JPH10128763A - Continuous vulcanization of small-sized rubber roll and apparatus therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To continuously vulcanize mass-produced small-sized rubber rolls during the passage through a vulcanization tank by a conveyor while making vulcanization temp. as high as possible without using a vulcanizing vessel. SOLUTION: Both conveyor chains 2 are intermittently moved over small- sized rubber rolls 10 within a hot air vulcanization tank 1 (chains 2' are positioned when the rolls 10 are short). When the conveyor chains are stopped, both drive shafts 5c grasp the rolls 10 upwardly to be rotationally driven for 7sec to lower the rolls 10. Whereupon, the chains 2 repeat operation advancing for 3sec to stop. The surface layers of the rolls 10 receive the heat rays of an irradiation apparatus 3 to rapidly vulcanize the surface layers of the rolls 10. The rolls 10 are separated from the part under the irradiation apparatus 3 before the surface layers are overheated and the interiors of the rolls 10 are also vulcanized until the rolls are issued from the vulcanization tank 1 only by hot air.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a small rubber roll,
For example, the present invention relates to a method and an apparatus for continuously vulcanizing a rubber roll having a diameter of about 10 to 30 mm and a length of about 150 to 500 mm.

[0002]

2. Description of the Related Art In general, small rubber rolls having the above-mentioned dimensions are vulcanized by arranging them in a certain number of shelves in a vulcanizing pot (chamber) in a fixed number, and after completion, they are all replaced.

[0003]

The vulcanizing operation using a vulcanizing furnace requires human power to store and remove the vulcanized product from the vulcanizing furnace, and the efficiency is poor because the setup time is added to the net vulcanizing time. The present invention automates this and successively passes successive rubber rolls through a vulcanization tank, ending vulcanization during its passage. The temperature in the vulcanizing tank is raised as much as possible to shorten the required time, and the vulcanizing tank which is likely to be long is shortened.

[0004]

Means for Solving the Problems In many cases, small rubber rolls are mass-produced, but the subsequent vulcanization time is much longer than the time required for coating and forming them by an extruder. Therefore, it is easy to automate the process of putting the rubber roll on the conveyor and continuously passing through the vulcanization tank.
If vulcanization is not completed within 0 minutes or 1 hour, a long floor area is required, and as a result, the efficiency is not significantly improved. However, it is said that the time required for vulcanization of rubber is reduced by half every time the vulcanization temperature rises by 10 ° C. Therefore, the present invention has devised a method of heating a rubber roll in a vulcanizing tank.

That is, as soon as the roll placed on the conveyor enters the vulcanization tank, it is exposed to strong heat rays from the ceiling. The reason for irradiating heat rays at this position is that the temperature at the entrance and exit of the heating tank is generally lower than that at the center under the influence of the outside air temperature, and the heating efficiency is extremely low. The conveyor advances by intermittent drive, and the roll is rotationally driven at each stop position. Therefore, the temperature of the roll surface rises rapidly and uniformly, and the rubber in the surface layer is preceded by vulcanization. Before the surface layer is over-vulcanized, the roll comes out of the irradiation range and is heated only by hot air. The unvulcanized portion of the inner layer of the roll is vulcanized in the time required to reach the outlet even at a temperature slightly lower than the surface layer. In the experiment, vulcanization can take 10 minutes from the inlet to the outlet.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the continuous vulcanizing method for small rubber rolls according to the present invention, small rubber rolls to be vulcanized are successively fed into a vulcanizing tank by hot air, and the above-mentioned rolls are axially moved near the vulcanizing tank entrance. Irradiate it with heat rays while rotating it around the surface, and when the surface layer of the rubber roll is rapidly heated by this irradiation and vulcanization is completed, the above rotation is stopped, the irradiation is removed, and the rubber roll is directed to the outlet. The inner layer is also discharged from the vulcanization tank over a period of time during which it is vulcanized.

The continuous vulcanizing apparatus for small rubber rolls according to the present invention comprises a hot air vulcanizing tank, a conveyor for conveying small rubber rolls from the inlet to the outlet of the vulcanizing tank, and a heating wire provided along the ceiling near the entrance of the vulcanizing tank. Irradiation device, and a rubber roll rotation drive device having a large number of pairs of drive shafts penetrating from outside the both side walls of the vulcanizing tank in order to scoop up and rotate a small rubber roll on a conveyor passing under the irradiation device, The tip of each of the many pairs of drive shafts has a conical concave surface, and the rubber roll is provided at a height slightly floating above the conveyor when sandwiching both shaft ends of the rubber roll.

[0008] It is preferable that the driving device of the conveyer stops the time when the rubber roll rotation driving device is picking up and rotating the roll, and conveys the rubber roll by intermittent driving that is driven when the rubber roll is returned onto the conveyor.

[0009] The conveyor has a pair of parallel chains with a V-shaped attachment on which both ends of a rubber roll are placed, and passes through the vulcanizing tank and circulates under the floor. By driving the interval adjusting shaft along the outer wall of the vulcanizing tank, the screw shaft orthogonal to the adjusting shaft is rotated forward and reverse to adjust the mutual interval between the pair of reciprocating chain guide blocks near the vulcanizing tank outlet and the inlet. Good to do.

[0010] The rubber roll rotation drive device is opposed to both sides of the vulcanizing tank with both outer walls interposed therebetween, and the two pairs of drive shafts each having two front and rear bearings aligned on a base frame. And a fluid pressure cylinder for extruding the bases of the drive units on both sides thereof and pressing or returning the tips of the plurality of pairs of drive shafts to both shaft ends of the rubber rolls on the conveyor. In order to cope with a change in the length of the rubber roll to be vulcanized, it is desirable to provide the extra long drive shaft, and a movable table on which the base frame is placed to approach and separate from the outer wall of the vulcanization tank.

[0011]

1 shows an apparatus according to an embodiment of the present invention. 1 is an elevation view, FIG. 2 is a plan view, and FIG. 3 is a side view. In the figure, 1
Is a hot air vulcanizing tank, 1a is its ceiling lid, 2 is a pair of right and left conveyor chains, 2a is its V-shaped attachment, FIG.
As shown in FIG. 6, the shaft end 10a of the rubber roll 10 is placed and transported. The chain 2 moves up and down the upper and lower chain wheels 2b and 2b by the drive of the motor 2c, then enters the inlet 1b of the vulcanizing tank 1 on the horizontal guide girder 2g, exits from the outlet 1c, passes through a cooling tank (not shown), and The upper and lower chain wheels 2b, 2b (FIG. 5) descend and return to the inlet side of the vulcanizing tank 1 through the floor of the apparatus as shown in FIGS. The rubber roll to be vulcanized is put on one after another manually or automatically by the automatic device before the chain 2 enters the inlet 1b of the vulcanizing tank 1, and falls out of the cooling tank at the lowered position of the chain 2 in FIG. You.

1 and 2 do not show the inside of the vulcanizing tank 1, but FIGS. 3 and 4 show a hot-ray (far-infrared) irradiating device 3 provided along the ceiling near the entrance 1b of the vulcanizing tank 1. FIG. I have. Hanging equipment 3
It is hung on the ceiling lid 1a by the bolt a. 3b is a feed line. In FIG. 1, only the bolt of the hanging tool 3 a is used to cover the ceiling lid 1.
Since it is on the upper surface of a, the mounting position of the irradiation device 3 can be known. The irradiation device 3 has four 2KWs arranged side by side,
00 ° C. The heat source of the entire vulcanizing tank 1 is hot air, and FIG.
Set hot air generator 4, hot air circulation windmill 4a, air path 4b
3 and 4 show a hot air discharge (suction) portion 4c. The maximum temperature in the tank is 350 ° C, and the normal temperature is 280 ° C.

Next, the most important part of the present invention, that is, the roll drive device, that is, the roll drive device 5 will be described. The vulcanizing tank 1 is a kind of furnace sometimes called a heating furnace, and its peripheral wall is thick as shown in FIGS. In order to heat a large number of small rubber rolls being conveyed in the vulcanizing tank 1 by a conveyor with a hot wire, each of the rubber rolls must be rotated. This is because the heat rays are uniformly irradiated on the entire circumference and the softened surface layer is not deformed. The problem is that there are many rubber rolls adjacent to each other on the conveyor, that they are being conveyed, and that they are inside a thick wall.

In the present invention, the conveyor chain 2 is intermittently driven instead of being continuously driven. In the embodiment, the transfer is repeated by moving for 3 seconds and stopping for 7 seconds. The roll driving device 5 includes the vulcanizing tank 1
And a number of drive shafts were respectively inserted into the tank so that both ends of the rubber roll on the conveyor were sandwiched from both sides. FIG. 1 is an elevational view of a drive unit of the roll driving device 5 shown in FIG. As shown in FIG. 2, the front and rear two bearings 5d that cantileverly support a large number of drive shafts 5c are densely arranged on a substrate 5b on the upper surface of the drive unit. Since the distance between the adjacent drive shafts 5c is narrow, they are alternately moved back and forth and are assembled. Each drive shaft 5c is driven by
A passive chain wheel 5e in the middle of the front and rear bearings 5d is simultaneously driven by a common chain 5f and a motor 5g (see FIGS. 1, 2, and 3).

The driving devices such as the board 5b and the motor 5g are mounted together on the base frame 5a.
The lower part of FIG. 2 (the left side of FIG. 3) is moved closer to and away from the outer wall of the vulcanizing tank 1 on a fixed base 5h by a fluid pressure cylinder 5i. Base frame 5a on the upper side of FIG. 2 (right side of FIG. 3)
Moves on the upper surface of the conveyor width adjustment moving base 6 in the same manner.
To approach and separate from the vulcanizing tank means to sandwich or separate both shaft ends of the rubber roll 10 in the tank at the tip of each drive shaft 5c on the base frame 5a.

FIG. 7 shows a centering head 7 having a conical concave surface 7a fitted to the tip of a drive shaft 5c in a state of being driven to rotate with the shaft end 10a of the roll 10 interposed therebetween. The buffer spring 8 is inserted into the shaft hole at the tip of the drive shaft 5c, and the shaft portion 7a of the centering head 7 is inserted. The shaft portion 7a is provided with a key groove 9 for retaining, and the tip of a small screw 11 screwed into the shaft 5c is inserted. The roll shaft end 10a moves on the V-shaped notch of the attachment 2a of the conveyor chain 2; Conical concave surface 7a of head 7
However, the shaft end 10a located at a slightly lower position is pushed up to the shaft center of the centripetal head 7 and sandwiched. In other words, conveyor attachment 2
Float a little from a and pinch it. In order to do so, the axis of the drive shaft 5c is slightly higher than the axis of the roll 10 on the conveyor.

The length of the small rubber roll to be vulcanized is not constant. As the length changes, the spacing between the attachments on both sides of the conveyor that receives the roll shaft ends must be changed. In addition, the opposing distance between the drive shafts on both sides, which are rotated with both ends of the roll interposed therebetween, must be changed. First, a mechanism for changing the interval between the two conveyor chains 2 will be described. If the distance between the two chain guide girders 2g visible at the left and right ends in FIG. 2 is changed, the distance between both side chains and the distance between the driven chain wheels 2b, 2b change together. This will be described below with reference to FIGS.

Along the outer wall of the vulcanization tank covered with the ceiling lid 1a shown in FIG. 2 (on the side where the hot air generator 4 and the like are located), the entire length of the conveyor chain 2, that is, an interval from the outlet of the cooling tank (not shown) to one. The adjustment shaft 12 is extended. As shown in FIG. 8, the adjusting shaft 12 is supported at important points by bearings 14, and is driven by a motor 13 via a chain wheel 14a. In this example, the gap adjusting shaft 12 shown in FIG. 8 is provided at three points: outside the inlet of the vulcanizing tank 1 (not shown), a gap between the vulcanizing tank 1 and a cooling tank (not shown), and outside the cooling tank outlet. Adjust the distance between both conveyor chains. That is, the screw shaft 16 orthogonal to the adjustment shaft 12 is rotationally driven by two bevel gears 15 (FIG. 10) at the three positions to move the movable reciprocating chain guide block 17. Block 17a is fixed.

In FIG. 9, which is an elevational view of FIG. 8, since the reciprocating chain guide block fixed side 17a is the front side, an elevational view of the left end of the movable block 17 is shown in FIG. The guide block 17 at this position must move the upper chain guide girder 2g and the direction changing upper and lower chain wheels 2b at the end of the conveyor. Therefore, the fixed side chain wheel 2 on the left side of FIG.
b and 2b are directly supported by a shaft 18 on a shaft, and the movable chain wheels 2b and 2b on the right side of FIG. The movable plate 19 is provided with a sliding cylinder 19a that slides along a guide round bar 20 extending between the machine frames 18 on both sides. The movable plate 19 is moved by a sandwiching plate 22 sandwiching the movable plate 19. The holding plate 22 is fixed to the guide block 17 shown in FIGS. Therefore, when the female threaded passive plate 21 of the guide block 17 is moved by the gap adjusting screw shaft 16, the guide block 17 itself changes the gap between the chains 2 and 2, and at the same time, moves the movable plate 19, thereby moving the chain wheel 2 b. The position is also adjusted to chain 2.

The guide round bars 20a above and below the screw shaft 16 in FIG. 11 overlap the top and bottom of each screw shaft 16 in FIG. 8, however, FIG. 8 is omitted. The dotted line 19a 'in the center of FIG. 12 indicates the position to which the right sliding cylinder 19a has moved, and the dotted line 21' indicates the moving plate 2 in FIG.
1's current position, 2 'is conveyor chain (only lower side)
Indicates the position of that time. The position of the guide round bar 20a is also indicated by a chain line for only the lower one. The distance between the solid line position before the movement of the sliding cylinder 19a and the chain line position after the movement is determined by the position at which the chain wheel 2b and the chain 2 of FIG. 12 have moved to the left or the length of the small rubber roll 10 placed thereon. Suggests.

Since the length of the rubber roll 10 to be vulcanized next changes, when the distance between the conveyor chains 2 on both sides is changed as described above, the rotary driving device 5 that rotates the rubber roll 10 is used.
The correspondence is described. 2 and 3 show the rotation driving device 5 immediately before rotating the longest rubber roll 10. As described above, the base frames 5a are slightly pushed out by the fluid pressure cylinders i of the left and right driving units, and the two shaft ends of the roll 10 are sandwiched by the respective drive shafts 5c to be rotationally driven. Now, it is assumed that the right conveyor chain 2 in FIG. 3 has been moved to the position of the chain 2 'near the center in FIG. 3 by the above-described chain interval adjusting mechanism because the length of the rubber roll 10 becomes short. In order to rotationally drive the rubber roll shaft end on the chain 2 'at this position, a drive shaft 5c long enough to be inserted into the vulcanizing tank 1 is required. Therefore, the drive shaft 5c on the right side in FIG. 3 is sufficiently longer than that on the left side.

The base frame 5 on which the front and rear bearings 5d and the drive motor 5g for supporting the drive shaft 5c of the right drive unit in a cantilever manner are mounted.
As in the case of the base frame 5a of the left driving unit, a is mounted on the sliding surface and slightly moved back and forth by the hydraulic cylinder 5i. However, the sliding surface 6a of the right driving unit is an upper surface of the movable base 6 unlike the upper surface of the fixed base 5h of the left driving unit. The moving table 6 is a rail 2 extending to the floor of the vulcanizing tank 1.
3 and move until the tip of the drive shaft 5c on the table reaches a required position in the vulcanizing tank 1.

The moving table 6 is driven by a feed screw rod 24 traversing under the floor of the vulcanizing tank 1 from the base 5h of the left driving section in FIG. 25
It is. The feed screw rod 24 reaching the inner end of the moving table 6 and the drive motor 25 thereof. A female screw 26 is provided at the inner end of the moving table 6.
Is fixed, and this is engaged with the feed screw rod 24. Therefore, when the motor 25 rotates the feed screw rod 24 via the bevel gear 27, the movable table 6 moves on the rail 23. One end of the feed screw rod 24 is supported by a base 5h bearing 28, and the other end is supported by a bearing 28 attached to a footrest 29 to which the motor 25 is also fixed. Although one embodiment has been described above, it goes without saying that the present invention can be variously changed and applied in accordance with implementation conditions without changing the gist.

[0024]

According to the present invention, the vulcanization of a small rubber roll is a continuous vulcanization system using a chain conveyor, a hot-air vulcanizing device is inserted into a hot-air vulcanizing tank to increase the vulcanizing speed, and the length and required time of the vulcanizing tank. Was shortened. During irradiation with heat rays, the rubber roll must be rotated to keep the surface uniform and prevent deformation. In this invention, a rotary drive device is installed on both outer sides of a vulcanizing tank, a large number of parallel drive shafts are penetrated into the tank, a large number of rubber rolls arranged on a conveyor are pinched from both sides, rotationally driven, lowered, and slightly advanced. This problem was solved by an intermittent drive system in which the pinch-and-rotate drive is repeated once it is made.

[Brief description of the drawings]

FIG. 1 is an elevational view of one embodiment of the apparatus of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is an enlarged side view of FIG. 1;

FIG. 4 is an enlarged view of a main part of FIG. 3;

FIG. 5 is an elevational view of the end of the chain conveyor.

FIG. 6 is an explanatory side view of FIG. 5;

FIG. 7 is an explanatory view of a tip end of a rubber roll drive shaft.

FIG. 8 is a plan view of an interval adjusting mechanism of the conveyor chains on both sides.

FIG. 9 is an elevation view of FIG. 8;

FIG. 10 is a plan view of a transmission mechanism between a gap adjusting shaft and a screw shaft.

FIG. 11 is an elevational view of the chain guide block movable side.

FIG. 12 is a side view of an interval adjusting mechanism of the both-side chain wheel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vulcanization tank 2 Conveyor chain 3 Hot air irradiation device 5 Roll drive device 10 Small rubber roll 12 Interval adjustment shaft

──────────────────────────────────────────────────続 き Continued on front page (51) Int.Cl. ⁶ Identification code FI B29L 31:32

Claims (5)

[Claims] 1. Small rubber rolls to be vulcanized are successively fed into a vulcanization tank by hot air, and each roll is rotated around its axis near the entrance of the vulcanization tank while irradiating it with heat rays. When the surface layer of the rubber roll is rapidly heated by this irradiation and vulcanization is completed, the above rotation is stopped, the irradiation is removed from the irradiation, and the outlet is directed to the outlet. A continuous vulcanization method for small rubber rolls, which is fed from a tank. 2. A hot-air vulcanizing tank, a small rubber roll conveyor conveyed from the inlet to the outlet of the vulcanizing tank, a hot-beam irradiator provided along a ceiling near the inlet of the vulcanizing tank, and In order to scoop up and rotate the small rubber roll on the passing conveyor, a rubber roll rotation drive device having a plurality of pairs of drive shafts penetrating from both sides of the vulcanizing tank from the outside is provided, and each of the plurality of pairs of drive shafts has a conical tip. A continuous vulcanizing apparatus for a small rubber roll, characterized in that the rubber roll is provided at a height slightly floating above the conveyor when the both ends of the rubber roll are sandwiched between the concave sides of the rubber roll. 3. The apparatus according to claim 2, wherein the conveyor drive device stops while the rubber roll rotation drive device is picking up and rotating the roll.
A continuous vulcanizing device for small rubber rolls, wherein the rubber rolls are transported by intermittent driving which is performed when the rubber rolls are returned to the conveyor. 4. The apparatus according to claim 2, wherein said conveyor has a pair of parallel chains provided with a V-shaped attachment on which both shaft ends of a rubber roll are placed, and passes through the vulcanizing tank and circulates under the floor. Then, the distance between the two sides of the chain is adjusted by driving a space adjusting shaft along the outer wall of the vulcanizing tank, by rotating a screw shaft orthogonal to the adjusting shaft in the normal and reverse directions, and a pair of reciprocating reciprocations near the outlet and the inlet of the vulcanizing tank. A continuous vulcanizing device for small rubber rolls, wherein the distance between the chain guide blocks is adjusted. 5. The apparatus according to claim 2, wherein the rubber roll rotation driving device is opposed to both sides of the vulcanizing tank with the outer walls therebetween, and the rubber roll rotation driving device is disposed in front of and behind the plurality of pairs of driving shafts.
The two shaft support drive units in which the two bearings are aligned on the base frame and the bases of the drive units on both sides are extruded, and the tips of the drive shafts are pressed against both shaft ends of each rubber roll on the conveyor. A hydraulic cylinder for returning, and one of the drive units on both sides is provided with an extra long drive shaft and a vulcanizing tank on which the base frame is mounted in order to cope with a change in the length of the rubber roll to be vulcanized. A continuous vulcanizing apparatus for small rubber rolls, comprising: a moving table that moves toward and away from the outer wall.