41 results about "Metal hook" patented technology

This utility model relates to the field of medical device technology and discloses a hand surgery positioning device, including a positioning mechanism, a cleaning mechanism at the bottom of the positioning mechanism, and a main body structure at the bottom of the cleaning mechanism. This utility model, by setting up a positioning mechanism and using a soft rubber strap, and utilizing the cooperation of hooks and stainless steel hooks, ensures that the hand is gently and firmly fixed during surgery, reducing surgical risks caused by unnecessary movement. The design of the stainless steel hooks allows for moderate expansion and contraction, avoiding discomfort caused by excessive restraint and improving the patient experience. The cleaning mechanism located below the positioning mechanism, with a body structure featuring planar drainage holes and channels, facilitates thorough rinsing of the hand before and after surgery. The drain pipe configuration further simplifies the liquid discharge process, maintaining a clean and tidy surgical environment and reducing the risk of infection.

The utility model relates to ACDC power supply technical field especially is a kind of modularization ACDC power supply interface extension device, including ACDC power supply ontology and interface extension mechanism, ACDC power supply ontology side is equipped with interface extension mechanism, interface extension mechanism bottom end fixedly connected with limiting plug-in post, limiting plug-in post is inserted in support subassembly, support subassembly includes the supporting plate, the limiting hole of limiting plug-in post is opened in supporting plate outside, the inter-plate slot is opened in supporting plate inside, and the installation component is fixedly connected with in supporting plate outside, the inter-plate hole is opened in supporting plate inside, and the hollow tube is fixedly connected with in inter-plate hole inside, and the buffer mechanism is installed in supporting plate inside, and installation component includes metal hooking piece, and rubber hollow column is adhesively fixed in metal hooking piece side, in the utility model, when device suffers external force vibration, can realize the efficient absorption and dissipation to vibration energy by compound buffer mechanism, prevent the damage due to stress concentration at connecting place, ensure that interface part is always in good condition, facilitate subsequent disassembly maintenance.

The utility model relates to the technical field of fitness equipment, and discloses an indoor and outdoor dual-purpose composite structure suspension fitness belt which comprises a metal hook, an annular connecting part is arranged at the lower end of the metal hook, a soft rubber door holder is arranged at the lower end of the annular connecting part, and a connecting woven belt is arranged on the annular connecting part and located on the outer side of the soft rubber door holder. After penetrating through the annular connecting part of the metal hook, the connecting braid extends towards the left side and the right side and wraps the soft rubber door holder, finally, a closed loop is formed through sewing, and the fitness belt body is arranged at the lower end of the connecting braid. According to the indoor and outdoor dual-purpose composite structure suspension fitness belt, the metal hook and the soft rubber door holder can be matched with each other to form a composite structure, indoor and outdoor use is achieved, a symmetrical stress structure is formed after the soft rubber door holder is wrapped by the connecting braid, and single-side stress concentration is avoided.

The invention relates to a preparation method of a novel corrosion-resistant coating for a metal material, and belongs to the technical field of metal corrosion-resistant coatings. The preparation method comprises the following steps: sequentially adding 3, 3-diamino-4, 4-dicarboxyl biphenyl and cerous nitrate into a reaction kettle with a mixed solvent, carrying out ultrasonic treatment and heating reaction, distilling to remove the mixed solvent, and cooling to room temperature to obtain a cerium-containing precursor; the preparation method comprises the following steps: adding epoxy resin and epoxy cyclohexyl-polyhedral oligomeric silsesquioxane into solvent oil, then adding a cerium-containing precursor, carrying out a heating reaction, and carrying out ultrasonic treatment; continuously adding a curing agent, and stirring to obtain the novel corrosion-resistant coating. Coating the cleaned metal hook by using a dip-coating method, and drying at room temperature; the novel corrosion-resistant coating prepared by the preparation method disclosed by the invention is good in humidity and heat resistance and excellent in corrosion resistance.

1. Name of the designed product: press metal hook. 2. Use of the designed product: hook for car. 3. Design points of the designed product: in shape. 4. Picture or photo showing the design points: perspective view.

The utility model discloses a high courtyard lamp installation structure which comprises a high courtyard lamp assembly, and the high courtyard lamp assembly comprises a high courtyard lamp body, cooling fins arranged on the high courtyard lamp body, a threaded cylinder arranged on the back face of the high courtyard lamp body and a cover plate arranged above the threaded cylinder. A hoisting assembly, the hoisting assembly comprises a hoisting hook attached to the surface of the cover plate, a threaded rod penetrating through the hoisting hook, a hanging hole formed in the side wall of the hoisting hook, a metal hook hooked into the hanging hole, a rectangular notch formed in the hook part of the metal hook, a notch groove formed in the tail end of the metal hook, a rotating shaft arranged in the notch groove and a connecting rod connected with the rotating shaft. The limiting block is connected to the tail end of the connecting rod; and the limiting groove is formed in the top of the hoisting hook. According to the high courtyard lamp, the high courtyard lamp assembly and the hoisting assembly are matched with each other, so that when the high courtyard lamp is hoisted and installed, the problem that the high courtyard lamp shakes is solved, and the use stability of the high courtyard lamp is improved.

The invention discloses a lower cover disassembling and separating process of an electric energy meter, which relates to the technical field of electric energy meter disassembling and comprises the steps of discharging, disassembling a lower cover screw, recovering the lower cover screw, disassembling a single-phase nut, recovering the single-phase nut, disassembling a three-phase nut, recovering the three-phase nut, turning over the lower cover, disassembling a metal hook, recovering the metal hook, recovering the lower cover of the electric energy meter and the like. The positioning assemblies arranged on all the stations can rapidly recognize the positions of components, precise and rapid disassembling is achieved through cooperation of the positioning assemblies and the special disassembling assemblies, the disassembling period of the lower cover of the single electric energy meter is greatly shortened, all the disassembling stations are matched with the special recycling assemblies, the disassembled components can directly enter the corresponding collecting containers through the recycling assemblies, and the working efficiency is greatly improved. The problems that a traditional manual disassembling mode and a semi-automatic mechanical disassembling mode are low in disassembling efficiency and poor in adaptability for different types of electric energy meters, equipment parameters need to be debugged again when product types are replaced, and consequently the downtime of equipment is long are solved.

The application relates to the technical field of medical devices, in particular to a multifunctional turning-over pad, which comprises a cotton pad, the bottom of the cotton pad is provided with a supporting assembly, and the left and right sides of the supporting assembly are provided with transfer assemblies; the multifunctional turning-over pad can be used for providing buffer support for the body of a patient through a honeycomb-shaped through-hole structure of a breathable soft pad, and the overall supporting force is enhanced through an arc-shaped edge structure made of a high-molecular composite material of a hard supporting plate. Meanwhile, a tension belt and a bending plate are matched with metal hooks of the transfer assemblies through positioning holes, so that the supporting assembly can dynamically adjust the body position of the patient in the transfer process through the elastic nylon woven structure of the tension belt, thereby achieving the effect that the device can safely transfer and fix the body position of the patient through the synergistic effect of the supporting assembly and the transfer assembly.

The invention relates to electroplating equipment for IGBT cooling fins and an electroplating production line, and belongs to the technical field of electroplating, the electroplating equipment comprises an electroplating bath, a fixing frame and a flow guide frame, a driving device is arranged below the electroplating bath, the driving device is used for agitating electroplating liquid in the electroplating bath to form pulse liquid flow flowing from bottom to top, the fixing frame is configured to be connected with a conveying steel belt, and the flow guide frame is connected with the conveying steel belt. The fixing frame is arranged on the electroplating bath and right faces an anode of the electroplating bath, a metal hook assembly is arranged on the fixing frame and comprises a fixing part and a deflection part, a blade assembly capable of driving the deflection part to deflect in a reciprocating mode is arranged on the deflection part so as to shake off bubbles on the cooling fins, the flow guide frame is located outside the cooling fins, and an annular micro-motion gap is formed between the flow guide frame and the cooling fins. The upper end and the lower end of the flow guide frame are each provided with a strip-shaped frame internally provided with a compression channel. The accelerating laminar flow capable of rising is arranged in the electroplating bath, the accelerating laminar flow scours bubbles attached to the needle root of the cooling fin, and it is guaranteed that the concentration of electroplating liquid in the vertical direction of the cooling fin is uniform.

A panel fastener has a casing, a hook, and cam assembly. The hook and cam assembly has a metallic hook and a cam assembly. The hook has a round cam mounting hole and two opposing side surfaces. The cam assembly has a round cam plate that includes a central camming portion conforming with the cam mounting hole. The cam plate also has an offset cam shaft formed with a socket. The cam assembly also has a metal spring plate coupled to the cam plate. The spring plate has two, peripheral wiper portions and a bearing portion positioned between the two wiper portions to form two clearing gaps therebetween. The wiper portions are positioned to scrape debris from the hook during rotation of the spring plate.

The invention discloses a gypsum 3D printing fiber and metal material adding mold-free production method, and relates to the technical field of material 3D printing, the method comprises the specific steps of raw material pretreatment, AI model construction, 3D model treatment, gradient ratio printing and post-treatment and optimization; according to the method, through fusion of AI self-adaptive matching and 3D printing, the problems that in traditional gypsum component production, mold dependence is caused, the shape is limited, and the material matching is rigid are solved, mold-free production is achieved through application of the 3D printing technology, and meanwhile, the production flexibility and integrity are improved in combination with the synchronous implanting technology of the metal hook; the AI self-adaptive matching model dynamically adjusts a matching scheme of fibers and metal materials through a three-layer network structure in combination with regional feature weights and material compatibility constraints according to differential performance requirements of a bearing area, a decoration area and a transition area of a component, so that the structural strength of the bearing area is guaranteed, and the flexibility and the surface texture of the decoration area are also considered.

The utility model discloses a heavy object lifting tool, which relates to the technical field of heavy object carrying auxiliary tools and comprises a tubular metal rod, a rotating component is arranged in the tubular middle of the metal rod, and a metal hook is arranged below the rotating component. The lifting rod is used for two-person operation, the difficulty of heavy object carrying can be greatly reduced, the rotatable metal hook is used for being aligned to a proper lifting part of a heavy object, is slowly inserted and hooked, and stably applies force to lift the heavy object, if the posture of the heavy object needs to be adjusted in the process, the metal hook can flexibly drive the heavy object to rotate by means of the rotation performance of the thrust ball bearing, and the heavy object is lifted. An operator can easily and accurately carry a heavy object to a designated position, meanwhile, the flat structure can increase the contact area with the hand of the operator, the pressure of the hand is relieved, slipping and scratching are avoided, and heavy object carrying operation is efficiently completed.

The utility model relates to the technical field of insect damage prevention heat preservation device, disclose a kind of flower planting insect damage prevention heat preservation device, including high-density insect-proof netting heat preservation cover, the bottom of high-density insect-proof netting heat preservation cover is movably inserted with the support connecting cover extending to inside, the bottom of the support connecting cover is provided with assembly mechanism. The utility model is equipped with assembly mechanism, and the assembly between upper connecting sleeve and lower connecting sleeve is conveniently completed, and the dismounting operation is simple, so that cleaning maintenance is more convenient, the base area is conveniently cleaned, the change of different growth stages and management needs of plant is adapted, and after locking, the situation that the protection effect can be avoided to leave gap influence can be avoided;By being provided with hook mechanism, the device can be individually hung high-density insect-proof netting heat preservation cover and support connecting cover from top to carry out insect damage prevention heat preservation to flower, conveniently complete the adjustment and fixation of the use height of metal hook, and the device is conveniently hung.

A panel fastener has casing, a hook, and a cam assembly. The hook and cam assembly has a metallic hook and a cam assembly. The hook has a round cam mounting hole and two opposing side surfaces. The cam assembly has a round cam plate that includes a central camming portion conforming with the cam mounting hole. The cam plate also has an offset cam shaft formed with a socket. The cam assembly also has a metal spring plate coupled to the cam plate. The spring plate has two, peripheral wiper portions and a bearing portion positioned between the two wiper portions to form two clearing gaps therebetween. The wiper portions are positioned to scrape debris from the hook during rotation of the spring plate.

The utility model belongs to the technical field of rapid surface skin cleaning, and discloses a handheld rapid surface skin debridement device which comprises a fixing plate, a plurality of fixing sleeves are fixedly arranged in the fixing plate, a plurality of square grooves are formed in the outer sides of the fixing sleeves, reinforcing rings are arranged in the fixing sleeves in a sliding mode, and the reinforcing rings are arranged in the square grooves in a sliding mode. Buckles are fixedly arranged on the two sides of the bottom face of the reinforcing ring and connected with the square grooves in a clamped mode, first pull ropes are fixedly arranged on the inner sides of the buckles and penetrate through the reinforcing ring, a connecting shaft is fixedly arranged on the bottom face of the reinforcing ring, and a nail head is fixedly arranged at the bottom of the connecting shaft; according to the wound cleaning nail, slough or scabs, biological membranes and the like of a wound can be scraped off, so that the cleaning efficiency of the wound is improved, and medical staff can conveniently carry out medicine changing, excision and other work on the wound.

The invention discloses a manufacturing method of a metal magic tape used in a specific high-temperature environment and a corrosion environment. The manufacturing method comprises the following steps: S1, preparing an initial composite wire raw material; s2, reducing and drawing; s3, twisting is carried out; s4, performing high-temperature shaping and soft annealing; s5, electrochemical separation; s6, preparing a semi-finished product of a blank belt of the metal magic tape; and S7, preparing a finished product of the metal magic tape. The metal magic tape (magic tape) is prepared by proportionally interweaving synthetic metal and 316L main body materials through warp yarns, weft yarns and surface yarns, can resist high temperature of over 1000 DEG C, has the characteristics of permanent flame-retardant function, high temperature resistance and corrosion resistance, can continuously and normally work, meets the ultra-high-temperature use requirement, can be quickly buckled and fixed without welding, and has the advantages of simple structure, low cost and the like. And quick disassembly can be realized.

The utility model provides a pair of sock blanking tidying mechanism which comprises a rotary table and a tidying channel, the tidying channel is connected with the rotary table, a conveying belt is arranged below the tidying channel, a layer of strong magnet is fixedly arranged on the conveying belt, and the surface of the tidying channel is subjected to smooth treatment. According to the paired sock falling and sorting mechanism, socks fixed in pairs fall onto the rotating disc from the sock falling opening through the metal hooks and enter the sorting channel through the guide strip, the metal hooks attract the socks to the other end of the sorting channel under the action of the magnetic conveying belt, and due to the fact that the conveying belt is obliquely arranged, the socks can be conveniently sorted. The ends, provided with the metal hooks, of the socks face the same side, the effect of arranging the socks is achieved, and workers can conveniently package the socks when standing at the notches.

The utility model relates to the field of coking production devices, and discloses a combined type drag hook which comprises a supporting metal drag hook used for dragging and hanging, the right side of the supporting metal drag hook is fixedly connected with a connecting supporting plate, a plastic hanging frame is nested outside the connecting supporting plate, an installation notch is formed in the top end of the connecting supporting plate, and the plastic hanging frame is fixedly connected with the supporting metal drag hook. A positioning turnover assembly is installed on the inner side of the plastic hanging frame so that the plastic hanging frame can be disassembled and assembled conveniently, a reinforcing positioning assembly is installed at the top end of the plastic hanging frame so that installation between the plastic hanging frame and the supporting metal drag hook can be stable, and the reinforcing positioning assembly comprises a fixing block located at the top end of the plastic hanging frame. And a limiting strip is fixedly connected to the interior of the fixed block. According to the disposable infusion support, the use safety of the device is improved, secondary injury to a patient is avoided, the plastic hanging frame is made of disposable materials, and the use convenience of the device is improved.

The utility model discloses a kind of level transmitter shell structures, involve tuning fork liquid level switch application field, including tuning fork liquid level switch shell and tuning fork sensor, tuning fork liquid level switch shell one end is equipped with second outer thread, the outer thread of second outer thread is connected with second nut, the side of second nut is provided with extension block, recess is equipped in the side of extension block, the outside of tuning fork sensor is equipped with compression ring, the side of compression ring is provided with metal hook.The utility model is equipped with second outer thread in the one end of tuning fork liquid level switch shell, the outer thread of second outer thread is connected second nut, the outside of tuning fork sensor is equipped with compression ring, compression ring is connected by metal hook and the second nut installed at tuning fork liquid level switch end portion, and then by metal hook when second nut is twisted, tightening compression ring will be pulled, make compression ring firmly compress tuning fork sensor whole, to reduce the risk that circuit equipment in tuning fork liquid level switch shell is damp.

This utility model discloses an auxiliary device for hoisting construction materials, including a hoisting rope end. The hoisting rope end is connected to a linear boom via a steel wire lifting ring. A square enclosure frame is welded to the linear boom. Hoisting rope mounting seats are welded to the four corners of the square enclosure frame. A steel wire rope is installed at the bottom of each hoisting rope mounting seat. A hook connection is fixedly connected to the bottom of each steel wire rope. A metal hook is welded to the bottom of each hook connection. A material hook groove is formed on the inner side of the metal hook. This utility model ensures that the center of gravity is located within the inner cavity of the square enclosure frame during hoisting by welding hoisting rope mounting seats at the four corners of the square enclosure frame and using these mounting seats to install the steel wire rope. This prevents the center of gravity from shifting to one side and causing the material to tilt. Additionally, a limit bolt is threaded into the through hole at the end of the metal hook to ensure stability during hoisting.

The unlocking structure comprises an upper support and a lower support, the upper support is of a square structure, the unlocking structures are installed on the front side and the rear side of the upper support respectively, the bottoms of the unlocking structures are connected with the lower support, and front wheels and rear wheels are installed at the bottom of the lower support. The locking device has the advantages that the structural design is reasonable, the limiting column drives the metal hook to generate displacement by pressing the unlocking button, the whole camping car is unlocked, and the FF0C is convenient to fold and use.

The utility model discloses a multi -angle adjustable metal hook, including installation mechanism, the installation mechanism includes the mounting bracket, adjustable metal hooking mechanism, adjustable metal hooking mechanism includes locking post, rotating motor and hook body, the end portion threaded penetration of locking post is connected in the middle part of mounting bracket, and the one end of locking post is equipped with driven adjusting gear, rotating motor is fixed in the upper portion of one side of mounting bracket, and the output of rotating motor is equipped with the fixed drive adjusting gear, and is mutually engaged between with driven adjusting gear, the middle part of locking post is equipped with the fixed hole block of sleeve, and the back of hook body is fixed with the middle part of the front of hole block. The utility model can satisfy the short personnel to complete to the hooking of object, save time and effort, reduce the risk that high altitude brought, satisfy the required of using, promote the use effect.

1. Name of the designed product: metal hook (detachable metal hook). 2. Use of the designed product: for hook. 3. Design points of the designed product: in shape. 4. Picture or photo best indicating the design points: perspective view.

The application relates to a special-shaped metal hook punching processing equipment and relates to the field of punching equipment. The equipment comprises a punching part and a clamping part. The punching part comprises a base, a support plate and a top plate. The base is fixedly assembled through fixing screws, two support plates are vertically and symmetrically arranged on the top surface of the base, the top surface of the support plate is horizontally fixedly assembled with the top plate, a female die is horizontally fixed below the two support plates, and a male die is horizontally arranged above the two support plates. The clamping part comprises a clamping frame and a sliding rod frame. The clamping frame is vertically fixedly arranged, the sliding rod frame is vertically and slidingly arranged on the upper part of the inside of the clamping frame, and a plurality of elastic frames are transversely and horizontally arranged on the bottom horizontal surface of the sliding rod frame. When extrusion is carried out, the elastic frames are deformed to match the outer wall modeling structure of the special-shaped metal hook, the stability of the bottom surface of the sliding rod frame in extruding and clamping the outer wall of the special-shaped metal hook is ensured, displacement of the special-shaped metal hook during punching is avoided, and the punching precision of the special-shaped metal hook is ensured.

The utility model relates to the technical field of sliding barrels, and discloses an automatic telescopic device for a sliding barrel of a ship loader, which comprises an automatic telescopic device main body for the sliding barrel, a sliding barrel pipeline main body is fixedly connected below the automatic telescopic device main body for the sliding barrel, and a quick expansion type sliding barrel device is detachably arranged below the sliding barrel pipeline main body. A plurality of groups of rapid expansion type chute tube devices are arranged on the chute tube pipeline main body, rapid metal hooks are detachably arranged among the plurality of groups of rapid expansion type chute tube devices, four groups of hook grooves are formed in the peripheral surface of the chute tube pipeline main body, an upper frame is arranged above the rapid expansion type chute tube devices, and a lower frame is arranged below the rapid expansion type chute tube devices; when the device is used, the length of the chute barrel can be quickly adjusted through the design that the device can be quickly disassembled and expanded, and the device is matched with an automatic telescopic device body of the chute barrel to automatically contract, so that the device is adaptive to different working conditions and environments and has a good use prospect.

The utility model discloses a water supply pipeline connecting device, and relates to the technical field of pipeline connection, the water supply pipeline connecting device comprises a fixing sleeve, the two ends of the fixing sleeve are fixedly connected with connecting mechanisms used for connecting pipelines, and the surfaces of the two connecting mechanisms are rotatably connected with fixing mechanisms used for limiting the pipelines. Firstly, the limiting pipe is driven by the hand wheel to rotate in the opposite direction in the first step, the limiting pipe needs to be rotated by a certain angle, then the metal hook is separated from the groove for cutting the pipeline and the groove cut by the metal hook when the pipeline is inserted into the butt joint pipe, and at the moment, the pipeline can be pulled out of the butt joint pipe; and even though the quick-insertion type pipeline connecting device is scraped with the pipeline, the quick-insertion type pipeline connecting device is not easy to fall off like a barb structure, so that the metal hook can be repeatedly used, and the problems that the existing quick-insertion type pipeline connecting device is not easy to disassemble and is not beneficial to secondary utilization are solved.

The utility model discloses an elastic hanging type heat preservation and sound insulation floor slab and a connecting piece for blocking a sound bridge, the heat preservation and sound insulation floor slab comprises a ribbed fine aggregate concrete composite board, the connecting piece and a flexible heat preservation and sound insulation layer, and the flexible heat preservation and sound insulation layer is provided with a connecting piece mounting hole which is through up and down. One end of a connecting piece penetrates through the connecting piece mounting hole to be connected with a reinforcing rib in the ribbed fine aggregate concrete composite board, and the other end of the connecting piece penetrates through the connecting piece mounting hole to extend into and be fixed into the floor structural layer, so that the ribbed fine aggregate concrete composite board and the heat preservation and sound insulation layer are hung on the lower side of the floor structural layer through the connecting piece; the connecting piece is provided with a metal hook, and the metal hook is movably connected with the reinforcing rib, so that the sound-insulating vibration sound bridge is prevented from being impacted through the activity of the metal hook. The metal hook of the connecting piece is movably connected with the reinforcing rib, so that an acoustic bridge of impact sound is effectively blocked, and the sound insulation effect of the impact sound is achieved.

The utility model belongs to the field of medical instruments, and particularly relates to an in-vivo and in-vitro combined type catheter fixing device for preventing non-planned extubation, which comprises a base, a lower arc-shaped ring fixedly connected with the middle of the base, a convex block fixedly connected with the top of the lower arc-shaped ring, and two mirror-symmetrical metal hooks fixedly connected with the end part of the lower fixing ring. Through mutual cooperation of the base, the cover plate, the metal hook, the upper arc-shaped ring, the lower arc-shaped ring and other structures, the catheter can be effectively fixed in place, the situation that the catheter is disengaged from a puncture part due to accidental traction or general position motion of a patient is avoided, in addition, the soft cushion arranged on the bottom plane of the base can be attached to the skin of the patient, and the puncture effect is good. The rubber pad at the end part of the base is in contact with the edge of the puncture part, so that the compression of the base on the puncture part is avoided, the comfort of a patient during use is favorably improved, and the wearing compliance of the device is improved.

The invention relates to a card clothing (20) for a card (1), and to a card (1). The card clothing (20) has a working direction (16), a foundation (21) and a plurality of clothing tips (26). The clothing tips (26) are formed from U-shaped wire hooks (22) which are pierced through the foundation (21) at a penetration angle (α) and each have limbs (24) forming two clothing tips (26) and a back (23) connecting the two limbs (24). The backs (23) are at a right angle to the working direction (16). The backs (23) form a base plane (29) on a side of the foundation (21) lying opposite the clothing tips (26). The wire hooks (22) have a total height (a) perpendicular to the base plane (29), and the limbs (24) each have a free limb length (c) perpendicular to the base plane (29) protruding from an exit point (27) out of the foundation (21) to the clothing tip (26). The limbs (24) are bent counter to the working direction (16) by a knee angle (β) at a knee height (b) from the clothing tip (26) and perpendicular to the base plane (29). Furthermore, a setting line (28) running perpendicularly to the base line (29) and through the exit point (27) of the respective limb (24) is determined. The clothing tips (26) are arranged on the setting line (28) or by a tip offset (d) away from the setting line (28) in the working direction (16).

The air curtain fixing structure comprises an anti-rotation piece and a hanging lug, the anti-rotation piece comprises a main body part, two transition parts and two metal plate hook parts, the two transition parts are arranged on the two opposite longitudinal sides of the main body part, and the two metal plate hook parts are correspondingly arranged on the sides, away from the main body part, of the two transition parts; the hanging lug is of a strip-shaped panel structure, two metal plate hook grooves are formed in the hanging lug in a mirror image mode, each metal plate hook groove comprises an insertion section and a sliding section, and the distance between the two insertion sections is larger than the distance between the two sliding sections. After the two metal plate hook parts are correspondingly inserted into the two insertion sections, the transition parts slide in the direction away from the insertion sections along the corresponding sliding sections, so that the panel at the sliding sections stops the transition parts. The anti-rotation piece can be conveniently inserted into the hanging lug, and the risk that the anti-rotation piece is disengaged from the hanging lug is also avoided.