JPH0416324B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydraulic tire vulcanizer that applies clamping force to a tire mold using a hydraulic cylinder.

In conventional hydraulic tire vulcanizing machines, cylinders have been used as means for opening and closing (elevating and lowering) the upper mold. In the case of cylinder drive, the relatively narrow space around the vulcanizer is occupied by the piping connected to these cylinders, and the operating medium of the cylinder may leak from the cylinder seals, piping joints, etc. There is a possibility that it will be released, so a lot of effort and attention must be spent on this maintenance. or,
If a large amount of cylinder operating medium leaks from the piping line, the upper lifting device (upper mold, upper heating plate, upper bolster plate, etc.) may come down from a high position due to its own weight, and the vulcanizer From the standpoint of driver safety, it is not necessarily desirable to use cylinders to open and close the vulcanizer.

Furthermore, when two or more lifting cylinders are used for one mold, it is necessary to pay considerable attention to synchronization control in order to maintain the parallelism of the mold.

Therefore, the present invention was made for the purpose of eliminating the above-mentioned drawbacks caused by the cylinder lift drive.
A screw rod for lifting and lowering and a drive device for rotationally driving it are adopted for the lifting and lowering drive, and when a clamping force is applied to the mold of the vulcanizer by a pressure cylinder, a large amount of force is applied to the screw for lifting and lowering. In order to prevent damage to the screw due to excessive tightening force, a spring with an appropriate spring force is interposed between the drive nut, which has been given an appropriate stroke, and the bolster plate, which moves up and down with the upper mold part. The present invention provides a tire vulcanizer characterized by the following features.

The present invention will be explained based on a first embodiment shown in FIGS. 1 to 4.

The tire vulcanizer includes a frame 1 that supports the pressurizing force of the tire vulcanizer, a tire mold 11 that is divided into upper and lower parts,
A pressure cylinder 2 installed on the base portion 1a of the frame 1 for applying a tightening force to the tire 12, a lower mold support plate (lower bolster plate) 8 that supports the tire lower mold 12 via the lower hot plate 10. , an upper mold support plate (upper bolster plate) 7 for fixing the tire upper mold 11 via the upper hot plate 9, and a tire upper and lower mold 1.
A strut 1 for transmitting the tightening force applied to 1 and 12 to the frame 1 via the upper bolster plate 7
5 and a jam plate 14. Here, when the tire upper mold 11 and the upper bolster plate 7 rise after the completion of vulcanization, the upper bolster plate 7
The pillar 15 that is mounted on and fixed is the frame 1
In order to allow the upper beam 1b to pass through the hole 13 provided at the center and protrude onto the frame 1, an air cylinder or the like (not shown) is provided to move the jamming plate 14 from the center of the press. In this vulcanizer, the upper tire mold 11 is raised and lowered using a bracket 16 fixed to the outer periphery of the upper bolster plate 7 and a disc spring 17 provided on the bracket 16, as shown in FIG.
Bolt/nut 17 to drive nut 18 via
a and 17b, the drive nut 18 is screwed into the lifting threaded rod 5, and this threaded rod is connected to the bevel gear 6.
It is obtained by rotating the electric motor 3 via the speed reducer 4. In addition, in this example, the stroke of the hydraulic cylinder is made small in order to prevent tire internal pressure burst due to the opening of the upper and lower molds when the pressure in the tightening hydraulic cylinder is insufficient, so adjustment is required as the mold thickness changes. is required, and a beam nut 19 and a beam screw 2 are attached to the upper beam 1b of the frame 1.
0, an intermediate screw 22, its driving device 21, etc. are provided.

The upper bolster plate 7 of the vulcanizer, the upper heating plate 9,
The upper mold 11 is integrated to form the frame 1 of the vulcanizer.
When it is located above and open, an unvulcanized tire loading device called a loader (not shown) transports the unvulcanized tire from the outside of the vulcanizer into the lower mold 12 inside the vulcanizer.
A relatively weak steam pressure is applied to the inner surface of the unvulcanized tire C through the bladder B assembled to the post mechanism A provided at the center of the tire lower mold 12 shown in FIG. While the unvulcanized tire C is supported on the lower tire mold 12, the loading device for the unvulcanized tire C is pushed out of the vulcanizer, and then the electric motor 3
The lifting screw rod 5 is rotated to lower the upper bolster plate 7, the upper heating plate 9, and the upper tire mold 11 as one unit. After the tire upper mold 11 contacts the upper bead of the unvulcanized tire C as shown in FIG. 5, the vapor pressure in the bladder B is increased, and the tire upper mold 1
If the downward movement of 1 is continued, an upward force will be applied to the upper bolster plate 7 via the upper hot plate 9. At this time, the lifting screw rod 5 pushes the tire upper mold 11 downward against the upward force, but as shown in FIG. The spring 17 is slightly compressed due to this upward pushing force. This disc spring 17 leaves a sufficient compression allowance until the tire upper mold 11 comes into contact with the lower mold 12.
In this way, the vulcanizer is fully closed by the lifting threaded rod 5, and the jam plate 14 shown in FIG. After closing the through hole 1b, the hydraulic cylinder 2 is pressurized and a tightening force is applied to the upper and lower tire molds 11 and 12. At this time, the gap between the jam plate 14 and the beam screw 20, the gap between the jam plate 14 and the support column 15, and the amount of so-called frame elongation in which the frame 1 stretches or bends due to the pressurizing force. The upper bolster plate 7 is lifted upward by the total amount of deflection. At this time, as shown in FIG. 4, the disc spring 17 provided on the bracket 16 fixed to the outer periphery of the upper bolster plate 7 bolts as the bracket 16 fixed integrally with the upper bolster plate 7 rises. As 17a rises integrally, drive nut 18 does not move and is further compressed than in the state shown in FIG. Most of the tightening force of the upper and lower tire molds 11 and 12 by the hydraulic cylinder 2 is transmitted to the frame 1 via the upper heating plate 9, the upper bolster plate 7, the struts 15, and the jamming plates 14. Bracket 16, although some are small,
It is transmitted to the lifting threaded rod 5 via the disc spring 17 and the drive nut 18. The tightening force transmitted to the lifting threaded rod 5 is determined by the amount of compression of the spring and the spring constant of the disc spring 17 from the state of the disc spring 17 shown in FIG. 2 (almost the free length of the spring) to the state shown in FIG. 4. It is equivalent to the product of In other words, it is sufficient to give the lifting screw rod 5 a strength that can withstand this force.

In this embodiment, a highly reliable and safe high-precision vulcanizing machine can be realized by employing hydraulic pressurization and a screw lifting method, and by incorporating a disc spring 17 into the drive nut 18, the upper and lower tire molds 11, 12 can be prevented from having an adverse effect on the drive nut 18 and the lifting screw rod 5.

Next, a second embodiment shown in FIGS. 6 to 8 will be described.

This example is a connected ring type vulcanizer, forming a so-called dual cavity vulcanization press having left and right vulcanization zones, and this vulcanizer is constructed as follows. Lower beam 32 provided below each vulcanization zone, pressure cylinder 3 provided above the lower beam 32
3. Upper and lower tire molds 11 via the lower hot plate 10,
A lower mold support plate (lower bolster plate) 40 that transmits the pressurizing force of the pressurizing cylinder 33 to )3
5. Body plates 38 and 39 are fixed to the upper bolster plate 35 and the lower beam 32, respectively, and flanges 37 and 36 are provided at the tips of each. In particular, the flange 37 and the connecting ring 41 that engage with the flange 37 form a so-called breech lock.
Both the connecting rings 41 are cut at equal pitches as shown in FIG.
The pitch rotation releases the locked state of the flange 37 and the connecting ring 41 so that the upper bolster plate 35 does not become an obstacle to upward movement.

A device for moving the upper tire mold 11 upward after completion of vulcanization to open the vulcanizer will be described with reference to FIG. 7. A lifting threaded rod 43 rotatably supported by the support frame 41 is installed through a hole provided in the center of the lifting beam 34 that connects the upper bolster plates 35 of the left and right cavities. A drive nut 45 is screwed into the lifting threaded rod 43. The flange 47 is connected to the lifting beam 34 by bolts 49.
Fixed. Drive nut 45 and lifting beam 34
A disc spring 46 is installed between the two so as to separate them. The spring guide tube 48 is the lifting threaded rod 34
It is fixed to the lifting beam 34 so as to cover the lifting threaded rod 34 when the disc spring 46 is compressed.
This is provided to avoid interference with the Figure 7 shows a beam 34 that lifts and lowers due to pressure during tire vulcanization.
The drive nut 45 and the flange 47 are shown in a state in which the countersunk nut 46 is compressed as it is lifted upwards.
However, when the lifting beam 34 is normally raised and lowered, the driving nut 45 and the flange 47 engage, and as the driving nut 45 is raised and lowered by the rotation of the lifting threaded rod 43, the lifting beam 34 is raised and lowered together with the flange 47. do. Furthermore, as a device for opening the vulcanizer, as shown in FIG.
A guide rod 44 vertically erected from the foundation and a support frame 41 for supporting the lifting screw rod 43 at the upper end are installed on the support frame 41 and connected to the lifting screw rod 43 to drive the rotation. It is composed of an assembly 50 of an electric motor and a speed reducer for the purpose.

The main aspects of the connected ring type vulcanizer are the same as those of the frame type vulcanizer of the first embodiment, and only the differences will be explained here. When the upper tire mold 11 approaches the lower tire mold 12 and pressurizing force is applied by the pressurizing cylinder 33, the dimension in which the upper bolster plate 35 lifts upward is determined by the distance between the connecting ring 41 and the flange 3.
The disc spring shown in Fig. 7 is the total dimension of the gap between 6 and 37, the amount of extension of the body plates 38 and 39 stretched by the pressure, the amount of deflection of the upper bolster plate 35, etc. 46 is given a sufficient stroke to absorb this dimension, and after the unvulcanized tire is brought into the center of the tire lower mold 12, the tire upper mold 11 is moved downward while building steam pressure in the bladder. When pushing down, it is necessary to provide a specification that has enough strength to prevent the upward force of the tire upper mold 11 generated from the unvulcanized tire from compressing the disk spring 46 significantly or causing it to stick tightly together. It is.

The effects of the second embodiment are that, as in the case of the first embodiment, a highly reliable and safe high-precision vulcanizer can be realized by employing hydraulic pressurization and a screw lifting method, and the drive nut 45 By incorporating the disc spring 46 into the tire, it is possible to prevent the negative influence of the pressing force of the upper and lower tire molds 11 and 12 on the drive nut 45 and the lifting threaded rod 43.

Although the present invention has been described above based on the first and second embodiments, the present invention is not limited to these two embodiments, and in the two embodiments, the pressure cylinder is placed at the bottom of the lower mold. I am explaining what I did, but
For example, it is possible to install a pressurizing cylinder on the upper beam and pressurize the upper mold through the support.Also, depending on the required force and stroke, the disc spring can be used with other types such as coil springs. It is also possible to replace it with an elastic body, and if a type with high power transmission efficiency such as a so-called ball screw type is used for the lifting threaded rod, the motor should be of an open-excitation type to prevent the upper mold from falling due to its own weight. It is also possible to adopt a brake. Further, in the first embodiment, a so-called single-cavity vulcanizer with one mold is described, but a multi-cavity vulcanizer as in the second embodiment is also possible in the same manner as in the first embodiment.

[Brief explanation of drawings]

1 and 6 are front views of the first and second embodiments, respectively, FIG. 2 is an enlarged sectional view of a portion of FIG. 1, and FIGS. 3 to 5 are explanations of the operation of the first embodiment. Figure, 7th
The figure is an enlarged sectional view of a portion in FIG. 6, and FIG. 8 is a view taken from the direction of the arrow in FIG. 1... Frame, 2, 33... Pressure cylinder, 3
...Electric motor, 4...Reducer, 5, 43...Elevating threaded rod, 6...Bevel gear, 7,35...Upper bolster plate, 8,40...Lower bolster plate, 9...Upper hot plate, 10...Lower hot plate, 11...Tire upper mold, 12...
Lower tire mold, 13...hole, 14...shama plate, 15...
Post, 16...Bracket, 17, 46...Countersunk screw,
18, 45... Drive nut, 19... Beam nut,
20... Beam screw, 21... Drive device, 22
...middle screw, 32...lower beam, 38, 39...body plate, 3
6, 37, 47...Flange, 34...Elevating beam, 41
...Connection ring, 44...Guide rod, 48...Guide tube, 49...
Bolt, 50...Assembled product.

Claims (1)

[Claims] 1. In a tire vulcanizer equipped with an upper mold part that moves up and down with the upper bolster plate, a lower mold part, and a hydraulic cylinder that presses the upper mold part and the lower mold part, a drive nut that engages in a vertically movable manner;
an elevating threaded rod that extends vertically and is threaded into the drive nut rotatably supported by the frame; a drive device that rotates the threaded rod; and a direction that is interposed between the drive nut and the upper bolster plate and that separates the two. A tire vulcanizer characterized by being equipped with a spring that acts on the tire.