A detector filter arrangement with an auto-switchable filter

Abstract

The application discloses a detector filter device capable of automatically switching filters and belongs to the technical field of pesticide residue detection. The detector filter device capable of automatically switching filters comprises a filter shell, the filter shell is a hollow structure, circular through holes are formed in the upper side and the lower side of the filter shell in a corresponding manner, a lens is mounted in the circular through hole in the lower side, an adjusting rotating shaft is vertically arranged at the center of the inside of the filter shell, bearings are fixed at the centers of the upper side and the lower side of the filter shell, and the outer wall of the filter shell is fixed with symmetrically arranged first filter structure and second filter structure. The first filter structure and the second filter structure can realize quick switching of two filters, and the surface can be automatically cleaned during the switching process, so that the filter effect is guaranteed. The detector contains two filters, the two filters can be switched according to needs in one detector, the cost is reduced, the detection items of a single detector are increased, the difficulty of not leaking light is overcome, and the utilization rate of the detector is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pesticide detection, in particular to a detector filter device capable of automatically switching filters. BACKGROUND

[0002] The development of agricultural industrialization makes the production of agricultural products more and more dependent on exogenous substances such as pesticides, antibiotics and hormones. The use of pesticides in China's agricultural products is high, and the unreasonable use of these substances will lead to excessive pesticide residues in agricultural products, affecting the safety of consumers, and in severe cases, causing consumers to be ill, abnormal development, and even direct poisoning death. Excessive pesticide residues will also affect the trade of agricultural products. Countries around the world attach great importance to pesticide residues and have set increasingly stringent limit standards for pesticide residues in various agricultural and sideline products, making China's agricultural product exports face severe challenges.

[0003] There are many types of rapid detection methods for pesticide residues, which can be mainly divided into two categories according to their principles: biochemical determination method and chromatographic detection method. Among them, the enzyme inhibition rate method in biochemical determination method has the characteristics of rapidness, sensitivity, simple operation, low cost, etc., and is listed as a national recommended standard method. It has become one of the mainstream technologies for on-site rapid qualitative preliminary screening detection of organophosphorus and carbamate pesticide residues in fruits and vegetables, and has been widely applied. Chromatography is one of the commonly used methods for pesticide residue analysis. It separates the analyte based on the difference in the partition coefficient between the stationary phase and the mobile phase, and converts the concentration of the analyte into an electrical signal (voltage, current, etc.) that is easy to measure, and then sent to the recorder to record. Mainly including thin layer chromatography, gas chromatography and high performance liquid chromatography.

[0004] FPD detector, i.e. flame photometric detector, is a detector with high selectivity and high sensitivity for phosphorus-containing and sulfur-containing compounds. When the sample is burned in a hydrogen-rich flame, phosphorus-containing organic compounds mainly emit light at a wavelength of 526 nm in the form of HPO fragments, and sulfur-containing compounds emit characteristic light at a wavelength of 394 nm in the form of S2 molecules. The photomultiplier tube converts the light signal into an electrical signal, which is recorded after being amplified by a micro-current. The sensitivity of this type of detector can reach tens to hundreds of coulombs per gram, and the detection limit of the flame photometric detector can reach 10-12g / s (for P) or 10-11g / s (for S). At the same time, the response value of this detector for organic phosphorus and organic sulfur to the response value of carbon hydride can reach 104, so it can exclude a large number of solvent peaks and hydrocarbon interference, which is very beneficial to the analysis of trace phosphorus and sulfur, and is the main tool for detecting organophosphorus pesticides and sulfur-containing pollutants.

[0005] The current gas chromatograph uses FPD detector to measure the content of phosphorus and sulfur containing residual pesticide groups, the sample is burned in hydrogen flame, then the phosphorus flame or sulfur containing flame different spectrum is passed through different filters respectively, after passing through the focusing, the light intensity is reflected on the photomultiplier, but the filter device used by the existing FPD detector generally only has one filter, when detecting, when the detection item needs to be changed, the whole filter device needs to be changed, not only affects the detection efficiency, but also the whole filter device is difficult to replace. SUMMARY

[0006] 1. TECHNICAL PROBLEM TO BE SOLVED

[0007] In view of the problems in the prior art, the purpose of the present application is to provide a detector filter device capable of automatically switching filters, which can quickly switch two filters and perform surface self-cleaning during the switching process, ensuring the filtering effect, containing two filters, which can be switched as needed in one detector, reducing the cost while increasing the detection items of a single detector, overcoming the difficulty of no light leakage, and improving the utilization rate of the detector.

[0008] 2. TECHNICAL SCHEME

[0009] To solve the above problems, the present application adopts the following technical scheme.

[0010] The application discloses a detector filter device with automatically switchable filters, which comprises a filter shell, wherein the filter shell is a hollow structure, circular through holes are arranged on the upper and lower sides of the filter shell, a lens is arranged in the circular through hole on the lower side, an adjusting shaft is arranged at the center of the inside of the filter shell, bearings are arranged at the centers of the upper and lower sides of the filter shell, first filter structures and second filter structures are symmetrically arranged on the outer wall of the filter shell, the second filter structures are arranged corresponding to the circular through holes, limiting grooves are arranged on the side walls of the filter shell and matched with the first filter structures and the second filter structures, the end portions of the first filter structures and the second filter structures are clamped in the limiting grooves, the adjusting shaft is rotationally connected with the bearings, an installation cavity is arranged in the upper surface of the filter shell, a filter replacing mechanism for driving the adjusting shaft to rotate at a specific angle is arranged in the installation cavity, and two groups of filter wiping mechanisms are further arranged on the outer wall of the filter shell and staggered with the first filter structures and the second filter structures. When the filter device is used, the second filter structures are used to filter hydrogen flame, when the first filter structures need to be used for filtering, the adjusting shaft is controlled to rotate through the filter replacing mechanism, and the first filter structures and the second filter structures are driven to exchange positions, the first filter structures and the second filter structures are clamped in the limiting grooves, the stability of the first filter structures and the second filter structures can be effectively improved, and shaking can be avoided, in the rotating process, the surfaces of the first filter structures and the second filter structures are wiped through the arranged filter wiping mechanisms, dust adhesion is avoided, and the filtering effect is ensured. The scheme can realize quick switching of two filters, surface self-cleaning during the switching process, ensure the filtering effect, contain two filters, one detector can be switched according to needs, cost is reduced, the detection items of a single detector are increased, the difficulty of not leaking light is overcome, and the utilization rate of the detector is improved.

[0011] Further, the filter changing mechanism comprises a circular cavity opened at the center of the upper side of the filter housing, the inside of the filter housing is provided with a first rectangular cavity and a second rectangular cavity on both sides of the circular cavity, the first rectangular cavity and the second rectangular cavity are staggered with the first filter structure and the second filter structure, the first rectangular cavity and the second rectangular cavity are communicated with the circular cavity, the inner bottom of the first rectangular cavity and the second rectangular cavity is fixed with a compression spring, the compression spring in the first rectangular cavity is connected with a first direct current electromagnet, the compression spring in the second rectangular cavity is connected with a second direct current electromagnet, the side wall of the first direct current electromagnet and the second direct current electromagnet is connected with a sliding rod, and the sliding rod is slidingly connected with the filter housing, the magnetic field directions generated by the first direct current electromagnet and the second direct current electromagnet are opposite, the inside of the circular cavity is provided with a strip magnet concentrically arranged, and the strip magnet is fixedly connected with the top end of the adjusting shaft, the strip magnet is magnetically attracted to the magnetic field generated by the circular cavity, both ends of the strip magnet are hemispherical, the end of the core of the first rectangular cavity and the second rectangular cavity is provided with an arc-shaped groove matched with the end of the strip magnet, and both ends of the strip magnet are clamped in the arc-shaped grooves at both ends. In the initial state, the first direct current electromagnet and the second direct current electromagnet are both in the power-off state, at this time, the strip magnet is clamped in the arc-shaped grooves at both ends, and the strip magnet is magnetically attracted to the cores of the first direct current electromagnet and the second direct current electromagnet, so as to ensure that the adjusting shaft does not rotate, and the user can use the second filter structure for filtering, when it is needed to switch the first filter structure and the second filter structure, the first direct current electromagnet is controlled to be powered on to generate a magnetic field, which repels the strip magnet, because the position of the adjusting shaft is fixed, the first direct current electromagnet and the second direct current electromagnet move to both ends, the adjusting shaft continues to rotate under the repulsion until the rotation angle is greater than 180°, at this time, the strip magnet is magnetically attracted to the magnetic field generated by the first direct current electromagnet, and the adjusting shaft is adsorbed into the arc-shaped groove, completing the 180° rotation of the adjusting shaft, realizing the position exchange of the first filter structure and the second filter structure, when it is needed to continue to switch, the second direct current electromagnet is controlled to be powered on, at this time, because the strip magnet has completed 180° rotation, the magnetic field generated by the second direct current electromagnet repels the strip magnet, therefore, under the repulsion, the strip magnet continues to rotate by 180°, realizing the position exchange of the first filter structure and the second filter structure, only by controlling the first direct current electromagnet and the second direct current electromagnet to be powered on and powered off alternately, the position exchange of the first filter structure and the second filter structure can be realized, realizing the quick use switching of the first filter structure and the second filter structure.

[0012] Further, the two ends of the bar magnet are coated with a smooth coating, and the end of the arc-shaped groove is transitioned with a circular arc, which can effectively reduce the friction between the bar magnet and the arc-shaped groove, and avoid the bar magnet from being stuck in the arc-shaped groove and unable to rotate.

[0013] Further, the end of the bar magnet is provided with a plurality of second spherical grooves which are uniformly distributed, and the second spherical grooves are embedded with second balls, and the second balls are in abutment with the arc-shaped groove, which can further reduce the friction between the bar magnet and the arc-shaped groove, and facilitate the smooth rotation of the bar magnet.

[0014] Further, the filter wiping mechanism comprises a mounting shell fixed on the inner wall of the filter housing, the inner top of the mounting shell is fixed with a wiping liquid tank, the bottom end of the wiping liquid tank is connected with a water-absorbing sponge pad, a plurality of water-absorbing fibers are inserted into the wiping liquid tank, and the water-absorbing fibers extend to the inner bottom of the wiping liquid tank, the bottom end of the water-absorbing fibers is connected with the water-absorbing sponge pad, the inner front and rear ends of the mounting shell are connected with mounting plates, and the two mounting plates are rotatably connected with a rotating shaft, the outer wall of the rotating shaft is sleeved with a wiping cloth, the length of the wiping cloth matches the size of the first filter structure and the second filter structure, the bottom end height of the wiping cloth is less than the height of the upper surface of the first filter structure and the second filter structure, and the bottom end of the water-absorbing sponge pad is in abutment with the wiping cloth. Since the water-absorbing sponge pad and the water-absorbing sponge pad both have good water absorption effect, they can continuously absorb the alcohol in the wiping liquid tank, absorb the alcohol into the water-absorbing sponge pad, and wet the surface of the wiping cloth. During the rotation of the first filter structure and the second filter structure, since the height of the wiping cloth is less than the height of the upper surface of the first filter structure and the second filter structure, the wiping cloth can be in abutment with the surface of the first filter structure and the second filter structure, thereby wiping the surface of the first filter structure and the second filter structure, avoiding dust adhering to the surface of the first filter structure and the second filter structure, and ensuring the filtering effect of the first filter structure and the second filter structure.

[0015] Further, the inside of the wiping liquid tank is filled with wiping liquid, and the wiping liquid is a mixed solution of ethanol solution and diethyl ether solution with a volume ratio of 3:1, which can effectively improve the wiping effect on the surface of the first filter structure and the second filter structure.

[0016] Further, the outer wall of the rotating shaft is fixed with an annular inflatable air bag, the wiping cloth is fixed on the outer wall of the annular inflatable air bag, and the annular inflatable air bag is adjustable, the outer diameter of the wiping cloth can be adjusted by adjusting the inflation degree of the annular inflatable air bag, so that the wiping cloth can be conveniently attached to the surface of the first filter structure and the second filter structure, and the wiping effect on the surface of the first filter structure and the second filter structure is ensured.

[0017] Further, the second filter structure comprises a fixed ring and a heat conducting ring arranged concentrically, the filter is fixed in the heat conducting ring, a plurality of heat conducting cylinders arranged in a ring are fixed on the inner wall of the fixed ring, the stretch spring is fixed in the heat conducting cylinder, the heat shrinkable stretch rod is connected to the end of the stretch spring, and the other end of the heat shrinkable stretch rod is fixed on the outer wall of the heat conducting ring, and a plurality of heat shrinkable stretch rods are arranged in a ring. A plurality of uniformly distributed stretch springs and heat shrinkable stretch rods keep the heat conducting ring in a balanced state, and the filter is used for filtering light, when the flame is not at the center of the circular through hole, the temperature of the side of the second filter structure close to the flame is higher, the contraction length of the heat shrinkable stretch rod on the same side is larger, so that the heat conducting ring is pulled to the same side, and the filter adjusts the position according to the temperature of the flame, so as to ensure the filtering effect of the filter.

[0018] Further, a plurality of first spherical grooves are arranged on the side wall of the limiting groove in contact with the first filter structure, the first spherical groove is embedded with the first ball, and the first ball is in close contact with the outer surface of the first filter structure and the second filter structure. The first spherical groove can better limit the first filter structure and the second filter structure, avoid the position deviation of the first filter structure and the second filter structure, and ensure the detection accuracy.

[0019] 3. Beneficial effects

[0020] Compared with the prior art, the advantages of the present application are:

[0021] (1) The scheme can realize quick switching of two filters, surface self-cleaning during switching, guarantee of filtering effect, containing two filters, switching according to needs in one detector, reduction of cost, increase of detection items of a single detector, overcoming of the difficulty of no light leakage, and improvement of the utilization rate of the detector.

[0022] (2) In the initial state, the first and second DC electromagnets are in the power-off state, at this time the bar magnet is clamped in the arc-shaped groove at both ends, and the bar magnet is magnetically attracted to the cores of the first and second DC electromagnets, ensuring that the adjusting shaft does not rotate, and the user can use the second filter structure to filter light. When it is necessary to switch the first and second filter structures, the first DC electromagnet is controlled to be powered on to generate a magnetic field, which repels the bar magnet. Since the position of the adjusting shaft does not move, the first and second DC electromagnets move to both ends, and the adjusting shaft continues to rotate under the repulsive force until the rotation angle is greater than 180°. At this time, the bar magnet is magnetically attracted to the magnetic field generated by the first DC electromagnet, and the adjusting shaft is attracted to the arc-shaped groove, completing the 180° rotation of the adjusting shaft and realizing the position exchange of the first and second filter structures. When it is necessary to continue switching, the second DC electromagnet is controlled to be powered on. At this time, since the bar magnet has completed 180° rotation, the magnetic field generated by the second DC electromagnet repels the bar magnet. Therefore, under the repulsive force, the bar magnet continues to rotate by 180°, realizing the position exchange of the first and second filter structures. Only by controlling the first and second DC electromagnets to be powered on and off alternately can the position exchange of the first and second filter structures be realized, and the quick use switching of the first and second filter structures can be realized.

[0023] (3) The outer walls of both ends of the bar magnet are coated with a smooth coating, and the end of the arc-shaped groove is transitioned with a circular arc, which can effectively reduce the friction between the bar magnet and the arc-shaped groove, and avoid the phenomenon that the bar magnet is clamped in the arc-shaped groove and cannot rotate.

[0024] (4) The end of the bar magnet is provided with a plurality of second spherical grooves uniformly distributed, and the second spherical grooves are embedded with second balls, and the second balls abut against the arc-shaped groove, which can further reduce the friction between the bar magnet and the arc-shaped groove, and facilitate smooth rotation of the bar magnet.

[0025] (5) Since the water-absorbing sponge pad and the water-absorbing sponge pad have good water-absorbing effect, they can continuously absorb alcohol in the wiping liquid tank, absorb alcohol into the water-absorbing sponge pad, and wet the surface of the wiping cloth. During the rotation of the first and second filter structures, since the height of the wiping cloth is less than the height of the upper surface of the first and second filter structures, the wiping cloth can be attached to the surface of the first and second filter structures, so as to wipe the surface of the first and second filter structures, avoid dust adhering to the surface of the first and second filter structures, and ensure the filtering effect of the first and second filter structures.

[0026] (6) The wiping solution is a mixture of ethanol solution and ether solution in a volume ratio of 3:1, which can effectively improve the wiping effect on the surfaces of the first filter structure and the second filter structure.

[0027] (7) An adjustable annular inflatable airbag is provided. The outer diameter of the wiping cloth can be adjusted by adjusting the expansion degree of the annular inflatable airbag, so that the wiping cloth can be easily attached to the surface of the first filter structure and the second filter structure, ensuring the wiping effect on the surface of the first filter structure and the second filter structure.

[0028] (8) Multiple evenly distributed tension springs and heat shrink tension rods keep the heat conduction ring in a balanced state and use the filter to filter light. When the flame is not in the center of the circular through hole, the temperature of the side of the second filter structure closer to the flame is higher, and the shrinkage length of the heat shrink tension rod on the same side is greater. Therefore, the heat conduction ring will be pulled to the same side, so that the filter can be finely adjusted according to the flame temperature, thereby ensuring the filtering effect of the filter.

[0029] (9) The first spherical groove can better limit the position of the first filter structure and the second filter structure, avoid the position of the first filter structure and the second filter structure from shifting, and ensure detection accuracy. Attached Figure Description

[0030] Figure 1 This is a front view of the present invention;

[0031] Figure 2 for Figure 1 Enlarged structural diagram at point A;

[0032] Figure 3 This is a top view of the internal structure of the filter housing in this invention;

[0033] Figure 4 This is a top view of the filter replacement mechanism in this invention;

[0034] Figure 5 for Figure 4 Enlarged structural diagram at point B;

[0035] Figure 6 for Figure 5 Enlarged structural diagram at point C;

[0036] Figure 7 This is a schematic diagram of the filter wiping mechanism in this invention;

[0037] Figure 8 This is a schematic diagram of the structure of the second filter in this invention;

[0038] Figure 9 for Figure 8 A magnified structural diagram at point D.

[0039] Explanation of reference numerals in the drawings:

[0040] 1 filter housing, 2 circular through hole, 3 adjusting shaft, 4 bearing, 5 limiting groove, 501 first spherical groove, 502 first ball, 6 first filter structure, 7 second filter structure, 701 fixed ring, 702 heat conduction ring, 703 filter, 704 heat conduction cylinder, 705 tension spring, 706 heat shrinkage tension rod, 8 filter replacement mechanism, 801 circular cavity, 802 first rectangular cavity, 803 second rectangular cavity, 804 compression spring, 805 first direct current electromagnet, 806 second direct current electromagnet, 807 bar magnet, 808 arc-shaped groove, 809 sliding rod, 810 second spherical groove, 811 second ball, 9 filter wiping mechanism, 901 mounting shell, 902 wiping liquid tank, 903 water-absorbing sponge pad, 904 water-absorbing fiber, 905 mounting plate, 906 rotating shaft, 907 annular inflatable air bag, 908 wiping cloth. DETAILED DESCRIPTION

[0041] In the following, the technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0042] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom end" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0043] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "sleeved / connected", "connected" and the like should be understood broadly, for example, "connected" can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be internal communication of two elements. For a person of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0044] Example 1:

[0045] Please refer toFigure 1 and Figure 3 The application discloses an automatic filter switching detector filter device which comprises a filter shell 1, the filter shell 1 is a hollow structure, circular through holes 2 are arranged on the upper and lower sides of the filter shell 1, a lens is arranged in the lower circular through hole 2, an adjusting rotating shaft 3 is arranged at the center of the inside of the filter shell 1, bearings 4 are arranged at the centers of the upper and lower sides of the filter shell 1, first filter structures 6 and second filter structures 7 are symmetrically arranged on the outer wall of the filter shell 1, the second filter structures 7 are arranged corresponding to the circular through holes 2, limiting grooves 5 are arranged on the side walls of the filter shell 1 and matched with the first filter structures 6 and the second filter structures 7, the end portions of the first filter structures 6 and the second filter structures 7 are clamped in the limiting grooves 5, the adjusting rotating shaft 3 is rotationally connected with the bearings 4, an installation cavity is arranged in the upper surface of the filter shell 1, a filter replacement mechanism 8 is arranged in the installation cavity and used for driving the adjusting rotating shaft 3 to rotate at a specific angle, and two groups of filter wiping mechanisms 9 are further arranged on the outer wall of the filter shell 1 and staggered with the first filter structures 6 and the second filter structures 7. When the filter device is used, the second filter structures 7 are used for filtering hydrogen flame, when the first filter structures 6 are needed to be used for filtering, the adjusting rotating shaft 3 is controlled to rotate by the filter replacement mechanism 8, the first filter structures 6 and the second filter structures 7 are driven to exchange positions, the first filter structures 6 and the second filter structures 7 are clamped in the limiting grooves 5, the stability of the first filter structures 6 and the second filter structures 7 can be effectively improved, and shaking can be avoided, in the rotating process, the filter wiping mechanisms 9 are arranged and used for wiping the surfaces of the first filter structures 6 and the second filter structures 7, dust adhesion can be avoided, and the filtering effect can be ensured. The scheme can realize quick switching of two filters, surface self-cleaning in the switching process, ensure the filtering effect, contain two filters, a detector can be switched according to needs, cost is reduced, the detection items of a single detector are increased, the difficulty of not leaking light is overcome, and the utilization rate of the detector is improved.

[0046] Please refer to Figure 1 and Figures 4-5The filter changing mechanism 8 comprises a circular cavity 801 formed at the center of the upper side of the filter housing 1, first and second rectangular cavities 802 and 803 formed respectively at the two sides of the interior of the filter housing 1, the first and second rectangular cavities 802 and 803 being staggered with the first and second filter structures 6 and 7, the first and second rectangular cavities 802 and 803 being communicated with the circular cavity 801, the inner bottom of each of the first and second rectangular cavities 802 and 803 being fixed with a compression spring 804, the compression spring 804 in the first rectangular cavity 802 being connected with a first direct-current electromagnet 805, the compression spring 804 in the second rectangular cavity 803 being connected with a second direct-current electromagnet 806, the side wall of each of the first and second direct-current electromagnets 805 and 806 being connected with a sliding rod 809, the sliding rod 809 being slidingly connected with the filter housing 1, the magnetic field directions generated by the first and second direct-current electromagnets 805 and 806 being opposite, the interior of the circular cavity 801 being provided with a strip-shaped magnet 807 concentrically arranged therewith, the strip-shaped magnet 807 being fixedly connected with the top end of the adjusting shaft 3, the strip-shaped magnet 807 being magnetically attracted to the magnetic field generated by the circular cavity 801, the two ends of the strip-shaped magnet 807 being semispherical, the end portions of the cores of the first and second rectangular cavities 802 and 803 being formed with arc-shaped grooves 808 matched with the end portions of the strip-shaped magnet 807, and the two ends of the strip-shaped magnet 807 being clamped in the arc-shaped grooves 808 at the two ends.In the initial state, the first and second DC electromagnets 805 and 806 are both in the power-off state, at this time the bar magnet 807 is clamped inside the arc-shaped grooves 808 at both ends, and the bar magnet 807 is magnetically attracted to the cores of the first and second DC electromagnets 805 and 806, ensuring that the adjusting shaft 3 does not rotate, and the user can use the second filter structure 7 to filter light, when it is necessary to switch the first and second filter structures 6 and 7, the first DC electromagnet 805 is controlled to be powered on to generate a magnetic field, which repels the bar magnet 807, and because the position of the adjusting shaft 3 is fixed, the first and second DC electromagnets 805 and 806 move to both ends, and the adjusting shaft 3 continues to rotate under the repulsion until the rotation angle is greater than 90180°, at this time the bar magnet 807 is magnetically attracted to the magnetic field generated by the first DC electromagnet 805, and the adjusting shaft 3 is adsorbed into the arc-shaped grooves 808, completing the 180° rotation of the adjusting shaft 3, and realizing the position exchange of the first and second filter structures 6 and 7, when it is necessary to continue to switch, the second DC electromagnet 806 is controlled to be powered on, at this time because the bar magnet 807 has completed 180° rotation, the magnetic field generated by the second DC electromagnet 806 repels the bar magnet 807, so under the repulsion, the bar magnet 807 continues to rotate by 180°, realizing the position exchange of the first and second filter structures 6 and 7, and only by controlling the first and second DC electromagnets 805 and 806 to be powered on and off alternately, the position exchange of the first and second filter structures 6 and 7 can be realized, and the quick use switching of the first and second filter structures 6 and 7 can be realized.

[0047] Please refer to Figures 4-5 The outer walls at both ends of the bar magnet 807 are coated with a smooth coating, and the end portions of the arc-shaped grooves 808 adopt a circular arc transition, which can effectively reduce the friction between the bar magnet 807 and the arc-shaped grooves 808, and avoid the phenomenon that the bar magnet 807 is clamped in the arc-shaped grooves 808 and cannot rotate.

[0048] Please refer to Figures 4-6 The end portions of the bar magnet 807 are provided with a plurality of second spherical grooves 810 which are uniformly distributed, and the second spherical grooves 810 are embedded with second balls 811, and the second balls 811 abut against the arc-shaped grooves 808, which can further reduce the friction between the bar magnet 807 and the arc-shaped grooves 808, and facilitate smooth rotation of the bar magnet 807,

[0049] Please refer to Figure 3 and Figure 7The filter wiping mechanism 9 comprises a mounting shell 901 fixed on the inner wall of the filter shell 1, the inner top of the mounting shell 901 is fixed with a wiping liquid tank 902, the bottom end of the wiping liquid tank 902 is connected with a water-absorbing sponge pad 903, a plurality of water-absorbing fibers 904 are inserted into the wiping liquid tank 902, and the water-absorbing fibers 904 extend to the inner bottom of the wiping liquid tank 902, the bottom end of the water-absorbing fibers 904 is connected with the water-absorbing sponge pad 903, the inner front and rear ends of the mounting shell 901 are both connected with mounting plates 905, the rotating shaft 906 is rotatably connected between the two mounting plates 905, the wiping cloth 908 is sleeved on the outer wall of the rotating shaft 906, the length of the wiping cloth 908 matches the size of the first filter structure 6 and the second filter structure 7, the bottom end height of the wiping cloth 908 is less than the height of the upper surface of the first filter structure 6 and the second filter structure 7, and the bottom end of the water-absorbing sponge pad 903 is attached to the wiping cloth 908. Since the water-absorbing sponge pad 903 and the water-absorbing sponge pad 903 both have good water absorption effect, the alcohol in the wiping liquid tank 902 can be continuously absorbed, the alcohol is absorbed into the water-absorbing sponge pad 903, and the surface of the wiping cloth 908 is wetted. In the rotating process of the first filter structure 6 and the second filter structure 7, since the height of the wiping cloth 908 is less than the height of the upper surface of the first filter structure 6 and the second filter structure 7, the wiping cloth 908 can be attached to the surface of the first filter structure 6 and the second filter structure 7, so as to wipe the surface of the first filter structure 6 and the second filter structure 7, avoid dust adhering to the surface of the first filter structure 6 and the second filter structure 7, and ensure the filtering effect of the first filter structure 6 and the second filter structure 7.

[0050] Please refer to Figure 7 The inside of the wiping liquid tank 902 is filled with wiping liquid, the wiping liquid is a mixed solution of an ethanol solution and an ether solution in a volume ratio of 3:1, and the wiping effect on the surface of the first filter structure 6 and the second filter structure 7 can be effectively improved.

[0051] The outer wall of the rotating shaft 906 is fixed with an annular inflatable air bag 907, the wiping cloth 908 is fixed on the outer wall of the annular inflatable air bag 907, the annular inflatable air bag 907 is adjustable, the outer diameter of the wiping cloth 908 can be adjusted by adjusting the inflation degree of the annular inflatable air bag 907, so that the wiping cloth 908 can be tightly attached to the surface of the first filter structure 6 and the second filter structure 7, and the wiping effect on the surface of the first filter structure 6 and the second filter structure 7 is ensured.

[0052] Please refer to Figure 3 and Figures 8-9The second filter structure 7 comprises a fixed circular ring 701 and a heat conducting ring 702 arranged concentrically, the heat conducting ring 702 is internally fixed with a filter 703, the inner circle wall of the fixed circular ring 701 is fixed with a plurality of heat conducting cylinders 704 arranged in a ring shape, the heat conducting cylinder 704 is internally fixed with a tension spring 705, the end of the tension spring 705 is connected with a heat shrinkage stretching rod 706, and the other end of the heat shrinkage stretching rod 706 is fixed on the outer wall of the heat conducting ring 702, a plurality of heat shrinkage stretching rods 706 are arranged in a ring shape, the first filter structure 6 and the second filter structure 7 are the same in structure, but the filter 703 inside is replaced with other different filters required. The plurality of uniformly distributed tension springs 705 and heat shrinkage stretching rods 706 make the heat conducting ring 702 in a balanced state, and the filter 703 is used for filtering, when the flame is not at the center inside the circular through hole 2, the side of the second filter structure 7 close to the flame is relatively high in temperature, the contraction length of the heat shrinkage stretching rod 706 on the same side is larger, so that the heat conducting ring 702 is pulled to the same side, so that the filter 703 is adjusted in position according to the flame temperature, thereby ensuring the filtering effect of the filter 703.

[0053] Please refer to Figures 1-2 The side wall of the limiting groove 5 in contact with the first filter structure 6 is provided with a plurality of first spherical grooves 501, the first spherical grooves 501 are internally embedded with first balls 502, and the first balls 502 are attached to the outer surfaces of the first filter structure 6 and the second filter structure 7. The first spherical grooves 501 are arranged to better limit the first filter structure 6 and the second filter structure 7, avoid the position of the first filter structure 6 and the second filter structure 7 from being deviated, and ensure the detection accuracy.

[0054] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the improved concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. An automatic switchable filter detector light filtering device, comprising a light filtering shell (1), the light filtering shell (1) is a hollow structure, a circular through hole (2) is arranged on the upper and lower sides of the light filtering shell (1) respectively, and a lens is installed in the circular through hole (2) on the lower side, characterized in that: The inside center of the filter shell (1) is provided with a vertically arranged adjusting rotating shaft (3), the upper and lower center of the filter shell (1) is fixed with a bearing (4), the outer wall of the filter shell (1) is fixed with symmetrically arranged first filter structure (6) and second filter structure (7), and the second filter structure (7) is arranged corresponding to the circular through hole (2), the two side walls of the filter shell (1) are provided with limiting grooves (5) matched with the first filter structure (6) and the second filter structure (7), and the end of the first filter structure (6) and the second filter structure (7) is clamped in the limiting groove (5), the adjusting rotating shaft (3) is rotatably connected with the bearing (4), the upper surface of the filter shell (1) is provided with an installation cavity, and the installation cavity is provided with a filter replacement mechanism (8) for driving the adjusting rotating shaft (3) to rotate, the outer wall of the filter shell (1) is further provided with two filter wiping mechanisms (9), and the two filter wiping mechanisms (9) are staggered with the first filter structure (6) and the second filter structure (7); The filter replacement mechanism (8) comprises a circular cavity (801) formed in the upper center of the filter shell (1), first and second rectangular cavities (802) and (803) are formed in the inside of the filter shell (1) on both sides of the circular cavity (801), the first and second rectangular cavities (802) and (803) are staggered with the first filter structure (6) and the second filter structure (7), the first and second rectangular cavities (802) and (803) are in communication with the circular cavity (801), the inner bottom of the first and second rectangular cavities (802) and (803) is fixed with a compression spring (804), the compression spring (804) in the first rectangular cavity (802) is connected with a first direct current electromagnet (805), the compression spring (804) in the second rectangular cavity (803) is connected with a second direct current electromagnet (806), the side wall of the first and second direct current electromagnets (805) and (806) is connected with a sliding rod (809), and the sliding rod (809) is slidably connected with the filter shell (1), the magnetic field directions generated by the first and second direct current electromagnets (805) and (806) are opposite, the inside of the circular cavity (801) is provided with a strip-shaped magnet (807) arranged concentrically, and the top end of the strip-shaped magnet (807) is fixedly connected with the adjusting rotating shaft (3), the strip-shaped magnet (807) is magnetically attracted to the magnetic field generated in the circular cavity (801), the two ends of the strip-shaped magnet (807) are semispherical, the end of the iron core of the first and second rectangular cavities (802) and (803) is provided with an arc-shaped groove (808) matched with the end of the strip-shaped magnet (807), and the two ends of the strip-shaped magnet (807) are clamped in the arc-shaped grooves (808) at both ends. The end of the bar magnet (807) is provided with a plurality of second spherical grooves (810) uniformly distributed, the second spherical grooves (810) are embedded with second balls (811) inside, and the second balls (811) abut against the arc-shaped groove (808).

2. A detector filter arrangement with automatic switchable filter according to claim 1, characterized in that Smooth coating is applied on the outer wall of the two ends of the bar magnet (807), and the end of the arc-shaped groove (808) is transitioned by a circular arc.

3. A detector filter arrangement with automatic switchable filter according to claim 1, characterized in that The filter wiping mechanism (9) comprises a mounting shell (901) fixed on the inner wall of the filter shell (1), the inner top of the mounting shell (901) is fixed with a wiping liquid tank (902), the bottom end of the wiping liquid tank (902) is connected with a water-absorbing sponge pad (903), a plurality of water-absorbing fibers (904) are inserted into the wiping liquid tank (902), and the water-absorbing fibers (904) extend to the inner bottom of the wiping liquid tank (902), the bottom end of the water-absorbing fibers (904) is connected with the water-absorbing sponge pad (903), the inner front and back ends of the mounting shell (901) are both connected with mounting plates (905), the two mounting plates (905) are rotatably connected with a rotating shaft (906), the outer wall of the rotating shaft (906) is sleeved with a wiping cloth (908), the length of the wiping cloth (908) matches the size of the first filter structure (6) and the second filter structure (7), the bottom end height of the wiping cloth (908) is less than the height of the upper surface of the first filter structure (6) and the second filter structure (7), and the bottom end of the water-absorbing sponge pad (903) is attached to the wiping cloth (908).

4. A detector filter arrangement with automatic switchable filter according to claim 3, characterized in that The wiping liquid tank (902) is filled with wiping liquid, and the wiping liquid is a mixed solution of an ethanol solution and an ether solution in a volume ratio of 3:

1.

5. A detector filter arrangement with automatic switchable filter according to claim 4, characterized in that The outer wall of the rotating shaft (906) is fixed with an annular inflatable air bag (907), and the wiping cloth (908) is fixed on the outer wall of the annular inflatable air bag (907).

6. A detector filter arrangement with automatic switchable filter according to claim 1, characterized in that The second filter structure (7) comprises a fixed ring (701) and a heat-conducting ring (702) arranged concentrically, the heat-conducting ring (702) is fixed with a filter (703) inside, a plurality of heat-conducting cylinders (704) are fixed on the inner wall of the fixed ring (701) in an annular distribution, the heat-conducting cylinders (704) are fixed with stretch springs (705) inside, the ends of the stretch springs (705) are connected with heat-shrinkable stretch rods (706), the other ends of the heat-shrinkable stretch rods (706) are fixed on the outer wall of the heat-conducting ring (702), and the heat-shrinkable stretch rods (706) are arranged in an annular arrangement.

7. The detector filter arrangement of claim 1, wherein: A plurality of first spherical grooves (501) are formed in the side wall of the limiting groove (5) in contact with the first filter structure (6), the first spherical grooves (501) are embedded with first balls (502) inside, and the first balls (502) are attached to the outer surfaces of the first filter structure (6) and the second filter structure (7).

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