367 results about "Open mouth" patented technology

The waterproof and dustproof automobile back door storage box comprises a box body, a box cover and a hinge, an inner cavity of the box body is a storage space, an opening communicated with the storage space is formed in the surface of the box body, one end of the hinge is connected with the box body, and the other end of the hinge is connected with the box cover. The box cover rotates by taking the hinge as a rotation center to open or close the storage space, the box further comprises a rubber strip, the rubber strip is arranged on the box cover and located on the periphery of the corresponding storage space, and when the box cover rotates to close the storage space, the rubber strip seals a connecting gap between the box cover and the box body. According to the design, the adhesive tape is arranged on the box cover and arranged in the peripheral area of the corresponding storage space, and effective sealing of the connecting gap between the box cover and the box body is achieved. When the box cover rotates to seal the storage space, the rubber strip can be tightly attached to the edge of the box body, a good sealing effect is formed, and therefore external moisture and dust are effectively prevented from entering.

The utility model discloses an unloading device with a container rotating protection frame. The unloading device comprises a pallet fork, a rotating accessory, a protection component and a driving component. The pallet fork is provided with a supporting fork and a connecting part; the rotary accessory drives the pallet fork to rotate; the protection component comprises a protection frame, the protection frame comprises a rectangular frame, the protection component swings between an opening position and a protection position, and the protection frame located at the opening position and the supporting forks form an opening for forking the container. The rectangular frame at the protection position abuts against the upper end face of the opening of the container, and the protection frame and the supporting forks tightly hold the container up and down. The driving component drives the protection component to swing. The protective component has the advantages that the protective frame and the supporting forks of the protective component hold the container up and down so as to fix the container; the rectangular frame of the protection component abuts against the upper end face of the opening of the container, so that the container is effectively prevented from cracking and deforming, and the container is effectively protected against damage in the rotary unloading process.

The utility model relates to ship fire -fighting system technical field, proposes a kind of embedded stainless steel fire extinguisher cabinet, including the open mouth setting stainless steel cabinet, the inner bottom wall of the open mouth side of stainless steel cabinet is hinged to connect with inner frame, limit rotation structure is also arranged between the stainless steel cabinet and inner frame to limit rotation angle, the inner side wall of the inner frame is transversely slidably connected with multiple vertical rods, the top of vertical rod is all installed with rubber pressing block, the inside bottom end of inner frame is provided with seat, the seat is all transmission connection with rubber pressing block by holding trigger structure, the side of the closed stainless steel cabinet and inner frame is provided with clamping structure. Through the above technical scheme, the problem that the installed fire extinguisher in the prior art is not coordinated with the indoor furniture arrangement, and often due to ship vibration and wallboard falling off, is not only not beautiful but also not practical.

The vacuum cup with the detachable inner container comprises a top cover, the porcelain inner container and a barrel-shaped shell, the porcelain inner container is detachably installed in the shell in an embedded mode, and a top end opening of the porcelain inner container is sealed by the top cover in a sealed mode. An annular cup bottom bearing ring used for bearing, positioning and fixing the bottom end of the porcelain inner container is installed at the bottom end of the inner cavity of the shell. An annular port silica gel locking ring which is used for circumferential embedding and is used for limiting and fixing the upper end of the porcelain liner is arranged in an internal thread at the opening of the top of the shell, and a step surface which is nested and matched with the inner side surface of the port silica gel locking ring is arranged at the upper end of the corresponding porcelain liner along the axial direction; a plastic cover core which is in threaded connection with the opening in the end part of the porcelain inner container and is used for sealing the top end of the porcelain inner container is also nested in the top cover; the whole installation and connection structure is simple and reliable, installation is convenient, the inner container is convenient to disassemble, replace and clean, and use of a user is effectively facilitated.

The utility model relates to a storage barrel structure and a beverage making machine, and belongs to the technical field of beverage making machines. A material storage barrel structure is used for a beverage making machine and comprises a material storage barrel, the material storage barrel is provided with a material storage cavity, the material storage barrel is provided with a feeding port, a discharging port and an installation opening, and the feeding port, the discharging port and the installation opening are communicated with the material storage cavity; the connecting assembly is detachably arranged on the storage barrel, at least part of the connecting assembly is matched with the mounting opening, at least part of the connecting assembly extends into the storage cavity, the part, extending into the storage cavity, of the connecting assembly is provided with a feeding groove, and the connecting assembly is provided with a through hole used for communicating the feeding groove with the storage cavity; and the feeding cover plate is arranged at the feeding hole in a covering manner. And the connecting assembly is detachably installed on the material storage barrel, so that a user can conveniently disassemble, clean and maintain the device, and cleaning dead corners are avoided. The part, extending to the storage cavity, of the connecting assembly is provided with a feeding groove and a through hole, it is guaranteed that raw materials enter the storage cavity smoothly, and raw material splashing is avoided.

A kind of range hood, comprising: first cabinet, inside hollow forms the first chamber with the bottom with open mouth;Second cabinet, can be movably inserted in first cabinet, second, first cabinet between second cabinet at least lower part is open and located in the lower side of first cabinet with the extended state of second cabinet, and second cabinet is relative to the folding state of first cabinet upward;Smoke baffle, can be movably arranged in the front side of air inlet;Power element and the transmission mechanism connected with the output end of power element, for driving second cabinet and smoke baffle move, when second cabinet moves to folding state, smoke baffle is located in the first position of first cabinet open mouth upper side, when second cabinet moves to extended state, smoke baffle is located in the second position of second cabinet air inlet upper side, the distance between second, first position is greater than the distance between the extended, folding state of second cabinet.The utility model is convenient for controlling each component lifting, and the effect of oil fume absorption is better when working.

The utility model relates to a kind of viscosity control device and roll coating device in roll coating procedure, the viscosity control device is installed on roll coating device, the viscosity control device includes catcher and capillary, the roll coating device includes roll and tank, the roll is installed at the top open mouth of tank, downward capillary is installed on the bottom groove wall, internal space is communicated with capillary, catcher is installed below, the solution contained in the tank drops liquid bead by capillary, the drop frequency of the liquid bead is captured by catcher to judge the change of solution viscosity in tank. Compared with prior art, the utility model monitors solution viscosity change in roll coating process.

An RV waste receptacle includes a top layer formed of flexible, absorbent material, a middle impermeable layer having the planar dimensions of the top layer affixed to the top layer at its front, side and rear edges. A bag formed of impermeable material has an open mouth, sealed side seams and a sealed bottom seam. The bottom seam is joined to a rear edge of the middle layer. A bottom layer is joined to the middle layer forming an open pocket for the bag. The bag includes a pull tab attached to the open mouth. The invention is placed in an RV toilet and used. After use, the pull tab is used to extend the bag. A hand is inserted into the bag grasping the underside of the bottom layer and pulling it and the contents of the layers into the bag to be sealed and disposed of.

The utility model discloses an integrated panel anti-dropping mechanism, which relates to the technical field of warmers and is applied to a panel body and a box body, the panel body is nested at an opening of the box body, a cornice edge is arranged at the edge of the opening of the box body, a plurality of hanging grooves are formed in the cornice edge, and the hanging grooves are connected with the panel body. When the external thread part of the bolt penetrates through the hanging groove to reach the back face of the cornice edge, the bolt is rotated, when the bolt rotates, the threaded hanging piece is driven by friction force to rotate together, so that the threaded hanging piece crosses the avoiding groove to abut against the box body, and then the threaded hanging piece is driven by a threaded connection structure between the external thread part and the threaded hanging piece to move downwards to clamp the box body. The panel body can be kept stable even under the action of vibration or external force, the panel body can be installed only by executing several simple steps of alignment, insertion and rotation during installation, operation is convenient, complex tools or technologies are not needed, and the connection strength between the panel body and the box body is improved while it is guaranteed that the installation steps are simplified.

The utility model relates to the technical field of tree protection devices, and provides a device for protecting the root of a tree, which comprises a mounting seat shell buried in soil, a communicating pipe arranged on the mounting seat shell, an implanting port used for implanting the tree and an opening used for the free growth of the root of the tree; the communicating pipe comprises a water flowing main pipe body and an air flowing branch pipe body, the water flowing main pipe body penetrates through the mounting seat shell and is obliquely arranged on the mounting seat shell, the air flowing branch pipe body is communicated with the water flowing main pipe body, the air flowing branch pipe body is obliquely arranged on the water flowing main pipe body, and the inclination angle between the air flowing branch pipe body and the water flowing main pipe body is smaller than 90 degrees. The problem that in the prior art, the root of a tree cannot obtain enough air, and consequently the respiration of the root of the tree is affected is solved.

The utility model discloses an inner and outer weld joint paint supplementary coating device, including transmission frame, set up in the mouth department of transmission frame left end equipment mechanism, install in the inside seam spraying mechanism of transmission frame middle end and fixed in the transmission frame right end bottom barrel department equipment mechanism, transmission frame bottom and support frame top vertical connection, open mouth bucket place on the conveyer chain inside transmission frame, the mouth department of equipment mechanism includes the fixed plate of fixed in transmission frame left end back side, and the fixed plate rear end top is equipped with the cylinder, and the cylinder telescopic end is fixedly connected with the mouth driven plate rear end, and the mouth driven plate both ends bottom is slidably connected with the fixed plate both ends top guide rail, and the mouth driven plate top is equipped with the driven wheel, and transmission frame left end front side is equipped with the fixed bottom plate, and the fixed bottom plate both ends guide rail top is equipped with the mouth transmission plate, and this device can paint automatically to the open mouth bucket to the inner and outer weld joint, save manpower, reduce operator's labor intensity, increase supplementary coating efficiency.

Integrated liner seal, dispensing aperture and spout for controlled dispensing of a product from a container. In various embodiments the integrated liner seal provides a liner construction that can be easily and inexpensively manufactured, is easy to remove, will not interfere with liner insertion or heat sealing, and provides the necessary barrier functionality and strength, e.g., to resist delamination or rupture of the liner or pull tab while separating the liner from the container rim. A liner with a product orifice that is smaller (more restricted) than the opening provided by the rim (open mouth) of the container, for dispensing a product through the restricted orifice. A liner with an integrated dispensing orifice and spout to facilitate controlled dispensing of a product through the orifice and spout.

The utility model discloses an anti-splashing breathing machine extension tube which comprises a sealing device. One end of the elastic element is connected with the sealing device; the sleeve is connected to the outer part of the elastic element in a sleeving manner; one end of the sleeve is connected with the sealing device; the air inlet assembly is communicated with the outer side of the sleeve; the ventilation pipeline is located in the sleeve, and the ventilation pipeline is connected with the other end of the elastic element; the one-way valve structure is arranged on the inner side wall of the end, close to the elastic element, of the ventilation pipeline and used for communicating the sealing device, the elastic element and the ventilation pipeline to form a first channel; the connector is of a cylinder structure with one end opened, a containing groove is formed in the cylinder structure, the connector is connected to the outer portion of the ventilation pipeline in a sleeving mode through the containing groove, and the end face of an opening of the connector is connected with the sleeve. By arranging the sealing device and the one-way valve structure, the situation that pollutants are splashed in the trachea intubation process can be avoided; in addition, through mutual cooperation of the air inlet assembly, the elastic element, the ventilation pipeline and the sleeve, functional adaptation and full-automatic switching in all modes can be achieved.

The utility model relates to the technical field of household articles, and disclose a kind of plush composite bed canopy, comprising: for installing on mattress bed canopy fence, cover in the mattress and with bed canopy fence connection plush cover, and set between the mattress and plush cover and with the connection of plush cover composite bottom cover;The rim of the open mouth of the plush cover is provided with dismounting mechanism between bed canopy fence outer peripheral wall;The plush cover includes the second clamping sleeve surface covered on the mattress fabric layer, and the rim of the second clamping sleeve surface is provided with the second edge covering surface for being covered on the outer peripheral wall of mattress.It is fixed on the fabric layer of mattress by the clamping effect of composite bottom cover and plush cover, and the mattress is directly fixed in the first clamping sleeve surface and the second clamping sleeve surface inside, so that the mattress is integrated with bed canopy, and the effect of fixing mattress can be met after wrapping and fixing bed canopy on mattress.

The invention discloses an audio system and a vehicle, the audio system comprises a mounting bracket, an audio device and a locking assembly, the mounting bracket forms an accommodating groove, one side of the accommodating groove along a first direction is opened to form an opening, the audio device is accommodated in the accommodating groove, and one side of the audio device away from the opening is provided with a first locking structure; the locking assembly is mounted on the side, away from the opening, of the mounting support and comprises a driving mechanism, the driving mechanism comprises a motor and a locking mechanism, a motor shaft of the motor is connected with the locking mechanism so as to drive the locking mechanism to be switched between the locking state and the unlocking state, the locking mechanism is provided with a second locking structure, and in the locking state, the locking mechanism is unlocked. The second locking structure is in locking fit with the first locking structure in the unlocking state, and the second locking structure is separated from the first locking structure in the unlocking state. According to the audio system provided by the embodiment of the invention, the number of parts of the locking assembly is reduced, the manufacturing cost of the parts is reduced, the structure is relatively simple, and the assembly is simpler.

The utility model relates to a multifunctional plant cultivation container which comprises a container body which is of a hollow structure with an upward opening, a water body is placed in the container body, and aquatic plants are placed in the water body. The incense insert is of a hollow structure with an upward opening, a hook part is arranged on the outer side of the upper end, and the hook part is clamped to the upper end of the edge part of the container body and corresponds to the interior of the container body; and the lower end of the incense stick is inserted into the incense insert. The hook part is arranged on the outer side of the upper end of the incense plug and clamped to the upper end of the edge part of the container body, and the incense plug is located in the container body and only occupies the space of the container body. Aquatic plants are cultivated in the container body, incense is burnt in the incense plug, the indoor temperature and humidity are adjusted, meanwhile, visual enjoyment and olfactory enjoyment are brought, and therefore the indoor living environment is improved. The multifunctional plant cultivation container is simple in structure and high in function integration degree. And the incense plug is connected with the container body in a clamping manner, so that the incense plug and the container body are convenient to mount, dismount and replace.

The utility model discloses a cleaning robot base station which comprises a shell and a robot cabin, the robot cabin comprises a lower cabin body arranged on the shell and located below a middle cabin body, a lower cabin door used for opening or closing the lower cabin body and a cabin door driving part used for driving the lower cabin door to be opened or closed, and the front side face of the lower cabin body is in an open shape. Lower sliding grooves extending from the vertical direction to the horizontal direction are formed in the left side face and the right side face respectively, the lower bin door comprises a plurality of lower door plates which are sequentially and flexibly connected or hinged and lower sliding grooves formed in the shell, each lower sliding groove comprises a vertical part and a horizontal part, the lower door plates are installed on the lower sliding grooves, and when all the lower door plates are located on the vertical parts, the horizontal parts are located on the horizontal parts. And the lower bin body is closed. The totally-closed robot cabin enables the structure in the cabin and the robot to be hidden during maintenance, and the totally-closed lower cabin body and the sound-absorbing cotton are combined, so that noise generated during mop cleaning and mobile phone dust collection can be isolated to a large extent.

The utility model belongs to packaging technical field discloses a kind of packing boxes. This packing box includes box body, box cover, inner box and lifting piece, wherein, box body has communicating space and open mouth;Box cover is connected with box body bending, and can be covered in open mouth;Inner box is at least partially housed in accommodating space, and the side of inner box towards box body bottom wall is provided with tongue, and tongue is limitedly inserted in box body bottom wall;Lifting piece is connected between box cover and inner box, and bending box cover can make lifting piece drive inner box to lift or fall to accommodating space. By bending box cover, lifting piece can be driven to rotate to make inner box lift or fall, which can fully display products without affecting the normal closing of the packing box. By the way that the tongue is limitedly inserted in the bottom wall of the box body, the inner box can be stably placed in the accommodating space. Different types of inner boxes can be replaced according to actual packaging needs, and the inner box will not shake left and right during lifting or falling.

The utility model discloses an anti -skidding scalding ceramic cup relates to ceramic cup technical field, and the utility model discloses an anti -skidding scalding ceramic cup, which is characterized by comprising a cup body, the anti -scald handle is fixedly connected to the cup body outside surface, cup cover is equipped with cup body top, the open mouth is passed through and is equipped with cup cover top surface, the clamping mechanism is equipped with cup cover top, the clamping mechanism includes the clamping groove of setting in cup cover top surface, the clamping groove inner chamber one side surface penetrates and clamps and embeds sliding connection to have clamping plate, the clamping plate top surface is fixedly connected with push block, and the clamping groove inner chamber is equipped with clamping spring, through being provided with the open mouth and clamping mechanism, can conveniently carry out the clamping placement of the stirring spoon used in ceramic cup, is more humanization, and when not using stirring spoon, the open mouth is shielded, avoids the sundries of outside to enter the cup body, through push block movement clamping plate, will clamping plate contract to clamping groove, when to the extrusion of clamping spring.

The invention relates to a medical waste temporary storage box which is characterized in that a box body comprises skin plates covering and fixed on five surfaces of a frame, the frame is a square frame body, a top cover opening is formed in the skin plate located on the top surface, a top cover is connected along the rear edge of the top cover opening through a hinge, and a front cover is installed on the front frame surface; after the front cover is closed, a closed object carrying box containing space is formed, the top of the object carrying box is an opening, the garbage bag is arranged in the object carrying box in a sleeved mode from the opening, and the edge portion of a bag opening is bent outwards at the edge of the opening to be reliably fixed. Medical wastes are put into the garbage bag in the carrying box, and a temporary storage accommodating space is formed by the normally closed top cover, the front cover and the closed box body, so that volatilization of harmful substances and environmental pollution are avoided; the front cover is locked through threaded connection and needs to be opened by people, so that the opening difficulty and frequency of the front cover are reduced, and pollution to the external environment is avoided to the greatest extent; and the top cover seals the box body in an interlocking electric control mode, so that the medical wastes are convenient to throw.

The invention discloses a quick-release wagon coupler lifting rod seat and a wagon, belongs to the technical field of railway locomotives, and solves the technical problems that a coupler lifting rod jumps due to poor running line conditions in the running process of the wagon, the periphery of a guide hole is easy to wear, and the guide hole is difficult to replace after being worn. According to the solution, a rotating hole is formed in the upper portion of a connecting plate in the horizontal direction, an opening is formed in the portion, above the rotating hole, of the connecting plate, a guide hole is formed in the lower portion of the connecting plate in the horizontal direction, the opening, the rotating hole and the guide hole communicate with one another, and a wear-resisting guide sleeve is fixedly arranged on the inner wall of the guide hole; the spring bolt assembly is movably arranged at the position of the opening, the root of the spring bolt assembly is hinged to the side, away from the fixing plate, of the connecting plate, the end of the spring bolt assembly is in lap joint with the positioning block, and the spring bolt assembly comprises a bolt plate, a guide block, a check block and a spring piece plug pin. The uncoupling device can prevent accidental uncoupling faults in the running process of a vehicle, and the uncoupling rod or the uncoupling rod seat can be quickly maintained and replaced after being abraded.

The utility model discloses a combustion furnace with a transparent ring body, and relates to the technical field of combustion furnaces. The combustion furnace comprises a combustion furnace body, a fire gathering cover and a transparent ring body, a first opening is formed in the combustion furnace body; the fire gathering cover is assembled on the upper side of the combustion furnace body, a second opening is formed in the middle of the fire gathering cover, and the area of the second opening is smaller than that of the first opening; the transparent ring body is detachably assembled on the fire gathering cover and communicates with the interior of the combustion furnace body through the second opening. By adopting the technical scheme, the furnace has the advantages that the upper part of flame in the furnace is more concentrated, and the flame can be observed through the transparent ring body.

The utility model relates to a wellhead protection device of a geothermal well. Comprising a wellhead main body, a recharge cylinder assembly is arranged at the upper end opening of the wellhead main body, and a drain outlet and a water return pipe are connected to the peripheral wall of the recharge cylinder assembly in a communicating mode; at least two sets of installation notches evenly distributed in the circumferential direction are formed in an upper end opening of the well mouth body, and jacking assemblies are arranged in the installation notches and used for being connected with the recharge cylinder assembly and driving the recharge cylinder assembly to ascend and descend. The jacking assembly comprises a driving rack which is movably connected with the bottom of the recharge cylinder assembly and is longitudinally arranged, and further comprises a lifting driving mechanism for driving the driving rack to longitudinally move; a cylinder cover is mounted at a top opening of the recharge cylinder assembly, and a pipe connecting structure matched with the water taking pipe in an inserted manner is mounted in the center of the cylinder cover; and the filter cartridge is arranged in the inner cavity of the recharge cylinder assembly and is used for filtering recharge water. The geothermal well lid opening and supporting device can filter recharge water, rapidly open and support a geothermal well lid, reduce labor intensity, prevent the well lid from inclining and falling, and is simple in structure and convenient to use.

The utility model is applicable to the technical field of dust removal bags, and provides a glass kiln dust removal bag with a leakproof bag head, which comprises a mounting frame, a connecting rod is vertically arranged in the mounting frame, one end of the connecting rod penetrates out of an opening arranged at one end of the mounting frame, and a filter bag body is wrapped on the outer side of the mounting frame. A bag opening of the filter bag body is formed in an opening of the mounting frame, a sliding sleeve is further slidably connected to the outer wall of the connecting rod, a plurality of fixing mechanisms are fixedly mounted on the outer side of the sliding sleeve at equal angles, and each fixing mechanism is detachably connected with the bag opening of the filter bag body. The bag opening of the filter bag body is pressed into the arc-shaped groove formed in the bottom wall of the arc-shaped block, and the bag opening is fixed through relative extrusion of the first pressing plate and the second pressing plate, so that the bag opening is stably assembled on the upper connecting ring, the bag opening is prevented from being separated from the mounting frame, and protection is provided for subsequent leakage prevention of the filter bag.

The application relates to a candle pop. The candle pop comprises a shell, a wax base, a wick and a driving mechanism. The shell is provided with a containing cavity. The wax base is arranged in the containing cavity. The wick is arranged in the wax base and is used for burning the wax base. The wick has a burning section exposed outside the wax base and used for burning. The driving mechanism is arranged on the shell and drives the wax base to slide in the containing cavity, so that the distance between the free end of the burning section and the open mouth of the containing cavity and the wax base is within a set range. Thus, the position of the free end of the burning section in the containing cavity is basically kept constant, so that the position of the flame in the containing cavity is basically kept constant, that is, the height of the flame is basically kept unchanged. In the case that the height of the flame is basically kept unchanged, the user can observe the flame through a basically constant visual angle without frequently changing the visual angle to adapt to the flame with a great change in height. Thus, the flame generated by the burning section has a reasonable observation visual angle, so that the user experience is improved.

The utility model is suitable for the technical field of line monitoring, and provides a line fault monitoring device, which comprises a monitoring main body, the plurality of wiring jacks are arranged on the outer side wall of the monitoring main body; protection assemblies are arranged on the outer sides of the plurality of wiring jacks; the protection assembly comprises a group of first connecting plates, first connecting springs, second connecting plates and bearing plates which are symmetrically arranged on two sides of the wiring jack; the protective cover is arranged on the outer sides of the two first connecting springs, and the side, away from the monitoring body, of the protective cover is open; according to the utility model, the operation convenience, the reliability of electrical connection and the overall stability of the system are improved; by means of the design, the insertion process of an external wire is simplified, interference-free transmission of electrical signals is guaranteed, clamping stability of a circuit or a cable is enhanced, interference of an external electromagnetic field is effectively resisted, and therefore accuracy of monitoring data and stable operation of the system in various environments are guaranteed.

The utility model relates to the technical field of automatic vending, in particular to a self-service vending device. The self-service vending device comprises a cabinet body, a cabinet door, a locking piece and an electric control lock, the cabinet body comprises a first side wall and a second side wall which are oppositely spaced, and an opening in the cabinet body is located between the first side wall and the second side wall; the first side of the cabinet door is pivoted with the first side wall, and the cabinet door has an opening position for opening the opening and a closing position for closing the opening; the locking piece is fixed to the second side of the cabinet door and located in the middle of the cabinet door in the height direction. The electric control lock is installed on the second side wall and comprises a first shell, a second shell and a lock body, the lock body is installed in a containing cavity of the first shell, and the lock body comprises a spring bolt capable of stretching out of or retracting into the containing cavity; when the cabinet door is located at the closing position and the spring bolt stretches out, the spring bolt is matched with the locking piece in an inserted mode so as to lock the position of the cabinet door, and when the spring bolt retracts, the cabinet door can rotate to the opening position. The self-service vending device is good in anti-theft performance and good in durability.

The utility model discloses a novel kitchen airflow type oil fume discharge pipeline, which relates to the field of oil fume discharge pipelines, and comprises flues spliced by connecting flanges, a sealing ring is arranged between the spliced connecting flanges, one side plate of each flue is provided with an opening, the inner wall of each opening is fixedly provided with a visual window, and the inner wall of each visual window is provided with an air inlet. A pushing mechanism penetrating to the inner wall of the flue is installed at the position, located above the opening, of the side plate of the flue, a fixing base is fixedly installed on the inner wall of the side plate of the flue, and the fixing base is connected with a baffle through a rotating reset mechanism. By arranging the visual window, the rotary reset mechanism, the pushing mechanism and the baffle, the situation inside the flue can be observed from the outside, the baffle can effectively prevent oil stains from being directly adhered to the visual window, and therefore whether the flue needs to be cleaned or not can be judged in a direct observation mode, and inspection can be conducted after cleaning.