KR101699660B1 - Injection apparatus of resin compound with weight body - Google Patents

Abstract

The present invention relates to an injection apparatus for a synthetic blend containing a weight body for adding a sense of weight to a synthetic resin. More particularly, the injection apparatus according to the present invention comprises a blender for blending a synthetic resin with a weight body and an injector for carrying out injection molding of the synthetic resin and weight body blended in the blender. The blender comprises: a blending tank having an inner space in which the synthetic resin and weight body supplied thereto are mixed with each other; and a pair of metering tanks for supplying a predetermined amount of synthetic resin and weight body to the blending tanks. The injector comprises: an extrusion heating section for heating and melting the synthetic resin and weight body blended at a predetermined ratio; and a molding section for molding the synthetic resin and weight body molten in the extrusion heating section are molded in a mold. According to the present invention, eco-friendly materials and regenerated energy sources are used for carrying out injection molding to decrease the production time and to increase the productivity, as compared to the conventional extrusion/injection method including introduction of mortar. In addition, the injection apparatus according to the present invention simplifies processing steps to reduce the labor cost, and reduces defects to improve the quality of products. Further, when defects are generated, the processed materials are pulverized and reused to ensure cost efficiency by virtue of the reduction of cost required for waste treatment and raw materials.

Description

Description of the Related Art [0002] Injection apparatus of a resin compound with a weight body,

The present invention relates to a synthetic resin mixed material injection apparatus including a specific gravity, and more particularly to a mixer for mixing a synthetic resin and a non-gravity body, and a non-gravity body composed of a synthetic resin mixed in the mixer and a molding machine for injection- To a synthetic resin mixed material injection apparatus.

Counterweight, which generally balances weight, has a balance weight produced by extrusion method with concrete as its main material and a counter balance manufactured by casting using metal.

These conventional manufacturing methods are poor in productivity, high production cost due to high cost raw materials, and products that are manufactured and sold in the market are also detected as harmful substances.

Therefore, it is expected to produce products such as balance weights as materials suitable for harmful substances according to the weather and conditions, which are excellent in durability and chemical resistance, can withstand high temperatures, and are suitable for climate and conditions.

The balance weight of the balance weight is used in household appliances such as washing machines and dishwashers. Counter balance is used for elevators, cranes, forklifts and other heavy equipment, and is used in construction, building materials (brick, pavement block, tile, Aquaculture, aquaculture, and so on).

These balance weights and counter balances include non-weights.

Specific gravity is added to give weight to synthetic resin products.

In addition, the motive of the green industry is to develop and distribute substitute materials for waste resources, thereby reducing the amount of waste materials used in various industries and reducing emissions, thereby reducing environmental protection policies and enormous disposal costs in the national and industrial sectors .

First, according to the data of industrial waste in 2014 (refer to Korea Environment & Resources Corporation), about 80% of concrete wastes are waste.

Therefore, this technology is to produce and supply substitute materials as substitutes for concrete.

Second, 'renewable energy resources' should be utilized among the green industry titles.

The raw materials and renewable energy resources of this technology (iron sludge discarded in the iron ore industry, various plastic resins (PP, PE, PC) discarded in the plastics industry) should be utilized.

Third, to replace lead (Pb) used in marine seaweed, fishery products, and aquaculture in the marine industry, it should be manufactured as an eco-friendly material with no abnormalities in the analysis of harmful substances.

In the prior art related to an apparatus and a method of a synthetic resin mixed material including such a non-gravitational body, in Patent Publication No. 2005-0004709, a product mold is installed in front of a nozzle formed at the tip of an injection plunger body, and a rear end is connected to a plunger piston rod A hydraulic (pneumatic) cylinder (or a submotor for injection) is provided in a front upper portion of the injection port, and a heater is attached to a peripheral wall provided in the vertical direction in the injection port. A transfer pipe connected to a plastic extrusion cylinder having a heater on its main surface and a transfer pipe connected to a iron powder hopper having a heater on its main surface are connected to an inlet formed at an upper portion of the mixed transfer cylinder The extrusion cylinder is installed in a horizontal direction, (Or pneumatic) cylinder (or a submotor for injection) is provided on the rod of the barrel, and a plastic raw material hopper having a supply amount control port is provided on the upper side of the rod. It is public.

In another prior art, in manufacturing a ceramic injection material having a high boiling point for use as a fishing spoon, a fish net, etc., in Japanese Patent Publication No. 0332997, The injection material is prepared by preparing 24% of PVC, 20% of powdery ceramic with aluminum oxide as a main component, 50% of barium, 4% of DOA (Dioctyl Adipate) and 2% of stabilizer, And the DOA is added to the DOA at an internal temperature of about 100 DEG C, and the ceramic, barium, and stabilizer are added at a temperature of about 100 to 120 DEG C in the blender, and the blended material is heated to an internal temperature of about 195 DEG C And the mixture is melted and mixed to be extruded, and the extrudate extruded from the extruder is made into a plate having a certain thickness, followed by cooling and crushing. The method for producing a ceramic injection material having a high specific gravity It is public.

However, the synthetic resin mixed material including the non-gravitational grains of the prior art is complicated in shape and difficult to manufacture, and the manufacturing process is complicated due to complicated shapes, which takes a long time to manufacture the finished product, which is disadvantageous in that the productivity is low.

Disclosure of the Invention The present invention has been made in order to solve the above problems, and it is an object of the present invention to shorten the production time by shortening the production time and to reduce the labor cost and production time required for the conventional mortar injection and extrusion method, So that it is possible to provide a synthetic resin mixed material injection apparatus including a specific gravity-weighted material with high cost competitiveness.

The synthetic resin mixed material injection apparatus including the specific gravity added to the synthetic resin of the present invention comprises a mixer for mixing synthetic resin and a specific gravity, and an injection machine for injection molding synthetic resin mixed in the mixer and specific gravity, A mixing tank in which an inner space is formed and a synthetic resin to be supplied and a specific gravity are mixed in an inner space, and a pair of metering tanks for supplying a predetermined amount of synthetic resin and a specific gravity to the mixing tank, An extrusion heating section for heating and melting the mixed synthetic resin and the non-mass body; and a molding section for molding the synthetic resin melted in the extrusion heating section and the non-mass body in a mold.

The present invention is a manufacturing method that utilizes eco-friendly materials and renewable energy resources. It reduces production time by reducing production time compared to conventional mortar injection extrusion injection method. It reduces labor costs and improves quality by reducing defect rate by simplifying process steps. .

In addition, there is a remarkable effect that the processed material can be pulverized and reused in the event of a failure, thereby ensuring cost competitiveness due to waste treatment cost and raw material reduction.

FIG. 1 is a front schematic view of a mixer installed in a synthetic resin mixed material injection apparatus including a non-mass body according to the present invention. FIG.
Fig. 2 is a side schematic view of an injection molding machine installed in a synthetic resin mixed material injection apparatus including a non-gravity material according to the present invention.
FIG. 3 is a front schematic view of an injection molding machine installed in a synthetic resin mixed material injection apparatus including a specific gravity material according to the present invention. FIG.
FIG. 4 is a schematic view showing an extrusion / heating unit of an injection molding machine installed in a synthetic resin mixed material injection apparatus including a specific gravity material of the present invention. FIG.
FIG. 5 is a perspective view of a preheating heat exchanger installed in a synthetic resin mixed material injection apparatus including a specific gravity material according to the present invention. FIG.
6 is a side view of a preheater installed in a synthetic resin mixed material injection apparatus including a specific gravity material of the present invention.
FIG. 7 is a cross-sectional schematic diagram of another embodiment of a preheating apparatus installed in a synthetic resin mixed material injection apparatus including a specific gravity material according to the present invention. FIG.
8 is a view showing a manufacturing process of a synthetic resin mixed material injection apparatus including a non-mass body according to the present invention.

A synthetic resin mixed material injection apparatus including a specific gravity added to a synthetic resin of the present invention includes a mixer (100) for mixing a synthetic resin and a specific gravity, an injector (100) for injecting synthetic resin and a specific gravity mixed in the mixer (100) comprises a mixing tank (110) for mixing the synthetic resin supplied with the internal space and the specific gravity in the internal space, and a mixing tank (110) for mixing a predetermined amount of synthetic resin and specific gravity The injection machine 300 includes an extrusion heating unit 310 for heating and melting the synthetic resin and the specific gravity mixed in a predetermined amount and the extrusion heating unit 310 for heating the non- And a molding part 320 for molding the molten synthetic resin and the specific gravity in a mold.

The extrusion heating unit 210 of the injection machine 200 includes a first hopper 211 into which a non-mass body and a synthetic resin are inputted, a synthetic resin and a specific gravity fed into the first hopper 211 by high frequency, The synthetic resin in the first hopper 311 and the non-gravitated body are placed between the first hopper 211 and the first high-frequency heat exchanger 212 so that the first high- The first conveyance pipe 214 is installed to be able to move to the first conveyance passage 212 and the conveyance screw installed in the first high frequency conveyance 212 is driven at one end of the first high frequency induction heat 212 And the first drive motor 213 is mounted to transfer the melted synthetic resin to the non-mass and liquid phase.

A preheater 300 for melting the synthetic resin in a semi-solid state is formed between the mixer 100 and the injector 200. The preheater 300 is connected to a synthetic resin And a second high frequency heater 330 for heating the non-gravity and synthetic resin introduced into the second hopper 310 by high frequency to melt the synthetic resin in a semi-solid state, A second conveyance pipe 330 is provided between the second hopper 310 and the second high frequency heater 330 so that synthetic resin and semi-solid in the second hopper 310 can move to the second high frequency heater 330, And a second driving motor 340 for driving a conveying screw installed inside the second high frequency heater 330 is installed at one end of the second high frequency heater 230 so that the specific gravity It transfers molten synthetic resin in semi-solid state with sieve The.

The metering tank 120 is installed on the upper part of the mixing tank 110 and includes a resin storage tank 121 for discharging the synthetic resin in a predetermined amount and a non-gravity storage tank 122 for discharging the non- A plurality of resin storage tanks 121 and a plurality of non-storage tanks 122 are vertically spaced apart from each other by a predetermined distance. The synthetic resins and the non-gravity bodies are separated by the resin storage tanks 121 and the non- And is introduced into the mixing tank 110 through a plurality of metering steps.

A method for manufacturing a synthetic resin mixed material including a specific gravity comprises the steps of: (1) injecting a synthetic resin and a specific gravity into a mixer (100); A second step of mixing a synthetic resin and a specific gravity in the mixer 100; A third step of discharging a synthetic resin and a specific gravity mixed in the mixer 100 in a predetermined amount; Melting the synthetic resin discharged from the mixer 100; A fifth step of molding the molten synthetic resin containing the specific gravity in the form of a finished product in an injection machine 300 equipped with a mold; And cooling the molded article in a sixth step.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a front schematic view of a mixer installed in a synthetic resin mixed material injection apparatus including a specific gravity of the present invention, FIG. 2 is a side schematic view of an injection machine installed in a synthetic resin mixed material injection apparatus including a non- FIG. 4 is a schematic view showing an extrusion / heating unit of an injection molding machine installed in a synthetic resin mixed material injection apparatus including a non-mass of the present invention, FIG. 5 is a schematic view of an injection molding machine FIG. 6 is a side view of a preheating furnace installed in a synthetic resin mixed material injection apparatus including a specific gravity material according to the present invention. FIG. 6 is a perspective view of a preheating furnace installed in a synthetic resin mixed material injection apparatus.

As shown in FIGS. 1 to 6, the injection apparatus of the present invention includes a mixer 100 for mixing a synthetic resin and a specific gravity, and an injector 300 for injection molding synthetic resin mixed with the mixer 100 and non- have.

The mixer 100 includes a mixing tank 110 for mixing the synthetic resin supplied with the internal space and the specific gravity in the internal space, a pair of synthetic resin and non-gravity supplying a predetermined amount of synthetic resin and specific gravity to the mixing tank 110, The injection machine 200 includes an extrusion heating unit 210 for heating and melting a synthetic resin and a specific gravity mixed in a predetermined amount and a synthetic resin melted in the extrusion heating unit 210 and a specific gravity And a molding part 220 for molding the body in a mold.

In the above description, the forming unit 220 is installed by an ordinary means, and a detailed description thereof will be omitted.

The metering tank 120 is installed at an upper portion of the mixing tank 110 and is composed of a resin storage tank 121 for discharging synthetic resin in a predetermined amount and a specific gravity storage tank 122 for discharging the specific gravity in a predetermined amount will be.

Particularly, since a plurality of the resin storage tanks 121 and the non-storage tanks 122 are vertically spaced apart from each other, the synthetic resin and the specific gravity, which are supplied to the mixing tank 110, And the non-gravity storage tank 122 are subjected to a plurality of quantification steps.

The extrusion heating unit 210 of the injection machine 200 includes a first hopper 211 into which a non-mass body and a synthetic resin are inputted, a synthetic resin and a specific gravity fed into the first hopper 211 by high frequency, And a first high-frequency heater 212 for dissolving the first high-frequency heater 212 therein.

A first conveyance pipe 214 is connected between the first hopper 211 and the first high frequency heater 212 so that the synthetic resin and the specific gravity in the first hopper 311 can be moved by the first high- And a first driving motor 213 for driving a conveying screw provided inside the first high frequency heater 212 is mounted at one end of the first high frequency heater 212 so that a non- Thereby transferring the molten synthetic resin.

A preheating heat exchanger 300 for melting the synthetic resin in a semi-solid state is installed between the mixer 100 and the injector 200.

The preheater 300 includes a second hopper 310 into which a synthetic resin and a specific gravity are mixed by a mixer 100 and a second hopper 310 which heats the grains and the synthetic resin charged in the second hopper 310 with high frequency And a second high frequency heater (330) for melting the synthetic resin in a semi-solid state.

In addition, a second feed (330) is provided between the second hopper (310) and the second high frequency heater (330) so that the semi-solid synthetic resin in the second hopper (310) And a second driving motor 340 for driving a conveying screw provided inside the second high frequency heater 330 is installed at one end of the second high frequency heater 330 The molten synthetic resin is transferred in a semi-solid state to the non-solid body.

Accordingly, by supplying the synthetic resin to the second hopper 320 installed in the extrusion / heating unit 210 of the injection device 200, the product can be injection molded very quickly in the injection device 200.

At this time, since the first high-frequency heater 212 and the second high-frequency heater 330 are heated so that the internal temperature is 300 to 400 ° C, the specific gravity metal material is not melted but only the synthetic resin is melted.

The first conveyance pipe 214 provided between the first hopper 211 of the extrusion heating unit 210 and the first high frequency heater 212 and the second conveyance pipe 214 provided between the preheater 300 and the second hopper 211 of the extruder 200, The second conveyance pipe 320 provided between the second high frequency furnace 320 and the second high frequency furnace 330 is slanted so that the first high frequency furnace 212 and the second high frequency furnace 330 can smoothly move .

7 is a cross-sectional schematic diagram of another embodiment of the preheating apparatus installed in the synthetic resin mixed material injection apparatus including the non-gravity material of the present invention.

7, the second high frequency heater 330 of the preliminary heater 300 includes an upper tube 331 and a lower tube 332 in which a pair of the upper flange 333 and the lower flange 334 come into contact with each other, The upper end of the upper pipe 331 is further protruded downward than the upper flange 333 and inserted into the inner diameter of the lower pipe 332.

That is, the outer diameter of the upper tube 331 and the inner diameter of the lower tube 332 are in contact with each other.

A protruding piece 335 protruding upward is formed at an edge of a lower flange 334 formed at an end of the lower tube 332. A rotating piece 336 is provided at an upper end of the protruding piece 335, And is hinged so as to be vertically rotatable.

A ring-shaped hooking protrusion 337 is formed on the inner circumferential surface of the lower tube 332 so as to contact the end of the upper tube 331.

The upper pipe 331 of the second high frequency heater 330 is connected to the lower pipe 332 of the second high frequency heater 330 and the upper pipe 331 of the second high frequency heater 330 is connected to the lower pipe 332, So that the upper flange 333 and the lower flange 334 come into contact with each other and then the turning piece 336 hinged to the projecting piece 335 of the lower flange 334 is rotated to rotate the upper flange 333 As shown in FIG.

The upper flange 333, the lower flange 334 and the turning piece 335 are provided with through holes that pass through the upper flange 333 and the lower flange 334, respectively. The through holes are located on the same vertical line.

At this time, a plurality of the rotating pieces 336 are divided into a fan shape, and each of the divided rotating pieces is hinged to the projecting pieces 335, so that it is possible to rotate up and down smoothly when rotated by the hinge axis.

The upper tube 331 is inserted into the lower tube 332 and can be stably rotated in a desired direction and the upper tube 331 is rotated in an appropriate direction to rotate the upper flange 333 and the lower flange 334, When the screws are inserted into the through holes and fastened with the nuts, the upper tube 331 is more stably fastened to the lower tube 332. [

The configuration described above is not limited to the second high frequency heater 330 of the preheating heater 300 but may be applied to the first high frequency heater 212 of the injector 200. The upper tube 331 and the lower tube 332) are formed not by a pair but by a plurality of openings, and when a pair is compared, the upper tube is located at the upper side and the lower tube is located at the lower side.

Further, if the upper end of the upper pipe 331 is formed on the upper surface of the latching protuberance 337 formed at the inner periphery of the lower pipe 332, the upper pipe 331 can be stably inserted into the lower pipe 332, respectively.

FIG. 8 is a view illustrating a process for producing a synthetic resin mixed material including a non-grafted material according to the present invention.

As shown in FIG. 8, a synthetic resin mixed material including a specific gravity added to synthetic resin is added to the mixer 100 in the first step.

At this time, the synthetic resin may be selected from any one of recycled polypropylene (PP) and recycled polyethylene (PE).

3 to 5 parts by weight of a colorant, 100 to 200 parts by weight of a filler, 2 to 10 parts by weight of a processing aid, 2 to 5 parts by weight of an antioxidant and 3 to 50 parts by weight of a compound are mixed with 680 to 890 parts by weight of a synthetic resin.

The weight of the non-gravity material is 10 to 75% of the weight of the composite material.

Particularly, the non-gravitational body is made of either iron oxide or alumina oxide.

Colorants, fillers, processing aids, antioxidants, and compounds used for PP or PE materials.

For reference, a colorant is a substance used for coloring a coloring material (plastic, rubber, paper, fiber, leather, etc.), and a filler is mainly used for the purpose of reducing the cost and viscosity of a synthetic resin, It is a chemically inert material added and does not contribute to adhesion.

When the colorant is added in an amount of less than 3 parts by weight based on 680 to 890 parts by weight of the synthetic resin, coloring is not good. If the coloring agent is added in an amount exceeding 50 parts by weight, the effect of coloring is not significant.

Pigments and dyes are used for coloring, and carbon black, titanium white, and chromium are used as pigments. Dyes include oil dyes such as oil yellow, oil blue and oil red.

In general, colorants in the form of a masterbatch are most commonly used.

The processing aid improves the processability of the synthetic resin and smoothly performs a process such as mixing molding. If less than 2 parts by weight is added, the processability is deteriorated. If more than 1 part by weight is added, the effect is less than the amount added.

As a processing aid, a mixture of silica and silicon is generally used.

When the filler is added in an amount of less than 100 parts by weight, the effect is insufficient. When the filler is added in an amount exceeding 200 parts by weight, the original properties of the filler are changed.

The filler is glass fiber, calcium carbonate, talc, mica, silica, wood powder, chalk, etc. Recently, magnesium hydroxide (Mg (OH) 2) has been used.

And the antioxidant is a substance that prevents the action of oxygen against various substances which cause oxidation reaction at high temperature.

When the antioxidant is added in an amount of less than 2 parts by weight, the oxidation reaction occurs well. If the antioxidant is added in an amount of more than 5 parts by weight, the effect of preventing oxidation is not significant.

As antioxidants, mainly phenolic compounds, sulfur compounds and phosphorus compounds are mainly used, and phenolic antioxidants such as FDA, which is mainly represented by BHT, are used.

In addition, the compound serves as a lubricant to help the synthetic resin and iron ore to be well mixed. When added in an amount of less than 3 parts by weight, the synthetic resin and iron ore are not mixed well, and when added in an amount exceeding 5 parts by weight, the compound becomes too dilute.

Generally, the compound is made of lime powder, and silica (SiO ₂ ) added is also used.

The synthetic resin and the non-gravure material put into the mixer 100 are mixed in the mixer 100 as a two-step process.

In the third step, the synthetic resin and the non-gravity mixed in the mixer 100 are discharged in a predetermined amount.

In addition, the synthetic resin discharged from the mixer 100 is melted in a four step process.

The melting of the synthetic resin and the specific gravity is performed at 300 to 400 캜 using a high frequency heater.

Since the specific gravity is a metal material, it does not melt.

The melted synthetic resin and the non-gravure in the four-step process are molded in the finished product form in the injection machine 200 equipped with the mold as a five-step process.

Finally, a six-step process of cooling the finished product is performed.

The present invention is a manufacturing method that utilizes eco-friendly materials and renewable energy resources. It reduces production time by reducing production time compared to conventional mortar injection extrusion injection method. It reduces labor costs and improves quality by reducing defect rate by simplifying process steps. .

In addition, there is a remarkable effect that the processed material can be pulverized and reused in the event of a failure, thereby ensuring cost competitiveness due to waste treatment cost and raw material reduction.

100. Mixer
110. Mixing tank 120. Quantitative tank 121. Resin storage tank
122. Specific gravity storage tank
200. Injection machine
210. Extrusion heating section 211. First hopper 212. First high-
213. First drive motor 214. First transfer tube 215. Injection cylinder
220. Molded part
300. Spare heat
310. The second hopper
320. Second conveying pipe
330. Second high-frequency heater 331. Upper tube 332. Lower tube
333. Upper flange 334. Lower flange 335. Projection piece
336. Rotation 337. Jaws
340. Second drive motor

Claims (3)

A mixer 100 for mixing a synthetic resin and a specific gravity, and an injector 200 for injection molding synthetic resin mixed with the mixer 100 and specific gravity,
The mixer 100 includes a mixing tank 110 in which an inner space is formed and a synthetic resin to be supplied is mixed with a specific gravity in an inner space, a pair of synthetic resin and a non- And a metering tank 120,
The injection machine 200 includes an extrusion heating unit 210 for heating and melting a synthetic resin and a specific gravity mixed in a predetermined amount and a molding unit 220 for molding the synthetic resin and non- ), Which is added to a synthetic resin to add weight to the synthetic resin mixed material injection apparatus,
The metering tank 120 is installed on the upper part of the mixing tank 110 and is composed of a resin storage tank 121 for discharging synthetic resin in a predetermined amount and a specific gravity storage tank 122 for discharging the specific gravity in a predetermined amount,
Since the plurality of resin storage tanks 121 and the non-storage tanks 122 are spaced apart from each other by a predetermined distance in the vertical direction, the synthetic resin and the specific gravity, which are supplied to the mixing tank 110, Is subjected to a plurality of quantification steps by the non-gravity storage tank 122,
The extrusion heating unit 210 of the injection machine 200 includes a first hopper 211 into which a non-mass body and a synthetic resin are inputted, a synthetic resin and a specific gravity fed into the first hopper 211 by high frequency, And a first high-frequency heater 212 for dissolving the high-
A first conveyance pipe 214 is provided between the first hopper 211 and the first high frequency heater 212 so that synthetic resin and a specific gravity in the first hopper 311 can be moved by the first high frequency heater 212 And a first driving motor 213 for driving a conveying screw provided inside the first high frequency heater 212 is mounted at one end of the first high frequency heater 212 so as to be placed in a non- Transferring the molten synthetic resin,
A preheater 300 for melting the synthetic resin in a semi-solid state is formed between the mixer 100 and the injector 200. The preheater 300 is made of synthetic resin mixed in a predetermined amount in the mixer 100, And a second high frequency heater 330 for heating the non-gravity and synthetic resin charged in the second hopper 310 with a high frequency to melt the synthetic resin in a semi-solid state,
A first conveyance pipe (not shown) is disposed between the second hopper 310 and the second high frequency heater 330 so that synthetic resin and semi-solid in the second hopper 310 can move to the second high frequency heater 330 And a second driving motor 340 for driving a conveying screw provided inside the second high frequency heater 330 is installed at one end of the second high frequency heater 330, And the molten synthetic resin is transferred in a semi-solid state,
A first conveyance pipe 214 provided between the first hopper 211 of the extrusion heating unit 210 and the first high frequency heater 212 in the injector 200 and a second conveyance pipe 214 provided in the preheater 300, 320 and the second high frequency heater 330 are slanted so that the first high frequency heater 212 and the second high frequency heater 330 can smoothly move,
The second high frequency heater 330 of the preheater 300 comprises an upper tube 331 and a lower tube 332 which are coupled by a pair of upper flanges 333 and lower flanges 334 in contact with each other The upper end of the upper pipe 331 is further protruded downward than the upper flange 333 and inserted into the inner diameter of the lower pipe 332,
A ring-shaped hooking protrusion 337 is formed on an inner circumferential surface of the lower tube 332 so as to contact an end of the upper tube 331,
A protruding piece 335 protruding upward is formed at an edge of a lower flange 334 formed at an end of the lower tube 332. A pivotal piece 336 is provided at an upper end of the protruding piece 335 Hinged to be rotatable,
A plurality of the rotating pieces 336 are divided into a fan shape and are hinged to the respective protruding pieces 335 for each of the divided rotating pieces 336 so that the upper and lower rotations can be smoothly performed by the hinge axis when rotated.
The upper pipe 331 of the second high frequency heater 330 is inserted into the lower pipe 332 so that the upper flange 333 and the lower flange 334 come into contact with each other, The upper flange 333 and the lower flange 334 and the through hole 336 formed in the rotating piece 336 are rotated so as to be brought into contact with the upper surface of the upper flange 333 by rotating the rotating piece 336 hinged to the projecting piece 335 And a screw is inserted into the through hole so that the hole is positioned on the same vertical line, and is fastened with a nut.
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