JPH06210633A - Reclaming device for waste vulcanized rubber - Google Patents

Abstract

PURPOSE:To obtain the title device heating ground waste vulcanized rubber to desulfurization temp. by a mechanical heating means to depolymerize the same. CONSTITUTION:The shearing heating part 59 provided to a mechanical heating means 51 heats ground waste from the outside thereof by a high frequency induction heating means 69 and the charged ground waste vulcanized rubber is heated to desulfurization temp. in the shearing heating part 59 by mechanical heating and induction heating to be depolymerized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for recycling waste vulcanized rubber, in which a mechanical heating means of a screw extruder is provided with heating means such as high frequency induction heating to heat the vulcanized rubber to a desulfurization temperature. Regarding a device for reproducing.

[0002]

2. Description of the Related Art An example of a conventional recycling device for waste vulcanized rubber is shown in FIG. After the type of waste vulcanized rubber in the raw material 11 is selected in the selection step 12, it is pulverized in the pulverization step 13 by a pulverizer, and the powder vulcanized rubber requires a rubber processing oil or a regenerant in the blending and mixing step 14. Add and mix according to the formula. Note that rubber that does not require this step is directly put into the microwave heating step 15 as a powder.

Then, in the microwave heating step 15, the powdered vulcanized rubber is desulfurized into a partially decomposed polymerization state.
In this microwave heating step 15, a combustion type deodorizing device 16
Is connected, and the deodorizing device 16 deodorizes the malodorous gas generated by heating during the desulfurization process. Then, the temperature of a part of the heated air generated by this deodorization treatment is adjusted to near the optimum desulfurization temperature of the vulcanized rubber to be desulfurized, and it is used as the heated air necessary for desulfurization, and the rest is exhausted to the outside. .

Therefore, in the microwave heating step 15, the powder vulcanized rubber is heated by both the microwave energy and the above-mentioned heated air, so that the powder vulcanized rubber is efficiently brought into a partially decomposed polymerization state. Then, the rubber in the partially decomposed polymerization state is subjected to friction heat generation by an extruder or the like equipped with the mechanical heat generation means 17 to generate heat and accelerate depolymerization. The rubber thus desulfurized is sufficiently plasticized and continuously discharged from the mechanical heat generating means 17.

Then, immediately in the cooling step 18, it is cooled,
In the refining step 19, a recycled rubber product 20 is obtained by refining with a roll machine or the like. While the mechanical heat generating means 17 promotes plasticization to accelerate desulfurization, a large amount of malodorous gas is generated. Therefore, as in the microwave heating step 15, this malodorous gas is passed to the combustion type deodorizing device 16 for deodorization. It is processed.

[0006]

In the conventional vulcanized rubber recycling apparatus described above, microwave energy and heated air are simultaneously applied in the microwave heating step 15 to rapidly and partially decompose the powdered vulcanized rubber. In this state, the mechanical heat generating means 17 further applies shearing and frictional heat to generate heat to cause depolymerization, so that heat is effectively and efficiently generated. Further, since a large amount of malodorous gas generated in the desulfurization process is deodorized and part of the deodorized heated air is used as a heat source, it is an effective and non-polluting method, which is an industrially extremely advantageous method. .

However, since this reproducing apparatus requires the microwave heating step 15 and the mechanical heat generating means 17, the reproducing apparatus for carrying out the apparatus becomes large and the cost becomes high.

In view of the above situation, the present invention aims to develop an industrially advantageous recycling apparatus for waste vulcanized rubber which can be implemented by a simple recycling apparatus and is excellent in production efficiency.

[0009]

In order to achieve the above object, in the present invention, as a first invention, a pulverized product of waste vulcanized rubber is desulfurized at a desulfurization temperature by a screw extruder provided with a mechanical heating means. A waste vulcanized rubber recycling apparatus that heats up and regenerates a waste vulcanized rubber that is provided with heating means such as high-frequency induction heating that raises the temperature of the vulcanized rubber from the outside of the mechanical heat generating means and maintains the temperature. We propose a vulcanized rubber recycling device.

As a second invention, a waste vulcanized rubber recycling apparatus is proposed, in which the desulfurization temperature of the vulcanized rubber is adjusted and controlled according to the ambient temperature or the internal temperature of the mechanical heating means. To do.

A third aspect of the present invention is characterized in that the desulfurization temperature of the vulcanized rubber is adjusted and controlled in accordance with the temperature of the desulfurized rubber obtained by the mechanical heat generating means. Suggest a device.

As a fourth aspect of the invention, there is proposed a device for recycling waste vulcanized rubber, characterized in that the desulfurized rubber obtained by the mechanical heat generating means is immediately cooled by a water cooling device.

As a fifth aspect of the invention, there is provided a device for recycling waste vulcanized rubber, characterized in that the desulfurized rubber obtained by the mechanical heating means is cut into a length of an appropriate size by a cutting device. suggest.

As a sixth invention, a waste vulcanized rubber recycling apparatus is proposed in which a malodorous gas generated by heating of the mechanical heat generating means is deodorized by a combustion type deodorizing apparatus.

[0015]

According to the first aspect of the present invention, the powder vulcanized rubber is put in the heat generating portion of the mechanical heat generating means, and the mechanical heat generating means and the outside of the mechanical heat generating means are heated and desulfurized by heating means such as high frequency induction heating. Therefore, it is not necessary to provide a high-cost microwave heating process, and the regenerating apparatus to be implemented is also compact.

The second invention is such that the desulfurization temperature at the time of desulfurizing the powdered vulcanized rubber by the mechanical heat generating means is adjusted and controlled by the ambient temperature of the mechanical heat generating means or the internal temperature thereof. As a result, the powdered vulcanized rubber is discharged from the mechanical heat generating means in a proper desulfurized state, and becomes a good quality regenerated rubber product.

A third aspect of the present invention adjusts and controls the desulfurization temperature of the powdered vulcanized rubber according to the temperature of the rubber discharged from the mechanical heat generating means. Is obtained.

According to a fourth aspect of the present invention, the rubber discharged from the mechanical heat generating means is immediately cooled with water. This prevents the progress of the chemical reaction, so that a stable recycled rubber can be obtained. Moreover, the generation of foul-smelling gas is extremely suppressed,
The deodorizing means will also be simple, and the playback device will be compact and excellent in energy saving.

According to the fifth aspect of the invention, the vulcanized rubber is cut into an appropriate length, so that the cooling effect is improved and the subsequent processes such as weighing and refining are easy to handle.

According to a sixth aspect of the present invention, the malodorous gas generated by the heating of the mechanical heat generating means is deodorized by the combustion type deodorizing means, which makes the reproducing apparatus excellent in terms of pollution.

[0021]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a block diagram showing a reproducing process of the reproducing apparatus according to the present invention. In the description of the present embodiment, parts corresponding to those of the reproducing process of the conventional example are designated by the same reference numerals, and the description thereof will be omitted. .

The crushed vulcanized rubber depends on the type of rubber, but rubber processing oil or a regenerant is added if necessary,
The mixture is mixed in the mixing and mixing step 14 and put into a screw-extruding device 51 provided as a mechanical heat generating means.
The vulcanized rubber that does not require this step is put into the screw-extruding device 51 while being crushed.

The vulcanized rubber charged is heated by the screw-extruding device 51 until it is desulfurized, sufficiently plasticized and discharged from the extruding device 51.

Further, a combustion type deodorizing device 52 is connected to the screw-extruding device 51, and the malodorous gas generated by heating during the desulfurization process is deodorized by the deodorizing device 52 and released to the outside air. Since the processing gas after the deodorizing process has a considerably high temperature, it can be used, for example, as heat energy for returning to the mixing and mixing step 14 and residual heat.

The above-mentioned screw-extruding apparatus 51 can be desulfurized by linearly heating it to a temperature of about 180 ° C. to 450 ° C. to cause a depolymerization reaction in a short time, depending on the type of rubber to be treated. Is. The desulfurized rubber is cooled in a cooling step 18, and then, if necessary, a refining step 19 is performed to obtain a recycled rubber 53.

When the depolymerized rubber is heated to the desulfurization temperature and cooled, the chemical reaction gradually progresses due to the heat accumulated in the rubber, self-heating occurs, and in some cases carbonization or ignition due to overheating is caused. It is possible to prevent this, obtain a stable recycled rubber, and suppress the generation of offensive odor gas.

Therefore, in the cooling step 18, the rubber discharged from the mechanical heating means 51 is immediately cooled with water. As a result, the chemical reaction of the rubber is stopped, and the malodorous gas generated from the rubber is also suppressed and prevented.

Next, a cooling step 18 is performed as a mechanical heat generating means for implementing the apparatus for recycling waste vulcanized rubber according to the present invention.
FIG. 2 shows a screw-extruding apparatus 51 including the above.

The screw-extruding device 51 comprises a cylinder-5.
4 is composed of a transfer section 56 having a transfer screw 55 and a shearing heat generating section 59 having a rotating body 58 in the cylinder 57 connected to the transfer section 56. The screw 55 is a speed reducer. After passing through 60, it is rotated by the motor 61.

Further, the cylinder 54 of the transfer section 56 is provided with
A feeder 62 for supplying a fixed amount of pulverized vulcanized rubber is attached. The rotating body 58 is a cylinder of the shear heating unit 59.
It is fixed to the tip of the screw 55 that has entered the inside of the screw 57 and rotates integrally with the screw 55.

The rotating body 58 has a compression portion 63 whose diameter is increased toward the tip of the shear heating portion 59 and a cylinder.
The shearing portion 64 has a diameter slightly smaller than the inner diameter of 57, and a large number of ridges 63a are formed on the surface of the compressing portion 63 with a gentle inclination. Further, a contact type temperature sensor 65 is fixed to a part of the outer circumference of the cylinder 57 of the shear heating section 59, specifically, near the cylinder of the shear section 64. Further, the cylinder 57 is adapted to be heated from the outside by heating means.

As the heating means, a high frequency induction heating means 69 having excellent control responsiveness is used. Although this is the most suitable means, it should be constructed such that it is heated by an electric heater or the like. You can also

The tip of the cylinder 57 is a discharge port 66, and the rubber discharged from the discharge port 66 is cooled by water ejected from a cooling nozzle 68 installed in the discharge port cover 67. It The odorous gas generated when the rubber is discharged is guided to the deodorizing device 52 by a duct provided in a part of the discharge port cover 67.

The crushed rubber is continuously charged into the transfer section 56 from the constant quantity feeder 62, and is sequentially pushed toward the shear heating section 59 by the rotation of the rotating screw 55. The vulcanized rubber pushed into the shear heat generating portion 59 is transferred to the discharge port 66 by the action of the rotating body 58, while the vulcanized rubber is rapidly ablated by frictional heat generated by the rotation of the cylinder 57 and the shearing portion 64. Fever.

Further, since the cylinder 57 is heated to the desulfurization temperature (180 ° C. to 450 ° C.) by the above heating means 69, the rubber filled in the slight gap between the cylinder 57 and the shearing portion 64 is While being transferred to the discharge port 66 by the feeding action of the rotating body 58, heat is efficiently absorbed from the cylinder 57 to raise the temperature to a predetermined desulfurization temperature to cause a depolymerization reaction.

The heating means 69 is adapted to heat the cylinder 57 at a predetermined temperature depending on the type of rubber and the degree of desulfurization. As a result, the fully plasticized desulfurized rubber is continuously extruded according to the shape of the discharge port 66.

The desulfurized rubber which is continuously extruded is immediately cooled by the water jetted from the cooling nozzle 68 installed in the discharge port cover 67 and taken out by the take-out conveyor 71. Furthermore, after being drained and dried, refined and refined by a finishing roll machine, recycled rubber product 53
Becomes

If the desulfurized rubber continuously extruded from the discharge port 66 is cooled and cut into a certain length by a cutting device 70 such as a rotary cutter, the cooling effect is improved and the physical properties are improved. It has the advantages of being stable and being easy to handle in the subsequent steps such as weighing and refining. The cutting device 70 is
It is driven by the motor 70a.

When promoting the desulfurization by promoting plasticization in the mechanical heat generating means, the desulfurization temperature of the vulcanized rubber is controlled by the rotation speed of the rotor 58 and the temperature of the cylinder-57 of the shear heat generating portion 59. It

That is, the calorific value of the vulcanized rubber is determined by the shearing part 6
4 is determined by the length L, the rotational speed of the rotating body 58, and the temperature of the cylinder-57. For example, as shown in FIG. 3 as an example, in the case of vulcanized rubber having an optimum desulfurization temperature of 400 ° C.,
When the length L of the shearing portion 64 is 50 mm, the cylinder 57 is heated to 400 ° C., and the rotation speed of the rotating body 58, that is, the screw rotation speed is 90 rpm, the optimum desulfurization temperature is about 3 minutes. To reach. In FIG. 3, a curve A shows the cylinder temperature, and a curve B shows the rubber temperature.

In this way, the temperature of the cylinder 57 detects whether or not the rubber to be desulfurized has an appropriate temperature (appropriate desulfurization) during desulfurization. That is, the temperature sensor 65 provided in the cylinder-57 detects the temperature of the cylinder-57.

A power supply (not shown) of the heating means 69 is automatically controlled by this detection signal to keep the temperature of the cylinder 57 at a predetermined temperature at all times, and the motor 61 is rotated in accordance with this detection signal. The rubber temperature is adjusted so that the rotational speed of the rotating body 58 is controlled by changing the number and the reproduction condition is favorable. It should be noted that a more stable regenerated rubber can be obtained by performing signal processing in the comparison calculation unit 72 and automatically controlling the number of revolutions.

The temperature sensor 65 measures the temperature of the outer peripheral surface of the cylinder 57, but measures the inner peripheral surface temperature of the cylinder 57 or the internal temperature of the cylinder 57. Good.

A large amount of gas is generated in the discharge port cover 67 by the desulfurized rubber continuously discharged from the discharge port 66. The malodorous gas is sent to the deodorizing device 52 by an exhaust fan (not shown) via an exhaust duct attached to a part of the cover 67.

The deodorizing device 52 has a well-known structure, and can emit a bad smell gas at a high temperature of 500 ° C. or higher (preferably 550 to 570)
Instantly burn by directly contacting with a flame that burns at (° C).
The fuel of the deodorizing device 52 is heavy oil, kerosene, LPG, LN.
A gas such as G is used.

When the contact time is preferably in the range of 0.3 to 1 second, oil, hydrogen sulfide, nitrogen, chlorine, aldehyde, etc. contained in the malodorous gas can be reliably burned and decomposed. The heated air deodorized as described above is discharged to the outside through the exhaust duct.

In the vulcanized rubber recycling apparatus described above, the desulfurization temperature of the vulcanized rubber is controlled by the temperature of the cylinder 57 of the shear heating section 59, but the recycled rubber extruded from the discharge port 66 of the shear heating section 59. It can also be controlled by the temperature of.

In this case, the temperature of the desulfurized rubber is directly measured by the contact type temperature sensor 73 provided inside the discharge port 66 so as to come into contact with the desulfurized rubber, and the measurement signal is processed by the comparison operation unit 72. Change the rotation speed of the motor 61,
The rotation of the rotating body 58 is automatically controlled.

As described above, the rubber desulfurized by the shear heat generating portion 59 and extruded from the discharge port 66 is left as it is, an oxidation reaction proceeds due to the heat of the heated rubber, and self-heating causes thermal decomposition, carbonization or Since it causes ignition, it is cooled by the water sprayed from the spray nozzle 68 provided in the discharge port cover 67.

Depending on the type of rubber, this oxidation reaction is 1
Almost no progress occurs if the temperature is lowered to about 50 ° C to 200 ° C. Further, if the temperature of the water attached to the rubber surface after cooling is 100 ° C. or higher, all of the water vaporizes, so the preferable cooling temperature is 150 ° C. to 200 ° C. This temperature can be adjusted by the amount of water jetted from the jet nozzle 68, the number of nozzles, and the length of rubber to be cut.

The cooled desulfurized rubber is taken out by the take-out conveyor 72, and in this process, it is drained and dried.

[0052]

As described above, in the apparatus for reclaiming waste vulcanized rubber according to the present invention, the shear heat generating portion provided in the mechanical heat generating means is heated from the outside and the waste rubber injected into the mechanical heat generating means is treated. Since the pulverized vulcanized rubber is heated to the desulfurization temperature, the desulfurization of the vulcanized rubber, which was conventionally performed in both the microwave heating step and the mechanical heating means, can be performed only by the mechanical heating means. Excellent in production efficiency, and
It becomes an economical regenerator because a costly microwave heating device is unnecessary.

[Brief description of drawings]

FIG. 1 is a block diagram showing an operation of a reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic vertical sectional side view of a screw-extruding device showing an example of a mechanical heat generating means.

FIG. 3 is a diagram for explaining a temperature rising state of vulcanized rubber.

FIG. 4 is a block diagram for explaining a conventional vulcanized rubber recycling apparatus.

[Explanation of symbols]

 51 Screw Extruder 52 Combustion Deodorizer 54 Cylinder 55 Screw 56 Transfer Part 57 Cylinder 58 Rotator 59 Shear Heater 60 Reducer 61 Motor 62 Feeder 65 Temperature Sensor 68 Injection Nozzle 69 High Frequency Induction Heating Means 70 cutting device

Claims (6)

[Claims] 1. A recycling device for waste vulcanized rubber, wherein a pulverized product of waste vulcanized rubber is heated to a desulfurization temperature and regenerated by a screw extruder provided with a mechanical heat generating means, the outside of the mechanical heat generating means. An apparatus for reclaiming waste vulcanized rubber, comprising heating means such as high-frequency induction heating for raising the temperature of the vulcanized rubber and maintaining the temperature. 2. The recycling of waste vulcanized rubber according to claim 1, wherein the desulfurization temperature of the vulcanized rubber is adjusted and controlled according to the ambient temperature or the internal temperature of the mechanical heating means. apparatus. 3. The waste vulcanization according to claim 1, wherein the desulfurization temperature of the vulcanized rubber is adjusted and controlled according to the temperature of the desulfurized rubber obtained by the mechanical heating means. Rubber recycling equipment. 4. The apparatus for recycling waste vulcanized rubber according to claim 1, wherein the desulfurized rubber obtained by the mechanical heat generating means is immediately cooled by a water cooling device. 5. The waste vulcanized rubber according to claim 1, wherein the desulfurized rubber obtained by the mechanical heating means is cut into a length of an appropriate size by a cutting device. Playback device. 6. The apparatus for recycling waste vulcanized rubber according to claim 1, wherein a malodorous gas generated by heating the mechanical heat generating means is deodorized by a combustion type deodorizing device.