JP3085833B2 - Tire vulcanizing mold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vulcanizing mold for a pneumatic tire mounted on an automobile or the like.

[0002]

2. Description of the Related Art Fully automatic tire vulcanizing presses for automatically performing operations such as loading and molding of unvulcanized tires, vulcanization of tires, and removal of vulcanized tires are conventionally known.

[0003]

In the conventional fully automatic tire vulcanizing press, a high-temperature and high-pressure heating / pressurizing medium is introduced into the tire mold with the tire mold closed, and the tire is compacted. The time for carrying in the unvulcanized tire, molding, and taking out the vulcanized tire is shorter than the vulcanization reaction time for vulcanization, and the mold opening / closing device (for tire loading / unloading etc.) A waiting time occurs in the mold opening / closing device for opening and closing the mold) and the tire loading / unloading device, and the operation rate of the mold opening / closing device and the tire loading / unloading device is poor.

[0004] In order to improve the operation rate, a fully automatic tire vulcanizing press of a mold opening / closing device traveling system in which a mold opening / closing device travels across a plurality of tire molds has been already proposed. Requires a tire mold clamping mechanism that clamps the tire mold from outside the tire mold and closes the tire mold against the pressure of the high-temperature, high-pressure heating and pressurized medium introduced inside the tire. As it becomes expensive.

In addition, in this fully automatic tire vulcanizing press of the mold opening / closing device traveling system, a waiting time is generated in the mold opening / closing device at the time of exchanging a tire mold due to a change in the specification of the vulcanized tire, and there is a danger. There was a problem. In addition, the applicant of the present invention uses a force to open a mold generated by the pressure of a high-temperature and high-pressure heating and pressurizing medium (steam, steam inert gas, or hot water) introduced into the tire during vulcanization. A tire vulcanizing mold has already been proposed which eliminates the need to tighten the mold during vulcanization so as not to be opened from the outside by offsetting in the mold (if necessary, Japanese Patent Application No. 4-1121 / 1992). Please refer to).

The present invention has been proposed in view of the above-mentioned problems, and the object thereof is to greatly improve the operation rate of a mold opening and closing device. Also, the time for loosening the bolt can be omitted, and the time for keeping the mold in the tire vulcanizer can be reduced. Another object of the present invention is to provide a tire vulcanizing mold that can prevent the heating and pressurizing medium from being blown out from the attaching / detaching portion and can safely perform the operation.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, a tire vulcanizing mold of the present invention is opened by a heating and pressurizing medium introduced into a tire through a bladder. In a tire vulcanizing mold in which the force to be canceled out in the mold, a bladder gripping flange that grips the upper end of the bladder and a bladder gripping flange that grips the lower end of the bladder can be freely inserted and removed. Are connected via.

In the tire vulcanizing mold, a first attachment / detachment device may be provided between the detachable member and the driving means for contacting / separating each of the bladder gripping flanges. In the tire vulcanizing mold, a second check valve is provided between a passage of the heating and pressurizing medium introduced into the tire through the bladder and a heating and pressurizing medium operating device including a switching valve and the like. An attachment / detachment device may be provided.

[0009]

The tire vulcanizing mold of the present invention is constructed as described above, and performs the following operations. That is, (1) The interval between the upper and lower bladder gripping flanges when the bladder is pulled out from the tire and extended to carry the tire into and out of the tire mold is determined when the bladder is inserted into the tire during vulcanization of the tire. 2 to 3 times the interval of, but the concentricity of the upper and lower bladder gripping flange when the bladder is inserted inside the unvulcanized tire greatly affects the quality of the tire, and during vulcanization,
That is, when transferring the mold in which the high-temperature and high-pressure medium is sealed inside the tire to another place, it is not desirable from the viewpoint of safety that there are parts protruding from the tire mold. While the tire is being vulcanized, the detachable member is contracted, and when the tire is taken in and out, the detachable member is extended.
(2) The first attaching / detaching device is brought into a connected state when the tire is carried in / out of the tire mold, and the connection by the first attaching / detaching device is released when the tire mold is transferred. (3) When loading / unloading the tire into / from the tire mold, the second check valve attachment / detachment device is connected and the check valve is opened, and when transferring the tire mold, the check valve is closed and then attached / detached. Release the connection by the device. (4) It is desirable that connection and disconnection of each of the above attachment / detachment devices be automatically performed.

[0010]

1 to 3 show a tire vulcanizing mold according to the present invention.
An example will be described with reference to FIG. The left part from the line CC in FIG. 1 shows a state immediately after the start of vulcanization, and the part on the right side from the line CC shows a state in which a mold is opened for carrying in a tire. 2) showing the arrow A portion of FIG. 2 in an enlarged manner, a portion on the left side from the line DD shows a state in which the first attaching / detaching device is disconnected, and a portion on the right side from the line DD shows the first portion.
3 (shown by enlarging an arrow B portion in FIG. 1 in FIG. 3) shows a disconnected state of the second check valve attachment / detachment device.

1 is a main body frame of a tire vulcanizer,
3 is an upper plate fixed to the main body frame 1 via the heat insulating material 2,
4 is a mold opening / closing cylinder fixed to the main body frame 1, 5 is a vertically movable arm fixed to the tip of a piston rod of the mold opening / closing cylinder 4, 6 is an upper part of the main body frame 1, a heat insulating material 2, an upper plate 3, The mold opening / closing rod of the mold opening / closing cylinder 4 penetrating the substrate 10 of the tire mold M in a vertical direction,
The lower end of the mold opening / closing rod 6 is fixed to the arm 5.

Reference numeral 7 denotes a center post cylinder (contact / separation driving means) of a bladder gripping flange, which will be described later; 7a, a piston rod of the center post cylinder 7;
a is a connecting / operating sleeve of the first attaching / detaching device 33 in which a is vertically movable, 9 is a sleeve elevating cylinder fixed to the arm 5, and a piston rod of the sleeve elevating cylinder 9 is a lower end of the connecting operation sleeve 8. It is fixed to a flange 8a provided in the section.

Reference numeral 10 denotes a substrate of the tire mold M.
Numeral 0 is concentrically mounted on the upper surface of the upper plate 3 and is detachably fixed to the upper plate 3 by a known locking device (not shown). Reference numeral 11 denotes a lower heat plate, 10a denotes a cylindrical portion formed in the center of the substrate 10, 32 denotes a bush and a packing interposed between the central hole of the lower heat plate 11 and the cylindrical portion 10a, and the lower heat plate 11 A mold opening / closing rod 6 which is assembled so as to be able to ascend and descend using the outer peripheral surface of the cylindrical body 10 a as a guide and is fixed to the arm 5.
Penetrates vertically through a hole 10 e provided in the substrate 10, and the lower heating plate 11 moves up and down by moving up and down the mold opening and closing rod 6 of the mold opening and closing cylinder 4.

Reference numeral 12 denotes a lower sidewall bolted to the lower hot plate 11, 14 denotes a spacer ring bolted to the lower hot plate 11, 13 denotes a lower bead ring and bladder holding flange screwed to the spacer ring 14, and 13a denotes a lower flange. A bladder presser B bolted to the bead ring / bladder holding flange 13 is a bladder, and the lower end of the bladder B is sandwiched between the lower bead ring / bladder holding flange 13 and the bladder presser 13a.

Reference numeral 18 denotes a plurality of circumferentially divided tread molds, and a plurality of segments each having an outer peripheral surface forming a practical conical surface when closed, and each tread mold 18 comprises an inner peripheral surface of each segment 17. Bolted. 15 is a spacer, 16 is an outer ring having a conical surface on the outer peripheral surface of the segment 17 on the inner peripheral surface, and the outer ring 16 is bolted to the substrate 10 via the spacer 15. 1
7c is a T-groove formed in the vertical direction on the outer peripheral surface of the cone of the segment 17, and 16a is a T-bar slidably engaged with the T-groove 17c. The T-bar 16a is fixed to the inner peripheral surface of the outer ring 16 in the conical shape. When the mold opening / closing cylinder 4 is operated in the extension direction to raise the lower hot plate 11, the segment 17
Is pushed up and guided by the T-bar 16a,
The segment 17 slides radially outward, and the tread mold 18 moves radially outward with respect to the lower sidewall mold 12 and moves away from the lower sidewall mold 12. The claw 17a formed below the segment 17 is
Are moved outward in the radial direction with respect to the claw 11a formed on the outer peripheral portion thereof, so that the claws 11a are disengaged from each other.

When the tire mold M is closed, the upper hot plate 19 rides on the segment 17, and the claw 19a formed on the upper hot plate 19 and the segment 17
The pawl 17b formed on the upper part of the arm 17 is engaged or disengaged by sliding the segment 17 in the radial direction. Reference numeral 20 denotes an upper sidewall bolted to the upper hot plate 19, and reference numeral 21 denotes an upper bead ring bolted to the upper sidewall 20. A vertically movable arm (not shown) is provided above the frame 1, and a known hot plate attaching / detaching device (not shown) is attached to this arm.
The arm and the upper hot plate 19 are detachably connected by the upper hot plate attaching / detaching device. When the arm is moved up and down while the segment 17 is open, the upper heating plate 19 moves up and down together with the upper side wall 20.

Reference numeral 35 denotes a detachable member. The detachable member 35 includes a cylindrical portion 10b of the substrate 10 and a cylindrical portion 10b.
The bush and the packing 31 are inserted into the upper end of the bushing, the retaining plate 29 for retaining the bush and the packing 31, and the first center post 26 supported up and down by using the bush and the packing 31 as a guide.
Reference numeral 23 denotes a flange, and the flange 23 is formed by a split ring 24 and a bolt 25 to a first center post 26.
Is fixed to the upper end. Reference numeral 22 denotes a bladder retainer bolted to the flange 23, and the upper end of the bladder B is sandwiched between the bladder retainer 22 and the flange 23.

Reference numeral 33 denotes a first attachment / detachment device. The first attachment / detachment device 33 is fixed to the claw 26a formed inside the lower end of the first center post 26 and the tip end of the piston rod 7a of the post cylinder 7. A block 38, a lever 37 having a claw 37 a at the upper end which engages with the claw 26 a and pivotably supported on the block 37 by a pin 36, and a cam roller 40 rotatably attached to the lower end of the lever 37. ,
The sleeve 8 includes a sleeve 8 having a conical surface 8a formed on the upper end surface for engaging with the cam roller 40, and a spring 41 for urging the claw 37a outward in the radial direction.

In the first attachment / detachment device 33, the sleeve 8
Is raised with respect to the piston rod 7a of the post cylinder 7, the conical surface 8a of the sleeve 8 pushes the cam roller 40 upward, and the lever 37 swings about the pin 36,
The pawl 37a moves inward in the radial direction, moves away from the pawl 26a, and the first center post 26 becomes free with respect to the piston rod 7a of the post cylinder 7. Also sleeve 8
Is lowered with respect to the piston rod 7a of the post cylinder 7, and the pawl 37a is
, The first center post 26 is connected to the piston rod 7 a of the post cylinder 7. 26 'is a guide bush fixed to the first center post 26.

Reference numeral 42 denotes a second check valve attachment / detachment device. The second check valve attachment / detachment device 42 includes a substrate 10 of the tire mold M.
A check valve 42a incorporated into the tire vulcanizer and an attachment / detachment device 42b inside the check valve incorporated into the upper plate 3 of the tire vulcanizer. The check valve 42a is known, and the valve body 43 is inserted into the lower end of the passage 10b of the heating and pressurizing medium,
The valve guide 44 is inserted into the hole 43 a inside the valve body 43 by bolts, and is prevented from falling off by a C-shaped retaining ring 47. Further, the valve rod 45 a of the valve body 45 is slidably inserted into the inner hole of the valve body 43, and the valve body 45 is moved by the compression spring 46 interposed between the valve guide 44 and the valve body 45. It is configured to press against a sheet surface 43b provided at a lower portion.

The attachment / detachment device 42b has a body 49 inserted up and down using a bush 48 fixed to the upper plate 3 as a guide, and a composite cylinder 58 fixed to the lower end of the body 49. The lower end of the piston rod of the first piston 60 is fixed to the frame 1,
The body 49 is raised and lowered by the composite cylinder 58. A seal member 50 is provided on the upper surface of the body 49 so as to prevent the heating and pressurizing medium from leaking from the contact surface when the body 49 rises and comes into contact with the check valve 42a.

In the inner hole 49b of the body 49, a well-known check valve is installed upside down with respect to the check valve 42a. That is, the valve body 51 is inserted into the inner hole 49b of the body 49 so as to be able to move up and down, the valve guide 52 is inserted into the inside of the valve body 51, and is prevented from coming off by the C-shaped retaining ring 47, and is provided above the valve body 51. The valve rod 54a of the valve body 54 engaged with the seat surface is slidably inserted into the inner hole of the valve guide 52, and a compression spring 53 is interposed between the valve guide 52 and the valve body 54,
The valve spring 54 is pressed against the seat surface by the compression spring 53.

When contacting the upper part of the valve body 54,
A projection 54b for pushing and opening both check valves is provided. Below the valve body 51, an extension body 56 is screwed. The extension body 56 is supported together with the valve body 51 so as to be able to ascend and descend using the hole 49b of the body 49 as a guide. The distal end of the piston rod of the second piston 59 of the composite cylinder 58 is screwed, and a heating / pressurizing medium pipe 57 is screwed into the lower side of the extension body 56.

Next, the operation of the tire vulcanizing mold shown in FIGS. 1 to 3 will be specifically described. After the vulcanized tire mold M is suspended on the upper plate 3 of the tire vulcanizer, it is concentrically locked to the upper plate 3 by a lock device (not shown), and the arm of the tire vulcanizer is moved. Then, the arm is connected to the upper heating plate 19 by the attachment / detachment device. Further, the first attachment / detachment device 33 and the second check valve attachment / detachment device 42 are connected.
That is, in the first attachment / detachment device 33, the sleeve elevating cylinder 9 is operated in the sleeve elevating direction, the sleeve 8 is elevated, and the claw 37a is closed via the cam roller 40.
The block 38 is raised by the center post cylinder 7 and the sleeve 8 is also raised at the same time to close the claw 37.
a into the hole formed at the lower end of the first center post 26. Next, the cylinder 9 for raising and lowering the sleeve is operated in the lowering direction of the sleeve.
a is opened and engaged with the pawl 26a of the first center post 26, and the connection by the first attaching / detaching device 33 is completed. Second
In the check valve attachment / detachment device 42 of FIG.
The body 49 is raised by the piston 60 and the check valve 4
After contacting the valve body 43 of 2a, the composite cylinder 58
The valve body 51 is raised via the extension body 56 by the second piston 59. At this time, first, the valve body 45 and the projection 54b of the valve body 54 are brought into contact with each other, and further raised, the two check valves are opened, and the heating and pressurizing medium passage 10b of the substrate 10 of the tire mold M and the tire vulcanization. The connection with the pipe 57 in the machine is made to end the connection in the second check valve attachment / detachment device 42.

Next, the switching valve (not shown) in the tire vulcanizer is switched, and the heating / pressurizing medium sealed in the tire T via the bladder B is passed through the passage 10b → the second check valve attaching / detaching device 42. → After discharging through the pipe 57 and the internal pressure of the tire T is sufficiently lowered, the lower heating plate 11 is pushed up via the piston rod 6 of the mold opening / closing cylinder 4. As the lower heating plate 11 rises, the tread mold 18 relatively expands in diameter together with the segment 17, and the tread mold 18 is separated from the tire T, and at the same time, the engagement between the claws 11a and 17a and the claws 17b and 19a is released. Is done.

Next, the arm of the tire vulcanizer is raised,
The upper sidewall mold 20 and the upper bead ring 21 are raised together with the upper heating plate 19, and the upper sidewall mold 20 is separated from the tire T. Next, the switching valve (not shown) in the tire vulcanizer is switched, and the upper bladder gripping flange 23 is raised via the first center post 26 by the center post cylinder 7 while the inside of the bladder B is kept under a negative pressure.
The bladder B is pulled out from the tire T and extended.

By raising the first center post 26,
When the lower large diameter portion 26b is brought into contact with the small diameter hole 28a above the inner hole of the second center post 28, the second center post 28 is lifted, and the large diameter portion below the second center post 28 is lifted. When the 28b is brought into contact with the small-diameter portion 10d above the inner periphery of the cylindrical portion 10a of the substrate 10, the ascent is stopped (however, depending on the size of the bladder B, the operation of the center post cylinder 7 is stopped halfway and the first Of the center post 26 is stopped).

After the bladder B has been pulled out from the inside of the tire T by the above operation, the vulcanized tire T is lifted out of the tire mold M by an unloader attached to the tire vulcanizer, and then vulcanized. The unvulcanized tire T is suspended by a loader. After the hanging of the unvulcanized tire is completed, the bladder B is inserted into the tire T in the reverse procedure while inserting the low-pressure compressed fluid (steam or inert gas) into the bladder B, and then the upper side wall type 20 down,
When the upper hot plate 19 comes into contact with the segment 17, the lower hot plate 11 is lowered by the mold opening / closing cylinder 4 to reduce the diameter of the tread mold 18.

When the bladder B is inserted into the tire T, when the second center post 28 descends and comes into contact with the stopper plate 34 fixed to the substrate 10, the lowering of the second center post 28 is stopped. . Tread type 18
Is completed, the switching valve is switched, and the heating and pressurizing medium is supplied from the pipe 57 to the second check valve attachment / detachment device 42 to the passage 10.
b into the bladder B to start the vulcanization of the tire T. The pressure of the heating and pressurizing medium causes the tread mold 1
The force to open 8 is offset via outer ring 16. In addition, the force for opening the lower side wall mold 12 and the upper side wall mold 20 is offset by the claw 11a and the claw 17a, the claw 17b and the claw 19a, and the segment 17 which are engaged with each other.

The vulcanization is started and the tire T (bladder B)
When the temperature and pressure in (in) reach the predetermined values, the connection of the attaching / detaching devices 33 and 42 is released in the reverse procedure, but when the valve body 51 is lowered by the second piston 59 of the composite cylinder 58, The two check valves are closed, and the heating and pressurizing medium remains in the space between the two check valves.
opening a switching valve connected to the end of a pipe (not shown) screwed into c, discharging the pipe 49 to a safe place through the passage 49a, and then lowering the body 49 by the first piston 60,
Complete the disconnection.

After the disconnection of each of the attachment / detachment devices 33 and 42 is completed, the tire mold M is transferred to another place by a conveying means (not shown) and vulcanization is continued. During tire vulcanization,
If the outer ring 16 and the upper hot plate 19 are connected by a lock device (not shown), the segment 17 and the outer ring 16 are relatively displaced due to vibration or the like during the transfer of the tire mold M. Trouble can be prevented and it is safe.

[0032]

As described above, the bladder gripping flange 23 for gripping the upper end portion of the bladder B is used in the tire vulcanizing mold of the present invention.
And a bladder gripping flange 1 for gripping the lower end of the bladder B
4 is connected via a detachable member 35 (10a, 26, 28).
5 is shortened, and when the tire T is carried in, the bladder B pulled out from the inside of the tire T is extended by extending the removable member 35, so that vulcanization using the bladder B is performed. Even in the case where the tire mold M is being vulcanized, the tire mold M can be transferred to another place, and the operating rate of the mold opening / closing device and the like, which has conventionally been low in operating rate, can be greatly improved.

Further, since the first attaching / detaching device 33 is provided between the detachable member 35 and the driving means (center post cylinder 7) for moving the bladder gripping flanges 23 and 14 toward and away from each other, the first attaching / detaching device 33 is provided.
The trouble of loosening the bolt can be omitted, and the time for keeping the tire mold M in the tire vulcanizer can be reduced. A heating / pressurizing medium operating device 5 including a switching valve and a passage 10b for the heating / pressurizing medium introduced into the tire T via the bladder B.
8, a second check valve attachment / detachment device 42 is provided.
The time for keeping the tire mold M in the tire vulcanizer can be reduced. In addition to being operable remotely, it is possible to prevent the heating and pressurizing medium from being blown out from the attaching / detaching portion, and it is possible to work safely.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing one embodiment of a tire vulcanizing mold of the present invention.

FIG. 2 is an enlarged vertical sectional side view of an arrow A portion in FIG.

FIG. 3 is an enlarged vertical sectional side view of an arrow B portion in FIG. 1;

[Explanation of symbols]

 7 Drive unit for contact / separation (center post cylinder) 10b Heat / pressurized medium passage 14 Lower bladder gripping flange 23 Upper bladder gripping flange 33 First detachable device 35 Detachable member 42 Second check valve attachment / detachment device 58 Operating device B Bladder T Tire M Tire mold

Claims (3)

(57) [Claims] 1. A tire vulcanization mold in which a force for opening a mold by a heating and pressurizing medium introduced into a tire through a bladder can be offset in the mold. A tire vulcanizing die, wherein a bladder gripping flange for gripping a portion and a bladder gripping flange for gripping a lower end of the bladder are connected via a detachable member. 2. The tire vulcanizing metal according to claim 1, wherein a first attaching / detaching device is provided between the detachable member and the driving means for contacting / separating each of the bladder gripping flanges. Type. 3. A second check valve attachment / detachment device is provided between a passage of the heating / pressurizing medium introduced into the tire through the bladder and an operating device of the heating / pressurizing medium including a switching valve and the like. tire vulcanizing mold according to claim 1 or 2, characterized in that provided.