JPS626964B2 - - 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 a tire vulcanizer, a central mechanism called a bug adjustment device is used to perform shaping and other molding operations on green tires. Its advantage as a practical machine is currently recognized in the industry.

That is, with reference to FIGS. 11 and 12, the structure and behavior of the central mechanism of a tire vulcanizer currently in practical use will be outlined.

Fig. 11 shows the green tire T being loaded using the vertical loader 1 and is in a position to start shaping, and Fig. 12 shows the mold being clamped and vulcanizing after the shaping is completed, where 2 is the fixed lower mold element. It is constructed by providing a lower mold 5 on a lower platen 4 that has a built-in heating source 3. Reference numeral 6 denotes a movable upper mold element, which is constructed by providing an upper mold 9 on an upper platen 8 having a built-in heating source 7. The upper mold element 6 can be tilted or moved up and down with respect to the fixed lower mold element 2, and the mold can be clamped and opened, and the lower mold 5 and the upper mold 9 are aligned and shaped when the mold is clamped as shown in FIG. A mold is formed to form the outer shape of the green tire T, and a heated 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 a bladder such as a rubber bag that can be expanded and contracted, that is, a molded inner surface of the tire 11 is provided on the upper part of the central mechanism. 2 to 3 kg/cm ² of pressure medium such as steam can be supplied radially from the lower region of the molded body, and during vulcanization, the pressure medium can be supplied at a rate of about 21 kg/cm ² (at a temperature of 180°C). ), and after vulcanization, the pressure medium is passed through a drain pipe (not shown) to the molded body 1.
It is possible to discharge from 1.

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. 11 and 12, 23 is a lifting device, and the central mechanism 10
The whole can be raised and lowered by the guide of the 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 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 molded body 11, the molded body 11 is expanded sequentially from the lower side of the green tire T. A so-called shaping operation is performed to bring the upper ring body 18 into close contact with the stopper 21, and the shaping ends at the position where the upper ring body 18 comes into contact with the upper end of the stopper 21. During this process, the connecting rod 17 slides inside the stopper 21, and the shaping operation is performed. Pressure medium leakage inside body 11 is caused by sealing material 26A.
This is prevented by

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. 12, the green tire T is vulcanized by heating the upper and lower mold elements 2 and 6 and increasing the pressure of the pressurized 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 removing the molded body 11 from the vulcanized tire by extending it by lowering step 2, and unloading the vulcanized tire.

As is already clear, the practical machines shown in Figures 11 and 12 have advantages in that they have a simple structure, can be designed compactly, and have low manufacturing costs, but the following points have been improved: It would be even more useful if possible.

That is, in order to supply pressure medium to the inside of the molded body 11 and prevent its leakage, sealing materials 26,
Since 26A is used, leakage prevention can be achieved to some extent, but due to the lack of structural space, a complete sealing material cannot be used, 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.

As outlined above, although the central mechanism currently in practical use has its advantages, it still has some problems because it uses fluid as its driving source.

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 with a fluid as a driving device in the central mechanism of a tire vulcanizer, and developed a screw rotating body using a so-called ball screw nut and the movement of this rotating body into relative vertical linear motion. By converting it, we can ensure the superiority of the above-mentioned practical machine and further ensure the sealing performance and heat balance, and in addition, we can effectively alleviate and absorb the overload during mold clamping. The aim is to improve as much as possible.

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 the inner surface shape of the green tire charged in the mold element is molded into an elastic molded body that can be expanded and contracted. In a tire vulcanizer that shapes and vulcanizes via an enclosed thermopressure medium, the expansion/contraction driving device for the molded body is fitted into the guide cylinder on the fixed side so as to be able to move up and down, and the upper end side is connected to the elastic molded body. It consists of a tube attached to the lower ring body, a screw screw shaft inserted into the tube, and a screw nut cylindrical body to which the screw screw shaft is screwed together via a freely rolling ball. A rotary body is attached to the upper ring body of the elastic molded body through a rod, and a nut is attached to an axial guide disposed within the tube to convert the motion of the rotary body into a relative vertical linear motion. vertical linear motion converting means that engages the cylindrical body in a manner that is relatively non-rotatable and slidable in the axial direction; The present invention provides a central mechanism of a tire vulcanizer characterized by being provided with a fluid shock absorbing device for buffering the tightening load.

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,
Since the lower mold element, vertical loader, upper ring body, lower ring body, lifting device, molded body, etc. have the same configuration as the above-mentioned practical machine, common parts are designated by common symbols, and improvements will be described in detail below.

As shown in FIG. 10, a cylinder tube 14 is fitted into the fixed guide cylinder 13 so as to be able to rise and fall freely through bushes 28 and 29 arranged above and below, and the tube 14 is implemented as a linear guide in the longitudinal direction. In the example, the key 30 is fixed. Note that this key 30 may be replaced by a spline.

In any case, an axial guide (key 30 or spline, keyway) is provided within the tube 14,
By engaging a nut cylindrical body, which will be described later, to this axial guide in a manner that is non-rotatable and slidable in the axial direction,
Any material may be used as long as it constitutes the vertical linear motion converting means.

A driving body and a transmission body are provided at the lower part of the tube 14, and in the embodiment, a transmission body case 31 with a middle structure is used.
is fixed to the lower part of the tube, and a forward/reverse rotation motor 32 with a brake is provided on the projecting part of the transmission case 31, and in the embodiment, a reduction gear transmission 34 is connected to the motor shaft via a coupling 33. are doing.

Note that the transmission body 34 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.

In the embodiment, a screw screw shaft 35 is provided on the reduction gear of the transmission body 34 so as to be rotatable therewith using a spline or a key, and the screw shaft 35 extends upwardly on the cylindrical center of the tube 14 .

The upper part of the screw shaft 35 is connected to the screw shaft 3 as shown in FIG.
A large number of balls 36 are arranged in rows in a rotatable manner in the screw groove 5, and a ball receiving nut 37 is provided.
Here, forward and reverse driving of the screw shaft 35 can be transmitted to the nut 37 via the ball 36, and by engaging the bush 38 as the nut holder with the key 30, the bush 38 can be moved up and down in the tube 14. Converting it into exercise.

As shown in particular detail in FIG. 9, the slide bush 38
A cylindrical connector 39 is fixed with bolts to the connector 39, and a hollow connecting rod 17 is connected concentrically with the tube 14, and an upper ring body 18 is attached to the upper part of the connecting rod 17 as shown in FIGS. It is installed as shown in the figure.

Furthermore, a cylindrical bearing body 4 is provided at the upper end of the tube 14.
0 is fitted as shown in FIG. A large number of gland packings 42 can be interposed between the two to completely prevent leakage of the thermopressure medium (steam, gas) from the molded body 11, and 43 is the packing restraint.

Furthermore, a lower ring body 22 is provided at the upper part of the tube 14 in the same manner as before, and a pressure medium for shaping, that is, a thermopressure medium such as steam or gas is conducted to the ring body 22 through the pipe 12, and a discharge port 12 is connected to the ring body 22.
A can be ejected radially into the molded body 11 through the pipe 12, and a sealing device 44 is provided at the connecting portion of the pipe 12. In addition, the drain port and drain pipe for the thermopressure medium are provided as before.
Further, in the figures, especially in FIG. 9, 45 indicates a lubricating means, and in FIGS. 1 to 8, 46 indicates a safety clutch.

Further, instead of the safety clutch 46, a pulse generator 47 is provided on the motor shaft as shown in FIG. 10 as a position detecting means for the relative vertical linear movement stroke of the upper ring body 18. In addition, suitable position detecting means such as a limit switch, a proximity switch, a phototube, etc. can be employed, and the embodiments shown in FIGS. 1 to 8 employ the latter although not shown.

Furthermore, in FIGS. 1 to 8, the screw screw shaft 35 is inserted through a boss or bearing portion of the transmission body 34 via a spline or key so as to be freely slidable in the axial direction, and is inserted through a thrust bearing 48 and a rod 49. The cylinder 5 is connected to the bottom of the tube 14.
A piston 50 that fits into the mold element 1 is provided, and the cylinder 51 and the piston 50 constitute a fluid shock absorbing device 52 that buffers the mold clamping load of the mold elements 2 and 6.

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 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 and loaded by a vertical loader (in the figure, a part of which is shown as a freely expandable blade 1). This shows the state in which the

After this loading state, a so-called shaping process is carried out, in which a heat medium of, for example, 2 to 3 kg/cm ² , that is, vapor pressure and gas pressure, is supplied into the molded body 11, and the motor 32 This is done by starting the normal rotation.

The starting force of the motor 32 is transmitted to the screw screw shaft 35 through the transmission body 34, and a ball screw nut assembly is provided between the screw shaft 35 and the tube 14, and this assembly is connected to the tube. 14, the rotation of the screw shaft 35 is converted into a linear motion of the assembly, and the upper ring body 18 is attached to the assembly via the connecting rod 17. , Figure 2,
As shown in FIG. 3, the upper ring body 18 descends and the pressurized medium is supplied into the molded body 11, and the molded body 11 sequentially expands from the lower region to the upper region, thereby creating a green tire. It is closely attached to the inner surface of the T, and shaping is done here.

This shaping stroke can be handled very easily depending on the size of the tire by installing position detectors such as limit switches, proximity switches, auto switches, etc. at locations that involve relative movement, and by linking them to a control computer, etc. This also enables centralized control.

In addition, the rotating body consisting of the screw screw shaft 35, the ball 36, the screw nut 37, etc.
As the ball 36 rotates and revolves,
Power is transmitted extremely efficiently.

From the start of shaping as shown in FIG. 2 to the end of shaping as shown in FIG. 3, the distance between the bearing body 40 including the bushing 41 and the assembly, essentially the slide bushing 38, increases sequentially. The lowering accuracy of the rod 17 is improved, which in turn improves the steadiness of the upper ring body 18, ensuring perfect shaping, and a so-called ground packing can be used as the movable packing 42, which allows molding. Leakage of pressure medium within the 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 32 and the brake are turned off and the loader 1 is moved backward, and then the upper The element 6 is mold-clamped as shown in FIG. 4, but the upper ring body 18 is
will move downward, and as a result, the screw screw shaft 35 will rotate in the opposite direction, which in turn will cause an abnormal load on the motor 32. At this time, however, the ball 36 will smoothly roll, thereby reducing the abnormal load on the motor 32. can be suppressed as much as possible.

Due to the mold clamping stroke, the screw shaft 35 moves exclusively downward in the thrust direction via the spline, etc. At the same time, the piston 50 descends and the fluid in the cylinder 51 (hydraulic and water pressure ), the so-called shock absorber function absorbs and alleviates the impact caused by mold clamping.

After this mold clamping is completed, as shown in FIG. 4, a thermopressure medium is pressurized and supplied into the molded body 11 as in the conventional method, and a heat source is supplied to the upper and lower mold elements 2 and 6 to form a green tire T. Vulcanized from the inside and outside.

After the completion of vulcanization, after opening the upper mold element 6 as shown in FIG. 5, the lifting device 23 is operated as shown in FIG. Drain the pressure medium.

After this knockout step is completed, the motor 32 is started in reverse to raise the upper ring body 18 as shown in FIG. 7, and the molded body 11 is stretched and taken out from the molded tire. 18 is the position detector 47 mentioned above.
It can be controlled by

After the molded body 11 is completely removed from the molded tire, the molded tire is unloaded via an unillustrated post inflator, etc., and the lower part is moved through the return movement of the lifting device 23 as shown in FIG. If the ring body 22 is lowered, 1 will be here.
The cycle ends.

Although the above is a basic embodiment of the present invention, the present invention can also be configured as shown in FIG.

That is, in FIG. 10, a connecting rod 17 is integrally formed on the upper part of a screw screw shaft 35 inserted into the tube 14, and a ball nut assembly A is provided at the bottom of the shaft so as not to be vertically movable, and the screw shaft 35 is inserted through this. At the same time, a sliding key 30 is provided on the screw shaft 35 and engaged with the keyway of the tube 14. That is, whereas in the above-mentioned example, the ball nut assembly A moves vertically in a straight line, in the embodiment shown in FIG. 10, the screw shaft 35 is configured to move vertically in a straight line.

Furthermore, in FIG. 10, a motor mounting bracket 53 is provided on the fixed side, to which a forward/reverse rotation motor 32 with a brake as a driving body is fixed, and a worm pinion first transmission body 54 is interlocked and connected to the motor shaft. Further, a spline shaft 56 is provided in the vertical direction on the mounting bracket 53 via a pair of upper and lower bearing bodies 55, and a bevel gear 56A is fixed to the lower part of the spline shaft 56 to interlock with the first transmission body 54. , a relay bevel gear shaft 57 is fitted in the middle of the spline shaft 56 so as to be slidable in the axial direction, and the bevel gear 57 is supported via the overhang arm 14A on the tube 14 side.
is a reduction bevel gear 5 surrounding the nut assembly A.
8 and the relay bevel gear 57 are connected to the bevel gear shaft 59.
It is linked and linked.

Therefore, in the embodiment shown in FIG. 10, the ball screw nut assembly A is rotated in the forward and reverse directions by the forward and reverse rotation of the motor 32 serving as the driving body, so that the screw shaft 35 is moved up and down via a linear guide means such as a key. The connecting rod 17 is moved up and down, and the upper link body 18 is moved up and down within a predetermined stroke range, thereby expanding and contracting the molded body 11.

Furthermore, when the upper mold element 6 is released and the entire center mechanism 10 is knocked out after vulcanization molding of the green tire T, the entire center mechanism 10 is raised and lowered via the spline shaft 56, and the motor 32 etc. are not moved. This will allow you to move more easily.

In summary, according to the present invention, since the drive device of the central mechanism in the tire vulcanizer is a so-called screw rotating body consisting of a screw screw shaft and a ball screw nut, it is possible to efficiently transmit power, and
Since fluid is not used as the driving source, 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, making shaping and vulcanization uniform throughout, and moreover, It can be vulcanized in a short time and can save energy.

In addition, to prevent the leakage of the pressure medium supplied to the molded body during shaping and vulcanization, for example, a gland packing can be used, and the leakage prevention can be perfected.
The sealing performance is excellent because only one place is needed as a seal for the moving parts.

Furthermore, since the connecting rod that expands and contracts the molded body can be configured to be directly slidingly guided to the so-called tube, the steadying accuracy is improved, and the capacity of the sliding guide part is increased, which further increases the accuracy. improves.

In addition, since a fluid shock absorbing device is provided to reduce and absorb the mold clamping load, there is no undesirable impact on the screw screw shaft, the transmission body, and the drive body, and their durability can be improved.

Finally, the shaping stroke etc. can be easily adjusted according to the tire size, maintenance is particularly easy as no piping is required, and stacking height etc. can be centrally controlled. There are advantages such as being possible.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, and include FIGS. 1 to 8.
The figure is a schematic elevational sectional view showing one cycle of vulcanization according to the first embodiment, FIG. 9 is an enlarged view of the main parts showing details of the screw screw shaft and ball screw nut assembly, and FIG. 10 is the main part of the main part. A schematic elevational sectional view of the second embodiment of the invention, and FIGS. 11 and 12 are elevational sectional views showing a part of the operation of the conventional example. 2... Lower die element, 6... Upper die element, 11... Molded body, 13... Fixed guide cylinder, 14... Tube, 32... Drive body, 30... Key (linear motion conversion means), 35... Screw screw shaft, 36...
Ball, 37...nut assembly.

Claims (1)

[Scope of 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 and the heat sealed therein can be used to change the inner surface shape of a green tire charged into the mold elements. In a tire vulcanizer that shapes and vulcanizes tires using a pressure medium, a tube whose upper end is attached to a lower ring body whose upper end is an elastic molded body is fitted in a vertically oriented guide cylinder on the fixed side so as to be able to move up and down. A rotary body consisting of a screw screw shaft and a screw nut cylinder to which the screw shaft is screwed together via a freely rolling ball is built into the tube, and the rotary body The upper end side is connected to the upper ring body of the elastic molded body through a connecting rod, and in order to convert the rotation of the rotary body into vertical linear motion, a nut is attached to an axial guide disposed within the tube. A vertical linear motion converting means is provided which engages the tube in a manner that is non-rotatable and slidable in the axial direction, and a transmission case is attached to the lower end of the tube, and a transmission body built in the transmission case is provided. A driving body is interlocked and connected to the lower end of the rotating body, and a driving body is provided on the side of the tube to drive the transmission body, and further, a fluid shock absorbing device is provided at the lower end of the tube to buffer the clamping load of the mold element. The central mechanism of a tire vulcanizer is characterized by the provision of.