JPH0235683Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a conveyance device that has a wide range of weights that can convey objects.

[Conventional technology]

Conventional methods in which a large number of through holes are provided in the base plate of a conveyor table into which pressurized fluid is supplied, and a closing body whose lower part is supported by an elastic body is placed inside the conveyor table to close the through holes. Examples of the conveying device include those shown in FIGS. 10 to 12.

In the figure, 1 is a conveyance table of the conveyance device, 2 is a base plate of this conveyance table 1, 3 is a pipe for supplying pressurized fluid into the conveyance table 1, and 4 is a pressure regulating valve installed in this pipe. be. Reference numeral 5 denotes through holes, many of which are bored in the base plate 2. Closing bodies 6 are all of the same size and are disposed in each of the through holes 5 of the same size, and their lower portions are supported by elastic bodies 7 to close the through holes 5.

Now, when the conveyed object 8 is sent onto the conveyor table 1 and a load F is applied to the closing body 6 from above, the closing body 6 descends against the elasticity of the elastic body 7 and connects with the ventilation hole 5. A slight gap 5a is created between them. on the other hand,
Pressurized fluid, for example pressurized air, is supplied into the conveyor table 1 through piping 3, so when a gap is created in the table plate 2, pressurized air is ejected from the gap 5a.
Gives floating force to the conveyed object 8. Therefore, the conveyed object 8 that has been given a levitation force has a significantly reduced surface pressure with the obstructing body 6, and therefore can be easily moved and conveyed over a large number of obstructed bodies 6 by a relatively small lateral pressing force. Ru.

After the object 8 has moved and passed, the closing body 6, which is no longer subject to the load from above, closes the through hole 5 again by the elasticity of the elastic body 7, and stops blowing out the pressurized air. It's summery.

[Problems that this proposal seeks to solve]

However, in such a conventional conveying device, a closing body of the same size is disposed in each passage hole and supported by an elastic body having an equal spring constant, and the passage of these closing bodies is Since all protruding heights from the holes are the same, the load for the elastic body to bend by the protruding height, that is, the range of the weight of the transported object, is narrowly limited, and if this load exceeds that range to a larger one, For example, as shown in FIG. 12, the conveyed object 8 comes into contact with the base plate 2, and the frictional force generated between the two makes it difficult to move the conveyed object 8, and if the load exceeds that range in the direction of the smaller load. There has been a problem in that the deflection of the elastic body is too small and the ejection of pressurized air from the gap 5a stops, or is not sufficient, so that almost no floating force acts on the conveyed object, making conveyance difficult.

This invention was made in view of the problems of the conventional technology, and it solves the above problems by arranging the closing bodies with different protrusion heights and the elastic bodies with different spring constants to support them on the conveyance platform. The purpose is to resolve the issue.

[Means for solving problems]

In this invention, a plurality of closing bodies with a large protrusion height upward from the passage hole and a plurality of closing bodies with a small protrusion height are respectively disposed in the through hole in a state where the closing body blocks the passage hole, and The closing body with a large protruding height is an elastic body with a small spring constant, and the closing body with a small protruding height is a conveying device supported by an elastic body with a large spring constant.

[Effect]

First, when a lightweight conveyance object is placed on a conveyance table, only the obstructing body with a large protruding height receives the conveyed object, and since this obstructing body is supported by an elastic body with a small spring constant, it descends with a small load. Pressurized fluid is ejected from the gap created between the through hole and the closing body as it descends, giving a floating force to the conveyed object. Next, when a heavy object is placed, the obstructor with a large protruding height is first pressed downward, and then the obstructive object with a small protruding height, which is supported by an elastic body with a large spring constant, is lowered. Pressurized fluid is ejected from the gaps created between the closing body and each of the through holes to apply greater levitation force to the heavy objects to facilitate transportation.

〔Example〕

This invention will be explained below based on the drawings. 1 to 9 are diagrams showing embodiments of this invention.

First, the structure will be described. Reference numeral 11 is a conveyance table, 12 is a base plate of this conveyance table, 3 is the aforementioned piping, and 4 is a pressure regulating valve provided in the piping. Reference numeral 13 denotes through holes, many of which are bored in the base plate 12. Reference numeral 13 denotes a larger closing body, and 14 denotes a smaller closing body, each of which has an elastic body 15 at the bottom,
16 so as to close the through holes 17 and 18. Here, the spring constant of the elastic body (compression spring in this embodiment) that supports the large closure body 13 is relatively small, and the spring constant of the spring 16 that supports the small closure body 14 is formed to be relatively large. Reference numerals 19 and 20 are supports provided in the conveyor table 11, and each blocker 1
Immediately before the upper end surfaces of 3 and 14 descend from the upper surface of the base plate 12 in the through holes 17 and 18, the closing bodies 13 and 1
This is for abutting against the lower ends of 4 and supporting them.

Further, the closing bodies 13 and 14 are connected to the through holes 17 and 14, respectively.
The heights h ₁ and h ₂ of the upward protrusion from each through hole when the 18 is closed are such that the protrusion height h ₁ of the large closure body 13 is larger than the protrusion height h ₂ of the small closure body 14 . It is being

Next, the action will be explained.

Now, when a relatively lightweight conveyed object 21 is placed on the conveyor table 11, the conveyed object 21 is first received only by the closing body 13 with a protruding height _h1 , and then this closing body is supported by the elastic body 15 with a small spring constant. Because of this, the object 21 descends with a small load, and pressurized fluid (pressurized air in this embodiment) is ejected from the gap 17a between the object 21 and the blocker 13 that is created in the through hole 17 as it descends, applying a levitation force to the object 21. (See Figure 1). Therefore, in this case, the conveyed object 21 does not come into contact with the closure body 14.

Next, when a relatively heavy conveyance object 22 is placed on the conveyance table 11, the closure body 13, which is supported by the elastic body 15 with a large protrusion height _h1 and a small spring constant, descends under the load. As it descends, pressurized air is ejected from the gap created between the closing body 13 and the through hole 17, giving a certain degree of levitation force to the conveyed object 22, and this levitation force causes the conveyed object 22 to float to some extent. Although its weight is reduced, since the weight is still large, it descends further and comes into contact with the closure body 14 having a protruding height _h2 . However, the elastic body 1 supporting the closure body 14
Since the constant of 6 is large, its deflection is small, and therefore, the conveyed object 22 is supported at a height that does not come into contact with the base plate 12, and due to its deflection, the closure body 1
The conveyed object 22 is given a floating force by the pressurized air jetted out from the gap created between the conveyor 4 and the through hole 17. At this point, as shown in FIG.
is supported by a large number of closing bodies 13 and 14, and is given a larger levitation force by pressurized air jetting out from the gap between each closing body and each through hole,
The state is such that it is easy to transport.

In addition, when the weight of the transported object 22 is even larger, as shown in FIG. Do not lower and maintain a slight protruding height h ₃ . At this time, the pressurized air is
7a, 18a and _h3 , the conveyed material 22
In addition, when the closing bodies 13 and 14 are spherical, they roll into contact with the conveyed object 22, creating a wheel effect and contributing to facilitating the conveyance of the object.

In the embodiment shown in FIGS. 6 and 7, the elastic body 23 is made of rubber or the like, and its operation is the same as that of the previous embodiment.

In the embodiment shown in FIGS. 8 and 9, the closure body 24 is formed in a shape other than a sphere, and when no load is applied, the flange portion 24a of the closure body 24 closes the through hole.
5 has become obstructed. Furthermore, conveyed object 2
If the weight of 2 is too large, the closure body 24 will be replaced by the support body 1.
9 and 20, and is configured to maintain a protruding height _h3 , and its function is similar to that of the previous embodiment.

Note that if the shape of the elastic body can be formed so that its height when fully compressed is the same as the height of the supports 19 and 20, these supports can be omitted.

Further, in this embodiment, the types of the closure bodies are two types, large and small, but it is of course possible to use three types, large, medium and small, or more depending on the situation. In that case, the characteristics, shape, etc. of the elastic body may be set according to the above embodiment.

[Effect of idea]

As explained above, according to this invention, the structure of the conveyance device is such that the conveyance platform is rationally equipped with closing bodies with different protrusion heights and elastic bodies with different characteristics, which is different from the conventional method. The effect is obtained that objects can be transported over a wide range, whereas the range was narrowly limited.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the main part of the embodiment according to the present invention, Figure 2
The figure is a top view of Fig. 1, Fig. 3 is a sectional view of the main part of the embodiment when a heavy conveyed object is placed, Figs. 4 and 5 are partially enlarged views of Figs. 1 and 2, and Fig. 6 and 7 The figure is the second
FIGS. 8 and 9 are partially enlarged views of the third embodiment. FIG. 10 is a sectional view of main parts of the conventional example. FIG. 11 is a partially enlarged view of FIG. The figure is a sectional view of a main part of a conventional example when a heavy object is placed thereon. 1, 11...Transfer platform, 2, 12...Bed plate, 5,
17, 18...Through hole, 6, 7, 13, 14, 24
...Occluded body, 7, 15, 16, 23... Elastic body.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A number of through holes are provided in the base plate of the conveyor table into which pressurized fluid is supplied, and the lower part of the conveyor table is supported by an elastic body so as to close the through holes. In the conveying device in which the body is disposed inside a conveyance table, a plurality of closing bodies having a large protruding height upward from the through hole and a plurality of closing bodies having a small protruding height in a state where the closing body closes the through hole are provided. are respectively disposed in the through holes, and the closing body with a large protruding height is supported by an elastic body with a small spring constant, and the closing body with a small protruding height is supported by an elastic body with a large spring constant. Device. (2) The conveyance platform has a support member that abuts and supports the lower end of the closing body immediately before the upper end surface of the closing body descends from the top surface of the base plate within the through hole. Conveying device as described in section.