阅读说明：本技术 一种用于检测食品中多种微生物的方法及装置 (Method and device for detecting multiple microorganisms in food ) 是由 阮雁春 于 2019-11-22 设计创作，主要内容包括：本发明涉及微生物检测技术领域,公开了一种用于检测食品中多种微生物的方法,该方法包括以下步骤:向混合皿中加入稀释液,将待测食品样品稀释,样品和稀释液的比例为1：10；将培养皿消毒灭菌,之后向不同的培养皿中分别加入培养不同种类目标微生物的培养基；向加入了微生物培养基的培养皿中分别加入显色化合物；将稀释后的样品稀释液通过分液容器进行无菌分液,使样品稀释液等量分入不同的培养皿中；对培养皿加温,使培养皿处于35-37℃进行培养,培养时间24-36h；培养结束,观察培养皿中的显色反应,以确定培养皿中是否存在目标微生物；取出培养皿,放置到显微镜下观察,计算目标微生物的含量。本发明方法操作简单,有利于基层工作人员进行操作。(The invention relates to the technical field of microbial detection, and discloses a method for detecting various microorganisms in food, which comprises the following steps of adding diluent into a mixing dish, diluting a food sample to be detected, wherein the ratio of the sample to the diluent is 1: 10; sterilizing the culture dishes, and then respectively adding culture mediums for culturing different types of target microorganisms into different culture dishes; adding chromogenic compounds into the culture dishes added with the microbial culture medium respectively; carrying out sterile liquid separation on the diluted sample diluent through a liquid separation container, and equivalently separating the sample diluent into different culture dishes; heating the culture dish to enable the culture dish to be at 35-37 ℃ for culture for 24-36 h; observing a color reaction in the culture dish after the culture is finished to determine whether the target microorganism exists in the culture dish; and taking out the culture dish, placing the culture dish under a microscope for observation, and calculating the content of the target microorganism. The method is simple to operate and is beneficial to basic-level workers to operate.)

1. A method for detecting a plurality of microorganisms in a food product, comprising: the method comprises the following steps:

sterilizing the mixing vessel, and sampling the food to be detected and putting the food into the mixing vessel;

adding a diluent into a mixing dish, diluting a food sample to be detected, wherein the ratio of the sample to the diluent is 1: 10, obtaining a sample diluent;

sterilizing the culture dishes, and then respectively adding culture mediums for culturing different types of target microorganisms into different culture dishes;

adding chromogenic compounds into the culture dishes added with the microbial culture medium respectively;

carrying out sterile liquid separation on the diluted sample diluent through a liquid separation container, and equivalently separating the sample diluent into different culture dishes;

heating the culture dish to enable the culture dish to be at 35-37 ℃ for culture for 24-36 h;

observing the chromogenic reaction in each culture dish after the culture is finished so as to determine whether the target microorganism exists in the culture dish;

and taking out the culture dish, placing the culture dish under a microscope for observation, and calculating the content of the target microorganism.

2. The method for detecting a plurality of microorganisms in a food product according to claim 1, wherein: the diluent adopts balanced salt solution.

3. The method for detecting a plurality of microorganisms in a food product according to claim 1, wherein: the medium provides nutrients to the target microorganism while inhibiting the growth of other microorganisms.

4. The method for detecting a plurality of microorganisms in a food product according to claim 1, wherein: the color development compound is prepared by mixing bromothymol blue and xylenol blue.

5. An apparatus for detecting a plurality of microorganisms in a food product, comprising: the device comprises a shell, wherein a cover plate is movably connected above the shell, a waste water tank outlet is arranged below the front surface of the shell, and a waste water tank is arranged in the waste water tank outlet; a culture dish outlet is arranged above the outlet of the wastewater tank, a support plate is arranged inside the culture dish outlet, a culture dish support is placed on the support plate, and a culture dish is placed in the culture dish support; sliding chutes are formed in the left side wall and the right side wall of the shell, sliding plates are mounted inside the sliding chutes on the left side and the right side, the left side and the right side of each sliding plate are connected with the edges of the sliding chutes in a sealing mode through rubber telescopic sleeves, and a layered partition plate is fixedly mounted between the two sliding plates; a mixing vessel is fixedly mounted on the upper side inside the shell, the lower part of the mixing vessel is communicated with liquid separating containers through a guide pipe, adjacent liquid separating containers are communicated through a communicating pipe, a liquid outlet pipe of each liquid separating container penetrates through the layered partition plate and then is positioned above the culture vessel, and a clamping device is arranged in each layered partition plate and used for controlling the opening and closing of the liquid outlet pipe; inside rear side fixed mounting of casing has the ultraviolet disinfection lamp, the ventilating fan is installed to the casing lateral wall, the inboard fixed mounting of ventilating fan has the heater strip, the ventilating fan outside is provided with air filter, fixed mounting has singlechip and temperature sensor on the lateral wall of culture dish support upside.

6. The apparatus for detecting a plurality of microorganisms in a food product according to claim 5, wherein: the inner part of the layering partition plate is of a cavity structure, a core plate is arranged in the layering partition plate, the length of the core plate is longer than that of the layering partition plate, the left end and the right end of the core plate penetrate through the two sliding plates and then are fixedly connected with pressing blocks, through holes are formed in the core plate and the layering partition plate, and the liquid outlet pipe is placed in the through holes.

7. The apparatus for detecting a plurality of microorganisms in a food product according to claim 6, wherein: the core plate right-hand member is provided with spacing groove one, the core plate left end is provided with spacing groove two, and the sliding plate on right side is inside to be provided with spacing card one, and left sliding plate is inside to be provided with spacing card two.

8. The apparatus for detecting a plurality of microorganisms in a food product according to claim 7, wherein: the first limiting clamp and the second limiting clamp are both composed of a clamp shell, a spring and a metal ball, the spring is located at the bottom of the clamp shell, the metal ball is located at the opening of the clamp shell, and the spring is tightly pressed below the metal ball.

9. The apparatus for detecting a plurality of microorganisms in a food product according to claim 5, wherein: the front surface of the housing is made of ultraviolet-proof glass.

10. The apparatus for detecting a plurality of microorganisms in a food product according to claim 5, wherein: mix the ware top and be provided with the inlet, mix the ware below and install the liquid outlet, be provided with the ball valve in the liquid outlet, the handle control of ball valve through running through the casing.

Technical Field

The invention relates to the technical field of microorganism detection, in particular to a method and a device for detecting various microorganisms in food.

Background

With the continuous improvement of living standard of people, food safety problem receives more and more attention, whether the microorganism in food exceeds standard or not guarantees the important index of food safety. The traditional food microorganism detection adopts a laboratory culture method, namely, bacterial colonies are cultured on a culture medium, and then whether the content of microorganisms exceeds the standard or not is detected by observing the number of the bacterial colonies. The detection of the laboratory culture method has high requirements on the operation level of laboratory staff and instrument equipment, and in some basic level working units, because the operation level of the staff is not high and the instrument equipment does not reach the standard, when the microbial detection in food is carried out, mixed bacteria are easily mixed in the experiment, thereby causing the inaccurate detection result.

Disclosure of Invention

The invention aims to provide a method and a device for detecting various microorganisms in food, which are used for solving the problem that detection results of some basic working units are inaccurate due to condition limitation.

In order to achieve the purpose, the invention adopts the following technical scheme:

a method for detecting a plurality of microorganisms in a food product, comprising: the method comprises sterilizing a mixing vessel, and sampling food to be tested and placing into the mixing vessel; adding a diluent into a mixing dish, diluting a food sample to be detected, wherein the ratio of the sample to the diluent is 1: 10, obtaining a sample diluent; sterilizing the culture dishes, and then respectively adding culture mediums for culturing different types of target microorganisms into different culture dishes; adding chromogenic compounds into the culture dishes added with the microbial culture medium respectively; carrying out sterile liquid separation on the diluted sample diluent through a liquid separation container, and equivalently separating the sample diluent into different culture dishes; heating the culture dish to enable the culture dish to be at 35-37 ℃ for culture for 24-36 h; after the culture is finished, determining whether the target microorganism exists in each culture dish through the color reaction in each culture dish; and taking out the culture dish, placing the culture dish under a microscope for observation, and calculating the content of the target microorganism.

In the method for detecting various microorganisms in food, the sample is diluted by the mixing dish, and then the equivalent sample diluent is added into the sterilized culture dish by the sterile liquid separation method, so that the detection result deviation caused by the mixed bacteria in the operation process can be effectively avoided; through target microorganism culture medium and the chromogenic compound that add in the culture dish, can make and cultivate out the target microorganism in the culture dish, restrain non-target microorganism growth simultaneously to discharge experiment interference, simultaneously, chromogenic compound can audio-visually demonstrate whether have the target microorganism in the culture dish, make the experimental result more obvious, more do benefit to the observation.

As a preferable scheme of the detection method, the diluent adopts a balanced salt solution which can be suitable for the growth of various microorganisms, and the detection method has the advantages of simple formula and low cost.

As a preferable scheme of the detection method, the culture medium provides nutrient substances for the target microorganisms, can inhibit the growth of other microorganisms, and can effectively avoid the interference of non-target microorganisms in the culture medium on the detection experiment result.

As a preferable scheme of the detection method, the color development compound is prepared by mixing bromothymol blue and xylenol blue.

In addition, the invention also provides a device for detecting various microorganisms in food, which comprises a shell, wherein a cover plate is movably connected above the shell, a wastewater tank outlet is arranged below the front surface of the shell, and a wastewater tank is arranged in the wastewater tank outlet; a culture dish outlet is arranged above the outlet of the wastewater tank, a support plate is arranged inside the culture dish outlet, a culture dish support is placed on the support plate, and a culture dish is placed in the culture dish support; sliding chutes are formed in the left side wall and the right side wall of the shell, sliding plates are mounted inside the sliding chutes on the left side and the right side, the left side and the right side of each sliding plate are connected with the edges of the sliding chutes in a sealing mode through rubber telescopic sleeves, and a layered partition plate is fixedly mounted between the two sliding plates; a mixing vessel is fixedly mounted on the upper side inside the shell, the lower part of the mixing vessel is communicated with liquid separating containers through a guide pipe, adjacent liquid separating containers are communicated through a communicating pipe, a liquid outlet pipe of each liquid separating container penetrates through the layered partition plate and then is positioned above the culture vessel, and a clamping device is arranged in each layered partition plate and used for controlling the opening and closing of the liquid outlet pipe; inside rear side fixed mounting of casing has the ultraviolet disinfection lamp, the ventilating fan is installed to the casing lateral wall, the inboard fixed mounting of ventilating fan has the heater strip, the ventilating fan outside is provided with air filter, fixed mounting has singlechip and temperature sensor on the lateral wall of culture dish support upside.

In the device for detecting various microorganisms in food, the sample diluent is placed into the culture dish through the mixing dish, the conduit and the liquid separating container, the whole process is operated in a closed space, no additional manual operation is needed, and the mixing of external bacteria can be effectively avoided; the adjacent liquid separation containers are connected through the communicating pipe, so that the liquid levels in all the liquid separation containers can be raised, the equal amount of sample diluent in each liquid separation container is ensured, and the accuracy of the detection result of the content of each microorganism is ensured; through heater strip, ventilation fan, singlechip and the temperature sensor who sets up, can provide constant temperature's environment when cultivateing the microorganism, guarantee simultaneously that sufficient oxygen supplies the microorganism to grow, through air filter's setting, can effectively filter the microorganism in the outside air, improve the experiment accuracy.

As an improvement of the detection device, the interior of the layered partition plate is of a cavity structure, a core plate is arranged in the layered partition plate, the length of the core plate is longer than that of the layered partition plate, the left end and the right end of the core plate penetrate through the two sliding plates, the rear parts of the sliding plates are fixedly connected with pressing blocks, the core plate and the layered partition plate are provided with through holes, the liquid outlet pipe is placed in the through holes, the liquid outlet pipe can be moved left and right through pushing the core plate, the liquid conveying pipe can be clamped or loosened through the core plate, and therefore opening and closing of.

As a further improvement of the detection device, a first limit groove is formed in the right end of the core plate, a second limit groove is formed in the left end of the core plate, a first limit clamp is arranged inside the right sliding plate, a second limit clamp is arranged inside the left sliding plate, and the first limit clamp is clamped into the first limit groove by pushing the core plate leftwards, so that the liquid outlet pipe can be kept in a closed state; the second limiting clamp can be clamped into the second limiting groove by pushing the core plate rightwards, so that the liquid outlet pipe is kept in an open state.

As a further improvement of the detection device, the first limiting clamp and the second limiting clamp are both composed of a clamping shell, a spring and a metal ball, the spring is located at the bottom of the clamping shell, the metal ball is located at the opening of the clamping shell, the spring is pressed below the clamping shell, when the core plate moves left and right, the metal ball is stressed to roll, so that the metal ball can be separated from the limiting groove, and when the metal ball on the other side rolls to the limiting groove, the metal ball can be bounced into the limiting groove to be clamped and limited under the action of the spring.

As an optimal scheme of the detection device, the front surface of the shell is made of ultraviolet-proof glass, so that the ultraviolet disinfection lamp can be effectively prevented from harming an operator during disinfection, and the operator can be favorably observed for internal operation.

As an optimal scheme of this detection device, mix the ware top and be provided with the inlet, mix the ware below and install the liquid outlet, be provided with the ball valve in the liquid outlet, the handle control of ball valve through running through the casing.

In conclusion, the detection method can effectively avoid the influence of the mixed bacteria on the detection result in the detection process, can enable the observation of whether the target microorganism exists to be more obvious and intuitive, has lower operation requirements on basic level workers, and is beneficial to the adoption of the basic level workers; the detection device can effectively avoid the influence of mixed bacteria on the detection result, can ensure oxygen required by the growth of microorganisms, is simple and convenient to use, can effectively make up the defect that basic level instruments and equipment do not reach the standard, and is convenient for basic level workers to use.

Drawings

FIG. 1 is a front sectional view of the detecting unit of the present invention.

FIG. 2 is a left side sectional view of the detecting device of the present invention.

FIG. 3 is an enlarged view of the inspection device of the present invention at A.

FIG. 4 is a control logic diagram of the detecting device of the present invention.

FIG. 5 is an enlarged view of the layered separator of the detecting unit of the present invention.

In the figure: the device comprises a shell 1, a cover plate 1-1, a culture dish outlet 1-2, a waste water groove outlet 1-3, a sliding groove 1-4, a support plate 1-5, a culture dish support 1-6, a mixing dish 2, a liquid inlet 2-1, a liquid outlet 2-2, a ball valve 3, a handle 3-1, a conduit 4, a liquid separating container 5, a layering partition plate 6, a core plate 6-1, a through hole 6-2, a limiting groove I6-3, a pressing block 6-4, a limiting groove II 6-5, a sliding plate 7-1, a limiting clamp II 7-2, a limiting clamp I7-2, a culture dish 8, a waste water groove 9, an ultraviolet disinfection lamp 10, a singlechip 11, a temperature sensor 12, a heating wire 13, a ventilating fan 14 and an air filter element 15.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

In the description of the present invention, it is to be understood that the terms "above", "below", "left", "right", "inside", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

A method for detecting a plurality of microorganisms in a food product, comprising the steps of:

s1, the mixing dish 2 is disinfected, no microorganism exists in the mixing dish 2, interference to an experimental result is avoided, and food to be detected is sampled and placed into the mixing dish 2.

S2, adding balanced salt solution into the mixing dish 2 to dilute the food sample to be tested, wherein the ratio of the sample to the balanced salt solution is 1: and 10, obtaining a sample diluent for subsequent detection.

S3, sterilizing the culture dish 8, and then adding Brilliant green lactose bile salt broth for culturing Escherichia coli, RV broth for culturing Salmonella, malt extract liquid for culturing yeast, etc. to the different culture dishes 8, respectively, to culture the target microorganism in the culture dishes 8 while inhibiting the growth of other non-target microorganisms.

S4, adding a color developing agent prepared by mixing bromothymol blue and xylenol blue into the culture dish 8 added with different kinds of microorganism culture media respectively, wherein the bromothymol blue accounts for 1 wt%, the xylenol blue accounts for 0.01 wt%, the culture dish contains target microorganisms, and the color developing compound is bright yellow after culture.

And S5, performing sterile liquid separation on the diluted sample diluent through the liquid separation container 5, and equally dividing the sample diluent into different culture dishes 8.

S6, heating the culture dish 8 to enable the culture dish 8 to be cultured at the temperature of 35-37 ℃, wherein the culture time is 24 hours, and the culture time can be prolonged to 36 hours in order to ensure the propagation of the microorganisms.

And S7, observing the color reaction in each culture dish 8 after the culture is finished to determine whether the target microorganism exists in the culture dish, wherein if the yellow color is shown in the culture dish 8, the target microorganism is contained.

S8, the culture dish 8 is taken out and placed under a microscope for observation, and the content of the target microorganism in each culture dish 8 is calculated.

Referring to fig. 1-5, a device for detecting various microorganisms in food comprises a housing 1, a cover plate 1-1 is movably connected above the housing 1, a wastewater tank outlet 1-3 is arranged below the front surface of the housing 1, and a wastewater tank 9 is arranged in the wastewater tank outlet 1-3; a culture dish outlet 1-2 is arranged above the wastewater groove outlet 1-3, a support plate 1-5 is arranged inside the culture dish outlet 1-2, a culture dish support 1-6 is arranged on the support plate 1-5, and a plurality of culture dishes 8 are arranged in the culture dish support 1-6.

The left side wall and the right side wall of the shell 1 are respectively provided with a sliding chute 1-4, sliding plates 7 are respectively arranged in the sliding chutes 1-4 on the left side and the right side, and the left side and the right side of each sliding plate 7 are in sealing connection with the edges of the sliding chutes 1-4 where the sliding plate is located through rubber telescopic sleeves, so that the sealing performance in the shell 1 is ensured. A layering partition plate 6 is fixedly installed between the two sliding plates 7, a core plate 6-1 is arranged inside the layering partition plate 6, the length of the core plate 6-1 is longer than that of the layering partition plate 6, the core plate 6-1 can move left and right in the layering partition plate 6, and the left end and the right end of the core plate 6-1 penetrate through the two sliding plates 7 and are fixedly connected with pressing blocks 6-4; the core plate 6-1 is provided with a first limiting groove 6-3 at the right end, a second limiting groove 6-5 at the left end and a first limiting clamp 7-2 inside a sliding plate 7 at the right side, and when the core plate 6-1 is pushed leftwards, the core plate 6-1 moves leftwards until the first limiting clamp 7-2 is clamped in the first limiting groove 6-3; a second limit clamp 7-1 is arranged in the sliding plate 7 on the left side, and when the core plate 6-1 is pushed rightwards, the core plate 6-1 moves rightwards until the second limit clamp 7-1 is clamped in the second limit groove 6-5. As the core plate 6-1 and the layered partition plate 6 are provided with the through holes 6-2, and the liquid outlet pipe is arranged in the through holes 6-2, when the limiting clamp I7-2 is clamped in the limiting groove I6-3, the core plate 6-1 and the through holes 6-2 of the layered partition plate 6 are staggered, and the liquid outlet pipe is closed under the extrusion of the core plate 6-1. When the second limiting clamp 7-1 is clamped into the second limiting groove 6-5, the core plate 6-1 and the through hole 6-2 of the layered partition plate 6 are concentric, and the liquid outlet pipe is not extruded by the core plate 6-1 and is in an open state.

A mixing vessel 2 is fixedly arranged at the upper side in the shell 1, a liquid inlet 2-1 is arranged above the mixing vessel 2, a liquid outlet 2-2 is arranged below the mixing vessel 2, a ball valve 3 is arranged in the liquid outlet 2-2, and the ball valve 3 is controlled by a handle 3-1 positioned at the outer side of the shell 1. The liquid outlet 2-2 of mixing ware 2 is linked together through pipe 4 and branch liquid container 5, is linked together through communicating pipe between the adjacent branch liquid container 5, and the drain pipe of dividing liquid container 5 runs through and lies in 8 tops of culture dish behind the layering baffle 6, is provided with clamping device in the layering baffle 6 for controlling opening and shutting of drain pipe.

An ultraviolet disinfection lamp 10 is fixedly arranged at the rear side in the shell 1 and is used for disinfecting the mixing vessel 2, the guide pipe 4, the liquid separation container 5 and the culture vessel 8 in the shell 1; a ventilation fan 14 is installed on the side wall of the shell 1 to ventilate the shell 1 and ensure oxygen required during microorganism culture, and a heating wire 13 is fixedly installed on the inner side of the ventilation fan 14 to improve the temperature inside the shell 1 and ensure the stable environment temperature of the microorganism culture, so that the microorganism culture is facilitated; an air filter element 15 is arranged outside the ventilation fan 14 and used for filtering microorganisms in the outside air, so that the influence of the outside microorganisms on the microorganisms in the shell 1 is avoided; the single chip microcomputer 11 and the temperature sensor 12 are fixedly mounted on the side wall of the upper side of the culture dish support 1-6, the temperature sensor 12 is used for measuring the temperature of the culture dish 8, the heating wire 13 is controlled by the single chip microcomputer 11 to be heated, when the specified temperature is reached, the heating wire 13 is controlled by the single chip microcomputer 11 to stop heating, and therefore the constant temperature inside the shell 1 is guaranteed.

In a preferred embodiment, the first limit card 7-2 and the second limit card 7-1 are both composed of a card shell, a spring and a metal ball, the spring is positioned at the bottom of the card shell, the metal ball is positioned at the opening of the card shell, the spring is pressed below the card shell, when the core plate 6-1 moves left and right, the metal ball is stressed to roll, so that the metal ball can be separated from the limit groove, and when the metal ball on the other side rolls to the limit groove, the metal ball can be bounced into the limit groove to be clamped and limited under the action of the spring.

In a preferred embodiment, the single chip microcomputer 11 is an STC89C51 single chip microcomputer, and the temperature sensor 12 is a model WZP-100.

In use, the sample is first placed in the mixing dish 2, and then the balanced salt solution is added to the mixing dish 2 for dilution. After the culture dish 8 is taken out and put into culture media such as Brilliant green lactose bile broth, RV broth, malt extract liquid and the like, respectively, the culture dish 8 is put into the culture dish support 1-6, the culture dish support 1-6 is pushed into the support plate 1-5 from the culture dish outlet 1-2, and the right end of the culture dish support 1-6 is sealed at the culture dish outlet 1-2. Later open ball valve 3, the sample diluent flows out through ball valve 3 this moment to in pipe 4 flows into different minute liquid container 5 respectively, because all link to each other through communicating pipe between minute liquid container 5, consequently the diluent when flowing into minute liquid container 5, the liquid level in minute liquid container 5 can remain the level all the time, has consequently also guaranteed the sample diluent equivalent in every minute liquid container 5. Then, the core plate 6-1 is pushed rightwards by the pressing block 6-4, so that the liquid outlet pipes of the liquid separation containers 5 are opened, and at the moment, the sample diluent in each liquid separation container 5 flows into the culture dish below the liquid separation container. Then, the electric energy can be supplied, the ventilating fan 14, the heating wire 13, the temperature sensor 12 and the singlechip 11 are controlled to work through the control panel, the culture time can be preset through the singlechip 11, the temperature sensor 12 monitors the temperature of the culture dish 8 at any time, the singlechip 11 transmits signals, and the singlechip 11 controls the heating wire 13 to run and stop, so that the temperature in the shell 1 is kept constant. After the culture is finished, whether the target microorganism is contained in the culture dish 8 or not can be known by observing the color reaction in each culture dish, and if the content of the microorganism needs to be measured, the microorganism is taken out and placed under a microscope for observation and counting.

After the use is finished, alcohol is added into the mixing dish 2 for disinfection, the alcohol is statically stirred into the liquid separation container 5 through the guide pipe 4, the sliding plate 7 is moved backwards, the liquid separation container 5 is separated from the upper part of the culture dish 8 and stops at an opening at the rear part of the support plate 1-5, and then a liquid outlet pipe of the liquid separation container 5 is opened through the core plate 6-1. At this point, alcohol will flow out through the outlet pipe and through the opening in the rear of the support plate 1-5 into the waste water tank 9 below, thereby completing the disinfection of the device. The waste water tank 9 is taken out, poured and then returned. The ultraviolet disinfection lamp 10 is started through the control panel to disinfect the mixing dish 2, the guide pipe 4, the liquid separation container 5, the culture dish 8 and the wastewater tank 9, so that the next detection can be conveniently carried out.

Further, the above-mentioned fixed connection and fixed mounting are to be understood in a broad sense unless otherwise specifically stated or limited, and may be, for example, welding, gluing, or integrally formed, as is conventional in the art.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.