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24results about How to "Guaranteed delivery efficiency" patented technology
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Accurate material conveying structure in processing of special medical food
ActiveCN224589451UAchieve stable deliveryfast pack
The utility model discloses a kind of material accurate conveying structures in special medical food processing, including main support component, the bottom side of main support component is provided with bottom installation component, material conveying component is provided on main support component, the side of material conveying component is provided with several packing guide components, the side of material conveying component is located in packing guide component one side and is provided with auxiliary installation mechanism, auxiliary installation mechanism is provided with material shifting power component, the output end of material shifting power component is provided with material shifting component, the discharge end of material conveying component is provided with packing guide component.The utility model has the beneficial effects that, the material accurate conveying structure of the technical scheme is stronger in practicality, and structure design is ingenious, using this material accurate conveying structure, the stable conveying of material is realized, the material in conveying process is packed quickly at the same time, effectively guarantee the conveying efficiency of material, and simultaneously, the packing bag efficiency of material is also improved.
Owner:MASARAT MEDICAL (TAIZHOU) BIOTECHNOLOGY CO LTD
Spacecraft product assembly-oriented automated production material flow transfer system and method
The application provides an automatic production material flow transfer system and method for aerospace product assembly, which comprises a centralized feeding platform for manual clamping and scanning storage before feeding cabin sections and the like, a system for assisting in rapid positioning of cabin sections and brackets, a fire-related planar warehouse for storing fire-related materials such as engines, a non-fire-related stereoscopic warehouse for storing cabin sections such as electronic cabins and material boxes, an intelligent tool warehouse for storing tools and tooling, a workstation for temporarily buffering finished products at the exit area of a factory building, an AGV for transferring materials between workstations, a truss robot for the up-and-down loading workstations of a full missile, a ground rail robot for the up-and-down feeding of direct parts on a missile, and a central control module for material flow control. The application can realize the simultaneous operation of two production lines through the shared logistics route, centralized feeding platform, distributed material storage area and detection area, thereby saving site resources and reducing the investment in production line equipment.
Owner:SHANGHAI SPACE PRECISION MACHINERY RES INST
A vertical multistage stainless steel centrifugal pump
PendingCN122083018AImprove work efficiencyExtended service lifePump componentsRadial flow pumpsElectric machineryPhysics
This invention relates to the field of centrifugal pump technology, specifically disclosing a vertical multistage stainless steel centrifugal pump to solve the problems of how to avoid friction between the impeller and the cavity and poor sealing between multiple impellers; specifically, it includes: a centrifugal pump assembly; the centrifugal pump assembly includes a base, a centrifugal pump housing is installed on the top of the base, a connecting seat is fixed to the outer wall of the centrifugal pump housing, the connecting seat is connected to a motor base located above the centrifugal pump housing via a connecting part, and a motor body is installed on the top of the motor base; this invention abandons the cavity design of traditional vertical multistage stainless steel centrifugal pumps, solving the problems of excessive temperature and wear of the impeller body and inner tank due to friction, thereby improving the working efficiency and service life of the entire centrifugal pump assembly, and the setting of the sealing component can ensure the sealing of the adsorption chamber, thereby ensuring the negative pressure adsorption capacity of the impeller body, and thus ensuring the liquid delivery efficiency of the entire centrifugal pump assembly.
Owner:JIANGSU LIXIN PUMP IND GROUP CO LTD
A pulsed ablation device
ActiveCN121287282Bincrease flexibilityGuaranteed delivery efficiencySurgical instruments for heatingMedicineExAblate
The application relates to the technical field of medical devices, in particular to a pulse ablation device which comprises a handle, a first supporting rod, a second supporting rod, a first ablation electrode ring and a second ablation electrode ring; when a pulse ablation operation is performed, a circular ring-shaped pulse electric field is constructed by means of the circular ring-shaped first ablation electrode ring and the second ablation electrode ring, instead of a traditional single-orientation strip-shaped pulse electric field, and the pulse ablation device does not need to be rotated frequently. On the one hand, the first supporting rod can be moved along the axial direction of the first supporting rod to drive the second supporting rod, the first ablation electrode ring and the second ablation electrode ring to move along the axial direction of the first supporting rod. On the other hand, the first supporting rod can be plastically deformed to drive the first ablation electrode ring and the second ablation electrode ring to move synchronously and rotate synchronously at multiple angles, so that the ablation electrode rings can be closely attached to tissues at different positions, the transmission efficiency of ablation energy is guaranteed, and the flexibility of the operation is improved.
Owner:BEIJING BOXIN MEDICAL TECHNOLOGY CO LTD
A conveying apparatus for filling slurry processing
The utility model discloses a kind of conveying equipment for filling slurry processing, it is related to filling slurry field, including base, the base top is connected with feed cylinder, the feed cylinder top left side is connected with feed inlet, the feed cylinder bottom right side is connected with discharge port, the end of bevel gear two is connected with half rod one, and the end of feed cylinder away from hydraulic rod one is installed with motor, motor output end is connected with half rod two, the end of half rod one away from bevel gear two is rotatably connected with external block, and the end of half rod two away from motor is also connected with external block.This conveying equipment for filling slurry processing, cover discharge port to feed cylinder inject cleaning fluid, start hydraulic rod, make half rod one translation away from half rod two, then start two motors can drive two half rods reverse rotation, agitate cleaning fluid fully collide cylinder inner wall, finally drain through discharge port, effectively clean residual slurry, improve equipment cleaning efficiency.
Owner:HENAN ZHONGKUANG ENERGY CO LTD SONGXIAN SHISHUDI GOLD MINE
A hanging type idler device for a belt conveyor
The application belongs to the technical field of belt conveying equipment, and discloses a hanging type carrier roller device for a belt conveyor, which comprises a carrier roller frame, a carrier roller assembly and a sling, the carrier roller frame comprises a top beam, a first connecting beam connected to the top beam and a second connecting beam connected to the top beam, a hoisting position is arranged at the top of the top beam, the first connecting beam and the second connecting beam are both arranged at the bottom of the top beam and are spaced apart, one end of the carrier roller assembly is connected to the first connecting beam, the other end of the carrier roller assembly is connected to the second connecting beam, and one end of the sling is connected to the hoisting position. The stability of the carrier roller assembly is increased, the stable operation of the belt conveyor is ensured, the stability of the belt conveyor is increased, the production and manufacturing cost of the belt conveyor is reduced, the hanging type carrier roller device can be a single module, and the effect of facilitating the modular production of the belt conveyor is achieved.
Owner:LIBO HEAVY INDUSTRIES SCIENCE & TECHNOLOGY CO LTD
Sludge conveying anti-blocking device convenient to maintain
ActiveCN224603814Utransport impactImpact of zoning transportation within the conveying mechanism
The utility model discloses a sludge conveying anti -blocking device convenient to maintain, including soft mud conveying mechanism, hard mud smashing conveying mechanism, the hard mud smashing conveying mechanism welding installation in the outer wall input pipe orifice department of soft mud conveying mechanism, zoned conveying mechanism, the zoned conveying mechanism passes through screw installation in the upper end of soft mud conveying mechanism and hard mud smashing conveying mechanism, lift down -pressing smashing mechanism, lift down -pressing smashing mechanism installation connection in the upper end right side of zoned conveying mechanism, overhauling closed mechanism, overhauling closed mechanism installation in zoned conveying mechanism, and located the left side of lift down -pressing smashing mechanism, the soft mud and hard mud of zoned conveying in the utility model department can be corresponding to discharge to soft mud conveying mechanism and hard mud smashing conveying mechanism, and the zoned conveying avoids the influence of hard mud block to the conveying of soft mud when smashing, and effectively ensures the overall conveying efficiency.
Owner:秦皇岛澈源环保科技有限公司
Scraper conveyor for coal mine
PendingCN121929476AImplement active detectionlow running costSievingConveyorsDrive shaftElectric machinery
The invention discloses a scraper conveyor for a coal mine, and relates to the field of scraper conveyors, the scraper conveyor comprises a scraper conveyor body, a feeding box, a discharging port and a driving motor are mounted on the scraper conveyor body, a transmission shaft is mounted in the scraper conveyor body, and the driving motor is in transmission connection with the transmission shaft. A plurality of bottom plates are mounted on the bottom side of the scraper conveyor body in a sliding manner and are movably connected; the device further comprises a bottom plate flatness detection mechanism. It needs to be explained that when the scraper conveyor operates, the transverse sliding frame moves in a reciprocating mode to actively detect the bottom plates, if the deformation amplitude of the bottom sides of the bottom plates is too large, the switching spring pulls the switching support to move, then the multiple bottom plates are driven to move, one bottom plate is separated from a scraper conveyor body, and the bottom plates are separated from the scraper conveyor body. And the other bottom plate is moved to the bottom side of the scraper conveyer body, so that automatic switching of the bottom plates is realized, the scraper conveyer body can continuously operate, and the conveying efficiency is ensured.
Owner:SHANXI DOORE JINZE COAL MINE MASCH CO LTD
Flattening roller structure and multilayer laminating machine conveying mechanism
ActiveCN224118419Uavoid wrinklesGuaranteed delivery efficiencyFinal product manufactureWebs handlingMachineScrew thread
The utility model discloses a flattening roller structure and a multilayer laminating machine conveying mechanism, the flattening roller structure comprises a roller and a conveying belt wound on the roller, and the surface of the roller is provided with bidirectional threads. The two-way threads can drive the conveying belt in contact with the two-way threads to horizontally move towards the two sides, namely the conveying belt is flattened, wrinkles of the conveying belt are avoided, and conveying efficiency is guaranteed.
Owner:QINHUANGDAO SHENGCHENG AUTOMATION EQUIPMENT CO LTD
A novel targeted drug delivery system based on rose hip extracellular vesicles
ActiveCN121313557BReduce the risk of tumor recurrencePromote enrichmentOrganic active ingredientsPharmaceutical non-active ingredientsBiocompatibilityImmunogenicity
This invention relates to the fields of biomedical engineering and drug delivery technology, specifically disclosing a novel targeted drug delivery system based on rosehip extracellular vesicles, comprising: preparing rosehip-derived extracellular vesicles; preparing drug-loaded vesicles; and preparing targeted modified drug-loaded vesicles. This invention utilizes the specific downregulation of stem cell-related pathways by rosehip components, while simultaneously leveraging doxorubicin to kill conventional tumor cells, forming a complementary therapeutic mechanism to fundamentally reduce the risk of tumor recurrence. The phenylboronic acid group of DSPE-PEG-PBA specifically recognizes sialic acid overexpressed on the surface of tumor cells, significantly increasing drug accumulation in tumor tissues while reducing distribution in normal tissues. By leveraging the natural biocompatibility and low immunogenicity of RHNVs, combined with the long-circulating properties of the PEG chain, systemic toxicity is minimized while ensuring delivery efficiency, particularly reducing the cardiotoxicity and bone marrow suppression of doxorubicin.
Owner:DALIAN UNIV OF TECH
Medium pressure rotary valve
The utility model provides a kind of medium pressure type rotary valve, including valve body and impeller assembly, impeller assembly includes impeller blade and impeller shaft, impeller shaft rotates and is set through valve body, impeller blade is fixed on impeller shaft and is located in valve body, at least one set of annular gas path mechanism is equipped on valve body;Each set of annular gas path mechanism includes air inlet, gas outlet and gas pipe, gas pipe is set at valve body periphery, and one end is connected with air inlet, the other end is connected with gas outlet.The utility model structure design is reasonable, by the gas pipe of the two sides of valve body being communicated being designed on valve body, and gas pipe can be supplemented with gas, ensure that airflow, material can be smoothly moved in gas pipe, to effectively adjust the pressure in rotary valve, so that the internal pressure of valve body can effectively flow, avoid upward recoil, effectively guarantee the reliability and continuity of conveying, guarantee material conveying efficiency.
Owner:JIANGSU SHOUZHUO ENVIRONMENTAL PROTECTION EQUIP MFG CO LTD
Vibration feeding disc
ActiveCN224118113Uplay a guiding roleWill not reduce delivery volumeJigging conveyorsConveyor partsStructural engineeringMachine
Owner:TAIZHOU ANKUAI INTELLIGENT EQUIPMENT CO LTD
A water temperature control device for Litopenaeus vannamei aquaculture
This utility model discloses a water temperature control device for Litopenaeus vannamei (whiteleg shrimp) farming, comprising a heater and a cooler. Both the heater and cooler have inlet pipes mounted on their sides, connected by a T-junction. A delivery pump is mounted on the side of the T-junction, and a dispersion component for water dispersion is mounted on the side of the delivery pump furthest from the T-junction. This utility model's heater and cooler reliably provide cold and hot water, the delivery pump ensures efficient water delivery, the dispersion device effectively achieves uniform water dispersion, and the temperature monitoring and control system ensures precise water temperature control. This rational structural design improves the reliability and durability of the equipment, reduces equipment failures, lowers maintenance costs, extends the equipment's service life, and provides long-term stable water temperature control for Litopenaeus vannamei (whiteleg shrimp) farming.
Owner:TIANJIN JINSHUIZU AQUACULTURE CO LTD
Radiator fin conveying device
ActiveCN224185075Ureduce workloadIncrease productivityConveyorsControl devices for conveyorsElectric machineryParallel arrangement
The utility model discloses a radiator fin conveying device, and relates to the technical field of conveying devices, the radiator fin conveying device comprises a plurality of support columns, the plurality of support columns are arranged in two rows in parallel, the support columns in each row are connected through sliding seats, a plurality of first transmission columns are rotatably mounted on the two sliding seats, and a plurality of second transmission columns are rotatably mounted on the first transmission columns. Each first transmission column is provided with two first belt wheels and a rotating column, every two adjacent first transmission columns are connected through a belt, a double-shaft motor is installed at the conveying starting position and connected with the first transmission column at the starting position through a belt, and when fins are conveyed, the double-shaft motors are started, and the rotating columns are connected with the first transmission columns at the starting position through a belt. The double-shaft motor drives the first transmission columns to rotate through belt transmission, the adjacent first transmission columns can rotate synchronously through the belt transmission effect, the first transmission columns drive the rotating columns to rotate in the rotating process, the fins are conveyed in the conveying direction when the rotating columns rotate, the workload of workers is reduced, and the production efficiency is improved.
Owner:LIYANG HUACHUANG ENERGY EQUIPMENT CO LTD
Coal conveyor belt anti-deviation adjustment mechanism
ActiveCN224278683UReal-time automatic adjustmentresolve offsetConveyorsSupporting framesElectric machineDrive shaft
This utility model discloses a coal conveyor belt anti-deviation adjustment mechanism, relating to the field of coal conveyor belt deviation adjustment technology. The utility model includes a support frame, with two sets of supports symmetrically arranged. A first base, vertically and horizontally positioned, is shared between the two supports. Second bases are fixedly installed on both sides of the first base on the two supports. First conveying rollers, inclined and symmetrically distributed, are fixedly installed at both ends of the upper surfaces of the first and second bases. When the conveyor belt deviates due to external force and contacts a contact sensor on the side wall, the contact sensor sends an electrical signal to the drive motor. After the drive motor starts, it drives the worm gear, worm wheel, drive shaft, and first base to rotate, thereby causing the conveying rollers on the first and second bases to move the entire conveyor belt back to its normal trajectory. This allows for real-time automatic adjustment of the deviated belt without manual intervention, effectively solving the belt deviation problem.
Owner:SHANDONG SANHEKOU MINE CO LTD
Path quick correction method, device and electronic equipment for logistics conveying system
PendingCN122288061AMeet real-time requirementsReduce computing power usagePathPingLogistics management
This application relates to the field of logistics automation control and local path decision optimization technology, and provides a method, apparatus, and electronic device for rapid path correction in a logistics transportation system. The method includes: obtaining the first operating state of the next-hop node corresponding to the current node; if the first operating state is blocked, obtaining a list of candidate downstream nodes corresponding to the current node, wherein the list of candidate downstream nodes includes a capability index for each downstream node; based on the capability index of each downstream node, selecting the optimal next-hop node from the list of candidate downstream nodes; and determining the cargo turning direction based on the coordinates of the current node and the coordinates of the optimal next-hop node, so that the cargo enters the route of the optimal next-hop node based on the cargo turning direction. This achieves rapid correction of the cargo path.
Owner:SHANGHAI XINBA AUTOMATION TECH CO LTD
Electronic material die cutting device
PendingCN122071125Aavoid damageIntegrity guaranteedLamination ancillary operationsLaminationStructural engineeringMechanical engineering
According to the electronic material die cutting device, a bottom base material further comprises a base material layer and a release film layer attached to the front face of the base material layer, a die cutting unit comprises a die cutting base installed on a rack, a first die cutting roller and a second die cutting roller, and the first die cutting roller and the second die cutting roller are rotatably installed on the die cutting base; a reversing shaft installed on the machine frame is arranged on the upstream of the die cutting unit, the outer circumferential face, higher than the die cutting gap, of the reversing shaft makes sliding contact with the back face of the base material layer on the bottom base material, and at least one reversing assembly is arranged on the upstream of the reversing shaft. And the bottom base material which sequentially passes through the reversing gap between the reversing shaft and the reversing assembly and is provided with the upward release film layer moves downstream and sequentially penetrates through the die cutting gaps of the multiple die cutting units. According to the invention, the continuous and efficient code spraying operation is realized without being influenced by the drying time of the code spraying ink, the completeness of the code spraying pattern and the traceability of the product based on the code spraying are ensured, and the damage to the base material layer in the reversing process can be avoided.
Owner:KUNSHAN KERSEN SCI & TECH
Pre-blocking prevention early warning production hopper for pitch-based carbon fiber
The utility model relates to production hopper technical field especially, relates to a pitch base carbon fiber prevents early warning production hopper of blocking, including hopper main part, the support arm is fixedly installed on the hopper main part, the support arm one end is fixedly installed with drive motor, drive motor output end vertical fixed mounting has the rotating shaft, the rotating shaft rotation sets up in the hopper main part, be equipped with a plurality of scrapes in the hopper main part, a plurality of the scraper between the rotating shaft is connected through a plurality of connecting rods, a plurality of the connecting rod all present horizontal arrangement, a plurality of the scraper all with the inner wall sliding contact of hopper main part, the hopper main part lower extreme is connected with the discharge pipe. The utility model rotates through drive motor drive rotating shaft in the hopper main part, drives a plurality of scrapes connected by connecting rod and slides along the inner wall, and the scraper can directly destroy the material adhesion condition, always keeps the inside of hopper unobstructed, reduces the hidden danger of plugging from the source, guarantees material conveying efficiency and continuity.
Owner:SHANDONG YIDA NEW MATERIAL
Pulse ablation clamp device
ActiveCN121196713BIncrease movement speedImprove motor flexibilitySurgical instruments for heatingMedicineExAblate
This application relates to the field of medical device technology, and in particular to a pulse ablation clamping device, including a handle, a support tube, a first ablation clamp, a second ablation clamp, a flexible transmission assembly, and a drive assembly. One end of the support tube is fixedly mounted on the handle, and its interior communicates with the interior of the handle. The first ablation clamp is fixedly mounted on the end of the support tube away from the handle. The second ablation clamp is movable toward or away from the first ablation clamp on the end of the support tube away from the handle. Compared to existing pulse ablation clamping devices, the support tube can undergo plastic deformation, allowing the first and second ablation clamps to move synchronously and rotate synchronously at multiple angles more flexibly, adapting to the tissue orientation of different sites and improving surgical flexibility. The drive assembly can drive the second ablation clamp toward the first ablation clamp via the flexible transmission assembly. Compared to rigid transmission methods, it can transmit power in a non-linear transmission path.
Owner:BEIJING BOXIN MEDICAL TECHNOLOGY CO LTD
Inverted scraper conveyor for recycling lithium batteries
ActiveCN224090968Ureduce the chance of stickingreduce entryConveyorsLoading/unloadingChain linkLithium battery
The utility model discloses an inverted scraper conveyor for recycling lithium batteries. A plurality of scrapers are uniformly connected to the periphery of a transmission chain; the guide plate is located in the shell assembly, fixedly connected with a lower side bottom plate of the shell assembly through a lower side support, in contact fit with the lower portion of the transmission chain located on the lower side and used for guiding the transmission chain. The baffle is located in the upper side space in the shell assembly and located in the area below the feeding port, the outer side end edge of the baffle is fixedly connected with a side end plate of the shell assembly, and the baffle is located on the upper portion of the transmission chain on the upper side and used for preventing falling materials from entering the transmission chain. The filling port and the extraction port are formed in a side end plate of the shell assembly in a spaced mode, an air inlet one-way valve is installed in the filling port, and an air outlet one-way valve is installed in the extraction port. The conveyor can meet the requirement for material conveying in the lithium battery recycling process, the probability of clamping stagnation can be remarkably reduced, the conveying efficiency can be remarkably improved, and the maintenance frequency can be effectively reduced.
Owner:江苏科中智能科技有限公司
Iron removal device
The present application relates to the technical field of coal mine, specifically relates to a kind of iron removal device, the iron removal device includes support assembly, iron removal component, level detector, camera and central controller, support assembly includes first support piece, first support piece is annular support piece, first support piece is equipped with slide rail, iron removal component includes iron remover and connecting component, one end of connecting component is connected with iron remover, the other end of connecting component is slidably connected with slide rail, the number of iron removal component is multiple, level detector is arranged on iron remover to detect the included angle between iron remover and horizontal line, camera is installed on support assembly to measure the size of the iron ware adsorbed by iron remover, central controller is connected with level detector, camera and iron removal component respectively, the position of iron removal component is adjusted according to the data transmitted in real time by level detector, camera, the present application proposes a kind of iron removal device, can automatically remove iron, ensure the conveying efficiency of conveyor.
Owner:ZHALAI NUOER COAL IND CO LTD
Single pipe fixing structure for reinforcing collapsible loess
ActiveCN224063393UGuaranteed delivery efficiencyImprove stabilitySoil preservationGear wheelClassical mechanics
The utility model relates to the technical field of single-pipe fixing structures, in particular to a single-pipe fixing structure for reinforcing collapsible loess, which comprises a shell, a drill bit, a central shaft, two limiting components, two gears and four fixing components, the drill bit is fixedly connected with the shell and positioned below the shell, the central shaft is arranged inside the shell, and the two limiting components are fixedly connected with the central shaft. The two limiting assemblies are arranged on the two sides of the center shaft respectively, the two gears are fixedly connected with the center shaft and located on the surface of the center shaft, the four fixing assemblies are arranged on the two sides of the gears respectively, each fixing assembly comprises a rack and a fixing rod, the racks are meshed with the gears, the fixing rods are fixedly connected with the racks and located on one sides of the racks, and the fixing rods are fixedly connected with the gears. And a round hole is formed in the side face of the shell and matched with the fixing rod, and through the arrangement of the structure, the problems that in the prior art, after the drill bit stretches into loess, the fixing effect of the drill bit and the loess is poor, and the conveying efficiency and the immersing effect of a solution are affected are solved.
Owner:CRCC DEV GRP CO LTD
Sliding block separating conveyor
ActiveCN224076331UEasy to adjustquick alignmentConveyorsConveyor partsControl engineeringControl theory
The utility model provides a slider separating conveyor which comprises a slider separating conveyor body and further comprises a position adjusting assembly arranged below the slider separating conveyor body, and the position adjusting assembly comprises a supporting plate, two sets of moving wheels, an adjusting structure, a bottom plate and a front-back adjusting structure. And the height adjusting assembly is arranged below the bottom plate and used for adjusting the height of the sliding block separation conveyor body. Through the arranged position adjusting assembly, the left-right position and the front-back position of the sliding block separating conveyor body can be conveniently adjusted, so that the sliding block separating conveyor body can be rapidly aligned with conveying belts on the two sides, and the conveying efficiency can be further guaranteed; and the height of the sliding block separation conveyor body can be rapidly adjusted, and the adaptability of equipment to different working conditions and conveying requirements can be enhanced.
Owner:JIANGSU XINJIULI INTELLIGENT TECH CO LTD
Coal powder crushing device for drying quartz sand
The utility model relates to a kind of pulverizing device technical field, specifically a kind of coal powder pulverizing device of drying quartz sand, including rack, two guide seats are fixedly connected on rack, slidingly connected with slide bar on guide seat, fixedly connected with guide shaft on slide bar, two connecting shafts are fixedly connected on rack, swing bar is rotatably connected on connecting shaft, swing bar is equipped with guide slot, guide shaft extends to the inside of adjacent guide slot and is slidably connected between swing bar, the same adjusting roller is rotatably connected between two swing bars, two winding rollers are rotatably connected on rack, the same conveying belt is wound on two winding rollers, and adjusting roller and conveying belt are in contact;When the conveying belt loosens, it can be quickly tensioned, so as to avoid the phenomenon of skidding in the process of winding roller driving conveying belt movement, ensure conveying efficiency, while reducing raw material waste, equipment wear and tear and other problems caused by skidding.
Owner:INNER MONGOLIA CHANGFAN QUARTZ SAND CO LTD