JPH0530073Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial field of application) The present invention is suitable for use mainly in medium-capacity hoist-type cranes with a lifting load of around 3 tons.
This invention relates to a coupling device for a crane girder and a crane saddle.

(Prior Art) In general, the connection between the crane girder and the crane saddle in a hoist type crane is made by screwing nuts onto a required number of through bolts 5 to plates 2 welded to both ends of the crane girder 1 and a frame 4 of the crane saddle 3, as shown on one side in Fig. 8. Traveling wheels 6, 6 are attached to the front and rear of the crane saddle 3, and a gear 7 is attached to one of the traveling wheels 6,
The gear 7 was meshed with a gear (not shown) provided on the output shaft of a traveling motor 8 attached to the frame 4, and the rotational force of the traveling motor 8 allowed the crane to travel on traveling rails 9.

In this case, a small-capacity hoist-type crane uses I-beam steel as shown in the figure for the crane girder 1, and its manufacture does not require any special difficulty, and even if it has an open cross section like I-beam steel, For example, due to its flexible structure, even if the runway girder is irregular, it can absorb some uneven load and run smoothly.

However, for medium-capacity hoist-type cranes, I-shaped steel alone is not strong enough, and as a countermeasure, a so-called box-type crane girder is used, which is made by press-forming a steel plate into a U-shape and welding a flange to the opening. It started to be done.
However, a box-type crane girder having such a closed cross section has high torsional rigidity, and therefore, a high level of precision and diagonal dimensions are required for the bolt connection between the crane girder and the crane saddle during crane manufacture. In order to meet these requirements, crane girders must be manufactured with high precision.However, as described above, crane girders are of a welded structure, so they are inevitably susceptible to distortion due to thermal effects, and the manufacturing process is difficult. requires advanced technology and expensive equipment.

Conversely, no matter how precisely the crane girder is manufactured, if the runway girder is not level, or if there is a height difference in the runway girder due to ground subsidence at the installation site, the crane will not be able to move smoothly during cargo handling. There was a drawback that I couldn't do it.

As a device for eliminating the height difference that occurs in the runway girder, for example, as shown in FIG.
0 is attached, and traveling wheels 6, 6, .

Therefore, the present inventor proposed a crane girder and crane saddle coupling device with a simple structure that does not require such high precision in manufacturing the crane girder and can maintain stable operation of the crane even if there is an irregularity in the runway girder. and has already applied for utility model registration and obtained the utility model right (Jikko Sho 61-19189
(see publication). The technical content related to this right is that an elastic pad is pasted on the upper surface of a crane saddle, the end of a crane girder is placed on the elastic pad, and two opposing pads extending downward from the crane girder are attached.
The crane girder is characterized in that both sides of the crane saddle are held between two side plates, and the crane girder is held onto the elastic pad by the other ends of two opposing locking plates, one end of which is fixed onto the crane saddle. and crane saddle coupling device.

(Problems to be solved by the invention) With this configuration, the crane girder and the crane saddle can be connected flexibly, so the drawbacks of the conventional ones mentioned above can be eliminated, and the elastic pad Although it was possible to obtain an anti-vibration effect by adopting this method, the following problems still remain when considering completeness. That is, since the elastic pad is always interposed between the upper surface of the crane saddle and the lower surface of the crane girder, mechanical fatigue occurs in the elastic pad due to repeated deformation, and the life of the elastic pad is shortened.

Surface accuracy is required for the upper surface of the crane saddle and the lower surface of the crane girder, where the elastic pad comes into contact.

Since both sides of the crane saddle are held between side plates extending from the lower surface of the crane girder, surface accuracy of the sides of the crane saddle is required.

Depending on the width of the crane saddle and the width of the crane girder, a variety of elastic butts of various sizes are required. This results in high costs.

The maintainability of the elastic pad is poor.

The present invention has been made with the aim of eliminating such problems.

(Means for Solving the Problems) As a means for solving the above problems, the present invention provides a coupling device for a crane girder and a crane saddle. A shock absorber consisting of a support frame is installed facing the crane girder with an interval larger than the width dimension, and a flange provided on the lower surface of the crane girder is fitted into the opening of the shock absorber, and a shock absorber is attached to the crane girder. Both sides of the shock absorber are sandwiched between fixed positioning plates.

(Function) With the above configuration, even if there is an irregularity between the crane girder and the crane saddle, or if it occurs later, it can be absorbed by the deflection of the cushioning material. Furthermore, even if irregularities occur in the running rail, they can be absorbed in the same way. By appropriately setting the dimensional relationship between the cushioning material and its support frame, the amount of compressive displacement of the cushioning material can be regulated, and the degree of free deformation of the cushioning material can be regulated by the shape of the support frame. The life of the cushioning material is improved.

(Embodiment) Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 6, in which the same members as in FIG. 8 are given the same reference numerals. Reference numeral 3 denotes a crane saddle which travels on traveling rails 9 by means of traveling wheels 6. The running rail 9 is laid next to the wall of a building, and the running rail 9 shown in Fig. 1 was initially correctly laid on the reference plane A, but due to ground subsidence of the building, etc., as shown in the figure. This shows the location of the displacement. A crane girder 1 is attached to the upper part of the crane saddle 3, and its structure is as follows. That is, numeral 11 is a shock absorber, each of which is open on the inside as shown in the figure, and two of these are provided on the upper part of each crane saddle 3 facing each other. Buffer device 1
The mounting interval of 1 is slightly larger than the width dimension of the crane girder 1, and the flange portion 12 provided on the lower surface of the crane girder 1 is fitted from both outside sides. Details of this part will be described later.

FIG. 2 shows the coupling device according to the present invention in an exploded state. To explain this, the buffer device 1
Reference numeral 1 denotes a support frame 14 which has an appropriate length and is formed by welding the outside of a partially open housing 13, and a housing 1 of this support frame 14.
3, two cushioning materials 15 are stored from both outside sides,
15 and end plates 16, 16, and positioning plates 17, 17 located on both sides of the support frame 14.
It is roughly composed of. Furthermore, housing 13
Spacers 18, 18 are welded inside to keep the two buffer materials 15, 15 housed at a predetermined distance. The positioning plates 17, 17 are fixed to both sides of the support frame 14 with bolts 19, 19, and the opposing inner parts in FIG. 2 are fixed to the side surfaces of the crane girder 1 by welding.
Thereafter, by removing the bolts 19, 19, the positioning plates 17, 17 are integrated with the crane girder 1 and clamp the support frame 14 from both outside sides as shown in FIG. 1
7a is a notch groove provided in the positioning plate 17;
It fits into the flange portion 12 of the crane girder 1.

On the other hand, the housing 13, the spacer 18, the buffer material 15, and the end plate 16 have symbols 13a,
There are openings 18a, 15a, and 16a, into which the flange 12 provided on the lower surface of the crane girder 1 is fitted (see FIG. 5). In this case, the opening width t ₁ of the opening 15 a of the buffer material 15 matches the plate thickness t ₂ of the flange portion 12 of the crane girder 1 , and the housing 1
The opening width t3 of the opening 13a of No. 3 and the opening 16a of the end plate 16 is made slightly smaller than the opening width _t3 .
The opening width t ₃ of the housing 13 and the end plate 16 is a size suitable for protecting the cushioning material 15, that is, the flange portion 12 is formed at the opening 1 of the housing 13 before the elastic limit of the cushioning material 15 is reached.
3a and the opening 16a of the end plate 16. Also, the end plate 16
The opening depth W ₁ of the opening 16 a is slightly larger than the opening depth W ₂ of the buffer material 15 . and,
Back standing portion 1 of opening 16a of end plate 16
6b is in contact with the side surface 12a of the flange portion 12 of the crane girder 1, and controls diagonal resistance (twisting) of the crane girder 1.

This coupling device is used by fixing the support frame 14 to the crane saddle 3 with bolts 20 and nuts 21. Note that the required number of holes 22 drilled in the support frame 14 are selected holes corresponding to the width of the crane saddle 3. The coupling device according to the present invention configured in this way does not require the manufacturing accuracy of the hoist type crane to be so strict, that is, the manufacturing accuracy of the crane girder 1, the accuracy of the mounting part of the crane girder 1 and the crane saddle 3, and the crane Even if the accuracy between the saddle 3 and the running wheels 6 and the accuracy against distortion due to the years of use of each member are not very high, or if the building tilts due to ground subsidence or external vibration after being installed on the building, Traveling rail 9
Even if irregularities occur, this will be absorbed by the flexible connection between the crane girder 1 and the crane saddle 3, so that no problems will arise in use. When the flange portion 12 provided on the lower surface of the crane girder 1 is displaced within the opening of each member due to an irregularity in any part, the opening width t ₁ of the opening 15a of the buffer material 15 is changed as described above. are the opening 13a of the housing 13 and the end plate 16.
Since the opening width _t3 of the opening 16a is made slightly smaller than the opening width t3 of the opening 16a, which is a size suitable for protecting the cushioning material 15, the flange portion 12 closes the opening of the housing 13 before any force is applied to the cushioning material 15. 13a and the opening 16a of the end plate 16,
It will not move any further. FIG. 6a shows that the flange portion 12, which has just fitted into the opening 15a of the cushioning material 15, is lowered from the center position in the normal state due to the aforementioned irregularity, and the cushioning material 15 is bent downward. Housing 13 and end plate 16
Fig. 6(b) shows the position where it has been displaced upwards. In any of these cases, the flange portion 12
The buffer material 15 can absorb the strain while it is displaced within the range of the opening 13a of the housing 13 and the opening 16a of the end plate 16; When the housing 13 and the end plate 16 come into contact with the upper or lower side of the opening 16a, further displacement is prevented and the load is received by the housing 13 and the end plate 16.
This will protect the buffer material 15. Therefore, the buffer material 15 will not be damaged.

In the embodiments described above, all the members of this part including the housing 13 have been described as having a rectangular shape with some openings, but the present invention is not limited to this. It may also be circular as shown in FIG. Since the function of this element is the same as that of the rectangular element described above, the same reference numerals will be used and the explanation thereof will be omitted.
Further, although the spacer 18 is shown as being welded in advance inside the housing 13 as shown in FIG. 2, it is also possible to use two plate-shaped pieces placed at both ends and joined together with a rod-shaped piece. etc., other shapes may also be used. By changing the length of the spacer 18 as appropriate, it is possible to adapt the spacer 18 to hoist cranes having different widths. Further, the cushioning material 15 is not particularly limited as long as it has flexibility, such as natural rubber or urethane material.

(Effects of the invention) Since the present invention is constructed as described above, it has many effects as described below.

Since the crane girder and crane saddle are connected in a flexible manner, smooth running of the crane can be ensured even if there are irregularities in the rails.

Since a cushioning material is used, it is possible to obtain an anti-vibration effect.

Since the cushioning material is used, distortion due to welding heat during crane girder manufacturing can be absorbed, so crane girders can be manufactured without requiring much precision.

Since there is no need to add extra devices to increase flexibility, such as a universal mechanism, to the connection between the crane girder and the crane saddle, the overall height of the crane can be kept as low as possible.

Since the amount of compressive displacement of the cushioning material is regulated and the degree of free deformation of the cushioning material is regulated by being accommodated in the housing, the life of the cushioning material is improved.

Since the structure is such that the flange portion of the lower surface of the crane girder is inserted into the opening of the buffer material, the surface accuracy of the upper surface and side surfaces of the crane saddle and the lower surface of the crane girder is not required to be very high.

The size of the cushioning material is not particularly limited by the width of the crane girder or crane saddle. Therefore, the coupling device according to the present invention can be made into a unit, and manufacturing costs can be reduced due to the advantage of mass production.

Even when replacing the cushioning material, it can be easily done by removing the mounting bolts and pulling out the unit, improving maintainability.

In connection with the above, it can also be easily installed on existing cranes.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing how the coupling device according to the present invention is used, Fig. 2 is a perspective view showing the coupling device according to the present invention in an exploded state, and Fig. 3 is an assembly plane of the coupling device according to the present invention. Figure 4 is a view taken along the - line arrow in Figure 3, Figure 5 is an enlarged front view showing the main parts of Figure 4, Figures 6a and b are explanatory diagrams showing the deflection state of the cushioning material, FIG. 7 is a perspective view showing a modified example of the shock absorber, FIG. 8 is a perspective view of a conventional example, and FIG. 9 is a side view showing another conventional example. DESCRIPTION OF SYMBOLS 1... Crane girder, 3... Crane saddle, 6... Traveling wheel, 8... Traveling electric motor, 9...
...Running rail, 11...Buffer device, 12...Flange portion, 13...Housing, 14...Support frame, 15...Buffer material, 16...End plate, 17...Positioning plate, 18...Spacer ,1
3a, 15a, 16a, 18a...openings.

Claims (1)

[Scope of utility model registration request] A shock absorber consisting of a shock absorber and its support frame each having an opening on the inside is installed on the top of the crane saddle so as to face each other with an interval larger than the width of the crane girder, and the crane girder is attached to the opening of the shock absorber. A coupling device for a crane girder and a crane saddle, characterized in that a flange portion provided on the lower surface is inserted into the crane girder, and both sides of the shock absorber are held between positioning plates fixed to the crane girder.