31results about How to "Good tightness" patented technology

A backing welding flux used for single-side submerged arc welding method is used together with the copper board as a backing; is distributed on the copper board by a certain thickness, and is pressed, together with the copper board, on the nozzle back side of the steel plate to be welded to form a back side welding channel on the nozzle surface side while performing welding; wherein, the powder ratio is 3.0-10.0%. Using the backing welding flux can ensure the excellent tightness between the backing welding flux and the nozzle back side of the steel plate to be welded, and can obtain a welding channel with stable shape and appearance, and sound back side.

The invention discloses a predatory mite toxicity testing method which comprises the following steps: (1) keeping predatory mites at minus 20 DEG C for 5min so that the predatory mites are under a cold paralytic state, picking the predatory mites on a nylon screen above 300 meshes through a fine writing brush, fully soaking the nylon screen attached with the predatory mites in an agent to be tested and keeping for 5-10s; and then, lifting the nylon screen, placing on a piece of dry filter paper and absorbing residual solution; (2) opening an upper cover of a predatory mite toxicity testing device, putting the nylon screen with the predatory mites in the step 1 onto a mite supporting screen in the predatory mite toxicity testing device, covering the testing device, placing the device on a tray that contains water, breeding the tray in an artificial incubator, observing and recording death rate of the predatory mites after a period and calculating a toxicity testing result. The predatory mite toxicity testing method disclosed by the invention is simple and convenient to operate and is accurate and reliable in result.

The invention relates to the technical field of connection fastening pieces, in particular to a special connection fastening piece with a lubricating function. The special connection fastening piece comprises a cylindrical main body assembly connecting column; a cylindrical second assembly connecting column is arranged on the right side of the main body assembly connecting column; a cylindrical third assembly connecting column is arranged in the left front position of the main body assembly connecting column; the upper and lower end surfaces of the third assembly connecting column are positioned between the upper and lower end surfaces of the main body assembly connecting column; cylindrical lubricating assembly sealing grooves are symmetrically distributed on the upper and lower end surfaces, near the left side positions, of the main body assembly connecting column; and the lubricating assembly sealing groove on the upper end surface is peripherally and uniformly provided with cylindrical lubricating liquid input holes. The special connection fastening piece has the advantages of more convenience in assembly, better connecting tightness, capability of preferably assembling and connecting with mechanical equipment, meanwhile, capability of connecting multiple mechanical structures and more reliable assembly stability.

The invention relates to an experimental device for measuring an opening degree of a certain point of a rock fracture and calibrating an osmotic pressure value by utilizing a magnetic fluid. The experimental device comprises a bearing plate with a plurality of small holes on the periphery, a plurality of threaded non-magnetic steel rods, a non-magnetic pressurizing steel bar with holes at two ends, an angle measuring instrument with a universal rotating spherical hinge and arranged on the bearing plate, a pressurizing air cushion, a nitrogen cylinder, a transparent acrylic plate, a pressurizing pump, the magnetic fluid and an electromagnet. The pressurizing pump is used for pressing water into the cracks of a test rock sample and a rock-like transparent resin plate, the water pressure is continuously increased, so that the water flow impacts the magnet fluid adsorbed by the electromagnet until the water flow breaks through the magnetic fluid to produce leakage, and the magnetic fluid begins producing displacement, thereby obtaining the relation among the magnetic force, the crack opening degree, the osmotic pressure and the magnetic fluid viscosity. The experimental device disclosed by the invention cannot be interfered by the electromagnet, the flowing state of the magnetic fluid can be easily observed, the flowing of the concrete can be well simulated, the rock sample can reach visualization, and an effect can be easily observed.

The invention discloses a breeding method for a eurytopic and new corn species with good quality and high yield. Concretely, the corn strain 7239 and CML285 are hybridized, and seeds of S1 generation are obtained. After selfing of optimized strains, the corn strain gui 39722 is obtained. At the same time, after selfing of optimized strains of the corn strain Swan (late) C4, the corn strain guizhao 18421 is obtained. The Gui 39722 as a female parent and Guizhao 18421 as a male parent are hybridized, and the eurytopic and new corn species guidan 0810 with good quality and high yield is obtained. The breeding method is characterized in that the male parent and the female parent have good characters and high cooperation; the obtained guidan 0810 has high yield, strong resistance, good quality and wide adaptability; the obtained guidan 0810 is especially suitable for planting in the whole Guangxi, and also suitable for planting within certain realms of South China, Southwest China and some nations in Southeast Asia.

The invention provides vertical-strip blistering jacquard fabric. The vertical-strip blistering jacquard fabric comprises a fabric layer, wherein the fabric layer is composed of cotton and 75D terylene, the occupied mass ratio of the cotton is 50%, and the occupied mass ratio of the 75D terylene is 50%. Compared with the prior art, the vertical-strip blistering jacquard fabric has the advantages that due to the characteristics of the raw materials of the vertical-strip blistering jacquard fabric and a reasonable post-finishing process, the cloth cover blisters, the advantages of microbubbles,strong texture sense, stiffness and smoothness, good compactness and not easy deformation and the like are achieved, the application range is very extensive, and the vertical-strip blistering jacquardfabric is an ideal material of T-shirts, underwear, trousers, coats, jackets and the like.

The invention relates to a wrister used for medical rehabilitation. The wrister comprises a wrister main body, a locking rotary knob, fixing belts, pull ropes, lining cloth, a thumbstall and a fastening belt, wherein the wrister main body is semi-cylindrical and is fixedly sewn together with two side edges of the lining cloth; a tensioning system reinforcing area is fixedly arranged at the edge ofone side of the wrister main body, and the plurality of fixing belts are fixedly arranged on the tensioning system reinforcing area; a locking rotary knob reinforcing area is fixedly arranged at theedge of the other side of the wrister main body, the locking rotary knob is fixedly mounted in the middle part of the locking rotary knob reinforcing area, the thumbstall is arranged on the left sideor the right side of the upper part of the wrister main body, and the fastening belt is fixedly connected to the tail end of the thumbstall and winds and is fastened to the thumb. For the wrister usedfor medical rehabilitation, the stable fixing technology is adopted, the wearing is convenient, the tightness is moderate and adjustable, the use is safe and reliable, the thumb joint is effectivelyprotected, meanwhile, the wrist joint and other metacarpophalangeal joints also can be effectively protected, and thus the demands of patients are satisfied.

The invention discloses a material processing system. The material processing system comprises material conveying equipment and material grabbing equipment, wherein the material conveying equipment comprises a support component, a conveying belt, a power component, a magnetic component and an adjusting structure, the conveying belt is used for conveying materials, the power component is used for driving the conveying belt to rotate so as to convey the materials, the magnetic component is arranged below the conveying belt and is used for sucking the materials located on the conveying belt, andthe adjusting structure is matched with the power component so as to adjust the tightness of the conveying belt. According to the material processing system, the material conveying equipment and the material grabbing equipment are arranged, so that the materials can be quickly grabbed and then are conveyed, the material processing efficiency can be effectively improved in the process, and manpoweris saved; the materials cannot deflect, remain, slip or fall off in the process, so that quick conveying is realized, and the material processing efficiency is improved.

The invention relates to a copper and aluminum compound column wing radiator copper pipe expansion device and a pipe expansion method. The device comprises a pull rod; a pipe expansion cavity is formed in the pull rod; a pipe expansion device is arranged in the pipe expansion cavity; at least one pipe expansion hole communicating with the pipe expansion cavity is formed in the middle part of the pull rod; and steel balls matched with the pipe expansion device are mounted in the pipe expansion holes. The device is simple in structure, convenient to operate, reasonable in design of expansion tightness and free in adjustment of the pipe expansion quantity; an aluminum wing pipe cannot fall; the expansion is better, so that the heat dissipating quantity of a copper and aluminum compound columnwing radiator is greatly improved, and the service life is prolonged; the pipe wall of a copper pipe is a straight groove; and basically no wake space is formed in the pipe, so that the heat transferquality is improved.

The invention relates to an ankle protection device used for medical rehabilitation. The ankle protection device comprises an ankle protection device main body, a shoe tongue main body and a locking system, and further comprises splayed bandages, ankle clamp plates, a sock, cold compress and hot compress bags and a wedge-shaped pad, wherein the left side and the right side of the ankle protectiondevice main body are symmetric and wrap the lower part of the shank, the ankle, and the rear half parts of the instep and the foot sole of a wearer; two side edges of the lower end of the shoe tonguemain body are fixedly connected with the left and right edges of the lower end of the ankle protection device main body in a tight sewing manner; the locking system adopts a rotary knob type tightnessdegree adjusting system, the pressure is uniform, the put-on and take-off are convenient and rapid, and the fixing effect and comfort degree are extremely excellent. For the ankle protection device and a use method of the ankle protection device, the stable fixing technology is adopted, the side support is reinforced, the wearing is convenient, safe and reliable, the ankle protection device can adapt to ankle joint injuries of various degrees, especially for critical patients needing surgery, during the treatment and rehabilitation processes, the ankle joint can be well protected, in match with activity degree exercise and muscle training, the rehabilitation of the patients is promoted, and therefore, the ankle protection device is suitable for practical use.

The invention relates to the technical field of wastewater environment-friendly structures, and discloses a dual anti-seepage and anti-corrosion structure of a wastewater lifting device in order to solve the problem that in the prior art, a wastewater lifting device is poor in anti-seepage and anti-corrosion durability. The structure comprises an inner high-strength glass fiber layer (1), a firstmiddle layer (2), an inner structural layer (3), a second middle layer (4) and an outer high-strength glass fiber layer (5) which are arranged in sequence. On the basis of an existing double-layer storage tank, the high-strength glass fiber layer anti-corrosion and anti-seepage structures are additionally arranged on the inner wall and the outer wall of the storage tank at the same time, and the dual structure comprises the modified polytetrafluoroethylene resin coating and the high-strength glass fibers which are tightly combined; apart from strong bearing ability, the structure has high corrosion resistance, permeation resistance and durability to wastewater, so that the problems of poor anti-seepage effect and over-high manufacturing cost of an existing water pool and an upgraded form thereof are solved, and the structure with good anti-seepage and anti-corrosion effects is obtained.

A packaging bag for foods / food products comprises at least a front part and a back part, which are connected to one another in the two lateral edge regions over at least one side fold or at least one side seam in each case and between which a bag pocket is formed with an upper open end and a lower closed end, especially which is formed by the fact that the front part, at a lower fold or seam, is turned over toward the back onto the back part, wherein the entire packaging bag has a left and a right bag part, the two of which are connected together along an overlapping region extending between the lower and the upper end, wherein in the overlapping region or laterally adjacent to this, at least one weakening line is provided, at which the two bag parts can be separated from one another.

The invention relates to the field of chemical structure corrosion prevention. The invention aims to solve the problem that anticorrosive paint in the prior art lacks anticorrosive durability. The invention discloses a self-repairing anticorrosive coating for a waste gas recovery pipeline. The self-repairing anticorrosive coating is prepared from the following raw materials in parts by weight: 54to 60 parts of methyl siloxane modified epoxy resin latex solution, 6 to 10 parts of self-repairing slow release balls, 4 to 6 parts of plasticizer and 4 to 8 parts of filler, wherein the concentration of the methyl siloxane modified epoxy resin latex solution is 60-70 wt%; the self-repairing sustained-release sphere comprises a copolymer-mesoporous SiO2 shell and a self-repairing agent loaded inthe copolymer-mesoporous SiO2 shell. By introducing the self-repairing slow-release ball, the self-repairing agent is released from the self-repairing slow-release ball in time under the triggering condition to repair the base layer material of the anti-corrosion coating, so that the service life of the anti-corrosion coating is greatly prolonged, the anti-corrosion effect of the anti-corrosion coating is greatly improved, and the maintenance cost is remarkably reduced.

The invention provides a high-stability light emitting diode chip and a manufacturing method thereof, and belongs to the technical field of semiconductors. A first conduction hole extending to an N-type electrode and a second conduction hole extending to a P-type electrode are formed in an insulating layer of the chip, and welding spots comprise first welding spots and second welding spots. The first welding spots are located in the first conduction holes and on the surface of the insulating layer and electrically connected with the corresponding N-type electrodes, and the second welding spots are located in the second conduction holes and on the surface of the insulating layer and electrically connected with the corresponding P-type electrodes. The parts, located on the surface of the insulating layer, of the first welding spot and the second welding spot are each of a circular truncated cone structure, and the diameter of the cross section of each circular truncated cone structure is gradually decreased in the stacking direction of the chip. And a part of the protective layer of the chip is also coated on the side walls of the circular truncated cone structures of the first welding spot and the second welding spot. By adopting the light emitting diode chip, water vapor and other pollutants can be prevented from permeating between the protective layer and the side wall of the circular truncated cone structure, and the reliability of the light emitting diode chip is improved.

The invention discloses an engine fixing base. A shell is fixedly connected with a flange by using a long bolt; a flange mounting bolt hole is fixed in an engine by a mounting bolt hole; an air filter core is arranged in an inner cavity of the shell; and eight air inlets of the flange are communicated with an air outlet. The flange comprises an air outlet, a bolt mounting hole and air inlets. The flange is fixed on the engine by the bolt mounting hole when being mounted, so that the trouble work caused by the demand of adding a mounting bracket is avoided. When the air filter works, air enters the inner cavity of the shell through the eight air inlets of the flange and flows through the air filter core, and thus, the clean air enters the inner cavity of the air filter core and enters the engine via the air outlet.

The invention provides a pressure container hand hole device. The hand hole device comprises a top plate, a lining plate, a section hose, a manhole pressing plate, a bolt, a nut and a washer. The lower end of the bolt is fixedly connected with the top plate, the lower end of the section hose is connected with the top plate, the lining plate is arranged between the top plate and the section hose, the lining plate is connected with both the top plate and the section hose, and the section hose is welded to the wall of a pressure container. The pressure container hand hole device has the following beneficial effect that the hand hole device for the pressure container is good in sealing performance.

The invention discloses a magnetic type coupler, which comprises a coupler female end and a coupler male end inserted into the coupler female end in a matched mode, wherein a magnetic piece is arranged at the coupler female end, a metal piece is arranged at the coupler male end, and due to the fact that the metal piece does not have magnetism, the coupler male end does not adsorb surrounding scrapiron in the plugging process, the scrap iron can be effectively prevented from entering the coupler female end along with the coupler male end when the coupler male end is plugged, and the design hasthe advantages that when the coupler male end is inserted into the coupler female end, it is ensured that the magnetic piece and the metal piece can be quickly and magnetically connected, the matching and inserting tightness is good, and external scrap iron can be prevented from being brought into the coupler female end, so that the safe creepage distance between the poles of the coupler is kept,the safety is high, and the use performance is improved.

The present invention relates to highly efficient suction and compression rotating mechanisms, particularly the compression mechanism with piston blocks mounted on two axes and driven by a pair of matching gears in the field of compressors and vacuums or hydraulic system such as oil pump, hydraulic motor, hydraulic gearbox, specifically there is application that uses this mechanism to create one rotary motor with multi compression stages, force-generating stages and continuous fuel burning regime. The new rotary lobe structure in this invention provides a close contact between curved surfaces with the same radius, which is a “Surface -to-surface” contact, whith much better tightness than “line” contact.

The invention relates to a ceramic quick opening valve element. The ceramic quick opening valve element comprises a shell and a valve element rod arranged in the shell. The shell comprises a plastic valve element body, and a metal valve element sleeve with a connecting part. The plastic valve element body is sleeved with the metal valve element sleeve, and the metal valve element sleeve and the plastic valve element body are in interference fit. The invention further relates to a production process of the ceramic quick opening valve element. During production, the metal valve element sleeve is formed in advance, then the metal valve element sleeve is put in a mold, powering-on and heating are carried out, then melted plastic is injected, and the ceramic quick opening valve element is formed after solidification and cooling are completed.

The invention discloses a side-direction double-clamping-connection sectional material for an aluminum alloy geometric flower box. The side-direction double-clamping-connection sectional material is characterized by being in a long strip shape as a whole and comprising an upper plane body, a left elevation, a clamping groove with a downward opening, a middle elevation, a half bottom plane body anda clamping groove with a rightward opening, the end of the upper plane body and the left elevation are connected to each other, the middle elevation is located at a central longitudinal perpendicularplane under the upper plane body, the clamping groove with the downward opening is formed between the middle elevation and the left elevation, the end of the middle elevation and the half bottom plane body are connected to each other, the clamping groove with the rightward opening is formed between the half bottom plane body and the upper plane body, and is at the right side of the middle elevation and under the upper plane body. According to the invention, an oblique lateral vertical board of the aluminum alloy geometric flower box and the outer side of a trapezoidal vertical plane can be integrally fixedly clamped together, the limiting fastness is good, the tightness is good, slope lateral sliding and displacement can be effectively prevented, and the sectional material is easy to loadand unload.

The invention relates to a high-performance automobile support connecting piece. The high-performance automobile support connecting piece comprises a main-body-assembly connecting and supporting plate. The lower end of the main-body-assembly connecting and supporting plate is a horizontal plane. An integrally-formed fastening-assembly supporting and connecting plate which faces downward is arranged on the right side of the main-body-assembly connecting and supporting plate. The included angle between the lower end face of the main-body-assembly connecting and supporting plate and the lower endface of the fastening-assembly supporting and connecting plate is 140 degrees. A U-shaped first clamping assembly connecting groove with a rightward opening is formed in the center of the right sideof the fastening-assembly supporting and connecting plate, and a rectangular second clamping assembly connecting groove is formed in the left side of the main-body-assembly connecting and supporting plate. According to the high-performance automobile support connecting piece, the connecting stability can be guaranteed during use, the overall using performance of an automobile is more reliable, thesafety is higher during use, and the maintenance cost is reduced for later use.

The invention discloses a connecting device capable of reducing the noise of a fan. The connecting device comprises a noise reducing section, a shrinkage section, a rectifying section, an iron hoop and a soft connector; the noise reducing section is a square cylindrical column provided with a vertical noise absorbing plate and a transverse noise absorbing plate inside; the outer surface is produced as a shell by a steel plate; the inner surface is provided with rock wool; the rock wool is wrapped by glass wool cloth; one end is an air inlet, and the other end is connected with a shell at one end of the shrinkage section; the vertical noise absorbing plate and the transverse noise absorbing plate are perpendicular to each other to form a square frame; a rectangular plate formed by wrappingthe rock wool by the glass wool cloth is embedded in the square frame; the shrinkage section is a top-round and bottom-square cylinder; the rock wool is arranged on the inner surface, and is wrapped by the glass wool cloth; one end of the shell of the cylinder is welded with a shell of a noise reducing body, and the other end is welded with a shell of the rectifying section; the rectifying sectionis a cylindrical column; the rock wool is arranged on the inner surface, and is wrapped by the glass wool cloth; one end is connected with the shell of the shrinkage section, and the other end is connected with the soft connector by using the iron hoop; and the soft connector is connected with an inlet of the fan.

The invention relates to the technical field of bypass filter paper, and discloses nano bypass filter paper, which comprises base paper. The base paper comprises the following raw materials in parts by weight: 40-60 parts of alkali treated cotton linter pulp; 50 to 70 parts of hardwood pulp; 20 to 30 parts of fibrillated superfine fibers; 15 to 20 parts of borosilicate glass fibers; 5 to 15 parts of polyamide fibers; 10 to 20 parts of a nano carbon fiber polymer; and 5 to 10 parts of polypropylene carbonate. The main performance indexes of the bypass filter paper prepared by taking the raw materials according to the component proportion and adopting the following preparation method can reach that the filtering speed is smaller than or equal to 85 S, the water absorption height is larger than or equal to 155 mm, the stiffness is larger than or equal to 30 mN.m, the bursting strength is larger than or equal to 310 Kpa, and the water absorption capacity is larger than or equal to 330 g / m<2>. The nano bypass filter paper and the preparation method thereof have the beneficial effects that the tightness is good, the paper is compact, the strength is high, the water resistance is good, the service life is long, and the high requirements of production, processing and manufacturing of a filter element of a filter and the use of the filter paper can be met.

The invention discloses a reinforced-type wallboard mounting frame for a simple board room. The reinforced-type wallboard mounting frame comprises a supporting column main body and a limiting sleeve, wherein the supporting column main body is sleeved with the limiting sleeve. A plurality of connecting piece mounting cavities are formed between the limiting sleeve and the supporting column main body. Bayonets communicating with the connecting piece mounting cavities are formed in the side wall of the limiting sleeve. At the time of mounting, connecting pieces of one side of one wall board penetrate through a set of bayonets and then enter the mounting cavities, and move in the axial direction of the supporting column main body, and the connecting pieces slides into limiting parts to be compactly matched with the mounting cavities, so that the wallboard end is compactly matched with the supporting column main body through the limiting sleeve. The reinforced-type wallboard mounting frame for the simple board room is simple in structure and reasonable in design, rapid assembling of a wallboard and the mounting frame is easy, assembling is compact, firmness and airtightness are good, and the isolation effect can be effectively achieved.

The invention discloses a steel structure strip sticking mechanism and a sticking method. The method specifically comprises the steps that (1) steel structures are placed on a conveying mechanism on amachine frame to be conveyed; (2) a sponge unwinding mechanism is started, and a sponge roll is unwound; (3) sponge is sprayed through a spraying device; (4) the wetted sponge is stuck to grooves ofthe steel structures, the stuck sponge moves forward along with the steel structures, and the sponge is squeezed through a first squeeze roller; (5) an adhesive sticker is stripped off through an adhesive sticker stripping mechanism; (6) an adhesive layer of the adhesive sticker is attached and stuck to the side surfaces of the steel structures; (7) a cutting mechanism is started for cutting whena positioning device monitors that the sponge between the adjacent steel structures is in place; (8) the steel structures are squeezed through a pressing device; and (9) a positioning mechanism is reset through a reset mechanism.

The invention relates to the technical field of a connecting fastener, in particular to a special simple type lubricating connecting fastener. According to the technical scheme of the invention, the special simple type lubricating connecting fastener comprises a main body fixing connecting structure; the main body is shaped like a right-angled trapezoid; an integrally formed rectangular reinforcing connecting fixing assembling structure is arranged in the position below the inclined surface of the right side of the main body fixing connecting structure; the lower end face of the reinforcing connecting fixing assembling structure and the lower end face of the main body fixing connecting structure are superposed; an arc-shaped assembling positioning clamping connecting groove is formed in each of the front end and the back end of the connection position of the main body fixing connecting structure and the reinforcing connecting fixing assembling structure; and assembling positioning connecting columns are arranged at the lower ends of the main body fixing connecting structure and the reinforcing connecting fixing assembling structure. The special simple type lubricating connecting fastener has the following advantages: the special simple type lubricating connecting fastener is more convenient during assembling and higher in connecting tightness; the special simple type lubricating connecting fastener and mechanical equipment can be assembled and connected well; moreover, the special simple type lubricating connecting fastener can connect a plurality of mechanical structures and has more reliable stability during assembling.

The invention relates to the technical field of blow-down pumps, in particular to a special sealing type pump body fastening connector. According to the technical scheme adopted by the invention, thespecial sealing type pump body fastening connector comprises a cylindrical main body supporting connecting column, wherein the left side of the main body supporting connecting column is equipped witha first tight assembly connecting disc which is integrally formed; the right side of the first tight assembly connecting disc is equipped with a spherical structure; the sphere center of the first tight assembly connecting disc is arranged at the left side of the main body structure of the first tight assembly connecting disc; a cylindrical first reinforcing connecting column which is integrally formed is arranged on the left side end surface of the first tight assembly connecting disc; the center shaft of the first reinforcing connecting column is the same with the center shaft of the main body supporting connecting column; and the center position of the left side of the first reinforcing connecting column is equipped with a cylindrical assembly positioning connecting column which is integrally formed. The special sealing type pump body fastening connector has the advantages that: a plurality of tight assembly connecting disc structures are arranged on the main body structure, so thatintegral assembly connecting attachment strength of the blow-down pump is better; and moreover, the special sealing type pump body fastening connector is more convenient during assembly.

The invention discloses welding equipment convenient to disassemble and used for vibrating disk body production, and belongs to the technical field of vibrating disk machining. The welding equipment comprises an equipment main body. A fixed frame is arranged on the outer side of the equipment main body. The four corners of the inner top end of the fixed frame are provided with limit plates. A second filtering assembly is arranged on the tops of the limiting plates. A rubber cushion is arranged at the top of the second filtering assembly. Multiple sets of elastic pieces are uniformly arranged on the outer side of the rubber cushion. A first filtering assembly is arranged on the top of the rubber cushion. According to the welding equipment, by arranging a vibrating groove and a filtering net, when the equipment main body conducts spiral vibrating discharging on materials, part of the materials are subjected to vibrating screening through the filtering net, the screened materials fall into the vibrating groove and are subjected to rolling discharging along the inner wall of the vibrating groove, and therefore the materials can be screened while discharging is conducted, the material conveying effect of the welding equipment is better, and the usage rate is increased.