94results about How to "Increase vibration amplitude" patented technology

The invention discloses a heat exchanger with a protection function for biodiesel preparation, and relates to the technical field of heat exchangers, the heat exchanger comprises heat exchange equipment and further comprises a protection device, a control device is fixedly installed on the front side of the heat exchange equipment, a liquid inlet pipe is fixedly installed on the left side of the heat exchange equipment, and a placing frame is fixedly installed on the left side of the heat exchange equipment; wherein the protection device comprises a connecting pipe, an adjusting hole, an adjusting frame, an L-shaped rod, a protection groove, a rotating rod, a protection disc and a limiting groove, the L-shaped rod moves upwards to be separated from the adjusting hole and release limiting of the connecting pipe, and after limiting of the connecting pipe is released, the connecting pipe is manually pushed to move in the direction close to the oil storage tank for butt joint; and through the protection disc, loosening or displacement of the connecting pipe caused by the fact that an operator accidentally touches the L-shaped rod can be effectively prevented, and therefore the risk of leakage or accidents is reduced.

The invention discloses an electromagnetic rapping efficient deashing filter cartridge mechanism, which belongs to the technical field of filter cartridges, and comprises an inner skeleton, a filter layer sleeving the outer side of the inner skeleton, and a lower end cover fixed at the bottom of the inner skeleton, and the bottom end of the lower end cover is provided with an electromagnetic vibrator. The electromagnetic vibrator is mounted at the bottom of the lower end cover, so that the filter cartridge has a vibrating dust removal function, a transmission mechanical vibration mode is replaced, the service life of the filter cartridge is prolonged, the vibrating strength and frequency can be adjusted according to working requirements, the practicability is high, and the practicability is high. In cooperation with an elastic connecting mechanism composed of a damping spring, a damper, an outer rubber film, a fixing ring, an inner groove, an arc-shaped groove, a cylindrical rod and an inner rubber film between the mounting base and the upper end cover, in the vibration process, the filter cartridge can be controlled to vibrate up and down, meanwhile, the filter cartridge can be controlled to rotate in a reciprocating mode at a certain angle in the circumferential direction, the vibration amplitude is increased, and the vibration effect is improved. And the ash removal effect is better.

The utility model provides an MEMS piezoelectric sounder and a loudspeaker, first piezoelectric composite layers are symmetrically arranged at specified edge positions, a plurality of slotted structures are arranged in a specified area, a first diaphragm edge of a formed diaphragm structure is an anchoring edge, and an edge slotted structure is arranged at a non-anchoring edge. The internal stress of each diaphragm layer in the diaphragm structure caused by the process can be reduced by arranging the slotting structure, the flexibility of the diaphragm structure can be improved by covering the slotting structure with the flexible material, meanwhile, the sound leakage of the MEMS piezoelectric sounder at low frequency is reduced, the vibration amplitude and the emission sound pressure level of the MEMS piezoelectric sounder are improved, and the sound quality of the MEMS piezoelectric sounder is improved. According to the MEMS piezoelectric sounder, the flexible material with low density is adopted to replace a silicon vibrating diaphragm with large density, the mass of the vibrating diaphragm structure is reduced, the vibrating diaphragm structure of the rectangular bridge type structure can push out more air, the flexible material increases system damping, a sound pressure level SPL frequency response curve and a THD frequency response curve can be improved, and therefore the tone quality of the MEMS piezoelectric sounder is improved.

The utility model provides a piezoelectric MEMS sounding unit and a loudspeaker, each peripheral area of the upper surface of a substrate is provided with a first piezoelectric composite unit, the middle rectangular area of the substrate is provided with a slotted gap, the edge of each diaphragm of a formed diaphragm structure is anchored, a gap structure is arranged between every two adjacent first piezoelectric composite units, and the first piezoelectric composite units and the second piezoelectric composite units are arranged in the slotted gap. The internal stress of each diaphragm layer in the diaphragm structure of the piezoelectric MEMS sound production unit due to the process can be reduced by arranging the slotting gap; the flexible material is adopted to cover the slotting gap, the flexibility of the vibrating diaphragm structure can be improved, meanwhile, sound leakage of the piezoelectric MEMS sound production unit at low frequency is reduced, the vibration amplitude and the emission sound pressure level are improved, the flexible material with low density is adopted to replace a silicon vibrating diaphragm with high density, the quality of the vibrating diaphragm structure is reduced, and the cost is reduced. The flexible material reduces the quality factor Q of the resonance of the device, and is beneficial to improving a sound pressure level SPL frequency response curve and a THD frequency response curve, thereby improving the tone quality of the piezoelectric MEMS sound production unit.

The invention provides a method for designing an ultrasonic guided wave transducer for active corrosion prevention of a metal pipeline surface, which comprises the following steps of: S1, determining the modal and the frequency of ultrasonic guided waves needing to be excited by utilizing finite element numerical simulation, and calculating a frequency dispersion curve of the ultrasonic guided waves propagating in a pipeline by utilizing a semi-analytical finite element method, a specific mode needing to be excited is found through the frequency dispersion curve; s2, establishing an ultrasonic guided-wave transducer model, and performing sensitivity test on parameters of the Morris trajectory model to obtain structural parameters having great influence on the characteristics of the ultrasonic guided-wave transducer; and S3, simulating different conditions of the structural parameters with relatively large influence, and designing and manufacturing the transducer to obtain proper transducer parameters. Compared with an existing design method, the design method is simpler and more efficient, and the design of transducer structures applied to pipelines of different materials and sizes can be guided.

The invention relates to the technical field of household appliances, and discloses a rubber block for fixing refrigerant pipes, which is used for fixing a plurality of refrigerant pipes and comprises a rubber block main body and an expansion module. The rubber block main body is fixedly connected with a plurality of refrigerant pipes; the expansion module is arranged in the rubber block body and can extrude the rubber block body through expansion to adjust the structural rigidity of the rubber block body. The vibration frequency of the refrigerant pipe can avoid the frequency of the compressor, resonance between the refrigerant pipe and the compressor is avoided, the vibration amplitude of the refrigerant pipe can be effectively reduced, the stress risk of the whole pipeline system is reduced, and the whole stability of the pipeline system is improved. The invention further discloses a pipeline system.

The frequency modulation MEMS accelerometer comprises a resonator I and a resonator II which are in central symmetry, the resonator I and the resonator II are connected to a mass block in a bilateral symmetry mode, and each of the resonator I and the resonator II comprises an annular structure located in the middle. The middle annular structure is connected with a center anchor point located in the middle of the annular structure through four sets of first decoupling beams, the center anchor point is fixed to the substrate, the left side and the right side of the annular structure are each connected with a driving detection electrode, and the front side and the rear side of the annular structure are each connected with an electrostatic tuning electrode. The driving detection electrodes and the electrostatic tuning electrodes are variable-area comb teeth electrodes, the left side and the right side of each electrostatic tuning electrode are connected with the front end and the rear end of the displacement balance lever on the left side and the right side respectively, and the front end and the rear end of each displacement balance lever are connected with the L-shaped beams on the front side and the rear side through second decoupling beams respectively. According to the invention, the inherent frequency of the resonator can be accurately captured through self-oscillation, and the control precision is improved.

The invention relates to a crop combined seeder applying Beidou positioning and a working process. The crop combined seeder comprises a main rack and a rear rack hinged to the main rack, a main wheel set which actively moves forwards is arranged on the main rack; the rear rack is provided with a land wheel piece which moves forwards in a follow-up manner; a plough share assembly is arranged on the main frame; a front soil breaking assembly is arranged in front of the plough share assembly and used for breaking a surface soil layer; a seed box body assembly and a mud fertilizer assembly arranged on one side of the seed box body assembly are arranged on the main rack; the seed box body assembly is arranged behind the plough share assembly; the land wheel part is arranged behind the seed box body assembly; the device is reasonable in design, compact in structure and convenient to use.

According to the scheme, the efficient clean coal dewatering screen comprises a dewatering screen body, and the dewatering screen body comprises a mounting base and a mounting frame mounted at the top of the mounting base through a plurality of elastic assemblies; the driving assembly and the scraping structure are arranged and matched with the vibration motor body to increase the vibration amplitude of the sieve plate, so that the movement amplitude of clean coal on the surface of the sieve plate is improved, and when a reciprocating rod rotates, a scraping plate can be driven by a movable block and a connecting rod to reciprocate on the surface of the sieve plate, so that the clean coal on the surface of the sieve plate is scraped; according to the clean coal dewatering screen, it is further guaranteed that clean coal can fully move on the surface of the screen plate, so that the dewatering capacity of the clean coal dewatering screen is optimized, the more thorough dewatering effect and the higher dewatering efficiency are achieved, when the scraper moves on the surface of the screen plate, clean coal blocked in screen holes of the screen plate can be cleaned, and the good anti-blocking performance is achieved; and stable operation of the device is ensured.

The utility model discloses an electric toothbrush replacement head, which belongs to the technical field of electric toothbrushes and comprises a tail cover, a motor and a brush head body. The tail cover is provided with a fixing part, a limiting part connected with the fixing part and an inserting part connected with the limiting part, the other end of the inserting part is connected with a tail cover elastic wall, a connecting block is arranged between the tail cover elastic wall and the limiting part, and two grooves are formed in the end, close to the tail cover elastic wall, of the connecting block; a second elastic wall is arranged between the two grooves, a first elastic wall is arranged at the position, on the opposite side of the second elastic wall, of the limiting part, and an inserting groove is formed in the position, on the connecting block, of the inner side of the inserting part; two first limiting strips matched with the grooves are arranged in the brush head body. The replacement head of the electric toothbrush can solve the problems that toothpaste on the head of the toothbrush splashes before tooth brushing and foam splashes during tooth brushing.

The utility model belongs to the technical field of storage devices, and discloses a storage device for an accounting teaching simulation sand table, which comprises a shell, buckles symmetrically and rotatably arranged on the outer wall of the shell, a sealing cover positioned above the shell, a fixed plate, a plurality of sliding chutes symmetrically arranged on two sides of the fixed plate, a storage box slidably arranged on the inner wall of each sliding chute, and a storage box arranged on the outer wall of the fixed plate, cavities with different shapes are formed in the outer wall of the containing box. The transparent glass is installed on the outer wall of the shell and corresponds to the containing box; and the damping assembly comprises a supporting plate fixedly installed on the lower end face of the fixing plate, a second round rod and a plurality of first springs are fixedly installed on the lower end face of the supporting plate, third round rods are symmetrically installed on the outer wall of the second round rod, and limiting buckles abut against the outer walls of the third round rods. According to the utility model, the problem that the simulation sand table cannot be classified and stored is solved.

The utility model provides a continuous oil pipe injection bridge plug combined tool, and relates to the technical field of oil exploitation equipment. The continuous oil pipe injection bridge plug combined tool comprises an oil pipe connector, a hydraulic release, a centralizer, a positioner, a spray gun, a feeding and sealing tool and a bridge plug which are sequentially arranged. The positioner comprises a main body and a plurality of positioning parts, the multiple positioning parts are arranged on the circumferential side of the main body in a circumferential array mode along the axis of the main body, and the positioning parts are elastically connected with the main body; the positioning part comprises a first protrusion and a second protrusion which protrude in the direction opposite to the axis of the body, the first protrusion is close to the centralizer, the second protrusion is close to the spray gun, and the vertical distance from the end of the first protrusion to the axis is not larger than the vertical distance from the end of the second protrusion to the axis. The range defined by the multiple first protrusions can be larger than the inner diameter size of the sleeve. According to the technical scheme, hanging load fluctuation can be more obvious, and therefore accurate positioning can be achieved in the air-tight seal casing pipe.

The utility model discloses an impurity removal device for concentrated feed production, and particularly relates to the technical field of feed production, the impurity removal device comprises a filter box, a stirring box is arranged at the top of the filter box, a feeding pipe is arranged at the top of the stirring box, and a dust removal mechanism is arranged in the stirring box. The dust removal mechanism comprises a baffle arranged in the stirring box, a containing groove is formed in the surface of the baffle, a filter screen is arranged in the containing groove, a first air suction hopper is arranged on one side of the filter screen, an air suction pipe is arranged on one side of the first air suction hopper, and the cross section of the air suction pipe is in a T shape. Wherein a connecting pipe is arranged at one end of the air suction pipe. According to the feed filtering device, redundant impurities and mixed dust in feed can be removed, so that the using effect is greatly improved, the arc-shaped filtering plate can be conveniently cleaned, and blockage is prevented.

The utility model discloses an integrated intelligent variable frequency air conditioner special for a granary, and relates to the technical field of granary air conditioners. The air conditioner comprises an air conditioner body, a cleaning anti-blocking assembly and a vibration dust removal assembly, the front side of the air conditioner body is fixedly connected with a mounting frame, the front side of the mounting frame is fixedly connected with a filter screen, and the cleaning anti-blocking assembly comprises two electric push rods. Through the cleaning anti-blocking assembly, the electric push rod is used for driving the cleaning shell to move back and forth along the surface of the filter screen, the scraping piece is driven to swing to scrape dust accumulated on the surface of the filter screen, the dust blocking mechanism is matched to block and collect raised dust, secondary pollution is avoided, and the automatic cleaning function of the filter screen is achieved; the problem that a traditional filter screen needs to be frequently shut down for cleaning is solved, the manual maintenance frequency is reduced, smooth air inlet of the air conditioner body is guaranteed, heat exchange efficiency reduction and energy consumption increase caused by filter screen blockage are prevented, meanwhile, the reset mechanism enables the scraper to automatically reset through the elastic effect of the torsional spring, and it is guaranteed that scraping and sweeping actions are coherent and efficient.

The utility model relates to a mud and stone separator which comprises two walking tracks, an adjusting and separating mechanism is arranged on the tops of the walking tracks, the adjusting and separating mechanism comprises a reinforcing rack arranged between the two walking tracks, and an engine unit connected with the walking tracks is fixedly installed on the front face of the reinforcing rack. And a chain plate feeder is fixedly mounted at the top of the reinforcing rack. According to the mud and stone separator, mud and stone can be conveyed to the multiple sets of filter plates in the heavy screen box, the vibration amplitude and the vibration frequency of the heavy screen box are increased under the action of the vibration spring set, the screening efficiency can be improved, and large-size materials such as stone and gravel flow to the discharging belt on one side; small-size materials such as mud flow to the discharging belt on the other side, the angle of the discharging belt can be changed under the action of the pulleys and the supporting rods, the discharging belt can be suitable for different scenes, the adjusting flexibility is improved, and the walking crawler belt can be driven to move through the engine unit and the control motor.

The bar screen for the vibrating screen comprises a main frame, mounting plates are fixed to the left end and the right end of the outer wall of the main frame, limiting columns are vertically embedded into the front end, the rear end, the left end and the right end of the interior of the main frame, inner sliding blocks are embedded into the middles of the limiting columns, and return springs are embedded into the upper ends and the lower ends of the outer sides of the limiting columns. Supporting plates are fixed to the ends, close to the middle of the main frame, of the limiting columns, bar columns are embedded into the main frame, fixing plates are embedded into the front, rear, left and right ends of the upper portion of the inner wall of the main frame, limiting plates are fixed to the bottoms of the fixing plates, and limiting bolts are vertically embedded into the middles of the fixing plates. When the bar screen is installed on a vibrating screen, the vibration amplitude is larger, materials can rapidly move and roll over on the surface of the bar screen, the speed of passing through screen holes is increased, then the screening efficiency of the materials is improved, meanwhile, the bar columns can be rapidly replaced and overhauled, and use is more convenient.

The invention relates to the technical field of semiconductor technologies, in particular to an ultrasonic sensor based on an organic polymer structure and a preparation method thereof.The ultrasonic sensor comprises a substrate, a piezoelectric layer is formed on the front face of the substrate, a back cavity is formed in the substrate in a penetrating mode, an organic polymer layer is formed on the surface of the piezoelectric layer, and the Young modulus of the organic polymer layer is not higher than 2 GPa; a groove is formed in the organic polymer layer to form a horn for determining a sound wave field of view. The preparation method comprises the following steps: growing a piezoelectric layer on the front surface of a substrate; etching the piezoelectric layer; growing an organic polymer layer; etching the organic polymer layer and forming a horn; a back cavity is formed through the etching substrate. According to the invention, the organic polymer layer is grown on the piezoelectric layer, the resonant frequency is effectively reduced, on the basis, the organic polymer layer forms a horn capable of limiting a sound wave field of view, the equipment consistency is improved, the horn is formed while the organic polymer layer is etched, the sound pressure level of the horn is improved, process steps do not need to be added, and the yield is improved.

The invention belongs to the technical field of power transmission and transformation equipment fault diagnosis, and relates to a method for diagnosing looseness of a base connecting bolt of a combined electric appliance. And whether the base connecting bolt is loosened or not is judged by comparing the change of the proportion of the characteristic frequency amplitude in the full frequency band under different working conditions. According to the invention, whether the connecting bolt between the combined electric appliance and the supporting base is loosened or not can be accurately judged. The method is simple, convenient and rapid, has high accuracy, has no electrical connection with the equipment, and has no influence on the running state of the equipment.

The utility model discloses a kind of for wind power blade polishing device, it is related to polishing device technical field.The utility model includes placing table, and the placing table provides stable support base for integral equipment, further include polishing mechanism, and the polishing mechanism is set on placing table top.The utility model is through setting dust collection component, specifically in the process of rotating shaft rotation will be through driving gear to drive several driven gears to rotate together, in the process of several driven gears rotation will be through several impellers rotation to produce powerful airflow to make dust hood inside present negative pressure state, at this time dust generated in the process of polishing disc polishing is inhaled into dust hood inside, reduce dust height dispersion, and diffuse in the whole working environment, to reduce the influence to operator's vision, reduce working difficulty and risk, also reduce dust to spread to surrounding environment, reduce the influence to surrounding environment.

The utility model relates to the technical field of agilawood processing, and discloses an agilawood particle screening mechanism which is characterized in that two mounting plates are fixedly mounted in a shell, vibration enhancing pieces are uniformly and fixedly mounted on the mounting plates at equal intervals, and a screening plate is fixedly mounted at the other ends of the vibration enhancing pieces; blanking plates are fixedly mounted on the two mounting plates, and two upper-layer discharge ports and two lower-layer discharge ports are formed in the positions, on the two sides of the upper blanking plate and the two sides of the lower blanking plate, of the shell correspondingly; a driving motor is arranged on the shell, a ball screw is fixedly installed at the output end of the shaft portion of the driving motor, a movable frame is fixedly installed on the screw portion of the ball screw, and two driving plates are fixedly installed on the movable frame. And the continuous screening activity is guaranteed, the device is suitable for large-scale screening activity, the manual participation degree is lower, and the efficiency is higher.

The invention provides an engine hood lock mounting structure and a vehicle. The engine hood lock mounting structure comprises a hood lock mounting bracket and a reinforcing bracket which are arranged on a cabin upper cross beam at the front end of a vehicle body. The cabin upper cross beam is provided with a passing part for the engine hood lock to pass through, and the hood lock mounting bracket is connected to the rear side of the cabin upper cross beam corresponding to the passing part. The reinforcing support corresponds to the passing part and is connected to the front side of the cabin upper cross beam, an annular installation space is defined by the cover lock installation support, the reinforcing support and the cabin upper cross beam, and the engine cover lock is located in the installation space. According to the engine hood lock mounting structure, by arranging the hood lock mounting support and the reinforcing support, the annular hood lock mounting space can be formed among the hood lock mounting support, the reinforcing support and the front end upper cross beam, so that the engine hood lock mounting position is of a multi-connection structure to cooperatively bear force, and the mounting strength and rigidity of an engine hood lock are improved; the problem of shaking when the machine cover assembly is closed is solved.

The utility model belongs to the technical field of music auxiliary parts, and provides an Erhu high-frequency vibration bridge which comprises a shell and a vibration base. A vibration base is arranged at the bottom of the shell, a sound cavity is formed in the vibration base, a high-frequency vibrator is arranged in the sound cavity, and a vibrator shell is arranged at the rear end of the high-frequency vibrator; the vibrator shell extends backwards, a binding post protection shell is arranged at the rear end of an inner cavity of the vibrator shell, and a binding post is arranged at the rear end of the binding post protection shell; when vibration generated by the strings is conducted into the sound cavity, resonance is generated with the high-frequency vibrator, and the frequency of the piano sound and the vibration amplitude of the strings are increased. According to the scheme, the high-frequency vibration bridge can enable the Erhu to be in a completely-opened state within 5-10 days, so that the tone of the Erhu is full, the range is wide, and the tone of the Erhu is perfect and reaches a finished product qualified state; the problems that the sound of the erhu is slow and the unstarted sound of the erhu is sharp and narrow in range are solved.

The utility model relates to the technical field of vegetable grading, provide vegetable grading screening machine, including the organism, the bottom one side of organism is uniformly fixed with the discharge plate, one side of the organism is provided with the placing table, the top of placing table is uniformly provided with the collection frame, the below of the organism is provided with the support. The utility model discloses is provided with the dismantling structure, when the baffle is located in the direct below of the movable slot, the grading plate is placed on the top of support plate at this moment, and the baffle will pass through the inside of movable slot, rotates the handle again, makes the baffle and movable slot and dislocation, under the effect of antiskid pad, increase the friction between baffle and connecting plate, under the limiting effect of baffle, avoid the connecting plate and organism to separate, when reverse operation, the convenient grading plate of dismantling replacement, has realized the function that the device is convenient for replacement grading plate to improve the applicability of this vegetable grading screening machine when using.

The invention discloses a frequency modulation MEMS accelerometer based on a ring resonator, comprising two centrally symmetrical resonators I and II, wherein the resonators I and II are symmetrically connected to a mass block, and both the resonators I and II include a ring structure located in the middle, wherein the ring structure in the middle is connected to a central anchor point located in the middle of the ring structure through four groups of first decoupling beams, wherein the central anchor point is fixed on a substrate, wherein the left and right sides of the ring structure are respectively connected to a driving detection electrode, and the front and rear sides are respectively connected to an electrostatic tuning electrode, wherein the driving detection electrode and the electrostatic tuning electrode are both variable area comb teeth electrodes, and the left and right sides of each electrostatic tuning electrode are respectively connected to the front and rear ends of the displacement balance levers on the left and right sides, and the front and rear ends of each displacement balance lever are respectively connected to the L-shaped beams on the front and rear sides through second decoupling beams. The invention is conducive to the self-excited oscillation to accurately capture the natural frequency of the resonator and improve the control accuracy.

The invention relates to the technical field of building drainage, and discloses an anti-blocking hidden building drainage pipeline which comprises an embedded mounting box and an elastic pipeline arranged in the embedded mounting box, the top end of the elastic pipeline communicates with a water inlet connector, and the water inlet connector penetrates through the top wall of the embedded mounting box; a plurality of adjusting plates are arranged on the outer side of the elastic pipeline; when impurities block the interior of the elastic pipeline, the multiple adjusting plates can be driven to get close to one another through the adjusting assembly, so that the elastic pipeline is extruded, the inner diameter of the elastic pipeline is reduced, the impurities blocked in the elastic pipeline are compressed, and after compression is carried out for a period of time, the impurities in the elastic pipeline are removed. And then the multiple adjusting plates are driven by the adjusting assembly to be away from each other, so that the inner diameter of the elastic pipeline is increased, a gap is formed between the impurities and the inner wall of the elastic pipeline, then the impurities in the elastic pipeline can be discharged downwards under the action of water flow, and therefore the drainage pipeline is prevented from being blocked.

The invention discloses a production process for extracting dihydroquercetin by ultrasonic waves, which comprises the following steps: step 1, freezing: taking larch as a raw material, crushing the larch into 30-50 meshes, performing freezing and ice crystallization in an environment of-8 DEG C to-20 DEG C, and then dispersing the larch in an aqueous solution of 0-4 DEG C to obtain a feed liquid; 2, wall breaking: mechanically grinding the obtained feed liquid, uniformly mixing, and then carrying out instant ultrahigh pressure wall breaking by using a high-pressure homogenizer, so as to obtain a cell wall breaking material; according to the method, raw materials are soaked with 98% ethyl alcohol and then stirred at a high speed, plant cells of larch become soft and thin, and cell walls of larch generate stronger collapse and maximum rupture in a frequency conversion and cosine combined ultrasonic extraction mode, so that the yield of larch is increased, and the yield of larch is increased. The method ensures that the dihydroquercetin can be rapidly fused into an ethanol solution from plant cells, the yield of dihydroquercetin extraction is improved to the maximum extent, and the extraction rate of dihydroquercetin is 90% or above.

The energy-saving type anchor rod limiting device comprises a hollow limiting body, a rubber sleeve and a supporting plate, a plurality of through grooves are formed in the middle of the limiting body, the lower ends of the through grooves are inclined planes, and the inclined planes extend towards the lower portion of the outer side of the limiting body. A dustproof mechanism used for blocking drilling dust is arranged on the inner side of the limiting body. Compared with the prior art, the limiting device has the advantages that the overall length of the limiting body can be adjusted by adjusting the supporting plate at the upper end, the drilling depth can be controlled when the limiting body is arranged at the position of a bayonet device of the roof bolter in a sleeving mode, and therefore the roof bolter can conduct standard-depth drilling, energy saving of drilling construction of the roof bolter is achieved, and the drilling efficiency of the roof bolter is improved. And meanwhile, dust falling from a drill hole of the roof bolter is cleaned in time through the dustproof mechanism, the lower end of the limiting main body can be stably arranged on a bayonet device of the roof bolter in a sleeving mode, and stability is enhanced.

This invention discloses a super-linear loudspeaker and its manufacturing method, comprising a square bar-shaped loudspeaker body that cooperates with a display screen. The loudspeaker body includes a support frame, which includes a first-stage frame that cooperates with a sound-generating unit and a second-stage frame that cooperates with a magnetic circuit unit. The first-stage frame and the second-stage frame are arranged in a stepped manner. The magnetic circuit unit includes a magnetic cup and a magnet disposed within the magnetic cup. The sound-generating unit includes a diaphragm disposed at the top of the first-stage frame and a voice coil that drives the diaphragm to vibrate. A magnetic gap is formed between the magnet and the sidewall of the magnetic cup to cooperate with the voice coil. A main frame is disposed between the voice coil and the diaphragm. The top of the main frame is fixedly connected to the diaphragm, and the bottom of the main frame is fixedly connected to the voice coil. By optimizing the loudspeaker shape, adding a small diaphragm structure welded to the back of the FPC, and optimizing the magnetic circuit structure, the low frequency is better during sound generation, and the power consumption, distortion, and space occupation are smaller, resulting in higher loudness.

The invention belongs to the technical field of injection molding devices, and particularly relates to a fender injection molding device which comprises a machining platform, an injection molding machine is fixedly connected to the upper end of the machining platform, a lifting plate is arranged above the machining platform in a sliding mode, a fixed mold is fixedly connected to the lifting plate, and a movable mold is clamped to the fixed mold; the end, close to the injection molding machine, of the fixed mold is fixedly connected with a feeding hose communicating with the output end of the injection molding machine. And the adjustable vibration mechanism is arranged at the position, located below the lifting plate, of the machining platform and used for introducing vibration effects of different amplitudes in the injection molding process. By arranging the adjustable vibration mechanism, in the injection molding process of the fender, when molten plastic enters a thick or complex part, the vibration amplitude is increased, when the molten plastic enters a thin or simple part, the vibration amplitude is reduced, and the molten plastic is prevented from flowing too fast.