JPH0124049B2 - - Google Patents

Description

Detailed Description of the Invention The present invention, as a tire vulcanizer, separates the opening/closing mechanism and the tightening mechanism of the upper and lower molds, employs a fluid pressure cylinder as the drive source for both mechanisms, and improves both mechanisms. This invention is intended to improve functionality and simplify the required structure and operation.

The most commonly used type of tire vulcanizer is one in which the upper and lower molds are opened, closed, and tightened using the same mechanical means; The upper mold is supported by the upper beam, and the upper mold is opened and closed relative to the lower mold by rotating and raising and lowering the upper beam using bull gears and side links provided on both sides of the vulcanizer base. At the same time, the bull gear is rotated by an electric motor through a worm reducer. In case the mold heights are different,
Between the upper beam and the upper mold attachment part, there is provided a mold storage height adjustment device by turning a screw. It is also known that in such mechanical tire vulcanizers, a twin type, in which two sets of upper and lower molds are usually arranged on the vulcanizer base, is often adopted.

A common drawback in such mechanical tire vulcanizers is that the vulcanizer base, to which the lower mold is fixed via the side links, and the upper beam, which supports the upper mold, are deflected. Because mold clamping force is generated, an imbalance occurs between the upper and lower molds supported by a common base and upper beam, where both ends of the base are tightened more strongly than the center of the base, which can damage the mold. In addition, due to the difference in thermal expansion between the upper and lower molds, the center of the upper and lower molds shifts, resulting in poor curing accuracy. Since a vertical adjustment means is used, eccentricity occurs due to the backlash in the screw, which causes the center of the upper and lower molds to shift, which also impairs vulcanization accuracy.An even bigger drawback is that opening/closing and tightening are performed by the same mechanism. Therefore, the vulcanizer base, upper beam, side link, bull gear, etc. all need to be large and heavy structures, which increases the size and weight of the machine and increases manufacturing costs. This is a point of invitation.

The present invention solves the above-mentioned drawbacks of the mechanical tire vulcanizer, uses a fluid pressure cylinder such as a hydraulic cylinder as a drive source, and improves the contents of the upper and lower opening/closing mechanism and tightening mechanism. Then,
It is designed to solve the problems with conventional hydraulic tire vulcanizers, and its features are: a lower mold fixed on the vulcanizer base;
The upper mold is vertically raised and lowered toward the lower mold to be opened and closed. As a tightening mechanism for both of the molds, piston rods which surround the outer periphery of the lower mold, are equally distributed on the vulcanizer base, and are provided with locking portions are provided so that the locking position can be varied up and down according to the height of the mold. a plurality of tightening fluid pressure cylinders, and a rotatable tightening lock that is attached to the outer periphery of the upper mold in correspondence with the tightening fluid pressure cylinders and that is freely engageable and detachable from the piston rod lock portion of the cylinders. It is located at the point where the axis is provided.

The present invention will be described in detail below based on the illustrated embodiments.The first section shows the entire vulcanizer as a twin-type embodiment in which two sets of upper and lower mold sets are installed side by side on the vulcanizer base.
Figures 3 to 3, and Figure 4 showing the structure of each main part.
In the figures to FIG. 5, guides 3, 3 are erected on both left and right sides of a common vulcanizer base 1, and a guide 27 is erected in the center,
Between these guides 3 and 27, there is a base 1, respectively.
A base heat insulating plate 29, a lower die mounting plate 28, a lower heat insulating plate 11, and a lower heat plate 10 are installed on the top, and a lower die 14 is installed on the lower heat plate 10. A lower dome 14a is also provided. An upper slide 5 is provided on the lower mold 14 so as to be vertically movable up and down via the guides 3 and 27, and an upper mold mounting plate 8, an upper heat insulation plate 12,
The upper hot plate 13 is installed one after another, and the upper mold 15 is installed on the upper hot plate 13. In the illustrated example, the upper mold 15
An upper dome 15a is also provided surrounding it. These lower mold 14 and upper mold 15 are similar to the upper and lower molds in a conventional tire vulcanizer, and although not shown in the center position of the lower mold 14, there is a bladder for shaping green tires and expansion/contraction deformation of the bladder. A central mechanism is provided for this purpose, and the supply structure for other thermopressure media (steam, etc.) provided in the central mechanism is also not shown.Also, the example in the figure shows an example of a twin-type vulcanizer. The present invention is applicable to both a single type vulcanizer and a multi-type vulcanizer having two or more sets of upper and lower molds.

In the present invention, as a driving source for vertically raising and lowering the upper slide 5 via the guides 3 and 27, a first
As illustrated in FIGS. 3 to 3, two lifting hydraulic cylinders 4, 4, such as hydraulic cylinders, are installed on the left and right outer sides of the upper slide 5 at two corresponding positions on the circumferential side of the upper die 15. The piston rods 4a, 4a of the cylinders 4, 4 are arranged,
By connecting via clevises 7, 7 to synchronizing legs 30, 30 provided downwardly protruding on both the left and right sides of the upper slide 5, the upper slide 5 can be raised and lowered.
Therefore, the upper mold 15 is opened and closed relative to the lower mold 14. At this time, the synchronization during the vertical movement of the two left and right hydraulic cylinders 4, 4 is performed by using the left and right synchronizing legs 30, 30 of the upper slide 5 mentioned above, and at least two surfaces of the left and right guides 3, 27, respectively. This is achieved by providing the slide guides 5a, 5a that engage and slide, and also allows the upper slide 5 and the upper mold 15 to move up and down stably without tilting. Note that a common upper connecting beam 6 is installed between the upper ends of each guide 3, 27.

In the present invention, the tightening mechanism for closing both the upper and lower molds 15, 14 is as shown in FIGS. 1 and 4 and 5.
As illustrated in the figure, tightening fluid pressure cylinders 2, such as four hydraulic cylinders, are arranged at each equally divided position surrounding the outer periphery of the lower die 14 on the lower side of the vulcanizer base 1. Then, the piston rod 17 of each cylinder 2 is made to pass through the base 1 and protrude above the lower hot plate 10 of the lower die 14 on the outside of the lower dome 14a, and a lock head 18 is attached to the upper end of the rod 17.
Further, the piston rod 17 is provided with a threaded portion 16 in the middle thereof, and the threaded portion 16 is provided in the middle of the piston rod 17.
A nut 23 with a sprocket, which is rotatably held in a nut locking notch 33 provided on the outer periphery of a lower mold mounting plate 28 that is integral with the base 1, is screwed onto the outer periphery of the nut 23. 23a is provided, and the gear motor 2 is connected to the sprocket 23a.
A roller chain 24 driven by a roller chain 5 is stretched and rotatable. At this time, so that the sprocket nuts 23 of each piston rod 17 in the four fluid pressure cylinders 2 can be driven in common.
The roller chain 24 is stretched between the sprockets 23a of the four nuts 23 so as to be freely movable. Furthermore, the sprocket-equipped nut 23 is locked in the notch of the nut locking notch 33 so that it can rotate but is restrained in the vertical direction, however, a space for deflection due to the tightening force is left open. There is. The piston rod 17 is provided with a detent key 3.
4, the piston rod 17 can be moved only in the vertical direction by the forward and reverse rotation of the nut 23 without being rotated via the threaded portion 16.

Corresponding to the tightening fluid pressure cylinder 2, four locking legs 9 are also provided on the outer periphery of the upper slide 5 holding the upper die 15 in a protruding shape using the upper dome 15a, etc. A lock shaft 32 is rotatably inserted and supported in each leg portion 9 via upper and lower bearing receiving portions 26, 19, etc.
A lock head 18 provided at the upper end of the piston rod 17 of the hydraulic cylinder 2 and a shaft 3 are provided at the lower end of the piston rod 17 of the hydraulic cylinder 2.
A lock tail 31 is provided which can be freely engaged and detached by rotating the lock shaft 3 by 90 degrees.
A pinion 20 is attached to the upper end of the upper slide 5, and a gear 21 driven by an air cylinder 22 installed at the upper part of the upper slide 5 meshes with the pinion 20. to 90
I'm trying to give a degree of rotation. At this time, each lock shaft 32 can be freely driven synchronously through each pinion 20 by the common gear 21, and the driving means can be freely designed.

Opening/closing and clamping of the upper and lower molds in the tire vulcanizer of the present invention are performed as follows.

In FIG. 1, as shown by the chain line, as the piston rod 4a in the lifting hydraulic cylinder 4 rises, the upper slide 5 rises to the open position through the guides 3 and 27, and the upper mold 1 accompanying this rises.
5 is also in an open position, and under such an open position, a green tire is loaded onto the lower mold 14, and then the bladder on the lower mold 14 side is loaded along the inner surface of the tire, and the thermopressure medium is injected into the bladder. It performs tire shaping as well as supply, and these operations are exactly the same as in conventional vulcanizers. When the preshaping is completed, the upper mold 15 starts to close to the lower mold 14, but this involves driving the left and right cylinders 4, 4 by lowering the piston rod 4a of the hydraulic cylinder 4.
Slide guide 5 in tuning legs 30, 30
Through the guidance of a, 5a and the guides 3, 27, the upper mold 15 of the upper slide 5 is lowered to a horizontal position and closed to the lower mold 14. The lock heads 18 of the piston rods 17 of the fluid pressure cylinders 2 arranged on the four sides of the lower mold 14 are inserted into the lock legs 9 formed on the four sides of the upper slide 5 that descends when the mold is completely closed. Since it engages with the lock tail 31 of the lock shaft 32 of the leg 9, the air cylinder 22 is then driven to shift the gear 2.
1 to rotate each pinion 20 through the lock shaft 3
2 is rotated 90 degrees and the lock head 18 is locked by the lock tail 31. By driving the tightening cylinder 2 and lowering the piston rod 17, the lock head 18 and lock tail 31 are
Through the integration of the leg portion 9 of the lock shaft 32, the tightening force is transmitted to the upper slide 5, and the upper and lower molds 15, 14 are tightened between the upper slide 5 and the base 1. At this time, the tightening stroke of the fluid pressure cylinder 2 is the sum of the adjustment allowance for the mold housing height, the deflection of the tightening mechanism, and the gap between the lock head 18 and the lock tail 32, and a short stroke is sufficient. In this way, vulcanization molding is performed after the mold is closed and tightened, and after the vulcanization molding is completed, the clamping in the fluid pressure cylinder 2 is released and the lock shaft 32 is rotated in the opposite direction to separate the lock tail 31 and lock head 18. The lock is released to allow the head 18 to pass through the tail 31, and the mold is opened by lifting the upper slide 5 by driving the lifting hydraulic cylinder 4.

The mold used changes depending on the tire size, and if the mold height changes, the lowering position of the upper slide 5 for closing changes, so the lock head 18 and the lock tail 3
It is necessary to adjust the lock position according to 1. For this adjustment, the gear motor 25 is driven and each sprocketed nut 23 is rotated via the roller chain 24, so that the piston rod 17 is fixed to the threaded portion 16 by the rotation of the nut 23 in the nut locking notch 33. By moving vertically via the detent key 34, the engagement position with the lock tail 31 of the lock shaft 32 in the lock leg 9 of the lock head 18 of the piston rod 17 at the time of closing can be adjusted appropriately depending on the mold height. Changes are adjustable. In addition, if the tightening fluid pressure cylinder 2 breaks down due to a power outage, oil pressure leak, etc., there is a risk that the upper mold 15 side will rise and open due to internal pressure. Depending on the engagement structure of the lock tail 31, even if it rises by about 2 to 3 mm, the head 18 and tail 3 cannot be opened further.
1, the dangerous opening of the upper mold 15 side can be prevented.

According to the tire vulcanizer of the present invention, the opening/closing mechanism and the tightening mechanism of the upper and lower molds 15, 14 in the tire vulcanizing machine are separated, and the driving sources of the opening/closing mechanism and the tightening mechanism are both driven by a fluid pressure cylinder. By doing so, there is no need for large and heavy structures such as the vulcanizer base, upper beam, side link, bull gear, etc. that are essential for mechanical tire vulcanizers, and the machine can be made lighter and more compact. This is easily possible, reduces machine costs, and has an independent opening/closing mechanism and tightening mechanism for each set of upper and lower molds, making it possible to use multiple molds such as the twin type shown in the example. In a vulcanizer in which sets are installed side by side, a uniform clamping force distribution can be obtained over the entire circumference of the mold in each upper and lower mold set, and there is no problem such as deviation in the center accuracy of the upper and lower molds due to thermal expansion. This ensures improved vulcanization precision and stability. At this time, unlike a mechanical tire vulcanizer, the threaded portion of the mold height adjustment device is not included in the mold clamping force transmission mechanism, and in the present invention, the clamping fluid is provided around the outer periphery of the upper and lower molds 15 and 14. Due to the tightening mechanism using the pressure cylinder 2, its piston rod 17, and lock shaft 32, there is no risk of deviation in the center accuracy of the upper and lower molds, and the lock position can be adjusted extremely easily depending on the mold height, ensuring complete tightening at all times. When opening and closing the mold, the plurality of fluid pressure cylinders 4, 4 arranged around the outer periphery of the upper mold 15 allows smooth and stable mold opening and closing using a mechanism that is smaller than the conventional method using hydraulic pressure. In addition, it is easy to operate only one upper and lower mold on the same vulcanizer while stopping the other upper and lower molds, compared to systems where multiple sets of upper and lower molds must be driven synchronously at all times. As a result, it is possible to freely change operations and improve operating efficiency, which is an excellent advantage for a new tire vulcanizer.

[Brief explanation of drawings]

Fig. 1 is an overall front view of an embodiment of the tire vulcanizer of the present invention, Fig. 2 is a cross-sectional plan view taken along the line CC in Fig. 1, Fig. 3 is a side view of the same, and Fig. 4 is Fig. 1 B-B. A cross-sectional plan view taken along the line, and FIG. 5 is a side sectional view taken along the line A--A in FIG. DESCRIPTION OF SYMBOLS 1... Vulcanizer base, 2... Fluid pressure cylinder for tightening, 3, 27... Guide, 4... Fluid pressure cylinder for lifting/lowering, 5... Upper slide, 9... Leg for locking, 14... ...Lower mold, 15...Upper mold, 4a, 17
... Piston rod, 18 ... Lock head, 3
2...Lock axis, 31...Lock tail.

Claims (1)

[Claims] 1 Consists of a lower mold fixed on a vulcanizer base, and an upper mold that can be vertically raised and lowered toward the lower mold to open and close, and the upper mold has a plurality of molds arranged correspondingly around the periphery thereof. The clamping mechanism for both molds includes piston rods which are equally distributed on the vulcanizer base, surrounding the outer periphery of the lower mold, and equipped with locking portions thereof. A plurality of tightening fluid pressure cylinders are provided whose locking positions can be varied up and down according to the mold height, and a plurality of tightening fluid pressure cylinders are attached to the outer periphery of the upper mold in correspondence with the tightening fluid pressure cylinders and are engaged with the piston rod portion of the cylinders. A hydraulic tire vulcanizer characterized by being provided with a removable and rotatable tightening lock shaft.