baber/WOPTO huggingface dataset:
Patent FI-103201-B1 (FI)
Inventor: ADDOR ROGER WILLIAMS
IPC: C07D405/04
Filed: 1991-05-10
Granted: 1999-05-14
Abstract: This invention provides new N-acylated arylpyrroles of formula (I)   <CHEM> effective for the control of insects, acarids, nematodes, fungi and mollusks and useful for the protection of growing plants from the destructive actions of said pests. The invention also provides pesticidal compositions containing the new N-acylated arylpyrroles and methods for the preparation of thereof.
Patent FI-103321-B1 (FI)
Title: Method for destroying a large number of hairs growing in hair follicles in an area of the human skin
Inventor: TANKOVICH NIKOLAI I
IPC: A61B18/20
Filed: 1995-01-03
Granted: 1999-06-15
Abstract: The process applies to the hairs and skin section a contaminant which has a large number of small particles with a high absorption at the frequency of light. The application is performed so that some of the contaminant infiltrates into the hair ducts. The skin section is illuminated with several short pulses of light. The first of the pulses (30) has sufficient energy to cause a large number of the particle to explode into two or more fragments, which spreads the contaminant into the hair ducts. Subsequent pulses have enough energy to cause a large number of fragments to explode into fragments which again spreads the contaminant into the ducts. The explosion and the transfer of energy to and from the particles and the fragments causes damage to the skin tissue (26) surrounding the ducts to cause the hair (28) growing in the ducts to die.
Patent IE-49810-B1 (IE)
Title: Process for the manufacture of 5-mercapto-1,2,3-triazoles
IPC: C07D285/06
Filed: 1980-05-20
Abstract: A process for making 5-mercapto-1,2,3-triazoles of the formula  I wherein R1 is hydrogen or a C1-C4-alkyl which may also be substituted, the said process comprising (1) as a first step reacting a solution of 1,2,3-thiadiazole-5-carbohydroxamic acid derivative of the formula  II wherein R1 has the meaning as above and R2 is hydrogen or a univalent metal equivalent in an inert organic solvent in the presence of an acid acceptor with a solution in an inert organic solvent of an acid halide of the formula R3-X so as to form an acylated 1,2,3-thiadiazole-5-carbohydroxamic acid derivative (2) reacting as a solution in an inert organic solvent the carbohydroxamic acid derivative just obtained with an alcohol or phenol of the formula H-O-R4 so as to form a (1,2,3-thiadiazole-5-yl)-carbamic acid ester (3) then treating the thus obtained carbamic acid ester with an acetic or basic catalyst to form the 5-amino-1,2,3-thiadiazole (4) whereupon the said amino thiadiazole is subject to a rearrangement in the presence of a base followed by isolation of the product of the reaction.
Patent IE-65767-B1 (IE)
Title: Non-human carbonyl hydrolase mutants DNA sequences and vectors encoding same and hosts transformed with said vectors
Inventor: BOTT RICHARD RAY
IPC: C12N9/54
Filed: 1987-04-28
Abstract: Novel carbonyl hydrolase mutants derived from the amino acid sequence of naturally-occurring or recombinant non-human carbonyl hydrolases and DNA sequences encoding the same. The mutant carbonyl hydrolases, in general, are obtained by in vitro modification of a precursor DNA sequence encoding the naturally-occurring or recombinant carbonyl hydrolase to encode the substitution, insertion or deletion of one or more amino acids in the amino acid sequence of a precursor carbonyl hydrolase. Such mutants have one or more properties which are different than the same property of the precursor hydrolase.
Patent IE-62582-B1 (IE)
Title: Nitrogen-containing cyclic ligands, metallic complexes formed by these ligands, diagnostic compositions containing these complexes and process for the preparation of the ligands
Inventor: SCHAEFER MICHEL
IPC: C07F15/02
Filed: 1988-04-13
Abstract: Ligands and complexes of the title and the applications of these complexes in magnetic resonance imaging, in X-ray radiology and as in-vivo chemical shift agents.
Patent IE-35377-B1 (IE)
Title: Improvements in or relating to pyrazole derivatives
IPC: C07D405/04
Filed: 1970-09-10
Abstract: 1307005 Derivatives of pyrazole-4-acetic acid BYK GULDEN LOMBERG CHEMISCHE FABRIK GmbH 9 Sept 1970 [12 Sept 1969] 43147/70 Heading C2C The invention comprises compounds of formula and their salts with pharmacologically compatible bases, wherein R<SP>1</SP>, R<SP>2</SP>, R<SP>3</SP> are each H, an (up to C 7 ) aliphatic or cycloaliphatic hydrocarbon radical, or an (up to C 12 ) optionally substituted (otherwise than by NO 2 ) aryl or heteroaryl group, or R<SP>1</SP> is benzyl (optionally halogen- or C 1-4 alkoxy-substituted), provided that when R 2 is H, R 3 may not be H or Me; R<SP>4</SP> is H, C 1-3 alkyl or C 3-6 cycloalkyl; and A is,CO 2 H, CO 2 R<SP>5</SP>, CONR<SP>6</SP>R<SP>7</SP>, CN or C(:NOH)OH, where R<SP>5</SP> is C 1-4 alkyl, benzyl, Ph or 2-HO 2 CC 6 H 4 , and R<SP>6</SP>, R<SP>7</SP> are each H or C 1-4 alkyl, or NR<SP>6</SP>R<SP>7</SP> is pyrrolidino, piperidino or morpholino. The following preparative methods are exemplified: (1) reacting R<SP>2</SP>CMe NNHR<SP>1</SP> with reaction product and hydrolysing the compound thus formed (or alternatively first forming from the initial product the N,N.dimethyl-4-pyrazolyl. methyleneiminium perchlorate, and hydrolysing this) to give the corresponding 4-formylpyrazole, reducing the latter to the 4-hydroxymethylpyrazole, converting this via the 4-chloromethylpyrazole to the 4-cyanomethyl compound and optionally hydrolysing this to the acid; (2) reacting the diketo ester with R<SP>1</SP>NHNH 2 ; (3) reacting an alkyl-3-acyl-4- dialkylamino - 3 - butenoate with R<SP>1</SP>NHNH 2 ; (4) interconversion of acids, esters, nitriles, and amides, by known methods; (5) reacting the corresponding acid chloride with HNR<SP>6</SP>R<SP>7</SP> or with NH 2 OH; (6) reacting a compound where R<SP>1</SP> =Na, with R<SP>1</SP>-halide (R<SP>1</SP>#H), (7:) hydrolysing (e.g.) 3,5 - dimethyl - 1 - phenyl - 4 - pyrazolethioacetmorpholide to the corresponding acid; (8) hydrolysing (e.g.) ethyl 3,5-dimethyl-1- phenyl - 4 - pyrazoleacetimidate to the corresponding acetate. Therapeutic compositions for oral, parenteral or rectal administration comprise compounds of the above formula, which have antiphlogistic, analgesic and antipyretic properties.
[GB1307005A]
Patent IE-57032-B1 (IE)
Title: Sputtered semiconducting films of catenated phosphorus material and devices formed therefrom
IPC: H01L51/05
Filed: 1984-06-28
Abstract: A process for the production of a semiconducting catenated phosphorus film characterised in that it comprises sputtering a thin film thereof onto a substrate is disclosed. …The present process may be applied to the production of semiconductor devices. Referring to the accompanying illustrative drawing, a sputtered film 22 may be used in a sandwich configuration on a glass substrate 24 with a metallic lock contact 26 and metal dot top contacts 28. …For example, amorphous and polycrystalline films of KP15 may be formed by RF diode sputtering targets of KP15 and excess phosphorus in an argon phase. Substrate temperatures up to 280-300 DEG C provide amorphous films. Higher temperatures provide microcrystalline or polycristalline films. These films have high resistance and may be used as the insulator in MIS devices employing III-V semiconductors. Co-sputtering with nickel increases the conductivity of the films from approximately 10<-><1><0> (ohm-cm)<-><1> to 10<-><2> (ohm-cm)<-><1>; only reduces the optical gap by 0.2 eV; and reduces the activation energy from 0.8 eV to 0.2 eV; the nickel content varying from 5-15%. Substrates include glass, silicon, tantalum, stainless steel, gallium phosphide and gallium arsenide, and glass metallized with metals, such as titanium, nickel and aluminium. Double diode electrical characteristics have been observed in devices formed on metallized glass substrates having co-sputterred thereon thin film polyphosphides and nickel with nickel and titanium top contacts. …The present invention represents an advance over the prior art.
Patent IE-40290-B1 (IE)
Title: Wew aminopyrrole derivatives
IPC: C07D207/36
Filed: 1974-08-08
Abstract: 1427945 Derivatives of 3-aminopyrrole GRUPPO LEPETIT SpA 25 July 1974 [22 Aug 1973] 39790/73 Heading C2C The invention comprises compounds of formula and their salts with pharmaceutically acceptable acids, wherein R is hydrogen, (C 1-4 )alkyl, benzyl or halo-substituted benzyl; R 1 is hydrogen, (C 1-4 )alkyl, phenyl or phenyl carrying one to three substituents chosen from (C 1-4 )alkyl, (C 1-4 )alkoxy, benzyloxy, fluoro, chloro, bromo, hydroxy and nitro; R 2 is hydrogen, (C 1-4 )alkyl, formyl, (C 2-4 )aliphatic acyl, benzoyl, carbo- (C 1-4 )alkoxy -(C 2-4 )aliphatic acyl, carbamyl, phenylcarbamyl, thiocarbamyl, phenylthiocarbamyl, benzoylthiocarbamyl, carboxyphenyl, benzenesulphonyl, (C 1-4 )alkylsulphonyl, toluenesulphonyl or phenacylsulphonyl; R 3 is hydrogen or (C 1-4 )alkyl or R 2 and R 3 together are (C 2-4 )alkylidene, benzylidene or halo-substituted benzylidene; R 4 is (C 2-4 )- aliphatic acyl, benzoyl, benzoyl carrying one to three substituents chosen from fluoro, chloro, bromo and (C 1-4 )alkoxy, carbo(C 1-4 )alkoxy, carboxy, carbamyl, methylcarbamyl or phenylcarbamyl and R 5 is hydrogen, (C 1-4 )alkyl, carbo(C 1-4 )alkoxy, carbo (C 1-4 )alkoxy-methyl, trifluoromethyl, carboxy, carbamyl or carbazoyl or R 4 and R 5 together are -CO-(CH 2 ) n -, wherein the carbonyl group is connected to the carbon atom of the pyrrole ring which bears the substituent R 4 and n is 2, 3 or 4, provided that when R 1 =R 5 =Me and R=H, then one of R 2 , R 3 #H and R 4 #CO 2 Et. These compounds are prepared (when R=R 2 =R 3 =H) by reacting RNH-CHR 1 -CN with either R 2 COCH 2 R 4 or R 5 C # CR 4 and cyclizing the thus formed inter-- mediate of formula the products may then be reacted further if desired to convert the 3-NH 2 groups or other functional groups present to different substituent groups and/or replace the 1-H atom by R(#H). Therapeutic compositions having anti-inflammatory antipyretic and analgesic activity, C.N.S. depressant activity, and in some cases sedative and myorelaxing activity, comprise compounds of the above formula, and may be administered orally, parenterally or rectally.
[GB1427945A]
Patent IE-38397-B1 (IE)
Title: Method for the production of cellulose-based fibres and polynosic fibres having a high resistance to combustion and fibres and textile articles obtained thereby
IPC: D01F2/08
Filed: 1973-10-22
Abstract: A method is disclosed for producing cellulosic and/or polynosic fibres having flame-resisting properties, the improvement consisting in the fact that a composite viscose is spun in an acidic bath, said composite viscose being obtained by the association in an aqueous solvent, of cellulose xanthate with a phosphorus and nitrogen compound, dissolved in the same aqueous solvent and capable of being converted, while cellulose is being regenerated in said acidic bath, into a state of substantial insolubility. The phosphorus and nitrogen compound is a compound obtained by reacting a phosphonium derivative with aminoacids and amines and/or ammonia. A preferred compound is tetrakis-hydroxymethylphosphonium chloride. By so doing, an efficient flame-retarding protection is obtained for the fibre without sacrificing the physical properties thereof. Critical quantities, reaction conditions and test results are reported.
[US3947276A]
Patent IE-53714-B1 (IE)
Title: Control of industrial spoilage with nitroimidazole compounds
IPC: C10M133/46
Filed: 1982-08-19
Abstract: Dimetridazole, metronidazole, secnidazole and ipronidazole are used to combat industrial spoilage of liquid organic materials containing water or aqueous liquids containing organic materials caused by obligate anaerobic sulphate-reducing bacteria.
Patent IE-59984-B1 (IE)
Title: Method of detecting or estimating biological material
IPC: G01N33/564
Filed: 1987-07-28
Abstract: Monoclonal antibodies raised against cell walls of Group A Streptococci are specific to biological materials, e.g. immunoglobulins, having terminal N-acetyl glucosamine residues and can be used in their detection, e.g. in the diagnosis of diseases characterized by their presence, e.g. rheumatoid arthritis and Crohn's disease.
Patent IE-63812-B1 (IE)
Title: Process for the manufacture of coatings by crosslinking new radiocrosslinkable compositions and new carbonates
Inventor: BROSSE JEAN-CLAUDE
IPC: B05D7/24
Filed: 1990-06-18
Abstract: The invention relates to a coatings manufacturing process by radiation crosslinking. is firstly directs radiocrosslinkable composition (C) by mixing at least a (meth) acrylic acid (A) with a reactive diluent system comprising at least one mono carbonate (meth) acrylate (B) having the general formula (I): in which : . R₁ represents H or CH₃ . R₂ represents an alkylene ether or alkylene chain having a total number of carbon atoms between 2 and 6, . not represents an integer between 1 and 6.
then applying the composition (C) on a support and then radioréticule, preferably by UV radiation.
The invention also relates to the radioréticulables compositions (C) in which the compound (A) and the carbonate (B) are not simultaneously 2-methacryloyloxy ethyl carbonate carbonyldioxy-2,3 propyl, and the carbonates of the formula general (I) wherein R₂ represents (CH₂)m and wherein m and not are integers such that 2 ≦ m ≦ 6, 1 ≦ n ≦ 6 and n ≠ 1 when m = 2 and R₁ represents CH₃. carbonates of general formula (I) are very sensitive, allowing irradiation time very significantly lower than those hitherto practiced with diluents mono (meth) acrylic, or alternatively of photocrosslinking without photo- initiator.
Patent IE-66155-B1 (IE)
Title: Novel acetylcholinesterase inhibitors
Inventor: SCHIRLIN DANIEL
IPC: A61P25/28
Filed: 1990-06-21
Abstract: This invention relates to silylated aromatic fluoro­ketones of the formula (I) and the pharmaceutically acceptable salts thereof, wherein each of m and n is zero or one with the proviso that the sum of m and n is less than two. X is H, Br, Cl, F, R₄, COR₅, CO₂R₅, CONHR₅ or COR₆; R₁, R₂, R₃ and R₄ each are C₁₋₁₀ alkyl, or (CH₂)p aryl, with p being zero, one or two, R₅ is H, C₁₋₁₀ alkyl, phenyl, benzyl or phenethyl, R₆ is (NHCHR₇C(O))qR₈ with R₇ being the residue of any natural occurring α-amino acid, q is one to four and R₈ is OR₅ or NHR₅, Y is H, OH, C₁₋₆ alkyl, C₁₋₆ alkoxy, hydroxy C₁₋₆ alkyl, amino C₁₋₆ alkyl, NH₂, azido, CN, CO₂R₅, COR₅, -SO₃H, Br, Cl, F or -(CH₂)xSiR₁R₂R₃with x being zero, one or two, possessing acetylcholinesterase properties and to their use in the treatment of Alzheimer's disease and senile dementia.
Patent IE-53649-B1 (IE)
Title: Construction of universal egg cell cushion and method
IPC: B65D1/26
Filed: 1982-09-16
Abstract: A new and improved molded egg cell construction and method for its manufacture, wherein the molded egg cell includes a cushion or pillopad on an up-post side wall of the cell which projects inwardly, a thin area formed on the outside of the cell adjacent its bottom which is square, the sides of which are oriented at 45 DEG to the sides and ends of the egg carton incorporating the cell, and in which the bottom is planar on its interior surface but formed with thin areas on the exterior of the bottom, in between which, is a footed formation.
Patent IE-41963-B1 (IE)
Title: Absorptive structure
IPC: B68G5/00
Filed: 1975-12-09
Abstract: 1526778 Absorbent pads PROCTER & GAMBLE CO 19 Dec 1975 [20 Dec 1974] 52158/75 Heading A5R [Also in Division B5] A structure for absorbing body discharges comprises a top sheet 22 and an absorbent element 23 wherein the top sheet is of a liquid-impervious material provided with tapered capillaries 26, each capillary having a base opening dimension of from 0.006 to 0.25 ins., a top opening dimension of from 0.004 to 0.100 ins. and an angle of taper in the range 10‹ to 60‹. The base opening dimension is defined as the maximum dimension of the capillary at its base, which is in the general plane of top sheet 22, and the top opening dimension as the maximum dimension of the top opening. Each capillary may have the form of a conical or pyramidal frustum- or a tapered slot. The structure may be utilised in diapers, sanitary towels, tampons, incontinence pads or bandages.
Patent IE-55079-B1 (IE)
Title: Hollow fiber plasmapheresis module and process
IPC: A61M1/34
Filed: 1983-12-15
Abstract: Hollow fiber plasmapheresis module and process, said module comprising hollow fibers having cell-retaining pores and an effective length (L) to lumen diameter (D) ratio L/D not greater than 16,400 cm-1 D (L and D being in centimeters) within a housing having a blood inlet for conducting blood to the fibers, an outlet for conducting exit (plasma-depleted) blood from the fibers, and a plasma outlet for conducting plasma out of the module.
[US4668399A]
Patent IE-66979-B1 (IE)
Title: Process for the manufacture of thiophene
Inventor: FORQUY CHRISTIAN
IPC: B01J27/045
Filed: 1991-08-28
Abstract: Manufacture of thiophene by catalytic dehydrogenation of tetrahydrothiophene. 
<??>Ruthenium sulphide or a mixture of sulphides of ruthenium and of one or a number of other transition metals is employed as a bulk or supported catalyst.
Patent IE-60877-B1 (IE)
Title: An injection solution of the salt of thioctic acid with trometamol and/or amino acids
IPC: A61K31/385
Filed: 1988-12-02
Abstract: Injectable solution of the thioctic acid salt with trometamol and/or with basic amino acids.
Patent LU-101340-B1 (LU)
Title: Seal valve for a PCI system of a blast furnace
Inventor: HUTMACHER PATRICK
IPC: F27D3/00
Filed: 2019-08-06
Granted: 2021-02-09
Abstract: The invention relates to a valve (1) for a PCI system of a blast furnace. In order to facilitate maintenance of a valve and a PCI system, the invention provides that the valve comprises: - a valve housing (2) with an inlet opening (2.1), an outlet opening (2.2) and a maintenance opening (2.4), - a maintenance door (3) that is adapted to close the maintenance opening (2.4) in an operating position during operation of the valve (1) and that is removable from the maintenance opening (2.4) into a maintenance position, - a valve member (9) movably mounted to the maintenance door (3), wherein, when the maintenance door (3) is in the operating position, the valve member (9) is movable between a closed position for closing the valve (1) and an open position, and, when the maintenance door (3) is in the maintenance position, the valve member (9) is accessible from outside the valve housing (9).
Patent LU-502149-B1 (LU)
Title: Device for arrangement of commutator segments
Inventor: HAN JILI
IPC: H01R43/06
Filed: 2020-12-17
Granted: 2022-06-21
Abstract: The invention includes a mould core, commutator segments, a mica sheet, and a limit body, where the mould core includes a mould core body, grooves, and protrusions, and is sleeved outside a limit shaft on the limit body; a bottom surface of the mould core is flush with an upper surface of a limit plate at the bottom of the limit body; the commutator segment is arranged in and matched with the groove; a clamping slot is formed in the middle of an outer edge of the protrusion; and the mica sheet between adjacent two of the commutator segments is matched with the clamping slot. The device for an arrangement of commutator segments of the present disclosure is simple in structure and convenient to assemble, and can achieve the positioning of the commutator segments and the mica sheet by means of the limit body and the clamping slot.
Patent LU-502639-B1 (LU)
Title: Ein Verfahren und ein System zur Entrauschung von gültigen mikroseismischen Echtzeit-Ereignissen durch die DAS-Ko-Well-Überwachung
Inventor: WANG YIBO
IPC: G01V1/28
Filed: 2022-08-09
Granted: 2023-02-09
Abstract: Die vorliegende Erfindung bezieht sich auf ein Verfahren und ein System zur Entrauschung von gültigen mikroseismischen Echtzeit-Ereignissen durch die DAS-Ko-Well-Überwachung, die zum Bereich der mikroseismischen Überwachungs-technologie gehört. Zuerst wird der Trainingsdatensatz gewonnen, dann wird der Trainingsdatensatz verwendet, um das vorgefertigte Entrauschungsmodell zu trainieren, um das trainierte Entrauschungsmodell zu erhalten, und schließlich werden die Echtzeit-Ereignisse mit mikroseismischer durch DAS-Ko-Well-Überwachung gewonnen, das Trainingsentrauschungsmodell wird dann verwendet, um die Pipelinewellen aus den mikroseismischen Echtzeitereignissen zu entfernen, um die entrauschten mikroseismischen Ereignisse zu erhalten, dies ermöglicht die wirksame Entfernung von Pipeline-Wellen aus mikroseismischen Echtzeit-Ereignissen, die von der DAS-Ko-Well überwacht werden, mit Hilfe eines Entrauschungsmodells, um die Auswirkungen von Pipeline-Wellen auf die nachfolgende Verarbeitung der mikroseismischen Ereignisse zu vermeiden. Darüber hinaus kann die Erfindung so eingestellt werden, dass neue Pipeline-Wellendaten entsprechend dem Zyklus gesammelt werden, um das trainierte Entrauschungsmodell zu aktualisieren und im nächsten Zyklus zu verwenden, so dass das Entrauschungsmodell immer eine gute Entrauschungsleistung aufweisen kann, wenn das Hydraulic Fracturing fortschreitet.
Patent LU-502750-B1 (LU)
Title: Ein verbessertes wässriges Verfahren zur Extraktion von Samenöl aus Ölsaaten
Inventor: MA XIAOHAN
IPC: C11B3/00
Filed: 2022-09-06
Granted: 2023-03-06
Abstract: Die vorliegende Erfindung offenbart ein verbessertes wässriges Verfahren zur Extraktion von Samenöl aus Ölsaaten, das in den folgenden Schritten abläuft: Mahlen der Ölsaatkerne zu Ölsaatkernaufschlämmung; dann Zugabe von Öl- Wasser-Trennmittel zu der Ölsaatkernaufschlämmung und gründliches Rühren, um eine Mischung aus wässriger hydrophiler Substanz und kontinuierlicher Ölphase zu erhalten; das Massenverhältnis des Öl-Wasser-Separators zu der Ölsaat- aufschlämmung beträgt 0.05-1:1; schließlich wird die Mischung durch Zentrifugieren oder Extrudieren getrennt, um die wässrige hydrophile Substanz und die Ölphase enthält. Die vorliegende Erfindung stellt ein verbessertes wässriges Verfahren zur Extraktion von Samenöl aus Ölsaaten zur Verfügung, bei dem eine kleine Menge Öl-Wasser-Trennmittel mit Ölsaatenaufschlämmung gemischt wird, um Samenöl zu extrahieren, wobei die technischen Vorurteile der Fachleute überwunden werden, mit hoher Ausbeute an fertigem Öl, niedrigem Wassergehalt in der Proteinfraktion und einfacher Trocknung; hoher Qualität des fertigen Öls, dessen Säure- und Peroxidwert die nationalen erstklassigen Ölstandards erfüllen oder sogar übertreffen kann und ohne Raffinierung verbraucht werden kann; keine Abfallerzeugung, wodurch das Ziel der vollständigen Nutzung von Ölsaatkernen erreicht wird; niedrige Verarbeitungskosten und umweltfreundlich.
Patent LU-503720-B1 (LU)
Title: High-efficiency electrostatic precipitator for power plant
Inventor: ZHANG JIAN
IPC: B03C3/017
Filed: 2023-03-24
Granted: 2023-11-30
Abstract: A high-efficiency electrostatic precipitator for a power plant is provided, which includes a precipitator body, where a gas exhaust pipe is mounted at the top of the precipitator body, and an activated carbon layer is mounted inside the gas exhaust pipe. By providing the dust cleaning assembly, the user can start the motor when the dust needs to be discharged from the dust discharge pipe, the motor operates to drive the screw rod to rotate, to further drive the threaded sleeve to move, and further drive the dust cleaning plate to move, the dust cleaning plate scrapes off the dust attached to the first filter screen, so as to prevent the dust from blocking the first filter screen, and the dust falls onto the dust guide table. In addition, the screw rod drives the driving bevel gear to rotate during rotation, the driving bevel gear rotates to drive the driven bevel gear to rotate, to further drive the connecting shaft to rotate, and further drive the driving pulley to rotate, so as to drive the driven pulley to rotate through the driving belt to further drive the rotating shaft to rotate, and the rotating shaft drives the dust cleaning bracket to rotate, so that the duct cleaning bracket removes the dust attached to the inner wall of the dust guide table.