CN111504562A

CN111504562A - Detection device based on hub curling production and use method thereof

Info

Publication number: CN111504562A
Application number: CN202010330437.7A
Authority: CN
Inventors: 张东海
Original assignee: Beijing Hengchangtai Construction Engineering Co ltd
Current assignee: INNER MONGOLIA HUATANG ALUMINUM Co.,Ltd.; Inner Mongolia Huatang Durui wheel hub Co., Ltd
Priority date: 2020-04-24
Filing date: 2020-04-24
Publication date: 2020-08-07
Anticipated expiration: 2040-04-24
Also published as: CN111504562B

Abstract

The invention discloses a detection device based on hub curling production and a use method thereof, belonging to the technical field of hub production, the detection device based on hub curling production and the use method thereof, the scheme is that through the release of carbon dioxide gas in a storage air bag, the carbon dioxide gas enters an annular air bag through a connecting hole and pushes an inflating valve open to enter a groove, the gas leaked from the gap between a hub and a cylinder blows magnetic powder at the edge of the hub, part of the blown magnetic powder is adhered by transparent double-sided adhesive tape, the position of the magnetic powder on an annular scale bar is observed through an external connecting ring to mark on transparent marking paper, through the simulation of tire leakage detection in the prior art, the hub, the carbon dioxide and the magnetic powder sequentially correspond to a tire, water and bubbles, the position of tire breakage is judged through the emergence of the bubbles, therefore, the distribution condition of the gap between the hub and the cylinder can be judged by means of the distribution of the magnetic powder, thereby conveniently carry out the maintenance of accuracy to wheel hub.

Description

Detection device based on hub curling production and use method thereof

Technical Field

The invention relates to the technical field of hub production, in particular to a detection device based on hub curling production and a use method thereof.

Background

The hub is also called the rim. According to the characteristics and requirements of different vehicle types, the hub surface treatment process can also adopt different modes, and can be roughly divided into two modes of paint baking and electroplating. The wheel hub of the common vehicle type has less consideration on the appearance, the good heat dissipation is a basic requirement, the process basically adopts baking finish treatment, namely, firstly spraying and then baking, the cost is more economic, the color is beautiful, the retention time is long, and the color of the wheel hub is still unchanged even if the vehicle is scrapped. The surface treatment process of many popular vehicle type wheel hubs is baking finish. Some colorful hubs which are fashionable, antecedent and dynamic are also applied by a paint baking technology. The hub has moderate price and complete specification. The electroplating hub is divided into the types of electric plating silver, water electroplating, pure electroplating and the like.

The manufacturing method of the aluminum alloy hub comprises three methods: gravity casting, forging and low-pressure precision casting.

1. The gravity casting method utilizes gravity to pour the aluminum alloy solution into the mold, and the aluminum alloy solution is processed and polished by a lathe after being formed, so that the production can be completed. The manufacturing process is simple, a precise casting process is not needed, the cost is low, the production efficiency is high, but air bubbles (sand holes) are easily generated, the density is uneven, and the surface smoothness is not enough. The wheel hub produced by the method is matched with a corresponding vehicle model, mainly the vehicle model produced in the early period is provided, and the new vehicle model is mostly replaced by the new wheel hub.

2. The forging method has the advantages that the whole aluminum ingot is directly extruded and formed on a die by a kiloton press, the density is uniform, the surface is smooth and delicate, the wall of the hub is thin, the weight is light, the material strength is highest, the yield is higher than that of a casting method by more than three times, but the production cost is higher because of the requirement of more excellent production equipment and the yield is only five to six times.

3. The low-pressure precision casting method is used for precision casting under the low pressure of 0.1Mpa, the casting mode has good formability, clear outline, uniform density and smooth surface, can achieve high strength and light weight, can control the cost, has the yield of more than nine times, and is the mainstream manufacturing method of the high-quality aluminum alloy hub.

At present, after the heat setting of the wheel hub is finished, the size of the wheel hub with part has errors, so that a certain gap is formed between the wheel hub and the barrel, but human eyes are difficult to distinguish when detecting, so that the production quality of the wheel hub is not up to the standard.

Disclosure of Invention

1. Technical problem to be solved

Aiming at the problems in the prior art, the invention aims to provide a detection device based on hub curling production and a using method thereof, which can realize the scheme that the carbon dioxide gas in a storage air bag is released, the carbon dioxide gas enters an annular air bag through a connecting hole and pushes an air valve open to enter a groove, the magnetic powder at the edge of a hub is blown up by the gas leaked from the gap between the hub and a cylinder body, part of the blown-up magnetic powder is adhered by a transparent double-sided adhesive tape, the position of the magnetic powder on an annular scale strip is observed through an outer connecting ring to be marked on a transparent marking paper, the hub, the carbon dioxide and the magnetic powder sequentially correspond to a tire, water and bubbles through the simulation of tire leakage detection in the prior art, the broken position of the tire is judged through the emergence of the bubbles, so the distribution condition of the gap between the hub and the cylinder body can be judged by means of the distribution of the, thereby conveniently carry out the maintenance of accuracy to wheel hub.

2. Technical scheme

In order to solve the above problems, the present invention adopts the following technical solutions.

A detection device based on hub curling production comprises a hub and a barrel, wherein the hub is positioned in the barrel and is abutted against the inner wall of the barrel, a groove is formed in the outer end of the hub, an annular air bag is fixedly connected to the inner wall of the barrel, a connecting hole in the annular air bag is formed in the inner wall of the barrel, a connecting barrel outside the connecting hole is fixedly connected to the outer end of the barrel, a storage air bag is arranged at the outer end of the connecting barrel, the annular air bag is positioned in the groove, a release hole provided with an air valve is formed in the outer end of the annular air bag in a chiseled mode, an upper cover plate on the upper side of the hub is arranged in the barrel, an outer connecting ring in contact with the inner wall of the barrel is fixedly connected to the outer end of the upper cover plate, a plurality of uniformly distributed partition plates are fixedly connected to the bottom of the outer connecting ring, a first filter screen is fixedly, and the transparent double faced adhesive tape is positioned between every two adjacent partition plates, a circle of magnetic powder is arranged at the upper end of the hub, the magnetic powder surrounds the outer edge of the hub, carbon dioxide gas in the storage air bag is released and enters the annular air bag through the connecting hole, and the carbon dioxide gas pushes the inflating valve open to enter the groove when passing through the releasing hole.

Furthermore, the upper end of the upper cover plate is provided with a through hole, the upper end of the upper cover plate is fixedly connected with an air guide cylinder positioned outside the through hole, a rotating shaft is fixedly connected between the front inner wall and the rear inner wall of the air guide cylinder, the outer end of the rotating shaft is rotatably connected with a rotating sleeve, connecting plates are fixedly connected to the left end and the right end of the rotating sleeve respectively, purple litmus test paper is adhered to the upper end and the lower end of each connecting plate, carbon dioxide blows the connecting plates when passing through the air guide cylinder along with continuous flowing of air, the connecting plates can rotate, the purple litmus test paper is made to be red by purple through contact of carbon dioxide and moist purple litmus test paper, and whether the purple litmus test paper is red or not can be judged by judging whether a gap.

Further, the bottom side of the wheel hub is provided with a lower cover plate which is abutted to the inner wall of the cylinder body, the diameter of the lower cover plate is larger than the inner diameter of the cylinder body, a pair of annular electromagnets which are symmetrical about the wheel hub are arranged inside the cylinder body, the annular electromagnets are located on the outer side of magnetic powder, and after the detection of the wheel hub is finished, the magnetic powder adhered to the bottom of the transparent double-faced adhesive tape can be adsorbed by starting the annular electromagnets, so that the magnetic powder and the transparent double-faced adhesive tape are separated to be conveniently detected.

Furthermore, annular clamping groove is dug to storage gasbag outer end, the joint has the rubber band in the annular clamping groove, through setting up annular clamping groove and rubber band, can be so that be connected more stable between storage gasbag and the connecting cylinder for carbon dioxide gas in the storage gasbag is difficult for leaking from the gap between storage gasbag and the connecting cylinder when releasing.

Further, the storage air bag is filled with carbon dioxide gas, the outer connecting ring is made of transparent rubber materials, carbon dioxide gas is arranged in the storage air bag, the wet purple litmus test paper can be made to become red through the carbon dioxide gas, whether a gap exists between the hub and the barrel body is judged, the outer connecting ring is made of the transparent rubber materials, and the distribution of magnetic powder can be conveniently judged.

Further, the mounting groove has been dug to outer go-between upper end, bottom end fixedly connected with annular scale strip and transparent mark paper in the mounting groove, annular scale strip is located the transparent mark paper outside, through setting up annular scale strip and transparent mark paper, can be through observing the position that the magnetic distributes, can conveniently mark the position that the magnetic distributes through setting up transparent mark paper.

Further, the gas cylinder inner wall fixedly connected with is located the second filter screen of connecting plate downside, the second filter screen is made by 430-stainless steel, first filter screen has 310-stainless steel to make, second filter screen and first filter screen surface all scribble and are equipped with anti-rust paint, through setting up the second filter screen, can reduce a small amount of magnetic and pass through carbon dioxide gas's flow and exhaust possibility, make the second filter screen through using 430-stainless steel, can make second filter screen and magnetic adsorb each other, make first filter screen through using 310-stainless steel, can make first filter screen be difficult for adsorbing mutually with the magnetic to make the magnetic that is located transparent double faced adhesive tape bottom adhesion difficult be adsorbed to first filter screen on.

The use method of the detection device based on the hub curling production comprises the following steps:

s1, releasing carbon dioxide gas in the storage air bag, wherein the carbon dioxide gas enters the annular air bag through the connecting hole and pushes the inflating valve to enter the groove;

s2, blowing up magnetic powder at the edge of the hub by gas leaked from the gap between the hub and the cylinder, adhering part of the blown-up magnetic powder to the transparent double-sided adhesive tape, marking the magnetic powder on the transparent marking paper at the position of the annular scale strip, blowing the connecting plate by carbon dioxide gas when the carbon dioxide gas passes through the gas guide cylinder along with the continuous flow of the gas, enabling the connecting plate to rotate, and enabling the purple litmus test paper to be converted from purple to red by the contact of the carbon dioxide and the wet purple litmus test paper;

s3, after the hub is detected, the magnetic powder adhered to the bottom of the transparent double-faced adhesive tape can be adsorbed by starting the annular electromagnet, so that the magnetic powder and the transparent double-faced adhesive tape are separated to be detected again conveniently.

3. Advantageous effects

Compared with the prior art, the invention has the advantages that:

this scheme is through the release to the carbon dioxide gas in the storage gasbag, carbon dioxide gas enters into in the annular gasbag through the connecting hole, and push up the inflating valve and enter into in the recess, the gas that spills from wheel hub and barrel gap blows up the magnetic at wheel hub edge, the magnetic that partly blows up is adhered by transparent double faced adhesive tape, observe the magnetic through outer go-between and make the mark on annular scale strip position on transparent mark paper, through the simulation to tire leak hunting among the prior art, wheel hub, carbon dioxide and magnetic in proper order with the tire, water, the bubble corresponds each other, the position of judging the tire rupture through the emergence of blister, consequently, with the help of the distribution of magnetic, can judge the gap distribution situation between wheel hub and the barrel, thereby the maintenance of accuracy is carried out to wheel hub to the convenience.

Drawings

FIG. 1 is a cross-sectional view of the entirety of the present invention;

FIG. 2 is a schematic view of the structure at A in FIG. 1;

FIG. 3 is a schematic view of the structure at B in FIG. 1;

FIG. 4 is a schematic view of the structure at C in FIG. 1;

FIG. 5 is a cross-sectional view of a portion of the storage bladder of the present invention;

FIG. 6 is a schematic diagram of the structure of the magnetic powder distribution of the present invention;

FIG. 7 is a schematic structural view of the bottom of the upper cover plate of the present invention;

FIG. 8 is a schematic structural view of the top of the upper cover plate of the present invention;

fig. 9 is a schematic diagram of a prior art tire leak detection configuration.

The reference numbers in the figures illustrate:

1 hub, 2 cylinder bodies, 201 connecting holes, 202 connecting cylinders, 203 storage air bags, 204 annular clamping grooves, 205 rubber rings, 206 lower cover plates, 207 annular electromagnets, 3 grooves, 4 annular air bags, 5 release holes, 6 inflating valves, 7 upper cover plates, 8 outer connecting rings, 801 mounting grooves, 802 annular scale strips, 803 transparent marking paper, 9 partition plates, 10 first filter screens, 11 transparent double-sided adhesive, 12 magnetic powder, 13 through holes, 14 air guide cylinders, 1401 second filter screens, 15 rotating sleeves, 16 connecting plates and 17 purple litmus test paper.

Detailed Description

The drawings in the embodiments of the invention will be combined; the technical scheme in the embodiment of the invention is clearly and completely described; obviously; the described embodiments are only some of the embodiments of the invention; but not all embodiments, are based on the embodiments of the invention; all other embodiments obtained by a person skilled in the art without making any inventive step; all fall within the scope of protection of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification 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. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1:

referring to fig. 1-8, a detecting device based on hub curling production comprises a hub 1 and a barrel 2, the hub 1 is located in the barrel 2 and is abutted against the inner wall of the barrel 2, the outer end of the hub 1 is provided with a groove 3, the inner wall of the barrel 2 is fixedly connected with an annular air bag 4, the inner wall of the barrel 2 is provided with a connecting hole 201 located in the annular air bag 4, the outer end of the barrel 2 is fixedly connected with a connecting barrel 202 located outside the connecting hole 201, the outer end of the connecting barrel 202 is provided with a storage air bag 203, the annular air bag 4 is located in the groove 3, the annular air bag 4 and the storage air bag 203 are both made of rubber materials, the outer end of the annular air bag 4 is provided with a release hole 5 provided with an air valve 6, an upper cover plate 7 located on the upper side of the hub 1 is arranged in the barrel 2, the outer end of the upper cover plate 7 is fixedly connected, the magnetic powder 12 at the edge of the hub 1 is divided into a plurality of parts by a plurality of division plates 9, each part is positioned between two adjacent division plates 9, whether a gap exists between the two division plates 9 corresponding to the part between the hub 1 and the barrel 2 is judged by observing whether the magnetic powder 12 between the two division plates 9 is blown to the transparent double-sided adhesive tape 11 or not during detection, a first filter screen 10 is fixedly connected between each two adjacent division plates 9, a plurality of transparent double-sided adhesive tapes 11 which are uniformly distributed are fixedly connected at the bottom end of the outer connecting ring 8, the transparent double-sided adhesive tape 11 is positioned between each two adjacent division plates 9, a circle of magnetic powder 12 is arranged at the upper end of the hub 1, the diameter of the magnetic powder is 60 mu m, the magnetic powder 12 surrounds the outer edge of the hub 1, and carbon dioxide enters the annular air bag 4 through the connecting hole 201 by releasing the carbon dioxide in the, on passing through the release orifice 5, the carbon dioxide gas pushes the valve mouth 6 open into the recess 3.

Referring to fig. 1-4, a through hole 13 is drilled at the upper end of an upper cover plate 7, an air guide tube 14 located outside the through hole 13 is fixedly connected to the upper end of the upper cover plate 7, a rotating shaft is fixedly connected between the front and rear inner walls of the air guide tube 14, a rotating sleeve 15 is rotatably connected to the outer end of the rotating shaft, a connecting plate 16 is fixedly connected to each of the left and right ends of the rotating sleeve 15, purple litmus test paper 17 is adhered to each of the upper and lower ends of the connecting plate 16, and along with the continuous flow of air, carbon dioxide air blows the connecting plate 16 when passing through the air guide tube 14, so that the connecting plate 16 can rotate, and the purple litmus test paper 17 is contacted with the wet purple litmus test paper 17 through carbon dioxide, so that the purple litmus test paper 17 is changed from purple to red, and whether a gap exists between the whole hub 1 and the barrel, wheel hub, carbon dioxide and magnetic correspond with tire, water, bubble each other in proper order, through the emergence of bubble judge the cracked position of tire, consequently with the help of the distribution of magnetic, can judge the gap distribution situation between wheel hub 1 and the barrel 2 to the convenience carries out the maintenance of accuracy to wheel hub 1.

Referring to fig. 1-3, a lower cover plate 206 abutting against the inner wall of the cylinder 2 is disposed at the bottom side of the hub 1, the diameter of the lower cover plate 206 is larger than the inner diameter of the cylinder 2, a pair of annular electromagnets 207 symmetrical with respect to the hub 1 are installed inside the cylinder 2, the annular electromagnets 207 are located outside the magnetic powder 12, and after the hub 1 is inspected, the magnetic powder 12 adhered to the bottom of the transparent double-sided adhesive tape 11 can be adsorbed by starting the annular electromagnets 207, so that the magnetic powder 12 and the transparent double-sided adhesive tape 11 can be separated and conveniently inspected again.

Referring to fig. 1 and 5, an annular clamping groove 204 is formed in the outer end of the storage airbag 203, a rubber ring 205 is clamped in the annular clamping groove 204, the connection between the storage airbag 203 and the connecting cylinder 202 is more stable by arranging the annular clamping groove 204 and the rubber ring 205, so that when carbon dioxide in the storage airbag 203 is released, the carbon dioxide is not easy to leak from a gap between the storage airbag 203 and the connecting cylinder 202, carbon dioxide is filled in the storage airbag 203, the outer connecting ring 8 is made of a transparent rubber material, and by arranging carbon dioxide in the storage airbag 203, whether a gap exists between the hub 1 and the cylinder 2 can be judged by the property that wet purple litmus paper turns red through the carbon dioxide, and by manufacturing the outer connecting ring 8 by using a transparent rubber material, the distribution of the magnetic powder 12 can be conveniently judged.

Referring to fig. 3-4, the upper end of the outer connection ring 8 is chiseled with an installation groove 801, the inner bottom end of the installation groove 801 is fixedly connected with an annular scale bar 802 and a transparent marking paper 803, the annular scale bar 802 is positioned outside the transparent marking paper 803, the position of magnetic powder distribution can be observed by arranging the annular scale bar 802 and the transparent marking paper 803, the position of magnetic powder distribution can be conveniently marked by arranging the transparent marking paper 803, the inner wall of the gas guide tube 14 is fixedly connected with a second filter screen 1401 positioned at the lower side of the connection plate 16, the second filter screen 1401 is made of 430-stainless steel, the first filter screen 10 is made of 310-stainless steel, the surfaces of the second filter screen 1401 and the first filter screen 10 are both coated with anti-rust paint, the second filter screen 1401 is arranged to reduce the possibility that a small amount of magnetic powder is discharged by the flow of carbon dioxide gas, the second filter screen 1401, the second filter screen 1401 and the magnetic powder can be adsorbed to each other, and the first filter screen 10 is made of 310-stainless steel, so that the first filter screen 10 is not easily adsorbed to the magnetic powder, and the magnetic powder adhered to the bottom of the transparent double-sided adhesive tape 11 is not easily adsorbed to the first filter screen 10.

s1, releasing carbon dioxide in the storage airbag 203, wherein the carbon dioxide enters the annular airbag 4 through the connecting hole 201 and pushes the valve 6 open to enter the groove 3;

s2, blowing the magnetic powder 12 at the edge of the hub 1 by the gas leaked from the gap between the hub 1 and the cylinder 2, adhering part of the blown magnetic powder 12 by the transparent double-sided adhesive tape 11, marking the transparent marking paper 803 by the position of the magnetic powder on the annular scale strip 802, blowing the connecting plate 16 by the carbon dioxide gas when passing through the gas guide tube 14 along with the continuous flow of the gas, so that the connecting plate 16 can rotate, and contacting the wet purple litmus paper 17 by the carbon dioxide to enable the purple litmus paper 17 to be changed from purple to red;

s3, after the hub 1 is detected, the magnetic powder 12 adhered to the bottom of the transparent double-sided adhesive tape 11 can be adsorbed by starting the annular electromagnet 207, so that the magnetic powder 12 and the transparent double-sided adhesive tape 11 are separated to be convenient to detect again.

The above; but are merely preferred embodiments of the invention; the scope of the invention is not limited thereto; any person skilled in the art is within the technical scope of the present disclosure; the technical scheme and the improved concept of the invention are equally replaced or changed; are intended to be covered by the scope of the present invention.

Claims

1. The utility model provides a detection device based on wheel hub production of curling, includes wheel hub (1) and barrel (2), wheel hub (1) are located barrel (2) and offset against barrel (2) inner wall, its characterized in that: the utility model discloses a tire pump, including wheel hub (1), barrel (2) inner wall fixedly connected with annular gasbag (4), barrel (2) inner wall is excavated there is connecting hole (201) that is located annular gasbag (4), barrel (2) outer end fixedly connected with is located connecting cylinder (202) in the connecting hole (201) outside, connecting cylinder (202) outer end is equipped with storage gasbag (203), annular gasbag (4) are located recess (3), the relief hole (5) that are installed with inflating valve (6) are excavated to annular gasbag (4) outer end, be equipped with upper cover plate (7) that are located wheel hub (1) upside in barrel (2), upper cover plate (7) outer end fixedly connected with and barrel (2) inner wall contact's outer go-between (8), outer go-between (8) bottom fixedly connected with a plurality of evenly distributed's division board (9), every adjacent two first filter screen (10) of equal fixedly connected with between division board (9), outer go-between (8) bottom fixedly connected with a plurality of evenly distributed's transparent double faced adhesive tape (11), and transparent double faced adhesive tape (11) are located between every adjacent two division boards (9), wheel hub (1) upper end is equipped with round magnetic (12), the outward flange of wheel hub (1) is encircleed in magnetic (12).

2. The detection device based on hub curling production of claim 1, wherein: the purple litmus paper test paper is characterized in that a through hole (13) is formed in the upper end of the upper cover plate (7), an air guide cylinder (14) located on the outer side of the through hole (13) is fixedly connected to the upper end of the upper cover plate (7), a rotating shaft is fixedly connected between the front inner wall and the rear inner wall of the air guide cylinder (14), the outer end of the rotating shaft is rotatably connected with a rotating sleeve (15), a connecting plate (16) is fixedly connected to the left end and the right end of the rotating sleeve (15), and purple litmus test paper (17) is adhered.

3. The detection device based on hub curling production of claim 1, wherein: the magnetic powder.

4. The detection device based on hub curling production of claim 1, wherein: the outer end of the air storage bag (203) is provided with an annular clamping groove (204), and a rubber ring (205) is clamped in the annular clamping groove (204).

5. The detection device based on hub curling production of claim 1, wherein: the storage air bag (203) is filled with carbon dioxide gas, and the outer connecting ring (8) is made of transparent rubber.

6. The detection device based on hub curling production of claim 1, wherein: outer go up ring (8) upper end and cut installation groove (801), the bottom end fixedly connected with annular scale bar (802) and transparent mark paper (803) in installation groove (801), annular scale bar (802) are located transparent mark paper (803) outside.

7. The detection device based on hub curling production of claim 2, wherein: the inner wall of the air guide cylinder (14) is fixedly connected with a second filter screen (1401) located on the lower side of the connecting plate (16), the second filter screen (1401) is made of 430-stainless steel, the first filter screen (10) is made of 310-stainless steel, and the surfaces of the second filter screen (1401) and the first filter screen (10) are coated with antirust paint.

8. Use method of a hub curl production based detection device according to any one of claims 1 to 9, characterized in that: the method comprises the following steps:

s1, releasing carbon dioxide gas in the storage air bag (203), wherein the carbon dioxide gas enters the annular air bag (4) through the connecting hole (201) and pushes the valve (6) open to enter the groove (3);

s2, blowing up magnetic powder (12) at the edge of the hub (1) by air leaked from a gap between the hub (1) and the cylinder (2), adhering part of the blown-up magnetic powder (12) by a transparent double-sided adhesive tape (11), marking the magnetic powder on transparent marking paper (803) at the position of an annular scale bar (802), blowing the connecting plate (16) by carbon dioxide when the carbon dioxide passes through an air guide tube (14) along with the continuous flow of the air, enabling the connecting plate (16) to rotate, and enabling the purple litmus paper (17) to be in contact with wet purple litmus paper (17) through the carbon dioxide, so that the purple litmus paper (17) is changed from purple to red;

s3, after the hub (1) is detected, the magnetic powder (12) adhered to the bottom of the transparent double-sided adhesive tape (11) can be adsorbed by starting the annular electromagnet (207), so that the magnetic powder (12) and the transparent double-sided adhesive tape (11) are separated to be detected again conveniently.