KR20000013154A - Tire tread contact face heating device - Google Patents

Abstract

PURPOSE: A tire tread contact face heating device is provided to improve the adhesive power while forming by uniforming the temperature of the cutting face of a tread, also to express excellent uniting force after vulcanizing. CONSTITUTION: The tread heating device is composed of: many transferring rollers(3) horizontally established to a work stand(2) held up by a frame(1) with its both sides; a heating device consisted of a front end heater(4) and the rear end heater(5) horizontally established at left and right sides of the work stand(2); a sensing device consisted of a front end sensor(6) and a rear end sensor(7) at a place close to the heating device; a tread arranging device made up of a front end guide unit(8) and a rear end guide unit(9) at each side of the sensing device; and a driving device containing a motor(10) for right and reverse rotating in the center of the work stand(2).

Description

Tire tread joint heater

The present invention relates to a device for heating both ends of the tread portion of the semi-finished product constituting the tire, and in particular, by radiating infrared rays at a constant wavelength to the bonding surface of the tread to improve the adhesion of the tread when forming the tread on the drum, the bonding surface after vulcanization It relates to a tire tread joint surface heater to increase the bonding force of the.

In general, green tires before finished tires are extruded with rubber, blended rubber compounded with carbon, sulfur and other rubber chemicals to make a tread, cut only the necessary parts, and then combine several other semi-finished products on the forming drum The process is completed in a cylindrical shape.

Green tires completed through this series of processes are put into a molding mold that determines the appearance of the tire, that is, the tire, and the inside and the outside of the mold are heated by heating the inside and the outside of the mold through the fruit or vegetable such as steam or hot water. When a certain time passes, the rubber and sulfur compounded by the vulcanizing agent in the mixing process react with each other, and a strong and strong bonding force is generated by chemical reaction between rubber molecules, increasing the elasticity and tensile strength of the tire. At the same time, the tire is finished with a stable resistance to chemicals and temperature.

On the other hand, in the past, the bonding surface was treated by using a method of spraying a rubber paste made by melting rubber with a solvent when bonding the tread to a bonding surface or cutting or cooling cutting with an electric knife.

However, in the conventional work method, since the tread portion of the tire is made of synthetic rubber, the adhesive strength of the joint surface is lowered, and the solvent used to melt the rubber becomes one of the causes of environmental pollution, as well as workability when cutting with an electric knife. There are various problems such as greatly deteriorated and uneven cut surface.

Accordingly, the present invention has been invented to solve the above-described problems, the alignment means for aligning the tread with the drive means for transferring the tread to the heating position and the heating means for heating the front and rear ends of the tread By advancing and retreating the tread on the conveyor and radiating infrared rays to the front and rear ends of the tread for a predetermined time, the cutting surface temperature of the tread is made uniform to improve the bonding force during molding and excellent after vulcanization. It is an object of the present invention to provide a tire tread joint surface heating device that can exhibit a bonding force.

1 is a schematic configuration diagram of a tread heating device according to the present invention,

Figure 2 (a) is a front view of the tip heater according to the present invention,

2 (b) is a side view of the tip heater according to the present invention,

3 (a) is a front view of the rear heater according to the present invention,

3 (b) is a side view of the rear heater according to the present invention,

Figure 4 (a) is a front view of the guide unit according to the present invention,

4 (b) is a side view of the guide unit according to the present invention,

5 is a cross-sectional view showing an installation of the motor according to the present invention.

1 --- frame 2 --- worktable

3 --- Feed roller 4 --- Tip heater

5 --- Rear heater 6 --- Front sensor

7 --- Rear sensor 8 --- Tip guide unit

9 --- Rear guide unit 10 --- Motor

11 --- rotary shaft 12 --- tread

13 --- support plate 14,24 --- bush

15 --- Information Bar 16 --- Longines

17 --- Height adjustment bracket 18 --- Shaft

19 --- Leg 20, 30 --- Mounting bracket

21,22 --- Heater 23 --- Support Bracket

25 --- rotating shaft 26 --- clamp lever

27 --- Connecting piece 28 --- Bearing

29 --- alignment roller 31 --- lever 1

32 --- cylinder 33 --- cylinder rod

34 --- 2nd lever

The present invention for achieving the above object, the heating means consisting of a plurality of rollers installed in a horizontal direction on the workbench supported on both sides of the frame, heating consisting of the front end heater and the rear heater is installed in the vertical direction on the left and right sides of the workbench Means, sensing means comprising a leading sensor and a trailing sensor at a position adjacent to the heating means, a tread alignment means composed of a leading guide unit and a trailing guide unit on one side of the sensing means, respectively, With a driving means composed of a rotating motor, while detecting the bonding surface of the tread through the sensing means while advancing and retreating the tread mounted on the conveying means via the driving means, and then tread bonding through the heating means The surface is configured to emit infrared rays for a predetermined time.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic configuration diagram of a tread heating apparatus according to the present invention, the present invention is a plurality of feed rollers (3) installed in the horizontal direction on the worktable (2), both sides of which are supported on the frame (1) A heating means composed of a feed means composed of a feeder, a front end heater 4 and a rear end heater 5 installed in a vertical direction on the left and right sides of the work table 2, a front end sensor 6 and a rear end in a position adjacent to the heating means. Sensing means composed of a sensor (7), tread alignment means composed of a leading guide unit (8) and a rear guide unit (9) on one side of each of the sensing means and the forward / reverse rotation to the approximately center position of the work table (2) It consists of a drive means composed of a motor (10).

Here, the conveying means has a plurality of feed rollers (3) arranged on the same rotating shaft 11, the roller unit is arranged so as to form a row in the horizontal direction on the work table (2), the tread mounted on the feed roller (3) 12) is moved forward and backward by the drive means.

And the heating means is the front of the work table (2) through the known fastening means such as bolts and nuts to the work table as shown in Figs. 2 (a), (b) and 3 (a), (b), respectively In FIG. 1, the guide bar 15 is installed to the left in the vertical direction, that is, the tip heater 4 slides up and down through a pair of bushes 14 attached to the support plate 13. And a shaft 18 which is installed between these guide bars 15 and bolted via a height adjusting bracket 17 having a pair of long holes 16, the guide bars 15 and the shaft 18. The mounting bracket 20 is attached to both ends of the mounting bracket 20 is fixed to one end of the known means through the fastening means, and the heater 21 fixed to face in the vertical direction via the leg (19) Has a structure provided with.

Therefore, when the fixed state of the height adjustment bracket 17 is released, the shaft 18 connected to the installation bracket 20 is slid up and down within the bush 14 through the guide bar 15, so that the heater Moving the 21 to the desired installation position and then fixing the height adjustment bracket 17 again allows the heater 21 to maintain the set position.

At this time, since the installation height of the heater 21 is set through the long hole 16 formed in the height adjusting bracket 17, when the size of the long hole 16 is adjusted, the height adjusting range of the heater 21 may be extended. It becomes possible.

In addition, the rear end heater 5 is installed in the same structure as the front end heater 4 described above except for the installation position and the installation direction of the heater 21. That is, the rear end heater 5 is the front end heater 4. 1 is installed on the lower side of the work table (2) on the right side with respect to the installation position of the heater, the heater 22 is installed to face in the vertical direction with respect to the work table (2), the tip heater (4) ) And the same parts as the same reference numerals will be omitted detailed description thereof.

Meanwhile, the tip guide unit 8 and the rear guide unit 9 constituting the tread alignment means have the same structure as shown in FIGS. 4 (a) and 4 (b), that is, the work table 2. Support brackets 23 having a substantially L-shape are fixedly attached to the left and right predetermined positions of the bolts through fastening means such as bolts, and the support brackets 23 are provided with bushes 24 and penetrate the bushes 24. The rotary shaft 25 is installed so that the clamp lever 26 is installed at the upper end of the rotary shaft 25 so as to be manually operated, and the lower end is provided with a bearing 28 through a separate connecting member 27. The alignment roller 29 is attached to the structure.

Therefore, when the clamp lever 26 is operated, the roller 29 is angularly displaced by a predetermined angle from side to side with respect to the rotation shaft 25 through the connecting member 27, while operating the clamp lever 26. It is possible to press and support the longitudinal edge of the tread 12 mounted on the feed roller 3, so that the tread can be aligned according to the changing size even if the tread width and size change.

In addition, as shown in FIG. 5, the motor 10 constituting the driving means has a first lever hinged at one end thereof via an installation bracket 30 fixed vertically to one side of the worktable 2. 31 is fixedly attached, and the other end of the first lever 31 is connected and installed through the rod 33 of the cylinder 32 installed in the horizontal direction on the work table 2 and the second lever 34. As a result, the rod 33 is pivoted by a predetermined angle clockwise and counterclockwise about the hinge point P as the rod 33 is extended and contracted.

Hereinafter, the operation and the working sequence of the present invention will be described.

Tire tread joint surface heating apparatus according to the present invention is electrically connected to the conveying means and the heating means, the sensing means and the driving means, to align the tread 12 mounted on the work table (2) through the tread alignment means Then, the operation of radiating infrared rays on both cutting surfaces of the tread 12 via the heating means while advancing and retreating the treads 12 arranged in accordance with a predetermined control signal applied by the sensing means on the transfer roller 3 is performed. It is intended to be done repeatedly.

That is, when the control signal is applied to the cylinder 32 while the tread to be joined is placed on the feed roller 3 of the work table 2, the rod 33 is retracted to pull the second lever 34. Accordingly, as the first lever 31 connected to the second lever 34 is interlocked, the motor 10 is pivoted about the hinge point P in the clockwise direction. Then, the motor 10 pushes the tread to the right in FIG. 1 while the motor rotates forward, and when the rear end sensor 7 detects the rear end of the tread in which the rear end sensor 7 is moved, the motor 10 controls the motor 10. The motor 10 is rotated counterclockwise about the hinge point P as the signal is applied to stop the motor rotation and the cylinder rod 33 is advanced. In this case, a control signal is applied to the rear heater 5 to emit infrared rays to the rear junction surface of the tread through the heater 22 for a predetermined time.

As such, when the infrared radiation to the trailing junction of the tread is completed, the tread is moved back to the left side in FIG. 1 for the radiation of the trailing junction of the tread. That is, the cylinder rod 33 has a predetermined control signal. As the motor 10 is rotated clockwise again when the motor is advanced, the tread is advanced in the left direction of FIG. 1 as the motor 10 is reversely rotated, and the tip sensor 8 moves to the front end of the tread. When the sensing signal is applied to the motor 10, the motor rotation is stopped and at the same time the cylinder 32 is advanced, the motor 10 is rotated counterclockwise around the hinge point P. The tip heater 4 then emits infrared rays for a predetermined time to the tip joint surface of the tread.

In this way, the tread radiated with infrared rays at the front and rear joint surfaces is moved to the left side in FIG. 1 in order to be moved to the forming drum. As the control signal is applied to the cylinder 32 to rewind the cylinder rod 33, the motor 10 is rotated clockwise about the hinge point P and the tread is advanced by reverse rotation. ) Will be ready to enter immediately.

The following is a specific embodiment of the present invention.

1. Experimental data of Example 1

Sample 1 Sample 2 Sample 3 Sample 4 Cutting surface treatment method Cooling cutting Rubber paste Electric knife Infrared radiation Irradiation Condition-Wavelength Temperature 300 ℃ 3㎛500 ℃ Bonding force (Kgf) 0.2Kgf 0.5Kgf 0.8Kgf 1.1Kgf Bonding surface vulcanization coupling force (Kgf) 28Kgf 25Kgf 31Kgf 36Kgf

2. Experimental data of Example 2

Sample 21 Sample 22 Sample 23 Sample 24 Cutting surface treatment method Infrared radiation Infrared radiation Infrared radiation Infrared radiation Irradiation Condition-Wavelength Temperature 3㎛100 ℃ 50㎛100 ℃ 3㎛500 ℃ 50㎛500 ℃ Bonding force (Kgf) 0.9Kgf 0.9Kgf 1.1Kgf 1.0Kgf Bonding surface vulcanization coupling force (Kgf) 32Kgf 32Kgf 36Kgf 34Kgf

3. Test Sample Composition

Compounding agent (100 rubber standard) Tread rubber Rubber paste rubber 1. Raw material rubber 2. Reinforcing agent 3. Active agent 4. Anti-aging agent 5. Vulcanizing agent Synthetic rubber: 137.5 PHRHAF (High Abrasion Furnave): 80 PHR Zincation: 3 PHR Stearic acid: 2 PHR Phenylamine type Desulfurizer: 4 PHR Sulfur: 3.8 PHR Natural rubber: 100 PHRHAF (High Abrasion Furnave): 50 PHR Zincation: 5 PHR Stearic acid: 2 PHR Phenylamine type Lubricant: 5 PHR Sulfur: 3.5 PHR

4. Measuring method

1) Bonding force

end. The tread rubber was heated at a temperature of 100 ° C. for 3 minutes in a mold consisting of 200 mm × 200 mm × 1 mm, and then left for 2 hours.

I. The upper sample is a vulcanized sample with a width of 13 mm and a length of 160 mm. The lower sample has a size of 30 mm x 70 mm, which is treated with four kinds of joint surfaces according to the four conditions.

All. The measuring device uses Japanese PIGMA-II manufactured by Toyoseike.

la. The measuring conditions were: Crimping speed: 500mm / min, Crimping load: 500g, Crimping time: 0, Peeling speed: 1250mm / min.

hemp. The measured value is taken as the average value of 5 times.

2) bonding surface vulcanization coupling force

end. Treat the tread joint surface under the above 4 conditions, place the OHP film with three rectangles of 6mm × 60mm size, put the sample rubber on both sides of the film, and cover the cord paper to prevent deformation.

I. The prepared sample was quenched for 10 minutes at a temperature of 170 ° C. and then divided into three parts.

All. Measure each at a rate of 100 mm ± 5 / min until the sample tears in the tensile tester.

la. Sample measurements are averaged by taking the peak of each peak.

As described above, the bonding force (adhesive force: TACK) of the joint surface bonded by the tire tread joint surface heating apparatus according to the present invention and the bonding force (pulling force; pull-out) after vulcanization are applied to the electric knife cutting and rubber paste coating and cooling cutting, which are conventional methods. As a result of the comparison with the method, the bonding force of the joint surface was in the order of infrared radiation> cutting knife> coating glue> cooling cutting, and the binding force after vulcanization was in the order of infrared radiation> cutting knife> cooling cutting> rubber paste. (Example 1)

In addition, when the wavelength is 3㎛ and 50㎛ and the temperature is 100 ℃ and 500 ℃, the wavelength is better than that when 3㎛ is 50㎛, and the temperature is 500 ℃ rather than 100 ℃. It was found to be superior, and that the effect of temperature conditions was greater than the wavelength, that is, working at low wavelengths and at high temperatures was found to further improve the bonding force. (Example 2)

As described above, the tire tread joint surface heating apparatus of the present invention radiates infrared rays to the front and rear ends of the tread, that is, both joint surfaces of the tread for a predetermined time while advancing and reversing the tread, so that the cutting surface temperature of the tread is uniformly increased. It improves the bonding force during molding and shows excellent bonding force even after vulcanization.

Claims (8)

A transfer means composed of a plurality of transfer rollers 3 installed in a horizontal direction on a work table 2 supported by both sides of the frame 1, and a front end heater 4 and a rear end provided in a vertical direction on the left and right sides of the work table 2; Heating means consisting of a heater (5), sensing means consisting of a leading sensor (6) and a trailing sensor (7) at a position adjacent to the heating means, a leading guide unit (8) and a trailing guide unit on one side of the sensing means, respectively A tread alignment means composed of (9) and a drive means composed of a motor (10) forward / reversely rotated at an approximately center position of the work table (2), and the tread mounted on the conveying means is driven through the drive means. A tire tread joint surface heating apparatus configured to detect a joint surface of the tread through a sensing means while moving forward and backward, and then radiate infrared rays to the tread joint surface for a predetermined time through a heating means. According to claim 1, wherein the conveying means is arranged in such a way that a plurality of rollers 3 are arranged on the same rotary shaft 11, the roller unit is arranged in a horizontal direction on the work table 2, the rollers 3 Tire tread joint surface heating apparatus characterized in that the tread (12) raised in the forward and backward by the drive means. According to claim 1, wherein the heating means is fixed to both sides of the work table (2) and the heater (21) installed so that the heater 21 is directed in the vertical downward direction installed so that the heater 22 and the heater 22 are directed in the vertical direction It consists of a rear heater (5), these front heater (4) and the rear heater (5) through the pair of bushes (14) attached to the support plate 13 through the guide bar (s) formed so as to slide up and down ( 15) and the shaft 18, which is installed between the guide bar (15) and bolted through a height adjustment bracket (17) having a pair of long holes (16), the guide bar (15) and the shaft A mounting bracket 20 having a leg 19 attached to both ends and a heater fixed vertically downward through the leg 19 while being fixed to one end of the 18 by a known fastening means ( 21, 22) tire tread joint surface heating apparatus characterized by the above-mentioned. The tire tread joint surface heating apparatus according to claim 3, wherein the height adjustment bracket (17) is adapted to adjust the installation height via the long hole (16). The support bracket (1) according to claim 1, wherein the front end guide unit (8) and the rear end guide unit (9) constituting the tread alignment means are fixed to the left and right predetermined positions of the work table (2) by means of fastening means. 23, a rotary shaft 25 penetrated through the bush 24 fixed to the support bracket 23, a clamp lever 24 attached to upper and lower ends of the rotary shaft 25, and a connecting member ( 27) A tire tread joint surface heating apparatus comprising an alignment roller (29) having a bearing (28) provided through the connecting member (27). 6. The tire tread joint surface heating apparatus according to claim 5, wherein the tip guide unit (8) and the rear guide unit (9) are moved left and right by a predetermined distance by the operation of the clamp lever (24). According to claim 1, wherein the motor 10 is fixedly attached to the first lever 31, one end of which is hinged via a mounting bracket 30 fixed in a vertical direction to one side of the work table (2), The other end of the first lever 31 is connected to the front end of the rod 33 of the cylinder 32 installed in the horizontal direction on the work table 2 and the second lever 34, and the cylinder rod 33 Tire tread joint surface heating apparatus characterized in that it is pivoted by a predetermined angle clockwise and counterclockwise about the hinge point (P) as the elongation and contraction of. The tire tread joint surface heating apparatus according to claim 1, wherein the heating means of the heating means radiates infrared rays to the tread joint surface at a temperature of 1 to 100 µm at a temperature of 100 to 700 ° C.