JPH0626813B2 - Tire unloader for tire vulcanizer - Google Patents

Description

TECHNICAL FIELD The present invention relates to a tire unloading device of a tire vulcanizer used for vulcanization molding of automobile tires.

(Prior Art) As a tire unloading device of a tire vulcanizer for use in vulcanization molding of automobile tires, a ram cylinder and a hollow drive shaft are mounted on the center line of an annular lower mold fixed on a lower platen. Each of them is vertically movable and concentrically mounted. A ball nose is detachably fixed to the lower end of the ram cylinder, and a tubular frame is detachably fixed to the lower end of the hollow drive shaft. The upper bead ring and the radial direction are attached to the lower end of the tubular frame. It is known that a plurality of chuck plates for advancing and retracting are attached, and a donut-shaped upper die is fixed to the lower end of an upper frame supporting the hollow drive shaft via a donut-shaped upper platen ( See, for example, Japanese Patent Laid-Open No. 61-160210).

In such a type of tire vulcanizer, the ball nose is attached to the ram cylinder and the tubular frame is attached to the hollow drive shaft by the bayonet mechanism. That is, when mounting the ball nose, a hole is formed in the upper end of the ball nose to which a downward projection of the ram cylinder lower end is fitted, and a plurality of tooth shapes are formed on the inner circumference of the hole and the outer circumference of the projection so as to engage with each other. Is pushed deeply to the position where the tooth profile exceeds the tooth profile of the ram cylinder, then rotated to engage both tooth profiles, and the set screw stops the rotation. Further, in mounting the tubular frame, a plurality of tooth shapes are formed on the inner surface of the tubular frame and the outer surface of the hollow drive shaft so as to mesh with each other, and these teeth are similarly engaged with each other, and rotation is stopped by a set screw.

(Problems to be Solved by the Invention) In the tire vulcanizer described above, it is necessary to replace the mold every time the lot is changed. However, the donut-shaped upper mold has the same shape as the donut-shaped upper platen. In order to replace the mold, the hollow drive shaft penetrates the center hole of the upper mold and upper platen, and the upper bead ring is fixed to the tubular frame. Prior to that, the ball nose must be removed from the ram cylinder and the tubular frame from the central drive shaft. However, in the past, since the ball nose and the tubular frame were attached by the bayonet connection as described above, when the mold is opened, the set screw of the ball nose is loosened, and the ball nose is turned. Remove,
Further, loosen the set screw of the tubular frame, rotate the tubular frame to remove it, lower the upper mold together with the upper platen, and then remove the mold from the upper platen. Since all of the mounting work is done manually and the parts to be removed are large and heavy, the above-mentioned work of removing and mounting requires a lot of labor and is dangerous.

The present invention provides a tire mounting device for a tire vulcanizer in which the ball nose and the tubular frame can be attached and detached easily and safely by mechanical force.

(Means for Solving Problems) A ram cylinder 16 is vertically movable and concentric with respect to a hollow drive shaft 11 which is vertically movable along a center line of an annular lower mold 2 fixed on a lower platen 1. Of the ram cylinder 16, a ball nose 30 at the lower end of the ram cylinder 16, and the hollow drive shaft 11
In the tire unloading device of the tire vulcanizer, the tubular frames 40 are detachably fixed to the lower ends of the respective ones, and a plurality of check plates 41 that move forward and backward in the radial direction are attached to the lower ends of the tubular frames 40. A conical surface 20a is formed on the outer periphery of the lower end of the ram 16, while the upper end of a cylindrical portion 33 having the same outer diameter as the ram cylinder 16 connected to the upper end of the ball nose 30 is connected to the lower conical surface 20 of the ram cylinder 16.
The tapered surface 33a is formed in a taper hole 33b that matches a, and the conical surface 20a and the tapered hole 33b are fitted between the lower end of the ram cylinder 16 and the upper end of the ball nose 30 so that the ram cylinder 16 and the ball nose 30 are The ball lock joints 27 and 28 which are connected to each other and can be locked in the connected state are provided. When the pin 39 is inserted into the tip end hole 32a of the ball nose 30 from below, the ball lock joints are inserted. A ball lock release rod 36 for releasing the locked state of the intos 27, 28 is vertically slidably mounted, and the outer surface of the upper half portion of the tubular frame 40 can be detachably fitted to the lower end of the hollow drive shaft 11. The cylindrical frame 50 is integrally provided, and the cylindrical frame 4
0 and the cylindrical block 50 are provided with cotter grooves 40a and 51a which communicate with each other in the radial direction when the two are fitted, and the cotter groove 40a of the cylindrical frame 40 is in contact with the conical surface 20a at the lower end of the ram cylinder 16 in the radial direction. Attach the sliding cotter 47.

(Operation) In FIG. 1, when the hollow drive shaft 11 is lowered with the upper mold 4 being closed with respect to the lower mold 2, the ram cylinder 16 is integrated with the hollow drive shaft 11 as in the conventional case. To descend. The hollow drive shaft 11 is attached to the outer surface of the tubular frame 40.
The cylindrical block 50 at the lower end is fitted to stop the descent of the hollow drive shaft 11, and the cylindrical frame 40 and the cylindrical block 50 are stopped.
Both of the cotter grooves 40a and 51a are arranged in the radial direction and communicate with each other.

When the ram cylinder 16 continues to descend, the ram cylinder 1
6 The conical surface 20a at the lower end contacts the inner end of the cotter 47 and pushes this cotter 47 outward, and the cotter 47 follows the cotter groove and the cylindrical block 40 and the cylindrical frame 50
Go to a position that spans both sides and join them in a braided manner. On the other hand, as the ram cylinder 16 descends, the lower end of the ram cylinder 16 enters the cylindrical portion 33 at the upper end of the ball nose 30, and the lower end of the ram cylinder 16 and the upper end of the ball nose 30 are guided by the ball locking joints 27, 28. Connected and locked. Therefore, when the hollow drive shaft 11 is raised and lowered in this state, the ram cylinder 16 is also raised and lowered at the same time, and the tubular frame 40 and the ball nose 30 connected thereto are integrally raised. , Descend. By raising the ram cylinder 16 with respect to the hollow drive shaft 11, the sliding mechanism of the chuck plate 41 of the tubular frame 40 is connected to the ball nose 30 as in the conventional case. When the cylindrical frame 40 is connected to the hollow drive shaft 11 and the ball nose 30 is connected to the ram cylinder 16 and located above, the pin 39 that can be inserted into the tip hole 32a of the ball nose 30 is inserted in the center of the lower mold 2. When the hollow drive shaft 11 is then lowered by an arbitrary means and the hollow drive shaft 11 is lowered, the ram cylinder 16 is lowered along with this lowering, and at the same time, the cylindrical frame 40 and the ball nose 30 are lowered. And the hollow drive shaft 1
When the ram cylinder 16 continues to descend by itself and reaches the lower end of the descending stroke, the pin 39 standing at the center of the lower mold 2 causes the ram cylinder 16 to descend at the tip hole 32 of the ball nose 30.
At step a, the ball lock release rod 36 is driven to release the lock of the ball lock joints 27 and 28.

Then, when the ram cylinder 16 is raised, the connection between the ram cylinder 16 and the ball nose 30 is broken, and only the ram cylinder 16 rises, leaving the hole nose 30, and the conical surface 20a at the lower end of the ram cylinder 16 appears. Surface 2
0a is in contact with the cotter 47 and moves inward in the radial direction, and the cotter 47 moves from the cylindrical block 50 at the lower end of the hollow drive shaft 11 into the cylindrical frame 40 inside thereof to move the cylindrical block 50 and the cylindrical frame 40. The bond of is released. Then
By raising the hollow drive shaft 11, the ram cylinder 16 also rises, the tubular frame 40 and the chuck plate 41 fixed to the tubular frame 40 are separated from the central drive shaft 11, and the ball nose 30 is removed from the ram. It is separated from the cylinder 16 and left below. That is, the tubular frame 40 and the ball nose 30 are attached and detached only by the raising and lowering operations of the hollow drive shaft 11 and the ram cylinder 16.

(Embodiment) In FIG. 1, a lower mold 2 is fixed on a lower platen 1 on a floor base (not shown), and a lower bead ring 3 is bolted to an inner peripheral portion of the lower mold 2. It is fixed by tightening (not shown). Then, the upper die 4 stacked on the lower die 2 is fixed to the upper frame 13 (see FIG. 3) via an upper platen (not shown), and contacts the inner circumference of the upper die 4. The upper bead ring 5 is fixed to a tubular frame 40 described later.

A nose receiving cylinder 6 having an open upper surface is placed on the lower bead ring 3 via a dish-shaped flange 7 integrally provided at the upper end thereof. The nose receiving cylinder 6 has a bottom plate 6a, and a pipe-shaped projection 6b is provided so as to project upward at the center of the bottom plate 6a. A plurality of guide rods 8 arranged at equal angular intervals are vertically slidably inserted in the dish-shaped flange 7, and each of them is biased upward by a spring 9 so that the upper ends of the plurality of guide rods 8 are urged upward. A donut-shaped support disk 10 fixed to the above is elastically supported above the dish-shaped flange 7.

Hollow drive shaft 11 and ram cylinder 16 located above
The drive mechanism of is shown in FIG. That is, the hollow drive shaft 11 has a pair of left and right arms 12, 12 protruding laterally near the upper end thereof, and the above-mentioned arms are provided at the lower ends of the piston rods 15 of the left and right fluid cylinders 14 fixed to the upper frame 13. 12 are connected, and the hollow drive shaft 11 is moved up and down by driving the pair of left and right fluid cylinders 14. Then, a sliding disc 18 is fitted on an upper portion of a central shaft 17 fixed by penetrating the upper bottom 11a of the hollow drive shaft 11, and an upper end of the ram cylinder 16 is fixed to an outer periphery of the sliding disc 18. The outer surface of the piston 19 fixed to the lower end of the center shaft 17 slidably contacts the inner surface of the ram cylinder 16, and the ram head 20 is fixed to the lower end of the ram cylinder 16. The central axis 17 includes a central fluid passage 17a penetrating along the center line and an annular fluid passage 17b surrounding the central fluid passage 17a,
The annular fluid passages 17b open above the upper bottom 11a and the piston 19, respectively, and when pressure fluid is supplied through the central fluid passage 17a, the ram cylinder 16 descends with respect to the hollow drive shaft 11, When pressure fluid is supplied through the fluid passage 17b, the ram cylinder 16 rises with respect to the hollow drive shaft 11.

As shown in FIG. 1, the ram head 20 has a truncated cone shape, the outer periphery of which is formed as a conical surface 20a, and a conical ball lock case 21 is provided on the lower surface so as to project downward. . Inside the ball lock case 21 (second
(See the drawing), the unlock sleeve 22 is slidably inserted, and is urged downward by the unlock coil spring 23 loaded in the space between the ram head 20 and the ball lock case 21. A plurality of balls 24 loaded in holes near the lower end are supported from the inside.
On the other hand, a lock sleeve 25 is slidably fitted on the outside of the ball lock case 21. The locking sleeve 25 has a circumferential projection 25a on the inner side thereof.
Lock coil spring 2 loaded in a space above 5a
6, the lower surface of the protrusion 25a is brought into contact with the ball 24 to stop sliding.

An assembly 27 of the ball lock case 21, the unlock sleeve 22, the springs 23 and 26, the ball 24 and the lock sleeve 25 constitutes a ram side portion of the ball lock joint, and a ram side assembly of the ball lock joint. The rod-shaped body 28 (see the first part) on the ball nose side which is paired with the solid body 27 is erected upwardly on the upper end of the lower ball nose 30 and fitted into the unlocking sleeve 22 of the ram side assembly 27. It is provided with a circumferential groove 28b into which the leading end portion 28a and the ball 24 are fitted. By inserting the leading end portion 28a into the unlocking sleeve 22 and pushing it against the elastic force of the unlocking spring 23,
The ball 24 is the circumferential groove 2 of the rod 28 on the ball nose side.
8b, the ram side assembly 27 and the rod-shaped body 28 are joined, and when the balls 24 are hidden from the outer surface of the ball lock case 21 due to the fitting of the balls 24, the locking sleeve 25 causes the locking spring 26 to move. The protrusion 25a of the lock sleeve 25 presses the ball 24 from the outside to lock the above-mentioned coupled state.
Then, the locking sleeve 25 is pushed back upward by some means to form a gap on the outside of the ball 24, so that the ball 24 is easily released from the circumferential groove 28b of the rod-shaped body 28, and the above-mentioned locking is released. The ball-nose side rod 28 can be pulled out from the ball lock case 21 of the ram side assembly 27. By this pulling, the unlocking sleeve 22 is pushed back by the elastic force of the unlocking spring 23 to return to the initial state. To do.

The ball nose 30 is formed into a spheroidal shape by detachably connecting the cap 32 to the lower end of the ball nose body 31 by screwing the cap 32. The ball nose 30 is formed at the upper end of the ball nose body 31 with an annular groove 33a through an annular groove 33a. A cylindrical portion 33 having the same outer diameter as that of the cylinder 16 is continuously provided, and a taper hole 33b that matches the conical surface 20a at the lower end of the ram cylinder 16 is formed at the upper end of the cylindrical portion 33, and is located at the center of the bottom portion of the cylindrical portion 33. As described above, the rod-like body 28 which is the ball nose side portion of the ball locking joint is fixed. A cavity 34 is formed at the mating portion of the ball nose body 31 and the cap 32, and a plurality of ball lock release rods 36 are fixed upright near the outer periphery of a disk 35 placed at the bottom of the cavity 34. The ball lock releasing rod 36 penetrates the ball nose body 31 in a vertically slidable manner, and its upper end projects around the rod-shaped body 28 of the ball lock joint and faces the lower surface of the lock sleeve 25. The ball lock release rod 36 is
It is urged downward by a releasing spring 37 mounted above the disc 35. Further, the ball nose cap 32 has a pin hole 32a (third part) through which the pipe-shaped projection 6b of the nose receiving ring 6 can be inserted along the center line thereof.
(See the drawing) is bored so as to communicate with the upper empty space 34, and the ball lock releasing pin 39 mounted so as to extend the pipe-shaped projection 6b upwardly enters the pipe projection 6b and pushes up the disc 35. It is becoming like this.

In FIG. 1, a tubular frame 40 is provided so as to surround the cylindrical body 33 above the ball nose 30.
The tubular frame 40 is formed in a truncated cone shape,
The bead ring 5 of the upper mold 4 is fixed to the lower part of the outer periphery by bolts, and a plurality of chuck plates 41 are attached to the lower surface so as to be slidable in the radial direction. That is, a plurality of cutouts are formed in the lower half of the tubular frame 40, the bearing block 42 is fixed to the upper part of the cutouts, and the sliding block fixed to the bearing block 42 and the upper surface of the chuck plate 41. 43 is two parallel links 44 and 45
Are connected to form a parallel link mechanism. And
A drive lever 46 forming an inverted V shape is integrally formed with the inner link 44 of the two links 44, 45, and the drive lever 46 is biased inward by a spring (not shown). , The tip roller 46 of the drive lever 46
a is in contact with the outer surface of the cylindrical portion 33 above the ball nose 30, and in this state, the tip of the chuck plate 41 projects beyond the bead ring 5 into the upper mold 4, and the ball nose 30 rises to form an annular shape. When the tip roller 46a of the drive lever 46 falls into the groove 33a, the check plate 4
1 slides inward, and the tip of the shutter plate 41 is pulled under the bead ring 5.

Two cotter holes 40 are provided on the upper end side of the tubular frame 40.
A and 40a are bored so as to face each other in the diametrical direction (see FIG. 4), and a cotter 47 is slidably fitted in the cotter hole 40a. This cotter 47 is provided with a roller 48 at its inner end, and when the cotter 47 is urged inward, the roller 48 comes into contact with the ram cylinder 16 and the cylindrical portion 33 above the ball nose 30. I'm running. Reference numeral 49 denotes a cotter spring for urging the arm 47a, which is loaded in spring receivers 40b formed on both sides of the cotter hole 40a of the tubular frame 40 and projects laterally from the inner end of the cotter 47. Press. The upper surface of the cotter 47 has a radial slot 4
7b is provided, and a guide pin 47c protruding downward from the ceiling of the cotter hole 40a is fitted into the groove hole 47b to limit the stroke of the cotter 47.

A cylindrical block 50 (see FIG. 1) for connecting the cylindrical frame 40 to the lower end of the hollow drive shaft 11 is
It is provided integrally with the lower end of the hollow drive shaft 11. The cylindrical block 50 is a flange-shaped one having a conical recess 51 into which the upper half portion of the cylindrical frame 40 can be fitted and which is formed on the lower surface, and the cylindrical frame is provided at a position opposite to the conical recess 51. An annular cotter groove 51a communicating with the outer opening of the cotter hole 40a of 40 is provided.

In the above structure, the hollow drive shaft 11 has a cylindrical frame 4
0, and when connecting the ball nose 30 to the ram cylinder 16, place the nose receiving cylinder 6 to the set of the support disk 10 on the bead ring 3 of the lower mold 2, as shown in FIG. Then, the cylindrical frame 4 is placed on the support disk 10.
0 is mounted, the ball nose 30 is fitted into the nose receiving cylinder 6, and then the hollow drive shaft 11 and the ram cylinder 16 are lowered as described above. In this case, since the roller 48 is attached to the inner end of the cotter 47 of the tubular frame 40, the roller 48 rolls in contact with the conical surface 20a at the lower end of the ram cylinder 16, so that the cotter 47 moves outward smoothly. And then the tubular frame 40 is joined to the tubular block 50 at the lower end of the hollow drive shaft 11, and then the ram cylinder 16
As the ram side assembly 27 of the ball locking joint at the lower end thereof is fitted, the rod-shaped body 28 at the upper end of the ball nose 30 is fitted and connected to each other, whereby the ball nose 30
Are connected to the ram cylinder 16. When the ram cylinder 16 is raised while the hollow drive shaft 11 is stationary, the tip rollers 46a of the drive levers 46 of the parallel links 44 and 45 in the tubular frame 40 are fitted into the annular groove 33a of the ball nose 30. Then, the check plate 41 is retracted to the state shown in FIG.

When the tire is vulcanized and molded, the nose receiving cylinder 6 to the supporting disk 10 of the lower mold 2 are removed, and the green tire and the tire molding bladder are set in the same manner as in the conventional case. When the vulcanization molding is completed, the ram cylinder 16 is lowered while the hollow drive shaft 11 is stationary, the tip roller 46a of the drive lever 46 is removed from the annular groove 33a of the ball nose 30, and the parallel links 44, 45 are removed. The chuck plate 41 is rotated in the opposite direction and inserted from the lower surface of the upper bead ring 5 between the bead of the tire and the molding bladder, and the bead portion of the tire is held between the upper bead ring 5. at the same time,
The lowered ball nose 30 pushes down on the bladder and peels it off from the inside of the tire, causing bagwell (not shown).
Push it in.

In this state, raise the upper frame and open the upper mold,
The tire is pulled out upward from the lower mold. And
When the upper mold is opened to the upper limit and stopped, and then the hollow drive shaft 11 is lowered, the upper bead ring 5 bolted to the tubular frame 40 moves down from the upper mold 4 to lower the tire. Extrude from mold 4. Then, when the ball nose 30 is raised to the upper limit by the ram cylinder 16, the chuck plate 41 retracts from the lower surface of the bead portion of the tire to the lower side of the upper bead ring 5 so that the tire can be removed.

When removing the tubular frame 40 from the hollow drive shaft 11 and the ball nose 30 from the ram cylinder 16,
As shown in FIG. 3, the nose receiving cylinder 6 to the set of the supporting disk 10 are placed on the bead ring of the lower mold 2 again, and the ball lock releasing pin 39 is attached to the pipe-shaped projection 6b of the nose receiving cylinder 6. After that, the hollow drive shaft 11 and the ram cylinder 16 are lowered. When the ball lock release pin 39 and the pipe-shaped projection 6b are inserted into the tip end hole 32a of the ball nose 30, the release pin 39 pushes up the disc 35 inside the ball nose 30, and thereby the ram cylinder 16 via the ball lock release rod 36. The lock sleeve 25 of the ram side assembly 27 at the lower end is pushed up to release the lock. Next, when the ram cylinder 16 is raised, the ram side assembly 27 and the ball nose side rod 2
8 separate. Then, the conical surface 20 of the ram cylinder 16
a escapes from the cylindrical body 33 of the ball nose 30, the tip roller 48 of the cotter 47 rolls along the conical surface 20a, and the cotter 47 retreats toward the center side. The connection with the cylindrical block 50 at the lower end of 11 is cut off, and the hollow drive shaft 11 is separated from the cylindrical block 50.

(Effect of the Invention) According to the present invention, by vertically moving the hollow drive shaft and the ram cylinder, both attachment and detachment of the ball nose with respect to the ram cylinder and attachment and detachment of the tubular frame with respect to the hollow drive shaft are automatically performed. It requires almost no manual work, there is no danger, and it can be removed even when the mold is hot.

[Brief description of drawings]

1 is a vertical sectional view of an embodiment of the present invention, FIG. 2 is a vertical sectional view of a ram side assembly of a ball lock joint, and FIG. 3 is a vertical sectional view of a connected state of the embodiment of FIG. FIG. 4 is a sectional view taken along line IV-IV in FIG. 1: Lower platen, 2: Lower mold, 3, 5: Bead ring, 4: Upper mold, 11: Hollow drive shaft, 16: Ram cylinder, 20a: Conical surface, 27: Ram side assembly of ball lock joint. Solid, 28: Ball nose side rod-shaped body of ball lock joint, 30: Ball nose, 32a: Tip hole, 33: Cylindrical body, 33b: Tapered hole, 36: Ball lock release rod, 39: Ball lock release pin, 40:
Cylindrical frame, 40a, 51a: cotter groove, 47: cotter, 50: tubular block.

Claims (1)

[Claims] 1. A ram cylinder is movably and concentrically provided with respect to a hollow drive shaft which is vertically movable along a center line of an annular lower mold fixed on a lower platen, and is provided at a lower end of the ram cylinder. A tire unloader for a tire vulcanizer in which a ball nose and a tubular frame are detachably fixed to the lower end of the hollow drive shaft, and a plurality of check plates that move forward and backward in the radial direction are attached to the lower end of the tubular frame. In the above, while forming a conical surface on the outer periphery of the lower end of the ram cylinder, a tapered hole in which the upper end of a cylindrical portion having the same outer diameter as the ram cylinder connected to the upper end of the ball nose matches the lower conical surface of the ram cylinder. The ram cylinder and the ball nose are connected by fitting the conical surface and the tapered hole between the lower end of the ram cylinder and the upper end of the ball nose. A ball lock joint that can be locked to the connection state of the ball lock nose is inserted in the ball nose to release the lock state of the ball lock joint when a pin is inserted into the tip hole from below. A ball lock release rod is vertically slidably mounted, and a cylindrical block to which the outer surface of the upper half portion of the cylindrical frame is detachably fitted is integrally provided at the lower end of the hollow drive shaft. The block-shaped block is provided with a cotter groove that communicates in the radial direction when the two are fitted, and a cotter that slides in the radial direction in contact with the conical surface at the lower end of the ram cylinder is attached to the cotter groove of the tubular frame. A tire unloader for a tire vulcanizer.