JP5142375B2 - Rejuvenated tire manufacturing method and apparatus - Google Patents

Description

  The present invention relates to a retreaded tire manufacturing method and apparatus, and more particularly to a precure type retreaded tire manufacturing method and apparatus for attaching a vulcanized tread called vulcanized tread or precure tread to a base tire.

  For heavy duty pneumatic tires used in automobile tires, especially trucks and buses, the carcass layer, belt layer, etc. are often able to withstand continuous use even when the tread is fully worn. After the tread is removed from the used tire to form a base tire, a retreaded tire is obtained by attaching a vulcanized tread member having a substantially trapezoidal cross section to the crown portion of the base tire via an unvulcanized cushion rubber.

  Conventionally, as shown in FIG. 5A, as a method of attaching the vulcanized tread to the base tire, a belt-like vulcanized tread member is previously formed into an annular shape so as to have an inner diameter larger than the outer diameter of the base tire 9. Further, the inner surface of the annular vulcanized tread member 13 is fitted by fitting the annular vulcanized tread member 13 to the outer periphery of the crown portion of the base tire 9 and then applying a compressive force to the outer surface of the annular vulcanized tread member 13. There is a compression precure tread molding method in which the outer peripheral surface of the base tire 9 is pasted.

  As another method, as shown in FIG. 5B, a belt-shaped vulcanized tread member is cut in advance to a length shorter than the outer peripheral length of the base tire 9, and the belt-shaped vulcanized tread member 14 is mounted on the base. At the final stage of winding around the outer surface of the tire 9, that is, at the stage of winding the rear end portion of the belt-shaped vulcanized tread member 14, the operator checks the remaining length by visual observation, and the tread member pressing roll (not shown) By adjusting the amount of pressure increase, the tension of the belt-shaped vulcanized tread member 14 is increased and the length thereof is extended, and the front and rear ends of the belt-shaped vulcanized tread member 14 are aligned on the outer surface of the base tire 9. There is a tension precure tread molding method.

  However, in the compression precure tread molding method, since a plurality of locations (eight locations in the figure) in the tire circumferential direction of the annular vulcanized tread member 13 are attached by pressing, a pressed portion and a portion that is not. As a result, the outer diameter of the annular vulcanized tread member 13 fluctuates at a cycle of N times one rotation of the tire (generation of N-order component). Further, since it is impossible to change the shape of the annular vulcanized tread member 13 after molding, it is not possible to cope with a change (variation) in the outer shape of the base tire 9 due to the accuracy of the buffing process, and a stable uniformity is maintained. Is difficult.

  Further, in the tension precure tread molding method, the vicinity of the rear end portion of the belt-like vulcanized tread member 14 wound around the base tire 9 is wound in a state of being pulled more strongly than the other portions, so that the meat pressure is partially Can be made thinner, which adversely affects uniformity.

  On the other hand, instead of making the outer diameter of the annular vulcanized tread 13 or the total length of the belt-shaped vulcanized tread 14 different from the outer diameter of the base tire 9, the outer peripheral length of the base tire 9 is measured in advance. Then, the vulcanized tread member is cut to a fixed length according to the outer peripheral length thereof, and the cut strip-like vulcanized tread member is wound around the base tire 9 without applying tension, and both ends are overlapped and pressed. A winding type precure tread molding method that can improve uniformity by bonding is also known (see Patent Document 1).

However, in the case of tires for trucks and buses, the length of the cut vulcanized tread member is about 3.5 m, so a server for supplying it to the outer peripheral surface of the base tire 9 becomes long. There is a problem that a molding apparatus having a large size.
JP 2003-320594 A (paragraph 0002)

  The present invention has been made to solve such a problem, and its purpose is to supply a belt-shaped vulcanized tread member to the outer peripheral surface of the base tire so as to have a length corresponding to the outer peripheral length of the base tire. It is to be able to reduce the length of the means for supplying the belt-shaped vulcanized tread member to the outer peripheral surface of the base tire when cutting and sticking.

The invention according to claim 1, comprising the steps of winding and supplying a strip-shaped vulcanized tread member on the outer peripheral surface of the base tire, the belt-shaped vulcanized tread member on the outer peripheral surface of said platform tire, the belt-shaped vulcanized tread When the member is wound around a part of the outer peripheral surface of the base tire, a step of obtaining the outer peripheral length of the portion that has not been wound yet, and before winding that is supplied to the outer peripheral surface of the base tire according to the outer peripheral length and cutting the strip-shaped vulcanized tread member, possess and bonding the ends of the cut strip vulcanized tread member, said feeding step, said strip-shaped vulcanized tread member winding of A tread member transport mechanism for unwinding and transporting the belt-shaped vulcanized tread member from the unwind reel, and the tread member transport mechanism. Rehabilitation of the holder for movably holding the direction of the outer peripheral surface of the tire, characterized in that performing by the moving means for advancing and retracting the tread member conveying mechanism in the direction of the outer peripheral surface of said platform tire on said holding body A tire manufacturing method.
According to a second aspect of the present invention, in the method for manufacturing a retread tire according to the first aspect, in the cutting step, the length from the front end to the rear end of the belt-shaped vulcanized tread member is longer than the outer peripheral length of the base tire. And the step of joining the both ends includes a step of overlapping the rear end side on the front end side, and a step of pressing the overlapped rear end side. It is.
According to a third aspect of the present invention, in the method for manufacturing a retread tire according to the first aspect, the step of obtaining the outer peripheral length includes a predetermined front end in a winding direction at a winding start position of a front end of the belt-shaped vulcanized tread member in the middle of winding. From the step of detecting at the detection position, the detected time point, the outer diameter data of the base tire, the angular difference between the winding start position and the tip detection position, and the winding speed, the front of the tip detection position in the winding direction And a step of calculating an outer peripheral length of a portion where the belt-shaped vulcanized tread member is not wound at the time when winding to an arbitrary position is completed.
According to a fourth aspect of the present invention, there is provided means for supplying a belt-like vulcanized tread member to a predetermined winding start position on the outer peripheral surface of a base tire, means for rotating the base tire, and belt-vulcanized for the winding start position. Cutting means for cutting the belt-shaped vulcanized tread member at a predetermined cutting position rearward in the supply direction of the tread member, and the front end of the belt-shaped vulcanized tread member wound around the base tire in the winding direction with respect to the winding start position The belt-shaped vulcanized tread based on the front end detecting means for detecting that the predetermined front end detection position has been reached, the outer diameter data of the base tire, and the angular difference between the winding start position and the front end detection position. Means for calculating the outer peripheral length of the part where the member is not wound, the calculated outer peripheral length and the length from the winding start position to the cutting position There possess control means for operating said cutting means when a corresponding, and means for joining the rear end and the leading end of the strip-shaped vulcanized tread member formed by the cutting, the supply means, the strip A tread member conveying mechanism that unwinds and conveys the belt-shaped vulcanized tread member from the unwinding reel, and a tread member conveying mechanism on which the unwinding reel around which the vulcanized tread member is wound is mounted. rehabilitation of the holder for movably holding the direction of the outer peripheral surface of the tire, characterized in that the perforated and moving means for advancing and retracting the tread member conveying mechanism in the direction of the outer peripheral surface of said platform tire on said holding body A tire manufacturing apparatus.
According to a fifth aspect of the present invention, in the retreaded tire manufacturing apparatus according to the fourth aspect, the supplying means is configured to incline the holding body so that the belt-shaped vulcanized tread member is supplied from a tangential direction of the base tire. an apparatus for manufacturing a retreaded tire according to claim Rukoto to have a means for setting the.
The invention of claim 6 is a retread tire manufactured by the method for manufacturing a retread tire according to any one of claims 1 to 3.

According to the present invention, when the belt-like vulcanized tread member is supplied to the outer peripheral surface of the base tire, and cut and pasted to a length corresponding to the outer peripheral length of the base tire, the belt-vulcanized tread member is attached to the base tire. It is possible to reduce the length of the means for supplying the outer peripheral surface.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a configuration of a retread tire molding apparatus according to an embodiment of the present invention. This tire molding device includes a base tire support 1, a tread member server 2, a cutter 3, a pressing roll 4, and a tip detection sensor 5.

  The base tire support 1 can rotatably support the base tire 9 and can rotate the base tire 9 by a built-in rotational driving means.

  The tread member server 2 is a means for supplying a belt-shaped vulcanized tread member (not shown) to a predetermined winding start position on the outer peripheral surface of the base tire 9 supported by the base tire support 1. On the conveyor holding table 22, the proximal end support 22 that supports the proximal end of the conveyor holding table 21, the distal support 23 that supports the distal end of the conveyor holding table 22 so as to be movable up and down, and the conveyor holding table 22 And a tread member conveying mechanism including a driving roll 24 and a roller conveyor 25 that are slidably installed in the front-rear direction (left-right direction in the figure).

  The front end side support body 23 includes a piston cylinder mechanism, and the front end of the piston rod 23a is swingably attached to the lower surface of the conveyor holding base 21 by a swing shaft 23b. The upper end of the base end side support 22 is swingably attached to the lower surface of the conveyor holding base 21 by a swing shaft 22a. Therefore, the conveyor holding base 21 can be swung around the rocking shaft 22a on the base end side by advancing and retracting the tip of the piston rod 23a of the front end side support 23. By setting the swing angle, the belt-shaped vulcanized tread member can be supplied to the outer peripheral surface of the base tire 9 from the tangential direction. In addition, the base end side of the front end side support body 23 can be swung by a rocking shaft 23c, whereby the height of the front end side support body 23 can be adjusted.

The drive roll 24 and the roller conveyor 25 are each attached to a frame (not shown), and the frame is attached to be slidable back and forth on the conveyor holding base 22. The means for sliding is a ball screw mechanism and a motor, or a piston cylinder mechanism.

  The cutter 3 advances and retreats in conjunction with the advance and retreat of the tread member transport mechanism. Further, the belt-like vulcanized tread member supplied to the predetermined winding start position on the outer peripheral surface of the base tire 9 is cut at a predetermined cutting position behind the winding start position in the supply direction. The presser roll 4 advances and retracts in conjunction with the advance and retreat of the tread member transport mechanism. Further, both ends of the tread member wound around the outer peripheral surface of the base tire 9 are pressed against and joined to the outer peripheral surface of the base tire 9 and are attached to the outer peripheral surface of the base tire 9.

  The front end detection sensor 5 is a reflective photoelectric sensor disposed to face the outer peripheral surface of the base tire 9, and detects and detects the front end of the belt-like vulcanized tread member wound around the outer peripheral surface of the base tire 9. Generate a signal.

  Although not shown, a controller is provided for controlling the base tire support 1, the tread member server 2, the cutter 3, the pressing roll 4, and the tip detection sensor 5 described above.

Operation | movement of the retreaded tire shaping | molding apparatus which has the above structure is demonstrated.
First, as shown to FIG. 2A, the base tire 9 is attached to the base tire support body 1, and the unvulcanized cushion rubber (not shown) is affixed on the outer peripheral surface. Further, a driving roll is provided for the unwinding reel 10 in which a belt-shaped vulcanized tread member 11 having a tread pattern formed on the surface thereof is wound in advance by a length corresponding to 1 to 3 of the base tires 9. After being placed on 24, the drive roll 24 and the roller conveyor 25 are operated and conveyed until the tip of the belt-shaped vulcanized tread member 11 reaches a little ahead of the tip of the roller conveyor 25 (position where it hits the pressing roll 4). At this time, the attitude of the conveyor holding base 21 is kept horizontal.

Next, as shown in FIG. 2B, the conveyor cylinder 21 is moved clockwise by operating the piston cylinder mechanism of the front end support 23 to advance the front end of the piston rod 23a. As the conveyor holding base 21 starts swinging, the drive roll 24 and the roller conveyor 25 are slid forward on the conveyor holding base 21 so that the tip of the roller conveyor 25 reaches a predetermined position on the outer peripheral surface of the base tire 9. At this time, the cutter 3 and the pressing roll 4 move forward and obliquely upward corresponding to the slide of the driving roll 24 and the roller conveyor 25.

Here, the swing angle of the conveyor holding base 21, the drive roll 24, the roller conveyor 25, and the like are set so that the belt-like vulcanized tread member 11 is supplied from the tangential direction of the outer peripheral surface of the base tire 9. This point will be described with reference to FIG.

  3A, the distance in the center direction of the swing shaft 22a from the center 9a of the base tire 9 to the upper end of the base support 22 is L0, the radius of the base tire 9 is R, and the conveyor holding base from the center of the swing shaft 22a. 21 is Hb, the swing angle of the conveyor holding base 21 is θ, the angle between the center of the swing shaft 22a and the center 9a of the base tire 9 and the horizontal direction is θ1, When the angle formed by a straight line drawn perpendicularly to a straight line obtained by rotating the vertical line passing through the center 9a of the base tire 9 from the center of the swing shaft 22a clockwise by θ is θ2, the following equations [1] to [3] The relationship holds.

sin θ1 = Hb / √ (L0 ² + Hb ² ) (1)
sin θ2 = (R−Hb) / √ (L0 ² + Hb ² ) Equation [2]
θ = θ1 + θ2 Formula [3]

  Further, in FIG. 3B, the swing shaft 23c on the proximal end side of the piston rod 23a from the center of the swing shaft 23b at the distal end of the piston rod 23a in a state where the conveyor holding base 21 swings clockwise by an angle θ from the horizontal direction. Ls, the length from the center of the swinging shaft 23b to the center of the swinging shaft 23c when the piston rod 23a is most retracted and the conveyor holding base 21 is maintained horizontally, Lc, The distance between the straight lines passing through the centers of the swing shaft 23b and the swing shaft 22a and parallel to each other and perpendicular to the upper surface of the conveyor holding base 21 is L, and the conveyor holding base 21 swings clockwise by an angle θ from the horizontal direction. In this state, the vertical distance (height difference) between the swing shaft 23b and the swing shaft 23c is Ya, the horizontal distance is Xa, and the horizontal distance between the swing shaft 23c and the swing shaft 22a is X, that Assuming that the distance in the straight direction is Y, and the distance between the straight lines passing through the centers of the swing shaft 23b and the swing shaft 22a and parallel to each other and parallel to the upper surface of the conveyor holding base 21 is Hc, The relationship [7] is established.

Xa = (Lcosθ) −X− (Hc sinθ) Equation [4]
Ya = (Lsin θ) + Y + (Hc cos θ) Equation [5]
Ls = √ (Xa ² + Ya ² ) (6)
Cylinder stroke = Ls-Lc ... Formula [7]

Next, as shown in FIG. 4A, the base tire 9 is rotated counterclockwise, and the belt-shaped vulcanized tread member 11 is continuously unwound from the unwinding reel 10 by the driving roll 24 and the roller conveyor 25. The vulcanized tread member 11 is wound around the outer peripheral surface of the base tire 9 from the tip 11a. At this time, the belt-shaped vulcanized tread member 11 is wound without applying tension. When the leading end 11a of the belt-shaped vulcanized tread member 11 is wound to a position facing the leading end detection sensor 5, the leading end detection sensor 5 generates a detection signal.

  The detection signal of the tip detection sensor 5 is sent to the controller. The controller receives this detection signal and generates a control signal for operating the cutter 3. Specifically, as shown in FIG. 4B, the angle difference from the winding start position 9 b of the belt-shaped vulcanized tread member 11 in the base tire 9 to the front end detection position facing the front end detection sensor 5, the outer diameter data of the base tire 9 Based on the rotational speed of the base tire 9, the belt-shaped vulcanized tread member 11 is further wound over the outer peripheral length P2 from the tip detection position, and the outer peripheral length P3 of the unwrapped portion is cut from the winding start position 9b. The cutter 3 is operated when it becomes slightly shorter than the distance P1 along the belt-like vulcanized tire member 11 up to the cutting position 3. Here, when the cutter 3 is operated, it is preferable to temporarily stop the rotation of the base tire 9.

  Next, as shown in FIG. 4C, the front end 11a of the belt-shaped vulcanized tread member 11 and the rear end 11c formed by cutting with the cutter 3 are pressed by the press roll 4 in the vicinity of the winding start position of the base tire 9. Pressed against the outer peripheral surface. At this time, when P3 in FIG. 4B is slightly shorter than P1, the belt-shaped vulcanized tire member 11 before winding, that is, the winding start position 9b is present behind the belt-shaped vulcanized tire member 11 in the supply direction. Since the belt-shaped vulcanized tire member 11 is cut, the length of the belt-vulcanized tread member 11 is slightly longer than the outer peripheral length of the base tire 9. For this reason, although the rear end side of the belt-shaped vulcanized tire member 11 overlaps the front end side, the rear end side is joined with the rear end side being slightly shrunk by being pushed by hand so that the rear end is in close contact with the front end. It is affixed on the outer peripheral surface. By doing in this way, it can stick more strongly compared with the case where it butt | matches without overlapping.

  Thus, molding of one retread tire is completed. This retread tire is removed from the base tire support 1, and a retread tire is manufactured by vulcanizing the cushion rubber with a vulcanizing device (not shown).

  Thus, according to the retreaded tire molding apparatus of the present embodiment, the unwinding reel 10 of the belt-like vulcanized tread member 11 is placed on the conveyor, and the conveyor angle is adjusted to the tangential direction of the outer peripheral surface of the base tire 9. The belt-shaped vulcanized tread member 11 is supplied to the outer peripheral surface of the base tire 9 while the base tire 9 is rotated while approaching the outer peripheral surface of the base tire 9, and the belt-shaped vulcanized tread member 11 is supplied to the outer peripheral surface of the base tire 9. The outer peripheral length P2 of the remaining portion is from the length P1 from the winding start position 9b of the belt-like vulcanized tread member 11 to the cutting position of the cutter 3 at the rear in the supply direction. When the belt-shaped vulcanized tread member 11 is cut and joined on the outer peripheral surface of the base tire 9 when it becomes a little shorter, the belt-shaped vulcanized that has been cut in advance according to the outer peripheral length of the base tire 9 Compared with the case of carrying the tread member 11 in the conveyor, it is possible to reduce the length of the conveyor. Thereby, the whole molding apparatus can be reduced in size.

  Next, a retread tire of size 11R22.5 is manufactured by each of the retread tire molding apparatus of this embodiment, the compression precure tread molding method shown in FIG. 5A, and the tension precure tread molding method shown in FIG. 5B, and RFV (Radial The results of measuring Force Variation are shown in Tables 1 to 3 below. Here, Table 1, Table 2, and Table 3 are respectively 4 pieces (Products 1 to 4) and 4 pieces (Product 5) manufactured by the present embodiment, the compression precure tread molding method, and the tension precure tread molding method, respectively. -8) Measurement results of two (product 9, 10) retread tires.

  The compression rate in these tables is a value expressed as a percentage of the value of “1−“ periphery length of base tire ”÷“ perimeter length of pasted vulcanized tread member ”. In addition, products with compression rates of −0.15% and −0.3% in Table 1 are manufactured with the overlapping amount of the rear end 11c with respect to the front end 11a of the band-shaped vulcanized tread member 11 in FIG. 4C being 5 mm and 10 mm, respectively. It is a thing.

  The standard value of RFV of the product tire is 1275N or less. According to Tables 1-3, all products of the tension precure tread molding method do not meet the standards, and some of the products of the compression precure tread molding method (standard) are standard thread (1192N). Since all the products in the form satisfy the standard, it was proved that this embodiment is effective in improving uniformity.

It is a figure which shows the structure of the retreaded tire shaping | molding apparatus of embodiment of this invention. It is a figure for demonstrating the process until the front-end | tip of a strip | belt-shaped vulcanized tread member is supplied to the outer peripheral surface of a base tire with the retreaded tire molding apparatus of embodiment of this invention. It is a figure explaining the means for supplying the belt-shaped vulcanized tread member in the tangential direction of the peripheral surface of a base tire in the retreaded tire molding device of the embodiment of the present invention. It is a figure for demonstrating the process after starting to wind a strip | belt-shaped vulcanized tread member around a base tire by the rehabilitation tire shaping | molding apparatus of embodiment of this invention. It is a figure which shows the conventional compression precure tread molding method and tension precure tread molding method.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... stand tire support body, 2 ... tread member server, 3 ... cutter, 4 ... pressing roll, 5 ... tip detection sensor, 11 ... strip-shaped vulcanized tread member, 21 ... conveyor holder, 22 ... proximal end support, 23 ... distal end support, 24 ... drive roll, 25 ... roller conveyor.

Claims (6)

Supplying the belt-shaped vulcanized tread member to the outer peripheral surface of the base tire;
A step of winding said strip vulcanized tread member on the outer peripheral surface of said platform tire,
When the belt-like vulcanized tread member is wound around a part of the outer peripheral surface of the base tire, a step of obtaining an outer peripheral length of a portion that is not yet wound;
Cutting the belt-shaped vulcanized tread member before winding that is supplied to the outer peripheral surface of the tire according to the outer peripheral length;
Possess and bonding the ends of the cut strip vulcanized tread member,
A tread member transport mechanism for unwinding and transporting the belt-shaped vulcanized tread member from the unwinding reel, on which the unwinding reel around which the belt-shaped vulcanized tread member is wound is placed in the supplying step, A holding body that holds the tread member conveyance mechanism so as to be able to advance and retreat in the direction of the outer peripheral surface of the pedestal tire; A method for producing a retread tire, characterized in that it is executed . In the manufacturing method of the retreaded tire of Claim 1,
The step of cutting is performed such that the length from the front end to the rear end of the belt-like vulcanized tread member is longer than the outer peripheral length of the base tire, and the step of joining the both ends is performed on the front end side. A method for manufacturing a retread tire comprising a step of overlapping the rear end side and a step of pressing the overlapped rear end side. In the manufacturing method of the retreaded tire of Claim 1,
The step of obtaining the outer peripheral length includes a step of detecting the front end of the belt-shaped vulcanized tread member in the middle of winding at a predetermined front end detection position in front of the winding direction of the winding start position, and at the time of detection, From the diameter data, the angle difference between the winding start position and the tip detection position, and the winding speed, when the winding from the tip detection position to an arbitrary position ahead in the winding direction is finished, and at that time, the belt-like vulcanized tread And a step of calculating an outer peripheral length of a portion around which no member is wound. A means for supplying the belt-like vulcanized tread member to a predetermined winding start position on the outer peripheral surface of the base tire, a means for rotating the base tire, and a rear side in the supply direction of the belt-like vulcanized tread member with respect to the winding start position. Cutting means for cutting the belt-shaped vulcanized tread member at a predetermined cutting position, and a tip of the belt-cured tread member wound around the base tire at a predetermined tip detection position forward of the winding direction with respect to the winding start position A portion where the belt-shaped vulcanized tread member is not wound based on the tip detection means for detecting arrival, the outer diameter data of the base tire, and the angular difference between the winding start position and the tip detection position When the means for calculating the outer perimeter length corresponds to the calculated outer perimeter length and the length from the winding start position to the cutting position And control means for operating the serial cutting means, and means for joining the rear end and the leading end of the strip-shaped vulcanized tread member formed by the cleavage possess,
The supply means is a tread member conveying mechanism for unwinding and conveying the belt-shaped vulcanized tread member from the reel-out reel, on which an unwinding reel around which the belt-shaped vulcanized tread member is wound is placed. A holding body that holds the tread member conveying mechanism so as to be movable forward and backward in the direction of the outer peripheral surface of the base tire; and an advancing / retracting means for moving the tread member conveying mechanism forward and backward in the direction of the outer peripheral surface of the base tire An apparatus for manufacturing a retread tire. In the retreaded tire manufacturing apparatus according to claim 4,
It said means for supplying the apparatus for producing a retreaded tire according to claim Rukoto said strip vulcanized tread member having a means for setting the inclination of the holding member so as to be supplied from the tangential direction of the base tire.   A retread tire manufactured by the method for manufacturing a retread tire according to any one of claims 1 to 3.

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