JPH0124047B2 - - Google Patents

Description

Detailed Description of the Invention The present invention simplifies the entire mechanism and structure of a tire vulcanizer without compromising safety, and enables efficient and accurate tire vulcanization using economical equipment. Regarding what was made possible to obtain.

As is well known, a tire vulcanizer has a fixed lower mold installed on a base frame, and a press mechanism for the lower mold using crank gears, side links, top links, etc., or a hydraulic cylinder that also opens and closes the mold. A movable upper mold that can be opened and closed by pressurizing means, and a "bladder" that is placed at the center of the lower mold to shape the inner surface shape of the green tire and maintain internal pressure during vulcanization. In addition to expanding and contracting the elastic molded body,
Shaping and vulcanization of various types of green tires are performed using a central mechanism that supplies heat-pressure media such as steam and hot gas as the main component, but all conventional vulcanizers have extremely complex mechanisms and structures. At the same time, large-scale mechanization is required, and operation and maintenance are troublesome, both of which are disadvantageous in that they increase tire production costs.

The present invention is a step forward in solving or improving these problems, and its features include a fixed lower mold, a movable upper mold that can be opened and closed with respect to the lower mold, A tire vulcanizer comprising an elastic molded body for shaping and a central mechanism disposed at the center of the lower mold, wherein the movable upper mold is vertically movable up and down toward the lower mold via a fluid pressure cylinder for opening and closing the mold. A mold pressurizing mechanism using a short stroke fluid pressure cylinder supported by the slide member and separate from the mold opening/closing hydraulic cylinder is provided, and between the same type pressurizing mechanism and the upper mold supporting slide member, The spacer, whose length is adjustable, is provided so that it can be inserted and retracted and can be pressurized by the mold pressurizing mechanism during intervention.

The present invention will be described in detail below based on the illustrated embodiment. The illustrated example shows an example in which the present invention is implemented in a motorcycle tire vulcanizer, but of course the type of tire can be freely applied. FIG. 1 is an overall view including a partial cross section of a twin-type vulcanizer, and the vulcanizer frame includes a top frame 1, a base frame 16 equipped with a stand 15, and both upper and lower frames 1, 16. Side frame 17 connecting the side edges,
It is formed into a rectangular frame shape by 17,
A lower mold 10 is mounted on the base frame 16, and a lower heating plate (steam platen, etc.) 6 and a lower heat insulating material 12 are mounted on the base frame 16.
A wall-shaped lower shield 9 is erected surrounding the outer periphery of the lower mold 10. Further, an elastic molded body for shaping and a center mechanism are provided at the center of the lower mold 10, and these will be described later. A movable upper mold 11 with respect to the lower mold 11
is set as follows. In the illustrated example, two mold opening/closing fluid pressure (hydraulic) cylinders 5, 5 on the left and right are installed on the top frame 1 side of the vulcanizer frame described above, and each piston rod 5 of the cylinders 5, 5
A slide member 2 is supported by a and 5a so as to be able to move up and down, and an upper mold 11 is attached to the lower surface of this slide member 2 via an upper heating plate (steam platen, etc.) 7 and an upper heat insulating material 13. 1 and 1 on the left and right circumferential sides of member 2.
As illustrated in FIG. 2, which is a sectional view taken along the line, liners 4, 4 are provided.
Since it is a side frame 17 and a twin type, it is slidably engaged with guides 3, 3 provided on a center frame 18 erected between the side frames 17, 17, thereby maintaining the straight vertical movement of the upper mold 11. do. Further, the upper end of the central cylindrical portion 2a of the slide member 2 is provided with a head 2b for engaging with a spacer 100, which will be described later. 1
Reference numeral 4 designates a trunnion receiver for mounting the mold opening/closing hydraulic cylinder 5 described above.

Separately from the mold opening/closing cylinders 5, 5, the present invention includes a mold pressurizing device 5 using a short stroke fluid pressure cylinder.
0 is placed on the top frame 1 side at the center of the mold as shown. As illustrated in FIGS. 5, 6 and 7, the same type pressurizing device has a short stroke fluid pressure (hydraulic) cylinder 51 attached to the top frame 1, and a fastening bolt 6 attached to the cylinder 51.
The piston 52 can be moved up and down by a short stroke through the cylinder lid 53 closed by the gasket 5.
5, the lid 53 and the piston 52
A return compression spring 54 is interposed between them, 56 is a hydraulic port, and 57 is a drain outlet. Further, as illustrated in FIG. 6, which is a plan view taken along the line - in FIG. The actuating rod 58 is slidably inserted to the outside from the cylinder lid 53 via a bush 61, and the actuating rod 58, which accompanies the ascent and descent of the piston 52, controls a limit switch 60 for confirming pressurization due to the downward movement of the piston and a limit switch 60 for confirming pressurization due to the upward movement of the piston. A limit switch 59 for pressurization release confirmation is provided to facilitate automatic control.

A spacer 100 as illustrated in FIGS. 1, 2, and 4 is provided between the slide member 2 and the mold pressurizing device 50. As shown in detail in FIG. 2 and FIG. 4, which is a side sectional view taken along the line in FIG. is rotatably supported, and a piston rod 107a of a drive cylinder 107 for forward and reverse rotation is connected to the pivot shaft 103 via a connecting arm 108, and the pivot arm 102 is connected to the pivot shaft 103 via a lock pin 106 or the like. The spacer main body 101 is fixedly installed and inserted into the holder sleeve 102a provided at the tip of the rotating arm 102, and the lifting bolt 11 is installed in the flange 114 at the lower end of the main body, as shown in the enlarged view of part A in FIG.
1 to the locking portion 115 of the sleeve 102a, a lock nut 112, a flat washer 113, and a compression spring 1.
By elastically supporting the spacer body 101 through the spacer 10, the spacer body 101 is held in a raised position.
This is so that the spacer body 101 can be inserted and removed smoothly between the piston 52 of the mold pressurizing device 50 described above and the head 2b of the slide member 2 described above. An adjustment screw 109 is attached to the lower end through a screw hole 116 so that it can be adjusted up and down, and as described later, the entire length of the spacer body 101 can be adjusted in response to changes in the height of the vulcanizing mold. The right side of FIG. 2 shows the spacer 100 in its intervention set state, and the left side of the drawing shows its retracted state. The left side of the figure shows the case where vulcanizing molds with relatively high heights are used as the upper and lower molds 11 and 10, and the right side of the figure shows the case where vulcanizing molds with relatively short heights are used. This shows a state in which the intervention length of the spacer body 101 can be easily adjusted in accordance with the mold size by raising and lowering the adjustment screw 109. Also, on the left side in the figure, between the upper end of the spacer body 101 and the piston 52 in the mold pressurizing device 50, and the spacer body 101
A gap of about 2.5 mm is created between the head 109a of the adjustment screw 109, which is the lower end of the spacer body 109, and the head 2b of the slide member 2, using the aforementioned lifting bolts 111. Smooth intervention and evacuation is now possible.

FIG. 3 shows an example of the detailed structure of the center mechanism and shaping elastic molded body disposed at the center of the fixed lower mold 10 mentioned above,
In the figure, a lift cylinder 96 is provided in a cylinder guide 95 fixed to the base frame 16 so as to be movable up and down, and an upper ring 93 is attached to the upper end of a piston rod 94 installed in the cylinder 96 so as to be movable up and down via fluid pressure. At the same time, a lower ring 92 is fixed to the upper end of the lift cylinder 96 via a housing 92a, and the upper ring 93 and the lower ring 92 shape the inner surface shape of the green tire 97 and maintain internal pressure during vulcanization. Elastic molded bodies (such as rubber bags commonly known as Prada) 91
The upper and lower ends of the holder are clamped, respectively. In the illustrated example, a thermopressure medium for shaping steam, hot gas, etc. and for internal pressure is supplied through a passage 92b of a housing 92a by a thermopressure medium supply/discharge pipe 98 (separate inlets and outlets). In FIG. 1, reference numeral 99 indicates a cylinder for raising and lowering the lift cylinder 96 described above.
The central mechanism 90 and the elastic molded body 91 may be similar to those used in conventional tire vulcanizers of this type, and are therefore not limited to the structure shown in FIG. A central mechanism, for example, a type that expands and contracts the elastic molded body 91 by a mechanical lifting means without using a fluid pressure cylinder, and a lift cylinder 9 may be used.
It is free to use a knockout lever mechanism instead of the cylinder 99 for raising and lowering the cylinder 6.

The present invention is illustrated as a twin type in which two sets of vulcanizing molds are arranged in parallel in one vulcanizer, but of course, the present invention is a twin type in which two sets of vulcanizing molds are arranged in parallel in one vulcanizer. It can be applied to a single type of vulcanization type as well as to a vulcanizer in which a post-inflator device for vulcanized tires is installed in parallel in a part of the vulcanizer. The unloader means is omitted. In addition, the reference numeral 80 in FIG. 1 indicates a slide fall prevention device, and this device 80 is used for inspection and other purposes when the upper mold 11 is raised and opened by the mold opening/closing fluid pressure cylinder 5. Upper and lower members 1, 1
This is to prevent the upper die 11 from falling due to oil pressure leakage or other failure on the cylinder 5 side when entering the space between 0 and 0. For example, the return spring 8
The slide member 2 is advanced and locked at the end point of the raised position using an appropriate advance/retreat driving means, such as by connecting and supporting the piston of a single-acting air cylinder 83 provided with the slide member 2 and automatically advancing and retracting it. This is not essential, but is appropriate for increasing safety.

The green tire vulcanization molding cycle in the tire vulcanizer of the present invention proceeds as follows. That is, by raising the piston rod 5a of the mold opening/closing fluid pressure cylinder 5, the upper mold 11 is raised together with the slide member 2, and the lower mold 10 is opened. The green tire 97 is set on the lower die 11 by the tire carrying means, and then the piston rod 94 of the lift cylinder 96 in the central mechanism 90 is lowered to contract and close the elastic molded body 91 in the extended position into a flat shape, and the green tire 97 is placed in the lower mold 11. The piston rod 94 is loaded along the inner surface of the tire 97 and enters the preshaping process while supplying a thermopressure medium such as steam or hot gas into the elastic molded body 91. temporarily stop. At the same time, the piston rod 5a of the mold opening/closing fluid pressure cylinder 5 is lowered to begin the process of closing the upper mold 11 onto the lower mold 10. At this time, the spacer 100 is shown in the left half of FIG. It is in the evacuation position. In this way, the slide member 2 is successively lowered, and the upper die 11 that is lowered together with it is brought into contact with the upper ring 93 of the piston rod 94 in the lift cylinder 96 that is stopped at the stacking height position and lowered. As a result, the upper ring 93 and the piston rod 94 are lowered, and the upper mold 11 is closed on the lower mold 10 as shown in FIGS. When the closing process is completed and the shaping process following the pre-shaping process progresses, it is necessary to pressurize the upper and lower dies 11 and 10. Here, as shown in FIGS. 2 and 3, the piston rod 107a of the driving cylinder 107 is advanced to rotate the pivot shaft 103, and the pivot arm 102 is pivoted toward the mold center position. The spacer 100 in the retreated position is the upper and lower type 1
1 and 10, and the spacer main body 101 at the tip of the arm presses the mold pressurizing device 50.
As mentioned above, by setting a gap of about 2.5 mm between the piston 52 of the cylinder 51 and the center head 2b of the slide member 2, the piston 52 of the cylinder 51 enters smoothly into the state shown in FIG. 1. .

Therefore, by supplying hydraulic pressure into the cylinder 51 of the mold pressurizing device 50 and lowering the piston 52 by about 2.5 mm against the compression spring 54, the piston 52 and the upper end of the spacer body 101 collide, and further By lowering the lifting bolt 111 by about 2.5 mm against the compression spring 110,
Head 109 of adjustment screw 109 in main body 101
a hits the head 2b of the slide member 2, and the mold is maintained closed by the amount of pressure applied by the mold opening/closing fluid pressure cylinder 5, and together with the amount of pressure applied by the cylinder 51 of the mold pressurizing device 50, both the upper and lower molds 11 ，
10 is completely clamped and pressurized, and the green tire 97 is pressurized and vulcanized through increasing the internal pressure of the thermopressure medium in the elastic molded body 91 and heating by the hot platens 7 and 6 of both the upper and lower molds 11 and 10. You will be killed. In this way, as the predetermined vulcanization time elapses, the heating is stopped, the mold is opened, and the vulcanized tire is taken out. The spacer main body 101 can be released by raising the spacer body 101 in a backward motion by 54, so the drive cylinder 107 in the spacer 100 is actuated, the rotation shaft 103 is reversely rotated, the rotation arm 102 is moved backward, and the spacer body 101 is released. The main body 101 is returned from the intervention position on the right side in Figure 2 to the retracted position on the left side in Figure 2. Next, the mold opening/closing cylinder 5 is operated in reverse to raise the piston rod 5a, thereby raising the upper mold 11 and returning it to the open position, and the locking pin 81 is locked to the slide member 2 by the slide fall prevention device 80. After preventing any accidental fall, as shown in FIG. 3, the lift cylinder 96 is raised from the position shown, and the vulcanized tire 97 is separated from the lower mold 10 together with the elastic molded body 91 and raised. The piston rod 94 is raised to expand and expand the elastic molded body 91 from the inner surface of the tire, and the tire 97, whose bottom has been supported in advance with an unloader or the like, is
The elastic molded body 91 will be bypassed and carried out.

The tire vulcanizer of the present invention has the following features and advantages over conventional tire vulcanizers. That is, in the present invention, as the vulcanizer configuration, the movable upper mold 11 that can be opened and closed is vertically raised and lowered to the fixed lower mold 10, so that only the mold opening/closing fluid pressure cylinder 5 is sufficient as the opening/closing driving source. Compared to the conventional press opening/closing type using a crank gear, side link, top link, etc., the required mechanism is significantly simplified, and it can be compactly installed in a simple square frame as shown in the figure. Furthermore, in the present invention, the upper and lower molds 11, 1
0 mold clamping pressure, unlike conventional mold opening/closing fluid pressure cylinders that provide 100% of the pressurizing force, a mold pressurizing device 50 and a spacer 100 are used.
By employing the pressurizing-only mechanism, there is no need to make the mold opening/closing fluid pressure cylinder 5 large and powerful, and this also enables a compact design and assembly of the vulcanizer. Moreover, the mold pressurizing device 50 of the present invention
According to the mold pressurization by the spacer 100 and the mold pressurizer 100, as is clear from the embodiment, the short stroke fluid pressure cylinder 5 is used as the pressurizing drive source in the mold pressurizer 50.
1 can be adopted, and the upper and lower molds 11 and 10 can be reliably and powerfully pressurized through the spacer body 101 of the spacer 100 by a slight vertical movement of the piston 52 in the cylinder 51 that is stopped at about 5 to 7 mm. A seal is obtained, and even if the hydraulic pressure from this pressurizing cylinder 51 were to be released, the pressure on the upper die 11 side due to the internal pressure of the thermopressure medium within the elastic molded body 91 during vulcanization would be approximately 5 to 7 mm. It is extremely safe as it can only be opened
At this time, if the upper and lower shields 8 and 9 are placed with dimensions that overlap when closed, the steam
Accidents such as direct blow-off of hot gas etc. are prevented, significantly improving safety. Moreover, in the present invention, the spacer body 101
By simply moving the adjustment screw 109 up or down, the tire can be easily and easily changed in response to the difference in the upper and lower molds 11 and 10 used depending on the tire size, and its versatility is sufficient. In addition, the cylinder mechanism for pressurization can be extremely simple and compact, and together with the opening/closing cylinder 5 described above, it is a fluid pressure cylinder used in the vulcanizer, and unlike conventional ones, it does not require a large and powerful cylinder. It is easy to miniaturize the entire vulcanizer and obtain a compact assembly form, and by making the spacer 100 a rotating type as shown in the figure, it can be easily installed on the periphery of the vulcanizer. , its movement in and out is also quick and easy. In particular, the height adjustment of the spacer 100 by raising and lowering the adjustment screw 109 of the spacer body 101 is difficult in conventional vulcanizers of this type, which have a complicated height adjustment mechanism built into the upper dome or platen side that supports the upper die. The required mechanism is simple and easy to operate compared to the conventional type, and in contrast to the conventional type, which often causes trouble with the upper die tilting, the present invention separates the upper die 11 from the height adjustment mechanism. There is no risk of this happening, and there is no deterioration in the accuracy of the vulcanized tire due to the tilt of the upper mold, and the upper and lower molds are always properly closed and set.
Accurate vulcanization results can be obtained.

As described above, the tire vulcanizer according to the present invention significantly simplifies the elements and mechanisms that make up the vulcanizer, making it possible to economically obtain a compact, economical, and functionally superior product. It is excellent in that it is small, easy to maintain, and allows efficient vulcanization work.

[Brief explanation of drawings]

Fig. 1 is a partially vertical front view of an embodiment of the vulcanizer according to the present invention, Fig. 2 is a cross-sectional plan view taken along the line shown in Fig. 1, and Fig. 3
The figure is a longitudinal sectional front view of the main part of the central mechanism, and Figure 4 is the second
Figure 5 is a side sectional view of the embodiment of the same type of pressurizing device, Figure 6 is a plan view taken from the line of Figure 5, and Figure 7 is the same type of pressurizing device switch actuating part. FIG. DESCRIPTION OF SYMBOLS 1... Top frame, 16... Base frame, 17... Side frame, 10... Fixed lower mold, 11... Movable upper mold, 5... Fluid pressure cylinder for mold opening/closing, 50... Mold pressurizing device, 51...Short stroke fluid pressure cylinder, 52...Piston, 90...Center mechanism, 91...Elastic molded body, 97...Green tire, 100...Spacer, 101...Spacer body, 109...Adjustment screw.

Claims (1)

[Claims] 1 A tire vulcanizer comprising a fixed lower mold, a movable upper mold that can be opened and closed with respect to the lower mold, and an elastic molded body for shaping and a central mechanism disposed at the center of the lower mold, wherein the movable upper mold The mold is supported by a slide member that can vertically move up and down toward the lower mold via a mold opening/closing fluid pressure cylinder, and a mold pressurizing mechanism using a short stroke fluid pressure cylinder is provided separately from the mold opening/closing fluid pressure cylinder. A spacer whose length in the vertical direction is adjustable is inserted and retracted between the same type pressure mechanism and the upper mold support slide member, and the mold can be pressurized by the mold pressure mechanism during intervention. A tire vulcanizing machine characterized by being installed in.