JPH0737032B2 - Tire vulcanization molding method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tire vulcanization molding method.

[0002]

2. Description of the Related Art A fixed lower mold installed on a vulcanizer frame, and a movable upper mold provided on the lower surface side of a lifting table and opened and closed vertically toward the fixed lower mold, A tire vulcanizer (tire vulcanizing press) for vulcanizing and molding a tire in the upper and lower molds is known, for example, from US Pat. No. 3,870,443.

[0003]

In order to vulcanize and mold a tire in the upper and lower molds using the tire vulcanizer disclosed in the above-mentioned publications and the like, a green tire is molded in the mold. The upper die is vertically movable in order to be loaded into the upper die, and the pressure of the pressurizing device (hydraulic cylinder) is transmitted to the upper die side.

Therefore, in order to easily carry in the green tire, the upper mold must be moved up and down by a necessary and sufficient amount, and accordingly, the stroke of the hydraulic cylinder is also lengthened accordingly. There must be. This means that when vulcanizing the tire, if a pressure drop occurs due to leakage of hydraulic fluid from the packing of the hydraulic line of the hydraulic cylinder, the gap at the mating surfaces of the upper and lower molds exceeds the limit opening amount. There is a risk of causing a serious accident in which the vulcanizing medium inside the mold, that is, pressurized steam, high-pressure hot water, high-temperature high-pressure gas, etc., spouts to the outside.

Therefore, the present invention solves the problems of the prior art and improves the safety, facilitates the operation, improves the vulcanization accuracy, and further improves the productivity. The purpose is to provide a vulcanizer.

[0006]

According to the present invention, there is provided a fixed lower mold installed on a vulcanizer frame, and a vertical lower direction which is provided on the lower surface side of a lift table and is opened and closed toward the fixed lower mold. A movable upper die, an upper die elevating means for vertically elevating the movable upper die through the elevating table, a die pressure device provided on the upper side of the vulcanizer frame, and an upright table installed on the elevating table. A pressing force transmitting member for transmitting the pressing force of the mold pressing device to the movable upper mold;
A tire vulcanizer having a hollow portion penetrating in the upper side of the vulcanizer frame in the vertical direction and into which the pressing force transmitting member can be inserted when the movable upper die moves up and down in the vertical direction. In the method of vulcanizing and molding the tire in the upper and lower molds, the following technical means are taken to achieve the above-mentioned object.

That is, according to the present invention, when the green tire is loaded on the lower mold, the movable upper mold is vertically lifted by the upper mold lifting means through the lifting platform, and at this time, the pressing force transmission member is applied. It is inserted into the hollow portion provided on the upper side of the sulfurizer frame, and then the movable upper mold is vertically lowered toward the lower mold through the lifting platform by the upper mold lifting means to close the mold, and thereafter, It is characterized in that the tire is vulcanized and molded in the upper and lower molds in a state where the pressing force of the mold pressing device is transmitted to the movable upper mold via the pressing force transmission member.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail below with reference to the drawings. First, referring to FIG. 1, a tire vulcanizer used in the present invention will be described. 1 is a vulcanizer frame,
Base frame 1a on the lower side and top frame on the upper side
It consists of 1b and a side frame 1c.

In the drawing, a twin type in which two vulcanizing molds are arranged in parallel is illustrated with a part (right side) omitted, but a single type or other vulcanizer may be used. 2
Is a vulcanization type and is a lower type installed on the base frame 1a
3 and a movable upper mold 4 which can be opened and closed in a vertical direction (towards the lower mold 3). Inside the vulcanization mold 2,
A cavity (not shown) is formed, and a green tire is loaded into this cavity by using a tire loader or the like, and the inner surface of the tire can be sheared through a central mechanism such as a bladder provided on the lower mold 2 side.

Reference numeral 5 denotes an elevating table for vertically elevating the upper mold 4 fixed to the lower surface of the elevating table, and a slide liner 7 slidably guided by an elevating guide 6 provided on the side frame 1c. have. 8 is a pressurizing device, which is the upper side of the vulcanizer frame 1, that is, the top frame 1b.
The lower surface of the vulcanization mold 2 and the center vertical line of the vulcanization mold 2 are aligned with each other.

That is, the pressurizing device 8 comprises a fixed cylinder tube 9 and a piston 10 fitted in the cylinder tube 9, and the piston 10 has a hollow portion inside.
The top frame 1b has a hollow portion 12 corresponding to the hollow portion 11 and has a hollow portion 12 at the upper side of the vulcanizer frame 1 which is vertically penetrated. 1
1,12 are provided on the mold center line.

Reference numeral 13 is a cylinder lid, and the tube 9
A piston return spring 14 is interposed in the tube 9 between the cylinder lid 13 and the lower surface side of the piston 10 so as to be detachably fixed to the lower end surface of the piston 10. Reference numeral 15 is a pressing force transmission device, which is composed of a transmission member 16 having a cylindrical column structure and erected at the center of the mold on the upper die 4 side, and a relay member 17. Both of the transmission members 16 have a cylindrical column structure. First transmission member
This embodiment is composed of 18 and the second transmission member 19.

The first transmission member 18 has an outward flange at its lower end.
This outward flange 20 is mounted on the elevating table 5 through a pressing metal fitting 21 having a split structure and is erected upright. A male screw 22 is formed on the upper part of the first transmission member 18. There is. The second transmission member 19 has a female screw 23 at the lower end thereof.
The male screw 22 of the first transmission member 18 is screwed into the screw 23 to be screwed together, and the upper side of the second transmission member 19 is inserted into the hollow portions 11 and 12. That is, the upper side of the transmission member 16 is vertically movable in the hollow portions 11 and 12 on the vulcanizer frame 1 side. Further, the second transmission member 19 has a slit 24 formed in the vertical direction, and further, in the mold closed state, the engagement step portion 25 is provided at the lower end side position of the piston 10 in the pressurizing device 8 as shown in FIG. Formed on.

As shown in FIG. 2, the relay member 17 is composed of a pair of engaging arms 26, and each arm 26 is pivotally supported on the pressurizing device 8 side by a pin 27 so as to be openable / closable (expandable / contractible). The sides are connected by a telescopic cylinder 28, through which the inner peripheral arc surface 26A of the engaging arm 26 is operated through the operation of the telescopic cylinder 28.
Are arranged along the outer peripheral surface of the second transmission member 19 and can be engaged with and disengaged from the engagement step portion 25.

In addition, in FIG. 2, 29 is a reed switch type limit switch, and 30 is a stopper for restricting the open position of the engaging arm 26. Reference numeral 31 denotes an upper die elevating means, which is provided with a drive body 33 represented by a torque motor capable of forward and reverse rotation having an electromagnetic brake 32 attached to the top frame 1b as shown in FIG. 3, and a reduction mechanism on the output shaft side of the drive body 33. The reduction gear mechanism 34 has its shaft interlockingly connected to a first bevel gear 36 via a coupling 35.

The first bevel gear 36 is supported by a bearing box 37 fixed to the top frame 1b, and the first bearing box 37 is fitted into the slit 24 in a loosely inserted manner to face the second transmission member 19, and A vertical second bearing box 38 is housed in the second transmission member 19, the second bearing box 38 is attached to the first bearing box 37, and the second bearing box 38 meshes with the first bevel gear 36. Second
The bevel gear 39 is supported. Further, an elevating shaft 41 such as a screw shaft or a ball screw shaft is erected at the center of the upper die elevating table 5 via a fixture 40, and the elevating shaft 41 has an axis centered on the cylinder axis of the transmission member 16. A female screw cylindrical body having a screw nut, a ball screw nut, or the like, which is inserted into the cylinder of the transmission member 16 and is fixed in the boss of the second bevel gear 39.
42 is threaded through.

The elevating means 31 is shown as a screw thread type in the drawing as a means for converting a rotary motion into a linear vertical motion, but other than this, for example, a rack and pinion type, a telescopic cylinder type or the like may be used. Need only be internally contained in the pressing force transmission member 16 having a cylindrical structure. Reference numeral 43 denotes an upper die height adjusting means, which is provided on the pressing force transmission member 16 on the elevating table 5, and is provided as a so-called exterior type for facilitating maintenance and the like, and is provided separately from a heat source and the like. ing. Specifically, as shown in FIG. 4, a plurality of insertion / removal lock holes 45 of the adjustment handle 44 are formed in a radial arrangement in the middle of the first transmission member 18 in the height direction, and project downward from the second transmission member 19. The bracket 46 is extended as a shape, and this bracket 46
A lock piece 48 having a knob 47 is urged and supported by a spring 49 in the engaging direction, and the tip of the lock piece 48 is supported by the first transmission member 18.
The lock hole 45 can be engaged and disengaged.

That is, with the lock piece 48 separated from the lock hole 45, the handle 44 is inserted into the other lock hole 45 and rotated in the direction of the arrow in FIG.
The lifting table 5 is moved up and down by the screwing of 23, the height of the upper mold is adjusted there, and after the adjustment, it is locked by the lock piece 48. It should be noted that this height adjustment can be performed electrically as necessary.

In addition, in FIG. 1 and FIG. 6, 50 is a pump unit, and 51 is liquid sending (hydraulic) piping.
The pump unit 50, as shown in FIG. 6, takes in the oil from the outside to the hydraulic pump 55 side via the filter 52, the air regulator 53, and the air switching valve 54, and sucks up the oil in the oil tank 56 via the filter 57. The pressure oil is supplied to each of the two pressurizing cylinders by the piping 51 through the solenoid valve 58, the pressure switch 59 and the like. In addition, in FIG. 2, reference numeral 60 is an upper and lower limit detection limit switch for the pressure piston, and 61 is an operating piece thereof. Further, in FIG. 1, 62 is a lower dome and 63 is an upper dome.

Next, the vulcanization molding of a tire using the above-mentioned tire vulcanizer will be described. A green tire is loaded on the fixed lower mold 3 by using a tire loader or the like. For this purpose, it is necessary to raise the movable upper die 4 in the vertical direction by the upper die raising / lowering means 31 via the raising / lowering table 5 in a necessary and sufficient manner. That is, by driving the elevating / lowering drive body 33 to rotate the female screw cylindrical body 42 via the bevel gears 36, 39, the elevating shaft 41 indicated by a male screw shaft is raised to guide the slide 7 to the vertical elevating / lowering guide 6. Movable upper die 4 rises through and is retracted by opening from lower die 3. In this case, the upper part of the transmission member 16 is the hollow parts 11 and 12 provided on the vulcanizer frame 1 side.
It is housed in the inside and moved up and down, and when releasing the upper mold 4, there is no interference of the transmission member 16 with the vulcanizer frame 1 side, and the upper mold 4 can be lifted sufficiently high.

Thereafter, the movable upper die 4 is lowered toward the lower die 3 by the upper die elevating means 31 via the elevating table 5 to close the die,
Thereafter, the pressurizing force of the die pressurizing device 8 is transmitted to the movable upper die 4 via the transmitting member 16, and is vulcanized and molded in the upper and lower die 3, 4 in a clamped state. The vulcanized tire can be discharged from the vulcanizer through the tire unloader or the like by being detached from the lower mold 3 by raising the central mechanism, and then being detached from the bladder, and can proceed to the next vulcanizing operation. Loading set of new green tires into fixed lower mold 3, pre-shaping of tire inner surface shape by central mechanism and bladder, and movable upper mold 4
The mold closing and pressurization are performed by lowering the elevating shaft 41 by reversing the female screw cylinder body 42, and along with this, the transmission member 16 is also descended to close both molds 3 and 4. rear,
The transmission member 16 in the state shown in FIG.
The engagement arm 26 of the relay member 17 is closed and locked with respect to the engagement stepped portion 25, and the pressure piston 10 of the pressure cylinder 9 is pressurized and lowered, so that the transmission member 16 is transmitted through the relay member 17. The pressing force is transmitted to the side and the mold clamping pressure is applied. Further, as described above, the adjustment of the tire size and the height of the upper mold 4 by the vulcanization mold can be easily obtained by operating the handle of the height adjusting mechanism 43, that is, the forward / reverse rotation operation of the adjusting fitting 44.

In the conventional tire vulcanizing press, means for vertically moving up and down the upper mold via the lifting platform is provided in pairs before and after leaving the center of the mold, or left and right. If the raising and lowering means of (1) were not operated in synchronization, the parallelism of the mold might be lost. With respect to this point, in the embodiment of the present invention, since the pressing force transmission member (elevating means) is erected on the lift table on the center of the movable upper mold, the parallelism of the mold is not lost.

[0023]

According to the present invention, since the transmission member is erected on the elevating table to transmit the pressing force of the piston of the pressurization device to the transmission member, the cylinder stroke of the pressurization device during vulcanization. The pressing force can be transmitted to the upper mold without increasing the length (longer), and a short stroke type pressurizing device can be used here. This means that the stroke of the pressurizer is a short tightening stroke that only applies the pressurizing force, and it can be designed to be less than the safe opening amount of the vulcanization type. Also, the mold opening more than the tightening stroke can be surely prevented by the transmission member and the ejection of the vulcanizing medium is prevented, which is safe.

Further, since the stroke of the pressurizing device is shortened, the mold can be clamped immediately and accurately. Furthermore,
Even if the pressurizing force transmission member is erected on the lifting table having the upper die on the lower surface, the vulcanizer frame side has a hollow portion in which the transmission member can be accommodated. The green tire can be loaded and the molded tire can be taken out reliably and easily, and the productivity can be improved.

[Brief description of drawings]

FIG. 1 is an overall vertical cross-sectional front view of a tire vulcanizer used in the present invention with a part (right side) omitted.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG.

4 is a cross-sectional view taken along the line CC of FIG.

5 is a cross-sectional view taken along the line DD of FIG.

FIG. 6 is a diagram illustrating an example of a pressure pump unit.

[Explanation of symbols]

 1 Vulcanizer frame 2 Vulcanizing type 3 Lower type 4 Upper type 8 Pressurizing device 9 Pressurizing cylinder 10 Pressurizing piston 12 Hollow part 15 Pressurizing force transmitting device 16 Pressurizing force transmitting member 31 Upper die lifting means 43 Upper die height Adjustment means

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location B29L 30:00

Claims (1)

[Claims] 1. A fixed lower mold installed on a frame of a vulcanizer, a movable upper mold provided on a lower surface side of a lifting platform and opened and closed vertically toward the fixed lower mold, and the lifting platform. Upper mold lifting means for vertically moving the movable upper mold through the mold, a mold pressurizing device provided on the upper side of the vulcanizer frame, and a pressurizing force of the mold pressurizing device that is erected on the lift base. To the movable upper die, and a hollow through which the upper portion of the vulcanizer frame penetrates vertically and the pressing force transmission member can be inserted when the movable upper die moves up and down in the vertical direction. And a method of vulcanizing and molding a tire in the upper and lower molds using a tire vulcanizer including:
The movable upper die is vertically lifted by the upper die lifting means via the lifting platform, and at this time, the pressing force transmission member is inserted into the hollow portion provided on the upper side of the vulcanizer frame, and then the upper die is moved. By the elevating means, the movable upper die is vertically lowered toward the lower die via the elevating table to close the die, and thereafter, the pressing force of the die pressurizing device is transmitted to the movable upper die via the pressing force transmission member. A vulcanization molding method for a tire, characterized in that the tire is vulcanized in the upper and lower molds in this state.