JP3405595B2 - Disassembly method of metal / rubber composite - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal and rubber, such as a cushion tire used for running a rice transplanter or a construction machine used for soft soil or muddy ground. The present invention relates to a method for disassembling a metal / rubber composite which can be easily separated into metal and rubber after use, and which can reuse metal materials. 2. Description of the Related Art In recent years, in a rice transplanter a in a paddy field as shown in FIG. 3, and in a small civil engineering construction machine used in soft soil or swamp, a cushion tire as shown in FIG. You. As shown in FIG. 2, a cushion tire k is formed by coating a rubber g forming a tire tread on the outside of a hollow annular metal core s made of metal, and adhering and integrating with the metal core s. When such a cushion tire is used and then disposed of, it is conventionally burned in an incinerator, and the rubber portion is burned, and the core metal remaining after incineration is collected or cut and disposed of by landfill. The method was used. [0005] However, if a cushion tire is to be incinerated, all rubber parts must be burned, which requires enormous heat energy and a great deal of time. In addition, burning the rubber pollutes the environment, such as generating a large amount of harmful gas, and increases costs. Therefore, the used cushion tire has conventionally had to be cut into a plurality of pieces and then landfilled. However, as the quantity increases, the disposal itself will be limited. [0007] The present invention, <br/> metal of the used cushion tires, rubber composite as basic to high frequency induction heating, the metal parts can be easily taken out, a metal capable of solving the above problems, It aims to provide a method for dismantling a rubber composite. Means for Solving the Problems The invention according to claim 1 is:
Rubber is applied to the outside of the annular reinforcing core via an adhesive layer.
Cussi having a rubber substrate composed of a covered metal-rubber composite
The rubber base of the tire, the core, and the rubber
Separating the metal, a method of disassembling the rubber composite, the
Attach the cushion tire to the rotating device so that it can rotate
And an induction coil having a shape suitable for induction heating the core body, and a high frequency of 10 kHz to 3 MHz
heating the core through the induction coil by the high frequency induction heating device which can be output at an output power of W～50kw, the adhesive layer breaking step to destroy the adhesive layer between the rubber and the core, the
In the bonding layer breaking step, the metal rubber composite is rotated.
Rotation that destroys the adhesive layer between rubber and core over the entire circumference
Process and hot heated by induction coil
Using a knife, the entire circumference of one side of the rubber substrate is
And a rubber is used as a starting point
A method for disassembling a metal / rubber composite, comprising a step of peeling from a metal / rubber composite. When a high-frequency alternating current is applied to an induction coil disposed in close proximity to a metal / rubber composite, the metal portion, which is a conductor, is formed by a magnetic field generated by the induction coil. Induced current flows through. The metal part is heated by Joule heat loss due to the generated induced current. On the other hand, no induced current is generated because rubber is not a conductor. When the core receives a high-frequency current of 10 kHz to 3 MHz, a skin effect peculiar to the high-frequency current appears, and the current flows intensively in a thin layer portion on the surface of the core. The body is heated and the temperature rises. When the temperature of the core increases as described above, a part of the heat is transferred to the rubber through the adhesive layer between the core and the rubber. The rubber has the highest temperature in the adhesive layer bonded to the core. The heat resistance of the adhesive for bonding between rubber and metal is about 200 ° C., and the adhesive layer is decomposed and broken by the induction heating of the metal part, so that the adhesive force between the two is reduced. It is remarkably reduced, and the rubber and the metal are easily separated. In the present invention, the induction frequency is 10 kHz.
z to 3 MHz. If it is less than 10 kHz, the time required for heating is long, and if it exceeds 3 MHz, it enters the band regulated by the Radio Law and its implementation is restricted. In order to perform economical heating, the frequency is preferably 50 kHz or less. The output power of the high-frequency induction heating device is set to 500
w to 50 kW. If it is less than 500 watts, it will not be heated effectively in a short time and work efficiency will be inferior.If it exceeds 50 kw, power consumption will be large, equipment will be large, and the cost of dismantling will be increased, such as requiring a large cooling device. This is because In order to perform effective heating, the output power is preferably 5 kW or more. As described above, the adhesive layer breaking step in the present invention is a method of heating the core by electromagnetic induction.
The adhesive layer closest to the rubber core can be destroyed by heating only the core. Therefore, the loss of heat required for destruction is extremely small, and the generation of harmful gas is small as in the conventional method of baking the entire rubber composite, whereby the working environment can be enhanced and the adhesive layer can be efficiently destroyed. The separating step is a step in which a cut is formed in the rubber in advance with a hot knife utilizing induction heating and the core is drawn out from the cut, and thus has a structure in which a majority of the core is covered with the rubber. Even if there is a cut, the separation operation can be performed very easily. As described above, according to the method of the present invention, in a metal / rubber composite, metal and rubber can be easily separated without lowering the working environment. The core metal can be efficiently removed from the used cushion tire. An embodiment of the present invention will now be described with reference to a metal-rubber composite.
The case of a cushion tire will be described with reference to the drawings. Prior to the disassembly method, the structure of the cushion tire 1A will be described. As shown in FIGS. 2 and 3, the cushion tire 1A includes a tire base 11 forming a tread portion and a rim portion 12 holding the tire base 11. The tire base 11 includes a core 2 formed of a hollow body having an annular shape and a rectangular cross section, and rubber 3 covering substantially the entire surface of the core 2 and having an outer peripheral surface forming a tread surface 11A. The rubber 3 is made of a rubber composition having enhanced abrasion resistance, and is bonded and integrated with the core 2 by using an adhesive, and the rubber 3 has an adhesive layer 4 at a boundary portion with the core 2. It is formed. The tread surface 11A is provided with triangular protrusions 15 arranged at substantially equal intervals in the circumferential direction and rising outward in the radial direction. This projection 15
Is useful for improving grip when traveling on soft soil such as muddy soil. The core 2 is a steel tube having a rectangular cross section in this embodiment, and its inward facing surface and the cushion tire 1
A boss 1 disposed at the center of A and having a shaft hole 16a at the center
6 are connected by a plurality of rims 17. The high-frequency heating apparatus 6, as shown in FIG. 1 (A), the high frequency i which enter the commercial power, and outputs the high-frequency power
A converter 21, a high frequency transformer 22 which transforms the output from the high-frequency inverter 21 is a device well known construction comprising an induction coil 5 connected to the high frequency transformer 22. In this embodiment, the induction coil 5 is formed so as to be closest to the core body. In this embodiment, the induction coil 5 follows the shape of one side surface of the tire base 11 as shown in FIG. It is formed by one coil 5A that is bent and the other coil 5B that is bent along the shape of the other side surface. On the other hand, the other coils 5A and 5B are formed by bending a wire made of copper because a large current flows therethrough, and both ends thereof are connected to the high-frequency transformer 22. Each of the coils may be formed of a tube, and cooling water may be passed through the tube to perform cooling after heating. Accordingly, when the induction coil 5 is set on the cushion tire 1A as described above, and the induction coil 5 is energized, the high-frequency current flowing through the induction coil 5 generates a magnetic field centered on the coil, and the magnetic field is generated by the rubber. 3 to induce an induced current in the core body 2. When the induced current passes through the surface layer of the core 2, the temperature of the surface rises in a short time, the heat is transferred to the rubber 2, and the adhesion layer between the rubber 2 and the core 2 is formed. 4 is heated to break the adhesive layer 4 and remove the bonding force between the two. In this embodiment, the cushion tire 1A
A rotating device 7 is provided which can rotate the cushion tire 1A continuously about its tire axis during high frequency heating of the cushion tire 1A. The rotation device 7 is a reduction motor M as shown in FIG. 1 (A).
4 are provided. Accordingly, by mounting the cushion tire 1A around the output shaft so as to be able to rotate therewith and driving the reduction gear M, the cushion tire 1A rotates about the tire shaft. By supplying electricity to the induction coil 5 in such a state, the position to be heated in the tire base 11 moves sequentially in the circumferential direction, so that the entire tire base 11 can be heated. By providing the rotation step of heating the cushion tire 1A while rotating, the output current of the high-frequency induction heating device can be reduced, and the adhesive layer breaking step can be more economically processed. In the separation step, as shown in FIG. 1 (B), the tire is placed at a position where the distance between the surface of the rubber 3 and the adhesive layer 4 is the shortest by using a hot knife F previously heated by an induction coil. Cuts 9 and 9 are provided on one and the other side of the base 11 at the same time. The cut 9 may be a continuous cut or may be provided intermittently. A notch can be formed by using the hot knife F while continuously rotating the cushion tire 1A using the above-described rotating device M or a rotating tool having substantially the same configuration as the rotating device M. By providing such cuts 9, the majority of the surface of the core 2 is covered with the rubber 3, and an adhesive layer is formed at the joint between the surface of the core 2 and the rubber 3. Also, as shown in FIG. 5, the core 2 can be easily removed from the rubber 3 with the cut 9 as a starting point. As described above, according to the present invention, the core of a metal / rubber composite is heated through an induction coil of a high-frequency induction heating device for outputting high frequency, and the rubber and the core are bonded to each other. Includes an adhesive layer breaking step of breaking the layer and a separation step of making a cut and extracting the core from this cut, so that less heat energy is required and work is simpler than in the conventional method of burning the whole. Therefore, it can be economically dismantled and does not lower the working environment, and can be suitably used for dismantling a cushion tire having a cored bar embedded therein.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially sectional front view showing one embodiment of the present invention, wherein (A) shows an adhesive layer breaking step, and (B) shows a separation step. FIG. 2 is a partially enlarged sectional view showing a cushion tire. FIG. 3 is a front view showing an example of using a cushion tire. FIG. 4 is a perspective view illustrating an induction coil. FIG. 5 is a sectional view showing a state after disassembly. [Description of Signs] 1, 1A Metal / rubber composite 2 Core 3 Rubber 4 Adhesive layer 5 Induction coil 6 High frequency induction heating device 9 Cut

Continuation of front page (56) References JP-A-52-114681 (JP, A) JP-A-2-202406 (JP, A) JP-A-5-131449 (JP, A) JP-A-7-117742 (JP) , A) JP-A-7-299821 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29B 17/00-17/02 B09B 3/00-5/00

Claims (1)

(57) [Claims 1] An adhesive layer is provided outside the annular reinforcing core.
To form a rubber base consisting of a metal-rubber composite coated with rubber.
The rubber base of the cushion tire having the core body
For separating metal and rubber composites into rubber and the rubber
A is, the cushion tires, can be mounted to rotate by the rotation device
And an induction coil having a shape suitable for induction heating of the core body, and a high frequency of 10 kHz to 3 MHz is supplied to 500 w to 50 k
An adhesive layer breaking step of heating the core through the induction coil by a high frequency induction heating device capable of outputting with the output power of w to break the adhesive layer between the rubber and the core, and the adhesive layer breaking step, Rotating the metal-rubber composite
Thereby destroying the adhesive layer between the rubber and the core over the entire circumference
A rotating step, and using a hot knife heated by an induction coil ,
A cut is made on one side and the other side of the
And the rubber is peeled from the core starting from the cut.
A method for disassembling a metal / rubber composite, comprising the steps of: