2568 results about "Air bubble" patented technology

A heat management system includes: a first flow passage in which a reserve tank is not provided; a second flow passage in which a reserve tank is provided; a switching device configured to switch between coupling and uncoupling of the first flow passage and the second flow passage to and from each other; and a control device configured to control the switching device. The control device is configured to, when predetermined coupling conditions are met, make the heat medium flow through the first flow passage and the second flow passage that have been coupled to each other by the switching device. When the control device determines that air bubbles exceeding the allowable volume are present in the heat medium, the coupling conditions switch from being unmet to being met.

The invention relates to the technical field of nanoimprint, in particular to a preparation device and method of an elastomer imprint head, and the device comprises a base, a silicon wafer, a silica gel pad, a metal positioning sheet, a quartz sheet and a top cover; the embossment of the silicon wafer is adjusted in vacuum to form a central convex surface of the embossing head, and the elastomer embossing head with a specific curvature is prepared by combining an ultraviolet curing process. The impressing head is attached from the center to the edge during impressing so as to discharge bubbles, the edge is separated preferentially during demolding so as to reduce demolding force, the impressing head is matched with a semiconductor stepping process, and the yield is increased to 98% or above. The method has the technical advantages that the method can be compatible with a stepping imprinting manufacturing process, flaws in an imprinting structure can be effectively reduced through a special contact and demolding mode, and the yield is increased.

The invention discloses a steel structure weld defect detection device and method.The steel structure weld defect detection device comprises a U-shaped base, a transmission roller, an L-shaped frame, an ultrasonic probe, a liquid spraying mechanism and a display device, the transmission roller is arranged on the U-shaped base and used for supporting and rotating a steel pipe, and the L-shaped frame fixes the ultrasonic probe so that the ultrasonic probe can make contact with the surface of a steel pipe weld for real-time detection; a liquid spraying mechanism uniformly sprays water-based foam liquid on the surface of the welding seam, an air spraying device blows air into air holes in the welding seam, so that air enters the foam liquid through the air holes to form stable air bubbles, and a cleaning mechanism wipes the residual foam liquid on the surface of the welding seam to ensure that the surface is clean and tidy; according to the method, high-precision detection of the welding seam of the steel pipe is achieved, the automation degree of operation is high, manual intervention is reduced, the detection efficiency and accuracy are improved, and the continuity of detection and follow-up evaluation work can be improved.

The invention relates to a method and system for monitoring the number and radius of bubbles in a sieve-plate tower, and the process is as follows: dividing two frequency bands of a bubble generation sound production area and a bubble breaking sound production area according to the frequency in an audible sound range [20-20,000] Hz; sound sensors are installed between the sieve-plate towers and / or in the middle of the height of a liquid layer, and sound signals of fluid in the towers in the driving process are collected; the collected sound signals are preprocessed; obtaining the dominant frequency of each sound wave pulsation in the sound signal by using a fast Fourier transform algorithm, determining whether the dominant frequency belongs to a bubble generation sound production area or a bubble breaking sound production area according to the frequency band in which the dominant frequency is located, and substituting the dominant frequency into a corresponding correlation formula to determine the radius of the bubble; and counting the number of pulse peaks in the bubble generation sound production area and the bubble breaking sound production area within the sample time, and respectively obtaining the generation number of bubbles and the breaking number of bubbles. And real-time monitoring of the number and size of bubbles in the sieve-plate tower in a driving state is realized.

The invention belongs to the technical field of biological liquid sample detection, and particularly relates to a liquid path system for sample suction quality detection and an anomaly detection process. A liquid path system for sample suction quality detection comprises a capacitance detection module, an injector, a pressure detection module, a cleaning valve, a cleaning pump, a degassing module and a water tank which are connected in sequence, and the capacitance detection module, the injector, the pressure detection module, the cleaning valve, the cleaning pump, the degassing module and the water tank are connected through pipelines. The method mainly solves the following problems: 1, the contradiction between the pressure monitoring range and the monitoring resolution; 2, when the sample is insufficient or bubbles are sucked, the difference between the suction pressure and the normal liquid suction pressure is small, so that misjudgment is easily caused; 3, misjudgment is easily caused by noise signal interference; 4, corresponding error monitoring mechanisms are lacked in other processes such as cleaning, sample adding and the like; and 5, monitoring is performed by excessively depending on a single mode, and the pressure is easily interfered in the testing process.

The invention relates to a concrete vibration monitoring method and system based on image recognition and three-dimensional point cloud, and the method comprises the following steps: obtaining an image of a concrete surface in a vibration process and three-dimensional point cloud data of the concrete surface, marking coarse aggregate and bubbles on the concrete surface, and obtaining an image sample data set; using the image sample data set to train a target detection algorithm, and identifying aggregate and bubbles in the image; counting the number of coarse aggregates and the number of bubbles in the image; extracting the z coordinate value of each point on the vibration surface from the point cloud data to obtain the elevation difference of the whole vibration surface; establishing respective correlation models of the aggregate quantity, the bubble quantity, the elevation difference and the strength, the porosity and the segregation index by utilizing a regression model; and evaluating whether the vibration effect is qualified or not according to a prediction result of the correlation model. Real-time monitoring can be achieved in the vibrating process, and comprehensive and accurate vibrating quality evaluation is achieved.

The invention relates to the technical field of hemispherical harmonic oscillator assembly, in particular to a welding method and device for an assembled hemispherical harmonic oscillator, and the device comprises a vibration welding platform and a clamping assembly located above the vibration welding platform; the vibration welding platform is used for bearing the sensitive base and providing a thermal field and a vibration field needed by welding, and the clamping assembly is used for clamping the center shaft and sending the center shaft into a center hole of the base. A heating unit and a composite vibration ultrasonic transducer are arranged in the platform, and the platform is configured to apply high-frequency vibration formed by superposition of vertical longitudinal waves and horizontal torsional waves to the base. The high-frequency vibration thixotropic effect is used for reducing the viscosity of the molten solder, the ultrasonic cavitation effect is used for forcibly discharging bubbles at the bottom of the blind hole, and the sound radiation pressure generated by the vibration standing wave field is used for driving the center shaft to achieve friction-free self-centering in the hole. According to the device, the problems of air bolt pseudo soldering and rigid assembly clamping stagnation in the traditional process are solved, and the assembly coaxiality and the connection strength of the harmonic oscillator are remarkably improved.

The invention discloses a vibrating production device for concrete prefabricated part machining, and relates to the technical field of concrete prefabricated parts, the vibrating production device comprises a vibrating mechanism and translation sliding blocks mounted on the two sides of the bottom of the vibrating mechanism, a formwork fixing mechanism is arranged at the bottom of the vibrating mechanism, and clamping sliding plates are arranged on the two sides of the formwork fixing mechanism; the vibrating mechanism comprises a vibrating sliding disc, a longitudinal threaded sleeve is fixedly installed on the top of the vibrating sliding disc, electric telescopic rods are fixedly installed on the periphery of the bottom of the vibrating sliding disc, a supporting chassis is fixedly installed at the bottoms of the electric telescopic rods, and connecting ropes are fixedly installed on the periphery of the bottom of the supporting chassis. When the lifting frequency of the light foam disc and the detection rod is reduced, it shows that bubbles in the concrete are discharged, at the moment, the vibrating rod can be pulled out for concrete vibrating in other areas, and the situation that the quality of the formed concrete is affected due to concrete segregation caused by excessive concrete vibrating is avoided.

The invention relates to the field of decorative films, in particular to an indented pattern color scraping decorative film and a preparation method thereof.The indented pattern color scraping decorative film comprises a skin feeling functional layer, a pattern developing layer, a supporting strengthening layer and a coloring strengthening layer, the skin feeling functional layer, the pattern developing layer and the supporting strengthening layer are composited into an integrated structure through hot pressing, and micron-sized air guide grooves are formed in the bonding faces of all the layers; the air guide grooves are arranged in parallel along the extending direction of the dimpled grains, the 60-degree glossiness of the surface of the decorative film is less than 3GU, the pencil hardness is greater than 1H, and the texture spacing difference between the outline edge of the dimpled grains and the printed pattern layer is 0.1-0.5 mm, so that the decorative film is endowed with excellent stereoscopic visual effect and physical property. The dimpled grain structure in the skin-touch functional layer is directly formed on the surface of the skin-touch coating, the problem of interlayer dislocation caused by traditional composite embossing is avoided, it is ensured that the dimpled grain outline is clear, the peeling strength between layers is high, bonding is tighter, and no bubble is left on the bonding face between the layers.

The invention relates to the field of PCB (printed circuit board) printing, in particular to a high-precision multi-layer lamination and alignment PCB printing process which comprises a substrate pretreatment stage, a substrate preassembly stage, a dynamic lamination stage and a finished product output stage, the dynamic lamination stage comprises preheating treatment and resonance impurity removal treatment, and the lamination stage is divided into multi-stage lamination. And air bubbles and resin between the laminated bodies are optimized in the second pressing stage. According to the method, the inner-layer core plate and the copper foil are pretreated, so that positioning of the multi-layer core plate is more accurate and detection is facilitated, meanwhile, nanoscale micropores are formed in the copper foil through a laser technology to improve the flowing property of subsequent resin, and in the pressing process, pre-pressing and multi-stage pressing are set to improve the pressing accuracy; and in the second-stage pressing process, the dispersion direction of internal bubbles and the flowing direction of resin are improved through an ultrasonic device, a radiation heating device, a magnetic field assisting device and the like, the alignment accuracy and the pressing precision of the plate are further improved, and the machining efficiency is guaranteed.

The invention discloses a coating and hot-pressing process of a PHA material, and belongs to the field of packaging material coating. The process comprises the following steps: tightly combining a molten PHA coating material with a base material through hot pressing; the PHA coating is further compacted through a hot press polish roller, and bubbles between the PHA coating and the base material are eliminated; then entering a cooling device, rapidly cooling through internal water circulation so as to cure the PHA coating, and meanwhile, spraying a trace amount of deionized water mist so as to prevent the base material from being dried and embrittled due to high temperature; entering a recrystallization zone, regulating and controlling the crystallinity of PHA, and balancing the mechanical property and degradation rate. The PHA can be well bonded with various base materials (such as paper, fabrics and films) in the hot pressing process, and an additional adhesive is not needed. Therefore, the technological process is simplified, and the cost is reduced. And the PHA can be uniformly coated on the surface of the base material through the hot pressing process to form a compact coating, so that the performance consistency of the product is ensured.

The utility model discloses a plastic water cooling head quick bubble removing structure which comprises a shell with a water inlet portion and a water outlet portion, a transduction cavity is formed in the shell, a plurality of partition plates are arranged in the transduction cavity in a staggered mode, one end of each partition plate is connected with the shell, a gap is formed between the other end of each partition plate and the shell to form a corner, and therefore a winding water flowing channel is formed. At least one first flow guide plate is arranged at the corner of the water flowing channel, the first flow guide plate divides the corner into at least two flow channels, the first flow guide plate is arranged at the corner of the water flowing channel to separate bubbles, and liquid continuously undergoes the flow dividing and cutting process in the flowing process, so that the bubbles are continuously divided and dispersed, and the bubbles are uniformly dispersed. The air bubbles cannot be gathered together and can flow out from the water outlet part, so that the air bubbles are removed, and the energy conversion effect is prevented from being influenced.

Disclosed is a dual slot die coater capable of discharging a coating solution through an outlet after removing air bubbles contained in the coating solution. The dual slot die coater according to the present disclosure includes a first air vent installed in the first manifold region and a second air vent installed in the second manifold region.

The invention discloses a method and a system for repairing freeze-thaw damage of power plant concrete. According to the invention, the combination of Portland cement and nano-silica in the repairing material enhances the compactness of concrete and reduces the number of capillary pores, and the silane coupling agent significantly improves the bonding strength between the repairing material and original concrete and ensures the long-term stability of a repairing layer; the alkali activator sodium hydroxide accelerates the hydration reaction of the cement, and improves the early strength and durability of the repair material; the antibacterial agent benzalkonium bromide effectively inhibits the growth of bacteria, prevents microorganisms from eroding the concrete, and prolongs the service life of the repair structure; the defoaming agent alkyl sulfate reduces bubbles in the repairing material and improves the compactness and impermeability of the concrete; tiny air bubbles are introduced into the air entraining agent polyethylene wax, so that the freezing resistance and the crack resistance of the concrete are enhanced, and the high efficiency and the reliability of a repair project in a complex environment are also ensured.

The invention relates to the technical field of image recognition, and discloses a glass fiber board production quality detection method and system, and the method comprises the steps: collecting a continuous infrared thermal image sequence through an infrared thermal imaging device; constructing a temperature difference image set; identifying a primitive region with an abnormal diffusion characteristic; further performing fitting enhancement and significance detection on the abnormal primitive region; and performing defect classification and quality judgment based on the regional feature vector. Compared with the prior art, the technical problems that in the prior art, high-precision parting judgment cannot be achieved under the conditions that the surface texture of a glass fiber board is complex, hot-pressing disturbance exists, particularly, hot diffusion behaviors of dry filaments, degumming and cavitation bubble defects are similar, and the false detection rate of a conventional algorithm is high are solved. Due to the fact that a multi-channel thermal diffusion consistency analysis mechanism and parallel discrimination logic based on feature vectors are introduced, infrared primitive anomaly enhancement detection and defect classification recognition under the complex background are achieved, and the accuracy of glass fiber board production quality detection is improved.

The invention provides a cleaning device for marinated food raw materials, and belongs to the technical field of marinated food processing.The cleaning device comprises a cleaning tank, a bubble generator arranged at the bottom of the cleaning tank, a conveying mesh belt used for moving the raw materials out of the cleaning tank and a spraying assembly arranged on the conveying mesh belt; a chain plate conveying belt is arranged below the material guide plate, a wave-shaped material plate is arranged below one end, far away from the material guide plate, of the chain plate conveying belt, through holes for air bubbles to pass through are formed in the wave-shaped material plate, and concave parts on the wave-shaped material plate are linearly arranged in the horizontal direction; and a rotating shaft is arranged in the concave part on the wave-shaped material plate. According to the device, it is guaranteed that raw materials are repeatedly turned over and cleaned in the concave portion of the wave-shaped material plate, the raw materials can pass through the concave portion of the wave-shaped material plate one by one to move forwards, the raw materials are in a dynamic cleaning state all the time, continuous cleaning blind areas are avoided, and the cleaning quality of the raw materials is improved.

The utility model provides a compressed air foam fire extinguishing device. The compressed air foam fire extinguishing device comprises a pressure container, a compressed air foam generating part, a driving unit and a foam release spray pipe assembly, wherein foam premixed liquid is preloaded in the pressure container; the compressed air foam generating part adopts a shunt damping principle; compressed air foam with a certain foaming multiple is formed in compressed air foam liquid released by the compressed air foam generating part based on the flow division damping principle, the particle size of water can be refined, the coverage area of the water can be increased, more heat can be absorbed, comburent can be efficiently cooled, the penetrating force is improved through the compressed air foam, and the heat efficiency is improved. And the flame retardant can rapidly permeate into comburent to prevent rapid chemical chain reaction in the combustion process.

The invention discloses low-carbon anti-crack concrete and a preparation method thereof, belongs to the technical field of concrete processing, and is used for solving the technical problem that the anti-crack performance and the mechanical performance of concrete in the prior art need to be further improved. The preparation method comprises the following steps: injecting a concrete precursor into a plastic test mold, putting the plastic test mold on a vibration table, and vibrating for 1-2 minutes, and curing to obtain the anti-crack concrete. The preparation method comprises the following steps: preparing modified composite fibers, modified epoxy resin and modified recycled coarse aggregate as reinforcing materials of concrete, preparing a concrete precursor together with recycled fine aggregate, fly ash, cement, a curing agent and an auxiliary additive, injecting the concrete precursor into a plastic test mold, vibrating to remove bubbles, and curing to obtain the anti-crack concrete. The anti-cracking performance of the concrete is improved, and the mechanical performance and the high-temperature resistance of the concrete are also improved.

The present invention relates to the field of ink jet printing technology. The cartridges, whose ink reservoir is in communication with the external environment through a venting hole, are subject to ink leakage when the external pressure changes significantly with respect to the external pressure after ink filling, in particular due to possible air bubbles trapped in the in the ink reservoir. The present invention provides a cartridge lid (15) with an expansion space (25) formed between an outer lid member (40) and an inner lid member (27). The expansion space (25) is in communication with external environment through the venting hole (17) and has an inlet (26) through which ink is able to flow into the expansion space (25). The present invention also provides a cartridge, an ink jet print head and an ink jet printer.

The invention discloses an anti-freezing and self-healing hydrogel electrolyte of a water-based zinc ion battery and a preparation method of the anti-freezing and self-healing hydrogel electrolyte, and belongs to the technical field of water-based zinc ion batteries. The method comprises the following steps: (1) mixing a functional material, an acrylic monomer, an initiator, a cross-linking agent and soluble iron (III) salt to obtain a first product; (2) degassing the first product to remove bubbles, and then carrying out polymerization reaction to obtain a second product; and (3) soaking the second product in a 2-10 mol / L electrolyte aqueous solution for treatment to obtain the anti-freezing and self-healing hydrogel electrolyte. The hydrogel electrolyte prepared by the invention has high ionic conductivity and adhesion, and has good anti-freezing and self-healing capabilities. And when applied to the aqueous zinc ion battery, the composite material shows an ultra-long cycle life, can stably supply power even in an extremely severe environment, and has certain research significance for promoting flexible electronic equipment and large-scale energy storage application.

A phacoemulsification system and a corresponding method are described. The system having a handpiece having a needle and a sleeve at a distal end to emulsify a lens of an eye; an irrigation module configured to supply irrigation fluid into the eye; an aspiration module configured for aspiring eye fluid; a priming cover for fitting over the distal end of the handpiece during a priming process; external pressure sensors coupled with the priming cover; one or more sensors for monitoring at least one of an irrigation pressure and an aspiration pressure; and a processor configured to operate in a priming process. The priming process includes operating the irrigation module to fill the irrigation channel with fluid and remove air bubbles. The one or more processors are configured for obtaining calibration pressure data from the external pressure sensors and for calibrating the sensors of the system.

The utility model discloses a mortar filling structure for an outer joint of a pipeline, and relates to the technical field of pipeline construction. The pipeline outer seam mortar filling structure comprises a wrapping tape arranged under an outer seam at the joint of two adjacent pipelines, the wrapping tape wraps the outer walls of the two adjacent pipelines through a fixing assembly, a vibrating rope is arranged between the outer seam and the wrapping tape, and the two ends of the vibrating rope are located outside the two ends of the wrapping tape respectively. According to the pipeline outer seam mortar filling structure provided by the embodiment of the invention, in the mortar pouring process, the effect of vibrating mortar in the outer seam is achieved by pulling the vibrating rope back and forth, bubbles in the mortar can be eliminated, the mortar pouring uniformity is improved, the bonding effect of the mortar can be improved, the compactness of the internal structure of the mortar is improved, and the mortar pouring quality is improved. The bearing capacity and the sealing effect are guaranteed, the solidification time of mortar can be shortened, and the construction efficiency is improved.

The invention discloses a touch display screen machining jig, and belongs to the technical field of touch display screen machining, the touch display screen machining jig comprises a base, a carrier plate is slidably arranged at the top of the base in the length direction, a placement groove is formed in the top of the carrier plate, and the front end of the placement groove is open. The carrying plate for placing the display screen is slidably arranged on the top of the base in the length direction, and the rubber pressing roller and the rubber roller are arranged at the two ends of the top of the carrying plate correspondingly; through a rotating mechanism composed of a shaft rod, an incomplete gear, a mounting groove, a rack, a hidden groove, a clockwork spring and a belt wheel assembly, a rubber pressing roller or a rubber roller in the advancing direction of a carrier plate can be controlled in a linkage mode to move downwards to make contact with the surface of a display screen and roll in the mode of being attached to the surface of the display screen, and dust removal is conducted on the surface of the display screen through the rubber roller; and bubbles can be extruded out after film pasting is conducted through the rubber pressing roller, the use functionality of the device is improved, operation and use are convenient, and practicability is higher.

The invention relates to the technical field of medicine production, in particular to a remote supervision and verification device for automatic medicine production, which comprises a mounting frame, a conveying assembly, a fixing plate and a pushing assembly, and is characterized in that the conveying assembly comprises a first belt conveyor and a second belt conveyor; a mounting table is arranged between the first belt conveyor and the second belt conveyor, a visual detection part is arranged at the top of the mounting table, a plurality of groups of trays are uniformly arranged on a belt of the first belt conveyor, the plurality of groups of fixing plates respectively correspond to the plurality of groups of trays, and shaking mechanisms are arranged between the fixing plates and the trays. The device has the advantages that tilting of the tray is beneficial to redistribution of liquid medicine in the soft bag, slow rotation enables the liquid medicine to slightly shake in the soft bag, floating and dissipation of bubbles in the liquid medicine are promoted, interference of the bubbles on a detection result is reduced, the detection result is more accurate, impurities in the liquid medicine can be fully mixed with the liquid medicine through shaking, and the detection accuracy is improved. Impurities are prevented from being clamped in gaps of the soft bags, and the possibility of missing detection is reduced.

The utility model discloses a concrete paving device with a height control function, and relates to the technical field of road cement and asphalt concrete paving. A concrete paving device with a height control function comprises a paving frame and a paving part, the paving frame comprises a right-angle carrying plate, paving surrounding plates are fixed to the two sides of the right-angle carrying plate, the paving part is installed between the two paving surrounding plates and comprises a paving module and a control module, and the control module controls the paving module to ascend and descend to control the concrete paving height. The paving module comprises a lifting seat located between the paving surrounding plates, a paving plate is arranged at the bottom of the lifting seat, and the end, deviating from the paving advancing direction, of the paving plate is obliquely arranged upwards. Through the arrangement of the paving piece and the like, the paving height of the paving device can be adjusted at any time in the use process, the use of the paver is not influenced, air bubbles and gaps in a paving layer can be effectively eliminated by the paver, and the compactness and the compression resistance of a road surface are improved.

The invention relates to the technical field of water-stable layer materials, in particular to a microcapsule self-repairing ardealite water-stable layer material and a preparation method and application thereof.The preparation method comprises the following steps that S1, ardealite, slag powder and a modified coagulant are mixed in a mixer, and a preliminary modified mixture is obtained; s2, adding double microcapsules into the primary modified mixture to obtain a secondary modified mixture; s3, adding deionized water into the modified mixture obtained in the step S2, and stirring and mixing to obtain a modified wet mixture; and S4, injecting the modified wet mixture into a mold, vibrating to remove bubbles, standing at room temperature, and demolding and curing for 25-28 days to obtain the microcapsule self-repairing phosphogypsum water-stable layer material. Through the synergistic effect of the double microcapsules and the modified coagulant, the integrated function of rapid coagulation, self-repairing and toughness enhancement is achieved, it is guaranteed that a strength framework is rapidly formed in a high-humidity environment, meanwhile, immediate repairing can be provided for micro-damage, and the toughness and crack resistance of the material are macroscopically improved.

The invention discloses a preparation method of a single-crack sensor, and relates to the technical field of crack strain sensors, and the method comprises the following steps: 1, carrying out fluorination treatment on a silicon wafer in a closed container for 3 h to obtain a hydrophobic surface; 2, mixing the PMDS main agent and the curing agent according to the mass ratio of 10: 1, and then stirring the mixture by using a centrifugal mixer until the mixture is uniform; after the mixture is uniform, putting the mixture into a vacuum chamber to eliminate bubbles; carrying out spin coating on the fluorinated silicon wafer at a speed of 150r / min for 60s, and drying in a drying oven at 80 DEG C for 2h to obtain a PDMS film; 3, cutting the PDMS film into long strips with the length of 30mm and the width of 7mm, and attaching a pre-designed metal mask structure to the central position of the PDMS; according to the invention, by controlling a single crack in the conductive layer, cracks are prevented from being generated at other positions, the SWCNT conductive network on the crack provides a stable conductive channel, and the prepared crack strain sensor has better stability while maintaining high sensitivity.

The invention relates to the technical field of ion chromatography detection, in particular to a high-pressure cam pump stable in conveying flow, which at least comprises a first pumping assembly, and the first pumping assembly comprises a pump head, a pump body, a plunger rod, a liquid inlet, a liquid outlet and a sealing assembly. A liquid inlet and outlet structure is improved, and a liquid outlet is formed in the tail end of a pump cavity, namely, the liquid outlet is formed in the contact position of the pump cavity and a sealing assembly, so that liquid is pumped out in a first-in first-out mode, namely, the sucked liquid is pumped out first, dissolved gas or air bubbles and the like in the liquid conveying process are removed in time, and the liquid conveying efficiency is improved. Meanwhile, the liquid outlet is formed in the position of the sealing assembly, bubbles accumulated for a long time at the position of the sealing assembly can be taken out in time when the liquid is pumped out, and after operation is carried out for a period of time, the conveying flow is stable and the precision is high; and compared with the situation of poor conveying flow precision, the improvement effect is remarkable.

The utility model discloses an improved water stop diaphragm water pump. The improved water stop diaphragm water pump comprises a connecting part, a first water stop valve body, a second water stop valve body and a pumping assembly which are fixedly connected in sequence, a water stop cavity is formed between the first water stop valve body and the connecting part, a water stop seat is arranged in the water stop cavity, the interior of the water stop seat is a communicating cavity communicating with the valve plate cavity, and a water stop diaphragm is arranged in the water stop cavity; the first water stop valve body is provided with a water stop channel and an exhaust channel which are communicated with the water inlet connector and the balance cavity. When the water level rises, the water inlet connector is communicated with the balance cavity through the water stop channel, the water pressure of the balance cavity rises, and therefore water leakage of the water stop base is avoided. Bubbles are discharged by arranging the exhaust channel, so that the pressure of the water stop valve plate on the water stop seat is conveniently increased; and the liquid can directly enter the water stop cavity through the water stop diaphragm via the communicating cavity, so that the pumping flow rate of the liquid can be increased.

A foam molding method includes: moving a screw backward to take air into a heating barrel through a nozzle part in a state in which a shut-off nozzle is opened, the shut-off nozzle that opens or closes the nozzle part for injecting the molten resin and is disposed on a heating barrel; closing the shut-off nozzle and moving the screw forward, to diffuse the air taken into the heating barrel, in the molten resin in the heating barrel; feeding the molten resin forward while dispersing the air as the air bubbles in the molten resin by moving the screw backward while rotating it in a state in which the shut-off nozzle is closed; and opening the shut-off nozzle, to inject the molten resin containing the dispersed air bubbles into the cavity.