JPS6229204B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention operates a piston rod, which serves as the central mechanism of a tire vulcanizer and a central member of a series of operations from green tire charging to vulcanization molding, by mechanical lifting means. It's about what you want to do.

As is well known, the central mechanism of a tire vulcanizer includes a cylinder tube located at the center of the upper and lower molds that can be raised and lowered, a piston rod installed inside the tube that can be raised and lowered, and a clamp such as a lower clamp ring that is held at the upper end of the tube. The main members are a clamp member such as the clamp ring held at the upper end of the piston rod, and a shaping mold such as a bladder that is held at the top and bottom by the upper and lower clamp members, and is used for shaping steam, hot water, etc. It is equipped with means for supplying an internal pressure medium and further a hydraulic medium such as water for raising and lowering the piston rod, and is capable of charging a green tire, setting a bladder or the like into a mold accompanied by a shaping type tire inscription, The internal pressure for shaping is supplied and the vulcanization molding operation is performed under pressure by the mold. During this series of operations, the piston rod is raised and lowered to each stacking height while holding the shaping mold, and is an important central member. It is well known that the drive mechanism for this lifting and lowering movement is to move the piston at the lower end of the piston rod up and down by supplying and discharging water or the like using hydraulic pressure using a cylinder tube. Therefore, the mechanism requires a cylinder, a piston structure, and an on-axis seal structure between the piston rod and the cylinder tube, which inevitably complicates the structure and requires sufficient consideration of the sealing effect. In addition, it is necessary to deal with phenomena such as thermal distortion that occurs in various parts of the mechanism due to temperature differences between the liquid pressure caused by water for raising and lowering the piston rod, and the internal pressure caused by steam, hot water, etc. used as the internal pressure for shaping. Coupled with the variety of structures, there are some problems in that not only the structure around the cylinder tube becomes complicated, but also the control of detection, measurement, stopping, etc. of the required position of the piston rod at each stacking height becomes complicated. There is a tendency for it to derive.

The present invention enables a simpler structure of such a central mechanism, simplifies control operations, and simplifies maintenance management.The present invention is characterized by the ability to move up and down centered on the lower mold. A cylinder tube, which is arranged in A piston rod that is internally movable up and down over a lower tube integral with the piston in the buffer cylinder, and has an upper clamp member at its upper end that supports the upper part of the shaping mold such as a bladder, and supplies internal pressure for shaping to the inside of the shaping mold. A rotary member installed in the lower tube is engaged with the piston rod so that the rod can be vertically raised and lowered, and is equipped with a brake so that the raised and lowered position of the piston rod can be detected as a drive source for the rotary member. The purpose is to use a drive motor such as a motor.

The present invention will be described in detail below based on the illustrated embodiments. FIGS. 1 to 8 are longitudinal sectional front views of the central mechanism embodiment according to the present invention at each operating position in the order of operation, and FIG. , FIG. 10 shows a modified embodiment of the lifting rack and pinion mechanism.
Figures 1 and 12 show the central mechanism 1 using a conventional hydraulic medium.
Each longitudinal sectional front view of an example is shown, but prior to the present invention, the conventional mechanism shown in FIGS. 11 and 12 will be explained. That is, in both figures, 1 is a cylinder tube that is located at the center of the mold of the tire vulcanizer and is movable up and down, 2 is a piston rod that is installed inside the tube 1 so that it can be raised and lowered, and 3 is a plater as a shaping mold. The lower part of the bladder 3 is clamped and supported by a lower clamp ring 4 attached to the upper end of the cylinder tube 1, and the upper part of the bladder 3 is supported by an upper clamp ring 5 attached to the upper end of the piston rod 2. Ru. 6 is a lower mold that is fixedly arranged on the base frame, 7 is an upper mold that is joined to this lower mold so that it can be opened and closed, and these molds 6 and 7 are equipped with heating plates and other necessary structures. However, since these are all well known, their explanation will be omitted. The cylinder tube 1 in the central mechanism has one end engaged with a lifting lever 8 at its lower end so that the entire cylinder tube 1 can be raised and lowered, and a piston 10 formed at the lower end of a piston rod 2 via a spacer 9. Correspondingly, a pipe 11 is connected to the piston 1 at the bottom end of the tube.
By providing a supply port 12 for the lifting liquid medium inserted into the piston rod 2 through the piston rod 2 and a supply port 13 opening into the tube, when the piston rod 2 is raised, the supply port By supplying a liquid medium such as water from 13, the piston 10
When the spacer 9 rod 2 is raised and the piston rod 2 is lowered, by supplying liquid medium from the supply port 12, the liquid medium is discharged from the outlet 14 of the piston 10 to the upper surface of the piston 10 through the pipe 9. Then, the rod 2 is lowered. In addition, a cylinder guide 15 for guiding the cylinder tube 1 up and down is fitted onto the upper end of the cylinder tube 1 to which the lower clamp ring 4 is attached, as shown in the figure.
A clamp ring hub 16 is provided at the top of the
This hub 16 is equipped with a heat medium injection port 17 for shaping internal pressure (steam, hot water, etc.) together with a supply pipe 18, so that the heat medium is injected into the bladder 3 near its equatorial plane. Inside the upper end of 1 is another buffer piston 1 which receives the liquid medium from the outlet 14 of the piston 10 and moves up and down.
9. A sleeve 20 is installed which is supported on the opposite surface of the piston 19 to the liquid medium receiving surface and is slidable and engages with the upper clamp ring 5. Since the above is already publicly known, only the outline and illustration of the main structure will be given. In such a conventional central mechanism, Fig. 11 shows the state in which the green tire T is loaded, and Fig. 12 shows the state in which the green tire T is inserted. The tire T is loaded so as to sit on the lower clamp ring 4 located on the lower mold 6 of the opened mold by a loader member 21 such as a vertical loader. Next, the bladder 3 is attached to the inner surface of the loaded tire T, and a shaving process is performed in which the bladder 3 is brought into close contact with the inner surface of the tire T by jetting a vapor pressure of, for example, about 2 to 3 kg/cm ² from the heat medium injection port 17. Upon completion of shaping, the loader member 21 is retracted, and the lower clamp ring 4
The green tire T shaped into the shape of the lower mold through the bladder 3 is covered with the upper mold 7 for clamping and heat medium injection, and further by heating and pressurizing the upper and lower molds 6 and 7 using the heating plates 22 and 23, etc. The vulcanization molding process shown in FIG. 12, the opening and retraction of the upper mold 7 after vulcanization, and the vulcanized tire T with the bladder 3 inside the lower mold 6
The lower clamp ring 4 is detached by raising the cylinder tube 1, and then the lower clamp ring 4 is lowered and the upper clamp ring 5 is raised, causing the bladder 3 to deform and stretch and detach from the tire T, and the bladder 3 is released. A series of vulcanization molding operations, such as unloading of the tire T that has now become a tire, is automatically performed.At this time, the cylinder tube 1 is raised and lowered, and the piston rod 2 is raised and lowered together or independently. It plays an important role as a central member in the sulfur molding operation, and conventionally, as is clear from the illustrated example, a hydraulic medium such as water is used as the driving source, and some of the problems explained at the beginning are caused by the hydraulic medium This is unavoidable because it uses

The present invention solves this problem by using a central mechanism as illustrated in FIGS. 1 to 8. In FIG. 1, 31 is the cylinder tube of the present invention; The lower end is disposed at the center of the vulcanizer mold so that it can be raised and lowered by an elevator lever 8 or the like as in the conventional example.
This cylinder tube 31 is connected to the lifting lever 8.
A buffer cylinder 41 that can be freely supplied and discharged using fluid pressure such as air as a driving source (the air supply and discharge pipe is omitted) is formed on the upper part of the engaging portion 40, and the flange of the cylinder 41 is The bracket 41a and the flange or bracket 31a protruding from the middle of the tube 31 are connected and integrated by a guide bar 42 provided parallel to the tube 31, and can be freely raised and lowered by the guide bar 42 via a slide guide 43a. A lower tube 43 concentric with the tube 31 is slidably inserted into the buffer cylinder 41 via a piston 44, and the piston 44 is held by fluid pressure and can be raised and lowered. The tube 31 is slidably held on the cylinder guide 15 installed using the base frame 32 supporting the lower mold 6, and the lower clamp ring hub 16 is integrally attached to the upper end of the tube 31 in the illustrated example. and form this hub 1
A lower clamp ring 4 is attached to the lower clamp ring 6, and the ring 4 is used as a shaping type to hold the lower end of the bladder 3 in the illustrated example as in the conventional example. The clamp ring hub 16 also has a heat medium injection port 17 for shaping internal pressure of steam, hot water, etc.
Although not shown, a heat medium discharge port is provided, and these can be appropriately designed using the entire circumference of the hub 16. A piston rod 33 is housed inside the cylinder tube 31 so as to be movable up and down, and an upper clamp ring 5 is attached to the upper end of the rod 33 to hold the upper end of the bladder 3 as in the conventional example. A rack 34 is formed on the circumferential side as shown, and a pinion 35 that meshes with the rack 34 is rotatably housed in a casing 36 formed or attached using the circumferential side of the lower tube 43 of the cylinder tube 31. The rotation of the pinion 35 is directly or indirectly driven by a drive motor 37 with a brake. It shows. Here, in FIG. 1, the bladder 3, upper and lower clamp rings 4, 5, clamp ring hub 16 cylinder guide 15, etc.
Items with the same symbols as the conventional example shown in Figures 1 and 12 are:
Although it is shown that there is no problem with the same components as in the conventional example (the same applies hereinafter), of course, in the case of a component structure other than the illustrated example, such as bladder 3, the same effect can be achieved with a bladder of a type other than the illustrated example. As shown in the figure, the upper and lower clamp rings 4 and 5 can also be applied to models other than bead rings and clamp rings.
Individual member structures other than those shown in the illustrations have the same effect. Also, in Fig. 1, 6 is the lower mold, 22
21 indicates a loader member such as a vertical loader, and T indicates a green tire.
These are also the same as the examples shown in FIGS. 11 and 12, and in the following FIGS. 2 to 8, 7 is the upper mold;
23 indicates the heating plate.

The central mechanism according to the present invention is as described above, and the vulcanization molding operation for the green tire T is also performed in the same manner as the conventional method shown in FIGS. 11 and 12, but this will be briefly described as follows.

That is, FIG. 1 shows the green tire T in a loading state, with the piston rod 33 being raised to the illustrated position by the rack and pinion mechanisms 34 and 35, and the bladder 3 being in an extended state by the upper and lower clamp rings 4 and 5. , the upper and lower molds 6 and 7 are in an open state, and the lower tube 43 in the cylinder tube 31 is held in the raised position by fluid pressure supplied to the lower surface of the piston 44 in the buffer cylinder 41. . Using a loader member 21 such as a vertical loader, the green tire T is loaded onto the lower clamp ring 4 positioned on the lower mold 6 and placed on the mold 6, and then, as shown in the second figure, a rack and pinion mechanism is installed. 34,
35 lowers the piston rod 33, and through the accompanying lowering of the upper clamp ring 5, the bladder 3
is inscribed in the inner surface of the tire T while being curved and deformed. FIG. 3 shows that by lowering the piston rod 35 to a predetermined position, the bladder 3 is brought into contact with the inner surface via the clamp rings 4 and 5 as shown in the figure, and the heat medium injection port 17 in the clamp ring hub 16 is inserted into the bladder 3 as appropriate. Shaping is carried out by injecting high pressure hot steam to completely attach the bladder 3 to the inner surface of the tire, and at this time the raised position of the lower tube 43 remains unchanged. When the shaping is completed, the loader member 21 is retracted, the upper mold 7 is placed over the lower mold 6, and the molds are clamped, and then the heating medium is injected, the heating plates 22 of the molds 6, 7, Tire T through heating and pressurization with 23 etc.
Vulcanization molding will be performed. At this time, by setting the brake of the brake motor 37 to the OFF position prior to mold clamping, the pressure shock during mold clamping and crimping is supported by the buffer cylinder 41 supporting the fluid pressure via the piston 44 of the lower tube 43. is suitably absorbed and relaxed to eliminate the adverse effects of impact on various parts including the rack and pinion mechanisms 34 and 35, and the lower tube 43 is in the lowered position as shown in the figure. FIG. 5 shows a state in which the upper mold 7 is raised and opened after vulcanization is completed. After the upper mold is retracted, the cylinder tube 31 is raised by the lifting lever 8 as shown in FIG. 6, and vulcanization is completed. The tire T is peeled off from the lower mold 6, and the cylinder 44 of this tube 31
When the flanges or brackets 41a, 31a and the guide bar 42 are raised together, fluid pressure is supplied into the cylinder 41 to raise the lower tube 43 as shown in the figure, and the position of the pinion 35 is raised from the lowered position shown in FIG. I'll keep it. Next, as shown in FIG. 7, after the vulcanized tire is peeled off and raised, the piston rod 33
is raised by the rack and pinion mechanism 34, 35, and the inner surface of the tire T is raised by raising the upper clamp ring 5 and lowering the lower clamp ring 4 through lowering of the cylinder tube 31 by the lifting device 8. The bladder 3 that is in close contact with the tire T is peeled off like a drawer and released. In the same figure, 38 indicates an unloading member (unloader) or a temporary receiving member that supports both sides of the bottom surface of the tire T. In this way, the tire T is taken out of the vulcanizer by the appropriate unloading member 38 and the like, while the piston rod 33 is raised to the highest position and the cylinder tube 31 is lowered to the lowest position, so that the bladder 3 is completely detached and expanded. The process repeats from the completed state shown in the figure to the state shown in FIG.

In the embodiment shown in FIGS. 1 to 8, a rack 34 is formed on the circumferential side of the piston rod 33, and a pinion 35 is arranged on the cylinder tube 31 side. Similarly, the pinion 35 may be provided anywhere on the cylinder tube 31 or the piston rod 33, and its position does not have to be on the lower tube 43 side. As a modified example of these, the ninth,
An example is shown in Figure 10. That is, FIG. 9 shows a pair of racks 34a, 34 on the symmetrical peripheral side of the piston rod 33.
b, and correspondingly cylinder tube 3
A pair of pinions 35a and 35b are provided on the casing 36 side of the lower tube 43 of 1, and both racks 34
a and 34b, and both pinions 35a and 35b are synchronously driven by a single or dedicated drive motor 37 to move the piston rod 33 up and down. can get. If you don't mind the hassle of operation, it is also possible to use one exclusively for ascending and the other exclusively for descending. Also, the example shown in Figure 10 is
A pinion 35 is attached to the piston rod 33 side,
As shown in the example, an integrated or separate rack rod 39 is provided on the cylinder tube 31 or lower tube 43 side, and a rack 35 is formed on this.
The design of the rack and pinion mechanisms 34, 35 is free.

In this case, the reason why a motor with a brake is used as the drive motor 37 in the present invention is to automatically control the rise and fall of the piston rod 33 according to each stroke and its accurate stop at a predetermined position. The stacking height can be detected by digital position detection means, for example, by extracting a pulse wave for transmission from the motor 37 and using detection members controlled by electric signals such as a proximity switch, a limit switch, a phototube, etc. This is because it is easy to centrally and automatically control the piston rod 33 in combination with a computer and interlocking means, and thereby the series of elevations and descents of the piston rod 33 can be managed without error.

The central mechanism according to the present invention can have excellent features in the following points. That is, by controlling the lifting and lowering of the piston rod 33 using mechanical lifting means, such as rack and pinion mechanisms 34 and 35, the necessary mechanisms around the cylinder tube are extremely simplified compared to the conventional piston rod lifting means using hydraulic cylinders. The installation of the cylinder-piston mechanism in a cylinder tube with a limited diameter makes it difficult to achieve a perfect sealing effect, and the required structure is
This becomes extremely complicated due to the centralized arrangement of piping equipment and seal structures. Moreover, the use of internal pressure heating medium for shaping and the use of liquid medium for lifting tend to cause phenomena such as thermal distortion, but according to the present invention, there are no such problems at all, and the operation function is robust and correct. This simplifies the structure and reduces the number of parts required for overall manufacturing and assembly, which is extremely advantageous. Moreover, the motor drive allows position control of each stacking height to be detected digitally, providing accurate control results, making it easy to perform fully automatic work, and significantly simplifying maintenance management. At the same time, the simplification of the structure of the parts around the cylinder tube creates ample dimensional margin in terms of robust thickness and thickness for each member, making it possible to provide a central mechanism with great durability and less chance of failure. .

Furthermore, in the present invention, when using the mechanical means of rack and pinion mechanisms 34 and 35, which is one of such mechanical elevating means, a mechanism is provided on the cylinder tube 31 side to absorb and relieve the shock during mold clamping. As a buffer means, a buffer cylinder 41 is added as shown in the figure, so this part safely absorbs and alleviates the considerable impact that occurs when the mold is clamped, maintains smooth movement function, and protects the joints and interlocking parts. This eliminates the negative effects of anticipated shocks and provides significant benefits in improving safety.

[Brief explanation of the drawing]

1 to 8 are longitudinal sectional front views showing the operating state positions of the embodiment of the present invention in the order of operation;
FIG. 10 is an explanatory diagram of an embodiment of the rack and pinion mechanism. FIGS. 11 and 12 are vertical sectional front views showing an example of the conventional central mechanism during tire loading and vulcanization molding. 31... Cylinder tube, 33... Piston rod, 34... Rack, 35... Pinion (rotating member), 3... Bladder, 4, 5... Upper and lower clamp rings, 6, 7... Upper and lower molds, 8... Elevating lever, 16... Clamp ring hub, 17...
Heat medium injection port, 18...heat medium supply pipe, 41...buffer cylinder, 43...lower tube, 44...piston, T...tire.

Claims (1)

[Claims] 1. A cylinder tube which is disposed so as to be movable up and down at the center of the lower mold, and which has a lower clamp member at its upper end that supports the lower part of the shaping mold, such as a bladder, and a cylinder for cushioning the mold clamping shock at the lower part; and a piston rod which is internally movable up and down over the lower tube which is concentric with the tube and integral with the piston of the buffer cylinder, and which has an upper clamp member at its upper end that supports the upper part of the shaping mold such as a bladder; A rotary member installed in the lower tube is engaged with the piston rod so that the rod can be vertically raised and lowered, and serves as a drive source for the rotary member to detect the raising and lowering position of the piston rod. The central mechanism of a tire vulcanizer, characterized in that it uses a drive motor, such as a motor with a brake, as possible.