JP4474004B2 - Detachment device for tire molding drum - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a molding drum attaching / detaching device in a tire molding machine, and more specifically, in a molding drum used in a tire molding system called a single stage, the size of the molding drum is changed, and a bladder on the molding machine main body side. The present invention relates to a tire molding drum attaching / detaching device that can safely and reliably perform a molding drum replacement operation when performing replacement or the like.
[0002]
[Prior art]
In general, a corded rubber sheet called a reinforcing ply in the formation of a radial tire is folded back so as to wrap the bead, and the corded rubber sheet is inflated into a toroidal shape to provide a steel corded belt reinforcement or cap tread. Is a single stage molding method (or unistage), and the drum used at this time is called a single stage molding drum.
[0003]
[Problems to be solved by the invention]
By the way, the molding drum as described above relatively approaches and separates when a bead lock mechanism that grips the tire bead portion from below the inner surface, a mechanism that folds the reinforcing ply while gripping, and further inflating into a toroidal shape. In general, the structure is complicated with a mechanism or the like.
[0004]
For this reason, the structure is complicated, heavy in weight, the driving force to each mechanism, the supply of pressure air, etc. are cumbersome, replacement of parts used and maintenance, and drum replacement when changing the molded tire (bead size) The work is done by opening and fastening multiple bolts and nuts using a lifting device, which takes a lot of work and time, is a major obstacle to productivity, and is a good safety situation. There wasn't.
[0005]
That is, the configuration of a conventional tire molding machine will be briefly described. As shown in FIGS. 11 to 14, the tire molding machine main body 1 grips the molding machine main shaft 2 so as to be rotatable in a cantilever state. In the tire molding machine main body 1, drum blocks 3 a and 3 b that are provided with a spindle rotation driving mechanism and a ply folding mechanism (not shown) and that can grip the bead inner surface from below are arranged in the longitudinal direction of the drum shaft 6. A drive mechanism for rotating the opening and closing shafts 4a and 4b for relatively approaching and separating from each other, and a mechanism for supplying pressure air and the like for driving a bead gripping mechanism and the like via a rotary seal are included.
[0006]
The left and right drum blocks 3a and 3b constituting the forming drum 5 are provided on the drum shaft 6, and one end of the drum shaft 6 is provided with a flange 7 to be connected to the main shaft 2 of the molding machine. It is connected and held detachably by a bolt 8 or the like.
[0007]
Pressure air for driving various mechanisms passes through air holes (not shown) provided in the molding machine main shaft 2 and is supplied to a plurality of air holes 9 on the drum shaft 6 side. From the relationship with the mounting bolt, as shown in FIG. 13, it is supplied to the forming drum 5 through the hose 10 and the connection fitting 11 that are once taken out of the molding machine spindle 2. As a result, the drum replacement operation has a great deal of time with the removal and attachment of the plurality of fixing bolts 8 and the separation and connection of the pressure air.
[0008]
Further, inside the drum shaft 6 of the forming drum 5, open / close shafts 4a and 4b having left and right screws for moving the left and right drum blocks 3a and 3b relatively in the axial direction are rotatably included. The end portion on the 1 side has a flat portion for transmitting a rotational driving force, for example, a quadrangular column 12, and a corner of a rotary shaft (not shown) rotatably mounted inside the molding machine main shaft 2. Engage with the mold recess to enable timely opening / closing drive.
[0009]
Further, as shown in FIG. 14, a plurality of mounting holes 13 for the fixing bolts 8 are formed in the flange 7 of the forming drum 5, and a plurality of pressure air holes 14 are formed therebetween. An implantation key 15 for transmitting the rotational force from the molding machine main shaft 2 without play is formed, and is fitted to a key groove (not shown) on the main shaft 1 side.
[0010]
In the conventional apparatus, when the drum replacement operation is performed due to the above-described configuration, first, the connection fittings 11 of the plurality of air hoses 10 are separated, and the forming drum 5 is replaced with an appropriate lifting device and jig. The plurality of fixing bolts 8 are loosened and then moved to a standby position. Next, after the drum to be newly assembled is moved to the assembly position and the implantation key 15 and the drum opening / closing shafts 4a and 4b are aligned, the plurality of fixing bolts 8 are fixed and the connection fitting 11 is connected to complete the replacement. Become.
[0011]
However, as described above, the drum replacement work takes a long time, impeding productivity, and handling heavy objects for a long time is also disadvantageous in terms of safety. is there.
[0012]
The object of the present invention is to perform the replacement work of the molding drum safely and surely when performing the size exchange of the molding drum or the bladder exchange on the molding machine body side, etc., and more efficiently in a short time. It is possible to provide a tire forming drum attaching / detaching device capable of significantly improving productivity.
[0013]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention abuts a mounting flange formed at the drum shaft end of the molding drum and a mounting flange formed at the shaft end of the hollow molding machine main shaft so as to contact the shaft of the molding machine main shaft. A tire forming drum attaching / detaching device comprising a forming drum configured to be attachable to and detachable from a molding machine main shaft via an attaching / detaching mechanism provided on an end side, wherein the attaching flange formed on the drum shaft end is on the forming drum side The side surface is formed in a substantially conical concave shape toward the drum shaft core side, and the attachment / detachment mechanism provided on the shaft end side of the main spindle of the molding machine includes a plurality of locking claws that engage with the conical concave surface of the mounting flange. A hook arm that can be opened and closed, a divided tapered ring member that is in sliding contact with the outer peripheral surface of the hook arm and that constantly urges the locking claw in the engaging direction, and releasing the locking claw Foot that pulls in the direction It is an Abstract by being configured by the arm of the release means.
[0014]
Further, when a pressure air supply hole is formed along the longitudinal direction inside the drum shaft and the molding machine main shaft and the mounting flange and the mounting flange are brought into contact with each other and connected, the pressure air supply hole is not formed. It is configured to communicate with each other, and the outer peripheral surface of the hook arm and the taper ring member are taper-fitted to perform a one-touch molding drum setup change operation.
[0015]
Furthermore, by forming a protrusion of a predetermined length that fits into the hollow portion of the molding machine main shaft at the drum shaft end, it is possible to effectively prevent the molding drum from dropping off together with the attachment / detachment mechanism.
[0016]
Further, the hook arm releasing means includes a sleeve having a tapered ring member provided at the tip thereof so as to be slidable along the molding machine main shaft, and between the flange provided at the rear end of the sleeve and the molding machine main shaft. An elastic member that normally urges the hook arm in the closing direction is provided at the same time, and a release air cylinder is interposed between the flange and the main body frame of the molding machine, so that the work for changing the molding drum can be changed. Can be done easily in a short time.
[0017]
The present invention is configured as described above, and when performing the exchange of the size of the molding drum or the bladder on the molding machine body side, the replacement operation of the molding drum can be performed safely and reliably, and in a shorter time. It can be performed efficiently and the productivity can be remarkably improved.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[0019]
Note that the same components as those in the conventional example are denoted by the same reference numerals and description thereof is omitted.
[0020]
FIG. 1 is a schematic configuration diagram of an entire tire molding machine embodying the present invention, where 1 is a tire molding machine main body, 2 is a molding machine main shaft held in a cantilevered state by the tire molding machine main body 1, and 3a and 3b are The left and right drum blocks constituting the forming drum 5 are provided on the drum shaft 6.
[0021]
In the embodiment of the present invention, a mounting flange 17 formed at the end of the drum shaft 6 of the forming drum 5 and a mounting flange 2a formed at the shaft end of the hollow molding machine main shaft 2 are brought into contact with each other to form The molding drum 5 is configured to be attachable to and detachable from the molding machine main shaft 2 through an attaching / detaching mechanism 20 provided on the shaft end side of the machine main shaft 2.
[0022]
That is, as the attaching / detaching mechanism 20 on the forming drum 5 side, as shown in FIGS. 2 and 3, the forming drum side side surface 17a of the mounting flange 17 formed at the end of the drum shaft is set to the drum shaft center (X-X line). ) Side conical concave surface.
[0023]
A side surface 17b of the mounting flange 17 formed on the drum shaft end on the molding machine main shaft 2 side is formed in a surface perpendicular to the shaft center, and the thickness of the mounting flange 17 on the molding drum side side surface 17a is the shaft center. It is processed into a so-called tapered shape (mortar shape) so as to become thinner as it approaches (center). This angle is preferably about 1.5 ° to 5 ° with respect to the vertical line.
[0024]
A protrusion 18 having a diameter smaller than the outer diameter of the mounting flange 17 and having a predetermined length L that fits into the hollow portion 2x of the molding machine main shaft 2 is formed at the tip of the drum shaft 6. The part 18 has a so-called spigot shaft part 19 whose tip side is thin and tapered. The longer the length L of the parallel portion of the projecting portion 18 is, the more the risk of dropping can be reduced, and it is desirable that the length L be equal to or greater than the diameter D (L =,> D).
[0025]
On the other hand, the attaching / detaching mechanism 20 provided on the shaft end side of the molding machine main shaft 2 has a plurality of opening / closing mechanisms provided with locking claws 21 that engage with the conical concave surface of the mounting flange 17 as shown in FIGS. A possible hook arm 22, a tapered ring member 23 that is slidably in contact with the inclined outer peripheral surface 22 a of the hook arm 22, and that constantly biases the locking claw 21 in the engagement direction, and the tapered ring member 23 And a releasing means 24 of the hook arm 22 that pulls the lever in the releasing direction.
[0026]
In the embodiment of the present invention, the number of hook arms 22 is four, but the number is not particularly limited. The narrower the hook width, the larger the number, the smoothness of the operation from gripping the round shaft and the mounting flange 17 is good, but about four are preferable in view of the ease of manufacturing the gripping part shape.
[0027]
The base ends of the plurality of hook arms 22 are supported by a metal fitting 26 disposed on the outer peripheral surface of the shaft end of the molding machine main shaft 2 via pins 25 so as to be swingable. It is urged | biased so that it may always turn in the circumferential direction (opening direction) by the coil spring which is not shown in figure provided in.
[0028]
Further, the tapered member 23 divided when the hook arm 22 is pressed is opened on the outer peripheral surface of the divided tapered member 23 that is slidably contacted with the outer peripheral surface 22 a inclined toward the base end side of the hook arm 22. The holding ring member 27 is attached so as not to be removed.
[0029]
The release means 24 of the hook arm 22 is fitted with a sleeve 28 having a tapered ring member 23 and a holding ring member 27 provided at the tip thereof through a metal 28a so as to be slidable along the main shaft 2 of the molding machine. 28 is connected by a sliding key (not shown) so as not to rotate relative to the molding machine main shaft 2.
[0030]
A flange 29 is formed at the rear end of the sleeve 28. A counterbore surface 29a formed on a side surface of the flange 29 and a counterbore surface 30a of a fixing ring 30 attached to the outer peripheral surface of the molding machine main shaft 2. An elastic member 31 such as a compression spring that normally biases the hook arm 22 in the closing direction via the sleeve 28, the taper ring member 23, and the pressing ring member 27 is provided therebetween.
[0031]
A flange 33 is attached to the outer peripheral surface of the flange 29 via a special bearing 32 called a so-called cross roller bearing that can receive a combined load of radial and thrust. A plurality of release air cylinders 34 are interposed between the frame 1 a and an output rod 34 a of the air cylinder 34 is fixed to a side surface of the flange 33.
[0032]
With this structure, the flange 33 does not rotate even when the molding machine spindle 2 and the sleeve 28 rotate, and the sleeve 28 can be moved in the direction of the main body frame 1a by the air cylinder 34, whereby the hook arm 22 can be moved. Can be released.
[0033]
4 and 5 show a side view taken along the line AA and a side view taken along the line BB in FIG. 3, and the drum shaft 6 and the molding machine main shaft 2 have a plurality of air holes 35A for supplying pressure air. 35E and 35a to 35e are provided, and pressure air is supplied as necessary through a so-called rotary seal or the like of an air supply mechanism (not shown).
[0034]
Further, a pin hole for positioning (rotating direction) of the forming drum 5 and rotational torque transmission, or an embedding key 36 is provided. A sealing O-ring (O-ring) 37 is embedded around the air holes 35A to 35E.
[0035]
The shaft center portion of the molding machine main shaft 2 is connected to the end portion 12 of the drum side opening / closing shaft 4b having left and right screws for relatively approaching and separating the drum blocks 3a and 3b of the molding drum 5 for driving. A rotary drive shaft 39 having a recess 38 is rotatably installed. The mounting flange 17 formed at the end of the drum shaft 6 of the molding drum 5 has air holes 35A to 35E corresponding to the air holes 35a to 35e formed on the molding machine main shaft 2 side as described above. A key groove 40 for positioning (embedded type: see FIG. 2) is provided on the side surface 17b of the mounting flange 17 that is formed.
[0036]
Next, a method for attaching and detaching the molding drum of the present invention having the above-described configuration will be described with reference to FIGS.
[0037]
First, FIG. 6 shows the molding machine main body 1 in a state where the molding drum 5 is not attached. The sleeve 28 is moved to the main body frame 1a side by the air cylinder 34 via the special bearing 32 (cross roller bearing). The hook arm 22 for gripping the forming drum 5 is opened, and is in a so-called open state in which it is separated from the spindle rotation center by a torsion spring (not shown).
[0038]
In this state, the molding drum 5 is supported by a suitable lifting device, and the center of the molding machine main shaft 2 and the center of the drum shaft 6 of the molding drum 5 are brought close to each other. At this time, the position of the phase matching key groove 40 and the drum block 3a , 3b, the phase of the end portion 12 of the opening / closing shaft 4b and the concave portion 38 of the rotary drive shaft 39 are moved in advance.
[0039]
After that, as shown in FIG. 7, the molding drum 5 is moved closer, and the spigot shaft portion 19 of the molding drum 5 is fitted to the hollow inner diameter portion 2 x of the molding machine main shaft 2. Further, as shown in FIG. 8, the molding drum 5 is moved (the projection 18 is pushed in), the end 12 and the recess 38 are fitted, and then further moved to fit the embedded key 36 and the key groove 40. .
[0040]
In this state, the sleeve 28 is moved in the direction of the forming drum 5 by the air cylinder 34 and the compression spring 31. At this time, since the taper ring member 23 that includes the slope according to the outer peripheral surface 22a of the hook arm 22 is provided at the tip of the sleeve 28, the elastic force of a torsion spring (not shown) that opens the hook arm 22 is provided. The hook arm 22 is turned around the pin 25 against this.
[0041]
Further, when the sleeve 28 advances, the tapered outer peripheral surface 22a of the hook arm 22 firmly holds the tapered side surface 17a of the mounting flange 17 of the molding drum 5, and draws the molding drum 5 toward the main body frame 1a.
[0042]
As a result, the front surface 2b of the mounting flange 2a and the flange side surface 17b of the mounting flange 17 are firmly in contact with each other, the spindle side air holes 35a to 35e are connected to the drum side air holes 35A to 35E, and the pressure air is supplied from the air hose. Thus, it is possible to supply the forming drum 5 in a timely manner without using any other means, and the mounting of the forming drum 5 is completed.
[0043]
At this time, since the sleeve 28 is always biased toward the drum by the compression spring 31, even if the output of the air cylinder 34 is lost, the sleeve 28 does not fall off during the molding of the tire.
[0044]
Further, the removal operation of the forming drum 5 may be performed by reversing these operations. However, in the unlikely event that the operator supports the forming drum 5 with an appropriate lifting device, the sleeve 28 is moved by the air cylinder 34. Even if the molding drum 5 is retracted, the molding drum 5 is prevented from falling off by the fitting length L of the spigot shaft portion 19, but as shown in FIG. 9, the taper provided on the back surface of the hook arm 22 and the mounting flange 17. The self-locking mechanism is constituted by the positional relationship between the rocking pin 25 and the position where the inner surface of the locking claw 21 is engaged with the side surface 17a, and does not fall off.
[0045]
In addition, in FIG. 9, although fastening force becomes large, so that the distance La with a pressurization point is large, there exists a problem that the outer diameter of an installation mechanism becomes large. Further, the smaller the angle θ of the inclined surface of the hook arm 22, the greater the fastening force.
[0046]
As shown in FIG. 9, even if the urging force of the hook arm 22 disappears, the molding drum 5 does not fall off due to self-locking due to the structure of the conical concave side surface 17a of the mounting flange 17.
[0047]
With the above-described configuration, when the tire is molded, a so-called turn-up operation is performed in which the tire material (ply) wraps the bead portion on the molding drum 5, the bladder 41 is inflated (see FIG. 2), and a pusher (not shown) Although the push-in operation is performed by the apparatus, if the timing of pressing the left and right bladders 41 is shifted, a strong force is sometimes generated in the direction of pulling out from the drum shaft 6 of the drum 5. Since the taper ring 23 is pressed and the self-locking mechanism described above works, it can easily resist this extraction force with a relatively small force.
[0048]
Of course, if the urging force of the sleeve 28 by the output of the compression spring 30 is sufficient, the air cylinder 34 only has to pull back the sleeve 28 and open the hook arm 22, and a mechanically simple special bearing is used. Not cheap.
[0049]
FIG. 10 shows another embodiment in which the forming drum attaching / detaching device in the tire forming machine is simplified, and the flange 29 provided at the rear end of the sleeve 28 and the output rod 34a of the air cylinder 34 are not directly connected. Further, an open ring plate 44 that engages with the flange 29 is provided at the tip of the output rod 34a.
[0050]
Thereby, the sleeve 28 can be pulled back by the air cylinder 34 without using a special bearing, and the hook arm 22 can be opened. Since other configurations and operations are the same as those in the first embodiment, the same reference numerals are given and description thereof is omitted.
[0051]
【The invention's effect】
According to the present invention, the side surface of the mounting flange formed on the drum shaft end as described above is formed in a substantially conical concave shape toward the drum shaft core side, and is provided on the shaft end side of the main shaft of the molding machine. The attachment / detachment mechanism includes a plurality of openable and closable hook arms provided with a locking claw that engages with the conical concave surface of the mounting flange, and a sliding contact with the outer peripheral surface of the hook arm, and the locking claw is always in the engagement direction. Since the divided tapered ring member to be urged and the hook arm releasing means for pulling the tapered ring member in the releasing direction of the locking claw, the following excellent effects are obtained.
(a) In a tire molding machine, the drum detachment time can be greatly shortened when changing the size of the molding drum, the bladder on the molding drum, etc., and the workability and tire productivity can be improved.
(b) The forming drum can be exchanged safely and reliably.
(c) The hook arm outer peripheral surface and the taper ring member are taper-fitted, and the one-touch molding drum can be replaced.
(d) By forming a protrusion of a predetermined length that fits into the hollow portion of the molding machine main shaft at the drum shaft end, it is possible to effectively prevent the molding drum from dropping off together with the attachment / detachment mechanism.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of an entire tire molding machine embodying the present invention.
FIG. 2 is an enlarged front view, partly cut away, on the molding drum side.
FIG. 3 is an enlarged sectional view of a molding drum attaching / detaching device according to the present invention.
4 is a side view taken along the line AA in FIG. 3;
FIG. 5 is a side view taken along the line BB in FIG. 3;
FIG. 6 is an explanatory diagram of a process of attaching and detaching the molding drum, and is an explanatory diagram showing a state where the molding machine main body and the molding drum are separated.
FIG. 7 is an explanatory diagram of a process of attaching and detaching the molding drum, and is an explanatory diagram showing a state where the drum shaft of the molding drum is brought into contact with the main shaft of the molding machine main body.
FIG. 8 is an explanatory diagram of a process for attaching and detaching a forming drum, and is an explanatory diagram showing a state in which a mounting flange of a drum shaft and a mounting flange of a main shaft are clamped by a hook arm.
FIG. 9 is an explanatory view showing the relationship between the mounting flange of the drum shaft of the forming drum and the hooking claw of the hook arm.
FIG. 10 is a schematic configuration diagram of an entire tire molding machine showing another embodiment of the present invention.
FIG. 11 is a schematic configuration diagram of an entire conventional tire molding machine.
FIG. 12 is a partially longitudinal front view showing a configuration of a conventional tire forming drum.
13 is a side view taken along the line CC of FIG.
FIG. 14 is an explanatory view showing a connection structure between a conventional drum shaft and a main shaft of a molding machine.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Tire molding machine main body 2 Molding machine main shaft 3a, 3b Drum block 2x Hollow part 4a, 4b opening / closing axis of molding machine main shaft 5 Molding drum 6 Drum shaft 7 Flange 8 Bolt 9 Air hole 10 Hose 11 Connecting bracket 12 Quadratic pillar 13 Mounting hole 14 Pressure Air Hole 15 Implanting Key 17 Mounting Flange 17a Molding Drum Side Side 17b of Mounting Flange Side 18 of Mounting Flange Main Shaft Side Projection 19 Inlay Shaft 20 Detachment Mechanism 21 Locking Claw 22 Hook Arm 22a Inclined Outer Surface 23 Taper ring member 24 Release means 25 Pin 26 Metal fitting 27 Holding ring member 28 Sleeve 29 Flange 29a Counterbore surface 30 Fixing ring 30a Counterbore surface 31 Elastic member 32 Special bearing 33 Flange 34 Air cylinder 34a Output rods 35A to 35E Over holes 35a~35e air hole 36 embedded key 37 sealing O-ring (O-ring)
38 Concave part 39 Rotation drive shaft 40 Key groove for positioning 41 Left and right bladder 44 Open ring plate

Claims (5)

An attachment flange formed at the drum shaft end of the molding drum and a mounting flange formed at the shaft end of the hollow molding machine main shaft are brought into contact with each other via an attaching / detaching mechanism provided on the shaft end side of the molding machine main shaft. A tire forming drum attaching / detaching device comprising a forming drum configured to be attachable to and detachable from a molding machine main shaft,
The mounting drum side surface of the mounting flange formed at the drum shaft end is formed in a substantially conical concave shape toward the drum shaft core side, and the attaching / detaching mechanism provided on the shaft end side of the main shaft of the molding machine includes the mounting flange A plurality of openable and closable hook arms having a locking claw that engages with the conical concave surface, and a divided taper that is in sliding contact with the outer peripheral surface of the hook arm and constantly biases the locking claw in the engaging direction. A tire molding drum attaching / detaching device comprising a ring member and hook arm releasing means for pulling the tapered ring member in a releasing direction of the locking claw. A pressure air supply hole is formed along the longitudinal direction inside the drum shaft and the main shaft of the molding machine, and the pressure air supply hole communicates when the mounting flange and the mounting flange are brought into contact with each other and connected. The tire molding drum attaching / detaching device according to claim 1 configured as described above. The tire molding drum attaching / detaching device according to claim 1 or 2, wherein the outer peripheral surface of the hook arm is taper-fitted to a tapered ring member, and a pressing ring member is provided on the outer peripheral surface of the tapered ring member. The tire molding drum attachment / detachment device according to claim 1, 2 or 3, wherein a protruding portion having a predetermined length that fits into a hollow portion of the molding machine main shaft is formed at the drum shaft end. The hook arm releasing means includes a sleeve provided with a tapered ring member at the tip thereof so as to be slidable along the molding machine main shaft, and a hook between a flange provided at the rear end of the sleeve and the molding machine main shaft. 5. The tire according to claim 1, wherein an elastic member that normally biases the arm in a closing direction is provided, and a release air cylinder is interposed between the flange and a body frame of the molding machine. Detachment device for molding drum.

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