels 10 are driven by the rotational force of the gear motor 25 via the final stage gear 31, and run on the running tread material 8. Along with this, the driven wheels 11 also follow the movement. As these wheels travel, the wheel unit itself also travels while being guided by side rollers 26 provided on the side plates 20 of the frame 9.

The cushioning material 27 provided on the side plate 20 of the frame body 9 alleviates the impact when the crane collides with the end of the running tread.

Therefore, the driving wheels 10 and the driven wheels 11
When both wheels 10,
29A, 2 between the opposing fittings 15 and 11
9B is retained. In addition, relative rocking (tilting) occurs between the frame body 9 and the connecting fittings 15 due to irregularities on the running tread material 8 and differences in joints that occur during normal running, but since the tilt is within the allowable range, the above-mentioned The opposing distances 29A and 29B are sufficiently secured.

The load state of the driving wheels 10 and the driven wheels 11 is determined by the loads caused by the load lifted by the hoist 2 (not shown), the weight of the girder 3, the weight of the saddle frame 4, etc. acting on the connecting fittings 15, The connecting fitting 15 that has received these loads is fixed to the frame 9 at the center between the driving wheel 10 and the driven wheel 11, so that the mounting shaft 12, 13 is The load is equally distributed between the driving wheels 10 and the driven wheels 11.

By the way, the rotational force from the gear motor 25 acts only on the drive wheel 10 side, and the motor rotational force does not act on the driven wheel 11 because it is driven.
Therefore, the driving wheels 10 are subjected to a vertical load and rotational force at the same time, and are therefore forced to run more severely than the driven wheels 11, which receive only vertical loads, and are disadvantageous in terms of durability.

Next, the structure and operation of the resin wheel will be explained with reference to FIGS. 5 and 6.

Since the driving wheels 10 and the driven wheels 11 have the same configuration, the driving wheels 10 will be explained.

In the driving wheel 10, a resin material 34 such as urethane rubber is fixed to the outer periphery 33 of the iron core 32 by adhesive or the like. The reason for using the resin material 34 is to reduce noise when the crane travels and to absorb the vibrations.

The mounting shaft 12 is mounted on the drive wheel 10 using the running tread material 8.
5, the load P in FIG. 5 acts as a reaction force at the contact portion between the running tread material 8 and the resin material 34, and the resin material 34 is crushed, causing transforms into Deformation of each part of the outer periphery of the resin material 34 occurs continuously at a rate of once per rotation of the wheel while the crane is running. As deterioration progresses, cracks and internal cavities 36 shown in FIG. 6 occur, leading to damage. especially,
The generation of the internal cavity 36 causes extreme deformation, resembling a so-called flat tire, and resulting in a resin outer shape 37.

In this way, the drive wheel 1 of the wheel unit 6A
0, if the time for wheel replacement is missed due to overload or durability life, the frame 9 will tilt as shown in Figure 4 due to resin material breakage in the form of chips due to crack propagation, or cavities due to internal deterioration. If the side rollers 26 attached to 9 come off the running tread material 8 and the guide function is lost, and the vehicle continues to travel, there is a risk that the wheel unit 6A may come off the running tread material 8 and cause the crane to fall. .

In this embodiment, such a problem is solved as follows. This will be explained with reference to FIG.

That is, in this embodiment, if the resin material 34 of the driving wheel 10 is damaged or severely crushed, the position of the wheel mounting shaft 12 is determined by the crane load and the weight of the suspended load as shown in FIG. Then, the undamaged wheel 11 is turned around the mounting shaft 13 from Q to the position Q', and as a result, the entire frame 9 is tilted by ∠QPQ' with the mounting shaft 13 as the fulcrum P. Due to this slope,
The connecting fitting 15 attached to the frame 9 via the shaft 28 also follows the angle ∠ of the same angle as ∠QPQ'.
The angle will turn by RPR' and fall downward by RR'.

Therefore, the supporting plates 16A, 16B and the mounting plate 17, which are the constituent members of the connecting fitting 15, also fall down.
The amount of depression SS′ and TT′ equivalent to RR′ occurs.

The inclination of the frame body 9 due to this wheel crushing exceeds the allowable range that lacks crane running safety. Therefore, the opposing distances 29A and 29B between the connecting fittings and the wheels, which were set in advance, are eliminated, and the connecting fittings 15 The lower surface of the mounting plate 17 and the edge of the support plate 16 come into pressure contact with the outer diameter portion of the normal wheel 11, and the rotation of the wheel is stopped. As a result, the crane travel is immediately stopped and accidents can be prevented.

Furthermore, this embodiment can provide a simple structure in which the above-mentioned safety mechanism is connected to the coupling fittings 15 in a swingable manner to the centers of the driving wheels 10 and the driven wheels 11 of the frame body 9, and this type of wheel unit The cost of the safety mechanism can be reduced.

In addition, in the above embodiment, the wheel was constructed using a resin material molded around the outer periphery of the iron core, but the wheel may also be constructed of iron or other materials, and in this case, the wheel Instead of collapsing, damage to the wheels, abnormal wear, etc., especially when the connecting fittings fall over a set value, and the present invention can also deal with these problems.

Further, in the above embodiment, both the mounting plate 17 of the connecting fitting 15 and the support plates 16A, 16B are brought into contact with the outer diameter portion of the wheel when the wheel is abnormal, but only one of them is brought into contact with the outer diameter portion of the wheel. Good too.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to prevent crushing or abnormalities caused by damage to the wheel by using a simple configuration in which a connecting fitting that allows the frame to swing freely is attached to the wheel unit, and by rationally arranging and combining the swinging parts. It is possible to provide a crane wheel unit that reliably stops crane travel when wear or the like occurs and satisfies both safety and structural simplification requirements.

[Brief explanation of drawings]

Fig. 1 is a partially exploded perspective view of a wheel unit for a crane according to an embodiment of the present invention, Fig. 2 is an overall perspective view of an erected crane with the wheel unit attached to the crane, and Fig. 3 is a perspective view of the above-mentioned wheel unit. is attached to the saddle frame in normal use, Figure 4 is an explanatory diagram of the wheel's damaged state, Figure 5 is a partially enlarged sectional view showing the composition of the resin material of the wheel and the load condition, and Figure 6 is Similarly, FIG. 7 is a partially enlarged sectional view showing a damaged state, and a partially omitted explanatory view showing details of the operating state of FIG. 4. 1...Trackless overhead crane, 2...Hoisting machine, 3
...Girder, 4, 5...Saddle frame, 6
A, 6B, 7A, 7B...Wheel unit, 8...
Running tread material, 9... Frame body, 10... Drive wheel,
11... Driven wheel, 12, 13... Mounting shaft, 1
4A, 14B...Shaft hole, 15...Connection fitting, 16
A, 16B...Support plate, 17...Mounting plate, 18
A, 18B...Shaft hole, 19A, 19B...Supporting member, 20, 21...Side plate, 22...Connection hole, 2
3...Key plate, 24...Bolt, 25...
Gear motor, 26...Side roller, 27...Buffer material, 28...Shaft, 29A, 29B...Between opposing sides, 30A, 30B...Wheel outer diameter portion, 31...Final stage gear, 32...Iron core , 33...outer circumference, 34...
... Resin material, 35, 37 ... Resin external shape, 36 ... Internal cavity.

Claims (1)

[Scope of Claims] 1. A wheel unit attached to a saddle frame of a crane, through which the crane travels on a running tread, the wheel unit comprising a frame and a frame supported by the frame. The bicycle is equipped with two wheels arranged at a distance in the running direction, and a connecting fitting, etc., a shaft supported by the frame is passed between the wheels, and the connecting fitting is connected to the saddle. It has a mounting plate fixed to the frame and a support plate vertically installed below the mounting plate, and the connecting fitting is swingably attached to the shaft between the wheels via the support plate,
The saddle frame and the frame bodies are connected to each other, and when one of the wheels is crushed or abnormally worn, the frame body tilts around the axis of the other normal wheel, and this tilt causes the frame body to tilt around the axis of the other normal wheel. The connecting fitting constitutes a mechanism in which it falls downward through its mounting shaft, and at least one of the mounting plate and the support plate of the connecting fitting is located partially above the outer diameter portion of each of the wheels. while maintaining a gap with the outer diameter of the wheel, and this opposing gap is such that it disappears when the amount of depression of the connecting fitting exceeds a set value.
In addition to setting the dimensions, the set amount of depression of this connecting fitting should be determined in case one of the wheels is extremely crushed or
A wheel unit for a crane, characterized in that the wheel unit for a crane is determined based on the amount of depression when the frame becomes unsafely tilted due to abnormal wear or the like.