JP2999074B2 - Central mechanism of bladderless tire vulcanizer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bladderless tire vulcanizer.

[0002]

2. Description of the Related Art In a conventional tire vulcanizer, a rubber bag called a bladder is inserted into the inner surface of a raw tire, and the raw tire is heated and pressurized by a vulcanizing medium fed into the bladder.
They are trying to get vulcanized tires. The bladder is used to prevent the vulcanizing medium from leaking out of the green tire.

[0003]

The tire vulcanizer using the bladder has the following disadvantages. That is, the bladder is a consumable item, which requires a lot of cost. In addition, it takes a lot of time to replace the bladder, which deteriorates the operation rate of the tire vulcanizer. Further, since the green tire is indirectly heated by the vulcanization medium, the operating rate is deteriorated due to energy loss and heating time. In addition, the failure rate of the product is large due to the destruction and deformation of the bladder.

[0004] The application of a lubricant to the inner surface of a raw tire to improve the slip with the bladder not only causes energy loss but also hinders the distribution of the raw tire. The present invention has been made in view of the above problems, and the object thereof is to eliminate the need for a consumable bladder. Tire failure rate due to bladder breakage and deformation can be reduced. It is not necessary to apply a lubricant to the inner surface of the tire. Since the upper and lower sectors are a set of central mechanisms, cost reduction and maintenance improvement can be achieved. The centering of the raw tire can be performed accurately. Since the bead portion is press-fitted, the quality of the tire can be improved. The accuracy of the bead inner surface can be improved. A low-cost drainage mechanism in the tire can be obtained. It is an object of the present invention to provide a central mechanism of a tire vulcanizer that can improve the quality of a tire (can maintain a constant temperature distribution) by draining the inside of the tire.

[0005]

In order to achieve the above object, a central mechanism of a bladderless tire vulcanizer according to the present invention comprises:
Shrinkable and expandable upper and lower sectors for pressing the upper and lower beads of the tire against a mold to seal the vulcanizing medium and forming the bead portion, a mechanism for operating the sectors,
When retracted, it is stored in the upper and lower sectors, and the upper and lower sectors expand.
Automatically swings and tilts outward when tensioning
It has a drain discharge nozzle for draining
It is characterized by the following.

Further, in the present invention, in the center mechanism of the bladderless tire vulcanizer, the upper and lower sectors and the operation mechanism of the sector are disposed at the center position of the tire vulcanizer so as to be movable up and down.
It is characterized by the following.

[0007]

The center mechanism of the bladderless tire vulcanizer of the present invention is constructed as described above. The upper die is raised from the lower die, and the green tire is positioned between the upper and lower dies. And then raise the upper and lower sectors, insert them into the raw tires, center the raw tires, then expand the upper and lower sectors, and contact the inner periphery of the raw tires,
Swing and tilt the drain discharge nozzle outward to bring the nozzle opening into contact with the inner surface of the raw tire, and then lower the upper and lower sectors and the upper mold, and use the upper and lower sectors to raise and lower the upper and lower beads of the raw tire. Pressing into the bead portion of the mold to complete sealing of this portion, then vulcanizing medium is introduced into the green tire to vulcanize the green tire. At this time, the drain generated in the concave portion of the raw tire is discharged from the drain discharge nozzle to the outside.

[0008]

FIG. 1 shows a central mechanism of a tire vulcanizer according to the present invention.
This will be described with reference to an embodiment shown in FIGS. FIG. 1 is a longitudinal sectional side view of a central mechanism of the tire vulcanizer, FIG. 2 is a cross-sectional plan view taken along line II in FIG. 1, and FIG.
It is a cross section bottom view along a b line.

1 is an inner shaft, and the upper end of the inner shaft 1 is formed in a disk shape, and a plurality of holes (six in this embodiment) are provided in the upper disk portion. , Pin 2 in these holes
Is inserted and fixed. A groove is provided in the inner shaft 1 immediately below the upper end disk-shaped portion, and a snap ring 3 is attached to the groove. Further, a ventilation groove is provided on the outer peripheral portion of the inner shaft 1 immediately below the groove, and a ventilation hole is provided in the ventilation groove from a ventilation hole provided at the center of the inner shaft 1. A hose connection screw 1b is provided at a lower end portion, and a spline is provided at an upper outer peripheral portion of the inner shaft 1,
Two grooves are provided on the lower outer peripheral portion of the inner shaft 1, and a snap ring 3 is attached to these grooves. A lever 1a is provided on the outer peripheral portion of the inner shaft 1 below these grooves. The clevis 4a is attached to the tip of the rod of the fluid pressure cylinder 4, and the pin 4b is loosely fitted into the hole of the clevis 4a and the hole of the lever 1a.

Reference numeral 5 denotes an outer shaft loosely fitted around the inner shaft 1. The upper end of the outer shaft 5 has two rods 5a.
A drain drain hole 5b in the tire is provided in the upper disk-shaped portion, and a pin (spherical joint) for swingably supporting the drain discharge nozzle 6 is provided in the upper disk-shaped portion. 7) is attached. A drain passage is formed between the outer shaft 5 and the inner shaft 1. The drain passage connects the drain hole 5c and the screw hole 5d. 5e is a flange 5e integral with the lower end of the outer shaft 5.
At both ends of the flange 5e, threaded holes are provided, and the threaded ends of the rods of the two hydraulic cylinders 8 are screwed into these threaded holes.
On the lower surface of e, the head-side flanges of the two hydraulic cylinders 9 are fixed by bolts or the like. On the inner hole surface of this flange 5e, a groove is provided, and the O-ring 10 is supported.
The O-ring 10 is in fluid-tight contact with the outer peripheral surface of the inner shaft 1.

Reference numeral 11 denotes a nozzle plate. The nozzle plate 11 is rotatably supported by the inner shaft 1. The nozzle plate 11 is provided with a plurality of ventilation holes radially. The outer shaft 5 is provided with two holes that loosely fit into one rod 5a. 12 is a plurality of upper sectors,
The holes provided in these upper sectors 12 support the spring boxes 13, and the spacers 14 are inserted into the long holes provided in the center of these upper sectors 12, and this portion is covered with the upper plate 15, and the bolt 16 is It penetrates through the bolt hole of the upper plate 15 and the spacer 14 and is screwed into a screw hole provided in the nozzle plate 11. The spacer 14 has a function of maintaining a gap between the upper plate 15 and the nozzle plate 11 so that the upper sector 12 can slide.

Reference numeral 17 denotes a lower sector. The lower sector 17 is also formed by using a lower plate 18, a spacer 14, and bolts 16 to form an upper sector 1.
2 is attached to the outer shaft 5. Reference numeral 19 denotes a plurality of pins, the upper ends of the pins 19 are fixed to holes provided in the middle plate 20, and the lower ends of the pins 19 rotatably support the roller 21, and the outer surface of the roller 21 is a lower sector. 2
2 is in contact with a roller groove provided in the roller 2. Reference numeral 20 denotes a middle plate, and an inner hole of the middle plate 20 is engaged with a spline provided on the outer peripheral surface of the inner shaft 1. Reference numeral 23 denotes a spacer having the same height as the spacer 14, and the spacer 23 is fixed to the outer shaft 5 by bolts 24.

Reference numeral 25 denotes an upper sector 25.
A roller groove is provided on an upper surface of the inner shaft 1, and a pin 2 is fixed to an upper disc-shaped portion of the inner shaft 1.
A roller 26 is rotatably mounted, and the roller 26 is in contact with the roller groove. Reference numeral 27 denotes a receiving plate, and two O-ring grooves are provided on the inner surface of the receiving plate 27, and the O-ring 10 is attached to these grooves. A drain passage in the tire is provided on the inner surface of the receiving plate 27 between the O-ring grooves, and the drain passage in the tire communicates with the screw hole 27a. Also, on the outer peripheral portion of the receiving plate 27,
An O-ring groove is provided, and an O-ring 28 is mounted in this groove.

Reference numeral 29 denotes a plate supported by the snap rings 3 and 3, and the center of the plate 29 slidably contacts the outer peripheral surface of the inner shaft 1. Screw holes are provided, and the tip screws of the rods of the fluid pressure cylinder 9 are screwed into these screw holes, and the upper trunnion of the fluid pressure cylinder 4 is loosely fitted into the hole provided on the lower surface of the plate 29. . Reference numeral 30 denotes a bracket in which the lower trunnion is loosely coupled, and the bracket 30 is fixed to the plate 29 by bolts 31. 32 is each of the sectors 12, 17, 22,
Links 33 having pins fixed to the pins 25 and 34 and having holes which fit into the pins 32 connect the sectors. The lower sector 34 has a special shape in which a groove is added to the lower sector 22.

FIG. 4 shows a cross section of the spring box 13 in which a pre-biased spring 35 is attached to the upper sector 12 by a single spring receiver 12a.
The spring box 13 is pushed upward from the upper surface of the spring box 13, and the flange portion 13 a of the spring box 13 contacts the upper sector 12, and the upward movement of the spring box 13 stops. FIG. 5 shows that the spring 35
Indicates a compressed state. The same applies to the lower sector 17.

FIG. 6 is a partially enlarged longitudinal side view of the drain discharge nozzle 6. The lower end of one rod 6 a is formed in the drain discharge nozzle 6 in a spherical shape, and the spherical portion is provided in the lower sector 34. It is loosely fitted in the groove. FIG. 6 shows the nozzle plate 11.
Indicates a state where the drain discharge nozzle 6 is held horizontally. FIG. 7 shows the nozzle plate 11 from the state of FIG.
Move upward, and the drain discharge nozzle 6 is tilted.

FIG. 8 is a plan view of the drain discharge nozzle 6 as viewed from above.
Shows a state in which is stored. FIG. 9 shows a state in which the drain discharge nozzle 6 swings around the pin 7 and moves to a predetermined position as the lower sector 34 expands. FIG. 10 shows each sector 12, 17, 22, 25 as a result of turning the outer shaft 5 by the operation of the fluid pressure cylinder 4 from FIG. 2 (a cross-sectional plan view taken along line II in FIG. 1). , 34
Shows a state in which it has expanded and changed to a circle.

FIG. 11 to FIG. 13 are explanatory diagrams of the operation of the tire vulcanizer. The lifting / lowering, pressurizing and heating devices are known and are omitted. In the tire vulcanizer, the bolster 41 has an upper insulating plate 4
2. The upper heating plate 43 and the upper mold 44 are fixed using bolts or the like. The groove of the O-ring 45 is provided below the bolster 41 to seal between the bolster 41 and the upper mold 44. Then, a lower heat insulating plate 47, a lower heating plate 48, and a lower mold 49 are fixed on a base 46 fixed to the floor surface using bolts or the like. The central mechanisms 1 to 35 are inserted into the central portion.

FIG. 11 shows a state where the green tire 51 is transferred to the center of the vulcanizer by the loader 50 (only necessary parts are shown). FIG. 12 shows a state where the raw tire 51 is received from the loader 50 by the central mechanisms 1 to 35. FIG. 13 shows that the upper mold 44 is lowered and the upper mold 44 is moved downward.
After the lower surface of the vulcanized tire 52 is brought into close contact with the upper surface of the lower mold 49, a predetermined pressure is applied to vulcanize the vulcanized tire 52.

Next, the operation of the central mechanism of the tire vulcanizer shown in FIGS. 1 to 13 will be specifically described. As shown in FIG. 11, the raw tire 5
1 is transferred by the loader 50, and the green tire 51 is set at the center of the vulcanizer of the tire vulcanizer. At this time, each sector 12, 17, 22, 25, 34 of the central mechanism is in the contracted position by the action of the hydraulic cylinder 4, and
1 can pass through. Drain discharge nozzle 6
Similarly, the vehicle can pass through the raw tire 51.

Thereafter, the hydraulic cylinder 8 is operated in the extending direction, the hydraulic cylinder 9 is operated in the contracting direction, and then the hydraulic cylinder 4 is operated, so that each of the sectors 12, 17, 2 is operated.
2, 25 and 34 are expanded, and the spring box 13 is
In contact with the inner circumference. Next, the loader 50 moves the raw tire 5
Release 1 and move out of the machine. FIG. 12 shows a state in which the above operation is performed. The drain discharge nozzle 6 swings out to a predetermined position, and the nozzle opening of the drain discharge nozzle 6 is
1 touches the inner surface.

Next, the hydraulic cylinder 8 is operated in the contracting direction, and the upper mold 44 is lowered. Then, the lower spring box 13 comes into contact with the receiving plate 27, the upper spring box 13 comes into contact with the upper mold 44, and the spring 35 is compressed, resulting in the state shown in FIG. At this point, the lowering of the upper mold 44 is temporarily stopped. The upper and lower bead portions of the raw tire 51 are attached to the bead portions 44a and 49a of the upper and lower molds 44 and 49, respectively, in the sectors 12, 17, 2 and
The seal is completed by press-fitting with 2, 25, and 34.
Next, steam or the like having a predetermined pressure is ventilated from a vent provided in the nozzle plate 11 to perform preliminary expansion called shaping. Next, the upper mold 44 is lowered, and the lower surface thereof is brought into contact with the upper surface of the lower mold 49, and then a predetermined pressing force is applied to obtain the state shown in FIG.

Next, a vulcanizing medium is introduced into the raw tire 51 from a hose or the like connected to the screw 1b at the lower end of the inner shaft 1, and the raw tire 51 is vulcanized. At the same time, the drain generated in the concave portion of the raw tire 51 is discharged to the outside through the nozzle port of the drain discharge nozzle 6 → the screw hole 27a of the receiving plate 27 in FIG. The inner surface of the bead portion of the raw tire 51 has some irregularities due to manufacturing reasons, but during vulcanization, each sector 12, 17, 22, 2
Since the tire is compressed by the tires 5 and 34, the vulcanized tire 52 having the required accuracy can be obtained.

When vulcanization is completed in the state shown in FIG. 13, the fluid cylinder 9 is operated in the extension direction, then the fluid pressure cylinder 4 is operated to level the drain discharge nozzle 6, and
Swing in each sector 12, 17, 22, 25,
34 is contracted vertically and radially. Next, the upper mold 44 is raised, and the vulcanized tire 52 is transferred out of the machine, thereby completing one cycle of tire vulcanization.

[0025]

The center mechanism of the bladderless tire vulcanizer of the present invention is constructed as described above. The vulcanizer between the upper and lower dies is raised by raising the upper die from the lower die. Carry in the center position, then raise and lower the upper and lower sectors, insert them into the raw tires, center the raw tires, expand the upper and lower sectors, contact the inner periphery of the raw tires, and discharge the drain. Swing and tilt the nozzle outward to bring the nozzle opening into contact with the inner surface of the green tire, then lower the upper and lower sectors and the upper mold, and use the upper and lower sectors to move the upper and lower beads of the raw tire to the upper and lower molds. Pressing into the bead portion completes the sealing of this portion, and then vulcanizing the raw tire by introducing a vulcanizing medium into the raw tire. At this time,
Since the drain generated in the concave portion of the raw tire is discharged from the drain discharge nozzle to the outside, the following effects can be achieved. That is,
A consumable bladder can be eliminated. Bladder damage,
The defective rate of the tire due to deformation can be reduced. It is not necessary to apply a lubricant to the inner surface of the tire. Since the upper and lower sectors are a set of central mechanisms, cost reduction and maintenance improvement can be achieved. The centering of the raw tire can be performed accurately. To press-fit the bead part,
Tire quality can be improved. The accuracy of the bead inner surface can be improved. A low-cost drainage mechanism in the tire can be obtained. By draining the inside of the tire, the quality of the tire can be improved (the temperature distribution can be made constant).

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing one embodiment of a central mechanism of a bladderless tire vulcanizer of the present invention.

FIG. 2 is a cross-sectional plan view taken along line II in FIG.

FIG. 3 is a cross-sectional bottom view taken along a roll line in FIG. 1;

4A is a vertical side view of a spring box, and FIG. 4B is a bottom view thereof.

FIG. 5 is a longitudinal sectional side view showing a state where a spring of a spring box is compressed by an external force.

FIG. 6 is a vertical sectional side view showing a state in which a drain discharge nozzle is held horizontally by a nozzle plate.

FIG. 7 is a vertical sectional side view showing a state where the drain discharge nozzle is inclined by moving the nozzle plate upward.

FIG. 8 is a plan view of a drain discharge nozzle.

FIG. 9 is a plan view showing a state where a drain discharge nozzle swings around a pin and moves to a predetermined position with expansion of a lower sector.

FIG. 10 is a plan view showing a state where each sector is expanded and changed into a circle.

FIG. 11 is a diagram illustrating the operation of a bladderless tire vulcanizer.

FIG. 12 is a diagram illustrating the operation of a bladderless tire vulcanizer.

FIG. 13 is a diagram illustrating the operation of a bladderless tire vulcanizer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inner shaft 2 Pin 3 Snap ring 4 Fluid pressure cylinder 5 Outer shaft 6 Nozzle 7 Pin 8 Fluid pressure cylinder 9 Fluid pressure cylinder 10 O ring 11 Nozzle plate 12 Upper sector 13 Spring box 14 Spacer 15 Upper plate 16 Bolt 17 Lower sector 18 Lower plate 19 Pin 20 Middle plate 21 Roller 22 Lower sector 23 Spacer 24 Bolt 25 Upper sector 26 Roller 27 Receiving plate 28 O-ring 29 Plate 30 Bracket 31 Bolt 32 Pin 33 Link 34 Lower sector 35 Spring 41 Bolster 42 Upper heat insulating plate 43 Upper Hot plate 44 Upper die 45 O-ring 46 Base 47 Lower heat insulating plate 48 Lower heat plate 49 Lower die 50 Loader 51 Raw tire 52 Vulcanized tire

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B29C 33/02-33/04 B29C 35/02-35/04

Claims (2)

(57) [Claims] 1. A vertically beads of the tire performs shaping of the bead portion with seals pressurized硫媒body pressed against the mold shrinkage, and extensible vertically sectors, and operation mechanism of the sector, before
The upper and lower sectors are stored in the upper and lower sectors when contracted,
Automatically swings and tilts outward when expanding vertical sectors
A drain discharge nozzle for draining the inside of the tire, and a central mechanism of the bladderless tire vulcanizer. 2. The central mechanism of a bladderless tire vulcanizer according to claim 1, wherein the upper and lower sectors and the operation mechanism of the sector are arranged at the center of the tire vulcanizer so as to be able to move up and down.