JPS6119189Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coupling device for a crane girder and a crane saddle in a medium-capacity hoist type crane whose lifting load is approximately 3 tons (t).

In general, the connection between a crane girder and a crane saddle in a hoist-type crane consists of a required number of plates 2 welded to both ends of the crane girder 1 and frames 4 of the crane saddle 3, as shown on one side in Figure 1a. This was done by threading a nut onto the through bolt 5. Traveling wheels 6, 6 are pivoted to the front and rear of the crane saddle 3, and a gear 7 is attached to one of the traveling wheels 6, and the gear 7 is connected to the output shaft of a traveling electric motor 8 attached to the frame 4. The crane was configured to travel on the traveling rail 9 by the rotational force of the traveling electric motor 8, which was engaged with a gear (not shown) provided on the crane.

In this case, a small-capacity hoist-type crane uses an I-beam as shown in the figure for the crane girder 1, and its manufacture does not require any special difficulty.
Moreover, with an open cross section like I-beam, its flexible structure allows it to absorb some uneven load and allow smooth running even with an irregular runway girder.

However, for medium-capacity hoist-type cranes, I-beams alone are not strong enough, and as a countermeasure, a so-called box-type crane girder, which is made by press-forming a steel plate into a U-shape and welding a flange to the opening, is used. came to be used.
However, a box-type crane girder with such a closed cross section has high torsional rigidity, and therefore requires a high level of precision and diagonal dimensions 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 crane girders are of a welded structure as mentioned above, they are inevitably susceptible to distortion due to thermal effects, and the manufacturing process requires a high degree of precision. technology and expensive equipment.

Conversely, even if a crane girder is manufactured with high precision, if the runway girder is not level or if there is a height difference in the runway girder due to ground subsidence, the crane will not be able to carry out cargo handling smoothly. It was hot.

As a device for eliminating the height difference caused in the runway girder, for example, as shown in Fig. 1b,
It is known that a universal mechanism 10 is attached to the crane saddle 3 via a shaft, and running wheels 6, 6, etc. are attached to the universal mechanism 10, but this mechanism has the drawback that the overall height H of the crane increases. had.

In view of the above-mentioned shortcomings of the conventional technology, the present invention has developed a crane girder and crane saddle that does not require high precision in manufacturing the crane girder and has a simple structure that can maintain stable operation of the crane even if there is an irregularity in the runway girder. The purpose is to obtain a coupling device.

Therefore, in the connection of the crane girder and the crane saddle, the present invention interposes an elastic member in the connection part, and also connects the crane girder and the crane saddle so that they can be relatively displaced by the elastic member and the engagement member. It was designed to do so.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

2 to 4 are views showing the structure of the crane girder and crane saddle coupling device according to the present invention, in which FIG. 2 is a front view, FIG. 3 is a side view, and FIG. 4 is the same as in FIG. It is a sectional view along the arrow line. In these figures, reference numeral 11 denotes a crane saddle, and two running wheels 12, 12 are rotatably attached to the front and rear of the crane saddle 11, one of which is the running wheel 1.
A gear 13 is attached to 2. This gear 13
The crane is assumed to travel in the longitudinal direction of the building on traveling rails 12' installed at the top of both side walls of the building by engaging gears attached to the output shaft of a traveling electric motor (not shown). Become. Also,
An elastic pad 14 made of synthetic rubber or the like and having an appropriate thickness is attached to the upper surface of the width center portion of the crane saddle 11. This elastic pad 14 has the required elastic force and compressive strength.

On the other hand, the crane girder 15 is formed, for example, by pressing a steel plate into a U-shape and fixing a lower flange 16 to the opening, and a first side plate 17 that covers the opening is fixed to both ends with one end protruding from the lower flange 16, and a second side plate 18 that faces the first side plate 17 is fixed to the underside of the lower flange 16, which is spaced from the first side plate 17 by the width dimension of the crane saddle 11. The crane girder 15 is not limited to those manufactured by the above method, and any so-called box type is included in the subject matter of the present invention.

Such a crane girder 15 has a lower flange 16
It is placed on the elastic pad 14 with its lower surface, and at this time, the first and second side plates 17 and 18 fit into the crane saddle 11. Numerals 19 and 19 are inverted L-shaped locking plates, one end of which abuts and clamps from both sides of the lower flange 16, and the other end of which is fixed onto the crane saddle 11.
The crane saddle 11 and the crane girder 15 are positioned by the first and second side plates 17 and 18, and both are coupled to be relatively displaceable in the rail installation direction within the elastic deformation range of the elastic pad. .

Due to the above-described flexible connection structure between the crane saddle 11 and the crane girder 15, when the crane is hoisted by a hoisting machine (not shown) suspended from the crane girder 15 and is moved traversing and traveling, for example, a building Traveling rail 1 built inside
Even if 2' is irregular, an uneven load acts on the elastic pad 14, causing the elastic pad 14 to bend.
By absorbing this, smooth running of the crane will be ensured, and in the manufacturing of the crane,
For example, even if the crane girder 15 is strained, the elastic pad 14 absorbs it, making assembly of the crane easier.

As explained above in detail, the joint structure of the crane girder and crane saddle according to the present invention is
An elastic pad made of synthetic rubber or the like is interposed in the joint portion of the two, and the joint members are used to hold each other in place, thereby positioning and fixing the two, resulting in the following effects.

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

By using elastic pads, a vibration-proofing effect can be obtained.

By using elastic pads, distortion due to welding heat during crane girder manufacturing can be absorbed, so crane girders can be manufactured without requiring much configuration.

Since there is no need to add an extra device 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.

Adoption of a connecting member in place of conventional bolts and nuts eliminates the need for machining of bolt insertion holes in the connecting portion, and can reduce manufacturing costs accordingly.

[Brief explanation of the drawing]

Figure 1a is a perspective view showing an example of a conventional crane girder and crane saddle coupling device, Figure 1b is a side view showing another example, and Figure 2 is a crane girder and crane according to the present invention. FIG. 3 is a similar side view, and FIG. 4 is a cross-sectional view taken along the - arrow line in FIG. 2. 11... Crane saddle, 14... Elastic pad, 15... Crane girder, 17, 18... Side plate, 19... Locking plate.

Claims (1)

[Scope of utility model registration request] Attach an elastic pad to the top of the crane saddle,
An end of a crane girder is placed on the elastic pad, and both sides of the crane saddle are sandwiched by two opposing side plates extending downward from the crane girder, and one end of the crane girder is fixed on the crane saddle. A device for coupling a crane girder and a crane saddle, characterized in that the crane girder is held onto the elastic pad by the other ends of two locking plates.