阅读说明：本技术 一种用于新材料生产的反应装置 (A reaction unit for new material production ) 是由 平步青 于 2019-09-20 设计创作，主要内容包括：本发明涉及一种用于新材料生产的反应装置,包括主体,还包括搅拌机构和清洁机构,所述搅拌机构设置在主体的内部,所述清洁机构设置在主体上,所述清洁机构与搅拌机构连接,所述搅拌机构包括驱动组件、安装轴承、动力管、第二输水管、搅拌管、两个传动杆、两个转动条板、至少两个第一浆叶和至少两个第二浆叶,所述清洁机构包括水箱、水泵、第一输水管、旋转接头、单向阀和至少两个喷嘴,所述动力组件包括电机、第一齿轮、第二齿轮和第三齿轮,该用于新材料生产的反应装置中,通过搅拌机构可以对原料进行搅拌,提升了原料混合的均匀度,提高了反应釜生产成品的质量,通过清洁机构可以自动对反应釜进行清洁,提高了反应釜清洁的便捷度。(The invention relates to a reaction device for producing new materials, which comprises a main body, a stirring mechanism and a cleaning mechanism, wherein the stirring mechanism is arranged inside the main body, the cleaning mechanism is arranged on the main body and is connected with the stirring mechanism, the stirring mechanism comprises a driving assembly, an installation bearing, a power pipe, a second water pipe, a stirring pipe, two transmission rods, two rotating slats, at least two first blades and at least two second blades, the cleaning mechanism comprises a water tank, a water pump, a first water pipe, a rotary joint, a one-way valve and at least two nozzles, the power assembly comprises a motor, a first gear, a second gear and a third gear, in the reaction device for producing new materials, the raw materials can be stirred by the stirring mechanism, the uniformity of raw material mixing is improved, and the quality of finished products produced by a reaction kettle is improved, can clean reation kettle automatically through clean mechanism, improve reation kettle's clear convenient degree.)

1. A reaction device for new material production comprises a main body (3), and is characterized by further comprising a stirring mechanism and a cleaning mechanism, wherein the stirring mechanism is arranged inside the main body (3), the cleaning mechanism is arranged on the main body (3), and the cleaning mechanism is connected with the stirring mechanism;

the stirring mechanism comprises a driving assembly, a mounting bearing (16), a power pipe (11), a second water conveying pipe (12), a stirring pipe (10), two transmission rods (7), two rotating slats (8), at least two first blades (14) and at least two second blades (15), wherein the mounting bearing (16) is mounted at the center of the top end of the main body (3), the power pipe (11) and the second water conveying pipe (12) are coaxially arranged with the main body (3), the power pipe (11) is arranged inside the main body (3), the top end of the main body (3) is connected with the main body (3) through the mounting bearing (16), the second water conveying pipe (12) penetrates through the power pipe (11), the second water conveying pipe (12) is in sliding connection with the power pipe (11), the length of the second water conveying pipe (12) is greater than that of the power pipe (11), the driving assembly is arranged at the top of the main body (3), the driving assembly is connected with both the second water conveying pipe (12) and the power pipe (11), the stirring pipe (10) is U-shaped with an upward opening, the middle part of the stirring pipe (10) is fixedly connected with the bottom end of the second water conveying pipe (12), the stirring pipe (10) is communicated with the second water conveying pipe (12), the rotating slats (8) are parallel to the axis of the power pipe (11), the two rotating slats (8) are symmetrically arranged relative to the axis of the power pipe (11), the two rotating slats (8) are arranged on the inner side of the stirring pipe (10), the top ends of the two rotating slats (8) are fixedly connected with the power pipe (11) through the transmission rod (7), the distance between one side of the rotating slats (8) and the power pipe (11) is larger than the distance between the other side of the rotating slats (8) and the power pipe (11), and the second blades (15) are uniformly arranged on the periphery of the power pipe (11) in the circumferential direction around the axis of the power pipe (11), the first blades (14) are uniformly arranged on the periphery of the bottom end of the second water conveying pipe (12) in the circumferential direction around the axis of the second water conveying pipe (12);

the cleaning mechanism comprises a water tank (1), a water pump (6), a first water delivery pipe (2), a rotary joint (4), a one-way valve (13) and at least two nozzles (9), wherein the nozzles (9) are arranged on the outer side of the stirring pipe (10) along the stirring pipe (10), the nozzles (9) are communicated with the stirring pipe (10), the one-way valve (13) is installed on the bottom end of the second water delivery pipe (12), the rotary joint (4) is installed on the top end of the second water delivery pipe (12), the water tank (1) is arranged on one side of the main body (3), the water pump (6) is arranged at the bottom of the water tank (1), and the water pump (6) is connected with the rotary joint (4) through the first water delivery pipe (2).

2. The reaction device for the production of new materials according to claim 1, characterized in that the main body (3) is provided with a control box, the control box is provided with a PLC inside, the control box is provided with a display screen and at least two control keys, and the display screen and each control key are electrically connected with the PLC.

3. The reaction device for the production of new materials according to claim 1, wherein the power assembly comprises a motor (5), a first gear (18), a second gear (19) and a third gear (20), the first gear (18) is installed at the top end of the second water pipe (12), the third gear (20) is installed at the top end of the power pipe (11), the motor (5) is fixedly connected with the main body (3), the motor (5) is in transmission connection with the second gear (19), the second gear (19) is arranged between the first gear (18) and the third gear (20), and the second gear (19) is connected with both the first gear (18) and the third gear (20).

4. The reaction device for producing the new material according to claim 1, wherein a support plate (17) is arranged on the second water pipe (12), the support plate (17) is arranged on one side of the power pipe (11) far away from the stirring pipe (10), the support plate (17) is perpendicular to the second water pipe (12), at least two balls (21) are arranged on one side of the support plate (17) close to the power pipe (11), and the support plate (17) is in rolling connection with the periphery of the top end of the power pipe (11) through the balls (21).

5. The reaction device for the production of new materials according to claim 1, wherein a sealing ring is arranged at the bottom end of the power pipe (11), and the power pipe (11) is connected with the second water pipe (12) in a sealing way through the sealing ring.

6. The reaction device for the production of new materials according to claim 1, characterized in that the first water duct (2), the second water duct (12) and the stirring pipe (10) are made of stainless steel.

7. Reaction device for the production of new materials according to claim 1, characterised in that the inner wall of the power tube (11) is coated with grease.

8. Reaction device for the production of new materials according to claim 1, characterised in that the inner walls of the tank (1) are coated with an anti-corrosive coating.

9. A reactor device for the production of new materials according to claim 3, characterised in that the motor (5) is a servomotor.

10. The reactor for the production of new materials according to claim 2, wherein said display screen is a liquid crystal display screen.

Technical Field

The invention relates to the field of new material production equipment, in particular to a reaction device for producing new materials.

Background

The broad understanding of the reaction kettle is that there is a container for physical or chemical reaction, which is widely used in the production of new materials, and it realizes the heating, evaporating, cooling and low-speed mixing functions required by the process by the structural design and parameter configuration of the container. The reaction kettle is widely applied to pressure vessels for petroleum, chemical engineering, rubber, pesticides, dyes, medicines and foods, and is used for completing technological processes such as vulcanization, nitration, hydrogenation, alkylation, polymerization, condensation and the like, such as a reactor, a reaction kettle, a decomposition kettle, a polymerization kettle and the like; the material is generally carbon manganese steel, stainless steel, zirconium, nickel-based (Hastelloy, Monel, Inconel) alloy and other composite materials.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: in order to overcome the defects of the prior art, a reaction device for producing new materials is provided.

The technical scheme adopted by the invention for solving the technical problems is as follows: a reaction device for producing new materials comprises a main body, a stirring mechanism and a cleaning mechanism, wherein the stirring mechanism is arranged in the main body, the cleaning mechanism is arranged on the main body, and the cleaning mechanism is connected with the stirring mechanism;

the stirring mechanism comprises a driving assembly, an installation bearing, a power pipe, a second water pipe, a stirring pipe, two transmission rods, two rotating slats, at least two first blades and at least two second blades, wherein the installation bearing is installed at the center of the top end of the main body, the power pipe and the second water pipe are coaxially arranged with the main body, the power pipe is arranged inside the main body, the top end of the main body is connected with the main body through the installation bearing, the second water pipe penetrates through the power pipe, the second water pipe is in sliding connection with the power pipe, the length of the second water pipe is larger than that of the power pipe, the driving assembly is arranged at the top of the main body, the driving assembly is connected with the second water pipe and the power pipe, the stirring pipe is in a U shape with an upward opening, and the middle of the stirring pipe is fixedly connected with the bottom end of the second water pipe, the stirring pipe is communicated with a second water conveying pipe, the rotating slats are parallel to the axis of the power pipe, the two rotating slats are symmetrically arranged relative to the axis of the power pipe, the two rotating slats are arranged on the inner side of the stirring pipe, the top ends of the two rotating slats are fixedly connected with the power pipe through transmission rods, the distance between one side of each rotating slat and the power pipe is larger than the distance between the other side of each rotating slat and the power pipe, the second blades are uniformly arranged on the periphery of the power pipe in the circumferential direction around the axis of the power pipe, and the first blades are uniformly arranged on the periphery of the bottom end of the second water conveying pipe in the circumferential direction around the axis of the second water conveying pipe;

the cleaning mechanism comprises a water tank, a water pump, a first water delivery pipe, a rotary joint, a one-way valve and at least two nozzles, wherein the nozzles are arranged on the outer side of the stirring pipe along the stirring pipe, the nozzles are communicated with the stirring pipe, the one-way valve is installed at the bottom end of the second water delivery pipe, the rotary joint is installed at the top end of the second water delivery pipe, the water tank is arranged on one side of the main body, the water pump is arranged at the bottom of the water tank, and the water pump is connected with the rotary joint through the first water delivery pipe.

Preferably, in order to improve the automation degree of the reaction kettle, a control box is arranged on the main body, a PLC is arranged in the control box, a display screen and at least two control keys are arranged on the control box, and the display screen and the control keys are electrically connected with the PLC.

Preferably, in order to provide power for the power pipe and the second water conveying pipe, the power assembly comprises a motor, a first gear, a second gear and a third gear, the first gear is mounted at the top end of the second water conveying pipe, the third gear is mounted at the top end of the power pipe, the motor is fixedly connected with the main body, the motor is in transmission connection with the second gear, the second gear is arranged between the first gear and the third gear, and the second gear is connected with both the first gear and the third gear.

Preferably, in order to improve the firmness of the connection between the second water delivery pipe and the power pipe, a support plate is arranged on the second water delivery pipe, the support plate is arranged on one side, away from the stirring pipe, of the power pipe, the support plate is perpendicular to the second water delivery pipe, at least two balls are arranged on one side, close to the power pipe, of the support plate, and the support plate is in rolling connection with the periphery of the top end of the power pipe through the balls.

Preferably, in order to improve the sealing performance between the second water delivery pipe and the power pipe, a sealing ring is arranged at the bottom end of the power pipe, and the power pipe is connected with the second water delivery pipe in a sealing mode through the sealing ring.

Preferably, in order to prolong the service life of the first water pipe, the second water pipe and the stirring pipe, the first water pipe, the second water pipe and the stirring pipe are made of stainless steel.

Preferably, in order to improve the smoothness of the rotation of the second water pipe, the inner wall of the power pipe is coated with grease.

Preferably, in order to prolong the service life of the water tank, the inner wall of the water tank is coated with an anticorrosive coating.

Preferably, in order to improve the accuracy of controlling the rotating speed of the power pipe and the second water conveying pipe, the motor is a servo motor.

Preferably, the display screen is a liquid crystal display screen in order to improve the definition of the display screen.

The reaction device for producing the new material has the advantages that the raw materials can be stirred through the stirring mechanism, the uniformity of raw material mixing is improved, the quality of finished products produced by the reaction kettle is improved, compared with the existing stirring mechanism, the stirring mechanism realizes cross flow in the horizontal direction and the vertical direction, the stirring effect of the reaction kettle is improved, the reaction kettle can be automatically cleaned through the cleaning mechanism, the convenience of cleaning the reaction kettle is improved, the practicability of the reaction kettle is improved, compared with the existing cleaning mechanism, liquid raw materials can be uniformly added into the reaction kettle through the cleaning mechanism, and the practicability of the reaction kettle is further improved.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a schematic structural view of a reaction apparatus for new material production of the present invention;

FIG. 2 is a cross-sectional view of a reactor apparatus for the production of new material in accordance with the present invention;

FIG. 3 is a schematic structural view of a stirring mechanism of the reaction apparatus for new material production of the present invention;

FIG. 4 is an enlarged view of portion A of FIG. 2;

in the figure: 1. the water pump comprises a water tank, 2, a first water delivery pipe, 3, a main body, 4, a rotary joint, 5, a motor, 6, a water pump, 7, a transmission rod, 8, a rotating strip plate, 9, a nozzle, 10, a stirring pipe, 11, a power pipe, 12, a second water delivery pipe, 13, a one-way valve, 14, a first blade, 15, a second blade, 16, a mounting bearing, 17, a support plate, 18, a first gear, 19, a second gear, 20, a third gear and 21 balls.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.

As shown in fig. 1-2, a reaction apparatus for new material production comprises a main body 3, and further comprises a stirring mechanism and a cleaning mechanism, wherein the stirring mechanism is arranged inside the main body 3, the cleaning mechanism is arranged on the main body 3, and the cleaning mechanism is connected with the stirring mechanism;

the raw materials can be stirred by the stirring mechanism, the uniformity of raw material mixing is improved, the quality of finished products produced by the reaction kettle is improved, the reaction kettle can be automatically cleaned by the cleaning mechanism, the convenience of cleaning the reaction kettle is improved, and the practicability of the reaction kettle is improved;

as shown in fig. 2-3, the stirring mechanism includes a driving assembly, a mounting bearing 16, a power pipe 11, a second water pipe 12, a stirring pipe 10, two transmission rods 7, two rotating slats 8, at least two first blades 14 and at least two second blades 15, the mounting bearing 16 is mounted at the center of the top end of the main body 3, the power pipe 11 and the second water pipe 12 are both coaxially disposed with the main body 3, the power pipe 11 is disposed inside the main body 3, the top end of the main body 3 is connected to the main body 3 through the mounting bearing 16, the second water pipe 12 passes through the power pipe 11, the second water pipe 12 is slidably connected to the power pipe 11, the length of the second water pipe 12 is greater than that of the power pipe 11, the driving assembly is disposed at the top of the main body 3, the driving assembly is connected to both the second water pipe 12 and the power pipe 11, the stirring pipe 10 is in a U shape with an upward opening, the middle of the stirring pipe 10 is fixedly connected with the bottom end of a second water conveying pipe 12, the stirring pipe 10 is communicated with the second water conveying pipe 12, the rotating slats 8 are parallel to the axis of the power pipe 11, the two rotating slats 8 are symmetrically arranged relative to the axis of the power pipe 11, the two rotating slats 8 are arranged on the inner side of the stirring pipe 10, the top ends of the two rotating slats 8 are fixedly connected with the power pipe 11 through a transmission rod 7, the distance between one side of each rotating slat 8 and the power pipe 11 is larger than the distance between the other side of each rotating slat 8 and the power pipe 11, each second paddle 15 is circumferentially and uniformly arranged on the periphery of the power pipe 11 around the axis of the power pipe 11, and each first paddle 14 is circumferentially and uniformly arranged on the periphery of the bottom end of the second water conveying pipe 12 around the axis of the second water conveying pipe 12;

the stability of the power pipe 11 is improved by installing the bearing 16, the stability of the second water pipe 12 is improved by the power pipe 11, the power is provided by the driving component, the power pipe 11 is driven to rotate in the forward direction, the rotating slat 8 is driven to rotate in the forward direction by the power pipe 11 under the transmission action of the transmission rod 7, meanwhile, the second water pipe 12 is driven to rotate in the reverse direction by the driving component, the stirring pipe 10 is driven to rotate in the reverse direction by the second water pipe 12, the raw materials are driven to flow in the horizontal direction by the reverse rotation between the stirring pipe 10 and the rotating slat 8, then the raw materials are stirred by the stirring pipe 10, the cross flow of the raw materials in the horizontal direction is realized, the uniformity of raw material mixing is improved, meanwhile, the second paddle 15 and the first paddle 14 are respectively driven to rotate by the power pipe 11 and the second water pipe 12, the raw materials are driven to flow in the vertical reverse direction by the first paddle 14 and the second paddle 15, the cross flow of the raw materials in the vertical direction is realized, the uniformity of raw material mixing is further improved, and the quality of the reaction kettle produced to be flat is improved;

as shown in fig. 2, the cleaning mechanism includes a water tank 1, a water pump 6, a first water pipe 2, a rotary joint 4, a check valve 13 and at least two nozzles 9, wherein the nozzles 9 are arranged along the stirring pipe 10 and are arranged outside the stirring pipe 10, the nozzles 9 are communicated with the stirring pipe 10, the check valve 13 is installed at the bottom end of a second water pipe 12, the rotary joint 4 is installed at the top end of the second water pipe 12, the water tank 1 is arranged at one side of the main body 3, the water pump 6 is arranged at the bottom of the water tank 1, and the water pump 6 is connected with the rotary joint 4 through the first water pipe 2;

under the action of the one-way valve 13, the probability of the raw material flowing back to the inside of the water tank 1 is reduced, in the process of rotating the power pipe 11 and the second water conveying pipe 12, the residual raw material on each device inside the reaction kettle is thrown to the inner wall of the reaction kettle under the action of inertia, actually, clear water is stored inside the water tank 1, power is provided by the water pump 6, the clear water is conveyed to the inside of the stirring pipe 10 through the first water conveying pipe 2, the rotary joint 4 and the second water conveying pipe 12, each nozzle 9 is driven to rotate through the stirring pipe 10, the water spraying range of the nozzle 9 is enlarged, the clear water is sprayed to the inner wall of the reaction kettle through the nozzle 9, the raw material on the inner wall of the reaction kettle can be washed clean, then the sewage is discharged from the discharge port of the reaction kettle, the automatic cleaning of the reaction kettle is realized, in the working process of the reaction kettle, if an operator puts the liquid raw material into the inside of the water tank, then can be with the even inside of sending to reation kettle of liquid raw materials through nozzle 9, realized the even reinforced function to reation kettle inside, further improved reation kettle production finished product's quality.

Preferably, in order to improve the automation degree of the reaction kettle, the main body 3 is provided with a control box, a PLC is arranged in the control box, the control box is provided with a display screen and at least two control keys, and the display screen and the control keys are electrically connected with the PLC; the PLC is a programmable logic controller, it adopts a kind of programmable memory, it is used for its internal storage program, implement logic operation, sequence control, timing, counting and arithmetic operation, etc. and control various kinds of machinery or production process by digital or analog input/output, it is a computer specially used for industrial control, its hardware structure is basically the same as microcomputer, generally used for the processing of data and receiving and outputting of the order, it is used for realizing central control, the operator sends the control signal to PLC through the control key, then control the operation of the reaction kettle through PLC, at the same time can display the working condition of the reaction kettle through the display screen, then the automaticity of the reaction kettle is improved.

As shown in fig. 4, the power assembly includes a motor 5, a first gear 18, a second gear 19 and a third gear 20, the first gear 18 is installed at the top end of the second water pipe 12, the third gear 20 is installed at the top end of the power pipe 11, the motor 5 is fixedly connected with the main body 3, the motor 5 is in transmission connection with the second gear 19, the second gear 19 is arranged between the first gear 18 and the third gear 20, and the second gear 19 is connected with both the first gear 18 and the third gear 20;

the second gear 19 is driven by the motor 5 to rotate, and the second water pipe 12 and the power pipe 11 are driven to rotate reversely by the second gear 19 under the transmission action of the first gear 18 and the third gear 20.

Preferably, in order to improve the firmness of the connection between the second water delivery pipe 12 and the power pipe 11, a support plate 17 is arranged on the second water delivery pipe 12, the support plate 17 is arranged on one side, far away from the stirring pipe 10, of the power pipe 11, the support plate 17 is perpendicular to the second water delivery pipe 12, at least two balls 21 are arranged on one side, close to the power pipe 11, of the support plate 17, and the support plate 17 is in rolling connection with the periphery of the top end of the power pipe 11 through the balls 21; through the supporting function of the supporting plate 17, the probability that the second water conveying pipe 12 descends along the power pipe 11 is reduced, the connection stability of the second water conveying pipe 12 and the power pipe 11 is improved, the friction force between the supporting plate 17 and the power pipe 11 is reduced through the balls 21, and the rotating smoothness of the second water conveying pipe 12 is improved.

Preferably, in order to improve the sealing performance between the second water pipe 12 and the power pipe 11, a sealing ring is arranged at the bottom end of the power pipe 11, and the power pipe 11 is connected with the second water pipe 12 in a sealing manner through the sealing ring;

the gap between the second water pipe 12 and the power pipe 11 is reduced through the sealing ring, the sealing performance between the second water pipe 12 and the power pipe 11 is improved, and the leakage probability of the raw materials inside the reaction kettle from the second water pipe 12 is reduced.

Preferably, in order to prolong the service life of the first water delivery pipe 2, the second water delivery pipe 12 and the stirring pipe 10, the first water delivery pipe 2, the second water delivery pipe 12 and the stirring pipe 10 are made of stainless steel; due to the fact that the stainless steel has good corrosion resistance, the corrosion speed of the first water delivery pipe 2, the second water delivery pipe 12 and the stirring pipe 10 is reduced, and the service lives of the first water delivery pipe 2, the second water delivery pipe 12 and the stirring pipe 10 are prolonged.

Preferably, in order to improve the smoothness of the rotation of the second water pipe 12, the inner wall of the power pipe 11 is coated with grease; the friction between the second water pipe 12 and the power pipe 11 is reduced by the grease, and the smoothness of the rotation of the second water pipe 12 is improved.

Preferably, in order to prolong the service life of the water tank 1, an anti-corrosion coating is coated on the inner wall of the water tank 1;

the corrosion speed of the water tank 1 is slowed down through the anti-corrosion coating, and the service life of the water tank 1 is prolonged.

Preferably, the motor 5 is a servo motor in order to improve the accuracy of controlling the rotation speed of the power pipe 11 and the second water conveying pipe 12.

Preferably, the display screen is a liquid crystal display screen in order to improve the definition of the display screen.

The driving assembly is used for providing power to drive the power pipe 11 to rotate in the forward direction, the power pipe 11 is used for driving the rotating strip plate 8 to rotate in the forward direction under the transmission action of the transmission rod 7, the driving assembly is used for driving the second water pipe 12 to rotate in the reverse direction, the second water pipe 12 is used for driving the stirring pipe 10 to rotate in the reverse direction, the stirring pipe 10 and the rotating strip plate 8 are used for driving the raw materials to flow in the horizontal direction through the rotating strip plate 8 through the reverse rotation, then the raw materials are stirred through the stirring pipe 10, the cross flow of the raw materials in the horizontal direction is realized, the uniformity of raw material mixing is improved, the power pipe 11 and the second water pipe 12 are used for respectively driving the second paddle 15 and the first paddle 14 to rotate, the raw materials are driven to flow in the vertical direction through the first paddle 14 and the second paddle 15, the cross flow of the raw materials in the vertical direction is realized, and the uniformity of raw material mixing is further, promoted reation kettle and produced into flat quality, at power pipe 11 and second raceway 12 pivoted in-process, remaining raw materials get rid of reation kettle's inner wall back of the body under inertial effect on the inside each device of reation kettle, in fact, 1 inside clear water of depositing of water tank, provide power through water pump 6, through first raceway 2, rotary joint 4 and second raceway 12 carry the clear water to inside the agitator pipe 10, rotate through each nozzle 9 of agitator pipe 10 drive, the water spray scope of nozzle 9 has been enlarged, then spray the clear water on reation kettle's inner wall through nozzle 9, then can wash the raw materials on the reation kettle inner wall totally, later discharge sewage from reation kettle discharge opening department, the self-cleaning to reation kettle has been realized.

Compared with the prior art, this a reaction unit for new material production, can stir the raw materials through rabbling mechanism, the degree of consistency that the raw materials mixes has been promoted, reation kettle produces off-the-shelf quality, compare with current rabbling mechanism, this rabbling mechanism has realized the ascending cross-flow of level and vertical side, reation kettle's stirring effect has been promoted, moreover, can clean reation kettle automatically through clean mechanism, reation kettle's clear convenient degree has been improved, reation kettle's practicality has been improved, compare with current clean mechanism, still can be with the even inside of adding reation kettle of liquid raw materials through this clean mechanism, reation kettle's practicality has further been improved.

In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.