JPH05318465A - Preparation of resin concrete - Google Patents

Abstract

PURPOSE:To decrease consumption of heat energy when a resin concrete is prepd. by mixing a heated aggregate and a thermoplastic resin material and melting the thermoplastic resin material with the aggregate heat. CONSTITUTION:A resin concrete manufacturing apparatus 10 has a heating means 12 for heating an aggregate and a mixing means 14 for mixing the aggregate and a thermoplastic resin material. The heating means 12 is pref. a heating oven. The heating oven 12 contains a cylindrical rotary trunk 16 and the aggregate fed in the rotary trunk 16 is heated by means of a flame of a burner 38 up to carbonizing or ignition temp. of a granular thermoplastic resin material. The mixing means 14 consists of a screw feeder and the inside is communicated with the inside of the rotary trunk 16 and is connected with a hopper 58 for feeding the thermoplastic resin material. The aggregate is brought into contact with the thermoplastic resin material in a screw feeder 14 and they are mixed and the thermoplastic resin is melted with heat of the aggregate to form a resin concrete.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for producing resin concrete, which is a mixed melt of an aggregate and a thermoplastic resin.

[0002]

2. Description of the Related Art Conventionally, resin concrete has a heating means for heating and melting a thermoplastic resin material and a mixing means for mixing the molten thermoplastic resin with an aggregate made of gravel or sand. It was manufactured using the manufacturing apparatus including.

[0003]

By the way, a thermoplastic resin material, for example, a granular thermoplastic resin material is carbonized at about 350.degree. From this, the thermoplastic resin material is melted in the heating means under a temperature environment of about 350 ° C. However, this temperature environment is obtained by converting a heating medium having a higher temperature into a heating medium having a lower temperature, so that heat energy is wasted. The carbonization temperature is about 3
Despite heating at 50 ° C., it took time to melt the thermoplastic resin material, and a large amount of heat energy was required. An object of the present invention is to reduce the consumption of heat energy during the production of resin concrete.

[0004]

[Means for Solving the Problems, Actions and Effects of the Invention]
An apparatus for producing resin concrete according to the present invention includes a heating means for heating an aggregate, and a mixing device for mixing the aggregate and the thermoplastic resin material. According to the present invention, in the heating means, the aggregate is heated to about 350 ° C. which is the carbonization decomposition temperature of the thermoplastic resin material, and in the mixing means, the heated aggregate and the thermoplastic resin material are added. The thermoplastic resin materials are melted by mixing and contacting with each other to obtain resin concrete which is a molten mixture of these. Since the aggregate does not carbonize, it can be heated with a high-temperature heating medium, which can reduce the consumption of heat energy required for heating. Further, since the melting of the thermoplastic resin material is due to the transfer of heat accompanying the contact with the heated aggregate, the consumption of heat energy can be made small.

By injecting a burner flame onto the aggregate and heating it, the thermal efficiency required for heating is maximized,
The consumption of heat energy can be minimized. If the mixing device is a screw feeder and the aggregate and the thermoplastic resin material can be respectively received on the upstream side and the downstream side in the feeding direction of the screw feeder, while receiving the rotational force and the feeding force of the screw. Mutual contact and mixing of the aggregate and the thermoplastic resin material can be performed.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIG. 1, a resin concrete manufacturing apparatus according to the present invention is shown generally by the numeral 10. The manufacturing apparatus 10 includes a heating means 12 for heating an aggregate (not shown) such as sand or gravel, and a mixing means for mixing the aggregate with a thermoplastic resin material such as polyethylene or polypropylene. 14 and. The mixing weight ratio of the aggregate and the thermoplastic resin is, for example, a road surface tile, a paving stone block, a flooring material, a roofing material, a frame forming material, a U-shaped groove forming material, a pipe, etc. In the case of using for, it is set to 100: 30-40.

The heating means 12 is preferably a heating furnace as shown in FIG. The heating furnace 12 is a cylindrical rotary drum 16
including. The rotary drum 16 is mounted on two pairs of rollers 20 mounted on a pair of pedestals 18 that are parallel to each other, and slightly (for example, 1 with respect to a horizontal plane) from one housing 26 to the other housing 28 described later. ~ At an angle of 2 degrees)
It is descending and sloping. The rotary drum 16 includes a pair of rollers 20.
Has a ring 22 in contact with. A sprocket 24 is attached to the rotary cylinder 16 for rotating the rotary cylinder 16 about its axis. The sprocket 24 is connected to a sprocket (not shown) fixed to an output shaft of a motor (not shown) via a chain (not shown). Instead of the rotary cylinder 16, it is possible to use a simple cylinder that does not rotate.

Both ends of the rotary cylinder 16 are respectively attached to a pair of mounts 18 and a pair of housings 26 and 28.
Extends inside. One housing 26 supports a screw feeder 30 penetrating the housing 26 in the lateral direction and a hopper 32 for the aggregate. The hopper 32 is further supported by the frame 33. The illustrated screw feeder 30 is composed of a casing 30a having a U-shaped cross section and a screw (not shown) inside the casing 30a. The lower end of the hopper 32 is connected to one end of the casing and communicates with the inside thereof. There is. The screw feeder 30 can convey the aggregate from one end to the other end.

The casing 30 of the screw feeder 30
The shaft portion of the screw protruding from one end portion of a is rotatably supported by the bearing device 34 supported by the pair of mounts 18. A sprocket 36 connected to a motor (not shown) via a chain (not shown) is attached to the tip of the shaft portion. On the other hand, the casing 30
The other end of a extends from one end of the rotary drum 16 to the inside thereof,
Further, it has an opening 30b that opens downward. Therefore, when the motor is operated, the aggregate in the hopper 32 is supplied into the rotary drum 16 via the screw feeder 30.

A burner 38 is attached to the other housing 26. The burner 38 is arranged on an extension of the axis of the rotary drum 16 and can emit a flame toward the inside of the rotary drum 16.

The aggregate supplied to the rotary drum 16 is intermittently radiated from the burner 38, preferably 700 to
It is heated by a flame of 800 ° C. The heating temperature of the aggregate is preferably set to 350 ° C. to 450 ° C., which is the carbonization or ignition temperature of the granular thermoplastic resin material.
During flame emission from the burner 38, the rotary drum 16 is rotated at, for example, 60 rpm by the operation of the motor so that the aggregate is uniformly heated. Rotating body 1
Since 6 is slightly inclined, the inside of the aggregate moves from one end side to the other end side of the rotary drum 16 during its rotation.

Further, a plurality of scooping plates (not shown) for scooping up the aggregate are arranged on the inner peripheral surface of the rotary drum 16 at intervals in the circumferential direction and the axial direction. The arrangement position of the scooping plate is indicated by a + mark in FIG. Each scooping plate may be a simple flat plate, but is a plate member bent in a U shape, one end of which is fixed to the inner peripheral surface of the rotary drum 16 and the other end of which is directed toward the axis of the rotary drum 16. It is desirable that the plate member is arranged so as to be formed. According to this, the rotary drum 1
During the rotational movement of 6, the aggregate can be held at the other end of the plate member for a long time and dropped from a high place. The aggregate is heated more uniformly during the fall. Therefore, the heating efficiency of the aggregate is further enhanced.

The mixing means 14 is, in the illustrated example, the rotary cylinder 1.
6, a casing 40 having a U-shaped cross-sectional shape, which is formed by a screw feeder extending orthogonally thereto, a screw 42 arranged in the casing 40 and rotatably supported, and an open top surface of the casing 40. And a lid member 44 for closing. One end 14a of the screw feeder 14
Is connected to the housing 28 on the other end side of the rotary drum 16 via a tubular connecting member 46, and the inside of the screw feeder 14 and the inside of the rotary drum 16 communicate with each other. The housing 28 has a conical guide surface 29 continuous with the connecting member 46, and the aggregate heated in the rotary drum 16 is
It falls through the guide surface 29 of the housing 28 and the connecting member 46 into the screw feeder 14.

A sprocket 48 is fixed to the shaft of the screw 42, which projects from the other end of the screw feeder 14. In addition, a motor 52 is installed on the other end through a base 50 fixed to the lid member 44. A sprocket 54 is attached to the drive shaft of the motor 52. The rotational force of the motor 52 causes both sprockets 48, 5
It is transmitted to the screw 42 via a chain 56 that goes around the four. Therefore, the heated aggregate is fed from one end of the screw feeder 14 toward the other end.

The screw feeder 14 is also connected with a hopper 58 for guiding the granular thermoplastic resin material to the screw feeder. More specifically,
One end of a screw feeder 60 similar to the screw feeder 14 is connected to the lower end of the hopper 58, and the other end of the screw feeder 60 is connected to the connecting member 62 similar to the connecting member 46.
Is attached. The connecting member 62 is the connecting member 4 with respect to the feeding direction of the screw feeder 14 which is a mixing means.
6 is arranged on the downstream side.

Therefore, when the thermoplastic resin material is fed into the screw feeder 14 while the heated aggregate is being fed through the screw feeder 14 from one end to the other end, the aggregate and the Both of the thermoplastic resin materials come into contact with each other as the screw 42 rotates and are mixed. During this time, the thermoplastic resin material receives heat from the aggregate and is melted. As a result, resin concrete, which is a mixture of the aggregate and the molten thermoplastic resin material, is formed. The temperature of the mixture is preferably 250 to 300 ° C. In order to prevent the temperature of the mixture from decreasing, a heater (not shown) may be embedded inside the casing 40 of the screw feeder 14.

In the illustrated example, a screw feeder 64 is provided to further continue the mixing of the mixture. The screw feeder 64 extends below the screw feeder 14 in a direction orthogonal to the screw feeder 14, and one end of the screw feeder 64 is connected to the other end 14 b of the screw feeder 14 via a connecting member 66.
It is connected to the. By continuing the kneading by the screw feeder 64, the distribution of the aggregate in the mixture can be made more uniform.

The resin concrete distributor 68 is connected to the other end of the screw feeder 64. The distributor 68 stores a predetermined amount of the resin concrete from the screw feeder 64 and drops it toward a molding die (not shown) below. The distributor 68 has at its lower end a discharge opening 70 for the resin concrete and a pair of doors 72 for opening and closing the discharge opening. Each door is opened and closed by a hydraulic jack 74 having opposite ends pivotally attached to the door and the outer wall of the distributor 68.

In the application of the apparatus of the present invention, as the aggregate, not only unused sand and gravel but also sand and gravel obtained from wastes of asphalt concrete and cement concrete can be used. As the thermoplastic resin material, not only an unused material but also a crushed material of a waste thermoplastic resin can be used.

As the above-mentioned cru feeder, one having a casing made of a tube may be used instead of the illustrated example.

[Brief description of drawings]

FIG. 1 is a front view of an apparatus for producing resin concrete according to the present invention.

FIG. 2 is a front view of heating means.

[Explanation of symbols]

 10 Resin Concrete Manufacturing Equipment 12 Heating Means 14 Mixing Means 38 Burners

Claims (3)

[Claims] 1. An apparatus for producing resin concrete, comprising: heating means for heating an aggregate; and mixing means for mixing the aggregate and a thermoplastic resin material. 2. The apparatus according to claim 1, wherein the heating means comprises a heating furnace equipped with a burner. 3. The mixing means comprises a screw feeder, and the screw feeder can receive the aggregate and the thermoplastic resin material on the upstream side and the downstream side with respect to the feeding direction, respectively. apparatus.