KR101340694B1 - Bladder hybrid tire building drum - Google Patents

Abstract

The present invention relates to a bladder hybrid tire building drum which is used in a vulcanization process as well as a building process, facilitates the ejection of a tire by simple assembly and disassembly and prevents the internal damage of a finished tire in a disassembly process of the building drum. The bladder hybrid tire building drum comprises: a drum shaft (10) which contains multiple frame connection parts (12) along the outer circumferential surface of an upper end; multiple frames (20) which are unfolded and folded while being rotated in a vertical direction by being hinged to each frame connection part of the drum shaft with a hinge pin; a bladder support part (21) which is installed to be detached from the outer end of each frame (20); a bladder (22) which is attached to the outside of the bladder support part (21) so that a half-finished tire is directly attached; a top tie plate (30) which is combined with the drum shaft (10), blocks an upper side of an inner space formed by the bladder support part (21) and is equipped with a steam supply hole (35); a lower tie plate (40) which is combined with the drum shaft (10) and blocks the lower side of the inner space formed by the bladder support part (21); a lower rotation plate (45) which is combined with the lower tie plate (40) and is fixed to the drum shaft (10) by being relatively rotated about the lower tie plate (40); a lower rotation pin (47) which combines the lower rotation plate (45) and lower tie plate (4); and a lower tie pin (46) which combines the lower rotation plate (45) and a drum joint part (11) of the drum shaft (10) and fixes the lower rotation plate (45).

Description

Bladder Hybrid Tire Building Drum

The present invention relates to a tire forming drum that can be used in a vulcanization process as well as a molding process when manufacturing a tire, and in particular, disassembly and assembly are easy to take out a finished tire and prevent internal damage of the finished tire in the process of disassembling the forming drum. The present invention relates to a bladder mixed type tire forming drum.

Typical tires include a refining process of mixing various raw materials to make a compound, a semi-finished product manufacturing process of forming a compound into a sheet-like semifinished product through extrusion, rolling, and cutting, and attaching these semi-finished products to a forming drum. It is completed through a molding process for molding into a green case and a vulcanization process to vulcanize the green case separated from the molding drum to a finished tire.

On the other hand, the recent increase in the cost of labor and low productivity due to high labor costs is a major problem in the manufacturing industry, which is trying to solve the problem and respond to the rapidly changing market demand. Along with these efforts, advances in computer systems and industrial robot technology have enabled cost reduction, productivity improvement, and production of small quantities of various products through the factory's humanization.

The tire industry is also developing new equipments incorporating new technologies, and the development of these new equipments has resulted in the development of molding drums of a completely different form. In other words, in the development of technology for automating the manufacturing process of tires, the most important problem was to connect the manufacturing process of semi-finished products with the molding process and the vulcanization process. By doing so, automation of the tire manufacturing process has been advanced.

In general, the molding process is a process of attaching a semi-finished product to a molding drum to form a green case, and the vulcanization process is to separate the molded green case from the molding drum into a vulcanizing mold and insert a bladder into the green case. After inserting, it expands and forms the appearance of the vulcanized green case to make a finished tire.

As a result, in order to automate the molding process and the vulcanization process, a new concept molding drum was required to mold the green case in the molding process and to insert the green case together with the green case into the vulcanization mold to manufacture the finished tire. Core drums developed in response to demands are disclosed in Korean Patent Laid-Open Nos. 10-2009-0008699 (Patent Document 1) and 10-2010-0038720 (Patent Document 2).

  Patent document 1, the drum shaft is formed with a transfer projection at the upper end; A fixed plate fitted to and fixed to the drum shaft; Coupled on the circumference of the fixing plate, and fastened on the outer circumferential surface of the plurality of drum segments and the fixing plate formed in the fixing hole parallel to the drum shaft, fixing each drum segment to the fixing plate, a plurality of fastening grooves on the lower surface Disclosed is a core drum including a fastening nut to be formed.

The core drum of Patent Document 1 described above is molded into a green case through a molding process on the outer circumferential surface of each drum segment, and the green case is inserted into the vulcanization mold together with the core drum to be vulcanized to complete the finished tire. In the process of separating the core drum by using the core drum disassembly and assembly device to separate the finished tire, there is an advantage to automate the molding process and the vulcanization process.

However, the core drum of the patent document 1 requires a core drum disassembly and assembly apparatus to separate the finished tire, and there is a problem that the damage occurs to the finished tire in the process of separating the core drum, thereby lowering the productivity.

On the other hand, Patent Literature 2 includes: a drum shaft having a fixing protrusion tucked in the longitudinal center; A fixing plate fitted to and fixed to the fixing protrusion on the drum shaft; A plurality of drum segments fitted on the circumference of the fixing plate to fix the green case; And an assembly nut fastened to a fixing bolt provided at a lower side of the fixing plate to tighten and fix each drum segment to the fixing plate, and a gas supply passage is formed therein along the axial direction from one end of the drum shaft. And a core drum communicating with the gas supply passage at a central portion where the fixing plate is fixed and having a plurality of gas injection holes penetrating radially along the circumferential direction.

 The core drum of the patent document 2 is supplied to the drum segments in the vulcanization mold by supplying a high temperature and high pressure heat medium gas necessary for the vulcanization process of the green case through the gas supply passage and the gas injection hole formed in the drum shaft. There is an advantage that the green case is fixed by the vulcanization uniformly.

However, in Patent Document 2, there is a problem that the quality of the left product tire may be deteriorated by the high temperature heat medium gas ejected through the gas injection hole of the core drum directly contacting the inside of the green case, causing local deformation. .

In addition, since the core drum of the above-mentioned patent documents forms a screw thread at the bottom of the fixing plate to fix each drum segment, and fastens the fixing plate by using the fastening nut, the thread is worn out for a long time and various errors occur in the disassembly process of the core drum. There is a problem that arises.

KR 10-2009-0008699 A KR 10-2010-0038720 A

The present invention has been made to solve the above-mentioned conventional problems, it is easy to separate the vulcanized finished tires, as well as providing a bladder mixed-type tire molding drum that does not directly contact the inner surface of the green case of the high temperature heat medium gas Its purpose is to.

It is also an object of the present invention to provide a bladder mixed tire forming drum in which the bladder support is not separated from the drum shaft to simplify disassembly and shorten the process cycle to improve productivity.

It is also an object of the present invention to provide a bladder mixed tire forming drum which can seal the inner space formed by the bladder support without forming a thread by using the structures of the lower fixing plate and the lower rotating plate.

In addition, an object of the present invention is to provide a bladder mixed-type tire molding drum that greatly reduces the weight compared to the existing core drum to improve the precision of the semi-finished product attachment that can occur during the molding process of the green case to improve the performance of the finished tire. have.

The present invention for achieving the above object, a drum shaft formed with a plurality of the skeleton connecting portion along the upper outer peripheral surface of the drum coupling portion; A plurality of armatures hinged by hinge pins to the armature connection portions of the drum shaft and deployed or folded while rotating in an up and down direction; A bladder support unit detachably installed at an outer end of the armature; A bladder attached to the outside of the bladder support to directly attach the tire semi-finished product; An upper fixing plate coupled to the drum shaft to block an upper surface of an inner space formed by the bladder supporter and having a steam supply hole; A lower fixing plate coupled to the drum shaft to block a lower portion of an inner space formed by the bladder supporter; A lower rotary plate coupled to a lower portion of the rotary fixed plate and fixed relative to the drum shaft by being rotated relative to the lower fixed plate; A lower rotating pin coupling the lower rotating plate to the lower fixing plate; And a lower fixing pin configured to couple the lower rotating plate to the lower side of the drum coupling portion of the drum shaft to fix the lower rotating plate.

In addition, according to the bladder mixed-type tire forming drum of the present invention, the lower rotating plate, the rotating hole of a curved shape having a predetermined angle range to enable relative rotation with respect to the lower fixed plate even when the lower rotating pin is fastened, The head of the lower fixing pin to accommodate the separation hole and the lower fixing pin formed larger than the head of the lower fixing pin to be separated from the lower fixing pin in the state that the lower fixing pin is fastened to the drum shaft It is characterized in that it further comprises a locking hole formed in a smaller diameter compared to the communication hole.

Further, according to the bladder mixed tire forming drum of the present invention, the angle range from the end of the separating hole to the end of the locking hole is characterized in that the same as the angle range of the rotating hole.

In addition, according to the bladder mixed-type tire forming drum of the present invention, the rotation limiting means for limiting the rotation of the armature is not provided in the state that the expansion of the armature is completed is provided,

The rotation limiting means may include a locking portion protruding toward the center of the drum shaft from an upper side of the inner end of the armature, and a locking step portion formed so that the locking portion is seated on an upper end of the armature connection portion.

Bladder mixed-type tire forming drum of the present invention, because it is fixed to the skeleton using the lower fixing plate and the lower rotating plate without using the screw and nut used in the conventional core drum, loosening nuts that can occur during the disassembly and assembly of the drum There is an effect that can prevent problems such as poor transport.

In addition, according to the bladder mixed-type tire forming drum of the present invention, since the armature is not completely separated from the drum shaft, it is possible to prevent the phenomenon of scratching the inside of the finished tire by the metal drum segment in the process of removing the finished tire. There is an effect that the deterioration of the finished tires is prevented.

In addition, according to the bladder mixed-type tire forming drum of the present invention, the weight of the drum itself is significantly reduced compared to the conventional core drum, thereby reducing the load on the equipment, thereby improving the accuracy of semi-finished product attachment and thereby improving the performance of the finished tire. It is effective.

Further, according to the bladder mixed tire forming drum of the present invention, it is not necessary to separate the bladder support of the forming drum from the drum shaft in order to take out the finished tire, which simplifies the disassembly and assembly of the drum and thereby shortens the cycle between processes. The productivity is improved.

1 is a block diagram showing a bladder mixed-type tire forming drum according to the present invention.
Figure 2 is a reference diagram showing the appearance when the separation of the finished tire in the bladder mixed-type tire forming drum of the present invention.
Figure 3 is a plan view of the bladder mixed tire forming drum of the present invention.
Figure 4 is a bottom view of the bladder mixed tire forming drum of the present invention.
5 is a reference diagram showing a coupling structure of the lower fixing plate and the lower rotating plate which is the main component of the present invention.
Figure 6 is an exploded perspective view showing a coupling portion of the lower fixing plate and the lower rotating plate of the main configuration of the present invention.

Hereinafter, a bladder mixed-type tire forming drum according to the present invention will be described with reference to the accompanying drawings.

Bladder mixed tire forming drum according to the present invention, as shown in the drawings, the drum shaft 10 formed with a plurality of armature connecting portion 12 along the upper outer peripheral surface of the drum engaging portion 11; A plurality of armatures 20 which are hinged to the armature connecting portions 12 of the drum shaft 10 by hinge pins 13 and are deployed or folded while being rotated in an up and down direction; A bladder support portion 21 detachably installed at an outer end of the armature 20, respectively; A bladder (22) attached to the outside of the bladder support portion (21) to directly attach a tire semifinished product; An upper fixing plate 30 coupled to the drum shaft 10 to block an upper surface of an inner space formed by the bladder support 21 and having a steam supply hole 35; A lower fixing plate 40 coupled to the drum shaft 10 to block a lower portion of the inner space formed by the bladder support 21; A lower rotary plate 45 coupled to the lower side of the rotary fixing plate 40 and rotated relative to the lower fixing plate 40 to be fixed to the drum shaft 10; A lower rotating pin (47) for coupling the lower rotating plate (45) to the lower fixing plate (40); And a lower fixing pin 46 which couples the lower rotating plate 45 to the lower side of the drum coupling part 11 of the drum shaft 10 to fix the lower rotating plate 45.

The lower rotating plate 45 is formed with a plurality of rotating holes 48 of a curved shape having a predetermined angle range to enable relative rotation with respect to the lower fixing plate 40 even when the lower rotating pin 47 is fastened. The separation hole 45a which is larger than the head of the lower fixing pin 46 so that the lower fixing pin 46 may be separated from the lower fixing pin 46 in a state where the lower fixing pin 46 is fastened to the drum shaft 10. And a locking hole 45b having a smaller diameter than the head of the lower fixing pin 46 and communicating with the separating hole 45a to accommodate and fix the lower fixing pin 46. It is formed in the same number as). At this time, it is obvious that the angle range from the end of the separation hole 45a to the end of the locking hole 45b should be the same as the angle range of the rotation hole 48.

Then, it is preferable that the rotation limiting means 25 for limiting the skeleton 20 is not excessively rotated in the state that the deployment of the skeleton 20 is completed. At this time, the rotation limiting means 25 is a locking portion (25a) protruding toward the center of the drum shaft 10 from the upper end of the inner end of the armature 20, the locking on the upper end of the armature connecting portion 12 It consists of a locking jaw portion (25b) is formed so that the portion (25a) is seated.

Bladder integrated tire forming drum of the present invention configured as described above, by using a skeleton rotatably installed on the drum shaft to reduce the diameter of the bladder to easily remove the finished tire.

When molding a semi-finished product into a green case, the armature 20 is raised to have a radial structure orthogonal to the drum shaft 10 so that the bladder 22 coupled to the bladder support 21 is the maximum diameter. . In this state, the lower rotating plate 45 and the lower fixing plate 40 inserted from the lower portion of the drum shaft 20 are coupled to the lower rotating pin 47, and the lower rotating plate 45 and the lower fixing plate 40 are coupled to the lower rotating plate 45. By fixing to the drum coupling portion 11 of the drum shaft 10 so that the armature 20 is fixed in a deployed state.

That is, the lower rotating plate 45 and the lower fixing plate by inserting the lower rotating pin 47 into the rotating hole 48 of the lower rotating plate 45 and fastening to the rotating pin fastening hole 42 of the lower fixing plate 40. Combine 40 integrally. In this state, the lower rotating plate 45 and the lower fixing plate 40 are inserted from the lower portion of the drum shaft 10 and the lower fixing pin 46 fastened to the lower side of the drum coupling portion 11 of the drum shaft 10. The head of the through hole 41 formed in the center of the lower fixing plate 40 to be positioned in the separation hole (45a) of the lower rotating plate (45). Subsequently, the lower fixing plate 40 and the lower rotating plate 45 are rotated by rotating the lower rotating plate 45 so that two heads of the lower fixing pin 47 are inserted into and fixed to the locking hole 45b of the lower rotating plate 45. ) Is fixed to the drum coupling portion 11 of the drum shaft 10.

When the lower fixing plate 40 is fixed to the drum shaft 10 through the above process, the lower fixing plate 40 supports the lower portion of the bladder support 21 to prevent the skeleton 20 from falling, As a result, the forming drum is fully developed to complete the appearance.

After that, the semi-finished products are attached to the bladder 22 positioned outside the bladder support 21 to be molded into a green case, and the molded green case is inserted into the vulcanizing mold together with the forming drum. At this time, since the upper side of the bladder support portion 21 is opened, it is natural that the upper fixing plate 30 is inserted from the upper side of the drum shaft 10 to seal the upper side of the inner space of the bladder support portion 21. Do.

In this state, steam is supplied into the bladder support part 35 through the steam supply hole 35 formed in the upper fixing plate 30. Accordingly, the bladder 22 located on the outside of the bladder support 21 is expanded to press the inner surface of the green case, and the outer surface of the green case is molded by the outer vulcanization mold while the green case is expanded, The finished tire is completed.

When the vulcanization of the green case is completed and the finished tire is completed through the above process, the upper fixing plate 30 is separated from the bladder support part 21 to remove steam in the bladder 22. Subsequently, when the lower fixing plate 40 and the lower rotating plate 45 are separated from the drum shaft 10 by rotating the lower rotating plate 45, the armature 20 is hinge pin due to the load of the bladder support 21. The lower portion of the bladder 22 is reduced by rotating downward about the 13.

As a result, the finished tire can be easily removed from the forming drum, and the inner tire of the finished tire is not directly in contact with the bladder support portion 21. Therefore, the inner surface of the finished tire is damaged during the removal of the finished tire, thereby degrading the quality. Can be prevented.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, Changes will be possible.

10.Drum axes
11.Drum junction
12 ... bone connection
13 ... hinge pin
20 ... the skeleton
21.Blader Support
21 '... steam hole
22 ... Blader
25.Rotation restriction means
25a.
25b.
30.Top fixing plate
35.Steam supply hole
40.Lower fixing plate
41 ... through
42.Rotating Pin Fastener
45 ... lower turntable
45a ... Separation hole
45b ... Locking Hole
46.Lower fixing pin
47 ... Lower turn pin
48 .... Swivel Hall

Claims (4)

A drum shaft 10 having a plurality of armature connecting portions 12 formed along the outer peripheral surface of the upper end of the drum engaging portion 11;
A plurality of armatures 20 which are hinged to the armature connecting portions 12 of the drum shaft 10 by hinge pins 13 and are deployed or folded while being rotated in an up and down direction;
A bladder support portion 21 detachably installed at an outer end of the armature 20, respectively;
A bladder (22) attached to the outside of the bladder support portion (21) to directly attach a tire semifinished product;
An upper fixing plate 30 coupled to the drum shaft 10 to block an upper surface of an inner space formed by the bladder support 21 and having a steam supply hole 35;
A lower fixing plate 40 coupled to the drum shaft 10 to block a lower portion of the inner space formed by the bladder support 21;
A lower rotary plate 45 coupled to the lower side of the rotary fixing plate 40 and rotated relative to the lower fixing plate 40 to be fixed to the drum shaft 10;
A lower rotating pin (47) for coupling the lower rotating plate (45) to the lower fixing plate (40);
A lower fixing pin (46) for fixing the lower rotating plate (45) by coupling the lower rotating plate (45) to the lower side of the drum coupling portion (11) of the drum shaft (10). Tire forming drum. The method of claim 1,
The lower rotating plate 45 has a curved rotating hole 48 having a predetermined angle range to allow relative rotation with respect to the lower fixing plate 40 even when the lower rotating pin 47 is fastened, and the lower The separation hole 45a and the lower portion formed larger than the head of the lower fixing pin 46 so that the fixing pin 46 can be separated from the lower fixing pin 46 in the state in which the fixing pin 46 is fastened to the drum shaft 10. Bladder characterized in that it comprises a locking hole (45b) formed in a smaller diameter than the head of the lower fixing pin 46 and communicated to the separation hole (45a) so that the fixing pin 46 is received and fixed Hybrid tire forming drum. 3. The method of claim 2,
Bladder mixture type tire forming drum, characterized in that the angle range from the end of the separation hole (45a) to the end of the locking hole (45b) is the same as the angle range of the rotation hole (48). 4. The method according to any one of claims 1 to 3,
Rotation restriction means 25 is provided to limit the skeleton 20 from being excessively rotated in the state where the skeleton 20 is completed.
The rotation limiting means 25 is a locking portion (25a) protruding toward the center of the drum shaft 10 from the inner end of the armature 20, and the locking portion (top) on the upper end of the armature connection portion 12 Bladder mixed-type tire forming drum, characterized in that it comprises a locking step (25b) is formed to be seated (25a).

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