JP3364170B2 - Tire vulcanizer - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an improvement in a tire vulcanizer for vulcanizing a pneumatic tire.

[0002]

2. Description of the Related Art During tire vulcanization, the action of a pressurized heating medium (steam, hot water, or a mixture of steam and inert gas) introduced inside the tire generates a force for opening the tire mold. The tire vulcanizer is equipped with a mold clamping device for holding the tire mold in a closed state against the force, and it is known to use a hydraulic cylinder as one type of the mold clamping device. is there. The applicant of the present invention can easily perform the arrangement of the tire unloading device and the tire mold exchanging work,
An improved technique capable of reducing the number of parts without deteriorating the stability of the tire vulcanizer has already been disclosed in JP-A-8-
It is disclosed in Japanese Patent No. 258049.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
According to the technique disclosed in Japanese Patent No. 049, the tire loading / unloading device can be easily arranged, and other effects are exhibited. However, in the tire vulcanizing press, a lock housing for attaching and detaching the column and the pressure cylinder is formed as an integral structure at the tip of the piston rod of the pressure cylinder. Therefore, in maintaining the mold clamping cylinder such as replacing the seal member, the inconvenience remains that the pressure cylinder must be disassembled and reassembled at the installation location of the tire vulcanizer. Moreover, since the lock housing is attached to the tip of the piston rod, the cost of the pressurizing cylinder remains high. The present invention has improved such problems, and can be removed without disassembling the mold clamping hydraulic cylinder, and hinders tire loading and unloading and tire mold replacement work when the tire mold is released or replaced. An object is to provide an inexpensive tire vulcanizer that does not come.

[0004]

SUMMARY OF THE INVENTION The present invention comprises a base of a vulcanizer, a bolster plate to which an upper mold part of a tire mold can be assembled, which can be lifted up and down by a guide installed upright on the base. A bottom plate provided to the base so as to be able to move up and down, to which the lower mold part of the tire mold is assembled, one end of which is assembled to the bottom plate, and the other end of which is assembled to the base, and the inside of the tire being vulcanized A plurality of hydraulic cylinders for clamping to hold the tire mold closed against the force of opening the tire mold generated by the action of the pressurizing and heating medium introduced into A plurality of tie rods fixed to a bolster plate and having the other end removably attached to the base, and the mold clamping hydraulic cylinder is arranged at a position deviated from the center of the tie rods; When releasing the mold Ku is the time of replacement, the tie rod is configured to increase with the bolster plate. Further, in the present invention, the lower end of the tie rod is configured to penetrate the base. Further, in the present invention, the assembling pitch circle diameter of the mold clamping hydraulic cylinder is set to be equal to or smaller than the outer diameter of the maximum tire mold assembled in the vulcanizer. Further, in the present invention, the same number of mold clamping hydraulic cylinders and tie rods are provided. Further, in the present invention, three sets of the mold clamping hydraulic cylinders and the tie rods are arranged on one surface of the tire mold. Also,
In the present invention, even if the hydraulic pressure of the mold clamping hydraulic cylinder may be lowered during tire vulcanization, in order to prevent the occurrence of a pressurized heating medium ejection trouble inside the tire, A safety device having a plurality of screw rods that can be raised to a position immediately before contacting the lower surface of the bottom plate and that can move up and down in synchronization with each other is installed between the plurality of mold clamping hydraulic cylinders.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The structure 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 cutaway front view of a tire vulcanizer according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along line I-I in FIG. 1. Further, a thick tire mold is attached to the left side of the line Y-Y in FIG. 1, and a thin tire mold is attached to the right side thereof, both of which show the closed state of the tire mold. As shown in FIG. 1, in a tire vulcanizer 20 of the present embodiment, a base 1 is provided on an upper part of a mounting base 2, and a guide column 3 is vertically erected and fixed to the base 1. There is. A bolster plate 4 is provided on the guide column 3 at a position above the base 1 so as to face the bolster plate 4, and the bolster plate 4 is connected to a tip of a piston rod of a lifting cylinder 5 fixed to the guide column 3. By operating the elevating cylinder 5, the elevating cylinder 5 is moved up and down with the guide column 3 as a guide. Further, the tire mold M is arranged on both left and right sides with the guide columns 3 interposed therebetween, and two surfaces having different thicknesses are mounted on the base 1.

An upper end (one end) of the shaft-shaped tie rod 6 is fixed to the bolster plate 4, and in this embodiment, as shown in FIG. 2, one side of the tire mold M has a center C of the tire mold M. On the other hand, three are fixed on the same circumference at equal angular intervals. Lower end (other end) of tie rod 6
1, is configured to penetrate the base 1, and is detachably assembled to the base 1 by the action of a cotter 7 which is moved by a driving means (not shown). Therefore, the tie rod 6 is configured to rise together with the bolster plate 4 when the tire mold M is released or replaced. The upper heating plate 9 is fixed to the bolster plate 4 by a known means via the heat insulating plate 8. The annular bottom plate 12 is attached to the base 1 so as to be able to move up and down via a guide member (not shown). The lower heating plate 10 is fixed to the bottom plate 12 by a known means via a heat insulating plate 11. The tire mold M is composed of a pair of upper and lower mold parts for tire vulcanization, and the upper half Ma is the upper hot plate 9
The lower half Mb is bolted to the lower heating plate 10.

The mold clamping hydraulic cylinder 13 resists against the force for opening the tire mold M generated by the action of the pressurizing and heating medium introduced inside the tire during vulcanization. M
Are provided in order to maintain the closed state, and three sets of the same number as the tie rods 6 are bolted to the base 1. The tip of the piston rod 13 a of the mold clamping hydraulic cylinder 13 is detachably connected to the bottom plate 12 side 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 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. Has been done. Moreover, the assembly pitch circle diameter D of the mold clamping hydraulic cylinder 13
Is less than or equal to the outer diameter of the maximum tire mold that can be mounted on the tire vulcanizer 20. The screw rod 15 is the tire mold center C.
On the other hand, the tightening hydraulic cylinders 13 are arranged at the intermediate angle position and are screwed to the base 1 to serve as a known safety stopper. That is, the threaded rods 15 are rotated by the drive of the drive means 17 assembled to the base 1 via the chains 16 that are respectively stretched over the threaded rods 15, whereby the threaded rods 15 are rotated from the base 1 of the threaded rods 15. The length of the protruding portion is configured to expand and contract in the vertical direction.

Next, the tire vulcanizer 2 according to the present embodiment.
The operation of 0 will be described. When replacing the tire mold M,
The bolts (not shown) fixed to the upper and lower heating plates 9 and 10 are removed, the screw rod 15 is lowered by the rotational driving of the driving means 17, and then the mold clamping hydraulic cylinder 13 is operated, whereby the bottom plate 12 To lower. As a result, the tire mold M descends 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 lower end of the tie rod 6 and the base 1, the lifting cylinder 5 is operated to raise the bolster plate 4 and the tie rod 6, and thereafter, by a known transportation means such as a forklift. The used tire mold M is hung, and the tire mold M to be used next is hung and aligned.

When the suspension alignment of the tire mold M is completed, the bolster plate 4 is lowered in the reverse order of the above, and the lower end of the tie rod 6 is put through the cotter 7 into the base 1.
, The bottom plate 12 is lifted to bring the tire mold M into contact with the upper heating plate 9, and then the upper half Ma of the tire mold M is bolted to the upper heating plate 9 to lower the lower half Mb. The lower heating plate 1
Bolt to 0. Next, the driving means 17 is rotated in the opposite direction to raise the screw rod 15, and the raising of the screw rod 15 is stopped immediately before the upper end of the screw rod 15 comes into contact with the lower surface of the bottom plate 12. The replacement work of the mold M is completed. Although a sensor is incorporated to stop the screw rod 15 from rising, its illustration is omitted. After the tire mold M has been mounted or replaced, if necessary, the tire mold M is preheated, the cotter 7 is removed by a known procedure, and the lifting cylinder 5 raises the bolster plate 4. Then, the tire mold M is opened and the unvulcanized tire M to be subsequently vulcanized is carried in. After that, the tire mold M
Is closed, the lower end of the tie rod 6 and the base 1 are connected via the cotter 7, the pressure liquid is introduced into the mold clamping hydraulic cylinder 13, and the pressurized heating medium is applied to the inside of the tire after entering the mold clamping state. Introduce and enter the vulcanization process.

In the bottom plate 12 during normal vulcanization, the pressing force generated by the action of the pressurizing and heating medium introduced inside the tire causes the lower half Mb of the tire mold M and the lower heating plate 10.
Act through. Due to the action of the mold clamping hydraulic cylinder 13, a push-up force equal to or greater than the push-down force is generated to maintain the closed state of the tire mold M, and the action of the force causes the bottom plate 12 to elastically deform. Assembling pitch circle diameter D of hydraulic cylinder 13 for mold clamping to minimize deformation
Are arranged as described above, the bottom plate 12
The amount of elastic deformation of is small. Even if the hydraulic pressure for the hydraulic cylinder 13 is lowered during the tire vulcanization and the piston rod 13a of the cylinder 13 is pushed back, the bottom plate 12 abuts on the threaded rod 15 and the tire metal. The opening of the mold M is limited to the minimum, and the ejection trouble of the pressurized heating medium inside the tire is prevented.

Since 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 through the base 1, the cotter 7, the tie rods 6 and the like, the reaction force is applied to the base 1. (Stress) occurs. If the center of the mold clamping hydraulic cylinder 13 is arranged near the surface including the center of the tie rod 6 and the center of the tire mold M, the same stress value is reduced. Therefore, the mold clamping hydraulic cylinder 13 is installed. Number is tie rod 6
It is desirable that the number is the same as the number of installed. Further, if the center of the mold clamping hydraulic cylinder 13 is brought closer to the center of the tie rod 6, the same stress value becomes smaller. However, if the center is too close, the amount of elastic deformation of the bottom plate 12 increases, so the mold clamping hydraulic cylinder 13 is made. There is an optimum value for the assembling pitch circle diameter D of
Considering that the size of the tire to be vulcanized is changed by exchanging the tire mold M, the assembling pitch circle diameter D is appropriately smaller than or equal to the maximum outer diameter of the tire mold M assembled in the tire vulcanizer 20. It is desirable to set the value to a value, and the plate thickness can be made thin so that the stress or the like can be kept within an allowable value, and the member weight can be reduced.

If two tie rods 6 are provided on one side of the tire mold M, that is, two sets of mold clamping hydraulic cylinders 13, the 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 4 or more per one surface of the tire mold M, the mold clamping reaction force is biased to two of the tie rods 6 due to a processing and assembling error of the tie rod 6 and the like, and an unexpected stress is generated. Something happens. By using three tie rods, the mold clamping is stable, the mold clamping reaction force is distributed to each tie rod 6 as planned, and the tire loading / unloading device is easily arranged and other functions are impaired. Nothing.

As described above, according to the present embodiment, the mold clamping hydraulic cylinder 13 is attached to the base 1 from the center of the tie rod 6 that detachably connects the bolster plate 4 and the base 1. By setting it to the off position,
It is not necessary 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 attached to or removed from the base 1 in the assembled state. . Also,
A screw rod 15 as a safety stopper is arranged in the middle of each mold clamping hydraulic cylinder 13, and a chain is hung on each screw rod 15 to make them rotatable at the same time, depending on the thickness of the tire mold M to be used. If the length of the screw rod 15 protruding from the upper surface of the base 1 is appropriately adjusted, even if the hydraulic pressure of the mold clamping hydraulic cylinder 13 is reduced during tire vulcanization, the bottom plate 12 is screwed. By contacting the rod 15, the tire mold M
Is restricted, and ejection of the pressurized heating medium inside the tire is prevented. The fulcrum of the bottom plate 12 to which the lower half Mb of the tire mold M is assembled, that is, the pitch circle diameter at the mounting center of the piston rod 13a of the hydraulic cylinder 13 for mold clamping, is elastically deformed with respect to the same bottom plate 12. There is a value that minimizes the amount, which is midway between the outer diameter and the inner diameter of the annular bottom plate 12. Further, when the center of the mold clamping hydraulic cylinder 13 is arranged near the surface 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 mold clamping hydraulic pressure is reduced. The stress is also reduced by bringing the center of the cylinder closer to the center of the tie rod.

By combining these actions, the number of mold clamping hydraulic cylinders 13 is made equal to that of the tie rods 6, and the assembling pitch circle diameter D of the mold clamping hydraulic cylinders 13 is set to the maximum tire mold M that can be mounted. With an appropriate value equal to or less than the outer diameter, there is an effect that the weight of the members of the bottom plate 12 and the base 1 can be reduced. When the number of the tie rods 6 is two per one side of the tire mold M, that is, when the number of the mold clamping hydraulic cylinders 13 is two per one side of the tire mold M, the tie rod 6 and other processing and assembly errors, the bottom plate 12, and the like. The mold clamping becomes unstable due to the bending of the
There is a problem that the mold clamping reaction force is biased to two of them, which may cause unexpected stress.
If three are used, the mold clamping reaction force is distributed to each tie rod 6 as planned, which is convenient. Further, the tire loading / unloading device can be easily arranged, and other functions and effects are not impaired. In addition, since the tire rod 6 ascends together with the bolster plate 4 when the tire mold M is released or replaced, the tire rod 6 does not interfere with the tire loading / unloading and the tire mold M replacement work.

Although the tire vulcanizer according to the embodiment of the present invention has been described above, the present invention is not limited to these, and various modifications can be made based on the technical idea of the present invention. .

[0016]

As is apparent from the above description, the tire vulcanizer of the present invention is capable of moving up and down with the guide of the base of the vulcanizer and the columns standing on the base, and the upper mold of the tire mold. A bolster plate to which parts are assembled, a bottom plate that is provided to the base so as to be able to move up and down, and to which the lower mold part of the tire mold is assembled, and one end to the bottom plate and the other end to the base. And a plurality of mold clampings for holding the tire mold in a closed state against the force for opening the tire mold generated by the action of the pressure heating medium introduced inside the tire during vulcanization. A hydraulic cylinder for use and a plurality of tie rods having one end fixed to the bolster plate and the other end removably attached to the base, and the hydraulic cylinder for mold clamping is removed from the center of the tie rod. Placed in position , During disengagement or replace the tire mold, since the tie rod is configured to increase with the bolster plate, the following effects can be obtained. That is, according to the present invention, it is possible to remove the mold clamping hydraulic cylinder from the tire vulcanizer and move it to another place for maintenance without disassembling the mold clamping hydraulic cylinder. It is no longer necessary to form a perfect shape. Therefore, if you have a spare cylinder, the tire vulcanizer for maintenance of the mold clamping hydraulic cylinder will be stopped only for the time required to replace the mold clamping hydraulic cylinder. The operating rate of can be significantly increased. In addition, it is possible to reduce the weight of the members of the base and the bottom plate required to obtain the same strength. Further, when the tire mold is released or replaced, the tie rod moves upward and does not exist around the tire mold, so that there is no hindrance to tire loading / unloading and tire mold replacement work. In addition, the tire loading / unloading work and the tire mold replacement work can be smoothly performed, and the productivity can be improved. Furthermore, it is easy to use three tie rods on one surface of the tire mold and three hydraulic cylinders for mold clamping. By using three tie rods, the tire loading / unloading device can be easily arranged. Can be done without impairing other effects.

[Brief description of drawings]

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

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

[Explanation of symbols]

1 base 2 Installation frame 3 guide columns 4 bolster plate 5 Lifting cylinder 6 Tie rod 7 cotta 12 Bottom plate 13 Hydraulic cylinder for mold clamping 15 screw rod 17 Drive means Assembling pitch cylinder diameter of hydraulic cylinder for D clamping M tire mold

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Claims (6)

(57) [Claims] 1. A vulcanizer base and a bolster plate on which the upper mold part of a tire mold is assembled, and a bolster plate on which the base of the vulcanizer can be lifted and lowered by a guide, and which can be lifted and lowered on the base. A bottom plate to which the lower mold part of the tire mold is assembled, and one end of the bottom plate,
And the other end is assembled to the base, the tire mold against the force to open the tire mold generated by the action of the pressure heating medium introduced inward of the tire during vulcanization A plurality of mold clamping hydraulic cylinders held in a closed state; and a plurality of tie rods having one end fixed to the bolster plate and the other end detachably attached to the base,
The mold clamping hydraulic cylinder is arranged at a position deviated from the center of the tie rod, and the tie rod rises together with the bolster plate when the tire mold is released or replaced. Tire vulcanizer. 2. The lower end of the tie rod is configured to penetrate the base.
The tire vulcanizer described in. 3. An assembly pitch circle diameter of the mold clamping hydraulic cylinder is set to be equal to or smaller than an outer diameter of a maximum tire mold assembled in the vulcanizer.
The tire vulcanizer described in. 4. The tire vulcanizer according to claim 1, wherein the mold clamping hydraulic cylinders and the tie rods are provided in the same number. 5. The tire vulcanizing according to claim 1, wherein three sets of the mold clamping hydraulic cylinder and the tie rod are provided on one surface of the tire mold. Machine. 6. A plurality of screw rods, which can be raised to a position immediately before contacting the lower surface of the bottom plate and can be raised and lowered in synchronization with each other, between the plurality of mold clamping hydraulic cylinders of the base. The tire vulcanizer according to any one of claims 1 to 5, further comprising a safety device.