JPS626966B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a central mechanism of a tire vulcanizer, and more particularly to a drive device for the central mechanism.

In tire vulcanizers, a central mechanism called a bug adjustment device is used to shape green tires and perform other molding operations. Its advantages as a machine are currently recognized in the industry.

That is, with reference to FIGS. 10 and 11, the structure and behavior of the central mechanism of a tire vulcanizer currently in practical use will be outlined.

Fig. 10 shows the green tire T being loaded using the vertical loader 1 and in a position to start shaping, and Fig. 11 shows the mold being clamped and vulcanizing after the shaping is completed, and 2 is the fixed lower mold element. It is constructed by providing a lower mold 5 for molding half of the tire outer shape on a lower platen 4 containing a heating source 3. 6 is a movable upper mold element;
An upper mold 9 for forming the remaining half of the tire outer shape is provided on an upper platen 8 containing a heating source 7. The upper mold element 6 is tiltable or vertically movable relative to the fixed lower mold element 2, and can be clamped and opened.
Green tire T shaped with matching
A mold is formed to form the outer shape of the mold, and a heating pressure medium such as steam can be supplied from the outer peripheral areas of the upper and lower molds 5 and 9.

Reference numeral 10 denotes a central mechanism, and on the upper part there is provided an elastic molded body 11 such as a rubber bag that can be expanded and contracted, that is, an elastic molded body 11 for forming the inner surface of the tire. 2 to 3 radially from the lower area of the molded body through the let pipe 12.
A pressure medium such as steam of Kg/cm ² can be supplied, and during vulcanization, the pressure medium can be increased to about 21 Kg/cm ² (at a temperature of 180°C), After vulcanization, the pressure medium can be discharged from the elastic molded body 11 via a drain pipe (not shown).

The above-mentioned central mechanism 10 has a lift cylinder tube 14 fitted into a fixed cylinder guide 13 so as to be able to move up and down, and a piston 15 fitted into the tube 14 so as to be able to slide, thereby forming a driving device thereof. By sending fluid such as water pressure or oil pressure from a supply port 16 provided at the lower part of the piston 15, the piston 15 can be raised, and the upper ring body 18 can be raised via a connecting rod 17 or the like. On the other hand, by feeding the same fluid as described above from another supply port 19 provided at the lower part of the tube 14, pressure is applied to the upper side of the piston 15 via the supply pipe 20 etc.
5 is lowered and the upper ring body 18 is lowered via the connecting rod 17 etc. to a position where it abuts against the stopper 21, thereby performing a shaping operation.

On the other hand, a lower ring body 22 is provided at the upper part on the side of the cylinder tube 14, and a molded body 11 made of an expandable and contractible elastic material shown by Prada is detachably provided by this lower ring body 22 and the above-mentioned upper ring body 18. be. In addition, in FIGS. 10 and 11, 23 is a lifting device, and the central mechanism 10
The whole can be raised and lowered by the guide of a fixed cylinder guide 13.

A spacer 24 is detachably provided on the upper side of the piston 15, and by changing the length of the spacer 24, it is possible to adapt to the tire size. 25
is a guide piston or bushing, and spacer 2
The upper part of the guide piston 25 is slidably fitted into the tube 14, and a sealing material 26 is provided at the upper part of the guide piston 25 in correspondence with the outer circumference of the lower part of the stopper 21.
A guide bushing 27 fitted with is provided, and
A sealing material 26A is fitted in the upper part of the stopper 21 in correspondence with the stopper 21.

The central mechanism of the tire vulcanizer described above holds the molded body 11 in the state shown by the chain line in FIG.
A green tire T is loaded via a vertical loader 1 as shown in the figure.

Next, by applying pressure fluid to the upper side of the piston 15 to lower the upper ring body 18 and supplying a pressure medium into the elastic molded body 11, the elastic molded bodies 11 are sequentially moved from the lower side of the green tire T.
A so-called shaping operation is performed in which the upper ring body 18 is brought into close contact with the upper ring body 18 through expansion.
The connecting rod 17 ends at a position where it abuts against the upper end of the stopper 21, and during this process, the connecting rod 17
1, and pressure medium leakage within the elastic molded body 11 is prevented by the sealing material 26A.

When the above-mentioned shaping is completed, the loader 1 retreats and the movable upper mold element 6 is clamped in its place, and the upper ring body 18 is moved to the vulcanizing position shown in FIG. 12 with the stopper 21 and the guide piston 25 lowered. Therefore, the sealing performance of the outer periphery of the stopper 21 at this time is guaranteed by the sealing material 26.

In the position shown in FIG. 11, the green tire T is vulcanized by heating the upper and lower mold elements 2 and 6 and increasing the pressure of the pressure medium in the molded body 11.

After this vulcanization molding, the upper mold element 6 is opened, the entire center mechanism 10 is raised by the lifting device 23, the upper ring body 18 is raised, and the lower ring body 2 is lifted.
One cycle is completed through the step of unloading the vulcanized tire, which involves the elongation of the elastic molded body 11 caused by the lowering of the vulcanized tire.

As is already clear, the practical machines shown in Figures 10 and 11 are currently recognized as superior because they have a simple structure, can be designed compactly, and are inexpensive to manufacture. , it would be even more useful if the following points could be improved.

That is, supplying a pressure medium into the inside of the elastic molded body 11,
To prevent the leakage, seal material 2 is applied at the top and bottom.
6,26A, it is possible to prevent leakage to some extent, but due to the lack of space in the structure, it is not possible to use a complete sealing material, and for example, a slipper seal must be used at present.

In addition, since the sealing materials 26 and 26A described above are for sealing movable parts, although the sealing performance has been achieved to a certain extent, if even better sealing performance is required, it will be structurally difficult.

Furthermore, since the connecting rod 17 is indirectly supported and guided with respect to the cylinder tube 14 via the guide piston 25, the connecting rod 17 and the piston 2
5 and the sum of the gaps between the piston 25 and the tube 14, the upper ring body 18 slightly oscillates, and the accuracy is slightly deteriorated.

Whether the driving device is hydraulic or hydraulic, the lower ring body 2 is adjacent to the internal pressure part of the bag (molded body 11).
2, heat loss occurs and the heat balance between the upper ring body 18 and the upper ring body 18 is different, which results in a slight lack of uniformity in the degree of vulcanization. Although it would be nice if it were longer,
Requires a large amount of pressure medium and wastes thermal energy.

If the tire size is large or small, it is necessary to adjust the shaping stroke to accommodate this, but this is done by replacing the spacer 24, and since the spacer 24 is built-in, the replacement time is reduced. Requires.

In addition, since a fluid source is used as the drive device, there are some problems with ensuring watertight or oiltightness and piping.

Furthermore, since the thermopressure medium supply pipe 12 (the same applies to the discharge pipe) is installed outside the cylinder tube 14, it comes into direct contact with the outside air, which not only increases heat dissipation and causes a loss of thermal energy. The sealing performance of the pipe is also rather poor, leading to a complicated structure.

As outlined above, although the superiority of the core mechanism as a current practical machine is recognized to some extent,
As long as fluids were used as the driving source, some problems associated with this remained.

In view of the above-mentioned circumstances, the present inventors solved the above-mentioned problems by retaining the superiority of the above-mentioned practical machine and using a mechanical drive device.

That is, the present inventors replaced the conventional fluid as a driving device in the central mechanism of a tire vulcanizing machine with a screw rotating body using a so-called screw nut and converting the motion of this rotating body into relative vertical linear motion. In addition to securing the superiority of the above-mentioned practical machine and further ensuring sealing performance and heat balance, pipes for supplying and discharging thermopressure medium to the elastic molded body are provided inside the tube. The purpose of this is to avoid direct contact with the outside air and reduce heat dissipation.

In order to achieve such an object, the present invention includes an upper mold element and a lower mold element that can be opened and closed mutually, and an elastic molded body that can expand and contract and an elastic molded body inside the green tire that is inserted into the upper and lower mold elements to change the inner surface shape of the green tire. In a tire vulcanizer that shapes and vulcanizes via a thermopressure medium enclosed in a tire, a tube whose upper end is attached to a lower ring body whose upper end is an elastic molded body is attached to a guide cylinder provided vertically on the stationary side. The tube is fitted into the tube so as to be freely raised and lowered, and a screw rotating body consisting of a screw screw shaft and a screw nut cylinder to which the screw shaft is screwed is built-in. The cylindrical body is connected to the upper ring body of the elastic molded body through a connecting rod, and furthermore, a driving body is provided in the outer region of the tube for transmitting a starting force to the screw rotation movement body, and furthermore, a driving body is provided in the outer region of the tube. , an axial guide body is disposed, and the screw nut cylinder is engaged with the guide body so as to be non-rotatable and slidable in the axial direction; and further, a thermopressure medium is supplied to the elastic molded body. and a discharge pipe inserted into the tube.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 to 9. In the present invention, an upper mold element,
The configurations of the lower mold element, vertical loader, upper ring body, lower ring body, lifting device, elastic molded body, etc. are the same as those of the above-mentioned practical machine, so common parts are indicated by common symbols, and the details of the improvements will be described below. Describe.

A cylinder tube 14 is fitted into the fixed guide cylinder 13 via bushings or packings 28 and 29 arranged above and below so as to be able to move up and down, and a driving body and a transmission body are provided at the bottom of the tube 14.

In this example, the drive body 30 is a forward/reverse motor with a brake, and is provided as a side area of the tube 14 on a transmission body case 31 of a middle structure connected to the lower part of the cylinder tube 14.

A transmission body 32 is provided in a transmission body case 31, and in this example, a drive gear 33 is fixedly installed on the shaft of a drive body 30, and a reduction gear 34 meshes with the drive gear 33.
The core of the reduction gear 34 is the tube 1.
A screw screw shaft 35 is inserted on the core of the tube 14 and is connected to the core of the reduction gear 34 by a key or a spline.

Note that the transmission body 32 may be either a helical gear or a spur gear, but preferably a helical gear is used, and in some cases it may be a wrapped body such as a chain.

The screw groove 3 is in the screw screw shaft 35.
5A, a large number of balls 36 are arranged in a row so that they can freely roll, and a ball receiving nut cylinder 37 is provided, and the forward and reverse driving of the screw shaft 35 is transmitted to the ball receiving nut cylinder 37 via the balls 36. It is like that.

A sliding bush 38 is fitted into the ball receiving nut cylindrical body 37 so as to accompany it in the rotating direction, and this bush 38 is fitted into the tube 14, and the connecting rod 17 is connected to the bush 38. The connecting rod 17 has a cylindrical structure, and the core of the connecting rod 17 matches the core of the screw shaft 35.

When the sliding bush 38 engages with a spline or key formed on the inner surface of the tube 14 in the longitudinal direction of the tube, it constitutes a means for converting rotational motion into linear motion, and in this embodiment, it is shown in FIG. In this way, radial notches 38A are formed in the sliding bush 38 at line-symmetrical positions, and the heating medium supply pipe 40 and discharge pipe 41 are inserted through each of the notches 38A to form an engaging part in the rotational direction. This constitutes a means for converting the rotary moving body consisting of the nut cylinder 37, bush 38, etc. into relative vertical linear motion.

The supply pipe 40 and the discharge pipe 41 are each provided inside the tube 14 and along the longitudinal direction of the tube, and their upper ends are substantially joined to the lower ring body 22 side with a screw structure or the like, and are connected to the lower ring body 22. 40A of drilled radial discharge ports;
They are respectively communicated with the recovery port 41A.

The lower ends of the supply pipe 40 and the discharge pipe 41 are connected to the tube 1 slightly above the transmission case 31.
4, which extends outwardly to its mouth, through which a thermopressure medium, ie, steam, gas, etc., can be conducted through a connector (not shown).

Note that the above-mentioned vertical linear motion converting means is the bush 3.
8 can also be configured by engaging the tube 14 with a key or spline, but in this case, the pipe 4
0,41 can be a so-called flexible material. However, if the supply pipe 40 and the discharge pipe 41 are made of metal or the like, at least one of them and the notch 38
Means A is preferable from the viewpoint of simplifying the structure.

Here, the vertical linear motion converting means of the screw rotating body is a guide disposed in the tube 14 in the axial direction (a key, a keyway or a spline formed in the tube 14, or a pipe 40, 41 shown in the figure).
etc.), the screw nut cylindrical body 33 is non-rotatably and slidably engaged in the axial direction.

In addition, in the figure, 42 indicates a sealing means using a gland packing, and 43 indicates a pulse generator, which is connected to the motor shaft via a coupling ring, and which is a position detecting means for the relative vertical linear movement stroke of the upper ring body 18. This is an example. As the position detecting means, other appropriate means such as a limit switch, a proximity switch, a phototube, etc. can be employed.

Next, one cycle of vulcanization molding of the green tire T will be described in detail with reference mainly to FIGS. 1 to 8.

In FIG. 1, the tire inner surface molded body 11 shown as a bladder is in an expanded state, and in this state, the bead portion of the green tire T is gripped by a vertical loader (in the figure, a part of which is shown as a freely expandable blade 1). This shows the loading state.

After this loading state, a so-called shaping process begins, in which the elastic molded body 11
For example, 2 to 3 kg/
This is done by supplying a heat medium of cm ² , that is, steam pressure, gas pressure, etc., and starting the motor 30 in normal rotation.

The starting force of the motor 30 is transmitted to the screw screw shaft 35 through the transmission body 32, and the screw shaft 35 is screwed into a rotating body consisting of a ball 36, a nut cylinder 37, and a bush 38. On the other hand, the supply pipe 40 and the discharge pipe 41 are connected to the notch 38A of the rotary body, in this example, the slide bush 38.
is inserted through the bushing 38 and engaged in the rotational direction, so that the rotational movement is converted into a linear movement direction, and the upper ring body 18 is connected to the bushing 38 via the connecting rod 17.
is attached, the upper ring body 18 descends as shown in FIGS. 2 and 3, and the pressure medium is supplied into the elastic molded body 11 through the supply pipe 40. The green tire T expands sequentially from the lower region to the upper region and is brought into close contact with the inner surface of the green tire T, where shaping is performed.

This shaping stroke can be adjusted according to the size of the tire by providing a position detector such as a limit switch, proximity switch, auto switch, etc. or a pulse generator 43 in this example at a location that involves relative movement and interlocking it with a control computer etc. It is extremely easy to deal with and allows for centralized control.

In addition, the rotationally moving body consisting of the screw screw shaft 35, the ball 36, the nut cylinder 37, etc. is particularly efficiently transmitted by the rotation and revolution of the balls.

During the period from the start of shaping shown in FIG. 2 to the end of shaping shown in FIG. Since the vertical distance from the upper ring body 18 gradually increases, this improves the lowering accuracy of the connecting rod 17, which in turn improves the steadying accuracy of the upper ring body 18 and supports it with the tube 13. Perfect shaping is guaranteed, a so-called gland packing can be used as the movable packing 42, leakage of pressure medium in the elastic molded body 11 can be completely prevented, and the life of the packing 42 can be extended. .

The above-mentioned position detection means detects the shaping stroke, and when the shaping is completed as shown in Fig. 3, the motor 30 and the brake are activated in conjunction with this.
After turning off and retracting the loader 1, the upper mold element 6 is clamped as shown in FIG.

During this mold clamping, the upper ring body 18 will move downward by that stroke, but the screw screw shaft 35 will rotate in the opposite direction due to this, and this will cause an abnormal load on the motor 30.
This can be suppressed as much as possible by making the balls 36 roll smoothly.

After this mold clamping is completed, as shown in FIG.
As before, the voltage is boosted and supplied via
A heat source is supplied to the upper and lower mold elements 2 and 6 to vulcanize and mold the green tire T from the inside and outside.

In this vulcanization molding and the above-mentioned shaping, the heat medium supplied from the supply pipe 40 has little direct contact with the outside air because the pipe 40 is provided inside the tube 13, thereby suppressing heat dissipation and contributing to energy saving. At the same time, since a screw screw type mechanical source is used as the driving source for raising the upper ring body 18 without using fluid pressure, the heat balance of the upper and lower mold elements 2 and 6 as a whole is equalized, and vulcanization can be performed quickly and accurately. It can be molded.

After the completion of vulcanization, after the upper mold element 6 is opened as shown in FIG. 5, the lifting device 23 is opened as shown in FIG.
is activated to elevate the entire central mechanism 10, and the thermopressure medium in the molded body 11 is drained via the discharge pipe 41.

After completing this so-called knockout process, the upper ring body 18 is started by starting the motor 30 in reverse.
is stretched and removed from the molded tire.
The upward stroke of the upper ring body 18 can be controlled by the generator 43 described above.

After the elastic molded body 11 is completely removed from the molded tire, the molded tire T1 is unloaded via the removal member 44, and the lifting device 23 is returned to its original position as shown in FIG. When the lower ring body 22 is lowered, one cycle ends here.

In addition, in the illustrated example above, a bladder is attached between the upper ring body and the lower ring body as an elastic molded body, but the molded body may be a so-called donut-shaped rubber bag or the entire rubber bag structure. can use things. Furthermore, by increasing the lead angle of the screw shaft as the screw rotating body, the ball can be omitted.

In summary, according to the present invention, since the driving device of the central mechanism in the tire vulcanizer is a so-called screw rotating body consisting of a screw screw shaft and a nut cylinder into which this shaft is screwed, transmission can be carried out efficiently and the driving source thereof can be Since a fluid is not used as a fluid, there is no excessive heat loss in the lower ring body in the example, and the heat loss in the upper and lower ring bodies is equalized.
The entire shaping and vulcanization process is uniform, and vulcanization can be completed in a short time, which can save energy.

In addition, the pipes for supplying and discharging the thermopressure medium to the elastic molded body are located inside the tube, eliminating direct contact with the outside air, so there is little heat dissipation within the tube, which also contributes to energy savings. In addition, there is an advantage that bending and breakage of supply and discharge pipes can be effectively prevented, and moreover, it can be designed compactly.

In addition, leakage of the pressure medium supplied to the elastic molded body during shaping and vulcanization can be prevented even at the connections of the supply and discharge pipes without the use of complicated packings made of specific materials. Since this can be done in one place and a gland packing can be used, the sealing performance is outstanding.

Furthermore, since the connecting rod that expands and contracts the elastic molded body can be configured to slide and guide linearly with respect to the tube, and the rotating body can freely move vertically and linearly with respect to the tube, the connecting rod can extend and expand the elastic molding. The accuracy of keeping the body steady is improved, and the radial capacity and vertical capacity of the sliding guide part are also increased as a result, and the shaping and vulcanization accuracy can be greatly improved.

In addition, since the driving body that transmits the starting force to the screw rotating body inside the tube is installed on the outside of the tube, it can be made more compact in the height direction, although there is an unbalanced load compared to the one installed at the lower end of the tube. .

Finally, the shaping stroke etc. can be easily adjusted according to the tire size, the stacking height etc. can be centrally controlled, and since no fluid is used as a drive source, it can be easily adjusted. This eliminates the need for additional piping, which is particularly effective in terms of maintenance.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, and include FIGS. 1 to 8.
The figure is a schematic elevation cross-sectional view showing one cycle of vulcanization, Figure 9 is a cross-sectional view taken along the line A--A in Figure 1, and Figures 10 and 11 are elevation cross-sections showing part of the operation of the conventional example. It is a diagram. 2... Lower die element, 6... Upper die element, 10... Center mechanism, 11... Elastic molded body, 13... Fixed guide cylinder, 14... Tube, 30... Drive body, 3
2... Transmission body, 35... Screw screw shaft, 36
... Ball, 37 ... Nut cylinder, 38 ... Slide bush, 40 ... Supply pipe, 41 ... Discharge pipe.

Claims (1)

[Claims] 1. An upper mold element and a lower mold element that can be opened and closed mutually, and an elastic molded body that can expand and contract the inner surface shape of a green tire inserted into the upper and lower mold elements is sealed therein. In a tire vulcanizer that shapes and vulcanizes tires using a hot-pressure medium, a tube whose upper end is attached to a lower ring body whose upper end is an elastic molded body is movable up and down on a guide cylinder installed vertically on the stationary side. inserted into the tube,
A screw rotating body consisting of a screw screw shaft and a screw nut cylinder to which this screw shaft is screwed is built in, and the screw nut cylinder in the screw rotating body is connected to the elastic molded body through a link. A driving body connected to the upper ring body and transmitting a starting force to the screw rotating body is provided in an outer region of the tube, and an axial guide body is disposed within the tube to The screw nut cylindrical body is engaged with the guide body so as to be non-rotatable and slidable in the axial direction, and further, a pipe for supplying and discharging a thermopressure medium to the elastic molded body is inserted into the tube. The central mechanism of a tire vulcanizer is characterized by: