KR101703112B1 - Air cushion moving device for local friction preventing of diaphragm - Google Patents

Abstract

The present invention relates to an air cushion conveying apparatus for preventing the local friction of a diaphragm. The air cushion conveying apparatus can adjust the curved shape of the exterior of a diaphragm to a flat shape, while the diaphragm is spaced apart from the ground surface and prevents a local part of the diaphragm from having concentrated friction. According to the present invention, the air cushion conveying apparatus for preventing the local friction of the diaphragm is used to convey cargos. The air cushion conveying apparatus includes: a base plate having cargos arranged on the upper part; a floating tube which is arranged on the lower part of the base plate in the shape of a ring to form a first air chamber by using the compressed air; a diaphragm which is coupled to the floating tube or the base plate while surrounding the floating tube to form a partitioned second chamber and a first chamber by using the compressed air; and a volume limiting member which connects and fixes the base plate and the diaphragm for limiting the volume of the second air chamber expanded by the compressed air.

Description

Technical Field [0001] The present invention relates to an air cushion transfer device for preventing local friction of a diaphragm,

The present invention relates to an air cushion transferring apparatus for preventing local friction of a diaphragm, and more particularly, to an apparatus for transferring an air cushion of a diaphragm, which is capable of changing a shape of an outer curvature of a diaphragm in a state where the diaphragm is spaced apart from the ground, To an air cushion transferring device for preventing local friction of the diaphragm which can prevent friction of the air cushion.

Air cushion is a device that lifts a heavy object by using high-pressure air. Air is usually sprayed toward the floor to form an air film layer between the lower surface of the device and the ground, thereby reducing friction with the ground. It facilitates transportation of objects. Such an air cushion may also be referred to as an air-bearing, an air-caster or an air-floater.

With reference to Korean Registered Utility Model No. 20-0423164 (" Air Carrier for High Load Transport Using Compressed Air ") relating to the conventional air cushion, the air caster is made of a rubber material and formed into a ring shape having a hollow portion, A support plate in the form of a disk integrally joined to the upper surface of the tube, and an auxiliary block formed in the shape of a cylindrical block at the center of the support plate and formed in a shape penetrating the hollow portion of the tube, When the compressed air injected from the air inlet is applied, the tube expands and the compressed air is discharged to the micropores and floated from the ground.

However, the conventional air cushion has a problem that the tube is vulnerable to friction with the ground due to its material properties. In addition, since the tube has a torus or half torus shape, the friction is concentrated on the surface facing the ground, and the tube is worn and the life of the tube is shortened. When the material of the tube is changed to solve such a problem, there is a problem that the total manufacturing cost is increased due to an increase in the material cost.

Korea Registered Utility Model No. 20-0423164 (2006.08.03 Announcement, design name: Air-caster for heavy-duty transport using compressed air)

SUMMARY OF THE INVENTION It is an object of the present invention to solve the problems of the prior art, and it is an object of the present invention to provide a diaphragm which is capable of changing the outer curvature shape of the diaphragm in a state in which the diaphragm is spaced apart from the ground surface, And an air cushion transferring device for preventing local friction of the diaphragm.

According to a preferred embodiment of the present invention, an air cushion transfer device for preventing local friction of a diaphragm according to the present invention is an air cushion transfer device for transferring a cargo, Base plate placed; A floating tube provided in a ring shape below the base plate to form a first air chamber by compressed air; A diaphragm coupled to the base plate or the floating tube with the floating tube wrapped to form a second air chamber defined by the compressed air with the first air chamber; And a volume limiting member for connecting and fixing the base plate and the diaphragm in the second air chamber so as to limit the volume of the second air chamber expanded by the compressed air, The diaphragm separates the float tube from the ground by compressed air contained in the second air chamber, and the compressed air in the second air chamber is discharged The diaphragm is spaced from the ground.

Here, the volume limiting member includes a limiting rope formed linearly in correspondence with the volume of the second air chamber to be limited, and having both ends connected and fixed to the base plate and the diaphragm, respectively.

The volume limiting member includes a restriction band formed in a hollow cylindrical shape corresponding to a volume of the second air chamber to be limited, and having both ends connected and fixed to the base plate and the diaphragm, respectively.

Here, the restriction band is formed with an opening through which the compressed air of the second air chamber passes.

The air cushion transferring device for preventing local friction of the diaphragm according to the present invention further includes a stop plate member provided on the diaphragm to keep the diaphragm flat.

The blocking plate member is provided in a central region surrounded by the floating tube.

The air cushion transferring device for preventing local friction of the diaphragm according to the present invention further includes a friction preventing member provided at a portion of the diaphragm facing the ground and preventing abrasion of the diaphragm due to friction with the ground surface .

Here, the friction-preventing member includes at least one abrasion-resistant member which is provided at a portion of the diaphragm facing the ground and has a greater wear resistance than the diaphragm.

Here, the friction preventing member includes at least one rolling member rotatably provided in contact with the ground at a portion facing the ground in the diaphragm.

Here, the diaphragm is formed with a mounting groove in which the friction preventing member is inserted and fixed.

The air cushion transferring device for preventing local friction of the diaphragm according to the present invention further includes a sag preventing magnet for detachably coupling the diaphragm to the base plate by magnetic force depending on whether compressed air is supplied or not.

According to the air cushion transferring device for preventing local friction of the diaphragm according to the present invention, it is possible to change the shape of the outer curvature of the diaphragm to be flat while the diaphragm is spaced from the ground, Can be prevented.

Further, the present invention can freely deform the shape of the volume limiting member according to whether or not the compressed air is received in the second air chamber, and prevent the volume limiting member from interfering with the second air chamber.

In addition, the present invention can maintain the interval between the base plate and the diaphragm substantially constant while allowing compressed air to be accommodated in the second air chamber, and free the flow of compressed air in the second air chamber.

In addition, the present invention can maintain the diaphragm flat in the second air chamber and stabilize the spacing between the diaphragm and the ground.

Further, according to the present invention, it is possible to prevent the diaphragm from being deformed by the compressed air accommodated in the second air chamber and to prevent the diaphragm from being damaged.

In addition, the present invention can suppress or prevent wear of the diaphragm even if friction with the ground occurs in a state where the diaphragm is spaced from the ground.

Further, the present invention facilitates the maintenance of the wear-resistant member, and the wear-resistant member can be easily replaced according to the use period.

In addition, the present invention allows the diaphragm to be stably spaced from the ground and not to interfere with the movement of the transfer device with respect to contact with the ground.

Further, the present invention facilitates the maintenance of the rolling member and makes it easy to replace the rolling member in accordance with the period of use.

Further, the present invention can prevent the base plate from being balanced by the rolling member and stabilize the spacing between the diaphragm and the ground.

The present invention also allows the diaphragm to be stably spaced from the ground even if the compressed air escapes from the first air chamber and the second air chamber.

Further, the present invention can prevent the diaphragm from being sagged by the load of the abrasion-resistant member or the rolling member when the compressed air escapes from the first air chamber and the second air chamber.

1 is a view showing an air cushion transferring apparatus according to an embodiment of the present invention.
2 is a view showing an operation state of the air cushion transferring apparatus according to an embodiment of the present invention.
3 is a view showing a main configuration of a blocking member in an air cushion transferring apparatus according to an embodiment of the present invention.
FIG. 4 is an enlarged view showing a state of engagement of a blocking member in an air cushion transferring apparatus according to an embodiment of the present invention. FIG.
5 is a view showing a modified example of the air cushion transfer device according to the embodiment of the present invention.
FIG. 6 is an enlarged view showing a state of engagement of a deformed blocking member in an air cushion transferring apparatus according to an embodiment of the present invention. FIG.

Hereinafter, an embodiment of an air cushion transferring apparatus for preventing local friction of a diaphragm according to the present invention will be described with reference to the accompanying drawings. Here, the present invention is not limited or limited by the examples. Further, in describing the present invention, a detailed description of well-known functions or constructions may be omitted for clarity of the present invention.

FIG. 1 is a view showing an air cushion transferring apparatus according to an embodiment of the present invention, FIG. 2 is a view showing an operating state of an air cushion transferring apparatus according to an embodiment of the present invention, Fig. 4 is an enlarged view of a main portion showing a state of engagement of a blocking member in an air cushion transferring apparatus according to an embodiment of the present invention; Fig. And FIG. 5 is a view showing a modified example of the air cushion transferring apparatus according to the embodiment of the present invention, and FIG. 6 is a view showing a state of engagement of the deformed blocking member in the air cushion transferring apparatus according to an embodiment of the present invention It is an enlargement of one part.

1 to 6, an air cushion transfer device according to an embodiment of the present invention is an air cushion transfer device for transferring cargo, and includes a base plate 10, a floating tube 30, a diaphragm 40 ), And a blocking member 60.

The base plate 10 is laid on top. The base plate 10 may be in the form of a flat plate. The base plate 10 may have a vent 11 through which compressed air passes.

The base plate 10 can be divided into a base plate and a pipe plate.

In the base plate, the floating tube 30 and the diaphragm 40 are fixed. A ventilation hole (11) may be formed in the base plate.

The pipe plate is laminated and fixed to the base plate. The piping plate allows the cargo to be placed on top. The piping plate may be provided with a connection line 81 of a compressed air unit 80 to be described later. The piping plate can stably fix the connection line 81 of the compressed air unit 80 to be described later and prevent the base plate itself from being deformed by the cargo placed on the piping plate.

The floating tube 30 forms the first air chamber 31 by compressed air. The floating tube (30) is provided in the form of a ring in the lower part of the base plate (10). At this time, the first air chamber 31 can communicate with the air vent 11 to receive the compressed air supplied. Then, the floating tube 30 can separate the base plate 10 from the ground by the compressed air accommodated in the first air chamber 31 as the first air chamber 31 is filled with compressed air. The floating tube 30 may represent a torus or a half torus shape.

Here, the compressed air supplied to the first air chamber 31 can be discharged through the communication pores 32. The compressed air discharged from the communication pores 32 can be supplied to the central region surrounded by the floating tube 30. [ The communication pores 32 can communicate the first air chamber 31 and the second air chamber 42 described later.

The diaphragm 40 forms a second air chamber 42 which is partitioned from the first air chamber 31 by compressed air. The diaphragm 40 is coupled to the base plate 10 or the floating tube 30 while the floating tube 30 is being wrapped.

Here, the second air chamber 42 can receive the compressed air supplied through the communicating pores 32. Although not shown, the second air chamber 42 can receive compressed air supplied in communication with the air vent 11. The diaphragm 40 may close the central region surrounded by the floating tube 30 to form the second air chamber 42. [ Then, the diaphragm 40 can separate the float tube 30 from the ground by the compressed air accommodated in the second air chamber 42 as the compressed air is filled in the second air chamber 42. At this time, the diaphragm 40 may exhibit a half torus shape.

Here, the compressed air supplied to the second air chamber 42 is discharged through the discharge pores 41, so that the diaphragm 40 can be separated from the ground.

The blocking member 60 connects the base plate 10 and the diaphragm 40 in the second air chamber 42. The blocking member (60) limits the volume of the second air chamber (42). The blocking member 60 includes a volume limiting member 64, and may further include a blocking plate member 61.

The volume limiting member 64 limits the volume of the second air chamber 42 that is expanded by compressed air. The volume limiting member 64 connects and fixes the base plate 10 and the diaphragm 40 in the second air chamber 42.

For example, the volume limiting member 64 may include a limiting rope 65.

The limiting rope 65 is formed linearly corresponding to the volume of the second air chamber 42 to be restricted. Both ends of the limiting rope 65 are connected and fixed to the base plate 10 and the diaphragm 40, respectively. The limiting rope 65 may be made of a naturally curved material. The limiting rope 65 is then bent as the second air chamber 42 is retracted and the limiting rope 65 is straightened as the second air chamber 42 is expanded so that the length of the limiting rope 65 The volume of the second air chamber 42 can be limited. At this time, it is advantageous for the limiting rope 65 to bend in a direction not interfering with the action of the anti-sag magnet 70.

Here, rope connecting portions 65a may be provided at both ends of the limiting rope 65. [

The stop plate member 61 is provided in the diaphragm 40. The stop plate member 61 keeps the diaphragm 40 flat. The stop plate member 61 is provided in a central region surrounded by the floating tube 30, so that the flatness of the diaphragm 40 can be stabilized.

At this time, as the volume limiting member 64 includes the limiting rope 65, the blocking plate member 61 is formed with the rope fixing portion 62 for engagement with the limiting rope 65. [ The rope fixing portion 62 can fix one end of the limiting rope 65. [ The rope fixing portion 62 may be formed with a rope supporting portion 62a to which the rope connecting portion 65a is rotatably coupled. Then, the rope connecting portion 65a can be rotated at the rope supporting portion 62a while the limiting rope 65 is bent in accordance with the volume change of the second air chamber 42. [ It is advantageous that the rope fixing portion 62 is also provided on the base plate 10 or the second magnet member 72 to fix the other end of the limiting rope 65. [

As another example, the volume limiting member 64 may include a restriction band 66.

The restriction band 66 is formed in a hollow cylindrical shape corresponding to the volume of the second air chamber 42 that is limited. Both ends of the restricting band 66 are connected and fixed to the base plate 10 and the diaphragm 40, respectively. The restricting band (66) can be made of a naturally bent material. The restriction band 66 is bent as the second air chamber 42 is contracted and the restriction band 66 is formed in the shape of a hollow cylinder so that the restriction band 66 is extended as the second air chamber 42 is expanded. It is possible to limit the volume of the second air chamber 42 corresponding to the length of the second air chamber 42. At this time, it is advantageous that the restricting band 66 is bent in a direction not interfering with the action of the anti-sagging magnet 70. In particular, the restraining band 66 may be bent outwardly of the hollow tube or may be contracted or relaxed in the bellows shape.

The restriction band (66) may be formed with an opening (66a) through the second air chamber (42) so as to allow the compressed air to pass therethrough.

The stop plate member 61 is provided in the diaphragm 40. The stop plate member 61 keeps the diaphragm 40 flat. The stop plate member 61 is provided in a central region surrounded by the floating tube 30, so that the flatness of the diaphragm 40 can be stabilized.

At this time, as the volume limiting member 64 includes the limiting band 66, the band plate member 61 is formed with the band fixing portion 63 for coupling with the limiting band 66. [ The band fixing part 63 can fix one end of the limiting band 66. [ Then, the restriction band 66 is bent in correspondence with the volume change of the second air chamber 42, so that one end of the restriction band 66 can be stably fixed to the stop plate member 61. It is advantageous that the band fixing part 63 is also provided on the base plate 10 or the second magnet member 72 to fix the other end of the limiting band 66. [

Further, as a modified example of the air cushion transferring apparatus according to the embodiment of the present invention, it may further include a friction preventing member 50.

The friction preventing member 50 is provided at a portion of the diaphragm 40 facing the ground. The friction preventing member 50 prevents abrasion of the diaphragm 40 due to contact with the ground or friction with the ground.

In a variant, the friction-preventing member 50 may be constituted by an abrasion-resistant member.

The abrasion resistance member is provided at least one portion of the diaphragm 40 facing the ground. The abrasion-resistant member has greater abrasion resistance than the diaphragm 40.

At this time, the abrasion-resistant member can be detachably attached to the diaphragm 40. Here, the diaphragm 40 and the wear resistant member are not limited to the detachable structure, but the wear resistant member can be detachably attached to the diaphragm 40 through various known types such as fitting and sewing.

As the friction preventing member 50 includes the wear resistant member, the mounting groove in which the wear resistant member is inserted and fixed may be formed in the diaphragm 40. [ Then, a part of the wear-resistant member is inserted and fixed in the mounting groove, and the remaining part of the wear-resistant member protrudes toward the ground to prevent wear of the diaphragm 40 due to contact with the ground.

In addition, the friction preventing member 50 may be constituted by a rolling member.

At least one of the rolling elements is provided at a portion of the diaphragm 40 facing the ground. The rolling member is coupled to the diaphragm 40 so as to be rotatable in contact with the ground.

At this time, the rolling member may be detachably coupled to the diaphragm 40. Here, the diaphragm 40 is not limited to the detachable attachment structure of the rolling member, but may be detachably attached to the diaphragm 40 through various known types such as fitting and sewing.

The rolling member may include a ball supporting member coupled to the diaphragm 40 and a rotating ball member rotatably coupled to the ball supporting member.

As the friction preventing member 50 includes the rolling member, the mounting groove into which the rolling member is inserted and fixed may be formed in the diaphragm 40. Then, the ball supporting member is inserted and fixed in the mounting groove, and the rotating ball member is partially protruded from the ball supporting member and can be rotated in contact with the ground.

The apparatus for feeding an air cushion according to the first embodiment of the present invention may further include a support member 20. [

The receiving member 20 is formed to protrude from the bottom of the base plate 10. The support member 20 allows the floating tube 30 and the diaphragm 40 to be separated from the ground surface in a state in which the first air chamber 31 and the second air chamber 42 are contracted. The support member 20 prevents the floating tube 30 and the diaphragm 40 from touching the ground in a state in which the first air chamber 31 and the second air chamber 42 are contracted and the first air chamber 31 And the second air chamber 42 are contracted, the floating tube 30 and the diaphragm 40 can be protected.

The apparatus for feeding an air cushion according to the first embodiment of the present invention may further include a sag prevention magnet (70).

The sag prevention magnet (70) detachably attaches the diaphragm (40) to the base plate (10) by magnetic force depending on whether compressed air is supplied or not. The sag prevention magnet (70) is provided in the central region surrounded by the floating tube (30), so that the sagging of the diaphragm (40) can be prevented while minimizing the installation position.

The anti-sagging magnet 70 includes a first magnet member 71 provided in the diaphragm 40 in the second air chamber 42 and a second magnet member 71 provided in the base plate 10 in the second air chamber 42. [ Member (72). Here, at least one of the first magnet member 71 and the second magnet member 72 may be a magnet for generating a magnetic force.

The air cushion transfer device according to the first embodiment of the present invention may further include a compressed air unit (80).

The compressed air unit (80) supplies compressed air to the first air chamber (31). Although not shown, the compressed air unit 80 can supply compressed air to the second air chamber 42. Accordingly, the compressed air unit 80 is connected to the air vent 11 to supply compressed air to at least one of the first air chamber 31 and the second air chamber 42.

The compressed air unit 80 may include a connecting line 81 connected to the vent 11. The compressed air unit 80 may further include a compressed air portion 82 for generating compressed air to supply the compressed air to the connection line 81. At this time, the connection line 81 may be provided with an air conditioning unit 83 for adjusting the supply state of the compressed air. The air conditioning unit 83 may include a valve or an air distributor to adjust the supply state of the compressed air supplied to the air vents 11. [

Although not shown, the air cushion transferring apparatus according to the first embodiment of the present invention may further include a ring seat (not shown).

The ring sheet is provided under the base plate 10. The ring sheet can fix the floating tube 30 to the base plate 10. Further, the ring sheet can fix the diaphragm 40 together with the floating tube 30 to the base plate. In addition, the ring sheet can stably communicate the air vent 11 and the first air chamber 31. Although not shown, the ring seat can ensure that the air vent 11 and the second air chamber 42 are in stable communication. As the ring seat is provided, it is possible to prevent the compressed air from leaking from the vent hole (11).

In operation of the air cushion transfer device, compressed air is supplied to the air vent 11 through the compressed air unit 80. Then, as the compressed air is received in the first air chamber 31, the first air chamber 31 can be expanded and the base plate 10 can be separated from the ground. Further, as the compressed air is received in the second air chamber 42, the second air chamber 42 can be expanded to separate the floating tube 30 from the ground. Further, as the compressed air is discharged from the discharge pores 41 formed through the diaphragm 40, the diaphragm 40 can be separated from the ground. At this time, the volume limiting member 64 may be expanded to the maximum length in the bent state to limit the volume of the second air chamber 42.

Thus, the cargo placed on the base plate 10 can be transferred. At this time, in the process of transferring the cargo, the friction preventing member 50 corresponds to the contact with the ground or the friction with the ground, so that the diaphragm 40 can be prevented from being abraded due to contact with the ground or friction with the ground have.

When the compressed air is discharged from the first air chamber 31 and the second air chamber 42, the supporting member 20 is brought into contact with the ground, and the floating tube 20 is inserted into the space formed between the base plate 10 and the ground. (30) and the diaphragm (40) can be accommodated. At this time, by fixing the diaphragm 40 to the base plate 10 by the action of the anti-sagging magnet 70, the diaphragm 40 is sagged by the load of the friction preventing member 50 provided on the diaphragm 40, And the friction preventing member 50 is spaced from the ground, thereby preventing unnecessary friction with the ground surface. It is possible to quickly discharge the compressed air from the first air chamber 31 and the second air chamber 42 through the separate air vent unit (not shown) and to smoothly perform the action of the anti-sagging magnet 70 .

According to the air cushion transferring apparatus for preventing the local friction of the diaphragm described above, the outer curvature shape of the diaphragm 40 can be changed to be flat while the diaphragm 40 is spaced from the ground, It is possible to prevent the site from intensively rubbing against the ground. In addition, depending on whether the compressed air is received in the second air chamber 42, the shape of the volume limiting member 64 can be freely deformed, and the volume limiting member 64 can be prevented from interfering with the second air chamber 42 . The gap between the base plate 10 and the diaphragm 40 is maintained substantially constant while the compressed air is accommodated in the second air chamber 42 and the flow of the compressed air in the second air chamber 42 is maintained I can do it freely.

Further, the diaphragm 40 can be held flat in the second air chamber 42, and the spacing between the diaphragm 40 and the ground can be stabilized. Further, it is possible to prevent abnormal deformation of the diaphragm 40 by the compressed air accommodated in the second air chamber 42, and to prevent the diaphragm 40 from being damaged.

In addition, when diaphragm 40 is spaced apart from the ground, wear of the diaphragm 40 can be suppressed or prevented even if friction with the ground occurs.

Further, maintenance of the wear resistant member is facilitated, and the wear resistant member can be easily replaced according to the use period. Further, the diaphragm 40 can be stably spaced from the paper surface, and can be prevented from interfering with the movement of the transfer device with respect to the contact with the paper surface.

Further, maintenance of the rolling member can be facilitated, and the rolling member can be easily replaced according to the use period. It is also possible to prevent the base plate 10 from being balanced by the rolling member and stabilize the spacing between the diaphragm 40 and the ground.

Further, even if the compressed air escapes from the first air chamber 31 and the second air chamber 42, the diaphragm 40 can be stably spaced from the ground. Further, when the compressed air escapes from the first air chamber 31 and the second air chamber 42, it is possible to prevent the diaphragm 40 from being sagged by the load of the wear-resistant member or the rolling member.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Modify or modify the Software.

10: base plate 11: ventilation hole 20: support member
30: floating tube 31: first air chamber 32: communication porous
40: diaphragm 41: exhaust hole 42: second air chamber
50: friction preventing member 60: blocking member 61: blocking plate member
62: rope fixing portion 62a: rope supporting portion 63: band fixing portion
64: volume restricting member 65: limiting rope 65a: rope connecting portion
66: limiting band 66a: opening 70: anti-sag magnet
71: first magnet member 72: second magnet member 80: compressed air unit
81: connection line 82: compressed air part 83: air conditioning part

Claims (11)

An air cushion transfer device for transferring cargo,
A base plate on which the cargo is placed;
A floating tube provided in a ring shape below the base plate to form a first air chamber by compressed air;
A diaphragm coupled to the base plate or the float tube to form a second air chamber defined by the first air chamber to close a central region surrounded by the floating tube; And
And a volume limiting member for connecting and fixing the base plate and the diaphragm in the second air chamber so as to limit the volume of the second air chamber expanded by the compressed air,
Wherein the floating tube separates the base plate from the ground by compressed air contained in the first air chamber and the diaphragm separates the floating tube from the ground by compressed air contained in the second air chamber, As the compressed air in the second air chamber is discharged, the diaphragm is spaced from the ground,
The volume-
And a limiting rope formed linearly in correspondence with the volume of the second air chamber to be limited, and having both ends connected and fixed to the base plate and the diaphragm, respectively. delete An air cushion transfer device for transferring cargo,
A base plate on which the cargo is placed;
A floating tube provided in a ring shape below the base plate to form a first air chamber by compressed air;
A diaphragm coupled to the base plate or the float tube to form a second air chamber defined by the first air chamber to close a central region surrounded by the floating tube; And
And a volume limiting member for connecting and fixing the base plate and the diaphragm in the second air chamber so as to limit the volume of the second air chamber expanded by the compressed air,
Wherein the floating tube separates the base plate from the ground by compressed air contained in the first air chamber and the diaphragm separates the floating tube from the ground by compressed air contained in the second air chamber, As the compressed air in the second air chamber is discharged, the diaphragm is spaced from the ground,
The volume-
And a restriction band formed in a hollow cylinder shape corresponding to a volume of the second air chamber, the restriction band being connected and fixed to the base plate and the diaphragm, respectively. The method of claim 3,
Wherein an opening through which the compressed air of the second air chamber passes is formed in the restriction band. 5. The method according to any one of claims 1 to 4,
And a stop plate member provided on the diaphragm to keep the diaphragm flat. 6. The method of claim 5,
Wherein the blocking plate member is provided in a central region surrounded by the floating tube. 5. The method according to any one of claims 1 to 4,
Further comprising: a friction preventing member provided at a portion of the diaphragm opposite to the ground, for preventing wear of the diaphragm due to friction with the ground. 8. The method of claim 7,
The friction-
And at least one abrasion-resistant member provided at a portion of the diaphragm opposite to the surface of the diaphragm, the abrasion-resistant member having a greater wear resistance than the diaphragm. 8. The method of claim 7,
The friction-
And at least one rolling member rotatably mounted on the diaphragm in contact with the ground at a portion facing the ground. 8. The method of claim 7,
Wherein the diaphragm is formed with a mounting groove in which the friction preventing member is inserted and fixed. 5. The method according to any one of claims 1 to 4,
And a sag preventing magnet for detachably coupling the diaphragm to the base plate by magnetic force depending on whether compressed air is supplied or not.

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