JPH1110649A - Tire vulcanizing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove a hydraulic cylinder for clamping a tire vulcanizing machine without disassembling. SOLUTION: A guide pillar 3 is fixed to a base 1 of a tire vulcanizing machine 20. A bolster plate 4 is provided on the guide pillar 3 to move vertically. One end of each axis-shaped tie rod 6 is fixed to the bolster plate 4, and three tie rods are fixed to one surface of a tire mold M. The other end of each tie rod 6 is removably fixed to the base 1 by action of a cotter 7. An upper half Ma of the tire mold M is bolted to an upper heating plate 9, and a lower half Mb is bolted to a lower heating plate 10. Hydraulic cylinders 13 for clamping the equal number of sets to that of the tie rods 6 are bolted to the base 1, and the assembling pitch circle diameter of the cylinder 13 is smaller than the outer diameter of a fittable maximum tire mold.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a tire vulcanizer for vulcanizing a pneumatic tire.

[0002]

2. Description of the Related Art During the vulcanization of a tire, a force to open a tire mold is generated by the action of a heating and pressurizing medium (steam, hot water, or a mixture of steam and inert gas) introduced into the tire. Tire vulcanizers are equipped with a mold clamping device to hold the tire mold in a closed state against the force, and a type using a hydraulic cylinder as a type of the mold clamping device is known. is there. The present applicant can also easily perform the arrangement of the tire unloading device and the tire mold replacement work,
An improved technique capable of reducing the number of parts without deteriorating the stability of a tire vulcanizer has already been disclosed in Japanese Patent Laid-Open No. 8-2.
58049 discloses this.

[0003]

SUMMARY OF THE INVENTION The above-mentioned Japanese Patent Application Laid-Open No. 8-258 is disclosed.
According to the technology disclosed in Japanese Patent No. 049, the arrangement of the tire loading / unloading device can be easily performed, and other effects are exhibited. However, in the tire vulcanizing press, a lock housing for attaching and detaching the column and the pressurizing cylinder is formed integrally with the distal end of the piston rod of the pressurizing cylinder. For this reason, in the maintenance of the mold clamping cylinder, such as replacement of the seal member, there is a disadvantage that the pressure cylinder must be disassembled and reassembled at the installation location of the tire vulcanizer. Further, since the lock housing is attached to the tip of the piston rod, there remains a problem that the cost of the pressurizing cylinder is relatively high.
An object of the present invention is to provide an inexpensive tire vulcanizer in which such problems are improved.

[0004]

According to the present invention, there is provided a bolster plate capable of ascending and descending by assembling an upper mold portion of a tire mold and using a guide column erected on a base as a guide. A bottom plate to be assembled, a plurality of mold clamping hydraulic cylinders having one end attached to the bottom plate, the other end attached to the base, and one end fixed to the bolster plate (or base), and the other end It is equipped with a plurality of tie rods configured to be detachable from the base (or bolster plate). Further, in the present invention, the number of the hydraulic cylinders for mold clamping is the same as the number of the tie rods, and the pitch circle diameter of the hydraulic cylinders is less than or equal to the outer diameter of the maximum mounting tire mold. In addition, the present invention provides the mold clamping hydraulic cylinder and the tie rods in three sets per one surface of the tire mold, wherein the mold clamping hydraulic cylinders are mounted at positions off the center of the tie rods, and the same number as the plurality of tie rods. A set of mold clamping hydraulic cylinders is assembled on the base, and the cylinder mounting pitch circle diameter is set to be equal to or less than the outer diameter of the tire mold. Further, the present invention provides a stabilizing device for preventing the occurrence of a trouble in which the heating and pressurizing medium is ejected inside the tire even if the hydraulic pressure of the mold clamping hydraulic cylinder is reduced during tire vulcanization. It has a rod shape and is placed in the middle of the hydraulic cylinder for mold clamping. A plurality of the same screw rods are chained to enable simultaneous rotation.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of a tire vulcanizer according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a partially broken front view of the tire vulcanizer of the present invention, and FIG. 2 is a cross-sectional view taken along line II in FIG.
The left side from the line YY in FIG. 1 shows a state in which a thick tire mold is mounted, and the right side shows a state in which a thin tire mold is mounted. As shown in FIG. 1, the tire vulcanizer 20 includes a base 1
And a guide column 3 is fixed to the base 1 so as to stand upright in the vertical direction. A bolster plate 4 is provided on the guide support 3 so as to face the base 1. The bolster plate 4 is connected to a tip of a piston rod of a lift cylinder 5 fixed to the guide support 3, and the lift cylinder 5 operates. Then, the guide column 3 is moved up and down as a guide.

[0006] One end of the axial tie rod 6 is fixed to the bolster plate 4, and in this embodiment, as shown in FIG. Three are fixed at equal angular intervals on the same circumference. The other end of the tie rod 6 is detachable from the base 1 by the action of a cotter 7 that is moved by a driving means (not shown). The upper heating plate 9 is fixed to the bolster plate 4 via a heat insulating plate 8 by a known means. The annular bottom plate 12 is attached to the base 1 via a guide member (not shown) so as to be able to move up and down. The lower heating plate 10 is fixed to the bottom plate 12 via a heat insulating plate 11 by a known means. The tire mold M is a pair of molds for vulcanizing tires. The upper half Ma is bolted to the upper hot plate 9 and the lower half Mb is bolted to the lower hot plate 10.

The mold clamping hydraulic cylinder 13 is provided with a tie rod 6.
The same three sets are bolted to the base 1.
The tip of the piston rod 13 a of the mold-clamping hydraulic cylinder 13 is separably connected to the bottom plate 12 via a flange 14. As shown in FIG. 2, the positional relationship between the tie rod 6 and the mold clamping hydraulic cylinder 13 is such that the tie rod 6 and the mold clamping hydraulic cylinder 13 are arranged in the same radial direction from the tire mold center C, and the mold clamping hydraulic cylinder 13 is arranged inside the tie rod 6. Have been. The assembling pitch circle diameter D of the mold-clamping hydraulic cylinder 13 is set to be equal to or less than the outer diameter of the largest tire mold that can be mounted on the tire vulcanizer 20. The screw rod 15 is disposed at a position at an intermediate angle of each of the tightening hydraulic cylinders 13 with respect to the tire mold center C, and functions as a well-known safety stopper by being screwed to the base 1. That is, the screw rods 15 are rotated by the driving means 17 mounted on the base 1 via the tune 16 bridged over the respective screw rods 15, whereby the respective screw rods 15 rotate, and the base 1 of the screw rod 15 is rotated. The length of the portion protruding from the vertical direction expands and contracts.

Next, the operation of the present embodiment will be described. When replacing the tire mold M, the mold M should be
The bolt (not shown) fixed to 0 is removed, the screw rod 15 is lowered by the rotation of the driving means 17, and then the bottom plate 12 is lowered by operating the hydraulic cylinder 13. Thus, the mold M moves down together with the bottom plate 12 and separates from the upper heating plate 9. next,
The cotter 7 is moved to release the connection between the tie rod 6 and the base 1, and the lifting cylinder 5 is operated to raise the bolster plate 4, and then the used tire mold M is lifted out by a known transportation means, for example, a forklift or the like. Then, the suspension die alignment of the tire mold M to be used next is performed.

When the suspension alignment of the tire mold M is completed,
The bolster plate 4 is lowered in the reverse order to the above, the tie rod 6 is connected to the base 1 via the cotter 7, the bottom plate 12 is raised, and the tire mold M is brought into contact with the upper hot plate 9, and then the same. The upper half Ma of the mold M is bolted to the upper heating plate 9 and the lower half Mb is bolted to the lower heating plate 10. Next, the driving means 17 is rotated in the reverse direction to raise the screw rod 15, and immediately before the upper end of the screw rod 15 comes into contact with the bottom plate 12, the lifting of the screw rod is stopped, and the tire mold M replacement operation is completed. . Although a sensor is incorporated for stopping the screw rod 15 from rising, it is not shown. When the mounting or replacement of the tire mold M is completed, if necessary, the tire mold M is preheated, the cotter 7 is removed by a known procedure, and the bolster plate 4 is raised by the lifting cylinder 5. The mold M is opened, an unvulcanized tire to be cured next is carried in, the mold M is closed, and the tie rod 6 and the base 1 are
And pressurized liquid is introduced into the cylinder 13, and after entering a mold clamping state, a heating and pressurizing medium is introduced into the tire to enter a vulcanization step.

[0010] A pressing force generated by the action of the heating and pressurizing medium introduced into the tire is applied to the bottom plate 12 during normal vulcanization by the lower half Mb of the tire mold M and the lower heating plate 10.
Act through. The closed state of the tire mold M is maintained by generating a pushing force equal to or more than the same pressing force by the action of the cylinder 13.
2 is elastically deformed, but the pitch circular diameter D of the assembling hydraulic cylinder 13 is arranged as described above so as to minimize the deformation, so that the amount of elastic deformation of the bottom plate 12 is reduced. During vulcanization of the tire, even if the hydraulic pressure for the cylinder 13 drops and the piston rod 13a of the cylinder 13 is pushed back, the bottom plate 12 abuts on the screw rod 15 and the tire mold M The opening is limited to a minimum, and the ejection trouble of the heating and pressurizing medium inside the tire is prevented.

The reaction force of the output of the mold clamping hydraulic cylinder 13 is transmitted to the upper half Ma of the tire mold M via the base 1, the cotter 7, the tie rod 6, and the like. (Stress) occurs. When the center of the hydraulic cylinder for mold clamping 13 is arranged close to the plane including the center of the tie rod 6 and the center of the tire mold M, the stress value becomes small. It is desirable that the number is the same as the number of the tie rods 6. When the center of the mold clamping hydraulic cylinder 13 is brought closer to the center of the tie rod 6, the stress value becomes smaller.
Since the elastic deformation amount of the mold clamping hydraulic cylinder 1 increases,
There is an optimum value for the pitch circle diameter D for assembling the mold-clamping hydraulic cylinder 13 of No. 3 and considering that the size of the vulcanized tire changes due to the replacement of the tire mold M, the diameter D is It is preferable that the thickness is set to an appropriate value equal to or less than the maximum outer diameter of the tire mold to be assembled to the sulfuring machine 20, and the plate thickness can be reduced in order to keep the stress and the like within an allowable value, so that the weight of the member can be reduced.

The tie rods 6 are attached to one side of the tire mold M by two.
When two sets of the hydraulic cylinders 13 for mold clamping are used, mold clamping becomes unstable and the amount of elastic deformation of the bottom plate 12 increases. On the other hand, if the number of the tie rods 6 is four or more per one surface of the tire mold, the mold clamping reaction force is biased to two of the tie rods 6 due to an error in processing and assembling the tie rods 6, and
It may cause unexpected stress. By using three tie rods, the mold clamping is stabilized, and the distribution of the mold clamping reaction force to each tie rod 6 becomes as planned, and the arrangement of the tire loading / unloading device is easily performed, and other functions are impaired. Not even.

As described above, according to the present embodiment, the mounting of the mold-clamping hydraulic cylinder 13 to the base 1
By setting the bolster plate 4 and the base 1 at a position deviated from the center of the tie rod 4 for detachably connecting the base 1,
There is no need to form a lock housing at the tip of the piston rod of the mold-clamping hydraulic cylinder 13, and the mold-clamping hydraulic cylinder 13 can be assembled and removed from the base 1 in an assembled state. A screw rod 15 serving as a safety stopper is disposed in the middle of each hydraulic cylinder 13 for clamping, and a chain is hung on each screw rod 15 so that they can be rotated simultaneously. If the length of the screw rod 15 coming out from the upper surface of the bottom plate 1 is properly adjusted, even if the hydraulic pressure of the hydraulic cylinder 13 for mold clamping decreases during tire vulcanization,
2 comes into contact with the threaded rod 15 to limit the opening of the tire mold M, and the ejection of the heated and pressurized medium inside the tire is prevented. The fulcrum of the bottom plate 12 for assembling the lower mold Mb portion of the tire mold M, that is, the pitch circle diameter of the mounting center of the piston rod 13a of the mold-clamping hydraulic cylinder 13, has an elasticity with respect to the same bottom plate 12. There is a value that minimizes the amount of deformation, and the value is between the outer diameter and the inner diameter of the annular bottom plate 12. Further, when the center of the hydraulic cylinder 13 for mold clamping is arranged close to the plane including the center of the tie rod 6 and the center of the tire mold M, the stress generated in the base 1 is reduced and the hydraulic cylinder for mold clamping is reduced. By bringing the center closer to the center of the tie rod, the stress acts so as to be smaller.

By the combination of these functions, the number of hydraulic cylinders 13 for mold clamping is made the same as the number of tie rods 6, and the pitch circle diameter D of the hydraulic cylinders 13 for mold clamping is determined by the outer diameter of the maximum tire mold M to be mounted. With the following appropriate values, there is also an effect that the weight of the members of the bottom plate 12 and the base 1 can be reduced. Two tie rods 6 per tire mold, that is, two mold clamping hydraulic cylinders 13 per tire mold
In the case of a set, the mold clamping becomes unstable due to erroneous processing and assembly of the tie rods 6 and other parts, the bottom plate 12 and other deflections, and when four or more tie rods 6 are used, the mold clamping reaction force is biased to two of them. However, there is a problem that unscheduled stress may be generated, but if three tie rods 6 are used, the distribution of the mold clamping reaction force to each tie rod 6 is as planned, which is convenient. Further, the arrangement of the tire loading / unloading device is not easily performed, and other functions and effects are not impaired.

Although the tire vulcanizer according to the embodiment of the present invention has been described above, the present invention is, of course, not limited to these, and various modifications are possible based on the technical idea of the present invention. . For example, in the above-described embodiment, one end of the tie rod 6 is fixed to the bolster plate 4, and the other end of the base 1 is detachable.
The side may be fixed.

[0016]

As is apparent from the above description, according to the present invention, the mold clamping hydraulic cylinder can be removed from the tire vulcanizer without disassembly and moved to another place for maintenance. There is no need to form the tip end of the piston rod of the pressure cylinder into a special shape. Therefore, if a spare cylinder is retained, the tire vulcanizer will be stopped for maintenance of the hydraulic cylinder for mold clamping only by the time required for replacing the hydraulic cylinder for mold clamping. It can be greatly improved. In addition, it is possible to reduce the weight of the base and bottom plate members required to obtain the same strength. Further, it is easy to use three tie rods on one surface of the tire mold and three hydraulic cylinders for mold clamping, and to easily arrange the tire loading / unloading device by using three tie rods. Can be performed without impairing other effects.

[Brief description of the drawings]

FIG. 1 is a front view of a tire vulcanizer according to an embodiment of the present invention.

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base 3 Guide support 4 Bolster plate 5 Elevating cylinder 6 Tie rod 7 Cotta 12 Bottom plate 13 Hydraulic cylinder for mold clamping 15 Screw rod D Pitch circle diameter with hydraulic cylinder for mold clamping M Tire mold

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI B29L 30:00

Claims (5)

[Claims] 1. A vulcanizer base, and a bolster plate on which a pillar standing upright on the base can be raised and lowered by a guide, and an upper mold portion of a tire mold is mounted, and is provided on the base so as to be vertically movable. A bottom plate on which the lower mold portion of the tire mold is assembled, and one end on the bottom plate,
The other end is fixed to one of the bolster plate or the base, and the other end is detachably attached to the other of the bolster plate or the base. A tire vulcanizer, comprising: a plurality of tie rods, wherein the hydraulic cylinder for mold clamping is disposed at a position off the center of the tie rods. 2. The tire according to claim 1, wherein an assembly pitch circle diameter of the mold-clamping hydraulic cylinder is equal to or less than an outer diameter of a maximum tire mold assembled to the vulcanizer. Vulcanizer. 3. The tire vulcanizer according to claim 1, wherein the same number of the mold-clamping hydraulic cylinders and the tie rods are provided. 4. The tire vulcanizer according to claim 1, wherein three sets of the mold-clamping hydraulic cylinder and the tie rod are arranged on one surface of the tire mold. . 5. A plurality of screw rods which can be raised to a position immediately before contacting the lower surface of the bottom plate and which can be moved up and down in synchronization with each other between the plurality of hydraulic cylinders for clamping of the base. The tire vulcanizer according to claim 1, further comprising a safety device.