JPH065128Y2 - Central mechanism of tire vulcanizer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to improvement of a central mechanism used in a tire vulcanizer.

(Prior Art) As is well known, in a tire vulcanizer, when a green tire is loaded between a fixed lower mold and a movable upper mold to perform vulcanization molding, the tire is positioned at the center of the fixed lower mold. A central mechanism is provided on the vulcanizer frame side, and an elastic molded body that uses a expandable and contractible deformable rubber bag belonging to the mechanism is attached to the inner surface of the tire, and a heat pressure medium such as steam is supplied to the inside. The vulcanization molding of the green tire can be obtained by using the inner pressure of the tire as an inner pressure opposed to the outer pressure applied to the mold side together with the molding of the inner surface shape of the tire. One example of the conventional general central mechanism is shown in FIGS. 3 and 4. Explain. Fig. 3 shows the mold opening, and Fig. 4 shows the mold closing, but it is fixed on the lower platen 3 (built-in heat source) installed on the base frame 2 of the vulcanizer via the heat insulating layer 4. The mold 5 is attached to the mounting plate 8 on the side of the slide or other movable member (not shown).
A movable upper mold 9 is mounted on an upper platen 6 (having a built-in heating source) installed via a heat insulating layer 7, and a central mechanism 10 is installed at the center of the lower mold 5. The mechanism 10 includes a guide cylinder 13 fixed to the base frame 2 side, and a fluid pressure cylinder 14 for raising and lowering supported by a knockout lever 23 so as to be able to move up and down, and is attached to an upper end of a hollow rod 17 in a piston 15 of the cylinder 14. The upper ring 18 holds the upper end of the elastic molded body 11 which can be expanded and contracted by a rubber bag or the like, and the lower ring 22 which holds the lower end of the elastic molded body 11 at the upper end of the cylinder 14 and the ring 22. By fixing the hub 27 to the bottom surface of the fluid pressure cylinder 14, the pressurized fluid supplied through the port 16 provided in the lower portion of the fluid pressure cylinder 14 is supplied to or discharged from the lower surface of the piston 15 by a pressurized fluid or oil. Port 19
More through the pipe 20 inserted into the hollow rod 17 through the piston 15 through the supply and discharge of the pressurized fluid to the upper surface of the piston 15, the piston 15 and its hollow rod 17 are raised and lowered,
Due to the accompanying upper ring 18, the elastic molded body 11 is moved to the lower ring.
The elastic molded body 11 is deformed with the 22 side as a fulcrum, and a heat and pressure medium such as hateam is formed through a through hole 28 provided on the hub 27 side from the supply / discharge pipe 12.
The inner surface shape of the tire T is shaped by contacting and adhering to the inner surface of the green tire T loaded and set in the fixed lower mold 5 by the loader 1 and the like, and as shown in FIG. When the two molds 9 and 5 are closed, they act as internal pressures, whereby the green tire T is vulcanized and molded by heating through the platens 3 and 6 of both molds 9 and 5 and under clamping pressure.

Further on the piston 15, a spacer 24 for restricting the lowering position of the upper ring 18 in response to the change in tire size,
The hollow rod 17 is exchangeably fitted to the hollow rod 17 so that the size can be changed, and the floating piston 2 is mounted on the hollow rod 17 above the spacer 24.
5. The stopper 21 supported by the piston 25 is slidably fitted over the hub 27. Therefore, according to this central mechanism, as shown in FIG. 3, after the movable upper die 9 is retracted by opening, the piston 15 is lifted to avoid the elastic molded body 11 in the upright posture as shown by the chain line, and to load the loader. The green tire T is carried in and set on the fixed lower mold 5 by 1, and the piston 15 is lowered to deform the elastic molded body 11 and to supply the heat-pressurized medium into the molded body 11. 11 is expanded and pressure-contacted along the inner surface of the tire with the lower ring 22 side as a fulcrum to perform shaping, and the descending upper ring 18 is supplied with pressurized fluid to the lower surface thereof as the piston 15 descends first. The shaping process ends at a position where it comes into contact with the stopper 21 supported by the floating piston 25 that stops at a predetermined position, and then the movable upper mold 9 is moved to the fixed lower mold 5 as shown in FIG. The mold is closed and closed, the pressure of the heat and pressure medium in the molded body 11 pressed against the inner surface of the tire, the heating of both molds 9 and 5,
The tire T is vulcanized and molded under pressure. When the vulcanization molding is completed, the upper mold 9 is retracted and opened, and then the entire central mechanism 10 is lifted by the knockout lever 23 to lift and separate the tire T from the lower mold 5 side, and the piston 15 is lifted at the lifted position. The elastic molded body 11 is pulled out from the inner surface of the tire T by being raised to contract in a straight tube shape, and the tire T is supported by the unloader, and the elastic molded body 11 is evaded and the tire T is taken out of the machine.

(Problems to be Solved by the Invention) The above-described central mechanism 10 has the following problems. That is, although the lifting cylinder 14 is a single cylinder, it is disadvantageous in that its internal structure is complicated. Piston 15 for raising and lowering the upper ring 18, rod
In addition to 17, in order to lower and position the upper ring 18 according to the change in tire size, a floating piston 25, a positioning structure with a stopper 21 integrated therewith, and a spacer 24 are required. Also for pressurized fluid supply / discharge structure, ports 16, 19, supply / discharge pipe 20, piston
Since the hollow structure of the rods 17 of 15 is required, it is impossible to adopt a general fluid pressure cylinder, and maintenance and operation thereof are complicated. Even when the seal structure is applied, the double structure of the rod 17 and the stopper 21 results in a partial and insufficient seal in the installation space as shown by the seals 26 and 26a as shown in the figure. Since the main body of the cylinder 14 itself comes too close to the heating platen 3 side, the high temperature environment is likely to cause adverse effects,
It is inevitable to increase the size of the entire mechanism such as a drive member such as a knockout lever 23 for raising and lowering the central mechanism 10 as a whole, and the positioning adjustment of the upper ring 18 described above is also insufficient in accuracy. .

(Means for Solving the Problems) The present invention has taken the following means in order to solve the above problems.

That is, the feature of the present invention is that the lower fixed mold is attached to the upper surface side of the base frame of the tire vulcanizer, and the elastic molded body is arranged at a position corresponding to the inner surface side of the green tire set in the mold. An upper ring that supports the upper end of the elastic molded body and a lower ring that supports the lower end of the elastic molded body are arranged in the center of the mold, and a plurality of guide rods are provided downward from the lower ring. The guide rod is vertically installed, and a lower end portion of the guide rod is fixed to a connecting base, the connecting base is fixed to an upper end portion of a first piston rod arranged coaxially with the mold center, and the first piston rod is First fixed on the bottom side of the base frame
A second cylinder is provided on the cylinder so as to be able to move up and down, a second cylinder is erected and fixed on the connecting base, and a second piston rod arranged coaxially with the mold center is provided on the second cylinder so as to be able to move up and down. The upper ring is fixed to the upper end of the second piston rod, and a linear sensor for detecting the distance between the second cylinder and the second piston rod is provided between the second cylinder and the second piston rod.

(Operation) According to the present invention, the upper ring and the lower ring are moved up and down by the vertical movement of the first and second piston rods. The distance between the upper and lower rings is adjusted by controlling the stroke of the second piston rod based on the detection result of the linear sensor.

(Embodiment) An embodiment of the central mechanism of the present invention will be described with reference to FIGS. 1 (1), (2) and FIG. In FIG. 1 (1) and FIG. 2, only the lower platen 32 is shown, but this is the fixed lower mold 5 and the movable upper mold 9 and other mold side structures described in FIGS. Since it is exactly the same as the above, its illustration is omitted and only the central mechanism is shown here. In addition, an elastic molded body such as a rubber bag which can be expanded and contracted in the central mechanism, an upper ring 37 for holding the upper end of the elastic molded body, and a lower ring 34 for holding the lower end of the molded body are also shown in FIGS. The elastic molded body 11, the upper ring 18, and the lower ring 22 which have been explained have basically the same structure and can be used.For example, in the lower ring 34, the bead ring and the clamp ring, the lower bead ring center position are the same as in the conventional case. In addition to having a hub etc., a through hole for a heat pressure medium such as steam is formed, and the upper ring 37 is composed of a bead ring and a clamp ring. Therefore, only the necessary parts will be shown or explained. The central mechanism according to the present invention is a bracket 33 for mounting the central mechanism on the lower surface of the vulcanizer base frame 30 to which the fixed lower mold is attached and at a position concentric with the center of the lower mold.
Is fixed, and the lifting cylinder 35 (hydraulic pressure or other hydraulic pressure) of the lower ring 34 is attached to the lower end of the bracket 33 so as to project downward, and the piston rod 36 is taken out into the bracket 33, and the upper end of the rod 36 is fixed. Further, a connecting base 37 'with one or more heat insulating layers 46 interposed is attached. A plurality of (two in the example shown) guide rods 39 are provided at symmetrical positions on the circumferential side of the connecting base 37 '.
Is erected parallel to the cylinder 35 and the rod 36, the guide rod 39 is of such a height that it reaches the lower platen 32 at the rearmost retracted position of the piston rod 36, and each upper end of the rod 36 is of the lower platen 32. A bead ring 51 side of a lower ring 34 having a hub 50 at the center is connected to a guide 47 attached to the center so as to be slidable via a bush 38. The hub 50 and the bead ring are connected to the lower ring 34 having a hub 50 at the center. The clamp ring 52 is assembled on the 51. Connection stand 3 mentioned above
An elevating cylinder 38 of an upper ring 37 is fixed to the center position of 7'in a concentric and serial manner with the elevating cylinder 35, and a piston rod 40 of the cylinder 38 has a relay stand 53 having one or more heat insulating layers 45. The hub 50 of the lower ring 34 and the center of the clamp ring 52 are slidably inserted through a bush 54 and a seal member 44 formed by a V-shaped packing, and a bead is attached to the upper end of the rod 40. Upper ring consisting of ring 55 and clamp ring 56, cap 57, set screw 58, etc.
37 is installed. Further, on the circumferential side of the lifting cylinder 38, in the embodiment, the main body side of the detection member 41 using a linear type potentiometer is attached to the cylinder 38 via a mounting hand 59 or the like.
A movable detector attached to the detection member 41 in parallel with
42 is a relay stand for the piston rod 40 of the cylinder 38
It is connected to 53 via the connecting portion 60, whereby the stroke amount of the piston rod 40 of the cylinder 38 is
It can be controlled freely by detecting the predetermined position of the detector 42 (the lowered position corresponding to the tire size of the upper ring 37), and in response to the size difference of each regular type, low type or radial type green tire, the upper ring
It is possible to appropriately change the lowering position of 37, and the structure of the spacer 24, the floating piston 25, the stopper 21, etc. in the prior art is not required. In addition to the linear type, a rotary type potentiometer can be used as the potentiometer, and in this case, between the potentiometer and the piston rod 40,
For example, a power means such as a rack or a pinion is intervened. In addition to potentiometer, for example, magnetic scale,
It is possible to use a detection member 41 such as a pulse generator, and if a potentiometer is used, it will be an absolute type, so even after recovery due to a trouble such as a power failure, for example, there is a convenience that its position can be immediately displayed without needing readjustment. The detection member 41 can be freely selected. Further, as shown in FIG. 2, a pipe 43 for supplying and discharging a heat pressure medium such as steam is connected to the lower ring 34 side at a position different from the guide rod 39, and the heat pressure medium is above the pipe 43. It is the same as the conventional one that the gas is supplied to and discharged from the elastic molded body through the through hole 61 formed on the ring 34 side.

According to the above technical means of the present invention, as shown in FIGS. 1 (1) (2) and 2, the vulcanizer base frame.
The lower ring is attached to the bracket 33 fixed to the side of the base frame 30 at the center (press center) position of the lower platen 32 for mounting the fixed lower mold, which is installed on the 30 through the heat insulating layer 31.
Install the lifting and lowering cylinder 35 of 34, and connect the upper ring 37 to the upper end of the piston rod 36 of the same cylinder 35 through the connecting base 37 '.
The lifting cylinder 38 is installed, the lower ring 34 is held on the upper end of the guide rod 39 which is erected on the connecting base 37 ', and the ring 37 is mounted on the upper end of the piston rod 40 of the lifting cylinder 38 of the upper ring 37. Hold it, in the lifting cylinder 38,
For example, a height detecting member 41 of the upper ring 37 is attached by a linear potentiometer or the like, and a movable detector of the detecting member 41 is attached.
By connecting 42 to the piston rod 40 of the same cylinder 38 and additionally providing a pipe 43 for supplying and discharging a heat and pressure medium such as steam on the side of the lower ring 34, the following action can be obtained.

That is, FIG. 1 (1) shows the piston rod 36 of the lifting cylinder 35.
Is in the lowest position, and the lower ring 34 is not shown in the drawing due to the guide rod 39 descending with the lower platen.
For shaping and vulcanization molding, an elastic molded body (not shown), which is in a fixed position corresponding to the fixed lower mold mounted on 32 and is supported by upper and lower rings 37 and 34 at both upper and lower ends thereof, is formed. For the attachment to the inner surface of the green tire, the lifting cylinder 35 is left in the illustrated position, and the lifting reciprocator 38 is independently driven to lower the piston rod 40, and after the vulcanization molding is completed. The withdrawal of the elastic molded body from the inner surface of the tire can be easily performed by raising the piston rod 40.
At this time, during the shaping and vulcanization molding, it is necessary to change the lowering stop position depending on the size of the target green tire. For this, the movement detection of the detection member 41 attached to the cylinder 38 side is detected. Since the child 42 is mounted so as to be able to accompany the piston rod 40, the required lowering position can be controlled extremely accurately by adjusting the stroke amount of the rod 40, and at the same time the proper position lowering according to each tire size is detected, By stopping the lifting cylinder 38 via the signal transmission, the lowering and stopping to the predetermined position can be surely obtained. Furthermore, when raising or lowering the entire central mechanism after vulcanization molding or lowering the original position after taking out the tire, the entire cylinder can be raised and lowered by driving the raising and lowering cylinder 35 and raising and lowering its piston rod 36. The lower ring is used to supply and discharge the heat and pressure medium.
The supply and discharge piping 43 on the 34 side can be used in the same manner as the conventional one, and the essential structure of the central mechanism can be remarkably simpler and more compact than the conventional one. Both of the lifting cylinders 35 and 38 need only be commercially available single or double acting cylinders, and the sealing structure required between the piston rod 40 supporting the upper ring 37 and the lower ring 34 is as shown in the figure. It is possible to install a seal part 44 by V packing on both sides, and both cylinders 35, 38 can be installed separately from the high heat environment of the lower platen 32 side, and the heat insulating layers 45, 46 are essential due to the simplification of the essential structure. Not only can it be installed at a sufficient location, but also the good heat dissipation of the guide rod 39, which is effective in moving both cylinders 35 and 38 away from the high temperature environment, can effectively prevent cylinder heating. And the height detection member 41 accurately detects the height of the upper ring 37.
Accurate stroke amount control corresponding to 40 tire sizes can be obtained, and high-precision shaping and vulcanization molding are possible.

(Effect of the Invention) According to the central mechanism of the present invention, by the expansion / contraction deformation of the elastic molded body, the lifting cylinder 38, the vertical ring 37, as the driving means for making contact with or detaching from the inner surface of the green tire,
The elevating cylinder 35 that simultaneously elevates and lowers 34 has a simple cylinder structure and does not require any special mechanism inside. Therefore, a commercially available hydraulic cylinder can be used as it is. It suffices to arrange the cylinders 38, 35 in a concentric series in the vertical direction. Besides, not only the addition of the guide rod 39 can significantly simplify the entire structure, but also the detection member.
By using 41, the positioning of the upper ring 37 and the corresponding operation associated with the tire size are simplified and the accuracy is further improved. Furthermore, the simplification of this essential structure makes it possible to move both cylinders 35 and 38 away from the high heat environment on the vulcanizer side, and the seal structure and heat insulation structure have sufficient space to achieve a more complete effect than before. The central structure is easy to control and maintain, and the durability of the cylinder is improved. Of course, it is cost-effective, and the central function is improved. This is a great advantage for providing a mechanism.

[Brief description of drawings]

1 (1) is a vertical sectional front view of an embodiment of the present invention, FIG. 1 (2) is a front view of a lifting cylinder, and FIG. 2 is a sectional view taken along the line II-II of FIG. 1 (1). FIG. 4 is a vertical sectional front view of a conventional central mechanism example. 33 …… Mounting bracket, 35 …… Lower ring lifting cylinder, 34 …… Lower ring, 37 …… Upper ring, 38 …… Upper ring lifting cylinder, 36,40 …… Piston rod, 39
...... Guide rod, 41 …… Detecting member, 42 …… Detector, 43
...... Heat pressure medium supply and discharge piping.

Claims (1)

[Scope of utility model registration request] 1. A lower fixing mold is attached to an upper surface side of a base frame (30) of a tire vulcanizer, and an elastic molded body is arranged at a position corresponding to an inner surface side of a green tire set in the mold, An upper ring (37) that supports the upper end of the elastic molded body and a lower ring (34) that supports the lower end of the elastic molded body are disposed in the center of the mold, and the lower ring (34) faces downward. A plurality of guide rods (39) are vertically installed, and the lower end of the guide rods (39) is fixed to a connecting table (37 '), and the connecting table (37') is arranged coaxially with the center of the mold. Is fixed to the upper end of the fixed first piston rod (36), and the first piston rod (36) is mounted on the first cylinder (35) fixed to the lower surface side of the base frame (30) so as to be able to move up and down. The second cylinder (38) is erected and fixed on the connecting table (37 '), and the second cylinder (38) is connected to the mold center. The second piston rod arranged in the axis (40) is provided vertically movably,
The upper ring (37) is attached to the upper end of the second piston rod (40).
Is fixed, and a linear sensor (41) for detecting a distance between the second cylinder (38) and the second piston rod (40) is provided between the second cylinder (38) and the second piston rod (40). mechanism.