KR100768551B1 - Air mat and method for manufacturing and device of molding the same - Google Patents

Abstract

The present invention relates to an air mat and a manufacturing method and a molding apparatus for cushioning through the pressure of the air filled in the inside, specifically, the upper plate and the lower plate in an integrated state by a single molding using a rotation molding The present invention relates to a method for manufacturing an air mat and an air mat forming apparatus capable of shortening a manufacturing process and a process time and reducing a cost of a product by reducing a bonding defect rate of an upper plate and a lower plate.

The present invention also relates to an air mat manufacturing method and an air mat forming apparatus that can further simplify the manufacturing process by allowing the air mat to be formed in a state in which a communication path is formed without a separate communication path forming process.

In addition, by allowing the air bag and the air bag of the air mat to communicate with each other through a separate communication member, there is an advantage that can form a connection between the air bag firmly, each air bag can be selectively communicated with the communication member. The present invention relates to an air mat, a method for manufacturing the same, and a molding apparatus capable of partially adjusting the cushion according to circumstances.

Air Mat, Rotational Molding

Description

Air Mat, Manufacturing Method and Forming Apparatus {AIR MAT AND METHOD FOR MANUFACTURING AND DEVICE OF MOLDING THE SAME}

1 is an overall flow chart showing the air mat manufacturing process of the present invention.

Figure 2 is a cross-sectional view showing a mold preparation step of the manufacturing process of the present invention.

Figure 3 is a perspective view and a plan view showing a lower mold of the present invention

4 and 5 are a perspective view and a cross-sectional view showing a communication means forming process of the manufacturing process of the present invention

Figure 6 is a cross-sectional view showing a state in which the connection pipe is installed in the connecting clip during the communication means manifestation process

7 is a cross-sectional view showing a resin injection step of the manufacturing process of the present invention.

8 is a cross-sectional view showing a lower plate installation process of the manufacturing process of the present invention.

9 is a cross-sectional view showing the upper mold installation process of the manufacturing process of the present invention.

10 is a schematic view showing a rotation molding process in the manufacturing process of the present invention

11 is a cross-sectional view showing a state demolding the manufactured air mat

12 is an overall perspective view of an air mat

13 is a plan view showing the communication arrangement of the air bag of the air mat

14 is a plan view showing another form of the air mat air bag arrangement

The present invention relates to an air mat manufacturing method, a molding apparatus, and an air mat manufactured by the manufacturing method through the rotation molding to be able to omit various processes and at the same time prevent the occurrence of product defects.

In general, the air mat is a tool for taking a rest on the air cushion by simply injecting air so that an appropriate cushion is made through the air pressure.

It is generally used widely because of its portability and less installation space.

In particular, in recent years, air mats have been widely used to form convex air pockets in contact with the body to reduce acupressure effects and excessive pressure.

This general air mat is basically a cushion portion formed with an air bag,

It is joined to the lower surface of the cushion portion and consists of a lower plate for sealing the air bag.

In addition, one side of the cushion portion or the lower plate is formed with an air injection hole for injecting air into the air bag.

Such a conventional air mat is manufactured through slush molding during the manufacturing process. The process is first filled with a plastic resin inside the mold and then preheated, and when some of the resin is coated with the required thickness on the inner surface of the mold, the filled resin is poured. The resin layer coated with a predetermined thickness is completely gelled and then cooled, thereby producing a cushioning portion first.

Thereafter, a step of forming a communication path for communicating each air bag of the cushion part with each other is carried out, and a bonding step for joining the lower plate prepared in advance to the cushion part is completed.

However, in the conventional air mat manufacturing method using the slush molding, when the cushion portion is molded, the bottom plate may be joined to the cushion portion only after the molding of the cushion portion is completely completed because the molding is performed in an open state due to the characteristics of the slush molding. .

Therefore, the mating process of the cushion portion and the bottom plate must be completed separately, but the air mat is finally completed.

In particular, the bonding process of the cushion portion and the lower plate is usually made through high frequency bonding or bonding bonding. The high frequency bonding has to be prepared by a separate high frequency bonding machine, and the joining process also takes a long time. As a result, the price of the product rises.

In particular, bonding bonding takes a long process time like the high frequency bonding, and most of the bonding bonding is difficult to be made due to hard joining of the cushion portion and the lower plate due to the manual process.

In addition, a communication path must be formed between the air bag and the air bag so that the air can smoothly enter each air bag.

Since the slush molding can be formed only in a very simple shape, the communication path of the cushion part should be formed through a separate communication path forming process after the molding of the cushion part is completed. Therefore, there is a problem in that the delay of the entire process and the unit cost of the product is increased.

In addition, the conventional air mat manufactured through the method having the above-described problems has a problem in that, when all the air bags are in communication with each other, the partial cushion cannot be adjusted when the difference in the cushion is required in part due to physical conditions.

Particularly, if the patient is inconvenient to move, the pressure caused by the air bag should be partially released when lying on the air mat for a long time, so that the blood circulation can be smoothly made. However, such a control is impossible in a structure in which all the air bags are simultaneously connected. .

The present invention has been proposed to solve the problems of the prior art as described above,

First, the air mat manufacturing method and molding that can simplify the manufacturing process of the air mat by eliminating the need for a separate bonding process of the cushion portion and the lower plate by allowing the lower plate to be manufactured in an integrated state when forming the cushion portion of the air mat It is an object to provide a device.

Second, by manufacturing the cushion unit in the state of being integrated with the lower plate, it is an object of the present invention to provide an air mat manufacturing method and a molding apparatus that can prevent the occurrence of defects by making a solid joint can be made.

Third, an object of the present invention is to provide an air mat and a molding apparatus thereof in which a process for forming a separate communication path is unnecessary by forming a communication path when the cushion part is molded.

Fourth, an object of the present invention is to provide an air mat, a manufacturing method, and a molding apparatus capable of partially adjusting the cushion by selectively communicating the air bag.

Fifth, an object of the present invention is to provide an air mat, a method for manufacturing the same, and a molding apparatus that can prevent damage to an air moving path by connecting an air bag through a separate connection member.

Air mat of the present invention proposed to achieve the above object,

And an air injection and communication means for supplying air into the air bag and the lower plate integrally formed on the lower surface of the cushion part and the air bag.

The manufacturing method for manufacturing such an air mat, as shown in Figure 1,

Basically, the mold preparation process (S102) for preparing the upper mold and the lower mold,

Resin injection step (S104) for injecting a resin into the lower mold,

A lower plate installation step (S106) of covering the lower plate on the upper lower mold;

Covering the upper mold on the upper part of the lower plate, the upper mold installation process (S108) to combine with the lower plate and a rotation molding process of rotating the combined upper and lower molds through a rotation molding machine (S109).

First, as shown in FIG. 2, the mold preparation process S102 is provided on the lower mold 10 and the upper portion of the lower mold 10 in which the cushion portion 206 of the air mat 200 is molded. A step of preparing the upper mold 20 to seal the inside of the lower mold 10 in advance.

At this time, the lower mold 10 has a plurality of air bag forming grooves 12 for forming an air bag of the air mat, as shown in Figs.

The air bag forming grooves 12 are provided with a predetermined interval so that the partition wall 13 is formed between each air bag forming grooves 12, at least one of the air bag forming grooves 12 can communicate with the outside. An air injection section 14 is formed.

In addition, a stepped portion 16 is formed on the upper surface of the lower mold 10 so that the lower plate 50 to be described later can be seated.

The upper mold 20 corresponding to the lower mold 10 is a plate shape having an area greater than or equal to the area of the lower mold 10, and is later mounted on the upper surface of the lower mold 10.

If the air inlet 14 of the lower mold 10 for injecting air into the air bag 202 of the air mat 200 is not formed in each air bag forming groove 12, only one or two is formed at a specific position In this case, the air bags 202 of the air mats 200 manufactured later should be communicated with each other so that the air injected into any one place can be uniformly supplied to each air bags 202.

In the present invention, the operation of forming the communication path 204 in the air pocket of the air mat 200 is performed at the same time as the cushion portion 206 molding to reduce the overall manufacturing process by eliminating a separate communication path forming process. .

To this end, the communication member 30 and the cushion part 206 are integrally formed by performing a communication member installation step S103 of installing the communication member 30 in the lower mold 10 in advance after the mold preparation step S102. At the same time, through the communication member 30 to enable mutual communication between the air bag 202 of the air mat 200.

In order to perform the communicating member installation step (S103), the partition wall 13 formed between each air bag forming groove 12 of the lower mold 10 in the process of preparing the mold (S102) as shown in FIG. This is carried out in a state in which a cutting groove 18 having a predetermined depth is formed in the bottom side).

The communication member installation step (S103) is made of a process for installing a detachable communication member 30, the communication hole 32 is formed in the incision groove (18).

The communication member 30 has a shape and size substantially the same as the shape and size of the incision groove 108, and has a connection clip 34 in which a communication hole 32 penetrating both ends thereof is formed at the center thereof.

At this time, when the connection clip 34 is installed in the incision groove 18 by making the length (A) longer than the thickness (T) of the partition wall 13 of the lower mold, as shown in [Fig. 5], Both ends of the connecting clip 34 are installed to protrude from the cutting groove 18 to a predetermined length (B) to be located inside both of the air bag forming groove (12).

If only the incision groove 18 is formed without the communication member 30, the resin composition 40 injected into the air bag forming groove 12 through the resin injection process S104 described later is a lower mold during the molding process. It is possible to form the communication path 204 by being coated in the air pocket forming groove 12 of the (10) and at the same time also coated on the inner peripheral surface of the cutting groove 18.

However, the resin composition 40 is molded in a state in which the resin composition 40 is transferred to the other air bag forming groove 12 through the cutting groove 18 in the process of being coated on the cutting groove 18 and the air bag forming groove 12 as described above. In the end, a phenomenon in which the thickness of each air bag 202 of the air mat 200 may be changed may occur, and in this process, the cutting groove 18 is blocked or coated with a thickness more than necessary, and thus the air mat 200 is eventually formed. In the air movement may not be made smoothly.

Therefore, by inserting the communication member 30 into the cutting groove 18 through the communication member installation step (S103) as described above, the existence of the communication path by the communication hole 32 of the communication member 30 is maintained as it is. However, the resin composition 40 is moved to another place through the incision groove 18 or the incision groove 18 is blocked, eventually solving the problem that the communication path 204 of the air mat 200 may not be formed. will be.

In particular, in the rotation molding process (S109) to be described later, the resin composition 40 is distributed on the wall surface of the air pocket forming groove 12 by centrifugal force, and the communication member 30 has both ends thereof fixed from the cutting groove 18. By being installed to protrude by the length (B), the resin composition 40 is completely prevented from entering the communication groove 32 of the communication member 30 and moved to another place.

When the separate communication member 30 is used in this way, the incision groove 18 simply serves to fix the communication member 30.

Such a communication member 30 may be embodied only by the connection clip 34 as described above, or as a separate communication tube to the communication hole 32 of the connection clip 34 as shown in (a) of FIG. Insert 36 to allow the two air pocket forming grooves 12 to communicate with each other through the communication hole 32 of the communication tube (36).

In this case, the length of the connecting clip 34 does not necessarily need to be longer than the thickness T of the partition 13, but the length of the communication tube 36 must be longer than the thickness T of the partition 13 to rotate as described above. In the molding process, the resin may be prevented from passing through the communication tube 36 to another place or the communication tube 36 is blocked.

In addition, by inserting a simple rod 37 rather than the communication tube 36 as shown in (b) of FIG. 6 into the communication hole 32 of the connection clip 34, the connection clip (34) by the resin composition 40 in the molding process The communication hole 32 of) can be prevented from being blocked.

In this case, after the manufacture of the air mat 200 is completed, the user pulls the rod 37 from the heat clip 34 from the outside, so that the communication hole 32 of the connection clip 34 is opened.

In addition, as shown in (b) of FIG. 3, the cutting groove 18 and the communication member 30 are selectively installed among the partitions 13 of the air pocket forming grooves 12, thereby providing Only portions of the air pockets 202 may be selectively communicated with each other.

For reference, as described above, the communicating member installation step (S103) is not necessary in the structure of injecting air separately for each air bag 202 of the air mat 200, each air mat 200 by one air injection It is a process that can be selectively applied only when a communication structure is required to supply air to the air bag 202 of the.

As such, the preparation of the lower mold 10 and the upper mold 20 is completed, and when the installation of the communication member 30 is completed, the air pocket forming groove 12 of the lower mold 10 is illustrated in FIG. 7. The resin injection step (S104) of injecting the resin composition 40 for molding the air bag 202 of the air mat 200 is carried out inside.

The resin composition 40 used in the resin injection process (S104) is a mixture of a general synthetic resin in powder form and a plastic material for smooth molding at high temperature by increasing thermoplasticity of the synthetic resin.

Generally, the synthetic resin in powder form mainly uses PVC (polyvinyl chloride), which is easily heat-processed, and may be selected according to the type of synthetic resin as a plastic material, but the risk of containing carcinogens and environmental hormones is relatively high. It would be desirable to use less phthalate plasticizers such as DINP, DNOP, DIDP.

In addition, if a separate pigment is further added to the resin composition 40, the air mat 200 to which the desired color is added may be manufactured.

For reference, before the resin composition 40 is injected into the lower mold 10, an additional molding rod 300 is installed in the air injection portion 14 formed in the lower mold 10, so that the resin composition 40 is formed. The air injection hole 208 may be formed in the air bag 202 of the air mat 200 in the process of forming the cushion part 206 of the air mat 200 while preventing it from escaping to the outside.

If the air injection hole 14 is not formed in the lower mold 10, the air injection hole 208 of the air mat 200 may be simply formed at a predetermined position after the manufacture of the air mat 200 is completed. The forming rod 300 of the installation work is selectively applicable.

When the resin injection step S104 is completed, the lower plate installation step S106 for installing the lower plate 50 constituting the air mat 200 together with the cushion unit 206 to the lower mold is performed.

The lower plate 50 is in the form of a flat plate, as shown in FIG. 8, and is positioned to be seated on the stepped portion 16 formed on the upper surface of the lower mold 10 to cover the inlet of the air pocket forming groove 12. do. At this time, if the material of the lower plate 50 is made of the same material as the resin composition 40, the cushion portion 206 and the lower plate 50 formed by the resin composition 40 in the rotation molding process (S109) to be described later Integration is better and there is an advantage that can be made firmly bonded to each other.

In addition, if the connecting member 30 is also made of the same material as the resin composition 40 and the lower plate 50, the cushion portion 206 and the lower plate 50 and the connecting member 30 of the air mat 200, that is, the air mat Joining of all the structures of 200 can be made firm.

When the lower plate installation process (S106) is completed by mounting the upper mold 20 prepared in advance with the lower mold 10 on the upper surface of the lower mold 10, as shown in Figure 9, the lower plate 50 is firm And fixing the resin composition 40 located in each air pocket forming groove 12 of the lower mold 10 at the same time so as to completely mold the air mold 200 so that the molding of the air mold 200 can be performed (S108). ).

At this time, the upper mold 20 and the lower mold 10 is firmly coupled to each other through a separate fastening means such as fastening bolt (C).

When the fixing of the upper mold 20 and the lower mold 10 is completed, the lower mold 10 and the upper mold 20 are rotated through the rotation molding machine 60 to finalize the air mat 200. The rotation molding step (S109) for molding is performed.

The rotation molding process S109 rotates the molds 10 and 20 in various directions through the rotation molding machine 60 as shown in FIG. 10, and simultaneously heats the mold 10 and 20 through the heater 70. 10) The resin composition 40 contained therein is formed by coating the inner surface of the lower mold 10 to a predetermined thickness.

When the rotation molding process (S109) is carried out, as shown in (a) of FIG. 11, the resin composition 40 located inside the lower mold 12 is distributed on the inner wall surface of the air pocket forming groove 12 by centrifugal force. In the end, the air bag 202 of the air mat 200 is molded. In this process, the resin composition 40 is also distributed on the lower surface of the lower plate 50 and is also distributed on the communication member 30. The air bag 202 and the lower plate 50 and the communication member 30 of the 200 is bonded to each other to be integrally molded.

In addition, the communication member 30 is prevented from flowing into the communication hole 32 of the communication member 30 in the process of dispersing the resin composition 40 because both ends thereof protrude from the partition 13.

 Thereafter, as shown in (b) of FIG. 11, the upper mold 20 and the lower mold 10 are separated, and the lower plate 50 is lifted from the lower mold 10. The air bag 202 and the communication member 30 of the 200 is formed integrally, and each air bag 202 is in communication with each other through the communication hole 32 of the communication member 30. That is, the air mat 200 in which the cushion unit 206, the lower plate 50, and the communication member 30 are integrally formed with each other is manufactured.

In addition, if the thickness of the lower mold 10 is formed to be thinner than the thickness of the upper mold 20, during the rotation molding process (S109), the inner surface of the lower mold 10 is faster than the upper mold 20, the upper mold is made of the upper mold Since the thermal conductivity rises before the 20, the coating of the resin composition 40 in the lower mold 10 is started first.

Therefore, as a result, the thickness of the cushion portion 206 of the air mat formed in the lower mold 10, that is, the air bag 202 is thicker than the thickness of the lower plate 50. As such, by adjusting the thickness and temperature of each mold, the thickness of the cushion part 206 and the lower plate 50 of the air mat 200 may be adjusted.

In this way, by forming the cushion part integrally with the bottom plate, there is no need for a separate joining process for joining the cushion part and the bottom plate, which simplifies the manufacturing process of the air mat and reduces the process time and cost of the product. It is one of the greatest features of the present invention to minimize the defect rate of the product by making a solid bond is made.

In addition, since the communication path of each air bag can be molded together during the molding process of the cushion part, a separate communication path forming process can be omitted, and the communication member is formed in a shape that encloses the communication path of the air mat, thereby preventing damage to the communication path. It is one of the other features of the present invention to make it possible.

The air mat 200 manufactured by the method of manufacturing the air mat having the above-described characteristics and the molding apparatus thereof has a cushion portion 206 in the form of an air bag 202, as shown in FIG.

Lower plate 50 integrally coupled to the lower surface of the cushion portion 206,

Is installed on at least one of the cushion portion 206 and the lower plate 50 to communicate with the air inlet 208 and each of the air bag 202 for supplying external air to the air bag 202 The basic configuration is configured to include an air injection and communication means composed of the communication member 30 is installed.

In this basic configuration, the air injection and communication means is selectively formed only in the air bag 202 of the specific arrangement of the air bag 202, thereby allowing the air injection only in the air bag located in the specific arrangement, as well as optional It is characterized in that it is possible to adjust the pressure of the air.

This air injection and communication means and the first air injection hole 208a and the first air inlet 208a provided in the air bag located in the odd row of the arrangement of the air bag 202 as shown in FIG. The first communication group 220 is formed by being connected to the communication member 30 is installed in a specific arrangement of the plurality of air bags, that is, the odd number of air bags, and

The second air injection hole 208b and the second air injection hole 208b provided in the air bags located in even rows of the air bags are arranged except the air bags belonging to the first communication group 220. The air bag, that is, the air bag positioned in an even row may be installed to form a second communication group 230 formed by the communication member 30 is installed.

In addition, as shown in FIG. 14, the air injection hole 208 and the communication member 30 may be formed in each row of the air bag 202.

In addition, the air injection hole 208 is supplied to the air through a separate air supply means (209).

When the air is supplied to the air bag 202 through the air supply means 209 as shown in FIG. 13, the air supplied to the air bags in odd rows moves only to the air bags arranged in the odd rows. The air supplied to the runner's airbags will only move into the airbags arranged in each even row.

At this time, when the user's physical condition needs to adjust the cushion of the air pockets arranged in the odd rows, the air injection holes 208a provided in the odd rows are opened to lower only the air pressure of the air bags in the odd rows.

As such, by forming the air injection and communication means selectively in the air bag of the air mat, it is one of the other features of the present invention to enable partial cushion adjustment.

As described above, the present invention

First, when forming the cushion part through rotation molding, the lower plate can be manufactured in an integrated state with the gusset part, so that a separate bonding process or a separate bonding device for joining the lower plate and the cushion part is unnecessary, thereby making the manufacturing process of the air mat. It has the advantage of simplifying and lowering the price increase of the product.

Second, by manufacturing the cushion portion and the lower plate in an integrated state, there is an advantage that can reduce the defective rate of the product to be able to make a solid joint with each other.

Third, the cushion portion and the communication path to be molded at the same time has the advantage of eliminating the need for a separate communication path formation.

Fourth, there is an advantage to allow partial cushion control of the air mat by selectively communicating the air bag.

Fifth, there is an advantage to prevent damage to the air movement path by connecting the air bag through a separate connection member.

Claims (14)

As a manufacturing method of the air mat is formed by combining the cushion portion formed in the form of an air bag that accommodates air therein, and the lower plate of the plate shape positioned below the cushion portion, An air pocket forming groove having a predetermined depth is formed at predetermined intervals to prepare a lower mold for forming a cushion portion of the air mat and an upper mold of a plate shape coupled to the lower mold;  A resin injection process of injecting a resin composition into the air pocket forming groove of the lower mold; A lower plate coupling step of coupling a lower plate of a plate shape positioned to cover an inlet of the air pocket forming groove to an upper portion of the lower mold; Positioning the upper mold on the upper portion of the lower plate, the upper mold coupling step of combining the lower mold and the upper mold, By rotating the combined upper and lower molds through a rotation molding machine, the resin composition is coated on the inner surface of the air bag accommodating portion, and at the same time, a rotation molding step is performed to sequentially form the lower plate to form an air cushion. Air mat manufacturing method characterized in that. The method of claim 1, In the mold preparation process A partition between the air pocket forming grooves in the lower mold is formed in the air mat manufacturing method characterized in that the cut groove of a predetermined depth is formed. The method of claim 2, Between the mold preparation process and the resin injection process, Further comprising a communication member installation process for installing the communication member to be detachable to the incision groove for communicating with each air bag molded part of the lower mold, The communication member used in the communication member installation process is formed with a communication groove penetrating both ends and formed with a length longer than the partition wall thickness of the lower mold is installed so that both ends are located in both air pocket forming groove when installed in the incision portion Air mat manufacturing method characterized by. As a molding device of the air mat formed of a cushion portion formed in the form of an air bag that accommodates air therein, and a lower plate of a plate shape positioned below the cushion portion are mutually coupled to each other, A lower mold for forming a cushion portion of the air mat, the air pocket forming grooves having a predetermined depth are formed at predetermined intervals; A lower plate formed in an upper portion of the lower mold to cover the air pocket forming grooves; An upper mold of a plate shape installed on an upper surface of the lower plate and coupled to the lower mold; Rotating the combined upper and lower molds, wherein the resin composition is coated on the inner surface of the air bag accommodating portion, and comprises a rotation molding machine to be formed integrally with the lower plate. The method of claim 4, wherein An air mat forming apparatus, characterized in that a cutout groove having a predetermined depth is formed in the partition wall between each of the air pocket forming grooves of the lower mold. The method of claim 5, The cutout is provided so that the communication member for detachable communication between the two air pocket forming grooves, The communication member is provided with a communication groove penetrating both ends, and formed in a length longer than the thickness of the partition wall, when installed in the incision groove, both ends of the air mat forming apparatus, characterized in that located in the air pocket forming groove. The method of claim 6, The communication member is An air mat forming apparatus, characterized in that a communication hole penetrating both ends is formed and is connected to the cutting groove to be detachably inserted into the cutting groove with a size substantially the same as that of the lower mold cutting groove. The method of claim 6, The communication member is A connection clip having a communication hole penetrating at both ends thereof, the connecting clip being installed to be detachable to the incision groove with a size substantially the same as that of the lower mold incision groove, Comprising a communication tube fitted into the communication hole of the connecting clip, the communication tube is formed in a length longer than the thickness of the partition wall of the lower mold air mat forming apparatus, characterized in that both ends are located inside the air bag forming groove. The method according to any one of claims 4 to 8, The resin composition and the communication clip of the lower plate and the communication member is formed of the same material mutually air mat molding apparatus. The method according to any one of claims 4 to 8, The cutting groove and the communication member of the lower mold is selectively installed among each partition between the air bag forming grooves, the air mat forming apparatus, characterized in that each air bag forming grooves can be selectively communicate with each other. Made by the manufacturing method of claim 1 and the molding apparatus of claim 4, A cushion portion formed by protruding a plurality of air bags, A lower plate integrally formed with the cushion unit; Is provided on at least one of the cushion portion and the lower plate is configured to include an air inlet means consisting of an air inlet for supplying external air to the air bag and a communication member installed to communicate with each air bag, The communication member of the air injection means is an air mat, characterized in that selectively installed between each air bag and the air bag to selectively inject air into each air bag. The method of claim 11, The communication member of the air injection means is installed so as to communicate with each other only the air bag of a specific arrangement by the air mat, characterized in that installed to form a plurality of communication groups. The method of claim 11 or 12, The air injection means A first communication group connected to a first air inlet and the first air inlet to communicate air bags corresponding to a specific arrangement among a plurality of air bags; And a second communication group connected to a second air inlet and the second air inlet to form a second communication group for communicating the remaining air bags except for the air bags belonging to the first communication group. delete

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