109results about How to "Reduce procurement costs" patented technology

This invention discloses one beehive mobile communication aviation control system, which comprises the following parts: automatic driver device to control aviation as set task control; earth control bench and beehive mobile communication system to set fly task and display aviation status; the said aviator has several planes with each set with automatic driver device to own one SIM card of mobile communication codes; the automatic driver and earth control bench realize double data communication linkage through earth base station and beehive mobile network.

When any observer receives an image of a scene having the same relative size, shape and location on the retina of each of his two eyes at any instant and the image of the scene has some component of horizontal motion in any direction, the image viewed is three dimensional. If the motion occurs, all scene-object points are spatially located in playback since all of the original ray angles between camera and scene points are reproduced for both eyes by the ray cross-overs at the scene image points. When successive frames are presented, the brain cognizes the motion in linking the frames by persistence of vision. For the brain to perceive an item as moving it must connect these frames, but because of intersecting rays coming from any spatial location in successive frames, the brain cannot connect the frames without also locating the points in space.

Provided is a wall-mounted fresh air processor. The wall-mounted fresh air processor comprises a fresh air processor box body, a fresh air controller, an air inlet pipe, an air inlet, an air inlet fan, a fresh air purification device, a heat exchanger, a fresh air supply opening, an air return opening, a return air filter, an exhaust fan, an exhaust outlet and an air exhaust pipe. The wall-mounted fresh air processor is characterized in that besides the fresh air supply opening, an adjacent room fresh air supply pipe can be further arranged, the air inlet pipe, the air inlet, the air inlet fan, the fresh air purification device, the heat exchanger, the fresh air supply opening and the adjacent room fresh air supply pipe are connected in sequence to form a fresh air duct, and the air return opening, the return air filter, the heat exchanger, the exhaust fan, the exhaust outlet and the air exhaust pipe are connected in sequence to form a return air duct. According to the wall-mounted fresh air processor, outdoor air is purified to form fresh air, the fresh air is conveyed to one room, the fresh air flows to the other room, and is mixed with polluted air, and finally the mixed air is exhausted through the wall-mounted fresh air processor; due to the fact that the same wall-mounted fresh air processor is shared by the two rooms, the wall-mounted fresh air processor is made full use of, and the user cost is reduced.

The invention relates to a gradient dyeing process of a zirconia denture. The process comprises the following steps: immersing the pre-sintered zirconia denture in a dyeing liquid, dyeing for 10s, sucking up residual liquid after the dyeing process, drying for 10-20 min; coating and coloring part of the dried zirconia denture by a porcelain applying pen to form a color transition effect with multiple layers; drying the colored zirconia denture for 10-20 min; and sintering and crystallizing at sintering temperature of 1480-1530 DEG C for 5 h to obtain the zirconia denture with gradient color. The gradient dyeing process of the zirconia denture provided by the invention has short immersion time, can improve the working efficiency and save the cost, does not need excessive usage of expensive dyeing paste to reach the gradient effect, and conducts direct glazing without polishing; and the process is simple, and prominent in effect.

The invention discloses a refrigeration system which comprises an indoor unit and an outdoor unit, wherein the indoor unit comprises a compressor, a first indoor heat exchanger and a second indoor heat exchanger; the outdoor unit comprises an outdoor heat exchanger; an exhaust port of the compressor is connected with one end of the outdoor heat exchanger; the other end of the outdoor heat exchanger is connected with one end of the first indoor heat exchanger; the other end of the first indoor heat exchanger is connected with a gas returning port of the compressor, so that a loop in an air conditioning mode is formed; the second indoor heat exchanger is lower than the outdoor heat exchanger; one end of the second indoor heat exchanger is connected with one end of the outdoor heat exchanger; and the other end of the outdoor heat exchanger is connected with the other end of the second indoor heat exchanger, so that a loop in a heat tube mode is formed. The invention further discloses a refrigeration method of the refrigeration system. The technical scheme meets cooling requirements at different temperatures of working conditions, the refrigeration efficiency is improved, and the purchase cost of equipment is reduced.

The invention relates to the field of photovoltaic power station module cleaning work, in particular to a photovoltaic cleaning robot transfer vehicle, which is mainly used for transferring photovoltaic cleaning robot equipment. Photovoltaic cleaning robot transfer vehicle, including the chassis, the walking wheels are installed under the chassis, the longitudinal beams are fixed on the left and right sides of the chassis, the folding chassis is installed on the longitudinal beams, and the self-propelled lifting mechanism is installed on the folding chassis. The self-propelled lifting mechanism is equipped with a slewing support, the slewing support is equipped with a turning mechanism, and the turning mechanism is equipped with a sliding tray. By adopting the present invention, the transfer of photovoltaic cleaning robots from one row of photovoltaic modules to another row of photovoltaic modules is realized, so that one cleaning robot can serve multiple rows of photovoltaic modules, the utilization efficiency of photovoltaic cleaning robots is improved, and the cost of cleaning robots is reduced. purchase cost.

The invention belongs to the technical field of production of cosmetics and particularly relates to a liquid-state cosmetic mixed process treatment system which comprises a tank body, a distillation module, a rotating module, a stirring module and an auxiliary material adding module, wherein the tank body is used for containing a liquid raw material to be stirred, stirring of a liquid cosmetic isrealized in the tank body, and the side wall of the tank body is provided with a feed port; the distillation module is used for producing distilled water required for the cosmetic and performing heating and thermal insulation on the tank body by utilizing hot steam; the rotating module is used for driving the stirring module to rotate by utilizing the high-pressure steam generated in production ofthe distilled water as power; the stirring module is positioned inside the tank body and is used for realizing stirring of the liquid cosmetic; and the auxiliary material adding module is mounted onthe stirring module and is used for adding auxiliary materials into the tank body by utilizing rotation of the stirring module. The system provided by the invention can utilize the high-pressure steamgenerated during distillation to realize stirring of the liquid cosmetic, so that the arrangement of a power source is omitted, and furthermore, self-supply of the distilled water is realized.

The invention relates to a data forwarding technology in the field of network communication, discloses a method and equipment for realizing VPN message forwarding, and solves the problems of low forwarding efficiency and high equipment hardware cost caused by the forwarding mode in a traditional technology that forwarding needs to be carried out through the searching of a VPN route. When forwarding strategy of a strategy route is configured, if the configured forwarding strategy states that a matched message is forwarded in an appointed VPN, the next hop or an outbound interface is appointed after the VPN is appointed, and the appointed next hop or outbound interface belongs to the former appointed VPN. When a forwarding table is created by a strategy route management module for the corresponding forwarding strategy, related forwarding information needs to be searched in the VPN to which the appointed next hop or outbound interface belongs, and the strategy route forwarding table is created according to the forwarding information. In the process of forwarding the message, if the message is matched with the matching strategy of the strategy route, the message is directly forwarded according to the created forwarding table, and the VPN forwarding table is not required to be searched according to destination addresses. The method and the equipment are suitable for data forwarding.

The invention provides a packing film for frozen beverages. The packing film comprises a composite film of a printing protective layer and a thermal sealing layer, the materials of the thermal sealing layer comprise PP and color master batch, wherein the color master batch accounts for 8 to 10 percent of total weight of the materials for the thermal sealing layer, and the PP accounts for 90 to 92 percent of total weight of the material for the thermal sealing layer. The invention also provides a method for preparing the packing film. The packing film as a product can reach the printing level and the using effect of the prior pearly-luster OPP, is superior to the effect of the pearly-luster OPP, has low cost, and more accords with the environmental protection requirement.

The invention discloses a brand-new method for regulating the voltage of a three-phase self-coupling transformer. The voltage regulation of the three-phase self-coupling transformer is realized through a variable-flux voltage regulating mode; a voltage regulating winding is in series connected to a tail end of a public winding, so that the self-coupling transformer can meet the voltage regulation needs of the three-phase self-coupling transformer through a three-phase integrated switch.

The invention relates to a clamp suitable for hoisting motor stators of different sizes. A thread on the outer edge of a lead screw below a lifting lug is provided with a rotation block in an engagement rotation manner. A lower connecting rod installing block is arranged at the lower end of the lead screw. The rotating block and the lower connecting rod installing block are provided with a plurality of telescopic connecting rods in the radial direction of the lead screw. A vertical clamping plate is arranged at the end portion of the outer side of each telescopic connecting rod. The outer edge of the part, between the rotating block and the lower connecting rod installing block, of the lead screw is sleeved with a spring. According to the clamp, an adjusting block rotates, an upper connecting rod installing block is pushed downwards and pushes the telescopic connecting rods, the clamping plate extends to the outer sides and clamps the inner edge of an iron core, and the clamping plate stably ejects the inner edge of the iron core. A rubber pad installed on the outer side end face of the clamping plate can adapt to hook face changes of different parts of the inner edge of the iron core, and therefore hoisting of iron cores of different sizes can be achieved, the work efficiency is greatly improved, and the purchasing cost is reduced for manufacturers.

The invention discloses a bipartite graph optimal matching method for material inventory balance under complex conditions. On the basis of the weight of the inventory relation among warehouses, an inventory grade configuration table, inventory material lists in the warehouses and material demand plan lists, weighing calculation is conducted according to the optimized bipartite graph optimal matching algorithm to obtain a certain material demand plan needs what inventory material data for matching, the optimal inventory material network relation graph is obtained, and then perfect matching of material inventory balance is achieved. By means of the method, large enterprises with warehouses distributed in many regions can reasonably dispatch and distribute inventory material resources, the problems about reasonable distribution and utilization of the existing inventory material resources are solved, the material demand purchasing cost is greatly reduced, and benefits of the enterprises are maximized.

The invention discloses a permanent magnet coupler for belt driving. The permanent magnet coupler comprises a conductor rotor, a permanent magnet rotor, a belt pulley, an input shaft sleeve and an output bearing block, wherein the permanent magnet rotor is fixed on an outer cylindrical surface of the input shaft sleeve; the belt pulley is fixed on an outer cylindrical surface of the output bearing block; and the output bearing block is fixedly connected with the conductor rotor, and supported on the outer cylindrical surface of the input shaft sleeve through a bearing. The permanent magnet coupler disclosed by the invention has a soft starting function, better damping performance, can increase the utilization rate of motor power and bear a greater load, and has a more compact structure and excellent axial rigidity.

The invention discloses a two-gear pure electric vehicle transmission gear shifting mechanism and a shifting mechanism method. During gear shifting, a motor on a motor worm assembly drives a worm of the motor worm assembly to rotate, and the worm is engaged with a turbine of a torsion shock absorber assembly; and the turbine rotates to drive a straight gear on the torsion shock absorber assembly to rotate, the straight gear is engaged with a shifting fork rod rack on a shifting fork assembly, a shifting fork rod is driven to move in the axial direction, and accordingly, a shifting fork is driven to move in the axial direction to achieve gear shifting. Compared with the prior art, a transmitting swing rod assembly is omitted, the purchase cost and the assembling cost are reduced, meanwhile,a power transmit chain during gear shifting is shortened, the power efficiency is higher compared with that of a traditional mechanism, dynamic response is quick, and gear shifting setback of a wholevehicle is reduced.

The invention discloses a processing method of a high-strength wear-resistant bucket lip of a large excavator. Testing steel for the bucket lip comprises the following chemical components by weight percent: 0.15-0.25% of C, 0.3-0.50% of Si, 1.30-1.60% of Mn, 0.15-0.20% of P, 0.10-0.15% of S, 0.15-0.20% of Al, 1.2-1.50% of Cr, 0.8-2.0% of Ni, 0.4-0.6% of Mo, 0.06-0.08% of Nb, 0.06-0.08% of V, 0.01-0.03% of Ti, and 0.01-0.003% of B. The method comprises the following steps: smelting, cogging, processing and reshaping, modulation treatment, physical and chemical analysis, defect detection and the like. The bucket lip produced by the method can meet the requirements of high strength and high tenacity of the bucket lip, and meanwhile has the characteristics of being good in abrasive resistance, impact resistance, weldability and the like.

The invention relates to the technical field of multimedia playing, and discloses a method for synchronously displaying multi-screen playing pictures. The problem that when multiple different devicesneed a picture to play simultaneously, due to the fact that hardware is different, time is consumed for communication between devices, and time consumed for rear-end image rendering is different, andaccurate synchronization of long-time played images cannot be achieved are solved. According to the method, synchronization is realized by adopting three stages: stage 1, rapid synchronization of playing progress of master and slave devices is realized by synchronizing playing reference time and a current image rendering clock, and pre-synchronization of playing pictures between the master and slave devices is preliminarily completed; stage 2, through frame picture accurate synchronization algorithm processing, the video frame picture synchronization problem caused by the difference between network communication time consumption and video frame rendering time consumption is solved, and accurate synchronization of pictures played by master and slave devices is achieved; and stage 3, throughcyclic timing accurate synchronization processing, the problem that system time cannot be accurately synchronized due to equipment hardware differences is solved, and accurate synchronization of pictures played for a long time is achieved.

The invention discloses a special container system for cold chain transportation. The system comprises a container, a transferring box and roller beds, wherein the roller beds are arranged in the length direction of the container, and the roller beds are connected to the container through hydraulic oil cylinders; a guide groove is formed in the lower part of the transferring box, and the transferring box is connected to the roller beds through the guide groove; a plurality of positioning nails are arranged in the container; and the container is connected to the transferring box through the positioning nails. According to the system, different products can be correspondingly stored in the transferring box; and moreover, the quantity of box bodies can be increased and decreased based on thequantity of goods, so that the use flexibility is improved; and meanwhile, a freezing machine on a transportation vehicle is capable of supplying frozen brine to decrease the temperature in the transferring box; the temperature of different box bodies can be independently controlled, so that products with different heat preserving demands can be conveniently transported; and the container can be manufactured by reconstructing a general container and is capable of loading the transferring box for cold chain transportation, and thus the equipment purchasing cost can be decreased.

The invention discloses an integrated wastewater hardness removal device and a treatment method thereof. The hardness removal device comprises a device body, and the device body comprises a pH adjusting area, a precipitation area I, an aeration area, a precipitation area II and a control module. During operation, the to-be-treated wastewater and the waste alkali liquor are pumped into the pH adjusting area separately, the water with the adjusted pH value flows into the precipitation area I, and the suspended solids and part of hardness in the wastewater are removed in the precipitation area I;the water treated in the precipitation area I is sent to the aeration area for carbon dioxide aeration, the water subjected to carbon dioxide waste gas aeration flows into the precipitation area II,the water meeting the requirements after the hardness removal in the precipitation area II enters a sewage biochemical treatment system, and the precipitates generated during the process are discharged through a sludge discharge pipe to a sludge treatment device for treatment. The device is a waste water hardness removal treatment measure with high efficiency and low operation cost, and is suitable for the hardness removal requirements of the industries, such as coal gasification waste water with high hardness and high suspended solids, etc.

The invention relates to a spanner, in particular to a multifunctional hydraulic spanner. The multifunctional hydraulic spanner comprises a work head assembly and a power head assembly. The work head assembly comprises a plurality of different work heads. The power head assembly is hinged to the work head assembly through power head assembly fixing rods, and the output end of the power head assembly is connected with a power adaptive device on the work head assembly. According to the spanner, the various work heads can be flexibly selected and matched to be used, rapid changing is achieved to meet various working conditions, and all bolt challenges are solved.

The invention relates to a preparing method of hyperdispersant and non-dyed polyurethane elastic fiber. According to the method, a diisocyanate compound and polytetramethylene ether glycol are added into a N,N-dimethylacetamide or N,N-dimethylformamide solvent according to the mole ratio being (1.6-2.2):1, and a prepolymer solution is prepared; the temperature is lowered to 8 DEG C to 10 DEG C while the stirring is carried out; a mixed amine solution is added, and a spinning stock solution with the viscosity being 3800 to 4500 poises and the solid content being 30 percent to 40 percent is obtained; the spinning stock solution is injected into color paste to prepare a premixed stock solution; the premixed stock solution and the spinning stock solution are subjected to multiage tackifying blending; then, flatting agents, lubrication debonding agents and yellowing-proof agents are added; the mixture is fully stirred, and a colored stock solution is prepared; the non-dyed polyurethane elastic fiber with the fiber number being 40D to 300D is prepared by a conventional method. The preparing method has the advantages that the hyperdispersant is prepared by the self, the uniformity and the stable dispersion of the color paste in the spinning stock solution are ensured, and the coloring process of multiage tackifying blending is adopted, so that the color paste can be uniformly, fast and stably dispersed in the spinning stock solution.

The invention provides a circular saw blade laser welding device, belongs to the technical field of welding, and solves the problem that an existing circular saw blade laser welding device is high inmanufacturing cost. The circular saw blade laser welding device comprises a rack and laser welding machine focusing heads, wherein a base body clamp for positioning a saw blade base body in the circular saw blade and a tool clamp for positioning a saw blade tool bit in the circular saw blade are mounted on the rack; the two groups of laser welding machine focusing heads are separately positioned at the two sides of the saw blade base body on the base body clamp; the two groups of laser welding machine focusing heads are connected with the rack through welding drive structures; and the two groups of laser welding machine focusing heads can weld one saw blade tool bit on the saw blade base body. The circular saw blade laser welding device adopts two laser welding machines to simultaneously weld joints between the saw blade tool bits of the laser welding machines and the saw blade base body, so that power of single laser welding machine can be reduced, and purchasing cost of the laser welding machines is reduced.

The invention discloses an online commodity bargaining method and an online commodity bargaining system. The online commodity bargaining method comprises the steps of: receiving a commodity sale price transmitted by at least one seller; receiving a commodity purchase price transmitted by at least one purchaser; storing and publishing the commodity sale price and the commodity purchase price; comparing the commodity sale price and the commodity purchase price, and judging whether the same commodity sale price and commodity purchase price exist or not; if the same commodity sale price and commodity purchase price do not exist, then receiving the commodity sale price modified by the seller and the commodity purchase price modified by the purchaser and publishing them instantly; if the same commodity sale price and commodity purchase price exist, determining the same commodity sale price and commodity purchase price as a commodity transaction price, declaring that the bargaining is successful, and publishing and storing the commodity transaction price. By adopting the online commodity bargaining method and the online commodity bargaining system, the one-to-one negotiation between a purchaser and a seller in a traditional online transaction is converted to competition between purchasers or between sellers, thereby a formation of a price alliance can be suppressed effectively.

The invention provides a magnetic resonance imaging device for heads and necks. The magnetic resonance imaging device comprises a magnet, a patient support device and a scanning control system, a radio-frequency field emitting/receiving coil layer is integrated at an outer circle of the magnet, and a gradient-field coil field and a magnetic superconducting coil layer are arranged at an outer circle of the radio-frequency field emitting/receiving coil in sequence. The invention further provides a magnetic resonance system. By the aid of the magnetic resonance imaging device for the heads and the necks and the magnetic resonance system, patients can be in a comfortable treating state, purchase cost of hospitals is saved largely, and resource utilization rate is improved.

The invention provides an access control method, system and equipment, and a storage medium. The method comprises the steps: triggering an opening request of access control equipment when a distance between terminal equipment and the access control equipment is smaller than a first preset threshold value; collecting user face information by the terminal equipment; and when the user face information is matched with face information of an authorized user in a preset user library of the access control equipment, starting the access control equipment. In the invention, a terminal equipment camerais called to acquire the face information to replace a special face recognition camera on the access control equipment so that purchase cost and maintenance cost of the access control equipment for realizing a face recognition control function are reduced.

The invention discloses a preparation method for producing a garden flower and tree matrix fertilizer by utilizing antibiotic fungi residues. The method comprises the following steps: 1) mixed material alkalization: mixing the antibiotic fungi residues, mushroom residue ashes and chaff brans according to a proportion of (7-4):(2-1):(2-1.5), adding quick lime to adjust the pH value of the mixture to above 9, and carrying out stacking; (2) fermentation: carrying out primary fermentation and secondary fermentation ageing; and 3) carrying out sieving and packaging or granulation on the fermented finished product to obtain the garden flower and tree matrix fertilizer. According to the preparation method, the characteristics that the antibiotic fungi residues are instable and decompose easily are utilized, the mushroom residue ashes, the pH value of which is above 12, and the quick lime are added into the antibiotic fungi residues to adjust the pH value of the antibiotic fungi residues above9, and after fermentation, the residual antibiotic in the antibiotic fungi residues is effectively degraded; and meanwhile, the mushroom residue ashes are high in P and K contents and the antibioticfungi residues are high in N content, so that the content of nutrients of the organic fertilizer produced by mixing the mushroom residue ashes and the antibiotic fungi residues is remarkably higher than that of common organic fertilizers, and the nutrients are comprehensive.

The invention relates to a method for testing the maximum power point tracing algorithm performance of a solar photovoltaic power generation system. The method comprises the steps: converting a duty ratio of a pulse width modulation signal output by a measured algorithm in direct proportion into a PWM signal conversion unit of a direct current voltage signal UPWM; transferring and executing the measured algorithm by a control unit, collecting UC and UV and transferring the UC and UV to a tested maximum power point tracing algorithm, wherein the PWM signal duty ratio is adjusted by the algorithm; outputting the PWM signal to the PWM signal conversion unit through a driving circuit and changing the UV by adjusting the magnification time of the voltage signal conversion unit; and detecting a duty ratio numerical value by the control unit once the duty ratio of the PWM signal is adjusted stable by using the measured algorithm so as to obtain the tracking precision of the maximum power point tracing algorithm, and recording the time duration when the duty ratio output by the measured algorithm is stable again after the KV numerical value is changed. According to the method provided by the invention, the equipment purchasing cost for implementing test by adopting a program-controlled power supply is lowered, the development cost of a photovoltaic power generation system is lowered and the time of the photovoltaic power generation system is shortened.

The invention discloses high-efficiency bridge equipment which comprises a base frame and rope winding components uniformly distributed on the end surface at the top of the base frame; vertical arms are fixedly mounted at the bottom of the base frame; an universal wheel is mounted at the bottom of each of the vertical arms in a rolling manner; a driving cavity stretching towards the front side is arranged in the base frame at the position below each of the rope winding components; a first hollow cavity stretching in the left-right direction is formed in the rear side of each of the driving cavities in a communicating manner; a second hollow cavity is formed in the base frame at the position on the front side of each of the first hollow cavities; a partition plate is arranged between each of the first hollow cavities and the corresponding second hollow cavity; a guide and transfer groove is formed in the inner top of the front side of each of the first hollow cavities; and a first sliding frame extending downwards is arranged in each of the guide and transfer grooves. The high-efficiency bridge equipment has the benefits as follows: the structure is simple, the installation of a plurality of rope drums can be realized, each of the rope drums does not need to be replaced with a new one after the completion of rope winding, both time and labor are saved, and the efficiency is improved; besides, a driving device does not need to be additionally arranged, so that the manufacturing cost is reduced, and the enterprise procurement cost is further reduced.

The invention discloses a valve part locking device which comprises an adjusting rod and a locking base. One end of the adjusting rod and an operation shaft pin of a valve part are detachably connected. The adjusting rod can drive the operation shaft pin to rotate. The locking base is used for selectively limiting rotation of the adjusting rod. According to the valve part locking device, the adjusting rod and the operation shaft pin of the valve part are detachably connected, the valve part and the valve part locking device are arranged and installed separately, the manner is different from the manner of fixedly connecting the valve part and the valve part locking device in a unified manner before the valve part leaves the factory in the prior art, the valve part locking device can be additionally arranged on the basis of an original valve part according to the actual need of ships and the site requirement of ship survey of ship owners, the purchasing cost is saved, and the goods supply period is shortened greatly.

This invention relates to a method for in situ generating aluminum ions by aluminum amalgam liquid electrode for wastewater treatment. The method comprises: (1) preparing aluminum amalgam; (2) applying a DC power, and placing aluminum amalgam into wastewater to replace cations in the wastewater to form aluminum ions. The obtained aluminum ions can be used as a flocculant or a phosphorus-removing agent. This invention can be used to reduce oxidative matters in wastewater, and overcomes the shortcomings of forming a compact oxidation film on aluminum surface faced by conventional aluminum electrode method, and has no need for any chemical reagent. Besides, this invention has no secondary pollution.

The invention belongs to the technical field of the Internet, and particularly relates to a purchasing mall suitable for a buyer market environment and a purchasing method thereof, and the purchasingmall comprises: a demand list which is used for collecting and displaying the demands of a purchaser; a label library which is used for storing labels, labeling and marking demand products published by the purchaser according to the stored labels, and labeling and marking supply products published by the supplier according to the stored labels; a transponder which is used for the supplier to respond to the demand published on the demand list by the purchaser, is also used for the supplier to ask the purchaser for the demand questions and the purchaser to answer the demand questions, is also used for limiting the suppliers to carry out unified response according to formats required by the purchasers, so as to enable the purchasers to carry out horizontal comparison on responses from different suppliers to select an optimal response, and is used for feeding a selection result of the purchaser back to the supplier. According to the invention, the purchasing efficiency is greatly improved,and the purchasing cost is reduced.